CN111239117A - Method for detecting coating state of assembled steel shell circular lithium ion battery - Google Patents
Method for detecting coating state of assembled steel shell circular lithium ion battery Download PDFInfo
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- CN111239117A CN111239117A CN202010047796.1A CN202010047796A CN111239117A CN 111239117 A CN111239117 A CN 111239117A CN 202010047796 A CN202010047796 A CN 202010047796A CN 111239117 A CN111239117 A CN 111239117A
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- woven fabric
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- ion battery
- steel shell
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 30
- 238000000576 coating method Methods 0.000 title claims abstract description 30
- 239000010959 steel Substances 0.000 title claims abstract description 30
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 239000011248 coating agent Substances 0.000 title claims abstract description 29
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 117
- 239000010949 copper Substances 0.000 claims abstract description 33
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052802 copper Inorganic materials 0.000 claims abstract description 32
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims abstract description 30
- 229910000365 copper sulfate Inorganic materials 0.000 claims abstract description 26
- 238000009736 wetting Methods 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 238000003466 welding Methods 0.000 claims abstract description 11
- 238000007747 plating Methods 0.000 claims description 38
- 238000005096 rolling process Methods 0.000 claims description 8
- 239000003086 colorant Substances 0.000 claims description 4
- 229910000366 copper(II) sulfate Inorganic materials 0.000 claims description 4
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 13
- 238000001514 detection method Methods 0.000 abstract description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052742 iron Inorganic materials 0.000 abstract description 5
- 229910052759 nickel Inorganic materials 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 41
- 238000012360 testing method Methods 0.000 description 9
- 238000005253 cladding Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 3
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000010030 laminating Methods 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Plasma & Fusion (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a method for detecting the coating state of a steel shell circular lithium ion battery after assembly, and belongs to the technical field of lithium ion battery detection. A method for detecting the coating state of a steel shell round lithium ion battery after assembly comprises the steps of wetting non-woven fabrics by using a copper sulfate solution with the concentration of about 1%, attaching the non-woven fabrics soaked with the copper sulfate solution to a resistance welding spot position, a roll groove position and a sealing edge position for about 30 seconds, taking down the non-woven fabrics after 30 seconds, observing whether red copper metal is separated out on the non-woven fabrics, overcoming the difficulty that the coating state of the existing steel shell round lithium ion battery after assembly cannot be detected quickly, titrating the non-woven fabrics at the resistance welding position, the roll groove position and the sealing position which need to be tested mainly through the copper sulfate solution, determining the damage degree of a coating according to the amount of replaced copper metal, wherein the copper sulfate solution and a nickel layer do not react obviously, the copper sulfate solution and iron react quickly, whether the coating on the surface.
Description
Technical Field
The invention relates to the technical field of lithium ion battery detection, in particular to a method for detecting the plating state of a steel shell circular lithium ion battery after assembly.
Background
At present, a nickel-plated steel shell is mostly adopted for a steel shell circular lithium ion battery, the nickel-plated steel shell is a battery shell which is subjected to punch forming after nickel plating is carried out on the surface of a steel strip in advance, the nickel-plated steel shell is generally used for a shell of a battery cell of a power lithium battery, and a plating layer is arranged to ensure that the lithium ion battery steel shell is not corroded by electrolyte. After the nickel-plated layer is damaged, the battery can be rusted in the assembling process and the later-stage using process, the overall performance of the battery is reduced, and the processes of resistance welding, roll groove, sealing and the like in the assembling process can damage the nickel-plated steel shell coating to a certain extent.
At present, the plating state of the assembled battery is mainly evaluated by salt mist and high temperature and high humidity, but the salt mist and the high temperature and high humidity are long in consumed time, so that problems in the assembling process are not found and treated in time, and a rapid and convenient method for detecting the plating state is urgently needed.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a method for detecting the coating state of a steel shell circular lithium ion battery after assembly, which can overcome the difficulty that the coating state of the existing steel shell circular lithium ion battery after assembly cannot be detected quickly, can effectively and quickly test whether the coating on the surface of a steel shell is damaged, and is simple and convenient to operate.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A method for detecting the plating state of a steel shell circular lithium ion battery after assembly comprises the following steps:
step one, selecting a small piece of non-woven fabric, and wetting the non-woven fabric by preparing a copper sulfate solution with the concentration of 1% -2%;
step two, attaching the wetted non-woven fabric in the step one to the position of the point to be detected of the coating, and keeping the attachment state for 20-30 s;
taking down the non-woven fabric, and observing whether red copper metal is separated out on the non-woven fabric;
and step four, comparing the color development condition of the non-woven fabrics in the step three with the standard color development condition, and judging the damage condition of the plating layer.
Further, the point part to be detected comprises a resistance welding point part, a rolling groove part and a sealing edge part of the lithium ion battery, and when whether the coating is damaged or not and the damage degree are required to be detected, the lubricated non-woven fabric is used for respectively detecting the resistance welding point part, the rolling groove part and the sealing edge part.
Furthermore, in the second step, after the non-woven fabric is attached to one of the positions where the point is to be detected on one of the plating layers and before the position is attached to the next position where the point is to be detected on the next plating layer, the non-woven fabric is wetted once by the copper sulfate solution, so that after the non-woven fabric is detected at each position, the attachment detection is not accurate enough due to insufficient wettability.
Furthermore, when different plating layers are attached to the positions of the detection points to be detected, wetting points of the non-woven fabric are different, after the non-woven fabric is detected, when red copper is separated out on the non-woven fabric, the next position is detected, so that the wetting points on the non-woven fabric, which are different from the previous attachment part, are used for detecting the current battery position, and the previous detection result is not easy to interfere with the next detection result by the operation.
Further, the non-woven fabrics colour is other colours except red, and when cladding material on the battery suffered to destroy, the non-woven fabrics with wait to detect the position reaction after, can appear red copper on the non-woven fabrics, the non-woven fabrics colour is distinguished from red for it is more obvious when observing the testing result.
Furthermore, when red copper metal is separated out in the third step, the damage condition of the plating layer can be judged according to the separation amount of the copper metal, after the plating layer on the battery is damaged, the wetted non-woven fabric is attached to the part to be detected, the wetted non-woven fabric and the wetted non-woven fabric react to separate out red copper on the non-woven fabric, and the more the amount of the copper metal on the non-woven fabric is, the deeper the red color is, and the larger the damage condition of the plating layer is.
Further, under the condition that the coating is damaged, the reaction principle between the wetted non-woven fabric and the position of the coating to be detected at the point is Fe + CuSO4→FeSO4And when the wetted non-woven fabric is attached to the part to be detected, the wetting solution contains a copper sulfate solution, so that the copper sulfate solution reacts with iron to generate a ferric sulfate solution and a copper simple substance, and red copper can be separated out from the non-woven fabric.
Furthermore, a waterproof breathable layer is fixedly arranged on one surface of the non-woven fabric, and the surface of the non-woven fabric, which is far away from one side of the waterproof breathable layer, is a wetting binding surface, so that when the non-woven fabric is soaked in a copper sulfate solution, the non-woven fabric is soaked by the handheld waterproof breathable layer, and the solution on the non-woven fabric is not easy to permeate the waterproof breathable layer in the soaking process, so that hands of a user are wetted or the hands of the user are stained with the copper sulfate solution, and discomfort is caused.
Furthermore, the surface that non-woven fabrics one side was kept away from to waterproof ventilative layer sets firmly the semi-circular hand stretching strap of two symmetries, makes things convenient for the handheld person's hand to hold and carries out taking of waterproof ventilative layer and non-woven fabrics between two semi-circular hand stretching straps, makes things convenient for the infiltration operation of non-woven fabrics.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the scheme can overcome the difficulty that the plating state can not be rapidly detected after the assembly of the existing steel shell circular lithium ion battery, and can effectively and rapidly test whether the surface plating of the steel shell is damaged or not, so that the operation is simple and convenient.
(2) The point parts to be detected comprise resistance welding spot parts, rolling groove parts and sealing edge parts of the lithium ion battery, and when whether the coating is damaged or not and the damage degree are required to be detected, the lubricated non-woven fabric is used for respectively detecting the resistance welding spot parts, the rolling groove parts and the sealing edge parts.
(3) And in the second step, after the non-woven fabric is attached to one position of the point to be detected of one of the coating layers and before the non-woven fabric is attached to the position of the point to be detected of the next coating layer, the non-woven fabric is wetted once by the copper sulfate solution, so that after the non-woven fabric is detected at each position, the attachment detection is not accurate enough due to the insufficient wettability.
(4) When waiting to detect point position to different cladding materials and pasting, the wetting point of non-woven fabrics is all different, and when the non-woven fabrics detected the back, when having red copper to appear on the non-woven fabrics, carries out the detection at next position, makes the wetting point different with laminating portion the last time on the non-woven fabrics carry out the detection at present battery position, and this operation makes the difficult interference that causes the testing result of next time of being difficult for of testing result.
(5) The non-woven fabrics colour is other colours except red, and when cladding material on the battery suffered to destroy, the non-woven fabrics with wait to detect that after the position reaction, can appear red copper on the non-woven fabrics, the non-woven fabrics colour is distinguished from red for it is more obvious when observing the testing result.
(6) And in the third step, when red copper metal is separated out, the damage condition of the plating layer can be judged according to the separation amount of the copper metal, after the plating layer on the battery is damaged, the wetted non-woven fabric is attached to the part to be detected, the wetted non-woven fabric and the wetted non-woven fabric react to separate out the red copper on the non-woven fabric, and the more the amount of the copper metal on the non-woven fabric is, the darker the red color is, so that the damage condition of the plating layer is larger.
(7) Under the condition that the coating is damaged, the reaction principle between the wetted non-woven fabric and the position of the coating to be detected is Fe + CuSO4→FeSO4And when the wetted non-woven fabric is attached to the part to be detected, the wetting solution contains a copper sulfate solution, so that the copper sulfate solution reacts with iron to generate a ferric sulfate solution and a copper simple substance, and red copper can be separated out from the non-woven fabric.
(8) One surface of the non-woven fabric is fixedly provided with the waterproof breathable layer, and the surface of one side of the non-woven fabric, which is far away from the waterproof breathable layer, is a wetting binding surface, so that when the non-woven fabric is soaked in a copper sulfate solution, the non-woven fabric is soaked by holding the waterproof breathable layer by hand, and the solution on the non-woven fabric is not easy to permeate the waterproof breathable layer in the soaking process, so that hands of a user are wetted or the hands of the user are stained with the copper sulfate solution, and discomfort is.
(9) The surface that non-woven fabrics one side was kept away from on waterproof ventilative layer sets firmly the semi-circular hand stretching strap of two symmetries, makes things convenient for the handheld person's hand to hold and carries out taking of waterproof ventilative layer and non-woven fabrics between two semi-circular hand stretching straps, makes things convenient for the infiltration operation of non-woven fabrics.
Drawings
FIG. 1 is a flow chart of the detection method of the present invention;
FIG. 2 is a schematic diagram of the reaction between the wetted non-woven fabric and the damaged coating layer according to the present invention;
FIG. 3 is a schematic front view of the nonwoven fabric, the waterproof breathable layer and the semi-circular hand-pulling belt part in a holding state according to the present invention;
fig. 4 is a schematic bottom view of the waterproof breathable layer and the semicircular hand-pulling belt part in a flat state.
The reference numbers in the figures illustrate:
1 non-woven fabrics, 2 waterproof breathable layers and 3 semicircular hand pull straps.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-4, a method for detecting a plating state of a steel-shell circular lithium ion battery after assembly includes the following steps:
step one, selecting a small piece of non-woven fabric 1, and wetting the non-woven fabric 1 by preparing a copper sulfate solution with the concentration of 1%;
step two, attaching the wetted non-woven fabric 1 in the step one to a position of a point to be detected of the coating, and keeping the attachment state for 30 s;
step three, taking down the non-woven fabric 1, and observing whether red copper metal is separated out on the non-woven fabric 1;
and step four, comparing the color development condition of the non-woven fabric 1 in the step three with the standard color development condition, and judging the damage condition of the plating layer.
The point parts to be detected comprise resistance welding spot parts, rolling groove parts and sealing edge parts of the lithium ion battery, and when whether the coating is damaged or not and the damage degree are required to be detected, the lubricated non-woven fabric 1 is used for detecting the resistance welding spot parts, the rolling groove parts and the sealing edge parts respectively.
In the second step, the non-woven fabric 1 is wetted once by the copper sulfate solution after being attached to one of the positions of the plating layer where the point is to be detected and before being attached to the position of the next plating layer where the point is to be detected, so that the non-woven fabric 1 is not easy to be attached and detected inaccurately due to insufficient wettability after being detected at each position.
When waiting to detect point position to different cladding materials and pasting, the wetting point of non-woven fabrics 1 is all different, after non-woven fabrics 1 detects, when having red copper to appear on non-woven fabrics 1, carries out the detection at next position, makes the wetting point different with the laminating portion of the previous time on non-woven fabrics 1 carry out the detection at present battery position, and this operation makes the difficult interference that causes the testing result of the previous time to the testing result of next time that leads to the fact.
The color of the non-woven fabric 1 is other colors except red, preferably white, when a plating layer on the battery is damaged, red copper can be separated out from the non-woven fabric 1 after the non-woven fabric 1 reacts with a part to be detected, and the color of the non-woven fabric 1 is different from red, so that the detection result can be observed more obviously.
When red copper metal is separated out in the third step, the damage condition of the plating layer can be judged according to the separation amount of the copper metal, after the plating layer on the battery is damaged, the wetted non-woven fabric 1 is attached to the part to be detected, the wetted non-woven fabric 1 and the wetted non-woven fabric react to separate out red copper on the non-woven fabric 1, and the more the amount of the copper metal on the non-woven fabric 1 is, the deeper the red color is, so that the damage condition of the plating layer is larger.
Under the condition that the coating is damaged, the reaction principle between the wetted non-woven fabric 1 and the position of the coating to be detected is Fe + CuSO4→FeSO4And when the wetted non-woven fabric 1 is attached to the part to be detected, the wetting solution contains a copper sulfate solution, so that the copper sulfate solution reacts with iron to generate a ferric sulfate solution and a copper simple substance, and red copper is separated out from the non-woven fabric 1.
One surface of the non-woven fabric 1 is fixedly provided with the waterproof breathable layer 2, and the surface of the non-woven fabric 1, which is far away from the side of the waterproof breathable layer 2, is a wetting binding surface, so that when the non-woven fabric 1 is soaked in a copper sulfate solution, the non-woven fabric 1 is soaked by the handheld waterproof breathable layer 2, and the solution on the non-woven fabric 1 is not easy to permeate the waterproof breathable layer 2 in the soaking process, so that hands of a user are wetted or the hands are stained with the copper sulfate solution, and discomfort is caused.
The surface that waterproof ventilative layer 2 kept away from 1 one side of non-woven fabrics sets firmly the semi-circular hand stretching strap 3 of two symmetries, makes things convenient for handheld person's hand to hold and carries out taking of waterproof ventilative layer 2 and non-woven fabrics 1 between two semi-circular hand stretching straps 3, makes things convenient for the infiltration operation of non-woven fabrics 1.
The method can overcome the difficulty that the coating state of the conventional steel shell circular lithium ion battery cannot be quickly detected after assembly, mainly determines the damage degree of the coating according to the amount of replaced copper metal by titrating copper sulfate solution at the positions of resistance welding, rolling groove and sealing which need to be tested, has unobvious reaction between the copper sulfate solution and a nickel layer, is quick in reaction with iron, can effectively and quickly test whether the coating on the surface of the steel shell is damaged, and is simple and convenient to operate.
The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.
Claims (9)
1. A method for detecting the plating state of a steel shell circular lithium ion battery after assembly is characterized by comprising the following steps: the method comprises the following steps:
step one, selecting a small piece of non-woven fabric (1), and wetting the non-woven fabric (1) by preparing a copper sulfate solution with the concentration of 1% -2%;
step two, attaching the wetted non-woven fabric (1) in the step one to the position of the point to be detected of the coating, and keeping the attachment state for 20-30 s;
taking down the non-woven fabric (1), and observing whether red copper metal is separated out on the non-woven fabric (1);
and step four, comparing the color development condition of the non-woven fabric (1) in the step three with the standard color development condition, and judging the damage condition of the plating layer.
2. The method for detecting the plating state of the assembled steel shell circular lithium ion battery according to claim 1, characterized in that: the point parts to be detected comprise resistance welding spot parts, rolling groove parts and sealing edge parts of the lithium ion battery.
3. The method for detecting the plating state of the assembled steel shell circular lithium ion battery according to claim 1, characterized in that: and in the second step, the non-woven fabric (1) is wetted once by a copper sulfate solution after being attached to the point to be detected of one of the coatings and before being attached to the point to be detected of the next coating.
4. The method for detecting the plating state of the assembled steel shell circular lithium ion battery according to claim 1, characterized in that: when different positions of the point to be detected of the plating layer are bonded, the wetting points of the non-woven fabric (1) are different.
5. The method for detecting the plating state of the assembled steel shell circular lithium ion battery according to claim 1, characterized in that: the color of the non-woven fabric (1) is other colors except red.
6. The method for detecting the plating state of the assembled steel shell circular lithium ion battery according to claim 1, characterized in that: and when red copper metal is separated out in the third step, judging the damage condition of the plating layer according to the separation amount of the copper metal.
7. The method for detecting the plating state of the assembled steel shell circular lithium ion battery according to claim 1, characterized in that: under the condition that the coating is damaged, the reaction principle between the wetted non-woven fabric (1) and the position of a point to be detected of the coating is Fe + CuSO4→FeSO4+Cu。
8. The method for detecting the plating state of the assembled steel shell circular lithium ion battery according to claim 1, characterized in that: one surface of the non-woven fabric (1) is fixedly provided with a waterproof breathable layer (2), and the surface of one side, away from the waterproof breathable layer (2), of the non-woven fabric (1) is a wetting binding surface.
9. The method for detecting the plating state of the assembled steel shell circular lithium ion battery of claim 8, wherein the method comprises the following steps: the surface of one side of the waterproof breathable layer (2) far away from the non-woven fabric (1) is fixedly provided with two symmetrical semicircular hand pull belts (3).
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| 何长林等: "《中国人民共和国国家标准 GB5935-86》", 11 March 1986, 中华人民共和国国家标准 * |
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