Pouch-type battery cell impact test device and pouch-type battery cell impact test method using the impact test device

Abstract

The present invention relates to an impact test device for pouch-type battery cells and a method for impact testing pouch-type battery cells using the same, and more specifically, to an impact test device for pouch-type battery cells comprising a flat bottom plate, a jig including first and second jig members having a rectangular outer shape and positioned on both sides of the pouch-type battery cell, and a pressing member for pressing predetermined portions of the pouch-type battery cell, and a method for impact testing pouch-type battery cells using the same.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0000456, filed on January 3, 2022, and all the contents disclosed in the documents of the Korean patent application are incorporated herein by reference.

[0002] The present invention relates to an impact test apparatus for a pouch-type battery cell and an impact test method for a pouch-type battery cell using the same. Specifically, by using a jig in which a cut portion and a through portion are formed, the accuracy and reliability of the impact test result of the pouch-type battery cell can be improved. The present invention relates to an impact test apparatus for a pouch-type battery cell and an impact test method for a pouch-type battery cell using the same.

Background Art

[0003] Recently, due to air pollution caused by the use of fossil fuels and the development of alternative energy due to energy depletion, the demand for secondary batteries that can store electrical energy produced has been increasing. Rechargeable secondary batteries are closely used in daily life, such as being used in mobile devices, electric vehicles, hybrid electric vehicles, etc.

[0004] As an energy source for various electronic devices that are indispensable in modern society, secondary batteries are increasing in required capacity due to the increasing use and complexity of mobile devices and the development of electric vehicles, etc. To meet the needs of users, a large number of battery cells are arranged in small devices, but battery modules that electrically connect a large number of battery cells or battery packs equipped with a large number of such battery modules are used in vehicles, etc.

[0005] On the other hand, when the device is an electric vehicle, vibrations and impacts may occur during operation, and the battery may be impacted by a collision between vehicles. Therefore, the safety of the battery against impacts is required, and thus the accuracy and reliability of the impact verification test of the battery are required.

[0006] Figure 1 shows an impact test device according to the prior art. As shown in Figure 1, the impact test device includes a jig 10 for fixing a battery pack, a punch portion 20 that drops from a predetermined height to apply an impact to the battery pack, a body portion 30 where one side is connected to the jig 10 and the other side is connected to the punch portion 20, and a control portion 40 that digitizes and stores test conditions.

[0007] When performing an impact test on a battery cell using an impact test device according to the prior art, since there is no separate support portion for maintaining the shape of the battery cell, when fixing the battery cell to the jig 10, bending or breaking of the battery cell may occur, which may reduce the reliability and accuracy of the test results.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] In order to solve the above problems, the present invention aims to provide an impact test device for a pouch-type battery cell that can induce deformation only at the pressing portion while maintaining the original shape of the pouch-type battery cell during an impact test of the pouch-type battery cell, and an impact test method for a pouch-type battery cell using the same.

[0010] Furthermore, the present invention aims to provide an impact test device for a pouch-type battery cell that is simple in structure and easy to operate and store, and an impact test method for a pouch-type battery cell using the same.

[0011] Furthermore, an object of the present invention is to provide an impact test apparatus for a pouch-type battery cell having a structure that can easily measure the temperature change of the pouch-type battery cell during an impact test and further prevent damage to the apparatus for temperature measurement, and an impact test method for a pouch-type battery cell using the same.

Means for Solving the Problems

[0012] In order to achieve the above object, the impact test apparatus according to the present invention includes a flat bottom plate (100), a jig (200) including a first jig member (210) and a second jig member (220) located on both side surfaces of the pouch-type battery cell (C) and having a square outer shape, and a pressing member (300) for pressing a predetermined portion of the pouch-type battery cell (C).

[0013] Further, in the impact test apparatus according to the present invention, a first incision portion (211) recessed inwardly by a predetermined area is provided on each of the upper side and the lower side of the first jig member (210), and a first through portion (212) is formed at the center portion. A second incision portion (221) recessed inwardly by a predetermined area is provided on each of the upper side and the lower side of the second jig member (220), and a second through portion (222) is formed at the center portion.

[0014] Further, in the impact test apparatus according to the present invention, a plurality of fastening members (230) are provided at the edges of the first jig member (210) and the second jig member (220) for adjusting the distance between the first jig member (210) and the second jig member (220) and fixing them to each other.

[0015] Further, in the impact test apparatus according to the present invention, the pressing member (300) includes a flat pressing plate (310) and a pressing cylinder (320) protruding from one side surface of the pressing plate (310).

[0016] In addition, in the impact test device according to the present invention, the pressing cylinder (320) is characterized by having a hemispherical shape.

[0017] In addition, in the impact test device according to the present invention, on both side edges of the other side surface of the pressing plate (310), a pair of bent portions (311) are formed which extend in the vertical direction by a predetermined length so as to form a storage space S and then are bent to face each other.

[0018] In addition, in the impact test device according to the present invention, the diameter (W1) of the pressing cylinder (320) is smaller than the width (W2) of the incision.

[0019] In addition, an impact test method using the above-described impact test device for a pouch-type battery cell includes a first step of fixing a pouch-type battery cell (C) in a state where it is positioned between a first jig member (210) and a second jig member (220), a second step of bringing the jig (200) into close contact with one side surface of the bottom plate (100) in a state where the pouch-type battery cell (C) is fixed, and a third step of pressing a predetermined portion of the pouch-type battery cell (C) fixed to the jig (200) with a pressing member (300).

[0020] In addition, in the impact test method according to the present invention, prior to the third step, the method further includes a step of connecting a sensing unit (400) to the side surface of the pouch-type battery cell (C).

[0021] In addition, in the impact test method according to the present invention, the sensing unit (400) includes a sensing pad (410) attached to the side surface of the pouch-type battery cell (C) and a sensing cable (420) having one side connected to the sensing pad (410), and the sensing pad (410) and the sensing cable (420) are arranged so as to penetrate through a first through portion (212) of the first jig member (210) or a second through portion (222) of the second jig member (220).

[0022] Further, in the impact test method according to the present invention, in the first step, the electrode lead of the pouch-type battery cell (C) is bent at a predetermined angle.

[0023] Further, in the impact test method according to the present invention, the predetermined angle is 80° or more.

Advantages of the Invention

[0024] As described above, according to the impact test apparatus for a pouch-type battery cell and the impact test method for a pouch-type battery cell using the same according to the present invention, a cut portion is formed in the jig member so that the edge portion of the pouch-type battery cell can be fixed and pressing and deformation can be induced only at a desired portion. Therefore, there is an advantage that the reproducibility and reliability of the test results can be improved.

[0025] Further, according to the impact test apparatus for a pouch-type battery cell and the impact test method for a pouch-type battery cell using the same according to the present invention, a through portion is formed in the jig member so that the sensing portion for measuring the temperature of the pouch-type battery cell is exposed to the outside. Therefore, there is an advantage that damage to the sensing portion can be prevented and the accuracy of the test results can be further improved.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Best Mode for Carrying Out the Invention

[0027] Hereinafter, based on the accompanying drawings, embodiments that enable a person having ordinary knowledge in the technical field to which the present invention pertains to easily implement the present invention will be described in detail. However, when explaining in detail the operating principle of a preferred embodiment of the present invention, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the gist of the present invention, that detailed description will be omitted.

[0028] Also, the same reference numerals are used for parts having similar functions and actions throughout the drawings. Throughout the specification, when a part is said to be connected to another part, this includes not only the case where they are directly connected, but also the case where they are indirectly connected with other elements interposed therebetween. Further, including a certain component means, unless otherwise stated to the contrary, it does not exclude other components and means that other components can be further included.

[0029] Hereinafter, with reference to the accompanying drawings, an impact test apparatus for a pouch-type battery cell according to the present invention and an impact test method for a pouch-type battery cell using the same will be described.

[0030] FIG. 2 is a perspective view showing an exploded form of an impact test apparatus for a pouch-type battery cell according to a preferred embodiment of the present invention, and FIG. 3 is a perspective view showing a form in which the impact test apparatus for a pouch-type battery cell according to a preferred embodiment of the present invention is stored.

[0031] As shown in FIGS. 2 and 3, the impact test apparatus for a pouch-type battery cell according to the present invention includes a bottom plate 100, a jig 200, and a pressing member 300.

[0032] The bottom plate 100 is for supporting the jig 200 on which the pouch-type battery cell is mounted in a fixed state, and has a flat plate shape with a predetermined thickness and width.

[0033] Here, the material of the bottom plate 100 is not particularly limited as long as it can withstand the impact of the pressing member 300 applied to the jig 200 with the pouch-type battery cell fixed, and as an example, it can be a metal material.

[0034] The jig 200 for fixing the pouch-type battery cell that requires an impact test includes a first jig member 210, a second jig member 220, and a fastening member 230.

[0035] The first jig member 210 and the second jig member 220 are located in close contact with both side surfaces of the pouch-type battery cell with the electrode leads arranged upward, and serve to fix the pouch-type battery cell.

[0036] The first jig member 210 and the second jig member 220 have the same outer shape and are composed of flat plates having a rectangular structure.

[0037] Specifically, on each of the upper side and the lower side of the first jig member 210, a first incision 211 that sinks into a predetermined area inward is provided, and a first through hole 212 that is cut open in a predetermined area is formed in the central part.

[0038] Similarly, in the case of the second jig member 220, a second incision 221 that sinks into a predetermined area inward is provided on each of the upper side and the lower side, and a second through hole 222 that is cut open in a predetermined area is formed in the central part.

[0039] During the impact test of the pouch-type battery cell, the electrode leads of the pouch-type battery cell come to be located in the first incision 211 and the second incision 221, and the pressing cylinder 320 of the pressing member 300 presses the electrode lead portion located in the incision.

[0040] Therefore, even when the pressing cylinder 320 descends and presses, the remaining portion except for the electrode lead portion is supported by the first jig member 210 and the second jig member 220, so the case of the pouch-type battery cell is not deformed.

[0041] The first through-hole 212 of the first jig member 210 and the second cut portion 221 of the second jig member 220 are for measuring the temperature change of the battery cell during the impact experiment, and the detailed description will be given later.

[0042] On the other hand, in the case of the first jig member 210 and the second jig member 220, there is no particular limitation as long as the material can fix the pouch-type battery cell and withstand the impact of the pressing member 300. As an example, it can be made of a metal material.

[0043] The fastening member 230 is for fixing the first jig member 210 and the second jig member 220 together with a pouch-type battery cell interposed therebetween.

[0044] That is, a plurality of the fastening members 230 are arranged to penetrate along the edges of the first jig member 210 and the second jig member 220. As an example, it can be composed of bolts and nuts, but it is not limited thereto.

[0045] Next, the pressing member 300 will be described. The pressing member 300 includes a flat pressing plate 310 and a pressing cylinder 320 protruding from one side surface of the pressing plate 310 to a predetermined height.

[0046] The pressing cylinder 320 is for pressing the electrode lead portion of the pouch-type battery cell with a predetermined force, and can have a hemispherical shape protruding from one side surface of the pressing plate 310 to a predetermined height.

[0047] Here, it is preferable that the diameter W1 of the pressing cylinder 320 is smaller than the width W2 of the cut portion, more specifically, the widths of the first cut portion 211 and the second cut portion 221.

[0048] When the diameter W1 of the pressing cylinder 320 is the same as or larger than the widths of the first cut portion 211 and the second cut portion 221, the pressing cylinder 320 cannot descend to the cut portion and cannot press the electrode lead portion of the pouch-type battery cell.

[0049] On one side, at the edge of the other side of the flat pressing plate 310, that is, the side opposite to the side where the pressing cylinder 320 is located, a pair of bent portions 311 that extend in a predetermined length in the vertical direction and then are bent to face each other are provided, and a storage space of a predetermined size is formed by such a pair of bent portions 311.

[0050] Such a storage space can be stored in a state where the bottom plate 100 is mounted, so when the impact test device is not used, there is an advantage that storage is advantageous.

[0051] The material of the pressing member 300 composed of the pressing plate 310 and the pressing cylinder 320 is not particularly limited, but may be the same metal material as the bottom plate 100 or the jig 200 described above.

[0052] On the other hand, during the impact test of the pouch-type battery cell, the pressing member 300 must be moved with a predetermined force. At this time, it is possible for an operator to push by hand, but for accurate measurement, it is preferable to further provide a separate driving unit (not shown) for moving the pressing member 300 up and down.

[0053] For example, the driving unit is composed of a clamp-like fixing part that can hold both side ends of the pressing plate 310, a guide rail for guiding the fixing part to move up and down, and a driving shaft for moving the fixing part downward or upward, etc., but it is not particularly limited as long as it is a means capable of moving the pressing member 300.

[0054] FIG. 4 is a perspective view showing a form in which a battery cell is mounted on the impact test device for a pouch-type battery cell of the present invention, and FIG. 5 is a front view showing a form in which a battery cell is mounted on the impact test device for a pouch-type battery cell of the present invention.

[0055] The impact test method for the pouch-type battery cell will be described with reference to FIGS. 4 and 5.

[0056] The impact test method for the pouch-type battery cell according to the present invention includes a first step of fixing the pouch-type battery cell C in a state where it is positioned between the first jig member 210 and the second jig member 220, a second step of bringing the jig 200 into close contact with one side surface of the bottom plate 100 with the pouch-type battery cell C fixed, and a third step of pressing a predetermined portion of the pouch-type battery cell C fixed to the jig 200 with the pressing member 300.

[0057] First, the first step is to position the pouch-type battery cell C to be measured between the first jig member 210 and the second jig member 220, and then fix them using the fastening member 230.

[0058] Here, the electrode lead portion of the pouch-type battery cell C is bent at approximately 80° or more, more preferably 90°, and is positioned in the first cutout portion 211 and the second cutout portion 221 so as not to protrude outside the first jig member 210 and the second jig member 220.

[0059] On the other hand, the pouch-type battery cell C includes a cell assembly, a cell case for housing the cell assembly, and a pair of leads.

[0060] The cell assembly can be composed of, but is not limited to, a jelly roll type cell assembly having a structure in which a separator is interposed between a long sheet-shaped positive electrode and a negative electrode and then wound, a stack type cell assembly composed of unit cells having a structure in which a rectangular positive electrode and a negative electrode are laminated with a separator interposed therebetween, a stack folding type cell assembly in which the unit cells are wound by a long separation film, or a lamination stack type cell assembly in which the unit cells are laminated with a separator interposed therebetween and adhered to each other.

[0061] The cell assembly as described above is incorporated in a cell case, which usually has a laminated sheet structure of an inner layer / a metal layer / an outer layer. Since the inner layer is in direct contact with the cell assembly, it must have insulation and resistance to electrolytic solution, and for sealing against the outside, that is, the sealing part where the inner layers are thermally bonded to each other must have excellent thermal bonding strength. As materials for such an inner layer, polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, which are excellent in chemical resistance and have good sealing properties, polyurethane resins, and polyimide resins can be selected, but it is not limited thereto, and polypropylene, which is excellent in mechanical physical properties such as tensile strength, rigidity, surface hardness, and impact resistance and chemical resistance, is most preferred.

[0062] The metal layer in contact with the inner layer corresponds to a barrier layer that prevents moisture and various gases from penetrating into the battery from the outside. As a suitable material for such a metal layer, an aluminum thin film that is light and has excellent moldability can be used.

[0063] And an outer layer is provided on the other side of the metal layer. Such an outer layer can use a heat-resistant polymer excellent in tensile strength, moisture permeability prevention, and air permeability prevention so as to ensure heat resistance and chemical resistance while protecting the electrode assembly. As an example, nylon or polyethylene terephthalate can be used, but it is not limited thereto. Cell On the other hand, the leads composed of the positive electrode lead and the negative electrode lead have a structure in which the positive electrode tab and the negative electrode tab of the cell assembly are electrically connected and then exposed to the outside of the case. Since the battery cell as described above corresponds to a generally known configuration, a more detailed description will be omitted.

[0064] The second step is to prepare for the impact test by bringing the pouch-type battery cell C fixed by the first jig member 210, the second jig member 220, and the fastening member 230 into close contact with one side surface of the bottom plate 100.

[0065] The second step is to prepare for the impact test by bringing the pouch-type battery cell C fixed by the first jig member 210, the second jig member 220, and the fastening member 230 into close contact with one side surface of the bottom plate 100.

[0066] Here, the bottom plate 100 is positioned parallel to the floor surface, and the pouch-type battery cell C is arranged perpendicular to the bottom plate 100. Of course, instead of the bottom plate 100 being positioned perpendicular to the bottom surface, it is also possible to arrange the pouch-type battery cell C to be parallel to the floor surface.

[0067] The third stage is the stage of pressing a predetermined part of the pouch-type battery cell C, specifically the rib part of the folded electrode.

[0068] Here, it is good to monitor the temperature change of the pouch-type battery cell C together. For this purpose, a sensing part 400 for measuring temperature can be further provided.

[0069] For example, the sensing part 400 is composed of a sensing pad 410 and a sensing cable 420. The sensing pad 410 is preferably attached to the side surface of the pouch-type battery cell C exposed by the first cut part 211 or the second cut part 221 so as not to be pressed by the jig member.

[0070] Then, one side of the sensing cable 420 penetrates through the first cut part 211 or the second cut part 221 and is then connected to the sensing pad 410, and the other side is connected to a temperature measuring device (not shown), so that the temperature change during the pressing process can be continuously measured.

[0071] Here, it is preferable to attach the sensing pad 410 and the sensing cable 420 after fixing the pouch-type battery cell C to the jig member, but it is also okay to perform the step of fixing with the jig member after attaching to the pouch-type battery cell C in advance.

[0072] On the other hand, when storing the impact test device, as described above, the bottom plate 100 can be stored in the storage space S of the pressing plate 310 for storage.

[0073] Those having ordinary knowledge in the field to which the present invention pertains will be able to make various applications and modifications within the scope of the present invention based on the above content.

Explanation of Reference Numerals

[0074] 100 Bottom plate 200 Jig 210 First jig member 211 First incision part 212 First through part 220 Second jig member 221 Second incision part 222 Second through part 230 Fastening member 300 Pressing member 310 Pressing plate 311 Bending part 320 Pressing cylinder 400 Sensing part 410 Sensing pad 420 Sensing cable C Pouch-type battery cell S Storage space W1 Diameter of the pressing cylinder W2 Width of the incision part

Claims

1. A flat bottom plate, A jig including a first jig member and a second jig member located on both sides of the pouch-type battery cell and having a square outer shape, A pressing member for pressing a predetermined portion of the pouch-type battery cell, In an impact test device for a pouch-type battery cell, including: On each of the upper side and the lower side of the first jig member, a first incision portion that sinks into a predetermined area inward is provided, On each of the upper side and the lower side of the second jig member, a second incision portion that sinks into a predetermined area inward is provided, An impact test device for a pouch-type battery cell, wherein an electrode lead portion of the pouch-type battery cell is bent at a predetermined angle and is located in the first incision portion and the second incision portion so as not to protrude outside the first jig member and the second jig member.

2. A first through portion is formed in the central portion of the first jig member, The impact test device for a pouch-type battery cell according to claim 1, wherein a second through portion is formed in the central portion of the second jig member.

3. The impact test device for a pouch-type battery cell according to claim 1, wherein a plurality of fastening members are provided at the edges of the first jig member and the second jig member to adjust and fix the distance between the first jig member and the second jig member.

4. The impact test device for a pouch-type battery cell according to claim 2, wherein the pressing member includes a flat pressing plate and a pressing cylinder protruding from one side surface of the pressing plate.

5. The impact test device for a pouch-type battery cell according to claim 4, wherein the pressing cylinder has a hemispherical shape.

6. The impact test device for a pouch-type battery cell according to claim 4, wherein a pair of bent portions are formed at both side edges of the other side surface of the pressing plate, extending in a vertical direction by a predetermined length and then bent to face each other so as to form a storage space.

7. The impact test device for a pouch-type battery cell according to claim 5, wherein the diameter of the pressing cylinder is smaller than the widths of the first incision portion and the second incision portion.

8. An impact test method for a pouch-type battery cell using the impact test device for a pouch-type battery cell according to any one of claims 1 to 7, A first step of fixing the pouch-type battery cell in a state where it is positioned between the first jig member and the second jig member, A second step of bringing the jig into close contact with one side surface of the bottom plate in a state where the pouch-type battery cell is fixed, A third step of pressing a predetermined portion of the pouch-type battery cell fixed to the jig with a pressing member; An impact test method for a pouch-type battery cell, including the above.

9. The impact test method for a pouch-type battery cell according to claim 8, further including a step of connecting a sensing portion to a side surface of the pouch-type battery cell prior to the third step.

10. The sensing portion includes a sensing pad attached to a side surface of the pouch-type battery cell and the sensing cable having one side thereof connected to the sensing pad, The impact test method for a pouch-type battery cell according to claim 9, wherein the sensing pad and the sensing cable are arranged to penetrate through the first through portion of the first jig member or the second through portion of the second jig member.

11. The impact test method for a pouch-type battery cell according to claim 8, wherein in the first step, the electrode lead of the pouch-type battery cell is bent at a predetermined angle.

12. The impact test method for a pouch-type battery cell according to claim 11, wherein the predetermined angle is 80° or more.

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