Battery device and electric bicycle

Abstract

The utility model relates to battery technology field discloses a kind of battery device and electric bicycle, the battery device includes battery compartment, is set to the inside of lower pipe, the outer wall of battery compartment cooperates with the inner wall of lower pipe and forms annular flow channel, the top of battery compartment is recessed with cooling flow channel, cooling flow channel is communicated with annular flow channel;Battery pack, it is sealed to set in the inside of battery compartment, battery pack includes multiple paralleling settings along the axial direction of lower pipe electric core, the cross section of electric core is concave, for with the inner wall of battery compartment is attached. The battery device simple structure does not need complex fastening component to fix electric core, can realize quick heat dissipation simultaneously, and safety performance is high.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery device and an electric bicycle. Background Technology

[0002] The power batteries of existing electric bicycles are generally composed of multiple 18650 / 21700 small cylindrical cells connected in series and parallel. Due to the low capacity of a single 18650 / 21700 small cylindrical cell, a large number of cells need to be connected in series and parallel to meet the power demand of electric bicycles. This results in an excessive number of cells connected in series and parallel. In order to accommodate a large number of cells and ensure their operation, a relatively complex structure needs to be designed to fix and protect the cells. This will cause redundancy in the overall battery structure, which limits the improvement of the overall performance of the power battery. Moreover, the heat diffusion path between the closely arranged cells is short, which increases the risk of battery thermal runaway. This is not conducive to the development goals of electric bicycles to achieve lightweight, long range and high safety. Utility Model Content

[0003] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a battery device and an electric bicycle. The battery device has a simple structure, does not require complex fastening components to fix the battery cells, and can achieve rapid heat dissipation and high safety performance.

[0004] To achieve the above objectives, this utility model provides a battery device for powering an electric bicycle, comprising: The battery compartment is located inside the lower tube. The outer wall of the battery compartment and the inner wall of the lower tube cooperate to form an annular flow channel. The top of the battery compartment has a recessed cooling flow channel, which is connected to the annular flow channel. The battery pack is sealed inside the battery compartment. The battery pack includes a plurality of battery cells arranged side by side along the axial direction of the lower tube. The cross-section of each battery cell is concave to fit against the inner wall of the battery compartment.

[0005] Optionally, a lower tube cap is provided at the end of the lower tube away from the head tube of the electric bicycle, and a drain valve is provided on the lower tube cap, which is connected to the cooling channel.

[0006] Optionally, the lower tube cover has an annular groove on the side near the battery compartment that seals against the end face of the battery compartment. The annular groove has a concave cross-section and a sealing gasket is provided inside the annular groove.

[0007] Optionally, a battery baffle is provided inside the battery compartment, which divides the battery compartment into a cell placement chamber and a BMS chamber.

[0008] Optionally, a plurality of evenly distributed bolt through holes are provided on the mating surface of the lower tube and the lower tube cover.

[0009] Optionally, a thermally conductive silicone layer is provided on the outer side of the battery pack.

[0010] The second aspect of this utility model provides an electric bicycle, comprising: The vehicle body includes a hollow tubular down tube and a head tube, the two ends of which are connected to the handlebar stem and the front fork, respectively, and the down tube is connected to the side of the head tube. As described above, the battery device is disposed in the lower tube.

[0011] Optionally, the head tube is provided with a water injection channel, which is connected to the cooling channel.

[0012] Optionally, a water inlet is provided on the end face where the head tube connects to the handlebar stem, and the water inlet is connected to the water injection channel.

[0013] Optionally, the end face where the head tube connects to the handlebar stem is further provided with two through holes, which are distributed on both sides of the water inlet.

[0014] Through the above technical solution, the annular flow channel formed by the outer wall of the battery compartment and the inner wall of the lower tube of the battery device provided by this utility model, and the cooling flow channel that is recessed at the top of the battery compartment and connected to the annular flow channel, enable the cooling medium to fully contact the battery compartment and quickly remove the heat generated by the battery pack during operation. The cross-section of the battery cells arranged in parallel along the axial direction of the lower tube is concave, which allows the battery pack to fit tightly against the inner wall of the battery compartment. There is no need to set up an additional fixing structure for the battery pack in the lower tube. Moreover, the heat generated by the battery pack can be conducted to the battery compartment more quickly, and then transferred to the cooling medium in the cooling flow channel through the battery compartment, thereby further improving the heat dissipation efficiency and avoiding the risk of battery thermal runaway. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the installation structure of a battery device provided by this utility model; Figure 2 This is a schematic diagram of the structure of the lower tube and the head tube in this utility model; Figure 3 This is a schematic diagram of the internal structure of the lower tube and the head tube in this utility model; Figure 4 This is a schematic diagram of the lower tube cap structure in this utility model; Figure 5 This is a schematic diagram of the battery pack structure in this utility model.

[0016] Explanation of reference numerals in the attached figures 1. Battery compartment; 11. Battery baffle; 12. Cell placement chamber; 13. BMS chamber; 2. Battery pack; 3. Annular flow channel; 4. Cooling flow channel; 5. Lower pipe cover; 51. Drain valve; 52. Annular groove; 100. Lower pipe; 200. Head pipe; 201. Water injection channel; 202. Water inlet; 203. Through hole. Detailed Implementation

[0017] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0018] Combination Figure 1 , Figure 2 as well as Figure 5 As shown, the first aspect of this utility model provides a battery device for use in electric bicycles, providing power to the electric bicycles. It mainly includes a battery compartment 1 and a battery pack 2. Specifically, the battery compartment 1 is disposed inside the lower tube 100, and the outer wall of the battery compartment 1 cooperates with the inner wall of the lower tube 100 to form an annular flow channel 3. A cooling flow channel 4 is recessed at the top of the battery compartment 1 and communicates with the annular flow channel 3. The battery pack 2 is sealed inside the battery compartment 1 and includes multiple battery cells arranged side-by-side along the axial direction of the lower tube 100. The cross-section of each battery cell is concave to fit against the inner wall of the battery compartment 1.

[0019] In the technical solution provided by this utility model, the battery compartment 1 can be integrally set with the lower tube 100 of the electric bicycle. The end face of the battery compartment 1 is set to be flush with the end face of the lower tube 100, using the structure of the lower tube 100 itself as the outer shell, saving external space and reducing the weight of the whole vehicle. An annular flow channel 3 is formed between the outer wall of the battery compartment 1 and the lower tube 100. The top recessed cooling flow channel 4 is connected to the annular flow channel 3, forming a complete heat dissipation system, avoiding the problems of cell performance degradation and shortened life due to poor heat dissipation and local overheating. The battery pack 2, composed of cells with a concave cross-section, is adapted to the inner wall of the battery compartment 1 and can fit tightly against the inner wall of the battery compartment 1. This not only prevents the cells from shifting due to vibration during vehicle operation, but also allows the heat generated by the battery pack 2 to be conducted to the battery compartment 1 more quickly, and then transferred to the cooling medium in the cooling flow channel 4 through the battery compartment 1, thereby further improving heat dissipation efficiency and avoiding the risk of battery thermal runaway. At the same time, the battery pack 2 is integrally sealed in the battery compartment 1, ensuring the safe and reliable operation of the battery device.

[0020] Furthermore, combined Figure 1 and Figure 4As shown, the lower tube 100 is equipped with a lower tube cap 5 at the end away from the head tube 200 of the electric bicycle, which is used to seal the battery compartment 1 and the cooling channel 4. The lower tube cap 5 is equipped with a drain valve 51, which is connected to the cooling channel 4, so that the cooling medium can be drained during maintenance or winter storage to prevent freezing or corrosion.

[0021] Furthermore, the lower tube cover 5 has an annular groove 52 on the side near the battery compartment 1, which seals against the end face of the battery compartment 1. The annular groove 52 has a concave cross-section, which can form a tight fit with the end face of the battery compartment 1 to ensure sealing. A sealing gasket is embedded in the annular groove 52, which can further enhance the waterproof and dustproof performance and prevent the cooling medium from entering the battery compartment 1.

[0022] It is understood that in some embodiments, in order to facilitate the replacement or maintenance of the battery pack 2, the lower tube cover 5 and the lower tube 100 are detachably connected. Specifically, the mating surface of the lower tube 100 and the lower tube cover 5 is provided with a plurality of evenly distributed bolt through holes, which can be used with bolts to achieve a detachable connection.

[0023] When disassembling battery pack 2, first open the drain valve 51 to drain the cooling medium, then open the lower pipe cover 5, and the battery pack 2 can be pulled out axially for maintenance or replacement.

[0024] Similarly, during installation, battery pack 2 is pushed directly into battery compartment 1, and then the lower tube cap 5 is used to press and lock the sealing gasket.

[0025] In some embodiments, such as Figure 3 As shown, in order to position the battery pack 2, a battery baffle 11 is provided in the battery compartment 1, which divides the battery compartment 1 into a cell placement chamber 12 and a BMS chamber 13. It is understandable that the battery baffle 11 is detachably connected to the inner wall of the battery compartment 1, and the inner wall of the battery compartment 1 is provided with a protrusion that cooperates with and limits the battery baffle 11.

[0026] In some embodiments, the cross-sectional shape of the battery baffle 11 is consistent with the cross-sectional shape of the battery cell, and a gap is left between the protrusion of the battery baffle 11 and the inner top wall of the battery compartment 1.

[0027] In some embodiments, a thermally conductive silicone layer is provided on the outer side of the battery pack 2. The thermally conductive silicone layer fills the space between the battery pack 2 and the battery compartment 1, which can efficiently conduct heat, quickly transfer heat, reduce the operating temperature of the battery pack 2, buffer vibration, prevent wear, and act as an insulating barrier to prevent short circuits, thereby improving the safety and lifespan of the battery pack 2.

[0028] The second aspect of this utility model provides an electric bicycle, which includes a frame and the aforementioned battery device. Specifically, the frame includes a hollow tubular lower tube 100 and a head tube 200. The two ends of the head tube 200 are connected to the handlebar stem and the front fork, respectively. The lower tube 100 communicates with the side of the head tube 200. The battery device is disposed in the lower tube 100, saving external space, reducing redundant structures, and lowering the overall weight of the vehicle. The annular flow channel 3 and the cooling flow channel 4 formed by the lower tube 100 and the battery compartment 1 help dissipate heat from the battery device.

[0029] In some embodiments, a water injection channel 201 is provided inside the head pipe 200. The water injection channel 201 is connected to the cooling flow channel 4. Cooling medium is supplied uniformly through the water injection channel 201 of the head pipe 200, simplifying the pipeline layout.

[0030] In some embodiments, a water inlet 202 is provided on the end face of the head tube 200 that connects to the handlebar stem, and the water inlet 202 is connected to the water inlet channel 201. The water inlet 202 is located near the handlebar stem, which facilitates the replenishment or replacement of the cooling medium in daily use.

[0031] In some embodiments, the end face of the head tube 200 connected to the handlebar stem is further provided with two cable passage holes 203, which are distributed on both sides of the water inlet 202. The cable passage holes 203 facilitate cable management, and rubber sleeves can be installed at the cable passage holes 203 to protect the cable and prevent water ingress.

[0032] In summary, the electric bicycle provided by this utility model has a highly integrated frame, battery device, and cooling system with a simple structure, achieving the development goals of lightweight, long-range, and high safety for electric bicycles.

[0033] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including the combination of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A battery device for powering an electric bicycle, characterized in that, include: The battery compartment (1) is located inside the lower tube (100). The outer wall of the battery compartment (1) and the inner wall of the lower tube (100) cooperate to form an annular flow channel (3). The top of the battery compartment (1) has a recessed cooling flow channel (4), which is connected to the annular flow channel (3). The battery pack (2) is sealed inside the battery compartment (1). The battery pack (2) includes a plurality of cells arranged in parallel along the axial direction of the lower tube (100). The cross-section of the cells is concave for fitting against the inner wall of the battery compartment (1).

2. The battery device according to claim 1, characterized in that, The lower tube (100) is provided with a lower tube cover (5) at the end away from the head tube (200) of the electric bicycle. The lower tube cover (5) is provided with a drain valve (51), and the drain valve (51) is connected to the cooling channel (4).

3. The battery device according to claim 2, characterized in that, The lower tube cover (5) has an annular groove (52) on the side near the battery compartment (1) that seals against the end face of the battery compartment (1). The annular groove (52) has a concave cross-section and a sealing gasket is provided inside the annular groove (52).

4. The battery device according to claim 2, characterized in that, The battery compartment (1) is provided with a battery baffle (11), which divides the battery compartment (1) into a cell placement chamber (12) and a BMS chamber (13).

5. The battery device according to claim 2, characterized in that, The joint surface between the lower tube (100) and the lower tube cover (5) is provided with a plurality of evenly distributed bolt through holes.

6. The battery device according to claim 1, characterized in that, A thermally conductive silicone layer is provided on the outside of the battery pack (2).

7. An electric bicycle, characterized in that, include: The vehicle body includes a hollow tubular down tube (100) and a head tube (200), the two ends of which are connected to the handlebar stem and the front fork respectively, and the down tube (100) is connected to the side of the head tube (200). The battery device as described in any one of claims 1-6, wherein the battery device is disposed in the lower tube (100).

8. The electric bicycle according to claim 7, characterized in that, The head tube (200) is provided with a water injection channel (201), which is connected to the cooling channel (4).

9. The electric bicycle according to claim 8, characterized in that, The end face of the head tube (200) connected to the handlebar stem tube is provided with a water inlet (202), and the water inlet (202) is connected to the water injection channel (201).

10. The electric bicycle according to claim 9, characterized in that, The end face of the head tube (200) connected to the handlebar stem tube is also provided with two through holes (203), and the two through holes (203) are distributed on both sides of the water inlet (202).

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