Battery cell structure preventing corner breakage

Abstract

The utility model relates to the technical field of electric core, disclose a kind of electric core structure to prevent corner position breakage, including electric core main body and the wrapping piece for the electric core main body is wrapped to the electric core main body is sealed in, the inner side surface of the wrapping piece faces the electric core main body is hot-pressing composite with multiple reinforcing pieces, multiple the reinforcing piece is set in the multiple corner positions of the electric core main body one by one.Corresponding electric core main body each corner position is set reinforcing piece on the inner side surface of wrapping piece, to improve the strength of wrapping piece at each corner position, solve the problem that four corner positions of wrapping piece are easily broken when electric core main body expands outward, improve the security of electric core structure use.

Description

Technical Field

[0001] This utility model relates to the technical field of battery cells, and in particular to a battery cell structure that prevents corner breakage. Background Technology

[0002] As market demand for long-lasting lithium-ion batteries increases, manufacturers are pushing the limits of cell design, even down to the thickness of the wrapping materials (such as aluminum-plastic film). Specifically, the dimensions of the cell are being designed to their extremes, and the wrapping materials (such as aluminum-plastic film) are becoming increasingly thinner. This results in weaker corners for the wrapping materials. (See also...) Figure 1 In particular, when the package 1 is pre-punched with mold 3 to form a pit 11 (the pit 11 is used to place the battery cell body. Setting this pit 11 helps to ensure the accuracy of the battery cell body placement position, so as to prevent the problem that the package 1 cannot reliably seal the battery cell body inside after subsequent hot pressing due to the displacement of the battery cell body placement position), the thickness of the four corners 111 of the pit 11 of the package 1 is thinner than the thickness of other areas due to the stretching caused by the punching of mold 3. Therefore, the strength of the four corners 111 of the pit 11 of the package 1 is extremely weak. When the internal battery cell body expands after long-term operation and pushes the package outward, it is easy to cause the package to break at the corners, resulting in battery leakage and affecting the safety of battery use. Therefore, it is necessary to improve the existing battery cell structure.

[0003] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Utility Model Content

[0004] This utility model provides a battery cell structure to prevent corner damage, mainly solving the technical problem that the corners of the packaging (mostly aluminum-plastic film) of the existing battery cell structure are prone to damage during use due to the expansion of the internal battery cell body.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A battery cell structure for preventing corner breakage includes a battery cell body and a wrapping component for wrapping the battery cell body to seal it inside. The wrapping component has multiple reinforcing members hot-pressed onto its inner side facing the battery cell body, and the multiple reinforcing members are disposed one-to-one at multiple corners of the battery cell body.

[0007] In one of the technical solutions, the package is stamped to form at least one pit for accommodating the battery cell body, and the reinforcing member is provided at each corner of the pit.

[0008] In one of the technical solutions, multiple reinforcing members are hot-pressed onto the surface of the package before the package is stamped to form the pit, and the reinforcing members are also stamped and deformed at the same time the package is stamped to form the pit.

[0009] In one technical solution, the surface of the package before it is stamped is designated as the first surface, and the pit is recessed relative to the first surface. When the package and the reinforcing member are stamped together, the reinforcing member includes a first connecting part, a second connecting part, and a third connecting part connected in sequence. The first connecting part is hot-pressed to the first surface, the second connecting part is hot-pressed to the side wall inside the pit, and the third connecting part is hot-pressed to the bottom surface of the pit.

[0010] In one of the technical solutions, both the wrapping component and the reinforcing component are aluminum-plastic film.

[0011] In one of the technical solutions, the aluminum-plastic film comprises, from the outside in, an outer barrier layer, an aluminum foil layer, and an insulating hot-pressed layer.

[0012] The outer barrier layer of the reinforcing member is hot-pressed together with the insulating hot-pressed layer of the package, or the insulating hot-pressed layer of the reinforcing member is hot-pressed together with the insulating hot-pressed layer of the package.

[0013] In one of the technical solutions, the outer barrier layer is a nylon layer or a polyester layer, and the insulating hot-pressed layer is a polypropylene layer.

[0014] In one of the technical solutions, the thickness of the reinforcing member is 50%-75% of the thickness of the wrapping member.

[0015] In one technical solution, the reinforcing member is circular in shape, and the area of ​​the reinforcing member is 3mm². 2 -6mm 2 .

[0016] In one of the technical solutions, a hot melt adhesive layer is provided between the reinforcing member and the wrapping member.

[0017] Compared with the prior art, the cell structure for preventing corner breakage provided by this utility model has at least the following beneficial effects:

[0018] This solution, while ensuring the battery cell structure has a good energy density by not making the package too thick, improves the strength of the package at each corner by setting reinforcements on the inner side of the package and at each corner of the battery cell body. This solves the problem that the four corners of the package are easily damaged when the battery cell body expands outward, and improves the safety of the battery cell structure. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure in which the indentation is formed on an existing package under the stamping of a mold;

[0021] Figure 2 This is a schematic diagram of a cell structure for preventing corner breakage, provided in an embodiment of this application.

[0022] Figure 3 A schematic diagram of the structure of the reinforcing member provided in the embodiments of this application when it is hot-pressed onto the package;

[0023] Figure 4 A schematic diagram of the structure of a package after the indentation is formed by stamping, as provided in an embodiment of this application;

[0024] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0025] Figure 6 This is a schematic diagram of the structure of the battery cell body after it has been placed into the slot of the package, as provided in an embodiment of this application.

[0026] Figure label:

[0027] 1. Package; 11. Pit; 111. Corner; 12. First surface; 2. Battery cell body; 3. Mold; 4. Reinforcing part; 41. First connecting part; 42. Second connecting part; 43. Third connecting part; 5. Positive tab; 6. Negative tab. Detailed Implementation

[0028] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0029] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0030] It should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0033] Please refer to the following: Figures 2 to 6 This utility model provides a battery cell structure to prevent corner breakage. The battery cell structure mainly includes a wrapping component 1 and a battery cell body 2. The wrapping component 1 is used to wrap and seal the battery cell body 2, preventing electrolyte leakage. Currently, most wrapping components 1 are made of aluminum-plastic film. Furthermore, multiple reinforcing members 4 are hot-pressed onto the inner side of the wrapping component 1 facing the battery cell body 2. These reinforcing members 4 are correspondingly positioned at multiple corners of the battery cell body 2. Specifically, this solution, while ensuring the wrapping component 1 is not too thick to achieve optimal energy density, improves the strength of the wrapping component 1 at each corner by providing reinforcing members 4 on the inner side of the wrapping component 1 corresponding to each corner of the battery cell body 2. This solves the problem of easy breakage at the four corners of the wrapping component 1 due to outward expansion of the battery cell body 2, thus improving the safety of the battery cell structure.

[0034] Please refer to the following: Figures 4 to 6In this embodiment, the package 1 is preferably formed by stamping with at least one indentation 11. This indentation 11 is used to place the battery cell body 2. Setting this indentation 11 helps to ensure the accuracy of the placement of the battery cell body 2, preventing the problem that the package 1 cannot reliably seal the battery cell body 2 after subsequent hot pressing due to the misalignment of the battery cell body 2's placement position. Based on the structural design of the package 1 with pre-set indentations 11, the aforementioned reinforcing member 4 is equivalent to need to be set at each corner of the indentation 11 to strengthen the strength of each corner of the indentation 11, thereby solving the problem that the four corners of the package 1 are easily damaged. It should be added that the package 1 can be pre-stamped to form two indentations 11. During the hot pressing and sealing process of the battery cell body 2, the battery cell body 2 can be placed in one of the indentations 11 in advance, and then the two indentations 11 can be aligned and used to wrap the battery cell body 2. Finally, the package 1 is hot-pressed and sealed. The area of ​​hot pressing and sealing is actually the outer ring of the battery cell body 2. Please refer to Figure 2 In fact, when the package 1 is hot-pressed to seal the battery cell body 2, the package will also wrap part of the positive electrode 5 and the negative electrode 6. The positive electrode 5 and the negative electrode 6 are electrically connected to the battery cell body 2 respectively. Parts of the positive electrode 5 and the negative electrode 6 are exposed to the outside, so as to bring out the positive and negative electrodes inside the battery cell body 2, thereby enabling the battery cell body 2 to charge internally or discharge externally.

[0035] Please see Figure 3 In this preferred design, multiple reinforcing members 4 are hot-pressed onto the surface of the package 1 before the indentation 11 is formed during stamping. The specific hot-pressing temperature is 185℃, and the hot-pressing time is 1-6 seconds. Furthermore, the reinforcing members 4 are also stamped and deformed simultaneously with the indentation 11 formed during stamping of the package 1. This design ensures that when the package 1 and the reinforcing members 4 are... Figure 4After being stamped together, each corner of the pit 11 can be provided with a reinforcing member 4, which reduces the manufacturing difficulty of setting the reinforcing member 4 on the pit 11 and simplifies the production process so that the purpose of having a reinforcing member 4 at each corner of the pit 11 can be achieved in a low-cost manner. In addition, after the reinforcing member 4 and the wrapping member 1 are hot-pressed together, it is preferable to drip hot melt adhesive onto the periphery of the reinforcing member 4, and before the hot melt adhesive solidifies, the reinforcing member 4 is hot-pressed again to flatten it, so as to prevent the hot melt adhesive from causing excessive thickness. After the hot melt adhesive solidifies, it is equivalent to a hot melt adhesive layer between the reinforcing member 4 and the wrapping member 1. This hot melt adhesive layer can not only improve the connection strength between the reinforcing member 4 and the wrapping member 1, so that when the wrapping member 1 and the reinforcing member 4 are jointly stamped to form the pit 11, it ensures that the reinforcing member 4 will not shift relative to the wrapping member 1, and improves the reliability of the corner wrapping of the reinforcing member 4 to the pit 11. Moreover, this hot melt adhesive layer further improves the corner strength of the wrapping member 1, thereby further preventing the corner of the wrapping member 1 from being damaged, and further improving the safety of the battery cell structure.

[0036] Please refer to the following: Figure 4 and Figure 5 Let the surface of the package 1 before stamping be the first surface 12, and the recess 11 be concave relative to the first surface 12. After the package 1 and the reinforcing member 4 are stamped together, the reinforcing member 4 is deformed into a first connecting part 41, a second connecting part 42, and a third connecting part 43 that are bent and connected in sequence. The first connecting part 41 is hot-pressed to the first surface 12, the second connecting part 42 is hot-pressed to the side wall inside the recess 11, and the third connecting part 43 is hot-pressed to the bottom surface of the recess 11. Through this design, it is ensured that the reinforcing member 4 completely covers the corner of the recess 11, thereby greatly improving the strength of the corner of the recess 11 and more reliably preventing the four corners of the package 1 from breaking when the battery cell body 2 expands.

[0037] In this embodiment, the reinforcing member 4 and the wrapping member 1 are preferably both aluminum-plastic films. In fact, the aluminum-plastic film includes an outer barrier layer, an aluminum foil layer, and an insulating hot-pressed layer arranged sequentially from the outside in. The outer barrier layer is mostly made of nylon (NY) or polyethylene terephthalate (PET). The function of the outer barrier layer is to protect the middle aluminum foil layer from mechanical scratches or punctures, while also reducing external impacts, blocking oxygen penetration, and maintaining the deformation capacity of the aluminum foil layer. The aluminum foil layer is mostly 35-40μm thick, and its core function is to act as a shielding layer, allowing the metal... The oxide film formed by the reaction of aluminum and oxygen prevents moisture from penetrating into the battery cell body 2. The aluminum foil layer also provides structural rigidity to support the entire package 1, allowing it to be stamped to form the pits 11. The insulating hot-pressed layer is mostly made of cast polypropylene (CPP) or modified polypropylene (PP). The insulating hot-pressed layer has the characteristics of being resistant to electrolyte corrosion to prevent electrolyte from contacting the aluminum foil layer. At the same time, it has the characteristics of being able to melt at high temperatures to seal the outer edges around the battery cell body 2, thereby preventing gas expansion or leakage. The insulating hot-pressed layer also has high insulation and puncture resistance. More specifically, when the reinforcing member 4 and the package 1 are hot-pressed together, the outer resistance layer of the reinforcing member 4 can be hot-pressed together with the insulating hot-pressed layer of the package 1, or the insulating hot-pressed layer of the reinforcing member 4 can be hot-pressed together with the insulating hot-pressed layer of the package 1.

[0038] In this embodiment, the reinforcing member 4 is preferably a small circular piece with a circular shape, and the area of ​​the reinforcing member 4 is preferably 3 mm². 2 -6mm 2 This ensures that the corner of the pit 11 is completely covered. In addition, the thickness of the reinforcing member 4 is preferably 50%-75% of the thickness of the wrapping member 1. This ensures the strength of the reinforcement and prevents the corner from wrinkling severely when the pit 11 is formed due to excessive thickness of the reinforcement. This ensures that the corner of the wrapping member 1 has high strength after reinforcement.

[0039] The above are merely preferred embodiments of the present utility model, and only specifically describe the technical principles of the present utility model. These descriptions are only for explaining the principles of the present utility model and should not be construed as limiting the scope of protection of the present utility model in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model, as well as other specific embodiments of the present utility model that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present utility model.

Claims

1. A cell structure for preventing corner breakage, characterized in that, The device includes a battery cell body and a wrapping component for enclosing the battery cell body to seal it inside. The wrapping component has multiple reinforcing members hot-pressed onto its inner side facing the battery cell body. The multiple reinforcing members are correspondingly disposed at multiple corners of the battery cell body.

2. The electrode structure according to claim 1, wherein The package is stamped to form at least one recess for accommodating the battery cell body, and the reinforcing member is provided at each corner of the recess.

3. The electrode structure according to claim 2, wherein The reinforcing members were hot-pressed onto the surface of the package before the indentation was formed by stamping, and the reinforcing members were also stamped and deformed at the same time the indentation was formed by stamping.

4. The electrode structure according to claim 3, wherein Let the surface of the package before it is stamped be the first surface, and the pit is recessed relative to the first surface. When the package and the reinforcing member are stamped together, the reinforcing member includes a first connecting part, a second connecting part and a third connecting part connected in sequence. The first connecting part is hot-pressed to the first surface, the second connecting part is hot-pressed to the side wall inside the pit, and the third connecting part is hot-pressed to the bottom surface of the pit.

5. The electrode structure according to claim 1, wherein Both the package and the reinforcing member are made of aluminum-plastic film.

6. The electrode structure according to claim 5, wherein The aluminum-plastic film includes an outer barrier layer, an aluminum foil layer, and an insulating hot-pressed layer arranged sequentially from the outside to the inside. The outer barrier layer of the reinforcing member is hot-pressed together with the insulating hot-pressed layer of the package, or the insulating hot-pressed layer of the reinforcing member is hot-pressed together with the insulating hot-pressed layer of the package.

7. The electrode structure according to claim 6, wherein The outer barrier layer is a nylon layer or a polyester layer, and the insulating hot-pressed layer is a polypropylene layer.

8. The electrode structure according to claim 1, wherein The thickness of the reinforcing member is 50%-75% of the thickness of the package.

9. The electrode structure according to claim 1, wherein The reinforcing member has a circular shape and an area of 3 mm 2 - 6 mm 2 .

10. The cell structure for preventing corner breakage as described in claim 1, characterized in that, A hot melt adhesive layer is provided between the reinforcing member and the wrapping member.

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