Cylindrical battery module and battery pack

Abstract

The application discloses a cylindrical battery module and a battery pack, comprising: a battery module body, two bus bars and a cooling plate. The battery module body comprises a plurality of cylindrical battery cells, two bus bars are arranged on both sides of each cylindrical battery cell, a plurality of electric connection pieces are arranged on the bus bar, each electric connection piece connects each cylindrical battery cell, and the cooling plate has a cooling channel. Each electric connection piece on the bus bar is attached to the area of the cooling plate provided with the cooling channel. The cylindrical battery module of the application can achieve the effect of cooling the battery module by directly or indirectly contacting and exchanging heat between the cooling plate and the electric connection piece. In the application, each electric connection piece is attached to the area of the cooling plate provided with the cooling channel, which significantly improves the cooling efficiency of the battery module.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, and in particular to a cylindrical battery module and battery pack. Background Technology

[0002] Existing three-dimensional cylindrical battery cell modules include multiple layers of cylindrical cells. These modules typically employ serpentine cooling plates between adjacent cell layers to cool each layer. These serpentine cooling plates are attached to the upper or lower side of the corresponding layer of cylindrical cells to provide cooling. Because they are in contact with the outer circumference of the cylindrical cells, their cooling effect is significant. However, due to the numerous bends in their serpentine shape, the manufacturing process of these cooling plates is complex, making it difficult to achieve the required assembly standards. This results in a low yield rate, difficulties in small-batch production, and high production costs. Utility Model Content

[0003] To solve one of the above-mentioned technical problems, this utility model provides a cylindrical battery module and battery pack.

[0004] The present invention adopts the following technical solution:

[0005] The primary objective of this application is to provide a cylindrical battery module, comprising:

[0006] The battery module body includes multiple cylindrical cells;

[0007] Two busbars are provided on both sides of each cylindrical battery cell. Multiple electrical connectors are provided on each busbar, and each electrical connector connects each cylindrical battery cell.

[0008] A cooling plate having cooling channels, wherein each electrical connector on the busbar is attached to the area of ​​the cooling plate where the cooling channels are provided.

[0009] Optionally, the cylindrical battery module includes multiple heat-conducting sheets, each of which is attached to a corresponding electrical connector, and each of the heat-conducting sheets is attached to the area where the cooling channel is provided on the cooling plate.

[0010] Optionally, the cooling channel bends and extends multiple times to pass sequentially through the areas where each of the heat-conducting sheets is installed.

[0011] Optionally, a portion of the cooling channel is provided with several parallel channels, each of which extends through the area where different heat-conducting sheets are installed.

[0012] Optionally, the cooling channel includes multiple straight sections and multiple connecting sections;

[0013] Some straight sections are parallel, and some straight sections are located on the same straight line. Each straight section extends through the area where several heat-conducting plates are installed.

[0014] Each connecting segment connects two straight segments to connect all the straight segments;

[0015] Each of the heat-conducting sheets extends along a corresponding straight section.

[0016] Optionally, a first connection hole is provided on the busbar;

[0017] A second connection hole is provided on the cooling plate;

[0018] One end of the fastener passes through the second connecting hole and is connected to the first connecting hole, while the other end of the fastener is confined to the cooling plate.

[0019] Optionally, the cylindrical battery module includes an end case;

[0020] The two sides of the end shell are respectively connected to the corresponding busbars;

[0021] The cylindrical battery module has BMS slave boards on opposite sides, and the BMS slave boards are connected to the end shell.

[0022] A second objective of this application is to provide a battery pack, comprising:

[0023] The housing has a cavity;

[0024] Multiple cylindrical battery modules as described above are disposed within the cavity, and the cylindrical battery modules are arranged sequentially.

[0025] Optionally, the battery pack includes high-voltage components;

[0026] The enclosure includes a bottom enclosure and a top cover;

[0027] The bottom box has the cavity and an upper opening communicating with the cavity;

[0028] The upper cover is connected to the bottom box, and the upper cover closes the upper opening;

[0029] The high-voltage component is located between each cylindrical battery module and the top cover, and the high-voltage component is electrically connected to each of the cylindrical battery modules.

[0030] Optionally, the bottom box has a bottom plate, two high side plates and two low side plates;

[0031] The two lower side plates are respectively disposed on both sides of the bottom plate along the first direction;

[0032] The two high side plates are respectively disposed on both sides of the base plate along the second direction;

[0033] The high side plate, low side plate, and bottom plate enclose and form the cavity;

[0034] A connector assembly is provided on the side of the high side plate opposite to the bottom plate, and the connector assembly is electrically connected to the high voltage component.

[0035] By adopting the above technical solution, this application has the following beneficial effects:

[0036] The cylindrical battery module of this application achieves the effect of cooling the battery module by directly or indirectly exchanging heat between the cooling plate and the electrical connecting piece. In addition, in this application, each electrical connecting piece is attached to the area where the cooling channel is set on the cooling plate, which significantly improves the cooling efficiency of the battery module.

[0037] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0038] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0039] Figure 1 This is a schematic diagram of the external structure of the battery pack provided in an embodiment of this application;

[0040] Figure 2 This is a schematic diagram of the internal structure of the battery pack after the hidden top cover is provided in an embodiment of this application;

[0041] Figure 3 This is a schematic diagram of the structure of each cylindrical battery module inside the battery pack provided in the embodiments of this application;

[0042] Figure 4 A schematic diagram of the structure of a single cylindrical battery module of the battery pack provided in the embodiments of this application;

[0043] Figure 5 Another structural schematic diagram of a single cylindrical battery module of the battery pack provided in the embodiments of this application;

[0044] Figure 6 This is a cross-sectional view of a partial structure of a cylindrical battery module provided in an embodiment of this application;

[0045] Figure 7 An exploded view of the battery pack provided in an embodiment of this application;

[0046] Figure 8 This is a diagram showing the state of the cylindrical battery module after the cooling plate is hidden, as provided in an embodiment of this application.

[0047] In the diagram: 100, Cylindrical battery module; 1, Battery module body; 2, Busbar; 21, First connection hole; 3, Cooling plate; 31, Cooling channel; 311, Parallel channel; 31a, Straight section; 31b, Connection section; 32, Second connection hole; 4, Heat-conducting plate; 5, End shell; 6, BMS slave board; 200, Housing; 210, Bottom housing; 211, Bottom plate; 212, High side plate; 213, Low side plate; 220, Top cover; 300, High voltage assembly; 400, Connector assembly; 500, Water pipe; 600, Bolt; 700, Top cover pressure strip; 800, Sealing gasket; 900, Buffer pad; 1000, BMS main board; a, Fastener.

[0048] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0050] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0051] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0052] See Figure 5 and Figure 8As shown, this application embodiment provides a cylindrical battery module 100, including: a battery module body 1, two busbars 2, and a cooling plate 3. The battery module body 1 includes multiple cylindrical cells, and the two busbars 2 are respectively disposed on both sides of each cylindrical cell. Multiple electrical connecting pieces are disposed on the busbars 2, and each electrical connecting piece connects the cylindrical cells. The cooling plate 3 has a cooling channel 31, and each electrical connecting piece on the busbar 2 is attached to the area of ​​the cooling plate 3 where the cooling channel 31 is disposed.

[0053] The battery module body 1 of this application has cooling plates 3 on both sides. The axis of each cylindrical cell in the battery module body 1 is perpendicular to the cooling plate 3. The ends (such as terminals) of the cylindrical cells along the length direction make heat exchange contact with the cooling plate 3, which can achieve the effect of cooling the battery module. The cooling plate 3 of this application is a flat plate, which is simple in structure, simple in manufacturing process, high in yield, and low in production cost compared to non-serpentine plates.

[0054] The electrical connector can be a metal conductor, such as an aluminum alloy. The cylindrical battery module 100 of this application achieves heat exchange by directly or indirectly contacting the cooling plate 3 and the electrical connector, thereby cooling the battery module. In this application, each electrical connector is attached to the area of ​​the cooling plate 3 where the cooling channel 31 is provided, which significantly improves the cooling efficiency of the battery module.

[0055] In some possible implementation schemes, combined Figure 8 and Figure 5 As shown, the cylindrical battery module 100 includes a plurality of heat-conducting sheets 4, each of which is attached to a corresponding electrical connector, and each of which is attached to the area where the cooling channel 31 is provided on the cooling plate 3.

[0056] The area where the cooling channel 31 is set on the cooling plate 3 is the lowest temperature position on the cooling plate 3. By designing the heat-conducting sheet 4 to be attached to the area where the cooling channel 31 is set on the cooling plate 3, the heat exchange efficiency can be significantly improved, and the heat dissipation performance of the battery module can be improved.

[0057] The heat-conducting sheet 4 can be made of thermally conductive silicone or other flexible materials with good thermal conductivity. The electrical connector is a thin sheet, and the heat-conducting sheet 4 can be smoothly attached to the electrical connector. The heat-conducting sheet 4 is a flexible sheet. When the cooling plate 3 and the busbar 2 are separated, the heat-conducting sheet 4 protrudes from the busbar 2 (referring to the insulating plate on which the electrical connector is mounted) along the thickness direction. When the cooling plate 3 is connected to the busbar 2, the surfaces of the heat-conducting sheet 4 and the cooling plate 3 are pressed together, and the heat-conducting sheet 4 is in a compressed state. The two sides of the heat-conducting sheet 4 along the thickness direction respectively abut against the cooling plate 3 and the electrical connector. The heat-conducting sheet 4 is a flexible sheet with a certain thickness. The flexible sheet has a certain compressibility. When the cooling plate 3 is connected to the frame, the heat-conducting sheet 4 is compressed. The heat-conducting sheet 4 has the function of heat conduction and tolerance gap absorption, so that each electrical connector can indirectly and effectively contact the cooling plate 3 through the heat-conducting sheet 4, ensuring that each electrical connector can effectively exchange heat with the cooling plate 3.

[0058] In some possible implementations, the cooling channel 31 extends in multiple bends to pass sequentially through the areas where the heat-conducting plates 4 are disposed.

[0059] In this application, the cooling channel 31 extends through multiple bends, passing sequentially through the locations of each heat-conducting plate 4, thereby enabling all cylindrical cells to be effectively cooled.

[0060] See some possible implementations. Figure 5 As shown, a portion of the cooling channel 31 of the cooling plate is provided with several parallel channels 311, and each of the parallel channels 311 extends through different areas where the heat-conducting plates 4 are installed.

[0061] In order to ensure that the cooling channel 31 passes through all electrical connectors, some channel sections can be set as parallel channels 311 to form several branches, so that all electrical connectors can effectively contact the location where the cooling channel 31 is set on the cooling plate 3.

[0062] See some possible implementations. Figure 5 As shown, the cooling channel 31 includes multiple straight sections 31a and multiple connecting sections 31b. Some of the straight sections 31a are parallel, and some of the straight sections 31a are located on the same straight line. Each straight section 31a extends through the area where a number of heat-conducting plates 4 are installed. Each connecting section 31b connects two straight sections 31a to connect the straight sections 31a. Each heat-conducting plate 4 extends along the corresponding straight section 31a.

[0063] The heat-conducting plate 4 extends along the straight section 31a of the cold zone channel, which is beneficial for the heat-conducting plate 4 to fully contact the area where the straight section 31a is set on the cooling plate 3. The connecting section 31b can extend along a curve or oblique line, has an irregular shape, and is relatively short, making it unsuitable for matching with electrical connectors.

[0064] In some possible implementations, such as Figure 6 As shown, a first connecting hole 21 is provided on the busbar 2, and a second connecting hole 32 is provided on the cooling plate 3. One end of the fastener a passes through the second connecting hole 32 and is connected to the first connecting hole 21, while the other end of the fastener a is confined to the cooling plate 3. The fastener a can be a bolt, and the first connecting hole 21 can have internal threads. The cooling plate 3 is fastened to the battery module body 1 by bolts 600, so that the structural components in the cylindrical battery module 100 can be pre-assembled into an integrated structure and then uniformly assembled into the battery pack housing 200, simplifying the assembly process and improving assembly efficiency.

[0065] See Figures 1 to 8 As shown in the illustration, this application also provides a battery pack, including: a housing 200 and a plurality of the aforementioned cylindrical battery modules 100. The housing 200 has a cavity, and each cylindrical battery module 100 is disposed within the cavity, and the cylindrical battery modules 100 are arranged sequentially. The cylindrical battery modules 100 within the battery pack can be connected via water pipes 500, which can connect to the cooling plates 3 of each cylindrical battery module 100.

[0066] In this embodiment, the structural components of the cylindrical battery module 100, such as the battery module body 1, the busbar 2, and the cooling plate 3, are pre-assembled into a whole. Therefore, they can be directly assembled into the cavity of the housing 200 without the need for adjacent battery modules to press and fix the cooling plate 3, which reduces the assembly process and significantly improves the assembly efficiency.

[0067] like Figure 7 As shown, a buffer pad 900 can be installed at the bottom of the housing 200, and the battery module can be supported on the buffer pad 900.

[0068] See some possible implementations. Figure 3 As shown, the cylindrical battery module 100 includes an end shell 5, with each side of the end shell 5 connected to a corresponding busbar 2. A BMS slave board 6 is provided on each opposite side of the cylindrical battery module 100, and the BMS slave board 6 is connected to the end shell 5.

[0069] BMS slave board 6 is used to collect signals from the battery module, such as temperature and voltage signals. In this embodiment, two BMS slave boards 6 can be set on a cylindrical battery module 100, which allows more cylindrical cells to be set in the cylindrical battery module 100, which helps to achieve a compact design.

[0070] See Figure 1 , Figure 2 and Figure 3 As shown, the battery pack includes a high-voltage assembly 300. The housing 200 includes a bottom housing 210 and a top cover 220. The bottom housing 210 has the cavity and an upper opening communicating with the cavity. The top cover 220 is connected to the bottom housing 210 and closes the upper opening. The high-voltage assembly 300 is located between each cylindrical battery module 100 and the top cover 220, and the high-voltage assembly 300 is electrically connected to each cylindrical battery module 100. The cylindrical battery module 100 of this application has a compact structure, and the high-voltage assembly 300 is arranged on the top of each cylindrical battery module 100, making full use of the internal space of the battery pack. The cylindrical battery module 100 may also include a BMS motherboard 1000, which can be disposed between the cylindrical battery module 100 and the top cover 220, thereby making full use of the internal space of the battery pack and achieving a compact design.

[0071] See some possible implementations. Figure 2 As shown, the base housing 210 has a base plate 211, two high side plates 212, and two low side plates 213. The two low side plates are respectively disposed on both sides of the base plate 211 along a first direction, and the two high side plates 212 are respectively disposed on both sides of the base plate 211 along a second direction. The high side plates 212, low side plates 213, and base plate 211 enclose the cavity, wherein the first direction and the second direction are perpendicular to each other. A connector assembly 400 is provided on the side of the high side plate 212 opposite to the base plate 211, and the connector assembly 400 is electrically connected to the high voltage assembly 300. The connector assembly 400 can be multiple connection ports (or sockets). Compared with the panel that integrates each connector assembly 400 on the top cover 220, which has the problems of difficult assembly and messy cable arrangement, the embodiment of this application opens holes in the high side plate 212 to install each socket of the connector assembly 400, which meets the requirement of high installation height of the connector assembly 400, simplifies the assembly process of the connector assembly 400, and improves the assembly efficiency.

[0072] It should be noted that the connector assembly 400 is a mature and conventional structural component in the field. This application does not improve the structure of the connector assembly 400, but only adjusts the installation position of the connector assembly 400.

[0073] See Figure 7As shown, a sealing gasket 800 can be provided between the top opening of the upper cover 220 and the bottom box 210 to seal the gap between them. An upper cover pressure strip 700 can be provided along the edge of the upper cover 220 to increase the structural strength of the upper cover 220 and reduce deformation. The upper cover 220 and the bottom box 210 can be connected and fixed together using fasteners.

[0074] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A cylindrical battery module, characterized in that, include: The battery module body includes multiple cylindrical cells; Two busbars are provided on both sides of each cylindrical battery cell. Multiple electrical connectors are provided on each busbar, and each electrical connector connects each cylindrical battery cell. A cooling plate having cooling channels, wherein each electrical connector on the busbar is attached to the area of ​​the cooling plate where the cooling channels are provided.

2. The cylindrical battery module according to claim 1, characterized in that, It includes multiple heat-conducting sheets, each of which is attached to a corresponding electrical connector, and each of the heat-conducting sheets is attached to the area where the cooling channel is set on the cooling plate.

3. The cylindrical battery module according to claim 2, characterized in that, The cooling channel bends and extends multiple times to pass sequentially through the areas where the heat-conducting plates are installed.

4. The cylindrical battery module according to claim 2, characterized in that, The cooling channel has several parallel channels in some sections, and each parallel channel extends through the area where different heat-conducting plates are installed.

5. The cylindrical battery module according to claim 2, characterized in that, The cooling channel includes multiple straight sections and multiple connecting sections; Some straight sections are parallel, and some straight sections are located on the same straight line. Each straight section extends through the area where several heat-conducting plates are installed. Each connecting segment connects two straight segments to connect all the straight segments; Each of the heat-conducting sheets extends along a corresponding straight section.

6. The cylindrical battery module according to claim 1, characterized in that, The busbar is provided with a first connection hole; A second connection hole is provided on the cooling plate; One end of the fastener passes through the second connecting hole and is connected to the first connecting hole, while the other end of the fastener is confined to the cooling plate.

7. The cylindrical battery module according to claim 6, characterized in that, Including end shells; The two sides of the end shell are respectively connected to the corresponding busbars; The cylindrical battery module has BMS slave boards on opposite sides, and the BMS slave boards are connected to the end shell.

8. A battery pack, characterized in that, include: The housing has a cavity; Multiple cylindrical battery modules as described in any one of claims 1-7, wherein each cylindrical battery module is disposed within the cavity, and the cylindrical battery modules are arranged sequentially.

9. The battery pack according to claim 8, characterized in that, Including high-voltage components; The enclosure includes a bottom enclosure and a top cover; The bottom box has the cavity and an upper opening communicating with the cavity; The upper cover is connected to the bottom box, and the upper cover closes the upper opening; The high-voltage component is located between each cylindrical battery module and the top cover, and the high-voltage component is electrically connected to each of the cylindrical battery modules.

10. The battery pack according to claim 9, characterized in that, The bottom box has a bottom plate, two high side plates and two low side plates; The two lower side plates are respectively disposed on both sides of the bottom plate along the first direction; The two high side plates are respectively disposed on both sides of the base plate along the second direction; The high side plate, low side plate, and bottom plate enclose and form the cavity; A connector assembly is provided on the side of the high side plate opposite to the bottom plate, and the connector assembly is electrically connected to the high voltage component.

Images