Explosion-proof valve, battery and electric equipment

Abstract

The utility model provides an anti-explosion valve, a battery and electric equipment. The anti-explosion valve comprises a first valve body and a second valve body, the first valve body is connected to the side, deviating from the inner cavity of the shell, of the through hole, and the second valve body is connected to the side, facing the inner cavity of the shell, of the through hole. The second valve body is an anti-corrosion valve body, and the blasting value of the second valve body is smaller than that of the first valve body, so that the second valve body can effectively separate the first valve body from the electrolyte, the first valve body cannot make contact with the electrolyte in the normal use process, and in other words, the second valve body can guarantee that the first valve body is not corroded by the electrolyte in the normal state; the second valve body plays a role in isolating and protecting the first valve body, the second valve body is an anti-corrosion valve body, and the anti-corrosion effect is good, so that the anti-explosion valve can be normally opened to release pressure when a battery fails to generate gas, and safety accidents such as explosion caused by the fact that the anti-explosion valve cannot be normally opened to release pressure are avoided. The safety and the reliability of the anti-explosion valve are improved, and the service life of the anti-explosion valve is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technical field, concretely relates to a kind of explosion-proof valve, battery and electric equipment. BACKGROUND

[0002] With the wide application of battery in automobile, energy storage field, the safety performance of battery is an important index to evaluate battery.Explosion-proof valve as safety component, it is usually set on the top cover of battery, main function is when battery failure gas production, can open pressure relief in time, ensure that battery internal pressure is not too big and lead to explosion.

[0003] However, in the related art, battery in long-term use, explosion-proof valve is corroded by electrolyte in battery, lead to explosion-proof valve when battery failure gas production cannot normally open pressure relief, cause explosion and other safety accidents, seriously even can cause casualties and property loss. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model embodiment is dedicated to providing a kind of explosion-proof valve, battery and electric equipment, to solve the problem that explosion-proof valve in prior art cannot normally open pressure relief when battery fails due to being corroded by electrolyte in battery.

[0005] First, the utility model provides a kind of explosion-proof valve, for being set in the through hole of battery shell, the explosion-proof valve includes first valve body and second valve body;

[0006] The first valve body is connected at the side of the through hole away from the inner cavity of the shell, and the second valve body is connected at the side of the through hole towards the inner cavity of the shell;The second valve body is a corrosion-resistant valve body, and the burst value of the second valve body is less than the burst value of the first valve body.

[0007] Optionally, the second valve body is a plastic valve body.

[0008] Optionally, the second valve body is a nano injection molding valve body.

[0009] The inner wall of the shell is provided with a plurality of nano holes, and the plurality of nano holes are arranged along the circumference of the through hole;The part of the nano injection molding valve body corresponding to each nano hole is embedded into the corresponding nano hole.

[0010] Optionally, the burst value of the second valve body is 1 / 4-1 / 2 of the burst value of the first valve body.

[0011] Optionally, the first valve body has a first burst portion in the middle, and the thickness of the first burst portion is less than the thickness of the first valve body;The second valve body has a second burst portion opposite to the first burst portion in the middle, and the thickness of the second burst portion is less than the thickness of the second valve body.

[0012] The area S1 of the first bursting portion, the area S2 of the second bursting portion, and the area S3 of the through hole at the minimum diameter satisfy the following relationship: S2≤S1<S3.

[0013] Optionally, the first valve body is a metal valve body.

[0014] Optionally, a side of the through hole facing the first valve body has an accommodating groove, and at least a portion of the first valve body is disposed in the accommodating groove.

[0015] Optionally, along the circumference of the through hole, there is a gap between the circumferential outer wall of the first valve body and the groove wall of the accommodating groove.

[0016] In a second aspect, the present invention provides a battery comprising a housing and the explosion-proof valve as described above;

[0017] The bottom of the shell is provided with the through hole, and the explosion-proof valve is arranged in the through hole.

[0018] In a third aspect, the present invention provides an electrical device comprising the battery as described above.

[0019] The explosion-proof valve, battery and electrical equipment provided by the utility model are realized by setting the explosion-proof valve to two parts, a first valve body and a second valve body, and connecting the first valve body to the outside of the through hole and the second valve body to the inside of the through hole. In addition, the second valve body is an anti-corrosion valve body. In this way, the first valve body can be effectively isolated from the electrolyte through the second valve body, that is, during normal use, the first valve body will not come into contact with the electrolyte. In other words, the second valve body can ensure that the first valve body is not corroded by the electrolyte under normal conditions, and the second valve body plays an isolating and protective role for the first valve body. In addition, the second valve body is an anti-corrosion valve body with good anti-corrosion effect, so that the explosion-proof valve can be opened normally to release pressure when the battery fails and produces gas, thereby avoiding the occurrence of safety accidents such as explosion caused by the failure of the explosion-proof valve to open normally to release pressure, thereby improving the safety and reliability of the explosion-proof valve and extending its service life.

[0020] At the same time, since the bursting value of the second valve body located inside is smaller than the bursting value of the first valve body located inside, when the battery fails and produces a large amount of gas and the internal pressure reaches a preset level, it can be ensured that the second valve body opens before the first valve body opens. That is, the second valve body inside will burst before the first valve body bursts. On the basis of ensuring that the first valve body will not be corroded by the electrolyte, it can further ensure that the explosion-proof valve can open normally to release pressure, thereby improving safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of assembling the explosion-proof valve according to one embodiment of the present utility model on the battery housing;

[0022] Figure 2 The exploded schematic view of the explosion-proof valve on the shell of the battery according to an embodiment of the present application is shown in the figure;

[0023] Figure 3 The cross-sectional view of the battery at the explosion-proof valve according to an embodiment of the present application is shown in the figure;

[0024] Figure 4 The exploded schematic view of the battery at the explosion-proof valve according to an embodiment of the present application is shown in the figure; Figure 3 The enlarged view of part A in the figure;

[0025] Figure 5 The exploded schematic view of the battery at the explosion-proof valve according to an embodiment of the present application is shown in the figure;

[0026] Figure 6 The enlarged view of part B in the figure. Figure 5

[0027] Wherein, 10, explosion-proof valve; 1, first valve body; 11, first explosion part; 2, second valve body; 21, first positioning part; 22, second explosion part; 3, bevel; 20, shell; 201, through hole; 211, second positioning part; 221, accommodating groove. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art based on the embodiments of the present application belong to the scope of protection of the present application.

[0029] Referring to FIG. Figures 1 to 6 The present embodiment provides an explosion-proof valve, which is arranged in a through hole 201 of a battery shell 20, and the explosion-proof valve comprises a first valve body 1 and a second valve body 2.

[0030] Specifically, the first valve body 1 is connected to a side of the through hole 201 away from the inner cavity of the shell 20, i.e. the first valve body 1 is connected to the outer side of the through hole 201. The second valve body 2 is connected to a side of the through hole 201 facing the inner cavity of the shell 20, i.e. the second valve body 2 is connected to the inner side of the through hole 201. The second valve body 2 is a corrosion-proof valve body, and the explosion value of the second valve body 2 is smaller than the explosion value of the first valve body 1.

[0031] ​By connecting the first valve body 1 outside the through hole 201 and connecting the second valve body 2 inside the through hole 201, the second valve body 2 can isolate the first valve body 1, and the second valve body 2 has an isolation protection effect on the first valve body 1, so that the first valve body 1 is prevented from being corroded by the electrolyte in the battery in a normal use state, and to a certain extent, the safety valve can be normally opened to release pressure when the battery fails to produce gas, and the occurrence of safety accidents such as explosion caused by the safety valve unable to normally open to release pressure is avoided, the safety and reliability of the safety valve are improved, and the service life of the safety valve is prolonged.

[0032] At the same time, the second valve body 2 is provided as a corrosion-resistant valve body, and the second valve body 2 has good corrosion resistance, so that the isolation protection effect of the second valve body 2 on the first valve body 1 is better, and the safety and reliability of the safety valve are further improved when the battery fails to produce gas.

[0033] In specific implementation, the burst value of the second valve body 2 is less than the burst value of the first valve body 1, that is, the burst value of the second valve body 2 located on the inside is less than the burst value of the first valve body 1 located on the outside, so that the second valve body 2 can be opened before the first valve body 1 when the battery fails to produce gas, and the safety valve can be normally opened to release pressure when the battery fails to produce gas.

[0034] In summary, when the battery is in a normal state, the internal pressure is stable, and the second valve body 2 effectively prevents the first valve body 1 from being corroded by the electrolyte in the battery in a normal state. When the battery fails, thermal runaway occurs in the battery, and the internal pressure of the battery continues to rise. When the internal pressure of the battery reaches the burst value of the second valve body 2, the first valve body 1 will definitely burst, effectively ensuring that the safety valve can be normally opened to release pressure when the battery fails.

[0035] It should be noted that after the second valve body 2 bursts when the battery fails, even if the first valve body 1 is corroded by the electrolyte, the safety performance of the battery will not be affected.

[0036] In specific implementation, the through hole 201 can be provided on the wall surface of any side of the shell 20 or on the top cover. The following embodiment takes the through hole 201 provided on the bottom wall of the shell 20 as an example for description.

[0037] By providing the through hole 201 on the bottom wall of the shell 20, the safety valve can be arranged at the bottom of the shell, so that when the safety valve is opened to release pressure, the substances in the cell core will not be sprayed onto other cell cores, the safety performance is improved, and the safety valve is also suitable for being arranged on a battery with a smaller size.

[0038] The explosion-proof valve provided by the embodiment is provided as two parts of a first valve body 1 and a second valve body 2, the first valve body 1 is connected to the outside of the through hole 201, the second valve body 2 is connected to the inside of the through hole 201, and the second valve body 2 is a corrosion-proof valve body. In this way, the first valve body 1 can be effectively isolated from the electrolyte by the second valve body 2, that is, the first valve body 1 does not come into contact with the electrolyte in the normal use process. In other words, the second valve body 2 can ensure that the first valve body 1 is not corroded by the electrolyte in the normal state, and the second valve body 2 plays a role of isolation and protection for the first valve body 1. Moreover, the second valve body 2 is a corrosion-proof valve body, and the corrosion-proof effect is good. Therefore, the explosion-proof valve can normally open and release pressure when the battery fails to produce gas, thereby avoiding the occurrence of safety accidents such as explosion caused by the failure of the explosion-proof valve to normally open and release pressure, improving the safety and reliability of the explosion-proof valve, and prolonging the service life of the explosion-proof valve.

[0039] At the same time, since the burst value of the second valve body 2 located on the inside is smaller than the burst value of the first valve body 1 located on the inside, when the battery fails to produce a large amount of gas and the internal pressure reaches a preset pressure, the second valve body 2 can be ensured to open before the first valve body 1 opens, that is, the second valve body 2 located on the inside will burst before the first valve body 1 bursts. Therefore, on the basis of ensuring that the first valve body 1 will not be corroded by the electrolyte, it can be further ensured that the explosion-proof valve can normally open and release pressure, and the safety performance is improved.

[0040] In some embodiments, the second valve body 2 is a plastic valve body, which has good corrosion resistance and corrosion prevention performance, and is easy to burst and open to release pressure when the battery fails to produce gas, and is safe and reliable.

[0041] In specific implementation, the plastic valve body can be connected to the inner wall surface of the shell 20 by bonding or hot melting connection. It should be noted that the plastic valve body is not used alone as the explosion-proof valve because, although the plastic valve body has good corrosion resistance, its burst value is not stable enough, so the first valve body needs to be provided at the same time.

[0042] In some embodiments, the second valve body 2 is a nano injection molding valve body. The inner wall of the shell 20 is provided with a plurality of nano holes, and the plurality of nano holes are arranged at intervals along the circumference of the through hole 201, that is, a plurality of nano holes are arranged at intervals on the circumference of the edge of the side of the through hole 201 facing the inner cavity of the shell 20. The part of the nano injection molding valve body corresponding to each nano hole is embedded into the corresponding nano hole, which increases the contact area of the nano injection molding valve body and the shell 20, thereby improving the connection strength and structural strength of the nano injection molding valve body on the shell 20.

[0043] In a specific implementation, the second valve body 2 is a nano-injection valve body formed by injecting nano into the area surrounded by all the nano holes. The structure is simple and easy to manufacture. The second valve body 2 formed by injecting nano into the area surrounded by all the nano holes is integrally formed with the shell 20, and has good sealing performance, further avoiding the contact between the first valve body 1 and the electrolyte inside the shell 20.

[0044] In some embodiments, the burst value of the second valve body 2 is 1 / 4-1 / 2 of the burst value of the first valve body 1, that is, the burst value of the second valve body 2 located on the inner side is smaller than the burst value of the first valve body 1 located on the outer side, and the burst value of the second valve body 2 is not greater than half of the burst value of the first valve body 1. In this way, when the battery fails, the second valve body 2 can be further ensured to open before the first valve body 1 opens, thereby further ensuring that the explosion-proof valve can normally open and release pressure when the battery fails.

[0045] Reference Figure 4 and Figure 6 As shown in FIGS. 1, 2, 3, and 4, in some embodiments, the first valve body 1 has a first burst portion 11 in the middle, and the thickness of the first burst portion 11 is smaller than the thickness of the first valve body 1. The second valve body 2 has a second burst portion 22 opposite to the first burst portion 11 in the middle, and the thickness of the second burst portion 22 is smaller than the thickness of the second valve body 2. The area S1 of the first burst portion 11, the area S2 of the second burst portion 22, and the area S3 of the smallest diameter of the through hole 201 satisfy the following relationship: S2≤S1<S3.

[0046] That is, the thinned area in the middle of the first valve body 1 is formed as the first burst portion 11, and the area S1 of the first burst portion 11 is smaller than the area S3 of the through hole 201. The thinned area in the middle of the second valve body 2 is formed as the second burst portion 22, and the area S2 of the second burst portion 22 is smaller than the area S3 of the through hole 201, and the area S2 of the second burst portion 22 located on the inner side is smaller than the area S1 of the first burst portion 11 located on the outer side. In this way, it is ensured that the second burst portion 22 located on the inner side will burst before the first burst portion 11 located on the outer side bursts. This not only avoids the phenomenon that the second valve body 2 blocks the through hole 201 after opening, affecting the ejection of the internal substances of the battery cell, but also further ensures that the second valve body 2 opens before the first valve body 1 opens. In addition, on the basis of ensuring that the first valve body 1 will not be corroded by the electrolyte, the explosion-proof valve can be further ensured to normally open and release pressure, so that the safety performance is higher.

[0047] In some implementations, the area S1 of the first burst portion 11 and the area S2 of the second burst portion 22 further satisfy the following relationship: 1 / 4S1≤S2.

[0048] In some embodiments, the first explosion part 11, the second explosion part 22 and the through hole 201 are coaxially arranged, so that the first explosion part 11 and the second explosion part 22 can be easily exploded to open the valve when the battery fails, and the explosion reliability and safety of the explosion-proof valve are further improved.

[0049] In some embodiments, the first valve body 1 is a metal valve body, such as an aluminum valve body.

[0050] In specific implementation, the first valve body 1 can be welded on the edge of the side of the through hole 201 away from the inner cavity of the shell 20.

[0051] Referring to Figure 4 In some embodiments, the side of the through hole 201 facing the first valve body 1 has a receiving groove 221, and at least part of the first valve body 1 is arranged in the receiving groove 221.

[0052] That is, the outer wall surface of the side of the through hole 201 away from the inner cavity of the shell 20 is provided with an annular stepped groove, the stepped groove is recessed from the outer wall surface of the shell to the side of the inner cavity of the shell 20, and forms a sunken groove. In the axial direction of the through hole 201, at least part of the first valve body 1 is located in the receiving groove 221. In this way, the receiving groove 221 has a protection and accommodation effect on the first valve body 1, which can not only avoid interference of the first valve body 1 with environmental elements on the outside of the shell, but also facilitate assembly, and at the same time, can prolong the service life of the first valve body 1 to a certain extent.

[0053] In specific implementation, the first valve body 1 can be welded in the receiving groove 221.

[0054] Referring to Figure 4 and Figure 6 In some embodiments, there is a gap between the circumferential outer wall of the first valve body 1 and the groove wall of the receiving groove 221 in the circumferential direction of the through hole 201. In this way, not only the assembly of the first valve body 1 is facilitated, but also the phenomenon of the first valve body 1 being stuck when the battery fails is avoided to a certain extent, which facilitates the explosion of the first valve body 1 to open the valve, and further improves the explosion safety and reliability of the explosion-proof valve.

[0055] Referring to Figure 4 and Figure 6 In some embodiments, the side of the second valve body 2 facing the first valve body 1 is provided with a first positioning part 21, and the wall surface of the side of the through hole 201 facing the inner cavity of the shell 20 is provided with a second positioning part 211, the second positioning part 211 cooperates with the first positioning part 21 to position the second valve body 2, which facilitates the assembly of the second valve body 2 and helps to improve the assembly efficiency.

[0056] In some embodiments, referring to Figure 4 and Figure 6As shown, the first positioning part 21 is a positioning groove, and the second positioning part 211 is a positioning protrusion which can extend into the positioning groove, so that the structure is simple, the manufacturing is convenient, and the positioning effect is good.

[0057] In other embodiments, the first positioning part can be a positioning protrusion, and the second positioning part is a positioning groove for the positioning protrusion to extend into.

[0058] Referring to Figure 2 , Figure 4 and Figure 6 , in some embodiments, the positioning groove is an annular groove arranged along the circumference of the second valve body 2, and the positioning protrusion is an annular protrusion arranged along the circumference of the through hole 201, so that the structure is simple, the manufacturing is convenient, and the positioning is convenient and reliable.

[0059] Through the cooperation of the annular groove and the annular protrusion, the positioning of the second valve body 2 is more convenient and reliable during assembly.

[0060] In other embodiments, a plurality of positioning grooves can be arranged on the second valve body 2, and the plurality of positioning grooves are arranged at intervals along the circumference of the second valve body 2. Correspondingly, a plurality of positioning protrusions are arranged on the wall surface of the second valve body 2 towards the inner cavity of the shell 20, and the plurality of positioning protrusions are arranged at intervals along the circumference of the through hole 201 on the inner wall surface of the shell 20, and one positioning groove is connected with one positioning protrusion.

[0061] Referring to Figure 4 and Figure 6 , in some embodiments, the second valve body 2 is provided with a bevel 3 at the circumferential edge thereof, and the bevel 3 is arranged to be inclined away from the second valve body 2 in the direction from the second valve body 2 to the first valve body 1.

[0062] That is, the second valve body 2 is provided with a bevel 3 at the circumferential edge thereof, and the thickness of the bevel 3 gradually decreases in the direction from the middle of the second valve body 2 to the edge of the second valve body 2, so that the circumferential edge of the second valve body 2 is formed into a thinned edge, which can to some extent avoid the interference of the second valve body 2 with the module located inside the shell 20, and the safety in use is higher.

[0063] The utility model provides a kind of battery, and the battery includes shell 20 and explosion-proof valve.

[0064] When being specifically implemented, the side wall of the shell 20 is provided with a through hole 201 for mounting the explosion-proof valve.

[0065] In some implementation ways, the through hole 201 can be arranged on the bottom of the shell 20, and the explosion-proof valve is mounted in the through hole 201.

[0066] In other implementation ways, the through hole 201 can also be arranged on other wall surfaces of the shell 20.

[0067] The power battery generally comprises a top cover arranged at the opening end of the shell 20, and in some implementations, a through hole 201 can be arranged on the top cover.

[0068] The explosion-proof valve in the embodiment and the explosion-proof valve provided in the above embodiment have the same structure and implementation principle and can bring the same or similar technical effects, and details are not described herein again. Please refer to the description of the above embodiment.

[0069] The embodiment further provides a power-using device comprising the battery.

[0070] The battery in the embodiment and the battery provided in the above embodiment have the same structure and implementation principle and can bring the same or similar technical effects, and details are not described herein again. Please refer to the description of the above embodiment.

[0071] In this document, it should be noted that unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connecting” should be understood in a broad sense, for example, it can be fixedly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances. In addition, the terms “up”, “down”, “left”, “right”, “front”, “back”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside” and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of this application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on this application.

[0072] In this document, relational terms such as “first” and “second”, and the like can only be used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms “include”, “contain” or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the element defined by the statement “including a…” does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0073] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An explosion-proof valve for being disposed in a through-hole (201) of a battery case (20), characterized by, The explosion-proof valve comprises a first valve body (1) and a second valve body (2); The first valve body (1) is connected to a side of the through hole (201) away from the inner cavity of the shell (20), and the second valve body (2) is connected to a side of the through hole (201) facing the inner cavity of the shell (20); the second valve body (2) is a corrosion-proof valve body, and the burst value of the second valve body (2) is less than the burst value of the first valve body (1).

2. The explosion relief valve of claim 1, wherein The second valve body (2) is a plastic valve body.

3. The explosion relief valve of claim 2, wherein, The second valve body (2) is a nano-injection molded valve body. The inner wall of the shell (20) is provided with a plurality of nano-holes, and the plurality of nano-holes are arranged at intervals along the circumference of the through hole (201); the part of the nano-injection molded valve body corresponding to each nano-hole is embedded in the corresponding nano-hole.

4. The explosion relief valve of claim 1, wherein, The burst value of the second valve body (2) is 1 / 4-1 / 2 of the burst value of the first valve body (1).

5. The explosion relief valve of claim 1, wherein, The middle part of the first valve body (1) has a first burst part (11), and the thickness of the first burst part (11) is less than the thickness of the first valve body (1); the middle part of the second valve body (2) has a second burst part (22) opposite to the first burst part (11), and the thickness of the second burst part (22) is less than the thickness of the second valve body (2); The area S1 of the first burst part (11), the area S2 of the second burst part (22), and the area S3 of the smallest diameter of the through hole (201) satisfy the following relationship: S2≤S1<S3.

6. Explosion relief valve according to any of claims 1 to 5, characterized in that The first valve body (1) is a metal valve body.

7. Explosion relief valve according to any of claims 1 to 5, characterized in that The side of the through hole (201) facing the first valve body (1) has a containing groove (221), and at least part of the first valve body (1) is arranged in the containing groove (221).

8. The explosion relief valve of claim 7, wherein, Along the circumference of the through hole (201), there is a gap between the circumferential outer wall of the first valve body (1) and the groove wall of the containing groove (221).

9. A battery, characterized by The explosion-proof valve comprises a shell (20) and the explosion-proof valve according to any one of claims 1 to 8; The bottom of the shell (20) is provided with the through hole (201), and the explosion-proof valve is arranged in the through hole (201).

10. An electric device, characterized by The battery comprises the battery according to claim 9. The battery comprises the battery according to claim 9.

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