Battery management unit, battery device, energy storage device and power utilization device

Abstract

The embodiment of the utility model provides a battery management unit, a battery device, an energy storage device and an electric device. The battery device comprises the battery management unit. The battery management unit comprises a circuit control board, a protection box, a support and a fastener. The circuit control board is provided with a mounting hole penetrating in the first direction. The protection box is provided with an avoiding hole, the avoiding hole communicates with the mounting cavity and the exterior of the protection box, and the mounting hole communicates with the exterior of the protection box through the avoiding hole. At least one of the support and the fastening piece is arranged in the mounting hole in a penetrating mode through the receding hole, a part of the circuit control board is located between the fastening piece and the support, and at least one of the circuit control board and the support can abut against the fastening piece so that the thread screwing-in depth of the support and the fastening piece can reach the maximum value. According to the battery device provided by the embodiment of the invention, the circuit control board can be fixed without a protection box, so that the influence of the torsion of the fastener and the bracket on the protection box can be reduced or even eliminated.

Description

Technical Field

[0001] Embodiments of the present utility model relate to the technical field of batteries, and particularly to a battery management unit, a battery device, an energy storage device, and an electrical device. Background Art

[0002] A battery management unit is provided in a battery device. The battery management unit is used for electrically connecting with battery cells, sensors and other electrical components in the battery device to control the battery device to realize charge and discharge functions, and monitor the working state of the battery device.

[0003] The battery management unit includes a protective box and a circuit control board. The circuit control board is electrically connected with the electrical components, and the protective box is coated outside the circuit control board to protect the circuit control board.

[0004] In the related art, generally, fasteners such as screws and bolts are used to fix the position of the protective box in a threaded fit manner. However, the protective box itself is generally made of plastic material and has a small wall thickness, and is prone to deformation under the torque applied by the threaded fit, which easily causes the fixed fit between the protective box and the fastener to fail, and then causes the protective box to displace, which has a negative effect on the normal use of the circuit control board. Summary of the Utility Model

[0005] In view of this, embodiments of the present utility model are expected to provide a battery management unit, a battery device, an energy storage device, and an electrical device that are beneficial to reducing the adverse effects of the torque of the threaded fit of the fastener on the structure of the protective box.

[0006] To achieve the above object, the technical solution of the embodiments of the present utility model is realized as follows:

[0007] Embodiments of the present utility model provide a battery device, the battery device includes a battery management unit, and the battery management unit includes:

[0008] A circuit control board, provided with a mounting hole penetrating along a first direction;

[0009] A protective box, provided with a mounting cavity and an avoidance hole. At least part of the circuit control board is located in the mounting cavity. The avoidance hole communicates the mounting cavity with the outside of the protective box, and the mounting hole communicates with the outside of the protective box through the avoidance hole;

[0010] A bracket;

[0011] A fastener is threadedly matched with the bracket, at least one of the bracket and the fastener is inserted into the mounting hole through the avoidance hole, a portion of the circuit control board is located between the fastener and the bracket along the first direction, and at least one of the circuit control board and the bracket can abut against the fastener along the first direction so that the threaded screwing depth of the bracket and the fastener reaches a maximum value.

[0012] The battery device in the embodiment of the present application achieves a maximum screw-in depth of the bracket and the fastener by directly contacting at least one of the circuit control board and the bracket with the fastener, which is beneficial for fixing the circuit control board without the need for a protective box while protecting the circuit control board. This can reduce or even eliminate the influence of the torque of the fastener and the bracket on the protective box, reduce the risk of the protective box being damaged by force, and also help to make the connection between the fastener and the bracket more secure, thereby improving the fixing effect of the position of the circuit control board relative to the protective box.

[0013] In some embodiments, the avoidance hole includes a first sub-hole, a portion of the fastener is located in the first sub-hole and abuts against the circuit control board, so that the screw-in depth of the bracket and the fastener reaches a maximum value, and in the projection plane perpendicular to the first direction, the projection of the fastener is completely located within the projection range of the first sub-hole. In this way, the first sub-hole can make the protective box completely avoid the movement of the fastener along the first direction, so that at least a portion of the protective box will not be squeezed between the circuit control board and the fastener along the first direction, reducing the risk of the protective box being squeezed and damaged, which is conducive to extending the service life of the protective box.

[0014] In some embodiments, the avoidance hole includes a second sub-hole, the protective box includes a first wall, the second sub-hole is provided on the first wall, a portion of the fastener extends into the mounting hole through the second sub-hole, and the fastener is provided with a first stop surface, and the first stop surface is located on the side of the first wall away from the circuit control board. In this way, in the first direction, the protective box can be limited by the fastener and the circuit control board through the first wall; at the same time, the protective box can be limited in a direction perpendicular to the first direction through the limiting effect between the inner wall of the second sub-hole and the fastener.

[0015] In some embodiments, the distance between the first stop surface and the surface of the circuit control board on the side close to the first wall along the first direction is a first distance, the dimension of the first wall along the first direction is a second distance, and the first distance is not less than the second distance. In this way, while achieving the purpose of limiting the protection box along the first direction through the first wall, it is beneficial to reduce the probability of deformation and damage of the first wall due to the acting force along the first direction from the first stop surface and the circuit control board, and is beneficial to extending the service life of the protection box.

[0016] In some embodiments, the battery management unit further includes an elastic member, and the elastic member is clamped between the first stop surface and the first wall and elastically deforms along the first direction. In this way, on the one hand, it is beneficial that along the first direction, the elastic member and the circuit control board can jointly fix the position of the first wall; on the other hand, through the elastic deformation of the elastic member, it can effectively reduce the acting force transmitted to the first wall due to external vibration, collision, etc. during the use of the battery device, reduce the risk of deformation and damage of the protection box, and is beneficial to extending the service life of the protection box.

[0017] In some embodiments, the fastener is provided with a second stop surface, and the surface of the circuit control board on the side close to the first wall along the first direction can be in contact with the second stop surface along the first direction, so that the screw-in depth of the bracket and the fastener reaches the maximum value. In this way, after the second stop surface is in contact with the circuit control board along the first direction, the first stop surface cannot approach the circuit control board further along the first direction, thereby reducing the probability of the first stop surface squeezing the first wall; the contact area between the second stop surface and the circuit control board is outside the installation hole, which is beneficial to observing whether the second stop surface and the circuit control board are in contact.

[0018] In some embodiments, the fastener includes a screw rod and a nut, the screw rod is arranged on one side of the nut along the first direction and passes through the installation hole, the screw rod is in threaded cooperation with the bracket, a part of the nut protrudes from the screw rod perpendicular to the first direction, the nut is provided with the first stop surface and the second stop surface, and along the first direction, the first stop surface is farther from the screw rod than the second stop surface. In this way, the screw rod can be inserted into the installation hole to be in threaded cooperation with the bracket, and the nut is located on one side of the installation hole along the first direction, so as to synchronously limit the first wall and limit the insertion depth between the bracket and the screw rod through the nut.

[0019] In some embodiments, the fastener is provided with a third stop surface, and the third stop surface can be located in the mounting hole and abut against the bracket along the first direction, so that the screwing depth of the bracket and the fastener reaches a maximum value. In this way, it is beneficial to prevent the fastener from abutting against the circuit control board along the first direction, to reduce the force applied by the fastener to the circuit control board along the first direction, and to reduce the risk of deformation and damage to the circuit control board; the abutment position between the third stop surface and the bracket is located in the mounting hole, which is beneficial to use the inner wall of the mounting hole to cover the abutment position, and reduce the risk of foreign matter causing the abutment position between the third stop surface and the bracket to be damaged or corroded, thereby loosening the connection between the fastener and the bracket.

[0020] In some embodiments, the fastener includes a screw, a nut, and a transfer rod, the screw is located on a side of the transfer rod away from the nut along the first direction, the screw is threadedly engaged with the bracket, the transfer rod connects the nut and the screw, at least a portion of the transfer rod is located in the mounting hole, a portion of the transfer rod protrudes from the screw perpendicularly to the first direction, and at least a portion of the end surface of the protruding portion close to one side of the screw forms the third stop surface, and a portion of the nut protrudes from the transfer rod perpendicularly to the first direction, and at least a portion of the end surface of the protruding portion close to one side of the screw forms the first stop surface. In this way, the nut is located outside the mounting hole to limit the first wall and the circuit control board along the first direction; the transfer rod can be inserted into the mounting hole through the second sub-hole to abut against the bracket along the first direction.

[0021] In some embodiments, the avoidance hole includes a third sub-hole, the bracket is provided with a threaded column extending along the first direction, the threaded column can be threadedly matched with the fastener, the threaded column passes through the third sub-hole and a portion thereof abuts against the circuit control board, and in a projection plane perpendicular to the first direction, the projection of the threaded column is completely within the projection range of the third sub-hole. In this way, the protective box can completely avoid the movement of the threaded column along the first direction through the third sub-hole, so that at least a portion of the protective box will not be squeezed between the circuit control board and the threaded column along the first direction, reducing the risk of the protective box being squeezed and damaged, which is conducive to extending the service life of the protective box.

[0022] In some embodiments, the threaded column is provided with a threaded hole extending along a first direction, the threaded hole is open along a first side of the first direction and the end surface of the first side of the threaded column forms a fourth stop surface, the fastener is provided with a third stop surface, the circuit control board and the third stop surface are both in contact with the fourth stop surface, so that the screwing depth of the bracket and the fastener reaches a maximum value. This is conducive to simplifying the structure of the threaded column and simplifying the manufacturing process of the threaded column.

[0023] In some embodiments, the protective box is a plastic suction molding. In this way, it is beneficial to make the protective box have insulation properties and reduce the risk of short circuit of the circuit control board. At the same time, the wall thickness of the plastic suction molding is relatively thin, which is beneficial to the light weight of the protective box.

[0024] In some embodiments, the protective box includes two box covers. The two box covers are connected to each other and can rotate relative to each other with the connection position as the rotation axis, so that the two box covers are enclosed along the first direction to form the installation cavity. In this way, it is convenient for manufacturing when the box covers are not closed. The installation cavity is formed by enclosing in a covering manner, and its operation is simple, which is beneficial to improving the assembly efficiency of the battery management unit.

[0025] In some embodiments, one of the two box covers is provided with an installation groove, and the other is provided with a fixing protrusion. One side of the installation groove is open. In the state where the two box covers are closed to each other, the fixing protrusion is inserted into the installation groove along the first direction through the open position of the installation groove and is pressed and fitted with the inner wall of the installation groove in a direction perpendicular to the first direction. In this way, it is beneficial to reduce the probability that the two box covers are separated under the influence of factors such as the self-gravity of the box cover and external vibration, and thus cannot protect the circuit control board.

[0026] In some embodiments, the box cover is provided with a through hole. The battery management unit further includes a tree-shaped rivet. The tree-shaped rivet includes a limiting portion, an installation rod, and a barb portion. The installation rod is provided on one side of the limiting portion, and the barb portion is provided on a side of the installation rod perpendicular to the direction opposite to the relative direction between the installation rod and the limiting portion. Along the direction away from the installation rod, the barb portion extends obliquely towards the limiting portion. In the state where the two box covers are closed to each other, the installation rod passes through the two through holes communicated with each other of the two box covers, the limiting portion is located on the first side of the two box covers along the first direction and abuts against the box cover on the first side, and at least one barb portion is located on the second side of the two box covers along the first direction, and the end of the barb portion close to the limiting portion abuts against the box cover on the second side. In this way, through the limiting portion and the barb portion extending out of the through hole of the box cover on the second side, the two box covers can be limited along the first direction, which is beneficial to reducing the probability that the two box covers are separated under the influence of factors such as the self-gravity of the box cover and external vibration, and thus cannot protect the circuit control board.

[0027] The embodiment of the present application further provides an energy storage device, and the energy storage device includes the battery device in any one of the foregoing embodiments.

[0028] In this way, it is beneficial to reduce the risk that the circuit control board is displaced relative to the protective box and is not protected during the operation of the energy storage device, and is beneficial to improving the service life.

[0029] An embodiment of the present application further provides an electrical device, which includes the battery device of any one of the aforementioned embodiments or the energy storage device of the aforementioned embodiments, and the battery device is used as a power source for the electrical device.

[0030] This helps reduce the risk of the circuit control board being displaced relative to the protective box and not being protected during the operation of the electrical device, and helps to increase the service life.

[0031] The present application also provides a battery management unit for electrically connecting to an electrical element in a battery device, the battery management unit comprising:

[0032] The circuit control board is provided with a mounting hole penetrating along a first direction;

[0033] A protective box is provided with a mounting cavity and an avoidance hole, at least part of the circuit control board is located in the mounting cavity, the avoidance hole communicates the mounting cavity with the outside of the protective box, and the mounting hole communicates with the outside of the protective box through the avoidance hole;

[0034] Bracket;

[0035] A fastener is threadedly matched with the bracket, at least one of the bracket and the fastener is inserted into the mounting hole through the avoidance hole, a portion of the circuit control board is located between the fastener and the bracket along the first direction, and at least one of the circuit control board and the bracket can abut against the fastener along the first direction so that the threaded screwing depth of the bracket and the fastener reaches a maximum value.

[0036] In this way, at least one of the circuit control board and the bracket is directly in contact with the fastener to achieve the maximum screw-in depth of the bracket and the fastener, which is beneficial for the circuit control board to be protected by the protective box while fixing the circuit control board without the protective box. This can reduce or even eliminate the influence of the torque of the fastener and the bracket on the protective box, reduce the risk of damage to the protective box due to force, and make the connection between the fastener and the bracket more secure, thereby improving the fixing effect of the position of the circuit control board relative to the protective box.

[0037] In some embodiments, the avoidance hole includes a second sub-hole, the protective box includes a first wall, the second sub-hole is provided on the first wall, a portion of the fastener extends into the mounting hole through the second sub-hole, and the fastener is provided with a first stop surface, and the first stop surface is located on the side of the first wall away from the circuit control board. In this way, in the first direction, the protective box can be limited by the fastener and the circuit control board through the first wall; at the same time, the protective box can be limited in a direction perpendicular to the first direction through the limiting effect between the inner wall of the second sub-hole and the fastener.

[0038] In some embodiments, the fastener is provided with a second stop surface, and the surface of the circuit control board on the side close to the first wall along the first direction abuts against the second stop surface along the first direction, so that the screwing-in depth of the bracket and the fastener reaches the maximum value. In this way, after the second stop surface abuts against the circuit control board along the first direction, the first stop surface cannot approach the circuit control board further along the first direction, thereby reducing the probability of the first stop surface squeezing the first wall; the abutting area between the second stop surface and the circuit control board is located outside the mounting hole, which is beneficial to observing whether the second stop surface and the circuit control board are in an abutting state.

[0039] In some embodiments, the fastener is provided with a third stop surface, and the third stop surface is located in the mounting hole and abuts against the bracket along the first direction to limit the insertion depth between the bracket and the fastener. In this way, it is beneficial to prevent the fastener from abutting against the circuit control board along the first direction, which is beneficial to reducing the force exerted by the fastener on the circuit control board along the first direction, and is beneficial to reducing the risk of the circuit control board being deformed or damaged due to force; the abutting position between the third stop surface and the bracket is located in the mounting hole, which is beneficial to using the inner wall of the mounting hole to shield the abutting position, and reducing the risk of the abutting position between the third stop surface and the bracket being damaged or corroded by foreign objects, resulting in the loosening of the connection between the fastener and the bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of an electrical device being a vehicle in an embodiment of the present application;

[0041] Figure 2 Explosion schematic diagram of a battery device in an embodiment of the present application;

[0042] Figure 3 Schematic diagram of a battery management unit in an embodiment of the present application, wherein the protective box is in a closed state;

[0043] Figure 4 is Figure 3 Partial enlarged schematic diagram of position A in;

[0044] Figure 5 is Figure 3 Schematic diagram of the battery management unit in another perspective in;

[0045] Figure 6 is Figure 5 Partial sectional schematic diagram at position B-B in;

[0046] Figure 7 Partial sectional schematic diagram of a battery management unit in another embodiment of the present application, and the section position is the same as that at position C-C in Figure 5 ;

[0047] Figure 8 This is a partial sectional view of the battery management unit in another embodiment of the present application, and the section position is the same as that of Figure 5 the position D-D in

[0048] Figure 9 This is a schematic view of the lid of the battery management unit in an open state in an embodiment of the present application;

[0049] Figure 10 is Figure 5 a partial sectional view of the position E-E in

[0050] Figure 11 is Figure 5 a partial sectional view of the position F-F in

[0051] Explanation of reference numerals

[0052] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, housing assembly; 11, first housing assembly; 12, second housing assembly; 20, battery cell; 30, battery management unit; 31, protective box; 31a, installation cavity; 31b, avoidance hole; 31ba, first sub-hole; 31bb, second sub-hole; 31bc, third sub-hole; 311, lid; 311a, installation groove; 311b, through hole; 3111, fixing protrusion; 312, first wall; 32, circuit control board; 32a, installation hole; 32b, fixing hole; 321, board body; 322, connector; 33, bracket; 33a, threaded hole; 331, threaded post; 331a, fourth stop surface; 34, fastener; 34a, first stop surface; 34b, second stop surface; 34c, third stop surface; 341, screw; 342, nut; 343, adapter bar; 40, elastic member; 50, tree-shaped rivet; 51, limiting portion; 52, installation rod; 53, barb portion. Detailed implementation manners

[0053] It should be noted that, without conflict, the embodiments in the present invention and the technical features in the embodiments can be combined with each other. The detailed description in the specific implementation manners should be understood as an explanatory description of the gist of the present invention and should not be regarded as an improper limitation to the present invention.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and the above drawings of the present invention are intended to cover non-exclusive inclusion.

[0055] In the description of the embodiments of the present utility model, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present utility model, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0056] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0057] In the description of the embodiments of the present utility model, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0058] In the description of the embodiments of the present application, for the convenience of explanation, as shown in the accompanying drawings of the specification, the direction of the arrow F1 is referred to as the “first direction”, and the direction of the arrow F2 is referred to as the “second direction”.

[0059] In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0060] In the description of the embodiments of the present utility model, unless otherwise clearly stipulated and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact or contact through an intermediate medium layer. It can be contact with essentially no interaction force between the two contacting parties, or it can be contact with interaction force between the two contacting parties.

[0061] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0062] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0063] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, and the separator is disposed between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and at the same time allow the active ions to pass through.

[0064] In some embodiments, a pressure relief mechanism is provided on the outer shell of the battery cell. The pressure relief mechanism is used to discharge the internal gas of the battery cell.

[0065] As an example, it is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is damaged, thereby forming an opening or a channel for discharging the internal pressure or temperature. This threshold design varies according to different design requirements. The threshold may depend on one or several materials of the positive electrode sheet, the negative electrode sheet, the electrolyte, and the separator in the battery cell.

[0066] As an example, the pressure relief mechanism can be integrally formed with the outer shell.

[0067] As an example, the pressure relief mechanism can also be separately provided and connected to the outer shell.

[0068] The "actuation" mentioned in the present application means that the pressure relief mechanism generates an action or is activated to a certain state, so that the internal pressure and temperature of the battery cell can be released. The actions generated by the pressure relief mechanism can include but are not limited to: the components in the pressure relief mechanism move to form an exhaust channel, at least a part of the pressure relief mechanism breaks, is crushed, is torn, or is opened, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell are discharged outwards from the actuated part as emissions. In this way, the battery cell can be pressure-relieved and temperature-relieved under a controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0069] In some embodiments, when the outer shell is a non-sealed structure, the pressure relief mechanism can be set as a through hole for discharging the internal gas of the battery cell.

[0070] The emissions from the battery cell mentioned in the present application include but are not limited to: electrolytes, dissolved or split positive and negative electrode sheets, fragments of the separator, high-temperature and high-pressure gases generated by reactions, flames, etc.

[0071] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0072] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0073] As an example, the battery cell assembly may be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells with cable ties.

[0074] In some embodiments, referring to Figure 2 , the battery device may be a battery pack, and the battery pack includes a box body assembly and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body assembly.

[0075] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body assembly by fixing the battery module in the box body assembly.

[0076] As an example, the battery cell assembly may also be accommodated in the box body assembly by directly fixing a plurality of battery cells to the box body assembly.

[0077] As an example, referring to Figure 2 , the box body assembly 10 may include a first box body assembly 11 and a second box body assembly 12. The first box body assembly 11 and the second box body assembly 12 are snapped together so that a closed space is formed inside the box body assembly 10 to accommodate the battery cell assembly. Here, "closed" means covering or closing, which may be sealed or non-sealed. The first box body assembly 11 may be a top cover or a bottom plate.

[0078] As an example, the box body assembly may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body assembly to accommodate the battery cell assembly.

[0079] In some embodiments, the box body assembly 10 may be part of the chassis structure of a vehicle. For example, a part of the box body assembly 10 may become at least a part of the floor of the vehicle, or a part of the box body assembly 10 may become at least a part of the cross beam and longitudinal beam of the vehicle.

[0080] The embodiments of the present application provide an energy storage device, which includes one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include a plurality of battery devices, and the plurality of battery devices are connected in series through a busbar component to increase the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0081] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems, etc. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low electricity consumption periods and provide electrical energy to relevant users or electrical equipment during high electricity consumption periods. The energy storage system provided by the embodiments of the present application can be any power system that requires an energy storage device.

[0082] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0083] In some embodiments, the energy storage device may include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0084] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a general control module, a power distribution module, and a fire protection module.

[0085] As an example, the thermal management module may include a liquid cooling unit, and the liquid cooling unit provides coolant for adjusting the temperature of battery cells to each battery device through pipelines.

[0086] As an example, the main control module can serve as the battery management unit of the battery cluster for monitoring and managing the battery cluster. The main control module can monitor information such as the current, voltage, power or temperature of the battery cluster. For example, it can control the charge and discharge current, voltage, etc. of the battery cluster. The main control module includes an auxiliary battery management unit SBMU (Slave Battery Management Unit, SBMU), a fusion switch and other modules.

[0087] As an example, the master control module can serve as the battery management unit of the energy storage device, and is used to monitor and manage the energy storage device. The master control module can monitor information such as the current, voltage, power, state of charge or temperature of the energy storage device. For example, it can control the charge and discharge current, voltage, etc. of the energy storage device. As an example, the master control module includes an insulation monitoring module IMM (Insulation Monitoring Module, abbreviated as IMM), a master battery management unit MBMU (Master Battery Management Unit, MBMU), an Ethernet ETH (EtherNet, ETH), and a fiber optic conversion module and other modules.

[0088] As an example, the fire protection system includes a control panel, detectors, alarm devices, etc., and is used to detect, alarm or extinguish fires for the energy storage system.

[0089] As an example, the battery management unit can be used to distribute power to the power consumption modules of the energy storage device.

[0090] The technical solutions described in the embodiments of the present application are applicable to various power consumption devices using battery cells. For example, mobile phones, portable devices, laptop computers, battery cars, electric toys, power tools, vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spaceships, etc.

[0091] In the following embodiments, for the convenience of description, a power consumption device in an embodiment of the present application is taken as an example of a vehicle 1000 for illustration. The following will be described with reference to the accompanying drawings.

[0092] The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. As Figure 1 shown, a battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can serve as the operating power source of the vehicle 1000. The vehicle 1000 can 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, it is used for the working power requirements during the start, navigation and driving of the vehicle 1000.

[0093] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0094] Next, the embodiments of the present invention will be described in detail.

[0095] In the related art, a battery management unit is provided in a battery device. The battery management unit is used to be electrically connected to battery electrical components to control the charging and discharging processes of the battery device.

[0096] The battery management unit includes a protective box, a circuit control board, and a fastener. The circuit control board is disposed inside the protective box to protect the circuit control board through the protective box, and the protective box is fixed at a preset position in the battery device by means of a threaded fit with the fastener to synchronously fix the circuit control board.

[0097] In the related art, during the process of using the threaded fit of the fastener to fix the position of the protective box, since the fastener contacts the protective box during the tightening process, the fastener will rub against the protective box and apply a torsional force to the protective box. The protective box is made of plastic material to reduce the risk of short circuit of the circuit control board. Due to the small wall thickness of the protective box itself and the low structural strength of the plastic material, the part of the protective box in contact with the fastener will deform under the action of the fastener, resulting in a risk of detorsion of the connection between the fastener and the protective box during the use of the battery device, and further leading to problems such as displacement of the protective box and inability to fix the circuit control board.

[0098] Based on the above technical problems, an embodiment of the present application aims to provide a battery device. The fastener of the battery management unit in the battery device and the bracket are threadedly fitted and fixed through an avoidance hole passing through the protective box and a mounting hole of the circuit control board to achieve the purpose of restricting the positions of the protective box and the circuit control board. At the same time, the threaded insertion depth between the fastener and the bracket is limited by the abutment of at least one of the circuit control board and the bracket against the fastener, which is beneficial to reducing the probability of the protective box being subjected to the torsional force of the fastener, protecting the protective box and at the same time being beneficial to keeping the threaded connection between the fastener and the bracket firm.

[0099] Specifically, referring to Figures 3 to 8 , an embodiment of the present application provides a battery device 100, and the battery device 100 includes a battery management unit 30.

[0100] The battery management unit 30 includes a circuit control board 32, a protective box 31, a bracket 33, and a fastener 34.

[0101] The circuit control board 32 is provided with a mounting hole 32a penetrating along a first direction.

[0102] The protective box 31 is provided with a mounting cavity 31a and an avoidance hole 31b. At least a part of the circuit control board 32 is located inside the mounting cavity 31a. The avoidance hole 31b communicates the mounting cavity 31a with the outside of the protective box 31, and the mounting hole 32a communicates with the outside of the protective box 31 through the avoidance hole 31b.

[0103] The fastener 34 is in threaded engagement with the bracket 33.

[0104] At least one of the bracket 33 and the fastener 34 is passed through the mounting hole 32a via the avoidance hole 31b. A part of the circuit control board 32 is located between the fastener 34 and the bracket 33 in the first direction. At least one of the circuit control board 32 and the bracket 33 can abut against the fastener 34 in the first direction, so that the threaded engagement depth between the bracket 33 and the fastener 34 reaches the maximum value.

[0105] The circuit control board 32 (PCB, Printed Circuit Board) is provided with electronic components, and the electronic components are electrically connected to the electrical components in the battery device 100 to control the operation of the battery device 100.

[0106] The specific type of the electrical components electrically connected to the circuit control board 32 is not limited. For example, battery cells 20, voltage sensors, high-voltage relays, etc.

[0107] The installation cavity 31a provides an installation position for the circuit control board 32 and plays a certain protective role for the circuit control board 32.

[0108] Both the fastener 34 and the bracket 33 are provided with threads. It can be that one of them is provided with a screw rod 341, the outer side of the screw rod 341 is provided with threads, and the other is provided with a threaded hole 33a, and the inner wall of the threaded hole 33a is provided with threads. The screw rod 341 can be inserted from one side opening of the threaded hole 33a and the threads of the two can be engaged with each other by relative rotation.

[0109] Through the avoidance hole 31b, during the assembly of the battery management unit 30, at least one of the bracket 33 and the fastener 34 can be inserted into the mounting hole 32a from the outside of the protective box 31.

[0110] At least one of the bracket 33 and the fastener 34 is passed through the mounting hole 32a to restrict the position of the circuit control board 32 in a direction perpendicular to the first direction by the inner wall of the mounting hole 32a.

[0111] A part of the circuit control board 32 is located between the fastener 34 and the bracket 33 in the first direction to restrict the position of the circuit control board 32 in the first direction by the bracket 33 and the fastener 34.

[0112] During the assembly of the battery management unit 30, the bracket 33 and the fastener 34 rotate relative to each other, so that the threaded engagement depth between the two continuously increases until at least one of the circuit control board 32 and the bracket 33 abuts against the fastener 34 in the first direction, and the threaded engagement depth between the bracket 33 and the fastener 34 cannot continue to increase.

[0113] The thread engagement depth refers to the distance between the insertion end of the thread of the screw rod 341 in the bracket 33 and the fastener 34 and the entrance of the threaded hole 33a along the insertion direction after the insertion end of the thread of the screw rod 341 is inserted into the threaded hole 33a. That is, referring to Figures 6 to 8 , the thread engagement depth is S1.

[0114] When the thread engagement depth reaches the maximum value, it means that the bracket 33 and the fastener 34 cannot be further thread-engaged.

[0115] In the battery device 100 according to the embodiment of the present application, the thread engagement depth between the bracket 33 and the fastener 34 reaches the maximum value by directly abutting at least one of the circuit control board 32 and the bracket 33 against the fastener 34. Therefore, while the protective box 31 protects the circuit control board 32, the circuit control board 32 can be fixed without passing through the protective box 31. This can reduce or even eliminate the influence of the torque of the fastener 34 and the bracket 33 on the protective box 31, reduce the risk of the protective box 31 being damaged by force, and also help to make the connection between the fastener 34 and the bracket 33 more firm, improving the fixing effect of the position of the circuit control board 32 relative to the protective box 31.

[0116] It can be understood that the material of the protective box 31 is an insulating material to reduce the risk of short-circuit connection between the circuit control board 32 and other electrical components in the battery device 100.

[0117] The specific material used for the protective box 31 can be at least one of plastic, rubber, and silicone.

[0118] The specific number of the avoidance holes 31b is not limited, and it can be one or more.

[0119] The specific number of the mounting holes 32a is not limited, and it can be one or more.

[0120] The specific number of the fasteners 34 is not limited, and it can be one or more.

[0121] It can be understood that the rotation axis for the relative rotation between the fastener 34 and the bracket 33 is along the first direction.

[0122] In some embodiments, referring to Figures 6 to 8 , the fastener 34 includes a screw rod 341 and a nut 342. The screw rod 341 is disposed on one side of the nut 342 along the first direction and passes through the mounting hole 32a. The screw rod 341 is in threaded cooperation with the bracket 33, and a part of the nut 342 protrudes from the screw rod 341 perpendicular to the first direction.

[0123] In some embodiments, referring to Figure 4 and Figure 6, the avoidance hole 31b includes a first sub-hole 31ba, a part of the fastener 34 is located in the first sub-hole 31ba and abuts against the circuit control board 32, so that the screwing depth of the bracket 33 and the fastener 34 reaches the maximum value. In the projection plane perpendicular to the first direction, the projection of the fastener 34 is completely within the projection range of the first sub-hole 31ba.

[0124] During the assembly of the battery management unit 30, a part of the fastener 34 can directly pass through the first sub-hole 31ba and achieve a threaded fit between the mounting hole 32a and the bracket 33. As the screwing depth of the bracket 33 and the fastener 34 increases, the fastener 34 gradually approaches the circuit control board 32 along the first direction until the fastener 34 abuts against the circuit control board 32 along the first direction, and the screwing depth between the bracket 33 and the fastener 34 no longer increases.

[0125] In the projection plane perpendicular to the first direction, the projection of the fastener 34 is completely within the projection range of the first sub-hole 31ba, so that the fastener 34 can avoid contacting the protective box 31 during the movement along the first direction. In a state where at least one of the circuit control board 32 and the bracket 33 abuts against the fastener 34 along the first direction, the fastener 34 does not contact the protective box 31 along the first direction.

[0126] It can be understood that in the projection plane perpendicular to the first direction, at least part of the projection of the mounting hole 32a is within the projection range of the first sub-hole 31ba, so that the fastener 34 can pass through the first sub-hole 31ba and extend into the mounting hole 32a.

[0127] In this way, through the first sub-hole 31ba, the protective box 31 can completely avoid the movement of the fastener 34 along the first direction, so that at least part of the protective box 31 will not be squeezed between the circuit control board 32 and the fastener 34 along the first direction, reducing the risk of damage to the protective box 31 due to extrusion and being beneficial to extending the service life of the protective box 31.

[0128] It can be understood that the fastener 34 and the bracket 33 play a role in limiting the circuit control board 32, and then through the circuit control board 32, the protective box 31 can be limited by the inner wall of the installation cavity 31a.

[0129] It should be noted that limiting means restricting the object to a specific position or area. Among them, restricting to a specific position means directly fixing the object so that the object cannot move; restricting to a specific area means that the object can move within a specific area and its activity range does not exceed the specific area.

[0130] In some embodiments provided with the nut 342, refer to Figure 6At least a portion of the nut 342 is located in the first sub-hole 31 ba and abuts against the circuit control board 32 .

[0131] In some embodiments, see Figure 7 and Figure 8 The avoidance hole 31b includes a second sub-hole 31bb, the protective box 31 includes a first wall 312, the second sub-hole 31bb is arranged on the first wall 312, a part of the fastener 34 extends into the mounting hole 32a through the second sub-hole 31bb, the fastener 34 is provided with a first stop surface 34a, and the first stop surface 34a is located on the side of the first wall 312 away from the circuit control board 32.

[0132] At least a portion of the first wall 312 is located between the circuit control board 32 and the fastener 34 along the first direction. That is, in a projection plane perpendicular to the first direction, a portion of the first wall 312 is projected within the projection range of the circuit control board 32, and a portion of the first wall 312 is projected within the projection range of the fastener 34.

[0133] In this way, in the first direction, the protective box 31 can be limited by the fastener 34 and the circuit control board 32 through the first wall 312; at the same time, through the limiting effect between the inner wall of the second sub-hole 31bb and the fastener 34, the protective box 31 can be limited in a direction perpendicular to the first direction.

[0134] In some embodiments, see Figure 7 The distance between the first stop surface 34a and the surface of the circuit control board 32 along the first direction close to the first wall 312 is the first distance, the dimension of the first wall 312 along the first direction is the second distance, and the first distance is not less than the second distance. That is, the first distance is L1, the second distance is L2, and L1≥L2.

[0135] That is, the first stopping surface 34 a and the circuit control board 32 do not press the first wall 312 along the first direction.

[0136] In this way, while achieving the purpose of limiting the protective box 31 along the first direction by the first wall 312, it is beneficial to reduce the probability of the first wall 312 being deformed or damaged due to the force of the first stop surface 34a and the circuit control board 32 along the first direction, which is beneficial to extending the service life of the protective box 31.

[0137] It can be understood that when the first spacing is equal to the second spacing, the first wall 312 is fixed along the first direction; when the first spacing is greater than the second spacing, the first wall 312 can move along the first direction between the circuit control board 32 and the first stop surface 34a.

[0138] In some embodiments, see Figure 7 and Figure 8, the battery management unit 30 further includes an elastic member 40, and the elastic member 40 is clamped between the first stop surface 34a and the first wall 312 and elastically deforms along the first direction.

[0139] In this way, on the one hand, it is beneficial for the elastic member 40 and the circuit control board 32 to jointly fix the position of the first wall 312 along the first direction; on the other hand, through the elastic deformation of the elastic member 40, the force transmitted to the first wall 312 during the use of the battery device 100 due to external vibrations, collisions, etc. can be effectively reduced, reducing the risk of deformation and damage of the protective box 31 and being beneficial to extending the service life of the protective box 31.

[0140] The specific type of the elastic member 40 is not limited, such as foam, rubber ring, silica gel pad, etc.

[0141] It can be understood that in the projection plane perpendicular to the first direction, at least part of the projection of the mounting hole 32a is located within the projection range of the second sub-hole 31bb, so that the fastener 34 can pass through the second sub-hole 31bb and extend into the mounting hole 32a.

[0142] In some embodiments, refer to Figure 7 , the fastener 34 is provided with a second stop surface 34b, and the surface of the circuit control board 32 on the side close to the first wall 312 along the first direction can be in contact with the second stop surface 34b along the first direction, so that the screw-in depth of the bracket 33 and the fastener 34 reaches the maximum value.

[0143] It can be understood that in the projection plane perpendicular to the first direction, the projection of the second stop surface 34b is completely located within the projection range of the second sub-hole 31bb and at least part of it is outside the projection range of the mounting hole 32a.

[0144] During the process of screwing the threads between the bracket 33 and the fastener 34 together, the second stop surface 34b moves along the first direction towards the circuit control board 32 until the second stop surface 34b contacts the circuit control board 32.

[0145] In the state where the second stop surface 34b contacts the circuit control board 32 along the first direction, a gap is formed between the first stop surface 34a and the circuit control board 32 along the first direction, and at least part of the first wall 312 is located in the gap.

[0146] In this way, after the second stop surface 34b contacts the circuit control board 32 along the first direction, the first stop surface 34a cannot further approach the circuit control board 32 along the first direction, thereby reducing the probability of the first stop surface 34a squeezing the first wall 312; the contact area between the second stop surface 34b and the circuit control board 32 is outside the mounting hole 32a, which is beneficial to observing whether the second stop surface 34b and the circuit control board 32 are in a contact state.

[0147] It is understandable that the distance between the first stop surface 34a and the second stop surface 34b in the first direction is not less than the dimension of the first wall 312 in the first direction.

[0148] The specific structure for forming the first stop surface 34a and the second stop surface 34b is not limited.

[0149] Exemplarily, in some embodiments where the fastener 34 includes a screw 341 and a nut 342, referring to Figure 7 , the nut 342 is provided with a first stop surface 34a and a second stop surface 34b. In the first direction, the first stop surface 34a is farther from the screw 341 than the second stop surface 34b.

[0150] In this way, the screw 341 can be inserted into the mounting hole 32a to be threadedly engaged with the bracket 33, and the nut 342 is located on one side of the mounting hole 32a in the first direction, so as to synchronously limit the first wall 312 and limit the insertion depth between the bracket 33 and the screw 341 through the nut 342.

[0151] In some embodiments, the fastener 34 is a stepped bolt, and the nut 342 includes at least two levels of steps in the first direction. The end face of one level of step facing the screw 341 forms the second stop surface 34b, and the end face of another level of step farther from the screw 341 than this step facing the screw 341 forms the first stop surface 34a.

[0152] In some embodiments, referring to Figure 8 , the fastener 34 is provided with a third stop surface 34c. The third stop surface 34c can be located in the mounting hole 32a and abuts against the bracket 33 in the first direction, so that the screw-in depth of the thread between the bracket 33 and the fastener 34 reaches the maximum value.

[0153] The third stop surface 34c enters the mounting hole 32a through the second sub-hole 31bb, and approaches the bracket 33 in the first direction as the thread between the fastener 34 and the bracket 33 is screwed, until the third stop surface 34c abuts against the bracket 33.

[0154] In this way, it is beneficial to prevent the fastener 34 from abutting against the circuit control board 32 in the first direction, beneficial to reducing the force exerted by the fastener 34 on the circuit control board 32 in the first direction, and beneficial to reducing the risk of the circuit control board 32 being deformed or damaged by force; the abutting position between the third stop surface 34c and the bracket 33 is located in the mounting hole 32a, which is beneficial to using the inner wall of the mounting hole 32a to shield the abutting position, and reducing the risk of the abutting position between the third stop surface 34c and the bracket 33 being damaged or corroded by foreign objects, resulting in the loosening of the connection between the fastener 34 and the bracket 33.

[0155] The specific structural form for forming the third stop surface 34c is not limited.

[0156] Exemplarily, referring to Figure 8 , the fastener 34 includes a screw 341, a nut 342, and an adapter rod 343. The screw 341 is located on one side of the adapter rod 343 away from the nut 342 along the first direction. The screw 341 is in threaded cooperation with the bracket 33. The adapter rod 343 connects the nut 342 and the screw 341. At least a part of the adapter rod 343 is located in the mounting hole 32a. A part of the adapter rod 343 protrudes perpendicular to the first direction from the screw 341, and at least a part of the end surface on the side close to the screw 341 of the protruding part forms the third stop surface 34c. A part of the nut 342 protrudes perpendicular to the first direction from the adapter rod 343, and at least a part of the end surface on the side close to the screw 341 of the protruding part forms the first stop surface 34a.

[0157] The nut 342 is located outside the mounting hole 32a to limit the first wall 312 and the circuit control board 32 in the first direction; the adapter rod 343 can be inserted into the mounting hole 32a through the second sub-hole 31bb to abut against the bracket 33 in the first direction.

[0158] In some embodiments, in the projection plane perpendicular to the first direction, the projection of the screw 341 is completely within the projection range of the adapter rod 343, so that the projection of the third stop surface 34c surrounds the circumference of the projection of the adapter rod 343, which is beneficial to making the force distribution between the adapter rod 343 and the bracket 33 more uniform.

[0159] In some embodiments, referring to Figure 8 , in the projection plane perpendicular to the first direction, the projection of the adapter rod 343 is completely within the projection range of the nut 342.

[0160] In some embodiments, referring to Figure 8 , in the projection plane perpendicular to the first direction, the projection of the mounting hole 32a is completely within the projection range of the nut 342, so that the nut 342 blocks the mounting hole 32a and reduces the probability of foreign objects entering the mounting hole 32a.

[0161] In some embodiments, referring to Figure 7 and Figure 8 , in the projection plane perpendicular to the first direction, the projection of the second sub-hole 31bb is completely within the projection range of the nut 342, so that the nut 342 blocks the mounting hole 32a and reduces the probability of foreign objects entering the second sub-hole 31bb.

[0162] In some embodiments, referring to Figure 4 、 Figures 6 to 8, the avoidance hole 31b includes a third sub-hole 31bc. The bracket 33 is provided with a threaded post 331 extending along the first direction. The threaded post 331 can be in threaded cooperation with the fastener 34. The threaded post 331 passes through the third sub-hole 31bc and a part of it abuts against the circuit control board 32. In the projection plane perpendicular to the first direction, the projection of the threaded post 331 is completely within the projection range of the third sub-hole 31bc.

[0163] During the assembly of the battery management unit 30, a part of the threaded post 331 can directly pass through the third sub-hole 31bc and achieve threaded cooperation between the mounting hole 32a and the bracket 33.

[0164] In the projection plane perpendicular to the first direction, the projection of the threaded post 331 is completely within the projection range of the third sub-hole 31bc, so that the threaded post 331 can move along the first direction without contacting the protective box 31.

[0165] It can be understood that in the projection plane perpendicular to the first direction, at least part of the projection of the mounting hole 32a is within the projection range of the third sub-hole 31bc, so that the threaded post 331 can pass through the third sub-hole 31bc and extend into the mounting hole 32a.

[0166] By the threaded post 331 abutting against the circuit control board 32 along the first direction, the position of the circuit control board 32 along the first direction is also restricted.

[0167] In this way, through the third sub-hole 31bc, the protective box 31 can completely avoid the movement of the threaded post 331 along the first direction, so that at least part of the protective box 31 will not be squeezed between the circuit control board 32 and the threaded post 331 along the first direction, reducing the risk of damage to the protective box 31 due to extrusion and being beneficial to extending the service life of the protective box 31.

[0168] It can be understood that the threaded post 331 can extend into the mounting hole 32a or be located outside the mounting hole 32a.

[0169] In the embodiment provided with the first sub-hole 31ba, refer to Figure 6 , the third sub-hole 31bc is located on the side of the mounting hole 32a away from the first sub-hole 31ba.

[0170] In the embodiment provided with the second sub-hole 31bb, refer to Figure 7 and Figure 8 , the third sub-hole 31bc is located on the side of the mounting hole 32a away from the second sub-hole 31bb.

[0171] In some embodiments, threads are provided on the outer peripheral side of the threaded post 331 perpendicular to the first direction; in other embodiments, refer to Figures 6 to 8, the threaded post 331 is provided with a threaded hole 33a extending in the first direction, and at least one side of the threaded hole 33a in the first direction is open.

[0172] In some embodiments where the threaded hole 33a is provided, refer to Figure 8 , the first side of the threaded hole 33a in the first direction is open, and the end face of the first side of the threaded post 331 forms a fourth stop surface 331a. The fastener 34 is provided with a third stop surface 34c, and both the circuit control board 32 and the third stop surface 34c are in contact with the fourth stop surface 331a, so that the screwing depth of the bracket 33 and the fastener 34 reaches the maximum value.

[0173] That is to say, the fourth stop surface 331a is both used to contact the third stop surface 34c to make the screwing depth of the threaded post 331 and the fastener 34 reach the maximum value, and is also used to contact the circuit control board 32 to limit the position of the circuit control board 32 in the first direction.

[0174] In this way, it is beneficial to simplify the structure of the threaded post 331 and simplify the manufacturing process of the threaded post 331.

[0175] In some embodiments, the protective box 31 is a plastic suction molding.

[0176] That is to say, the protective box 31 is made of plastic material and is manufactured by the plastic suction molding process.

[0177] In this way, it is beneficial to make the protective box 31 have insulation properties and reduce the risk of short circuit of the circuit control board 32; at the same time, the wall thickness of the plastic suction molding is relatively thin, which is beneficial to the lightweight of the protective box 31.

[0178] In some embodiments, refer to Figure 9 , the protective box 31 includes two box covers 311. The two box covers 311 are connected to each other and can rotate relative to each other with the connection position as the rotation axis, so that the two box covers 311 are enclosed in the first direction to form an installation cavity 31a.

[0179] It can be understood that the extending direction of the rotation axis intersects with the first direction.

[0180] At least part of one box cover 311 is located on one side of the circuit control board 32 in the first direction, and at least part of the other box cover 311 is located on the other side of the circuit control board 32 in the first direction.

[0181] In this way, it is convenient for manufacturing when the box covers 311 are not closed; the installation cavity 31a is formed by enclosing through the closing method, and the operation is simple, which is beneficial to improving the assembly efficiency of the battery management unit 30.

[0182] The specific way to enable relative rotation between the two lid covers 311 is not limited. For example, the two lid covers 311 are hinged through a hinge; also, in the embodiment where the protective box 31 is a plastic suction molding, each lid cover 311 is an integral structure, and the connection strength at the connection position between the two lid covers 311 is lower than that of other areas to form a flexible structure, so as to bend the connection position between the two lid covers 311 to form the protective box 31.

[0183] In some embodiments, referring to Figure 5 、 Figure 9 and Figure 10 , one of the two lid covers 311 is provided with an installation groove 311a, and the other is provided with a fixing protrusion 3111. One side of the installation groove 311a is open. In the state where the two lid covers 311 are closed to each other, the fixing protrusion 3111 is inserted into the installation groove 311a along the first direction through the open position of the installation groove 311a and is pressed and fitted with the inner wall of the installation groove 311a in a direction perpendicular to the first direction.

[0184] Through the pressing and fitting between the inner wall of the installation groove 311a and the fixing protrusion 3111, a frictional force in the first direction is generated between the two.

[0185] In this way, it is beneficial to reduce the probability that the two lid covers 311 separate under the influence of factors such as their own gravity and external vibration, and thus cannot protect the circuit control board 32.

[0186] It can be understood that at least one of the inner wall of the installation groove 311a and the fixing protrusion 3111 can undergo elastic deformation so that the fixing protrusion 3111 can be inserted into the installation groove 311a.

[0187] In some embodiments, in a direction perpendicular to the first direction, an interference fit exists between the inner wall of the installation groove 311a and the fixing protrusion 3111, so that after the fixing protrusion 3111 is inserted into the installation groove 311a, it is pressed and fitted with the inner wall of the installation groove 311a.

[0188] In some embodiments, referring to Figure 9 and Figure 11, the lid 311 is provided with a through hole 311b. The battery management unit 30 further includes a tree-shaped rivet 50. The tree-shaped rivet 50 includes a limiting portion 51, a mounting rod 52 and a barb portion 53. The mounting rod 52 is disposed on one side of the limiting portion 51, and the barb portion 53 is disposed on the side of the mounting rod 52 perpendicular to the direction opposite to the mounting rod 52 and the limiting portion 51. Along the direction away from the mounting rod 52, the barb portion 53 extends obliquely toward the limiting portion 51. In the state where the two lids 311 are closed with each other, the mounting rod 52 passes through the two through holes 311b communicated with each other in the two lids 311. The limiting portion 51 is located on the first side of the two lids 311 along the first direction and abuts against the lid 311 on the first side. At least one barb portion 53 is located on the second side of the two lids 311 along the first direction, and the end of the barb portion 53 close to the limiting portion 51 abuts against the lid 311 on the second side.

[0189] During the installation of the tree-shaped rivet, the mounting rod 52 is inserted into the through hole 311b of the lid 311 on the first side. Due to the inclined setting of the barb portion 53, the barb portion 53 is deformed under the extrusion of the inner wall of the through hole 311b, so that a part of the mounting rod 52 and at least one barb portion 53 extend out of the through hole 311b of the lid 311 on the second side. The end of the barb portion 53 close to the limiting portion 51 abuts against the cover plate on the second side along the first direction, making it difficult for the mounting rod 52 and the barb portion 53 extending out of the through hole 311b of the lid 311 on the second side to move from the through hole 311b of the lid 311 on the second side to the through hole 311b of the lid 311 on the first side.

[0190] In this way, through the limiting portion 51 and the barb portion 53 extending out of the through hole 311b of the lid 311 on the second side, the two lids 311 can be limited along the first direction, which is beneficial to reducing the probability that the two lids 311 are separated under the influence of their own gravity and external vibrations and other factors and cannot protect the circuit control board 32.

[0191] It can be understood that the first side and the second side are only used to distinguish two different relative directions of the first direction, and do not specifically refer to a certain direction.

[0192] It can be understood that the barb portion 53 can elastically deform in a direction perpendicular to the first direction, so as to contract toward the mounting rod 52 during the process of passing through the through hole 311b and extend in a direction away from the mounting rod 52 after passing through the through hole 311b.

[0193] In some embodiments, refer to Figure 11 , the circuit control board 32 is provided with a fixing hole 32b penetrating along the first direction. The two sides of the fixing hole 32b along the first direction are respectively communicated with the through hole 311b of a lid 311. In the state where the two lids 311 are closed with each other, the mounting rod 52 passes through the fixing hole 32b.

[0194] In this way, the tree-shaped rivet can also play a role in fixing the relative positions of the protection box 31 and the circuit control board 32.

[0195] In some embodiments, the battery device 100 further includes a box body assembly 10. An installation space is provided in the box body assembly 10. Both the electrical components and the battery management unit 30 are disposed in the installation space, and the bracket 33 is fixed to the inner wall of the installation space.

[0196] In some embodiments, referring to Figure 3 and Figure 9 , the circuit control board 32 includes a board body 321 and a plurality of connectors 322. The connectors 322 are disposed on one side of the board body 321 along the first direction. The mounting holes 32a are provided on the board body 321. The connectors 322 are used for electrically connecting with the electrical components. The plurality of connectors 322 are arranged along the second direction, and the distance between two adjacent connectors 322 does not exceed 5 mm (millimetre). That is, L3 ≤ 5 mm.

[0197] In this way, it is beneficial to make the structure of the circuit control board 32 more compact.

[0198] The connector 322 can be electrically connected to the sensor disposed on the battery cell 20 through an FPC (Flexible Printed Circuit).

[0199] It can be understood that the first direction intersects with the second direction.

[0200] The battery device 100 in a specific embodiment of the present application is as follows:

[0201] The battery device 100 includes a battery management unit 30, which includes a circuit control board 32, a protective box 31, a bracket 33 and a fixing part. The circuit control board 32 is provided with a mounting hole 32a extending along a first direction. The protective box 31 is provided with a mounting cavity 31a and an avoidance hole 31b. At least a portion of the circuit control board 32 is located in the mounting cavity 31a. The avoidance hole 31b connects the mounting cavity 31a with the outside of the protective box 31. The mounting hole 32a is connected with the outside of the protective box 31 through the avoidance hole 31b. The fastener 34 is threadedly matched with the bracket 33. At least one of the bracket 33 and the fastener 34 is inserted into the mounting hole 32a through the avoidance hole 31b. A portion of the circuit control board 32 is located between the fastener 34 and the bracket 33 along the first direction. At least one of the circuit control board 32 and the bracket 33 can abut against the fastener 34 along the first direction so that the threaded screw-in depth of the bracket 33 and the fastener 34 reaches the maximum value. The avoidance hole 31b includes a second sub-hole 31bb, the protective box 31 includes a first wall 312, the second sub-hole 31bb is provided on the first wall 312, a part of the fastener 34 extends into the mounting hole 32a through the second sub-hole 31bb, and the fastener 34 is provided with a first stop surface 34a, and the first stop surface 34a is located on the side of the first wall 312 away from the circuit control board 32. The spacing between the first stop surface 34a and the surface of the circuit control board 32 along the first direction close to the first wall 312 is a first spacing, and the size of the first wall 312 along the first direction is a second spacing, and the first spacing is not less than the second spacing. The battery management unit 30 also includes an elastic member 40, which is sandwiched between the first stop surface 34a and the first wall 312 and generates elastic deformation along the first direction. The fastener 34 is provided with a second stop surface 34b, and the surface of the circuit control board 32 on one side close to the first wall 312 along the first direction can abut against the second stop surface 34b along the first direction, so that the screwing depth of the bracket 33 and the fastener 34 reaches the maximum value. The fastener 34 includes a screw rod 341 and a nut 342, the screw rod 341 is provided on one side of the nut 342 along the first direction and penetrates the mounting hole 32a, the screw rod 341 is threadedly matched with the bracket 33, a part of the nut 342 protrudes from the screw rod 341 perpendicularly to the first direction, and the nut 342 is provided with a first stop surface 34a and a second stop surface 34b, and along the first direction, the first stop surface 34a is farther away from the screw rod 341 than the second stop surface 34b. The avoidance hole 31b includes a third sub-hole 31bc, and the bracket 33 is provided with a threaded column 331 extending along the first direction. The threaded column 331 can be threadedly matched with the fastener 34. The threaded column 331 passes through the third sub-hole 31bc and a portion of it abuts against the circuit control board 32. In the projection plane perpendicular to the first direction, the projection of the threaded column 331 is completely within the projection range of the third sub-hole 31bc.The threaded post 331 is provided with a threaded hole 33a extending in the first direction. The threaded hole 33a is open on the first side along the first direction, and the end face on the first side of the threaded post 331 forms a fourth stop surface 331a. The fastener 34 is provided with a third stop surface 34c. Both the circuit control board 32 and the third stop surface 34c are in contact with the fourth stop surface 331a, so that the screwing depth of the thread of the bracket 33 and the fastener 34 reaches the maximum value. The protective box 31 is a suction plastic part. The protective box 31 includes two box covers 311. The two box covers 311 are connected to each other and can rotate relative to each other with the connection position as the rotation axis, so that the two box covers 311 cover and enclose each other along the first direction to form an installation cavity 31a. One of the two box covers 311 is provided with an installation groove 311a, and the other is provided with a fixing protrusion 3111. One side of the installation groove 311a is open. In the state where the two box covers 311 are closed to each other, the fixing protrusion 3111 is inserted into the installation groove 311a along the first direction through the open position of the installation groove 311a and is pressed and fitted with the inner wall of the installation groove 311a in a direction perpendicular to the first direction. The box cover 311 is provided with a through hole 311b. The battery management unit 30 further includes a tree-shaped rivet 50. The tree-shaped rivet 50 includes a limiting part 51, an installation rod 52 and a barb part 53. The installation rod 52 is arranged on one side of the limiting part 51, and the barb part 53 is arranged on the side of the installation rod 52 perpendicular to the direction opposite to the installation rod 52 and the limiting part 51. Along the direction away from the installation rod 52, the barb part 53 extends obliquely towards the limiting part 51. In the state where the two box covers 311 are closed to each other, the installation rod 52 passes through the two through holes 311b communicated with each other of the two box covers 311. The limiting part 51 is located on the first side of the two box covers 311 along the first direction and is in contact with the box cover 311 on the first side. At least one barb part 53 is located on the second side of the two box covers 311 along the first direction, and the end of the barb part 53 close to the limiting part 51 is in contact with the box cover 311 on the second side.

[0202] The embodiment of the present application further provides an energy storage device, and the energy storage device includes the battery device 100 in any one of the foregoing embodiments.

[0203] In this way, it is beneficial to reduce the risk that the circuit control board 32 is displaced relative to the protective box 31 and is not protected during the operation of the energy storage device, and is beneficial to improving the service life.

[0204] The embodiment of the present application further provides an electrical device. The electrical device includes the battery device 100 or the energy storage device in any one of the foregoing embodiments, and the battery device 100 is used as the power source of the electrical device.

[0205] In this way, it is beneficial to reduce the risk that the circuit control board 32 is displaced relative to the protective box 31 and is not protected during the operation of the electrical device, and is beneficial to improving the service life.

[0206] The embodiment of the present application further provides a battery management unit 30, refer to Figures 3 to 8, the battery management unit 30 is used for electrically connecting with the electrical components in the battery device 100. The battery management unit 30 includes a circuit control board 32, a protective box 31, a bracket 33 and a fastener 34.

[0207] The circuit control board 32 is used for electrically connecting with the electrical components, and the circuit control board 32 is provided with mounting holes 32a penetrating along a first direction.

[0208] The protective box 31 is provided with a mounting cavity 31a and an avoidance hole 31b. At least part of the circuit control board 32 is located in the mounting cavity 31a. The avoidance hole 31b communicates the mounting cavity 31a with the outside of the protective box 31, and the mounting hole 32a communicates with the outside of the protective box 31 through the avoidance hole 31b.

[0209] The fastener 34 is in threaded cooperation with the bracket 33. At least one of the bracket 33 and the fastener 34 passes through the mounting hole 32a through the avoidance hole 31b. A part of the circuit control board 32 is located between the fastener 34 and the bracket 33 along the first direction. At least one of the circuit control board 32 and the bracket 33 can be in contact with the fastener 34 along the first direction so that the screwing depth of the thread of the bracket 33 and the fastener 34 reaches the maximum value.

[0210] The various embodiments / implementation manners provided by the present utility model can be combined with each other without conflict.

[0211] The above are only the preferred embodiments of the present utility model and are not used to limit the embodiments in the present utility model. For those skilled in the art, the embodiments of the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present utility model shall be included in the protection scope of the embodiments of the present utility model.

Claims

1. A battery device, characterized in that: The battery device comprises a battery management unit, and the battery management unit comprises: The circuit control board is provided with a mounting hole penetrating along a first direction; A protective box is provided with a mounting cavity and an avoidance hole, at least part of the circuit control board is located in the mounting cavity, the avoidance hole communicates the mounting cavity with the outside of the protective box, and the mounting hole communicates with the outside of the protective box through the avoidance hole; Bracket; A fastener is threadedly matched with the bracket, at least one of the bracket and the fastener is inserted into the mounting hole through the avoidance hole, a portion of the circuit control board is located between the fastener and the bracket along the first direction, and at least one of the circuit control board and the bracket can abut against the fastener along the first direction so that the threaded screwing depth of the bracket and the fastener reaches a maximum value.

2. The battery device according to claim 1, characterized in that: The avoidance hole includes a first sub-hole, a portion of the fastener is located in the first sub-hole and abuts against the circuit control board, so that the threaded screwing depth of the bracket and the fastener reaches a maximum value, and in the projection plane perpendicular to the first direction, the projection of the fastener is completely within the projection range of the first sub-hole.

3. The battery device according to claim 1, characterized in that: The avoidance hole includes a second sub-hole, the protective box includes a first wall, the second sub-hole is arranged on the first wall, a part of the fastener extends into the mounting hole through the second sub-hole, the fastener is provided with a first stop surface, and the first stop surface is located on the side of the first wall away from the circuit control board.

4. The battery device according to claim 3, characterized in that: The distance between the first stop surface and the surface of the circuit control board along the first direction close to the first wall is a first distance, the size of the first wall along the first direction is a second distance, and the first distance is not less than the second distance.

5. The battery device according to claim 3, characterized in that: The battery management unit further includes an elastic member, which is sandwiched between the first stop surface and the first wall and is elastically deformed along the first direction.

6. The battery device according to claim 3, characterized in that: The fastener is provided with a second stop surface, and the surface of the circuit control board on one side close to the first wall along the first direction can abut against the second stop surface along the first direction, so that the threaded screwing depth of the bracket and the fastener reaches a maximum value.

7. The battery device according to claim 6, characterized in that: The fastener includes a screw and a nut. The screw is arranged on one side of the nut along the first direction and penetrates into the mounting hole. The screw is threadedly engaged with the bracket. A part of the nut protrudes from the screw perpendicular to the first direction. The nut is provided with the first stop surface and the second stop surface. Along the first direction, the first stop surface is farther away from the screw than the second stop surface.

8. The battery device according to claim 3, characterized in that: The fastener is provided with a third stop surface, and the third stop surface can be located in the mounting hole and abut against the bracket along the first direction, so that the screw-in depth of the bracket and the fastener reaches a maximum value.

9. The battery device according to claim 8, characterized in that: The fastener includes a screw, a nut and a transfer rod, the screw is located on a side of the transfer rod away from the nut along the first direction, the screw is threadedly engaged with the bracket, the transfer rod connects the nut and the screw, at least a portion of the transfer rod is located in the mounting hole, a portion of the transfer rod protrudes from the screw perpendicularly to the first direction, and at least a portion of the end surface of the protruding portion close to one side of the screw forms the third stop surface, and a portion of the nut protrudes from the transfer rod perpendicularly to the first direction, and at least a portion of the end surface of the protruding portion close to one side of the screw forms the first stop surface.

10. The battery device according to claim 1, characterized in that: The avoidance hole includes a third sub-hole, and the bracket is provided with a threaded column extending along the first direction, and the threaded column can cooperate with the fastener thread. The threaded column passes through the third sub-hole and a portion of it abuts against the circuit control board. In the projection plane perpendicular to the first direction, the projection of the threaded column is completely within the projection range of the third sub-hole.

11. The battery device according to claim 10, characterized in that: The threaded column is provided with a threaded hole extending along a first direction, the threaded hole is open along a first side of the first direction and the end face of the first side of the threaded column forms a fourth stop surface, the fastener is provided with a third stop surface, the circuit control board and the third stop surface are both in contact with the fourth stop surface, so that the threaded screwing depth of the bracket and the fastener reaches a maximum value.

12. The battery device according to claim 1, characterized in that: The protective box is a blister.

13. The battery device according to claim 1, characterized in that: The protection box includes two box covers, which are connected to each other and can rotate relative to each other with the connection position as a rotation axis, so that the two box covers are covered and enclosed along the first direction to form the installation cavity.

14. The battery device according to claim 13, characterized in that: One of the two box covers is provided with a mounting groove, and the other is provided with a fixing protrusion, and one side of the mounting groove is open. When the two box covers are covered with each other, the fixing protrusion is inserted into the mounting groove through the open position of the mounting groove along the first direction and is pressed and fitted with the inner wall of the mounting groove perpendicular to the first direction.

15. The battery device according to claim 13, characterized in that: The box cover is provided with a through hole passing through, and the battery management unit also includes a tree-type rivet, which includes a limiting portion, a mounting rod and a barb portion. The mounting rod is provided on one side of the limiting portion, and the barb portion is provided on a side of the mounting rod perpendicular to the relative direction of the mounting rod and the limiting portion. Along the direction away from the mounting rod, the barb portion extends obliquely toward the limiting portion. When the two box covers are covered with each other, the mounting rod is passed through the two through holes of the two box covers that are connected to each other. The limiting portion is located on the first side of the two box covers along the first direction and abuts against the box covers on the first side. At least one barb portion is located on the second side of the two box covers along the first direction, and one end of the barb portion close to the limiting portion abuts against the box covers on the second side.

16. An energy storage device, characterized in that: The energy storage device comprises the battery device according to any one of claims 1 to 15.

17. An electrical device, characterized in that: The electrical device comprises the battery device according to any one of claims 1 to 15 or the energy storage device according to claim 16, and the battery device is used as a power source for the electrical device.

18. A battery management unit, characterized in that: Used to electrically connect with the electrical components in the battery device, the battery management unit includes: A circuit control board, used for being electrically connected to the electrical element, the circuit control board being provided with a mounting hole penetrating along a first direction; A protective box is provided with a mounting cavity and an avoidance hole, at least part of the circuit control board is located in the mounting cavity, the avoidance hole communicates the mounting cavity with the outside of the protective box, and the mounting hole communicates with the outside of the protective box through the avoidance hole; Bracket; A fastener is threadedly matched with the bracket, at least one of the bracket and the fastener is inserted into the mounting hole through the avoidance hole, a portion of the circuit control board is located between the fastener and the bracket along the first direction, and at least one of the circuit control board and the bracket can abut against the fastener along the first direction so that the threaded screwing depth of the bracket and the fastener reaches a maximum value.

19. The battery management unit according to claim 18, characterized in that: The avoidance hole includes a second sub-hole, the protective box includes a first wall, the second sub-hole is arranged on the first wall, a part of the fastener extends into the mounting hole through the second sub-hole, the fastener is provided with a first stop surface, and the first stop surface is located on the side of the first wall away from the circuit control board.

20. The battery management unit according to claim 19, characterized in that: The fastener is provided with a second stop surface, and the surface of the circuit control board on one side close to the first wall along the first direction abuts against the second stop surface along the first direction, so that the threaded insertion depth of the bracket and the fastener reaches a maximum value.

21. The battery management unit according to claim 19, characterized in that: The fastener is provided with a third stop surface, and the third stop surface is located in the mounting hole and abuts against the bracket along the first direction to limit the insertion depth between the bracket and the fastener.

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