CN113381100A - Battery plastic shell and water permeability detection method thereof - Google Patents
Battery plastic shell and water permeability detection method thereof Download PDFInfo
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- CN113381100A CN113381100A CN202110552074.6A CN202110552074A CN113381100A CN 113381100 A CN113381100 A CN 113381100A CN 202110552074 A CN202110552074 A CN 202110552074A CN 113381100 A CN113381100 A CN 113381100A
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- 239000004033 plastic Substances 0.000 title claims abstract description 147
- 229920003023 plastic Polymers 0.000 title claims abstract description 147
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 230000035699 permeability Effects 0.000 title claims abstract description 45
- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 239000002253 acid Substances 0.000 claims abstract description 47
- 238000002347 injection Methods 0.000 claims abstract description 38
- 239000007924 injection Substances 0.000 claims abstract description 38
- 238000007789 sealing Methods 0.000 claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims description 23
- 239000003822 epoxy resin Substances 0.000 claims description 19
- 229920000647 polyepoxide Polymers 0.000 claims description 19
- 238000005303 weighing Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 239000008213 purified water Substances 0.000 claims description 2
- 238000003860 storage Methods 0.000 description 11
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000011041 water permeability test Methods 0.000 description 2
- -1 ABS2 Proteins 0.000 description 1
- 101100272412 Arabidopsis thaliana BIA1 gene Proteins 0.000 description 1
- 101100388296 Arabidopsis thaliana DTX51 gene Proteins 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/112—Monobloc comprising multiple compartments
- H01M50/114—Monobloc comprising multiple compartments specially adapted for lead-acid cells
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/121—Organic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/147—Lids or covers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
- H01M50/627—Filling ports
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a battery plastic shell and a detection method of water permeability thereof, wherein the battery plastic shell comprises a main shell, a plurality of baffle plates are arranged on the main shell, the baffle plates surround the shell to form a plurality of accommodating cavities, through holes are formed in the baffle plates, the through holes are used for communicating two adjacent accommodating cavities, and the accommodating cavities are used for accommodating detection liquid; the main shell is provided with a cover plate, the cover plate is provided with a plurality of acid injection valve holes at intervals, the acid injection valve holes are matched with the accommodating cavity and used for injecting detection liquid into the accommodating cavity; at least one acid injection valve hole is connected with an air duct, and other acid injection valve holes are arranged in a sealing manner; the air duct is used for connecting the air pump, and a sealing piece is arranged on the air duct. According to the invention, after the battery plastic shells made of different materials are selected, the through holes are punched, the vent bodies are ventilated and the battery plastic shells are sealed, the battery plastic shells are weighed at preset temperature and for different preset time lengths, the water permeability of the battery plastic shells is detected by obtaining the weight difference of the battery plastic shells, and the operation is convenient.
Description
Technical Field
The invention relates to the technical field of plastic shell detection, in particular to a battery plastic shell and a method for detecting the water permeability of the battery plastic shell.
Background
The invention of the lead-acid storage battery has the history of more than 150 years, and is widely applied due to the advantages of good reliability, high cost performance, recyclability and the like. The lead-acid storage battery plastic shell part mainly comprises a storage battery groove, a cover and a cover plate which are made of PP or ABS plastic materials, the storage battery groove and the storage battery cover are sealed together by glue to form a sealed battery inner cavity which is used as a container device for electrochemical reaction of the storage battery and bears the whole pole group and a container of electrolyte, and a partition plate in the pole group is an elastic superfine glass fiber partition plate, so that the whole pole group has certain assembling pressure on the storage battery groove, and the plastic shell has certain mechanical strength.
At present, test items of a plastic shell of a lead-acid storage battery mainly comprise voltage resistance, impact resistance, heat resistance, corrosion resistance, air pressure resistance and the like, the items have detailed detection methods in GB/T23754-. In order to solve the above problems, it is necessary to find a method for accurately measuring the water permeability of the battery plastic casing to guide the improvement and optimization of the plastic casing.
Disclosure of Invention
The invention aims to provide a battery plastic shell and a water permeability detection method thereof, which can directly and truly reflect the water permeability of the lead acid storage battery plastic shell and are convenient to operate.
In order to achieve the purpose, the invention adopts the following technical means:
a battery plastic shell comprises a main shell, wherein a plurality of baffle plates are arranged on the main shell, the baffle plates surround the shell to form a plurality of accommodating cavities, through holes are formed in the baffle plates, the through holes are used for communicating two adjacent accommodating cavities, and detection liquid is placed in the accommodating cavities; the main shell is provided with a cover plate, the cover plate is provided with a plurality of acid injection valve holes at intervals, the acid injection valve holes are matched with the accommodating cavity, and the acid injection valve holes are used for injecting detection liquid into the accommodating cavity; at least one acid injection valve hole is connected with an air duct, and other acid injection valve holes are arranged in a sealing manner; the air duct is used for connecting the air pump, is equipped with the sealing member on the air duct.
In one embodiment, the seal is formed by sealing the airway tube with epoxy.
In one embodiment, the liquid level of the detection liquid is not higher than the height of the through hole.
A method for detecting the water permeability of a battery plastic shell comprises the following steps:
selecting a plurality of battery plastic shells with different material structures;
after a through hole is drilled on a baffle plate in the battery plastic shell, the battery plastic shell is sealed by epoxy resin;
injecting the detection liquid into each accommodating cavity through acid injection valve holes formed in the cover plate, connecting at least one acid injection valve hole with an air guide pipe, and sealing other acid injection valve holes;
introducing external air into the battery plastic shell through the air guide tube, and sealing the air guide tube until the air pressure in the battery plastic shell reaches a preset air pressure;
acquiring the initial weight of the battery plastic shell after the air guide pipe is subjected to sealing treatment;
placing the battery plastic shell with the sealed air guide pipe at a preset temperature for a preset time, and weighing the battery plastic shell to obtain the final weight of the battery plastic shell;
and obtaining the difference of the water permeability of different battery plastic shells by comparing the difference between the final weight and the initial weight of the battery plastic shells after the sealing treatment of different air guide pipes.
In one embodiment, the acid valve hole is sealed by coating epoxy resin.
In one embodiment, the airway tube is sealed with epoxy.
In one embodiment, the detection liquid is purified water.
In one embodiment, the height of the detection liquid level in the accommodating cavity of the battery plastic shell is lower than the height of the through hole.
In one embodiment, the step of introducing the external air into the battery plastic housing through the air duct until the air pressure in the battery plastic housing reaches a preset air pressure, and then sealing the air duct includes the following specific operation processes:
starting the air pump to ventilate the air duct;
the gas supplied by the air pump enters each accommodating cavity in the battery plastic shell through the gas guide pipe, the acid injection valve hole and the through hole;
monitoring the air pressure in the battery plastic shell;
when the gas pressure in the main shell is kept for a preset time under the preset gas pressure, the gas guide tube is clamped by the clamping device;
and sealing the air guide pipe subjected to clamping treatment, and removing the clamping device.
In one embodiment, the preset air pressure is 30-40 kPa, and the preset time is 20-40 s.
Compared with the prior art, the invention has the following technical effects:
according to the battery plastic shell and the detection method of the water permeability of the battery plastic shell, the battery plastic shells made of different materials are selected, the through holes are punched, the vent body is sealed, the battery plastic shells are weighed at the preset temperature and at different preset time lengths, the water permeability of the corresponding battery plastic shells is detected by obtaining the weight difference of the battery plastic shells, the operation is convenient, and the water permeability of the lead-acid storage battery plastic shells in actual use is truly reflected.
In addition, the method for detecting the water permeability of the battery plastic shell can verify the differences of the water permeability of the plastic shells under different materials, different pressures, different temperatures and different preset times, so that the multidimensional judgment is carried out on the battery plastic shells made of different materials, the test is reliable, the high-quality battery plastic shell is selected finally, the cost is reduced, and the service life of the battery is prolonged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a battery plastic case provided by the invention;
fig. 2 shows a flow chart of a method for detecting water permeability of a battery plastic casing provided by the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The battery plastic shell comprises a main shell 100, wherein a plurality of baffle plates 110 are arranged on the main shell 100, the baffle plates 110 enclose the shell to form a plurality of accommodating cavities 120, through holes 111 are formed in the baffle plates 110, the through holes 111 are used for communicating two adjacent accommodating cavities 120, and the accommodating cavities 120 are used for accommodating detection liquid, wherein in the embodiment, the detection liquid is pure water.
The main housing 100 is provided with a cover plate 200, and the periphery of the cover plate 200 is hermetically connected with the main housing 100 through epoxy resin, so that the air tightness inside the main housing 100 is ensured; a plurality of acid injection valve holes 210 are arranged on the cover plate 200 at intervals, the acid injection valve holes 210 are arranged in a way of being matched with the accommodating cavity 120, and the acid injection valve holes 210 are used for injecting detection liquid into the accommodating cavity 120; at least one acid injection valve hole is connected with an air guide pipe, other acid injection valve holes are arranged in a sealing mode, the air guide pipe 300 is used for being connected with an air pump, and a sealing piece 310 is arranged on the air guide pipe 300; specifically, after the detection liquid is injected into the accommodating cavity 120 through the acid injection valve holes 210, at least one of the acid injection valve holes 210 is connected with the gas guide tube 300, and the other acid injection valve holes 210 are sealed by coating epoxy resin, and further, after the acid injection valve holes 210 are covered with the rubber caps, the peripheries of the rubber caps are sealed by epoxy resin; after the air pump injects the air into the main casing 100 through the air duct 300 via the acid injection valve hole 210, the air duct 300 is sealed by epoxy resin to form the sealing member 310, so as to ensure that the air pressure inside the main casing 100 is stably at the preset air pressure.
Specifically, after the air pump injects the air into the main housing 100 through the air duct 300 via the acid injection valve hole 210, the air duct 300 is sealed by epoxy resin to form the sealing member 310, and the specific operation process includes:
starting the air pump to ventilate the air duct 300;
the air supplied by the air pump enters each accommodating cavity 120 in the main shell 100 through the air duct 300, the acid filling valve hole 210 and the through hole 111;
monitoring the gas pressure inside the main housing 100;
when the gas pressure in the main housing 100 is kept at the preset pressure for a preset time, the gas guide tube 300 is clamped; in the embodiment, the water stop clamp is adopted to clamp the air duct 300, so that the problem that the air in the main shell 100 flows out through the air duct 300 to cause the reduction of the air pressure in the main shell 100 and the incapability of accurately measuring the water permeability of the battery plastic shell is avoided; the preset air pressure is 30-40 kPa, preferably 40kPa, and the preset time is 20-40 s, preferably 30 s.
The air duct 300 subjected to clamping treatment is sealed by epoxy resin, so that the problem that the water permeability of the battery plastic shell cannot be accurately measured due to the fact that air in the main shell 100 flows out through the air duct 300 and the air pressure in the main shell 100 is reduced is further avoided; wherein, the air inlet of the air duct 300 is sealed by epoxy resin, so as to ensure that the air pressure inside the main housing 100 is stably kept under a preset air pressure.
In one embodiment, the liquid level of the detection liquid is not higher than the height of the through hole 111, so as to prevent the air pressure environment in the non-communicated accommodating cavities 120 from being different due to the fact that the interiors of the accommodating cavities 120 in the main housing 100 are not communicated with each other and the air injected into the main housing 100 by the air pump is not dispersed into the accommodating cavities 120, and further the water permeability of the battery plastic housing cannot be accurately determined.
According to the plastic shell for the battery, the through hole 111 is formed in the partition baffle in the main shell 100, the detection liquid is placed in the accommodating cavity 120 in a matching manner, external air is introduced into the main shell 100 through the air guide pipe 300, and the air guide pipe 300 is sealed, so that the air pressure in the main shell 100 is under a preset air pressure, and the water permeability of the plastic shell for the battery is conveniently detected.
According to the battery plastic housing, the invention provides a method for detecting the water permeability of the battery plastic housing, and the main housing 100, the cover plate 200 and the air duct 300 involved in the method can have the same technical characteristics as those explained in the embodiment of the battery plastic housing, and can produce the same technical effects. According to the method for detecting the water permeability of the battery plastic shell, the through hole 111 is formed in the partition plate in the battery plastic shell, the detection liquid is placed in the accommodating cavity 120 in a matching mode, external air is introduced into the battery plastic shell through the air guide pipe 300, the air guide pipe 300 is sealed, the air pressure in the battery plastic shell is enabled to be under the preset air pressure, the battery plastic shell is placed in different environments, and therefore the water permeability of the battery plastic shell can be conveniently detected.
Fig. 2 is a schematic flow chart illustrating a method for detecting water permeability of a battery plastic casing according to the present invention, referring to fig. 2, the method for detecting water permeability of a battery plastic casing includes steps S110 to S170, which specifically include the following steps:
step S110, selecting a plurality of battery plastic cases with different material structures respectively; in this embodiment, 3 sets of ABS battery plastic cases and 3 sets of PP battery plastic cases are selected.
Step S120, selecting one of the battery plastic cases, punching a through hole 111 on a baffle plate in the battery plastic case, and sealing the battery plastic case by epoxy resin; specifically, after the cover plate 200 is separated from the main casing 100, the through hole 111 is formed by punching the baffle plate in the main casing 100 through the plastic casing punching machine, the cover plate 200 and the main casing 100 are sealed through epoxy resin, the air tightness of the battery plastic casing is improved, and the subsequent water permeability of the battery plastic casing is convenient to detect.
Step S130, injecting detection liquid into each accommodating cavity 120 through acid injection valve holes 210 arranged on the cover plate 200, connecting at least one acid injection valve hole 210 with the air guide pipe 300, and sealing other acid injection valve holes 210 by coating epoxy resin, specifically, after a rubber cap is buckled on the acid injection valve hole 210, sealing the periphery of the rubber cap by using epoxy resin; wherein, detect the liquid and be the pure water, the detection liquid equivalent that pours into each holding chamber 120 into, the detection liquid level height in the holding chamber 120 of the same battery moulded case is less than the height at through-hole 111 place.
Step S140, introducing external air into the battery plastic shell through the air duct 300, and sealing the air duct 300 until the air pressure in the battery plastic shell reaches a preset air pressure; specifically, the air guide tube 300 is sealed by epoxy resin.
Step S140, introducing external air into the battery plastic housing through the air duct 300, and sealing the air duct 300 until the air pressure in the battery plastic housing reaches a preset air pressure, wherein the specific operation process includes:
starting the air pump to ventilate the air duct 300;
the air supplied by the air pump enters each accommodating cavity 120 in the battery plastic shell through the air duct 300, the acid injection valve hole 210 and the through hole 111;
monitoring the air pressure in the battery plastic shell;
when the gas pressure in the main housing 100 is kept at the preset pressure for a preset time, the gas guide tube 300 is clamped by the clamping device; in the embodiment, the clamping device is a water stopping clamp, after the air guide tube 300 is clamped, the air connector of the air pump is removed from the air guide tube 300, so that the subsequent weighing operation of the battery plastic shell is facilitated, in addition, the water stopping clamp is adopted to clamp the air guide tube 300, and the problem that the air pressure in the battery plastic shell is reduced and the water permeability of the battery plastic shell cannot be accurately measured due to the fact that the air in the battery plastic shell flows out through the air guide tube 300 is avoided; the preset air pressure is 30-40 kPa, preferably 40kPa, and the preset time is 20-40 s, preferably 30 s; the battery plastic shell is further provided with a battery rubber cap, and the valve opening pressure of the battery rubber cap is generally 30-40 kPa, so that the preset pressure in the battery plastic shell is selected to be 40kPa for detection in the embodiment, and the accuracy of the detection of the water permeability of the battery plastic shell is improved;
sealing the air duct 300 subjected to clamping treatment, and removing the clamping device; specifically, the air inlet of the air guide pipe 300 which is clamped by the epoxy resin is sealed, so that the gas inside the battery plastic shell can not flow out through the air guide pipe 300, the air tightness of the battery plastic shell is improved, and the subsequent water permeability of the battery plastic shell is convenient to detect.
Step S150, obtaining the initial weight of the battery plastic shell after the air duct 300 is sealed; and weighing the sealed battery plastic shell of the air duct 300 by using an electronic scale with calibrated weights, wherein the mass of the battery plastic shell is recorded as m 0.
Step S160, after the battery plastic shell subjected to sealing treatment of the air duct 300 is placed for a preset time at a preset temperature, weighing the battery plastic shell to obtain the final weight m of the battery plastic shell; in this embodiment, the battery plastic casing after the air duct 300 is sealed is placed in an incubator with a preset temperature of 40 ℃ for a predetermined time, wherein the predetermined time may be set to 1 month, 2 months, and 3 months, and the final weights corresponding to the battery plastic casings are m1, m2, and m3, respectively.
Step S170, obtaining the difference of the water permeability of different battery plastic cases by comparing the difference between the final weight and the initial weight of the battery plastic cases after the sealing treatment of the different air ducts 300.
The battery plastic cases made of 3 sets of ABS materials and the battery plastic cases made of 3 sets of PP materials selected in the embodiment of the present invention are subjected to water permeability test, and are numbered as ABS1, ABS2, ABS3, PP1, PP2, and PP3, and then the weight of each battery plastic case is obtained under the environmental conditions of internal air pressure 40kPa and preset temperature of 40 ℃ for different predetermined time periods, and the obtained results are shown in table 1:
TABLE 1 Water Permeability test chart of plastic battery cases of 3 sets of ABS materials and 3 sets of PP materials in the examples
Table 1 shows that: the method for detecting the water permeability of the battery plastic shell can verify the differences of the water permeability of the plastic shell under different materials, different pressures, different temperatures and different preset times, further perform multi-dimensional judgment on the battery plastic shells made of different materials, test is reliable, finally select the high-quality battery plastic shell, reduce the cost and prolong the service life of the battery.
Compared with the prior art, the invention has the following technical effects:
according to the battery plastic shell and the detection method of the water permeability of the battery plastic shell, after the battery plastic shells made of different materials are selected, the through hole 111, the vent body and the sealing treatment are performed, the battery plastic shells are weighed at the preset temperature and at different preset time lengths, the water permeability of the corresponding battery plastic shells is detected by obtaining the weight difference value of the battery plastic shells, the operation is convenient, and the water permeability of the lead-acid storage battery plastic shells under actual use is truly reflected; in addition, the method for detecting the water permeability of the battery plastic shell can verify the differences of the water permeability of the plastic shells under different materials, different pressures, different temperatures and different preset times, so that the multidimensional judgment is carried out on the battery plastic shells made of different materials, the test is reliable, the high-quality battery plastic shell is selected finally, the cost is reduced, and the service life of the battery is prolonged.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A battery plastic shell is characterized in that: the detection device comprises a main shell, wherein a plurality of baffle plates are arranged on the main shell, the baffle plates surround the shell to form a plurality of containing cavities, through holes are formed in the baffle plates and used for communicating two adjacent containing cavities, and the containing cavities are used for containing detection liquid; the main shell is provided with a cover plate, the cover plate is provided with a plurality of acid injection valve holes at intervals, the acid injection valve holes are matched with the accommodating cavity, and the acid injection valve holes are used for injecting detection liquid into the accommodating cavity; at least one acid injection valve hole is connected with an air duct, and other acid injection valve holes are arranged in a sealing manner; the air duct is used for connecting the air pump, is equipped with the sealing member on the air duct.
2. The battery plastic case of claim 1, wherein: the sealing element is formed after the air guide pipe is sealed by epoxy resin.
3. The battery plastic case of claim 1, wherein: the liquid level height of the detection liquid is not higher than the height of the through hole.
4. A method for detecting the water permeability of a battery plastic shell is characterized by comprising the following steps:
selecting a plurality of battery plastic shells with different material structures;
after a through hole is drilled on a baffle plate in the battery plastic shell, the battery plastic shell is sealed by epoxy resin;
injecting the detection liquid into each accommodating cavity through acid injection valve holes formed in the cover plate, connecting at least one acid injection valve hole with an air guide pipe, and sealing other acid injection valve holes;
introducing external air into the battery plastic shell through the air guide tube, and sealing the air guide tube until the air pressure in the battery plastic shell reaches a preset air pressure;
acquiring the initial weight of the battery plastic shell after the air guide pipe is subjected to sealing treatment;
placing the battery plastic shell with the sealed air guide pipe at a preset temperature for a preset time, and weighing the battery plastic shell to obtain the final weight of the battery plastic shell;
and obtaining the difference of the water permeability of different battery plastic shells by comparing the difference between the final weight and the initial weight of the battery plastic shells after the sealing treatment of different air guide pipes.
5. The method for detecting the water permeability of the battery plastic shell as claimed in claim 4, wherein: the acid filling valve hole is sealed by coating epoxy resin.
6. The method for detecting the water permeability of the battery plastic shell as claimed in claim 4, wherein: and sealing the air duct by epoxy resin.
7. The method for detecting the water permeability of the battery plastic shell as claimed in claim 4, wherein: the detection liquid is purified water.
8. The method for detecting the water permeability of the battery plastic shell as claimed in claim 4, wherein: the height of the detection liquid level in the accommodating cavity of the battery plastic shell is lower than the height of the through hole.
9. The method for detecting the water permeability of the battery plastic shell according to claim 4, wherein the step of introducing external air into the battery plastic shell through the air guide tube until the air pressure in the battery plastic shell reaches a preset air pressure, and then sealing the air guide tube comprises the following specific operation processes:
starting the air pump to ventilate the air duct;
the gas supplied by the air pump enters each accommodating cavity in the battery plastic shell through the gas guide pipe, the acid injection valve hole and the through hole;
monitoring the air pressure in the battery plastic shell;
when the gas pressure in the main shell is kept for a preset time under the preset gas pressure, the gas guide tube is clamped by the clamping device;
and sealing the air guide pipe subjected to clamping treatment, and removing the clamping device.
10. The method for detecting the water permeability of the battery plastic shell according to claim 9, wherein: the preset air pressure is 30-40 kPa, and the preset time is 20-40 s.
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Application publication date: 20210910 |