Design of high-capacity multipurpose electric bicycle battery pack with heat management function

Abstract

The invention discloses a design of a high-capacity multi-purpose electric bicycle battery pack with thermal management, and relates to the technical field of battery packs, the high-capacity multi-purpose electric bicycle battery pack comprises a bottom cylinder, an upper cover and an internal module, the module comprises a module support and a battery cell, the battery cell is connected with an adapter plate through a battery cell tab, and a temperature equalizing film is attached to the top of the battery cell tab. And the inner side of the bottom cylinder is bonded with the upper part of the uniform-temperature film through a heat dissipation film. The battery pack utilizes the uniform temperature film and the heat dissipation film for heat management, the design of combining the fastener and the sealing ring is adopted, the metal bottom cylinder is only thick in wall in the thickness direction of the battery core, effective capacity expansion of the battery pack can be realized, the handle of the battery pack can be selectively arranged at different positions as required, and compatibility of the battery pack to different vehicle types is realized. The invention aims to provide the large-capacity electric bicycle battery pack with better temperature equalization effect and heat dissipation effect, the problem that heat management and battery capacity expansion are difficult to consider at the same time is solved, the internal space utilization rate of the battery pack is improved, and the comprehensive performance of the battery pack is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and specifically to a design of an electric bicycle battery pack with thermal management, large capacity and multiple uses. Background Art

[0002] An electric bicycle battery pack serves as the power source device of the vehicle to provide power for the vehicle. When the battery pack is charged and discharged, heat is generated by itself. Existing electric bicycle battery packs generally do not have a heat dissipation function, and the heat generated during battery charging and discharging cannot be transmitted outside the battery pack. The accumulated heat is likely to cause a decline in the battery's own performance, and even trigger safety problems such as battery thermal runaway in some extreme environments. Patent US20240258598A1 discloses a battery pack, which includes a battery pack housing, a plurality of batteries accommodated in the battery pack housing, and a radiator located above the batteries. The radiator stores coolant, and a plurality of heat dissipation channels are provided between the batteries and the radiator. The radiator can quickly absorb and dissipate heat in an environment with high temperature rise during fast charging, preventing thermal runaway from occurring.

[0003] The size of the electric bicycle battery pack is restricted by the vehicle body. The heat dissipation design of the electric bicycle battery pack needs to take into account the battery life and battery capacity issues: Based on the module arrangement, the outer peripheral battery cells of the electric bicycle battery pack dissipate heat better than the inner battery cells. Uneven internal and external heat dissipation will cause a large temperature difference between the battery cells, exacerbating the attenuation of battery life; the arrangement of its internal battery cells needs to consider the outer contour size and heat dissipation requirements. Adding additional water-cooled plates or L-shaped fin cooling solutions will occupy the space of the battery cells, resulting in a decrease in battery capacity.

[0004] In order to increase the battery capacity, those skilled in the art have made some designs to improve the space utilization rate of the battery pack. For example, occupying the space of the airtight structure to increase the capacity, but the decrease in airtightness is likely to increase the risk of water ingress into the battery pack; some expanded design casings use glue sealing, but the glue sealing makes the outer casing non-detachable, seriously reducing the maintenance and repair performance of the battery pack. In addition, the plastic outer casing is restricted by its own strength and cannot restrain the expansion of the battery cells. The expansion may cause the casing to crack, thereby reducing the battery performance and even causing the battery to get water.

[0005] In addition, limited by the battery pack layout, common battery packs are only suitable for installation in either the vehicle seat bucket or under the footrest, and it is difficult to accommodate both types of vehicles.

[0006] Therefore, there is an urgent need in the art for an electric bicycle battery pack with thermal management, large capacity and multiple uses. Summary of the Invention

[0007] The purpose of the present invention is to provide an electric bicycle battery pack with uniform heat dissipation, large capacity, light weight and multiple uses, so as to optimize the internal space of the battery pack and improve the comprehensive performance of the battery pack.

[0008] To solve the above technical problems, the present invention specifically provides the following technical solutions: A design of an electric bicycle battery pack with thermal management and large capacity and multi - purpose, including a bottom cylinder, an upper cover and internal modules. The module includes a module bracket and battery cells. The battery cells are connected to a transfer board through cell tabs, and a temperature - equalizing film is attached to the top of the cell tabs. Based on the module arrangement, the heat dissipation of the outer - perimeter battery cells of the electric bicycle battery pack is better than that of the internal battery cells. Uneven internal and external heat dissipation will cause a large temperature difference between the battery cells, exacerbating the attenuation of battery life. In the present invention, the cell tabs are connected in series with the transfer board by laser welding to achieve internal electrical connection of the module. Among them, the cell tabs are made of copper foil or aluminum foil, connecting the inside of the battery cells. Heat dissipation from the tabs is one of the highest heat - dissipation paths of the battery cells. Bonding two high - thermal - conductivity temperature - equalizing films on the upper end of the transfer board can effectively reduce the temperature difference between each battery cell in the module, achieve a better temperature - equalizing effect, and thus improve the comprehensive performance of the battery pack and increase its service life. The temperature - equalizing film can be a graphene heat - dissipation film. The graphene heat - dissipation film has a high thermal - conductivity coefficient and its own thickness is only at the millimeter level, occupying a small size in the height direction inside the battery pack. Using a small - size structure can reduce the temperature difference and heat - equalizing between the battery cells, and the remaining space is convenient for increasing the height of the internal battery cells, improving the capacity of a single battery cell to achieve the goal of expanding the capacity of the whole pack. In addition, since the temperature - equalizing film is fixed above the transfer board, the temperature - equalizing film and the transfer board cover the cell tabs. Even if water enters from the outside layer, the inner layer still has a protective effect, preventing rainwater from corroding the circuit.

[0009] The inner side of the bottom cylinder is bonded to the upper side of the temperature - equalizing film through a heat - dissipation film. The heat - dissipation film is foldable and has partial double - sided adhesive. After assembly, the folding angle of the heat - dissipation film is 85° - 95°. The heat - dissipation film has partial double - sided adhesive. One end of the heat - dissipation film is bonded to the inner side of the bottom cylinder. After the module is installed in the bottom cylinder, the other end of the heat - dissipation film is bonded to the upper side of the temperature - equalizing film to establish a heat - dissipation channel from the battery to the external environment. Using the high - thermal - conductivity performance of the heat - dissipation film to achieve heat dissipation from the battery to the outer shell. After bonding, the folding angle of the heat - dissipation film is 85° - 95°, achieving optimization of the heat - conduction path and simplifying the space layout. Bonding the heat - dissipation film to the temperature - equalizing film can improve the heat - dissipation efficiency. The addition of the heat - dissipation film establishes a heat - exchange channel between the battery and the external environment, which can effectively reduce the temperature of the battery pack itself. The heat - dissipation film is pasted on the inner side of the bottom cylinder before installing the module. The heat - dissipation film is foldable and has partial double - sided adhesive, which is convenient for the assembly and repair of the battery pack. There is a gap between the bottom cylinder and the module, allowing a certain degree of volume expansion of the battery cells. The heat - dissipation film pasted between the bottom cylinder and the module can laterally fix the module, reducing the displacement of the battery cells. At the same time, the heat - dissipation film distributed on all four sides has good flexibility and can act as a buffer structure to disperse vibration energy, making the battery pack both lightweight and vibration - resistant, adapting to the high - frequency vibration of urban roads. Preferably, the heat - dissipation film can be a graphene heat - dissipation film. The graphene heat - dissipation film has a small thickness, high heat - dissipation efficiency, and low cost.

[0010] Specifically, there are at least two heat dissipation films, which are arranged around the center of the bottom cylinder. Having at least two heat dissipation films, dispersedly arranged above the temperature equalizing film, can save the usage amount of the heat dissipation film and improve the heat dissipation efficiency. The present invention improves the heat dissipation efficiency at the tab by means of the heat dissipation film, conducts the heat of the battery cell to the external environment, avoids the decline of the battery's own performance caused by the accumulation of battery heat, and prevents thermal runaway. This design is simple to operate. Compared with liquid cooling, air cooling or phase change material cooling in the prior art, it occupies less space, has high heat dissipation efficiency, and low cost, which is beneficial to the expansion of the battery pack and is applicable to the field of electric two-wheel vehicles.

[0011] Both the bottom cylinder and the upper cover are made of metal materials. Adopting a metal cylindrical shell structure, it has high internal compressive strength, can effectively limit the disorderly expansion in the middle and later stages of the battery, and increase the cycle life of the battery cell; the metal shell has a relatively high residual value in subsequent recycling, which can effectively reduce the full-life cycle usage cost of the battery pack.

[0012] Among them, the bottom cylinder and the upper cover are connected by fasteners, and a sealing ring is provided below the upper cover. The two sides of the upper cover compress the sealing ring through bolts. Although there are no bolt columns pressing on the other two sides, due to the high stiffness of the metal upper cover, the downward pressure of the upper cover is approximately parallel downward for the entire surface, which can make the sealing rings on the four sides reach the ideal compression rate to achieve the IPX7 sealing effect. The fasteners can be fixed bolts, studs, screws, etc. The bottom cylinder has only wall thickness in the thickness direction of the battery cell, which is beneficial to increasing the thickness dimension of the battery cell and realizing the effective expansion of the battery pack. In addition, the battery pack adopts the design of combining fasteners and sealing rings, which is convenient for unpacking the battery pack and can effectively reduce the repair cost.

[0013] Specifically, the fasteners penetrate through the upper and lower surfaces of the upper cover. There are at least four fasteners, which are located at the edge of the upper cover. The sealing ring is fixed in the sealing ring fixing groove, and the sealing ring fixing groove is arranged at the bottom of the upper cover and surrounds the opening of the upper cover. Using a sealing ring for sealing, with fasteners only arranged on the upper and lower surfaces of the upper cover, the entire sealing ring is compressed under the drive of the screws, and a good sealing effect can be achieved. Since the fasteners penetrate through the upper and lower surfaces of the upper cover, and the left and right surfaces of the bottom cylinder have only wall thickness, the space in the thickness direction of the battery can be fully utilized to increase the thickness dimension of the battery cell to improve the battery capacity and space utilization rate.

[0014] A protection board is provided between the bottom cylinder and the upper cover, and a wire harness set is provided between the protection board and the adapter board. The wire harness set is arranged below the protection board, which is convenient for arranging the wire harness when pre-installing the upper cover. When assembling, the wire harness between the upper cover and the bottom cylinder is connected and the fasteners are fixed to complete the battery pack assembly. The overall package design is simple, the wiring is regular, the operation is convenient, and it is suitable for batch production.

[0015] A charge and discharge socket is provided on the outer side of the upper cover. The wire harness set below the protection board is led out through the charge and discharge socket. The charge and discharge socket is provided on the upper cover instead of the bottom cylinder, so that the thickness of the bottom cylinder is only the thickness of the wall, the module bracket and the battery cell, and the thickness dimension of the battery cell is increased to improve the battery capacity.

[0016] A first handle mounting hole is provided on the side of the upper cover, and a second handle mounting hole is provided on the side of the bottom cylinder. The first handle mounting hole is used to mount the first handle, and the second handle mounting hole is used to mount the second handle. There are handle mounting holes on both the bottom cylinder and the upper cover. The first handle and the second handle can be the same handle, and different positions can be selected and installed based on needs to achieve the compatibility of the battery pack with different vehicle models.

[0017] The beneficial effects of the present invention are as follows: The battery pack uses a temperature equalizing film and a heat dissipation film for thermal management, has a good temperature equalizing effect and heat dissipation effect, occupies a small space, has a low cost, solves the problem that it is difficult to balance battery thermal management and battery capacity expansion, and realizes the improvement of the comprehensive performance of the battery pack and the increase of the service life; The bottom cylinder and the upper cover are made of metal materials, and a design combining fasteners and sealing rings is adopted. The bottom cylinder has only the wall thickness in the thickness direction of the battery cell, which can improve the space utilization rate and realize the effective expansion of the battery pack; The handle of the battery pack can be selected and installed at different positions based on needs to achieve the compatibility of the battery pack with different vehicle models; The battery pack has a rainproof and shock-absorbing design and is suitable for the field of electric two-wheel vehicles. Description of the Drawings

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can be obtained by extending according to the provided drawings without creative efforts.

[0019] Figure 1 It is a schematic diagram of the internal structure of the battery pack in Embodiment 1.

[0020] Figure 2 It is a schematic diagram of the battery pack housing in Embodiment 1.

[0021] Figure 3 It is a layout diagram of the battery cells and the adapter board of the battery pack module.

[0022] Figure 4 It is a layout diagram of the temperature equalizing film of the battery pack module.

[0023] Figure 5 It is an assembly diagram of the module and the metal bottom cylinder in Embodiment 1.

[0024] Figure 6 It is a layout diagram of the heat dissipation film.

[0025] Figure 7 Schematic diagram of the metal upper cover housing in Embodiment 1.

[0026] Figure 8 Schematic diagram of the internal structure of the metal upper cover in Embodiment 1.

[0027] Description of reference numerals: 1 - bottom cylinder; 2 - module bracket; 3 - battery cell; 4 - wire harness set; 5 - protection board; 6 - upper cover; 61 - fastener; 62 - sealing ring; 7 - first handle; 8 - charge and discharge socket; 9 - temperature equalizing film; 10 - adapter board; 11 - heat dissipation film; 12 - second handle. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] First, the concepts involved in the present application will be described in conjunction with the accompanying drawings. It should be noted here that the following descriptions of each concept are only for making the content of the present application easier to understand, and do not represent a limitation on the protection scope of the present application; at the same time, without conflict, the embodiments and the features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0030] Embodiment 1 A design of an electric bicycle battery pack with thermal management, large capacity and multi - purpose, including a bottom cylinder 1, an upper cover 6 and internal modules. The modules include a module bracket 2 and battery cells 3. The battery cells 3 are connected to a transfer board 10 through battery cell tabs. A temperature - equalizing film 9 is attached to the top of the battery cell tabs. Based on the module arrangement, the heat dissipation of the peripheral battery cells of the electric bicycle battery pack is better than that of the internal battery cells. Uneven internal and external heat dissipation will cause a large temperature difference between the battery cells, exacerbating the attenuation of battery life. In the present invention, the battery cell tabs are connected in series with the transfer board 10 by laser welding to achieve internal electrical connection within the module. The battery cell tabs can be copper foil or aluminum foil, connecting the inside of the battery cells 3. Bonding two highly thermally conductive temperature - equalizing films 9 at the upper end of the transfer board 10 can effectively reduce the temperature difference between each battery cell within the module, achieving a good temperature - equalizing effect. The temperature - equalizing film 9 is bonded to the top of the battery cell tabs to achieve heat dissipation from the tabs, optimizing the heat dissipation path of the battery cells 3, thereby improving the comprehensive performance of the battery pack and increasing its service life. The temperature - equalizing film 9 can be a graphene heat - dissipation film. The graphene heat - dissipation film has a high thermal conductivity and its own thickness is only at the millimeter level, occupying a small size in the height direction inside the battery pack. Using a small - size structure can reduce the temperature difference between the battery cells to achieve uniform heat, which is beneficial to the expansion of the battery pack capacity. Preferably, the temperature - equalizing film 9 is a graphene composite film, which has high mechanical strength and good flexibility. In addition, since the temperature - equalizing film 9 is fixed above the transfer board 10 and the temperature - equalizing film 9 and the transfer board 10 wrap the battery cell tabs, even if water enters the outer layer, the inner layer still has a protective effect, preventing rainwater from corroding the circuit.

[0031] The inner side of the bottom cylinder 1 is bonded to the upper side of the temperature - equalizing film 9 through a heat - dissipation film 11. The heat - dissipation film 11 is foldable and has partial double - sided adhesive. After assembly, the folding angle of the heat - dissipation film 11 is 85° - 95°. The heat - dissipation film 11 has partial double - sided adhesive. One end of the heat - dissipation film 11 is bonded to the inner side of the bottom cylinder 1. After the module is installed in the bottom cylinder 1, the other end of the heat - dissipation film 11 is bonded to the upper side of the temperature - equalizing film 9. The addition of the heat - dissipation film 11 establishes a heat - exchange channel between the battery and the external environment, which can effectively reduce the temperature of the battery pack itself. Utilizing the high thermal conductivity of the heat - dissipation film 11 to achieve heat dissipation from the battery to the outer shell. After bonding, the folding angle of the heat - dissipation film 11 is 85° - 95°, realizing the optimization of the heat - conduction path and simplifying the spatial layout. The heat - dissipation film 11 bonded to the temperature - equalizing film 9 can improve the heat - dissipation efficiency, enabling uniform heat dissipation of the peripheral battery cells and internal battery cells, saving material costs while improving the heat - dissipation efficiency. Before installing the module, the heat - dissipation film 11 is first pasted on the inner side of the bottom cylinder 1. The heat - dissipation film 11 is foldable and has partial double - sided adhesive, facilitating the assembly and repair of the battery pack. There is a gap between the bottom cylinder 1 and the module, allowing a certain degree of volume expansion of the battery cells 3. The heat - dissipation film 11 pasted between the bottom cylinder 1 and the module can play a lateral fixing role for the module, reducing the displacement of the battery cells 3. At the same time, the heat - dissipation film 11 distributed on all four sides has good flexibility and can act as a buffer structure to disperse vibration energy, making the battery pack both lightweight and vibration - resistant, adapting to the high - frequency vibration of urban roads. Preferably, the heat - dissipation film 11 can be a graphene heat - dissipation film, which has a small thickness, high heat - dissipation efficiency and low cost.

[0032] Specifically, there are at least two heat dissipation films 11, which are arranged around the center of the bottom cylinder 1. There are at least two heat dissipation films 11, which are dispersedly arranged above the temperature equalizing film 9, which can save the amount of the heat dissipation film 11 and improve the heat dissipation efficiency. The present invention improves the heat dissipation efficiency at the tab by the heat dissipation film 11, conducts the heat of the battery cell to the external environment, avoids the decline of the battery's own performance caused by the accumulation of battery heat, and prevents thermal runaway. This design is simple to operate. Compared with liquid cooling, air cooling or phase change material cooling in the prior art, it occupies less space, has high heat dissipation efficiency, and low cost, which is beneficial to the expansion of the battery pack and is applicable to the field of electric two-wheel vehicles.

[0033] Both the bottom cylinder 1 and the upper cover 6 are made of metal materials. Adopting a metal cylindrical shell structure, it has high internal compressive strength, can effectively limit the disorderly expansion of the battery in the middle and later stages, and increase the cycle life of the battery cell; the metal shell has a high residual value in subsequent recycling, which can effectively reduce the full-life cycle use cost of the battery pack.

[0034] Among them, the bottom cylinder 1 and the upper cover 6 are connected by fasteners 61, and a sealing ring 62 is arranged below the upper cover 6. The two sides of the upper cover 6 compress the sealing ring 62 through bolts. Although there are no bolt columns pressing on the other two sides, due to the high stiffness of the metal upper cover 6, the downward pressure of the upper cover 6 is approximately parallel downward for the whole surface, so that the sealing rings 62 on the four sides can all reach the ideal compression rate to achieve the IPX7 sealing effect. Utilizing the characteristic of the high stiffness of the metal upper cover 6, the upper cover 6 presses down the sealing ring 62 as a whole, so that the IPX7 sealing effect can be achieved without screw columns in the large surface direction of the battery cell. The fasteners 61 can be fixing bolts, studs, screws, etc. The bottom cylinder 1 has only wall thickness in the thickness direction of the battery cell, which is beneficial to increasing the thickness dimension of the battery cell 3 and realizing the effective expansion of the battery pack. In addition, the battery pack adopts the design of combining fasteners 61 and sealing rings 62, which is convenient for unpacking the battery pack and can effectively reduce the repair cost.

[0035] Specifically, the fasteners 61 penetrate through the upper and lower surfaces of the upper cover 6. There are at least four fasteners 61, which are located at the edge of the upper cover 6. The sealing ring 62 is fixed in the sealing ring fixing groove, and the sealing ring fixing groove is arranged at the bottom of the upper cover 6 and surrounds the opening of the upper cover 6. Using the sealing ring 62 for sealing, only the fasteners 61 are arranged on the upper and lower surfaces of the upper cover 6. Under the drive of the screws, the whole sealing ring is compressed, and a good sealing effect can be achieved. Since the fasteners 61 penetrate through the upper and lower surfaces of the upper cover 6, and the left and right surfaces of the bottom cylinder 1 have only wall thickness, the space in the thickness direction of the battery can be fully utilized to increase the thickness dimension of the battery cell 3 to increase the battery capacity and improve the space utilization rate.

[0036] A protection plate 5 is provided between the bottom cylinder 1 and the upper cover 6, and a wire harness assembly 4 is provided between the protection plate 5 and the adapter plate 10. The wire harness assembly 4 is arranged below the protection plate 5, which is convenient for arranging the wire harness when pre-installing the upper cover 6. During assembly, the wire harness between the upper cover 6 and the bottom cylinder 1 is connected and the fastener 61 is fixed to complete the assembly of the battery pack. The overall package design is simple, the wiring is regular, the operation is convenient, and it is convenient for mass production.

[0037] A charge and discharge socket 8 is provided on the outer side of the upper cover 6. The wire harness assembly 4 below the protection plate 5 is led out through the charge and discharge socket 8. The charge and discharge socket 8 is arranged on the upper cover 6 instead of the bottom cylinder 1, so that the thickness of the bottom cylinder 1 is only the wall thickness, the thickness of the module bracket 2 and the battery cell 3, and the thickness dimension of the battery cell 3 is increased to improve the battery capacity.

[0038] A first handle mounting hole is provided on the side surface of the upper cover 6, and a second handle mounting hole is provided on the side surface of the bottom cylinder 1. The first handle mounting hole is used to mount the first handle 7, and the second handle mounting hole is used to mount the second handle 12. There are handle mounting holes on both the bottom cylinder 1 and the upper cover 6. The first handle 7 and the second handle 12 can be the same handle, and different positions can be selected and installed based on needs to achieve the compatibility of the battery pack with different vehicle models.

[0039] It should be noted that the terms used in this application are only for describing specific embodiments and do not limit the scope of this application. As shown in the specification of this application, unless the context clearly indicates an exceptional situation, words such as "a", "one", "a kind" and / or "the" are not specifically singular and may also include the plural. The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method or device including the said element.

[0040] It should also be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, terms such as "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0041] The above-described embodiments and / or implementation manners are only used to illustrate the preferred embodiments and / or implementation manners for implementing the technology of the present invention, and do not impose any formal restrictions on the implementation manners of the technology of the present invention. Any person skilled in the art, without departing from the scope of the technical means disclosed in the content of the present invention, may make some changes or modifications to other equivalent embodiments, but should still be regarded as the same technology or embodiment as the present invention in essence. Specific examples are used in this article to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. The above is only the preferred implementation manner of the present application. It should be noted that due to the limitation of literal expression and objectively infinite specific structures, for those of ordinary skill in the art, without departing from the principle of the present application, several improvements, refinements or changes can also be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or directly applying the concept and technical solution of the invention to other occasions without improvement, should all be regarded as the protection scope of the present application.

Claims

1. A design of a large-capacity, multi-purpose electric bicycle battery pack with thermal management, comprising a bottom barrel (1), an upper cover (6) and an internal module, characterized in that: The module comprises a module support (2) and a battery cell (3); the battery cell (3) is connected to a transfer plate (10) via a battery cell tab; a temperature-averaging film (9) is attached to the top of the battery cell tab.

2. The design of a large-capacity, multi-purpose electric bicycle battery pack with thermal management according to claim 1 is characterized by: The inner side of the bottom tube (1) is bonded to the top of the temperature-averaging film (9) via a heat dissipation film (11); the heat dissipation film (11) is foldable and has adhesive backing on both sides; after assembly, the folding angle of the heat dissipation film (11) is 85° to 95°.

3. The design of a large-capacity multi-purpose electric bicycle battery pack with thermal management according to claim 2 is characterized by: There are at least two heat dissipation films (11), which are arranged around the center of the bottom tube (1).

4. The design of a large-capacity, multi-purpose electric bicycle battery pack with thermal management according to claim 1 is characterized by: The bottom cylinder (1) and the upper cover (6) are both made of metal materials.

5. The design of a large-capacity multi-purpose electric bicycle battery pack with thermal management according to claim 4 is characterized by: The bottom cylinder (1) and the upper cover (6) are connected via a fastener (61), and a sealing ring (62) is provided below the upper cover (6).

6. The design of a large-capacity, multi-purpose electric bicycle battery pack with thermal management according to claim 5 is characterized by: The fasteners (61) penetrate the upper and lower surfaces of the upper cover (6), and there are at least four fasteners (61) located at the edge of the upper cover (6).

7. The design of a large-capacity, multi-purpose electric bicycle battery pack with thermal management according to claim 5 is characterized by: The sealing ring (62) is fixed in a sealing ring fixing groove, and the sealing ring fixing groove is arranged at the bottom of the upper cover (6) and surrounds the opening of the upper cover (6).

8. The design of a large-capacity, multi-purpose electric bicycle battery pack with thermal management according to claim 1 is characterized by: A protective plate (5) is provided between the bottom tube (1) and the upper cover (6), and a wiring harness set (4) is provided between the protective plate (5) and the adapter plate (10).

9. The design of a large-capacity, multi-purpose electric bicycle battery pack with thermal management according to claim 1 is characterized by: A charging and discharging socket (8) is provided on the outer side of the upper cover (6).

10. The design of a large-capacity, multi-purpose electric bicycle battery pack with thermal management according to claim 1, characterized in that: A first handle mounting hole is provided on the side of the upper cover (6), and a second handle mounting hole is provided on the side of the bottom tube (1).

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