Storage battery with double-exhaust structure

Abstract

The utility model discloses a storage battery with a double-exhaust structure, and relates to the technical field of storage batteries. The storage battery with the double-exhaust structure comprises a battery body and an exhaust cover, wherein the exhaust structure is arranged in the exhaust cover; the exhaust structure comprises a first exhaust structure and a second exhaust structure; the first exhaust structure comprises a first exhaust channel and a first waterproof breathable sheet, the first exhaust channel is formed in the exhaust cover, an air inlet end of the first exhaust channel is communicated with an inner cavity of the battery body, and an air outlet end is communicated with external atmosphere; the first waterproof breathable sheet is mounted at the air outlet end of the first exhaust channel; the second exhaust structure comprises a liquid adding channel and a pressure release valve, the liquid adding channel is formed in the exhaust cover, the liquid adding end of the liquid adding channel is communicated with external atmosphere, the liquid outlet end is communicated with the inner cavity of the battery body, and the pressure release valve is mounted at the liquid adding end of the liquid adding channel. According to the utility model, the first exhaust structure and the second exhaust structure are matched for exhausting, so that double insurance is realized, and the swelling risk in operation after colloid is added into the electrolyte of the storage battery is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of storage battery technology, specifically to a storage battery with a dual exhaust structure. Background Technology

[0002] Flooded parking batteries often operate under deep-cycle discharge conditions. This low-voltage charging and deep-discharge mode can lead to insufficient charging and severe electrolyte stratification, causing premature capacity loss or failure. To suppress stratification in flooded parking batteries, many manufacturers add silica gel to the electrolyte to increase discharge capacity and improve parking time and lifespan. Heavy trucks often travel on rough roads, experiencing bumps and jolting, or during high-current charging, electrolyte may overflow onto the vent cap and wet the air filter. Silica gel adhering to the filter can easily clog the battery vent, preventing gases generated during charging from escaping smoothly. This can cause excessive internal pressure and battery swelling, and if the vent is blocked, there is a significant risk of explosion.

[0003] Therefore, how to reduce the risk of swelling of glued, flooded parking batteries is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the present invention aims to provide a battery with a dual exhaust structure to at least partially solve the problem in the prior art where the exhaust holes on the outer cover are easily blocked, causing the battery to swell and posing a safety hazard.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A battery with a dual exhaust structure includes a battery body and an exhaust cover. The top of the battery body is open, and the exhaust cover is disposed on the open and connected to the battery body. An exhaust structure is provided inside the exhaust cover. The exhaust structure includes a first exhaust structure and a second exhaust structure arranged at intervals.

[0007] The first exhaust structure includes a first exhaust channel and a first waterproof and breathable sheet. The first exhaust channel is opened inside the exhaust cover and its air inlet is connected to the inner cavity of the battery body, and its air outlet is connected to the outside atmosphere. The first waterproof and breathable sheet is installed at the air outlet of the first exhaust channel.

[0008] The second venting structure includes a liquid filling channel and a pressure relief valve. The liquid filling channel is located inside the venting cover and its filling end is connected to the outside atmosphere, while its outlet end is connected to the internal cavity of the battery body. The pressure relief valve is installed at the filling end of the liquid filling channel.

[0009] The beneficial effects achieved by this invention are as follows: During the use of the battery, the gas generated inside the battery is discharged through the first venting structure, and the pressure relief valve acts as a sealant to block the electrolyte filling channel, preventing the internal electrolyte from flowing out. When the colloid in the electrolyte blocks the first waterproof and breathable sheet, and the first venting structure cannot vent normally, the pressure relief valve vents the gas to regulate the internal pressure of the battery. This invention utilizes the cooperation of the first and second venting structures for venting, achieving double protection and greatly reducing the risk of swelling during operation after the addition of colloid to the battery electrolyte.

[0010] Furthermore, the exhaust structure also includes a second exhaust channel disposed within the exhaust cover, the two ends of the second exhaust channel being connected to the air inlet of the first exhaust channel and the liquid outlet of the liquid filling channel, respectively.

[0011] Furthermore, there are multiple exhaust structures, and the second exhaust channels of the multiple exhaust structures are provided with interconnected vent holes.

[0012] Furthermore, multiple liquid filling channels are provided, each of which is connected to the second exhaust channel, and each liquid filling end of the liquid filling channel is equipped with the pressure relief valve.

[0013] Furthermore, multiple labyrinthine reflux channels are provided. Each of the liquid addition channels has a labyrinthine reflux channel on its outer periphery. The inlet end of each labyrinthine reflux channel is connected to the second exhaust channel, and the reflux end is connected to the outlet end of the liquid addition channel.

[0014] Furthermore, the height of the inner bottom wall of the labyrinthine return channel gradually decreases from its inlet end to its return end.

[0015] Furthermore, the pressure relief valve includes a valve body, a connecting ring, a valve sleeve, a valve cover, and a valve cover limiting cover. The valve body is installed on the inner wall of the liquid filling channel near its liquid filling end, and it has an installation hole communicating with the liquid filling channel. The connecting ring is fixed on the inner wall of the installation hole away from the liquid filling end of the liquid filling channel.

[0016] The valve sleeve is coaxially arranged with the mounting hole and one end is connected to the inner ring side of the connecting ring, and the other end is provided with a first vent hole; the valve cover is a sealing sliding cover disposed at the other end along the axial direction of the valve sleeve to block or open the first vent hole; the valve cover limiting cover is fixed on the inner wall of the mounting hole on the side of the valve cover near the liquid filling end of the liquid filling channel and has a gap H between it and the valve cover, and the valve cover limiting cover is provided with a plurality of second vent holes.

[0017] Furthermore, the leak-proof component includes a second waterproof and breathable sheet and a second waterproof and breathable sheet cap. The second waterproof and breathable sheet is installed on the side of the valve cover limiting cover near the liquid filling end of the liquid filling channel. The second waterproof and breathable sheet cap is pressed onto the side of the second waterproof and breathable sheet near the liquid filling end of the liquid filling channel and has multiple third vent holes.

[0018] Furthermore, the pressure relief valve also includes a dustproof component, which includes positioning pins and a dustproof cover. The valve body has multiple positioning holes evenly spaced circumferentially on the outer periphery of the mounting hole at the end near the liquid filling channel. The multiple positioning pins correspond one-to-one with the multiple positioning holes, and one end of each pin is positioned and connected in the positioning hole. The dustproof cover is fixed to the other end of the multiple positioning pins and has a vent gap H between it and the valve body to allow the third vent to communicate with the outside.

[0019] Furthermore, the pressure relief valve also includes a baffle plate. One end of the baffle plate is fixed to the inner wall of the mounting hole on the side of the valve sleeve away from the liquid filling end of the liquid filling channel, and the other end is inclined in the direction away from the liquid filling end of the liquid filling channel and has an upper air channel that runs through the axial direction of the mounting hole.

[0020] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a battery with a dual exhaust structure, which has the following beneficial effects:

[0021] 1. This utility model utilizes the first waterproof and breathable sheet and the first exhaust channel to form a first exhaust structure, and the pressure relief valve and the liquid filling channel to form a second exhaust structure, achieving double protection and greatly reducing the risk of swelling during operation after the addition of gel to the battery electrolyte.

[0022] 2. The liquid filling channel and the first exhaust channel of this utility model are connected through the second exhaust channel, and each of the liquid filling channels is connected to the second exhaust channel. This allows the gas in the liquid filling channel to communicate with the gas in the first exhaust channel. Furthermore, the second exhaust channels of the multiple exhaust structures are provided with vent holes, so that if any first waterproof venting sheet or any pressure relief valve fails to vent, it can still vent through other first waterproof venting sheets or pressure relief valves, ensuring that the battery can vent and preventing the battery from swelling.

[0023] 3. The pressure relief valve can be adjusted according to the internal pressure of the battery, and can be used for both sealing and venting.

[0024] 4. The pressure relief valve is equipped with a dustproof component to prevent dust from clogging the second waterproof and breathable sheet, and a baffle plate to prevent electrolyte from flowing upwards. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is a front view schematic diagram of a battery with a dual exhaust structure provided by this utility model.

[0027] Figure 2 This is a top view schematic diagram of a storage battery with a dual exhaust structure provided by this utility model.

[0028] Figure 3 This is a top view of the inner cover provided by this utility model.

[0029] Figure 4 This is a bottom view of the outer cover provided by this utility model.

[0030] Figure 5 for Figure 1 Enlarged structural diagram of section A.

[0031] Figure 6 for Figure 1 Enlarged structural diagram of section B.

[0032] Figure 7 A cross-sectional structural diagram of the pressure relief valve provided by this utility model.

[0033] Figure 8 This is a schematic diagram of the liquid addition channel structure provided by this utility model.

[0034] Figure 9 for Figure 3 Enlarged structural diagram of section C.

[0035] In the diagram: 1. Battery body; 2. Exhaust cover; 21. Inner cover; 22. Outer cover; 3. First exhaust structure; 31. First exhaust channel; 311. Inlet section; 312. Outlet section; 32. First waterproof vent; 4. Second exhaust structure; 41. Liquid filling channel; 42. Pressure relief valve; 421. Valve body; 4211. Mounting hole; 422. Connecting ring; 423. Valve sleeve; 4231. First vent; 424. Valve cover; 425. Valve cover limit cover; 426. Leakage prevention assembly; 4261. Second waterproof vent; 4262. Second waterproof vent cover; 427. Dustproof assembly; 4271. Positioning pin; 4272. Dustproof cover; 428. Liquid baffle; 4281. Air inlet channel; 43. Sealing ring; 5. Second exhaust channel; 6. Vent hole; 7. Labyrinth-type return channel. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] Please see Figures 1-9 This utility model discloses a battery with a dual exhaust structure, including a battery body 1 and an exhaust cover 2. The top of the battery body 1 is open, and the exhaust cover 2 is placed on the open and connected to the battery body 1, and an exhaust structure is provided inside it; the exhaust structure includes a first exhaust structure 3 and a second exhaust structure 4 arranged at intervals.

[0040] The first exhaust structure 3 includes a first exhaust channel 31 and a first waterproof and breathable sheet 32, such as Figure 5 As shown, the first exhaust channel 31 includes an air inlet section 311 arranged perpendicular to the cover surface of the exhaust cover 2 and an air outlet section 312 arranged parallel to the cover surface of the exhaust cover 2. One end of the air inlet section 311 is connected to the inner cavity of the battery body, and one end of the air outlet section 312 is connected to the air inlet section 311 and the other end is connected to the external atmosphere. The direction of the arrow in the figure is its gas flow direction; the first waterproof breathable sheet 32 ​​is installed at the air inlet end of the air outlet section 312.

[0041] The second exhaust structure 4 includes a liquid filling channel 41 and a pressure relief valve 42. The liquid filling channel 41 is opened inside the exhaust cover 2 along the direction perpendicular to the cover surface of the exhaust cover 1, and its liquid filling end is connected to the outside atmosphere, while its liquid outlet end is connected to the inner cavity of the battery body 1. The pressure relief valve 42 is installed at the liquid filling end of the liquid filling channel 41.

[0042] During the use of this utility model battery, the gas generated inside is discharged through the venting channel and the first waterproof venting sheet 32. When the colloid in the electrolyte blocks the first waterproof venting sheet 32, the internal pressure increases. Then, the pressure is released through the pressure relief valve 42 to regulate the internal pressure of the battery. This utility model uses the first waterproof venting sheet 32 ​​and the first venting channel 31 to form a first venting structure, and uses the pressure relief valve 42 and the electrolyte filling channel 41 to form a second venting structure, achieving double protection and greatly reducing the risk of swelling during operation after the addition of colloid to the battery electrolyte.

[0043] See Figures 3-4 The exhaust structure also includes a second exhaust channel 5 disposed within the exhaust cover 2. The two ends of the second exhaust channel 5 are respectively connected to the air inlet of the first exhaust channel 31 and the liquid outlet of the liquid filling channel 41. The liquid filling channel 41 is connected to the first exhaust channel 31, allowing the gas in the liquid filling channel 41 to communicate with the gas in the first exhaust channel 31, thereby enhancing the exhaust effect.

[0044] Depending on the size of the battery, multiple exhaust structures can be provided, and vent holes 6 are provided between the second exhaust channels 5 of the multiple exhaust structures. When the first waterproof vent 32 of any exhaust structure is blocked, the internal gas can flow through the vent holes 6 to other exhaust structures to continue exhausting.

[0045] Depending on the size of the battery, multiple filling channels 41 can be provided. Each filling channel 41 is connected to the second exhaust channel 5, and each filling end of the filling channel 41 is equipped with a pressure relief valve 42.

[0046] See Figure 3 , Figure 4 and Figure 9 The battery also features multiple labyrinthine return channels 7, each corresponding to a different electrolyte filling channel 41. Each labyrinthine return channel 7 is located on the outer periphery of the electrolyte filling channel 41, with its inlet end connected to the second venting channel 5 and its return end connected to the outlet end of the corresponding electrolyte filling channel 41 to prevent electrolyte from overflowing. Water generated by the battery or splashed electrolyte flows back into the battery body 1 through the labyrinthine return channels 7.

[0047] The height of the inner bottom wall of the labyrinth-type reflux channel 7 gradually decreases from its inlet end to its return end, so that the water or electrolyte flowing into the labyrinth-type reflux channel 7 can flow smoothly back into the battery body 1.

[0048] like Figures 6-7 As shown, the pressure relief valve 42 includes a valve body 421, a connecting ring 422, a valve sleeve 423, a valve cover 424, and a valve cover limiting cover 425. The valve body 421 is installed at the liquid filling end of the liquid filling channel 41, and it has an installation hole 4211 communicating with the liquid filling channel 41. The installation hole is a stepped hole, including a first hole, a second hole, and a third hole whose diameters increase sequentially towards the liquid filling end of the liquid filling channel 41. The connecting ring 422 is fixed on the inner wall of the first hole.

[0049] The valve sleeve 423 is coaxially connected to the mounting hole 4211 on the inner ring side of the connecting ring 422. The upper side wall of the valve sleeve 423 has a first vent hole 4231. The valve cover 424 is a sealing sliding cover located at the other end of the valve sleeve 423 along the axial direction of the valve sleeve 423 to block or open the first vent hole 4231. The valve cover limiting cover 425 is fixed in the second hole and has a gap H1 between it and the valve cover 424. The valve cover limiting cover 425 has multiple second vent holes.

[0050] When the first waterproof and breathable sheet 32 ​​is blocked, and the internal pressure of the battery body 1 increases, the gas pushes the valve cover 424 to slide along the sliding sleeve until the first vent 4231 can communicate with the mounting hole 4211. The gas flows from the first vent 4231 into the mounting hole 4211 and is discharged through the second vent on the valve cover 424. In a specific embodiment, the first vent 4231 is a square hole with a diameter of 1-2mm × 1-2mm. When the internal gas pressure of the battery body 1 decreases, the external gas pushes the valve cover 424 to slide and seal the first vent 4231, achieving a seal and preventing the internal electrolyte from flowing out of the first vent 4231.

[0051] Specifically, the valve cover 424 and the valve sleeve 423 are interference-fitted. On the one hand, this allows the first vent 4231 to be slidably opened when the internal pressure of the battery is too high, thereby regulating the internal pressure of the battery and preventing it from bulging or cracking. On the other hand, it also serves a sealing function, closing the pressure relief valve 42 when the internal pressure of the battery is lower than its closing pressure, preventing internal acid mist from leaking out and also preventing external air from entering the battery. In one specific embodiment, the measured opening pressure of the pressure relief valve 42 is 10 kPa to 15 kPa, and the closing pressure is 3 kPa to 5 kPa.

[0052] The pressure relief valve 42 also includes a leak-proof component 426, which includes a second waterproof vent sheet 4261 and a second waterproof vent sheet cap 4262. The second waterproof vent sheet 4261 is installed on the side of the valve cover limiting cap 425 near the liquid filling end of the liquid filling channel 41, serving to provide ventilation and waterproofing, preventing the electrolyte carried in the gas from flowing out. The second waterproof vent sheet cap 4262 is installed in the third hole and is interference-fitted with the third hole to limit the second waterproof vent sheet 4261 and prevent the second waterproof vent sheet 4261 from moving upward. The second waterproof vent sheet cap 4262 has multiple third vent holes to facilitate gas discharge.

[0053] The first waterproof and breathable sheet 32 ​​and the second waterproof and breathable sheet 4261 are made of polytetrafluoroethylene and sodium chloride, mixed, pressed, and baked at a certain temperature. They serve to prevent water leakage and venting, and are porous and breathable but hydrophobic. During the use of the battery, they prevent the internal electrolyte from overflowing and the external liquid from seeping in, and their breathability helps to maintain the stability of the internal pressure of the battery.

[0054] The pressure relief valve 42 also includes a dustproof component 427, which includes positioning pins 4271 and a dustproof cover 4272. Multiple positioning holes are evenly spaced circumferentially around the top of the valve body 421 corresponding to the mounting holes 4211. Each positioning pin 4271 corresponds to one of the positioning holes, with one end fixedly connected within the positioning hole. The dustproof cover 4272 has a conical structure, fixed to the other end of the positioning pins 4271, and has a vent gap H2 between it and the valve body 421 to allow the third vent to communicate with the outside. The top surface of the second waterproof vent cover 4262 is flush with or lower than the top surface of the valve body 421. The dustproof component 427 can block dust, preventing dust from clogging the second waterproof vent cover 4261. The positioning holes can be used not only for positioning and insertion with the positioning pins 4271, but also for tightening and loosening tooling insertion holes when the valve body 421 is installed at the liquid filling end of the liquid filling channel 41.

[0055] The pressure relief valve 42 also includes a baffle plate 428. One end of the baffle plate 428 is fixed to the inner wall of the mounting hole 4211 on the side of the valve sleeve 423 away from the liquid filling end of the liquid filling channel 41. The other end is inclined away from the liquid filling end of the liquid filling channel 41 and has an upper air passage 4281 that runs through the axial direction of the mounting hole 4211. During battery shaking, the electrolyte that flows out collides with the baffle plate 428 and flows downward back into the battery cavity, preventing the electrolyte from impacting the valve cover 424 and causing the valve cover 424 to slide open, thereby preventing the electrolyte from contacting the second waterproof vent 4261 and causing the second waterproof vent 4261 to become blocked.

[0056] A sealing ring 43 is provided at the connection between the valve body 421 and the liquid filling channel 41. Specifically, the liquid filling channel 41 is a stepped hole with a decreasing diameter towards its outlet end. The lower part of the valve body 421 is threaded to the small-diameter section of the stepped hole, and the upper part is connected to the large-diameter section of the stepped hole. The sealing ring 43 is located at the connection between the valve body 421 and the shoulder of the stepped hole. The sealing ring 43 is a sealing rubber ring, which is integrally formed with the valve body 421 during injection molding.

[0057] See Figure 8 A raised ring 411 is formed on the shoulder of the stepped hole. The cross-section of the raised ring 411 is triangular, and the width of the triangular structure gradually decreases towards the liquid filling end. The sealing ring 43 is pressed and sealed with the raised ring 411. Preferably, the width of the triangular structure is 0.5mm-1.0mm and the height is 0.3mm-0.5mm.

[0058] See Figure 1 The vent cover 2 includes an inner cover 21 and an outer cover 22. The inner cover 21 is placed over the top opening of the battery body 1, and the outer cover 22 is placed over the inner cover 21 and fixed to the top wall of the battery body 1 with bolts. The edges where the inner cover 21 and the outer cover 22 connect are heat-sealed to improve the bonding strength and enhance the sealing effect. The inner cover 21 and the outer cover 22 interlock to form a first venting channel 31, a second venting channel 5, a vent hole 6, a labyrinthine return channel 7, and a liquid filling channel 41.

[0059] The working principle of this utility model:

[0060] During battery operation, when the first waterproof vent 32 of the first venting structure 3 is functioning normally, the pressure relief valve 42 is sealed, and the gas generated inside the battery is discharged outward through the first venting channel 31. While the first waterproof vent 32 allows air to pass through, it also blocks the electrolyte, preventing it from flowing out. Simultaneously, the gas generated inside can also flow from the filling channel 41 through the second venting channel 5 back to the first venting channel 31 and be discharged. When the first waterproof vent 32 is blocked, the second venting structure 4 vents, and all the gas generated inside the battery flows into the filling channel 41 and is discharged through the pressure relief valve 42.

[0061] When the pressure relief valve 42 is sealed, the internal pressure of the battery is less than the external pressure. The valve cover 424 slides downward and is pressurized against the valve sleeve 423 to achieve a sealed connection. The first vent 4231 cannot communicate with the mounting hole 4211, and the electrolyte cannot be discharged through the pressure relief valve 42. When the pressure relief valve 42 is venting, the internal pressure of the battery is greater than the external pressure. The internal gas pushes up the valve cover 424, and the first vent 4231 communicates with the mounting hole 4211. The gas can be discharged outward through the first vent 4231, while the electrolyte is blocked by the baffle plate 428 and the second waterproof and breathable sheet 4261 and cannot be discharged outward through the pressure relief valve 42.

[0062] When electrolyte is added through the electrolyte filling channel 41 of this invention, the electrolyte flows downward from its filling end to its outlet end, and then flows into the battery body 1. When venting, the gas inside the battery body 1 flows upward from its outlet end to the pressure relief valve, and is discharged through the pressure relief valve 42. By installing the pressure relief valve 42, both the electrolyte filling channel 41 can be sealed and vented, enhancing its functionality and reducing costs.

[0063] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0064] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A storage battery having a double exhaust structure, comprising a battery body (1) and an exhaust cover (2), the battery body (1) being open at the top, the exhaust cover (2) being provided at the opening and fixed to the battery body (1), and an exhaust structure being provided inside the exhaust cover (2), characterized in that, The exhaust structure comprises a first exhaust structure (3) and a second exhaust structure (4) arranged at intervals; The first exhaust structure (3) comprises a first exhaust passage (31) and a first waterproof air-permeable sheet (32), the first exhaust passage (31) is arranged inside the exhaust cover (2) and has an air inlet end communicated with the inner cavity of the battery body (1) and an air outlet end communicated with the external atmosphere; the first waterproof air-permeable sheet (32) is installed at the air outlet end of the first exhaust passage (31); The second exhaust structure (4) comprises a liquid feeding passage (41) and a pressure relief valve (42), the liquid feeding passage (41) is arranged inside the exhaust cover (2) and has a liquid feeding end communicated with the external atmosphere and a liquid outlet end communicated with the inner cavity of the battery body (1), the pressure relief valve (42) is installed at the liquid feeding end of the liquid feeding passage (41).

2. The battery having a double exhaust structure according to claim 1, wherein The exhaust structure further comprises a second exhaust passage (5) arranged in the exhaust cover (2), both ends of the second exhaust passage (5) are respectively communicated with the air inlet end of the first exhaust passage (31) and the liquid outlet end of the liquid feeding passage (41).

3. The battery having a double exhaust structure according to claim 2, wherein The exhaust structure is multiple, and the second exhaust passages (5) of the multiple exhaust structures are provided with air holes (6) communicated with each other.

4. The battery having a double exhaust structure according to claim 2, wherein The liquid feeding passage (41) is provided with multiple, each of the liquid feeding passages (41) is communicated with the second exhaust passage (5), and the liquid feeding end of each of the liquid feeding passages (41) is installed with the pressure relief valve (42).

5. The battery having a double exhaust structure according to claim 4, wherein A plurality of labyrinthine backflow passages (7) are further provided, the plurality of labyrinthine backflow passages (7) correspond to the plurality of liquid feeding passages (41) one by one, each of the labyrinthine backflow passages (7) is arranged at the outer circumferential side of the liquid feeding passage (41), the inflow end of each of the labyrinthine backflow passages (7) is communicated with the second exhaust passage (5), and the backflow end is respectively communicated with the liquid outlet end of the corresponding liquid feeding passage (41) to prevent the electrolyte from overflowing from the liquid feeding passage (41).

6. The battery having a double exhaust structure according to claim 5, wherein The inner bottom wall height of the labyrinthine backflow passage (7) gradually decreases from the inflow end to the backflow end.

7. The battery having a double exhaust structure according to any one of claims 1 to 6, characterized by The pressure relief valve (42) comprises a valve body (421), a connecting ring (422), a valve sleeve (423), a valve cover (424) and a valve cover limiting cover (425), the valve body (421) is installed on the inner wall of the liquid feeding passage (41) close to the liquid feeding end, and has an installation hole (4211) communicated with the liquid feeding passage (41); the connecting ring (422) is fixed on the inner wall of the installation hole (4211) away from the liquid feeding end of the liquid feeding passage (41); The valve sleeve (423) is coaxially arranged with the mounting hole (4211) and connected at one end to the inner ring side of the connecting ring (422), and the other end is provided with a first gas outlet hole (4231); the valve cover (424) is sealingly and slidably covered at the other end of the valve sleeve (423) in the axial direction of the valve sleeve (423) to block or open the first gas outlet hole (4231); the valve cover limiting cover (425) is fixed on the inner wall of the mounting hole (4211) on the side of the valve cover (424) close to the liquid adding end of the liquid adding channel (41) and has a gap H1 between the valve cover (424), and a plurality of second gas outlet holes are formed in the valve cover limiting cover (425).

8. The battery having a double exhaust structure according to claim 7, wherein The pressure relief valve (42) further comprises a liquid leakage prevention assembly (426), the liquid leakage prevention assembly (426) comprises a second waterproof air permeable sheet (4261) and a second waterproof air permeable sheet gland (4262), the second waterproof air permeable sheet (4261) is installed on the side of the valve cover limiting cover (425) close to the liquid adding end of the liquid adding channel (41), and the second waterproof air permeable sheet gland (4262) is pressed on the side of the second waterproof air permeable sheet (4261) close to the liquid adding end of the liquid adding channel (41), and a plurality of third gas outlet holes are formed in the second waterproof air permeable sheet gland (4262).

9. The battery having a double exhaust structure according to claim 8, wherein The pressure relief valve (42) further comprises a dust prevention assembly (427), the dust prevention assembly (427) comprises a positioning pin (4271) and a dust cover (4272), and a plurality of positioning holes are uniformly and circumferentially spaced apart on the outer peripheral side of the mounting hole (4211) corresponding to the end of the valve body (421) close to the liquid adding end of the liquid adding channel (41), a plurality of positioning pins (4271) are one-to-one corresponding to a plurality of positioning holes and are positioned and connected at one end in the positioning holes; the dust cover (4272) is fixed at the other end of the plurality of positioning pins (4271) and has an air permeable gap H2 between the valve body (421) to communicate the third gas outlet hole with the outside.

10. The battery having a double exhaust structure according to claim 9, wherein The pressure relief valve (42) further comprises a liquid blocking plate (428), the liquid blocking plate (428) is fixed at one end on the inner wall of the mounting hole (4211) corresponding to the side of the valve sleeve (423) away from the liquid adding end of the liquid adding channel (41), and the other end is inclined away from the liquid adding end of the liquid adding channel (41) and is provided with an upper gas passage (4281) penetrating in the axial direction of the mounting hole (4211).

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