Battery and gas generating nail thereof

Abstract

The utility model relates to a battery and a gas production nail thereof. The gas production nail comprises a sealing cover, a nail body and a gas channel pipe, the sealing cover is used for being in sealing connection with a shell of the battery, and an air hole is formed in the sealing cover and used for being communicated with a liquid injection hole in the shell. The air hole is in sliding connection with the sealing cover in the axial direction so as to have a blocking position and an opening position. An air channel hole is formed in the air channel pipe, and the air channel pipe extends into the sealing cover so that the air channel hole can be communicated with the air hole. At the opening position, the air passage hole is communicated with the liquid injection hole. When liquid is injected into the battery cell in the battery, the nail body is pressed downwards to block the liquid injection hole, then the sealing cover is hermetically welded with the shell, and when gas production needs to be detected, only the nail body needs to be lifted upwards to open the liquid injection hole, and then gas in the gas channel hole is analyzed and detected. In other words, when the sealing cover is sealed and welded, the liquid injection hole is in a blocked state, and therefore the problem existing when aluminum nail welding is directly conducted under the condition that the liquid injection hole is not blocked can be avoided.

Description

Technical Field

[0001] This application relates to the technical field of battery production, and particularly to a battery and a gas-producing nail thereof. Background Art

[0002] Currently, lithium batteries are all liquid or semi-solid batteries. Since chemical reactions occur in the electrolyte during use to generate gas, lithium battery practitioners can optimize the battery system design through analysis and testing of gas production volume, gas components, gas production rate, etc. Currently, gas collection in the industry is carried out by collecting at the liquid injection hole on the battery housing.

[0003] In related technologies, to ensure subsequent gas collection, the liquid injection hole is usually not blocked by a nail body, and an aluminum nail is directly sealed and welded to the liquid injection hole.

[0004] However, since the electrolyte is volatile, directly welding the aluminum nail without blocking the liquid injection hole has problems of poor accuracy in gas production analysis and easy explosion. Utility Model Content

[0005] Based on this, in view of the problems existing in directly welding the aluminum nail without blocking the liquid injection hole, it is necessary to provide a battery and a gas-producing nail thereof.

[0006] A gas-producing nail, the gas-producing nail includes:

[0007] A sealing cover for sealing connection with the housing of the battery. An air hole is opened on the sealing cover, and the air hole is used to communicate with the liquid injection hole on the housing;

[0008] A nail body slidably connected to the sealing cover along the axial direction of the air hole to have a blocking position and an open position; and

[0009] An airway tube. An airway hole is opened in the airway tube, and the airway tube extends into the sealing cover so that the airway hole communicates with the air hole;

[0010] In the blocking position, the nail body is used to block the liquid injection hole; in the open position, the airway hole is used to communicate with the liquid injection hole through the air hole.

[0011] In one embodiment, the airway tube is fixedly connected to one end of the nail body away from the liquid injection hole, and the airway tube is slidably connected to the inner wall of the air hole.

[0012] In one embodiment, the air hole includes a groove section and a sliding section that are connected and coaxially opened. The notch of the groove section faces the nail body. The airway tube is slidably connected to the sliding section, and the diameter of the groove section is greater than the maximum outer diameter of the nail body.

[0013] In one embodiment, an exhaust port is formed in the airway tube, at least a part of the exhaust port is located in the groove section, and the exhaust port communicates with the airway hole.

[0014] In one embodiment, the diameter of the sliding section is smaller than the maximum outer diameter of the nail body.

[0015] In one embodiment, the sealing cover has a first stepped structure, the first stepped structure has an inclined surface, and the inclined surface is used for sealing connection with the inner wall of the housing;

[0016] Along the direction from the airway tube to the nail body, the inclined surface gradually approaches the air hole.

[0017] In one embodiment, along the radial direction of the sealing cover, the groove section is located inside the first stepped structure.

[0018] In one embodiment, a sealing sliding layer is provided on the inner wall of the air hole, and the sealing sliding layer is used for enabling the airway tube to slide in the air hole and for realizing sealing between the airway tube and the inner wall of the air hole.

[0019] In one embodiment, the nail body includes a guiding section and a mating section;

[0020] In the blocking position, the mating section is used for mating with the liquid injection hole to seal the liquid injection hole;

[0021] The guiding section is located on the side of the mating section away from the airway tube. At least one notch is formed in the guiding section. In the open position, the guiding section is used for mating with the liquid injection hole, and the airway hole is used for communicating with the liquid injection hole through the notch.

[0022] A battery includes a housing and a gas-producing nail. A liquid injection hole is formed in the housing. The sealing cover is hermetically connected to the housing. The air hole communicates with the liquid injection hole. In the open position, the airway hole is used for communicating with the liquid injection hole through the air hole.

[0023] For the above battery and its gas-producing nail, after injecting liquid into the battery core, press down the nail body to block the liquid injection hole, and then hermetically weld the sealing cover to the housing. When gas production needs to be detected, only need to lift the nail body to make the liquid injection hole communicate with the air hole and the airway hole in sequence, and then analyze and detect the gas in the airway hole. That is, in the present application, when the sealing cover is hermetically welded, the liquid injection hole is in a blocked state, so that the problem of inaccurate gas production analysis caused by air leakage before welding can be avoided; and the problem of cracks caused by rich gas during welding can be avoided; and the problem of inflammable and explosive caused by welding can be avoided. Description of the Drawings

[0024] Figure 1 Schematic diagram of the structure of the gas-generating nail in one embodiment.

[0025] Figure 2 Schematic diagram of the cross-sectional structure of a gas-generating nail in one embodiment.

[0026] Figure 3 It is a schematic diagram of the matching structure between the gas-generating nail and the shell when they are in the blocking position in one embodiment.

[0027] Figure 4 It is a schematic diagram of the matching structure between the gas generating nail and the shell when in the open position in one embodiment.

[0028] Figure numerals: 100, sealing cover; 110, air hole; 111, groove section; 112, sliding section; 130, first step structure; 131, inclined surface; 140, second step structure; 200, nail body; 210, introduction section; 211, notch; 220, fitting section; 300, airway tube; 310, airway hole; 320, exhaust port; 400, shell; 410, injection hole. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In addition, if the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In this application, unless otherwise clearly specified and limited, if there is a description such as a first feature being "on" or "under" a second feature, its meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0034] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0035] The lithium battery contains electrolyte, and chemical reactions will occur during the use of the electrolyte to generate gas. Lithium battery practitioners can optimize the battery system design through analysis and testing of gas production volume, gas components, gas production rate, etc.

[0036] When directly performing aluminum nail welding without plugging the liquid injection hole, at least the following problems exist:

[0037] (1) Since the electrolyte is volatile, gas loss will occur during the process from injecting the electrolyte into the battery cell to welding the aluminum nail, resulting in inaccurate subsequent gas generation analysis.

[0038] (2) Since the electrolyte also has the effect of accelerating gas generation at high temperatures, during the process of welding the aluminum nail, the high temperature of the laser will cause an abundance of gas at the weld seam, resulting in problems such as welding explosion points and micro-cracks. Moreover, under the working conditions of subsequent full-life cycle gas generation testing, there is a problem that crack air leakage affects the testing accuracy.

[0039] (3) Since the gas generated by the electrolyte contains toxic and harmful gases and is flammable and explosive at high temperatures, when directly welding the aluminum nail without blocking the injection hole, due to the huge gas concentration difference of the electrolyte inside and outside the injection hole, gas explosion is likely to occur instantly during welding, posing a risk to the health and safety of the operator.

[0040] Refer to Figures 1-4 In an embodiment of the present application, the gas-generating nail provided includes a sealing cap 100, a nail body 200, and an airway tube 300. The sealing cap 100 is used for sealing connection with the housing 400 of the battery. An air hole 110 is opened on the sealing cap 100, and the air hole 110 is used for communicating with the injection hole 410 on the housing 400. The axial direction of the air hole 110 is slidably connected to the sealing cap 100 to have a blocking position and an open position. An airway hole 310 is opened in the airway tube 300, and the airway tube 300 extends into the sealing cap 100 so that the airway hole 310 communicates with the air hole 110. In the blocking position, the nail body 200 is used for blocking the injection hole 410; in the open position, the airway hole 310 is used for communicating with the injection hole 410 through the air hole 110.

[0041] In this embodiment, after injecting the electrolyte into the battery cell, the nail body 200 is pressed down so that the nail body 200 blocks the injection hole 410, and then the sealing cap 100 is hermetically welded to the housing 400. When gas generation needs to be detected, only the nail body 200 needs to be lifted up, so that the gas in the battery cell passes through the injection hole 410, flows through the air hole 110 into the airway hole 310, and then analyzes and detects the gas in the airway hole 310, which can be used to optimize the battery. That is, when the sealing cap 100 is hermetically welded in the present application, the injection hole 410 is in a blocked state, thus avoiding the problem of inaccurate gas generation analysis caused by air leakage before welding; avoiding the crack problem caused by an abundance of gas during welding; and avoiding the problem of flammability and explosiveness caused during welding.

[0042] The housing 400 includes a top cover, and the sealing cap 100 is hermetically connected to the top cover. The nail body 200 is a sealing rubber nail. Specifically, the material of the nail body 200 is EPDM+PP rubber. The materials of the airway tube 300 and the sealing cap 100 are metals, specifically aluminum.

[0043] In some embodiments, the airway tube 300 is fixedly connected to one end of the nail body 200 away from the liquid injection hole 410, and the airway tube 300 is slidably connected to the inner wall of the air hole 110.

[0044] In this embodiment, the airway tube 300 is fixedly connected to the nail body 200, and the nail body 200 is slidably connected to the sealing cover 100 along the axial direction of the air hole 110 through the airway tube 300. Since the airway tube 300 extends into the sealing cover 100, that is, the other end of the airway tube 300 is located outside the sealing cover 100. When it is necessary to block or open the liquid injection hole 410, the airway tube 300 can be operated to drive the nail body 200 to slide axially relative to the liquid injection hole 410.

[0045] Of course, it can also be that both the nail body 200 and the airway tube 300 are slidably connected to the air hole 110 of the sealing cover 100.

[0046] In some other embodiments, the airway tube 300 is arranged at one end of the sealing cover 100 away from the nail body 200, and only the nail body 200 slides relative to the liquid injection hole 410 to open or block the liquid injection hole 410. When it is necessary to open the liquid injection hole 410, the gas in the battery cell sequentially flows through the liquid injection hole 410 and the air hole 110 into the airway tube 300, and the state of the battery cell can be monitored by detecting the gas in the airway tube 300. Specifically, the nail body 200 can be connected to the sealing cover 100 in a pressing and popping-up manner, so as to facilitate the switching of the sealing cover 100 between the blocking position and the opening position.

[0047] Further, in combination with Figure 2 , the air hole 110 includes a groove section 111 and a sliding section 112 that are connected and coaxially arranged. The notch of the groove section 111 faces the nail body 200, and the airway tube 300 is slidably connected to the sliding section 112. The diameter of the groove section 111 is larger than the maximum outer diameter of the nail body 200.

[0048] In this embodiment, the airway tube 300 is slidably connected to the sliding section 112 for driving the nail body 200 to move axially along the air hole 110. The diameter of the groove section 111 is larger than the maximum outer diameter of the nail body 200, and the groove section 111 is located at one end of the sliding section 112 close to the nail body 200. When the airway tube 300 drives the nail body 200 to move upward so that part of the liquid injection hole 410 is opened, the gas in the housing 400 flows from between the liquid injection hole 410 and the nail body 200 into the groove section 111, and then flows into the airway tube 300 from the flow section.

[0049] Secondly, the notch of the groove section 111 faces the nail body 200, and the groove section 111 can accommodate the gas overflowing from the liquid injection hole 410 during the welding process.

[0050] Furthermore, the diameter of the sliding section 112 is smaller than the maximum outer diameter of the nail body 200.

[0051] In this embodiment, the diameter of the sliding section 112 is smaller than the maximum outer diameter of the nail body 200. That is, when the airway tube 300 drives the nail body 200 to slide upward, the sliding section 112 can form a stop for the nail body 200 to prevent the nail body 200 from being completely withdrawn outside the sealing cover 100.

[0052] In some embodiments, combined with Figure 4 , an exhaust port 320 is formed in the airway tube 300. The exhaust port 320 is at least partially located in the groove section 111, and the exhaust port 320 communicates with the airway hole 310.

[0053] In this embodiment, the exhaust port 320 is at least partially located in the groove section 111. When the airway tube 300 drives the nail body 200 to move upward so that some of the liquid injection holes 410 are opened, the gas in the housing 400 flows from between the liquid injection holes 410 and the nail body 200 into the groove section 111, and then enters the airway tube 300 through the exhaust port 320 in the flow section.

[0054] In some embodiments, combined with Figure 1 and Figure 3 , the sealing cover 100 has a first stepped structure 130. The first stepped structure 130 has an inclined surface 131, and the inclined surface 131 is used for sealing connection with the inner wall of the housing 400. Along the direction from the airway tube 300 to the nail body 200, the inclined surface 131 gradually approaches the air hole 110.

[0055] In this embodiment, along the direction from the airway tube 300 to the nail body 200, the inclined surface 131 gradually approaches the air hole 110, so as to facilitate the embedding of the first stepped structure 130 into the housing 400. And through the setting of the inclined surface 131, it is convenient to increase the welding area between the sealing cover 100 and the housing 400 to increase the sealing effect.

[0056] Furthermore, the sealing cover 100 further includes a plurality of second stepped structures 140. And along the direction from the nail body 200 to the airway tube 300, the plurality of second stepped structures 140 gradually approach the airway tube 300. The plurality of second stepped structures 140 are provided to extend the sealing length between the sealing cover 100 and the airway tube 300.

[0057] Specifically, combined with Figure 3 , along the radial direction of the sealing cover 100, the groove section 111 is located inside the first stepped structure 130.

[0058] In this embodiment, the groove section 111 is located inside the first stepped structure 130, that is, there is no solid support (airway tube 300 or nail body 200) inside the first stepped structure 130, which is beneficial to quickly release the stress generated during the sealing welding, and thus ensure the welding quality.

[0059] In some embodiments, a sealing sliding layer is provided on the inner wall of the air hole 110. The sealing sliding layer is used to enable the airway tube 300 to slide within the air hole 110 and to achieve sealing between the airway tube 300 and the inner wall of the air hole 110.

[0060] Among them, the sealing sliding layer includes, but is not limited to, a polyester layer and a fluororubber ring.

[0061] In some embodiments, in combination Figure 1 , the nail body 200 includes an introduction section 210 and a mating section 220; in the blocking position, the mating section 220 is used to cooperate with the liquid injection hole 410 to seal the liquid injection hole 410; the introduction section 210 is located on the side of the mating section 220 away from the airway tube 300, and at least one notch 211 is formed in the introduction section 210. In the open position, the introduction section 210 is used to cooperate with the liquid injection hole 410, and the airway hole 310 is used to communicate with the liquid injection hole 410 through the notch 211.

[0062] In this embodiment, the outer diameter of the mating section 220 is greater than or equal to the outer diameter of the introduction section 210, that is, the outer diameter of the mating section 220 is the maximum outer diameter of the nail body 200. When the mating section 220 moves into the liquid injection hole 410, the mating section 220 is in interference fit with the liquid injection hole 410 to seal the liquid injection hole 410. When the introduction section 210 moves into the liquid injection hole 410, the gas inside the battery can flow through the notch 211 to the outside of the liquid injection hole 410, so as to facilitate the detection of gas production.

[0063] In addition, after the electrolyte injection of the battery cell is completed and before the sealing end cap is welded, it is also necessary to evacuate and refill with helium. At this time, evacuation and refilling with helium can be carried out through the notch 211 of the introduction section 210.

[0064] In some embodiments, the nail body 200, the airway tube 300, and the sealing cover 100 are coaxially arranged.

[0065] An embodiment of the present application further provides a battery, including a housing 400 and a gas-producing nail. A liquid injection hole 410 is formed in the housing 400. The gas-producing nail includes a sealing cover 100, a nail body 200, and an airway tube 300. The sealing cover 100 is sealingly connected to the housing 400. An air hole 110 is formed in the sealing cover 100, and the air hole 110 is communicated with the liquid injection hole 410; the axial direction of the air hole 110 is slidably connected to the sealing cover 100 to have a blocking position and an open position; an airway hole 310 is formed in the airway tube 300, and the airway tube 300 extends into the sealing cover 100; in the blocking position, the nail body 200 blocks the liquid injection hole 410; in the open position, the liquid injection hole 410 is opened, and the airway hole 310 is communicated with the liquid injection hole 410.

[0066] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0067] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A gas-generating nail, characterized in that: The gas-generating nail comprises: A sealing cover, used for sealingly connecting with the battery shell, the sealing cover is provided with an air hole, the air hole is used for communicating with the injection hole on the shell; a nail body, slidably connected to the sealing cover along the axial direction of the air hole to have a blocking position and an opening position; and An airway tube, wherein an airway hole is formed in the airway tube, and the airway tube extends into the sealing cover so that the airway hole is connected to the air hole; When in the blocking position, the nail body is used to block the injection hole; when in the open position, the airway hole is used to communicate with the injection hole through the air hole.

2. The gas-generating nail according to claim 1, characterized in that: The airway tube is fixedly connected to one end of the nail body away from the injection hole, and the airway tube is slidably connected to the inner wall of the air hole.

3. The gas-generating nail according to claim 2, characterized in that: The air hole includes a groove section and a sliding section which are interconnected and coaxially opened, the notch of the groove section faces the nail body, the airway tube is slidably connected to the sliding section, and the diameter of the groove section is larger than the maximum outer diameter of the nail body.

4. The gas-generating nail according to claim 3, characterized in that: An exhaust port is provided in the airway tube, and the exhaust port is at least partially located in the groove section, and the exhaust port is communicated with the airway hole.

5. The gas-generating nail according to claim 3, characterized in that: The diameter of the sliding section is smaller than the maximum outer diameter of the nail body.

6. The gas-generating nail according to claim 3, characterized in that: The sealing cover has a first step structure, the first step structure has an inclined surface, and the inclined surface is used for sealing connection with the inner wall of the housing; Along the direction from the airway tube to the nail body, the inclined surface gradually approaches the air hole.

7. The gas-generating nail according to claim 6, characterized in that: Along the radial direction of the sealing cover, the groove section is located inside the first step structure.

8. The gas-generating nail according to claim 1, characterized in that: The inner wall of the air hole is provided with a sealing sliding layer, and the sealing sliding layer is used to enable the airway tube to slide in the air hole and to achieve sealing between the airway tube and the inner wall of the air hole.

9. The gas-generating nail according to claim 1, characterized in that: The nail body comprises an introduction section and a matching section; When in the blocking position, the matching section is used to match with the liquid injection hole to seal the liquid injection hole; The introduction section is located on a side of the matching section away from the airway tube, and at least one notch is provided in the introduction section. When in the open position, the introduction section is used to match the injection hole, and the airway hole is used to communicate with the injection hole through the notch.

10. A battery, characterized in that: It comprises a shell and the gas-producing nail as described in any one of claims 1 to 9, wherein the shell is provided with an injection hole, the sealing cover is sealedly connected to the shell, and the air hole is communicated with the injection hole; when in the open position, the airway hole is used to communicate with the injection hole through the air hole.

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