CN216791882U - Fatigue life tester for battery shell - Google Patents
Fatigue life tester for battery shell Download PDFInfo
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- CN216791882U CN216791882U CN202122745370.6U CN202122745370U CN216791882U CN 216791882 U CN216791882 U CN 216791882U CN 202122745370 U CN202122745370 U CN 202122745370U CN 216791882 U CN216791882 U CN 216791882U
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Abstract
The utility model belongs to the technical field of auxiliary detection tools, and particularly relates to a fatigue life testing device for a battery shell, which comprises a body part and an air hole arranged in the body part, wherein the body part is provided with a hard surface and a soft surface which are integrally connected, the hard surface is used for corresponding to a non-testing surface of the battery shell, the soft surface is used for corresponding to a testing surface of the battery shell, the air hole is communicated with the inside of the body part, the inside of the body part is a closed cavity, and the air hole is used for inflating the inside of the body part so as to enable the soft surface to bulge and extrude the testing surface of the battery shell from the inside of the battery shell. The utility model solves the problem that the stress of a welding structure is influenced by the large deformation of the top cover and the side surface of the battery, ensures the safety, reliability, accuracy and high efficiency of the fatigue life test of the battery shell, and promotes the authenticity of stress evaluation of the battery module.
Description
Technical Field
The utility model belongs to the technical field of measuring instruments, and particularly relates to a fatigue life testing instrument for a battery shell.
Background
As a green energy source, power cells in which a hard shell battery case is attached to a top cap, typically by laser welding techniques. When the hard shell battery increases along with the increase of the charging and discharging cycle times, on one hand, the roll core of the hard shell battery gradually expands, the thickness of the battery is increased after the roll core of the hard shell battery expands, the large surface of the shell body is subjected to a cyclic fluctuation and gradually increased stress, and meanwhile, the corresponding laser welding structure of the shell body and the top cover is also subjected to a cyclic fluctuation stress in the thickness direction of the battery; on the other hand, the electrochemical reaction of the cell produces gas which also subjects the laser welded structure of the hard-shell cell to a gradually increasing cyclic load. Therefore, the long-term joint action of the cyclic stress on the laser welding structure of the hard-shell battery can cause fatigue at the welding position, reduce the welding strength and possibly cause the safety risk of early cracking of the welding seam.
However, the structural adaptability of the conventional fatigue life testing device for the shell laser welding structure of the hard-shell battery is poor, and the situation that the battery top cover and the side surface deform due to stress action on the battery top cover and the side surface in the fatigue life testing process of the shell laser welding structure of the hard-shell battery is not considered, so that the testing device and the testing method not only greatly influence the fatigue life of the shell laser welding structure of the hard-shell battery, but also cause the testing result to be inaccurate.
In view of the above, it is necessary to provide a technical solution to the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to: the fatigue life testing device for the battery shell can solve the problem that the stress of a welding structure is influenced by large deformation of a battery top cover and the side face, ensures the safety, reliability, accuracy and high efficiency of the fatigue life testing of the battery shell, and promotes the authenticity of stress evaluation of a battery module.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a battery case fatigue life testing fixture, comprising:
a body part having a hard surface and a soft surface integrally connected, the hard surface being for a non-test surface corresponding to a battery case, the soft surface being for a test surface corresponding to the battery case;
and the air hole is arranged in the body part and communicated with the inside of the body part, the inside of the body part is a closed cavity, and the air hole is used for inflating the inside of the body part so as to enable the soft surface to bulge and extrude the test surface from the inside of the battery shell.
As an improvement of the battery case fatigue life tester according to the present invention, the main body has two soft surfaces, the two soft surfaces are disposed opposite to each other on the main body, and the two soft surfaces are respectively used for two opposite large surfaces of the battery case.
As an improvement of the battery case fatigue life tester according to the present invention, the main body has four hard surfaces, the four hard surfaces are disposed around a side portion of the main body, opposite sides of each hard surface are respectively connected to the soft surfaces, and the main body has a rectangular or square shape.
As an improvement of the battery case fatigue life tester according to the present invention, the main body has two hard surfaces, the two hard surfaces are oppositely disposed on the main body, the two hard surfaces are connected by the soft surface, and the main body has a cylindrical or elliptic cylindrical shape.
In an improvement of the apparatus for testing fatigue life of a battery case according to the present invention, the air hole is connected to an air tube, the air hole is disposed on the hard surface, the number of the air holes may be one or more, each of the air holes may be connected to an air pump through the air tube, and the air tube is configured to apply air pressure to the inside of the main body from the air hole so as to swell the soft surface and press the testing surface of the battery case from the inside of the battery case, wherein in the square battery case, the testing surface of the battery case is a large surface of the battery case, and the non-testing surface of the battery case includes a battery top cover, a bottom surface and side surfaces of the battery case.
As an improvement of the fatigue life testing device for the battery case, the hard surface is provided with a metal sheet, the metal sheet is arranged on the outer surface of the hard surface, the metal sheet ensures that the position of the body part can be better fixed when the body part is arranged in the battery case, the metal sheet can be used for connecting a battery top cover, and the metal sheet can be connected with positive and negative poles of the battery top cover.
As an improvement of the apparatus for testing the fatigue life of a battery case according to the present invention, the hard surface is provided with one or more pairs of the metal sheets, and each pair of the metal sheets is symmetrically distributed along the center line of the air hole.
In an improvement of the battery case fatigue life tester according to the present invention, an area of the soft surface is larger than an area of the hard surface, and the area of the soft surface is smaller than or equal to the area of the test surface of the battery case.
As an improvement of the fatigue life tester for battery cases according to the present invention, the material of the soft surface is an elastic colloid, and the material of the elastic colloid may be a high-elasticity polymer material.
As an improvement of the fatigue life tester for the battery case, the hard surface is made of metal or thermosetting plastic, and the hard surface has no elasticity and does not expand, so that the battery case can be prevented from deforming at the top cover, the bottom surface and the side surfaces of the battery case.
The utility model has the beneficial effects that: the utility model comprises a body part and an air hole arranged on the body part, wherein the body part is provided with a hard surface and a soft surface which are integrally connected, the hard surface is used for corresponding to a non-testing surface of a battery shell, the soft surface is used for corresponding to a testing surface of the battery shell, in the square battery shell, the testing surface of the battery shell is a large surface of the battery shell, the non-testing surface of the battery shell comprises a battery top cover, a bottom surface and side surfaces of the battery shell, when the fatigue life of a laser welding structure of the battery shell is tested, the body part is arranged in the battery shell, the air hole is communicated with the interior of the body part, the interior of the body part is a closed cavity, the air is filled into the interior of the body part through the air hole, the soft surface can be bulged and the testing surface of the battery shell is extruded from the interior of the battery shell, and meanwhile, the hard surface can ensure that the non-testing surface of the battery shell cannot generate deformation phenomenon, therefore, the battery top cover, the bottom surface and the side surface of the battery shell cannot be stressed by a testing device, so that the fatigue life testing of the laser welding structure of the battery shell is accurate and reliable, meanwhile, the testing result can reflect the fatigue life condition of the laser welding structure of the battery shell and the top cover under the constraint of the battery module more truly, and the evaluation of the safety and reliability of the battery is more facilitated.
Drawings
Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a perspective view of a test device according to a first embodiment of the present invention.
Fig. 2 is a perspective view of a battery case according to a first embodiment of the present invention.
FIG. 3 is a schematic view showing the position of a soft surface of a test device according to a first embodiment of the present invention.
Fig. 4 is a schematic view showing the position of a hard surface of a test device according to a first embodiment of the present invention.
FIG. 5 is a perspective view of a test device according to a second embodiment of the present invention.
Fig. 6 is a perspective view of a battery case according to a third embodiment of the present invention.
Fig. 7 is a perspective view of a test device according to a third embodiment of the present invention.
Fig. 8 is a schematic structural view of a test device according to a fourth embodiment of the present invention.
Wherein the reference numerals are as follows:
1-a body portion; 11-hard surface; 12-soft flour;
2-a battery case; 21-non-test side; 22-a test face;
3-air holes;
4-air pipe;
5-a metal sheet;
6-air pump.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. The description and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, detachable connections, 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 by those skilled in the art according to specific situations.
The structure adaptability and the poor stability of the current casing laser welding structure fatigue life tester of the hard shell battery do not consider the stress action to the battery top cover and the side surface in the casing laser welding structure fatigue life test process of the hard shell battery, thereby leading to the deformation of the battery top cover and the side surface.
The present invention will be described in more detail below with reference to fig. 1 to 8 and a plurality of embodiments, but the present invention is not limited thereto.
Implementation mode one
A fatigue life tester for battery case, as shown in FIGS. 1 to 4, comprises:
a main body part 1, wherein the main body part 1 is provided with a hard surface 11 and a soft surface 12 which are integrally connected, the hard surface 11 is used for corresponding to a non-test surface 21 of the battery shell 2, and the soft surface 12 is used for corresponding to a test surface 22 of the battery shell 2;
and an air hole 3 provided in the main body 1 and communicating with the inside of the main body 1, the inside of the main body 1 being a closed cavity, the air hole 3 being configured to inflate the inside of the main body 1 to swell the soft surface 12 and to press the test surface 22 from the inside of the battery case 2.
Wherein, in the square battery shell 2, the testing surface 22 of the battery shell 2 is the large surface of the battery shell 2, the non-testing surface 21 of the battery shell 2 comprises the battery top cover, the bottom surface and the side surfaces of the battery shell 2, when the fatigue life test of the laser welding structure of the battery shell 2 is carried out, the body part 1 is arranged in the battery shell 2, the air hole 3 is communicated with the inside of the body part 1, the inside of the body part 1 is a closed cavity, the air hole 3 is used for inflating the inside of the body part 1, the soft surface 12 can be bulged and the testing surface 22 of the battery shell 2 is extruded from the inside of the battery shell 2, meanwhile, the hard surface 11 can ensure that the non-testing surface 21 of the battery shell 2 can not generate the phenomenon of deformation, therefore, the battery top cover, the bottom surface and the side surfaces of the battery shell 2 can not be stressed by the testing apparatus, thereby ensuring the fatigue life test accuracy and reliability of the laser welding structure of the battery shell 2, and the fatigue life S-N curve of the laser welding structure can be accurately obtained.
In the present embodiment, in order to make the main body 1 correspond to the shape of the square battery case 2, the main body 1 is also shaped as a rectangular parallelepiped, the main body 1 has two soft surfaces 12 and four hard surfaces 11, the two soft surfaces 12 are oppositely disposed in parallel on the main body 1, and the four hard surfaces 11 are disposed around the side portion of the main body 1, wherein two of the four hard surfaces 11 are oppositely disposed in parallel, and opposite sides of each hard surface 11 are respectively connected to the soft surfaces 12, so that the inside of the main body 1 becomes a sealed chamber.
In the interior of the battery case 2, the two soft surfaces 12 respectively correspond to two oppositely arranged large surfaces of the battery case 2, two oppositely arranged hard surfaces 11 of the four hard surfaces 11 respectively correspond to two side surfaces of the battery case 2, one hard surface 11 of the remaining two oppositely arranged hard surfaces 11 corresponds to a battery top cover of the battery case 2, the other hard surface 11 corresponds to a bottom surface of the battery case 2, and the four hard surfaces 11 ensure that the battery top cover, the bottom surface and the two side surfaces of the battery case 2 cannot be stressed by a test instrument.
In the test device of the present embodiment, the soft surface 12 is larger in area than the hard surface 11, the soft surface 12 is made of an elastic gel, and the hard surface 11 is made of a metal or a thermosetting plastic, wherein when the hard surface 11 is made of a metal having a high hardness, the hard surface 11 of the test device does not swell and the hard surface 11 can be brought into close contact with the battery case 2, and thus, no force is applied to the battery case 2 and no influence is exerted on the fatigue life test of the laser welding structure of the battery case 2.
In order to ensure airtightness for filling the interior of the main body 1 with air from the air hole 3, the air hole 3 is connected to the air tube 4, and the air hole 3 is provided in the hard surface 11 of the main body 1. in the test device of the present invention, a through hole corresponding to the air hole 3 may be formed in one of the top cover, the bottom surface, and the two side surfaces of the battery case 2 during the test, thereby ensuring that the air tube 4 can apply a gas pressure from the air hole 3 to the interior of the main body 1, so that the soft surface 12 bulges and presses the test surface 22 of the battery case 2 from the interior of the battery case 2.
Second embodiment
Unlike the first embodiment, referring to fig. 5, in the test device of the present embodiment, the hard surface 11 is provided with the metal sheet 5, the metal sheet 5 is provided on the outer surface of the hard surface 11 so that the battery case 2 and the hard surface 11 of the test device have a certain interval therebetween, and the metal sheet 5 may be integrally connected to one of the four hard surfaces 11 of the body portion 1 corresponding to the hard surface 11 of the battery top cover of the battery case 2, and the metal sheet 5 may be used for connecting the battery top cover.
Wherein, the material of the metal sheet 5 can be pure metal or alloy, and the purpose of setting comprises: on one hand, the metal sheet 5 can enable the battery top cover and the hard surface 11 to have a certain interval, so that the hard surface 11 is prevented from being expanded due to insufficient hardness and touching the battery shell 2, the hard surface 11 is effectively prevented from generating acting force on the battery shell 2, and the fatigue life test of the laser welding structure of the battery shell 2 is prevented from being influenced; on the other hand, the metal sheet 5 can secure a position of the main body 1 better when the main body 1 is placed inside the battery case 2.
Preferably, the air hole 3 is formed in the hard surface 11 of the main body 1 corresponding to the battery top cover of the battery case 2, the battery top cover of the battery case 2 is provided with a through hole corresponding to the air hole 3, and the hard surface 11 of the battery top cover corresponding to the battery case 2 is provided with one or more pairs of metal sheets 5, each pair of metal sheets 5 is symmetrically distributed along the center line of the air hole 3, so that the fixing stability of the main body 1 is ensured.
Other structures of this embodiment are the same as those of the first embodiment, and are not described again here.
Third embodiment
The present embodiment is different from the second embodiment in that, as shown in fig. 6 to 7, when the battery case 2 is a cylinder or an elliptic cylinder, in order to make the body portion 1 correspond to the shape of the battery case 2, the body portion 1 may be configured as a cylinder or an elliptic cylinder, the body portion 1 has two hard surfaces 11, the two hard surfaces 11 are oppositely disposed in parallel on the body portion 1, the two hard surfaces 11 are connected by a soft surface 12, the soft surface 12 is a cylindrical surface or an elliptic cylindrical surface, the testing surface 22 of the battery case 2 is a side surface of the battery case 2, the non-testing surface 21 of the battery case 2 is a battery top cover and a bottom surface of the battery case 2, and during the fatigue life test of the laser welding structure of the battery case 2, the hard surface 11 can ensure that the battery top cover and the bottom surface of the battery case 2 are not deformed, and therefore, neither the battery top cover nor the bottom surface of the battery case 2 is subjected to the stress of a testing instrument, thereby, the fatigue life test of the laser welding structure of the battery shell 2 is ensured to be accurate and reliable.
Other structures of this embodiment are the same as those of the second embodiment, and are not described again here.
Embodiment IV
The present embodiment is different from the second embodiment in that, as shown in fig. 8, the air hole 3 is connected to an air pump 6 through an air pipe 4, the air pump 6 can apply different circulating air pressures from the air hole 3 to the inside of the main body 1 through the air pipe 4, and when the air pipe 4 applies air pressure from the air hole 3 to the inside of the main body 1, the soft surface 12 can be swelled to press the test surface 22 of the battery case 2 from the inside of the battery case 2, thereby accurately simulating the stress state of the battery in the module.
Other structures of this embodiment are the same as those of the second embodiment, and are not described again here.
Obviously, the utility model can effectively avoid the condition that the stress state of the welding structure is influenced by the large deformation of the top cover and the side surface of the battery, truly simulates the stress state of the battery in the module, ensures the safety, reliability, accuracy and high efficiency of the fatigue life test of the battery shell, and promotes the authenticity of the stress evaluation of the battery module.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the utility model as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A battery case fatigue life testing fixture, comprising:
a body section (1), wherein the body section (1) has a hard surface (11) and a soft surface (12) which are integrally connected, the hard surface (11) is used for corresponding to a non-test surface (21) of a battery shell (2), and the soft surface (12) is used for corresponding to a test surface (22) of the battery shell (2);
and the air hole (3) is arranged in the body part (1) and is communicated with the inside of the body part (1), the inside of the body part (1) is a closed cavity, and the air hole (3) is used for inflating the inside of the body part (1) so as to enable the soft surface (12) to bulge and extrude the test surface (22) from the inside of the battery shell (2).
2. The battery case fatigue life test fixture of claim 1, wherein: the main body (1) has two soft surfaces (12), and the two soft surfaces (12) are provided to the main body (1) so as to face each other.
3. A battery case fatigue life testing fixture according to claim 2, wherein: the body part (1) is provided with four hard surfaces (11), the four hard surfaces (11) are arranged around the side part of the body part (1), and two opposite sides of each hard surface (11) are respectively connected to the soft surfaces (12).
4. The battery case fatigue life testing fixture of claim 1, wherein: the body part (1) is provided with two hard surfaces (11), the two hard surfaces (11) are oppositely arranged on the body part (1), and the two hard surfaces (11) are connected through the soft surface (12).
5. A battery case fatigue life testing fixture according to claim 3 or 4, wherein: the air hole (3) is connected with an air pipe (4), and the air hole (3) is formed in the hard surface (11).
6. The battery case fatigue life testing fixture of claim 5, wherein: the hard surface (11) is provided with a metal sheet (5).
7. The battery case fatigue life testing fixture of claim 6, wherein: the hard surface (11) is provided with one or more pairs of metal sheets (5), and each pair of metal sheets (5) is symmetrically distributed along the central line of the air hole (3).
8. The apparatus for testing fatigue life of battery case according to any of claims 1 to 4, wherein: the area of the soft surface (12) is larger than that of the hard surface (11).
9. The apparatus for testing fatigue life of battery case according to any of claims 1 to 4, wherein: the soft surface (12) is made of elastic colloid.
10. The apparatus for testing fatigue life of battery case according to any of claims 1 to 4, wherein: the hard surface (11) is made of metal or thermosetting plastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122745370.6U CN216791882U (en) | 2021-11-10 | 2021-11-10 | Fatigue life tester for battery shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122745370.6U CN216791882U (en) | 2021-11-10 | 2021-11-10 | Fatigue life tester for battery shell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216791882U true CN216791882U (en) | 2022-06-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122745370.6U Active CN216791882U (en) | 2021-11-10 | 2021-11-10 | Fatigue life tester for battery shell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216791882U (en) |
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2021
- 2021-11-10 CN CN202122745370.6U patent/CN216791882U/en active Active
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