Braking structure of energy storage device and energy storage device

Abstract

The application discloses an energy storage device and a braking structure thereof. The braking structure comprises a shell, a wheel and a braking assembly. The wheel is rotatably connected with the shell, and a clamping groove is arranged on the wheel surface of the wheel. The braking assembly is arranged on the shell and comprises a braking piece. The braking piece is used for clamping the clamping groove and is configured to: when the wheel rotates in a first direction, the braking piece is in contact with the wheel surface and moves relatively along the wheel surface, and the braking piece does not clamp into the clamping groove; and when the wheel is static and the braking piece clamps into the clamping groove, the wheel is prohibited from rotating in a second direction, and the first direction is opposite to the second direction. The braking structure and the energy storage device are characterized in that the clamping groove is arranged on the wheel surface of the wheel, the braking piece can be clamped and matched with the clamping groove, the braking piece automatically clamps or separates from the clamping groove according to the motion state of the wheel, the braking piece slides along the wheel surface when the wheel rotates in the first direction, no braking interference is generated, the braking piece automatically clamps into the clamping groove when the wheel is static, and the reverse hill sliding is prevented, and no additional operation such as hand pushing or foot stepping is needed to realize the functions of stopping and walking.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, specifically to a braking structure for an energy storage device and an energy storage device. Background Technology

[0002] Energy storage devices, such as energy storage power sources, inevitably need to be moved and transported during actual use. To save effort, wheels are usually designed. While wheels facilitate the movement of energy storage power sources, current wheels either lack braking functionality or require passive braking by manually or by foot. In transportation scenarios where energy storage devices are propelled uphill by wheels, they cannot achieve immediate stop-and-go operation. Summary of the Invention

[0003] This application provides a braking structure for an energy storage device and an energy storage device.

[0004] In a first aspect, this application provides a braking structure for an energy storage device, the braking structure including a housing, a wheel, and a braking assembly. The wheel is rotatably connected to the housing, and a groove is provided on the wheel surface. The braking assembly is disposed on the housing and includes a braking element. The braking element is used to engage with the groove and is configured such that: when the wheel rotates about a first direction, it contacts the wheel surface and moves relative to the wheel surface without engaging the groove; when the wheel is stationary and the braking element is engaged in the groove, it prevents the wheel from rotating about a second direction, the first direction being opposite to the second direction.

[0005] In some embodiments, the slots include at least two slots, which are evenly distributed along the circumference of the wheel.

[0006] In some embodiments, the depth of the slot is greater than or equal to one-third of the difference between the inner and outer diameters of the wheel, and does not exceed half of the difference.

[0007] In some embodiments, the brake is capable of deformation, wherein when the wheel rotates about a first direction, the brake deforms to disengage from the slot and slide along the wheel surface; and when the wheel is stationary, the brake returns to its original deformation and engages with the slot.

[0008] In some embodiments, the braking assembly further includes a drive unit. The drive unit is connected to the brake element and configured to drive the brake element to move, causing the brake element to switch between a first state and a second state, wherein: when the brake element is in the first state, the brake element engages with the slot to brake the wheel; and when the brake element is in the second state, the brake element disengages from the slot to release the brake on the wheel.

[0009] In some embodiments, the drive unit includes a switch, a connector, and an elastic element. The switch is movably mounted on the housing and can switch between a first position and a second position on the housing. When the switch is in the first position, the brake is in the first state; when the switch is in the second position, the brake is in the second state. The connector is rotatably mounted on the housing via a connecting shaft and connects the switch and the brake. The connector is configured to transmit the motion of the switch relative to the housing to the brake, thereby causing the brake to rotate and switch between the first and second states. The elastic element is connected at opposite ends to the switch and the housing, respectively, and is configured to store elastic potential energy that would reset the switch to the first position when the switch is in the second position.

[0010] In some embodiments, in the direction of movement of the switch member, the housing is provided with a first mating portion and a second mating portion spaced apart from each other; the switch member includes a trigger portion and an elastic engaging portion. The trigger portion is configured to receive an external force and move relative to the housing under the action of the external force. The engaging portion is connected to the trigger portion and can unfold or tighten relative to the trigger portion under the action of a force. When the switch member is in the first position, the engaging portion is in a first unfolded degree and engages with the first mating portion; when the switch member is in the second position, the engaging portion is in a second unfolded degree and engages with the second mating portion, so that the switch member can remain in the second position even after the external force on the trigger portion is removed, wherein the second unfolded degree is less than the first unfolded degree.

[0011] In some embodiments, the second mating part is provided with a guide part at the lower edge of the movement direction of the switch member. The guide part is configured to guide the engaging part to move outward of the housing when the switch member is in the second position and is moved away from the first mating part by force, so as to gradually release the engagement with the second mating part and return to the first unfolded degree. The elastic member is further configured to drive the switch member to reset to the first position when the engaging part returns to the first unfolded degree by using the elastic potential energy.

[0012] In some embodiments, the housing has an opening communicating between the interior and exterior of the housing; the trigger portion includes a first sub-part, a second sub-part, and a third sub-part. The first sub-part is disposed at the opening and includes a first side and a second side facing away from each other in the thickness direction, the first side facing the interior of the housing and the second side facing the exterior of the housing. The second sub-part is disposed on the first side and connected to the connector. The third sub-part is disposed on the second side and protrudes outward relative to the housing, and the third sub-part is configured to receive external force.

[0013] Secondly, this application also provides an energy storage device, which includes the braking structure and battery device described in any of the above embodiments. The battery device is disposed within the housing.

[0014] The braking structure and energy storage device of this application, by setting a groove on the wheel surface, allows the braking component to engage with the groove. The braking component automatically engages or disengages from the groove according to the wheel's movement state. When the wheel rotates in the first direction, the braking component slides along the wheel surface without causing braking interference. When the wheel is stationary, the braking component automatically engages with the groove to prevent reverse slippage. It can achieve instant stop and start without the need for additional operations such as manual operation or foot operation.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein: Figure 1 This is a perspective view of the braking structure of the energy storage device in some embodiments of this application; Figure 2 yes Figure 1 A three-dimensional schematic diagram of the wheel showing the braking structure; Figure 3 yes Figure 1 The diagram shows the brake component of the braking assembly in the first state of the braking structure shown, where the dashed line represents the position of the brake component in the second state. Figure 4 yes Figure 1 The diagram shows the brake component of the braking assembly in the second state of the braking structure shown, where the dashed line represents the position of the brake component in the first state. Figure 5 yes Figure 1 The diagram shows a three-dimensional representation of the braking assembly in the braking structure, wherein the braking element in the braking assembly is in the first state; Figure 6 yes Figure 5The diagram shows a three-dimensional representation of the braking component in a second state after it moves downward under external force. Figure 7 yes Figure 6 The diagram shows a three-dimensional representation of a braking assembly that first applies a downward force, then removes the force and moves upward to restore the brake to its first state. Figure 8 yes Figure 5 A three-dimensional schematic diagram of the drive unit of the braking assembly shown; Figure 9 yes Figure 8 A three-dimensional schematic diagram of the switching element of the drive unit shown; Figure 10 These are three-dimensional schematic diagrams of energy storage devices in some implementation methods.

[0017] The reference numerals in the detailed embodiments are as follows: 1000 energy storage devices; Braking structure 100; Housing 10, outer surface of housing 101, first mating part 11, second mating part 13, side wall 131, opening 15, guide part 17; Wheel 30, wheel surface 31, slot 33; Wheel axle 40; Braking assembly 50, braking element 51, drive unit 53, switch element 531, trigger part 5311, first sub-part 53111, first side 53112, second side 53114, second sub-part 53113, third sub-part 53115, engaging part 5313, connecting element 533, elastic element 535; Battery device 300; Pull rod 500, first direction X1, second direction X2. Detailed Implementation

[0018] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0019] In the description of this application, it should be understood that the terms "depth", "upper", "lower", "front", "rear", "both ends", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] In this application, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] Energy storage devices (such as energy storage power supplies and storage batteries) inevitably need to be moved and transported during practical use. To save effort, wheels are usually designed. While wheels facilitate the movement of energy storage power supplies, current wheels either lack braking functionality or require passive braking by manually or foot-operated brake pads. In transportation scenarios where the energy storage device is propelled uphill by wheels, it cannot achieve immediate stopping and starting using the wheels alone. To address this issue, this application provides a braking structure 100 for an energy storage device. Figure 1 (as shown) and energy storage device 1000 ( Figure 10 (As shown).

[0024] Please see Figures 1 to 3 The braking structure 100 of the energy storage device provided in some embodiments of this application includes a housing 10, a wheel 30, and a braking assembly 50. The wheel 30 is rotatably connected to the housing 10, and a groove 33 is provided on the wheel surface 31 of the wheel 30. The braking assembly 50 is disposed on the housing 10 and includes a braking member 51, which is used to engage with the groove 33. The braking member 51 is configured such that: when the wheel 30 rotates about a first direction X1, the braking member 51 contacts the wheel surface 31 and moves relative to the wheel surface 31, but does not engage with the groove 33; when the wheel 30 is stationary and the braking member 51 is engaged with the groove 33, the wheel 30 is prohibited from rotating about a second direction X2, wherein the first direction X1 and the second direction X2 are opposite.

[0025] The housing 10 serves as the external frame structure of the energy storage device 1000, housing and protecting the internal components of the energy storage device 1000, and providing a mounting base for the wheels 30 and the braking assembly 50. The housing 10 can be formed from metal materials (e.g., aluminum alloy, steel plate) through stamping, bending, or welding processes, or it can be integrally formed from engineering plastics (e.g., ABS, polycarbonate) through injection molding. In some embodiments, the bottom of the housing 10 has axle holes or axle brackets for mounting the wheels 30. The wheels 30 are mounted on these axle holes or axle brackets via axles 40, thereby achieving a rotatable connection with the housing 10. The bottom of the housing 10 also has mounting positions for mounting the braking assembly 50, such as mounting holes, mounting grooves, or snap-fit ​​structures. The braking assembly 50 is fixed to the housing 10 via these mounting positions. The housing 10 can be a one-piece structure or a split structure, for example, composed of a bottom plate, side plates, and a top plate. In other embodiments, the bottom of the housing 10 may be provided with multiple wheels 30, such as two, three, or four wheels 30, and this application does not limit this. This application only illustrates an example where the bottom of the housing 10 is provided with two wheels 30.

[0026] The wheel 30 is the component in the braking structure 100 that contacts the ground and enables rolling movement. The wheel 30 is generally disc-shaped or cylindrical, with a central axle hole through which the axle 40 passes and connects to the housing 10, allowing the wheel 30 to rotate freely around the axis of the axle 40. The wheel 30 can be made of metal (e.g., steel, aluminum alloy), wear-resistant engineering plastics (e.g., nylon, polyurethane), or a combination of metal and rubber, such as a metal core with a rubber surface to increase friction with the ground and prevent slippage. The rotatable connection between the wheel 30 and the housing 10 includes, but is not limited to, axle bolt connection, ball bearing connection, and sliding bearing connection, as long as it allows the wheel 30 to rotate freely relative to the housing 10.

[0027] The wheel surface 31 is the outer circumferential surface of the wheel 30, that is, the part of the wheel 30 that directly contacts the ground during rolling. In this embodiment, the wheel surface 31 is a continuous rotating surface that extends circumferentially along the wheel 30. The wheel surface 31 may be provided with anti-slip patterns, such as straight lines, diagonal lines, herringbone patterns, or granular protrusions, to enhance the adhesion between the wheel 30 and the ground. The material of the wheel surface 31 may be the same as or different from the main body material of the wheel 30. For example, if the main body of the wheel 30 is metal, the wheel surface 31 may be covered with a layer of rubber or polyurethane material to improve wear resistance and quietness.

[0028] The groove 33 is a recessed structure provided on the wheel surface 31, used to cooperate with the brake member 51 to limit and brake the wheel 30. The groove 33 is formed by recessing from the surface of the wheel surface 31 radially inward into the wheel 30. The opening of the groove 33 faces outward of the wheel 30 so that the brake member 51 can enter the groove 33 and engage with it. The shape of the groove 33 can be various, such as a rectangular groove, a V-shaped groove, a U-shaped groove, or a trapezoidal groove. Among them, a trapezoidal groove (i.e., the groove opening width is greater than the groove bottom width) is conducive to the smooth sliding of the brake member 51 into and out, while a rectangular groove can provide a greater engaging force and a more stable braking effect. There is at least one groove 33. In this embodiment, there are multiple grooves 33, which are arranged at intervals along the circumference of the wheel surface 31. So that during the rotation of the wheel 30, no matter what angle the wheel 30 stops at, at least one groove 33 can correspond to the position of the brake member 51, so that the brake member 51 can engage in time. The depth of the groove 33 points radially toward the axle 40 along the wheel 30. Its specific depth can be designed based on the wall thickness of the wheel 30 and the required braking force. It must ensure sufficient engagement depth for the brake component 51 after insertion to prevent accidental disengagement, while also ensuring that the residual wall thickness of the wheel 30 at the groove 33 meets strength requirements to prevent breakage of the wheel 30 under stress. The width of the groove 33 should match the thickness or width of the brake component 51, so that after the brake component 51 is engaged in the groove 33, the two side walls of the groove 33 can limit the brake component 51, preventing the wheel 30 from rotating around the second direction X2.

[0029] The braking assembly 50 is a component in the braking structure 100 used to generate braking action. The braking assembly 50 is disposed on the housing 10 and located around the wheel 30. The braking assembly 50 is fixed to the housing 10 and does not move with the rotation of the wheel 30. The braking assembly 50 can be mounted on the bottom plate of the housing 10 or on the side wall of the housing 10, as long as its position allows the braking element 51 of the braking assembly 50 to engage with the groove 33 on the wheel surface 31. The braking assembly 50 can be a one-piece structure or an assembly of multiple parts. The fixing methods of the braking assembly 50 to the housing 10 include, but are not limited to, threaded fastening connections (e.g., screws, bolts), snap-fit ​​connections, welding connections, or riveting connections. A detachable connection method is preferred for ease of maintenance and replacement. The mounting position of the braking assembly 50 avoids the wheel axle 40 and other moving parts of the wheel 30 to prevent interference.

[0030] The brake element 51 is a component in the brake assembly 50 that directly engages with the groove 33 of the wheel 30 to achieve braking. The brake element 51 is disposed on the housing 10, with at least a portion located near the wheel surface 31 of the wheel 30 to contact and engage with the groove 33 on the wheel surface 31. The connection between the brake element 51 and the housing 10 is a movable connection; for example, the brake element 51 can be rotatably or slidably disposed on the housing 10, thereby allowing switching between a position engaged with the groove 33 and a position disengaged from the groove 33. The shape and size of the brake element 51 need to match the groove 33: when the brake element 51 is engaged in the groove 33, at least a portion of the brake element 51 is embedded inside the groove 33, and the outer wall of the brake element 51 abuts against the inner wall of the groove 33, thereby restricting the relative rotation of the wheel 30. The brake element 51 can adopt various structural forms, such as rod-shaped, plate-shaped, or block-shaped. The end of the brake element 51 that contacts the wheel surface 31 can be provided with a rounded transition or a chamfer to reduce resistance and wear when sliding on the wheel surface 31.

[0031] The brake element 51 is configured to contact and move relative to the wheel surface 31 when the wheel 30 rotates around the first direction X1, without engaging with the slot 33. Specifically, when the wheel 30 rotates around the first direction X1 (e.g., counterclockwise), the wheel surface 31 rotates with the wheel 30, and the slot 33 moves circumferentially. At this time, the brake element 51 remains in contact with the wheel surface 31. When the slot 33 rotates to the position of the brake element 51, because the setting angle, shape, or installation method of the brake element 51 is designed such that it will not fall into the slot 33, but slides through the opening of the slot 33 and continues to contact other areas of the wheel surface 31. During this process, relative sliding occurs between the brake element 51 and the wheel surface 31, but it does not produce significant resistance or locking effect on the rotation of the wheel 30 in the first direction X1. Therefore, the wheel 30 can rotate freely around the first direction X1.

[0032] The brake 51 is also configured to prevent the wheel 30 from rotating in the second direction X2 when the wheel 30 is stationary and the brake 51 is engaged in the slot 33. Specifically, when the wheel 30 is stationary and the brake 51 is located in and engaged with a slot 33, the sidewall of the slot 33 blocks the brake 51. At this time, if the wheel 30 tends to rotate in the second direction X2 (e.g., clockwise), the sidewall of the slot 33 will abut against the brake 51, preventing the wheel 30 from continuing to rotate in the second direction X2. This is because the brake 51 is fixed to the housing 10, and its position relative to the housing 10 remains unchanged, while the slot 33 rotates with the wheel 30. When the wheel 30 attempts to rotate in the second direction X2, one sidewall of the slot 33 will press against the brake 51 and receive a reverse supporting force from the brake 51, thereby preventing the wheel 30 from rotating in the second direction X2. Thus, the braking assembly 50 has a one-way braking function, that is, it allows the wheel 30 to rotate freely in the first direction X1, but prevents the wheel 30 from rotating in the second direction X2 when it is stationary, thereby effectively preventing the energy storage device 1000 from sliding down the slope in the second direction X2 (i.e., the downward direction).

[0033] The first direction X1 and the second direction X2 are two opposite directions in which the wheel 30 rotates around its axle 40. In the application scenario of the energy storage device 1000, the first direction X1 usually corresponds to the forward direction of the energy storage device 1000, while the second direction X2 corresponds to the backward or downward direction of the energy storage device 1000. For example, when the operator pulls the energy storage device 1000 uphill, the wheel 30 rotates around the first direction X1, and the brake 51 does not cause braking interference, allowing the operator to pull smoothly. When the operator stops pulling while uphill, the wheel 30 tends to rotate along the second direction X2 (i.e., the downward direction). At this time, the brake 51 engages with the slot 33 and prevents the wheel 30 from rotating along the second direction X2, thus stopping the energy storage device 1000 on the slope and achieving the effect of stopping and starting immediately.

[0034] In this embodiment, the braking structure 100 provides a groove 33 on the wheel surface 31 of the wheel 30, and the braking component 51 can engage with the groove 33. The braking component 51 automatically engages or disengages from the groove 33 according to the movement state of the wheel 30. When the wheel 30 rotates along the first direction X1, the braking component 51 slides along the wheel surface 31 without causing braking interference. When the wheel 30 is stationary, the braking component 51 automatically engages with the groove 33 to prevent reverse slippage. It can achieve immediate stop and start without the need for additional operations such as manual operation or foot operation.

[0035] Please continue reading. Figure 1 and Figure 2 In this embodiment, the slot 33 includes at least two slots, and the at least two slots 33 are evenly distributed along the circumference of the wheel 30.

[0036] In this embodiment, there are at least two slots 33, unlike schemes that only have a single slot. The number of slots 33 can be determined based on the diameter of the wheel 30 and the required braking response sensitivity. For example, for a wheel 30 with a smaller diameter, two or three slots 33 can be provided; for a wheel 30 with a larger diameter, four, six, eight, or even more slots 33 can be provided. The more slots 33 there are, the higher the frequency at which the braking component 51 encounters the slots 33 during wheel 30 rotation, and the faster the wheel 30 can find a slot 33 to engage with near any stopping position, resulting in a faster braking response speed.

[0037] At least two slots 33 are evenly distributed along the circumference of the wheel 30, meaning that the distance between any two adjacent slots 33 is equal, and the arc length or angle interval between any two adjacent slots 33 in the circumferential direction of the wheel 30 is the same. For example, when there are two slots 33, the two slots 33 are arranged 180° apart in the circumferential direction of the wheel 30; when there are three slots 33, the three slots 33 are arranged 120° apart in the circumferential direction of the wheel 30; when there are four slots 33, the four slots 33 are arranged 90° apart in the circumferential direction of the wheel 30, and so on. The evenly distributed slots 33 ensure that the wheel 30 has a uniform braking point in the circumferential direction. No matter what angle the wheel 30 rotates to, the angular travel of the brake element 51 from the nearest slot 33 is equal, thereby ensuring the consistency of the braking response of the wheel 30 throughout the entire circumferential range and avoiding situations where the braking is sensitive in some angle ranges and sluggish in others.

[0038] When the wheel 30 rotates around the first direction X1, at least two slots 33 rotate together with the wheel surface 31 and pass sequentially along the circumference of the brake member 51. Since the slots 33 are uniformly distributed circumferentially, the brake member 51 experiences a consistent motion state when passing each slot 33; that is, the brake member 51 encounters each slot 33 sequentially at the same time interval and relative angle, and slides sequentially past the edge of each slot 33. During this process, the brake member 51 experiences periodic but consistent slight impacts or vibrations, which do not produce significant resistance or locking effect on the rotation of the wheel 30 in the first direction X1.

[0039] When the wheel 30 is stationary, since there are at least two slots 33 evenly distributed circumferentially, the probability that the brake element 51 will fall into a slot 33 when the wheel 30 stops is significantly increased compared to a scheme with only a single slot. Furthermore, regardless of the angle at which the wheel 30 stops, the maximum angular travel of the brake element 51 from the nearest slot 33 is relatively small, thus improving the braking response speed and reliability. After the brake element 51 is engaged in the slot 33, the sidewall of the slot 33 blocks the brake element 51, preventing the wheel 30 from rotating around the second direction X2.

[0040] The braking structure 100 of this embodiment provides at least two circumferentially evenly distributed slots 33 on the wheel surface 31 of the wheel 30, so that the braking component 51 can enter the slots 33 with a smaller rotation angle stroke to achieve braking during the rotation of the wheel 30, thus shortening the braking response time. At the same time, the evenly distributed multiple slots 33 enable the braking component 51 to quickly enter the slots 33 near any rotation position, further improving the timeliness and smoothness of braking.

[0041] Please see Figure 2 In some embodiments, the depth of the slot 33 is greater than or equal to one-third of the difference between the inner and outer diameters of the wheel 30, and does not exceed half of that difference.

[0042] The wheel 30 is roughly annular or disc-shaped, and has an outer diameter and an inner diameter. The outer diameter is the diameter of the outermost circumference of the wheel 30, that is, the diameter of the circumference of the wheel surface 31, which determines the contact position between the wheel 30 and the ground and the overall size of the wheel 30. The inner diameter is the diameter at the central axle hole of the wheel 30. Half of the difference between the outer diameter and the inner diameter is the radial wall thickness of the wheel 30.

[0043] The depth of the groove 33 refers to the dimension of the indentation from the surface of the wheel surface 31 along the radial direction of the wheel 30, that is, the downward distance of the bottom of the groove 33 relative to the surface of the wheel surface 31. The depth of the groove 33 is limited to being greater than or equal to 1 / 3 of the difference between the outer diameter and the inner diameter, and not exceeding half of that difference.

[0044] Setting the depth of the groove 33 to be greater than or equal to one-third of the difference between the outer and inner diameters ensures that the groove 33 has sufficient depth. With sufficient depth, when the brake element 51 engages with the groove 33, there is a larger contact area between the brake element 51 and the side wall of the groove 33, resulting in a more stable and reliable engagement. If the groove 33 is too shallow (e.g., less than one-third of the difference), the brake element 51 will only be shallowly embedded in the wheel surface 31. When the wheel 30 is subjected to a large reverse torque, the brake element 51 is prone to slipping out of the groove 33, leading to brake failure.

[0045] Setting the depth of the groove 33 to no more than half the difference between the outer and inner diameters is to prevent the groove 33 from being too deep and weakening the structural strength of the wheel 30. If the depth of the groove 33 exceeds half of this difference, it means that the bottom of the groove 33 has already passed through the inner wall of the wheel 30 and penetrated the wall thickness of the wheel 30. This would result in the wheel 30 having too little or even no residual wall thickness at the groove 33, making the wheel 30 extremely prone to breakage or deformation at the groove 33 when bearing load. Controlling the depth of the groove 33 to within half of this difference ensures that the wheel 30 still retains sufficient material thickness at the bottom of the groove 33, thereby maintaining the overall structural strength and load-bearing capacity of the wheel 30.

[0046] Taking wheel 30 with an outer diameter of 100mm and an inner diameter of 70mm as an example, the difference between the outer diameter and the inner diameter is 30mm, and 1 / 3 of the difference is 10mm. Therefore, the depth of the slot 33 is configured to be greater than or equal to 10mm and not more than 15mm.

[0047] The braking structure 100 of this embodiment limits the depth of the groove 33 to between 1 / 3 and half of the difference between the outer diameter and inner diameter of the wheel 30. This ensures that the groove 33 has sufficient depth to form a stable and reliable engagement with the brake component 51, preventing the brake component 51 from accidentally dislodging under force due to excessive groove depth, while also preventing the structural strength of the wheel 30 from being weakened due to excessive groove depth. A reasonable balance is achieved between braking reliability and the structural strength of the wheel 30.

[0048] Please see Figures 2 to 4 In some embodiments, the brake element 51 is capable of deformation. When the wheel 30 rotates about the first direction X1, the brake element 51 deforms to disengage from the slot 33 and slide along the wheel surface 31; when the wheel 30 is stationary, the brake element 51 returns to its original deformation and engages with the slot 33.

[0049] The braking component 51 is capable of deformation; that is, when subjected to an external force, the shape of the braking component 51 changes, and it can return to its original shape after the external force is removed. This deformation capability gives the braking component 51 an adaptive adjustment characteristic when interacting with the slot 33. The deformation of the braking component 51 can be elastic deformation, that is, the deformation is linearly related to the external force and can be completely restored after the external force is removed; it can also be elastoplastic deformation, that is, it contains a certain plastic deformation component, but elastic deformation is preferred to ensure consistent deformation recovery after multiple uses.

[0050] The braking component 51 can be made of elastic materials, such as spring steel, stainless steel spring wire, beryllium bronze alloy, or titanium alloy, or engineering elastomer materials such as polyoxymethylene (POM), nylon (PA66), or thermoplastic polyurethane (TPU). The braking component 51 can be designed with structures such as elastic arms, cantilever beams, arc-shaped springs, or coil springs. These structures provide the required deformation capacity and restoring force through geometric optimization. For example, the braking component 51 can be a cantilever spring with one end fixed to the housing 10 and the other end suspended and extending towards the wheel surface 31. The cantilever structure can undergo bending deformation under stress and return to its original shape elastically after the stress is removed. The braking component 51 can also be designed as an arc-shaped structure; this application demonstrates an example of a curved braking component 51.

[0051] In this embodiment, the braking structure 100 utilizes the deformation capability of the braking component 51 itself. When the wheel 30 rotates in the forward direction, it smoothly passes over the slot 33 without jamming through elastic deformation. When the wheel 30 is stationary, it automatically resets and locks into the slot 33 by relying on the deformation restoring force. The automatic switching between avoiding obstacles when passing and locking in when stopping is achieved by utilizing the material properties of the braking component 51 itself. No additional power or control components are required. The structure is simple and the response is reliable.

[0052] Please see Figures 3 to 7 In some embodiments, the braking assembly 50 further includes a drive unit 53. The drive unit 53 is connected to the brake member 51 and configured to drive the brake member 51 to move, causing the brake member 51 to switch between a first state and a second state. In the first state, the brake member 51 engages with the slot 33 to brake the wheel 30. In the second state, the brake member 51 disengages from the slot 33 to release the brake on the wheel 30.

[0053] The drive unit 53 is a power transmission component in the braking assembly 50 used to drive the movement of the brake element 51. The drive unit 53 is disposed on the housing 10, and power transmission is achieved between it and the brake element 51 through a mechanical connection (e.g., hinge, fixed connection, or transmission connection). The drive unit 53 can be manually driven or electrically driven. In the manual drive mode, the drive unit 53 may include operating elements such as buttons, levers, knobs, or handles, which the operator uses to press, flick, or rotate to drive the brake element 51. In the electric drive mode, the drive unit 53 may include power elements such as motors, electromagnets, or shape memory alloys, which are controlled by electrical signals to drive the movement of the brake element 51. In this embodiment, the drive unit 53 is preferably manually driven to simplify the structure and reduce costs. The drive unit 53 may be disposed on the top, side wall, or near the handle of the housing 10.

[0054] The drive unit 53 is configured to drive the brake element 51 to move. The movement of the brake element 51 includes, but is not limited to, rotational movement, sliding movement, or oscillating movement. Taking rotational movement as an example, the drive unit 53 can drive the brake element 51 to rotate around an axis, thereby changing the relative position between the end of the brake element 51 and the wheel surface 31. Taking sliding movement as an example, the drive unit 53 can drive the brake element 51 to reciprocate along a straight line, causing the brake element 51 to approach or move away from the wheel surface 31. The specific transmission method between the drive unit 53 and the brake element 51 can include a linkage mechanism, a cam mechanism, a rack and pinion mechanism, or a wire rope traction mechanism, etc. The drive of the brake element 51 by the drive unit 53 is controllable, meaning that the operator can change the position or orientation of the brake element 51 at any time as needed through the drive unit 53.

[0055] The brake element 51 switches between a first state and a second state. The first state refers to the state where the brake element 51 performs its braking function. In this state, the brake element 51 can engage with the slot 33, thereby preventing the wheel 30 from rotating around the second direction X2 when the wheel 30 is stationary. In the first state, the brake element 51 is in its working position; for example, the end of the brake element 51 is located on the movement path of the slot 33, and the brake element 51 can automatically engage with the slot 33 when the wheel 30 is stationary. The second state is the state where the brake element 51 releases its braking function. In this state, the brake element 51 is disengaged from the slot 33, and regardless of whether the wheel 30 is rotating or stationary, the brake element 51 will not engage with the slot 33. In the second state, the brake element 51 deviates from its working position; for example, the end of the brake element 51 is lifted off the wheel surface 31 or moved out of the movement path of the slot 33, allowing the wheel 30 to rotate freely around the first direction X1 or the second direction X2 without interference from the brake element 51.

[0056] When the brake element 51 is in the first state, it engages with the slot 33 to brake the wheel 30. The engagement of the brake element 51 with the slot 33 means that a locking or abutting relationship is formed between the brake element 51 and the slot 33, including direct and indirect engagement. Direct engagement means that at least a portion of the brake element 51 is embedded inside the slot 33, making contact with the inner wall of the slot 33. Indirect engagement means that the brake element 51 engages with the slot 33 through an intermediate element. In the first state, the brake element 51 is in a ready or working position capable of engaging with the slot 33. When the wheel 30 is stationary, the brake element 51 can engage with the slot 33, thereby preventing the wheel 30 from rotating around the second direction X2.

[0057] When the brake element 51 is in the second state, the brake element 51 disengages from the slot 33, thereby releasing the brake on the wheel 30. Disengagement means that the brake element 51 and the slot 33 no longer form an engaging or abutting relationship; the brake element 51 disengages from the slot 33 and is no longer on the movement path of the slot 33. In the second state, the brake element 51 is driven to a position away from the wheel surface 31 or deviating from the path of the slot 33, allowing the wheel 30 to rotate freely in any direction without being restricted by the brake element 51. After the braking function is released, the energy storage device 1000 can be freely propelled in any situation (e.g., on flat ground or a slope).

[0058] In this embodiment, the braking component 50 drives the braking element 51 to switch between the first state and the second state by setting the driving unit 53. The user can actively release the brake according to actual needs, so that the energy storage device 1000 can flexibly switch to the non-braking state in situations where braking to prevent slippage is not required (such as pushing on flat ground or when free sliding is required), which takes into account both braking safety and usage flexibility, and improves applicability under different working conditions.

[0059] Please see Figure 8 In some embodiments, the drive unit 53 includes a switch 531, a connector 533, and an elastic member 535. The switch 531 is movably disposed on the housing 10 and can switch between a first position and a second position of the housing 10. When the switch 531 is in the first position, the brake 51 is in a first state; when the switch 531 is in the second position, the brake 51 is in a second state. The connector 533 is rotatably disposed on the housing 10 via a connecting shaft and connects the switch 531 and the brake 51. The connector 533 is configured to transmit the movement of the switch 531 relative to the housing 10 to the brake 51, thereby causing the brake 51 to rotate and switch between the first and second states. The opposite ends of the elastic member 535 are connected to the switch 531 and the housing 10, respectively, and are configured to store elastic potential energy that would reset the switch 531 to the first position when the switch 531 is in the second position.

[0060] The switch 531 is a component in the drive unit 53 that is directly operated by the operator to input control commands. The switch 531 is mounted on the housing 10, and its connection to the housing 10 is a movable connection, such as a sliding connection, a rotating connection, or a pressing connection. The switch 531 can move relative to the housing 10 between a first position and a second position. The first position and the second position are two different spatial positions of the switch 531 relative to the housing 10. For example, in a sliding connection, the first position is when the switch 531 is at one end of the sliding stroke, and the second position is when the switch 531 is at the other end of the sliding stroke; in a pressing connection, the first position is the pop-out position when the switch 531 is not pressed, and the second position is the retracted position when the switch 531 is pressed.

[0061] The switch 531 and the brake 51 are linked together by the connector 533. The position of the switch 531 directly determines the state of the brake 51: when the operator places the switch 531 in the first position, the brake 51 is in the first state (braking state); when the operator places the switch 531 in the second position, the brake 51 is in the second state (released braking state).

[0062] The connector 533 is rotatably mounted on the housing 10 via a connecting shaft and connects the switch 531 and the brake 51. The connector 533 is configured to transmit the movement of the switch 531 relative to the housing 10 to the brake 51, thereby causing the brake 51 to rotate and switch between a first state and a second state.

[0063] Connector 533 is an intermediate element in drive unit 53 used to transmit motion and force. Connector 533 is mounted on housing 10 via a connecting shaft, which serves as the fulcrum for rotation of connector 533. Connector 533 can swing or rotate relative to housing 10 around this connecting shaft. One end of connector 533 is connected to switch 531, and the other end is connected to brake 51. When switch 531 moves relative to housing 10, it drives one end of connector 533 to move, causing connector 533 to rotate around the connecting shaft. The other end of connector 533 then experiences a movement in the opposite direction or at a different amplitude, thereby transmitting the motion of switch 531 to brake 51. Connector 533 can be in the form of a torsion spring, linkage, rocker arm, shift fork, or turntable, etc. In this embodiment, connector 533 is preferably a torsion spring.

[0064] The connecting member 533 is configured to drive the brake member 51 to rotate. The rotation of the brake member 51 is the rotation of the brake member 51 about an axis, which can be the connecting shaft itself or another axis parallel to the connecting shaft. Through the rotation of the brake member 51, the end of the brake member 51 can be lifted away from or close to the wheel surface 31, thereby realizing the switching between the brake member 51 in a first state (located near the wheel surface 31, and can cooperate with the slot 33) and a second state (lifted away from the wheel surface 31, and disengaged from the slot 33).

[0065] The two opposite ends of the elastic element 535 are connected to the switch element 531 and the housing 10, respectively. The elastic element 535 is configured to store elastic potential energy that would reset the switch element 531 to the first position when the switch element 531 is in the second position.

[0066] The elastic element 535 is a component in the drive unit 53 used to provide a reset force. The elastic element 535 can take various forms, such as a compression spring, tension spring, torsion spring, leaf spring, or elastic rubber block. One end of the elastic element 535 is connected to the switch element 531, and the other end is connected to the housing 10, forming an elastic connection between the switch element 531 and the housing 10. When the switch element 531 is in the first position, the elastic element 535 is in a natural state or a slightly compressed / stretched state, storing little or no elastic potential energy. When the operator switches the switch element 531 from the first position to the second position, the movement of the switch element 531 causes the elastic element 535 to deform (e.g., be compressed), storing elastic potential energy during this deformation. This elastic potential energy has a tendency to drive the switch element 531 from the second position back to the first position. When the operator releases the external force on the switch element 531, if there is no other locking mechanism, the elastic potential energy stored in the elastic element 535 will drive the switch element 531 to automatically reset to the first position.

[0067] In this embodiment, the drive unit 53 works in conjunction with the switch 531, the connector 533, and the elastic element 535. The user only needs to operate the switch 531 to drive the brake 51 to rotate through the connector 533, thus switching the braking state. The operation is simple. At the same time, the connector 533 is rotatably mounted on the housing 10 via a rotating shaft, which makes the transmission path clear and the force transmission efficiency high. When the braking state is released, the elastic element 535 stores elastic potential energy, providing a reliable power source for subsequent automatic reset without the need for additional energy.

[0068] Please see Figure 9 In this embodiment, the housing 10 has a first mating portion 11 and a second mating portion 13 spaced apart. The switch member 531 includes a trigger portion 5311 and a locking portion 5313. The trigger portion 5311 is configured to receive an external force and move relative to the housing 10 under the action of the external force. The locking portion 5313 is connected to the trigger portion 5311 and can be unfolded or tightened relative to the trigger portion 5311 under the action of force. When the switch member 531 is in the first position, the locking portion 5313 is in the first unfolded position and engages with the first mating portion 11; when the switch member 531 is in the second position, the locking portion 5313 is in the second unfolded position and engages with the second mating portion 13, so that the switch member 531 can remain in the second position even after the external force on the trigger portion 5311 is removed, and the second unfolded position is smaller than the first unfolded position.

[0069] The first mating part 11 and the second mating part 13 are structures provided on the housing 10 for engaging with the engaging part 5313 of the switch 531 to achieve positioning and holding of the switch 531 at different positions. The first mating part 11 and the second mating part 13 are arranged sequentially along the movement direction of the switch 531, and are spaced apart from each other, that is, there is a certain distance between the first mating part 11 and the second mating part 13 in the movement direction of the switch 531. The first mating part 11 and the second mating part 13 can adopt various structural forms, such as grooves, protrusions, snap holes, stepped surfaces, or toothed grooves. In this embodiment, the first mating part 11 and the second mating part 13 are first slots 11 and second slots 13 provided on the inner wall of the housing 10 to form a engagement with the engaging part 5313. The first mating part 11 corresponds to the first position of the switch 531, and the second mating part 13 corresponds to the second position of the switch 531.

[0070] The trigger portion 5311 is the part of the switch member 531 used to receive external force. The trigger portion 5311 is exposed outside the housing 10 or partially exposed outside the housing 10 so that the operator's fingers or other tools can contact the trigger portion 5311. After receiving external force (e.g., pressing, pushing, flicking, or stepping), the trigger portion 5311 moves relative to the housing 10 in a predetermined direction, thereby driving the entire switch member 531 to move relative to the housing 10. The shape of the trigger portion 5311 can be designed as a button, lever, slider, pedal, or handle, depending on the operation method. In this embodiment, the trigger portion 5311 is pedal-shaped, and the operator drives the switch member 531 to move by stepping on the trigger portion 5311.

[0071] The engaging portion 5313 is the part of the switch member 531 used to engage with the first mating portion 11 and the second mating portion 13 of the housing 10 to achieve positioning and retention. The engaging portion 5313 is connected to the trigger portion 5311 and can move with the movement of the trigger portion 5311. The engaging portion 5313 is elastic, that is, the engaging portion 5313 can deform under force, thereby expanding or contracting relative to the trigger portion 5311. Expanding means that the engaging portion 5313 expands outward relative to the trigger portion 5311, increasing the outer contour dimension of the switch member 531; contracting means that the engaging portion 5313 contracts inward relative to the trigger portion 5311, decreasing the outer contour dimension of the switch member 531. The elasticity of the engaging portion 5313 can be achieved through material elasticity (e.g., the engaging portion 5313 is made of elastic plastic or spring steel) or through structural elasticity (e.g., the engaging portion 5313 is designed as a claw structure with elastic arms). The opening or closing of the engaging part 5313 relative to the triggering part 5311 is controlled by the interaction force between the engaging part 5313 and the inner wall or mating part of the housing 10.

[0072] When the switch 531 is in the first position, the engaging portion 5313 is in a first degree of expansion and engages with the first mating portion 11. The first degree of expansion is the state in which the engaging portion 5313 is expanded to a large extent relative to the trigger portion 5311. In the first degree of expansion, the outer contour dimensions of the engaging portion 5313 match the dimensions of the first mating portion 11, allowing the engaging portion 5313 to be inserted into or engaged with the first mating portion 11, forming a positioning engagement. This engagement allows the switch 531 to be stably held in the first position.

[0073] When the switch 531 is in the second position, the engaging portion 5313 is in a second degree of expansion and engages with the second mating portion 13. The second degree of expansion is less than the first degree of expansion, meaning that the engaging portion 5313 is less expanded relative to the trigger portion 5311 in the second position, and is in a relatively tightened state. In the second degree of expansion, the outer contour dimensions of the engaging portion 5313 match the dimensions of the second mating portion 13, allowing the engaging portion 5313 to be inserted into or engaged with the second mating portion 13, forming a positioning engagement. Because the second degree of expansion is less than the first degree of expansion, the engaging portion 5313 is in a relatively tightened state in the second position. In this state, the engagement between the engaging portion 5313 and the second mating portion 13 allows the switch 531 to remain in the second position even after the external force on the trigger portion 5311 is removed. In other words, even if the operator releases the trigger part 5311, due to the cooperation between the engaging part 5313 and the second engaging part 13, the switch part 531 will not automatically reset to the first position under the elastic potential energy of the elastic member 535, but will remain in the second position, thereby realizing the self-locking holding function of releasing the braking state.

[0074] The braking structure 100 of this embodiment provides a first mating part 11 and a second mating part 13 on the housing 10, and an elastic engaging part 5313 on the switch member 531. By utilizing the engagement of the engaging part 5313 with different mating parts at different degrees of expansion, the switch member 531 can remain in the second position even if the external force is removed after switching to the second position. This achieves a self-locking holding function for releasing the braking state. The user does not need to continuously press the switch member 531 to maintain the non-braking state, resulting in a better operating experience and less effort in use.

[0075] Please continue reading. Figure 9 In some embodiments, the second mating portion 13 is provided with a guide portion 17 at the lower edge of the movement direction of the switch member 531. The guide portion 17 is configured to guide the engaging portion 5313 to move outward from the housing 10 when the switch member 51 is in the second position and is moved away from the first mating portion 11 by force, so as to gradually release the engagement with the second mating portion 13 and return to the first unfolded degree; the elastic member 535 is also configured to drive the switch member 531 to reset to the first position when the engaging portion 5313 returns to the first unfolded degree by utilizing the elastic potential energy.

[0076] The second mating portion 13 has a lower edge in the direction of movement of the switching member 531. The lower edge is the downstream edge of the second mating portion 13 in the direction of movement of the switching member 531; that is, when the switching member 531 moves from the first position to the second position, it first passes the upper edge of the second mating portion 13, then reaches the interior of the second mating portion 13, and finally approaches the lower edge of the second mating portion 13. The lower edge is the edge that the engaging portion 5313 passes through when it disengages from the second mating portion 13.

[0077] The guide portion 17 is a guide structure located at the lower edge of the second mating portion 13. The guide portion 17 can be in the form of a slope, an arc surface, or a conical surface, and its function is to guide the movement direction of the engaging portion 5313. Figure 3 or Figure 4 As shown, the guide portion 17 is a slope, and the slope is higher on the inside and lower on the outside, that is, the height of the end of the slope near the inside of the housing 10 is higher than the height of the end of the slope near the outside of the housing 10. When the operator applies further external force to the switch 531 in the second position, causing it to continue moving away from the first mating portion 11, the engaging portion 5313 reaches the lower edge of the second mating portion 13 along the direction of movement. At this time, the guide portion 17 contacts the engaging portion 5313, and the slope or arc-shaped surface of the guide portion 17 guides the engaging portion 5313 towards the outside of the housing 10, so that the engaging portion 5313 gradually deforms towards the outside of the housing 11, thereby releasing the engagement with the second mating portion 13 (specifically the side wall 131 of the second slot 13), and the inner surface of the engaging portion 5313 facing the inside of the housing 10 fits against the outer surface 101 of the housing. During this process, the degree of unfolding of the engaging portion 5313 gradually returns from the second degree of unfolding to the first degree of unfolding.

[0078] The elastic element 535 stores elastic potential energy that would reset the switch element 531 to the first position when the switch element 531 is in the second position. When the engaging portion 5313 is released from the engagement with the second mating portion 13 by the guide portion 17, the locking effect of the engaging portion 5313 on the switch element 531 disappears, and the elastic potential energy stored in the elastic element 535 is released. This elastic potential energy drives the switch element 531 to move from the second position to the first position (i.e., reset in a direction away from the second mating portion 13). During the reset process of the switch 531, in the height direction, the engaging part 5313 first passes through the second mating part 13. However, since the inner surface of the engaging part 5313 is in contact with the outer surface 101 of the housing, the engaging part 5313 will not enter the second mating part 13 and engage with it. When the engaging part 5313 reaches the first mating part 11 in height, since the width of the first mating part 11 is relatively wide, there is no outer surface 101 of the housing in contact with the inner surface of the engaging part 5313. Therefore, the engaging part 5313 will enter the first mating part 11 at the first position and engage with it again. Since the engaging part 5313 has now returned to the first unfolded degree, its engagement with the first mating part 11 keeps the switch 531 stably in the first position, that is, the brake 51 returns to the first state (brake state).

[0079] In this embodiment, the braking structure 100 provides a guide portion 17 at the bottom end of the second mating portion 13. When the switch member 531 is in the second position and is further subjected to force, the engaging portion 5313 is guided out of the housing 10 to release the locking engagement with the second mating portion 13. Subsequently, the elastic member 535 releases its elastic potential energy and drives the switch member 531 to automatically reset to the first position, realizing the self-resetting function of automatic springback after a second press. The entire unlocking and resetting process does not require manual pulling by the user, the operation is smooth and the feedback is clear, further improving the ease of use.

[0080] Please see Figure 4 and Figure 9 In some embodiments, the housing 10 has an opening 15 communicating between the interior and exterior of the housing 10. The trigger portion 5311 includes a first sub-part 53111, a second sub-part 53113, and a third sub-part 53115. The first sub-part 53111 is disposed at the opening 15 and includes a first side and a second side facing away from each other in the thickness direction. The first side faces the interior of the housing 10, and the second side faces the exterior of the housing 10. The second sub-part 53113 is disposed on the first side and is connected to the connector 533. The third sub-part 53115 is disposed on the second side and protrudes outward relative to the housing 10. The third sub-part 53115 is configured to receive external force.

[0081] Opening 15 is a through hole or slot formed on the housing 10, penetrating the wall thickness of the housing 10 and connecting the internal space of the housing 10 with the external space. The size and shape of opening 15 match the first sub-part 53111 of trigger part 5311, so that the first sub-part 53111 can be disposed at opening 15 and move relative to housing 10 along opening 15. Opening 15 provides a motion guide channel for trigger part 5311, and also provides a structural basis for the connection of trigger part 5311.

[0082] The trigger part 5311 is the part of the switch 531 used to receive external force, and it is disposed through the opening 15. The trigger part 5311 includes a first sub-part 53111, a second sub-part 53113 and a third sub-part 53115, which are integrally formed or fixedly connected to form an integral structure.

[0083] The first sub-part 53111 is disposed at the opening 15, and its shape is adapted to the shape of the opening 15. For example, when the opening 15 is a circular through hole, the first sub-part 53111 is cylindrical; when the opening 15 is a rectangular through groove, the first sub-part 53111 is rectangular block-shaped. The first sub-part 53111 includes a first side 53112 and a second side 53114 facing away from each other in the thickness direction. The first side 53112 is the side of the first sub-part 53111 facing the interior of the housing 10, and the second side 53114 is the side of the first sub-part 53111 facing the exterior of the housing 10. The first side 53112 and the second side 53114 are spatially opposite to each other, with the first side 53112 facing the interior space of the housing 10 and the second side 53114 facing the exterior space of the housing 10.

[0084] The second sub-part 53113 is disposed on the first side 53112, that is, the second sub-part 53113 is located inside the housing 10. The second sub-part 53113 extends from the first side 53112 of the first sub-part 53111 into the housing 10. The second sub-part 53113 is connected to the connector 533, and the connection method can be a fixed connection (e.g., integral molding, welding or bonding) or a rotatable connection (e.g., hinge). The connection between the second sub-part 53113 and the connector 533 allows the movement of the trigger part 5311 to be transmitted to the connector 533 through the second sub-part 53113, and then to the brake part 51 through the connector 533.

[0085] The third sub-part 53115 is disposed on the second side 53114, that is, the third sub-part 53115 is located outside the housing 10. The third sub-part 53115 extends and protrudes from the second side 53114 of the first sub-part 53111 towards the outside of the housing 10. The third sub-part 53115 protrudes outward relative to the housing 10, that is, the third sub-part 53115 at least partially protrudes beyond the outer surface 101 of the housing, so that an operator can access and operate the third sub-part 53115 from outside the housing 10. The third sub-part 53115 is configured to receive external force, that is, the operator can press, push, or flick the third sub-part 53115 by stepping on it or using other tools, thereby transmitting the external force through the third sub-part 53115 to the entire trigger part 5311, driving the trigger part 5311 to move relative to the housing 10. The surface of the third sub-part 53115 may be provided with an anti-slip structure or an enlarged contact surface to improve operating comfort and reliability.

[0086] In this embodiment, the triggering part 5311 is divided into a first sub-part 53111, a second sub-part 53113, and a third sub-part 53115. The first sub-part 53111 is located at the opening 15 of the housing 10 to separate and cover the inside and outside. The second sub-part 53113 extends into the inside of the housing 10 and is connected to the connector 533 for transmission. The third sub-part 53115 protrudes from the outside of the housing 10 to receive external forces. The structure is compact and the functional areas are clearly defined, which not only ensures the reliability of transmission but also optimizes the operating feel.

[0087] Please see Figure 10 This application provides an energy storage device 1000, which includes a braking structure 100 and a battery device 300 as described in any of the above embodiments. The battery device 300 is disposed within the housing 10.

[0088] Energy storage device 1000 is a device capable of storing electrical energy and releasing it when needed. Specific forms of energy storage device 1000 may include portable energy storage power supplies, outdoor emergency power supplies, mobile power stations, home energy storage battery cabinets, or industrial energy storage systems. Energy storage device 1000 is typically heavy and bulky, therefore requiring wheels 30 for easy handling and movement. The external shape of energy storage device 1000 is generally box-shaped, cabinet-shaped, or trolley-shaped, with wheels 30 at the bottom and pull rods 500 or handles on the sides or top for the operator to push or pull.

[0089] The battery device 300 is the core component of the energy storage device 1000, used to store electrical energy. The battery device 300 is disposed inside the housing 10 and includes one or more battery cells. The battery cells can be of various types, such as lithium-ion batteries, lithium polymer batteries, lithium iron phosphate batteries, lead-acid batteries, or nickel-metal hydride batteries; this application does not impose any limitations on these types. The battery device 300 also includes a battery management system (BMS) for monitoring and managing parameters such as the battery's charge / discharge status, temperature, and voltage.

[0090] The energy storage device 1000 in this embodiment integrates the aforementioned braking structure 100. The braking structure 100 provides a slot 33 on the wheel surface 31 of the wheel 30, allowing the braking element 51 to engage with the slot 33. The braking element 51 automatically engages or disengages from the slot 33 depending on the movement of the wheel 30. When the wheel 30 rotates in the first direction X1, the braking element 51 slides along the wheel surface 31 without braking interference. When the wheel 30 is stationary, the braking element 51 automatically engages with the slot 33 to prevent reverse slippage. This allows for immediate stopping and starting without manual or foot operation. Therefore, the energy storage device 1000 possesses both portable mobility and automatic anti-slip braking in situations involving slopes or temporary stops. Users can flexibly release the brake according to actual road conditions, combining portability, safety, and operational flexibility, thus improving the handling experience and safety of the energy storage device 1000.

[0091] The braking structure 100 and energy storage device 1000 of this application provide a groove 33 on the wheel surface 31 of the wheel 30, and enable the brake member 51 to engage with the groove 33. The brake member 51 automatically engages or disengages from the groove 33 according to the movement state of the wheel 30. When the wheel 30 rotates in the first direction X1, the brake member 51 slides along the wheel surface 31 without causing braking interference. When the wheel 30 is stationary or moves in the second direction X2, the brake member 51 automatically engages with the groove 33 to prevent reverse slippage. It can achieve instant stop and start without the need for additional operations such as manual operation or foot operation.

[0092] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. At the same time, other implementation methods can be derived from the above embodiments, so that structural and logical substitutions and changes can be made without departing from the scope of this disclosure.

[0093] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A braking structure for an energy storage device, characterized in that, include: case; A wheel is rotatably connected to the housing, and a groove is provided on the wheel surface; and, A braking assembly, disposed on the housing, includes a braking element for engaging with the slot and configured as follows: When the wheel rotates around the first direction, the braking element contacts the wheel surface and moves relative to the wheel surface without getting stuck in the slot; When the wheel is stationary and the brake is engaged in the slot, the wheel is prohibited from rotating in a second direction, which is opposite to the first direction.

2. The braking structure according to claim 1, characterized in that, The slots include at least two, and the at least two slots are evenly distributed along the circumference of the wheel.

3. The braking structure according to claim 1, characterized in that, The depth of the slot is greater than or equal to one-third of the difference between the inner and outer diameters of the wheel, and does not exceed half of the difference.

4. The braking structure according to claim 1, characterized in that, The brake element is capable of deformation. When the wheel rotates about the first direction, the brake element deforms to disengage from the slot and slide along the wheel surface; when the wheel is stationary, the brake element returns to its original shape and engages with the slot.

5. The braking structure according to any one of claims 1 to 4, characterized in that, The braking assembly also includes: A drive unit, connected to the brake element, is configured to drive the brake element to move, causing the brake element to switch between a first state and a second state, wherein: When the brake element is in the first state, the brake element engages with the slot to brake the wheel; When the brake is in the second state, the brake disengages from the slot to release the brake on the wheel.

6. The braking structure according to claim 5, characterized in that, The driving unit includes: A switch is movably disposed on the housing and can switch between a first position and a second position of the housing. When the switch is in the first position, the brake is in the first state, and when the switch is in the second position, the brake is in the second state. A connector, rotatably mounted on the housing via a connecting shaft, connects the switch and the brake. The connector is configured to transmit the motion of the switch relative to the housing to the brake, thereby causing the brake to rotate and switch between a first state and a second state. An elastic element, with its two opposite ends connected to the switch and the housing respectively, is configured to store elastic potential energy that would reset the switch to the first position when the switch is in the second position.

7. The braking structure according to claim 6, characterized in that, In the direction of movement of the switching element, the housing is provided with a first mating portion and a second mating portion spaced apart from each other in sequence; the switching element includes: The triggering part is configured to receive an external force and move relative to the housing under the action of the external force; and, A flexible engaging portion is connected to the trigger portion and can expand or contract relative to the trigger portion under applied force; wherein: When the switch is in the first position, the engaging part is in the first unfolded position and engages with the first mating part; When the switch is in the second position, the engaging part is in the second degree of expansion and engages with the second cooperating part so that the switch can remain in the second position even after the external force on the trigger part is removed, and the second degree of expansion is less than the first degree of expansion.

8. The braking structure according to claim 7, characterized in that, The second mating part is provided with a guide part at the lower edge of the movement direction of the switch member. The guide part is configured to guide the engaging part to move outward of the housing when the switch member is in the second position and is moved away from the first mating part by force, so as to gradually release the engagement with the second mating part and return to the first unfolded degree. The elastic member is also configured to drive the switch member to reset to the first position when the engaging part returns to the first unfolded degree by using the elastic potential energy.

9. The braking structure according to claim 7, characterized in that, The housing has an opening connecting the interior and exterior of the housing; the triggering part includes: The first sub-part is disposed at the opening and includes a first side and a second side facing away from each other in the thickness direction, the first side facing the interior of the housing and the second side facing the exterior of the housing; The second sub-part is disposed on the first side and connected to the connector; and A third sub-part, disposed on the second side and protruding outward relative to the housing, is configured to receive external forces.

10. An energy storage device, comprising: The braking structure according to any one of claims 1 to 9; and, The battery assembly is disposed within the housing.

Images