Battery top cover safety valve structure, assembling method and battery

Abstract

The invention discloses a battery top cover safety valve structure, an assembling method and a battery, and belongs to the technical field of batteries, the battery top cover safety valve structure comprises a top cover with a first side face and a second side face, the top cover comprises a protruding part, and an outer welding annular groove is formed in the connecting position of the protruding part and the second side face; an inner welding annular groove, a first anti-explosion valve, a second anti-explosion valve and a second anti-explosion valve with a weak area are arranged on the protruding part of the protruding part, the protruding part protrudes from the second side face to the direction close to the first side face, and the protruding part of the protruding part protrudes out of the first side face; the first anti-explosion valve is arranged in the inner welding annular groove; the second anti-explosion valve is arranged in the outer welding annular groove, so that a containing cavity used for containing functional additives is defined by the second anti-explosion valve, the protruding part and the first anti-explosion valve. According to the invention, the technical effect of improving the safety and reliability of the battery under the thermal runaway condition can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a battery top cover safety valve structure, an assembly method and a battery. Background Art

[0002] As an indispensable component of new energy equipment, battery products have been widely used in people's vision and life, and are widely used in electric vehicles, household energy storage equipment, portable batteries and digital batteries. With the close connection between batteries and people's daily life, battery safety has become one of the most critical factors. When a short circuit or other abnormal conditions occur in the battery, resulting in thermal runaway, a large amount of heat and gas will be generated inside the battery in a short time. If effective protective measures are not taken, the battery may burn or even explode, posing a huge threat to people's life and property safety. At present, in battery technology, an explosion-proof valve is usually set on the battery. When the air pressure inside the battery reaches a certain critical value, the explosion-proof valve will open under the pressure of the gas, allowing the high-temperature gas inside the battery to be released from the explosion-proof valve, which can prevent the battery from exploding to a certain extent. However, when the air pressure inside the battery rises due to thermal runaway, although a single explosion-proof valve can release the internal pressure to a certain extent, it has defects such as short valve opening time, failure to remind users in time, failure to effectively prevent subsequent combustion of the battery, and susceptibility to external damage leading to battery failure, which will also reduce the performance in delaying the spread of thermal runaway and enhancing battery reliability.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is the poor safety and reliability of batteries in the case of thermal runaway.

[0005] To solve the above technical problems, the present invention provides a battery top cover safety valve structure, the battery top cover safety valve structure comprising: a top cover having a first side surface and a second side surface, the top cover comprising a raised portion, an outer welding annular groove is arranged at the connection between the raised portion and the second side surface, an inner welding annular groove is arranged at the raised portion of the raised portion, a first explosion-proof valve, a first explosion-proof valve, and a second explosion-proof valve having a weak area, the raised portion protrudes from the second side surface toward the first side surface, and the raised portion of the raised portion protrudes from the first side surface; the first explosion-proof valve is arranged in the inner welding annular groove; the second explosion-proof valve is arranged in the outer welding annular groove, so that a receiving cavity for placing functional additives is formed by the second explosion-proof valve, the raised portion and the first explosion-proof valve, wherein the functional additives include protective inhibitors or electrolytes, and the number of the weak areas is multiple, and the multiple weak areas are distributed in an array.

[0006] Optionally, the protective inhibitor comprises a flame retardant or a degassing agent or a fire extinguishing agent.

[0007] Optionally, the first explosion-proof valve and the raised portion of the raised portion are integrally formed, and the first explosion-proof valve is a weak section relative to the raised portion.

[0008] Optionally, the battery top cover safety valve structure also includes: a positive electrode column and a positive electrode plastic sleeved on the positive electrode column, and a negative electrode column and a negative electrode plastic sleeved on the negative electrode column, the positive electrode column is connected to the top cover, and the positive electrode column passes through the first side surface and the second side surface; the negative electrode column is connected to the top cover, and the negative electrode column passes through the first side surface and the second side surface, and the protrusion is located between the positive electrode column and the negative electrode column.

[0009] Optionally, the battery top cover safety valve structure also includes: a protective patch, a lower plastic, and two sealing rings respectively connected to the positive electrode column and the negative electrode column, the protective patch is attached to the first explosion-proof valve, and the protective patch is located outside the accommodating cavity; the lower plastic is connected to the top cover, and the sealing ring is located between the lower plastic and the top cover.

[0010] Optionally, when viewed from a direction perpendicular to the first side surface, a height of the raised portion of the raised portion is smaller than a height of the positive electrode column, and a height of the raised portion of the raised portion is smaller than a height of the negative electrode column.

[0011] According to another aspect of the present invention, the present invention further provides a battery, comprising the battery top cover safety valve structure.

[0012] According to another aspect of the present invention, the present invention also provides an assembly method of a battery top cover safety valve structure, the assembly method includes the battery top cover safety valve structure, the assembly method also includes: stamping a convex portion on the second side surface of the top cover, the convex portion protrudes from the second side surface toward the first side surface of the top cover, wherein the height of the convex portion of the convex portion is less than the height of the positive pole arranged on the top cover, and the height of the convex portion of the convex portion is less than the height of the negative pole arranged on the top cover; at the connection between the convex portion and the second side surface, an outer welding annular groove is formed by stamping; at the convex portion of the convex portion, an inner welding annular groove is formed by stamping; a first explosion-proof valve is installed in the inner welding annular groove; a functional additive is placed in the convex portion, and a second explosion-proof valve having a weak area is welded to the outer welding annular groove, so that the functional additive is sealed in the accommodating cavity formed by the second explosion-proof valve, the convex portion and the first explosion-proof valve, wherein the functional additive includes a protective inhibitor or an electrolyte, and the protective inhibitor includes a flame retardant or a gas extinguishing agent or a fire extinguishing agent.

[0013] Optionally, installing the first explosion-proof valve in the inner welding annular groove includes: welding the first explosion-proof valve to the inner welding annular groove so that the first explosion-proof valve is connected to the raised portion of the raised portion; or, integrally forming the first explosion-proof valve with the raised portion of the raised portion, and making the first explosion-proof valve a weak section relative to the raised portion.

[0014] Optionally, the assembly method further includes: arranging the plastic sleeve on the positive electrode on the positive electrode column arranged on the top cover, the positive electrode column respectively passes through the first side surface and the second side surface of the top cover, and the first side surface is located between the plastic sleeve on the positive electrode and the second side surface; arranging the plastic sleeve on the negative electrode on the negative electrode column arranged on the top cover, the negative electrode column respectively passes through the first side surface and the second side surface of the top cover, and the first side surface is located between the plastic sleeve on the negative electrode and the second side surface; installing sealing rings on the positive electrode column and the negative electrode column respectively, and the second side surface is located between the sealing ring and the first side surface; attaching a protective patch on the first explosion-proof valve, and the protective patch is located outside the accommodating cavity, so as to protect the first explosion-proof valve by the protective patch.

[0015] Beneficial effects:

[0016] The present invention provides a battery top cover safety valve structure, wherein a protrusion protrudes from the second side surface of the top cover toward the direction close to the first side surface, and the protrusion portion of the protrusion protrudes from the first side surface, an outer welding annular groove is provided at the connection between the protrusion portion and the second side surface, and an inner welding annular groove is provided at the protrusion portion of the protrusion portion. A first explosion-proof valve is provided in the inner welding annular groove, and a second explosion-proof valve having a weak area is provided in the outer welding annular groove, so that a receiving cavity for placing functional additives is formed by the second explosion-proof valve, the protrusion portion and the first explosion-proof valve, wherein the functional additives include protective inhibitors or electrolytes, and the number of weak areas is multiple, and the multiple weak areas are distributed in an array. In this way, when the battery undergoes thermal runaway and generates high-pressure gas, the weak area of ​​the second explosion-proof valve is first broken due to the lower burst value, and a burst sound is generated at this time to remind the battery user that thermal runaway of the battery has occurred. At the same time, after the weak area of ​​the second explosion-proof valve is opened under the action of gas pressure, the functional additives in the accommodating cavity will be released and mixed into the battery, not only reminding the battery user through sound, but also effectively delaying the thermal runaway process of the battery through the release of flame retardant substances, providing more reaction time for battery users, reducing losses, and preventing heat spread and diffusion. And as the internal pressure of the battery continues to increase, the first explosion-proof valve will then break open, releasing the high-pressure gas inside the battery in time to prevent the battery from burning and exploding, which is beneficial to improving safety. Thereby achieving the technical effect of improving the safety and reliability of the battery in the case of thermal runaway. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of a battery top cover safety valve structure provided in an embodiment of the present invention.

[0019] Figure 2 A schematic structural diagram of an accommodating cavity in a battery top cover safety valve structure provided by an embodiment of the present invention.

[0020] Figure 3 A schematic structural diagram of an inner welded annular groove in a battery top cover safety valve structure provided by an embodiment of the present invention.

[0021] Figure 4 A schematic structural diagram of a second explosion-proof valve in a battery top cover safety valve structure provided by an embodiment of the present invention.

[0022] Figure 5The present invention provides a flowchart of a method for assembling a battery top cover safety valve structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The embodiments of the present application 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 only used to explain the present application, and cannot be understood as limiting the present application.

[0024] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with 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 of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0025] In the embodiments of the present application, at least one refers to one or more; multiple refers to two or more. In the description of the present application, the words "first", "second", "third", etc. are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order.

[0026] References to "one embodiment" or "some embodiments" etc. described in this specification mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, in this specification, the terms "include", "comprise", "have" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways. It should be noted that in the embodiments of the present application, "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0027] It should be pointed out that in the embodiments of the present invention, when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. At the same time, "connection" in the embodiments of the present application can also be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, A is connected to B, which can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components. The terms "vertical", "horizontal", "left", "right" and similar expressions used in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the present invention.

[0028] A battery top cover 1 safety valve structure provided in the first embodiment of the present invention is shown in FIG. Figures 1 to 4 As shown, Figure 1 1 is a schematic structural diagram of a safety valve structure of a battery top cover 1 provided by an embodiment of the present invention. Figure 2 1 is a schematic diagram of the structure of the accommodating cavity 32 in the safety valve structure of the battery top cover 1 provided by an embodiment of the present invention. Figure 3 1 is a schematic structural diagram of an inner welding annular groove 15 in a safety valve structure of a battery top cover 1 provided by an embodiment of the present invention. Figure 4 It is a structural schematic diagram of a second explosion-proof valve 3 in a safety valve structure of a battery top cover 1 provided in an embodiment of the present invention. A battery top cover 1 safety valve structure provided by an embodiment of the present invention includes a top cover 1, a raised portion 13, a first explosion-proof valve 2 and a second explosion-proof valve 3, the top cover 1 has a first side surface 11 and a second side surface 12, the raised portion 13 protrudes from the second side surface 12 in a direction close to the first side surface 11, and a raised portion 131 of the raised portion 13 protrudes from the first side surface 11, an outer welding annular groove 14 is provided at the connection between the raised portion 13 and the second side surface 12, an inner welding annular groove 15 is provided at the raised portion 131 of the raised portion 13, the first explosion-proof valve 2 is provided in the inner welding annular groove 15, the second explosion-proof valve 3 has a weak area 31, and the second explosion-proof valve 3 is provided in the outer welding annular groove 14, so that the second explosion-proof valve 3, the raised portion 13 and the first explosion-proof valve 2 are enclosed to form a receiving chamber 32, the receiving chamber 32 is used to place functional additives, and the functional additives include protective inhibitors or electrolytes, the number of weak areas 31 is multiple, and the multiple weak areas 31 are distributed in an array.

[0029] Among them, the interior of the accommodating chamber 32 has a space for accommodating functional additives, and the first side 11 and the second side 12 are two opposite sides of the top cover 1, such as the first side 11 refers to a side located at the top of the top cover 1, and the second side 12 refers to a side located at the bottom of the top cover 1. The weak area 31 on the second explosion-proof valve 3 has a lower explosion value and can respond first when the internal pressure of the battery increases abnormally. Providing a protective inhibitor in the accommodating chamber 32 can effectively inhibit the chemical reaction during the thermal runaway of the battery, or providing an electrolyte in the accommodating chamber 32 can supplement the electrolyte lost by the battery due to thermal runaway to a certain extent. Multiple weak areas 31 are distributed in an array manner, which will ensure the uniformity and reliability of the second explosion-proof valve 3 when it is opened, and also increase the recognition of the blasting sound, so that the battery user can detect abnormal conditions in time.

[0030] In this embodiment, the protrusion 13 protrudes from the second side 12 of the top cover 1 toward the direction close to the first side 11, and the protrusion 131 of the protrusion 13 protrudes from the first side 11, and an outer welding annular groove 14 is provided at the connection between the protrusion 13 and the second side 12, and an inner welding annular groove 15 is provided at the protrusion 131 of the protrusion 13. The first explosion-proof valve 2 is provided in the inner welding annular groove 15, and the second explosion-proof valve 3 with a weak area 31 is provided in the outer welding annular groove 14, so that the second explosion-proof valve 3, the protrusion 13 and the first explosion-proof valve 2 enclose a receiving cavity 32 for placing functional additives, wherein the functional additives include protective inhibitors or electrolytes, and the number of weak areas 31 is multiple, and the multiple weak areas 31 are distributed in an array. In this way, when the battery has thermal runaway and generates high-pressure gas, the weak area 31 of the second explosion-proof valve 3 is first broken due to the lower explosion value, and a burst sound is generated at this time to remind the battery user that the battery has thermal runaway. At the same time, after the weak area 31 of the second explosion-proof valve 3 is opened under the action of gas pressure, the functional additives in the accommodating chamber 32 will be released and mixed into the battery, not only reminding the battery user through sound, but also effectively delaying the thermal runaway process of the battery through the release of flame retardant substances, providing more reaction time for the battery user, reducing losses, and preventing heat spread and diffusion. And as the internal pressure of the battery continues to increase, the first explosion-proof valve 2 will then break open, releasing the high-pressure gas inside the battery in time to prevent the battery from burning and exploding, which is beneficial to improving safety. Thereby achieving the technical effect of improving the safety and reliability of the battery in the case of thermal runaway.

[0031] As an embodiment, the protective inhibitor includes a flame retardant or a degassing agent or a fire extinguishing agent. When the battery experiences thermal runaway, the weak area 31 of the second explosion-proof valve 3 breaks first, releasing a blasting sound to alert the user. At this time, the flame retardant or degassing agent or fire extinguishing agent in the accommodating cavity 32 is rapidly released and mixed into the battery. Through the flame retardant properties of the flame retardant or degassing agent or fire extinguishing agent, the thermal runaway process of the battery is effectively delayed, the fire is prevented from spreading, and more time for the user to escape and respond is provided. As the internal pressure of the battery continues to increase, the first explosion-proof valve 2 will subsequently rupture, releasing high-pressure gas in time to prevent the battery from burning and exploding.

[0032] In some embodiments, the first explosion-proof valve 2 is integrally formed with the raised portion 131 of the raised portion 13, and the first explosion-proof valve 2 is a weak section relative to the raised portion 13. The weak section may refer to the first explosion-proof valve 2 being thinner than other parts of the raised portion 13, so that the first explosion-proof valve 2 can be more easily broken when the internal pressure of the battery increases, and the high-pressure gas can be released in time. At the same time, due to the integral formation of the first explosion-proof valve 2 and the raised portion 13, the integrity and stability of the structure will be enhanced. When the battery is thermally runaway, the second explosion-proof valve 3 is first broken to release the blasting sound and functional additives, and then the first explosion-proof valve 2 is broken, and the safety of the battery is improved under the joint action of the first explosion-proof valve 2 and the second explosion-proof valve 3.

[0033] In some embodiments, a battery top cover 1 safety valve structure provided by an embodiment of the present invention further includes a positive pole 4, a positive pole plastic 5, a negative pole 6 and a negative pole plastic 7, the positive pole plastic 5 is sleeved on the positive pole 4, the positive pole 4 is connected to the top cover 1, and the positive pole 4 passes through the first side 11 and the second side 12. The negative pole plastic 7 is sleeved on the negative pole 6, the negative pole 6 is connected to the top cover 1, and the negative pole 6 passes through the first side 11 and the second side 12, and the protrusion 13 is located between the positive pole 4 and the negative pole 6. The positive pole 4 and the negative pole 6 are respectively connected to the top cover 1, and pass through the first side 11 and the second side 12 for charging and discharging of the battery. The protrusion 13 is located between the positive pole 4 and the negative pole 6 to ensure the compactness and stability of the internal structure of the battery. When the battery is thermally runaway, the second explosion-proof valve 3 and the first explosion-proof valve 2 are ruptured in sequence, not only releasing high-pressure gas, but also delaying the thermal runaway process through the functional additives in the accommodating chamber 32.

[0034] In some embodiments, a battery top cover 1 safety valve structure provided by an embodiment of the present invention further includes two sealing rings 8, a protective patch 9 and a lower plastic 10, the two sealing rings 8 are respectively connected to the positive pole 4 and the negative pole 6, the protective patch 9 is attached to the first explosion-proof valve 2, and the protective patch 9 is located outside the accommodating cavity 32. The lower plastic 10 is connected to the top cover 1, and the sealing ring 8 is located between the lower plastic 10 and the top cover 1. The lower plastic 10 may be provided with a hollow area facing the above-mentioned weak area 31. The protective patch 9 is attached to the first explosion-proof valve 2, and the protective patch 9 is located outside the accommodating cavity 32. The protective patch 9 is used to protect the first explosion-proof valve 2 from the external environment. The lower plastic 10 is connected to the top cover 1, which can provide additional support and protection for the battery. The sealing ring 8 is located between the lower plastic 10 and the top cover 1 to ensure the sealing inside the battery.

[0035] In some embodiments, when viewed from a direction perpendicular to the first side surface 11, the height of the raised portion 131 of the raised portion 13 is less than the height of the positive electrode column 4, and the height of the raised portion 131 of the raised portion 13 is less than the height of the negative electrode column 6, which can enhance the compactness and aesthetics of the safety valve structure of the battery top cover 1, and at the same time avoid the interference of the raised portion 13 with the positive electrode column 4 and the negative electrode column 6. When the battery is thermally runaway, the second explosion-proof valve 3 and the first explosion-proof valve 2 can rupture in a predetermined order, releasing high-pressure gas and functional additives, effectively improving the safety and reliability of the battery. In addition, since the height of the raised portion 13 is relatively low, it is also convenient to operate the battery during assembly and disassembly.

[0036] In order to explain a battery provided by the present invention in detail, the above-mentioned embodiment 1 explains a safety valve structure of a battery top cover 1 in detail. Based on the same inventive concept, the present application also provides a battery, see embodiment 2 for details.

[0037] A second embodiment of the present invention provides a battery, including the battery top cover 1 safety valve structure.

[0038] The present invention provides a battery, wherein a protrusion 13 protrudes from the second side surface 12 of the top cover 1 toward the direction close to the first side surface 11, and a protrusion 131 of the protrusion 13 protrudes from the first side surface 11, an outer welding annular groove 14 is provided at the connection between the protrusion 13 and the second side surface 12, and an inner welding annular groove 15 is provided at the protrusion 131 of the protrusion 13. A first explosion-proof valve 2 is provided in the inner welding annular groove 15, and a second explosion-proof valve 3 having a weak area 31 is provided in the outer welding annular groove 14, so that a receiving cavity 32 for placing functional additives is formed by the second explosion-proof valve 3, the protrusion 13 and the first explosion-proof valve 2, wherein the functional additives include protective inhibitors or electrolytes, and the number of weak areas 31 is multiple, and the multiple weak areas 31 are distributed in an array. In this way, when the battery has thermal runaway and generates high-pressure gas, the weak area 31 of the second explosion-proof valve 3 is first broken due to a lower burst value, and a burst sound is generated at this time to remind the battery user that the battery has thermal runaway. At the same time, after the weak area 31 of the second explosion-proof valve 3 is opened under the action of gas pressure, the functional additives in the accommodating chamber 32 will be released and mixed into the battery, not only reminding the battery user through sound, but also effectively delaying the thermal runaway process of the battery through the release of flame retardant substances, providing more reaction time for the battery user, reducing losses, and preventing heat spread and diffusion. And as the internal pressure of the battery continues to increase, the first explosion-proof valve 2 will then break open, releasing the high-pressure gas inside the battery in time to prevent the battery from burning and exploding, which is beneficial to improving safety. Thereby achieving the technical effect of improving the safety and reliability of the battery in the case of thermal runaway.

[0039] In order to explain in detail the assembly method of a battery top cover 1 safety valve structure provided by the present invention, the above-mentioned embodiment 1 explains in detail the battery top cover 1 safety valve structure. Based on the same inventive concept, the present application also provides an assembly method of a battery top cover 1 safety valve structure, see embodiment 3 for details.

[0040] See also Figure 5 , Figure 5 1 is a flowchart of an assembly method of a battery top cover 1 safety valve structure provided by an embodiment of the present invention. Embodiment 3 of the present invention provides an assembly method of a battery top cover 1 safety valve structure, the assembly method includes the battery top cover 1 safety valve structure, and the assembly method also includes the following steps:

[0041] Step S100, stamping a convex portion 13 on the second side surface 12 of the top cover 1, wherein the convex portion 13 protrudes from the second side surface 12 toward the first side surface 11 of the top cover 1, wherein a height of a convex portion 131 of the convex portion 13 is less than a height of the positive electrode column 4 provided on the top cover 1, and a height of the convex portion 131 of the convex portion 13 is less than a height of the negative electrode column 6 provided on the top cover 1;

[0042] Specifically, a protrusion 13 is formed by stamping on the second side surface 12 of the top cover 1, and the protrusion 13 protrudes from the second side surface 12 toward the first side surface 11 of the top cover 1, and the height of the protrusion portion 131 of the protrusion 13 is less than the height of the positive electrode column 4 and the negative electrode column 6 arranged on the top cover 1. The protrusion 131 may refer to the portion of the protrusion 13 protruding beyond the first side surface 11, and the interior of the protrusion 131 can provide sufficient space to accommodate the safety valve and functional additives to be installed in subsequent steps, and also provide a basis for the installation and setting of the outer welding annular groove 14 and the inner welding annular groove 15 in the following steps S200 and S300.

[0043] Step S200, forming an external welding annular groove 14 at the connection between the protrusion 13 and the second side surface 12 by stamping;

[0044] Specifically, through the above step S100, after the protrusion 13 is formed by stamping on the second side surface 12 of the top cover 1, an external welding annular groove 14 can be formed by stamping at the connection between the protrusion 13 and the second side surface 12. The external welding annular groove 14 provides positioning for the welding of the second explosion-proof valve 3 in the subsequent step S500, ensuring that the second explosion-proof valve 3 can be firmly installed on the top cover 1, and at the same time forms a part of the boundary of the accommodating cavity 32 to ensure the sealing of the accommodating cavity 32.

[0045] Step S300, forming an inner welding annular groove 15 in the convex portion 131 of the convex portion 13 by stamping;

[0046] Specifically, after the protrusion 13 is formed by stamping on the second side surface 12 of the top cover 1 through the above step S100, the inner welding annular groove 15 can be formed by stamping on the protruding portion 131 of the protrusion 13, and the inner welding annular groove 15 can be used to install the first explosion-proof valve 2 in the following step S400, that is, to provide positioning for the installation of the following first explosion-proof valve 2. And by installing the first explosion-proof valve 2 in the inner welding annular groove 15, the second explosion-proof valve 3 and the protrusion 13 are together enclosed to form the accommodating cavity 32. The depth and width of the above-mentioned outer welding annular groove 14 and the inner welding annular groove 15 can be adjusted as needed to ensure the firmness of the welding and the sealing of the accommodating cavity 32.

[0047] Step S400, installing the first explosion-proof valve 2 in the inner welding annular groove 15;

[0048] The step of installing the first explosion-proof valve 2 in the inner welding annular groove 15 includes: welding the first explosion-proof valve 2 to the inner welding annular groove 15 so that the first explosion-proof valve 2 is connected to the raised portion 131 of the raised portion 13; or, integrally forming the first explosion-proof valve 2 with the raised portion 131 of the raised portion 13, and making the first explosion-proof valve 2 a weak section relative to the raised portion 13.

[0049] Specifically, the first explosion-proof valve 2 is installed in the inner welding annular groove 15 to ensure that the first explosion-proof valve 2 can be effectively ruptured when needed to release high-pressure gas. There are two implementation methods for installing the first explosion-proof valve 2 on the inner welding annular groove 15. The first implementation method is to weld the first explosion-proof valve 2 on the inner welding annular groove 15 so that the first explosion-proof valve 2 is connected to the raised portion 131 of the raised portion 13, that is, the first explosion-proof valve 2 and the raised portion 131 of the raised portion 13 are designed as separate bodies, and the inner welding annular groove 15 of the raised portion 131 of the raised portion 13 and the first explosion-proof valve 2 are matched with each other. The first explosion-proof valve 2 can be welded on the inner welding annular groove 15, and the first explosion-proof valve 2 and the raised portion 131 of the raised portion 13 are separately processed, and then the first explosion-proof valve 2 is welded to the raised portion 131 of the raised portion 13, so that when the pressure rises abnormally, the raised portion 13 can be more easily broken through, the internal pressure can be quickly released, the equipment can be prevented from exploding, and the impact of the explosion-proof valve on the valve body itself during the opening process is reduced, thereby extending the service life of the explosion-proof valve. At the same time, the split design allows the raised portion 13 to be manufactured and processed separately, which helps to simplify the production process of the entire explosion-proof valve. The raised portion 13 can also be manufactured using different materials or processes to meet specific performance requirements, such as higher corrosion resistance, wear resistance or higher strength. The split design also helps to reduce manufacturing costs because it can more easily achieve mass production and standardized production. In addition, if the raised portion 13 is damaged or worn during use, the raised portion 13 can be replaced separately without replacing the entire explosion-proof valve, which is conducive to reducing maintenance costs. The second embodiment is to form the first explosion-proof valve 2 and the raised portion 131 of the raised portion 13 as one piece, and make the first explosion-proof valve 2 a weak section relative to the raised portion 13. The one-piece design eliminates the need for additional connectors or welding between the explosion-proof valve and the raised portion 13, which is conducive to reducing the risk of leakage caused by improper connection, and also enhances the integrity of the entire structure, making it more able to withstand external pressure and impact, and improving the stability and safety of the equipment. The design of the first explosion-proof valve 2 as a weak section relative to the protrusion 13 ensures that when the pressure rises abnormally, the explosion-proof valve can be broken first to quickly release the internal pressure and prevent the equipment from exploding. At the same time, no additional connection or welding steps are required, which can reduce uncertainty and potential quality problems in the production process.

[0050] Step S500, placing a functional additive in the raised portion 13, and welding the second explosion-proof valve 3 having a weak area 31 to the outer welding annular groove 14, so that the functional additive is sealed in the accommodating cavity 32 formed by the second explosion-proof valve 3, the raised portion 13 and the first explosion-proof valve 2, wherein the functional additive includes a protective inhibitor or an electrolyte, and the protective inhibitor includes a flame retardant or a degassing agent or a fire extinguishing agent.

[0051] Specifically, by placing the functional additive inside the protrusion 13, and welding the second explosion-proof valve 3 with the weak area 31 to the outer welding annular groove 14, the functional additive is placed in the accommodation chamber 32 formed by the protrusion 13, the first explosion-proof valve 2 and the second explosion-proof valve 3. Then the second explosion-proof valve 3 is welded to the outer welding annular groove 14 to seal the accommodation chamber 32 and ensure that the functional additive will not leak when the battery is working normally. The material and thickness of the first explosion-proof valve 2 and the second explosion-proof valve 3 can be selected according to factors such as the rated voltage, current and working environment of the battery to ensure that the first explosion-proof valve 2 and the second explosion-proof valve 3 can effectively break and release high-pressure gas when needed. When the battery has thermal runaway and generates high-pressure gas, the weak area 31 of the second explosion-proof valve 3 is first broken due to the lower explosion value, and a blasting sound is generated to remind the battery user. At the same time, the opening of the second explosion-proof valve 3 allows the functional additive in the accommodation chamber 32 to be quickly released and mixed into the battery, and the thermal runaway process of the battery is effectively delayed by the release of flame retardant substances. As the internal pressure of the battery continues to increase, the first explosion-proof valve 2 subsequently ruptures and opens, releasing high-pressure gas in time to prevent the battery from burning and exploding. It not only reminds the battery user through sound, but also provides the user with more reaction time through the release of functional additives, which can reduce losses and help prevent heat spread and diffusion.

[0052] Embodiment 3 of the present invention provides an assembly method for a safety valve structure of a battery top cover 1, which further includes the following steps: sleeve the positive electrode plastic 5 on the positive electrode column 4 provided on the top cover 1, the positive electrode column 4 respectively penetrates the first side 11 and the second side 12 of the top cover 1, and the first side 11 is located between the positive electrode plastic 5 and the second side 12; sleeve the negative electrode plastic 7 on the negative electrode column 6 provided on the top cover 1, the negative electrode column 6 respectively penetrates the first side 11 and the second side 12 of the top cover 1, and the first side 11 is located between the negative electrode plastic 7 and the second side 12; install a sealing ring 8 on the positive electrode column 4 and the negative electrode column 6, respectively, and the second side 12 is located between the sealing ring 8 and the first side 11; attach a protective patch 9 on the first explosion-proof valve 2, and the protective patch 9 is located outside the accommodating cavity 32, so as to protect the first explosion-proof valve 2 through the protective patch 9.

[0053] Specifically, first, the positive electrode plastic 5 is sleeved on the positive electrode column 4 of the top cover 1, and the first side 11 is located between the positive electrode plastic 5 and the second side 12, to ensure good electrical contact between the positive electrode column 4 and the positive electrode active material inside the battery. At the same time, the negative electrode plastic 7 is sleeved on the negative electrode column 6 of the top cover 1, and the first side 11 is also located between the negative electrode plastic 7 and the second side 12, to ensure stable electrical connection between the negative electrode column 6 and the negative electrode active material inside the battery. Then, the sealing ring 8 is installed on the positive electrode column 4 and the negative electrode column 6 respectively, ensuring that the second side 12 is located between the sealing ring 8 and the first side 11, and the sealing ring 8 is used to prevent the electrolyte inside the battery from leaking, and at the same time, prevent external moisture and air from entering the battery, to ensure the safety and stability of the battery. A protective patch 9 is then attached to the first explosion-proof valve 2, and the protective patch 9 is located outside the accommodating chamber 32. The first explosion-proof valve 2 can be protected by the protective patch 9 to prevent the first explosion-proof valve 2 from being damaged during assembly or transportation. At the same time, the protective patch 9 can also prevent dust and impurities from entering the accommodating chamber 32, ensuring that the first explosion-proof valve 2 can be opened normally when needed.

[0054] In addition, when the plastic 5 on the positive electrode and the plastic 7 on the negative electrode are sleeved, heat shrinkage or cold shrinkage can be used to ensure the close fit between the plastic sleeve and the positive pole 4 and the negative pole 6 to improve the sealing performance. The material and size of the sealing ring 8 can be selected according to the type and working conditions of the battery to ensure that the sealing ring 8 has good elasticity and corrosion resistance, so as to extend the service life of the battery. The material of the protective patch 9 should have good weather resistance and corrosion resistance to ensure that the protective patch 9 will not deteriorate or fall off during long-term use. At the same time, the shape and size of the protective patch 9 should match the first explosion-proof valve 2 to ensure that the protective patch 9 can completely cover the first explosion-proof valve 2 and provide effective protection. When the battery has thermal runaway, the second explosion-proof valve 3 will first break due to the lower explosion value, and produce a bursting sound to remind the battery user. Then the functional additives located in the accommodating cavity 32 will be released and mixed into the interior of the battery, and the thermal runaway process of the battery will be effectively delayed by the release of flame retardant substances. As the internal pressure of the battery continues to increase, the first explosion-proof valve 2 will also rupture and open, releasing high-pressure gas in time to prevent the battery from burning and exploding, which is beneficial to improving the safety and reliability of the battery in the case of thermal runaway.

[0055] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A battery top cover safety valve structure, characterized in that: The battery top cover safety valve structure includes: a top cover having a first side surface and a second side surface, the top cover including a raised portion, an outer welding annular groove is arranged at the connection between the raised portion and the second side surface, an inner welding annular groove is arranged at the raised portion of the raised portion, a first explosion-proof valve, a first explosion-proof valve, and a second explosion-proof valve with a weak area, the raised portion protrudes from the second side surface toward the first side surface, and the raised portion of the raised portion protrudes from the first side surface; the first explosion-proof valve is arranged in the inner welding annular groove; the second explosion-proof valve is arranged in the outer welding annular groove, so that a containing cavity for placing functional additives is formed by the second explosion-proof valve, the raised portion and the first explosion-proof valve, wherein the functional additives include protective inhibitors or electrolytes, and the number of the weak areas is multiple, and the multiple weak areas are distributed in an array.

2. The battery top cover safety valve structure according to claim 1, characterized in that: The protective inhibitor includes a flame retardant or a degassing agent or a fire extinguishing agent.

3. The battery top cover safety valve structure according to claim 1, characterized in that: The first explosion-proof valve is integrally formed with the raised portion of the raised part, and the first explosion-proof valve is a weak section relative to the raised part.

4. The battery top cover safety valve structure according to claim 1, characterized in that: The battery top cover safety valve structure also includes: a positive electrode column and a positive electrode plastic sleeved on the positive electrode column, and a negative electrode column and a negative electrode plastic sleeved on the negative electrode column, the positive electrode column is connected to the top cover, and the positive electrode column passes through the first side surface and the second side surface; the negative electrode column is connected to the top cover, and the negative electrode column passes through the first side surface and the second side surface, and the protrusion is located between the positive electrode column and the negative electrode column.

5. The battery top cover safety valve structure according to claim 4, characterized in that: The battery top cover safety valve structure also includes: a protective patch, a lower plastic, and two sealing rings respectively connected to the positive pole and the negative pole, the protective patch is attached to the first explosion-proof valve, and the protective patch is located outside the accommodating cavity; the lower plastic is connected to the top cover, and the sealing ring is located between the lower plastic and the top cover.

6. The battery top cover safety valve structure according to claim 4, characterized in that: When viewed from a direction perpendicular to the first side surface, a height of the raised portion of the raised portion is smaller than a height of the positive electrode column, and a height of the raised portion of the raised portion is smaller than a height of the negative electrode column.

7. A battery, characterized in that: It comprises the battery top cover safety valve structure as claimed in any one of claims 1 to 6.

8. A method for assembling a battery top cover safety valve structure, characterized in that: The assembly method comprises the battery top cover safety valve structure according to any one of claims 1 to 6, and the assembly method further comprises: A protrusion is formed by stamping on the second side surface of the top cover, the protrusion protrudes from the second side surface toward the first side surface of the top cover, wherein the height of the protrusion portion of the protrusion is less than the height of the positive electrode column provided on the top cover, and the height of the protrusion portion of the protrusion is less than the height of the negative electrode column provided on the top cover; An external welding annular groove is formed by stamping at the connection between the protrusion and the second side surface; An inner welding annular groove is formed in the raised portion of the raised part by stamping; Installing the first explosion-proof valve in the inner welding annular groove; A functional additive is placed in the protruding portion, and a second explosion-proof valve having a weak area is welded to the outer welding annular groove, so that the functional additive is sealed in a containing cavity formed by the second explosion-proof valve, the protruding portion and the first explosion-proof valve, wherein the functional additive includes a protective inhibitor or an electrolyte, and the protective inhibitor includes a flame retardant or a gas extinguishing agent or a fire extinguishing agent.

9. The method for assembling the battery top cover safety valve structure according to claim 8, characterized in that: The step of installing the first explosion-proof valve in the inner welding annular groove comprises: welding the first explosion-proof valve to the inner welding annular groove so that the first explosion-proof valve is connected to the raised portion of the raised portion; or, integrally forming the first explosion-proof valve with the raised portion of the raised portion, and making the first explosion-proof valve a weak section relative to the raised portion.

10. The method for assembling a battery top cover safety valve structure according to claim 8, characterized in that: The assembly method further includes: arranging the positive electrode plastic sleeve on the positive electrode column arranged on the top cover, the positive electrode column respectively passes through the first side surface and the second side surface of the top cover, and the first side surface is located between the positive electrode plastic and the second side surface; arranging the negative electrode plastic sleeve on the negative electrode column arranged on the top cover, the negative electrode column respectively passes through the first side surface and the second side surface of the top cover, and the first side surface is located between the negative electrode plastic and the second side surface; installing sealing rings on the positive electrode column and the negative electrode column respectively, and the second side surface is located between the sealing ring and the first side surface; attaching a protective patch on the first explosion-proof valve, and the protective patch is located outside the accommodating cavity, so as to protect the first explosion-proof valve through the protective patch.

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