A flame-retardant device for the battery compartment of an electric bicycle

Abstract

This utility model provides a flame-retardant device for the battery compartment of an electric-assist bicycle, relating to the field of flame-retardant devices. The device includes an installation compartment with a cover on top. Five flame-retardant heat-absorbing gels are arranged sequentially within the inner cavity of the installation compartment. Seven mounting slots are formed on the top of each heat-absorbing gel, also arranged sequentially. Eight heat exchange plates are installed within the inner cavity of the installation compartment, adhering to the flame-retardant heat-absorbing gels. A thermally conductive pad is attached to one side of each heat exchange plate. A liquid storage compartment and a flow guide pipe are formed within the inner cavity of each heat exchange plate. This flame-retardant device for the electric-assist bicycle battery compartment prevents excessively high temperatures inside the compartment from prolonged high-power discharge or high-temperature environments, ensuring stable battery performance, comprehensively protecting the battery from multi-directional impacts, and extending battery life.

Description

Technical Field

[0001] This utility model relates to a flame-retardant device for the battery compartment of an electric-assisted bicycle, specifically a flame-retardant device for the battery compartment of an electric-assisted bicycle, belonging to the technical field of flame-retardant devices. Background Technology

[0002] Electric-assisted bicycles (often referred to as "e-bikes" or "assisted bikes") are a type of transportation that combines the traditional cycling experience with electric assistance. They are powered by human pedaling and equipped with a small electric motor, battery, and smart sensors. They can automatically output auxiliary power based on the rider's pedaling force and road conditions (such as slope and resistance). This retains the healthy attributes of cycling while significantly reducing physical exertion during long-distance commutes, uphill climbs, or headwind rides.

[0003] The prior art patent application number (202323575485.0) entitled "A Flame-Retardant Structure for a Battery Compartment of an Electric-Assisted Bicycle" describes a mounting box with an inner partition and a receiving cavity spaced apart on one side of the partition. The receiving cavity contains a buffer assembly. Multiple movable rods are movably connected through the inside of both sides of the battery compartment. One end of each movable rod is fixedly connected to a limiting plate inside the battery compartment. A spring is fitted between the limiting plate on the movable rod and the battery compartment. This invention uses limiting plates inside the battery compartment to fix both sides of the battery compartment.

[0004] Although existing bicycle battery compartments are equipped with ventilation holes, they rely solely on natural ventilation for heat dissipation, which is inefficient. When the battery is used for extended periods of high-power discharge or in high-temperature environments, it may not be able to dissipate heat in time, leading to excessively high temperatures inside the battery compartment. This can affect battery performance and lifespan, and even increase the risk of fire. Therefore, new technical solutions are needed to address this issue. Utility Model Content

[0005] The purpose of this invention is to provide a flame-retardant device for the battery compartment of an electric bicycle to solve the above-mentioned problems. This addresses the issue that existing technologies rely solely on natural ventilation for heat dissipation, resulting in low heat dissipation efficiency and the inability to dissipate heat in a timely manner when the battery is used for extended periods of high-power discharge or in high-temperature environments.

[0006] This utility model is achieved through the following technical solution: a flame-retardant device for the battery compartment of an electric bicycle.

[0007] The device includes an installation compartment with a cover on top. The inner cavity of the installation compartment contains five flame-retardant heat-absorbing gels arranged sequentially. The top of each flame-retardant heat-absorbing gel has seven installation slots arranged sequentially to form a closed protective space. The flame-retardant heat-absorbing gels can suppress fire and absorb heat, and the installation slots enable the orderly partitioning of multiple batteries.

[0008] Preferably, the inner cavity of the installation chamber is provided with eight heat exchange plates, which are attached to the flame-retardant heat-absorbing gel. A thermally conductive pad is bonded to one side of the heat exchange plate to expand the heat diffusion area. The thermally conductive pad reduces thermal resistance, improves heat conduction efficiency, and accelerates heat dissipation.

[0009] Preferably, the heat exchange plate has a liquid storage chamber in its inner cavity and a flow guide pipe in its inner cavity, and the flow guide pipe is connected to the liquid storage chamber to form an active liquid cooling heat dissipation, which improves heat dissipation efficiency, avoids heat dissipation dead zones, and achieves uniform temperature control.

[0010] Preferably, seven heat-conducting strips are fixedly connected to the other side of the heat exchange plate. The heat-conducting strips are located inside the mounting groove and are in contact with the flame-retardant heat-absorbing gel. A through groove is provided on the top of the heat-conducting strip to shorten the heat transfer path, enhance the synergistic effect of heat dissipation and flame retardancy, and facilitate positioning.

[0011] Preferably, four mounting cylinders are fixedly connected to both walls of the inner cavity of the mounting chamber, and the mounting cylinders are arranged in sequence. The inner cavity of the mounting cylinder is filled with damping oil, a sealing ring is bonded to one side of the mounting cylinder, and a buffer spring is embedded in the inner cavity of the mounting cylinder. The symmetrical buffer support, damping oil absorbs high-frequency vibration, sealing ring prevents leakage, and buffer spring absorbs large impact.

[0012] Preferably, a connecting rod is inserted into one side of the mounting cylinder, one end of the connecting rod passes through the mounting cylinder and extends into the inner cavity of the mounting cylinder, and a pressure plate is fixedly connected to one end of the connecting rod. A through hole is opened on one side of the pressure plate, and the through holes are evenly distributed in sequence to transmit impact force. The pressure plate ensures buffer stability, and the through holes enhance the damping effect and improve adaptability to different vibrations.

[0013] Preferably, a convex mounting bracket is fixedly connected to the other end of the connecting rod, a positioning plate is fixedly connected to one side of the convex mounting bracket, and two friction cylinders are fixedly connected to one side of the convex mounting bracket. The integrated components work together, the positioning plate prevents the battery from shifting, and the friction cylinders cooperate with the friction rod to consume vibration energy.

[0014] Preferably, two mounting plates are fixedly connected to the outer side of the mounting cylinder, and a friction rod is fixedly connected to one side of the mounting plate. One end of the friction rod passes through the convex mounting frame, and the outer side of the friction rod contacts the inner side of the friction cylinder, thus stably supporting the friction rod. The friction pair consumes vibration energy, guides the movement of the convex mounting frame, and enhances structural stability.

[0015] This utility model provides a flame-retardant device for the battery compartment of an electric bicycle, which has the following beneficial effects: 1. This flame-retardant device for the battery compartment of an electric-assist bicycle utilizes a battery separation flame-retardant mechanism. The flame-retardant heat-absorbing gel itself possesses flame-retardant properties, directly preventing the spread of flames during thermal runaway of a single battery. Simultaneously, its heat absorption capacity rapidly absorbs battery heat. Combined with a heat exchange plate adhered to the gel, heat can be further conducted and dispersed, overcoming the shortcomings of traditional methods that rely solely on separators for flame retardancy and are insufficient in handling extreme high temperatures, thus reducing the risk of fire. The heat exchange plate improves the heat transfer efficiency with the gel through thermally conductive pads. The coolant in the storage compartment can flow evenly through the guide branch pipes, quickly removing heat. The heat-conducting strips inside the mounting slots can directly contact the battery surface, transferring the core heat of the battery to the heat exchange plate. Furthermore, the through-slots of the heat-conducting strips assist air circulation, solving the problem of low heat dissipation efficiency in traditional natural ventilation. This prevents the battery from being discharged at high power for extended periods or from becoming too hot inside the compartment under high-temperature conditions, ensuring stable battery performance.

[0016] 2. The flame-retardant device for the battery compartment of this electric-assist bicycle, through the battery fixing mechanism and the buffer spring, can initially offset the conventional vibration and impact force, while the damping oil in the mounting cylinder flows through the through hole of the pressure plate to generate damping force, which can effectively absorb the energy of large-amplitude or high-frequency vibrations (such as when riding over bumpy roads), and avoid the buffer failure after the spring fatigues and deforms; at the same time, the cooperation between the friction rod and the friction cylinder can further weaken the vibration transmission, comprehensively protect the battery from multi-directional impacts, and extend the battery life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall frontal three-dimensional structure of this utility model; Figure 2 This is a schematic diagram of the front sectional view of the present invention; Figure 3 This is a schematic diagram of the battery separation flame-retardant mechanism of this utility model; Figure 4 This is a schematic diagram of the battery fixing mechanism of this utility model; [Explanation of Key Component Symbols] 1. Installation compartment; 101. Compartment cover; 2. Flame-retardant heat-absorbing gel; 201. Mounting groove; 3. Heat exchange plate; 301. Thermal pad; 302. Liquid storage tank; 303. Flow guide branch pipe; 4. Heat-conducting strip; 401, through groove; 5. Mounting cylinder; 501. Damping oil; 502. Sealing ring; 503. Buffer spring; 6. Connecting rod; 601. Pressure plate; 602. Through hole; 7. Convex mounting bracket; 701. Positioning plate; 702. Friction cylinder; 8. Mounting plate; 801. Friction rod. Detailed Implementation

[0018] This utility model provides a flame-retardant device for the battery compartment of an electric bicycle.

[0019] Example 1, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The device includes an installation chamber 1, with a chamber cover 101 on the top. The inner cavity of the installation chamber 1 is provided with five flame-retardant heat-absorbing gels 2, which are arranged in sequence. The top of the flame-retardant heat-absorbing gels 2 is provided with seven installation slots 201, which are arranged in sequence.

[0020] Please refer to it again. Figure 1 , Figure 2 and Figure 3 The inner cavity of the installation chamber 1 is provided with eight heat exchange plates 3. The heat exchange plates 3 are attached to the flame-retardant heat-absorbing gel 2. A heat-conducting pad 301 is bonded to one side of the heat exchange plate 3. A liquid storage chamber 302 is opened in the inner cavity of the heat exchange plate 3. A flow guide pipe 303 is opened in the inner cavity of the heat exchange plate 3 and is connected to the liquid storage chamber 302. Seven heat-conducting strips 4 are fixedly connected to the other side of the heat exchange plate 3. The heat-conducting strips 4 are located inside the installation groove 201 and are attached to the flame-retardant heat-absorbing gel 2. A through groove 401 is opened on the top of the heat-conducting strips 4.

[0021] The battery fixing mechanism is centered around the mounting cylinder 5, connecting rod 6, and convex mounting bracket 7. Combined with a buffer spring 503, damping fluid 501, and friction components, it achieves stable fixing and vibration protection. After the battery is placed in the mounting compartment 1, the positioning plate 701 on the convex mounting bracket 7 fits against the side of the battery. The symmetrically distributed mounting cylinders 5 and connecting rod 6 on both sides provide support, clamping the battery horizontally and limiting its lateral displacement. When the vehicle experiences vibration or impact, the impact force is transmitted through the positioning plate 701 and convex mounting bracket 7 to the connecting rod 6, pushing the pressure plate 6. The buffer spring 503 inside the compression mounting cylinder 5 is initially absorbed by the deformation of the buffer spring 503. At the same time, the pressure plate 601 squeezes the damping oil 501. The damping oil 501 flows through the through hole 602 on the pressure plate 601 to generate damping force to consume vibration energy. When the convex mounting bracket 7 moves, the friction cylinder 702 on its side slides relative to the friction rod 801 on the mounting plate 8 to form additional damping. The friction rod 801 can also guide the movement direction of the convex mounting bracket 7 to ensure that the fixed structure remains stable during the buffering process.

[0022] Example 2, please refer to again. Figure 1 , Figure 2 and Figure 4 Four mounting cylinders 5 are fixedly connected to both walls of the inner cavity of the mounting chamber 1, and the mounting cylinders 5 are arranged in sequence. The inner cavity of the mounting cylinder 5 is filled with damping oil 501. A sealing ring 502 is bonded to one side of the mounting cylinder 5. A buffer spring 503 is embedded in the inner cavity of the mounting cylinder 5. A connecting rod 6 is inserted into one side of the mounting cylinder 5. One end of the connecting rod 6 passes through the mounting cylinder 5 and extends into the inner cavity of the mounting cylinder 5. A pressure plate 601 is fixedly connected to one end of the connecting rod 6. A through hole is opened on one side of the pressure plate 601. 602, and through holes 602 are evenly distributed in sequence. The other end of the connecting rod 6 is fixedly connected to a convex mounting bracket 7. A positioning plate 701 is fixedly connected to one side of the convex mounting bracket 7. Two friction cylinders 702 are fixedly connected to one side of the convex mounting bracket 7. Two mounting plates 8 are fixedly connected to the outside of the mounting cylinder 5. A friction rod 801 is fixedly connected to one side of the mounting plate 8. One end of the friction rod 801 passes through the convex mounting bracket 7 and the outside of the friction rod 801 contacts the inside of the friction cylinder 702.

[0023] The battery separation and flame-retardant mechanism achieves separation, protection, flame retardancy, and heat dissipation through the coordinated action of flame-retardant heat-absorbing gel 2 and heat exchange components. Five sequentially arranged flame-retardant heat-absorbing gels 2 divide the inner cavity of the mounting chamber 1 into independent areas. The mounting groove 201 at the top is used to place batteries individually, achieving physical separation of the batteries to prevent heat transfer or fault propagation between them. Furthermore, the flame-retardant heat-absorbing gel 2 itself possesses flame-retardant properties, which can suppress the spread of flames when the battery experiences high temperatures or a fire. The heat generated by the battery operation is conducted to the heat exchange plate 3 via the heat-conducting strip 4 inside the mounting groove 201. 2. It also absorbs heat from the battery and heat-conducting strip 4 through direct contact. The heat-conducting pad 301 on one side of the heat exchange plate 3 enhances the adhesion with the flame-retardant heat-absorbing gel 2, reduces thermal resistance, and improves the heat transfer efficiency from the gel to the heat exchange plate 3. The coolant in the liquid storage tank 302 inside the heat exchange plate 3 circulates through the guide branch pipe 303, evenly dispersing the heat to the entire heat exchange plate 3 and dissipating it quickly. At the same time, the through groove 401 at the top of the heat-conducting strip 4 forms an air circulation channel, which, together with the air convection inside and outside the installation chamber 1, further assists in heat dissipation and ensures the stability of the battery operating temperature.

[0024] Working principle: The positioning plate 701 on the convex mounting bracket 7 fits against the side of the battery. With the support of the mounting cylinders 5 and connecting rods 6 symmetrically distributed on both sides, the battery is clamped horizontally, limiting its lateral displacement. When the vehicle is subjected to vibration or impact, the impact force is transmitted through the positioning plate 701 and the convex mounting bracket 7 to the connecting rod 6, pushing the pressure plate 601 to compress the buffer spring 503 inside the mounting cylinder 5. The buffer spring 503 deforms and initially absorbs the impact energy. At the same time, the pressure plate 601 squeezes the damping oil 501. The damping oil 501 flows through the through hole 602 on the pressure plate 601, generating damping force to consume vibration energy. When the convex mounting bracket 7 moves, the friction cylinder 702 on its side slides relative to the friction rod 801 on the mounting plate 8, forming additional damping. The friction rod 801 also guides the movement direction of the convex mounting bracket 7, ensuring that the fixed structure remains stable during the buffering process. Five flame-retardant heat-absorbing gels 2 arranged in sequence fill the mounting chamber 1. The cavity is divided into independent areas, and the mounting groove 201 at the top is used to place the battery separately, realizing the physical separation of the batteries to avoid heat transfer or fault propagation between batteries. The flame-retardant heat-absorbing gel 2 itself has flame-retardant properties, which can suppress the spread of flames when the battery is at high temperature or in case of fire. The heat generated by the battery operation is conducted to the heat exchange plate 3 through the heat-conducting strip 4 inside the mounting groove 201. The flame-retardant heat-absorbing gel 2 also absorbs the heat from the battery and the heat-conducting strip 4 through direct contact. The heat-conducting pad 301 on one side of the heat exchange plate 3 enhances the fit with the flame-retardant heat-absorbing gel 2, reduces thermal resistance and improves the heat conduction efficiency from the gel to the heat exchange plate 3. The coolant in the liquid storage tank 302 inside the heat exchange plate 3 circulates through the guide branch pipe 303, which evenly distributes the heat to the entire heat exchange plate 3 and dissipates it quickly. At the same time, the through groove 401 at the top of the heat-conducting strip 4 forms an air circulation channel, which, together with the air convection inside and outside the mounting cavity 1, further assists in heat dissipation and ensures the stability of the battery operating temperature.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An electrically assisted bicycle battery compartment fire retardant device comprising a mounting compartment (1), characterized in that: The top of the installation compartment (1) is provided with a compartment cover (101). The inner cavity of the installation chamber (1) is provided with five flame-retardant heat-absorbing gels (2), and the flame-retardant heat-absorbing gels (2) are arranged in sequence. The top of the flame-retardant heat-absorbing gels (2) is provided with seven installation slots (201), and the installation slots (201) are arranged in sequence.

2. An electrically assisted bicycle battery compartment fire blocking device according to claim 1, characterized in that: The inner cavity of the installation chamber (1) is provided with eight heat exchange plates (3), the heat exchange plates (3) are attached to the flame-retardant heat-absorbing gel (2), and a heat-conducting pad (301) is attached to one side of the heat exchange plates (3).

3. An electrically assisted bicycle battery compartment fire blocking device according to claim 2, wherein: The heat exchange plate (3) has a liquid storage tank (302) in its inner cavity and a flow guide pipe (303) in its inner cavity, and the flow guide pipe (303) is connected to the liquid storage tank (302).

4. An electrically assisted bicycle battery compartment fire blocking device according to claim 3, wherein: Seven heat-conducting strips (4) are fixedly connected to the other side of the heat exchange plate (3). The heat-conducting strips (4) are located inside the mounting groove (201) and are in contact with the flame-retardant heat-absorbing gel (2). A through groove (401) is provided on the top of the heat-conducting strips (4).

5. An electrically assisted bicycle battery compartment fire blocking device according to claim 4, characterised in that: The inner walls of the installation chamber (1) are fixedly connected with four installation cylinders (5), and the installation cylinders (5) are arranged in sequence. The inner cavity of the installation cylinder (5) is filled with damping oil (501), a sealing ring (502) is bonded to one side of the installation cylinder (5), and a buffer spring (503) is embedded in the inner cavity of the installation cylinder (5).

6. An electrically assisted bicycle battery compartment fire blocking device according to claim 5, wherein: A connecting rod (6) is inserted into one side of the mounting cylinder (5). One end of the connecting rod (6) passes through the mounting cylinder (5) and extends into the inner cavity of the mounting cylinder (5). A pressure plate (601) is fixedly connected to one end of the connecting rod (6). A through hole (602) is opened on one side of the pressure plate (601), and the through holes (602) are evenly distributed in sequence.

7. A flame-retardant device for the battery compartment of an electric-assisted bicycle according to claim 6, characterized in that: The other end of the connecting rod (6) is fixedly connected to a convex mounting bracket (7), a positioning plate (701) is fixedly connected to one side of the convex mounting bracket (7), and two friction cylinders (702) are fixedly connected to one side of the convex mounting bracket (7).

8. An electrically assisted bicycle battery compartment fire blocking device according to claim 7, characterized in that: Two mounting plates (8) are fixedly connected to the outer side of the mounting cylinder (5). A friction rod (801) is fixedly connected to one side of the mounting plate (8). One end of the friction rod (801) passes through the convex mounting bracket (7) and the outer side of the friction rod (801) contacts the inner side of the friction cylinder (702).

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