Battery device

Abstract

The application belongs to the technical field of batteries, and discloses a battery device. The battery device comprises a battery box, a battery module, a high-voltage box, a conductive connecting piece and a fastener. The battery module is arranged in the battery box; the high-voltage box is arranged in the battery box and located on one side of the battery module in a first direction; one end of the conductive connecting piece is electrically connected with the battery module, and the other end of the conductive connecting piece is provided with an extension part extending along the first direction, and the first direction is the length direction of the battery box; and the fastener extends along a second direction and is connected with the extension part and the high-voltage box, and the second direction is perpendicular to the first direction. The battery device provided by the application can have a higher energy density.

Description

Technical Field

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

[0002] A high-voltage box is embedded in the end plate of the battery box. The high-voltage box has a positive output port and a negative output port. After the multiple cells inside the battery box are electrically connected, they are connected to the high-voltage box via copper busbars. In related technologies, the copper busbars and the high-voltage box are connected by connecting strips. The connecting strips extend along the length of the entire battery box. Therefore, the battery box needs to reserve a large space along its length for the connecting strips, resulting in a large battery box length and consequently a lower energy density of the battery device. Utility Model Content

[0003] The purpose of this application is to provide a battery device to solve the technical problem of low energy density.

[0004] Based on the above concept, the technical solution adopted in this application is:

[0005] Battery device, including:

[0006] Battery box;

[0007] A battery module, wherein the battery module is disposed within the battery box;

[0008] A high-voltage box is disposed in the battery box and located on one side of the battery module in the first direction;

[0009] A conductive connector, one end of which is electrically connected to the battery module, and the other end of which is provided with an extension portion extending along a first direction, the first direction being the length direction of the battery box;

[0010] A fastener that extends along a second direction and connects to the extension and the high-voltage box, the second direction being perpendicular to the first direction.

[0011] The beneficial effects that the above technical solution can achieve are:

[0012] The high-voltage box and the battery module are electrically connected via a conductive connector. The conductive connector has an extension extending in a first direction to facilitate connection with the high-voltage box. The extension and the high-voltage box are connected by a fastener. The fastener extends in a second direction, which is either the height or width direction of the battery box. This ensures that the extension direction of the fastener is not the length direction of the battery box. Thus, when connecting the extension and the high-voltage box, the fastener can be manipulated between the battery module and the high-voltage box along the height or width direction of the battery box. The direction of fastener movement can be controlled by the second direction, so that the assembly of the fastener is not interfered with by the high-voltage box or the battery module. This facilitates the installation and removal of the fastener, and eliminates the need for a large installation space between the battery module and the high-voltage box, which is beneficial for improving the energy density of the battery device. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this application and these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the battery device provided in the embodiments of this application;

[0015] Figure 2 This is a first exploded view of the battery device provided in the embodiments of this application;

[0016] Figure 3 This is a partially enlarged cross-sectional view of the battery device provided in the embodiments of this application;

[0017] Figure 4 This is a schematic diagram of the high-voltage box provided in the embodiments of this application;

[0018] Figure 5 This is a first front view of a portion of the structure of the battery device provided in the embodiments of this application;

[0019] Figure 6 This is a schematic diagram of the battery device provided in this application embodiment when the high-voltage box is not shown;

[0020] Figure 7 This is a partial enlarged view of the battery device provided in the embodiments of this application;

[0021] Figure 8 This is a first structural schematic diagram of the conductive connector provided in an embodiment of this application;

[0022] Figure 9This is a schematic diagram of the second structure of the conductive connector provided in the embodiments of this application;

[0023] Figure 10 This is a second front view of a portion of the structure of the battery device provided in the embodiments of this application;

[0024] Figure 11 This is a front view of the battery device provided in the embodiments of this application;

[0025] Figure 12 This is a second exploded view of the battery device provided in the embodiments of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Battery box; 11. Through hole; 12. Base plate assembly; 13. Box body; 131. Flanged edge; 132. U-shaped shell; 133. Box side plate; 2. Battery module; 3. High voltage box; 31. Protrusion; 32. Positive terminal; 33. Negative terminal; 4. Conductive connector; 41. Extension; 42. First conductive section; 43. Second conductive section; 44. Third conductive section; 45. Positive conductive connector; 46. Negative conductive connector; 5. Fastener; 6. End plate; 7. Assembly cavity; 8. Insulating sleeve; X, First direction; Z, Second direction; Y, Third direction. Detailed Implementation

[0028] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of this application will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not all of them.

[0029] It should be understood that the phrase "an embodiment" or "one embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in one embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" 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. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. In the description of this embodiment, unless otherwise specified, "multiple" specifically refers to two or more.

[0033] In the description of this embodiment, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation. They 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, and therefore should not be construed as a limitation of this application. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or it can be located in between the component.

[0035] The technical solution of this application will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] In related technologies, the connecting strip connecting the high-voltage box extends along the length of the battery box, and the bolt used to connect the connecting strip and the high-voltage box also extends along the length of the battery box. Furthermore, a certain amount of space is required when tightening the bolts, and the battery box needs to reserve a large amount of space in the length direction, which results in a low energy density of the battery device.

[0037] Based on the above problems, this embodiment provides a battery device in which the space reserved for the components connecting the copper busbar and the high-voltage box can be smaller, so that the length of the battery box can be smaller, thereby improving the energy density of the battery device.

[0038] The battery device provided in this application embodiment can be applied in electrical devices, which 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.

[0039] For example, such as Figures 1 to 12 As shown, the battery device includes a battery box 1 and battery modules 2 disposed within the battery box 1. The battery box 1 is used to house the battery modules 2. Multiple battery cells with similar capacity and internal resistance are connected in series, parallel, or a combination thereof to form the battery module 2.

[0040] The battery box 1 provides a space for housing the battery module 2, and can adopt various structures. In some embodiments, the battery box 1 may include a base plate assembly 12 and a box body 13, with the base plate assembly 12 and the box body 13 covering each other, and the base plate assembly 12 and the box body 13 together defining a space for housing the battery module 2. Optionally, to ensure a sealing effect, the base plate assembly 12 and the box body 13 may both be provided with mating flanges at their edges. The box body 13 may be a hollow structure with one end open, and the base plate assembly 12 may be a plate-like structure, with the base plate assembly 12 covering the open side of the box body 13 so that the base plate assembly 12 and the box body 13 together define the housing space; the base plate assembly 12 and the box body 13 may also both be hollow structures with one side open, with the open side of the base plate assembly 12 covering the open side of the box body 13. Of course, the battery box 1 formed by the base plate assembly 12 and the box body 13 can be of various shapes, such as a cylinder, a cuboid, etc.

[0041] Optionally, in the battery device, there can be one or more battery modules 2, and each battery module 2 can include multiple battery cells. These battery cells can be connected in series, parallel, or a combination thereof; a combination thereof means that some battery cells are connected in series while others are connected in parallel. The battery cells can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the battery cells is housed within the battery case 1. Alternatively, the battery device can also consist of multiple battery cells first connected in series, parallel, or a combination thereof to form battery modules 2, and then these battery modules 2 are connected in series, parallel, or a combination thereof to form a whole, which is then housed within the battery case 1. The battery device may also include other structures; for example, it may include a busbar (not shown in the figure) for electrical connection between the multiple battery modules 2.

[0042] The battery cell 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 module 2 can be cylindrical, flat, cuboid, or other shapes.

[0043] Battery module 2 may include multiple battery cells, which can be connected in series, parallel, or a combination thereof to form battery module 2. These battery modules 2 can then be connected in series, parallel, or a combination thereof to form a whole. Battery modules 2 are generally classified into three types according to their packaging method: cylindrical battery module 2, cuboid battery module 2, and pouch battery module 2. This application embodiment is not limited to these types. However, for the sake of brevity, the following embodiments will use cuboid battery module 2 as an example for illustration.

[0044] It should be noted that a battery cell refers to the smallest unit that makes up a battery device. A battery cell includes an end cap, a housing, and electrode assemblies. The end cap is a component that closes onto the opening of the housing to isolate the internal environment of the battery cell from the external environment. Functional components such as electrode terminals may be provided on the end cap. The electrode terminals can be used to electrically connect with the electrode assemblies for outputting or inputting electrical energy into the battery module 2. In some embodiments, the end cap may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery module 2 reaches a threshold. In some embodiments, an insulating member may also be provided on the inside of the end cap, which can be used to isolate the electrical connection components inside the housing from the end cap to reduce the risk of short circuits. For example, the insulating member may be plastic, rubber, etc. The housing is an assembly used to cooperate with the end cap to form the internal environment of the battery cell, wherein the formed internal environment can be used to accommodate electrode assemblies, electrolyte, and other components. The housing and the end cap may be independent components, and an opening may be provided on the housing, with the end cap closing the opening to form the internal environment of the battery cell. The housing can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the electrode assembly. The housing can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0045] Electrode assemblies are the components within a single battery cell where electrochemical reactions occur. A casing may contain one or more electrode assemblies. Electrode assemblies are primarily formed by winding or stacking positive and negative electrode plates, typically with a separator between them. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly, while the portions without active material each form a tab. The positive and negative tabs can be located together at one end of the main body or separately at both ends. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0046] When battery devices are used in electric vehicles, a high-voltage box 3 is typically installed to ensure the connection between the battery and the vehicle's electrical equipment. The high-voltage box 3 contains fuses to provide final overcurrent protection. It also serves to prevent live operation and high-voltage exposure risks through interlocking, prevent leakage accidents through insulation monitoring, avoid surge current damage to critical components through pre-charging circuits, and efficiently and reliably distribute battery energy to various high-voltage electrical components as needed, ensuring the normal operation of the vehicle's powertrain and accessories. The high-voltage box 3 can also collect key parameters of the high-voltage system (voltage, current, temperature, insulation status, interlock status) and transmit them to the upper-level controller (BMS / VCU), providing decision-making basis for the vehicle's energy management, fault diagnosis, and safety strategies. The high-voltage box 3 highly integrates dispersed relays, fuses, connectors, busbars, and other components into a sealed metal housing, saving space, reducing weight, optimizing layout, and providing a certain level of electromagnetic shielding and protection (such as IP67 dust and water resistance).

[0047] like Figure 1 and Figure 2 As shown, in this embodiment, the high-voltage box 3 is fixedly disposed on the battery box 1 and located on one side of the battery module 2 in the first direction X. Exemplarily, in this embodiment, the high-voltage box 3 is disposed on one side wall of the housing 13 in the first direction X; that is, the high-voltage box 3 is connected to the side wall of the housing 13. Here, the first direction X is the length direction of the battery box 1.

[0048] In some embodiments, the conductive connector 4 serves as the lead-out structure of the battery module 2, such as... Figure 2 As shown, one end of the conductive connector 4 is electrically connected to the battery module 2. For example, the conductive connector 4 can be electrically connected to a busbar or copper busbar. The other end of the conductive connector 4 is provided with an extension 41 extending along the first direction X. By setting the extension 41 to extend along the first direction X, it is easy to electrically connect the conductive connector 4 to the high-voltage box 3. Fasteners 5 are used to connect the extension 41 of the conductive connector 4 and the high-voltage box 3, such as... Figure 3 As shown, the fastener 5 extends along the second direction Z and connects to the extension portion 41 and the high-voltage box 3. The second direction Z is perpendicular to the length direction of the battery box 1; that is, the second direction Z can be either the height direction or the width direction of the battery box 1. This embodiment uses the second direction Z as the height direction of the battery box 1 as an example for explanation. For the case where the second direction Z is the width direction of the battery box 1, please refer to the corresponding structure when the second direction Z is the height direction of the battery box 1, which will not be detailed here.

[0049] In the battery device provided in this embodiment, the high-voltage box and the battery module 2 are electrically connected through a conductive connector 4. The conductive connector 4 is provided with an extension 41 extending along a first direction X to facilitate connection with the high-voltage box. The extension 41 and the high-voltage box are connected by a fastener 5. The extension direction of the fastener 5 is a second direction Z, which is either the height or width direction of the battery box 1. This ensures that the extension direction of the fastener 5 is not the length direction of the battery box 1. Thus, when connecting the extension 41 and the high-voltage box, the fastener 5 can be manipulated between the battery module 2 and the high-voltage box along the height or width direction of the battery box 1. The direction in which the fastener 5 moves can be the second direction Z, so that the assembly of the fastener 5 will not be interfered with by the high-voltage box or the battery module 2. This facilitates the installation and disassembly of the fastener 5, and a large installation space is not required between the battery module 2 and the high-voltage box, which is beneficial to improving the energy density of the battery device.

[0050] It should be noted that the length direction of the extension 41 is the first direction X, and the thickness direction of the extension 41 can be either the width direction of the battery box 1 or the height direction of the battery box 1; this embodiment does not limit this. The extension direction of the fastener 5 is the same as the thickness direction of the extension 41, so that it can penetrate the extension 41 along the thickness direction of the extension 41 and connect to the high-voltage box 3. When the thickness direction of the extension 41 is the width direction of the battery box 1, the extension direction of the fastener 5 is the width direction of the battery box 1; when the thickness direction of the extension 41 is the height direction of the battery box 1, the extension direction of the fastener 5 is the height direction of the battery box 1.

[0051] In at least one possible implementation, the fastener 5 can be a bolt, the high-voltage box 3 is provided with a screw hole, the extension 41 is provided with a through hole, the bolt passes through the through hole and is screwed into the screw hole, and the bolt nut tightly abuts against the extension 41, thereby realizing the electrical connection between the extension 41 and the high-voltage box 3. Of course, it is understood that the fastener 5 can also be a stud, a fixing post, or other components, and the connection between it and the high-voltage box 3 is not limited to screwing, but can also be snap-fit, adhesive, etc., which are not limited in this embodiment.

[0052] In some implementations, such as Figure 4 As shown, the high-voltage box 3 has a protrusion 31 on the side facing the battery module 2, and the fastener 5 connects the extension 41 and the protrusion 31. By setting the protrusion 31, the protrusion 31 and the extension 41 can be parallel, so that there is a large contact area between the extension 41 and the protrusion 31, thereby increasing the connection area and ensuring the strength and stability of the connection.

[0053] Optionally, the protrusion 31 can be block-shaped or plate-shaped, and the specific shape can be flexibly selected according to the needs. This embodiment does not limit this.

[0054] In some alternative embodiments, such as Figure 3 As shown, the extension 41 is located on one side of the protrusion 31 in the second direction Z. With this arrangement, the extension 41 and the protrusion 31 are connected in a surface-to-surface contact manner in the second direction Z. While increasing the connection area, the protrusion 31 can support the extension 41, thereby supporting the entire conductive connector 4 and ensuring the stability and firmness of the conductive connector 4.

[0055] Further optionally, in this embodiment, the second direction Z is the height direction of the battery box 1. The battery box 1 has a bottom wall and a top wall disposed opposite to each other in the second direction Z, wherein the bottom wall and the top wall are connected by a side wall, the bottom wall being disposed at the bottom of the side wall and the top wall being disposed at the top of the side wall. In this embodiment, as shown... Figure 3 As shown, the extension 41 is located on the side of the protrusion 31 facing away from the bottom wall of the battery box 1, that is, the extension 41 is located on the top surface of the protrusion 31. With this arrangement, since the busbar or copper busbar of the battery module 2 is usually located on the top of the battery module 2, close to the top wall of the battery box 1, connecting the extension 41 to the top surface of the protrusion 31 shortens the length of the conductive connector 4. This allows the conductive connector 4 to achieve electrical connection with the high-voltage box 3 without being excessively long, thereby reducing the resistance of the conductive connector 4 and lowering its energy loss. Furthermore, the protrusion 31 better supports the extension 41 and the entire conductive connector 4, improving the stability of the conductive connector 4 and thus ensuring the stability and reliability of energy transmission.

[0056] In at least one possible implementation, such as Figure 5 As shown, the distance between the extension 41 and the bottom wall of the battery box 1 is 'a' millimeters, with 'a' ranging from 80mm to 260mm. When the minimum distance between the extension 41 and the bottom wall of the battery box 1 meets this range, the extension 41 and the bottom wall of the battery box 1 have high insulation performance, reducing the risk of short circuit between the battery box 1 and the extension 41, and improving the safety and reliability of the battery device. The minimum distance between the extension 41 and the bottom wall of the battery box 1 cannot be too large. If it is too large, the high-voltage box 3 will be placed close to the top of the battery box 1, or even protrude from the top of the battery box 1, increasing the space occupied by the entire battery device in the height direction, which is not conducive to improving the energy density of the battery device. The minimum distance between the extension 41 and the bottom wall of the battery box 1 cannot be too small. If it is too small, the extension 41 will easily break down and short-circuit with the bottom wall of the battery box 1, leading to a safety accident. For example, the value of 'a' millimeters can be any value or a range between any two values, such as 80mm, 90mm, 100mm, 110mm, 130mm, 150mm, 180mm, 200mm, 220mm, 240mm, 250mm, 260mm, etc. This embodiment does not limit this value.

[0057] In other alternative embodiments, the protrusion 31 may also be provided with a slot, into which the extension 41 may be inserted to achieve a stable and reliable connection between the extension 41 and the protrusion 31.

[0058] In some alternative embodiments, such as Figure 1 As shown, the high-voltage box 3 is located on the outer wall of the battery box 1, meaning it is not located inside the battery box 1, which facilitates the connection between the high-voltage box 3 and external devices. Figure 6 As shown, the battery box 1 is provided with a through hole 11, and the protrusion 31 is provided through the through hole 11. The protrusion 31 extends into the interior of the battery box 1, which facilitates electrical connection with the extension 41. This allows the extension 41 to be located inside the battery box 1 without having to extend out of the battery box 1, thereby reducing the risk of short circuit with the battery box 1 and improving the safety and reliability of the battery device.

[0059] In one or more embodiments of this application, such as Figure 2 and Figure 5 As shown, the battery box 1 is provided with an end plate 6, which is used for limiting and fastening the battery module 2. Specifically, it fastens and limits the individual battery cells of the battery module 2 and restricts the movement of the battery module 2 within the battery box 1.

[0060] In some embodiments, the end plate 6 can be made of plastic materials such as nylon, nylon and fiberglass, or conventional metal materials such as aluminum and aluminum alloy. The end plate 6 can be an injection molded part or a die-cast part.

[0061] For example, such as Figure 12 As shown, an assembly cavity 7 is formed between the end plate 6 and the battery box 1. The assembly cavity 7 is located on one side of the battery module 2 in the first direction X. The extension 41, fastener 5, and at least part of the conductive connector 4 are all located within the assembly cavity 7. In this embodiment, the size of the assembly cavity 7 in the first direction X does not need to be designed to be too large, so that the overall volume of the battery box 1 will not be too large. By setting the end plate 6, the extension 41 and fastener 5 can be prevented from touching the battery cells. This achieves protection for the battery module 2.

[0062] In this embodiment, the conductive connector 4 can be fixedly mounted on the end plate 6 to secure the conductive connector 4 within the battery box 1 and prevent it from shaking inside the battery box 1. In some embodiments, one end of the conductive connector 4 that is electrically connected to the battery module 2 is fixedly mounted on the end plate 6, and the middle part of the conductive connector 4 is located in the assembly cavity 7 to make full use of the space in the assembly cavity 7 while minimizing the space occupied on the top of the battery module 2.

[0063] In some alternative implementations, such as Figure 7As shown, the distance between the extension 41 and the end plate 6 in the first direction X is b mm, where b mm is greater than or equal to 15 mm. When the minimum distance between the extension 41 and the end plate 6 in the first direction X is greater than or equal to 15 mm, it indicates that there is a certain gap between the portion of the conductive connector 4 located within the assembly cavity 7 and the end plate 6. This gap allows for the passage of other components (facilitating wires), thereby improving the compactness of the components within the assembly cavity 7. Furthermore, the dimensions of the extension 41 and the end plate 6 should not be too large, thus preventing the assembly cavity 7 from becoming too large in the first direction X, which is beneficial for the miniaturization of the battery box 1. The distance between the extension 41 and the end plate 6 in the first direction X cannot be too small; if the end plate 6 is made of metal, this would increase the risk of a short circuit. Conversely, the distance between the extension 41 and the end plate 6 in the first direction X cannot be too large either; an excessively large distance would result in a large assembly cavity 7 in the first direction X, leading to a longer length of the battery box 1 in the first direction X, which is detrimental to improving the energy density of the battery device. For example, the distance between the extension 41 and the end plate 6 in the first direction X can be 15mm, 16mm, 17mm, 18mm, 19mm, etc.

[0064] In one or more embodiments of this application, such as Figure 8 and Figure 9 As shown, the extension 41 is rectangular, and the length direction of the extension 41 is the first direction X. With this configuration, the structure of the extension 41 is more conventional and easier to process and manufacture.

[0065] In some embodiments, such as Figure 7 As shown, the length of the extension 41 is c millimeters, and the value of c millimeters ranges from 20mm to 60mm. When the length of the extension 41 meets this range, it is neither too long nor too short, ensuring proper fit with the fastener 5 without occupying excessive space in the first direction X. The length of the extension 41 cannot be too large, as this would occupy too much space in the first direction X, thus increasing the size of the battery box 1 in that direction. The length of the extension 41 cannot be too small, as this would reduce the connection area with the fastener 5 and the high-voltage box 3, making it prone to disconnection and affecting connection strength and reliability. For example, the length of the extension 41 can be any value or a range between any two values, such as 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, or 60mm.

[0066] In some embodiments, the width of the extension 41 is d mm, where d mm ranges from 15 mm to 60 mm. When the width of the extension 41 meets this range, the extension 41 and the high-voltage box 3 can have a larger connection area, thereby ensuring connection stability and reliability. The width of the extension 41 cannot be too large, as this will cause interference with other components and increase the internal resistance of the extension 41. The width of the extension 41 cannot be too small, as this will reduce the connection area with the fastener 5 and the high-voltage box 3, making it easy for the connection to break, affecting connection strength and reliability. For example, the width of the extension 41 can be any value or a range between any two values, such as 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, or 60 mm.

[0067] In at least one embodiment, the thickness of the extension 41 is e millimeters, where e millimeters range from 2 mm to 6 mm. When the thickness of the extension 41 meets this range, the extension 41 has high structural strength, reducing the risk of breakage. The thickness of the extension 41 cannot be too large, as this increases its internal resistance, requires a longer fastener 5, and increases the pressure on the high-voltage box 3. The thickness of the extension 41 cannot be too small, as this results in lower structural strength, making it prone to breakage and affecting the stability and reliability of power transmission. For example, the thickness of the extension 41 can be any value or a range between any two values, such as 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 5 mm, etc.

[0068] In one or more embodiments of this application, the extension 41 and the conductive connector 4 are an integral structure, and the extension 41 can be formed by bending, which facilitates the processing and manufacturing of the extension 41. Designing the extension 41 and the conductive connector 4 as an integral structure can improve the overall structural strength of the conductive connector 4, reduce the risk of breakage, and also reduce the internal resistance of the connection, thereby reducing the energy consumption of the conductive connector 4.

[0069] In at least one possible implementation, such as Figure 8 As shown, the conductive connector 4 is covered with an insulating sleeve 8. The insulating sleeve 8 serves to insulate the conductive connector 4 from other components, further reducing the risk of short circuits between the conductive connector 4 and other components, and improving the safety and reliability of the battery device. It should be noted that the extension 41 protrudes from the insulating sleeve 8 to facilitate electrical connection with the high-voltage box 3.

[0070] Optionally, the insulating sleeve 8 may be made of an insulating material, such as rubber, silicone, or plastic. This embodiment does not limit the material used.

[0071] The conductive connector 4 can have various specific structures. For example, this embodiment provides a conductive connector 4, such as... Figure 9 As shown, the conductive connector 4 includes a first conductive segment 42, a second conductive segment 43, and a third conductive segment 44 connected in sequence. The first conductive segment 42 extends along a first direction X and is electrically connected to the battery module 2; that is, the end of the first conductive segment 42 opposite to the second conductive segment 43 is electrically connected to the busbar of the battery module 2. Since the busbar typically extends along the first direction X, setting the first conductive segment 42 to extend along the first direction X facilitates the electrical connection between the conductive connector 4 and the busbar. The second conductive segment 43 extends along a third direction Y, and the third conductive segment 44 extends along a second direction Z and is electrically connected to the extension portion 41. It should be noted that the third direction Y is perpendicular to both the first direction X and the second direction Z. In some embodiments, the third direction Y is the width direction of the battery box 1. Optionally, a fourth conductive segment may be provided between the first conductive segment 42 and the second conductive segment 43 to serve as a transition segment to change the extension direction. In some embodiments, each corner of the conductive connector 4 adopts an arc structure.

[0072] In some embodiments, the length of the second conductive segment 43 is greater than the length of the first conductive segment 42 and greater than the length of the third conductive segment 44. Since the busbar connected to the battery module 2 is usually located at the edge of the battery module 2 in the third direction Y, while the high voltage box 3 is usually located in the middle of the battery box 1 in the third direction Y, a longer second conductive segment 43 is required to achieve the electrical connection between the busbar and the high voltage box 3.

[0073] In one or more embodiments of this application, the length of the first conductive segment 42 can be set as needed. For example, the first conductive segment 42 can extend from one end of the battery module 2 to the other end of the battery module 2 along the first direction X. This embodiment does not limit this.

[0074] In at least one possible implementation, please continue to see Figure 9 The thickness direction of the first conductive segment 42 is the second direction Z, which makes the space occupied by the first conductive segment 42 in the second direction Z smaller, which is beneficial to the miniaturization of the battery box 1 in the second direction Z. The thickness direction of the second conductive segment 43 and the third conductive segment 44 is the first direction X, which makes the space occupied by the second conductive segment 43 and the third conductive segment in the first direction X smaller, and makes full use of the space in the height and width directions. This allows the size of the assembly cavity 7 in the first direction X to be as small as possible, thereby reducing the overall length of the battery box 1 and improving the energy density of the battery box 1.

[0075] In some optional embodiments, the area of ​​the extension 41 is S1 square millimeters, and the contact area between the extension 41 and the fastener 5 is S2 square millimeters. The value of S2 / S1 ranges from 0.3 to 0.9. When the value of S2 / S1 is within this range, the proportion of the contact area between the extension 41 and the fastener 5 to the total area of ​​the extension 41 is neither too large nor too small, ensuring the firmness of the connection between the high-voltage box 3 and the extension 41 and reducing the risk of disconnection. The value of S2 / S1 cannot be too small, as this reduces the binding effect of the fastener 5 on the extension 41, making it easier for the extension 41 and the high-voltage box 3 to loosen, thus affecting the connection quality and effect, and potentially causing intermittent connections. The value of S2 / S1 cannot be too large, as this affects the heat dissipation of the extension 41, leading to overheating and affecting the safety of the battery device. For example, the value of S2 / S1 can be any value or a range between any two values, such as 0.3, 0.4, 0.45, 0.5, 0.6, 0.7, 0.8, 0.9, etc. This embodiment does not limit this.

[0076] In one or more embodiments of this application, such as Figure 8 As shown, two conductive connectors 4 are provided, namely a positive conductive connector 45 and a negative conductive connector 46. In some embodiments, the positive conductive connector 45 and the negative conductive connector 46 are spaced apart in the third direction Y, thereby making full use of the space of the battery box 1 in the third direction Y. The battery module 2 has a positive electrode and a negative electrode. The positive conductive connector 45 is electrically connected to the positive electrode of the battery module 2, and the negative conductive connector 46 is electrically connected to the negative electrode of the battery module 2.

[0077] For example, such as Figure 4 As shown, the high-voltage box 3 has a positive terminal 32 and a negative terminal 33. The positive conductive connector 45 is electrically connected to the positive terminal 32, and the negative conductive connector 46 is electrically connected to the negative terminal 33. Thus, the positive terminal of the battery module 2 is electrically connected to the positive terminal 32 of the high-voltage box 3 through the positive conductive connector 45, and the negative terminal of the battery module 2 is electrically connected to the negative terminal 33 of the high-voltage box 3 through the negative conductive connector 46.

[0078] It should be noted that the specific structures of the positive conductive connector 45 and the negative conductive connector 46 may be the same or different, and this embodiment does not limit this. However, both the positive conductive connector 45 and the negative conductive connector 46 are provided with an extension 41. When the high-voltage box 3 is provided with a protrusion 31, there are two protrusions 31, one of which is electrically connected to the positive conductive connector 45, and the other protrusion 31 is electrically connected to the negative conductive connector 46. Optionally, one of the two protrusions 31 is a block structure, and the other is a plate structure.

[0079] In at least one possible implementation, such as Figure 10 As shown, the extension 41 of the positive conductive connector 45 and the extension 41 of the negative conductive connector 46 are offset in the second direction Z. That is, the extension 41 of the positive conductive connector 45 and the extension 41 of the negative conductive connector 46 have a first distance L in the second direction Z. This arrangement can match the positions of the two protrusions 31 on the high-voltage box 3, thereby improving the ease of connection and preventing mistaken connection due to the high-voltage box 3 being placed backwards.

[0080] In one or more embodiments of this application, two positive terminals 32 are provided, namely a charging positive terminal and a discharging positive terminal. The charging positive terminal is used when an external power source charges the battery device; that is, when the battery device is charging, the charging positive terminal is connected to the positive conductive connector 45. The discharging positive terminal is used when the battery device discharges to an external electrical device; that is, when the battery device is discharging, the discharging positive terminal is connected to the positive conductive connector 45.

[0081] In some embodiments, the high-voltage box 3 is equipped with a discharge fuse (not shown in the figure) and a charging fuse (not shown in the figure). The charging fuse is electrically connected between the charging positive terminal and the positive conductive connector 45, and the discharge fuse is electrically connected between the discharging positive terminal and the positive conductive connector 45. By providing the charging fuse and the discharge fuse, the temperature rise of the high-voltage box during operation can be effectively reduced, thereby ensuring the normal use of the high-voltage box and extending its service life.

[0082] In at least one embodiment, the installation direction of the discharge fuse is perpendicular to the installation direction of the charging fuse; that is, the length direction of the discharge fuse is perpendicular to the length direction of the charging fuse. This arrangement can reduce the temperature rise of the entire high-voltage box to a certain extent, and the arrangement of the charging and discharge fuses within the high-voltage box 3 is more reasonable, making full use of the internal space and improving the structural compactness.

[0083] It should be noted that a fuse is a one-time overcurrent protection device that cuts off a faulty circuit by melting itself. Specifically, when the current exceeds the rated value but is not very large, heat will gradually accumulate. When it reaches a certain level and time, the fuse element will melt. When the current increases sharply, several times or even tens of times the normal current, the huge heat will cause the fuse element to vaporize instantly, generate an electric arc and extinguish it quickly, thereby quickly cutting off the circuit.

[0084] In some alternative implementations, the charging fuse can be directly connected to the positive charging terminal, or it can be connected via a copper busbar. The copper busbar can effectively increase the heat dissipation area, thereby reducing the risk of overheating. The discharge fuse can also be directly connected to the positive discharge terminal or connected via a copper busbar; this embodiment does not limit this connection.

[0085] In at least one possible implementation, the battery box 1 and the base plate assembly 12 can be connected in various ways. This embodiment provides the following two connection methods as an example.

[0086] In one connection method between the battery box 1 and the base plate assembly 12, such as Figure 11 and Figure 12 As shown, the bottom of the housing 13 is provided with a flange 131 extending along the width direction of the housing 13, wherein the flange 131 is connected to the base plate assembly 12. By providing the flange 131, the connection area between the housing 13 and the base plate assembly 12 can be increased, thereby improving the connection strength. In this embodiment, the flange 131 is connected to the top surface of the base plate assembly 12, specifically by multiple bolts.

[0087] In one connection method between the battery box 1 and the base plate assembly 12, the bottom of the box body 13 is provided with an extension (not shown in the figure) extending along the height direction of the box body 13. That is, the extension direction of the extension is the same as the extension direction of the side wall of the box body 13. The extension is connected to the base plate assembly 12. By providing the extension, the connection area between the box body 13 and the base plate assembly 12 can be increased, thereby improving the connection reliability. In this embodiment, the extension can be connected to the outer peripheral surface of the base plate assembly 12, specifically through multiple bolts. The extension method ensures that the connection between the box body 13 and the base plate assembly 12 does not occupy the space on the top surface of the base plate assembly 12, thereby increasing the volume of the accommodating space formed by the box body 13 and the base plate assembly 12, and thus improving the energy density of the battery device.

[0088] In at least one possible implementation, such as Figure 12 As shown, the housing 13 in this embodiment may include a U-shaped shell 132 and a side panel 133. Both the U-shaped shell 132 and the side panel 133 may have flanges 131 or extensions; this embodiment does not limit this. In this embodiment, the side panel 133 is disposed at both ends of the U-shaped shell 132 in the first direction X and connected to the U-shaped shell 132, thereby forming a housing 13 with an opening. One of the side panels 133 cooperates with the end plate 6 to form an assembly cavity 7, and the through hole 11 of the battery box 1 is formed on the side panel 133.

[0089] Obviously, the above embodiments of this application are merely examples for clear illustration and are not intended to limit the implementation of this application. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A battery device, characterized in that, include: Battery box (1); Battery module (2), wherein the battery module (2) is disposed inside the battery box (1); High voltage box (3), the high voltage box (3) is disposed in the battery box (1) and located on one side of the battery module (2) in the first direction (X); A conductive connector (4) is provided. One end of the conductive connector (4) is electrically connected to the battery module (2). The other end of the conductive connector (4) is provided with an extension (41) extending along a first direction (X). The first direction (X) is the length direction of the battery box (1). Fastener (5) extends along a second direction (Z) and is connected to the extension (41) and the high-voltage box (3), the second direction (Z) being perpendicular to the first direction (X).

2. The battery device according to claim 1, characterized in that, The high-voltage box (3) has a protrusion (31) on the side facing the battery module (2), and the fastener (5) connects the extension (41) and the protrusion (31).

3. The battery device according to claim 2, characterized in that, The extension (41) is provided on one side of the protrusion (31) in the second direction (Z).

4. The battery device according to claim 3, characterized in that, The extension (41) is located on the side of the protrusion (31) away from the bottom wall of the battery box (1).

5. The battery device according to claim 2, characterized in that, The high-voltage box (3) is disposed on the outer wall of the battery box (1), and the battery box (1) is provided with a through hole (11). The protrusion (31) is disposed through the through hole (11).

6. The battery device according to claim 1, characterized in that, The distance between the extension (41) and the bottom wall of the battery box (1) is a mm, and the value of a mm ranges from 80 mm to 260 mm.

7. The battery device according to claim 1, characterized in that, The battery box (1) is provided with an end plate (6), and an assembly cavity (7) is formed between the end plate (6) and the battery box (1). The assembly cavity (7) is located on one side of the battery module (2) in the first direction (X), where the first direction (X) is the length direction of the battery box (1). The extension (41) and the fastener (5) are both located in the assembly cavity (7).

8. The battery device according to claim 7, characterized in that, The distance between the extension (41) and the end plate (6) in the first direction (X) is b mm, where b mm is greater than or equal to 15 mm.

9. The battery device according to claim 1, characterized in that, The extension (41) is rectangular, and the length direction of the extension (41) is the first direction (X). The length of the extension (41) is c mm, and the value of c mm is in the range of 20 mm to 60 mm; and / or, the width of the extension (41) is d mm, and the value of d mm is in the range of 15 mm to 60 mm; and / or, the thickness of the extension (41) is e mm, and the value of e mm is in the range of 2 mm to 6 mm.

10. The battery device according to claim 1, characterized in that, The extension (41) and the conductive connector (4) are an integral structure.

11. The battery device according to claim 1, characterized in that, The conductive connector (4) is covered with an insulating sleeve (8), and the extension (41) is exposed through the insulating sleeve (8).

12. The battery device according to claim 1, characterized in that, The conductive connector (4) includes a first conductive segment (42), a second conductive segment (43), and a third conductive segment (44) connected in sequence. The first conductive segment (42) extends along the first direction (X) and is electrically connected to the battery module (2). The second conductive segment (43) extends along the third direction (Y). The third conductive segment (44) extends along the second direction (Z) and is electrically connected to the extension portion (41). The length of the second conductive segment (43) is greater than the length of the first conductive segment (42) and greater than the length of the third conductive segment (44). The third direction (Y) is perpendicular to both the first direction (X) and the second direction (Z).

13. The battery device according to claim 12, characterized in that, The thickness direction of the first conductive segment (42) is the second direction (Z), and the thickness directions of the second conductive segment (43) and the third conductive segment (44) are both the first direction (X).

14. The battery device according to claim 1, characterized in that, The conductive connector (4) has two parts, namely a positive conductive connector (45) and a negative conductive connector (46). The positive conductive connector (45) is electrically connected to the positive terminal of the battery module (2), and the negative conductive connector (46) is electrically connected to the negative terminal of the battery module (2). The high voltage box (3) has a positive terminal (32) and a negative terminal (33). The positive conductive connector (45) is electrically connected to the positive terminal (32), and the negative conductive connector (46) is electrically connected to the negative terminal (33).

15. The battery device according to claim 14, characterized in that, The extension (41) of the positive conductive connector (45) and the extension (41) of the negative conductive connector (46) are offset in the second direction (Z).

16. The battery device according to claim 14, characterized in that, The positive terminal (32) has two parts, namely a charging positive terminal and a discharging positive terminal. The high voltage box (3) is provided with a discharging fuse and a charging fuse. The charging fuse is connected between the charging positive terminal and the positive conductive connector (45), and the discharging fuse is connected between the discharging positive terminal and the positive conductive connector (45).

17. The battery device according to claim 16, characterized in that, The installation direction of the discharge fuse is perpendicular to the installation direction of the charging fuse.

18. The battery device according to claim 1, characterized in that, The area of ​​the extension (41) is S1 square millimeters, and the contact area between the extension (41) and the fastener (5) is S2 square millimeters, wherein the value of S2 / S1 ranges from 0.3 to 0.

9.

19. The battery device according to claim 1, characterized in that, The battery box (1) includes a base plate assembly (12) and a box body (13) connected to the base plate assembly (12). The box body (13) and the base plate assembly (12) are connected to each other to form a receiving space. The battery module (2) is disposed in the receiving space. The high voltage box (3) is connected to the side wall of the box body (13). The bottom of the box (13) is provided with a flange (131) extending along the width direction of the box (13), and the flange (131) is connected to the base plate assembly (12).

20. The battery device according to claim 1, characterized in that, The battery box (1) includes a base plate assembly (12) and a box body (13) connected to the base plate assembly (12). The box body (13) and the base plate assembly (12) are connected to each other to form a receiving space. The battery module (2) is disposed in the receiving space. The high voltage box (3) is connected to the side wall of the box body (13). The bottom of the box (13) is provided with an extension extending along the height direction of the box (13), and the extension is connected to the base plate assembly (12).

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