CN117913428A - Manufacturing method of battery shell with explosion-proof nick, battery shell and secondary battery - Google Patents
Manufacturing method of battery shell with explosion-proof nick, battery shell and secondary battery Download PDFInfo
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- CN117913428A CN117913428A CN202410090193.8A CN202410090193A CN117913428A CN 117913428 A CN117913428 A CN 117913428A CN 202410090193 A CN202410090193 A CN 202410090193A CN 117913428 A CN117913428 A CN 117913428A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 238000004880 explosion Methods 0.000 claims abstract description 36
- 238000005530 etching Methods 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims description 9
- 239000010935 stainless steel Substances 0.000 claims description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
- 238000010329 laser etching Methods 0.000 description 15
- 238000005422 blasting Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- 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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention relates to a manufacturing method of a battery shell with explosion-proof scores, a battery shell and a secondary battery, wherein the manufacturing method comprises the following steps: taking a shell; etching on the outer surface and/or the inner surface of the shell to form a plurality of first scores which are distributed at intervals; and respectively etching between every two adjacent first scratches to form a second scratch, and connecting the first scratches into a whole through each second scratch so as to form an explosion-proof scratch, wherein the scratch residual value of the second scratch is smaller than that of the first scratch. According to the invention, the explosion-proof nicks are formed by etching the first nicks and the second nicks on the shell, and the tearing difficulty of each area of the explosion-proof nicks can be adjusted through the second nicks, so that the tearing difficulty of each area of the explosion-proof nicks is relatively close, and the situation that the area except the explosion-proof nicks of the shell is torn to form a larger opening and the situation that the explosion is insufficient during explosion is avoided.
Description
Technical Field
The invention belongs to the technical field of secondary batteries, and relates to a manufacturing method of a battery shell with explosion-proof nicks, a battery shell and a secondary battery.
Background
At present, new energy automobiles and electric automobiles become a new development trend of the automobile industry; the secondary battery is also widely applied to the field of new energy sources as a power source of equipment such as pure electric vehicles, plug-in hybrid electric vehicles, electric bicycles and the like. The current secondary battery starts to adopt a lithium battery packaged by a thinner stainless steel shell so as to save material cost and reduce occupied space of the battery, and an explosion-proof notch formed by laser etching on the stainless steel shell is used as an integrated explosion-proof valve to replace an explosion-proof valve welded on the shell; therefore, the manufacturing process of the explosion-proof structure is simplified, the explosion-proof structure and the shell are integrated, and the explosion-proof effect of the explosion-proof structure is prevented from being influenced by poor welding effect.
In addition, in order to avoid secondary damage to peripheral devices caused by the fact that the whole of the area surrounded by the explosion-proof nick is torn off by high pressure during blasting, the explosion-proof nick is generally not in a closed curve, but a notch is reserved; the notch is of normal thickness and cannot be torn, so that the connection between the area surrounded by the explosion-proof notch and the shell can be ensured. However, since the explosion-proof scores are generally curved in shape, there may be a large difference in the air pressure value required for tearing throughout the curve, so that it is difficult to accurately adjust the overall tearing air pressure value of the explosion-proof scores. Because the wall thickness of the stainless steel shell is generally thinner, if the overall tearing air pressure value of the explosion-proof nick is smaller, the enclosed area of the explosion-proof nick can generate larger impact force which flies outwards during explosion, so that the shell can be torn from the nick to be larger in nick and extend to the edge of the shell, and the adjacent battery shell is damaged. If the overall tearing air pressure value of the explosion-proof nick is larger, the explosion at the explosion-proof nick is insufficient, and the explosion of the battery can be caused to cause greater danger.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the technical problems that: provided are a method for manufacturing a battery case having an explosion-proof score, a battery case, and a secondary battery.
In order to achieve the above purpose, the present invention provides the following technical solutions:
A method of making a battery housing having an explosion-proof score, comprising the steps of:
s101, taking a shell;
s102, etching on the outer surface and/or the inner surface of the shell to form a plurality of first scores distributed at intervals;
S103, respectively etching between every two adjacent first scratches to form a second scratch, and connecting the first scratches into a whole through each second scratch so as to form an explosion-proof scratch, wherein the scratch residual value of the second scratch is smaller than that of the first scratch.
A method of making a battery housing having an explosion-proof score, comprising the steps of:
s201, taking a shell;
S202, etching to form a continuous linear first notch on the outer surface and/or the inner surface of the shell;
S203, etching a plurality of second scores overlapped on the first scores at intervals along the length direction of the first scores, so that explosion-proof scores are formed, and score residual values of the second scores are smaller than those of the first scores.
Further, the shape of the explosion-proof notch is one or a combination of more of an arc, an elliptical arc, a spline curve and a straight line segment, and the head end and the tail end of the explosion-proof notch are not connected.
Further, a first curvature radius threshold value and a second curvature radius threshold value are preset, wherein the first curvature radius threshold value is larger than the second curvature radius threshold value; the shape of the explosion-proof notch comprises a curve with a curvature radius smaller than a second curvature radius threshold value and a curve or a straight line segment with a curvature radius larger than a first curvature radius threshold value, the straight line segment area or the curve area with the curvature radius larger than the first curvature radius threshold value in the explosion-proof notch is a large curvature area, and the curve area with the curvature radius smaller than the second curvature radius threshold value in the explosion-proof notch is a small curvature area.
Further, the maximum length of the second notch of the large curvature area is larger than the maximum length of the second notch of the small curvature area; and/or
The score residual of the second score of the large curvature region is less than the score residual of the second score of the small curvature region.
Further, the explosion-proof notch comprises a first curve notch, a second curve notch and a connecting notch for connecting the first curve notch and the second curve notch, wherein the first curve notch and the second curve notch are not connected, so that a notch is formed between the first curve notch and the second curve notch; the shape of the first curve notch and the second curve notch is a curve with the maximum curvature radius smaller than the second curvature radius threshold value, and the shape of the connecting notch is a straight line segment or a curve with the minimum curvature radius larger than the first curvature radius threshold value.
Further, the shapes of the first curve nick and the second curve nick are circular arcs, elliptical arcs or plane spiral lines, and the angle ranges of the first curve nick and the second curve nick are 180-270 degrees; the connecting nicks are in the shape of straight line segments, circular arcs with the radius larger than a first curvature radius threshold value or elliptical arcs with the minimum curvature radius larger than the first curvature radius threshold value.
Further, the shell is made of stainless steel materials with the thickness of 0.15-0.3 mm, and the score residual value of the first score is 0.10-0.15 mm; the score residual value of the second score is 0.03 mm-0.09 mm; the first nick and the second nick are groove structures with wide cross sections and narrow bottom, and the width of the bottom of the cross section is 0.03 mm-0.1 mm.
A battery case is manufactured by a manufacturing method of the battery case with explosion-proof nicks.
A secondary battery includes a battery case.
According to the invention, the first scores and the second scores are arranged to be similar to the shape of a dot-dash line, and the blocking effect during blasting can be increased through the first scores, so that the situation that the energy of blasting cannot be absorbed completely after the explosion-proof scores are exploded during blasting, and other parts of the shell are torn to form larger openings is avoided, and therefore the adjacent battery shells are damaged. By selecting the position, the number, the score residual value and the length of the second scores, the tearing difficulty of the small curvature area can be selectively reduced, so that the tearing difficulty of each area of the explosion-proof scores is relatively close, and the condition of insufficient blasting is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
fig. 1 is a flow chart of an embodiment of a method for manufacturing a battery case with explosion-proof scores according to the present invention.
Fig. 2 is a schematic structural view of the housing.
Fig. 3 is a schematic structural view of a first score formed by the manufacturing process.
Fig. 4 is a schematic cross-sectional view of an explosion-proof score.
Fig. 5 is a schematic view of the structure of the battery case after the explosion-proof score is made.
Fig. 6 is a schematic view of the overall structure of the explosion-proof score.
Fig. 7 is a schematic structural view of the first score and the second score.
Fig. 8a, 8b, 8c, 8d and 8e are schematic views of several different shaped anti-burst scores used in performing a burst test.
Fig. 9a is a schematic illustration of the tear of the anti-burst score of fig. 8a to form a notch.
Fig. 9b is a schematic illustration of the tear-off of the vent score of fig. 7.
Fig. 10 is a flowchart of another embodiment of a method of manufacturing a battery case with an explosion-proof score according to the present invention.
The meaning of the reference numerals in the drawings are:
A housing-100; broad side-101; narrow side-102; a top cover-111; a bottom cover-112; explosion-proof nick-200; a first curvilinear score-201; second curve score-202; connecting score-203; notch-204; the openings-205 and 206; a small curvature region-207; large curvature region-208; first scores-211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222; second scores-251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261.
Detailed Description
The following description of the embodiments of the invention is given by way of specific examples, the illustrations provided in the following examples merely illustrate the basic idea of the invention, and the following examples and features of the examples can be combined with one another without conflict.
Example 1
The invention discloses a manufacturing method of a battery case with an explosion-proof notch, and referring to fig. 1, a flowchart of an embodiment of the manufacturing method of the battery case with the explosion-proof notch is shown. The manufacturing method of the battery case with the explosion-proof nick in the embodiment comprises the following steps:
S101, taking a shell 100. Referring to fig. 2, the housing 100 is generally a rectangular parallelepiped with a sheet shape, and includes a top cover 111, a bottom cover 112 opposite to the top cover 111, two wide sides 101 opposite to each other, and two narrow sides 102 opposite to each other. The housing 100 of this shape can be used to produce a battery such as a blade battery, a prismatic battery, or the like. The shell 100 is preferably made of stainless steel materials, and the shell 100 is generally made of stainless steel materials with the wall thickness ranging from 0.15mm to 0.3 mm; in this embodiment, the wall thickness of the stainless steel material housing 100 is 0.18mm±0.005mm. Of course, the housing 100 may be made of an aluminum alloy material, and when the aluminum alloy material is used, the wall thickness of the housing 100 may be much larger than that of the housing 100 when the stainless steel material is used.
S102, referring to FIG. 3, a plurality of first scores are etched on the outer surface and/or the inner surface of the shell 100 at intervals. The score residual values of the plurality of first scores may be the same, so that all the first scores may be formed by one etching; the score residual of the first score is generally in the range of 0.10mm to 0.15 mm. Since the two wide sides 101 are closely attached to the batteries adjacent to both sides during the installation of the battery such as the blade battery and the square battery, the explosion-proof scores 200 are prevented from being torn, and thus the explosion-proof scores 200 are not generally provided on the two wide sides 101 of the case 100. In addition, the top cover 111 of the case 100 is provided with an electrode or the like, and there is little area available for etching the explosion-proof score 200, and it is generally avoided to provide the explosion-proof score 200 on the top cover 111. Accordingly, it is generally optional to etch the anti-explosion score 200 on one of the narrow sides 102 of the housing 100 or on the bottom cover 112 of the housing 100. I.e., the first score of this step, will typically be etched into one of the narrow sides 102 of the housing 100 or into the bottom cover 112 of the housing 100.
Referring to fig. 4, the anti-explosion score 200 (i.e., the first score and the second score) generally has a groove structure with a wide cross section and a narrow cross section, and in this embodiment, the cross sections of the first score and the second score are trapezoidal with a wide cross section and a narrow cross section. The overall tearing air pressure value of the explosion-proof notch 200 is affected by a plurality of factors, and the main affecting factors include the notch residual value T of the explosion-proof notch 200, the width W of the bottom of the cross section of the explosion-proof notch 200, the included angle a between the trapezoid waist and the vertical direction (i.e. the height of the trapezoid), the shape of the explosion-proof notch 200, the wall thickness T of the shell 100, the material of the shell 100, etc. The score residual of the explosion vent 200 is defined as the thickness of the can 100 remaining after the vent 200 is thinned.
S103, referring to FIG. 5, etching each second notch between every two adjacent first notches to form a second notch, so that each second notch forms a shape similar to a dot-dash line; of course, when the head end and/or the tail end of the explosion-proof notch 200 is the second notch, the second notch located at the head end or the tail end is only connected with the adjacent first notch. The plurality of first scores arranged at intervals are connected into a whole through each second score, so that the explosion-proof score 200 is formed, and the score residual value of each second score is smaller than that of the first score. The score residual values of the second scores may be the same or different, and when the score residual values of all the second scores are the same, all the second scores may be formed by one etching. When the score residual values of the second scores are not identical, all the second scores can be formed by etching a plurality of times. The score residual of the second score is generally in the range of 0.03mm to 0.09 mm.
When the cell inside the battery is damaged and emits a large amount of heat and/or releases gas, the pressure inside the case 100 expands sharply; when the explosion-proof nick 200 is arranged on the shell 100, if the air pressure in the shell 100 is too large, the explosion-proof nick 200 is torn off under the action of high air pressure along with the increase of the air pressure, so that the high-pressure air in the shell 100 is discharged from the torn-off position, the air pressure in the shell 100 is rapidly reduced, the explosion of the battery is prevented, and the personal safety of a producer and a user is ensured. The air pressure value that the explosion-proof notch 200 is just torn completely is the whole tearing air pressure value of the explosion-proof notch 200.
If the score residual value t of the explosion-proof score 200 is small, the overall tearing air pressure value of the explosion-proof score 200 is small; when the explosion-proof notch 200 is exploded due to the damage of the battery core, the blocking force at the explosion-proof notch 200 is smaller, so that after the explosion-proof notch 200 is completely exploded, the enclosing part of the explosion-proof notch 200 tears other parts of the shell 100 to form larger openings under the drive of huge impact force, and the adjacent battery shells 100 are damaged. If the score residual value t is large, the explosion-proof score 200 may not be completely torn when the internal gas pressure of the battery reaches the upper limit gas pressure; therefore, the pressure relief opening formed at the explosion-proof notch 200 is smaller, and the gas inside the battery cannot be discharged in time, so that the battery can be excessively expanded to cause explosion. However, since the factors influencing the overall tearing air pressure value of the explosion-proof score 200 are more, when the score residual values of the various places of the explosion-proof score 200 are the same or the score residual values of the various places are the same in several large constituent areas of the explosion-proof score 200, it is difficult to reduce the influence of other factors on the overall tearing air pressure value of the explosion-proof score 200, so that the explosion-proof score 200 can be completely torn, and other places of the housing 100 can not be torn with larger openings.
In this embodiment, the first score and the second score with different score residuals are formed by etching, the tearing difficulty of the anti-explosion score 200 can be integrally improved by increasing the score residuals at the first score, and then the tearing difficulty of the anti-explosion score 200 can be adjusted by setting the second score. The tearing difficulty of the explosion-proof nicks 200 can be adjusted by selecting the position, the number, the nick residual value and the length of the second nicks, so that the tearing difficulty of the explosion-proof nicks 200 can be adjusted more conveniently and accurately, and the tearing difficulty can be selectively reduced in each area of the explosion-proof nicks 200. For example, a longer second score is generally disposed in a region with high tearing difficulty of the anti-explosion score 200, and the score residual value of the second score in the region can be reduced appropriately, so that the tearing difficulty of the region which is originally difficult to tear on the anti-explosion score 200 is reduced by a larger extent, and the tearing difficulty of each region of the anti-explosion score 200 becomes relatively close after adjustment. And the overall tearing air pressure value of the explosion-proof notch 200 is conveniently controlled, so that the overall tearing air pressure value of the explosion-proof notch 200 meets the requirements that the explosion-proof notch 200 can be completely torn open, and other parts of the shell 100 can not be torn open with larger openings.
The bottom widths W of the cross sections of the first score and the second score may be the same, and generally range from 0.03mm to 0.1mm, and in this embodiment, the bottom widths w=0.08 mm of the cross sections of the first score and the second score. The included angle a between the trapezoid waist and the trapezoid height of the cross section of the first notch and the second notch is generally in the range of 25-45 degrees.
Since the smaller the radius of curvature of the curve of the explosion-proof score 200, the greater the difficulty of tearing the region under the same conditions, it is possible to determine whether or not the region is easily torn according to the radius of curvature of the curve of each region of the explosion-proof score 200, thereby roughly determining the set length of the second score. For example, a first radius of curvature threshold value and a second radius of curvature threshold value may be preset, the first radius of curvature threshold value being greater than the second radius of curvature threshold value. The first radius of curvature threshold is generally greater than the width (i.e., the length along the y-axis in fig. 1 or 2) of the narrow side 102 or bottom 112 of the housing 100 where the vent score 200 is located, and the second radius of curvature threshold is generally less than half the width of the narrow side 102 or bottom 112 of the housing 100 where the vent score 200 is located.
The shape of the anti-explosion score 200 includes a curve with a radius of curvature smaller than the second radius of curvature threshold and a curve or straight line segment with a radius of curvature larger than the first radius of curvature threshold, and the straight line segment area or the curve area with a radius of curvature larger than the first radius of curvature threshold in the anti-explosion score 200 is a large curvature area 208, that is, an area easy to tear (an area with small tearing difficulty). The curved area with the radius of curvature smaller than the second radius of curvature threshold in the anti-explosion score 200 is a small curvature area 207, that is, an area that is not easy to tear (an area with high difficulty in tearing). When the second score is provided, the maximum length of the second score of the large curvature region 208 (i.e., the length of the longest second score of the region) may be made greater than the maximum length of the second score of the small curvature region 207, thereby reducing the difficulty of tearing in the region that is not easily torn. Alternatively, the score residual value of the second score in the large curvature region 208 may be smaller than that of the second score in the small curvature region 207, and the tearing difficulty of the region which is not easily torn originally may be reduced more. Of course, the maximum length of the second score of the large curvature region 208 may be larger than the maximum length of the second score of the small curvature region 207, and the score residual value of the second score of the large curvature region 208 may be smaller than the score residual value of the second score of the small curvature region 207.
The overall shape of the explosion-proof notch 200 formed by connecting the first notch and the second notch may be one or more of a circular arc, an elliptical arc, a spline curve and a straight line segment, and the head end and the tail end of the explosion-proof notch 200 are not connected. When the shape of the explosion-proof notch 200 is a closed curve and the explosion-proof notch 200 is torn due to the expansion of gas in the casing 100 caused by the heat generation of the battery cell, the enclosed area of the explosion-proof notch 200 is often torn wholly and is flushed by high pressure, so that secondary damage is easily caused to other battery cells or water-cooled plates and peripheral connection circuits. Therefore, the explosion-proof notch 200 adopts a non-closed shape with the head end and the tail end not connected, so that secondary damage to the battery when the battery cell heats can be avoided.
For example, the explosion-proof score 200 may include a first curved score 201 and a second curved score 202 symmetrically disposed and a connecting score 203 connecting the first curved score 201 and the second curved score 202, wherein the first curved score 201 and the second curved score 202 are not connected to each other, thereby forming a notch 204 between the first curved score 201 and the second curved score 202. Wherein the first curved score 201 and the second curved score 202 are shaped as curves with a maximum radius of curvature less than a second radius of curvature threshold (i.e., a large curvature area 208 at the first curved score 201 and the second curved score 202). The shape of the connecting score 203 is a straight line segment or a curve with a minimum radius of curvature greater than a first radius of curvature threshold (i.e., a small radius of curvature 207 at the connecting score 203). The first curved score 201 and the second curved score 202 are generally circular arcs, elliptical arcs or planar spiral lines, and the angle range of the first curved score 201 and the second curved score 202 is generally 180 degrees to 270 degrees. The shape of the connecting score 203 is generally a straight segment, an arc having a radius greater than a first radius of curvature threshold, or an elliptical arc having a minimum radius of curvature greater than a first radius of curvature threshold.
Referring to fig. 6 and 7, in the present embodiment, the explosion-proof notch 200 is disposed on the bottom cover 112 of the housing 100, and the width of the bottom cover 112 is 32mm. The shape of the connecting score 203 is a straight line segment, and the shape of the first curved score 201 and the second curved score 202 is an arc of a circle having a diameter of 15mm and an angle of 240 ° (i.e., an arc added by 60 ° on the basis of a semicircular arc). In the first curved line notch 201 region, a first notch 211, a second notch 251, a first notch 212, a second notch 252, a first notch 213, a second notch 253, a first notch 214, a second notch 254, a first notch 215, a second notch 255, a first notch 216, and a second notch 256 are provided at intervals, in the connecting notch 203 region, a first notch 217, a second notch 257, a first notch 218, a second notch 258, a first notch 219, a second notch 259, a first notch 220, and a second notch 260 are provided at intervals, and in the second curved line notch 202 region, a first notch 221, a second notch 261, and a first notch 222 are provided at intervals. The score residual value of each first score is 0.13mm, and the score residual value of each second score is about 0.08 mm. By setting the angle of the first curved score 201 and the second curved score 202 to be greater than 180 °, the head end and the tail end of the explosion-proof score 200 (i.e., the end of the first curved score 201 where the first score 211 is provided and the end of the second curved score 202 where the first score 222 is provided) are concave inward, so that a part of the impact force can be converted into an inward tearing force when the explosion-proof score 200 bursts, thereby counteracting a part of the outward tearing force and reducing the size of the opening formed by tearing.
In this embodiment, the explosion-proof notch 200 is formed by laser etching; wherein the first notch and the second notch are respectively formed by two laser etching. First, first scores 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221 and 222 were formed by first laser etching. Then, a second score 251, a second score 252, a second score 253, a second score 254, a second score 255, a second score 256, a second score 257, a second score 258, a second score 259, a second score 260, and a second score 261 are formed between the 12 first scores by a second laser etching, so that the 12 first scores and the 11 second scores are connected to form a whole, and the shape of the explosion-proof score 200 formed by the two laser etching is shown in fig. 7. Of course, when the score residual values of the second scores are not identical, the number of times of laser etching can be increased. Note that the thicker line of the second score in fig. 7 is only for the sake of distinguishing the first score and the second score from the drawing, and does not represent the actual cross-sectional widths of the first score and the second score.
Wherein the second score 257, the second score 258, the second score 259, and the second score 260, which are located in the region of the relatively easy-to-tear connecting score 203, are shorter in length and substantially approximate in length. In the areas of the first curved score 201 and the second curved score 202 which are not easy to tear apart, the longest second score is the second score 254 and the second score 261 respectively, and the lengths of the second score 254 and the second score 261 are far greater than those of the second score 257, the second score 258, the second score 259 and the second score 260, that is, the second score 254 and the second score 261 are easier to tear, so that the tearing difficulty of the areas of the first curved score 201 and the second curved score 202 is reduced more than that of the areas of the connecting score 203 after the second scores are arranged.
Referring to fig. 8a, 8b, 8c, 8d and 8e, which are respectively schematic diagrams of the explosion-proof scores 200 of several different shapes used in the explosion test of the present application, during the explosion process, the explosion-proof scores 200 of fig. 8a, 8b and 8c each tear a larger opening 205 extending to the boundary of the side surface of the casing 100 on the casing 100, and referring to fig. 9a, which is a schematic diagram of the opening 205 formed after the explosion-proof scores 200 of fig. 8a are torn, the broken line part of the drawing is the path of the tear. The explosion vent 200 of fig. 8d and 8e may not be fully exploded (i.e., the explosion vent 200 may not be fully exploded) due to the large difference in tear difficulty between the areas. In the case of performing the explosion test using the explosion vent 200 (i.e., the explosion vent 200 in fig. 5) in this embodiment, the explosion vent 200 can be completely ruptured each time, and the opening 206 ruptured in the area outside the explosion vent 200 of the case 100 is very small. Please refer to fig. 9b, which is a schematic diagram illustrating the formation of the opening 206 after the explosion-proof notch 200 in fig. 5 is torn (the broken line part in the drawing is a torn path); as can be seen from fig. 9b, the gap 206 is located at a larger distance from the side boundary of the case 100, so that the adjacent battery case 100 is not damaged.
In this embodiment, 12 first scores and 11 second scores are set to be similar to the shape of a dash-dot line and are sequentially connected to form the explosion-proof score 200, and since the score residual value of the first score is larger, the blocking effect during explosion can be increased through the first score, so that the situation that the explosion energy cannot be fully absorbed after the explosion at the explosion-proof score 200 during explosion is avoided, and other parts of the shell 100 are torn to form larger openings, thereby damaging the adjacent battery shells 100 is avoided. Because the score residual value of the second score is smaller, the tearing difficulty of the explosion-proof score 200 at the small curvature area 207 can be selectively reduced by selecting the position, the number, the score residual value and the length of the second score, so that the tearing difficulty of each area of the explosion-proof score 200 is relatively close, and the condition of insufficient explosion is avoided.
Example 2
Referring to fig. 10, a flowchart of a method for manufacturing a battery case with explosion-proof scores according to another embodiment of the invention is shown. The manufacturing method of the battery case with the explosion-proof nick in the embodiment comprises the following steps:
S201, taking a shell 100. The shape and material of the housing 100 may be the same as those of the housing 100 in embodiment 1.
S202, forming a continuous linear first notch on the outer surface and/or the inner surface of the shell 100 through one-time laser etching; the first score is formed in a shape as shown in fig. 6. The etching depth of each part of the first mark is 0.05mm, namely the etching residual value of each part of the first mark is 0.13mm.
S203, forming a plurality of second scores overlapped on the first scores by one or more laser etching intervals along the length direction of the first scores, so as to form explosion-proof scores 200, and enabling the score residual values of the second scores to be smaller than those of the first scores. In this embodiment, the second scores 251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261 are formed by the second laser etching, and a total of 11 second scores are formed. When the laser etching is performed in the step, the etching is continued downwards by 0.05mm on the basis of the first laser etching, namely the total etching depth of the second notch through the two laser etching is about 0.10mm, and the etching residual value is about 0.08mm.
This embodiment differs from embodiment 1 only in that: the explosion-proof notch 200 of the present embodiment includes a continuous linear first notch and a plurality of second notches disposed at intervals along the length of the first notch and overlapping the first notch; that is, the overall shape of the first scores is the same as that of the explosion-proof scores 200, and the respective second scores are formed by further reducing score residual values in partial areas of the first scores. In this embodiment, since the first notch is formed by performing laser etching along a continuous path, a control process of laser etching when forming the first notch is simplified.
The invention also discloses a secondary battery which can be a power battery or an energy storage battery, and the shell of the secondary battery can adopt the battery shell of any embodiment. Of course, the secondary battery further includes a battery cell housed in a battery case and other necessary structures for a conventional secondary battery, which are prior art and are not described herein.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (10)
1.A method of making a battery housing having an explosion-proof score, comprising the steps of:
s101, taking a shell;
s102, etching on the outer surface and/or the inner surface of the shell to form a plurality of first scores distributed at intervals;
S103, respectively etching between every two adjacent first scratches to form a second scratch, and connecting the first scratches into a whole through each second scratch so as to form an explosion-proof scratch, wherein the scratch residual value of the second scratch is smaller than that of the first scratch.
2. A method of making a battery housing having an explosion-proof score, comprising the steps of:
s201, taking a shell;
S202, etching to form a continuous linear first notch on the outer surface and/or the inner surface of the shell;
S203, etching a plurality of second scores overlapped on the first scores at intervals along the length direction of the first scores, so that explosion-proof scores are formed, and score residual values of the second scores are smaller than those of the first scores.
3. The method of manufacturing a battery case with an explosion-proof score according to claim 1 or 2, wherein: the shape of the explosion-proof notch is one or a combination of more of an arc, an elliptical arc, a spline curve and a straight line segment, and the head end and the tail end of the explosion-proof notch are not connected.
4. A method of making a battery housing having an explosion-proof score according to claim 3, wherein: presetting a first curvature radius threshold value and a second curvature radius threshold value, wherein the first curvature radius threshold value is larger than the second curvature radius threshold value; the shape of the explosion-proof notch comprises a curve with a curvature radius smaller than a second curvature radius threshold value and a curve or a straight line segment with a curvature radius larger than a first curvature radius threshold value, the straight line segment area or the curve area with the curvature radius larger than the first curvature radius threshold value in the explosion-proof notch is a large curvature area, and the curve area with the curvature radius smaller than the second curvature radius threshold value in the explosion-proof notch is a small curvature area.
5. The method of making a battery can with an explosion vent as set forth in claim 4, wherein: the maximum length of the second nick of the large curvature area is greater than the maximum length of the second nick of the small curvature area; and/or
The score residual of the second score of the large curvature region is less than the score residual of the second score of the small curvature region.
6. The method of making a battery can with an explosion vent as set forth in claim 4, wherein: the anti-explosion notch comprises a first curve notch, a second curve notch and a connecting notch for connecting the first curve notch with the second curve notch, wherein the first curve notch and the second curve notch are not connected, so that a notch is formed between the first curve notch and the second curve notch; the shape of the first curve notch and the second curve notch is a curve with the maximum curvature radius smaller than the second curvature radius threshold value, and the shape of the connecting notch is a straight line segment or a curve with the minimum curvature radius larger than the first curvature radius threshold value.
7. The method of making a battery can with an explosion vent as set forth in claim 6, wherein: the first curve nick and the second curve nick are in the shape of circular arc, elliptical arc or plane spiral line, and the angle range of the first curve nick and the second curve nick is 180-270 degrees; the connecting nicks are in the shape of straight line segments, circular arcs with the radius larger than a first curvature radius threshold value or elliptical arcs with the minimum curvature radius larger than the first curvature radius threshold value.
8. The method of manufacturing a battery case with an explosion-proof score according to claim 1 or 2, wherein: the shell is made of stainless steel materials with the thickness of 0.15-0.3 mm, and the score residual value of the first score is 0.10-0.15 mm; the score residual value of the second score is 0.03 mm-0.09 mm; the first nick and the second nick are groove structures with wide cross sections and narrow bottom, and the width of the bottom of the cross section is 0.03 mm-0.1 mm.
9. A battery housing, characterized in that: a battery case with explosion-proof notch according to any one of claims 1 to 8.
10. A secondary battery characterized in that: a battery housing comprising the battery of claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410090193.8A CN117913428A (en) | 2024-01-22 | 2024-01-22 | Manufacturing method of battery shell with explosion-proof nick, battery shell and secondary battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410090193.8A CN117913428A (en) | 2024-01-22 | 2024-01-22 | Manufacturing method of battery shell with explosion-proof nick, battery shell and secondary battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211578857U (en) * | 2020-03-31 | 2020-09-25 | 深圳市科达利实业股份有限公司 | Battery explosion-proof structure, battery apron and battery |
| CN215816251U (en) * | 2021-09-10 | 2022-02-11 | 厦门海辰新能源科技有限公司 | Explosion-proof valve for battery, battery and energy storage device |
| WO2023220881A1 (en) * | 2022-05-16 | 2023-11-23 | 宁德时代新能源科技股份有限公司 | End cover, battery cell, battery, and electric device |
| CN117283145A (en) * | 2023-09-26 | 2023-12-26 | 常州金品精密技术有限公司 | Manufacturing method of battery shell with explosion-proof nick, battery and electric equipment |
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- 2024-01-22 CN CN202410090193.8A patent/CN117913428A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211578857U (en) * | 2020-03-31 | 2020-09-25 | 深圳市科达利实业股份有限公司 | Battery explosion-proof structure, battery apron and battery |
| CN215816251U (en) * | 2021-09-10 | 2022-02-11 | 厦门海辰新能源科技有限公司 | Explosion-proof valve for battery, battery and energy storage device |
| WO2023220881A1 (en) * | 2022-05-16 | 2023-11-23 | 宁德时代新能源科技股份有限公司 | End cover, battery cell, battery, and electric device |
| CN117283145A (en) * | 2023-09-26 | 2023-12-26 | 常州金品精密技术有限公司 | Manufacturing method of battery shell with explosion-proof nick, battery and electric equipment |
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