Battery thermal management system structure and battery pack

Abstract

The utility model belongs to the technical field of battery equipment, and discloses a battery thermal management system structure and a battery pack, the battery thermal management system structure comprises a direct cooling plate and a temperature control assembly, the top surface of the direct cooling plate is connected with the bottom surface of a battery cell, and a liquid cooling flow channel is arranged in the direct cooling plate; a liquid inlet and a liquid outlet which are respectively communicated with the liquid cooling runner are formed in the direct cooling plate, and the liquid inlet and the liquid outlet are formed in the same side of the direct cooling plate; the temperature control assembly comprises a controller, a temperature sensor, a flow regulating valve and a heating film, the controller is in signal connection with the temperature sensor, the flow regulating valve and the heating film, the temperature sensor is arranged on one side of the battery cell, the flow regulating valve is arranged at the liquid inlet and connected with the liquid cooling flow channel, and the heating film is arranged between the direct cooling plate and the battery cell. The battery thermal management system structure and the battery pack disclosed by the utility model are simple in structure, and can accurately control the temperature near the battery cell to be kept in a proper working range, so that the performance of the battery cell is guaranteed, and the service life of the battery cell is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of battery equipment technology, and in particular to a battery thermal management system structure and battery pack. Background Technology

[0002] With the rapid development of electric vehicles and other new energy vehicles, pure electric vehicle users have increasingly higher requirements for driving range and charging rate, resulting in larger battery cell energy. This leads to greater heat generation during battery cell operation. Furthermore, with the increase in the number of cells and charging rate, temperature uniformity becomes more difficult to control. Moreover, in low-temperature environments, it is necessary to heat the battery to ensure normal operation and provide sufficient driving force for vehicles and other equipment. Traditional battery thermal management systems suffer from uneven heat dissipation or heating, low efficiency, complex structure, and difficulty in controlling the temperature difference of the entire battery pack. These issues prevent effective thermal management of the cells, hindering normal cell operation and reducing safety during cell operation. Utility Model Content

[0003] The purpose of this utility model is to provide a battery thermal management system structure and battery pack. The structure is simple and can accurately control the temperature near the battery cell to maintain it within a suitable working range, thereby ensuring the working performance of the battery cell and improving its service life.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] On the one hand, a battery thermal management system structure is provided, including a direct cooling plate and a temperature control component. The top surface of the direct cooling plate is connected to the bottom surface of the battery cell. A liquid cooling channel is provided inside the direct cooling plate. An inlet and an outlet are respectively connected to the liquid cooling channel on the direct cooling plate. The inlet and outlet are located on the same side of the direct cooling plate.

[0006] The temperature control component includes a controller, a temperature sensor, a flow regulating valve, and a heating film. The controller is connected to the temperature sensor, the flow regulating valve, and the heating film respectively. The temperature sensor is located on one side of the battery cell. The flow regulating valve is located at the liquid inlet and is connected to the liquid cooling channel. The heating film is located between the direct cooling plate and the battery cell.

[0007] In one embodiment, the liquid cooling channel includes an inlet pipe and an outlet pipe. The inlet pipe is connected to the inlet port and includes multiple branch pipe groups. The multiple branch pipe groups are evenly arranged in parallel directly below the battery cell. One end of the outlet pipe is connected to the end of each of the multiple branch pipe groups away from the inlet port, and the other end of the outlet pipe is connected to the outlet port.

[0008] In one embodiment, the distribution tube group includes a plurality of distribution tubes that are bent and connected to each other. Each distribution tube includes a first main tube and a plurality of first branch tubes. The plurality of first branch tubes are connected in parallel to each other, and the two ends of the plurality of second branch tubes are respectively connected to the first branch tubes.

[0009] In one embodiment, the outlet pipe includes a second main pipe and a plurality of second branch pipes, wherein the plurality of second branch pipes are connected in parallel and both ends of the plurality of second branch pipes are respectively connected to the second main pipe.

[0010] In one embodiment, the liquid inlet pipe is disposed on the inner side of the direct cooling plate, and the liquid outlet pipe is disposed on the outer side of the direct cooling plate.

[0011] On the other hand, a battery pack is provided, including the above-mentioned battery thermal management system structure, and further including a housing and a battery module. The battery module includes a plurality of battery cells arranged side by side. The direct cooling plate and the housing are integrally formed. The housing includes a frame connected to the direct cooling plate. The frame and the direct cooling plate surround a placement cavity. A pressure beam is provided in the placement cavity. The pressure beam divides the placement cavity into a battery compartment for placing the battery module and an electrical compartment for placing electronic components.

[0012] In one embodiment, the heating film is disposed inside the battery compartment, one end of the heating film passes through the pressure beam and into the electrical compartment and is connected to the electronic components, and a gasket is disposed between the pressure beam and the heating film.

[0013] In one embodiment, the distance between the bottom of the pressure beam and the direct cooling plate is set to X, the thickness of the heating film is set to Y, and the thickness of the gasket is set to Z, where X > Y + 1 mm, Y + 0.4 mm ≤ Z ≤ X - 0.4 mm.

[0014] In one embodiment, the battery compartment is provided with at least one crossbeam that divides the battery compartment into at least two sub-compartments, each of which is provided with a heating film, and the multiple heating films are connected in series.

[0015] In one embodiment, the housing is further provided with a through-wall pipe head, which is disposed through the frame. One end of the through-wall pipe head located outside the placement cavity is connected to an external coolant device, and the other end of the through-wall pipe head located inside the placement cavity is connected to the inlet and the outlet respectively through a connecting nozzle.

[0016] The beneficial effects of this utility model are:

[0017] This utility model discloses a battery thermal management system structure. The top surface of a direct cooling plate is connected to the bottom surface of the battery cell. Coolant circulates within the liquid cooling channel via an inlet and outlet, allowing the direct cooling plate to rapidly cool the battery cell. This effectively reduces the heat generated during battery cell operation, preventing overheating that could lead to performance degradation or even safety issues. Furthermore, a temperature control component is included, with a temperature sensor positioned on one side of the battery cell to monitor the temperature near the cell in real time. The corresponding temperature signal is fed back to the controller, which controls the flow regulating valve to regulate the coolant flow rate or activates the heating film to heat the cell. This precisely controls the temperature near the battery cell, maintaining it within a suitable operating range, ensuring battery cell performance and extending its lifespan. Even further, the inlet and outlet are located on the same side of the direct cooling plate, facilitating temperature neutralization between the incoming and outgoing coolant and preventing excessive temperature differences between cells near the inlet and outlet, which could negatively impact battery cell performance. Attached Figure Description

[0018] Figure 1 This is a partial structural exploded view of the battery thermal management system structure in one embodiment;

[0019] Figure 2 This is a schematic diagram of the liquid cooling channel in one embodiment;

[0020] Figure 3 This is a schematic diagram of the structure of the management group in one embodiment;

[0021] Figure 4 This is a schematic diagram of the liquid outlet pipe in one embodiment;

[0022] Figure 5 This is a schematic diagram of the battery pack structure in one embodiment;

[0023] Figure 6 This is a schematic diagram of the battery pack (excluding the battery module) in one embodiment;

[0024] Figure 7 This is a schematic diagram of the gasket structure in one embodiment;

[0025] Figure 8 This is a schematic diagram of the box structure in one embodiment;

[0026] Figure 9 yes Figure 8 Enlarged structural diagram of section A in the middle;

[0027] Figure 10 This is a schematic diagram of the through-wall pipe head and connecting nozzle in one embodiment.

[0028] In the picture:

[0029] 100. Battery pack; 110. Direct cooling plate; 120. Housing; 121. Frame; 130. Placement cavity; 131. Battery compartment; 1311. Sub-compartment; 132. Electrical compartment; 140. Pressure beam; 150. Gasket; 160. Crossbeam; 170. Through-wall pipe head; 180. Connecting nozzle; 181. Liquid inlet; 182. Liquid outlet; 190. Seal; 210. Temperature sensor; 220. Heating film; 300. Battery module; 310. Battery cell; 400. Liquid cooling channel; 410. Liquid inlet; 420. Liquid outlet; 430. Liquid inlet pipe; 431. Sub-pipe group; 4311. First main pipe; 4312. First branch pipe; 440. Liquid outlet pipe; 441. Second main pipe; 442. Second branch pipe. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] like Figures 1 to 4 As shown, a battery thermal management system structure of this embodiment includes a direct cooling plate 110 and a temperature control component. The top surface of the direct cooling plate 110 is connected to the bottom surface of the battery cell 310. A liquid cooling channel 400 is provided inside the direct cooling plate 110. An inlet 410 and an outlet 420, respectively communicating with the liquid cooling channel 400, are provided on the direct cooling plate 110. The inlet 410 and the outlet 420 are located on the same side of the direct cooling plate 110. The temperature control component includes a controller (not shown), a temperature sensor 210, a flow regulating valve (not shown), and a heating film 220. The controller is connected to the temperature sensor 210, the flow regulating valve, and the heating film 220. The temperature sensor 210 is located on one side of the battery cell 310. The flow regulating valve is located at the inlet 410 and is connected to the liquid cooling channel 400. The heating film 220 is located between the direct cooling plate 110 and the battery cell 310. The structure and principle of the flow regulating valve are the same as those of commonly used flow regulating valves in existing technologies, and will not be described in detail here.

[0035] In this embodiment, the top surface of the direct cooling plate 110 is connected to the bottom surface of the battery cell 310, and the coolant circulates within the liquid cooling channel 400 through the inlet 410 and outlet 420. This allows the direct cooling plate 110 to quickly cool the battery cell 310, effectively reducing the heat generated during operation and preventing overheating that could lead to performance degradation or even safety issues. Furthermore, a temperature control component is included, with a temperature sensor 210 positioned on one side of the battery cell 310 to detect the temperature near the cell in real time. The sensor feeds the corresponding temperature signal back to the controller, which then controls the flow regulating valve to regulate the coolant flow or activates the heating film 220 for heating. This precisely controls the temperature near the battery cell 310 to maintain it within a suitable operating range, ensuring the battery cell's performance and extending its lifespan. Furthermore, the inlet 410 and outlet 420 are located on the same side of the direct cooling plate 110, which helps to neutralize the temperature of the coolant entering and exiting, and avoids excessive temperature difference between the cell 310 near the inlet 410 and the cell 310 near the outlet 420, which would affect the working performance of the cell 310.

[0036] As shown in the figure, in one embodiment, the liquid cooling channel 400 includes an inlet pipe 430 and an outlet pipe 440. The inlet pipe 430 is connected to the inlet port 410. The inlet pipe 430 includes multiple branch pipe groups 431. The multiple branch pipe groups 431 are evenly arranged in parallel directly below the battery cell 310 to achieve uniform cooling of the battery cell 310, avoid large temperature differences between the battery cells 310, and help ensure the operating performance of the battery cell 310. In addition, one end of the liquid outlet pipe 440 is connected to the end of multiple branch pipe groups 431 away from the liquid inlet 410, and the other end of the liquid outlet pipe 440 is connected to the liquid outlet 420. The coolant enters the liquid inlet pipe 430 from the liquid inlet 410 and exchanges heat with the battery cell 310 to cool the battery cell 310. It flows until it enters the liquid outlet pipe 440 at the end away from the liquid inlet 410, and then flows back through the liquid outlet pipe 440 to the liquid outlet 420 on the side near the liquid outlet 420 for discharge. This helps to achieve temperature neutralization between the liquid inlet pipe 430 and the liquid outlet pipe 440, reduce the temperature difference of the cooling plate, and also achieve uniform cooling of the battery cell 310, reduce the temperature difference between the battery cells 310, and help to ensure the operating performance of the battery cell 310.

[0037] like Figure 3 As shown, in one embodiment, the distribution pipe group 431 includes multiple distribution pipes that are bent and connected to each other. Each distribution pipe includes a first main pipe 4311 and multiple first branch pipes 4312. The multiple first branch pipes 4312 are connected in parallel, and the two ends of multiple second branch pipes 442 are respectively connected to the first branch pipes 4312, further improving the uniformity of coolant flow and distribution, and enhancing the overall cooling uniformity. Simultaneously, the design of multiple staggered liquid cooling channels 400 effectively neutralizes the temperature, reduces the temperature difference between the overall battery cells 310, maintains the temperature uniformity of the battery cells 310, and ensures the operational performance of the battery cells 310.

[0038] like Figure 4 As shown, in one embodiment, the outlet pipe 440 includes a second main pipe 441 and multiple second branch pipes 442. The multiple second branch pipes 442 are connected in parallel, and their two ends are respectively connected to the second main pipe 441. After the coolant exchanges heat with the battery cell 310 in the inlet pipe 430 to cool the battery cell 310, the coolant temperature rises. By setting multiple second branch pipes 442 in the outlet pipe 440 to divert and return the coolant, it is beneficial to avoid excessive concentration of high-temperature coolant, which would cause the battery cell 310 near the outlet pipe 440 to have an excessively high operating temperature. This helps to maintain the overall temperature uniformity of the battery cell 310 and ensure the operating performance of the battery cell 310.

[0039] In one embodiment, the liquid inlet pipe 430 is located on the inner side of the direct cooling plate 110, and the liquid outlet pipe 440 is located on the outer side of the direct cooling plate 110, so that after the coolant enters the liquid inlet pipe 430 from the liquid inlet 410, it can quickly cool down the battery cell 310 located on the inner side of the direct cooling plate 110. After completing the heat exchange, it is discharged from the liquid outlet pipe 440 on the outer side of the cooling plate, which can make full use of the coolant and improve the efficiency of coolant use.

[0040] On the other hand, such as Figures 5 to 10 As shown, a battery pack is provided. The battery pack 100 includes the aforementioned battery thermal management system structure. The battery pack 100 also includes a housing 120 and a battery module 300. The battery module 300 includes multiple cells 310 arranged side by side. The direct cooling plate 110 and the housing 120 are integrally formed, which helps to improve the overall strength and ensure the stability of the overall structure of the battery pack 100. The housing 120 includes a frame 121 connected to the direct cooling plate 110. The frame 121 and the direct cooling plate 110 enclose a placement cavity 130. A pressure beam 140 is provided in the placement cavity 130. The pressure beam 140 divides the placement cavity 130 into a battery compartment 131 for placing the battery module 300 and an electrical compartment for placing electronic components (not shown), avoiding mutual interference between the battery module 300 and the electronic components.

[0041] In one embodiment, such as Figure 6 and Figure 7 As shown, the heating film 220 is disposed inside the battery compartment 131. One end of the heating film 220 passes through the pressure beam 140 and into the electrical compartment and is connected to the electronic components. The electronic components supply power and drive the heating film 220. A gasket 150 is provided between the pressure beam 140 and the heating film 220. By providing the gasket 150, the heating film 220 can be effectively prevented from being squeezed by the pressure beam 140 due to flatness or expansion of the battery cell 310, which would cause damage to the heating film 220.

[0042] Specifically, the distance between the bottom of the pressure beam 140 and the direct cooling plate 110 is set to X, the thickness of the heating film 220 is set to Y, and the thickness of the gasket 150 is set to Z, where X > Y + 1 mm and Y + 0.4 mm ≤ Z ≤ X - 0.4 mm. This ensures a favorable relationship between the distance between the bottom of the pressure beam 140 and the cooling plate, the thickness of the heating film 220, and the thickness of the gasket 150. This guarantees the effective separation of the battery compartment 131 and the electrical compartment 132 by the pressure beam 140, reduces the squeezing impact of the pressure beam 140 on the heating film 220, and ensures that the gasket 150 has a corresponding protective function, thereby ensuring the normal operation of the entire battery pack 100.

[0043] In one embodiment, at least one crossbeam 160 is provided within the battery compartment 131, dividing the battery compartment 131 into at least two sub-compartments 1311. Battery modules 300 are placed separately within their respective sub-compartments 1311, reducing mutual interference between battery modules 300 and facilitating thermal management of the battery modules 300. Each sub-compartment 1311 is provided with a heating film 220, and multiple heating films 220 are connected in series to achieve synchronous heating of the battery modules 300 in different sub-compartments 1311. This ensures the overall temperature difference of the battery pack 100 and maintains a consistent operating temperature difference among the battery modules 300 in each sub-compartment 1311, thus guaranteeing the battery's performance.

[0044] In one embodiment, such as Figure 8 and Figure 9 As shown, the housing 120 is also equipped with a through-wall pipe head 170, which is installed through the frame 121. One end of the through-wall pipe head 170 located outside the placement cavity 130 is connected to an external coolant device, and the other end of the through-wall pipe head 170 located inside the placement cavity 130 is connected to the inlet 410 and the outlet 420 respectively via a connecting nozzle 180. A flow regulating valve is installed between the through-wall pipe head 170 and the external coolant device to regulate the flow rate of coolant input from the external coolant device, thereby regulating the cooling rate of the coolant and achieving the effect of regulating the operating temperature of the battery cell 310 inside the placement cavity 130.

[0045] Furthermore, such as Figure 10 As shown, the side of the connecting nozzle 180 connected to the through-wall pipe head 170 is provided with an inlet hole 181 communicating with the inlet port 410 and an outlet hole 182 communicating with the outlet port 420. A sealing element 190 is provided inside the inlet hole 181 and the outlet hole 182 to achieve sealing and waterproofing. In actual operation, the sealing element 190 adopts an O-ring structure to effectively achieve sealing and waterproofing effects.

[0046] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery thermal management system structure, characterized by, The application relates to a battery cooling device. The battery cooling device comprises a direct cooling plate (110), a temperature control assembly and a liquid cooling flow channel (400). The direct cooling plate (110) is connected with the bottom surface of an electric core (310), the liquid cooling flow channel (400) is arranged in the direct cooling plate (110), the direct cooling plate (110) is provided with an inlet (410) and an outlet (420) which are respectively connected with the liquid cooling flow channel (400), and the inlet (410) and the outlet (420) are arranged on the same side of the direct cooling plate (110).

2. The battery thermal management system structure of claim 1, wherein, The temperature control assembly comprises a controller, a temperature sensor (210), a flow regulating valve and a heating film (220), the controller is signal-connected with the temperature sensor (210), the flow regulating valve and the heating film (220), the temperature sensor (210) is arranged on one side of the electric core (310), the flow regulating valve is arranged at the inlet (410), the flow regulating valve is connected with the liquid cooling flow channel (400), and the heating film (220) is arranged between the direct cooling plate (110) and the electric core (310).

3. The battery thermal management system structure of claim 2, wherein, The liquid cooling flow channel (400) comprises an inlet pipeline (430) and an outlet pipeline (440), the inlet pipeline (430) is connected with the inlet (410), the inlet pipeline (430) comprises a plurality of sub-pipeline groups (431), the plurality of sub-pipeline groups (431) are arranged in parallel and below the electric core (310), one end of the outlet pipeline (440) is connected with one end of the plurality of sub-pipeline groups (431) which are away from the inlet (410), and the other end of the outlet pipeline (440) is connected with the outlet (420).

4. The battery thermal management system structure of claim 2, wherein, The sub-pipeline group (431) comprises a plurality of sub-pipeline groups which are arranged in a bending mode, the sub-pipeline comprises a first main pipeline (4311) and a plurality of first branch pipelines (4312), the plurality of first branch pipelines (4312) are arranged in parallel, and two ends of the plurality of first branch pipelines (4312) are respectively connected with the first branch pipelines (4312).

5. The battery thermal management system structure of any one of claims 2 to 4, wherein, The outlet pipeline (440) comprises a second main pipeline (441) and a plurality of second branch pipelines (442), the plurality of second branch pipelines (442) are arranged in parallel, and two ends of the plurality of second branch pipelines (442) are respectively connected with the second main pipeline (441). The inlet pipeline (430) is arranged on the inner side of the direct cooling plate (110), and the outlet pipeline (440) is arranged on the outer side of the direct cooling plate (110).

6. A battery pack, characterized by, The battery thermal management system structure according to any one of claims 1-5, further comprising a box (120) and a battery module (300), the battery module (300) comprising a plurality of the battery cells (310) arranged side by side, the cold plate (110) and the box (120) being integrally formed, the box (120) comprising a frame (121) connected with the cold plate (110), the frame (121) and the cold plate (110) surrounding to form a placement cavity (130), the placement cavity (130) being provided with a pressing beam (140), the pressing beam (140) separating the placement cavity (130) into a battery compartment (131) for placing the battery module (300) and an electrical compartment for placing electronic components.

7. The battery pack of claim 6, wherein, The heating film (220) is arranged in the battery compartment (131), one end of the heating film (220) penetrating the pressing beam (140) and being connected with the electronic components in the electrical compartment, a gasket (150) being arranged between the pressing beam (140) and the heating film (220).

8. The battery pack of claim 7, wherein, The distance between the bottom of the pressing beam (140) and the cold plate (110) is X, the thickness of the heating film (220) is Y, and the thickness of the gasket (150) is Z, X>Y+1mm, Y+0.4mm≤Z≤X-0.4mm.

9. The battery pack of claim 6, wherein, The battery compartment (131) is provided with at least one cross beam (160), the cross beam (160) separating the battery compartment (131) into at least two sub-compartments (1311), each of the sub-compartments (1311) being provided with one heating film (220), and the plurality of heating films (220) being connected in series.

10. The battery pack of any one of claims 6-9, wherein, The box (120) is further provided with a through-wall pipe head (170), the through-wall pipe head (170) penetrating the frame (121), one end of the through-wall pipe head (170) outside the placement cavity (130) being connected with an external cooling liquid device, and the other end of the through-wall pipe head (170) inside the placement cavity (130) being connected with the liquid inlet (410) and the liquid outlet (420) through a connecting pipe nozzle (180), respectively.

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