Explosion-proof valve and battery

Abstract

The utility model provides an explosion-proof valve and a battery, the explosion-proof valve is used for being installed outside a battery cell, the explosion-proof valve comprises a first conduction part, a fusing part and a second conduction part, the first conduction part is in electric contact with the battery cell, the second conduction part is electrically connected with an external element, and the fusing part communicates or separates the first conduction part and the second conduction part. The pressure relief and cutoff functions can be achieved through the anti-explosion valve at the same time, the use safety of the battery can be improved, the number of parts is reduced, and the structure is simple.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an explosion-proof valve and a battery. Background Art

[0002] In today's society, batteries have become a common electrical tool in people's daily lives. When a battery is in an overcharged state, if external components continue to input energy into the battery, it may cause thermal runaway of the battery, resulting in risks such as explosion.

[0003] In the prior art, in order to improve the safety of battery use, an explosion-proof valve is usually provided on the battery to achieve pressure relief, and a current cut-off device is provided to achieve current cut-off, which has a complex structure and limited safety. Utility Model Content

[0004] The present application provides an explosion-proof valve and a battery, which can simultaneously realize pressure relief and current interruption functions through the explosion-proof valve, can improve the safety of battery use, reduce the number of components, and have a simple structure.

[0005] In order to solve the above technical problems, the present application provides an explosion-proof valve, which is used to be installed outside the battery cell. The explosion-proof valve includes: a first conductive part, a fuse part, and a second conductive part. The first conductive part is electrically contacted with the battery cell, the second conductive part is electrically connected to an external element, and the fuse part connects or isolates the first conductive part and the second conductive part.

[0006] Among them, the battery cell includes a shell with an opening and an electrode assembly and a conductor arranged in the shell, and the conductor is electrically connected to the electrode assembly; the first conductive part is provided with a welding area and a sub-conductive area surrounded by the welding area, the welding area is electrically connected to the conductor, the sub-conductive area is covered with an opening, and the fuse part connects or disconnects the sub-conductive area and the second conductive part.

[0007] The fuse part is arranged around the outer periphery of the sub-conducting area, and the second conducting part is arranged around the outer periphery of the fuse part.

[0008] The fuse part includes a first fuse part and a second fuse part which are arranged at intervals, and the first fuse part and the second fuse part have different fusing times.

[0009] The fuse portion includes an etching portion for increasing the fusing speed of the fuse portion.

[0010] The welding area is located at the center of the sub-conducting area.

[0011] The first conducting portion is concave toward the battery core relative to the fuse portion.

[0012] In order to solve the above technical problems, the present application provides a battery, which includes a battery cell and the above explosion-proof valve, and the explosion-proof valve is installed outside the battery cell.

[0013] The first conducting part is electrically contacted with the battery cell by welding, pressing or bonding with a conductive adhesive.

[0014] The battery further includes a first bus bar, which is arranged around and electrically connected to the outer periphery of the second conductive portion, and is also electrically connected to an external element.

[0015] The beneficial effects of the present application are as follows: the explosion-proof valve installed outside the battery cell is provided with a fuse part, and the fuse part can connect the first conducting part and the second conducting part, so that the battery cell can be electrically connected to the external element through the first conducting part, the fuse part and the second conducting part of the explosion-proof valve; the fuse part is separately arranged from the first conducting part, so that the electrical connection structure of the explosion-proof valve and the battery cell and the separation of the current cut-off and pressure relief structure of the explosion-proof valve can be realized, so that the stability of the electrical connection structure of the explosion-proof valve and the battery cell can be improved, and the anti-interference ability of the battery during normal charging and discharging can be improved, and it can It can improve the control accuracy of the timing of the fuse part fusing, and can make the fuse part fuse under the influence of increased air pressure or high temperature when the internal air pressure of the battery cell increases abnormally or thermal runaway occurs, thereby isolating the first conductive part and the second conductive part, achieving pressure relief and cutting off the electrical connection between the battery cell and external components, reducing the risk of safety problems such as battery explosion, and improving the safety of use; further, by setting an explosion-proof valve, when the battery is overcharged, not only can pressure relief be achieved, but also current interruption can be achieved, the structure is simple, and the number of parts can be reduced. Therefore, the present application can achieve pressure relief and current interruption functions at the same time through the explosion-proof valve, which can improve the safety of battery use, reduce the number of parts, and have a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the explosion-proof valve and the first manifold of the present application;

[0018] Figure 2 It is a structural schematic diagram of another embodiment of the explosion-proof valve and the first manifold of the present application;

[0019] Figure 3 It is a structural schematic diagram of another embodiment of the explosion-proof valve and the first manifold of the present application;

[0020] Figure 4 It is a structural schematic diagram of another embodiment of the explosion-proof valve and the first manifold of the present application;

[0021] Figure 5It is a structural schematic diagram of another embodiment of the explosion-proof valve and the first manifold of the present application. DETAILED DESCRIPTION

[0022] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0023] The terms "first", "second" and the like in this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. It should be understood that when used in this specification and the appended claims, the term "including" indicates the presence of the described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. It should also be understood that the terms used in this specification of the application are only for the purpose of describing a specific embodiment and are not intended to limit the application. As used in this specification of the application and the appended claims, unless the context clearly indicates otherwise, the singular forms of "one", "an" and "the" are intended to include plural forms. It should also be further understood that the term "and / or" used in this specification of the application and the appended claims refers to any combination of one or more of the items listed in association and all possible combinations, and includes these combinations.

[0024] As used in this specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0025] It should be noted that when a certain element is fixed to another element, it includes directly fixing the element to the other element, or fixing the element to the other element through at least one other element in the middle. When an element is connected to another element, it includes directly connecting the element to the other element, or connecting the element to the other element through at least one other element in the middle.

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] This application first proposes a battery, such as Figures 1 to 5 As shown, Figure 1 It is a structural schematic diagram of an embodiment of the explosion-proof valve and the first manifold of the present application; Figure 2 It is a structural schematic diagram of another embodiment of the explosion-proof valve and the first manifold of the present application; Figure 3 It is a structural schematic diagram of another embodiment of the explosion-proof valve and the first manifold of the present application; Figure 4 It is a structural schematic diagram of another embodiment of the explosion-proof valve and the first manifold of the present application; Figure 5 It is a structural schematic diagram of another embodiment of the explosion-proof valve and the first busbar of the present application. The battery includes a battery cell and an explosion-proof valve 01, the explosion-proof valve 01 is installed outside the battery cell, the explosion-proof valve 01 includes a first conductive part 11, a fuse part 13, and a second conductive part 12, the first conductive part 11 is electrically connected to the battery cell, the second conductive part 12 is electrically connected to an external element, and the fuse part 13 connects or disconnects the first conductive part 11 and the second conductive part 12.

[0028] The battery cell is an energy storage unit for storing and releasing electrical energy. In this embodiment, the type and shape of the battery cell are not limited. When the battery cell is in an overcharged state, abnormal conditions such as thermal runaway or excessive internal air pressure may easily occur. Therefore, it is necessary to depressurize the battery cell in the abnormal state, cut off the electrical connection between the battery cell and external components, and stop the continuous input of external current and energy, so as to improve the safety of battery use and reduce the probability of risks such as explosion.

[0029] It should be noted that the explosion-proof valve 01 only realizes electrical contact with the battery cell through the first conductive part 11, and the other parts of the explosion-proof valve 01 and the battery cell can form a sealed setting through an insulating connection. Therefore, when the first conductive part 11 and the second conductive part 12 are isolated, the electrical connection between the battery cell and the external elements can be isolated.

[0030] Specifically, the explosion-proof valve 01 of this embodiment realizes electrical connection with the battery cell through the first conducting part 11, and connects or disconnects the first conducting part 11 and the second conducting part 12 by designing the fuse part 13, so as to realize the connection or disconnection of the electrical connection between the battery cell and the external element. When the internal air pressure of the battery cell reaches a preset value or the temperature reaches the melting point of the fuse part 13, the fuse part 13 will rupture and fuse, so as to disconnect the first conducting part 11 and the second conducting part 12, and then cut off the electrical connection between the battery cell and the external element, thereby reducing the probability of the occurrence of risks such as explosion.

[0031] The beneficial effect of the above arrangement is that, in this embodiment, the explosion-proof valve 01 is installed outside the battery core, and the fuse part 13 can connect the first conductive part 11 and the second conductive part 12, so the battery core can be electrically connected to the external element through the first conductive part 11, the fuse part 13, and the second conductive part 12 of the explosion-proof valve 01; the fuse part 13 is separately arranged from the first conductive part 11, which can realize the separation of the electrical connection structure of the explosion-proof valve 01 and the battery core and the current cut-off pressure relief structure of the explosion-proof valve 01, so that the stability of the electrical connection structure between the explosion-proof valve 01 and the battery core can be improved, the anti-interference ability of the battery during normal charging and discharging can be improved, and the resistance to the fuse part 1 can be improved. 3. The control accuracy of the fuse timing can make the fuse part 13 fuse under the influence of increased air pressure or high temperature when the internal air pressure of the battery cell increases abnormally or thermal runaway occurs, thereby isolating the first conductive part 11 and the second conductive part 12, achieving pressure relief and cutting off the electrical connection between the battery cell and external components, reducing the risk of safety problems such as battery explosion, and improving the safety of use; further, by setting the explosion-proof valve 01, when the battery is overcharged, not only pressure relief can be achieved, but also current interruption can be achieved, and the structure is simple, that is, the explosion-proof valve 01 can also act as a current interruption device while relieving pressure, so the number of battery components can be reduced. Therefore, this embodiment can further improve the safety of battery use, reduce the number of components, and has a simple structure.

[0032] Optionally, the first conducting portion 11 is welded to the battery cell to be in electrical contact with the battery cell.

[0033] The first conducting portion 11 is welded to the battery cell, which can improve the stability of the electrical contact arrangement between the first conducting portion 11 and the battery cell, and improve the safety and stability of the battery during normal use.

[0034] In other embodiments, the first conducting portion 11 may also be electrically contacted with the battery cell by pressing or bonding with a conductive adhesive, which can reduce assembly difficulty and improve production convenience.

[0035] Optionally, the first conducting portion 11 is recessed inwardly of the battery cell relative to the fuse portion 13 .

[0036] The first conducting portion 11 is concave toward the battery cell relative to the fuse portion 13, so as to facilitate the electrical contact setting between the first conducting portion 11 and the battery cell. In one application scenario, the connection strength between the electrical contact setting between the first conducting portion 11 and the battery cell can be controlled so that when the internal air pressure of the battery cell is too high, the first conducting portion 11 can be changed from being concave to being gradually bulging, that is, the electrical contact area between the first conducting portion 11 and the battery cell is gradually reduced, so as to achieve current interruption and cut off the electrical connection between the battery cell and external components. Furthermore, the first conducting portion 11 is concave toward the battery cell relative to the fuse portion 13, and when the internal pressure of the battery cell increases, the explosion-proof valve 01 can be deformed, thereby reducing the contact area between the first conducting portion 11 and the battery cell, and increasing the resistance between the first conducting portion 11 and the battery cell. The temperature rise caused by the increase in resistance can cause the fuse portion 13 to melt, thereby achieving pressure relief and current interruption of the battery cell.

[0037] Optionally, the battery cell includes a shell with an opening and an electrode assembly disposed in the shell, such as Figure 4 As shown, the fuse part 13 is covered at the opening of the shell, and the first conductive part 11 is electrically connected to the electrode assembly.

[0038] In one application scenario, the electrode assembly participates in the electrochemical reaction to generate current, thereby realizing the conversion and storage of electrical energy; the first conductive portion 11 is electrically connected to the electrode assembly to realize the electrical connection between the battery cell and the external element; the explosion-proof valve 01 is sealed and connected to the battery cell, and the fuse portion 13 of the explosion-proof valve 01 is covered at the opening of the shell. When the internal air pressure or temperature of the battery cell increases, the fuse portion 13 melts to connect the opening with the external environment, so that the airflow in the shell is discharged to the external environment, which is convenient for better pressure relief inside the battery cell, and the cover is arranged at the opening to reduce the size of the explosion-proof valve 01, improve assembly convenience, and reduce material consumption.

[0039] Optionally, the battery cell includes a shell with an opening, an electrode assembly and a conductor arranged in the shell, and the conductor is electrically connected to the electrode assembly; the fuse part 13 is covered at the opening, and the first conductive part 11 is electrically connected to the conductor.

[0040] In one application scenario, the electrode assembly participates in the electrochemical reaction to generate current, thereby realizing the conversion and storage of electric energy; the setting of the conductor facilitates the electrical contact setting between the electrode assembly and the first conductive part 11 of the explosion-proof valve 01. In one application scenario, the conductor includes a pole ear, which is electrically connected to the electrode assembly and the first conductive part 11 to realize the electrical connection between the battery cell and the explosion-proof valve 01, and then realizes the electrical connection between the battery cell and the external components to ensure the normal use of the battery; in other application scenarios, the conductor also includes a second busbar, which is electrically connected to the pole ear and the first conductive part 11 to realize the electrical connection between the battery cell and the explosion-proof valve 01. The shape and composition of the conductor can be set as needed to realize the electrical connection between the battery cell and the explosion-proof valve 01, and there is no specific limitation.

[0041] In other embodiments, the fuse part 13 may not completely cover the opening. When the fuse part 13 is blown, the opening is connected to the external environment, so that the air flow in the shell flows to the external environment, thereby achieving internal pressure relief of the battery cell.

[0042] Optionally, the battery cell includes a shell with an opening, an electrode assembly and a conductor arranged in the shell, and the conductor is electrically connected to the electrode assembly; the first conductive portion 11 is covered at the opening and electrically connected to the conductor.

[0043] like Figures 1 to 3 As shown, the first conducting part 11 is covered at the opening, and when the fuse part 13 is blown, the first conducting part 11 and the second conducting part 12 are separated. Since the first conducting part 11 is covered at the opening, after the fuse part 13 is blown, the first conducting part 11 is separated from the second conducting part 12, so that the airflow in the shell passes through the opening to the first conducting part 11, so that the first conducting part 11 is separated from the opening, and the airflow in the shell leaks to the external environment, that is, the sealing structure between the explosion-proof valve 01 and the battery cell is destroyed, and the opening is connected with the external space to achieve pressure relief.

[0044] The arrangement of the conductor here facilitates the electrical contact arrangement between the electrode assembly and the first conductive part 11 of the explosion-proof valve 01. In one application scenario, the conductor includes a pole ear, which is electrically connected to the electrode assembly and to the first conductive part 11, so as to realize the electrical connection between the battery cell and the explosion-proof valve 01, and then realize the electrical connection between the battery cell and the external components, so as to ensure the normal use of the battery; in other application scenarios, the conductor also includes a second busbar, which is electrically connected to the pole ear and the first conductive part 11, so as to realize the electrical connection between the battery cell and the explosion-proof valve 01. The shape and composition of the conductor can be set as needed to realize the electrical connection between the battery cell and the explosion-proof valve 01, and there is no specific limitation.

[0045] Alternatively, if Figure 1 As shown, the first conductive portion 11 is provided with a welding area 111 and a sub-conductive area 112 surrounding the welding area 111 , the welding area 111 is electrically connected to the conductor, the sub-conductive area 112 is covered with an opening, and the fuse portion 13 connects or isolates the sub-conductive area 112 from the second conductive portion 12 .

[0046] like Figure 1As shown, the sub-conducting area 112 is arranged around the outer periphery of the welding area 111, so as to facilitate the flow of current between the conductor, the welding area 111 and the sub-conducting area 112, thereby improving the uniformity of current distribution; after the fuse 13 is blown, the sub-conducting area 112 is separated from the second conducting part 12, so that the airflow in the shell is rushed to the sub-conducting area 112 through the opening, so that the sub-conducting area 112 is separated from the opening, and the airflow in the shell is leaked to the external environment, that is, the sealing structure between the explosion-proof valve 01 and the battery cell is destroyed, and the opening is connected with the external space to achieve pressure relief.

[0047] In other embodiments, Figure 3 As shown, the sub-conducting area 112 and the welding area 111 may not be in an enclosed relationship. For example, one end of the sub-conducting area 112 is electrically connected to the welding area 111, and the other end is electrically connected to the fuse part 13. The fuse part 13 realizes the electrical connection between the sub-conducting area 112 and the second conductive part 12. The melting of the fuse part 13 can isolate the sub-conducting area 112 from the second conductive part 12, which can not only cut off the current between the second conductive part 12 and the sub-conducting area 112 and the welding area 111 (that is, cut off the electrical connection between the battery cell and the external components), but also the melting of the fuse part 13 allows the airflow in the shell to rush to the sub-conducting area 112 through the opening, so that the sub-conducting area 112 is separated from the opening, and the airflow in the shell is discharged to the external environment to achieve pressure relief.

[0048] Alternatively, if Figure 1 , Figure 2 , Figure 4 As shown, the welding region 111 is located at the center of the sub-conducting region 112 .

[0049] The welding area 111 is located at the center of the sub-conducting area 112, which can improve the uniformity of force and improve the structural stability of the welding area 111; and the welding area 111 is electrically connected to the conductor to achieve the electrical contact setting between the first conductive part 11 and the battery cell. Therefore, the welding area 111 is located at the center of the sub-conducting area 112, which is convenient for improving the uniformity of current distribution of the first conductive part 11.

[0050] In one application scenario, when the fuse part 13 is arranged around the periphery of the sub-conducting area 112, the welding area 111 is located at the center of the sub-conducting area 112, so as to reduce the interference effect of the high temperature during welding on the fuse part 13, reduce the damage rate of accessories, and improve the convenience of production equipment.

[0051] Alternatively, if Figure 1 , Figure 2 , Figure 4 As shown, the fuse portion 13 is disposed around the outer periphery of the sub-conducting region 112 , and the second conductive portion 12 is disposed around the outer periphery of the fuse portion 13 .

[0052] The fuse part 13 is arranged around the periphery of the sub-conducting area 112, which means that the fuse part 13 is completely arranged around the sub-conducting area 112, and the second conductive part 12 is arranged around the periphery of the fuse part 13, so that the sub-conducting area 112 and the second conductive part 12 can be connected or disconnected through the fuse part 13, that is, the first conductive part 11 and the second conductive part 12 can be connected or disconnected through the fuse part 13.

[0053] Furthermore, the fuse part 13 is arranged around the outer periphery of the sub-conducting area 112. When the air pressure or temperature inside the battery cell increases, the fuse part 13 can be gradually melted, and then gradually release the pressure, and can gradually increase the resistance between the first conductive part 11 and the second conductive part 12, and then gradually reduce the current between the first conductive part 11 and the second conductive part 12 to zero to achieve current interruption. This gradual melting can play a certain early warning role, that is, the gradual pressure relief is a pressure relief method that does not need to wait until the air pressure inside the battery cell reaches a very high level before breaking the explosion-proof valve 01, so it can improve the performance of the explosion-proof valve 01, that is, when a certain abnormal air pressure appears inside the battery cell, the pressure can be gradually released, reducing the destructiveness of the high air pressure inside the battery cell and improving the safety of battery use.

[0054] In one application scenario, the first conducting portion 11 is provided with a welding area 111 and a sub-conducting area 112 surrounding the welding area 111, the welding area 111 is electrically connected to the conductor, the sub-conducting area 112 is covered with an opening, the fuse portion 13 is surrounded by the sub-conducting area 112, and the second conducting portion 12 is surrounded by the fuse portion 13. This surrounding setting can not only improve the uniformity of current distribution on the first conducting portion 11 and the second conducting portion 12, but also facilitate the fuse portion 13 to achieve isolation between the first conducting portion 11 and the second conducting portion 12 by fusing, and the structure is simple.

[0055] Alternatively, if Figure 5 As shown, the fuse part 13 includes a first fuse part 131 and a second fuse part 132 which are arranged at intervals, and the first fuse part 131 and the second fuse part 132 have different fusing timings.

[0056] Specifically, when the first fuse 131 and the second fuse 132 are all blown, the first conductive part 11 and the second conductive part 12 are cut off, that is, the current is cut off. The first fuse 131 and the second fuse 132 have different blowing timings, and can be blown off gradually, so that the pressure can be gradually released, and the resistance between the first conductive part 11 and the second conductive part 12 can be gradually increased, and then the current between the first conductive part 11 and the second conductive part 12 can be gradually reduced to zero to cut off the current. Since there is no need to wait until the internal air pressure of the battery cell reaches a very high level before breaking the explosion-proof valve 01, the performance of the explosion-proof valve 01 can be improved, that is, when a certain abnormal air pressure appears inside the battery cell, the pressure can be gradually released, reducing the destructiveness of the high air pressure inside the battery cell and improving the safety of the battery.

[0057] For example, in one application scenario, the fusing speed of the first fuse 131 is different from the fusing speed of the second fuse 132, so that gradual fusing can be achieved. In one application scenario, the material thickness of the first fuse 131 and the second fuse 132 can be set to be different, so that the fusing speeds of the two are different, so that gradual fusing can be achieved.

[0058] Different fusing speeds can achieve gradual fusing, so that gradual pressure relief can be achieved, and the resistance between the first conductive part 11 and the second conductive part 12 can be gradually increased, thereby gradually reducing the current between the first conductive part 11 and the second conductive part 12 to zero to achieve current interruption. Since it is a pressure relief method that does not require waiting until the internal air pressure of the battery cell reaches a very high level before breaking the explosion-proof valve 01, the performance of the explosion-proof valve 01 can be improved, that is, when a certain abnormal air pressure appears inside the battery cell, the pressure can be gradually relieved, reducing the destructiveness of the high air pressure inside the battery cell, and improving the safety of battery use.

[0059] In other embodiments, the first fuse part 131 and the second fuse part 132 may have different melting points to realize the setting of a gradual fuse mechanism, or the first fuse part 131 and the second fuse part 132 may have different material thicknesses and melting points to realize the setting of a gradual fuse mechanism, etc. Other similar methods or a combination of multiple methods may also be set to realize gradual fuse, which is not specifically limited.

[0060] Optionally, the fuse part 13 includes an etching part for increasing the fusing speed of the fuse part.

[0061] The etched portion is formed by removing atoms or molecules on the surface of the material by chemical reaction or physical process, so that the material changes its morphology so that the fuse portion 13 forms a weak point with a weaker connection strength than the first conductive portion 11 and the second conductive portion 12. The etching process can be divided into chemical etching, physical etching or etching using both chemical and physical methods according to different methods used.

[0062] For example, Figure 4 As shown, the fuse part 13 includes an etching part, that is, the fuse part 13 is formed by the etching part, which can increase the fusing speed of the fuse part 13, so that when the internal gas pressure of the battery cell increases abnormally or abnormal conditions such as thermal runaway occur, the fuse part 13 can be melted under the influence of increased gas pressure or high temperature, thereby isolating the first conductive part 11 and the second conductive part 12, achieving pressure relief and cutting off the electrical connection between the battery cell and external components, reducing the risk of safety problems such as battery explosion, and improving safety of use.

[0063] In other embodiments, Figure 1 or Figure 5 As shown, the fuse part 13 may also include a plurality of etching parts and intervals between the plurality of etching parts, so as to form the above-mentioned first fuse part 131 and the second fuse part 132. The fuse part 13 is arranged around the first conductive part 11. When the air pressure or temperature inside the battery cell increases, the etching part is first melted and the pressure begins to be released. The melting of the plurality of etching parts weakens the connection strength of the intervals between the plurality of etching parts. Under the impact of the air pressure inside the battery cell, the intervals between the plurality of etching parts are broken, and the fuse part 13 is completely melted, so as to realize the interruption of the current between the first conductive part 11 and the second conductive part 12. By setting the intervals between the etching part and the plurality of etching parts, it is convenient to process and to more accurately control the melting timing of the fuse part 13, so as to realize gradual melting.

[0064] In other embodiments, the fuse part may also be a metal material or alloy having a lower melting point than the first conductive part and the second conductive part, so as to control the connection or disconnection between the first conductive part and the second conductive part through the fuse part.

[0065] Optionally, the battery further includes a first bus bar 02 , which is disposed around and electrically connected to the outer periphery of the second conductive portion 12 , and is also electrically connected to an external element.

[0066] The first busbar 02 is disposed around and electrically connected to the outer periphery of the second conductive portion 12 to facilitate achieving a busbar effect so that current flows evenly between the explosion-proof valve 01 and external components.

[0067] Alternatively, if Figure 1As shown, the first conducting portion 11, the fuse portion 13, and the second conducting portion 12 of the explosion-proof valve 01 are integrally arranged. For example, the center position of the first conducting portion 11 can be electrically contacted with the battery cell by welding, and a notch is formed on the fuse portion 13 by etching. The depth and shape of the notch can be adjusted according to the strength requirements, so that the fuse portion 13 can be gradually fused when the gas pressure or temperature inside the battery cell is too high; optionally, on this basis, the welding process of the welding area 111 can be further controlled to achieve the gas pressure inside the battery cell. When the current is too high or the temperature is too high, the welding area 111 gradually bulges, which can also increase the resistance between the conductor of the battery cell and the first conductive part 11 of the explosion-proof valve 01, thereby further improving the current-breaking effect of the explosion-proof valve 01 in this case, and the temperature rise caused by the increase in resistance can further assist the fuse part 13 to achieve melting; further, the first busbar 02 is an annular busbar, which can better achieve the current collection effect, and it is easier to achieve the electrical connection between the second conductive part 12 and the external components, thereby improving the uniformity of current distribution.

[0068] Alternatively, if Figure 1 As shown, the first busbar 02 includes an annular busbar area 21 and a guide area 22, wherein the annular busbar area 21 surrounds and is electrically connected to the outer periphery of the second conductive portion 12, and the guide area 22 is electrically connected to an external element, so as to facilitate busbar and guide.

[0069] Alternatively, if Figure 1 As shown, the explosion-proof valve 01 is a circular explosion-proof valve, the first busbar 02 is a circular annular busbar, the first busbar 02 is arranged around and electrically connected to the outer periphery of the second conductive portion 12, and the welding area 111 is located at the center of the circular explosion-proof valve. The circular structure is more evenly stressed and the current distribution is more even.

[0070] Optionally, the specific shapes of the explosion-proof valve 01 and the first busbar 02 can be adjusted according to actual needs such as the module shape of the battery cell, for example, they can also be square, etc., which is not specifically limited.

[0071] Optionally, the battery cell includes an aluminum shell battery cell, the explosion-proof valve 01 includes a positive explosion-proof valve 01, the conductor includes a positive pole ear, the first busbar 02 includes a first positive busbar, the positive pole ear is welded to the center position of the first conductive portion 11 of the positive explosion-proof valve 01, and is connected to the positive electrode pole piece of the battery cell, the second conductive portion 12 of the positive explosion-proof valve 01 is electrically connected to the first positive pole busbar, and the first positive pole busbar is electrically connected to the positive pole column of the battery. Optionally, the positive explosion-proof valve 01 is an aluminum explosion-proof plate.

[0072] Specifically, the current flows into the welding area 111 of the first conductive part 11 of the positive explosion-proof valve 01 through the positive electrode ear, and then flows through the sub-conductive area 112 of the first conductive part 11 of the positive explosion-proof valve 01, and then flows through the fuse part 13 of the positive explosion-proof valve 01, and then flows through the second conductive part 12 of the positive explosion-proof valve 01, and then flows into the first positive busbar, and then reaches the positive electrode column of the battery.

[0073] In other embodiments, an explosion-proof valve with a similar structure may also be provided at the negative electrode of the battery. The specific implementation manner may refer to the above embodiments, which will not be described in detail here.

[0074] The present application further proposes an explosion-proof valve, such as Figures 1 to 4 As shown, the explosion-proof valve 01 is used to be installed outside the battery cell. The explosion-proof valve 01 includes a first conductive part 11, a fuse part 13, and a second conductive part 12. The first conductive part 11 is electrically contacted with the battery cell, the second conductive part 12 is electrically connected to an external element, and the fuse part 13 connects or disconnects the first conductive part 11 and the second conductive part 12.

[0075] The specific implementation and working principle of the explosion-proof valve 01 can be found in the above-mentioned embodiment and will not be described in detail here.

[0076] The explosion-proof valve 01 installed outside the battery cell in this embodiment is provided with a fuse part 13, and the fuse part 13 can connect the first conductive part 11 and the second conductive part 12, so that the battery cell can be electrically connected to the external element through the first conductive part 11, the fuse part 13 and the second conductive part 12 of the explosion-proof valve 01; the fuse part 13 is separately arranged from the first conductive part 11, and the electrical connection structure of the explosion-proof valve 01 and the battery cell and the separation of the current cut-off pressure relief structure of the explosion-proof valve 01 can be realized, so that the stability of the electrical connection structure of the explosion-proof valve 01 and the battery cell can be improved, and the anti-interference ability of the battery during normal charging and discharging can be improved. force, and can improve the control accuracy of the fuse 13 when it blows, so that when the internal gas pressure of the battery cell increases abnormally or thermal runaway occurs, the fuse 13 can be blown under the influence of increased gas pressure or high temperature, thereby isolating the first conductive part 11 and the second conductive part 12, achieving pressure relief and cutting off the electrical connection between the battery cell and external components, reducing the risk of safety problems such as battery explosion, and improving the safety of use; further, by setting an explosion-proof valve 01, when the battery is overcharged, it can not only achieve pressure relief, but also achieve current interruption, with a simple structure and the number of components can be reduced. Therefore, this embodiment can achieve pressure relief and current interruption functions at the same time through the explosion-proof valve 01, which can improve the safety of battery use, reduce the number of components, and has a simple structure.

[0077] Different from the prior art, the present application installs an explosion-proof valve outside the battery cell, and the fuse part can connect the first conductive part and the second conductive part, so the battery cell can be electrically connected to the external element through the first conductive part, the fuse part, and the second conductive part of the explosion-proof valve; the fuse part is separately arranged from the first conductive part, so that the electrical connection structure of the explosion-proof valve and the battery cell and the explosion-proof valve flow cut-off and pressure relief structure can be separated, so that the stability of the electrical connection structure of the explosion-proof valve and the battery cell can be improved, and the anti-interference ability of the battery during normal charging and discharging can be improved, and the control accuracy of the timing of the fuse part fusing can be improved, so that when the internal air pressure of the battery cell increases abnormally or abnormal conditions such as thermal runaway occur, the fuse part can be melted under the influence of increased air pressure or high temperature, thereby isolating the first conductive part and the second conductive part, achieving pressure relief and cutting off the electrical connection between the battery cell and the external element, reducing the risk of safety problems such as battery explosion, and improving the safety of use; further, by setting the explosion-proof valve, when the battery is overcharged, not only pressure relief can be achieved, but also flow cut-off can be achieved, the structure is simple, and the number of components can be reduced. Therefore, the present application can further improve the safety of battery use, reduce the number of components, and simplify the structure.

[0078] It is worth noting that the drawings in this article are only intended to illustrate the structural relationship and connection relationship of the product of the present application, and do not limit the specific structural dimensions of the product of the present application.

[0079] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An explosion-proof valve, characterized in that: Used to be installed outside the battery cell, the explosion-proof valve includes: a first conducting part, a fuse part, and a second conducting part. The first conducting part is arranged in electrical contact with the battery cell, the second conducting part is electrically connected to an external element, and the fuse part connects or disconnects the first conducting part and the second conducting part.

2. The explosion-proof valve according to claim 1, characterized in that: The battery cell comprises a shell with an opening, an electrode assembly and a conductor arranged in the shell, and the conductor is electrically connected to the electrode assembly; The first conductive portion is provided with a welding area and a sub-conductive area surrounding the welding area, the welding area is electrically connected to the conductor, the sub-conductive area covers the opening, and the fuse connects or disconnects the sub-conductive area and the second conductive portion.

3. The explosion-proof valve according to claim 2, characterized in that: The fuse portion is disposed around the outer periphery of the sub-conducting region, and the second conductive portion is disposed around the outer periphery of the fuse portion.

4. The explosion-proof valve according to claim 3, characterized in that: The fuse part includes a first fuse part and a second fuse part which are arranged at an interval, and the first fuse part and the second fuse part have different fusing timings.

5. The explosion-proof valve according to any one of claims 1 to 4, characterized in that: The fuse portion includes an etching portion for increasing a fusing speed of the fuse portion.

6. The explosion-proof valve according to claim 2, characterized in that: The welding area is located at the center of the sub-conducting area.

7. The explosion-proof valve according to claim 1, characterized in that: The first conducting portion is recessed toward the battery cell relative to the fuse portion.

8. A battery, characterized in that: include: Battery cells, The explosion-proof valve according to any one of claims 1 to 7 is installed outside the battery cell.

9. The battery according to claim 8, characterized in that The first conducting portion is electrically contacted with the battery core by welding, pressing or bonding with a conductive adhesive.

10. The battery according to claim 8, characterized in that The battery further includes a first bus bar, which is disposed around and electrically connected to an outer circumference of the second conductive portion, and is also electrically connected to the external element.

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