Explosion-proof valve and battery pack

Abstract

The utility model discloses an anti-explosion valve and a battery pack, and the anti-explosion valve comprises a shell, an anti-explosion valve core, an anti-explosion valve core and an anti-explosion valve core, and the moisture absorption part is arranged in the accommodating cavity. According to the anti-explosion valve disclosed by the utility model, the moisture absorption piece is arranged in the shell, so that the problem of condensation in the battery pack is solved, external humid air is prevented from entering the battery pack, the humidity in the battery pack during normal delivery is ensured, the anti-explosion valve is convenient to replace, and the anti-explosion valve can be replaced in a damaged state or a thin film damaged state, so that parts are more flexible to replace; under the condition that other parts in the battery pack are ensured to be normal, the explosion-proof valve can be disassembled to dehumidify the interior of the battery pack, and a new available explosion-proof valve can be replaced in a normal-temperature and low-humidity environment to maintain a low-humidity state in the battery pack.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to an explosion-proof valve and a battery pack. Background Art

[0002] It is pointed out in the relevant technology that the air under natural conditions is composed of a small amount of dust, water vapor and absolutely dry air. The amount of water vapor that the air can hold is proportional to the ambient temperature, that is, the higher the ambient temperature, the more water vapor the air can hold. The so-called dew point temperature refers to the highest temperature at which condensation occurs in air with a specific humidity. If air with high humidity and relatively high temperature encounters a solid surface with a relatively low temperature (lower than the dew point temperature of the air under these conditions), condensation will occur, and a certain amount of liquid water will be produced on the surface of related equipment components.

[0003] Take power equipment as an example. At the bottom of power equipment (such as switch cabinets, ring network cabinets, and screen cabinets) is a cable trench. The moisture in the cable trench continues to rise from the equipment cable room channel. When the moisture encounters the top plate, terminals and other metal and plastic components inside the equipment, due to the low surface temperature of the components, the moisture is precipitated in the form of liquid water at the cold and heat exchange interface, and condensation occurs. When the liquid water mixes with the dust inside the equipment, a corresponding conductive channel is generated, which in turn affects the electrical insulation of the equipment, converting the area that should not be conductive into a normal conductive area.

[0004] For example, once the mixed dust condensation adheres to the top of the terminal box, when the dew gathers a certain weight, it will drip down onto the exposed working components inside (such as the wiring terminals), causing a pathway to form between the two poles of the metal components, causing the components to short-circuit and burn out, and lose their normal function; for example, if the mixed dust condensation directly adheres to the wiring terminals, a conductive channel that did not originally exist will be generated, causing confusion in the logic pulses, and then causing power short circuits, failure of electronic components and other faults. In more serious cases, it may cause serious accidents such as fires and explosions.

[0005] There are also many condensation problems in the battery pack of new energy vehicles. This is the result of the explosion-proof valve waterproof and breathable membrane at the shell allowing gas to flow inside and outside the battery pack. As one of the safety components of the battery pack, the explosion-proof valve is bidirectionally ventilated, balances the pressure inside and outside the battery pack, and provides emergency pressure relief protection. On the one hand, the existence of the explosion-proof valve is to provide a quick outlet for pressure relief when the internal battery module undergoes a sudden change, such as thermal runaway, to maximize the safety of other components of the electric vehicle; on the other hand, it is to balance the internal and external pressures of the battery pack to prevent the battery pack from bulging when the shell moves from the normal use environment temperature and pressure conditions to the high altitude, low temperature and low pressure environment, causing the battery pack seal to fail, and the upper shell or the cold plate used as the upper cover to undergo irreversible deformation, affecting the normal use function. The function of the explosion-proof valve cannot be ignored, but its structure and functional characteristics still have the possibility of further improvement, so that it can not only have the original main function of pressure relief, but also solve the condensation problem and pressure balance problem inside the battery pack.

[0006] According to the mechanism of condensation (humidity and temperature difference), we can know that by destroying the condensation formation conditions such as temperature difference and humidity, we can fundamentally eliminate the occurrence of condensation. If any of the formation conditions is destroyed, condensation will not occur. The ambient temperature varies a lot in different seasons and regions. Therefore, it is difficult to control the constant temperature in the battery pack without adding an active temperature control device, that is, the temperature difference is inevitable. However, humidity control is relatively easy. In a closed space, the total amount of liquid and gas in the pack is relatively fixed, and it is difficult for humid air outside the pack to enter the pack, which greatly reduces the condensation problem. Utility Model Content

[0007] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes an explosion-proof valve, which can maintain a low humidity state inside a battery pack.

[0008] The utility model also provides a battery pack having the explosion-proof valve.

[0009] According to the first aspect of the utility model, the explosion-proof valve comprises: a shell having a containing cavity formed therein; and a hygroscopic member disposed in the containing cavity.

[0010] According to the explosion-proof valve of the utility model, a moisture absorbing component is arranged in the outer shell, which solves the problem of condensation inside the battery pack, avoids the entry of external humid air, ensures the humidity inside the pack when leaving the factory normally, and is easy to replace. The explosion-proof valve can be replaced when it is damaged or the film is destroyed, making the replacement of parts more flexible. When other internal parts are ensured to be normal, the explosion-proof valve can be disassembled to dehumidify the inside of the battery pack, and a new available explosion-proof valve can be replaced in a normal temperature and low humidity environment to maintain the low humidity state inside the pack.

[0011] In some embodiments, the housing includes a shell and a cover, the shell is formed in a cylindrical shape, the accommodating cavity is formed in the shell, and the cover is disposed at one end of the shell and covers an open side of the accommodating cavity.

[0012] In some embodiments, a moisture-proof hole is formed at the other end of the shell, and the moisture-proof hole penetrates the shell in the thickness direction of the shell.

[0013] In some embodiments, the moisture-proof holes include a plurality of holes, and the plurality of moisture-proof holes are arranged at intervals on the end surface of the other end of the shell.

[0014] In some embodiments, the cover is threadedly connected to the shell.

[0015] In some embodiments, the explosion-proof valve further includes: a sealing member, wherein the sealing member is disposed between the cover body and the shell body and is used to seal the moisture absorbing member.

[0016] In some embodiments, the absorbent member is silica gel particles, vermiculite, calcium carbonate particles or shaped fibers.

[0017] In some embodiments, the sealing member is an aluminum-plastic film or a PET film.

[0018] The battery pack according to the second aspect of the utility model comprises the explosion-proof valve according to the first aspect of the utility model.

[0019] According to the battery pack of the utility model, by providing the explosion-proof valve of the first aspect mentioned above, the problem of condensation inside the battery pack is solved, the entry of external humid air is avoided, the humidity inside the pack is ensured when leaving the factory normally, the failure risk of components such as electrical and electronic circuits inside the pack is reduced, the corrosion problem of metal parts inside the pack is reduced, and the safe service life of the entire battery pack is improved.

[0020] Furthermore, the battery pack also includes: a side beam, and the explosion-proof valve is arranged on the side beam and connected to the side beam.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of a battery pack according to an embodiment of the utility model;

[0023] Figure 2 yes Figure 1 A schematic front view of a battery pack shown in FIG.

[0024] Figure 3 yes Figure 1 A schematic diagram of a left side view of a battery pack shown in FIG.

[0025] Figure 4 yes Figure 1 A schematic diagram of a right side view of a battery pack shown in FIG.

[0026] Figure 5 yes Figure 1 A bottom view of the battery pack shown in FIG.

[0027] Figure 6 yes Figure 1 A schematic top view of a battery pack shown in FIG.

[0028] Figure 7 yes Figure 1 A schematic back view of the battery pack shown in FIG.

[0029] Figure 8 yes Figure 1 A schematic front view of the explosion-proof valve shown in FIG.

[0030] Fig. 9 yes Figure 1 The left side schematic diagram of the explosion-proof valve shown in FIG.

[0031] Fig.10 yes Figure 1 Schematic diagram of a top view of the explosion-proof valve shown in FIG.

[0032] Reference numerals:

[0033] 100. battery pack; 1. explosion-proof valve; 11. shell; 111. moisture absorption hole; 12. cover; 2. side beam. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0035] First, refer to Figure 1-Figure 10 A battery pack 100 according to an embodiment of the second aspect of the utility model is briefly described. The battery pack 100 includes an explosion-proof valve 1 according to an embodiment of the first aspect of the utility model.

[0036] The battery pack 100 according to the embodiment of the utility model comprises: a side beam 2 and an explosion-proof valve 1 according to the embodiment of the first aspect of the utility model, wherein the explosion-proof valve 1 is arranged on the side beam 2 and connected to the side beam 2. Specifically, a mounting hole is formed on the side beam 2, and the mounting hole penetrates the side beam 2 in the thickness direction of the side beam 2. The explosion-proof valve 1 is arranged in the mounting hole, and an adhesive can be applied at the connection position between the explosion-proof valve 1 and the mounting hole, and the explosion-proof valve 1 can be connected to the side beam 2 of the battery pack 100 by heat curing, natural curing, ultraviolet light curing, etc., and the connection strength can also be strengthened by bolting. As a result, the battery pack 100 has a simple structure and is easy to assemble and maintain.

[0037] According to the battery pack 100 of the embodiment of the utility model, the explosion-proof valve 1 of the above-mentioned first aspect embodiment is provided, thereby solving the problem of condensation inside the battery pack 100, avoiding the entry of external humid air, ensuring the humidity inside the pack when leaving the factory normally, reducing the failure risk of components such as electrical and electronic circuits in the pack, reducing the occurrence of corrosion problems of metal parts in the pack, and improving the safe service life of the entire battery pack 100.

[0038] In addition, the explosion-proof valve 1 can be dismantled and replaced by local heating, freezing, or coating with a disintegrating agent.

[0039] Reference below Figure 8-Figure 10 An explosion-proof valve 1 according to an embodiment of the first aspect of the utility model is described.

[0040] like Figure 8-10 As shown, the explosion-proof valve 1 according to the first embodiment of the utility model includes: a shell and a moisture absorbing member.

[0041] Specifically, a accommodating cavity is formed in the outer shell, and the moisture absorbent is arranged in the accommodating cavity, thereby solving the problem of condensation inside the battery pack 100, avoiding the entry of external humid air, ensuring the humidity inside the pack when leaving the factory normally, reducing the failure risk of components such as electrical and electronic circuits in the pack, reducing the occurrence of corrosion problems of metal parts in the pack, and improving the safe service life of the entire battery pack 100.

[0042] According to the explosion-proof valve 1 of the embodiment of the utility model, a moisture-absorbing component is arranged in the outer shell, which solves the problem of condensation inside the battery pack 100, avoids the entry of external humid air, ensures the humidity inside the pack when leaving the factory, and is easy to replace. The explosion-proof valve 1 can be replaced when it is damaged or the film is damaged, making the replacement of parts more flexible. When other internal parts are ensured to be normal, the explosion-proof valve 1 can be disassembled to dehumidify the inside of the battery pack 100, and a new explosion-proof valve 1 can be replaced in a normal temperature and low humidity environment to maintain a low humidity state inside the pack.

[0043] In some embodiments of the present invention, Figure 8As shown, the housing includes a shell 11 and a cover 12. The shell 11 is formed in a cylindrical shape, a receiving cavity is formed in the shell 11, and the cover 12 is arranged at one end of the shell 11 and covers the open side of the receiving cavity. Therefore, the structure of the housing is simple and easy to assemble.

[0044] Optionally, the housing 11 may be a circular cylinder or a rectangular cylinder.

[0045] Preferably, the shell 11 is a circular cylinder, which has higher adaptability, lower requirements on the size processing of the side beam 2, and is easy to assemble.

[0046] Furthermore, the material of the housing 11 can be plastic, metal, or other strong composite solid materials. A material with lower cost, such as plastic, is preferred, which is in line with the development intention of flexible replacement of parts. The explosion-proof valve 1 made of metal has higher strength and better durability, and can be used for automobile out-of-the-box configuration, and the plastic parts can be replaced later.

[0047] In some embodiments of the utility model, a moisture-proof hole is formed at the other end of the shell 11, and the moisture-proof hole penetrates the shell 11 in the thickness direction of the shell 11. Thus, the moisture-proof hole is provided for the interaction between the air in the bag and the dry hygroscopic material, with a simple structure and ingenious design.

[0048] In some embodiments of the present invention, Fig. 9 As shown, the moisture-proof holes include a plurality of moisture-proof holes, which are arranged at intervals on the end surface of the other end of the housing 11. Thus, the moisture absorption area is increased, the moisture absorption efficiency is improved, and the moisture absorption effect is guaranteed.

[0049] In some embodiments of the present invention, the cover 12 is threadedly connected to the housing 11. This prevents the cover from falling during driving and reduces the failure rate.

[0050] In some embodiments of the utility model, the explosion-proof valve 1 further includes: a sealing member, which is arranged between the cover 12 and the shell 11, and is used to seal the moisture-absorbing member to prevent external air from entering the bag. Specifically, the sealing member can be a water-impermeable and air-impermeable film, such as an aluminum-plastic film, a PET film, etc., and is fixed at the sealing portion of the shell 11 or fixed on the sealing protection cover in the factory state. The cover 12 protects the sealing member to prevent the sealing member from being pierced by sharp objects, which may cause the explosion-proof valve 1 to fail in function.

[0051] In some embodiments of the present invention, the hygroscopic member is silica gel particles, vermiculite, calcium carbonate particles or molded fibers. It should be noted that the hygroscopic member can be in a solid or liquid packaging form, preferably a solid, and is packaged with a breathable membrane material such as a non-woven fabric to prevent the hygroscopic member from falling into the battery pack 100 through the moisture-proof hole and contaminating the environment in the battery pack 100, and the hygroscopic member is replaceable.

[0052] Furthermore, in addition to removing the humid air in the package under normal conditions, in order to realize the function of internal humidity monitoring, the hygroscopic material in the explosion-proof valve 1 is replaced manually or the entire explosion-proof valve 1 is replaced, and a chemical substance that absorbs water and changes color is coated on the surface of the seal. The humidity in the package is monitored by the depth of color to see whether it exceeds the threshold, and the battery pack 100 is checked for sealing failure. It is sent for inspection in time to avoid electrical insulation failure caused by sealing failure.

[0053] Furthermore, the humidity sensor can be combined with the BMS control strategy. Once the humidity reaches the dew point, the heating device can be turned on to heat the air in the package, discharge excess humid air, and reduce the humidity of the air in the package. However, this method also has certain defects. If the car is in a high humidity environment for a long time, the heating or other dehumidification strategies need to be turned on for a long time.

[0054] The explosion pressure of the explosion-proof valve 1 can be adjusted to be variable, and an explosion-proof valve 1 with different explosion pressures can be selected according to different regions and environments. Since the situation of driving from low altitude to high altitude is rare in the entire car driving state, an explosion-proof valve 1 that meets the explosion pressure of the thermal runaway state is preferred. Since the structure has a sealing film, it blocks the flow of gas inside and outside the battery pack 100. When a car equipped with a power battery is driving from a normal driving environment to a high-altitude and low-pressure area, due to the high internal pressure of the battery pack 100 and the low external air pressure, the upper shell 11 of the battery pack 100 will bulge, which may seriously cause the sealing failure of the upper and lower shells 11. Therefore, it is necessary to have a corresponding pressure relief channel to quickly balance the air pressure inside and outside the battery pack 100 and reduce the possibility of deformation of other components.

[0055] When the pressure difference between the inside and outside of the battery pack 100 is greater than about 400Pa, the pressure will quickly rupture and release from the seal. When the explosion-proof valve 1 structure is damaged, a new explosion-proof valve 1 can be replaced under low humidity conditions. The hygroscopic component contained in the explosion-proof valve 1 absorbs the moisture entering from the outside, and then isolates the inside and outside air through sealing. If conditions permit, the car can be placed in a professional repair shop to maintain a low humidity environment to replace the explosion-proof valve 1, restore the sealing of the entire package, and enable the battery pack 100 and the car to be used normally. Of course, the explosion-proof valve 1 structure has a variety of pressure threshold options. For example, if you drive in inland low-altitude areas for a long time, you can choose a seal with an opening pressure of about 4Mpa. It is used to open the valve in extreme thermal runaway conditions, and keep the battery pack 100 in a sealed state under normal conditions.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An explosion-proof valve, characterized in that: include: A housing, wherein a receiving cavity is formed in the housing, the housing comprises a shell and a cover, the shell is formed in a cylindrical shape, the receiving cavity is formed in the shell, the cover is provided at one end of the shell and covers an open side of the receiving cavity, and a moisture-proof hole is formed at the other end of the shell, and the moisture-proof hole penetrates the shell in a thickness direction of the shell; A moisture absorbent member is disposed in the accommodating cavity.

2. The explosion-proof valve according to claim 1, characterized in that: The moisture-proof holes include a plurality of holes, and the plurality of moisture-proof holes are arranged at intervals on the end surface of the other end of the shell.

3. The explosion-proof valve according to claim 2, characterized in that: The cover body is threadedly connected to the shell.

4. The explosion-proof valve according to claim 3, characterized in that: Also includes: A sealing member is disposed between the cover and the shell and is used for sealing the moisture absorbing member.

5. The explosion-proof valve according to any one of claims 1 to 4, characterized in that: The moisture absorbing member is silica gel particles, vermiculite, calcium carbonate particles or shaped fibers.

6. The explosion-proof valve according to claim 4, characterized in that: The sealing member is an aluminum-plastic film or a PET film.

7. A battery pack, characterized in that: The explosion-proof valve comprises the explosion-proof valve according to any one of claims 1 to 6.

8. The battery pack according to claim 7, characterized in that: Also includes: The explosion-proof valve is arranged on the side beam and connected with the side beam.

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