Shell structure, dry battery and button cell

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a shell structure, a dry battery and a button cell, which comprises a lower shell, a ceramic insulating layer and an upper cover plate, the lower shell is provided with a cavity with an opening in the upper portion, and the upper cover plate covers the opening in the upper end of the lower shell. The ceramic insulating layer has viscidity, and the ceramic insulating layer is bonded with the upper cover plate and the lower shell, so that the upper cover plate and the lower shell are enclosed to form a closed inner cavity for placing a battery cell; one of the upper cover plate and the lower shell is electrically connected with the positive electrode of the battery cell, and the other is electrically connected with the negative electrode of the battery cell. According to the shell structure, the dry battery and the button battery disclosed by the embodiment of the utility model, the flat-plate-shaped cover plate structure is used for replacing a combination body of a cover plate, an insulating glue layer and a pole in the prior art, and the pole is prevented from extending into and occupying part of the inner cavity of the lower shell, so that the inner cavity of the shell structure is provided for a battery cell as much as possible; and the effect of improving the battery energy is finally achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a shell structure, a dry cell and a button cell. Background Art

[0002] At present, the battery industry has increasingly higher requirements for the energy density of batteries. How to reasonably use the inner cavity of the battery is a problem faced by technical personnel in the industry.

[0003] The existing battery includes a shell structure including a cover assembly and a lower shell. The cover assembly includes a cover, an insulating layer and a pole. The cover and the lower shell are welded to form an inner cavity for the built-in battery cell. The insulating layer is arranged between the cover and the pole, and the pole and the insulating layer generally extend into the inner cavity of the battery.

[0004] The existing poles and insulating layers extend into the inner cavity of the battery, occupying the space in the battery cavity and affecting the energy density of the battery. Utility Model Content

[0005] The technical problem to be solved by the utility model is that the existing poles and insulating layers extend into the inner cavity of the battery, occupying the space in the battery cavity and affecting the energy density of the battery, and a battery shell structure is provided.

[0006] In order to solve the above technical problems, on the one hand, the embodiment of the utility model provides a housing structure.

[0007] It includes a lower shell, a ceramic insulating layer and an upper cover plate;

[0008] The lower shell has a cavity with an upper opening, and the upper cover plate covers the upper opening of the lower shell;

[0009] The ceramic insulating layer is sticky, and the ceramic insulating layer is bonded to the upper cover plate and the lower shell, so that the upper cover plate and the lower shell enclose a closed inner cavity for placing the battery cell;

[0010] One of the upper cover plate and the lower shell is electrically connected to the positive electrode of the battery cell, and the other is electrically connected to the negative electrode of the battery cell.

[0011] Optionally, a weak area is provided in the ceramic insulating layer, and the adhesive force of the weak area of ​​the ceramic insulating layer is smaller than the adhesive force of other areas of the ceramic insulating layer.

[0012] Optionally, the adhesion force of the weak area of ​​the ceramic insulating layer is 1-3 MPa, and the adhesion force of other areas of the ceramic insulating layer is at least 5 MPa.

[0013] Optionally, the upper cover plate is square, the lower shell is square barrel-shaped, the outer edge of the upper cover plate coincides with the outer edge of the upper end surface of the lower shell, and the length and width of the upper cover plate are both 5-30 mm.

[0014] Optionally, the upper cover plate is circular, the lower shell is circular barrel-shaped, the outer edge of the upper cover plate coincides with the outer edge of the upper end surface of the lower shell, and the diameter of the upper cover plate is 5-16 mm.

[0015] Optionally, the upper cover plate and the lower shell are both made of aluminum, the thickness of the upper cover plate is 0.2-0.25 mm, and the thickness of the side wall and the bottom wall of the lower shell are both 0.2-0.25 mm.

[0016] Optionally, the upper cover plate and the lower shell are both made of stainless steel, the thickness of the upper cover plate is 0.075-0.2 mm, and the thickness of the side wall and the bottom wall of the lower shell are both 0.075-0.2 mm.

[0017] Optionally, a liquid injection hole is provided on the upper cover plate or the shell.

[0018] On the other hand, an embodiment of the utility model further provides a dry cell, characterized in that it includes a battery cell and any one of the above-mentioned shell structures.

[0019] On the other hand, an embodiment of the utility model further provides a button-type battery, characterized in that it includes a battery cell and any one of the above-mentioned shell structures.

[0020] According to the shell structure, dry cell and button cell of the embodiments of the utility model, a flat cover structure is used to replace the combination of the cover, insulating rubber layer and pole in the prior art, so as to prevent the pole from extending into and occupying part of the inner cavity of the lower shell, thereby increasing the inner cavity of the shell structure to provide to the battery cell as much as possible, and finally achieving the effect of increasing the battery energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the housing structure provided by the first embodiment of the utility model;

[0022] Figure 2 It is a half-section schematic diagram of the shell structure provided by the first embodiment of the utility model.

[0023] The reference numerals in the specification are as follows:

[0024] 1. Lower shell; 2. Ceramic insulation layer; 3. Upper cover. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] First embodiment

[0027] like Figure 1 and Figure 2 As shown, an embodiment of the utility model provides a shell structure, including a lower shell 1, a ceramic insulating layer 2 and an upper cover plate 3; the lower shell 1 is provided with a cavity opening upward, and the upper cover plate 3 covers the lower shell 1; the ceramic insulating layer 2 is sticky, and the ceramic insulating layer 2 is bonded to the upper cover plate 3 and the lower shell 1 to form a closed inner cavity for placing a battery cell; one of the upper cover plate 3 and the lower shell 1 is connected to the positive electrode of the battery cell, and the other of the upper cover plate 3 and the lower shell 1 is connected to the negative electrode of the battery cell.

[0028] The upper cover plate 3 in this embodiment is in the shape of a flat plate, and the upper cover plate 3 covers the inner cavity of the lower shell 1. The upper cover plate 3 and the lower shell 1 in this embodiment are both conductive. Compared with the prior art, the cover plate assembly is composed of components such as poles, cover plates and insulating rubber layers, and the structure is simpler. In addition, there will be no cavities occupied by poles, insulating rubber layers, etc. in the inner cavity of the lower shell 1. Therefore, under the condition of the same battery height, the volume of the battery cell in this embodiment is increased and the energy density is higher than that in the prior art.

[0029] In addition, in this embodiment, a ceramic insulating layer 2 composed of a composite material composed of ceramic material and adhesive is used for insulation between the upper cover plate 3 and the lower shell 1 to provide insulation protection for the lower shell 1 and the upper cover plate 3. The upper cover plate 3 and the lower shell 1 are also bonded by the ceramic insulating layer 5, thereby killing two birds with one stone.

[0030] In this embodiment, the upper cover plate 3 is circular, the lower shell 1 is cylindrical, and the diameter of the upper cover plate 3 is 5-16 mm, wherein the outer contour of the upper cover plate 3 is the same as the outer contour of the lower shell 1, that is, the orthographic projection of the outer peripheral surface of the lower shell 1 on the upper cover plate 3 is exactly the outer peripheral surface of the upper cover plate 3. Both the upper cover plate 3 and the lower shell 1 are made of stainless steel, the upper cover plate 3 is 0.075-0.2 mm, and the thickness of the side wall and the bottom wall of the lower shell 1 are also 0.075-0.2 mm. The cylindrical lower shell 1 and the circular upper cover plate 3 of this embodiment are both the sizes of common button batteries. Because they are made of stainless steel, the thickness of the upper cover plate 3 and the lower shell 1 can be extremely thin, and combined with the minimalist design of the shell structure of this embodiment, the battery energy density is greatly improved.

[0031] In this embodiment, a weak area is provided in the ceramic insulating layer 2, and the adhesive force of the weak area of ​​the ceramic insulating layer 2 is less than the adhesive force of other areas of the ceramic insulating layer 2. Specifically, the adhesive force of the weak area of ​​the ceramic insulating layer 2 is 1-3MPa, and the adhesive force of other areas of the ceramic insulating layer 2 is at least 5MPa. Since the size of the upper cover plate 3 and the lower shell 1 in this embodiment is relatively small, the adhesive force in this embodiment is sufficient to stably bond the upper cover plate 3 and the lower shell 1, and since the ceramic insulating layer 2 is provided with a weak area, the weak area acts as a safety valve. When the internal pressure of the shell is too high, the gas breaks through the weak area and is released to the outside.

[0032] In this embodiment, a liquid injection hole is provided on the upper cover plate 3, and the electrolyte is injected into the shell structure through the liquid injection hole.

[0033] Second embodiment

[0034] The housing structure of the second embodiment of the utility model is different from that of the first embodiment in that the upper cover plate 3 and the lower housing 1 are both made of aluminum, and the thickness of the upper cover plate 3 is 0.2-0.25 mm. The thickness of the side wall and the bottom wall of the lower housing 1 are also 0.2-0.25 mm. The rigidity and strength of the aluminum material are not as good as the stainless steel material in the first embodiment, so the thickness of the upper cover plate 3 and the lower housing 1 needs to be increased.

[0035] Third embodiment

[0036] The shell structure of the third embodiment of the utility model is different from that of the first embodiment in that, optionally, the upper cover plate 3 is square, the lower shell 1 is block-shaped, the orthographic projection of the lower shell 1 on the upper cover plate 3 coincides with the outer contour line of the upper cover plate 3, and the length and width of the upper cover plate 3 are both 5-30 mm. The upper cover plate 3 in this embodiment can be square, and in other embodiments, it can also be oval or a special shape.

[0037] Fourth embodiment

[0038] The fourth embodiment of the utility model also provides a dry cell, comprising a battery cell and any of the above-mentioned shell structures; the battery cell is arranged in the inner cavity, the positive electrode of the battery cell is connected to the upper cover plate 3, and the negative electrode of the battery cell is connected to the lower shell 1. The extremely simple shell structure can be applied to dry cells.

[0039] Fifth embodiment

[0040] The fifth embodiment of the utility model also provides a button battery, comprising a battery cell and any of the above-mentioned shell structures; the battery cell is arranged in the inner cavity, the positive electrode of the battery cell is connected to the upper cover plate 3, and the negative electrode of the battery cell is connected to the lower shell 1. The extremely simple shell structure can be applied to button batteries.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A housing structure, characterized in that: It includes a lower shell, a ceramic insulating layer and an upper cover plate; The lower shell has a cavity with an upper opening, and the upper cover plate covers the upper opening of the lower shell; The ceramic insulating layer is sticky, and the ceramic insulating layer is bonded to the upper cover plate and the lower shell, so that the upper cover plate and the lower shell enclose a closed inner cavity for placing the battery cell; One of the upper cover plate and the lower shell is electrically connected to the positive electrode of the battery cell, and the other is electrically connected to the negative electrode of the battery cell.

2. The housing structure according to claim 1, characterized in that: A weak area is provided in the ceramic insulating layer, and the adhesive force of the weak area of ​​the ceramic insulating layer is smaller than the adhesive force of other areas of the ceramic insulating layer.

3. The housing structure according to claim 2, characterized in that: The adhesive force of the weak area of ​​the ceramic insulating layer is 1-3 MPa, and the adhesive force of other areas of the ceramic insulating layer is at least 5 MPa.

4. The housing structure according to claim 1, characterized in that: The upper cover plate is square, the lower shell is square barrel-shaped, the outer edge of the upper cover plate coincides with the outer edge of the upper end surface of the lower shell, and the length and width of the upper cover plate are both 5-30 mm.

5. The housing structure according to claim 1, characterized in that: The upper cover plate is circular, the lower shell is circular barrel-shaped, the outer edge of the upper cover plate coincides with the outer edge of the upper end surface of the lower shell, and the diameter of the upper cover plate is 5-16 mm.

6. The housing structure according to claim 1, characterized in that: The upper cover plate and the lower shell are both made of aluminum. The thickness of the upper cover plate is 0.2-0.25 mm, and the thickness of the side wall and the bottom wall of the lower shell are both 0.2-0.25 mm.

7. The housing structure according to claim 1, characterized in that: The upper cover plate and the lower shell are both made of stainless steel. The thickness of the upper cover plate is 0.075-0.2 mm, and the thickness of the side wall and the bottom wall of the lower shell are both 0.075-0.2 mm.

8. The housing structure according to claim 1, characterized in that: The upper cover plate is provided with a liquid injection hole.

9. A dry cell battery, characterized in that: The invention comprises a battery core and the shell structure according to any one of claims 1 to 8.

10. A button battery, characterized in that: The invention comprises a battery core and the shell structure according to any one of claims 1 to 8.

Images