Liquid-cooled battery module

Abstract

The utility model discloses a liquid-cooled battery module which comprises a liquid-cooled pipeline and a plurality of battery cells, the middle part of each battery cell is provided with a cavity penetrating through the two ends of the battery cell, and the two ends of each battery cell are respectively provided with a quick plug communicated with the cavity. The liquid cooling pipeline comprises a liquid inlet pipe row and a liquid outlet pipe row, the liquid inlet pipe row is communicated with the cavity of each battery cell through a quick plug positioned at the same end, and the liquid outlet pipe row is communicated with the cavity of each battery cell through a quick plug positioned at the other end, so that cooling liquid flows through the cavities in the middle of all the battery cells in a parallel connection manner. According to the liquid-cooled battery module, the liquid-cooled pipeline is communicated with the cavity, so that the cooling liquid can directly circulate in all the battery cells, the heat dissipation problem in the battery cells is solved, the temperature difference in the liquid-cooled battery module is smaller, the heat dissipation efficiency is improved, the overall performance of the battery module is improved, and the service life of the battery module is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a liquid-cooled battery module. Background Art

[0002] As the main power source for new energy vehicles, power batteries have been increasing in energy density as the requirements for the range of new energy vehicles continue to increase. In order to prevent chain explosions caused by thermal runaway of single cells, air cooling and liquid cooling are usually used to dissipate heat from the battery module. The cooling effect of air cooling is low, and the heat dissipation effect is limited, which cannot meet the heat dissipation requirements of current power batteries. Liquid cooling has higher heat dissipation efficiency than air cooling, and can meet the heat dissipation requirements of high-power charging and discharging. At the same time, liquid cooling dissipates heat more evenly. The commonly used liquid cooling heat dissipation device is to set a liquid cooling plate at the bottom or side of the battery module to cool the battery cell, but because only one side is in contact with the battery module, it is impossible to cool the inside of the battery cell, the cooling efficiency is insufficient, and the heat dissipation effect is uneven. In addition, the expansion problem of the battery cell after long-term use will squeeze the liquid cooling plate, affecting the heat dissipation effect.

[0003] Therefore, it is currently necessary to develop a new technology to solve the problems of low heat dissipation efficiency and uneven heat dissipation in existing battery module heat dissipation technology, reduce the safety risks of battery module use, and improve the overall performance and service life of the battery module. Utility Model Content

[0004] The utility model aims at the problems in the prior art and discloses a liquid-cooled battery module, which can effectively cool the battery module, solve the heat dissipation problem inside the battery core, and achieve temperature uniformity of each battery core in the battery module.

[0005] The utility model embodiment provides a liquid-cooled battery module, including a liquid-cooling pipe and a plurality of battery cells, each of which has a cavity in the middle that passes through both ends of the battery cell, and each of which has quick plugs connected to the cavity at both ends.

[0006] The liquid cooling pipeline includes an inlet pipe row and an outlet pipe row. The inlet pipe row is connected to the cavity of each battery cell through a quick plug located at the same end, and the outlet pipe row is connected to the cavity of each battery cell through a quick plug located at the other end. The quick plug is matched with the cavity through an interface so that the coolant flows through the cavities inside all battery cells in parallel.

[0007] The liquid inlet pipe row and the liquid outlet pipe row of the liquid cooling pipe are each independently provided with a plurality of mutually parallel branch pipes and at least one main pipe connecting the branch pipes, and the branch pipes are provided with pipe joints that can be matched and connected with the quick plugs on the battery cells.

[0008] Specifically, the liquid inlet pipe row includes a main liquid inlet pipe and a plurality of branch liquid inlet pipes, and the branch liquid inlet pipes are provided with a plurality of pipe joints, and the pipe joints are matched and connected with the quick plugs on the battery core.

[0009] The main liquid inlet pipeline is arranged horizontally or vertically, the branch liquid inlet pipelines are arranged in parallel and arranged in a direction perpendicular to the main liquid inlet pipeline, and the branch liquid inlet pipelines are connected to the main liquid inlet pipeline through a pipeline connector.

[0010] The liquid outlet pipe row includes a main liquid outlet pipe and a plurality of branch liquid outlet pipes. The branch liquid outlet pipes are provided with a plurality of pipe joints, and the pipe joints are matched and connected with the quick plugs on the battery core.

[0011] The main liquid outlet pipe is arranged horizontally or vertically, the branch liquid outlet pipes are arranged in parallel and arranged in a direction perpendicular to the main liquid outlet pipe, and the branch liquid outlet pipes are connected to the main liquid outlet pipe through a pipe connector.

[0012] The pipeline connecting piece is a tee.

[0013] The cells are arranged in parallel in the horizontal and vertical directions and are located in the module frame. A plurality of frame slots arranged in parallel in the horizontal or vertical directions are provided in the module frame, and a group of cells are arranged in parallel in each of the frame slots.

[0014] Module covers are respectively provided on both sides of the module frame, including a first module cover and a second module cover, to further confine the battery cell in the module frame.

[0015] The module frame is an aluminum mesh module frame.

[0016] The first module cover plate and the second module cover plate are made of aluminum.

[0017] Aluminum row assemblies are also provided on both sides of the module frame to realize series / parallel connection of the battery cells in the circuit, and the aluminum row assemblies are respectively arranged between the module frame and the module cover plate. Specifically, the battery cells are connected in series / parallel through the first aluminum row assembly and the second aluminum row assembly.

[0018] A module insulating member is disposed inside the module cover plate, and a plurality of openings are disposed on the module insulating member. The aluminum row assembly located on the same side of the module frame can be embedded in the openings of the module insulating member and tightly combined with the module insulating member.

[0019] Specifically, a first module insulating member is provided on the inner side of the first module cover plate, the first module insulating member is provided with a plurality of openings, and the first aluminum bar assembly is embedded in the openings and is tightly combined with the first module insulating member.

[0020] A second module insulating member is disposed on the inner side of the second module cover plate. The second module insulating member is provided with a plurality of openings. The second aluminum row assembly is embedded in the openings and is tightly combined with the second module insulating member.

[0021] The module insulating member and the module cover plate are also provided with holes for the quick plug to pass through.

[0022] Specifically, the quick plug at one end of the battery core passes through the first module insulating member and the openings on the first module cover plate to be connected to the pipe joint on the branch liquid inlet pipe.

[0023] The quick plug at the other end of the battery core passes through the second module insulating member and the opening on the second module cover plate and is connected to the pipeline joint on the branch liquid outlet pipeline.

[0024] The liquid-cooled battery module also includes a sampling component, which is an FPC flexible circuit board fixedly connected to the module insulation component. The FPC flexible circuit board can be twisted, bent, folded, and can also quickly transmit electrical signals to enable the liquid-cooled battery module to operate well.

[0025] The characteristics and beneficial effects of the utility model are:

[0026] The present application provides a liquid-cooled battery module, in which the battery cells in the module all have internal cavities, and the liquid inlet and outlet pipes are connected respectively through quick plugs at both ends of the battery cells. Compared with traditional liquid cooling heat dissipation devices, the present application omits the liquid cooling plate at the bottom or side of the battery module, thereby improving the energy density of the battery module, and the coolant directly flows inside the battery cell to further improve the heat dissipation efficiency and heat dissipation uniformity, thereby improving the overall safety and service life of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of an integrated device of a liquid-cooled battery module provided by the utility model;

[0029] Figure 2 A schematic diagram of a three-dimensional exploded structure of a liquid-cooled battery module provided by the utility model;

[0030] Figure 3 A schematic diagram of a module frame of a liquid-cooled battery module provided by the utility model;

[0031] Figure 4 A schematic diagram of the fixed position of the aluminum row of a liquid-cooled battery module provided by the utility model;

[0032] Figure 5 A schematic diagram of the fixing position of the aluminum row on the other side of a liquid-cooled battery module provided by the utility model;

[0033] Figure 6 A schematic diagram of a battery cell with a quick plug of a liquid-cooled battery module provided by the utility model;

[0034] Icons: 110-battery cell; 1101-cavity; 1102-quick plug; 1103-interface; 120-module frame; 1201-frame slot; 130-first module cover; 1301-; 140-second module cover; 1401-; 150-liquid inlet pipe row; 1501-main liquid inlet pipeline; 1502-branch liquid inlet pipeline; 160-liquid outlet pipe row; 1601-main liquid outlet pipeline; 1602-branch liquid inlet pipeline; 170-first module insulation; 180-second module insulation; 190-first aluminum row assembly; 200-second aluminum row assembly; 210-pipe joint; 220-pipe connector; 230-opening; 240-orifice. DETAILED DESCRIPTION

[0035] The embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. The same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limiting the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0037] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "setting" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In the description of this application, the terms "first" and "second" are only used to distinguish different objects and should not be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary and secondary relationship of the indicated technical features.

[0040] See also Figures 1 to 6 The embodiment of the utility model provides a liquid-cooled battery module, including a liquid-cooling pipe and a plurality of battery cells 110, each of the battery cells 110 has a cavity 1101 in the middle portion that passes through both ends of the battery cell 110, and each of the battery cells 110 has a quick plug 1102 that is connected to the cavity 1101 at both ends.

[0041] The liquid cooling pipeline includes a liquid inlet pipe row 150 and a liquid outlet pipe row 160. The liquid inlet pipe row 150 is connected to the cavity 1101 of each battery cell 110 through a quick plug 1102 located at the same end, and the liquid outlet pipe row 160 is connected to the cavity 1101 of each battery cell 110 through a quick plug 1102 located at the other end. The quick plug 1102 is matched and connected to the cavity 1101 through an interface 1103, so that the coolant flows through the cavity 1101 in the middle of all battery cells 110 in parallel.

[0042] Compared with the existing liquid-cooled battery module, the present application sets a cavity 1101 inside each battery cell 110, and sets a quick plug 1102 at both ends of each battery cell 110, connecting the liquid cooling pipe with the cavity 1101, so that the coolant can directly flow inside all battery cells 110, solving the heat dissipation problem inside the battery cell 110, making the temperature difference inside the liquid-cooled battery module smaller, and improving the heat dissipation efficiency.

[0043] The battery cell 110 with the internal cavity 1101 of the present application can be made by yourself or purchased. The internal cavity 1101 allows the coolant to directly pass through the center of the battery cell 110, or even directly pass through the battery cell. As an example, the patent application with publication number CN 117039262A discloses a feasible battery cell structure.

[0044] The liquid inlet pipe row 150 and the liquid outlet pipe row 160 of the liquid cooling pipe are each independently provided with a plurality of mutually parallel branch pipes and at least one main pipe connecting the branch pipes, and the branch pipes are provided with pipe connectors 210 that can match and connect with the quick plugs 1102 on the battery cells 110.

[0045] Specifically, the liquid inlet pipe row 150 includes a main liquid inlet pipe 1501 and a plurality of branch liquid inlet pipes 1502 . The branch liquid inlet pipes 1502 are provided with a plurality of pipe connectors 210 . The pipe connectors 210 are matched and connected with the quick plugs 1102 on the battery cell 110 .

[0046] The main liquid inlet pipeline 1501 is arranged horizontally or vertically, and the branch liquid inlet pipelines 1502 are arranged in parallel and arranged in a direction perpendicular to the main liquid inlet pipeline 1501. The branch liquid inlet pipelines 1502 are connected to the main liquid inlet pipeline 1501 through a pipeline connector 220. The embodiment provides a specific example of a liquid inlet pipeline, such as Figure 2 As shown, the main liquid inlet pipe 1501 is arranged horizontally, and the branch liquid inlet pipes 1502 are arranged in parallel and arranged vertically.

[0047] The liquid outlet pipe row 160 includes a main liquid outlet pipe 1601 and a plurality of branch liquid outlet pipes 1602 . The branch liquid outlet pipes 1602 are provided with a plurality of pipe connectors 210 . The pipe connectors 210 are matched and connected with the quick plugs 1102 on the battery cell 110 .

[0048] The main liquid outlet pipe 1601 is arranged horizontally or vertically, and the branch liquid outlet pipes 1602 are arranged in parallel and arranged in a direction perpendicular to the main liquid outlet pipe 1601. The branch liquid outlet pipes 1602 are connected to the main liquid outlet pipe 1601 through a pipe connector 220. The embodiment provides a specific example of a liquid outlet pipe, such as Figure 2 As shown, the main liquid outlet pipe 1501 is arranged horizontally, and the branch liquid outlet pipes 1502 are arranged in parallel and arranged vertically.

[0049] The pipe connector 220 is a tee.

[0050] In order to improve the energy density of the liquid-cooled battery module, the battery cells 110 are arranged in parallel horizontally and vertically and are confined in the module frame 120. The module frame 120 is provided with a plurality of frame grooves 1201 arranged in parallel horizontally or vertically, and a group of battery cells 110 are arranged in parallel in each frame groove 1201.

[0051] Grouping the battery cells 110 into groups and limiting their positions can save the internal space of the liquid-cooled battery module, improve the module energy density, and at the same time be more conducive to the stability of the module structure. The heat on the outer surface of the battery cell 110 can be dissipated through the contact surface with the frame groove 1201, thereby improving the heat dissipation efficiency of the liquid-cooled battery module. The frame groove 1201 can, to a certain extent, suppress the volume expansion of the battery cell 110 during the cyclic charge and discharge process, thereby improving the cyclic stability of the battery cell 110. At the same time, the frame groove 1201 is provided in the module frame 120, which makes it easy to assemble the battery cell 110.

[0052] Module covers are respectively disposed on both sides of the module frame 120 , including a first module cover 130 and a second module cover 140 , to further restrict the battery cell 110 in the module frame 120 .

[0053] The module frame 120 is an aluminum mesh module frame.

[0054] The first module cover plate 130 and the second module cover plate 140 are made of aluminum.

[0055] Aluminum bar assemblies are also provided on both sides of the module frame 120 to realize the series / parallel connection of the battery cells 110 in the circuit. The aluminum bar assemblies are respectively arranged between the module frame 120 and the module cover. Specifically, the battery cells 110 are connected in series / parallel through the first aluminum bar assembly 190 and the second aluminum bar assembly 200.

[0056] A module insulating member is disposed inside the module cover plate, and a plurality of openings 230 are disposed on the module insulating member. The aluminum row assembly located on the same side of the module frame 120 can be embedded in the openings 230 of the module insulating member and tightly combined with the module insulating member.

[0057] Specifically, a first module insulating member 170 is disposed inside the first module cover plate 130 . The first module insulating member 170 is provided with a plurality of openings 230 . The first aluminum bar assembly 190 is embedded in the openings 230 and is tightly combined with the first module insulating member 170 .

[0058] A second module insulating member 180 is disposed inside the second module cover plate 140 . The second module insulating member 180 is provided with a plurality of openings 230 . The second aluminum bar assembly 200 is embedded in the openings 230 and is tightly combined with the second module insulating member 180 .

[0059] The first aluminum bar assembly 190 and the second aluminum bar assembly 200 firstly conduct current in the liquid-cooled battery module to achieve current balance between the battery cells 110. The aluminum bar has good thermal conductivity, which can improve the heat dissipation effect of the outer surface of the battery cell 110, and at the same time improve the structural stability of the liquid-cooled battery module to prevent the battery from deforming and loosening. Tightly combining the aluminum bar assembly and the module insulation can prevent current leakage and short circuit in the liquid-cooled battery module, thereby improving the safety of the battery.

[0060] The module insulating member and the module cover are also provided with openings 240 for the quick plug 1102 to pass through.

[0061] The orifice 240 may preferably be configured to have a shape that matches the portion through which the quick plug 1102 passes, thereby facilitating stable positioning of the quick plug 1102 .

[0062] For details, see Figure 1 , 2 The quick plug 1102 at one end of the battery cell 110 passes through the first module insulating member 170 and the opening 240 on the first module cover 130 and is connected to the pipe joint 210 on the branch liquid inlet pipe 1502 .

[0063] The quick plug 1102 at the other end of the battery cell 110 passes through the second module insulating member 180 and the opening 240 on the second module cover plate 140 and is connected to the pipe joint 210 on the branch liquid outlet pipe 1602.

[0064] The liquid-cooled battery module also includes a sampling component, which is an FPC flexible circuit board (not shown in the figure) fixedly connected to the module insulation. The FPC flexible circuit board can be twisted, bent, folded, and can also quickly transmit electrical signals to enable the liquid-cooled battery module to operate well.

[0065] The assembly process of the liquid-cooled battery module is as follows: fasten the first module insulating member 170 to the module frame 120, then place the battery cell 110 into the module frame 120, then fasten the second module insulating member 180 to the module frame 120, seal the battery cells 110 in the corresponding frame grooves 1201, and then perform aluminum row laser welding on two adjacent battery cells 110. After welding, install the sampling assembly FPC, the first module cover plate 130, and the second module cover plate 140. Then install the quick plug 1102 on both sides of the battery cell 110, and finally connect the liquid cooling pipe to the quick plug 1102 to obtain the liquid-cooled battery module of the present application.

[0066] In summary, the liquid-cooled battery module provided by the utility model can effectively solve the heat dissipation problem of the battery cells in the battery module, ensure the temperature uniformity between the battery cells in the battery module, and improve the heat dissipation efficiency.

[0067] It should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid-cooled battery module, characterized in that: It comprises a liquid cooling pipe and a plurality of battery cells (110), wherein the middle of each battery cell (110) has a cavity (1101) penetrating through both ends of the battery cell (110), and both ends of each battery cell (110) are provided with a quick plug (1102) connected to the cavity (1101); The liquid cooling pipeline comprises a liquid inlet pipe row (150) and a liquid outlet pipe row (160); the liquid inlet pipe row (150) is connected to the cavity (1101) of each battery cell (110) via a quick plug (1102) located at the same end; the liquid outlet pipe row (160) is connected to the cavity (1101) of each battery cell (110) via a quick plug (1102) located at the other end; the quick plug (1102) is matched and connected to the cavity (1101) via an interface (1103), so that the cooling liquid flows through the cavities (1101) inside all the battery cells (110) in a parallel form.

2. A liquid-cooled battery module according to claim 1, characterized in that: The liquid inlet pipe row (150) and the liquid outlet pipe row (160) of the liquid cooling pipe are each independently provided with a plurality of mutually parallel branch pipes and at least one main pipe connecting the branch pipes, and the branch pipes are provided with pipe joints (210) that can be matched and connected with the quick plugs (1102) on the battery cells (110).

3. A liquid-cooled battery module according to claim 1, characterized in that: The liquid inlet pipe row (150) comprises a main liquid inlet pipe (1501) and a plurality of branch liquid inlet pipes (1502), the branch liquid inlet pipes (1502) are provided with a plurality of pipe joints (210), and the pipe joints (210) are matched and connected with the quick plugs (1102) on the battery cell (110); The liquid outlet pipe row (160) comprises a main liquid outlet pipe (1601) and a plurality of branch liquid outlet pipes (1602), and the branch liquid outlet pipes (1602) are provided with a plurality of pipe joints (210), and the pipe joints (210) are matched and connected with the quick plugs (1102) on the battery cell (110).

4. A liquid-cooled battery module according to claim 3, characterized in that: The main liquid inlet pipeline (1501) is arranged horizontally or vertically, the branch liquid inlet pipelines (1502) are arranged in parallel and arranged in a direction perpendicular to the main liquid inlet pipeline (1501), and the branch liquid inlet pipelines (1502) are connected to the main liquid inlet pipeline (1501) via a pipeline connector (220); The main liquid outlet pipe (1601) is arranged horizontally or vertically, and the branch liquid outlet pipes (1602) are arranged in parallel and arranged in a direction perpendicular to the main liquid outlet pipe (1601). The branch liquid outlet pipes (1602) are connected to the main liquid outlet pipe (1601) via a pipe connector (220).

5. The liquid-cooled battery module according to claim 1, characterized in that: The battery cells (110) are arranged in parallel in the horizontal and vertical directions and are located in a module frame (120). A plurality of frame grooves (1201) arranged in parallel in the horizontal or vertical directions are provided in the module frame (120), and a group of battery cells (110) are arranged in parallel in each of the frame grooves (1201).

6. A liquid-cooled battery module according to claim 5, characterized in that: Module covers are respectively provided on both sides of the module frame (120), including a first module cover (130) and a second module cover (140), which further restrict the battery cell (110) to be located in the module frame (120).

7. The liquid-cooled battery module according to claim 5, characterized in that: Aluminum row assemblies are also provided on both sides of the module frame (120) for realizing series / parallel connection of the battery cells (110) in the circuit, and the aluminum row assemblies are respectively arranged between the module frame (120) and the module cover plate.

8. The liquid-cooled battery module according to claim 6, characterized in that: A module insulating member is provided on the inner side of the module cover plate, and a plurality of openings (230) are provided on the module insulating member. The aluminum bar assembly located on the same side of the module frame (120) can be embedded in the openings (230) of the module insulating member and tightly combined with the module insulating member.

9. A liquid-cooled battery module according to claim 8, characterized in that: The module insulating member and the module cover are also provided with holes (240) for allowing a quick plug (1102) to pass through.

10. The liquid-cooled battery module according to claim 8, characterized in that: It also includes a sampling component, which is an FPC flexible circuit board and is fixedly connected to the module insulation component.

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