Sealing plug and explosion-proof valve structure for bipolar battery

Abstract

The utility model discloses a sealing plug and anti-explosion valve structure for a bipolar battery, which relates to the technical field of batteries and comprises a plug head, a plug, a telescopic sleeve, a telescopic shaft, a spring, a boss and a valve cap, the chock plug is fixedly arranged at the bottom end of the boss, and the shape of the chock plug is matched with the outer port of the liquid injection hole; a cavity is formed in the plug head, the cavity is communicated with the liquid injection hole, and the plug is arranged in the cavity; the plug is in a cone frustum shape, the side wall of the plug is matched with the inner wall of the cavity, the plug is used for plugging the liquid injection hole, and the radius of the top end circle of the plug is larger than that of the bottom end circle; the telescopic sleeve is arranged at the middle axis of the boss, and the bottom end of the telescopic sleeve extends into the cavity and is fixedly arranged at the top end of the plug; the top end of the telescopic sleeve penetrates through the boss and extends to the position above the boss. The bottom end of the telescopic shaft is sleeved with the telescopic sleeve, and the top end of the telescopic shaft is fixedly arranged on the top of the valve bonnet. The telescopic shaft is sleeved with the spring, and the spring is installed between the telescopic sleeve and the valve bonnet. A plurality of exhaust holes are formed in the top end of the boss, and matched air hole covers are arranged on the exhaust holes.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a sealing plug and explosion-proof valve structure for a bipolar battery. Background Art

[0002] Bipolar batteries are composed of multiple sealed frames stacked together, with diaphragms and bipolar pole pieces installed in an alternating manner inside the sealed frames, and active materials of different polarities are coated on both sides of the bipolar pole pieces. It can be simply understood as a battery composed of multiple battery cells stacked in series, each battery cell consisting of a sealed frame, a bipolar pole piece and a diaphragm; this type of battery has the characteristics of high voltage, high energy density and high current capacity.

[0003] The sealing frame of the bipolar battery needs to have an injection hole for injecting electrolyte and also for discharging the gas that may be generated during pre-charging and charging. The injection hole port is installed with a sealing plug, which is used to block the injection hole to prevent the electrolyte from being discharged and to perform gas pressure relief at the same time.

[0004] However, in the prior art, commonly used battery exhaust structures are all developed based on the parallel structure inside the battery, which is not suitable for the structural model of the series connection inside the battery. It is easy to cause the gas generated by the chemical reaction of each layer of the pole piece of the bipolar battery to not be effectively discharged, causing gas accumulation inside the battery, affecting the gas pressure relief in the bipolar battery, resulting in explosion due to the inability to relieve pressure, reducing the safety of the bipolar battery; and the spring in the conventional sealing plug is exposed to the air or set in the injection hole, which is easy to cause the spring to be oxidized or corroded by the electrolyte, thereby causing pressure relief failure or electrolyte leakage.

[0005] Furthermore, in the prior art, the injection holes on the sealing frame are usually arranged in a single row or even a single row, which often brings a lot of inconvenience to the subsequent addition of electrolyte. Utility Model Content

[0006] In order to solve the problems in the background technology, the utility model provides a sealing plug for a bipolar battery to solve the technical problems of "first, the commonly used battery exhaust structure is developed based on the parallel structure inside the battery, which is not suitable for the structural model of the series connection inside the battery, which easily leads to the gas generated by the chemical reaction of each layer of the pole piece of the bipolar battery, and cannot be effectively discharged, thereby causing gas accumulation inside the battery, affecting the gas pressure relief in the bipolar battery, resulting in explosion due to the inability to relieve pressure, and reducing the safety of the bipolar battery; second, the spring in the conventional sealing plug is exposed to the air or arranged in the injection hole, which easily leads to the spring being oxidized or corroded by the electrolyte, thereby causing pressure relief failure or leakage of the electrolyte, and, in the prior art, the injection holes on the sealing frame are usually arranged in a single row or even a single manner, which often brings many inconveniences to the subsequent addition of electrolyte" and so on.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A sealing plug for a bipolar battery, comprising a plug head, a plug, a telescopic sleeve, a telescopic shaft, a spring, a boss and a valve cap;

[0009] The plug is fixedly arranged at the bottom end of the boss, and the shape of the plug is adapted to the outer end of the injection hole;

[0010] The plug head is provided with a cavity, the cavity is communicated with the injection hole, and the plug is arranged in the cavity;

[0011] The plug is in the shape of a truncated cone, the side wall of the plug is matched with the inner wall of the cavity, the plug is used to block the injection hole, and the radius of the top circle of the plug is greater than the radius of the bottom circle;

[0012] The telescopic sleeve is arranged at the central axis of the boss, the bottom end of the telescopic sleeve extends into the cavity and is fixedly arranged on the top end of the plug; the top end of the telescopic sleeve passes through the boss and extends to the top of the boss;

[0013] The bottom end of the telescopic shaft is sleeved in the telescopic sleeve, and the top end of the telescopic shaft is fixed to the top of the valve cap;

[0014] The spring is sleeved on the telescopic shaft, and the spring is installed between the telescopic sleeve and the valve cap;

[0015] The top of the boss is provided with a plurality of exhaust holes, and the exhaust holes are provided with matching air hole covers.

[0016] Beneficial effects of the above technical solution: Compared with the prior art, the sealing plug of the bipolar battery has made effective improvements to the overall structure and assembly method of the sealing plug, and the plug head is fixedly arranged at the bottom end of the boss, and the shape of the plug head is adapted to the outer port of the injection hole; in order to ensure the sealing of the bipolar battery, a battery exhaust structure is provided in the plug head: a plug, a telescopic sleeve, a telescopic shaft, a spring, a boss and a valve cap, and the plug, the telescopic sleeve, the telescopic shaft and the spring cooperate with each other to ensure that the gas generated by the chemical reaction of each layer of the bipolar battery can be effectively discharged, and to prevent the battery from leaking. Internal gas accumulation affects the gas pressure relief in the bipolar battery, resulting in explosion due to failure of pressure relief, thereby ensuring the safety of the bipolar battery; the spring is sleeved on the telescopic shaft, and the spring is installed between the telescopic sleeve and the valve cap to prevent the spring from being exposed to the air or set in the injection hole, which may easily cause the spring to be oxidized or corroded by the electrolyte, thereby causing pressure relief failure or electrolyte leakage; a plurality of exhaust holes are provided on the top of the boss, and matching pore covers are provided on the exhaust holes to prevent the leakage of the electrolyte, which may cause the electrolyte to cause different degrees of damage to the battery sealing frame.

[0017] In a preferred solution, a sealing ring is provided at the connection between the bottom end of the boss and the outer end of the liquid injection hole.

[0018] The above technical solution has the beneficial effect of: by providing a sealing ring at the connection between the bottom end of the boss and the outer port of the injection hole, the sealing between the sealing plug and the battery sealing frame is further ensured, and the leakage of electrolyte is further prevented, which causes the electrolyte to cause different degrees of damage to the battery sealing frame.

[0019] In a preferred solution, a fixing platform is provided at the top of the telescopic sleeve.

[0020] The above technical solution has the beneficial effect that a fixing platform is provided at the top of the telescopic sleeve to ensure that the telescopic length of the telescopic sleeve is within the telescopic range and has a fixing effect.

[0021] In a preferred solution, the bottom end of the spring is arranged on the fixing platform, and the top end of the spring is fixed to the lower end of the top of the valve cap.

[0022] The above technical solution has the beneficial effects of: through the compression of the spring, the telescopic shaft is ensured to be able to freely extend and retract in the retractable sleeve, and its arrangement method ensures that the spring will not be corroded by the electrolyte, further ensuring the sealing and safety of the bipolar battery.

[0023] In a preferred solution, the telescopic shaft and the valve cap are an integrated structure and are coaxially arranged with each other.

[0024] The above technical solution has the beneficial effect that the telescopic shaft and the valve bonnet are an integrated structure and are coaxially arranged with each other, thereby ensuring the connection strength and structural stability of the telescopic shaft and the valve bonnet.

[0025] In a preferred solution, the plug is in a truncated cone, a column or other shapes.

[0026] The above technical solution has the beneficial effect of: by setting the plug in a variety of shapes, the plug is ensured to be adapted to the injection holes on different battery sealing frames, and the sealing and safety of the bipolar battery are further ensured.

[0027] Preferably, the area of ​​the bottom end of the boss is larger than the area of ​​the top end.

[0028] The above technical solution has the beneficial effect of: by setting the boss to be larger at the bottom and smaller at the top, it is used to fix the mounting plate, and at the same time it is beneficial to the installation and fixation of the sealing ring, thereby further improving the sealing and safety of the bipolar battery.

[0029] In a preferred solution, the sealing plug is used to block the injection hole on the sealing frame; the sealing plug is pressed and fixed through the mounting hole of the pressing plate, and the pressing plate is connected to the bipolar battery housing.

[0030] The above technical solution has the beneficial effect that the liquid injection hole is sealed by the sealing plug, and the sealing plug is further pressed and fixed by the pressure plate, thereby further ensuring the sealing and safety of the bipolar battery.

[0031] Preferably, the inner diameter of the mounting hole is matched with the boss.

[0032] The above technical solution has the beneficial effect that the mounting hole and the boss are matched to each other, thereby further ensuring that the sealing plug is pressed and fixed through the mounting hole of the pressure plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A schematic diagram of the assembly of the sealing plug and the injection hole provided in Example 1 of the utility model;

[0035] Figure 2 A schematic diagram of the explosive assembly of the pressing plate, the sealing plug and the injection hole provided in Example 1 of the utility model;

[0036] Figure 3 A schematic diagram of the assembly of the pressing plate and the sealing plug provided in Example 1 of the utility model;

[0037] Figure 4 A schematic diagram of the pressing plate structure provided in Example 1 of the utility model;

[0038] Figure 5 A schematic diagram of the arrangement of the sealing plug and its assembly with the pressure plate provided in Example 1 of the utility model;

[0039] Figure 6 for Figure 5 The enlarged structural section view of the middle part A;

[0040] Figure 7 A top view of the arrangement of the injection holes provided in Example 2 of the utility model;

[0041] Description of reference numerals;

[0042] 1-plug; 2-plug; 3-telescopic sleeve; 4-telescopic shaft; 5-spring; 6-boss; 7-valve cap; 8-liquid injection hole; 9-cavity; 10-exhaust hole; 11-air hole cover; 12-sealing ring; 13-pressing plate; 14-mounting hole; 15-countersunk hole. DETAILED DESCRIPTION

[0043] Example 1

[0044] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments.

[0045] like Figures 1 to 6 As shown, a sealing plug for a bipolar battery comprises a plug head 1, a plug 2, a telescopic sleeve 3, a telescopic shaft 4, a spring 5, a boss 6 and a valve cap 7;

[0046] The plug 1 is fixedly arranged at the bottom end of the boss 6, and the shape of the plug 1 is adapted to the outer end of the injection hole 8;

[0047] A cavity 9 is provided in the plug head 1, the cavity 9 is communicated with the injection hole 8, and the plug 2 is arranged in the cavity 9;

[0048] The plug 2 is in the shape of a truncated cone, the side wall of the plug 2 is matched with the inner wall of the cavity 9, the plug 2 is used to block the injection hole 8, and the radius of the top circle of the plug 2 is greater than the radius of the bottom circle;

[0049] Specifically, the telescopic sleeve 3 is arranged at the central axis of the boss 6, the bottom end of the telescopic sleeve 3 extends into the cavity 9, and is fixedly arranged on the top end of the plug 2; the top end of the telescopic sleeve 3 penetrates the boss 6 and extends to the top of the boss 6;

[0050] Specifically, the bottom end of the telescopic shaft 4 is sleeved in the telescopic sleeve 3, and the top end of the telescopic shaft 4 is fixed to the top of the valve cap 7;

[0051] Specifically, the spring 5 is sleeved on the telescopic shaft 4, and the spring 5 is installed between the telescopic sleeve 3 and the valve cap 7;

[0052] Specifically, the top of the boss 6 is provided with a plurality of exhaust holes 10, and the exhaust holes 10 are provided with matching pore covers 11; by making effective improvements to the overall structure and assembly method of the sealing plug, the plug head 1 is fixedly arranged at the bottom end of the boss 6, and the shape of the plug head 1 is matched with the outer port of the injection hole 8; in order to ensure the sealing of the bipolar battery, a battery exhaust structure is provided in the plug head 1: the plug 2, the telescopic sleeve 3, the telescopic shaft 4, the spring 5, the boss 6 and the valve cap 7, and the plug 2, the telescopic sleeve 3, the telescopic shaft 4, and the spring 5 cooperate with each other to ensure that the gas generated by the chemical reaction of each layer of the pole piece of the bipolar battery can be effectively discharged, And prevent gas accumulation inside the battery, affect the gas pressure relief in the bipolar battery, resulting in explosion due to failure of pressure relief, thereby ensuring the safety of the bipolar battery; by sleeved spring 5 on telescopic shaft 4, and spring 5 installed between telescopic sleeve 3 and valve cap 7, to prevent spring 5 from being exposed to the air or set in the injection hole, which may easily cause spring 5 to be oxidized or corroded by electrolyte, thereby causing pressure relief failure or electrolyte leakage; by providing a plurality of exhaust holes 10 at the top of boss 6, and providing matching pore covers 11 on the exhaust holes 10, to prevent electrolyte from seeping out, causing electrolyte to cause different degrees of damage to the battery sealing frame.

[0053] In this embodiment, a sealing ring 12 is provided at the connection between the bottom end of the boss 6 and the outer port of the injection hole 8; by providing a sealing ring 12 at the connection between the bottom end of the boss 6 and the outer port of the injection hole 8, the sealing between the sealing plug and the battery sealing frame is further ensured, and the leakage of the electrolyte is further prevented, which causes the electrolyte to cause different degrees of damage to the battery sealing frame.

[0054] In this embodiment, a fixing platform is provided at the top of the telescopic sleeve 3. By providing a fixing platform at the top of the telescopic sleeve 3, it is ensured that the telescopic length of the telescopic sleeve 3 is within the telescopic range and has a fixing effect.

[0055] In this embodiment, the bottom end of the spring 5 is arranged on a fixed platform, and the top end thereof is fixed to the lower end of the top of the valve cap 7; the spring 7 is compressed to ensure that the telescopic shaft 4 can freely extend and retract in the retractable sleeve 3, and the arrangement method ensures that the spring 5 will not be corroded by the electrolyte, thereby further ensuring the sealing and safety of the bipolar battery.

[0056] In this embodiment, the telescopic shaft 4 and the valve cap 7 are an integrated structure and are coaxially arranged with each other; the telescopic shaft 4 and the valve cap 7 are an integrated structure and are coaxially arranged with each other to ensure the connection strength and structural stability of the telescopic shaft 4 and the valve cap 7.

[0057] In this embodiment, the plug 1 is in a truncated cone, a column or other shapes; by setting the plug 1 to a variety of shapes, it is ensured that the plug 1 is adapted to the injection holes 8 on different battery sealing frames, and further ensures the sealing and safety of the bipolar battery.

[0058] In this embodiment, the area of ​​the bottom end of the boss 6 is larger than the area of ​​the top end.

[0059] Example 2

[0060] like Figure 7 As shown, further optimization is performed based on the above embodiment 1:

[0061] The sealing frame of the bipolar battery is composed of multiple layers of plate frames stacked in an interlaced manner; and the injection holes 8 on the plate frames are located at different positions, so that three or more rows of injection holes 8 are formed on the stacked sealing frame, and the positions of the injection holes 8 are staggered in pairs without interfering with each other; and a larger countersunk hole 15 is formed at the outer port of the injection hole 8 to facilitate the injection of electrolyte.

[0062] By forming three or more rows of injection holes 8 on the sealing frame, it is ensured that the subsequent electrolyte can be easily added, thereby reducing the inconvenience caused by the single row or even single injection hole in the subsequent electrolyte addition.

[0063] Specifically, the injection holes 8 are each provided with a separate sealing plug, which is pressed and fixed by the mounting hole 14 of the pressure plate 13, and the pressure plate 13 is connected to the bipolar battery housing; the sealing plugs are designed with more than three rows, and each sealing plug works independently, which can realize a multi-layer pressure relief function, thereby preventing the explosion caused by excessive pressure in the battery and the inability to relieve pressure, thereby achieving an explosion-proof effect.

[0064] Example 3

[0065] like Figures 1 to 6 As shown, an explosion-proof valve structure for a bipolar battery, a sealing plug is used to seal the injection hole 8 on the sealing frame; the sealing plug is pressed and fixed by the mounting hole 14 of the pressing plate 13, and the pressing plate 13 is connected to the bipolar battery shell; the injection hole 8 is sealed and blocked by the sealing plug, and the sealing plug is further pressed and fixed by the pressing plate 13, so as to further ensure the sealing and safety of the bipolar battery.

[0066] In this embodiment, the inner diameter of the mounting hole 14 is matched with the boss 6; the mounting hole 14 and the boss 6 are arranged in a manner that is matched with each other, thereby further ensuring that the sealing plug is pressed and fixed through the mounting hole of the pressure plate.

[0067] In this embodiment, the plug 1 and the plug 2 are made of corrosion-resistant hard material to ensure that the plug 1 and the plug 2 will not be corroded by the electrolyte, which facilitates the displacement of the plug 2 in the cavity 9 of the plug 1, and further ensures the sealing and safety of the bipolar battery.

[0068] It should be noted that the "upper", "lower", "left", "right", "front" and "back" mentioned in this article to describe the direction do not refer to the direction unless otherwise specified, but are only for the convenience of description. The description of the product will be different if it is placed in a different direction. Any direction that can be understood by ordinary technicians in this field without making creative work belongs to the protection scope of this utility model.

[0069] Specific usage of this utility model:

[0070] Step 1: Put the sealing ring 12 on the plug 1;

[0071] Step 2: Insert the sealing plugs into the respective injection holes 8 on the sealing frame;

[0072] Step 3: Press and fix the sealing plugs of each row through the mounting holes 14 of the pressing plate 13;

[0073] Step 4: Adjust the sealing plug and check its stability, sealing and safety.

[0074] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0075] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention.

[0076] The above are only preferred implementations of the utility model. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the utility model, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should all be regarded as protection of the utility model.

Claims

1. A sealing plug for a bipolar battery, characterized in that: It comprises a plug head (1), a plug (2), a telescopic sleeve (3), a telescopic shaft (4), a spring (5), a boss (6) and a valve cap (7); The plug (1) is fixedly arranged at the bottom end of the boss (6), and the shape of the plug (1) is adapted to the outer end of the injection hole (8); The plug head (1) is provided with a cavity (9), the cavity (9) is communicated with the injection hole (8), and the plug (2) is arranged in the cavity (9); The plug (2) is in the shape of a truncated cone, the side wall of the plug (2) is adapted to the inner wall of the cavity (9), the plug (2) is used to seal the injection hole (8), and the radius of the top circle of the plug (2) is greater than the radius of the bottom circle; The telescopic sleeve (3) is arranged at the central axis of the boss (6), the bottom end of the telescopic sleeve (3) extends into the cavity (9) and is fixedly arranged on the top end of the plug (2); the top end of the telescopic sleeve (3) penetrates the boss (6) and extends to the top of the boss (6); The bottom end of the telescopic shaft (4) is sleeved in the telescopic sleeve (3), and the top end of the telescopic shaft (4) is fixed to the top of the valve cap (7); The spring (5) is sleeved on the telescopic shaft (4), and the spring (5) is installed between the telescopic sleeve (3) and the valve cap (7); A plurality of exhaust holes (10) are provided at the top end of the boss (6), and matching exhaust holes (10) are provided on the exhaust holes (10).

2. The sealing plug for a bipolar battery according to claim 1, characterized in that: A sealing ring (12) is provided at the connection between the bottom end of the boss (6) and the outer end of the liquid injection hole (8).

3. The sealing plug for a bipolar battery according to claim 1, characterized in that: A fixing platform is provided at the top end of the telescopic sleeve (3).

4. The sealing plug for a bipolar battery according to claim 3, characterized in that: The bottom end of the spring (5) is arranged on the fixing platform, and the top end of the spring (5) is fixed to the lower end of the top of the valve cap (7).

5. The sealing plug for a bipolar battery according to claim 1, characterized in that: The telescopic shaft (4) and the valve cap (7) are of an integrated structure and are coaxially arranged with each other.

6. The sealing plug for a bipolar battery according to claim 1, characterized in that: The plug (1) is in the shape of a truncated cone or a column.

7. The sealing plug for a bipolar battery according to claim 1 or 2, characterized in that: The area of ​​the bottom end of the boss (6) is larger than the area of ​​the top end.

8. An explosion-proof valve structure for a bipolar battery, characterized in that: A sealing plug according to any one of claims 1 to 7 is used to seal the injection hole (8) on the sealing frame; the sealing plug is pressed and fixed through the mounting hole (14) of the pressing plate (13), and the pressing plate (13) is connected to the bipolar battery housing.

9. The explosion-proof valve structure for a bipolar battery according to claim 8, characterized in that: The inner diameter of the mounting hole (14) is adapted to the boss (6).

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