Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, and the battery device comprises a box body which is internally provided with a containing cavity and is provided with a bottom plate; the plurality of single batteries are arranged in the accommodating cavity, each single battery is provided with a pole, and the pole is arranged on one side, facing the bottom plate, of each single battery; the electric connecting sheets are connected with the pole columns of the battery monomers; and the reinforcing plate is fixed on the bottom plate, is positioned on one side, facing the plurality of battery monomers, of the bottom plate, and is fixedly connected with the electric connecting sheet. According to the battery device provided by the invention, the phenomenon of torsion fracture of the electric connecting sheets caused by different amplitudes of the plurality of battery monomers in the movement process can be effectively prevented; meanwhile, the stress concentration at the connecting position of the electric connecting piece and the pole can be reduced, so that the risk of fracture at the connecting position of the electric connecting piece and the pole can be reduced, the risk of short circuit of the battery monomer can be reduced, and the reliability of the battery device is improved.

Description

Technical Field

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

[0002] In existing technologies, the battery pack is typically mounted on top of the battery cell, with its welding points to the cell terminals directly exposed above the module, lacking additional mechanical protection. Furthermore, because the battery pack is suspended, when the battery assembly is subjected to lateral pressure and deforms, the welding points between the battery pack and the terminals are prone to breakage due to shear force, or the deformed pack may come into contact with the casing, causing a short circuit. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a battery device that can effectively prevent the torsional breakage of electrical connectors caused by uneven amplitude during the movement of multiple battery cells; simultaneously, it can reduce stress concentration at the connection point between the electrical connector and the terminal, thereby reducing the risk of breakage at the connection point and thus reducing the risk of short circuits in the battery cells, improving the reliability of the battery device.

[0004] This application also proposes an electrical device having the above-mentioned battery device.

[0005] In a first aspect, embodiments of this application provide a battery device, comprising: a housing having a receiving cavity formed inside, and a bottom plate; a plurality of battery cells arranged within the receiving cavity, each battery cell having a terminal post arranged on the side of the battery cell facing the bottom plate; an electrical connecting piece connected to the terminal post of the battery cell; and a reinforcing plate fixed to the bottom plate and located on the side of the bottom plate facing the plurality of battery cells, the reinforcing plate being fixedly connected to the electrical connecting piece.

[0006] In the above technical solution, by setting a reinforcing plate and fixing it to the electrical connector, the phenomenon of torsional breakage of the electrical connector caused by uneven amplitude during the movement of multiple battery cells can be effectively prevented. At the same time, when the battery device is subjected to a side impact, the side impact force is transmitted to multiple battery cells, and the impact force can be transmitted to the reinforcing plate through the electrical connector, and then to the base plate. In this way, the stress concentration at the connection between the electrical connector and the terminal post can be reduced, thereby reducing the risk of breakage at the connection between the electrical connector and the terminal post, thus reducing the risk of short circuit of battery cells and improving the reliability of the battery device.

[0007] In some embodiments, a plurality of reinforcing ribs are formed on the reinforcing plate, and the reinforcing plate is fixedly connected to the electrical connecting piece through the reinforcing ribs.

[0008] In the above technical solution, by setting a reinforcing plate and fixing it to the electrical connector through reinforcing ribs, the bottom impact force can be effectively prevented from acting directly on the electrical connector, thereby further improving the connection stability between the electrical connector and the terminal post. At the same time, the reinforcing ribs can also create a space between the battery cell and the reinforcing plate. This space can serve as a venting space. When the battery cell experiences thermal runaway, high-temperature and high-pressure gas can be discharged through this space, thereby reducing the risk of thermal runaway of the entire battery device.

[0009] In some embodiments, the cross-sectional area of ​​the reinforcing ribs gradually increases in the direction of the battery cell toward the base plate.

[0010] In the above technical solution, by setting the cross-sectional area of ​​the reinforcing ribs gradually increasing in the direction of the battery cell facing the bottom plate, the reinforcing ribs and the bottom plate can be made to form a certain angle. In this way, when the box is side-collision and the bottom plate flips, the reinforcing ribs will not apply stress to the electrical connection piece, thereby causing the electrical connection piece to tear, thus reducing the risk of short circuit of the battery device.

[0011] In some embodiments, the cross-section of the reinforcing rib perpendicular to its length direction is trapezoidal.

[0012] In the above technical solution, by setting the cross-section of the reinforcing rib perpendicular to the length direction of the reinforcing rib to be trapezoidal, the connection stability between the electrical connector and the reinforcing rib can be increased. At the same time, the stress dispersion can be improved and the stress concentration can be reduced, thereby reducing the risk of breakage at the connection between the electrical connector and the terminal post. This can reduce the risk of short circuit in the battery cell and improve the reliability of the battery device.

[0013] In some embodiments, the battery device further includes a first adhesive layer, through which the electrical connector and the reinforcing plate are bonded together.

[0014] In the above technical solution, by setting a first adhesive layer, the electrical connector and the reinforcing plate are bonded together through the first adhesive layer, which can reduce the assembly difficulty of the battery device. At the same time, it can also insulate the electrical connector and the reinforcing plate, and thus insulate the electrical connector from the entire housing, thereby ensuring the reliability of the entire battery device. In addition, it can also distribute stress evenly on the contact surface between the electrical connector and the reinforcing plate, thereby effectively reducing stress concentration and reducing the risk of damage to the electrical connector.

[0015] In some embodiments, the electrical connector is connected to the electrode post through a first weld. In the horizontal projection plane, a portion of the projection of the first weld coincides with the projection of the first adhesive layer, and the projection of the starting end of the first weld is arranged outside the projection of the first adhesive layer.

[0016] In the above technical solution, by arranging the projection of the starting end of the first weld seam outside the projection of the first adhesive layer in the horizontal projection plane, when the force acting on the reinforcing plate is transmitted toward the electrical connector, the force can avoid the high-incidence area of ​​welding defects, thereby reducing the risk of the electrical connector being pulled off by the reinforcing plate and failing, thus improving the reliability of the battery device.

[0017] In some embodiments, in the extension direction of the first weld, the initial end of the first weld extends beyond the first adhesive layer by a length greater than or equal to 1 mm.

[0018] In the above technical solution, by setting the length of the initial end of the first weld extending beyond the first adhesive layer to be greater than or equal to 1 mm in the extension direction of the first weld, it can be ensured that the stress peak avoids the poor position of the heat-affected zone of the weld, thereby reducing the risk of the electrical connector being pulled off by the reinforcing plate and thus improving the reliability of the battery device.

[0019] In some embodiments, the first adhesive layer extends in a strip shape along the length direction of the reinforcing plate, and the width W of the first adhesive layer in the width direction of the reinforcing plate satisfies: W=k(W1-2d), where W1 is the overlap width of the electrical connector and the reinforcing plate in the width direction of the reinforcing plate, d is the length of the initial end of the first weld extending out of the first adhesive layer, and k is an effective coefficient, where 0.8≤k≤0.95.

[0020] In the above technical solution, by setting the width W of the first adhesive layer to satisfy: W=k(W1-2d), the connection stability between the electrical connector and the reinforcing plate can be ensured, while the adhesive force between the electrical connector and the reinforcing plate can be controlled to be less than the welding tensile force of the weld. This makes the adhesive surface a weak point of the interface. In this way, when the collision force of the vehicle is transmitted to the reinforcing plate through the housing, the adhesive surface can be damaged first, thereby interrupting the further transmission of force toward the electrical connector. This reduces the force transmitted to the weld position and reduces the risk of the electrical connector separating from the terminal post. As a result, the risk of short circuit in the battery cell can be reduced, and the reliability of the battery device can be improved.

[0021] In some embodiments, the first adhesive layer extends in the length direction of the reinforcing plate as a strip, and the width of the first adhesive layer in the width direction of the reinforcing plate is 8mm-12mm.

[0022] In the above technical solution, by setting the first adhesive layer to extend in a strip shape along the length of the reinforcing plate, and the width of the first adhesive layer being 8mm-12mm in the width direction of the reinforcing plate, the adhesive force between the electrical connector and the reinforcing plate can be made less than the welding tensile force of the weld, making the adhesive surface a weak point of the interface. In this way, when the collision force of the vehicle is transmitted to the reinforcing plate through the housing, the adhesive surface can be damaged first, thereby interrupting the further transmission of force toward the electrical connector, thus reducing the force transmitted to the weld position, reducing the risk of the electrical connector separating from the terminal post, thereby reducing the risk of short circuit of the battery cell and improving the reliability of the battery device.

[0023] In some embodiments, the electrical connector is connected to the electrode post via a first weld, and the first weld and the first adhesive layer are spaced apart.

[0024] In the above technical solution, the electrical connector is connected to the electrode post through the first weld. The first weld and the first adhesive layer are arranged at intervals, which allows the force acting on the reinforcing plate to be transmitted towards the electrical connector without passing through the welding area. This reduces the risk of the electrical connector being pulled off by the reinforcing plate and thus improves the reliability of the battery device.

[0025] In some embodiments, in the extension direction of the first weld, the distance between the first weld and the first adhesive layer is greater than or equal to 1 mm.

[0026] In the above technical solution, in the extension direction of the first weld, the distance d2 between the first weld and the first adhesive layer is greater than or equal to 1mm, which can ensure that the stress peak avoids the starting end of the first weld, thereby reducing the risk of the electrical connector being pulled off by the reinforcing plate and thus improving the reliability of the battery device.

[0027] In some embodiments, the reinforcing plate is an insulating component.

[0028] In the above technical solution, by setting the reinforcing plate as an insulating component, the electrical connecting piece can be insulated from the reinforcing plate and the housing, thereby preventing short circuits between the electrical connecting piece and the housing and ensuring the normal operation of the entire battery device.

[0029] In some embodiments, the battery device further includes a buffer disposed within a receiving cavity and between a plurality of battery cells and the sidewalls of the housing.

[0030] In the above technical solution, by setting up a buffer, the battery cells and the housing can be isolated circumferentially from multiple battery cells. On the one hand, in the event of a vehicle collision, it can effectively prevent the electrical connectors from contacting the side wall of the housing due to displacement of the battery cells, thus preventing short circuits and improving the reliability of the battery device. On the other hand, in the event of a vehicle collision, the buffer can also play a certain role in buffering and fixing, reducing the impact force transmitted to the battery cells and reducing the lateral displacement of the battery cells. This reduces the risk of the electrical connectors being torn at the connection point with the terminals, thus improving the reliability of the entire battery device.

[0031] In some embodiments, the buffer extends in a strip shape along the length direction and / or width direction of the housing; or, the buffer is formed in a ring around the circumference of multiple battery cells.

[0032] In the above technical solution, by setting the buffer to extend in a strip shape along the length and / or width of the housing, the structure of the buffer can be simplified. At the same time, the placement of the buffer can be selected according to actual needs. For example, when only side impact protection of the battery device is required, it can be set only between the side wall of the battery device and the battery cell. This can improve the flexibility of the buffer placement and reduce the overall production cost of the battery device. By setting the buffer to form a ring around the circumference of multiple battery cells, the buffer can protect the battery cells from multiple directions, thereby further improving the reliability of the battery device.

[0033] In some embodiments, the housing includes a first housing and a second housing, the first housing and the second housing covering each other and jointly defining a receiving cavity, and a plurality of buffers, the plurality of buffers being arranged in the first housing and the second housing respectively.

[0034] In the above technical solution, by setting up a first box and a second box, the assembly of the battery device can be simplified and the manufacturing convenience of the box can be improved. In addition, by arranging buffers in the first box and the second box respectively, the buffering effect of the buffers can be further increased and the reliability of the battery device can be improved.

[0035] Secondly, embodiments of this application also provide an electrical device, including a battery device according to the first aspect of this application.

[0036] In the above technical solution, by setting the battery device of the first aspect embodiment, the overall performance of the power-consuming device is improved.

[0037] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of a vehicle according to an embodiment of this application;

[0039] Figure 2 This is a schematic diagram of a battery device according to an embodiment of this application;

[0040] Figure 3 This is a schematic diagram of a battery device according to an embodiment of this application from another angle;

[0041] Figure 4 It is along Figure 3 The cross-sectional view of line AA shown;

[0042] Figure 5 yes Figure 4 Enlarged view of point A circled in the image;

[0043] Figure 6 This is a partial schematic diagram of a battery device according to an embodiment of this application;

[0044] Figure 7 This is a partial schematic diagram of a battery device according to another embodiment of this application.

[0045] Figure label:

[0046] 1000, vehicles;

[0047] 100. Battery device;

[0048] 10. Box body; 101. Receiving cavity; 11. First box body; 12. Second box body; 13. Base plate;

[0049] 20. Battery cell;

[0050] 30. Electrical connector;

[0051] 40. Reinforcing plate; 41. Reinforcing rib;

[0052] 50. First adhesive layer; 60. First weld; 70. Buffer component;

[0053] 200, controller; 300, motor. Detailed Implementation

[0054] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0055] 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.

[0056] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0057] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0058] 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.

[0059] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0060] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", 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.

[0061] In the description of the embodiments of this application, unless otherwise expressly specified and limited, 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.

[0062] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage 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 aerospace and other fields. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0063] In existing technologies, for ease of installation and arrangement, the battery pack is usually installed on top of the battery cell, with its welding point to the cell terminal directly exposed above the module, lacking additional mechanical protection. Furthermore, because the battery pack is suspended, when the battery assembly is subjected to lateral compression and deforms, the welding point between the battery pack and the terminal is prone to breakage due to shear force, or the deformed battery pack may come into contact with the casing, causing a short circuit.

[0064] Based on the above considerations, in order to solve the problem that the welding point between the battery pack and the terminal post is prone to breakage due to shear force, or that the battery may short-circuit after deformation and contact with the casing, the embodiments of this application provide a battery device. The battery device includes: a casing with a receiving cavity formed inside the casing and a bottom plate; multiple battery cells arranged in the receiving cavity, each battery cell having a terminal post arranged on the side of the battery cell facing the bottom plate; an electrical connecting piece connected to the terminal post of the battery cell; and a reinforcing plate fixed to the bottom plate and located on the side of the bottom plate facing the multiple battery cells, the reinforcing plate being fixedly connected to the electrical connecting piece. This design allows the reinforcing plate to secure the electrical connectors, effectively preventing torsional breakage due to uneven amplitude during movement of multiple battery cells. Simultaneously, when the battery pack experiences a side impact, the force is transmitted to multiple battery cells. Because the electrical connectors are connected to the terminals and the reinforcing plate, the impact force can be transferred from the electrical connectors to the reinforcing plate, and then to the base plate. This reduces stress concentration at the connection point between the electrical connectors and the terminals, thus lowering the risk of breakage at this connection and reducing the risk of short circuits in the battery cells, thereby improving the reliability of the battery pack.

[0065] The battery device disclosed in this application can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0066] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0067] Reference Figure 1 , Figure 1 This is a schematic diagram of a vehicle 1000 provided 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. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100 is disposed 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.

[0068] In some embodiments of this application, 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 power for the vehicle 1000.

[0069] Reference Figure 2 , Figure 2This is a schematic diagram of a battery device 100 according to some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 20. The housing 10 has a cavity, and the battery cell 20 is accommodated within the cavity of the housing 10. The housing 10 provides a space for accommodating the battery cell 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first part (e.g., a first housing 11 as described below) and a second part (e.g., a second housing 12 as described below), the first housing 11 and the second housing 12 being connected to jointly define a receiving cavity 101 for accommodating the battery cell 20. The first housing 11 may be a hollow structure with one end open, and the second housing 12 may be a plate-like structure, the second housing 12 covering the open side of the first housing 11 to close the open side of the first housing 11; the first housing 11 and the second housing 12 may also both be hollow structures with one side open, the open side of the first housing 11 covering the open side of the second housing 12. Of course, the box 10 formed by the first box 11 and the second box 12 can be of various shapes, such as cylinder, cuboid, etc.

[0070] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0071] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0072] The following is for reference. Figures 2-7 A battery device 100 according to an embodiment of the first aspect of this application is described. Figures 2-3 These are schematic diagrams of the battery device 100 from different angles according to some embodiments of this application; Figure 4 The cross-sectional view of line AA shown; Figure 5 yes Figure 4 Enlarged view of point A circled in the image; Figure 6 This is a partial schematic diagram of a battery device 100 according to an embodiment of this application; Figure 7 This is a partial schematic diagram of a battery device according to other embodiments of this application.

[0073] Embodiments of this application provide a battery device 100, with reference to... Figure 2 and Figures 5-6 The battery device 100 includes: a housing 10, a plurality of battery cells 20, an electrical connector 30, and a reinforcing plate 40. The housing 10 has a receiving cavity 101 inside and a bottom plate 13. The plurality of battery cells 20 are arranged in the receiving cavity 101, and each battery cell 20 has a terminal post, which is arranged on the side of the battery cell 20 facing the bottom plate 13. The electrical connector 30 is connected to the terminal post of the battery cell 20. The reinforcing plate 40 is fixed on the bottom plate 13 and is located on the side of the bottom plate 13 facing the plurality of battery cells 20. The reinforcing plate 40 is fixedly connected to the electrical connector 30.

[0074] The housing 10 is the main load-bearing component of the battery pack, primarily providing load-bearing space for multiple battery cells 20, and also serving to protect the battery cells 20. Exemplarily, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, the top cover or upper housing 10 can be part of the floor 13 of the vehicle 1000.

[0075] Multiple battery cells 20 are the core components of the battery device 100, mainly used for storing and releasing energy. Specifically, a battery cell 20 generally includes: a housing, an electrode assembly, and terminals. The housing is used to house the electrode assembly and fix the terminals. The shape of the housing can be adjusted according to the type of battery cell 20. For example, when the battery cell 20 is a square battery, the housing is square; when the battery cell 20 is a cylindrical battery, the housing is cylindrical. In the embodiments of this application, a square housing is used as an example for illustration.

[0076] The terminals are mainly used to connect the battery cell 20 to the electrical connector 30 and transmit electrical energy. The terminal material can be copper, aluminum, zinc, or their alloys, etc., and the shape of the terminal can be set to a circular, rectangular, or other shapes according to design requirements. Generally, there are at least two terminals, specifically, at least one positive terminal and at least one negative terminal.

[0077] The electrode assembly is the core component of the battery cell 20, mainly used to store or release electrical energy. The electrode assembly is usually formed by stacking or winding electrode sheets and separators. The electrode sheets include positive electrode sheets and negative electrode sheets. The positive electrode tabs led out from the positive electrode sheets are electrically connected to the positive electrode post, and the negative electrode tabs led out from the negative electrode sheets are electrically connected to the negative electrode post.

[0078] It should be noted that, for ease of description, the embodiments in this application will not distinguish between the positive and negative electrodes of the terminals, tabs, etc. The terminals, tabs, etc. involved in the embodiments of this application and their related descriptions can be applied to structures such as positive terminals, negative terminals, positive tabs, and negative tabs.

[0079] The electrical connector 30 connects multiple battery cells 20 by connecting their terminals. The electrical connector 30 is made of a conductive material, such as copper, aluminum, or a copper-aluminum composite material.

[0080] The reinforcing plate 40 is fixed to the base plate 13, which can improve the structural strength of the bottom of the housing 10, thereby improving the bottom impact performance of the entire battery device 100. Furthermore, the reinforcing plate 40 is also fixedly connected to the electrical connecting piece 30, meaning that the reinforcing plate 40 can fix the electrical connecting piece 30. This effectively prevents the electrical connecting piece 30 from tortuously breaking due to uneven amplitude during the movement of multiple battery cells 20. Simultaneously, when the battery device 100 is subjected to a side impact, and the side impact force is transmitted to the multiple battery cells 20, since the electrical connecting piece 30 is connected to the terminal and the reinforcing plate 40, the impact force can be transmitted through the electrical connecting piece 30 to the reinforcing plate 40, and then through the reinforcing plate 40 to the base plate 13. This reduces stress concentration at the connection point between the electrical connecting piece 30 and the terminal, thereby reducing the risk of breakage at the connection point and thus reducing the risk of short circuits in the battery cells 20, improving the reliability of the battery device 100.

[0081] It should be noted that, since the electrical connecting piece 30 has a conductive function, in order to ensure the normal operation of the battery device 100, it is necessary to ensure that the electrical connecting piece 30 is insulated from the housing 10. The reinforcing plate 40 is fixedly connected to the electrical connecting piece 30 and is connected to the bottom plate 13 of the housing 10. Therefore, in this application, the reinforcing plate 40 is insulated from the electrical connecting piece 30. For example, the reinforcing plate 40 can be an insulating material component, or the electrical connecting piece 30 and the reinforcing plate 40 are connected by an insulating material. No limitation is made here.

[0082] In the above technical solution, by setting the reinforcing plate 40 and the electrical connecting piece 30 to be fixedly connected, the phenomenon of torsional breakage of the electrical connecting piece 30 caused by the different amplitudes of multiple battery cells 20 during movement can be effectively prevented. At the same time, when the battery device 100 is subjected to a side impact, the side impact force is transmitted to multiple battery cells 20, and the impact force can be transmitted to the reinforcing plate 40 through the electrical connecting piece 30, and then to the base plate 13. In this way, the stress concentration at the connection position between the electrical connecting piece 30 and the terminal post can be reduced, thereby reducing the risk of breakage at the connection position between the electrical connecting piece 30 and the terminal post, thus reducing the risk of short circuit of the battery cells 20 and improving the reliability of the battery device 100.

[0083] In some embodiments, refer to Figures 4-5 Multiple reinforcing ribs 41 are formed on the reinforcing plate 40, and the reinforcing plate 40 is fixedly connected to the electrical connecting piece 30 through the reinforcing ribs 41.

[0084] Specifically, the reinforcing rib 41 is formed as a rib protruding towards the battery cell 20. The reinforcing rib 41 can improve the structural strength of the reinforcing plate 40, thereby improving the structural strength of the bottom of the entire battery device 100, improving the impact resistance of the bottom, and thus improving the reliability of the entire battery device 100.

[0085] The reinforcing plate 40 is fixedly connected to the electrical connector 30 via the reinforcing rib 41. In other words, the electrical connector 30 is connected to the reinforcing rib 41. In this way, when the battery device 100 is subjected to a bottom impact, the bottom impact force can be effectively prevented from acting directly on the electrical connector 30, thereby further improving the connection stability between the electrical connector 30 and the terminal post. At the same time, the reinforcing rib 41 can also create a space between the battery cell 20 and the reinforcing plate 40. This space can serve as a venting space. When the battery cell 20 experiences thermal runaway, high-temperature and high-pressure gas can be discharged through this space, thereby reducing the risk of thermal runaway of the entire battery device 100.

[0086] Optional, for example Figures 4-5 As shown, the battery device 100 also includes: a support member, a plurality of reinforcing ribs 41 are arranged at intervals along the width direction of the housing 10, and a groove is formed between two adjacent reinforcing ribs 41. The number of support members is multiple, the support members are arranged in the grooves and between two adjacent battery cells 20, and are used to support the two adjacent battery cells 20.

[0087] In the above technical solution, by setting the reinforcing plate 40 and fixing it to the electrical connection piece 30 through the reinforcing rib 41, the bottom impact force can be effectively prevented from acting directly on the electrical connection piece 30, thereby further improving the connection stability between the electrical connection piece 30 and the terminal post. At the same time, the reinforcing rib 41 can also create a space between the battery cell 20 and the reinforcing plate 40. This space can serve as an exhaust space. When the battery cell 20 experiences thermal runaway, high-temperature and high-pressure gas can be discharged through this space, thereby reducing the risk of thermal runaway of the entire battery device 100.

[0088] In some embodiments, refer to Figure 5 In the direction from the battery cell 20 toward the base plate 13, the cross-sectional area of ​​the reinforcing rib 41 gradually increases.

[0089] Understandably, the reinforcing rib 41 is formed as a "thick at the bottom and thin at the top" gradient structure. That is, in the direction of the battery cell 20 toward the base plate 13, the reinforcing rib 41 forms a certain angle with the base plate 13. In this way, when the housing 10 is side-impacted and the base plate 13 is flipped, the reinforcing rib 41 will not apply stress to the electrical connection piece 30, thereby causing the electrical connection piece 30 to tear, thus reducing the risk of short circuit of the battery device 100.

[0090] In the above technical solution, by setting the cross-sectional area of ​​the reinforcing rib 41 gradually increasing in the direction of the battery cell 20 toward the base plate 13, the reinforcing rib 41 and the base plate 13 can be at a certain angle. In this way, when the box 10 is side-collisioned and the base plate 13 is flipped, the reinforcing rib 41 will not apply stress to the electrical connection piece 30, thereby causing the electrical connection piece 30 to tear, thus reducing the risk of short circuit of the battery device 100.

[0091] In some embodiments, refer to Figure 5 The cross-section of the reinforcing rib 41 perpendicular to its length direction is trapezoidal.

[0092] It is understandable that the connection between the reinforcing rib 41 and the electrical connecting piece 30 is a surface connection, and the connection between the reinforcing rib 41 and the reinforcing plate 40 is also a surface connection. This can increase the connection stability between the electrical connecting piece 30 and the reinforcing rib 41, and at the same time, it can improve the stress dispersion and reduce stress concentration. This can reduce the risk of breakage at the connection between the electrical connecting piece 30 and the terminal post, thereby reducing the risk of short circuit in the battery cell 20 and improving the reliability of the battery device 100.

[0093] It should be noted that the length direction of the reinforcing rib 41 is consistent with the arrangement direction of the multiple battery cells 20, which facilitates the connection between the electrical connecting piece 30 and the reinforcing rib 41.

[0094] It should be noted that the reinforcing rib 41 can be an independent structure connected to the reinforcing plate 40, or it can be integrally formed with the reinforcing plate 40 by stamping.

[0095] In the above technical solution, by setting the cross-section of the reinforcing rib 41 perpendicular to the length direction of the reinforcing rib 41 to be trapezoidal, the connection stability between the electrical connecting piece 30 and the reinforcing rib 41 can be increased. At the same time, the stress dispersion can be improved and the stress concentration can be reduced, thereby reducing the risk of breakage at the connection between the electrical connecting piece 30 and the terminal post. This can reduce the risk of short circuit in the battery cell 20 and improve the reliability of the battery device 100.

[0096] In some embodiments, refer to Figures 5-6 The battery device 100 further includes a first adhesive layer 50, through which the electrical connecting piece 30 and the reinforcing plate 40 are bonded together.

[0097] The adhesive structure is relatively simple. Thus, the electrical connector 30 and the reinforcing plate 40 are connected by adhesive, which reduces the assembly difficulty of the battery device 100. At the same time, the adhesive can also play an insulating role, which can insulate the electrical connector 30 and the reinforcing plate 40, and thus insulate the electrical connector 30 from the entire housing 10, thereby ensuring the reliability of the entire battery device 100. In addition, the adhesive can also distribute stress evenly on the contact surface between the electrical connector 30 and the reinforcing plate 40, thereby effectively reducing stress concentration and reducing the risk of damage to the electrical connector 30.

[0098] In the above technical solution, by setting the first adhesive layer 50, the electrical connecting piece 30 and the reinforcing plate 40 are bonded together through the first adhesive layer 50, which can reduce the assembly difficulty of the battery device 100. At the same time, it can also insulate the electrical connecting piece 30 and the reinforcing plate 40, thereby insulating the electrical connecting piece 30 from the entire housing 10, thus ensuring the reliability of the entire battery device 100. In addition, it can also distribute stress evenly on the contact surface between the electrical connecting piece 30 and the reinforcing plate 40, thereby effectively reducing stress concentration and reducing the risk of damage to the electrical connecting piece 30.

[0099] In some embodiments, refer to Figure 6 The electrical connector 30 is connected to the pole through the first weld 60. In the horizontal projection plane, part of the projection of the first weld 60 coincides with the projection of the first adhesive layer 50. The projection of the starting end of the first weld 60 is arranged outside the projection of the first adhesive layer 50.

[0100] It is understandable that the electrical connector 30 is welded to the pole and the electrical connector 30 is bonded to the reinforcing plate 40.

[0101] The phrase "partial projection of the first weld 60 coincides with the projection of the first adhesive layer 50, and the projection of the starting end of the first weld 60 is arranged outside the projection of the first adhesive layer 50" can be understood as follows: in the direction from the base plate 13 to the battery cell 20, the first adhesive layer 50 covers a portion of the first weld 60, and the starting end of the first weld 60 forms a certain distance from the edge of the first adhesive layer 50. It should be noted that the weld location is generally a weak point in the structure, and the starting end of the weld is the weakest link among the weakest. Therefore, by arranging the projection of the starting end of the first weld 60 outside the projection of the first adhesive layer 50 in the horizontal projection plane, that is, by avoiding the initial welding position of the bonding area between the electrical connector 30 and the reinforcing plate 40, when the force acting on the reinforcing plate 40 is transmitted towards the electrical connector 30, the force can avoid areas prone to welding defects, thereby reducing the risk of the electrical connector 30 being pulled off by the reinforcing plate 40 and improving the reliability of the battery device 100.

[0102] In the above technical solution, by arranging the projection of the starting end of the first weld 60 on the outside of the projection of the first adhesive layer 50 in the horizontal projection plane, when the force acting on the reinforcing plate 40 is transmitted toward the electrical connector 30, the force can avoid the high-incidence area of ​​welding defects, thereby reducing the risk of the electrical connector 30 being pulled off by the reinforcing plate 40 and failing, thereby improving the reliability of the battery device 100.

[0103] In some embodiments, refer to Figure 6 In the extension direction of the first weld 60, the length d1 of the initial end of the first weld 60 extending out of the first adhesive layer 50 is greater than or equal to 1 mm.

[0104] For example, in the extension direction of the first weld 60, the length d1 of the initial end of the first weld 60 extending out of the first adhesive layer 50 can be 1 mm, 2 mm, 3 mm or more.

[0105] In the above technical solution, by setting the length of the initial end of the first weld 60 extending out of the first adhesive layer 50 to be greater than or equal to 1 mm in the extension direction of the first weld 60, it can be ensured that the stress peak avoids the poor position of the heat-affected zone of the weld, thereby reducing the risk of the electrical connection piece 30 being pulled off by the reinforcing plate 40 and thus improving the reliability of the battery device 100.

[0106] In some embodiments, refer to Figure 6 The first adhesive layer 50 extends in a strip shape along the length direction of the reinforcing plate 40. In the width direction of the reinforcing plate 40, the width W of the first adhesive layer 50 satisfies: W=k(W1-2d1), where W1 is the overlap width of the electrical connecting piece 30 and the reinforcing plate 40 in the width direction of the reinforcing plate 40, d1 is the length of the initial end of the first weld 60 extending out of the first adhesive layer 50, and k is an effective coefficient, where 0.8≤k≤0.95.

[0107] It is understandable that the width of the first adhesive layer 50 is equal to the product of the difference between the overlapping width of the electrical connector 30 and the reinforcing plate 40 and twice the length of the initial end of the first weld 60 extending out of the first adhesive layer 50, and the effective coefficient.

[0108] The term "overlapping width of electrical connecting piece 30 and reinforcing plate 40" can be understood as follows: if electrical connecting piece 30 is directly connected to reinforcing plate 40, and the width of reinforcing plate 40 is greater than the width of electrical connecting piece 30, then it is the width of electrical connecting piece 30; if electrical connecting piece 30 is bonded to reinforcing rib 41 on reinforcing plate 40, then it is the overlapping width of electrical connecting piece 30 and reinforcing rib 41.

[0109] The fact that the initial end of the first weld 60 extends twice the length of the first adhesive layer 50 ensures that the first adhesive layer 50 can connect to the electrical connector 30 at a location with poor heat-affected zone of the weld.

[0110] The effective coefficient is related to the shear modulus of the adhesive layer, which is the adhesive's ability to resist deformation under shear stress. For example, the effective coefficient can be 0.8, 0.85, 0.9, or 0.95.

[0111] In the above technical solution, by setting the width W of the first adhesive layer 50 to satisfy: W=k(W1-2d), the connection stability between the electrical connector 30 and the reinforcing plate 40 can be ensured, while the adhesive force between the electrical connector 30 and the reinforcing plate 40 can be controlled to be less than the welding tensile force of the weld, making the adhesive surface a weak point of the interface. In this way, when the collision force of the vehicle 1000 is transmitted to the reinforcing plate 40 through the housing 10, the adhesive surface can be damaged first, thereby interrupting the further transmission of force toward the electrical connector 30. This reduces the force transmitted to the weld position and reduces the risk of the electrical connector 30 detaching from the terminal post. As a result, the risk of short circuit of the battery cell 20 can be reduced, and the reliability of the battery device 100 can be improved.

[0112] In some embodiments, refer to Figure 6 The first adhesive layer 50 extends in a strip shape along the length of the reinforcing plate 40, and the width W of the first adhesive layer 50 is 8mm-12mm in the width direction of the reinforcing plate 40.

[0113] For example, the width W of the first adhesive layer 50 can be 8mm, 9mm, 10mm, 11mm or 12mm.

[0114] In the above technical solution, by setting the first adhesive layer 50 to extend in a strip shape along the length direction of the reinforcing plate 40, and the width of the first adhesive layer 50 in the width direction of the reinforcing plate 40 to be 8mm-12mm, the adhesive force between the electrical connector 30 and the reinforcing plate 40 can be made less than the welding tensile force of the weld, making the adhesive surface a weak point of the interface. In this way, when the collision force of the vehicle 1000 is transmitted to the reinforcing plate 40 through the housing 10, the adhesive surface can be damaged first, thereby interrupting the further transmission of force toward the electrical connector 30, thereby reducing the force transmitted to the weld position, reducing the risk of the electrical connector 30 detaching from the terminal post, thereby reducing the risk of short circuit of the battery cell 20 and improving the reliability of the battery device 100.

[0115] In some embodiments, refer to Figure 7 The electrical connector 30 is connected to the pole through the first weld 60, and the first weld 60 and the first adhesive layer 50 are arranged at intervals.

[0116] Specifically, the electrical connector 30 is welded to the terminal post and bonded to the reinforcing plate 40, with the bonding area and welding area arranged alternately. Since the weld is a linear connection, it can become a single-point stress point under lateral impact, making it more prone to becoming a weak point at the interface. Therefore, the first weld 60 and the first adhesive layer 50 are arranged alternately. This way, when the force acting on the reinforcing plate 40 is transmitted towards the electrical connector 30, the force can bypass the welding area, thereby reducing the risk of the electrical connector 30 being pulled off by the reinforcing plate 40 and failing, thus improving the reliability of the battery device 100.

[0117] For example, Figure 7 As shown, the first weld 60 extends in the left-right direction, and the first adhesive layer 50 extends in the front-back direction. The first weld 60 and the first adhesive layer 50 are arranged at intervals in the left-right direction. The first adhesive layer 50 can be arranged at the left end or the right end of the first weld 60. The specific position can be designed according to the actual situation and is not limited here.

[0118] In the above technical solution, the electrical connector 30 is connected to the electrode post through the first weld 60. The first weld 60 and the first adhesive layer 50 are arranged at intervals, which allows the force acting on the reinforcing plate 40 to be transmitted towards the electrical connector 30, so that the force can be transmitted without the welding area. This reduces the risk of the electrical connector 30 being pulled off by the reinforcing plate 40 and thus improves the reliability of the battery device 100.

[0119] In some embodiments, refer to Figure 7 In the extension direction of the first weld 60, the distance d2 between the first weld 60 and the first adhesive layer 50 is greater than or equal to 1 mm.

[0120] For example, in the extension direction of the first weld 60, the spacing d2 between the first weld 60 and the first adhesive layer 50 can be 1 mm, 2 mm, 3 mm or more.

[0121] In the above technical solution, in the extension direction of the first weld 60, the distance d2 between the first weld 60 and the first adhesive layer 50 is greater than or equal to 1mm, which can ensure that the stress peak avoids the starting end of the first weld 60, thereby reducing the risk of the electrical connection piece 30 being pulled off by the reinforcing plate 40 and thus improving the reliability of the battery device 100.

[0122] In some embodiments, the reinforcing plate 40 is an insulating element.

[0123] Specifically, the reinforcing plate 40 is made of an insulating material with a certain strength. The insulating material includes various types, such as polyamide and fiber resin materials, which are not limited here.

[0124] Optionally, the reinforcing plate 40 and the base plate 13 are connected by adhesive bonding. The adhesive bonding process is relatively simple, which can improve the production rate of the entire battery device 100. At the same time, the adhesive bonding can also distribute the stress evenly on the contact surface of the reinforcing plate 40 and the base plate 13, thereby effectively reducing stress concentration and improving the connection reliability between the reinforcing plate 40 and the base plate 13.

[0125] In the above technical solution, by setting the reinforcing plate 40 as an insulating component, the electrical connecting piece 30 can be insulated from the reinforcing plate 40 and the housing 10, thereby preventing short circuits between the electrical connecting piece 30 and the housing 10, and ensuring the normal operation of the entire battery device 100.

[0126] In some embodiments, refer to Figure 5 The battery device 100 also includes a buffer 70, which is arranged in the receiving cavity 101 and between the plurality of battery cells 20 and the side wall of the housing 10.

[0127] Specifically, the buffer element 70 is generally made of polymer or elastic materials, which have good insulation properties. Therefore, the buffer element 70 generally has insulation properties. That is to say, the buffer element 70, arranged between the battery cell 20 and the side wall of the casing 10, not only plays a buffering role but also provides a certain degree of insulation. It should be noted that the materials used to manufacture the buffer element 70 include various types, such as rubber, polyurethane, and foam, etc., and are not limited here.

[0128] In the above technical solution, by setting the buffer 70, the battery cells 20 and the housing 10 can be isolated circumferentially from the multiple battery cells 20. On the one hand, when the vehicle 1000 collides, it can effectively prevent the electrical connector 30 from contacting the side wall of the housing 10 due to the displacement of the battery cells 20, thereby improving the reliability of the battery device 100. On the other hand, when the vehicle 1000 collides, the buffer 70 can also play a certain role in buffering and fixing. While reducing the impact force transmitted to the battery cells 20, it can also reduce the lateral displacement of the battery cells 20, thereby reducing the risk of the electrical connector 30 being torn at the connection position with the terminal post, and improving the reliability of the entire battery device 100.

[0129] In some embodiments, the buffer 70 extends in a strip shape along the length direction and / or width direction of the housing 10; or, the buffer 70 is formed in a ring shape around the circumference of the plurality of battery cells 20.

[0130] It is understood that in some embodiments, the buffer 70 extends along the length direction and / or the width direction of the housing 10; in other embodiments, the buffer 70 extends circumferentially around the plurality of battery cells 20 to form a ring.

[0131] The phrase "the buffer 70 extends in a strip along the length direction and / or the width direction of the box 10" can be understood to mean that the buffer 70 can extend in a strip along the length direction of the box 10, or it can extend in a strip along the width direction of the box 10, or it can extend in a strip partly along the width direction of the box 10 and partly along the length direction of the box 10.

[0132] Specifically, when the buffer 70 extends into a strip along the length of the housing 10, the buffer 70 is arranged between the two side walls of the housing 10 in the width direction and the multiple battery cells 20; when the buffer 70 extends into a strip along the width direction of the housing 10, the buffer 70 is arranged between the side walls of the housing 10 at both ends in the length direction and the multiple battery cells 20; when the buffer 70 extends partly into a strip along the width direction of the housing 10 and partly into a strip along the length direction of the housing 10, the buffer 70 is formed into an L-shape, that is, the buffer 70 is arranged between the two side walls in the width direction and the two side walls in the length direction of the housing 10 and the multiple battery cells 20.

[0133] In the above technical solution, by setting the buffer 70 to extend in a strip shape along the length direction and / or width direction of the housing 10, the structure of the buffer 70 can be simplified. At the same time, the arrangement position of the buffer 70 can be selected according to actual needs. For example, when only side impact protection of the battery device 100 is required, it can be set only between the side wall of the battery device 100 and the battery cell 20. This can improve the flexibility of the arrangement of the buffer 70 and reduce the production cost of the entire battery device 100. By setting the buffer 70 to form a ring around the circumference of multiple battery cells 20, the buffer 70 can protect the battery cells 20 from multiple directions, thereby further improving the reliability of the battery device 100.

[0134] In some embodiments, refer to Figure 5 The housing 10 includes a first housing 11 and a second housing 12, which cover each other and jointly define the receiving cavity 101. There are multiple buffers 70, which are respectively arranged in the first housing 11 and the second housing 12.

[0135] Specifically, the first housing 11 and the second housing 12 together provide housing space and protection for the battery cell 20, thereby improving the reliability of the battery device 100. One of the first housing 11 and the second housing 12 is formed as the lower housing 10, and the other as the upper housing 10; their specific locations are not limited in this application.

[0136] For example Figures 4-5 As shown, a first receiving cavity 101 is formed inside the first housing 11, and a second receiving cavity 101 is formed inside the second housing 12. The first receiving cavity 101 and the second receiving cavity 101 are connected to each other to jointly define the receiving cavity 101. Multiple buffers 70 are respectively arranged between the side wall of the first receiving cavity 101 in the left and right directions and multiple battery cells 20.

[0137] In the above technical solution, by setting the first housing 11 and the second housing 12, the assembly of the battery device 100 can be simplified and the manufacturing convenience of the housing 10 can be improved. In addition, by arranging buffers 70 in the first housing 11 and the second housing 12 respectively, the buffering effect of the buffers 70 can be further increased and the reliability of the battery device 100 can be improved.

[0138] Secondly, embodiments of this application also provide an electrical device, including a battery device 100 according to the first aspect of this application.

[0139] In the above technical solution, by setting the battery device 100 of the first aspect embodiment, the overall performance of the power-consuming device is improved.

[0140] The following will refer to Figures 2-6 This application describes a battery device 100 according to a specific embodiment.

[0141] Reference Figure 2 The battery device 100 includes: a housing 10, multiple battery cells 20, an electrical connector 30, a reinforcing plate 40, a first adhesive layer 50, and a buffer 70.

[0142] The housing 10 includes a first housing 11 and a second housing 12. Specifically, the first housing 11 is the upper housing 10, and the second housing 12 is the lower housing 10. The first housing 11 is arranged on the upper side of the second housing 12 and covers the second housing 12 to form a receiving cavity 101. Multiple battery cells 20 are arranged in the receiving cavity 101, and the second housing 12 has a bottom plate 13.

[0143] The battery cell 20 has a terminal post, which is arranged on the side of the battery cell 20 facing the base plate 13; the electrical connection piece 30 is welded to the terminal post of the battery cell 20.

[0144] The reinforcing plate 40 is an insulating component. It is bonded to the side of the base plate 13 facing the multiple battery cells 20. Multiple reinforcing ribs 41 are formed on the reinforcing plate 40. The electrical connecting piece 30 is bonded to the reinforcing rib 41 through the first adhesive layer 50. Specifically, the reinforcing rib 41 is formed as a rib extending in the front-back direction. Multiple reinforcing ribs 41 are arranged at intervals in the left-right direction, and the cross-section of the reinforcing rib 41 perpendicular to its length direction is trapezoidal. The electrical connecting piece 30 is bonded to the upper end of the reinforcing rib 41.

[0145] The buffer element 70 extends in a strip shape along the length of the housing 10. There are four buffer elements 70, which are respectively arranged between the two side walls of the first housing 11 in the width direction and the multiple battery cells 20, and between the two side walls of the second housing 12 in the width direction and the multiple battery cells 20. The buffer element 70 is a cushioning foam.

[0146] Furthermore, the electrical connector 30 is welded to the terminal post of the battery cell 20 to form a first weld 60. In the horizontal projection plane, the projection of the starting end of the first weld 60 is arranged outside the projection of the first adhesive layer 50, and the length of the initial end of the first weld 60 extending out of the first adhesive layer 50 is greater than or equal to 1 mm.

[0147] The first adhesive layer 50 extends in a strip shape along the length of the reinforcing plate 40. In the width direction of the reinforcing plate 40, the width W of the first adhesive layer 50 satisfies: W=k(W1-2d), where W1 is the overlap width of the electrical connecting piece 30 and the reinforcing plate 40 in the width direction of the reinforcing plate 40, d is the length of the initial end of the first weld 60 extending out of the first adhesive layer 50, and k is an effective coefficient, where 0.8≤k≤0.95.

[0148] In the above technical solution, by setting the reinforcing plate 40 and the electrical connecting piece 30 to be fixedly connected, the phenomenon of torsional breakage of the electrical connecting piece 30 caused by the different amplitudes of multiple battery cells 20 during movement can be effectively prevented. At the same time, when the battery device 100 is subjected to a side impact, the side impact force is transmitted to multiple battery cells 20, and the impact force can be transmitted to the reinforcing plate 40 through the electrical connecting piece 30, and then to the base plate 13. In this way, the stress concentration at the connection position between the electrical connecting piece 30 and the terminal post can be reduced, thereby reducing the risk of breakage at the connection position between the electrical connecting piece 30 and the terminal post, thus reducing the risk of short circuit of the battery cells 20 and improving the reliability of the battery device 100.

[0149] 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 in that, include: The box (10) has a receiving cavity (101) inside and a bottom plate (13). Multiple battery cells (20) are arranged in the receiving cavity (101), each battery cell (20) having a terminal post arranged on the side of the battery cell (20) facing the base plate (13); Electrical connector (30) is connected to the terminal of the battery cell (20); A reinforcing plate (40) is fixed on the base plate (13) and located on the side of the base plate (13) facing the plurality of battery cells (20). The reinforcing plate (40) is fixedly connected to the electrical connecting piece (30).

2. The battery device according to claim 1, characterized in that, The reinforcing plate (40) has a plurality of reinforcing ribs (41) formed thereon, and the reinforcing plate (40) is fixedly connected to the electrical connecting piece (30) through the reinforcing ribs (41).

3. The battery device according to claim 2, characterized in that, In the direction from the battery cell (20) toward the base plate (13), the cross-sectional area of ​​the reinforcing rib (41) gradually increases.

4. The battery device according to claim 3, characterized in that, The cross-section of the reinforcing rib (41) perpendicular to its length direction is trapezoidal.

5. The battery device according to claim 1, characterized in that, Also includes: The first adhesive layer (50) is used to bond the electrical connecting piece (30) to the reinforcing plate (40).

6. The battery device according to claim 5, characterized in that, The electrical connector (30) is connected to the pole through the first weld (60). In the horizontal projection plane, part of the projection of the first weld (60) coincides with the projection of the first adhesive layer (50). The projection of the starting end of the first weld (60) is arranged outside the projection of the first adhesive layer (50).

7. The battery device according to claim 6, characterized in that, In the extension direction of the first weld (60), the initial end of the first weld (60) extends out of the first adhesive layer (50) by a length greater than or equal to 1 mm.

8. The battery device according to claim 6, characterized in that, The first adhesive layer (50) extends in a strip shape along the length direction of the reinforcing plate (40), and the width W of the first adhesive layer (50) in the width direction of the reinforcing plate (40) satisfies: W=k(W1-2d), Wherein, W1 is the overlap width of the electrical connecting piece (30) and the reinforcing plate (40) in the width direction of the reinforcing plate (40), d is the length of the initial end of the first weld (60) extending out of the first adhesive layer (50), and k is an effective coefficient, where 0.8≤k≤0.

95.

9. The battery device according to claim 6, characterized in that, The first adhesive layer (50) extends in a strip shape along the length direction of the reinforcing plate (40), and the width of the first adhesive layer (50) is 8mm-12mm in the width direction of the reinforcing plate (40).

10. The battery device according to claim 5, characterized in that, The electrical connector (30) is connected to the pole via a first weld (60), and the first weld (60) and the first adhesive layer (50) are arranged at intervals.

11. The battery device according to claim 8, characterized in that, In the extension direction of the first weld (60), the distance between the first weld (60) and the first adhesive layer (50) is greater than or equal to 1 mm.

12. The battery device according to claim 1, characterized in that, The reinforcing plate (40) is an insulating component.

13. The battery device according to claim 1, characterized in that, Also includes: A buffer (70) is arranged in the receiving cavity (101) and between the plurality of battery cells (20) and the side wall of the housing (10).

14. The battery device according to claim 13, characterized in that, The buffer element (70) extends in a strip shape along the length direction of the housing (10) and / or the width direction of the housing (10); or, The buffer (70) is formed in a ring around the circumference of the plurality of battery cells (20).

15. The battery device according to claim 13, characterized in that, The housing (10) includes a first housing (11) and a second housing (12), the first housing (11) and the second housing (12) cover each other and jointly define the receiving cavity (101), and there are multiple buffers (70), which are respectively arranged in the first housing (11) and the second housing (12).

16. An electrical appliance, characterized in that, include: The battery device according to any one of claims 1-15.

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