Power battery cooling system

Abstract

The utility model discloses a power battery cooling system, which belongs to the technical field of power batteries and comprises a box body, the box body comprises an enclosed frame, a liquid inlet flow channel and a liquid outlet flow channel which are isolated from each other are arranged in the frame, the liquid inlet flow channel is connected with a water pipe main inlet interface, and the liquid outlet flow channel is connected with a water pipe main outlet interface; a plurality of battery cell components are arranged in the box body. A liquid cooling plate assembly is arranged in the box body along the large surface side of the battery cell assembly, partition plates are arranged in the box body between the battery cell assemblies, the partition plates comprise liquid inlet partition plates and liquid outlet partition plates, and the liquid inlet partition plates and the liquid outlet partition plates are alternately arranged; a flow path is formed in the box body according to the flowing sequence of cooling liquid of the liquid inlet flow channel, the liquid inlet partition plate, the liquid cooling plate assembly, the liquid outlet partition plate and the liquid outlet flow channel. According to the utility model, the large surface of the battery cell assembly can be cooled, heat can be discharged along with fluid, a heating source can be directly cooled, and the cooling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a power battery cooling system. Background Art

[0002] With the rapid development of the new energy vehicle market, the performance and safety requirements for power batteries are becoming increasingly stringent. As the power source of new energy vehicles, power battery systems must have a reasonable thermal management system to ensure their efficient and reliable operation.

[0003] For example, a Chinese patent document with publication number CN112510302A discloses a liquid-cooled battery pack case, which includes an outer frame and a plurality of mounting base plates arranged in the outer frame, wherein the mounting base plates are used to mount battery cells. The outer frame includes a first frame, a second frame, a third frame and a fourth frame connected end to end to form a rectangular frame, and a plurality of the mounting base plates are installed in the outer frame at intervals along the length direction of the outer frame. A liquid cooling channel is opened inside the outer frame, and the liquid cooling channel is used to pass cooling liquid.

[0004] The liquid cooling channel inside the above outer frame can play a certain cooling role, and the structure is relatively simple, but the heat of the battery pack body is mainly concentrated on the large surface of the lithium battery, and the cooling effect of the outer frame is very limited. Utility Model Content

[0005] The purpose of the utility model is to provide a power battery cooling system to solve the problem in the prior art that the heat of the battery pack box is mainly concentrated on the large surface of the lithium battery and the cooling effect of the outer frame is very limited.

[0006] To achieve the above-mentioned objectives, the present invention provides a power battery cooling system, comprising a housing, the housing comprising an enclosing frame, the interior of the frame being provided with mutually isolated liquid inlet and liquid outlet channels, the liquid inlet channels being connected to a water pipe inlet interface, and the liquid outlet channels being connected to a water pipe outlet interface; a plurality of battery cell assemblies being disposed within the housing, a liquid cooling plate assembly being disposed along the large surfaces of the battery cell assemblies within the housing, partitions being disposed between the battery cell assemblies within the housing, the partitions comprising liquid inlet partitions and liquid outlet partitions being arranged alternately; a flow path for coolant is formed within the housing in the order of liquid inlet channel, liquid inlet partition, liquid cooling plate assembly, liquid outlet partition, and liquid outlet channel.

[0007] Separate liquid inlet and outlet channels are provided inside the frame to achieve a design in which the outflow and inflow of fluids are located in different areas without interfering with each other. Moreover, the frame, as the main support member of the box, can meet the structural strength of the box after the battery cell assembly is loaded; the provision of liquid inlet and outlet channels inside the frame helps to achieve a lightweight box structure. The liquid cooling plate assembly is provided on the large surface side of the battery cell assembly, and the partition is the medium for communicating between the box and the liquid cooling plate assembly. The cooling liquid or fluid passes through the flow path in order to cool the large surface of the battery cell assembly and discharge the heat with the fluid, directly completing the cooling of the heat source and improving the cooling efficiency.

[0008] Furthermore, the liquid inlet end of the liquid inlet partition is connected to the liquid inlet channel, and the liquid outlet end of the liquid inlet partition is connected to the liquid inlet of the liquid cooling plate assembly; the liquid inlet end of the liquid outlet partition is connected to the liquid outlet of the liquid cooling plate assembly, and the liquid outlet end of the liquid outlet partition is connected to the liquid outlet channel.

[0009] The coolant can enter the liquid cooling plate assembly through the liquid inlet channel, and the liquid cooling plate assembly cools the battery cell assembly. The heated coolant enters the liquid outlet channel through the liquid outlet partition, and is then discharged from the liquid outlet channel of the box.

[0010] Furthermore, a plurality of parallel and spaced cavities are provided inside the partition, and the cavities are provided along the length direction of the partition.

[0011] The baffle's channels separate the inflow and outflow of liquid, preventing them from interfering with each other. Furthermore, when the inlet baffle is in the middle, liquid needs to be fed to the cold plate assemblies on both sides. Different channels can feed liquid to different sides of the cold plate assemblies, achieving liquid diversion and improving liquid inlet efficiency.

[0012] Furthermore, a single battery cell assembly includes an aluminum shell, which is divided into at least two cavities, and the two cavities are separated and connected; a winding core is installed in each cavity and each cavity is sealed by a cover plate.

[0013] The aluminum shell of a single cell assembly consists of at least two separate but connected cavities, effectively forming the two aluminum shells into a single, integral unit through stamping, simplifying the manufacturing process. During core assembly, at least two cores can be assembled simultaneously, reducing subsequent assembly steps, lowering manufacturing costs, and increasing product weight reduction.

[0014] Furthermore, the battery cell assembly is arranged across a partition, and the partition is located between the two cavities.

[0015] The two cavities of the battery cell assembly are separated and kept connected, so there is a gap between the two cavities. The battery cell assembly is arranged across the partition so that the partition is just in the gap, which can save the internal space of the box and make the flow channel structure in the box reasonably arranged.

[0016] Furthermore, the liquid cooling plate assembly includes two liquid cooling outer plates, a liquid cooling manifold plate and two transfer tubes. The two liquid cooling outer plates form a shell structure to cover the liquid cooling manifold plate. The two transfer tubes are respectively connected to the liquid inlet and outlet ends of the liquid cooling manifold plate.

[0017] The liquid-cooled manifold plate is enclosed within a sealed housing formed by two liquid-cooled outer plates, protecting it and isolating it from heat transfer. Adapter tubes connect the liquid-cooled plate assembly to other components, improving the cooling flow path.

[0018] Furthermore, the liquid-cooling channel plate includes a channel that is reciprocatingly arranged in an S-shape along its length.

[0019] By setting the flow channel into an S-shaped reciprocating structure, the length of the flow channel can be increased as much as possible within the limited space of the liquid cooling channel plate, thereby extending the time for the coolant to flow in the flow channel, thereby improving the cooling effect of the liquid cooling plate assembly.

[0020] Furthermore, the transfer tube at the liquid outlet end of the liquid-cooling channel plate is connected to the cavity of the liquid outlet partition.

[0021] The liquid cooling channel plate is connected to the liquid outlet partition through a transfer pipe. The coolant flows out from the liquid outlet end of the liquid cooling channel plate and enters the cavity of the liquid outlet partition. Then, the coolant can be collected from the liquid outlet partition into the liquid outlet channel in the frame.

[0022] Furthermore, the water pipe main inlet interface and the water pipe main outlet interface are both arranged on the outside of the box body, the water pipe main inlet interface is connected to the liquid supply device, and the water pipe main outlet interface is connected to the liquid collecting device.

[0023] The main water pipe inlet and outlet ports are located outside the box, making it easy to connect and install the liquid supply device and the liquid collection device. In addition, the main water pipe inlet and outlet ports located outside the box can also prevent leakage from the ports from causing leakage or short circuit of the internal components of the box.

[0024] Furthermore, electrical components are provided in the box, and the electrical components are located between the frame and the partition.

[0025] The electrical components are primarily used to monitor and provide feedback on the temperature and pressure inside the power battery, enhancing battery safety. They are located between the frame and the partition, creating a relatively isolated space. Their proximity to the frame indicates they are positioned at the edge of the power battery, minimizing interference from the battery cell assembly.

[0026] Compared with the existing known technologies, the technical solution provided by the present invention has the following beneficial effects:

[0027] (1) The utility model provides a power battery cooling system, wherein isolated liquid inlet and outlet channels are provided inside the frame, so that the outflow and inflow of fluids are located in different areas without interfering with each other. The liquid cooling plate assembly is provided on the large surface side of the battery cell assembly, and the partition is the medium for connecting the box body and the liquid cooling plate assembly. The cooling liquid or fluid passes through the flow path in order to cool the large surface of the battery cell assembly and discharge the heat with the fluid, thereby directly cooling the heat source and improving the cooling efficiency.

[0028] It will be apparent that elements or features described above in connection with a single embodiment may be used alone or in combination in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In the drawings, the sizes and proportions do not represent the sizes and proportions of actual products. The drawings are merely illustrative and some non-essential elements or features are omitted for clarity.

[0030] Figure 1 This is a schematic diagram of the three-dimensional structure of the power battery in the embodiment of the present utility model;

[0031] Figure 2 This is a schematic diagram of the cooling flow path of the cooling system in an embodiment of the present utility model;

[0032] Figure 3 This is a schematic diagram of the explosion structure of the power battery in the embodiment of the present utility model;

[0033] Figure 4 It is a schematic cross-sectional view of the water pipe main inlet interface and the water pipe main outlet interface in the embodiment of the present utility model;

[0034] Figure 5 This is a schematic structural diagram of a partition in an embodiment of the present utility model;

[0035] Figure 6 This is an exploded schematic diagram of the battery cell assembly structure in an embodiment of the present utility model;

[0036] Figure 7 It is an exploded schematic diagram of the liquid cooling plate assembly structure in an embodiment of the present invention.

[0037] Description of Reference Numerals

[0038] 1. Cell assembly; 2. Liquid cooling plate assembly; 3. Partition; 301. Liquid inlet partition; 302. Liquid outlet partition; 310. Cavity; 4. Electrical components; 5. Water pipe main inlet interface; 6. Box; 610. Frame; 611. Liquid inlet channel; 612. Liquid outlet channel; 7. Cover; 8. Winding core; 9. Aluminum shell; 10. Liquid cooling outer plate; 11. Liquid cooling channel plate; 12. Transfer pipe; 13. Water pipe main outlet interface. DETAILED DESCRIPTION

[0039] The present invention will be described in detail below with reference to the accompanying drawings. What is described here is merely a preferred embodiment of the present invention, and those skilled in the art may conceive of other methods for implementing the present invention based on the preferred embodiment, and such other methods also fall within the scope of the present invention.

[0040] Example

[0041] Reference Figure 1-Figure 7 This embodiment provides a power battery cooling system, including a housing 6, which includes an enclosed frame 610. Within the frame 610 are isolated liquid inlet channels 611 and liquid outlet channels 612. The liquid inlet channels 611 are connected to the water pipe inlet interface 5, and the liquid outlet channels 612 are connected to the water pipe outlet interface 13. The isolation of the liquid inlet channels 611 and the liquid outlet channels 612 allows for a design in which fluid outflow and inflow are located in separate areas without interfering with each other. Several battery cell assemblies 1 are disposed within the housing 6, and the battery cell assemblies 1 are arranged in rows and columns. A liquid cooling plate assembly 2 is disposed within the housing 6 along the large surface of the battery cell assembly 1. Partitions 3 are disposed between the battery cell assemblies 1 within the housing 6. The partitions 3 include a liquid inlet partition 301 and a liquid outlet partition 302, which are arranged alternately. A flow path is formed within the housing 6 in the order of liquid inlet channel 611, liquid inlet partition 301, liquid cooling plate assembly 2, liquid outlet partition 302, and liquid outlet channel 612. The liquid cooling plate assembly 2 is disposed on the large surface of the battery cell assembly 1, and the partition 3 serves as a medium for communication between the housing 6 and the liquid cooling plate assembly 2. Cooling liquid or fluid flows through the flow path in this order, cooling the large surface of the battery cell assembly 1 and discharging heat with the fluid, directly cooling the heat source and improving cooling efficiency.

[0042] It is understandable that, in addition to the frame 610, the box body 6 is also provided with a bottom plate at the bottom to carry the battery cell assembly 1 and flow path components, etc. The battery cell assembly 1 includes two large surfaces, and liquid cooling plate assemblies 2 are provided on both sides of the large surface of the battery cell assembly 1 to improve the cooling efficiency. In addition, the frame 610, as the main support member of the box body 6, can meet the structural strength requirements of the box body 6 when it is fully loaded with battery cell assemblies 1. The liquid inlet flow channel 611 and the liquid outlet flow channel 612 are provided in the frame 610, which can remove part of the material of the frame 610, reduce the weight of the frame 610, and help to achieve the lightweight structure of the box body 6.

[0043] Specifically, the liquid inlet end of the liquid inlet partition 301 is connected to the liquid inlet channel 611, and the liquid outlet end of the liquid inlet partition 301 is connected to the liquid inlet of the liquid cooling plate assembly 2; the liquid inlet end of the liquid outlet partition 302 is connected to the liquid outlet of the liquid cooling plate assembly 2, and the liquid outlet end of the liquid outlet partition 302 is connected to the liquid outlet channel 612. The coolant can enter the liquid cooling plate assembly 2 through the liquid inlet channel 611, and the liquid cooling plate assembly 2 cools the battery cell assembly 1. The heated coolant enters the liquid outlet channel 612 through the liquid outlet partition 302, and is then discharged from the liquid outlet channel 612 of the box body 6. It should be noted that, if Figure 4 As shown, the liquid inlet channel 611 is located below the liquid outlet channel 612. Generally, the temperature of the coolant flowing in the liquid outlet channel 612 is higher, and the heat will diffuse upward. Setting the liquid outlet channel 612 at an upper position is conducive to heat dissipation.

[0044] Furthermore, in some embodiments of the present application, Figure 5 As shown, the interior of the partition 3 is provided with three parallel and spaced cavities 310, which are arranged along the length of the partition 3. The cavities 310 of the partition 3 can separate the inflow and outflow processes of liquid, preventing mutual interference between the two. Moreover, when the liquid inlet partition 301 is in the middle position, liquid needs to be fed to the liquid cooling plate assemblies 2 on both sides. Different cavities 310 can feed liquid to the liquid cooling plate assemblies 2 on different sides, realizing liquid diversion and improving liquid inlet efficiency.

[0045] In some embodiments of this application, please refer to Figure 6 , a single battery cell assembly 1 includes an aluminum shell 9, and the aluminum shell 9 is divided into two cavities, and the two cavities are separated and kept connected; a core 8 is installed in each cavity and each cavity is sealed by a cover plate 7. The aluminum shell 9 of a single battery cell assembly 1 includes two cavities, and the two cavities are separated and kept connected, which is equivalent to connecting the two aluminum shells 9 into a whole and performing stamping, which simplifies the manufacturing process. When assembling the core 8, two cores 8 can be assembled at one time, which reduces the subsequent assembly steps, reduces the manufacturing cost, and increases the lightweight of the product. It is understandable that the aluminum shell 9 can also be divided into more than two cavities, such as three, four or even more.

[0046] Preferably, in some embodiments of the present application, the battery cell assembly 1 is arranged across the partition 3, and the partition 3 is located between the two cavities. The two cavities of the battery cell assembly 1 are separated and connected, so there is a gap between the two cavities. The battery cell assembly 1 is arranged across the partition 3 so that the partition 3 is located in the gap, which can save the internal space of the box 6 and make the flow channel structure in the box 6 reasonably arranged.

[0047] In some embodiments of the present application, Figure 7As shown, the liquid cooling plate assembly 2 includes two liquid cooling outer plates 10, a liquid cooling manifold plate 11 and two transfer tubes 12. The two liquid cooling outer plates 10 form a shell structure to cover the liquid cooling manifold plate 11. The liquid cooling manifold plate 11 is covered by the two liquid cooling outer plates 10, so that the liquid cooling manifold plate 11 is located in the closed shell formed by the liquid cooling outer plates 10, which plays a role in protecting the liquid cooling manifold plate 11 and isolating heat transfer. The two transfer tubes 12 are respectively connected to the liquid inlet and liquid outlet of the liquid cooling manifold plate 11. The transfer tube 12 is used to connect the liquid cooling plate assembly 2 to other components to improve the cooling flow path.

[0048] Furthermore, the liquid-cooling manifold plate 11 includes a flow channel that is reciprocally arranged in an S-shape along its length. The length of the flow channel can be increased as much as possible within the limited space of the liquid-cooling manifold plate 11, thereby extending the time for the coolant to flow in the flow channel, thereby improving the cooling effect of the liquid-cooling plate assembly 2. The transfer pipe 12 at the liquid outlet end of the liquid-cooling manifold plate 11 is connected to the cavity 310 of the liquid outlet partition 302. The liquid-cooling manifold plate 11 is connected to the liquid outlet partition 302 through the transfer pipe 12. After the coolant flows out from the liquid outlet end of the liquid-cooling manifold plate 11, it enters the cavity 310 of the liquid outlet partition 302 and can then be collected from the liquid outlet partition 302 into the liquid outlet flow channel 612 in the frame 610.

[0049] In some embodiments of this application, please refer to Figure 1 The main water pipe inlet 5 and outlet 13 are both located outside the housing 6. The main water pipe inlet 5 is connected to the liquid supply device, while the main water pipe outlet 13 is connected to the liquid collection device. The main water pipe inlet 5 and outlet 13 are both located outside the housing 6, facilitating connection and installation with the liquid supply device and the liquid collection device. Furthermore, their location outside the housing 6 prevents electrical leakage or short circuits in components within the housing 6 caused by interface leakage.

[0050] It is understandable that electrical components 4 are provided in the box body 6, and the electrical components 4 are located between the frame 610 and the partition 3. The electrical components 4 are mainly used to monitor and feedback the temperature and pressure conditions inside the power battery to improve the safety of the power battery. The electrical components 4 are provided between the frame 610 and the partition 3. The electrical components 4 are in a relatively independent space. Being close to the frame 610 means that the electrical components 4 are located at the edge of the power battery, reducing the interference of the battery cell assembly 1 on the electrical components 4. It should be noted that the electrical components 4 mainly include BMS, BDU and other parts. The figure only uses one part as a schematic to indicate that these electrical components are arranged between the frame and the partition to ensure safety.

[0051] Finally, it should be noted that the entire cooling route is as follows Figure 2As shown, cooler cooling water enters the frame of the housing 6 through the main water pipe inlet port 5, then passes through two liquid inlet baffles 301 to be delivered to each liquid cold plate assembly 2. After thermal contact with the large surface of the battery cells, the coolant temperature increases, and then passes through three liquid outlet baffles 302 to reach the frame of the housing 6, and then the fluid is discharged through the main water pipe outlet port 13. This systematic cooling method achieves more uniform temperature distribution in the battery, which helps improve battery performance and cycle life.

[0052] In the description of this utility model, it should be noted that the terms "front," "back," "left," "right," "up," "down," "top," "bottom," "inside," and "outside" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0054] The scope of protection of the present invention is limited solely by the claims. Thanks to the teachings of the present invention, those skilled in the art will readily recognize that alternative structures to the structures disclosed in the present invention may be used as viable alternative embodiments, and that the embodiments disclosed in the present invention may be combined to produce new embodiments, which also fall within the scope of the appended claims.

Claims

1. A power battery cooling system, comprising A box (6), the box (6) comprising an enclosed frame (610), wherein a liquid inlet channel (611) and a liquid outlet channel (612) isolated from each other are provided inside the frame (610), the liquid inlet channel (611) being connected to a water pipe main inlet interface (5), and the liquid outlet channel (612) being connected to a water pipe main outlet interface (13); a plurality of battery core assemblies (1) are provided inside the box (6); It is characterized by: A liquid cooling plate assembly (2) is provided in the box (6) along the large side of the battery cell assembly (1); a partition (3) is provided in the box (6) between the battery cell assemblies (1); the partition (3) includes a liquid inlet partition (301) and a liquid outlet partition (302), which are arranged alternately; a flow path is formed in the box (6) in the order of a coolant flow of a liquid inlet channel (611), a liquid inlet partition (301), a liquid cooling plate assembly (2), a liquid outlet partition (302), and a liquid outlet channel (612).

2. A power battery cooling system according to claim 1, characterized in that: The liquid inlet end of the liquid inlet baffle (301) is connected to the liquid inlet channel (611), and the liquid outlet end of the liquid inlet baffle (301) is connected to the liquid inlet of the liquid cooling plate assembly (2); the liquid inlet end of the liquid outlet baffle (302) is connected to the liquid outlet of the liquid cooling plate assembly (2), and the liquid outlet end of the liquid outlet baffle (302) is connected to the liquid outlet channel (612).

3. A power battery cooling system according to claim 2, characterized in that: A plurality of parallel and spaced cavities (310) are provided inside the partition (3), and the cavities (310) are arranged along the length direction of the partition (3).

4. A power battery cooling system according to claim 1, characterized in that: A single battery cell assembly (1) comprises an aluminum shell (9), wherein the aluminum shell (9) is divided into at least two cavities, and the two cavities are separated and connected; a winding core (8) is installed in each cavity, and each cavity is sealed by a cover plate (7).

5. A power battery cooling system according to claim 4, characterized in that: The battery core assembly (1) is arranged across a partition (3), and the partition (3) is located between two cavities.

6. A power battery cooling system according to claim 3, characterized in that: The liquid cooling plate assembly (2) comprises two liquid cooling outer plates (10), a liquid cooling flow channel plate (11) and two transfer tubes (12); the two liquid cooling outer plates (10) form a shell structure to cover the liquid cooling flow channel plate (11); and the two transfer tubes (12) are respectively connected to the liquid inlet end and the liquid outlet end of the liquid cooling flow channel plate (11).

7. A power battery cooling system according to claim 6, characterized in that: The liquid cooling channel plate (11) comprises a channel arranged in an S-shaped reciprocating manner along its length direction.

8. The power battery cooling system according to claim 6, characterized in that: The transfer pipe (12) at the liquid outlet end of the liquid-cooling channel plate (11) is connected to the cavity (310) of the liquid outlet partition (302).

9. The power battery cooling system according to claim 1, characterized in that: The water pipe main inlet interface (5) and the water pipe main outlet interface (13) are both arranged on the outside of the box body (6); the water pipe main inlet interface (5) is connected to the liquid supply device, and the water pipe main outlet interface (13) is connected to the liquid collection device.

10. The power battery cooling system according to claim 1, characterized in that: An electrical component (4) is provided in the box (6), and the electrical component (4) is located between the frame (610) and the partition (3).

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