Cylindrical battery module and battery pack

Abstract

The embodiment of the utility model discloses a cylindrical battery module and a battery pack. The cylindrical battery module comprises a battery cell assembly, a first acquisition circuit board, a second acquisition circuit board and a BMS (Battery Management System) module, the battery cell assembly comprises a plurality of cylindrical battery cells, the first acquisition circuit board and the second acquisition circuit board are arranged on the two opposite sides of the battery cell assembly respectively, and the first acquisition circuit board and the second acquisition circuit board are both perpendicular to the cylindrical battery cells; the first acquisition circuit board and the second acquisition circuit board are electrically connected to the cylindrical battery cells, the BMS module is arranged on the battery cell assembly and located on one side of the radial direction of the cylindrical battery cells, and the BMS module is electrically connected to the first acquisition circuit board and the second acquisition circuit board. According to the invention, the BMS module is located between the first acquisition circuit board and the second acquisition circuit board, thereby facilitating the lead of the two acquisition circuit boards, reducing the wiring paths of the acquisition circuit boards and the BMS module, facilitating the fixation of a wiring harness, and improving the space utilization rate.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of batteries, in particular to a cylindrical battery module and a battery pack. BACKGROUND

[0002] The cylindrical battery module generally comprises a cell assembly, a BMS module and two acquisition circuit boards, the cell assembly comprises a plurality of cylindrical cells, each cylindrical cell extends vertically, the two acquisition circuit boards are located at the upper and lower ends of the cell assembly respectively, and the BMS module is arranged at the top of the cell assembly. The acquisition circuit board at the bottom needs to extend to the top of the cylindrical battery module through a wire harness to be connected to the BMS module. As a result, the wire harness of the acquisition circuit board at the bottom is too long, the fixing of the wire harness is difficult, and the requirement for the internal space of the battery pack is increased, thereby increasing the design difficulty of the battery pack. CONTENT OF THE UTILITY MODEL

[0003] The present disclosure provides a cylindrical battery module and a battery pack, which reduces the wiring path of the acquisition circuit board and the BMS module, facilitates the fixing of the wire harness, and improves the space utilization.

[0004] In a first aspect, the utility model provides a cylindrical battery module, comprising:

[0005] a cell assembly, the cell assembly comprising a plurality of cylindrical cells;

[0006] a first acquisition circuit board and a second acquisition circuit board, the first acquisition circuit board and the second acquisition circuit board being arranged on opposite sides of the cell assembly, and the first acquisition circuit board and the second acquisition circuit board being perpendicular to the cylindrical cells, and the first acquisition circuit board and the second acquisition circuit board being electrically connected to each cylindrical cell;

[0007] a BMS module, the BMS module being arranged on the cell assembly on a side in the radial direction of the cylindrical cells, and the BMS module being electrically connected to the first acquisition circuit board and the second acquisition circuit board respectively.

[0008] Optionally, the cell assembly comprises a shell;

[0009] the shell has a cell cavity, and each cylindrical cell is arranged in the cell cavity;

[0010] the shell has a side plate and two end plates, and the two end plates are respectively located at the two ends of each cylindrical cell in the length direction;

[0011] the side plate is parallel to the cylindrical cells, and the side plate connects the two end plates;

[0012] The first collecting circuit board and the second collecting circuit board are arranged on the two end plates respectively, and the BMS module is arranged on the side plate.

[0013] Optionally, the BMS module has a first data interface and a second data interface.

[0014] The first data interface is arranged on a side of the BMS module close to one of the end plates, and the second data interface is arranged on a side of the BMS module close to the other end plate.

[0015] The first data interface is used to be connected to the first collecting circuit board through a data line, and the second data interface is used to be connected to the second collecting circuit board through a data line.

[0016] Optionally, the side plate of the shell is provided with a mounting groove, and the BMS module is embedded and mounted in the mounting groove.

[0017] Optionally, the side plate of the shell is provided with a baffle, and the baffle forms a mounting groove.

[0018] The baffle is provided with an electricity-connection-avoiding gap.

[0019] Optionally, the shell comprises two half shells, and the half shells comprise the end plates and the bent plates connecting the end plates.

[0020] In the state that the two half shells are buckled, the electric core cavity is formed between the two half shells, the bent plates of the two half shells are spliced to form the side plate, and a gap is formed between the bent plates of the two half shells.

[0021] The BMS module covers part of the gap.

[0022] Optionally, the first collecting circuit board and the second collecting circuit board both have a gap with the circumferential edge of the electric core assembly.

[0023] Optionally, the first collecting circuit board and the second collecting circuit board are both flexible circuit boards.

[0024] In a second aspect, the embodiments of the present disclosure also provide a battery pack, comprising:

[0025] A shell having a cavity;

[0026] The cylindrical battery module is accommodated in the cavity.

[0027] Optionally, the shell has a bottom cover, a middle barrel and a top cover.

[0028] The middle barrel has the cavity, a top opening and a bottom opening communicating with the cavity.

[0029] The top cover is connected to the middle barrel to close the top opening, and the bottom cover is connected to the middle barrel to close the bottom opening.

[0030] The first acquisition circuit board, the second acquisition circuit board and the BMS module are located between the electric cell assembly and the middle barrel, and the arrangement direction of the first acquisition circuit board and the second acquisition circuit board is perpendicular to the arrangement direction of the bottom cover and the top cover.

[0031] The BMS module of the cylindrical battery module provided by the embodiment of the present disclosure is located between the first acquisition circuit board and the second acquisition circuit board, which facilitates the lead wires of the two acquisition circuit boards, reduces the wiring path of the acquisition circuit board and the BMS module, facilitates the fixation of the wire harness, and improves the space utilization.

[0032] The technical solutions of the present disclosure will be further described in detail below with the help of the accompanying drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which form a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0034] The present disclosure can be more clearly understood by referring to the following detailed description in conjunction with the accompanying drawings, in which:

[0035] Figure 1 A perspective structural schematic diagram of a cylindrical battery module provided by an embodiment of the present disclosure is shown;

[0036] Figure 2 An exploded view of a cylindrical battery module provided by an embodiment of the present disclosure is shown;

[0037] Figure 3 A structural schematic diagram of a battery pack provided by an embodiment of the present disclosure is shown;

[0038] Figure 4 A structural schematic diagram of a battery pack provided by an embodiment of the present disclosure is shown.

[0039] In the drawings, 100, cylindrical battery module; 1, electric cell assembly; 11, shell; 11a, half shell; 111, side plate; 1111, baffle; 11111, power connection avoidance opening; 1112, mounting groove; 112, end plate; 113, gap; 12, cylindrical cell; 2, first acquisition circuit board; 3, second acquisition circuit board; 4, BMS module; 41, first data interface; 5, aluminum bar; 200, housing; 210, bottom cover; 220, middle barrel; 230, top cover.

[0040] It should be noted that the drawings and the written description are not intended to limit the scope of the present application in any way, but are merely to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0042] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices 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.

[0043] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. 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.

[0044] Figure 1 A perspective structural schematic diagram of a cylindrical battery module provided by the embodiment of the present application is shown, Figure 2 An exploded view of the cylindrical battery module provided by the embodiment of the present application is shown. The cylindrical battery module 100 provided by the embodiment of the present application comprises a battery cell assembly 1, a first acquisition circuit board 2, a second acquisition circuit board 3 and a BMS module 4. The battery cell assembly 1 comprises a plurality of cylindrical battery cells 12, the first acquisition circuit board 2 and the second acquisition circuit board 3 are arranged on opposite sides of the battery cell assembly 1, and the first acquisition circuit board 2 and the second acquisition circuit board 3 are both perpendicular to the cylindrical battery cells 12, and the first acquisition circuit board 2 and the second acquisition circuit board 3 are both electrically connected to each cylindrical battery cell 12. The BMS module 4 is not arranged on one side of the first acquisition circuit board 2, nor on one side of the second acquisition circuit board 3. In the embodiment of the present application, the BMS module 4 is arranged on the side of the battery cell assembly 1, that is, the BMS module 4 is located between the first acquisition circuit board 2 and the second acquisition circuit board 3, and the BMS module 4 is relatively close to the first acquisition circuit board 2 and the second acquisition circuit board 3, which facilitates the first acquisition circuit board 2 and the second acquisition circuit board 3 to be connected to the BMS module 4 through short data lines respectively.

[0045] The process height direction of the cylindrical battery module 100 and the length direction of the cylindrical battery cell 12 are perpendicular, the first acquisition circuit board 2 and the second acquisition circuit board 3 are located at two ends of the length direction of the cylindrical battery cell 12, and therefore the first acquisition circuit board 2 and the second acquisition circuit board 3 are not located at two ends of the process height direction of the cylindrical battery module 100, and the arrangement direction of the first acquisition circuit board 2 and the second acquisition circuit board 3 is perpendicular to the process height direction of the cylindrical battery module 100. The BMS module 4 can be located at one side of the radial direction of the cylindrical battery cell 12 of the battery cell assembly 1, the BMS module 4 can be located at a middle position of the process height direction of the battery cell assembly 1, the BMS module 4 can also be located at a position close to the top end of the process height direction of the battery cell assembly 1, and the BMS module 4 can also be located at a position close to the bottom end of the process height direction of the battery cell assembly 1. When the BMS module 4 is located at a position close to the bottom end of the cylindrical battery module 100, the electrical interface on the battery pack with the cylindrical battery module 100 can be arranged at the bottom of the battery pack, facilitating the connection between the BMS module 4 and the electrical interface.

[0046] In the embodiment of the present disclosure, the BMS module 4 is located between the first acquisition circuit board 2 and the second acquisition circuit board 3, facilitating the lead wires of the two acquisition circuit boards, reducing the wiring path of the acquisition circuit board and the BMS module 4, facilitating the fixation of the wire harness, and improving the space utilization.

[0047] What is needed is that each cylindrical battery cell 12 of the battery cell assembly 1 is arranged horizontally rather than vertically, and the horizontal arrangement means that the extension direction, i.e., the length direction, of each cylindrical battery cell 12 is horizontal rather than vertical after the cylindrical battery module 100 is installed on a carrier, such as a two-wheeled vehicle. The cylindrical battery module 100 provided by the embodiment of the present disclosure is horizontally stacked, which can be stacked to a higher height compared with the vertical arrangement, is sufficient to form a space for installing the BMS module 4 at the side, and does not need to arrange the BMS module 4 at the top of the process of the cylindrical battery module 1, thereby improving the space utilization and facilitating the lead wires of the two acquisition circuit boards.

[0048] In some possible embodiments, as shown in Figure 1 and Figure 2 The battery cell assembly 1 includes a shell 11, the shell 11 has a battery cell cavity, each cylindrical battery cell 12 is arranged in the battery cell cavity, the shell 11 has a side plate 111 and two end plates 112, the two end plates 112 are respectively located at two ends of each cylindrical battery cell 12 along the length direction, the side plate 111 is parallel to the cylindrical battery cell 12, the side plate 111 connects the two end plates 112, the first acquisition circuit board 2 and the second acquisition circuit board 3 are separately arranged at the two end plates 112, and the BMS module 4 is arranged on the side plate 111.

[0049] It should be noted that, because in the embodiments of the present disclosure, the cylindrical battery cells 12 of the cylindrical battery module 100 are arranged transversely, the two end plates 112 are not the process top and bottom of the cylindrical battery module 100, but are the process sides of the cylindrical battery module 100, that is, the arrangement direction of the two end plates 112 is perpendicular to the process height direction of the cylindrical battery module 100. The process top and bottom of the cylindrical battery module 100 are not provided with the acquisition circuit board and the BMS module 4.

[0050] In some possible embodiments, the BMS module 4 has a first data interface 41 and a second data interface, the first data interface 41 is located on the side of the BMS module 4 close to one end plate 112, and the second data interface is located on the side of the BMS module 4 close to the other end plate 112, the first data interface 41 is used to be connected to the first acquisition circuit board 2 through a data line, and the second data interface is used to be connected to the second acquisition circuit board 3 through a data line.

[0051] The BMS module 4 is provided with data interfaces on both sides, the data interface close to the first acquisition circuit board 2 can be connected to the first acquisition circuit board 2 through a shorter data line, and the data interface close to the second acquisition circuit board 3 can be connected to the second acquisition circuit board 3 through a shorter data line. The data lines drawn from the first acquisition circuit board 2 and the second acquisition circuit board 3 to the BMS module 4 are substantially the same in length and are relatively short, the data lines have good fixing effect, and the data lines will not have large shaking displacement.

[0052] In some possible embodiments, as shown in Figure 1 and Figure 2 The side plate 111 of the shell 11 is provided with a mounting groove 1112, and the BMS module 4 is embedded and mounted in the mounting groove 1112.

[0053] The mounting groove 1112 facilitates quick assembly of the BMS module 4, and the mounting groove 1112 also has a protective effect on the BMS module 4. After the cylindrical battery module 100 is loaded into the cavity of the battery pack shell 200, because of the mounting groove 1112, the BMS module 4 can be prevented from contacting the battery pack shell 200.

[0054] In some possible embodiments, the side plate 111 of the shell 11 is provided with a baffle 1111, which encloses a mounting groove 1112, and the baffle 1111 is provided with an electricity connection avoiding gap 11111. The baffle 1111 protrudes from the surface of the side plate body, and the extension length of the baffle 1111 in the direction perpendicular to the side plate 111 is greater than the thickness of the BMS module 4, so that the BMS module 4 does not protrude from the baffle 1111 when mounted in the mounting groove 1112. The mounting groove 1112 is enclosed by the baffle 1111 provided on the outer surface of the side plate body, and does not occupy the space of the side plate body, and does not affect the structural strength of the side plate body. The electricity connection avoiding gap 11111 is provided on the side plate 111, which avoids the data interface, and the data line of the acquisition circuit board can be conveniently connected to the data interface on the BMS module 4 through the electricity connection avoiding gap 11111.

[0055] In some possible embodiments, as shown in Figure 1 and Figure 2 The shell 11 can include two half shells 11a, each of which includes an end plate 112 and a bent plate connected to the end plate 112. In the state that the two half shells 11a are buckled, an electric core cavity is formed between the two half shells 11a, the bent plates of the two half shells 11a are spliced to form a side plate 111, and a gap 113 is formed between the bent plates of the two half shells 11a, and the BMS module 4 covers part of the gap 113.

[0056] The shell 11 is provided with two half shells 11a, which can facilitate the installation of each cylindrical electric core 12. The bent plates of the two half shells 11a are small in size, and the baffle 1111 can be arranged on the bent plates of the two half shells 11a to accommodate the installation of the BMS module 4. Part of the baffle 1111 is located on the bent plate of one half shell 11a, and the other part of the baffle 1111 is located on the bent plate of the other half shell 11a. When the two half shells 11a are connected, the baffles 1111 on the bent plates of the two half shells 11a are spliced to form a complete mounting groove 1112.

[0057] In some possible embodiments, as shown in Figure 1 The first acquisition circuit board 2 and the second acquisition circuit board 3 both have a gap with the circumferential side edge of the electric core assembly 1. Compared with the process of arranging the acquisition circuit board on the bottom of the electric core assembly 1, the first acquisition circuit board 2 and the second acquisition circuit board 3 provided in the embodiments of the present disclosure are both located at the middle position of the corresponding end plate 112, and have a gap with the process top and the process bottom of the cylindrical battery module 100, which improves the waterproof performance of the cylindrical battery module 100 and improves the situation that the acquisition circuit fails when water accumulates at the bottom.

[0058] In some possible embodiments, the first acquisition circuit board 2 and the second acquisition circuit board 3 are both flexible circuit boards. Compared with rigid circuit boards, the flexible circuit boards used in the embodiments of the present disclosure are lighter in weight, lower in cost, have the functions of buffering and absorbing vibration, are less likely to crack and disconnect, have high reliability, and have long service life. The flexible circuit board can be a FDC flexible circuit board (Flexible Die-cutting Circuit), i.e., a flexible die-cutting circuit board, such as an acquisition circuit board made of FR4 material.

[0059] The end plate 112 of the shell 11 can be provided with a plurality of aluminum bars 5, the aluminum bars 5 can connect the cylindrical battery cells 12, and the acquisition circuit board can be connected to the aluminum bars 5, so as to acquire the voltage, temperature and other signals of the cylindrical battery cells 12.

[0060] Figure 3 FIG. 1 shows a structural schematic diagram of a battery pack provided by an embodiment of the present disclosure, Figure 4 FIG. 2 shows a structural schematic diagram of a battery pack provided by an embodiment of the present disclosure, which hides the middle barrel and the shell. The battery pack provided by the embodiment of the present disclosure includes an outer shell 200 and the cylindrical battery module 100 described above, and the outer shell 200 has a cavity, and the cylindrical battery module 100 is accommodated in the cavity.

[0061] The battery pack provided by the embodiment of the present disclosure adopts the cylindrical battery module 100 described above, and thus has the same beneficial effects.

[0062] In some possible embodiments, as shown in FIGS. 1 and 2, Figure 3 and Figure 4 As shown in FIGS. 1 and 2, the outer shell 200 has a bottom cover 210, a middle barrel 220 and a top cover 230, the middle barrel 220 has a cavity and a top opening and a bottom opening communicating with the cavity, the top cover 230 is connected to the middle barrel 220 to close the top opening, and the bottom cover 210 is connected to the middle barrel 220 to close the bottom opening. The first acquisition circuit board 2, the second acquisition circuit board 3 and the BMS module 4 are located between the battery cell assembly 1 and the middle barrel 220, and the arrangement direction of the first acquisition circuit board 2 and the second acquisition circuit board 3 is perpendicular to the arrangement direction of the bottom cover 210 and the top cover 230.

[0063] It can be seen from the cooperation structure of the cylindrical battery module 100 and the shell 200 that the battery cells of the cylindrical battery module 100 of the present application are transversely stacked. Compared with arranging the cylindrical battery cells 12 vertically, the cylindrical battery cells 12 are transversely stacked in the present application, so that the height of the entire battery cell assembly 1 can be freely adjusted, the height of the battery cell assembly 1 can be increased, and the periphery of the battery cell assembly 1 has sufficient space to arrange the BMS module 4. Meanwhile, the first acquisition circuit board 2 and the second acquisition circuit board 3 are located on the two sides of the cylindrical battery module 100 along the horizontal direction, and are close to the BMS module 4, which facilitates the lead wires of the two acquisition circuit boards, reduces the wiring path of the acquisition circuit board and the BMS module 4, facilitates the fixation of the data line, and improves the space utilization.

[0064] The above description has been given for the purpose of illustration and description. Furthermore, this description does not intend to limit the embodiments of the present disclosure to the forms disclosed herein. Although a plurality of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A cylindrical battery module, characterized by, The application relates to a cylindrical battery module. The cylindrical battery module comprises: a plurality of cylindrical battery cells; a first collecting circuit board and a second collecting circuit board, which are arranged on opposite sides of the battery cell assembly and are perpendicular to the cylindrical battery cells, and are electrically connected to the cylindrical battery cells; 2. The cylindrical battery module according to claim 1, characterized by, a BMS module, which is arranged on the battery cell assembly on a side in the radial direction of the cylindrical battery cells and is electrically connected to the first collecting circuit board and the second collecting circuit board. The battery cell assembly comprises a shell; the shell has a battery cell cavity, and the cylindrical battery cells are arranged in the battery cell cavity; the shell has a side plate and two end plates, and the two end plates are arranged at the two ends of each cylindrical battery cell along the length direction; the side plate is parallel to the cylindrical battery cells, and the side plate connects the two end plates; 3. The cylindrical battery module according to claim 2, characterized by the first collecting circuit board and the second collecting circuit board are arranged on the two end plates, and the BMS module is arranged on the side plate. The BMS module has a first data interface and a second data interface; the first data interface is arranged on the side of the BMS module close to one end plate, and the second data interface is arranged on the side of the BMS module close to the other end plate; 4. The cylindrical battery module according to claim 2, characterized by, the first data interface is used for being connected to the first collecting circuit board through a data line, and the second data interface is used for being connected to the second collecting circuit board through a data line.

5. The cylindrical battery module according to claim 4, characterized by The side plate of the shell is provided with a mounting groove, and the BMS module is embedded and mounted in the mounting groove. The side plate of the shell is provided with a baffle, and the baffle forms a mounting groove; 6. The cylindrical battery module according to claim 2, characterized by the baffle is provided with an electricity connection avoiding gap. The shell comprises two half shells, and the half shells comprise the end plates and the bent plates connecting the end plates; in the state that the two half shells are buckled, the battery cell cavity is formed between the two half shells, the bent plates of the two half shells are spliced to form the side plate, and the gap is formed between the bent plates of the two half shells; 7. The cylindrical battery module according to any one of claims 1 to 6, wherein the BMS module covers part of the gap.

8. The cylindrical battery module according to any one of claims 1 to 6, wherein The first collecting circuit board and the second collecting circuit board are both provided with a gap with the circumferential edge of the battery cell assembly.

9. A battery pack, characterized by, The first collecting circuit board and the second collecting circuit board are both flexible circuit boards. The application relates to a cylindrical battery module. The cylindrical battery module comprises:

10. The battery pack of claim 9, wherein, a shell having a cavity; the cylindrical battery module is arranged in the cavity. The shell has a bottom cover, a middle barrel and a top cover; the middle barrel has the cavity and a top opening and a bottom opening communicating with the cavity; the top cover is connected to the middle barrel to close the top opening, and the bottom cover is connected to the middle barrel to close the bottom opening; the first collecting circuit board, the second collecting circuit board and the BMS module are arranged between the battery cell assembly and the middle barrel, and the arrangement direction of the first collecting circuit board and the second collecting circuit board is perpendicular to the arrangement direction of the bottom cover and the top cover.

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