Lithium-manganese button type primary battery

Abstract

The utility model discloses a lithium manganese button type primary battery which comprises a shell and a battery core assembly arranged in the shell, the shell comprises an upper layer aluminum plastic film and a lower layer aluminum plastic film which are attached to each other, and at least one of the upper layer aluminum plastic film and the lower layer aluminum plastic film is provided with a groove. The battery cell assembly is placed in the groove and is sealed by the upper-layer aluminum plastic film and the lower-layer aluminum plastic film; wherein at least one of the upper-layer aluminum-plastic film and the lower-layer aluminum-plastic film is an aluminum composite film, and the aluminum composite film comprises an aluminum middle layer, an outer corrosion-resistant insulating layer and an inner corrosion-resistant insulating layer, and the outer corrosion-resistant insulating layer and the inner corrosion-resistant insulating layer are attached to the inner side and the outer side of the aluminum middle layer respectively. The utility model has the advantages of compact structure and convenient assembly.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and in particular relates to a lithium-manganese button-type primary battery. Background Art

[0002] With the development and progress of society, electronic products are becoming more and more abundant, and these products cannot be separated from batteries. Among them, lithium-manganese button primary batteries are increasingly used, and the outer shells of such batteries usually use steel shells as the positive and negative electrode shells of the batteries. For example, Chinese patent document 202322012534.3 discloses a steel shell soft-pack polymer lithium-ion battery with a charging port, and another example is a battery assembly and lithium-ion battery disclosed in Chinese patent document 202022713144.5, which includes a soft-pack battery cell, a steel shell, and a sealing cover.

[0003] A large number of batteries require a large amount of steel, and the battery shell also needs to be stamped into a shell, and then cleaned and pre-treated before the battery assembly process can be carried out. This process requires a lot of manpower and material resources. In addition, the use of steel consumes a lot of energy. Therefore, the existing technology needs to be further improved. Utility Model Content

[0004] In order to at least partially solve the deficiencies in the prior art, the main purpose of the utility model is to provide a lithium manganese button primary battery, which has the advantages of compact structure and convenient assembly.

[0005] In order to achieve the above main purpose, the utility model provides a lithium manganese button type primary battery, comprising a shell and a battery cell assembly arranged inside the shell, the shell comprising an upper aluminum-plastic film and a lower aluminum-plastic film that are bonded to each other, at least one of the upper aluminum-plastic film and the lower aluminum-plastic film is provided with a groove, the battery cell assembly is placed in the groove and is enclosed by the upper aluminum-plastic film and the lower aluminum-plastic film; wherein at least one of the upper aluminum-plastic film and the lower aluminum-plastic film is an aluminum composite film, the aluminum composite film comprising an aluminum intermediate layer and an outer corrosion-resistant insulating layer and an inner corrosion-resistant insulating layer attached to the inner and outer sides of the aluminum intermediate layer.

[0006] According to a specific implementation of the utility model, the sum of the thickness of the outer corrosion-resistant insulating layer and the inner corrosion-resistant insulating layer is set to not exceed 60% of the total thickness of the aluminum composite film.

[0007] Furthermore, the thickness of the outer corrosion-resistant insulating layer is set to not exceed 50% of the thickness of the aluminum intermediate layer; the thickness of the inner corrosion-resistant insulating layer is set to not exceed 50% of the thickness of the aluminum intermediate layer; wherein the thickness of the outer corrosion-resistant insulating layer is the same as or different from the thickness of the inner corrosion-resistant insulating layer.

[0008] According to a specific implementation of the present invention, the aluminum intermediate layer is a pure aluminum intermediate layer or an aluminum alloy intermediate layer.

[0009] According to a specific implementation of the utility model, the outer corrosion-resistant insulating layer is a polyethylene layer, a polypropylene layer or a polymer resin layer; the inner corrosion-resistant insulating layer is a polyethylene layer, a polypropylene layer or a polymer resin layer.

[0010] According to a specific embodiment of the utility model, the battery cell assembly includes a negative electrode cake, a diaphragm, a positive electrode cake and an electrolyte, the diaphragm is located between the negative electrode cake and the positive electrode cake, and the electrolyte is filled in the groove; wherein, the negative electrode cake is connected to a negative electrode lead-out conductive sheet, and the positive electrode cake is connected to a positive electrode lead-out conductive sheet, and the negative electrode lead-out conductive sheet and the positive electrode lead-out conductive sheet are led out from the bonding point of the upper aluminum-plastic film and the lower aluminum-plastic film.

[0011] Furthermore, insulating glue is provided at the joint of the upper aluminum-plastic film and the lower aluminum-plastic film, and the negative electrode lead-out conductive sheet and the positive electrode lead-out conductive sheet pass through the inside of the insulating glue.

[0012] According to a specific implementation of the utility model, the led-out negative electrode lead-out conductive sheet is bent and formed on the end surface of the upper aluminum-plastic film, and the led-out positive electrode lead-out conductive sheet is bent and formed on the end surface of the lower aluminum-plastic film.

[0013] According to a specific embodiment of the utility model, it also includes a negative electrode metal cap and a positive electrode metal cap; the negative electrode metal cap is arranged on the end surface of the upper aluminum-plastic film and connected to the negative electrode lead-out conductive sheet, and the positive electrode metal cap is arranged on the end surface of the lower aluminum-plastic film and connected to the positive electrode lead-out conductive sheet.

[0014] According to a specific embodiment of the utility model, it also includes an outer protective insulating shell, which is arranged outside the shell and presses the negative electrode metal cap and the positive electrode metal cap respectively.

[0015] The utility model has the following beneficial effects: providing a lithium manganese button type primary battery, in which at least one of the upper aluminum-plastic film and the lower aluminum-plastic film is an aluminum composite film, and the use of the aluminum composite film is used to reduce the use of steel, and further optimize the battery structure and production process links, with the advantages of compact structure and convenient assembly, and at the same time it is also conducive to achieving energy conservation and emission reduction and reducing costs.

[0016] The aluminum composite film in the utility model comprises an aluminum middle layer and an outer corrosion-resistant insulating layer and an inner corrosion-resistant insulating layer attached to the inner and outer sides of the aluminum middle layer; wherein, the inner and outer surfaces of the aluminum composite film are both non-conductive, and the outer corrosion-resistant insulating layer and the inner corrosion-resistant insulating layer both have good corrosion resistance, and have the advantage of strong practicality.

[0017] In order to more clearly illustrate the purpose, technical solutions and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an internal structure diagram of the lithium manganese button-type primary battery embodiment 1 of the present utility model;

[0019] Figure 2 is an exploded view of the housing;

[0020] Figure 3 This is an external structure diagram of the lithium manganese button-type primary battery embodiment 1 of the present utility model;

[0021] Figure 4 This is a packaging structure diagram of the lithium manganese button-type primary battery embodiment 1 of the present utility model;

[0022] Figure 5 It is a structural diagram of Example 2 of the lithium-manganese button-type primary battery of the present utility model. DETAILED DESCRIPTION

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0024] The lithium manganese button primary battery of Example 1 is as follows Figure 1 As shown, it includes a shell and a battery cell assembly, and the battery cell assembly is arranged inside the shell; wherein the shell includes an upper aluminum-plastic film 1 and a lower aluminum-plastic film 2, and the upper aluminum-plastic film 1 and the lower aluminum-plastic film 2 are bonded together; specifically, the upper aluminum-plastic film 1 is provided with an upper groove 3, and the lower aluminum-plastic film 2 is provided with a lower groove 4, and the groove depths of the upper groove 3 and the lower groove 4 can be the same or different; wherein the upper groove 3 and the lower groove 4 correspond to each other and form an accommodating space between the upper groove 3 and the lower groove 4 when the upper aluminum-plastic film 1 and the lower aluminum-plastic film 2 are bonded, and the battery cell assembly is placed in the groove and is enclosed by the upper aluminum-plastic film 1 and the lower aluminum-plastic film 2.

[0025] like Figure 2 As shown, both the upper aluminum-plastic film 1 and the lower aluminum-plastic film 2 are aluminum composite films, and the upper aluminum-plastic film 1 is taken as an example for description as follows. The aluminum composite film includes an aluminum intermediate layer 101 and an outer corrosion-resistant insulating layer 102 and an inner corrosion-resistant insulating layer 103 attached to the inner and outer sides of the aluminum intermediate layer 101. During production, an aluminum composite film sheet with a thickness of, for example, 0.03 mm to 0.20 mm is punched through a concave die to form an upper groove 3 or a lower groove 4; preferably, the thickness of the upper aluminum-plastic film 1 and the lower aluminum-plastic film 2 is preferably the same, and exemplary, the thickness of the two is, for example, 0.10 mm.

[0026] Please continue reading Figure 2, the sum of the thickness of the outer corrosion-resistant insulating layer 102 and the inner corrosion-resistant insulating layer 103 is set to not exceed 60% of the total thickness of the aluminum composite film. Further, the thickness of the outer corrosion-resistant insulating layer 102 is set to not exceed 50% of the thickness of the aluminum intermediate layer 101; the thickness of the inner corrosion-resistant insulating layer 103 is set to not exceed 50% of the thickness of the aluminum intermediate layer 101; preferably, the thickness of the outer corrosion-resistant insulating layer 102 is the same as or different from the thickness of the inner corrosion-resistant insulating layer 103.

[0027] Among them, the aluminum intermediate layer 101 is a pure aluminum intermediate layer or an aluminum alloy intermediate layer, the outer corrosion-resistant insulating layer 102 is a polyethylene (PE) layer, a polypropylene (PP) layer or a polymer resin layer; the inner corrosion-resistant insulating layer 103 is a polyethylene (PE) layer, a polypropylene (PP) layer or a polymer resin layer.

[0028] Please continue reading Figure 1 The battery cell assembly includes a negative electrode cake 5, a separator 6, a positive electrode cake 7 and an electrolyte 8. The separator 6 is located between the negative electrode cake 5 and the positive electrode cake 7. The electrolyte 8 is filled in the solute space (upper groove 3 and lower groove 4). Among them, a negative electrode lead-out conductive sheet 501 is connected to the negative electrode cake 5, and a positive electrode lead-out conductive sheet 701 is connected to the positive electrode cake 7. The negative electrode lead-out conductive sheet 501 and the positive electrode lead-out conductive sheet 701 are led out from the joint of the upper aluminum-plastic film 1 and the lower aluminum-plastic film 2. Furthermore, an insulating glue 9 is provided at the joint of the upper aluminum-plastic film 1 and the lower aluminum-plastic film 2, and the negative electrode lead-out conductive sheet 501 and the positive electrode lead-out conductive sheet 701 pass through the inside of the insulating glue 9.

[0029] The lead-out negative electrode lead-out conductive sheet 501 is preferably bent upward to form the end surface of the upper aluminum-plastic film 1, and the lead-out positive electrode lead-out conductive sheet 701 is preferably bent downward to form the end surface of the lower aluminum-plastic film 2, so as to form Figure 3 The battery body A shown. In this embodiment, the lead-out direction of the negative lead-out conductive sheet 501 and the lead-out direction of the positive lead-out conductive sheet 701 are preferably opposite, that is, they are led out in the opposite direction; in an optional embodiment, there may also be a certain angle between the lead-out direction of the negative lead-out conductive sheet 501 and the lead-out direction of the positive lead-out conductive sheet 701, such as 90°, etc., which will not be elaborated here one by one.

[0030] In other embodiments, for example Figure 5 In the embodiment 2 shown, the upper aluminum-plastic film 1 is preferably in the form of a thin sheet, and the lower aluminum-plastic film 2 is provided with a lower groove 4, and the accommodation space is provided only by the lower groove 4; similarly, the battery cell assembly is placed in the groove and is enclosed by the upper aluminum-plastic film 1 and the lower aluminum-plastic film 2. Under this structure, the lead-out negative electrode lead-out conductive sheet 501 is preferably directly bent and formed on the end face of the upper aluminum-plastic film 1, and the lead-out positive electrode lead-out conductive sheet 701 is preferably directly bent and formed on the end face of the lower aluminum-plastic film 2.

[0031] As an extension of Example 1, Figure 4 As shown, the lithium manganese button primary battery also includes a negative electrode metal cap 10, a positive electrode metal cap 11 and an outer protective insulating shell 12; wherein, the negative electrode metal cap 10 is arranged on the end surface of the upper aluminum-plastic film 1 and is connected to the negative electrode lead-out conductive sheet 501, the positive electrode metal cap 11 is arranged on the end surface of the lower aluminum-plastic film 2 and is connected to the positive electrode lead-out conductive sheet 701, and the outer protective insulating shell 12 is arranged on the outside of the shell and respectively compresses the negative electrode metal cap 10 and the positive electrode metal cap 11. Specifically, the outer protective insulating shell 12 is preferably a cold injection molding insulating glue, and the positive electrode metal cap 11 and the negative electrode metal cap 10 are partially sealed by cold injection molding to form a regular battery structure.

[0032] Although the present invention is described above through embodiments, it should be understood that the above embodiments are only used to exemplarily describe the feasible implementation methods of the present invention, and should not be interpreted as limiting the scope of protection of the present invention. That is, any replacement or change made by those skilled in the art in accordance with the present invention should also be covered by the scope of protection of the claims of the present invention.

Claims

1. A lithium manganese button primary battery, comprising a shell and a battery cell assembly arranged inside the shell, wherein the shell comprises an upper aluminum-plastic film and a lower aluminum-plastic film that are attached to each other, at least one of the upper aluminum-plastic film and the lower aluminum-plastic film is provided with a groove, and the battery cell assembly is placed in the groove and is enclosed by the upper aluminum-plastic film and the lower aluminum-plastic film; wherein: At least one of the upper aluminum-plastic film and the lower aluminum-plastic film is an aluminum composite film, which includes an aluminum intermediate layer and an outer corrosion-resistant insulating layer and an inner corrosion-resistant insulating layer attached to inner and outer sides of the aluminum intermediate layer.

2. The lithium manganese button primary battery according to claim 1, characterized in that: The sum of the thickness of the outer corrosion-resistant insulating layer and the inner corrosion-resistant insulating layer is set to not exceed 60% of the total thickness of the aluminum composite film.

3. The lithium manganese button primary battery according to claim 2, characterized in that: The thickness of the outer corrosion-resistant insulating layer is set to be no more than 50% of the thickness of the aluminum intermediate layer; the thickness of the inner corrosion-resistant insulating layer is set to be no more than 50% of the thickness of the aluminum intermediate layer; wherein the thickness of the outer corrosion-resistant insulating layer is the same as or different from the thickness of the inner corrosion-resistant insulating layer.

4. The lithium manganese button primary battery according to claim 1, characterized in that: The aluminum intermediate layer is a pure aluminum intermediate layer or an aluminum alloy intermediate layer.

5. The lithium manganese button primary battery according to claim 1, characterized in that: The outer corrosion-resistant insulating layer is a polyethylene layer, a polypropylene layer or a polymer resin layer; the inner corrosion-resistant insulating layer is a polyethylene layer, a polypropylene layer or a polymer resin layer.

6. The lithium manganese button primary battery according to claim 1, characterized in that: The battery cell assembly includes a negative electrode cake, a separator, a positive electrode cake and an electrolyte, wherein the separator is located between the negative electrode cake and the positive electrode cake, and the electrolyte is filled in the groove; wherein the negative electrode cake is connected to a negative electrode lead-out conductive sheet, and the positive electrode cake is connected to a positive electrode lead-out conductive sheet, and the negative electrode lead-out conductive sheet and the positive electrode lead-out conductive sheet are led out from the bonding point of the upper aluminum-plastic film and the lower aluminum-plastic film.

7. The lithium manganese button primary battery according to claim 6, characterized in that: Insulating glue is provided at the joint of the upper aluminum-plastic film and the lower aluminum-plastic film, and the negative electrode lead-out conductive sheet and the positive electrode lead-out conductive sheet pass through the inside of the insulating glue.

8. The lithium manganese button primary battery according to claim 6, characterized in that: The lead-out negative electrode lead-out conductive sheet is bent and formed on the end surface of the upper aluminum-plastic film, and the lead-out positive electrode lead-out conductive sheet is bent and formed on the end surface of the lower aluminum-plastic film.

9. The lithium manganese button primary battery according to claim 8, characterized in that: It also includes a negative electrode metal cap and a positive electrode metal cap; the negative electrode metal cap is arranged on the end surface of the upper aluminum-plastic film and connected to the negative electrode lead-out conductive sheet, and the positive electrode metal cap is arranged on the end surface of the lower aluminum-plastic film and connected to the positive electrode lead-out conductive sheet.

10. The lithium manganese button primary battery according to claim 9, characterized in that: It also includes an outer protective insulating shell, which is arranged outside the shell and presses the negative electrode metal cap and the positive electrode metal cap respectively.

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