Battery module and electric power-assisted bicycle

Abstract

The utility model provides a battery module and electric moped, the battery module is configured to be installed in the battery containing cavity of electric moped, the battery module comprises a plurality of battery cells, a tab plate and a battery management circuit board, each battery cell is columnar, the plurality of battery cells are linearly and sequentially arranged in a row along the length direction of the battery containing cavity, the tab plate is arranged on the battery management circuit board, and the battery management circuit board is arranged in the battery containing cavity. A linear battery pack is formed; the tab plate is strip-shaped, is approximately parallel to the arrangement direction of the plurality of battery cells, is positioned on one side of the battery pack, and is provided with a plurality of positive electrode connecting parts and a plurality of negative electrode connecting parts; the number of the battery cells in the cross section of the battery module is one, the positive electrode and the negative electrode of each battery cell are electrically connected with the positive electrode connecting part and the negative electrode connecting part of the tab plate respectively, and the battery management circuit board collects parameters of the multiple battery cells through the tab plate. According to the battery module and the electric power-assisted bicycle, the battery module can adapt to the internal space of the frame of the electric power-assisted bicycle.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery module and an electric power-assisted bicycle. Background Art

[0002] With the advancement of science and technology and the continuous improvement of user requirements, electric-assisted bicycles, including battery modules, have emerged. Bicycle battery modules are typically installed in the bicycle's battery compartment. However, the battery modules in related art have an unreasonable structural design. When installed in the battery compartment, the battery module has difficulty fitting within the interior space of the electric-assisted bicycle frame. Utility Model Content

[0003] The utility model provides a battery module and an electric power-assisted bicycle, aiming to make the battery module adapt to the inner space of a frame of the electric power-assisted bicycle.

[0004] A first aspect of the present invention provides a battery module, wherein the battery module is configured to be installed in a battery receiving chamber of an electric-assisted bicycle, and the battery module comprises:

[0005] A plurality of battery cells, each of which is cylindrical, and the plurality of battery cells are arranged in a straight line along the length direction of the battery accommodating cavity to form a linear battery pack;

[0006] A tab plate, which is in the shape of an elongated strip and is arranged substantially parallel to the arrangement direction of the plurality of battery cells. The tab plate is located on one side of the battery pack and is provided with a plurality of positive electrode connecting portions and a plurality of negative electrode connecting portions; and

[0007] A battery management circuit board, electrically connected to the tab plate, for monitoring parameters of the plurality of battery cells, wherein the parameters include at least one of the following: voltage, current, charge, and temperature;

[0008] Among them, the number of the battery cells in the cross-section of the battery module is one, the cross-section is perpendicular to the length direction of the battery accommodating cavity, the positive pole and the negative pole of each battery cell are electrically connected to the positive pole connecting part and the negative pole connecting part of the pole lug plate respectively, and the battery management circuit board collects the parameters of the multiple battery cells through the pole lug plate.

[0009] A second aspect of the present invention provides a battery module, which is configured to be installed in a battery receiving chamber of an electric-assisted bicycle. The battery module includes:

[0010] One or more battery cells, each of which is cylindrical, and the one or more battery cells are arranged along the length direction of the battery accommodating cavity to form a battery pack;

[0011] When the battery module is installed in the battery accommodating cavity, the number of the battery cells in the cross section of the battery module is one, the cross section is perpendicular to the length direction of the battery accommodating cavity, and the outer surface of the battery module is close to the inner wall of the battery accommodating cavity.

[0012] A third aspect of the present invention provides an electric power-assisted bicycle, comprising:

[0013] A vehicle frame including a support tube having a battery receiving cavity; and

[0014] A battery module as described above.

[0015] Technical effect: The battery module and electric-assisted bicycle provided in the embodiments of the present application can save the gap between multiple battery cells when they are arranged in parallel, thereby miniaturizing the volume of the entire battery pack to facilitate adaptation to the internal space of the frame of the electric-assisted bicycle.

[0016] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory and cannot limit the disclosure of the embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of a battery module provided by one embodiment of the present invention when installed in a battery receiving cavity;

[0019] Figure 2 This is a schematic structural diagram of an electric power-assisted bicycle provided by an embodiment of the present utility model;

[0020] Figure 3 This is a schematic structural diagram of a battery module provided by one embodiment of the present utility model;

[0021] Figure 4 This is a schematic structural diagram of a battery module provided by one embodiment of the present utility model;

[0022] Figure 5 This is a structural diagram of a battery module provided by one embodiment of the present utility model;

[0023] Figure 6 This is a partially exploded schematic diagram of a battery module provided by one embodiment of the present utility model;

[0024] Figure 7 This is a partial structural diagram of a battery module provided by an embodiment of the present utility model;

[0025] Figure 8 This is a partial cross-sectional view of a battery cell provided by one embodiment of the present utility model.

[0026] Description of reference numerals:

[0027] 1000. Electric-assisted bicycles;

[0028] 100. Battery module; 101. Battery pack;

[0029] 10. Battery cell; 11. Housing; 12. Battery cell body; 13. Current cut-off valve; 131. Pressure relief hole;

[0030] 20. Lug plate; 21. Positive electrode connection portion; 22. Negative electrode connection portion;

[0031] 30. Battery management circuit board; 40. Battery cell bracket;

[0032] 50. Housing; 51. Glue filling hole; 52. Observation hole; 53. Air vent; 60. Thermal conductive structure; 61. Thermal conductive adhesive;

[0033] 70. Conductive component; 71. Conductive metal sheet; 71a. First conductive metal sheet; 71b. Second conductive metal sheet; 72. Main body; 73. First arm; 74. Second arm; 75. First extension; 76. Second extension; 77. First conductive elastic member; 78. Second conductive elastic member;

[0034] 91. Analog signal acquisition circuit board; 92. Electrical connection interface; 93. Temperature sensor;

[0035] 200, battery accommodating cavity; 300, frame; 301, support tube; 302, down tube; 303, seat tube. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0038] It should also be understood that the terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in this specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0039] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0040] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0041] See also Figure 1 and Figure 2 The embodiment of the present invention provides a battery module 100, which is configured to be installed in the battery receiving chamber 200 of the electric-assisted bicycle 1000. When the electric-assisted bicycle 1000 requires power, the battery module 100 can power the drive device (not shown) of the electric-assisted bicycle 1000 to assist the electric-assisted bicycle 1000 in moving forward. When the electric-assisted bicycle 1000 does not require power, such as when the electric-assisted bicycle 1000 is going downhill or when the user applies pedaling force to drive the electric-assisted bicycle 1000, the electrical connection between the battery module 100 and the drive device of the electric-assisted bicycle 1000 can be disconnected.

[0042] See also Figure 1 and Figure 2In some embodiments, the electric assisted bicycle 1000 includes a frame 300 , the frame 300 is provided with a battery receiving cavity 200 , and the battery module 100 is installed in the battery receiving cavity 200 .

[0043] The battery receiving chamber 200 can be located at any suitable position on the vehicle frame 300. Figure 1 and Figure 2 In some embodiments, the frame 300 includes a support tube 301, which is provided with a battery receiving cavity 200. The support tube 301 can be any suitable tubular structure of the frame 300, for example, the support tube 301 includes at least one of the following: the down tube 302, the seat tube 303, the top tube, or other tubes of the electric-assisted bicycle 1000. In this way, at least a portion of the battery module 100 can be installed within the existing support tube 301 of the electric-assisted bicycle 1000, fully utilizing the space in the support tube 301, minimizing the amount of storage space occupied by the battery module 1000, and minimizing the likelihood of the electric-assisted bicycle 1000 increasing in size due to the installation of the battery module 100. The battery receiving cavity 200 is provided within the existing support tube 301 of the electric-assisted bicycle 1000, which has little impact on the overall appearance of the electric-assisted bicycle 1000 and helps improve the aesthetics of the entire vehicle.

[0044] Understandably, Figure 1 and Figure 2 The structure and / or shape of the power-assisted bicycle 1000 and its components are merely exemplary and may be modified according to actual needs without being limited thereby.

[0045] Currently, the battery module 100 of the electric assisted bicycle 1000 is usually placed in the support tube 301 (such as the down tube 302 or other tube) of the electric assisted bicycle 1000. However, since there is no corresponding battery module 100 design on the market, multiple cylindrical battery cells are bundled together to form a battery module, and the envelope of the battery module is often polygonal or square, resulting in partial waste of space in the support tube 301, which will also cause the energy storage capacity of the electric assisted bicycle 1000 to decrease.

[0046] See also Figure 3In some embodiments, the battery module 100 includes a battery cell 10, a tab plate 20, and a battery management circuit board 30. There are multiple battery cells 10, each of which is cylindrical. The multiple battery cells 10 are arranged in a straight line along the length of the battery compartment 200 to form a linear battery pack 101. The tab plate 20 is elongated and arranged generally parallel to the arrangement of the multiple battery cells 10. The tab plate 20 is located on one side of the battery pack 101 and is provided with multiple positive electrode connectors 21 and multiple negative electrode connectors 22. The battery management circuit board 30 is electrically connected to the tab plate 20 and is used to monitor parameters of the multiple battery cells 10, including at least one of the following: voltage, current, charge, temperature, etc. Among them, the number of battery cells 10 in the cross section of the battery module 100 is one, and the cross section is perpendicular to the length direction of the battery accommodating cavity 200. The positive pole and the negative pole of each battery cell 10 are respectively electrically connected to the positive pole connection part 21 and the negative pole connection part 22 of the pole lug plate 20, and the battery management circuit board 30 collects the parameters of multiple battery cells 10 through the pole lug plate 20.

[0047] In the battery module 100 of the above embodiment, multiple columnar battery cells 10 are arranged along the length direction to form a linear battery pack 101, which saves the gap between the battery cells 10 when the multiple battery cells 10 are arranged side by side, thereby miniaturizing the volume of the entire battery pack 101 to adapt to the internal space of the frame 300 of the electric-assisted bicycle 1000; when the space of the battery accommodating cavity 200 is certain, the cross-sectional size of the battery cell 10 can be designed to be larger, and / or the number of battery cells 10 can be designed to be more, so that the energy density of the battery pack 101 is designed to be larger, the capacity of the battery pack 101 is designed to be larger, and the energy storage capacity of the battery module 100 is improved. In addition, the battery management circuit board 30 collects the parameters of each battery cell 10 through the long pole lug plate 20, that is, it is electrically connected to the battery management circuit board 30 by sharing the pole lug plate 20, and there is no need to set up multiple wires for each battery cell 10 to be electrically connected to the battery management circuit board 30, thereby avoiding the formation of a large wire bundle, further compressing the space occupied by the battery module 100, and also preventing the terminal blocks of one or more wires in the wire bundle from loosening easily in a vibration environment (such as during the riding of an electric power-assisted bicycle).

[0048] For example, the length direction of the battery receiving chamber 200 is parallel to Figure 3 The arrangement direction of the plurality of battery cells 10 is parallel to the X direction. Figure 3 The X direction in .

[0049] See also Figure 3In some embodiments, the battery module 100 includes one or more battery cells 10, each of which is cylindrical. The one or more battery cells 10 are arranged along the length of the battery accommodating cavity 200 to form a battery pack 101. When the battery module 100 is installed in the battery accommodating cavity 200, the number of battery cells 10 within the cross-section of the battery module 100 is one, the cross-section is perpendicular to the length of the battery accommodating cavity 200, and the outer surface of the battery module 100 is close to the inner wall of the battery accommodating cavity 200.

[0050] The number of battery cells 10 in the cross section of the battery module 100 of the above embodiment is one, and the cross section is perpendicular to the length direction of the battery accommodating cavity 200. Compared with the number of battery cells 10 in the cross section of the battery module 100 being at least two, the number of battery cells 10 in the cross section of the battery module 100 of this embodiment is one, so that the gap between the side-by-side battery cells 10 when at least two battery cells 10 are arranged in parallel can be saved, thereby miniaturizing the volume of the entire battery pack 101 and facilitating adaptation to the internal space of the frame 300 of the electric assisted bicycle 1000; when the space of the battery accommodating cavity 200 is fixed, the size of the cross section of the battery cell 10 can be designed to be larger, and / or the number of battery cells 10 can be designed to be more, so that the energy density of the battery pack 101 is designed to be larger, the capacity of the battery pack 101 is designed to be larger, and the energy storage capacity of the battery module 100 is improved.

[0051] Since the outer surface of the battery module 100 is close to the inner wall of the battery accommodating cavity 200, when the battery module 100 is installed in the battery accommodating cavity 200, there is no or only a small remaining space in the battery accommodating cavity 200, and the space inside the battery accommodating cavity 200 can be fully utilized. When the space in the battery accommodating cavity 200 is fixed, the cross-sectional size of the battery cell 10 can be designed to be as large as possible, and / or the number of battery cells 10 can be designed to be as large as possible, thereby increasing the capacity of the battery module 100 as much as possible and improving the energy storage capacity of the battery module 100.

[0052] The shape of the battery pack 101 can be any suitable shape, such as linear, non-linear, etc.

[0053] See also Figure 1 and Figure 3In some embodiments, the cross-sectional shape of the battery module 100 is adapted to the shape formed by the inner wall of the battery accommodating cavity 200, so that the outer surface of the battery module 100 is closer to the inner wall of the battery accommodating cavity 200. As a result, when the battery module 100 is installed in the battery accommodating cavity 200, there is no or only a small amount of residual space in the battery accommodating cavity 200. For example, the envelope shape of the battery module 100 is substantially consistent with that of the battery accommodating cavity 200; and / or the envelope shape of the battery pack 101 or the battery cell 10 is substantially consistent with that of the battery accommodating cavity 200, so that when the battery module 100 is installed in the battery accommodating cavity 200, there is no or only a small amount of residual space in the battery accommodating cavity 200.

[0054] In some embodiments, the difference between the cross-sectional area of the battery module 100 and the cross-sectional area of the battery accommodating cavity 200 is less than a preset area threshold, so that the outer surface of the battery module 100 is closer to the inner wall of the battery accommodating cavity 200, so that when the battery module 100 is installed in the battery accommodating cavity 200, there is no or only a small residual space in the battery accommodating cavity 200. Exemplarily, the difference between the cross-sectional area of the battery module 100 and the cross-sectional area of the battery accommodating cavity 200 is small, for example, the difference between the cross-sectional area of the battery module 100 and the cross-sectional area of the battery accommodating cavity 200 is less than or equal to a first preset area threshold, so that when the battery module 100 is installed in the battery accommodating cavity 200, there is no or only a small residual space in the battery accommodating cavity 200. Exemplarily, the cross-sectional area of the battery cell 10 is slightly different from the cross-sectional area of the battery accommodating cavity 200. For example, the difference between the cross-sectional area of the battery cell 10 and the cross-sectional area of the battery accommodating cavity 200 is less than or equal to a second preset area threshold, so that when the battery module 100 is installed in the battery accommodating cavity 200, there is no or only a small remaining space in the battery accommodating cavity 200.

[0055] In some embodiments, the difference between the length of the battery module 100 and the length of the battery accommodating cavity 200 is less than a preset length threshold, so that the outer surface of the battery module 100 is closer to the inner wall of the battery accommodating cavity 200, so that when the battery module 100 is installed in the battery accommodating cavity 200, there is no or only a small residual space in the battery accommodating cavity 200. Exemplarily, the difference between the length of the battery module 100 and the length of the battery accommodating cavity 200 is small, for example, the difference between the length of the battery module 100 and the length of the battery accommodating cavity 200 is less than or equal to the preset length threshold, so that when the battery module 100 is installed in the battery accommodating cavity 200, there is no or only a small residual space in the battery accommodating cavity 200.

[0056] It is understandable that the thickness of the support tubes 301 or battery cavities 200 may vary between different vehicle models. Different specifications of battery cells 10 or battery modules 100 may be selected for support tubes 301 or battery cavities 200 of varying thicknesses. Specifically, the structure and / or shape of the corresponding battery cells 10 or battery modules 100 may be designed based on the size, shape, and length of the support tubes 301 or battery cavities 200. For example, the cross-section of the battery pack 101 or battery cell 10 may be elliptical or circular so that the maximum cross-sectional dimension of the battery pack 101 or battery cell 10 matches the diameter of the battery cavities 200. That is, the larger the diameter of the battery cavities 200, the larger the diameter of the battery pack 101 or battery cell 10 that can be selected. For another example, when the length of the battery accommodating cavity 200 is approximately 570 mm, the cross-sectional dimension of the battery cell 10 is in the range of 40 mm to 60 mm, such as 40 mm, 50 mm, 60 mm, or any other suitable value between 40 mm and 60 mm; the length of the battery cell 10 is in the range of 43 mm to 50 mm, such as 43 mm, 45 mm, 50 mm, or any other suitable value between 43 mm and 50 mm. The cross-sectional dimension of the battery module 100 is in the range of 45 mm to 65 mm, such as 45 mm, 50 mm, 65 mm, or any other suitable value between 45 mm and 65 mm.

[0057] For example, the number of battery cells 10 can be designed according to actual needs, such as one, two, three, four, five or more.

[0058] The battery cell 10 is cylindrical, meaning that it is cylindrical within the allowable range of machining tolerances. The battery cell 10 may be cylindrical, elliptical, or any other suitable cylindrical shape. For example, the cylindrical or elliptical shape of the battery cell 10 allows the shape of the battery module 100 to better match the battery compartment 200 of the frame 300 of the electric-assisted bicycle 1000, resulting in a more coordinated overall appearance of the electric-assisted bicycle 1000 and reducing the machining requirements for the frame 300.

[0059] In some embodiments, there is only one battery cell 10, and the line connecting the positive and negative electrodes of the battery cell 10 is substantially parallel to the length of the battery housing cavity 200. This, given a given capacity of the battery cell 10, can help reduce the cross-sectional area of the single battery cell 10, thereby reducing the cross-sectional area of the battery module 100. Given a given space in the battery housing cavity 200, the cross-sectional area of the battery cell 10 and the battery module 100 can be increased, thereby increasing the capacity of the battery module 100 and improving the energy storage capacity of the battery module 100. It will be understood that A and B being substantially parallel may include: the angle between A and B being less than or equal to 15 degrees.

[0060] See also Figure 3In some embodiments, there are multiple battery cells 10, and the positive electrode of one of two adjacent battery cells 10 is electrically connected to the negative electrode of the other battery cell 10. The multiple battery cells 10 can increase the capacity of the battery module 100 and improve the energy storage capacity of the battery module 100.

[0061] In some embodiments, the arrangement direction of the positive and negative electrodes of the battery cells 10 is aligned with the length direction of the battery cavity 200. This facilitates reducing the cross-sectional area of a single battery cell 10, thereby reducing the cross-sectional area of the battery module 100, while maintaining a constant capacity of the battery cavity 200. Furthermore, the cross-sectional area of the battery module 100 can be increased, thereby increasing the capacity of the battery cells 10 and the battery module 100, and improving the energy storage capacity of the battery module 100. For example, there are multiple battery cells 10, and the arrangement direction of the positive and negative electrodes of the battery cells 10 is aligned with the length direction of the battery cavity 200. It is understood that the alignment of C and D includes at least one of the following situations: C and D are completely aligned; or the difference between C and D is within a preset threshold range.

[0062] See also Figure 3 and Figure 4 In some embodiments, the battery module 100 further includes a cell holder 40 and a housing 50. The battery cell 10 is disposed in the cell holder 40, which is disposed within the housing 50. The cell holder 40 can support the battery cell 10, and the housing 50 helps protect the components within the housing 50 and enables the battery module 100 to be modularized for easy installation, carrying, or transportation.

[0063] See also Figure 4 In some embodiments, the battery module 100 further includes a heat-conducting structure 60, which is provided between the outer shell 50 and the battery cell 10, and the battery cell 10 is connected to the outer shell 50 through the heat-conducting structure 60. Exemplarily, the battery cell 10 is heat-conductingly connected to the outer shell 50 through the heat-conducting structure 60, and the heat at the battery cell 10 can be transferred to the heat-conducting structure 60, and the heat at the heat-conducting structure 60 can be transferred to the outer shell 50, thereby dissipating the heat at the battery cell 10 in a timely manner, preventing the battery cell 10 from failing due to excessive heat in the battery cell 10. Exemplarily, the heat-conducting structure 60 is fixedly connected to the battery cell 10, and the heat-conducting structure 60 is fixedly connected to the outer shell 50, so that the heat-conducting structure 60 can not only play a heat-conducting effect, but also strengthen the fixation of the battery cell 10, thereby improving the reliability of the battery module 100 and preventing the battery cell 10 from loosening or misalignment and causing poor contact.

[0064] The heat-conducting structure 60 may be any one of the following: heat-conducting adhesive 61 , heat-conducting metal structure, other heat-conducting structures, etc.

[0065] See also Figure 4 and Figure 5 In some embodiments, the heat-conducting structure 60 includes thermally conductive adhesive 61. The housing 50 is provided with multiple adhesive injection holes 51 and multiple observation holes 52, with at least one observation hole 52 located between two adjacent adhesive injection holes 51. The adhesive injection holes 51 are used to supply the thermally conductive adhesive 61, and the observation holes 52 are used to facilitate observation of the adhesive injection status within the housing 50. This configuration allows for more comprehensive observation of the adhesive injection status at different locations within the housing 50, which helps prevent over- or under-injection of adhesive. The number of adhesive injection holes 51 and / or observation holes 52 can be designed according to actual needs, such as one, two, three, four, or more.

[0066] See also Figure 6 In some embodiments, the battery module 100 further includes a plurality of conductive components 70 , through which two adjacent battery cells 10 are electrically connected to each other, thereby achieving a series connection of the two adjacent battery cells 10 . The series connection of the two adjacent battery cells 10 achieved through the conductive components 70 reduces the contact resistance between the two battery cells 10 , thereby reducing energy loss in the battery module 100 .

[0067] The conductive component 70 is conductive and may include at least one of the following: a conductive metal sheet 71, a conductive spring, a conductive column, or any other suitable conductive component. Figure 6 In some embodiments, the conductive component 70 includes a conductive metal sheet 71, and two adjacent battery cells 10 are electrically connected to the conductive metal sheet 71. This simplifies the structure of the conductive component 70 and eliminates the need for welding when electrically connecting two adjacent battery cells 10. This makes assembly of the battery module 100 simple, convenient, and rapid. Furthermore, the inclusion of the conductive metal sheet 71 in the conductive component 70 facilitates surface contact, reducing contact resistance when two battery cells 10 are connected in series, thereby reducing energy loss in the battery module 100.

[0068] See also Figure 6 In some embodiments, the conductive component 70 includes a main body 72, a first arm 73, a second arm 74, a first extension 75, and a second extension 76. The first arm 73 is electrically connected to one of two adjacent battery cells 10; the second arm 74 is electrically connected to the other of the two adjacent battery cells 10; the first extension 75 is connected to the main body 72; the second extension 76 is connected to the main body 72, and the second extension 76 is connected to the first extension 75. The two adjacent battery cells 10 are electrically connected via the first extension 75 and the second extension 76. This structure is beneficial for reducing the contact resistance between two adjacent battery cells 10, reducing the capacity loss of the battery module 100, and is beneficial for carrying a larger current, thereby allowing a larger current output and / or input, which can improve the power of the electric-assisted bicycle 1000 and provide stronger power.

[0069] See also Figure 6 For example, the conductive component 70 includes a first conductive metal sheet 71a and a second conductive metal sheet 71b. The first conductive metal sheet 71a includes a main body 72, a first branch arm 73, and a first extension 75, and the first extension 75 is connected to the main body 72 of the first conductive metal sheet 71a. The second conductive metal sheet 71b includes a main body 72, a second branch arm 74, and a second extension 76, and the second extension 76 is connected to the main body 72 of the second conductive metal sheet 71b. In other embodiments, the conductive component 70 may also be limited to Figure 6 For example, the conductive component 70 includes a conductive metal sheet 71, and the main body 72 of the conductive metal sheet 71 is not arc-shaped.

[0070] The number of first arms 73 can be designed based on actual needs, for example, the number of first arms 73 can be one, two, three, four, or more. The first arm 73 can be located at any suitable position on the main body 72. For example, the main body 72 is arc-shaped, with the first arm 73 located at at least one end. For example, having a first arm 73 at both ends of the main body 72 can increase the contact area between the conductive component 70 and the battery cell 10, reduce capacity loss in the battery module 100, and allow for greater current output and / or input, thereby increasing the power of the electric-assisted bicycle 1000 and providing greater traction. For another example, having at least two first arms 73 located at one end of the main body 72, with multiple first arms 73 spaced apart, can increase the contact area between the conductive component 70 and the battery cell 10. The gaps between adjacent first arms 73 can save material and reduce weight.

[0071] The structure, shape and / or number of the first extension portion 75 and / or the second extension portion 76 can be designed according to actual needs and are not limited here. The first extension portion 75 is adapted to the second extension portion 76 to better connect the first extension portion 75 and the second extension portion 76.

[0072] The main body 72 can have any suitable shape, such as a disc-shaped sheet, an arc-shaped sheet, or other regular or irregular shapes. Exemplarily, the main body 72 is arc-shaped, which can save material and reduce weight. Exemplarily, the main body 72 is arc-shaped, and the diameter of the arc can be appropriately designed to be larger, so that the conductive metal sheet 71 can withstand a larger current. This allows the battery module 100 to allow for a larger current output and / or input, thereby increasing the power of the electric-assisted bicycle 1000 and providing stronger driving force.

[0073] Exemplarily, the first arm 73 and / or the second arm 74 are provided with multiple welding points, which are conducive to carrying larger currents, allowing larger current output and / or input, and are conducive to improving the power of the electric-assisted bicycle 1000 and providing stronger power.

[0074] See also Figure 7 In some embodiments, the conductive component 70 includes a first conductive elastic member 77 . The first conductive elastic member 77 abuts between two adjacent battery cells 10 . This ensures reliable electrical connection between the two adjacent battery cells 10 , even if there are certain installation tolerances or errors between the two adjacent battery cells 10 . The first conductive elastic member 77 can include at least one of the following: a conductive spring, a conductive spring, or any other suitable conductive elastic member.

[0075] See also Figure 7 In some embodiments, the conductive component 70 further includes a second conductive elastic member 78 , which abuts the side of the battery cell 10 to collect parameters of the battery cell 10 through the second conductive elastic member 78 . The contact between the second conductive elastic member 78 and the side of the battery cell 10 can further reduce the lengthwise dimension of the battery module 100 . For example, the second conductive elastic member 78 is conductive and elastic, enabling the second conductive elastic member 78 to reliably abut the battery cell 10 . Even with certain installation tolerances or errors, the second conductive elastic member 78 can still reliably electrically connect to the battery cell 10 , thereby ensuring reliable collection of parameters of the battery cell 10 .

[0076] See also Figure 3 and Figure 6 In some embodiments, the battery module 100 further includes a tab plate 20. The tab plate 20 is elongated and disposed approximately parallel to the arrangement direction of the multiple battery cells 10. The tab plate 20 is located on one side of the multiple battery cells 10. Multiple conductive components 70 are fixedly connected to the tab plate 20 and electrically connected to the tab plate 20, so that parameters of each battery cell 10 can be collected through the tab plate 20 and the multiple conductive components 70. In this way, the parameters of each battery cell 10 can be collected by sharing the tab plate 20, eliminating the need to provide multiple wires for each battery cell 10. This avoids the formation of a bulky wire bundle, further reducing the space occupied by the battery cells 10, and preventing the terminals of one or more wires in the wire bundle from loosening in a vibrating environment (such as during riding an electric power-assisted bicycle). In other embodiments, the structure, shape, and position of the tab plate 20 can also be any other suitable design, such as where the tab plate 20 is not parallel to the arrangement direction of the multiple battery cells 10.

[0077] Illustratively, the second conductive elastic member 78 abuts against a side surface of the battery cell 10 , the second conductive elastic member 78 abuts against or is disposed on the electrode tab plate 20 , and the battery cell 10 is electrically connected to the electrode tab plate 20 via the second conductive elastic member 78 .

[0078] See also Figure 6In some embodiments, the conductive component 70 includes a first conductive metal sheet 71a and a second conductive metal sheet 71b. The first conductive metal sheet 71a is electrically connected to the positive electrode of one of two adjacent battery cells 10, and the second conductive metal sheet 71b is electrically connected to the negative electrode of the other battery cell 10. Both the first conductive metal sheet 71a and the second conductive metal sheet 71b are electrically connected to the tab plate 20 to achieve a series connection of the two adjacent battery cells 10. The first conductive metal sheet 71a and the second conductive metal sheet 71b are electrically connected to the two adjacent battery cells 10, respectively, to facilitate assembly of the battery pack 101. Exemplarily, the first conductive metal sheet 71a is connected to the second conductive metal sheet 71b, the first conductive metal sheet 71a is electrically connected to the second conductive metal sheet 71b, and the first conductive metal sheet 71a and the second conductive metal sheet 71b are both electrically connected to the tab plate 20. This allows for both the series connection of two adjacent battery cells 10 and the acquisition of parameters of the two adjacent battery cells 10 via the first conductive metal sheet 71a, the second conductive metal sheet 71b, and the tab plate 20. This eliminates the need for a separate conductive structure to achieve the electrical connection between the tab plate 20 and the battery cells 10, simplifying the structure of the battery module 100 and further reducing the space occupied by the battery module 100. Exemplarily, the first extension 75 of the first conductive metal sheet 71a and the second extension 76 of the second conductive metal sheet 71b are both connected to the tab plate 20.

[0079] In some embodiments, the first conductive metal sheet 71a is welded to the positive electrode of one of two adjacent battery cells 10, the second conductive metal sheet 71b is welded to the negative electrode of the other battery cell 10, and the first conductive metal sheet 71a and the second conductive metal sheet 71b are welded to the tab plate 20. Achieving connection through welding can improve the reliability of the battery module 100 and prevent poor electrical contact of the battery module 100 in a vibrating environment (e.g., during riding an electric-assisted bicycle 1000).

[0080] See also Figure 3In some embodiments, the battery module 100 further includes a battery management circuit board 30, which is electrically connected to the tab plate 20. The battery management circuit board 30 is configured to monitor parameters of the battery cells 10, including at least one of the following: voltage, current, charge, and temperature. Exemplarily, the battery management circuit board 30 manages and / or maintains each battery cell 10, prevents overcharging and / or overdischarging of the battery module 100, extends the service life of the battery module 100, and monitors the parameters and / or status of the battery module 100. Exemplarily, the battery management circuit board 30 includes an AFE (analog sampling front end) acquisition circuit, a driver circuit, and a charge estimation and control circuit. The driver circuit is configured to control charging and / or discharging. The charge estimation and control circuit can estimate charge based on the collected parameter information of each battery cell 10, control the driver circuit to turn the battery module 100 on and off, and detect the status of the battery module 100 to implement abnormal protection for the battery module 100.

[0081] See also Figure 8 In some embodiments, the battery cell 10 includes a housing 11, a cell body 12, and a current cutoff valve 13. The cell body 12 is disposed within the housing 11. The current cutoff valve 13 is configured to electrically connect to the cell body 12 in a first state and to disconnect from the cell body 12 in a second state. The first state includes the battery module 100 being in a normal operating state, and the second state includes the battery module 100 being in an abnormal venting state. In the first state, the current cutoff valve 13 is electrically connected to the cell body 12, allowing the cell body 12 of the battery cell 10 to be electrically connected to another battery cell 10, thereby ensuring the normal operation of the battery module 100. When the current cut-off valve 13 is in the second state, the current cut-off valve 13 can disconnect the electrical connection with the battery cell body 12, preventing the current cut-off valve 13 from being electrically connected to the battery cell body 12 and continuously generating heat or gas, which causes the pressure in the shell 11 to increase. This is beneficial to reducing the probability of the battery module 100 exploding or failing in an abnormal exhaust state, and improving the safety of the battery module 100.

[0082] For example, in an abnormal exhaust state, the amount of gas generated by the cell body 12 is greater than or equal to a preset threshold, or the pressure within the housing 11 is greater than or equal to a preset pressure threshold. In a normal operating state, the amount of gas generated by the cell body 12 is less than a preset threshold, or the pressure within the housing 11 is less than a preset pressure threshold.

[0083] See also Figure 8In some embodiments, a battery module 100 includes a housing 50, with a battery cell 10 disposed within the housing 50. The housing 50 is provided with a vent 53, and the current cutoff valve 13 is provided with a pressure relief hole 131. When the battery module 100 is in a first state, the pressure relief hole 131 is closed. When the battery module 100 is in a second state, the pressure relief hole 131 is open, communicating with the vent 53. When the battery module 100 is in the second state, the pressure relief hole 131 is open, allowing gas within the housing 11 to be promptly discharged, preventing excessive pressure within the housing 11 from causing explosion or failure of the battery module 100, thereby effectively improving the safety of the battery module 100. The vent 53 may be the aforementioned observation hole 52 or the glue injection hole 51. The vent 53 may also be other than the observation hole 52 or the glue injection hole 51. For example, the observation hole 52 and the glue injection hole 51 may be omitted, and the housing 50 may be provided with the vent 53.

[0084] The pressure relief hole 131 can be constructed in any suitable shape. For example, a notch or cutout is formed in the current cutoff valve 13 to form the pressure relief hole 131. The notch or cutout (pressure relief hole 131) is designed to break due to deformation of the current cutoff valve 13 (e.g., upside-down inversion), thereby releasing pressure within the housing 11 (releasing internally generated gas). The current cutoff valve 13 is made of a flexible material that can deform due to abnormal internal pressure within the housing 11. For example, a current cutoff valve 13 made of aluminum or other relatively flexible materials is suitable.

[0085] In some embodiments, the battery management circuit board 30 is electrically connected to the lug plate 20 through a flexible printed circuit (FPC) to avoid the use of wiring harnesses, which is conducive to saving space and can further compress the space occupied by the battery module 100; it is conducive to setting a larger capacity battery module 100 when the space of the battery accommodating cavity 200 is constant; it can also prevent one or more terminals in the wiring harness from easily loosening in a vibration environment (such as during the riding of an electric power-assisted bicycle).

[0086] In some embodiments, the tab plate 20 is a flexible printed circuit board (FPC), and the tab plate 20 is positioned closely against the side of the battery cell 10. The tab plate 20 is a flexible printed circuit board, which facilitates its placement closely against the battery cell 10. Positioning the tab plate 20 closely against the side of the battery cell 10 helps save space, further reducing the space occupied by the battery module 100.

[0087] In some embodiments, the battery module 100 further includes an analog signal acquisition circuit board 91, through which the battery management circuit board 30 is electrically connected to the tab plate 20. The analog signal acquisition circuit board 91 can acquire parameters of each battery cell 10 via the tab plate 20 and transmit the acquired parameters to the battery management circuit board 30. In other embodiments, the analog signal acquisition circuit board 91 can also be integrated with the battery management circuit board 30 on a single circuit board.

[0088] See also Figure 3 In some embodiments, the analog signal acquisition circuit board 91 and the battery management circuit board 30 are stacked and positioned at one end of a battery pack 10 formed by a plurality of battery cells 10. The analog signal acquisition circuit board 91 and the battery management circuit board 30 are arranged along the arrangement direction of the plurality of battery cells 10. This can reduce the radial dimension or cross-sectional dimension of the battery module 100, facilitating placement within the frame 300 of the electric-assisted bicycle 1000.

[0089] See also Figure 3 For example, the battery module 100 further includes an electrical connection interface 92 , through which the battery module 100 is electrically connected to external components, thereby achieving charging and / or discharging.

[0090] The embodiment of the present invention adopts a customized battery cell 10 stacking scheme. A single battery cell 10 is cylindrical and has a size of 5048 (diameter 50mm, height 48mm). Ten battery cells 10 are designed in series. The shell 11 of the battery cell 10 is designed with a high-strength steel shell, with a diameter of 50mm and a height of 48mm. After adopting a high-energy-density electrochemical system, the energy density can reach more than 280Wh / kg. A current interrupt device (CID) design is introduced into the battery cell 10. The current interrupt device includes a current cut-off valve 13 and a pressure relief hole 131. When the internal pressure of the battery cell 10 is too high, the pressure relief hole 131 can be opened, and the current cut-off valve 13 cuts off the conduction current at the same time, which can effectively avoid the dangers of overcharging, short circuiting, overheating, etc. of the battery cell 10, and play a role in the safety protection of the battery cell 10. The battery cell 10 adopts full-electrode lug technology, which can reduce the equivalent resistance of the busbar, support large current charging and discharging, and can increase the power of the electric-assisted bicycle 1000 and provide stronger power. When a single battery cell 10 abnormally thermally runs away, the battery cell 10 generates a large amount of gas, the CID will flip over, and the gas will be discharged from the inside of the battery cell 10 to the outside. The battery module 100 reserves an exhaust channel, and other devices can be discharged to the outside through the exhaust channel to achieve the thermal runaway exhaust effect.

[0091] The battery pack 101 is stacked using a long cylindrical stacking scheme, with a single large cylindrical battery cell 10 as a single cross-section. The positive and negative electrodes of the battery cell 10 are respectively led out using convex spot welding of conductive metal sheets 71. The positive conductive metal sheets 71 (such as the above-mentioned first conductive metal sheet 71a) and the negative conductive metal sheets 71 (such as the above-mentioned second conductive metal sheet 71b) of two adjacent battery cells 10 are laser-welded with double-layer conductive metal sheets 71 on the electrode ear plate 20 on the side of the battery pack 101 to achieve series connection between the battery cells 10. The positive electrode of the battery module 100 is connected to the battery management circuit board 30 through the positive electrode lead of the top battery cell 10, and the negative electrode of the battery module 100 is connected to the battery management circuit board 30 through the negative electrode lead of the bottom battery cell 10.

[0092] In addition to the convex spot welding connection of the conductive metal sheet 71 in the above-mentioned module stacking scheme, the series connection between the battery cells 10 can also be achieved by using a metal spring contact method, similar to the dry cell flashlight solution. Multiple metal springs (corresponding to the above-mentioned first conductive elastic member 77) are added to the positive electrode of the next battery cell 10 by laser welding. The metal spring contacts the negative electrode of the previous battery cell 10, and the series connection between the two adjacent battery cells 10 can be achieved.

[0093] After adopting the flashlight-type stacking solution, the voltage of the battery cell 10 is not led out by the conductive metal sheet 71. Since the shell 50 of the battery cell 10 is the negative electrode of the battery cell 10, the voltage of the battery cell 10 can also be led out through the side. A second conductive elastic member 78 is added to the tab plate 20 to sample the voltage of the battery cell 10. In addition, the thermistor or temperature sensor 93 (see Figure 7 ) can also be attached to the tab plate 20 and measure the temperature of the battery cell 10 by closely contacting the surface of the battery cell 10.

[0094] The voltage sampling of the battery cells 10 is integrated on the tab plate 20. Bump solder pads connected in series between the battery cells 10 can lead to the voltage of each string of battery cells 10. The tab plate 20 is connected to the analog signal acquisition chip on the analog signal acquisition circuit board 91 via PCB routing and FPC. In some embodiments, the battery module 100 includes the tab plate 20, the analog signal acquisition circuit board 91, and the battery management circuit board 30. The tab plate 20 adopts an FPC design and is closely attached to the battery cells 10. The tab plate 20 is press-connected to the analog signal acquisition circuit board 91 via the FPC. The analog signal acquisition circuit board 91 mainly includes AFE voltage sampling, temperature sampling, current sampling, etc. The analog signal acquisition circuit board 91 is plugged into the battery management circuit board 30 using a connector pair. The battery management circuit board 30 includes circuits such as charging and discharging MOS and fuses.

[0095] For example, the battery cell 10 can be first fixed and supported by the battery cell holder 40 to form a long cylindrical battery pack 101, which is then inserted into the outer shell 50. Then, multiple glue injection holes 51 are opened in the outer shell 50, and glue is injected into the outer shell 50 through the glue injection holes 51. After the glue is cured, it can fix the battery cell 10. For example, the number of glue injection holes 51 is three, and the number of observation holes 52 is six.

[0096] The present invention further provides an electric-assisted bicycle 1000 , which includes a frame 300 and a battery module 100 . The frame 300 includes a support tube 301 having a battery receiving cavity 200 . The battery module 100 is disposed in the battery receiving cavity 200 .

[0097] It should be noted that the structure and principle of the electric-assisted bicycle 1000 or battery module 100 described in this embodiment are the same or similar to those of the electric-assisted bicycle 1000 or battery module 100 in all the aforementioned embodiments. Those skilled in the art can clearly know that one or more implementation methods of the aforementioned embodiments can be applied to the electric-assisted bicycle 1000 or battery module 100 in this embodiment, and this embodiment will not be described in detail here.

[0098] In the present invention, unless otherwise expressly specified or limited, the terms "installed", "connected", "connected", "mechanically coupled" and "coupled" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected. They can be mechanically connected or electrically connected. They can be directly connected or indirectly connected through an intermediate medium. They can be internal communication between two elements or an interactive relationship between two elements. The mechanical coupling or coupling of two components includes direct coupling and indirect coupling, for example, direct fixed connection, connection through a transmission mechanism, etc. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0099] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0100] The disclosure above provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described above. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but a person of ordinary skill in the art will recognize the application of other processes and / or the use of other materials.

[0101] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific method steps, features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific method steps, features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0102] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A battery module, characterized in that: The battery module is configured to be installed in a battery receiving chamber of an electric-assisted bicycle, and the battery module includes: A plurality of battery cells, each of which is cylindrical, and the plurality of battery cells are arranged in a straight line along the length direction of the battery accommodating cavity to form a linear battery pack; A tab plate, which is in the shape of an elongated strip and is arranged substantially parallel to the arrangement direction of the plurality of battery cells. The tab plate is located on one side of the battery pack and is provided with a plurality of positive electrode connecting portions and a plurality of negative electrode connecting portions; and A battery management circuit board, electrically connected to the tab plate, for monitoring parameters of the plurality of battery cells, wherein the parameters include at least one of the following: voltage, current, charge, and temperature; Among them, the number of the battery cells in the cross-section of the battery module is one, the cross-section is perpendicular to the length direction of the battery accommodating cavity, the positive pole and the negative pole of each battery cell are electrically connected to the positive pole connecting part and the negative pole connecting part of the pole lug plate respectively, and the battery management circuit board collects the parameters of the multiple battery cells through the pole lug plate.

2. A battery module, characterized in that: The battery module is configured to be installed in a battery receiving chamber of an electric-assisted bicycle, and the battery module includes: One or more battery cells, each of which is cylindrical, and the one or more battery cells are arranged along the length direction of the battery accommodating cavity to form a battery pack; When the battery module is installed in the battery accommodating cavity, the number of the battery cells in the cross section of the battery module is one, the cross section is perpendicular to the length direction of the battery accommodating cavity, and the outer surface of the battery module is close to the inner wall of the battery accommodating cavity.

3. The battery module according to claim 2, characterized in that: The number of the battery cell is one, and the connection line between the positive electrode and the negative electrode of the battery cell is substantially parallel to the length direction of the battery accommodating cavity.

4. The battery module according to claim 2, wherein: There are multiple battery cells, and the positive electrode of one of two adjacent battery cells is electrically connected to the negative electrode of the other battery cell; and / or the arrangement direction of the positive and negative electrodes of the battery cells is consistent with the length direction of the battery accommodating cavity.

5. The battery module according to claim 2, characterized in that: The shape of the cross section of the battery module is compatible with the shape formed by the inner wall of the battery accommodating cavity; and / or the difference between the area of the cross section of the battery module and the area of the cross section of the battery accommodating cavity is less than a preset area threshold; and / or the difference between the length of the battery module and the length of the battery accommodating cavity is less than a preset length threshold.

6. The battery module according to claim 2, characterized in that: The battery module further includes: A battery cell support, wherein the battery cell is arranged on the battery cell support; The battery cell support is arranged in the shell.

7. The battery module according to claim 6, characterized in that: The battery module further includes: The heat-conducting structure is provided between the shell and the battery core, and the battery core is connected to the shell through the heat-conducting structure.

8. The battery module according to claim 7, characterized in that: The heat-conducting structure includes thermally conductive glue, and the shell is provided with a plurality of glue injection holes and a plurality of observation holes, wherein at least one of the observation holes is located between two adjacent glue injection holes, the glue injection holes are used for inputting the thermally conductive glue, and the observation holes are used for facilitating observation of the glue injection condition in the shell.

9. The battery module according to claim 4, characterized in that: The battery module further includes a plurality of conductive components, and two adjacent battery cells are electrically connected via the conductive components to achieve series connection of the two adjacent battery cells.

10. The battery module according to claim 9, characterized in that: The conductive component includes a conductive metal sheet, and two adjacent battery cells are electrically connected to the conductive metal sheet.

11. The battery module according to claim 10, characterized in that: The conductive component includes: Body part; a first arm, the first arm being electrically connected to one of the two adjacent battery cells; a second branch arm, the second branch arm being electrically connected to the other of the two adjacent battery cells; a first extension portion connected to the main body portion; a second extension portion connected to the main body portion, and the second extension portion is connected to the first extension portion; Wherein, two adjacent battery cells are electrically connected through the first extending portion and the second extending portion.

12. The battery module according to claim 9, wherein: The conductive component includes a first conductive elastic member, and the first conductive elastic member is in contact between two adjacent battery cells.

13. The battery module according to claim 12, characterized in that: The conductive component further includes a second conductive elastic member, which is in contact with a side surface of the battery cell, so that parameters of the battery cell can be collected through the second conductive elastic member.

14. The battery module according to claim 9, characterized in that: The battery module further includes: The lug plate is in the shape of an elongated strip and is arranged roughly parallel to the arrangement direction of the multiple battery cells. The lug plate is located on one side of the multiple battery cells. The multiple conductive components are fixedly connected to the lug plate and electrically connected to the lug plate so as to collect parameters of each battery cell through the lug plate and the multiple conductive components.

15. The battery module according to claim 14, characterized in that: The conductive component includes a first conductive metal sheet and a second conductive metal sheet, the first conductive metal sheet is electrically connected to the positive electrode of one of the two adjacent battery cells, the second conductive metal sheet is electrically connected to the negative electrode of the other battery cell, and the first conductive metal sheet and the second conductive metal sheet are both electrically connected to the electrode lug plate to achieve a series connection of the two adjacent battery cells.

16. The battery module according to claim 15, characterized in that: The first conductive metal sheet is welded to the positive electrode of one of the two adjacent battery cells, the second conductive metal sheet is welded to the negative electrode of the other battery cell, and the first conductive metal sheet and the second conductive metal sheet are welded together to the electrode lug plate.

17. The battery module according to claim 14, wherein: The battery module further includes: A battery management circuit board is electrically connected to the tab plate and is used to monitor parameters of the battery cell, wherein the parameters include at least one of the following: voltage, current, charge, and temperature.

18. The battery module according to claim 1 or 4, characterized in that: The battery cell comprises: case; The battery cell body is arranged in the shell; a current cut-off valve configured such that in a first state the current cut-off valve can be electrically connected to the battery cell body, and in a second state the current cut-off valve can be electrically disconnected from the battery cell body; The first state includes the battery module being in a normal working state, and the second state includes the battery module being in an abnormal exhaust state.

19. The battery module according to claim 18, wherein: The battery module includes a shell, the battery cell is arranged in the shell, the shell is provided with an air outlet, and the current cut-off valve is provided with a pressure relief hole; when the battery module is in the first state, the pressure relief hole is in a closed state; when the battery module is in the second state, the pressure relief hole is in an open state, and the pressure relief hole is connected to the air outlet.

20. An electric power-assisted bicycle, characterized in that: include: A vehicle frame including a support tube having a battery receiving cavity; as well as The battery module according to any one of claims 1 to 19.

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