CN219163669U

CN219163669U - Liquid discharge valve for power battery pack

Info

Publication number: CN219163669U
Application number: CN202223184075.9U
Authority: CN
Inventors: 张云; 王祺; 李炳健; 徐斌; 丁荣华; 秦嫦莺; 袁傲
Original assignee: Panasian Microvent Tech Jiangsu Corp
Current assignee: Panasian Microvent Tech Jiangsu Corp
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-06-09
Anticipated expiration: 2032-11-30

Abstract

The utility model discloses a liquid discharge valve for a power battery pack, which comprises a valve body and a valve cover arranged above the valve body, wherein a liquid inlet hole is formed in the circumferential direction of the valve body, a plurality of guide plates are arranged on the valve cover at intervals along the center, a moisture absorption expansion body is embedded between the inner sides of the guide plates, the outer sides of the guide plates are arranged in a clearance mode with the valve body, guide grooves are formed in the outer sides of the guide plates, liquid flowing in the liquid inlet hole flows into the moisture absorption expansion body through the clearance of the guide plates, and the moisture absorption expansion body expands to jack up the valve cover, so that the guide grooves are communicated with an opening part between the valve cover and the valve body, and a drainage channel is formed. Through the mode, the liquid discharge valve for the power battery pack optimizes the position of the liquid discharge flow channel and the expansion space of the hygroscopic expansion body, ensures that the space of the liquid discharge flow channel is not influenced under the expansion state of the hygroscopic expansion body, ensures the normal realization of the liquid discharge function, and has a simple structure, safety and reliability.

Description

Liquid discharge valve for power battery pack

Technical Field

The utility model relates to the field of explosion-proof valves, in particular to a liquid discharge valve for a power battery pack.

Background

The cooling system is used for the power lithium ion battery pack for the vehicle, and the power lithium ion battery pack can maintain the better working temperature of the power lithium ion battery by cooling or heating the power lithium ion battery, so that the running efficiency of the power lithium ion battery pack is improved, and the service life of the power lithium ion battery pack is prolonged. At present, the thermal management of the power lithium ion battery pack system for the vehicle can be mainly divided into four types, namely natural cooling, air cooling, liquid cooling and direct cooling.

Liquid cooling uses a cooling fluid (such as ethylene glycol) as a heat exchange medium. There are typically multiple different heat exchange circuits, e.g., the Chevrovian has a radiator circuit, an air conditioning circuit, a PTC circuit, and the battery management system should and switches according to thermal management policies.

However, under the high-temperature oxidation of glycol in cold liquid, hydroxyl groups are acidified, the glycol is oxidized into glycollic acid and then oxidized into oxalic acid after working and circulated at 80 ℃ below zero and 90 ℃ below zero, the oxalic acid and glycol oxalic acid can corrode equipment and liquid cooling pipes, especially the liquid cooling pipes are welded by aluminum foils or copper foils, the surface defects of welding seams or liquid cooling pipes are easily corroded to leak, and if the leaked glycol cooling liquid cannot be discharged out of a battery pack in time, the battery pack can be caused to fail, short circuit or thermal runaway and other phenomena.

Existing drain valves perform the function of draining liquid through a liquid-absorbent swelling material, such as patent CN20220874209.0. However, the liquid absorbing and expanding material structure of the liquid draining valve is unreasonable, and the liquid absorbing and expanding material expands in all directions after liquid absorbing and expanding, so that the water guiding groove on the surface of the liquid absorbing and expanding material deforms to influence the water draining effect. After the liquid absorption expansion material is dried, the position of the liquid absorption expansion material can change, the expansion space is unreasonable in structural design, the liquid drainage flow passage is unreasonable in design, and the expansion material is unreasonable in shape selection.

Disclosure of Invention

The utility model mainly solves the technical problem of providing the liquid discharge valve for the power battery pack, which optimizes the position of the liquid discharge flow passage and the expansion space of the hygroscopic expansion body, ensures that the space of the liquid discharge flow passage is not influenced under the expansion state of the hygroscopic expansion body, ensures the normal realization of the liquid discharge function, and has simple structure, safety and reliability.

In order to solve the technical problems, the utility model adopts a technical scheme that: the utility model provides a flowing back valve for power battery package, includes the valve body and locates the valve gap of valve body top, the inlet opening has been seted up to the circumference of valve body, be provided with a plurality of guide plates along the center interval on the valve gap, inlay between the guide plate inboard and have the hygroscopic expansion body, be the clearance setting between the outside of guide plate and the valve body to the outside of guide plate has the guiding gutter, the liquid that the inlet opening flowed in flows into the hygroscopic expansion body through the clearance of guide plate, hygroscopic expansion body inflation jack-up the valve gap, thereby make the opening position intercommunication between guiding gutter and valve gap and the valve body and form the drainage passageway.

In a preferred embodiment of the present utility model, the baffle is an arc plate disposed in a vertical direction and protruding toward the center of the valve cover, the outer side surface of the baffle integrally forms a concave-shaped diversion groove, and the inner side surface of the baffle clamps the moisture absorption expansion body.

In a preferred embodiment of the present utility model, the lower end of the valve body is provided with a positioning plate, and the upper end of the hygroscopic expansion body is in contact with the valve cover, and the lower end is in contact with the positioning plate.

In a preferred embodiment of the utility model, a push rod is further arranged in the valve body, a connecting column is arranged in the center of the bottom of the valve cover, a threaded hole is formed in the connecting column, the upper end of the push rod penetrates through the locating plate and is connected in the threaded hole, and a reset spring is further connected between the push rod and the locating plate.

In a preferred embodiment of the present utility model, the lower end of the valve cover is provided with a plurality of baffles, and the baffles connect the upper ends of the guide plates arranged at intervals to form a surrounding structure.

In a preferred embodiment of the utility model, the upper end of the valve body is provided with a step structure, the outer side of the bottom surface of the valve cover is attached to the step structure, the enclosing structure is attached to the inner side of the step structure, an inner sealing ring is arranged in the step structure, and the inner sealing ring and the bottom surface of the valve cover form a sealing surface.

In a preferred embodiment of the utility model, an outer sealing ring is arranged on the outer side of the valve body, a fastening nut is connected to the valve body in a threaded manner, and a notch corresponding to the liquid inlet hole is formed in the fastening nut.

In a preferred embodiment of the present utility model, the moisture-absorbing expansion body is formed by stacking or integrally forming a plurality of expansion sheets, and the expansion sheets are made of sodium polyacrylate fiber/polyethylene terephthalate fiber mixed fiber or sodium polyacrylate fiber/polytetrafluoroethylene fiber mixed fiber.

In a preferred embodiment of the present utility model, the thickness of the sodium polyacrylate fiber/polyethylene terephthalate fiber mixed fiber is 0.1-3mm, and the sodium polyacrylate fiber in the sodium polyacrylate fiber/polyethylene terephthalate fiber mixed fiber felt accounts for 10% -100%.

In a preferred embodiment of the present utility model, the thickness of the sodium polyacrylate fiber/polytetrafluoroethylene fiber mixed fiber is 0.1-5mm, and the sodium polyacrylate fiber accounts for 10% -100% of the sodium polyacrylate fiber/polytetrafluoroethylene fiber mixed fiber.

The beneficial effects of the utility model are as follows: the liquid discharge valve for the power battery pack is characterized in that the flow guide groove is arranged on the flow guide plate of the valve cover, the flow guide groove is communicated with the opening part between the valve cover and the valve body, and a flow discharge channel is formed, and is separated from the moisture absorption channel of the moisture absorption expansion body, so that the influence on the flow discharge channel after the moisture absorption expansion body expands is reduced.

According to the drain valve for the power battery pack, the hygroscopic expansion body is limited through the valve body, the valve cover and the guide plate, the hygroscopic expansion body cannot occupy the space of the drain channel after imbibition and expansion, the expansion space is reasonable, and the drain channel is ensured to be in an unblocked state.

According to the drain valve for the power battery pack, the hygroscopic expansion body is formed by stacking the expansion sheets, the expansion sheets are made of sodium polyacrylate fiber/polyethylene terephthalate fiber mixed fibers or sodium polyacrylate fiber/polytetrafluoroethylene fiber mixed fibers, and the materials and the structures of the hygroscopic expansion body are optimized.

Drawings

For a clearer description of the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:

FIG. 1 is a schematic view of a preferred embodiment of a drain valve for a power cell pack according to the present utility model;

FIG. 2 is a front cross-sectional view of a drain valve for a power battery pack;

FIG. 3 is a schematic perspective view of a valve body;

FIG. 4 is a schematic perspective view of a valve cover;

fig. 5 is a perspective cross-sectional view of the valve cover and the liquid absorbent expansion body;

the components in the drawings are marked as follows: 1. the valve comprises a valve body, 11, a liquid inlet hole, 12, a connecting plate, 13, a step structure, 2, a valve cover, 21, a guide plate, 211, a guide groove, 22, a connecting column, 3, a fastening nut, 31, a notch, 4, a moisture absorption expansion body, 41, an expansion sheet, 5, a push rod, 6, a return spring, 7, an inner sealing ring, 8 and an outer sealing ring.

Description of the embodiments

The technical solutions in the embodiments of the present utility model will be clearly and completely described below. The structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure, and are not intended to limit the scope of the utility model, since any modification, variation in proportions, or adjustment of the size, etc. of the structures, proportions, etc. should be considered as falling within the spirit and scope of the utility model, without affecting the effect or achievement of the objective. Also, the terms "upper", "lower", "left", "right", "middle", and the like are used herein for descriptive purposes only and are not intended to limit the scope of the utility model for modification or adjustment of the relative relationships thereof, as they are also considered within the scope of the utility model without substantial modification to the technical context.

Referring to fig. 1 to 5, a drain valve for a power battery pack includes a valve body 1 and a valve cover 2 disposed above the valve body 1.

The circumference of the valve body 1 is provided with liquid inlet holes 11, the liquid outlet holes 11 are waist-shaped holes, and the number of the liquid outlet holes can be a plurality of liquid outlet holes. An outer sealing ring 8 is arranged on the outer side of the valve body 1, and a fastening nut 3 is connected to the valve body 1 in a threaded manner. The fastening nut 3 is provided with a recess 31 corresponding to the liquid inlet 11. The fastening nut 3 is used for installing the liquid discharge valve on the power battery pack (the specific installation mode is determined according to the structure of the power battery pack, and details are not repeated here), the notch 31 corresponds to the liquid inlet 11, and the fastening nut 3 is prevented from shielding the liquid inlet from being communicated with the power battery pack. The lower end of the valve body 1 is provided with a positioning plate.

A plurality of guide plates 21 are arranged on the valve cover 2 at intervals along the center, the guide plates 21 are uniformly distributed around the middle of the valve cover 2 at intervals, the number of the guide plates is 2, 3, 4, 5, 6, 7, 8 or more, the specific number of the guide plates is set according to the requirements of a liquid discharge valve, and the best embodiment of the guide plates 21 is shown in the attached drawing. The moisture absorption expansion body 4 is embedded between the inner sides of the guide plates 21. The upper end of the hygroscopic expansion body 4 is contacted with the valve cover 2, and the lower end is contacted with the locating plate. The hygroscopic expansion body 4 is confined between the valve body 1 and the valve cover 2. When the water-absorbing expansion body 4 is installed, the water-absorbing expansion body 4 is correspondingly installed on the valve cover 2, and the circumferential part of the water-absorbing expansion body 4 is contacted with the guide plate 21 and blocked by the guide plate 21. Next, the valve cover 2 is installed in the valve body 1, and the lower end of the hygroscopic expansion body 4 is just in contact with the positioning plate after the installation, so that the hygroscopic expansion body 4 is vertically restrained in position by the valve cover 2 and the positioning plate.

The outside of the deflector 21 is arranged with a gap with the valve body 1, and the outside of the deflector 21 is provided with a deflector groove 211. The baffle 21 is an arc plate which is arranged along the vertical direction and protrudes towards the center of the valve cover 2, the outer side surface of the baffle 21 integrally forms a concave-shaped diversion trench 211, and the inner side surface of the baffle 21 clamps the moisture absorption expansion body 4. The liquid flowing in from the liquid inlet hole 11 flows into the hygroscopic expansion body 4 through the gap of the guide plate 21, and the hygroscopic expansion body 4 expands to jack up the valve cover 2, so that the guide groove 211 is communicated with the opening part between the valve cover 2 and the valve body 1, and a drainage channel is formed. Because there is the clearance between guide plate 21 and valve body 1, when power battery's coolant liquid leaks, after the coolant liquid flows into valve body 1 from feed liquor hole 11, the coolant liquid can flow to hygroscopic expansion body 4 along the clearance between each guide plate 21, and hygroscopic expansion body 4 begins the inflation at this moment, and hygroscopic expansion body 4 vertical direction can jack up valve gap 2, can form the opening part between valve body 1 and the valve gap 2. Since the guide plate 21 is arc-shaped, and the two wings of the guide plate 21 just guide the hygroscopic expansion body 4, the hygroscopic expansion body 4 expands from the gap between the guide plates 21 towards the valve body 1, so that the hygroscopic expansion body 4 cannot invade the inside of the guide groove 211 outside the guide plate 21 due to the limitation of the guide plate 21 when expanding in the circumferential direction, a liquid flowing space is always reserved between the guide groove 211 and the valve body 1, and the cooling liquid can flow out of the valve body 1 along the guide groove 211 from the opening part between the valve cover 2 and the valve body 1 by matching with the concave guide groove 211 structure. Through the spacing of guide plate 21, valve gap 2 and connecting plate 12, the space of the expansion deformation of hygroscopic expansion body 4 is rationally and strictly restricted, on the basis of satisfying the requirement that hygroscopic expansion body 4 warp and jack up valve gap 2, ensures that the unblocked of guiding gutter 211 can not be influenced in the deformation of hygroscopic expansion body 4 circumference, ensures that the drain passageway is in the intercommunication state all the time, ensures that the flowing back effect is stable. After the liquid discharge is completed or the hygroscopic expansion body 4 is naturally dried, the hygroscopic expansion body 4 is restored, and the limiting structure can ensure that the position of the hygroscopic expansion body 4 does not change after the restoration.

A push rod 5 is also arranged in the valve body 1. The center of valve gap 2 bottom is equipped with spliced pole 22, has offered the screw hole in the spliced pole 22. The upper end of the ejector rod passes through the positioning plate and is connected in the threaded hole. A return spring 6 is also connected between the ejector rod 5 and the positioning plate. After the valve cover 2 is installed in place, the pull rod passes through the connecting plate 12 and is in threaded connection with the threaded hole of the connecting column 22, downward pulling force is applied to the valve cover 2 through the reset spring 6, the liquid discharge valve is ensured to be sealed between the valve cover 2 and the valve body 1 in a normal state, external air is prevented from entering the power battery pack from the valve body 1 due to poor sealing effect between the valve body 1 and the valve cover 2, and the influence of the external air on the power battery pack is reduced.

The upper end of the valve body 1 is provided with a step structure 13, the outer side of the bottom surface of the valve cover 2 is stuck on the step structure 13, an inner sealing ring 7 is arranged in the step structure 13, and the inner sealing ring 7 and the bottom surface of the valve cover 2 form a sealing surface. When the valve cover 2 moves upwards, the guide plate 21 is ensured to stably move up and down at the position of the step structure 13 due to the action of the step structure 13, so that the center of the valve cover 2 is prevented from being deviated in the vertical direction. The inner seal ring 7 seals between the valve body 1 and the valve cover 2, mainly to prevent outside air from entering the inside of the valve body 1. The enclosing structure 24 also plays a role in covering and fixing the upper end of the moisture-absorbing expansion body 4, and ensures that the upper end of the moisture-absorbing expansion body 4 can be expanded and deformed upwards after being expanded so as to push the valve cover 2 to move upwards.

The moisture absorption expansion body 4 is formed by stacking or integrally forming a plurality of expansion sheets 41, and the expansion sheets 41 are made of sodium polyacrylate fiber/polyethylene terephthalate fiber mixed fiber or sodium polyacrylate fiber/polytetrafluoroethylene fiber mixed fiber. The number ratio of the two different swelling sheets 41 is set according to the liquid absorption rate and the liquid absorption swelling rate of the ethylene glycol/water mixture. The thickness of the sodium polyacrylate fiber/polyethylene glycol terephthalate fiber mixed fiber is 0.1-3mm, and the proportion of the sodium polyacrylate fiber in the sodium polyacrylate fiber/polyethylene glycol terephthalate fiber mixed fiber felt is 10-100%. The thickness of the sodium polyacrylate fiber/polytetrafluoroethylene fiber mixed fiber is 0.1-5mm, and the sodium polyacrylate fiber accounts for 10% -100% of the sodium polyacrylate fiber/polytetrafluoroethylene fiber mixed fiber.

The hygroscopic expansion body 4 can also be integrally prepared and molded by adopting a sodium polyacrylate fiber/polyethylene terephthalate fiber mixed fiber and a sodium polyacrylate fiber/polytetrafluoroethylene fiber mixed fiber, and the ratio of the two materials is set according to the liquid absorption rate and the liquid absorption expansion rate of the ethylene glycol/water mixed liquid.

Compared with the prior art, the liquid discharge valve for the power battery pack optimizes the position of the liquid discharge flow passage and the expansion space of the hygroscopic expansion body, ensures that the space of the liquid discharge flow passage is not influenced under the expansion state of the hygroscopic expansion body, ensures the normal realization of the liquid discharge function, and has simple structure, safety and reliability.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims

1. The utility model provides a flowing back valve for power battery package, includes the valve body and locates the valve gap of valve body top, its characterized in that, the inlet opening has been seted up to the circumference of valve body, be provided with a plurality of guide plates along the central interval on the valve gap, inlay between the guide plate inboard and be the moisture absorption inflation body, be the clearance setting between the outside of guide plate and the valve body to the outside of guide plate has the guiding gutter, the liquid that the inlet opening flowed in flows into the moisture absorption inflation body through the clearance of guide plate, and the inflation of moisture absorption inflation body is jacked the valve gap, thereby makes the opening position intercommunication between guiding gutter and valve gap and the valve body and forms the drainage passageway.

2. The drain valve for a power battery pack according to claim 1, wherein the deflector is an arc plate disposed in a vertical direction and protruding toward a center of the valve cover, an outer side surface of the deflector integrally forms a concave-shaped deflector groove, and an inner side surface of the deflector clamps the hygroscopic expansion body.

3. The drain valve for a power battery pack according to claim 2, wherein the valve body has a positioning plate at a lower end thereof, the upper end of the hygroscopic expansion body is in contact with the valve cover, and the lower end is in contact with the positioning plate.

4. The drain valve for the power battery pack according to claim 3, wherein a push rod is further arranged in the valve body, a connecting column is arranged in the center of the bottom of the valve cover, a threaded hole is formed in the connecting column, the upper end of the push rod penetrates through the positioning plate and is connected in the threaded hole, and a reset spring is further connected between the push rod and the positioning plate.

5. The drain valve for power battery pack according to any one of claims 1 to 4, wherein the lower end of the valve cover is provided with a plurality of baffles, and the baffles connect the upper ends of the guide plates arranged at intervals to form a surrounding structure.

6. The drain valve for power battery pack according to claim 5, wherein the upper end of the valve body has a stepped structure, the outer side of the bottom surface of the valve cover is attached to the stepped structure, the enclosing structure is attached to the inner side of the stepped structure, an inner sealing ring is arranged in the stepped structure, and the inner sealing ring forms a sealing surface with the bottom surface of the valve cover.

7. The drain valve for the power battery pack according to claim 6, wherein an outer sealing ring is arranged on the outer side of the valve body, a fastening nut is connected to the valve body in a threaded manner, and a notch corresponding to the liquid inlet hole is formed in the fastening nut.