Power battery pack immersed cooling system and battery pack

Abstract

The utility model relates to the technical field of thermal management of power batteries, in particular to an immersed cooling system of a power battery pack and the battery pack, which comprises a frame body with a plurality of closed spaces consisting of a front edge beam, a front cross beam, a shunting partition plate, a middle cross beam, a side edge beam, a middle longitudinal beam, top sealing foam and bottom structural adhesive, a plurality of battery cells are arranged in each space of the frame body, and a foam group with a diversion function is arranged between adjacent battery cells in each space. When in use, the battery cells are arranged in each space of the frame body, and the foam groups are arranged between the adjacent battery cells, so that the foam groups not only can absorb the expansion of the battery cells, but also can guide current to homogenize the temperature of the single battery cells and ensure the temperature consistency of the single battery cells; and the cooling liquid is in direct contact with the battery cell, so that the battery cell can be rapidly cooled after thermal runaway, and the risk of heat spreading is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power battery thermal management, in particular to an immersion cooling system for a power battery pack and a battery pack. Background Art

[0002] Thermal management of power batteries is a new technology that is based on the influence of temperature on battery performance, combined with the electrochemical characteristics and heat generation mechanism of the battery, based on the optimal charging and discharging temperature range of the specific battery. It is established through reasonable design on the basis of multiple disciplines and fields such as materials science, electrochemistry, heat transfer, molecular dynamics, etc. It is designed to solve the problem of thermal dissipation or thermal runaway caused by the battery working at too high or too low temperatures, so as to improve the overall performance of the battery.

[0003] There are many existing technologies for power battery thermal management, such as:

[0004] Chinese patent publication number CN217426905U discloses a power battery cooling plate, including a support plate, a flow channel plate and a diverter plate, wherein a cooling medium inlet and a cooling medium outlet are provided on the support plate, a cooling medium liquid inlet channel, a cooling medium liquid collecting channel and a plurality of cooling medium cooling channels are formed between the support plate and the flow channel plate, a cooling medium liquid separation channel is formed between the diverter plate and the support plate, one end of the cooling medium liquid separation channel is connected with the cooling medium liquid inlet channel through a liquid inlet hole penetrating the support plate, the inlets of each cooling medium cooling channel are connected with the cooling medium liquid separation channel through a diverter hole penetrating the support plate, respectively, and each diverter hole is arranged in sequence along the flow direction of the cooling medium in the cooling medium liquid separation channel, and the aperture of each diverter hole increases in sequence along the flow direction of the cooling medium in the cooling medium liquid separation channel.

[0005] It can be seen that most power battery thermal management systems include support plates, flow channel plates and diverter plates. The coolant flows in the space inside the plate to form a liquid-cooled plate structure. The coolant and the plate are used for heat exchange to achieve the cooling effect on the power battery. However, due to its own structure, the liquid-cooled plate structure has limited cooling capacity, difficult to control the temperature difference between single cells, and difficult to solve thermal safety problems. These problems are difficult to solve by optimizing the liquid-cooled plate structure. At the same time, with the continuous improvement of the capacity, energy density and charge and discharge rate of the power battery pack system, the above problems of the liquid-cooled plate structure will become more prominent.

[0006] In view of this, we propose an immersion cooling system for a power battery pack and a battery pack. Utility Model Content

[0007] The purpose of the utility model is to provide a power battery pack immersion cooling system and a battery pack in which the battery is in direct contact with the coolant, so as to solve the problems raised in the above-mentioned background technology.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] A power battery pack immersion cooling system includes a frame body with four enclosed spaces consisting of a front side beam, a front cross beam, a diversion baffle, a middle cross beam, a side beam, a middle longitudinal beam, a top sealing foam and a bottom structural adhesive. Battery cells are equidistantly arranged in each space of the frame body, and a foam group with a flow guide function is arranged between adjacent battery cells in each space.

[0010] As a further solution of the utility model: a current collector is provided at one end of the middle longitudinal beam, and a connecting pipeline for discharging coolant is provided at one end of the current collector.

[0011] As a further solution of the utility model: a middle end of the middle longitudinal beam is provided with a middle end hole, and an end of the middle longitudinal beam away from the collector is provided with a rear end hole. Four flow channels are provided in the middle longitudinal beam from top to bottom, of which the upper two flow channels are connected to the middle end hole, and the lower two flow channels are connected to the rear end hole.

[0012] As a further solution of the utility model: the top sealing foam and the bottom structural adhesive seal the battery core and the foam group, the foam group includes an upper guide foam and a lower guide foam fixed on the battery core, and the upper guide foam and the lower guide foam form a Z-shaped flow channel.

[0013] As a further solution of the utility model: the front cross beam and the middle cross beam are of the same height and width, the two ends of the front cross beam and the middle cross beam are respectively fixed to one side of the side beam, the two ends of the front cross beam are respectively provided with a second opening with a double-layer opening, the two ends of the middle cross beam are respectively provided with a third opening with a single-layer opening, and the opening area of ​​the third opening is half of the second opening.

[0014] As a further solution of the utility model: a flow dividing baffle is fixed between the middle partition of the second opening and one end of the third opening close to the middle cross beam.

[0015] As a further solution of the utility model: both ends of the front side beam are provided with a first opening, and the first opening is connected to the second opening.

[0016] As a further solution of the utility model: the inner cavity of the front side beam is provided with a flow pipe, a coolant discharge port is provided on one side of the front side beam, and a coolant guide plate is fixed to the inner cavity of the front side beam above the discharge port.

[0017] As a further solution of the utility model: an insertion port for fixing the connecting pipeline is provided in the space enclosed by the guide plate.

[0018] A battery pack is applicable to the above-mentioned power battery pack immersion cooling system.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1. In the power battery pack immersion cooling system and battery pack, a battery cell is arranged in each space of the frame, and a foam group is arranged between adjacent battery cells. The foam group can absorb the expansion of the battery cell and guide the temperature of the single battery cell to ensure the temperature consistency of the single battery cell.

[0021] 2. In the immersion cooling system and battery pack of the power battery pack, when the coolant cools the battery cell through the foam group, the coolant directly contacts the battery cell. When thermal runaway occurs, the battery cell can be cooled rapidly, thereby reducing the risk of heat spread. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of this scheme;

[0023] Figure 2 This is a schematic diagram of the overall flow direction of the coolant in this solution;

[0024] Figure 3 This is a schematic diagram of the middle longitudinal beam structure of this scheme;

[0025] Figure 4 This is a schematic diagram of the coolant flow in the middle longitudinal beam of this solution;

[0026] Figure 5 This is a schematic diagram of the battery cell side cooling channel assembly of this solution;

[0027] Figure 6 This is a schematic diagram of the flow path on the side of the battery cell of this solution;

[0028] Figure 7 This is a schematic diagram of the front crossbeam structure of this scheme;

[0029] Figure 8 This is a schematic diagram of the middle crossbeam structure of this scheme;

[0030] Fig. 9 This is a schematic diagram of the front beam structure of this scheme;

[0031] Fig.10 This is a schematic diagram of the coolant flow in the front side beam of this solution.

[0032] The meaning of each number in the figure is:

[0033] 100, front side beam; 101, first opening; 102, insertion port; 103, discharge port; 104, guide plate;

[0034] 200, front crossbeam; 201, second opening;

[0035] 300, diversion baffle;

[0036] 400, middle cross beam; 401, third opening;

[0037] 500, side beam;

[0038] 600, middle longitudinal beam; 601, middle end hole; 602, rear end hole; 603, connecting pipeline; 604, current collector;

[0039] 700, foam group; 701, upper guide foam; 702, lower guide foam;

[0040] 800, battery cell; 801, top sealing foam; 802, bottom structural adhesive. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] like Figure 1 and Figure 5 As shown, the present embodiment provides an immersion cooling system for a power battery pack and a battery pack, including a frame with several enclosed spaces composed of a front side beam 100, a front cross beam 200, a diverter baffle 300, a middle cross beam 400, a side beam 500, a middle longitudinal beam 600, a top sealing foam 801 and a bottom structural adhesive 802. A battery cell 800 is arranged in each space of the frame, and a foam group 700 with a flow guide function is fixed between adjacent battery cells 800 in each space. It should be further explained that the present embodiment uses a frame with four enclosed spaces.

[0043] The improvement of this embodiment is that: by arranging a battery cell 800 in each space of the frame, a foam group 700 is arranged between adjacent battery cells 800. The foam group 700 can absorb the expansion of the battery cell 800 and guide the temperature of the single battery cell 800 to ensure the temperature consistency of the single battery cell 800.

[0044] like Figure 3 and Figure 4As shown, in order to realize the discharge, diversion and shunting of the coolant into the frame body, a current collector 604 is provided at one end of the middle longitudinal beam 600, and a connecting pipe 603 for discharging the coolant is provided at one end of the current collector 604. A middle end hole 601 is provided at the middle end of the middle longitudinal beam 600, and a rear end hole 602 is provided at the end of the middle longitudinal beam 600 away from the current collector 604. Four flow channels are provided in the middle longitudinal beam 600 from top to bottom, wherein the upper two flow channels are connected to the middle end hole 601, and the lower two flow channels are connected to the rear end hole 602. By integrating the connecting pipe 603 and the current collector 604 in the middle longitudinal beam 600, and simultaneously opening the middle end hole 601 and the rear end hole 602 on the beam body of the middle longitudinal beam 600, the middle longitudinal beam 600 can be used as a structural member to ensure the X-direction strength of the whole package, and also has the functions of diversion and diversion.

[0045] like Figure 5 and Figure 6 As shown, considering cooling the battery cell 800, the top sealing foam 801 and the bottom structural adhesive 802 seal the battery cell 800 and the foam group 700. The foam group 700 includes an upper guide foam 701 and a lower guide foam 702 fixed to the battery cell 800 by double-sided adhesive. The upper guide foam 701 and the lower guide foam 702 form a Z-shaped flow channel. All battery cells 800 are in direct contact with the coolant. When thermal runaway occurs, the battery cell 800 can be cooled rapidly, thereby reducing the risk of heat spread. The flow channels between all battery cells 800 are connected in parallel, so that the cooling of the battery cell 800 is carried out synchronously, which can greatly reduce the pressure loss of the entire package.

[0046] like Figure 1 , Figure 7 and Figure 8 As shown, in order to avoid the coolant discharged from the rear end hole 602 from affecting the coolant discharged from the middle end hole 601 during recovery, the front cross beam 200 and the middle cross beam 400 are of the same height and width, and both ends of the front cross beam 200 and the middle cross beam 400 are respectively fixed to one side of the side beam 500, and both ends of the front cross beam 200 are respectively provided with a second opening 201 with a double-layer opening, and both ends of the middle cross beam 400 are respectively provided with a third opening 401 with a single-layer opening, and the opening area of ​​the third opening 401 is half of the second opening 201. A diverter baffle 300 is fixed between the middle partition of the second opening 201 and one end of the third opening 401 close to the middle cross beam 400. The diverter baffle 300 is used to divert and recover the coolant discharged from the middle end hole 601 and the rear end hole 602 again to avoid the coolants from affecting each other.

[0047] like Fig. 9 and Fig.10As shown, taking into account the centralized recovery and discharge of the coolant and the fixed connecting pipeline 603, the first openings 101 are provided at both ends of the front side beam 100, and the first opening 101 is connected with the second opening 201, so that the coolant flows into the front side beam 100 through the second opening 201 and the first opening 101, and the inner cavity of the front side beam 100 is provided with a flow pipeline, and a coolant discharge port 103 is provided on one side of the front side beam 100, and a coolant guide plate 104 is fixed to the inner cavity of the front side beam 100 above the discharge port 103, and the coolant is guided by the guide plate 104 so that it flows out of the discharge port 103 in a centralized manner, and an insertion port 102 is provided in the space enclosed by the guide plate 104, and the connecting pipeline 603 is inserted into the insertion port 102 to fix the connecting pipeline 603.

[0048] In summary, the overall flow direction of the coolant in this solution is as follows: Figure 2 As shown:

[0049] The connecting pipe 603 is connected to the discharge pipe of the external coolant. The coolant enters the middle longitudinal beam 600 through the connecting pipe 603 and the current collector 604 and is divided. The coolant is discharged from the middle end hole 601 and the rear end hole 602 of the middle longitudinal beam 600 respectively, and is divided again to the two ends of the middle end hole 601 and the rear end hole 602. The coolant after the second division first fills the gap between the battery cell 800 and the middle longitudinal beam 600. After overflowing, the coolant is divided again, and the coolant is respectively discharged from the Z-shaped passage composed of the upper guide foam 701 and the lower guide foam 702 between the adjacent battery cells 800. The coolant flows and is discharged from top to bottom, and the discharged coolant is collected once. The coolant discharged from the middle end hole 601 is discharged into the front side beam 100 from the gap formed by the diverter baffle 300, the battery cell 800 and the foam group 700. The coolant discharged from the rear end hole 602 is discharged into the front side beam 100 from the space formed by the diverter baffle 300 and the side beam 500, so that the coolant is collected for a second time. The collected coolant is guided by the guide plate 104 in the front side beam 100 and discharged from the discharge port 103 on one side of the front side beam 100, forming a cycle.

[0050] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0051] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A power battery pack immersion cooling system, characterized in that: The invention comprises a frame body with a plurality of enclosed spaces formed by a front side beam (100), a front cross beam (200), a flow dividing baffle (300), a middle cross beam (400), a side beam (500), a middle longitudinal beam (600), a top sealing foam (801) and a bottom structural adhesive (802), wherein each space of the frame body is provided with a plurality of battery cells (800), and a foam group (700) with a flow guiding function is provided between adjacent battery cells (800) in each space.

2. The power battery pack immersion cooling system according to claim 1, characterized in that: A current collector (604) is provided at one end of the middle longitudinal beam (600), and a connecting pipeline (603) for discharging coolant is provided at one end of the current collector (604).

3. The power battery pack immersion cooling system according to claim 2, characterized in that: A middle end hole (601) is provided at the middle end of the middle longitudinal beam (600), and a rear end hole (602) is provided at one end of the middle longitudinal beam (600) away from the current collector (604). Four flow channels are provided in the middle longitudinal beam (600) from top to bottom, wherein the upper two flow channels are connected to the middle end hole (601), and the lower two flow channels are connected to the rear end hole (602).

4. The power battery pack immersion cooling system according to claim 1, characterized in that: The top sealing foam (801) and the bottom structural adhesive (802) seal the battery cell (800) and the foam group (700); the foam group (700) comprises an upper flow guiding foam (701) and a lower flow guiding foam (702) fixed on the battery cell (800); the upper flow guiding foam (701) and the lower flow guiding foam (702) form a Z-shaped flow channel.

5. The power battery pack immersion cooling system according to claim 1, characterized in that: The front cross beam (200) and the middle cross beam (400) are of equal height and width; two ends of the front cross beam (200) and the middle cross beam (400) are respectively fixed to one side of the side beam (500); two ends of the front cross beam (200) are respectively provided with a second opening (201) with a double layer opening; two ends of the middle cross beam (400) are respectively provided with a third opening (401) with a single layer opening; and an opening area of ​​the third opening (401) is half of that of the second opening (201).

6. The power battery pack immersion cooling system according to claim 5, characterized in that: A flow dividing baffle (300) is fixed between the middle partition of the second opening (201) and the third opening (401) close to one end of the middle cross beam (400).

7. The power battery pack immersion cooling system according to claim 1, characterized in that: The two ends of the front side beam (100) are provided with first openings (101), and the first opening (101) is connected to the second opening (201).

8. The power battery pack immersion cooling system according to claim 2, characterized in that: The inner cavity of the front side beam (100) is provided with a flow pipe, one side of the front side beam (100) is provided with a coolant discharge port (103), and a coolant guide plate (104) is fixed to the inner cavity of the front side beam (100) above the discharge port (103).

9. The power battery pack immersion cooling system according to claim 8, characterized in that: An insertion port (102) for fixing a connecting pipeline (603) is provided in the space enclosed by the guide plate (104).

10. A battery pack, characterized in that: The battery pack is suitable for the power battery pack immersion cooling system described in any one of claims 1-9.

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