Battery module and electric power-assisted bicycle

Abstract

The present application provides a battery module and an electric power-assisted bicycle, the battery module being configured to be mounted in a battery accommodating cavity of the electric power-assisted bicycle, and the battery module comprising multiple battery cells, a tab plate, and a battery management circuit board; each battery cell is columnar, and the multiple battery cells are linearly arranged in a column in sequence along the length direction of the battery accommodating cavity, to form a linear battery pack; the tab plate is strip-shaped, the tab plate is arranged approximately parallel to the arrangement direction of the multiple battery cells, the tab plate is located on a side of the battery pack, and the tab plate is provided with multiple positive electrode connecting portions and multiple negative electrode connecting portions; there is one battery cell in the cross-section of the battery module, the positive electrode and the negative electrode of each battery cell are electrically connected to a positive electrode connecting portion and a negative electrode connecting portion of the tab plate, respectively, and the battery management circuit board collects parameters of the multiple battery cells by means of the tab plate. The described battery module and electric assisted bicycle can enable the battery module to adapt to an internal space of the frame of the electric assisted bicycle.

Description

Battery module and electrically assisted bicycle TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery module and an electrically assisted bicycle. BACKGROUND

[0002] With the development of science and technology and the continuous improvement of user requirements, electrically assisted bicycles including battery modules have emerged. The battery module of the bicycle is usually installed in the battery accommodating cavity of the bicycle. However, the battery module in the related art has an unreasonable structure design, and when the battery module is installed in the battery accommodating cavity, the battery module is difficult to adapt to the internal space of the frame of the electrically assisted bicycle. SUMMARY

[0003] The present application provides a battery module and an electrically assisted bicycle, which aims to make the battery module adapt to the internal space of the frame of the electrically assisted bicycle.

[0004] The first aspect of the present application provides a battery module configured to be installed in a battery accommodating cavity of an electrically assisted bicycle, the battery module comprising:

[0005] a plurality of battery cells, each of the battery cells being columnar, and the plurality of battery cells being arranged in a line along a length direction of the battery accommodating cavity to form a linear battery pack;

[0006] a tab plate in the shape of a long strip, the tab plate being arranged substantially parallel to the arrangement direction of the plurality of battery cells, and the tab plate being located at one side of the battery pack, the tab plate being provided with a plurality of positive electrode connection portions and a plurality of negative electrode connection portions; and

[0007] a battery management circuit board electrically connected with the tab plate, for monitoring parameters of the plurality of battery cells, the parameters including at least one of voltage, current, power, and temperature;

[0008] wherein the number of the battery cells in a cross section of the battery module is one, the cross section being perpendicular to the length direction of the battery accommodating cavity, the positive electrode and the negative electrode of each of the battery cells being electrically connected with the positive electrode connection portion and the negative electrode connection portion of the tab plate respectively, and the battery management circuit board collecting the parameters of the plurality of battery cells through the tab plate.

[0009] The second aspect of the present application provides a battery module configured to be installed in a battery accommodating cavity of an electrically assisted bicycle, the battery module comprising:

[0010] one or more battery cells, each of the battery cells being columnar, the one or more battery cells being arranged along a length direction of the battery accommodating cavity to form a battery pack;

[0011] wherein, when the battery module is installed in the battery accommodating cavity, the number of the battery cells in a 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] The third aspect of the present application provides an electrically assisted bicycle, comprising:

[0013] a frame comprising a support tube provided with a battery accommodating cavity; and

[0014] the battery module as described above.

[0015] Technical effects: the battery module and the electrically assisted bicycle provided by the embodiments of the present application can save the gap between the side-by-side battery cells when the plurality of battery cells are arranged side by side, thereby miniaturizing the volume of the entire battery pack, so as to adapt to the internal space of the frame of the electrically assisted bicycle.

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

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0018] Fig. 1 is a schematic view of the battery module installed in the battery accommodating cavity according to an embodiment of the present application;

[0019] Fig. 2 is a structural schematic view of an electrically assisted bicycle according to an embodiment of the present application;

[0020] Fig. 3 is a structural schematic view of a battery module according to an embodiment of the present application;

[0021] Fig. 4 is a structural schematic view of a battery module according to an embodiment of the present application;

[0022] Fig. 5 is a structural schematic view of a battery module according to an embodiment of the present application;

[0023] Fig. 6 is a partially exploded schematic view of a battery module according to an embodiment of the present application;

[0024] Fig. 7 is a partial structural schematic view of a battery module according to an embodiment of the present application;

[0025] Fig. 8 is a partial cross-sectional view of a battery cell according to an embodiment of the present application.

[0026] Explanation of reference signs: 1000, electrically assisted bicycle; 100, battery module; 101, battery pack; 10, battery cell; 11, shell; 12, battery cell body; 13, current cut-off valve; 131, pressure relief hole; 20, tab plate; 21, positive electrode connecting part; 22, negative electrode connecting part; 30, battery management circuit board; 40, battery cell support; 50, housing; 51, glue pouring hole; 52, observation hole; 53, air outlet hole; 60, heat conduction structure; 61, heat conductive glue; 70, electrically conductive part; 71, electrically conductive metal sheet; 71a, first electrically conductive metal sheet; 71b, second electrically conductive metal sheet; 72, body part; 73, first supporting arm; 74, second supporting arm; 75, first extending part; 76, second extending part; 77, first electrically conductive elastic member; 78, second electrically conductive elastic member; 91, analog signal acquisition circuit board; 92, electrical connection interface; 93, temperature sensor; 200, battery accommodating cavity; 300, bicycle frame; 301, supporting tube; 302, lower tube; 303, seat tube. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0028] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, 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", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0029] It should also be understood that the terms used in the specification and the appended claims are intended to be interpreted broadly and in a manner similar to commonly used dictionaries. It will be further understood by those skilled in the art that in some embodiments, equivalents to the functions described herein can often be

[0030] It should also be further understood that the terms "and", "or", as used herein, refer to a conjunction of at least one of the items that is conjoined, to the conjunction of all of the items that are conjoined, and to the conjunction of at least one of the items that are conjoined and all of the items that are conjoined.

[0031] Some embodiments of the present application will now be described in detail in connection with the accompanying drawings. The embodiments described below and features in the embodiments can be combined with each other, without conflict.

[0032] Referring to FIG. 1 and FIG. 2, the embodiments of the present application provide a battery module 100, which is configured to be installed in a battery accommodating cavity 200 of an electrically assisted bicycle 1000. When the electrically assisted bicycle 1000 needs assistance, the battery module 100 can power a driving device (not shown in the figure) of the electrically assisted bicycle 1000 to assist the electrically assisted bicycle 1000 to move forward. When the electrically assisted bicycle 1000 does not need electric assistance, such as when the electrically assisted bicycle 1000 is going downhill or the user applies pedaling force to drive the electrically assisted bicycle 1000 to move, the electrical connection between the battery module 100 and the driving device of the electrically assisted bicycle 1000 can be disconnected.

[0033] Referring to FIG. 1 and FIG. 2, in some embodiments, the electrically assisted bicycle 1000 includes a frame 300, and the frame 300 is provided with the battery accommodating cavity 200, and the battery module 100 is installed in the battery accommodating cavity 200.

[0034] The battery accommodating cavity 200 can be arranged at any suitable position of the frame 300. Referring to FIG. 1 and FIG. 2, in some embodiments, the frame 300 includes a support tube 301, and the support tube 301 is provided with the battery accommodating cavity 200. The support tube 301 can be any suitable tubular structure of the frame 300, such as the support tube 301 including at least one of the following: a down tube 302, a seat tube 303, an upper tube, and other tubes of the electrically assisted bicycle 1000. In this way, at least part of the battery module 100 can be installed in the original support tube 301 of the electrically assisted bicycle 1000, making full use of the space of the support tube 301, and minimizing the storage space of the electrically assisted bicycle 1000 occupied by the battery module 100, and minimizing the probability of increasing the volume of the electrically assisted bicycle 1000 due to the arrangement of the battery module 100. The battery accommodating cavity 200 is arranged in the original support tube 301 of the electrically assisted bicycle 1000, which has little effect on the overall appearance of the electrically assisted bicycle 1000, and is conducive to improving the aesthetics of the whole vehicle.

[0035] It can be understood that the structure and / or shape of the electrically assisted bicycle 1000 and the components in FIGS. 1 and 2 are only exemplary, and can be changed according to actual needs, and are not limited thereto.

[0036] At present, the battery module 100 of the electrically assisted bicycle 1000 is usually placed in the support tube 301 (such as the lower tube 302 or other tubes) of the electrically assisted bicycle 1000, but 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 waste of part of the space of the support tube 301, and also causing the energy storage capacity of the electrically assisted bicycle 1000 to decrease.

[0037] Referring to FIG. 3, in some embodiments, the battery module 100 includes battery cells 10, a tab plate 20, and a battery management circuit board 30. The number of battery cells 10 includes a plurality of battery cells 10, each battery cell 10 being columnar; the plurality of battery cells 10 are arranged in a line along the length direction of the battery accommodating cavity 200 to form a linear battery pack 101. The tab plate 20 is strip-shaped, the tab plate 20 is arranged substantially parallel to the arrangement direction of the plurality of battery cells 10, and the tab plate 20 is located at one side of the battery pack 101, the tab plate 20 is provided with a plurality of positive electrode connecting portions 21 and a plurality of negative electrode connecting portions 22. The battery management circuit board 30 is electrically connected with the tab plate 20, and the battery management circuit board 30 is used to monitor parameters of the plurality of battery cells 10, the parameters including at least one of the following: voltage, current, power, temperature, etc. Among them, the number of battery cells 10 in the cross section of the battery module 100 is one, the cross section is perpendicular to the length direction of the battery accommodating cavity 200, the positive electrode and the negative electrode of each battery cell 10 are respectively electrically connected with the positive electrode connecting portion 21 and the negative electrode connecting portion 22 of the tab plate 20, and the battery management circuit board 30 collects the parameters of the plurality of battery cells 10 through the tab plate 20.

[0038] The battery module 100 of the above embodiment arranges the plurality of columnar battery cells 10 in a linear battery pack 101 along the length direction, thereby saving the gap between the side-by-side battery cells 10 when the plurality of battery cells 10 are arranged side by side, miniaturizing the volume of the entire battery pack 101, and facilitating the adaptation to the internal space of the frame 300 of the electric assist bicycle 1000; in the case of a certain space of the battery accommodating cavity 200, the size of the cross section of the battery cell 10 can be designed to be larger, and / or the number of the 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. Moreover, the battery management circuit board 30 collects the parameters of each battery cell 10 through the long strip-shaped tab plate 20, that is, the battery management circuit board 30 is electrically connected with the battery cells 10 through the shared tab plate 20, without the need of separately arranging a plurality of wires for each battery cell 10 to be electrically connected with the battery management circuit board 30, thereby avoiding the formation of a wire bundle with a large volume, further compressing the space occupied by the battery module 100, and also avoiding the loosening of the terminal of one or more wires in the wire bundle in a vibrating environment (such as during the riding of the electric assist bicycle).

[0039] Exemplarily, the length direction of the battery accommodating cavity 200 is parallel to the X direction in FIG. 3. The arrangement direction of the plurality of battery cells 10 is parallel to the X direction in FIG. 3.

[0040] Referring to FIG. 3, in some embodiments, the battery module 100 includes one or more battery cells 10, each of which is columnar. The one or more battery cells 10 are arranged along the length direction of the battery accommodating cavity 200 to form a battery pack 101. In the case that the battery module 100 is installed in the battery accommodating cavity 200, the number of the battery cells 10 in the cross section of the battery module 100 perpendicular to the length direction of the battery accommodating cavity 200 is one, and the outer surface of the battery module 100 is close to the inner wall of the battery accommodating cavity 200.

[0041] The number of the 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 case that the number of the battery cells 10 in the cross section of the battery module 100 is at least two, the number of the battery cells 10 in the cross section of the battery module 100 of the present embodiment is one, thereby saving the gap between the side-by-side battery cells 10 when the at least two battery cells 10 are arranged side by side, miniaturizing the volume of the entire battery pack 101, and facilitating the adaptation to the internal space of the frame 300 of the electric assist bicycle 1000; in the case of a certain space of the battery accommodating cavity 200, the size of the cross section of the battery cell 10 can be designed to be larger, and / or the number of the 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.

[0042] 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, the space in the battery accommodating cavity 200 can be fully utilized, and in the case that the space in the battery accommodating cavity 200 is certain, the size of the cross section of the battery cell 10 can be designed as large as possible, and / or the number of the battery cell 10 can be designed 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.

[0043] The shape of the battery pack 101 can be any suitable shape, such as a straight line type, a non-straight line type, etc.

[0044] Referring to FIGS. 1 and 3, in some embodiments, the shape of the cross section 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 better close to the inner wall of the battery accommodating cavity 200, thereby making there be no or only a small remaining space in the battery accommodating cavity 200 when the battery module 100 is installed in the battery accommodating cavity 200. Illustratively, the envelope shape of the battery module 100 is generally consistent with the battery accommodating cavity 200; and / or the envelope shape of the battery pack 101 or the battery cell 10 is generally consistent with the battery accommodating cavity 200, so that there is no or only a small remaining space in the battery accommodating cavity 200 when the battery module 100 is installed in the battery accommodating cavity 200.

[0045] In some embodiments, the difference between the area of the cross section of the battery module 100 and the area of the cross section of the battery accommodating cavity 200 is less than a preset area threshold, so that the outer surface of the battery module 100 is better close to the inner wall of the battery accommodating cavity 200, thereby making there be no or only a small remaining space in the battery accommodating cavity 200 when the battery module 100 is installed in the battery accommodating cavity 200. Illustratively, the area of the cross section of the battery module 100 is less different from the area of the cross section of the battery accommodating cavity 200, for example, the difference between the area of the cross section of the battery module 100 and the area of the cross section of the battery accommodating cavity 200 is less than or equal to a first preset area threshold, so that there is no or only a small remaining space in the battery accommodating cavity 200 when the battery module 100 is installed in the battery accommodating cavity 200. Illustratively, the area of the cross section of the battery cell 10 is less different from the area of the cross section of the battery accommodating cavity 200, for example, the difference between the area of the cross section of the battery cell 10 and the area of the cross section of the battery accommodating cavity 200 is less than or equal to a second preset area threshold, so that there is no or only a small remaining space in the battery accommodating cavity 200 when the battery module 100 is installed in the battery accommodating cavity 200.

[0046] In some embodiments, the length of the battery module 100 is less than the length of the battery accommodating cavity 200 by 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 amount of residual space in the battery accommodating cavity 200. For example, the length of the battery module 100 is less than the length of the battery accommodating cavity 200 by a 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 amount of residual space in the battery accommodating cavity 200.

[0047] It can be understood that the thickness of the support pipe 301 or the battery accommodating cavity 200 of different vehicle models may not be consistent, and different specifications of the battery cell 10 or the battery module 100 can be selected for different thicknesses of the support pipe 301 or the battery accommodating cavity 200. Specifically, the structure and / or shape of the battery cell 10 or the battery module 100 can be designed according to the size, shape, and length of the support pipe 301 or the battery accommodating cavity 200. For example, the cross section of the battery pack 101 or the battery cell 10 is elliptical or circular, so that the maximum cross-sectional dimension of the battery pack 101 or the battery cell 10 matches the diameter of the battery accommodating cavity 200, that is, the larger the diameter of the battery accommodating cavity 200, the larger the diameter of the battery pack 101 or the battery cell 10 that can be selected. For example, when the length of the battery accommodating cavity 200 is about 570 mm, the cross-sectional dimension of the battery cell 10 ranges from 40 mm to 60 mm, such as 40 mm, 50 mm, 60 mm, or any other suitable value within the range of 40 mm to 60 mm; the length of the battery cell 10 ranges from 43 mm to 50 mm, such as 43 mm, 45 mm, 50 mm, or any other suitable value within the range of 43 mm to 50 mm. The cross-sectional dimension of the battery module 100 ranges from 45 mm to 65 mm, such as 45 mm, 50 mm, 65 mm, or any other suitable value within the range of 45 mm to 65 mm.

[0048] For example, the number of battery cells 10 can be designed according to actual needs, such as one, two, three, four, five, or more.

[0049] The battery cell 10 is columnar, which means that within the allowable range of processing errors, the battery cell 10 is columnar. The shape of the battery cell 10 can be cylindrical, elliptical cylindrical, or any other suitable columnar shape. For example, the battery cell 10 is cylindrical or elliptical cylindrical, so that the shape of the battery module 100 is more matched with the battery accommodating cavity 200 of the frame 300 of the electric-assisted bicycle 1000, so that the overall appearance of the electric-assisted bicycle 1000 is more coordinated, and the processing requirements for the frame 300 are reduced.

[0050] In some embodiments, the number of the electric cells 10 is one, and the positive and negative poles of the electric cell 10 are connected in a direction approximately parallel to the length direction of the battery accommodating cavity 200. In this way, the cross-sectional area of the single electric cell 10 can be reduced, and thus the cross-sectional area of the battery module 100 can be reduced, when the capacity of the electric cell 10 is constant. When the space of the battery accommodating cavity 200 is constant, the cross-sectional area of the battery module 100 can be increased, and thus the capacity of the battery module 100 can be increased, and the energy storage capability of the battery module 100 can be improved. It can be understood that the approximately parallel between A and B can include that the included angle between A and B is less than or equal to 15 degrees.

[0051] Referring to FIG. 3, in some embodiments, the number of the electric cells 10 is multiple, and the positive pole of one of the adjacent two electric cells 10 is electrically connected to the negative pole of the other electric cell 10. The number of the electric cells 10 can be increased, and thus the capacity of the battery module 100 can be increased, and the energy storage capability of the battery module 100 can be improved.

[0052] In some embodiments, the arrangement direction of the positive and negative poles of the electric cell 10 is consistent with the length direction of the battery accommodating cavity 200. In this way, the cross-sectional area of the single electric cell 10 can be reduced, and thus the cross-sectional area of the battery module 100 can be reduced, when the capacity of the electric cell 10 is constant. When the space of the battery accommodating cavity 200 is constant, the cross-sectional area of the battery module 100 can be increased, and thus the capacity of the electric cell 10 and the battery module 100 can be increased, and the energy storage capability of the battery module 100 can be improved. For example, the number of the electric cells 10 is multiple, and the arrangement direction of the positive and negative poles of the electric cell 10 is consistent with the length direction of the battery accommodating cavity 200. It can be understood that the consistency between C and D includes at least one of the following situations: C is completely consistent with D; the difference between C and D is within a preset threshold range.

[0053] Referring to FIG. 3 and FIG. 4, in some embodiments, the battery module 100 further includes an electric cell support 40 and a housing 50, the electric cell 10 is arranged on the electric cell support 40, and the electric cell support 40 is arranged in the housing 50. The electric cell support 40 can support the electric cell 10, the housing 50 can protect the components arranged in the housing 50, and the battery module 100 can be modularized, and thus the installation, carrying or transportation of the battery module 100 can be facilitated.

[0054] Referring to FIG. 4, in some embodiments, the battery module 100 further comprises a heat-conducting structure 60, which is arranged between the shell 50 and the battery cell 10, and the battery cell 10 is connected with the shell 50 through the heat-conducting structure 60. For example, the battery cell 10 is in heat-conducting connection with the 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 shell 50, so that the heat at the battery cell 10 can be dissipated in time, and the battery cell 10 can be prevented from being damaged due to excessive heat. For example, the heat-conducting structure 60 is fixedly connected with the battery cell 10, and the heat-conducting structure 60 is fixedly connected with the shell 50, so that the heat-conducting structure 60 can not only have a heat-conducting effect, but also can strengthen the fixation of the battery cell 10, improve the reliability of the battery module 100, and prevent the battery cell 10 from being loose or misaligned to cause poor contact.

[0055] The heat-conducting structure 60 can be any one of a heat-conducting glue 61, a heat-conducting metal structure, another heat-conducting structure, etc.

[0056] Referring to FIGS. 4 and 5, in some embodiments, the heat-conducting structure 60 comprises the heat-conducting glue 61, the shell 50 is provided with a plurality of glue injection holes 51 and a plurality of observation holes 52, at least one observation hole 52 is located between two adjacent glue injection holes 51, the glue injection hole 51 is used for inputting the heat-conducting glue 61, and the observation hole 52 is used for facilitating observation of the glue injection in the shell 50. In this way, the glue injection at different positions in the shell 50 can be more comprehensively observed, which is beneficial to preventing excessive glue injection or insufficient glue injection. The number of the glue injection holes 51 and / or the observation holes 52 can be designed according to actual needs, such as one, two, three, four or more.

[0057] Referring to FIG. 6, in some embodiments, the battery module 100 further comprises a plurality of conductive components 70, and two adjacent battery cells 10 are electrically connected through the conductive components 70 to realize series connection of the two adjacent battery cells 10. The series connection of the two battery cells 10 through the conductive components 70 reduces the contact resistance between the two battery cells 10, which is beneficial to reducing the energy loss of the battery module 100.

[0058] The conductive component 70 has conductivity, and can comprise at least one of a conductive metal sheet 71, a conductive spring, a conductive column, another suitable conductive component, etc. Referring to FIG. 6, in some embodiments, the conductive component 70 comprises the conductive metal sheet 71, and two adjacent battery cells 10 are electrically connected with the conductive metal sheet 71. In this way, the structure of the conductive component 70 is simple, and the welding process for electrical connection of the two adjacent battery cells 10 can be omitted, so that the battery module 100 is simple, convenient and fast to assemble. In addition, the conductive component 70 comprises the conductive metal sheet 71, which is beneficial to realizing surface contact and reducing the contact resistance when the two battery cells 10 are connected in series, so as to reduce the energy loss of the battery module 100.

[0059] Referring to FIG. 6, in some embodiments, the conductive component 70 includes a body portion 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 with one of the two adjacent battery cells 10, the second arm 74 is electrically connected with the other of the two adjacent battery cells 10, the first extension 75 is connected with the body portion 72, the second extension 76 is connected with the body portion 72, the second extension 76 is connected with the first extension 75, and the two adjacent battery cells 10 are electrically connected through the first extension 75 and the second extension 76. This structure is conducive to reducing the contact resistance between the two adjacent battery cells 10, reducing the capacity loss of the battery module 100, and facilitating the carrying of a larger current, thereby allowing a larger current output and / or input, which can improve the power of the electrically assisted bicycle 1000 and provide more power.

[0060] Referring to FIG. 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 body portion 72, a first arm 73, and a first extension 75, and the first extension 75 is connected with the body portion 72 of the first conductive metal sheet 71a. The second conductive metal sheet 71b includes a body portion 72, a second arm 74, and a second extension 76, and the second extension 76 is connected with the body portion 72 of the second conductive metal sheet 71b. In other embodiments, the conductive component 70 can also not be limited to the structure, shape, and / or number in FIG. 6, for example, the conductive component 70 includes a conductive metal sheet 71, and the body portion 72 of the conductive metal sheet 71 is not arc-shaped.

[0061] The number of the first arms 73 can be designed according to actual needs, for example, the number of the first arms 73 is one, two, three, four, or more. The first arms 73 can be arranged at any suitable position of the body portion 72. For example, the body portion 72 is arc-shaped, and at least one end of the body portion 72 is provided with the first arm 73. For example, both ends of the body portion 72 are provided with the first arm 73, which is conducive to increasing the contact area of the conductive component 70 with the battery cell 10, reducing the capacity loss of the battery module 100, and allowing a larger current output and / or input, which can improve the power of the electrically assisted bicycle 1000 and provide more power. For another example, one end of the body portion 72 is provided with at least two first arms 73, and the plurality of first arms 73 are arranged at intervals, which is conducive to increasing the contact area of the conductive component 70 with the battery cell 10, and the gap between the adjacent first arms 73 can save materials and reduce weight.

[0062] The structure, shape, and / or number of the first extension 75 and / or the second extension 76 can be designed according to actual needs, which is not limited herein. The first extension 75 and the second extension 76 are adapted to be better connected.

[0063] The body part 72 can be of any suitable shape, such as a disc, a piece of arc, other regular or irregular shape, etc. Exemplarily, the body part 72 is of arc shape, thus, material can be saved and weight can be reduced. Exemplarily, the body part 72 is of arc shape, the diameter of the arc shape can be designed to be large, so that the conductive metal sheet 71 can bear a large current, so that the battery module 100 can allow a larger current output and / or input, which is beneficial to improve the power of the electrically assisted bicycle 1000 and provide stronger power.

[0064] Exemplarily, the first branch arm 73 and / or the second branch arm 74 is provided with a plurality of welding points, which is beneficial to bear a large current and can allow a larger current output and / or input, which is beneficial to improve the power of the electrically assisted bicycle 1000 and provide stronger power.

[0065] Referring to FIG. 7, in some embodiments, the conductive part 70 comprises a first conductive elastic member 77 abutting between two adjacent battery cells 10, so that reliable electrical connection between the two adjacent battery cells 10 can be ensured, even if there is a certain installation tolerance or error between the two adjacent battery cells 10, the two adjacent battery cells 10 can also be reliably electrically connected after assembly. The first conductive elastic member 77 can include at least one of the following: a conductive spring, a conductive spring, any other suitable conductive elastic member, etc.

[0066] Referring to FIG. 7, in some embodiments, the conductive part 70 further comprises a second conductive elastic member 78 abutting the side surface of the battery cell 10 to collect the parameters of the battery cell 10 through the second conductive elastic member 78. The way that the second conductive elastic member 78 contacts the side surface of the battery cell 10 can further reduce the size of the battery module 100 in the length direction. Exemplarily, the second conductive elastic member 78 has conductivity and elasticity, which can make the second conductive elastic member 78 reliably abut the battery cell 10, even if there is a certain installation tolerance or error, the second conductive elastic member 78 can also be reliably electrically connected with the battery cell 10, thereby providing a guarantee for reliably collecting the parameters of the battery cell 10.

[0067] Referring to FIG. 3 and FIG. 6, in some embodiments, the battery module 100 further comprises a tab plate 20, the tab plate 20 is strip-shaped, the tab plate 20 is arranged substantially parallel to the arrangement direction of the plurality of battery cells 10, and the tab plate 20 is located at one side of the plurality of battery cells 10, the plurality of conductive components 70 are fixedly connected with the tab plate 20, and the plurality of conductive components 70 are electrically connected with the tab plate 20, so as to collect the parameters of each battery cell 10 through the tab plate 20 and the plurality of conductive components 70. In this way, the parameters of each battery cell 10 can be collected by sharing the tab plate 20, without the need to separately arrange a plurality of wires for each battery cell 10 to collect the parameters of each battery cell 10, so as to avoid forming a wire bundle with a large volume, further compress the space occupied by the battery cells 10, and also avoid that the terminal of one or more wires in the wire bundle is easily loosened in a vibrating environment (such as during riding of an electrically assisted bicycle).

[0068] Exemplarily, the second conductive elastic member 78 abuts against the side surface of the battery cell 10, and the second conductive elastic member 78 abuts against or is arranged on the tab plate 20, so that the battery cell 10 is electrically connected with the tab plate 20 through the second conductive elastic member 78.

[0069] Referring to FIG. 6, in some embodiments, the conductive component 70 comprises a first conductive metal sheet 71a and a second conductive metal sheet 71b, the first conductive metal sheet 71a is electrically connected with the positive electrode of one of the two adjacent battery cells 10, the second conductive metal sheet 71b is electrically connected with the negative electrode of the other battery cell 10, and the first conductive metal sheet 71a and the second conductive metal sheet 71b are both electrically connected with the tab plate 20, so as to realize the series connection of the two adjacent battery cells 10. By respectively electrically connecting the first conductive metal sheet 71a and the second conductive metal sheet 71b with the two adjacent battery cells 10, the assembly of the battery pack 101 is facilitated. Exemplarily, the first conductive metal sheet 71a and the second conductive metal sheet 71b are connected, the first conductive metal sheet 71a and the second conductive metal sheet 71b are electrically connected, and the first conductive metal sheet 71a and the second conductive metal sheet 71b are both electrically connected with the tab plate 20, so as to realize the series connection of the two adjacent battery cells 10 and collect the parameters of the two adjacent battery cells 10 through the first conductive metal sheet 71a, the second conductive metal sheet 71b and the tab plate 20, without the need to additionally arrange a conductive structure to electrically connect the tab plate 20 with the battery cell 10, which is conducive to simplifying the structure of the battery module 100 and further compressing the space occupied by the battery module 100. Exemplarily, the first extension part 75 of the first conductive metal sheet 71a and the second extension part 76 of the second conductive metal sheet 71b are both connected with the tab plate 20.

[0070] In some embodiments, the first conductive metal sheet 71a is welded to the positive electrode of one of the two adjacent battery cells 10, and the second conductive metal sheet 71b is welded to the negative electrode of the other battery cell 10. The first conductive metal sheet 71a and the second conductive metal sheet 71b are welded to the tab plate 20. The connection is achieved by welding, which can improve the reliability of the battery module 100 and avoid poor electrical contact of the battery module 100 in a vibrating use environment (for example, during the riding of the electrically assisted bicycle 1000).

[0071] Referring to FIG. 3, in some embodiments, the battery module 100 further includes a battery management circuit board 30 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, power, temperature, etc. For example, the battery management circuit board 30 can manage and / or maintain the battery cells 10, prevent overcharging and / or over-discharging of the battery module 100, prolong the service life of the battery module 100, and monitor the parameters and / or status of the battery module 100. For example, the battery management circuit board 30 includes an AFE (analog front-end) acquisition circuit, a driving circuit, and a power estimation and control circuit. The driving circuit is configured to drive and control charging and / or discharging. The power estimation and control circuit can estimate the power based on the acquired parameter information of the battery cells 10, control the driving circuit to switch the battery module 100, detect the status of the battery module 100, and implement abnormal protection of the battery module 100.

[0072] Referring to FIG. 8, in some embodiments, the battery cell 10 includes a housing 11, a battery cell body 12, and a current cutoff valve 13. The battery cell body 12 is arranged in the housing 11. The current cutoff valve 13 is configured to be electrically connected to the battery cell body 12 in a first state and to be disconnected from the battery cell body 12 in a second state. The first state includes a normal working state of the battery module 100, and the second state includes an abnormal exhaust state of the battery module 100. In the first state, the current cutoff valve 13 is electrically connected to the battery cell body 12, so that the battery cell body 12 of the battery cell 10 is electrically connected to another battery cell 10, ensuring that the battery module 100 can work normally. When the current cutoff valve 13 is in the second state, the current cutoff valve 13 is disconnected from the battery cell body 12, preventing the current cutoff valve 13 from being electrically connected to the battery cell body 12 to continuously generate heat or gas, which can increase the pressure in the housing 11. This is beneficial to reduce the probability of explosion or failure of the battery module 100 in the abnormal exhaust state and improve the safety of the battery module 100.

[0073] Exemplarily, in the abnormal exhaust state, the gas amount of the gas generated by the cell body 12 is greater than or equal to a preset threshold, or the pressure in the shell 11 is greater than or equal to a preset pressure threshold. In the normal working state, the gas amount of the gas generated by the cell body 12 is less than the preset threshold, or the pressure in the shell 11 is less than the preset pressure threshold.

[0074] Referring to FIG. 8, in some embodiments, the battery module 100 comprises a housing 50, the cell 10 is arranged in the housing 50, the housing 50 is provided with a gas outlet hole 53, and the current cutoff valve 13 is provided with a pressure relief hole 131; when the battery module 100 is in the first state, the pressure relief hole 131 is in a closed state; when the battery module 100 is in the second state, the pressure relief hole 131 is in an open state, and the pressure relief hole 131 communicates with the gas outlet hole 53. When the battery module 100 is in the second state, the pressure relief hole 131 is in the open state, and the pressure relief hole 131 can timely exhaust the gas in the shell 11, preventing the pressure in the shell 11 from being too large to cause the explosion or failure of the battery module 100, and effectively improving the safety of the battery module 100. The gas outlet hole 53 can be the observation hole 52 or the glue pouring hole 51. The gas outlet hole 53 can also not be the observation hole 52 or the glue pouring hole 51, for example, the observation hole 52 and the glue pouring hole 51 are omitted, and the housing 50 is provided with the gas outlet hole 53.

[0075] The structure of the pressure relief hole 131 can be any suitable shape. Exemplarily, a score mark or a cut is formed in the current cutoff valve 13 to form the pressure relief hole 131. The score mark or the cut (pressure relief hole 131) is designed to break due to the deformation (such as upside down) of the current cutoff valve 13, so that the pressure inside the shell 11 is released (the generated gas is released). The material of the current cutoff valve 13 is a flexible material that can deform due to the abnormal internal pressure in the shell 11. For example, the current cutoff valve 13 made of aluminum or other materials with certain flexibility is suitable.

[0076] In some embodiments, the battery management circuit board 30 is electrically connected to the tab plate 20 through a flexible circuit board (FPC), so as to avoid the use of a wire harness, save space, further compress the space occupied by the battery module 100, facilitate the setting of a battery module 100 with larger capacity in the case that the space of the battery accommodating cavity 200 is certain, and avoid the loosening of one or more wire terminals in the wire harness in a vibrating environment (such as during the riding of an electrically assisted bicycle).

[0077] In some embodiments, the tab plate 20 is a FPC, and the tab plate 20 is arranged close to the side surface of the cell 10. The tab plate 20 is a flexible circuit board, which is convenient for close arrangement to the cell 10. The close arrangement of the tab plate 20 to the side surface of the cell 10 is conducive to saving space and further compressing the space occupied by the battery module 100.

[0078] In some embodiments, the battery module 100 further comprises an analog signal acquisition circuit board 91, and the battery management circuit board 30 is electrically connected with the lug plate 20 through the analog signal acquisition circuit board 91. The analog signal acquisition circuit board 91 can acquire parameters of each battery cell 10 through the lug plate 20 and send 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 one circuit board.

[0079] Referring to FIG. 3, in some embodiments, the analog signal acquisition circuit board 91 and the battery management circuit board 30 are stacked, and the analog signal acquisition circuit board 91 and the battery management circuit board 30 are located at one end of the battery cell 10 package formed by the plurality of battery cells 10, and 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. In this way, the radial size or cross-sectional size of the battery module 100 can be reduced, and the battery module 100 can be easily placed in the frame 300 of the electric-assisted bicycle 1000.

[0080] Referring to FIG. 3, the battery module 100 further comprises an electrical connection interface 92, and the battery module 100 is electrically connected with external components through the electrical connection interface 92, so as to realize charging and / or discharging.

[0081] In the embodiments of the present application, a customized battery cell 10 stacking scheme is adopted, each battery cell 10 is in a cylindrical shape, the size is 5048 (diameter of 50 mm and height of 48 mm), and 10 battery cells 10 are designed in series. The shell 11 of the battery cell 10 is designed with high-strength steel shell, the diameter is 50 mm and the height is 48 mm, and after using a high-energy-density electrochemical system, the energy density can be above 280 Wh / kg. A current interrupt device (CID) is introduced into the battery cell 10, which includes a current interrupt valve 13 and a pressure relief hole 131. When the internal pressure of the battery cell 10 is too large, the pressure relief hole 131 can be opened, and at the same time the current interrupt valve 13 interrupts the conduction current, which can effectively avoid the dangers of overcharging, short circuit, and over-temperature of the battery cell 10, and plays a safety protection role for the battery cell 10. The battery cell 10 adopts full-tab technology, which can reduce the equivalent resistance of the busbar, support large-current charging and discharging, and can improve the power of the electric-assisted bicycle 1000 and provide stronger power. When a single battery cell 10 abnormally overheats, the CID will be flipped, and a large amount of gas will be discharged from the battery cell 10. The battery module 100 reserves an exhaust passage, and other components can pass through the exhaust passage to the outside, thereby achieving the effect of heat runaway exhaust.

[0082] The battery pack 101 stack adopts a long cylinder type cylindrical stack scheme, with a single large cylindrical cell 10 as a single section, the positive and negative electrodes of the cell 10 are respectively welded out by the protruding points of the conductive metal sheet 71, and the positive conductive metal sheet 71 (such as the first conductive metal sheet 71a described above) and the negative conductive metal sheet 71 (such as the second conductive metal sheet 71b described above) of the adjacent two cells 10 are laser welded in double layers of conductive metal sheets 71 on the tab plate 20 on the side of the battery pack 101 to realize the series connection between the cells 10, and the positive electrode of the battery module 100 is connected to the battery management circuit board 30 through the positive electrode lead of the uppermost 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 bottommost cell 10.

[0083] In addition to the protruding point welding connection of the conductive metal sheet 71 in the above module stack scheme, the series connection between the cells 10 can also be realized by the metal spring contact method, similar to the dry battery flashlight scheme, a plurality of metal springs (corresponding to the first conductive elastic member 77 described above) are added to the positive electrode of the cell 10 by laser welding, and the metal springs contact the negative electrode of the previous cell 10, thereby realizing the series connection between the adjacent two cells 10.

[0084] After adopting the flashlight type stack scheme, the cell 10 voltage is led out without the conductive metal sheet 71, and since the shell 50 of the cell 10 is the negative electrode of the cell 10, the voltage of the cell 10 can also be led out through the side, and the second conductive elastic member 78 is added to the tab plate 20 to realize the sampling of the voltage of the cell 10; in addition, a thermistor or temperature sensor 93 (see FIG. 7) can also be attached to the tab plate 20, which is in close contact with the surface of the cell 10 to measure the temperature of the cell 10.

[0085] The cell 10 voltage sampling is integrated on the tab plate 20, the cell 10 series protruding point welding contact piece can lead out the voltage of each series cell 10, the tab plate 20 is connected to the analog signal acquisition chip on the analog signal acquisition circuit board 91 through the PCB wiring and the 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 is designed with FPC, the tab plate 20 is in close contact with the cell 10, the tab plate 20 is crimped to the analog signal acquisition circuit board 91 through 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 connected to the battery management circuit board 30 through a connector, and the battery management circuit board 30 includes charging and discharging MOS, fuse, etc.

[0086] Exemplarily, the battery cell 10 can be first fixed and supported by the battery cell support 40 to form a long cylindrical battery pack 101, and then inserted into the shell 50, and then a plurality of glue pouring holes 51 are opened on the shell 50, and glue is injected into the shell 50 through the glue pouring holes 51, and after the glue is cured, the battery cell 10 can be fixed. Exemplarily, the number of glue pouring holes 51 is 3, and the number of observation holes 52 is 6.

[0087] Please refer to the application also provides an electric assist bicycle 1000, including frame 300 and battery module 100, frame 300 including support tube 301 provided with battery containing cavity 200. The battery module 100 is arranged in the battery containing cavity 200.

[0088] It should be noted that the electric assist bicycle 1000 or the battery module 100 described in the embodiment has the same or similar structure and principle as the electric assist bicycle 1000 or the battery module 100 of all the foregoing embodiments, and those skilled in the art can clearly know that one or more embodiments of the foregoing embodiments can be applied to the electric assist bicycle 1000 or the battery module 100 of the embodiment, and the embodiment will not be repeated here.

[0089] In the present application, unless otherwise explicitly specified and limited, "mounting", "connecting", "connecting", "mechanically coupling", "coupling" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected. It can be mechanically connected or electrically connected. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication between two elements or the interaction 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 transmission mechanism, etc. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0090] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0091] The above disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the present application, components and settings of specific examples are described in the above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0092] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific method steps, features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific method steps, features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0093] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery module, characterized by, The battery module is configured to be installed in a battery accommodating cavity of an electrically assisted bicycle, and the battery module comprises: a plurality of battery cells, each of which is columnar, and the plurality of battery cells are arranged in a straight line along the length direction of the battery accommodating cavity to form a straight-line battery pack; a tab plate in the shape of a long strip, the tab plate is arranged substantially parallel to the arrangement direction of the plurality of battery cells, and the tab plate is located on one side of the battery pack, the tab plate is provided with a plurality of positive electrode connection parts and a plurality of negative electrode connection parts; and a battery management circuit board electrically connected with the tab plate, used for monitoring parameters of the plurality of battery cells, the parameters including at least one of voltage, current, power and temperature. In the cross section of the battery module, the number of battery cells is one, the cross section is perpendicular to the length direction of the battery accommodating cavity, the positive electrode and the negative electrode of each battery cell are electrically connected with the positive electrode connection part and the negative electrode connection part of the tab plate respectively, and the battery management circuit board collects the parameters of the plurality of battery cells through the tab plate.

2. A battery module, characterized by, The battery module is configured to be installed in a battery accommodating cavity of an electrically assisted bicycle, and the battery module comprises: one or more battery cells, each of which is columnar, and the one or more battery cells are arranged along the length direction of the battery accommodating cavity to form a battery pack; wherein, when the battery module is installed in the battery accommodating cavity, the number of 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 of claim 2, wherein, The number of battery cells is one, and the connecting line of 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 of claim 2, wherein, The number of battery cells is a plurality, the positive electrode of one of the two adjacent battery cells is electrically connected with the negative electrode of the other battery cell; and / or, the arrangement direction of the positive electrode and the negative electrode of the battery cell is consistent with the length direction of the battery accommodating cavity.

5. The battery module of claim 2, wherein, The shape of the cross section of the battery module is matched 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 of claim 2, wherein, The battery module further comprises: a battery cell support, the battery cell is arranged in the battery cell support; a shell, the battery cell support is arranged in the shell.

7. The battery module of claim 6, wherein, The battery module further comprises: a heat conduction structure arranged between the shell and the battery cell, and the battery cell is connected with the shell through the heat conduction structure.

8. The battery module of claim 7, wherein, The heat conduction structure comprises heat conduction glue, a plurality of glue filling holes and a plurality of observation holes are formed in the shell, at least one of the observation holes is located between two adjacent glue filling holes, the glue filling hole is used for inputting the heat conduction glue, and the observation hole is used for facilitating observation of the glue filling condition in the shell.

9. The battery module of claim 4, wherein, The battery module further comprises a plurality of conductive components, two adjacent battery cells are electrically connected by the conductive components to realize series connection of the two adjacent battery cells.

10. The battery module of claim 9, wherein, The conductive component comprises a conductive metal sheet, and two adjacent battery cells are electrically connected with the conductive metal sheet.

11. The battery module of claim 10, wherein, The conductive component comprises: a body part; a first branch arm electrically connected with one of the two adjacent battery cells; a second branch arm electrically connected with the other of the two adjacent battery cells; a first extension part connected with the body part; a second extension part connected with the body part, and the second extension part is connected with the first extension part; wherein the two adjacent battery cells are electrically connected by the first extension part and the second extension part.

12. The battery module of claim 9, wherein, The conductive component comprises a first conductive elastic member abutting between two adjacent battery cells.

13. The battery module of claim 12, wherein, The conductive component further comprises a second conductive elastic member abutting a side surface of the battery cell to collect parameters of the battery cell through the second conductive elastic member.

14. The battery module of claim 9, wherein, The battery module further comprises: a tab plate in a strip shape, the tab plate is arranged substantially parallel to the arrangement direction of the plurality of battery cells, and the tab plate is located on one side of the plurality of battery cells, a plurality of conductive components are fixedly connected with the tab plate and electrically connected with the tab plate to collect parameters of each battery cell through the tab plate and the plurality of conductive components.

15. The battery module of claim 14, wherein, The conductive component comprises a first conductive metal sheet and a second conductive metal sheet, the first conductive metal sheet is electrically connected with a positive electrode of one of the two adjacent battery cells, the second conductive metal sheet is electrically connected with a negative electrode of the other battery cell, and the first conductive metal sheet and the second conductive metal sheet are electrically connected with the tab plate to realize series connection of the two adjacent battery cells.

16. The battery module of claim 15, wherein, The first conductive metal sheet is welded with a positive electrode of one of the two adjacent battery cells, the second conductive metal sheet is welded with a negative electrode of the other battery cell, and the first conductive metal sheet and the second conductive metal sheet are welded together with the tab plate.

17. The battery module of claim 14, wherein, The battery module further comprises: a battery management circuit board electrically connected with the tab plate, used for monitoring parameters of the battery cell, the parameters comprising at least one of voltage, current, power, and temperature.

18. The battery module of claim 1 or 4, wherein, The battery cell comprises: a shell; a battery cell body arranged in the shell; a current cut-off valve configured to be electrically connected with the battery cell body in a first state and to be disconnected from the battery cell body in a second state; wherein the first state comprises a normal working state of the battery module, and the second state comprises an abnormal exhaust state of the battery module.

19. The battery module of claim 18, wherein, The battery module comprises 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 in communication with the air outlet.

20. An electrically assisted bicycle, characterised in that Comprising: a frame comprising a support tube provided with a battery accommodating cavity; and the battery module of any one of claims 1-19.

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