Liquid-cooled battery pack

Abstract

The utility model discloses a liquid-cooled battery pack which comprises a liquid-cooled plate, an inner cavity for a cooling medium to flow is formed in the liquid-cooled plate, and a liquid inlet for the cooling medium to flow in and a liquid outlet for the cooling medium to flow out are formed in one side of the liquid-cooled plate; the liquid cooling plate is mounted on the tray, and one side of the tray is provided with a groove for embedding the liquid inlet and the liquid outlet; the battery module is fixedly mounted on the liquid cooling plate; the heat-conducting structural adhesive is positioned between the battery module and the liquid cooling plate; the upper cover is provided with a containing cavity defined by a peripheral wall and a top, the tray is covered with the upper cover, the battery module is wrapped by the containing cavity, the liquid inlet and the liquid outlet are wrapped by the upper cover and the tray, and the liquid inlet and the liquid outlet are exposed out of the liquid-cooled battery pack. According to the liquid-cooled battery pack provided by the utility model, the liquid-cooled plate is arranged above the tray, and the battery module is arranged on the liquid-cooled plate, so that the liquid inlet and the liquid outlet of the liquid-cooled plate can be directly led out of the liquid-cooled battery pack more conveniently during installation and maintenance.

Description

Technical Field

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

[0002] Liquid-cooled battery packs are a battery packaging technology that uses liquid cooling media to effectively manage battery temperature. They are widely used in electric vehicles, energy storage systems, and other high-performance battery applications. Compared with traditional air-cooling systems, liquid cooling systems can more efficiently remove the large amount of heat generated by the battery during the charging and discharging process, ensuring that the battery pack remains within the ideal temperature range, thereby improving the safety and stability of the battery system, slowing down the aging of the battery, and extending the overall service life and cycle life of the battery pack.

[0003] Chinese patent CN208460918U discloses a new type of liquid-cooled battery pack, which is achieved by providing at least one group of cooling medium flow channels at the bottom of the battery pack body, and each cooling medium flow channel is provided with a liquid inlet and a liquid outlet. The cooling medium enters from the liquid inlet, circulates in the cooling medium flow channel, and finally flows out from the liquid outlet. However, the liquid cooling plate and battery module of the battery pack are installed inside the tray, which is inconvenient for installation and subsequent maintenance; at the same time, when the battery pack is used for energy storage or vehicle-mounted, the docking joints of the liquid inlet and the liquid outlet are mostly at the front end of the battery pack, and the liquid inlet and the liquid outlet are led out of the battery pack from the front end, and water pipes need to be designed for transfer, so the space utilization rate of the battery pack is low. Utility Model Content

[0004] The utility model aims to provide a liquid-cooled battery pack in which a cooling plate and a battery module are installed above a tray.

[0005] The utility model discloses a liquid-cooled battery pack, comprising:

[0006] The liquid cooling plate has an inner cavity for the cooling medium to flow, and one side of the plate is provided with a liquid inlet for the cooling medium to flow in and a liquid outlet for the cooling medium to flow out;

[0007] A tray, the liquid cooling plate is mounted on the tray, and one side of the tray is provided with a groove for the liquid inlet and the liquid outlet to be embedded;

[0008] A battery module is fixedly mounted on the liquid cooling plate;

[0009] Thermally conductive structural adhesive, located between the battery module and the liquid cooling plate;

[0010] The upper cover has a receiving cavity formed by a peripheral wall and a top, and is covered on the tray. The receiving cavity encloses the battery module. The upper cover and the tray enclose the liquid inlet and the liquid outlet. The liquid inlet and the liquid outlet are exposed to the liquid-cooled battery pack.

[0011] Furthermore, the upper cover is also provided with a maintenance window for facilitating maintenance of the battery module.

[0012] Furthermore, the liquid cooling plate has two layers, the upper layer is flat and close to the battery module; the lower layer is provided with a flow channel for the cooling medium to flow.

[0013] Furthermore, a protrusion is provided on one side of the tray that is close to the liquid cooling plate, and a supporting structure close to the protrusion is provided at a corresponding position of the lower layer of the liquid cooling plate.

[0014] Furthermore, the top of the protrusion has a plane, and the supporting structure has a plane against the protrusion; the protrusion and the supporting structure are bonded by structural adhesive.

[0015] Furthermore, the tray and the liquid cooling plate are provided with a heat insulating medium to avoid the gap between the protrusion and the supporting structure.

[0016] Furthermore, the support structure is formed by stamping a tray, and the back side of the support structure is fixedly connected to the bottom cross beam at a corresponding position, and the bottom cross beam is provided with a reinforcing structure adapted to the protrusion, and the reinforcing structure is partially embedded in the back side of the protrusion.

[0017] Furthermore, the liquid cooling plate is fixedly connected to a module mounting block, and the module mounting block is provided with a first connecting portion and a second connecting portion; the liquid cooling plate is fixedly connected to the tray via the first connecting portion, and the battery module is fixedly connected to the liquid cooling plate via the second connecting portion.

[0018] Furthermore, the second connecting portion is a through hole penetrating the module mounting block, the tray is provided with a corresponding hole, the bolts pass through the battery module, the liquid cooling plate, and the tray, and are fixed on the bottom surface of the tray with floating nuts.

[0019] Furthermore, the floating nut is provided with a sealing cover.

[0020] The utility model provides a liquid-cooled battery pack, in which a liquid cooling plate is installed above a tray, and a battery module is installed on the liquid cooling plate, so that installation is more convenient, and subsequent maintenance only requires opening the upper cover to repair the entire battery module; the liquid inlet and the liquid outlet of the liquid cooling plate directly lead to the liquid-cooled battery pack, and there is no need to design water pipes for switching, thereby improving the space utilization of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 An exploded view of a liquid-cooled battery pack in one embodiment provided in the present application;

[0022] Figure 2 It is a schematic diagram of the structure of a tray and a liquid cooling plate in the prior art;

[0023] Figure 3 A schematic diagram of the structure of the upper layer of a liquid cooling plate in one embodiment provided in the present application;

[0024] Figure 4 A schematic structural diagram of the lower layer of a liquid cooling plate in an embodiment provided in the present application;

[0025] Figure 5 A schematic diagram of the structure of a tray in an embodiment provided in this application;

[0026] Figure 6 A schematic diagram of the structure of a liquid cooling plate and a heat insulating medium in an embodiment provided in the present application;

[0027] Figure 7 A schematic diagram of the structure of the outer side of a tray in an embodiment provided in the present application;

[0028] Figure 8 This is a partial schematic cross-sectional view of the sealing area of ​​the tray and the liquid cooling plate in one embodiment provided in the present application.

[0029] The reference numerals in the figures are described as follows:

[0030] 10. Liquid cooling plate; 11. Liquid inlet; 12. Liquid outlet; 13. Groove; 14. Flow channel; 15. Support structure; 16. Module mounting block; 17. First connecting part; 18. Second connecting part; 19. Bottom crossbeam; 20. Tray; 21. Protrusion; 22. Reinforcement rib; 23. Mounting hole; 24. Heat insulation medium; 25. Reinforcement structure; 26. Floating nut; 27. Sealing cover; 28. Bottom bolt; 30. Battery module; 40. Thermal conductive structural adhesive; 50. Upper cover; 51. Peripheral wall; 52. Top; 53. Maintenance window. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] It should be noted that when a component is referred to as being "connected" to another component, it may be directly connected to the other component or there may be a central component. When a component is referred to as being "disposed on" another component, it may be directly disposed on the other component or there may be a central component at the same time.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0034] like Figure 1 As shown, a liquid-cooled battery pack provided by an embodiment of the present application includes a liquid cooling plate 10, a tray 20, a battery module 30, a thermally conductive structural adhesive 40 and an upper cover 50. The liquid cooling plate 10 has an inner cavity for the flow of a cooling medium, and one side of the inner cavity is provided with a liquid inlet 11 for the flow of the cooling medium and a liquid outlet 12 for the flow of the cooling medium. The liquid cooling plate 10 is installed on the upper side of the tray 20, and one side of the tray 20 is provided with a groove 13 for the liquid inlet 11 and the liquid outlet 12 to be embedded. The battery module 30 is fixedly installed on the upper side of the liquid cooling plate 10. The thermally conductive structural adhesive 40 is located between the battery module 30 and the liquid cooling plate 10. The upper cover 50 has a receiving cavity formed by a peripheral wall 51 and a top 52, which is covered on the tray 20, and the receiving cavity encloses the battery module 30. The upper cover 50 and the tray 20 enclose the liquid inlet 11 and the liquid outlet 12, and the liquid inlet 11 and the liquid outlet 12 are exposed to the liquid-cooled battery pack.

[0035] The battery module 30 is installed on the liquid cooling plate 10 coated with thermal conductive structural adhesive 40 by bolts. The liquid cooling plate 10 and the tray 20 are fixed by thermal conductive structural adhesive 40 and bolts. The tray 20 is pressed with the liquid cooling plate 10 by rivet nuts on all sides, and the upper cover 50 is fixedly connected to the tray 20 by bolts.

[0036] like Figure 2 As shown, in the liquid-cooled battery pack in the prior art, the liquid cooling plate 10 is installed inside the tray 20, and the liquid inlet 11 and the liquid outlet 12 of the liquid cooling plate 10 need to add additional water pipe adapters to lead out the liquid-cooled battery pack. At the same time, the battery module (not shown in the figure) is installed inside the tray 20, which is inconvenient to install and maintain. At the same time, the tray 20 is provided with a flange connected to the upper cover (not shown in the figure), and the existence of the flange reduces the internal space of the battery pack. The arrangement of electrical components (high and low voltage modules), fire protection modules, etc. is limited, and the operating space is limited during the subsequent installation and production of the battery pack, which reduces the production efficiency.

[0037] In one embodiment, if Figure 1 As shown, the upper cover 50 is also provided with a maintenance window 53 for facilitating maintenance of the battery module. The battery module 30 has four modules (two in parallel and thirteen in series or one in parallel and twenty-six in series). One end of the battery module 30 is a low-voltage sampling module, which is more prone to failure than other parts of the battery module 30. A maintenance window 53 is provided at the corresponding end of the upper cover 50, so that maintenance can be performed without removing the upper cover 50.

[0038] In one embodiment, if Figure 3-5 As shown, the liquid cooling plate 10 has two layers, the upper layer is flat and abuts against the battery module 30, and the lower layer is provided with a flow channel 14 for the flow of cooling medium. The upper surface of the liquid cooling plate 10 adopts a solution of spraying or pasting an insulating film to increase the insulation and pressure resistance of the battery pack. The flow channel 14 of the lower layer of the liquid cooling plate 10 is formed by stamping, and the upper and lower layers are connected by brazing to form a whole. A protrusion 21 is provided on the side of the tray 20 abutting against the liquid cooling plate 10, and a support structure 15 abutting against the protrusion 21 is provided at the corresponding position of the lower layer of the liquid cooling plate 10. Such a setting is used to support the liquid cooling plate 10 to bear the weight of the battery module 30 and prevent the liquid cooling plate 10 from deforming. The tray 20 is stamped to form a protrusion 21 facing the liquid cooling plate 10, and the support structure 15 is a boss abutting against the protrusion 21 formed by stamping the lower layer of the liquid cooling plate 10. The top of the protrusion 21 has a flat surface, the support structure 15 has a flat surface against the protrusion 21, and the protrusion 21 and the support structure 15 are bonded by structural adhesive. Such a setting plays a role in supporting the liquid cooling plate 10, and also plays a role in fixing the tray 20 and the liquid cooling plate 10 together to strengthen the connection. The tray 20 is designed with longitudinal reinforcing ribs 22 in the middle area and on both sides to increase the rigidity of the tray 20 in the longitudinal direction and prevent the tray 20 from being deformed under pressure. The mounting holes 23 around the tray are installed with rivet nuts for press-fit assembly with the liquid cooling plate 10.

[0039] like Figure 6 The tray 20 and the liquid cooling plate 10 avoid the gap between the protrusion 21 and the supporting structure 15, and are provided with a heat insulating medium 24. The heat insulating medium 24 is a sealing foam, and the heat insulating medium 24 is provided to increase the heat preservation effect of the battery pack. Figure 7 As shown, the bottom crossbeam 19 is fixedly connected to the corresponding position of the back side of the support structure 15, and the bottom crossbeam 19 is provided with a reinforcing structure 25 having the same shape as the protrusion 21, and the reinforcing structure 25 is partially embedded in the back side of the protrusion 21. The bottom crossbeam 19 not only improves the width direction strength of the tray 20, but also supports the liquid cooling plate 10.

[0040] like Figure 4 As shown, the liquid cooling plate 10 is fixedly connected to a module mounting block 16, and the module mounting block 16 is provided with a first connecting portion 17 and a second connecting portion 18. Figure 8As shown, the liquid cooling plate 10 is fixedly connected to the tray 20 via the first connecting portion 16, and the battery module 30 is fixedly connected to the liquid cooling plate 10 via the second connecting portion 18. The module mounting block 16 is brazed on the liquid cooling plate 10, and the first connecting portion 16 and the tray 20 are fixedly connected via the bottom bolts 28. The second connecting portion 18 is a through hole that penetrates the module mounting block 16, and the tray 20 is provided with a corresponding hole. The bolts pass through the battery module 30, the liquid cooling plate 10, and the tray 20, and are fixed on the bottom surface of the tray 20 with floating nuts 26. The solution of using floating nuts 26 at the bottom of the tray 20 can effectively absorb the dimensional tolerance of the battery module 30, making it easier to install, improving the qualified rate of the battery module 30, and reducing the production cost of the entire liquid-cooled battery package. As shown Figure 7 As shown, the floating nut 26 is provided with a sealing cover 27 to enhance air tightness.

Claims

1. A liquid-cooled battery pack, characterized in that: include: The liquid cooling plate has an inner cavity for the cooling medium to flow, and one side of the plate is provided with a liquid inlet for the cooling medium to flow in and a liquid outlet for the cooling medium to flow out; A tray, the liquid cooling plate is mounted on the tray, and one side of the tray is provided with a groove for the liquid inlet and the liquid outlet to be embedded; A battery module is fixedly mounted on the liquid cooling plate; Thermally conductive structural adhesive, located between the battery module and the liquid cooling plate; The upper cover has a receiving cavity formed by a peripheral wall and a top, and is covered on the tray. The receiving cavity encloses the battery module. The upper cover and the tray enclose the liquid inlet and the liquid outlet. The liquid inlet and the liquid outlet are exposed to the liquid-cooled battery pack.

2. A liquid-cooled battery pack according to claim 1, characterized in that: The upper cover is also provided with a maintenance window for facilitating maintenance of the battery module.

3. The liquid-cooled battery pack according to claim 1, characterized in that: The liquid cooling plate has two layers, the upper layer is flat and close to the battery module; the lower layer is provided with a flow channel for the cooling medium to flow.

4. A liquid-cooled battery pack according to claim 3, characterized in that: A protrusion is provided on one side of the tray that abuts against the liquid cooling plate, and a supporting structure that abuts against the protrusion is provided at a corresponding position of the lower layer of the liquid cooling plate.

5. A liquid-cooled battery pack according to claim 4, characterized in that: The top of the protrusion has a plane, and the supporting structure has a plane against the protrusion; the protrusion and the supporting structure are bonded by structural adhesive.

6. A liquid-cooled battery pack according to claim 5, characterized in that: The tray and the liquid cooling plate are arranged with a heat insulating medium avoiding the gap between the protrusion and the supporting structure.

7. The liquid-cooled battery pack according to claim 5, characterized in that: The support structure is formed by stamping a tray, and the back side of the support structure is fixedly connected to the bottom cross beam at a corresponding position, and the bottom cross beam is provided with a reinforcing structure adapted to the protrusion, and the reinforcing structure is partially embedded in the back side of the protrusion.

8. The liquid-cooled battery pack according to claim 1, characterized in that: The liquid cooling plate is fixedly connected to a module mounting block, and the module mounting block is provided with a first connecting portion and a second connecting portion; the liquid cooling plate is fixedly connected to the tray via the first connecting portion, and the battery module is fixedly connected to the liquid cooling plate via the second connecting portion.

9. The liquid-cooled battery pack according to claim 8, characterized in that: The second connecting portion is a through hole that penetrates the module mounting block, and the tray is provided with a hole corresponding thereto. Bolts pass through the battery module, the liquid cooling plate, and the tray, and are fixed on the bottom surface of the tray with floating nuts.

10. The liquid-cooled battery pack according to claim 9, characterized in that: The floating nut is provided with a sealing cover.

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