Battery pack and vehicle

Abstract

The utility model discloses a battery pack and a vehicle, and the battery pack comprises a liquid cooling cabin which is internally provided with a cooling liquid pipeline interface assembly; a battery cell group is arranged in the battery cell cabin, and the liquid cooling cabin is located on the first side of the battery cell cabin; and the liquid storage cavity is arranged below the liquid cooling cabin and the battery cell cabin, the liquid storage cavity is communicated with the liquid cooling cabin, and the liquid storage cavity is used for storing the cooling liquid flowing in from the liquid cooling cabin. According to the battery pack provided by the utility model, the liquid storage cavity is designed in the battery pack, so that under the condition of leakage of the cooling liquid, the leaked cooling liquid can be discharged into the liquid storage cavity and cannot be in contact with the battery cell module or the electrical assembly, the safety risk is avoided, the overall sealing performance of the battery pack cannot be damaged, and the stability of the internal environment of the battery pack is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicles, and in particular to a battery pack and a vehicle. Background Art

[0002] Currently, battery pack systems are equipped with liquid cooling systems to ensure that the batteries are at the appropriate temperature under high and low temperature operating conditions, thereby ensuring the charge and discharge power and service life. The current liquid cooling systems are composed of liquid cooling plates, liquid cooling pipes and interfaces. The liquid cooling system and the battery pack or electrical components cannot be completely insulated and isolated. When the coolant leaks at the pipes or interfaces of the liquid cooling system, the coolant may contact the battery pack and / or high-voltage electrical components and cause safety risks. In the prior art, there is a method of opening a drain hole on the battery pack case to directly discharge the leaked coolant to the outside of the battery pack to prevent the leaked coolant from contacting the battery cell group and / or electrical components. However, this will cause the inside of the battery pack to be directly connected to the external environment, destroying the overall sealing of the battery pack. Utility Model Content

[0003] The embodiment of the present utility model provides a battery pack to solve the problem in the prior art that leakage and drainage of coolant from the battery pack destroy the overall sealing of the battery pack.

[0004] One aspect of the present invention provides a battery pack, including:

[0005] A liquid cooling chamber, wherein a coolant pipeline interface assembly is provided in the liquid cooling chamber;

[0006] A battery cell compartment, wherein a battery cell group is arranged in the battery cell compartment, and the liquid cooling compartment is located on a first side of the battery cell compartment;

[0007] A liquid storage cavity is provided below the liquid cooling compartment and the battery cell compartment, the liquid storage cavity is communicated with the liquid cooling compartment, and is used to store the coolant flowing in from the liquid cooling compartment.

[0008] In some embodiments, the battery pack includes:

[0009] The frame includes a first frame, a second frame, a third frame, and a fourth frame, wherein the first frame is fixedly connected to a first end of the third frame and a first end of the fourth frame, the second frame is fixedly connected to a second end of the third frame and a second end of the fourth frame, and the first frame includes a groove, and the coolant pipe interface assembly is disposed in the groove;

[0010] An upper cover, the upper cover is arranged above the frame and is sealed to the upper surface of the frame;

[0011] A liquid cooling plate is provided on the lower side of the frame, the edge of the liquid cooling plate is sealed and connected to the lower side of the frame, and the battery cell group is provided on the liquid cooling plate;

[0012] A bottom guard plate, the bottom guard plate is arranged below the liquid cooling plate and has a gap between the bottom guard plate and the liquid cooling plate, and the edge of the bottom guard plate is sealed with the lower surface of the frame;

[0013] Among them, the liquid cooling chamber includes the groove; the battery cell chamber includes the space surrounded by the frame; the liquid storage cavity includes the space between the bottom guard plate and the liquid cooling plate, and the first through hole passes through the bottom surface of the groove and the cold plate and connects the liquid cooling chamber and the liquid storage cavity.

[0014] In some embodiments, the battery pack further includes a second through hole, which passes through the bottom surface of the groove and the liquid cooling plate and connects the liquid cooling compartment and the liquid storage cavity, and the first through hole and the second through hole are spaced apart.

[0015] In some embodiments, the liquid cooling pipe interface assembly includes a cooling liquid interface and a cooling plate interface, the first through hole is close to the cooling liquid interface, and the second through hole is close to the cooling plate interface.

[0016] In some embodiments, the first through hole and the second through hole are circular through holes with a diameter D, 10 mm ≤ D ≤ 30 mm.

[0017] In some embodiments, a retaining rib is provided on the bottom surface of the groove, and the first through hole and the second through hole are located on both sides of the retaining rib.

[0018] In some embodiments, a sealant is provided on the inner sides of the first through hole and the second through hole or is coated with a sealant.

[0019] In some embodiments, a plurality of thermal insulation sheets are provided between the liquid cooling plate and the bottom guard plate, the plurality of thermal insulation sheets are adhered to the bottom surface of the liquid cooling plate, and gaps are provided between the plurality of thermal insulation sheets.

[0020] In some embodiments, the battery pack further includes a liquid detection component, which is disposed in the liquid cooling chamber and is used to detect leakage of the cooling liquid.

[0021] Another embodiment of the present invention provides a vehicle, comprising the battery pack according to any one of the above embodiments.

[0022] Compared with the prior art, the utility model has the following advantages:

[0023] The battery pack provided in the embodiment of the present invention has a liquid storage chamber designed inside the battery pack. In the event of a coolant leak, the leaked coolant will be discharged into the liquid storage chamber and will not come into contact with the battery cell modules or electrical components, thereby avoiding safety risks and not destroying the overall sealing of the battery pack, thereby ensuring the stability of the internal environment of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a partial structural diagram of a battery pack provided by an embodiment of the present utility model;

[0025] Figure 2 This is a schematic structural diagram of a battery pack frame provided by an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the liquid cooling plate structure of a battery pack provided in one embodiment of the present invention.

[0027] Figure 4 It is a partial structural cross-sectional diagram of a battery pack provided by one embodiment of the present invention.

[0028] Figure 5 It is a partial structural diagram of a battery pack provided in one embodiment of the present utility model.

[0029] Figure 6 It is a partial structural cross-sectional diagram of a battery pack provided by one embodiment of the present invention.

[0030] Figure 7 It is a partial structural cross-sectional diagram of a battery pack provided by one embodiment of the present invention.

[0031] Description of the accompanying drawings:

[0032] 1. Battery pack; 10. Liquid cooling chamber; 101. Liquid cooling pipe interface assembly; 1011. Cooling liquid interface; 1012. Liquid cooling plate interface; 11. Cell compartment; 111. Cell assembly; 12. Liquid storage chamber; 13. Electrical compartment; 20. Frame; 21. First frame; 211. Groove; 22. Second frame; 221. Receiving groove; 23. Third frame; 24. Fourth frame; 30. Upper cover; 40. Liquid cooling plate; 401. Flat plate; 402. Flow channel plate; 50. Bottom guard plate; 60. First through hole; 70. Second through hole; 80. Rib; 90. Insulation sheet; 100. Liquid leakage detection assembly DETAILED DESCRIPTION

[0033] The following description sets forth many specific details to facilitate a thorough understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the scope of the present invention. Therefore, the present invention is not limited to the specific implementations disclosed below.

[0034] refer to Figure 1 As shown, the present invention first discloses a battery pack 1, which includes a liquid cooling compartment 10, a battery cell compartment 11, a liquid storage chamber 12, and an electrical compartment 13. The liquid cooling compartment 10 is provided with a coolant pipeline interface assembly 101, the battery cell compartment 11 is provided with a battery cell group 111, and the electrical compartment 13 is provided with a battery pack management system assembly and a high-voltage controller assembly (not shown). The liquid cooling compartment 10 is located on one side of the battery cell compartment 11, and the electrical compartment 13 is located on the other side of the battery cell compartment 11. The liquid storage chamber 12 is located below the liquid cooling chamber 10 and the battery cell chamber 11. The liquid storage chamber 12 is connected to the liquid cooling chamber 10. If the coolant pipe interface assembly 101 in the liquid cooling chamber 10 is damaged and the coolant leaks into the liquid cooling chamber 10, the leaked coolant in the liquid cooling chamber 10 will quickly flow into the liquid storage chamber 12 below. The liquid storage chamber 12 has enough space to accommodate the leaked coolant, so that the leaked coolant will not accumulate in the liquid cooling chamber 10 and contact electrical components or enter the battery cell chamber 11 and the electrical chamber 13, thereby avoiding causing electrical short circuits or high-voltage hydrogen explosions. Therefore, safety issues caused by coolant leakage in the liquid cooling chamber 10 are avoided. The interior of the battery pack 1 is sealed from the external environment. The liquid storage chamber 12 is arranged inside the battery pack 1 and will not affect the overall sealing of the battery pack 1.

[0035] Combine Figure 1-7 As shown, the battery pack 1 includes a frame 20, which includes a first frame 21, a second frame 22, a third frame 23, and a fourth frame 24. The first frame 21 is fixedly connected to the first end of the third frame 23 and the first end of the fourth frame 24, and the second frame 22 is fixedly connected to the second end of the third frame 23 and the second end of the fourth frame 24. The first frame 21 and the second frame 22 are metal die-castings, specifically aluminum alloy die-castings. The third frame 23 and the fourth frame 24 are metal profiles, specifically aluminum alloy profiles. The first frame 21, the second frame 22, the third frame 23, and the fourth frame 24 are fixedly connected together by welding or riveting. The use of aluminum alloy for the first frame 21, the second frame 22, the third frame 23, and the fourth frame 24 ensures the lightweight design of the battery pack 1. At the same time, the frame 20 of the battery pack 1 has sufficient protective strength to ensure the safety of the battery cell group 111 in the battery pack 1 in the event of an impact.

[0036] The first frame 21 has a groove 211, and the liquid cooling pipe interface assembly 101 is disposed in the groove 211. The second frame 22 has a receiving groove 221, and the electrical assembly is disposed in the receiving groove 221.

[0037] The battery pack 1 includes an upper cover 30, which is sealed to the upper surface of the frame 20. Specifically, the edge of the upper cover 30 has a flange, and bolt holes are arranged in the flange area. It is connected to the frame 20 by bolts. A sealing strip is provided between the flange of the upper cover 30 and the upper surface of the frame 20 or a sealant is applied.

[0038] The battery pack 1 also includes a liquid cooling plate 40, which is positioned below the frame 20. The edge of the liquid cooling plate 30 is sealed and bolted to the lower surface of the frame 20. A sealing strip or sealant is provided between the edge of the liquid cooling plate 40 and the lower surface of the frame 20. The liquid cooling plate 40 can also be secured to the lower surface of the frame 20 by welding or riveting.

[0039] The liquid cooling plate 40 includes a flat plate 401 and a flow channel plate 402 . The flow channel plate 402 includes a concave flow channel. The flat plate 401 and the flow channel plate 402 are bonded together. The liquid cooling plate 40 includes a flow channel area and a non-flow channel area.

[0040] The battery pack 1 also includes a bottom guard plate 50, which is positioned below the cold plate 40. The edge of the bottom guard plate 50 is sealed against the lower surface of the frame 20 and secured together by bolts. A sealing strip or sealant is provided between the edge of the bottom guard plate 50 and the lower surface of the frame 20. The edge of the bottom guard plate 50 and the lower surface of the frame 20 can also be secured together by welding or riveting.

[0041] In one embodiment, the lower surface of the frame 20 forms a step, the edge of the liquid cooling plate 40 overlaps the upper step surface, and the edge of the bottom guard plate 50 overlaps the lower step surface, with a gap between the liquid cooling plate 40 and the bottom guard plate 50. In another embodiment, the bottom guard plate 50 includes a recessed portion, the edge of the liquid cooling plate 40 overlaps the inner side of the lower surface of the frame 20, and the edge of the bottom guard plate 50 overlaps the outer side of the lower surface of the frame 20, with a gap between the liquid cooling plate 40 and the bottom guard plate 50. The space between the liquid cooling plate 40 and the bottom guard plate 50 comprises the space between the recessed flow channels of the liquid cooling plate 40 and the gap between the liquid cooling plate 40 and the bottom guard plate 50. The volume of the space between the liquid cooling plate 40 and the bottom guard plate 50 is greater than the volume of coolant used to cool the battery pack in the vehicle. The liquid storage chamber 12 comprises the space between the liquid cooling plate 40 and the bottom guard plate 50, and the space between the liquid cooling plate 40 and the bottom guard plate 50 constitutes the space of the liquid storage chamber 12.

[0042] In the above embodiment, the space between the groove 211 and the upper cover 30 constitutes the liquid cooling chamber 10 of the battery pack 1. The space between the frame 20, the upper cover 30, and the liquid cooling plate 40 constitutes the battery pack 1's cell compartment 11. The space between the accommodating groove 221 and the upper cover 30 constitutes the electrical compartment 13. The space between the liquid cooling plate 40 and the bottom guard plate 50 constitutes the battery pack 1's liquid storage chamber 12. To allow coolant leaking from the liquid cooling chamber 10 to flow into the liquid storage chamber 12, a first through-hole 60 is provided on the bottom surface of the groove 211, extending through the bottom surface of the groove 211 and the non-flow channel area of ​​the liquid cooling plate 40. The first through-hole 60 connects the liquid cooling chamber 10 and the liquid storage chamber 12. If coolant leaks from the liquid cooling chamber 10, the leaked coolant flows out of the liquid cooling chamber 10 through the first through-hole on the bottom surface of the groove 211 and into the liquid storage chamber 12, preventing it from accumulating in the liquid cooling chamber 10 or entering the cell compartment 11 or the electrical compartment 13.

[0043] Furthermore, a second through hole 70 is provided on the bottom surface of the groove 211, penetrating the bottom surface of the groove 211 and the non-flow channel area of ​​the liquid cooling plate 40. The second through hole 70 also connects the liquid cooling chamber 10 with the liquid storage chamber 12. The second through hole 70 is spaced a certain distance from the first through hole 60. The coolant pipeline structural assembly 101 includes a coolant interface 1011 and a liquid cooling plate interface 1012. The coolant interface 1011 is connected to the vehicle's coolant circulation system, and the coolant enters the coolant pipeline of the battery pack 1 through the coolant interface. The liquid cooling plate interface 1012 is connected to the coolant pipeline, and the coolant enters the flow channel of the liquid cooling plate 40 through the liquid cooling plate interface 1012. The first through hole 60 is close to the coolant interface 1011, and the second through hole 70 is close to the liquid cooling plate interface 1012. If the liquid cooling pipeline is damaged or the connection at the liquid cooling pipeline interface is loose, causing coolant leakage, the leaked coolant will flow into the liquid storage chamber 12 through the first through hole 60 and the second through hole 70. The leaked coolant will flow into the liquid storage chamber 12 through the through-hole closest to the leak location. Furthermore, since the internal environment of the battery pack 1 is a sealed environment, when a large amount of leaked coolant flows into the liquid storage chamber 12 through the first through-hole 60 and the second through-hole 70, the air originally in the liquid storage chamber 12 needs to be discharged. One of the first through-hole 60 or the second through-hole 70 can serve as an exhaust hole. When the coolant is discharged, the air in the liquid storage chamber 12 will enter the liquid cooling chamber 10 through the first through-hole 60 or the second through-hole 70, thereby not reducing the discharge rate of the leaked coolant.

[0044] Furthermore, the first through hole 60 and the second through hole 70 are circular holes, and the diameters of the first through hole 60 and the second through hole 70 are D, wherein 10 mm ≤ D ≤ 30 mm.

[0045] Furthermore, sealants are provided on the inner sides of the first through hole 60 and the second through hole 70 or coated with sealant, which can prevent the coolant from entering the gap between the groove bottom surface 211 and the liquid cooling plate 40 and then entering the battery cell compartment 11 .

[0046] Furthermore, a retaining rib 80 is provided on the bottom surface of the groove in the liquid cooling chamber, and the first through hole 60 and the second through hole 70 are located on both sides of the retaining rib 80. The setting of the retaining rib 80 can prevent the coolant from entering the liquid storage chamber 12 from the first through hole 60 and the second through hole 70 at the same time when a large amount of coolant leaks, resulting in poor exhaust and affecting the coolant discharge speed.

[0047] In one embodiment, insulation material is provided between the liquid cooling plate 40 and the bottom guard plate 50. Specifically, it can be multiple insulation sheets 90. The insulation sheets 90 are attached to the bottom surface of the liquid cooling plate 40, with spaces between the multiple insulation sheets 90. Cooling liquid can flow through the spaces between the insulation sheets 90. Specifically, the insulation sheets 90 are microporous foamed polypropylene sheets and / or vacuum insulation panels.

[0048] In one embodiment, the battery pack 1 further includes a leakage detection assembly 100, which is connected to the battery management system and vehicle control system of the battery pack 1. The leakage detection assembly 100 is used to detect coolant leakage in the liquid cooling compartment 10 and transmit the coolant leakage signal to the battery management system and the vehicle control system. After receiving the cooling leakage signal, the vehicle control system will control the stop of coolant delivery to the battery pack 1, thereby reducing the leakage of coolant in the liquid cooling compartment 10 and further ensuring that the leaked coolant does not enter the battery cell compartment 11 or the electrical compartment 12. The leakage detection assembly 100 is a water immersion sensor, including a resistive or photoelectric water immersion sensor. The leakage detection assembly 100 can be set on the bottom surface of the groove 211 or on the side wall of the groove 211 near the bottom surface.

[0049] It should be noted that although the present invention is disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

Claims

1. A battery pack, characterized in that: The battery pack includes: A liquid cooling chamber, wherein a coolant pipeline interface assembly is provided in the liquid cooling chamber; A battery cell compartment, wherein a battery cell group is arranged in the battery cell compartment, and the liquid cooling compartment is located on a first side of the battery cell compartment; A liquid storage cavity is provided below the liquid cooling compartment and the battery cell compartment, the liquid storage cavity is communicated with the liquid cooling compartment, and is used to store the coolant flowing in from the liquid cooling compartment.

2. The battery pack according to claim 1, wherein: The battery pack includes: The frame includes a first frame, a second frame, a third frame, and a fourth frame, wherein the first frame is fixedly connected to a first end of the third frame and a first end of the fourth frame, the second frame is fixedly connected to a second end of the third frame and a second end of the fourth frame, and the first frame includes a groove, and the coolant pipe interface assembly is disposed in the groove; An upper cover, which is arranged above the frame and is sealed to the upper surface of the frame; A liquid cooling plate is provided on the lower side of the frame, the edge of the liquid cooling plate is sealed and connected to the lower side of the frame, and the battery cell group is provided on the liquid cooling plate; A bottom guard plate, the bottom guard plate is arranged below the liquid cooling plate and has a gap between the bottom guard plate and the liquid cooling plate, and the edge of the bottom guard plate is sealed with the lower surface of the frame; Among them, the liquid cooling chamber includes the groove; the battery cell chamber includes the space surrounded by the frame; the liquid storage cavity includes the space between the bottom guard plate and the liquid cooling plate, and the first through hole passes through the bottom surface of the groove and the cold plate and connects the liquid cooling chamber and the liquid storage cavity.

3. The battery pack according to claim 2, wherein: It also includes a second through hole, which passes through the bottom surface of the groove and the liquid cooling plate and connects the liquid cooling chamber and the liquid storage cavity. The first through hole and the second through hole are arranged at intervals.

4. The battery pack according to claim 3, wherein: The coolant pipeline interface assembly includes a coolant external interface, a coolant interface, and a liquid cooling plate interface. The first through hole is close to the coolant interface, and the second through hole is close to the liquid cooling plate interface.

5. The battery pack according to claim 4, characterized in that: The first through hole and the second through hole are circular through holes with a diameter D, 10 mm ≤ D ≤ 30 mm.

6. The battery pack according to claim 5, characterized in that: A retaining rib is provided on the bottom surface of the groove, and the first through hole and the second through hole are located on both sides of the retaining rib.

7. The battery pack according to claim 3, characterized in that: The inner sides of the first through hole and the second through hole are provided with sealing members or coated with sealant.

8. The battery pack according to claim 2, wherein: A plurality of heat-insulating sheets are arranged between the liquid cooling plate and the bottom guard plate. The plurality of heat-insulating sheets are adhered to the bottom surface of the liquid cooling plate, and there are intervals between the plurality of heat-insulating sheets.

9. The battery pack according to claim 1, wherein: The battery pack further includes a liquid detection component, which is disposed in the liquid cooling chamber and is used to detect whether the coolant is leaking.

10. A vehicle, characterized in that: A battery pack comprising the battery pack according to any one of claims 1 to 9.

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