A wind-liquid integrated battery pack

Abstract

The present invention relates to the field of power battery manufacturing, and specifically to an air-liquid integrated battery pack, comprising a battery box, a battery module, a battery management unit, an air-cooling component and a liquid-cooling component, wherein the air-cooling component comprises a fan and foam, the battery modules are compressed by foam to form at least one independent air duct, and a fan is arranged inside or at both ends of each independent air duct; the liquid-cooling component comprises a water inlet pipe, a water return pipe and a heat exchanger, and the water inlet pipe and the water return pipe are externally connected to a liquid cold source or a liquid heat source obtained by vehicle-mounted heating or heat dissipation; the air-liquid integrated battery pack of the present invention is applied to the thermal management of cylindrical battery cells, adopts a fully enclosed design, and can effectively achieve IP67 waterproof and dustproof level; the ventilation duct is arranged inside the battery module, and the periphery of the battery module is fully enclosed, with high heat exchange efficiency and effective heat preservation, which can effectively reduce heat loss and reduce battery energy consumption.

Description

Technical Field

[0001] The invention relates to the field of power battery manufacturing, in particular to an air-liquid integrated battery pack. Background Art

[0002] As the environmental situation becomes increasingly severe, electric vehicles are increasingly recognized by everyone. Power batteries are an important part of the core power unit of electric vehicles. There are also many types of power batteries, such as 18650 cells, 26650 and other cylindrical cells, and the technical development route is very mature. In particular, the foreign company Tesla took the lead in using it in the field of electric vehicles, leading the storm of using cylindrical power cells in China. More and more car companies choose cylindrical cells with smaller size units as power batteries. Compared with square and soft-pack batteries, the more difficult thing about cylindrical cells is heat dissipation and heating management. The more mature solution at home and abroad is to use cold plates. For cylindrical cells, serpentine tubes need to be set and ensure that the serpentine tubes are in contact with each cell. In order to increase heat dissipation efficiency and reliability, it is necessary to reduce the joints of liquid cooling pipes, resulting in the size of a single battery module often being set large and a large number of busbars, which places high requirements on assembly accuracy and equipment. If the product volume is not large during the life cycle, the mold sharing cost will often be too high. In addition, the traditional air-cooled or liquid-cooled battery heat dissipation mode has low heat exchange efficiency, poor heat dissipation or heating effect, unstable battery temperature control, and the battery sealing effect cannot be guaranteed, and the waterproof and dust-sealing performance is poor. Therefore, it is particularly necessary to design a power battery pack that can overcome the above defects. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects described in the background technology, so as to realize an air-liquid integrated battery pack with a fully enclosed design, high heat exchange efficiency, stable and efficient battery temperature control, and relatively low assembly cost.

[0004] To achieve the above-mentioned invention object, the technical scheme of the present invention is: an air-liquid integrated battery pack, comprising a battery case, a battery module and a battery management unit, the battery case comprising a battery lower case and a battery case upper cover, the battery management unit being electrically connected to the battery module and used to control the operation of the battery module, the battery module being provided with battery cells connected in series or in parallel, the battery module being fixedly arranged on the battery lower case; further comprising an air-cooling component and a liquid-cooling component, the air-cooling component comprising a fan and foam, the foam being in a rectangular ring shape, the two sides of the foam being fixed with glue, the foam being made of flame-retardant material by foaming, and having blind foaming holes inside, the battery modules being compressed by at least one foam to form at least one independent air duct perpendicular to the direction of the battery cell, at least one independent air duct perpendicular to the direction of the battery cell being formed in the battery module, sealed return air hoods being fixedly arranged at both ends of the independent air duct of the battery module, the return air hood being made of plastic material, and the independent air duct isolated by the foam utilizing the return air hood The wind direction is changed, and finally the series or parallel connection between independent air ducts is realized; at least one fan is arranged inside or at both ends of each independent air duct, and a lateral ventilation design is adopted, that is, the battery module adopts an air duct design that is closed at the top and bottom, open at both sides, and the battery monomers are not connected in series; the liquid cooling component includes a water inlet pipe, a water return pipe and a heat exchanger, the heat exchanger is perpendicular to the independent air duct and is arranged inside or at both ends of the battery module, the water inlet pipe and the water return pipe are externally connected to a liquid cold source or a liquid heat source obtained by vehicle heating or heat dissipation, and the heat exchanger and the fan are integrated together or arranged in a dispersed manner; the wind formed by the fan of the air cooling component in the independent air duct of the battery module is forced to heat or cool the battery unit in the battery module after heat exchange through the heat exchanger of the liquid cooling component, the battery monomers of the battery module are arranged in a rectangular shape or a rhombus shape or a mixed rectangular and rhombus shape, and the gap distance between the battery monomers is set to 0.2mm-2mm. For the forced air cooling system, the design of the air duct is very critical. Good air duct design can not only improve the uniformity of heat dissipation, but also reduce the flow resistance of the system.

[0005] As a preferred technical solution of the present invention, the battery module includes a battery cell fixedly installed by a battery cell fixing frame, and multiple groups of battery cells are connected in series to form a battery module, bus bars are arranged at both ends of the battery module, current-carrying sheets are arranged on the inner side of the bus bars, copper sheets are sandwiched between adjacent battery cell groups, and insulating baffles are arranged at both ends of the battery module outside the bus bars, and the insulating baffles, bus bars, current-carrying sheets, battery cell fixing frame and copper sheets are connected by locking and fixing in series through through rods and fastening nuts, and gaskets are arranged on the through rods between the insulating baffles and the fastening nuts.

[0006] As a preferred technical solution of the present invention, when the battery modules are of an interval-separated structure due to limitations on the installation space of the battery pack, each independent air duct between the interval battery modules is sealed and connected to each other and is provided with an air duct for air to pass through, thereby ensuring that a closed air duct loop is formed inside the battery module, and the inner and outer walls of the air duct are wrapped with tin foil, and a skeleton support is provided inside the air duct.

[0007] As a preferred technical solution of the present invention, the fans in adjacent independent air ducts blow in opposite directions, so that the wind between the independent air ducts can be better circulated. For example, three air ducts are provided, with one fan in each air duct. The wind direction of the middle fan is opposite to that of the two sides, and the power of the middle fan is greater than that of the two sides, so that the air can convect better.

[0008] As a preferred technical solution of the present invention, an insulating plate is fixedly provided on the inner wall of the battery lower box and the battery box upper cover, and the material of the insulating plate is quartz or mica composite plate, so as to better insulate the inside of the battery pack and reduce heat loss.

[0009] Beneficial effects of the air-liquid integrated battery pack of the present invention:

[0010] 1. The air-liquid integrated battery pack of the present invention adopts a fully enclosed design. Compared with the traditional design of introducing air-conditioning air for heat dissipation, this solution can effectively achieve IP67 waterproof and dustproof level; the ventilation duct is arranged inside the battery module, and the battery module is fully enclosed around it, with high heat exchange efficiency and effective heat preservation, which can effectively reduce heat loss and reduce battery energy consumption.

[0011] 2. The air-liquid integrated battery pack of the present invention has an independent air duct that is perpendicular to the direction of the battery cell and adopts a lateral ventilation design. Compared with series ventilation, lateral ventilation has a larger ventilation cross-sectional area, simple air duct assembly, and effective space saving. The whole package is simple to assemble, has fewer types of accessories, strong versatility, and does not require high assembly technology, which can effectively reduce the cost of the product.

[0012] 3. In the air-liquid integrated battery pack of the present invention, the liquid cooling components are separated from the battery cells, and the liquid cooling components can be flexibly arranged at both ends or inside the battery module to avoid areas prone to collision. Compared with traditional liquid-cooled battery packs, the risk of pipeline collision and rupture can be reduced.

[0013] 4. The air-liquid integrated battery pack of the present invention provides a heat source or a cold source through a heat exchanger, realizes forced air cooling with the help of a fan, and adopts battery cell gap air cooling. Without reducing the flow resistance of the system, it can effectively utilize the existing space of the cylindrical module and will not reduce the battery pack volume energy density too much. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1is a schematic diagram of a three-dimensional exploded structure of an air-liquid integrated battery pack of Example 4;

[0015] Figure 2 is a schematic diagram of the planar structure of the air-liquid integrated battery pack of Example 4;

[0016] Figure 3 is a schematic structural diagram of a battery module of an air-liquid integrated battery pack of Example 4;

[0017] Figure 4 is a structural schematic diagram of a battery module of an air-liquid integrated battery pack of Example 4;

[0018] Figure 5 It is a schematic diagram of the independent air duct structure of the air-liquid integrated battery pack of the present invention;

[0019] Figure 6 It is a schematic diagram of the exploded structure of the battery module of the air-liquid integrated battery pack of the present invention;

[0020] Figure 7 It is a schematic diagram of the arrangement of battery cells in a battery module;

[0021] Figure 8 It is a schematic diagram of the installation position structure of the fan and heat exchanger on the battery module.

[0022] In the figure: 1-battery box, 101-battery lower box, 102-battery box upper cover, 2-battery module, 201-battery cell, 202-battery cell fixing frame, 203-bus, 204-current carrier, 205-copper sheet, 206-insulating baffle, 207-through rod, 208-fastening nut, 209-gasket, 3-battery management unit, 4-air cooling assembly, 401-fan, 402-foam, 5-liquid cooling assembly, 501-water inlet pipe, 502-return pipe, 503-heat exchanger, 6-independent air duct, 7-return air hood, 8-insulating plate, 9-air duct. DETAILED DESCRIPTION

[0023] The air-liquid integrated battery pack of the present invention is described in more detail below with reference to the accompanying drawings and through specific implementation methods.

[0024] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "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 the present invention 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 the present invention.

[0025] Embodiment 1:

[0026] The air-liquid integrated battery pack of the present invention comprises a battery box 1, a battery module 2 and a battery management unit 3. The battery box 1 comprises a battery lower box 101 and a battery box upper cover 102. The battery management unit 3 is electrically connected to the battery module 2 and is used to control the operation of the battery module. The battery module 2 is provided with battery cells 201 connected in series or in parallel. The battery module 2 is fixedly arranged on the battery lower box 101. The battery cells 201 of the battery module 2 are arranged in a rectangular shape. The battery cells 201 are arranged in a rectangular shape. The distance is 2mm; it also includes an air cooling component 4 and a liquid cooling component 5, the air cooling component 4 includes a fan 401 and a foam 402, the foam 402 is in a rectangular ring shape, the battery modules 2 are pressed by three foams 402 to form three independent air ducts 6 perpendicular to the direction of the battery monomer 201, and sealed return air covers 7 are fixedly provided at both ends of the independent air duct 6 of the battery module 2. The return air cover 7 is made of plastic material and can guide the wind at both ends of the independent air duct 6 of the battery module 2. The foam 402 isolates The independent air duct 6 uses the return air cover 7 to change the wind direction, and finally realizes the series or parallel connection between the independent air ducts 6. A fan 401 is arranged inside each independent air duct 6. The fans 401 in adjacent independent air ducts 6 blow in opposite directions, so that the wind between each independent air duct 6 can be better circulated. The middle fan 401 has an opposite wind direction to the wind on both sides, and the middle fan 401 has a larger power than the two sides, so that the air can convect better; the liquid cooling component 5 includes a water inlet pipe 501, a water return pipe 502 and a heat exchanger 5 03, the heat exchanger 503 is perpendicular to the independent air duct 6 and is arranged inside the battery module 2, the heat exchanger 503 and the fan 401 are integrated together, and the water inlet pipe 501 and the water return pipe 502 are externally connected to a liquid cold source or a liquid heat source obtained by vehicle-mounted heating or heat dissipation; the wind formed by the fan 401 of the air cooling component 4 in the independent air duct 6 of the battery module 2 is forced to heat or cool the battery unit 201 in the battery module 2 after heat exchange through the heat exchanger 503 of the liquid cooling component 5.

[0027] The battery module 2 includes a battery cell 201 fixedly installed by a battery cell fixing frame 202. Multiple groups of battery cells 201 are connected in series to form a battery module. Busbars 203 are provided at both ends of the battery module 2. Current-carrying sheets 204 are provided on the inner side of the busbars. Copper sheets 205 are sandwiched between adjacent battery cell groups. Insulating baffles 206 are provided at both ends of the battery module 2 outside the busbars 203. The insulating baffles 206, busbars 203, current-carrying sheets 204, battery cell fixing frame 202 and copper sheets 205 are connected in series by locking and fixing through a through rod 207 and a fastening nut 208. A gasket 209 is provided on the through rod 207 between the insulating baffle 206 and the fastening nut 208.

[0028] An insulating plate 8 is fixedly provided on the inner side walls of the battery lower box 101 and the battery box upper cover 102. The insulating plate 8 is made of a mica composite plate so as to better insulate the interior of the battery pack and reduce heat loss.

[0029] Embodiment 2:

[0030] The similarities with Example 1 are not repeated here, except that: the battery cells 201 of the battery module 2 are arranged in a diamond shape; and the fan 401 and the heat exchanger 503 are arranged at the left end of the battery module 2 .

[0031] Embodiment 3:

[0032] The similarities with Example 1 are not repeated here, except that: the battery cells 201 of the battery module 2 are arranged in a mixed rectangular and diamond shape; the fan 401 and the heat exchanger 503 are arranged at the right end of the battery module 2.

[0033] Embodiment 4:

[0034] The similarities with Example 1 are not repeated here, and the difference is that: the battery module 2 is a spaced-apart structure, and each independent air duct 6 between the spaced battery modules 2 is sealed and connected to each other and is provided with an air duct 9 for air to pass through, so as to ensure that a closed air duct loop is formed inside the battery module 2, and the inner and outer walls of the air duct 9 are wrapped with tin foil, and a skeleton support is provided inside the air duct 9.

[0035] The above description is only an illustrative specific implementation mode of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any technician in the field without departing from the concept and principle of the present invention should fall within the scope of protection of the present invention.

Claims

1. An air-liquid integrated battery pack, comprising a battery box, a battery module and a battery management unit, wherein the battery box comprises a battery lower box and a battery box upper cover, the battery management unit is electrically connected to the battery module and is used to control the operation of the battery module, and the battery module is provided with battery cells connected in series or in parallel, characterized in that: The battery module is fixedly arranged on the lower battery box, and the battery cells of the battery module are arranged in a rectangular shape or a diamond shape or a mixed rectangular and diamond shape. The gap distance between the battery cells is set to 0.2mm-2mm; it also includes an air cooling component and a liquid cooling component, and the air cooling component includes a fan and foam. The foam is in a rectangular ring shape, and the two sides of the foam are fixed with glue. The battery modules are pressed tightly by three foams, and three independent air ducts perpendicular to the direction of the battery cells are formed in the battery module. The blower directions of the fans in adjacent independent air ducts are opposite. Sealed return air covers are fixedly arranged at both ends of the independent air duct of the battery module, and the independent air duct isolated by foam is utilized. The return air hood realizes the change of wind direction, and finally realizes the series or parallel connection between independent air ducts; at least one fan is arranged inside or at both ends of each independent air duct; the liquid cooling component includes a water inlet pipe, a water return pipe and a heat exchanger, the heat exchanger is perpendicular to the independent air duct and is arranged inside or at both ends of the battery module, the water inlet pipe and the water return pipe are externally connected to the liquid cold source or liquid heat source obtained by vehicle-mounted heating or heat dissipation, the heat exchanger and the fan are integrated together or dispersedly arranged; the wind formed by the fan of the air cooling component in the independent air duct of the battery module is forced to heat or cool the battery unit in the battery module after heat exchange through the heat exchanger of the liquid cooling component.

2. The air-liquid integrated battery pack according to claim 1, characterized in that: The battery module includes a battery cell fixedly installed by a battery cell fixing frame, and multiple groups of battery cells are connected in series to form a battery module. Busbars are arranged at both ends of the battery module, and current-carrying sheets are arranged on the inner side of the busbars. Copper sheets are sandwiched between adjacent battery cell groups, and insulating baffles are arranged at both ends of the battery module outside the busbars. The insulating baffles, busbars, current-carrying sheets, battery cell fixing frame and copper sheets are fixedly connected by through rods and fastening nuts.

3. The air-liquid integrated battery pack according to claim 2, characterized in that: A gasket is arranged on the through rod between the insulating baffle and the fastening nut.

4. The air-liquid integrated battery pack according to claim 1, characterized in that: When the battery modules are of a spaced-apart structure due to limitations on the installation space of the battery pack, each independent air duct between the spaced battery modules is sealed and connected to each other and is provided with an air duct for air to pass through.

5. The air-liquid integrated battery pack according to claim 4, characterized in that: The inner wall and the outer wall of the air duct are wrapped with tin foil, and the inside of the air duct is provided with a skeleton support.

6. The air-liquid integrated battery pack according to any one of claims 1 to 5, characterized in that: The return air cover is made of plastic.

7. The air-liquid integrated battery pack according to any one of claims 1 to 5, characterized in that: An insulating plate is fixedly arranged on the inner side wall of the battery lower box body and the battery box upper cover, and the material of the insulating plate is a quartz or mica composite plate.

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