CN112259843A - Battery cover and battery - Google Patents

Battery cover and battery Download PDF

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Publication number
CN112259843A
CN112259843A CN202011120301.XA CN202011120301A CN112259843A CN 112259843 A CN112259843 A CN 112259843A CN 202011120301 A CN202011120301 A CN 202011120301A CN 112259843 A CN112259843 A CN 112259843A
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CN
China
Prior art keywords
hole
battery
exhaust
electrolyte
storage battery
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Pending
Application number
CN202011120301.XA
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Chinese (zh)
Inventor
周胜文
查立平
裴燕蕾
杨占欣
李梦楠
王志博
贾为宾
杜明亮
任天赐
张博生
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Fengfan Co Ltd
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Fengfan Co Ltd
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Filing date
Publication date
Application filed by Fengfan Co Ltd filed Critical Fengfan Co Ltd
Priority to CN202011120301.XA priority Critical patent/CN112259843A/en
Publication of CN112259843A publication Critical patent/CN112259843A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/06Lead-acid accumulators
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Abstract

The invention provides a storage battery cover and a storage battery, which belong to the technical field of storage batteries and comprise a main cover body and an exhaust cover arranged on the main cover body, wherein the main cover body and the exhaust cover are enclosed to form an enclosed space, labyrinth channels are arranged in the enclosed space, a liquid outlet hole is arranged on the main cover body, an exhaust hole is also arranged on the exhaust cover, a balance hole is also arranged on the main cover body, the liquid outlet hole and the exhaust hole are respectively positioned at two end parts of the labyrinth channels, and the balance hole is positioned in the area between a reflux hole and the exhaust hole. According to the storage battery cover provided by the invention, the balance hole is moved to one side of the backflow hole, which is far away from the edge of the closed space, so that the distance from the backflow hole to the other side of the closed space can be increased in a limited space, and thus, when the storage battery is inclined or vibrated, the position of the backflow hole is higher. Therefore, the electrolyte can overflow from the return hole only when the inclination angle of the storage battery is larger, so that the electrolyte is more difficult to flow out from the return hole, and the use safety of the storage battery is improved.

Description

Battery cover and battery
Technical Field
The invention belongs to the technical field of storage batteries, and particularly relates to a storage battery cover and a storage battery.
Background
The lead-acid storage battery is mainly structurally characterized in that a positive plate, a negative plate, a partition plate, electrolyte and a pole post are placed in a container consisting of a storage battery groove, a storage battery cover and an exhaust cover. The lead-acid storage battery comprises the following components:
Figure BDA0002731783180000011
Figure BDA0002731783180000012
the principle of the reversible reaction and the repeated charging and discharging works, electric energy is input and stored as chemical energy, and the chemical energy is released and converted into electric energy to be output. When the storage battery works, water in the electrolyte is decomposed to generate gases such as hydrogen and oxygen, and an exhaust hole needs to be formed in the battery cover body. Meanwhile, in order to prevent the problem that electrolyte is discharged from the exhaust hole in the using process, a labyrinth backflow structure and an electrolyte outlet are designed inside the storage battery cover, so that the path for discharging the electrolyte can be prolonged, and the electrolyte can flow back to the inside of the battery from the outlet in time. However, most of the existing storage batteries have the problem that when the storage batteries vibrate or incline, electrolyte easily overflows from a return hole, and the use safety of the storage batteries is seriously influenced.
Disclosure of Invention
The invention aims to provide a storage battery cover, which aims to solve the problem that electrolyte easily overflows from a return hole when a storage battery vibrates or inclines in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a storage battery cover for the opening part with battery case is sealed, establish including main lid and lid the exhaust lid on the main lid, main lid with the exhaust lid encloses and establishes into airtight space, be provided with the labyrinth passageway that is used for gas to spill over or the electrolyte backward flow in the storage battery in the airtight space all, be provided with on the main lid and be used for the intercommunication labyrinth passageway and the inside backward flow hole of battery, still be provided with on the exhaust lid and be used for the intercommunication labyrinth passageway and the outside exhaust hole of battery, still be provided with on the main lid and be used for balancing the balanced hole of airtight space and the inside atmospheric pressure of battery, backward flow hole with the exhaust hole is located respectively the both ends of labyrinth passageway, balanced hole site backward flow hole with region between the exhaust hole.
As another embodiment of this application, main lid with still be provided with between the exhaust lid and be used for the partition unit for a plurality of independent spaces with airtight space separation, still be provided with the intercommunication passageway that is used for independent space intercommunication on the partition unit, independent space quantity and battery cell body quantity phase-match.
As another embodiment of the present application, the number of the backflow holes in each of the partition units is two, and distances between the two backflow holes and the edge of the sealed space are equal.
As another embodiment of this application, the side that the exhaust hole is close to the backward flow hole still is provided with and is used for blockking electrolyte and with the liquid baffle that hinders that the exhaust hole interval set up.
As another embodiment of this application, the shape of hindering liquid baffle is the arc, hinder the opening direction of liquid retaining ring all towards keep away from the direction setting of backward flow hole.
As another embodiment of this application, the week of backward flow hole still is provided with the first inclined plane that is used for the electrolyte backward flow, the backward flow hole is located the minimum of first inclined plane.
As another embodiment of the application, the periphery of the balance hole is further provided with a liquid blocking groove for blocking the overflow of the electrolyte, and the balance hole is located at the bottom of the liquid blocking groove.
As another embodiment of this application, exhaust hole department all is provided with and is used for the filterable air filter of electrolyte steam in the gas, still be provided with mounting groove on the exhaust cover.
The beneficial effects of the accumulator cover provided by the invention are as follows: compared with the prior art, be equipped with main lid through the oral area lid at battery case, and be equipped with the exhaust lid at main lid upper cover, main lid encloses with the exhaust lid and establishes into airtight space, be provided with the maze passageway that is used for gas to spill over or electrolyte backward flow in the battery in the airtight space all, and be provided with the backward flow hole that is used for communicateing maze passageway and battery inside on the main lid, still be provided with the exhaust hole that is used for communicateing maze passageway and battery outside on the exhaust lid, still be provided with the balanced hole that is used for balanced airtight space and the inside atmospheric pressure of battery on the main lid, backward flow hole and exhaust hole are located the both ends of maze passageway respectively, balanced hole is located the region between backward flow hole and the exhaust. According to the battery cover, the balance hole is moved to one side of the backflow hole, which is far away from the edge of the closed space, so that the distance from the backflow hole to the other side of the closed space can be increased in a limited space, and the position of the backflow hole is higher when the battery is inclined or vibrated. Therefore, the electrolyte can overflow from the return hole only when the inclination angle of the storage battery is larger, so that the electrolyte is more difficult to flow out from the return hole, and the use safety of the storage battery is improved.
The invention also provides a storage battery, which comprises a battery shell and any one of the storage battery covers, wherein the storage battery cover is arranged at the opening part of the battery shell.
The storage battery provided by the invention has the beneficial effects that: compared with the prior art, be equipped with main lid through the oral area lid at battery case, and be equipped with the exhaust lid at main lid upper cover, main lid encloses with the exhaust lid and establishes into airtight space, be provided with the maze passageway that is used for gas to spill over or electrolyte backward flow in the battery in the airtight space all, and be provided with the backward flow hole that is used for communicateing maze passageway and battery inside on the main lid, still be provided with the exhaust hole that is used for communicateing maze passageway and battery outside on the exhaust lid, still be provided with the balanced hole that is used for balanced airtight space and the inside atmospheric pressure of battery on the main lid, backward flow hole and exhaust hole are located the both ends of maze passageway respectively, balanced hole is located the region between backward flow hole and the exhaust. According to the storage battery, the balancing hole is moved to one side of the backflow hole, which is far away from the edge of the closed space, so that the distance from the backflow hole to the other side of the closed space can be increased in a limited space, and the position of the backflow hole is higher when the storage battery is inclined or vibrated. Therefore, the electrolyte can overflow from the return hole only when the inclination angle of the storage battery is larger, so that the electrolyte is more difficult to flow out from the return hole, and the use safety of the storage battery is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a battery cover according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a main cover used in the embodiment of the present invention;
fig. 3 is a schematic structural view of an exhaust cover according to an embodiment of the present invention.
In the figure: 1. a main cover body; 11. a first inclined surface; 12. a second inclined surface; 2. an exhaust cover; 3. a labyrinth passage; 4. a return orifice; 5. an exhaust hole; 6. a balance hole; 7. a partition unit; 8. liquid blocking baffle.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and 2 together, the battery cover according to the present invention will now be described. The battery cover, an opening part for with battery case is sealed, establish exhaust lid 2 on main lid 1 including main lid 1 and lid, main lid 1 encloses with exhaust lid 2 and establishes into airtight space, be provided with the labyrinth passageway 3 that is used for gas to spill over or the electrolyte backward flow in the battery in the airtight space all, be provided with on the main lid 1 and be used for communicateing labyrinth passageway 3 and the inside backward flow hole 4 of battery, still be provided with on the exhaust lid 2 and be used for communicateing labyrinth passageway 3 and the outside exhaust hole 5 of battery, still be provided with the balancing hole 6 that is used for balanced airtight space and the inside atmospheric pressure of battery on the main lid 1, backward flow hole 4 and exhaust hole 5 are located the both ends of labyrinth passageway 3 respectively, balancing hole 6 is located the region between backward flow hole 4 and the exhaust hole 5.
Compared with the prior art, the storage battery cover provided by the embodiment is characterized in that a main cover body 1 is arranged at the opening of a battery shell, an exhaust cover 2 is arranged on the main cover body 1 in a covering mode, a closed space is defined by the main cover body 1 and the exhaust cover 2, labyrinth channels 3 used for gas overflow or electrolyte backflow in the storage battery are arranged in the closed space, backflow holes 4 used for communicating the labyrinth channels 3 with the interior of the storage battery are formed in the main cover body 1, exhaust holes 5 used for communicating the labyrinth channels 3 with the exterior of the storage battery are further formed in the exhaust cover 2, balance holes 6 used for balancing the pressure in the closed space and the pressure in the interior of the storage battery are further formed in the main cover body 1, the backflow holes 4 and the exhaust holes 5 are respectively located at two end portions of the labyrinth channels 3, and the balance holes 6 are located in a region. According to the battery cover, the balance hole 6 is moved to one side of the backflow hole 4 far away from the edge of the closed space, so that the distance from the backflow hole 4 to the other side of the closed space can be increased in a limited space, and the position of the backflow hole 4 is higher when the battery inclines or vibrates. Just so need the battery angle of inclination when bigger just can spill over electrolyte from backward flow hole 4 to make electrolyte more difficult to flow out from backward flow hole 4, can avoid electrolyte to spill over when the battery inclines, increase the security that the battery used.
As a specific embodiment of the battery cover provided by the present invention, please refer to fig. 3, a separation unit 7 for separating the enclosed space into a plurality of independent spaces is further disposed between the main cover body 1 and the exhaust cover 2, the separation unit 7 is further provided with a communication channel for communicating the independent spaces, the number of the independent spaces is matched with the number of the battery slots, a labyrinth channel 3 is disposed in each independent space, and a backflow hole 4 and a balance hole 6 are correspondingly disposed in each independent space. The sealed space is divided into a plurality of independent spaces by the dividing unit 7, the number of the independent spaces is matched with that of the storage battery grooves, the storage battery grooves are holding grooves which are arranged on the battery shell and used for holding the polar groups, and the independent spaces are respectively in one-to-one correspondence with the storage battery grooves. All be provided with maze passageway 3 in every independent space, all correspond in every independent space and be provided with backward flow hole 4, balance hole 6 and exhaust hole 5, can make every battery cell body independently exhaust and backward flow, other parts of battery can also continue to use after a cell body goes wrong.
In this embodiment, the partition unit 7 is also a part of the labyrinth passage 3, and the enclosed space is usually partitioned by a side wall of the labyrinth passage 3, so that the enclosed space forms a plurality of independent spaces corresponding to the tank body. The intercommunication passageway is two with setting up and the different circular arc of opening direction keeps off sour wall and constitutes, and two circular arcs keep off sour wall and separate the setting each other, can make things convenient for gas to circulate in a plurality of partition units, and the setting of intercommunication passageway has prolonged battery maze length when guaranteeing exhaust effect, avoids battery unit check string liquid.
Referring to fig. 1 to 3, as an embodiment of the battery cover according to the present invention, the number of the backflow holes 4 in each partition unit 7 is two, and the distances between the backflow holes 4 and the edge of the enclosed space are equal. The number of the backflow holes 4 is two, so that the communication area between the separation unit 7 and the interior of the storage battery is increased, gas generated in the storage battery is easier to remove when the storage battery is used, and the backflow of electrolyte condensed or overflowed in the separation unit 7 is more convenient. The distances between the two backflow holes 4 and the edge of the closed space are equal, so that the overflow heights of the electrolyte at the two backflow holes 4 are kept equal.
Referring to fig. 1 to 3, as an embodiment of the battery cover according to the present invention, a liquid blocking baffle 8 for blocking the electrolyte and spaced from the air vent 5 is further disposed on a side surface of the air vent 5 close to the backflow hole 4. The liquid blocking baffle 8 is arranged to block electrolyte overflowing from the backflow hole 4 into the labyrinth passage 3 when the storage battery is inclined, so that the liquid level of the electrolyte can be soaked with the air filter at the air outlet when the electrolyte level exceeds the liquid blocking baffle 8, the difficulty of soaking the air filter is improved, and the exhaust of the exhaust hole 5 is more convenient. Set up the semicircle arc simultaneously and hinder the liquid baffle, the reinforcing hinders sour effect, and the aforesaid hinders the liquid baffle simultaneously and cuts apart electrolyte return passage, makes things convenient for the steam atomization condensation among the exhaust gas.
Referring to fig. 1 to 3, the liquid blocking baffle 8 is arc-shaped, and the opening direction of the liquid blocking baffle faces away from the backflow hole 4. The shape that hinders liquid baffle 8 is the arc to arc baffle's opening direction all sets up towards the direction of keeping away from backward flow hole 4, make hinder liquid baffle 8 can with exhaust hole 5's shape adaptation more when blockking electrolyte, reduced and hindered the shared space of liquid baffle 8, make the liquid level of electrolyte must improve and just can soak the air filter piece of exhaust port department when surpassing hindering liquid baffle 8, it is more convenient to have improved the degree of difficulty that the air filter piece soaks and make exhaust hole 5 exhaust. And also facilitates the injection molding of the exhaust cover 2 and the main cover body 1.
Referring to fig. 1 to 3, as an embodiment of the battery cover according to the present invention, a first inclined surface 11 for returning the electrolyte is further provided around the return hole 4, and the return hole 4 is located at the lowest position of the first inclined surface 11. The arrangement of the first inclined surface 11 can make the electrolyte more convenient when flowing back, and can prevent the electrolyte from accumulating in the return hole 4, so that the use of the storage battery is influenced by the reduction of the electrolyte of the battery shell, and the arrangement of the first inclined surface 11 can also play a role in reinforcing the main cover body 1.
Referring to fig. 3, as a specific embodiment of the battery cover according to the present invention, a liquid blocking column for blocking the electrolyte is further disposed on the exhaust cover 2, the position of the liquid blocking column is matched with the position of the backflow hole 4, one end of the liquid blocking column is disposed inside the exhaust cover 2, the other end of the liquid blocking column is inserted into the backflow hole 4, and the periphery of the liquid blocking column and the side wall of the backflow hole 4 are disposed at an interval. The setting of shelves liquid post can make the gas that the battery during operation produced can be smooth get rid of from 4 departments of backward flow holes, also can play certain effect that stops simultaneously, prevents that battery slope occasionally electrolyte is direct to splash and go out from liquid outlet department, makes the use of battery safe and reliable more.
As a specific embodiment of the battery cover according to the present invention, please refer to fig. 2, a liquid blocking groove for blocking the overflow of the electrolyte is further disposed on a periphery of the balancing hole 6, and the balancing hole 6 is located at a bottom of the liquid blocking groove. The arrangement of the liquid blocking groove can prevent electrolysis from overflowing to the inside of the labyrinth passage 3 from the balance hole 6, and the internal and external pressure of the storage battery caused by the backflow of electrolyte at the same time at the balance hole 6 and the backflow hole 4 is not stable.
As a specific embodiment of the battery cover according to the present invention, please refer to fig. 2, the bottom of the liquid blocking groove is further provided with a second inclined surface 12 for electrolyte to flow back, and the balancing hole 6 is located at the lowest position of the second inclined surface 12. The arrangement of the second inclined surface 12 enables the electrolyte flowing into the liquid blocking groove from the balance hole 6 to quickly flow back to the inside of the storage battery, and meanwhile, the arrangement of the second inclined surface 12 can also enhance the strength of the main cover body 1.
Referring to fig. 3, as a specific embodiment of the battery cover according to the present invention, air filter sheets for filtering electrolyte vapor in air are disposed at the air exhaust holes 5, and a mounting groove is further disposed on the air exhaust cover 2. The setting of gas filter can filter gas when with gas outgoing in the battery, prevents that electrolyte steam from outside along with gas outgoing to the battery, causes the reduction of the interior electrolyte solution volume of battery, influences the safety in utilization of battery. And the arrangement of the mounting groove enables the mounting and fixing of the air filter piece to be firmer.
As an embodiment of the battery cover according to the present invention, please refer to fig. 3,
the present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a storage battery cover, its characterized in that is established including main lid and lid exhaust cover on the main lid, main lid with exhaust cover encloses and establishes into airtight space, airtight space all is provided with the labyrinth passageway that is used for gas to spill over or electrolyte backward flow in the storage battery, be provided with on the main lid and be used for the intercommunication labyrinth passageway and the inside backward flow hole of battery, exhaust cover is last still to be provided with and to be used for the intercommunication labyrinth passageway and the outside exhaust hole of battery, still be provided with on the main lid and be used for balancing the balanced hole of airtight space and the inside atmospheric pressure of battery, backward flow hole with the exhaust hole is located respectively the both ends of labyrinth passageway, balanced hole site backward flow hole with the region between the exhaust hole.
2. The battery cover according to claim 1, wherein a partition unit for partitioning the sealed space into a plurality of independent spaces is further provided between the main cover body and the discharge cover, and the partition unit is further provided with a communication passage for communicating the independent spaces.
3. The battery cover according to claim 2, wherein the number of said return holes in each of said partition units is two, and the distance between said return holes and the edge of the closed space is equal.
4. The battery cover according to claim 3, wherein said air vent is further provided with a liquid blocking baffle for blocking the electrolyte at a position spaced apart from said air vent on a side of said air vent adjacent to said return hole.
5. The battery cover according to claim 4, wherein the liquid blocking baffle is arc-shaped, and the opening direction of the liquid blocking baffle is arranged away from the backflow hole.
6. The battery cover according to claim 1, wherein the periphery of the return hole is further provided with a first inclined surface for returning the electrolyte, and the return hole is located at the lowest of the first inclined surface.
7. The battery cover according to claim 6, wherein the periphery of the balancing hole is further provided with a liquid blocking groove for blocking the overflow of the electrolyte, and the balancing hole is positioned at the bottom of the liquid blocking groove.
8. The cap as claimed in claim 7, wherein the bottom of the liquid-blocking groove is further provided with a second inclined surface for backflow of the electrolyte, and the balancing hole is located at the lowest of the second inclined surface.
9. The battery cover according to claim 1, wherein the air discharge holes are each provided with an air filter for filtering electrolyte vapor in the gas, and the air discharge cover is further provided with a mounting groove.
10. A battery comprising a battery housing, characterized in that: further comprising a battery cover according to any of claims 1 to 9, the battery cover being provided at a mouth of the battery case.
CN202011120301.XA 2020-10-19 2020-10-19 Battery cover and battery Pending CN112259843A (en)

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CN202011120301.XA CN112259843A (en) 2020-10-19 2020-10-19 Battery cover and battery

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114069119A (en) * 2021-11-05 2022-02-18 深圳市力胜源电子科技有限公司 Power battery pack with electrolyte supply device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2456318Y (en) * 2000-12-16 2001-10-24 保定金风帆蓄电池有限公司 Non-maintained accumulator cover
CN202948989U (en) * 2012-08-14 2013-05-22 骆驼集团华中蓄电池有限公司 Lead-acid battery cap with large backflow space exhaust structure
CN203103446U (en) * 2012-12-27 2013-07-31 肇庆理士电源技术有限公司 Lead-acid storage battery and battery cover thereof
CN206878049U (en) * 2017-06-09 2018-01-12 骆驼集团襄阳蓄电池有限公司 A kind of rich solution starts lead-acid battery lid
CN110611073A (en) * 2019-09-12 2019-12-24 安徽理士电源技术有限公司 Lead-acid storage battery with exhaust backflow structure
CN210576039U (en) * 2019-09-06 2020-05-19 风帆有限责任公司 Storage battery cover and storage battery

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2456318Y (en) * 2000-12-16 2001-10-24 保定金风帆蓄电池有限公司 Non-maintained accumulator cover
CN202948989U (en) * 2012-08-14 2013-05-22 骆驼集团华中蓄电池有限公司 Lead-acid battery cap with large backflow space exhaust structure
CN203103446U (en) * 2012-12-27 2013-07-31 肇庆理士电源技术有限公司 Lead-acid storage battery and battery cover thereof
CN206878049U (en) * 2017-06-09 2018-01-12 骆驼集团襄阳蓄电池有限公司 A kind of rich solution starts lead-acid battery lid
CN210576039U (en) * 2019-09-06 2020-05-19 风帆有限责任公司 Storage battery cover and storage battery
CN110611073A (en) * 2019-09-12 2019-12-24 安徽理士电源技术有限公司 Lead-acid storage battery with exhaust backflow structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114069119A (en) * 2021-11-05 2022-02-18 深圳市力胜源电子科技有限公司 Power battery pack with electrolyte supply device
CN114069119B (en) * 2021-11-05 2022-07-22 深圳市力胜源电子科技有限公司 Power battery pack with electrolyte supply device

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