Leakage device, battery pack and vehicle

Abstract

The invention relates to the technical field of batteries, in particular to a liquid leakage device, a battery pack and a vehicle, the liquid leakage device comprises a device body, a valve core, an elastic piece and an expansion part; a valve cavity is formed in the device body, the valve element is arranged in the valve cavity, the two ends of the valve element are provided with a first abutting portion and a second abutting portion respectively, the elastic piece and the expansion portion are arranged on the valve element in a sleeving mode, the elastic piece abuts against the first abutting portion, and the expansion portion abuts against the second abutting portion. The device body and the first abutting portion define a first containing portion containing an elastic piece, the elastic piece is compressed in the first containing portion, the second abutting portion is connected with the device body in a sealed mode through a first sealing piece, and the device body and the second abutting portion define a second containing portion containing an expansion portion. A liquid leakage hole communicated with the second accommodating part is formed in the device body; the expansion part expands after absorbing the liquid, so that the second abutting part is separated from the device body. The liquid leakage device can quickly respond when the cooling liquid leaks, is high in reliability, and improves the safety performance of the whole vehicle.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a leakage device, a battery pack and a vehicle. Background Art

[0002] As the current new energy vehicle market has increasing requirements for fast charging performance, the requirements for battery pack cooling efficiency are constantly increasing, and the number of liquid cooling plates in the corresponding battery pack is also increasing; however, when the entire vehicle is accidentally hit, the liquid cooling plate system is at risk of coolant leakage, which will cause electrical safety failure of the entire battery pack. In severe cases, the entire pack may even short-circuit, causing the vehicle to catch fire or even explode. At present, for coolant leakage in the battery pack, it is usually necessary to set an opening or drain valve at the bottom of the battery pack to discharge the leaked liquid; discharging the leaked liquid by setting an opening destroys the integrity and airtightness of the battery pack, and the existing drain valve needs to be controlled by the vehicle's control system to open and close. When the vehicle is accidentally hit, the control system often has a greater risk of failure, and the drain valve cannot be opened in time, so that the leaked liquid in the battery pack cannot be discharged, posing a serious safety hazard. Summary of the invention

[0003] In order to solve the above technical problems, the present disclosure provides a leakage device, a battery pack and a vehicle.

[0004] On the one hand, the present disclosure provides a liquid leakage device, comprising: a device body, a valve core, an elastic member and an expansion portion; a valve cavity is formed in the device body, the valve core is arranged in the valve cavity, a first abutment portion and a second abutment portion are respectively arranged at two ends of the valve core, the elastic member and the expansion portion are sleeved on the valve core, the elastic member abuts against the first abutment portion, and the expansion portion abuts against the second abutment portion; along the axial direction of the valve cavity, the device body and the first abutment portion are enclosed to form a first accommodating portion for accommodating the elastic member, the second abutment portion is sealed and connected to the device body through the first sealing member, the device body and the second abutment portion are enclosed to form a second accommodating portion for accommodating the expansion portion, and a liquid leakage hole connected to the second accommodating portion is opened on the device body.

[0005] Optionally, the second abutting portion is a circular plate structure formed on the valve core, and the second abutting portion is coaxial with the valve core.

[0006] Optionally, an abutment groove suitable for abutting with the second abutment portion is formed at one end of the device body facing the second abutment portion, and the first sealing member is arranged in the abutment groove or the first sealing member is arranged on the surface of the second abutment portion facing the abutment groove.

[0007] Optionally, a first sealing groove is formed on a surface of the abutting groove facing the second abutting portion, and the first sealing member is disposed in the first sealing groove.

[0008] Optionally, a guide portion is formed on a surface of the second abutting portion facing the second accommodating portion, and the guide portion, the valve core and the second abutting portion are combined to form a guide cavity, and the expansion portion is arranged in the guide cavity.

[0009] Optionally, the guide portion includes a plurality of guide ribs, and the plurality of guide ribs are dispersedly arranged along a ring coaxial with the valve core.

[0010] Optionally, a distance is left between the guide rib and an inner wall of the second accommodating portion.

[0011] Optionally, the first abutting portion is a pressure plate with an annular structure, and the pressure plate is sleeved on the valve core.

[0012] Optionally, a sensing portion is provided on one end of the valve core on which the first abutting portion is provided, and a sensor is provided on the device body and is located opposite to the sensing portion.

[0013] Optionally, there are multiple leakage holes, and the multiple leakage holes are spaced apart along the side wall of the second accommodating portion.

[0014] Optionally, an abutment rib is provided in the valve cavity, and the abutment rib divides the valve cavity into the first accommodating portion and the second accommodating portion.

[0015] Another aspect of the present disclosure provides a battery pack, including a shell and the above-mentioned leakage device, wherein a mounting hole is opened at the bottom of the shell, the device body is connected to the shell through the mounting hole, and at least part of the leakage hole is arranged in the shell.

[0016] Optionally, a boss is provided at one end of the device body facing the second abutting portion, the side of the boss facing the shell is suitable for abutting against the top shell, and a second sealing member is provided between the boss and the shell.

[0017] The present disclosure also provides a vehicle, comprising the above-mentioned battery pack.

[0018] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0019] The leakage device provided by the embodiment of the present disclosure is provided with a valve cavity in the device body so that the valve core can swing in the valve cavity to control the opening and closing of the leakage device. The first abutment portion and the second abutment portion are respectively provided at the first end and the second end of the valve core to enclose the first accommodating portion and the second accommodating portion with the device body, and an elastic member sleeved on the valve core is provided in the first accommodating cavity, and an expansion portion sleeved on the valve core is provided in the second accommodating cavity. When the battery pack is working normally, the elastic member is compressed in the first accommodating cavity, so that the second abutment portion is subjected to tension through the valve core, thereby enabling the second abutment portion to abut against the device body, and a first sealing member is provided between the abutment position of the second abutment portion and the device body, so that the leakage device is in a sealed state in this state; a leakage hole is provided on the second accommodating portion, so that when the battery pack leaks, the leaked cooling liquid can flow into the second accommodating cavity through the leakage hole, thereby expanding the expansion portion, and the expansion portion pushes the second abutment portion, further compresses the elastic member, so that the second abutment portion is separated from the abutment position of the device body, and the leaked cooling liquid can be discharged through the valve cavity. The leakage device can respond quickly when the coolant leaks, absorb the coolant through the expansion part to expand and open the valve body, and discharge the leaked coolant without control intervention, with high reliability, thus improving the safety performance of the whole vehicle.

[0020] The battery pack and vehicle provided by the present disclosure include the above-mentioned leakage device. Since the leakage device has the advantage of being able to quickly respond and discharge leakage without the need for control intervention, the battery pack and vehicle also have good quality in corresponding aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0023] Figure 1 It is a schematic diagram of the liquid leakage device according to an embodiment of the present disclosure;

[0024] Figure 2 An exploded view of the liquid leakage device according to an embodiment of the present disclosure;

[0025] Figure 3 A partial cross-sectional view of a battery pack in a normal working state according to an embodiment of the present disclosure;

[0026] Figure 4 A partial cross-sectional view of a battery pack when coolant leaks according to an embodiment of the present disclosure;

[0027] Figure 5 This is a schematic diagram of the coolant being discharged through the liquid leakage device according to an embodiment of the present disclosure.

[0028] Reference numerals:

[0029] 1. Liquid leakage device assembly; 9. Second abutment portion; 11. Valve core; 12. First sealing member; 13. Second sealing member; 14. Device body; 15. Expansion portion; 16. Elastic member; 17. Pressure plate; 18. Magnetic element; 19. Sensor; 21. Housing; A. Coolant. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0032] Combination Figures 1 to 4 As shown, the embodiment of the present disclosure provides a liquid leakage device, including: a device body 14, a valve core 11, an elastic member 16 and an expansion portion 15; a valve cavity is formed in the device body 14, the valve core 11 is arranged in the valve cavity, and the first abutting portion and the second abutting portion 9 are respectively arranged at both ends of the valve core 11, at least one of the first abutting portion and the second abutting portion 9 is detachable relative to the valve core 11 to facilitate the installation of the elastic member 16 and the expansion portion 15, the elastic member 16 and the expansion portion 15 are sleeved on the valve core 11, the elastic member 16 abuts against the first abutting portion, and the expansion portion 15 abuts against the second abutting portion 9; along the axial direction of the valve cavity, the device body 14 and the first abutting portion enclose a first accommodating portion for accommodating the elastic member 16, and the second abutting portion 9 is enclosed in the expansion portion 15. The side wall of an accommodating portion can be a portion of the side wall of the valve cavity, and a first abutment rib is formed on the side wall of the valve cavity. One end of the elastic member 16 abuts against the first abutment portion, and the other end abuts against the first abutment rib, so that the elastic member 16 is compressed in the first accommodating portion, and the second abutment portion 9 is sealed and connected to the device body 14 through the first sealing member 12. The device body 14 and the second abutment portion 9 are enclosed to form a second accommodating portion accommodating the expansion portion 15. Optionally, a second abutment rib is formed on the side wall of the valve cavity, and a leakage hole connected to the second accommodating portion is opened on the device body 14; the expansion portion 15 expands after absorbing liquid, and one end of the expansion portion 15 abuts against the second abutment portion 9, and the other end abuts against the second abutment rib, so that the second abutment portion 9 is separated from the device body 14.

[0033] The leakage device of this embodiment is provided with a valve cavity in the device body 14 so that the valve core 11 can swing in the valve cavity, which is used to control the opening and closing of the leakage device. The first abutment portion and the second abutment portion 9 are respectively provided at the first end and the second end of the valve core 11 to enclose the first accommodating portion and the second accommodating portion with the device body 14, and an elastic member 16 sleeved on the valve core 11 is provided in the first accommodating cavity, and an expansion portion 15 sleeved on the valve core 11 is provided in the second accommodating cavity. When the battery pack is working normally, the elastic member 16 is compressed in the first accommodating cavity, so that the second abutment portion 9 passes through The valve core 11 is subjected to tension, so that the second abutting portion 9 can abut against the device body 14, and the first sealing member 12 is set between the abutting position of the second abutting portion 9 and the device body 14, so that the leakage device is in a sealed state in this state; by setting a leakage hole on the second accommodating portion, when the battery pack leaks, the leaked coolant can flow into the second accommodating cavity through the leakage hole, so that the expansion portion 15 expands, and the expansion portion 15 pushes the second abutting portion 9, further compressing the elastic member 16, so that the second abutting portion 9 is separated from the abutting position of the device body 14, and then the leaked coolant can be discharged through the valve cavity. The leakage device can react quickly when the coolant leaks, and the expansion portion 15 absorbs the coolant to expand and open the valve body to discharge the leaked coolant, without the need for control intervention, with high reliability, and improves the safety performance of the whole vehicle.

[0034] In some embodiments, the valve core 11 is a rotating body structure, the second abutting portion is a circular plate structure formed on the valve core 11, the second abutting portion is coaxial with the valve core 11, and optionally, the diameter of the second abutting portion 9 is 2 to 5 times the diameter of the valve core 11 to form a sufficient installation plane for setting the expansion portion 15 and the first sealing member 12. By setting the second abutting portion 9 directly formed on the valve core 11, the processing and assembly costs can be reduced, and at the same time, the provision of an additional sealing member between the valve core 11 and the second abutting portion 9 can be avoided.

[0035] Further, an abutment groove suitable for abutting the second abutment portion 9 is formed at one end of the device body 14 facing the second abutment portion 9. Optionally, the depth of the abutment groove is equal to the thickness of the second abutment portion 9, so that the bottom surface of the leakage device assembly 1 forms a plane, thereby improving the flatness. The first sealing member 12 is arranged in the abutment groove or the first sealing member 12 is arranged on the surface of the second abutment portion 9 facing the abutment groove, that is, the first sealing member 12 can be arranged on the bottom wall or side wall of the abutment groove, or on the second abutment portion 9. When the battery pack works normally, the second abutment portion 9 is accommodated in the abutment groove, and the second abutment portion 9 is sealed and connected to the wall surface of the abutment groove through the first sealing member 12; when the coolant leaks, the expansion portion 15 absorbs the expansion of the coolant, pushes the second abutment portion 9 out of the abutment groove, and allows the coolant to be discharged from between the abutment groove and the second abutment portion 9.

[0036] In more detail, a first sealing groove is formed on the surface of the abutment groove facing the second abutment portion 9, and the first sealing member 12 is arranged in the first sealing groove. When the battery pack is working normally, the elastic member 16 is in a compressed state, and a thrust is applied to the first abutment portion. The thrust is transmitted to the second abutment portion 9 through the valve core 11, and then the second abutment portion 9 is pressed toward the abutment groove. Therefore, the first sealing member 12 is arranged in the first sealing groove formed on the surface of the abutment groove facing the second abutment portion 9, which has a better sealing effect. Exemplarily, the first sealing member 12 is a sealing ring with a circular or rectangular cross section, and the depth of the first sealing groove is less than the diameter of the first sealing member 12 or the thickness of the first sealing member 12.

[0037] In some optional embodiments, a guide portion is formed on one side of the second abutting portion 9 facing the second accommodating portion, and the guide portion, the valve core 11 and the second abutting portion enclose a guide cavity, and the expansion portion 15 is disposed in the guide cavity. By providing the guide cavity, the expansion portion 15 can be limited so that the expansion portion 15 can expand and contract along the axial direction of the valve core 11. Optionally, a notch is provided on the guide portion for the coolant to flow out.

[0038] More specifically, the guide portion includes a plurality of guide ribs, which are dispersedly arranged along a ring coaxial with the valve core 11. Optionally, the guide is an arc plate structure, and the curvature of the arc plate is the same as the curvature of the concentric circle of the valve core 11 where the guide ribs are arranged.

[0039] In some further embodiments, a gap is left between the guide rib and the inner wall of the second receiving portion, so that the leaked liquid flows out along the gap between the guide rib and the second receiving portion to increase the discharge volume of the leaking device. Optionally, there may be a clearance fit between the guide rib and the inner wall of the second receiving portion.

[0040] In some embodiments, the first abutting portion is a pressure plate 17 of an annular structure, and the pressure plate 17 is sleeved on the valve core 11. During assembly, the expansion portion 15 can be installed first, and after the valve core 11 and the elastic member 16 are installed in the valve cavity, the pressure plate 17 can be installed. Optionally, the pressure plate 17 is clamped with the valve core 11, and specifically, a clamping groove is provided on the valve core 11, and a clamping member suitable for cooperating with the clamping groove is provided on the side of the pressure plate 17 facing the valve core 11. In order to ensure the structural strength of the clamping groove, the diameter of the valve core 11 can be 1.1 to 2.5 times the diameter of the circular ring at the bottom of the clamping groove.

[0041] In some more detailed embodiments, a sensing part is provided on one end of the valve core 11 provided with the first abutting part. Specifically, a mounting cavity is provided on the end surface of the end of the valve core 11 provided with the first abutting part. The sensing part is provided in the mounting cavity. A sensor 19 is provided on the device body 14, which is opposite to the position of the sensing part. The sensing part can be made of magnetic material. The sensor 19 can obtain the position of the valve core 11 by detecting the distance between the sensor 19 and the magnetic material. The sensor 19 is electrically connected to the control system, so that the control system obtains a signal indicating that the battery pack is working normally or a signal indicating that the battery pack is leaking.

[0042] In other embodiments, an abutment rib is provided in the valve cavity, and the abutment rib divides the valve cavity into a first accommodating portion and a second accommodating portion. Specifically, the abutment rib can separate the valve cavity into a first abutment portion and a second abutment portion 9 along the axial direction of the valve core 11. The length of the second accommodating portion in the axial direction of the valve core 11 can be 0.5 to 3 times the length of the first accommodating portion, and the length of the device body 14 is 1.5 to 8 times the length of the second accommodating portion.

[0043] The disclosed embodiment further provides a battery pack, including a shell 21 and the above-mentioned leakage device, the bottom of the shell 21 is provided with a mounting hole, it should be noted that the above-mentioned bottom of the shell 21 refers to the part of the shell 21 closer to the ground, which can be either the bottom plate or the bottom of the side plate of the shell 21, the device body 14 is sealed and connected to the shell 21 through the mounting hole, and at least part of the leakage hole is arranged in the shell 21. Specifically, the side of the device body 14 facing away from the valve cavity is threadedly connected to the side wall of the mounting hole, and the device body 14 and the side wall of the mounting hole can also be interference fit or the device body 14 and the shell 21 can be snap-fitted.

[0044] In some more detailed embodiments, a boss is provided at one end of the device body 14 facing the second abutting portion, and the diameter of the boss may be 0.5 to 2 times the axial length of the device body 14, and the thickness of the boss may be 1.2 to 5 times the thickness of the second abutting portion 9. The diameter of the boss may be 1 to 3 times the diameter of the second abutting portion 9. When the diameters of the boss and the second abutting portion 9 are similar but not sufficient to provide an abutting groove, a first sealing groove may be provided on a surface of the boss facing the second abutting portion 9, and a side of the boss facing the shell 21 is suitable for abutting with the top shell 21, and a second sealing member 13 is provided between the boss and the shell 21, and specifically, a second sealing groove may be provided on a surface of the boss facing the shell 21. Exemplarily, the second sealing member 13 is a sealing ring having a circular or rectangular cross-section, and the depth of the second sealing groove is less than the diameter of the second sealing member 13 or the thickness of the second sealing member 13. As shown in FIG. Figure 5As shown, when the coolant A leaks and the leakage device is opened, the seal between the boss and the second abutting portion 9 is lost, the elastic member 16 is compressed 1.2 to 3 times along the axial direction of the valve core 11, and correspondingly, the expansion portion 15 expands 1.2 to 3 times along the axial direction of the valve core 11.

[0045] Exemplarily, the liquid leakage device further comprises a nut which can be threadably matched with the device body 14 , and by tightening the nut, the housing 21 around the mounting hole can be pressed between the boss and the nut.

[0046] The disclosed embodiments further provide a vehicle including the above-mentioned battery pack.

[0047] The battery pack and vehicle provided by the present disclosure include the above-mentioned leakage device. Since the leakage device has the advantage of being able to quickly respond and discharge leakage without the need for control intervention, the battery pack and vehicle also have good quality in corresponding aspects.

[0048] In the description of the embodiments of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the structure or device referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present disclosure.

[0049] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0050] The above are only specific embodiments of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A liquid leakage device, characterized in that: include: A device body, a valve core, an elastic member, an expansion portion and a first sealing member; a valve cavity is formed in the device body, the valve core is arranged in the valve cavity, a first abutting portion and a second abutting portion are respectively arranged at both ends of the valve core, the elastic member and the expansion portion are sleeved on the valve core, the elastic member abuts against the first abutting portion, and the expansion portion abuts against the second abutting portion; along the axial direction of the valve cavity, the device body and the first abutting portion are enclosed to form a first accommodating portion for accommodating the elastic member, the second abutting portion is sealed and connected to the device body through the first sealing member, the device body and the second abutting portion are enclosed to form a second accommodating portion for accommodating the expansion portion, and a leakage hole connected to the second accommodating portion is opened on the device body.

2. The liquid leakage device according to claim 1, characterized in that: The valve core is a rotating body structure, the second abutting portion is a circular plate structure formed on the valve core, and the second abutting portion is coaxial with the valve core.

3. The liquid leakage device according to claim 2, characterized in that: An abutting groove suitable for abutting with the second abutting portion is formed at one end of the device body facing the second abutting portion, and the first sealing member is arranged in the abutting groove or on the surface of the second abutting portion facing the abutting groove.

4. The liquid leakage device according to claim 3, characterized in that: A first sealing groove is formed on a surface of the abutting groove facing the second abutting portion, and the first sealing member is disposed in the first sealing groove.

5. The liquid leakage device according to claim 2, characterized in that: A guide portion is formed on a surface of the second abutting portion facing the second accommodating portion. The guide portion, the valve core and the second abutting portion are combined to form a guide cavity. The expansion portion is disposed in the guide cavity.

6. The liquid leakage device according to claim 4, characterized in that: The guide portion includes a plurality of guide ribs, and the plurality of guide ribs are dispersedly arranged along a ring coaxial with the valve core.

7. The liquid leakage device according to claim 4, characterized in that: A distance is left between the guide rib and the inner wall of the second accommodation portion.

8. The liquid leakage device according to claim 1, characterized in that: The first abutting portion is a pressure plate of an annular structure, and the pressure plate is sleeved on the valve core.

9. The liquid leakage device according to claim 1, characterized in that: A sensing portion is disposed on one end of the valve core where the first abutting portion is disposed, and a sensor is disposed on the device body and is opposite to the sensing portion.

10. The liquid leakage device according to claim 1, characterized in that: The device body is a rotating body structure, the number of the leakage holes is multiple, and the multiple leakage holes are arranged at intervals along the side wall of the second accommodating part.

11. The liquid leakage device according to any one of claims 1 to 10, characterized in that: An abutment rib is disposed in the valve cavity, and the abutment rib divides the valve cavity into the first accommodating portion and the second accommodating portion.

12. A battery pack, characterized in that: It comprises a shell and a liquid leakage device as claimed in any one of claims 1 to 11, wherein a mounting hole is provided at the bottom of the shell, the device body is sealed and connected to the shell through the mounting hole, and at least part of the liquid leakage hole is arranged in the shell.

13. The battery pack according to claim 12, characterized in that: A boss is provided at one end of the device body facing the second abutting portion, and a side of the boss facing the shell is suitable for abutting against the top shell, and a second sealing member is provided between the boss and the shell.

14. A vehicle, characterized in that: Comprising a battery pack as claimed in claim 12 or 13.

Images