Shell assembly and battery thereof

Abstract

In order to solve the problems that a shell and a cover plate of an existing button cell adopt a laser welding process, the cost is high, and liquid leakage of the cell is easy to occur, the utility model provides a shell assembly and a cell thereof. The shell assembly comprises a first shell, a second shell and an insulation sealing layer, the first shell and the second shell are each provided with an opening, the end, close to the opening, of the first shell is provided with a first thread, the end, close to the opening, of the second shell is provided with a second thread, and the insulation sealing layer is arranged between the first thread and the second thread. And the first shell and the second shell are in insulated sealing connection through the first thread and the second thread. According to the shell assembly, the cover plate and the shell do not need to be subjected to laser welding, the size precision of the shell cover is reduced, the production cost is reduced, the production efficiency is improved, and compared with a traditional shell cover laser welding mode, the sealing performance is more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a shell component and a battery thereof. Background Art

[0002] Lithium-ion batteries are widely used in power and energy storage fields due to their high energy density, long cycle life, low self-discharge, and high charge and discharge rate. Button batteries are mostly used in portable electronic products and smart wearable electronic products due to their small size. The shell of the button battery is made of steel, and most of them are sealed by laser welding of the shell and the cover to prevent battery leakage. The shell and the cover are sealed by laser welding. This method requires high dimensional accuracy of the shell and the cover, and the processing of the shell and the cover is difficult. The laser welding process is also relatively complicated. The cost of the button battery produced is high, and the welding quality is difficult to guarantee, which is prone to battery leakage. Utility Model Content

[0003] The technical problem to be solved by the utility model is that the shell and cover of the existing button battery are welded by laser welding, which is costly and prone to battery leakage. The present application provides a shell assembly and a battery thereof.

[0004] The present application provides a shell assembly, including a first shell, a second shell and an insulating sealing layer, the first shell and the second shell are both provided with openings, the first shell is provided with a first thread at one end close to the opening, the second shell is provided with a second thread at one end close to the opening, the insulating sealing layer is provided between the first thread and the second thread, and the first shell and the second shell are connected in an insulating and sealing manner through the first thread and the second thread.

[0005] Preferably, both sides of one end of the first shell near the opening are provided with first threads, and both sides of one end of the second shell near the opening are provided with second threads, and the two first threads are arranged between the two second threads;

[0006] Or the two second threads are arranged between the two first threads.

[0007] Preferably, the thread length of the first thread is 2 to 5 mm, and the thread length of the second thread is 2 to 5 mm.

[0008] Preferably, the thread width of the first thread is 0.5-2 mm, and the thread width of the second thread is 0.5-2 mm.

[0009] Preferably, the thickness of the insulating sealing layer is 0.1-1 mm.

[0010] Preferably, the insulating sealing layer is an elastic layer, and the insulating sealing layer fits the first thread or the second thread;

[0011] Alternatively, a third thread is provided on the side of the insulating sealing layer facing the first thread, and the third thread is threadedly connected to the first thread; a fourth thread is provided on the side of the insulating sealing layer facing the second thread, and the fourth thread is threadedly connected to the second thread.

[0012] Preferably, the outer diameter a of the first shell is 6 to 14 mm, and the outer diameter b of the second shell is 6 to 14 mm;

[0013] The heights of the first shell and the second shell are both 3-8 mm.

[0014] Preferably, a is greater than b, and 0.5 mm ≤ ab ≤ 3 mm.

[0015] Preferably, a is smaller than b, and 0.5 mm ≤ ba ≤ 3 mm.

[0016] In a second aspect, the present application provides a battery, comprising the housing assembly described above.

[0017] Preferably, the battery includes a pole core, the first shell and the second shell are arranged to form a accommodating cavity, and the pole core is arranged in the accommodating cavity; the pole core also includes a first pole ear and a second pole ear, the first pole ear is welded to the side of the first shell facing the pole core, and the second pole ear is welded to the side of the second shell facing the pole core.

[0018] Beneficial effects:

[0019] When the shell assembly provided by the present application is used as a battery shell, the first thread and the second thread are directly connected during the shell assembly to achieve the function of connecting the first shell and the second shell. There is no need to laser weld the cover plate and the shell, which reduces the dimensional accuracy of the shell cover and reduces the production cost. At the same time, an insulating sealing layer is arranged between the first thread and the second thread to play the role of insulating and sealing connection between the first shell and the second shell. The shell assembly provided by the present application simplifies the sealing method of steel shell button battery assembly and improves production efficiency. Compared with the traditional shell cover laser welding method, the sealing performance is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a battery structure of an embodiment provided in the present application.

[0021] Among them, 1, the first shell; 101, the first thread; 2, the second shell; 201, the second thread; 3, the insulating sealing layer; 4, the pole core; 401, the first pole ear; 402, the second pole ear. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of 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.

[0023] In order to illustrate the technical solution of the present utility model, specific embodiments are provided below for illustration.

[0024] On the one hand, if Figure 1 As shown, an embodiment of the present application provides a housing assembly, including a first shell 1, a second shell 2 and an insulating sealing layer 3, the first shell 1 and the second shell 2 are both provided with openings, the first shell 1 is provided with a first thread 101 at one end close to the opening, the second shell 2 is provided with a second thread 201 at one end close to the opening, the insulating sealing layer 3 is provided between the first thread 101 and the second thread 201, and the first shell 1 and the second shell 2 are insulated and sealed via the first thread 101 and the second thread 201.

[0025] Specifically, the structure of the shell assembly is a structure formed by assembling the first shell 1 and the second shell 2 together. The first shell 1 and the second shell 2 are both provided with openings, and the first shell 1 is provided with a first thread 101 at one end close to the opening, and the second shell 2 is provided with a second thread 201 at one end close to the opening. The first thread 101 and the second thread 201 are threadedly connected to each other so as to assemble and connect the first shell 1 and the second shell 2 together to form a shell assembly. An insulating sealing layer 3 is provided between the first thread 101 and the second thread 201, and the first thread 101 and the second thread 201 are connected through the insulating sealing layer 3. The insulating sealing layer 3 serves to separate the first shell 1 and the second shell 2 to prevent the battery from short-circuiting. At the same time, the insulating sealing layer 3 can be filled into the matching gap between the first thread 101 and the second thread 201 to prevent moisture and oxygen in the air from entering the battery cell.

[0026] The setting position of the first thread 101 of the present application has at least the following two structures: the first structure is that the first shell 1 has a bottom wall and two side walls, the first shell 1 has no top wall, the first thread 101 is set on both side walls of the first shell 1, and the first thread 101 is located at the end of the side wall away from the bottom wall; the second structure is that the first shell 1 has a bottom wall, two side walls and a top wall, and an opening penetrating the top wall is set on the top wall, then the first thread 101 can be set on the two side walls and face the direction of the opening, and the first thread 101 can also be set on the top wall and on both sides of the opening.

[0027] The setting position of the second thread 201 of the present application also has at least two structures, which are the same as the structure of the first shell 1.

[0028] It should be noted that the present application does not limit the shape of the opening, for example, the cross-sectional shape of the opening may be a square, a circle, an ellipse, a polygon, or a figure composed of straight lines and curves. Figure 1 The cross-sectional shape of the opening shown is square. The housing of the present application is preferably cylindrical.

[0029] When the shell assembly provided in the present application is used as a battery shell, the first thread 101 and the second thread 201 are directly connected during the shell assembly to achieve the connection between the first shell 1 and the second shell 2. There is no need to laser weld the cover plate and the shell, which reduces the dimensional accuracy of the shell cover and reduces the production cost. At the same time, an insulating sealing layer 3 is arranged between the first thread 101 and the second thread 201 to achieve the function of insulating and sealing the first shell 1 and the second shell 2. The shell assembly provided in the present application simplifies the sealing method of steel shell button battery assembly and improves production efficiency. Compared with the traditional shell cover laser welding method, the sealing performance is more reliable.

[0030] In some embodiments, first threads 101 are disposed on both sides of one end of the first shell 1 close to the opening, second threads 201 are disposed on both sides of one end of the second shell 2 close to the opening, and two first threads 101 are disposed between two second threads 201;

[0031] Or the two second threads 201 are both arranged between the two first threads 101 .

[0032] Specifically, first threads 101 are provided on both sides of one end of the first shell 1 close to the opening.

[0033] The two first threads 101 are both arranged between the two second threads 201, which means that in the first direction, the width of the first shell 1 is smaller than the width of the second shell 2. When the outer shell assembly is assembled, the second thread 201 is an external thread and the first thread 101 is an internal thread. The first thread 101 and the second thread 201 are connected to realize the connection between the first shell 1 and the second shell 2.

[0034] The two second threads 201 are both arranged between the two first threads 101, which means that in the first direction, the width of the first shell 1 is greater than the width of the second shell 2. When the outer shell assembly is assembled, the second thread 201 is an internal thread and the first thread 101 is an external thread. The first thread 101 and the second thread 201 are connected to realize the connection between the first shell 1 and the second shell 2.

[0035] First threads 101 are provided on both sides of the end of the first shell 1 near the opening, that is, internal threads and external threads are provided on the end of the first shell 1 near the opening, respectively. This arrangement can use a stamping process to directly stamp out internal and external threads, simplify the thread manufacturing process, and reduce the processing cost of the shell. Similarly, second threads 201 are provided on both sides of the end of the second shell 2 near the opening. The function of the two second threads 201 is also to simplify the thread manufacturing process and reduce the processing cost of the shell.

[0036] It should be noted that when only one first thread 101 is provided at one end of the first shell 1 close to the opening, that is, an external thread is provided at one end of the first shell 1 close to the opening, and the first thread 101 can be provided by laser or by stamping (stamping is generally possible when the thickness of the first shell 1 is thicker). When only one second thread 201 is provided at one end of the second shell 2 close to the opening, that is, an internal thread is provided at one end of the second shell 2 close to the opening; the internal thread is provided by one of laser and stamping.

[0037] In some embodiments, the thread length of the first thread 101 is 2 to 5 m, and the thread length of the second thread 201 is 2 to 5 mm.

[0038] Specifically, by controlling the lengths of the first thread 101 and the second thread 201 to be within the above range, the housing assembly can bear the weight of the entire battery when applied to the battery.

[0039] The lengths of the first thread 101 and the second thread 201 may be, for example, 2 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., as long as the lengths are within the range of 2 to 5 mm.

[0040] In some embodiments, the thread width of the first thread 101 is 0.5-2 mm, and the thread width of the second thread 201 is 0.5-2 mm.

[0041] Specifically, the thread widths of the first thread 101 and the second thread 201 are controlled within the above range, which can improve the sealing performance between the first shell 1 and the second shell 2 .

[0042] The thread width of the first thread 101 and / or the thread width of the second thread 201 may be 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, etc., as long as the thread width of the first thread 101 and the thread width of the second thread 201 are within the range of 0.5 to 2 mm.

[0043] In some embodiments, the thickness of the insulating sealing layer 3 is 0.1-1 mm.

[0044] Specifically, the thickness of the insulating sealing layer 3 is in the range of 0.1 to 1 mm, which can effectively prevent the battery from short circuiting. At the same time, it is filled into the matching gap between the first thread 101 and the second thread 201, which can effectively prevent moisture and oxygen in the air from entering the battery and prevent the battery from leaking.

[0045] like Figure 1 As shown, the insulating sealing layer 3 is filled between the first thread 101 and the second thread 201 , and at the same time, the insulating sealing layer 3 extends to the head end of the first thread 101 and the head end of the second thread 201 , which can play a better sealing and insulating role.

[0046] In some embodiments, the insulating sealing layer 3 is an elastic layer, and the insulating sealing layer 3 fits the first thread 101 or the second thread 201 .

[0047] Specifically, when the insulating sealing layer 3 is made of elastic material, it is not necessary to provide threads on both sides of the insulating sealing layer 3 , and the threaded sealing connection between the first shell 1 and the second shell 2 can also be achieved.

[0048] In some embodiments, a third thread is provided on the side of the insulating sealing layer 3 facing the first thread 101, and the third thread is threadedly connected to the first thread 101; a fourth thread is provided on the side of the insulating sealing layer 3 facing the second thread 201, and the fourth thread is threadedly connected to the second thread 201.

[0049] Specifically, when the insulating sealing layer 3 is made of a slightly harder material layer, the third thread and the fourth thread are arranged to enable the first shell 1 , the second shell 2 and the insulating sealing layer 3 to be sealed and connected to prevent battery leakage.

[0050] In some embodiments, the insulating sealing layer 3 is made of at least one of epoxy resin, silicone resin, phenolic resin, polyester, and polybutadiene.

[0051] In some embodiments, in the first direction, the outer diameter a of the first shell 1 is 6 to 14 mm, and the outer diameter b of the second shell 2 is 6 to 14 mm;

[0052] In the second direction, the heights of the first shell 1 and the second shell 2 are both 3-8 mm;

[0053] The first direction is perpendicular to the second direction.

[0054] Specifically, Figure 1As shown, the first direction is the x-axis direction, and the second direction is the y-axis direction. In the first direction, a is 6 to 14 mm, b is 6 to 14 mm, and the height of the first shell 1 and the second shell 2 is 3 to 8 mm. The width and height of the first shell 1 and the width and height of the second shell 2 are limited here for button batteries. It should be noted that if the housing assembly of the present application is applied to other types of batteries, the height and width of the first shell 1 and the height and width of the second shell 2 can be increased accordingly.

[0055] In some embodiments, a is greater than b, and 0.5 mm ≤ ab ≤ 3 mm.

[0056] Specifically, controlling ab within the range of 0.5 to 3 mm facilitates the first thread 101 and the second thread 201 to be threadedly matched and realizes the connection between the first thread 101 and the second thread 201. The value of ab should be the same as the thread width of the first thread 101 and the second thread 201, so that the first thread 101 and the second thread 201 can be threadedly matched.

[0057] In some embodiments, a is less than b, and 0.5 mm≤ba≤3 mm.

[0058] Specifically, controlling ba within the range of 0.5 to 3 mm facilitates the first thread 101 and the second thread 201 to be threadedly matched and realizes the connection between the first thread 101 and the second thread 201. The value of ba should be the same as the thread width of the first thread 101 and the second thread 201, so that the first thread 101 and the second thread 201 can be threadedly matched.

[0059] In some preferred embodiments, the width of the first thread 101 is the same as the width of the second thread 201 .

[0060] In a second aspect, the present application provides a battery, comprising the housing assembly described above.

[0061] The battery provided in the present application uses the above-mentioned shell assembly, and there is no need to laser weld the cover plate and the shell, which reduces the dimensional accuracy of the shell cover and reduces the production cost; at the same time, the insulating sealing layer 3 is used to fill the fitting gap between the first thread 101 and the second thread 201, which simplifies the steel shell button battery assembly sealing method and improves production efficiency. Compared with the traditional shell cover laser welding method, the sealing performance is more reliable.

[0062] In some embodiments, the battery includes a pole core 4, the first shell 1 and the second shell 2 are surrounded by a receiving cavity, and the pole core 4 is arranged in the receiving cavity; the pole core 4 also includes a first pole ear 401 and a second pole ear 402, the first pole ear 401 is welded to the side of the first shell 1 facing the pole core 4, and the second pole ear 402 is welded to the side of the second shell 2 facing the pole core 4.

[0063] Specifically, the first electrode tab 401 and the second electrode tab 402 have opposite polarities. For example, when the first electrode tab 401 is a positive electrode tab, the second electrode tab 402 is a negative electrode tab. When the first electrode tab 401 is a negative electrode tab, the second electrode tab 402 is a positive electrode tab.

[0064] The first shell 1 is welded to the first pole tab 401 , the second shell 2 is welded to the second pole tab 402 , and the insulating sealing layer 3 is filled between the first thread 101 and the second thread 201 to prevent the first shell 1 and the second shell 2 from contacting each other, thereby preventing the battery from short circuiting.

[0065] 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 assembly, characterized in that: It includes a first shell, a second shell and an insulating sealing layer, the first shell and the second shell are both provided with openings, the first shell is provided with a first thread at one end close to the opening, the second shell is provided with a second thread at one end close to the opening, the insulating sealing layer is provided between the first thread and the second thread, and the first shell and the second shell are connected in an insulating and sealing manner through the first thread and the second thread.

2. The housing assembly according to claim 1, characterized in that The first shell has first threads on both sides of one end close to the opening, the second shell has second threads on both sides of one end close to the opening, and the two first threads are arranged between the two second threads; Or the two second threads are arranged between the two first threads.

3. The housing assembly according to claim 1, characterized in that The thread length of the first thread is 2 to 5 mm, and the thread length of the second thread is 2 to 5 mm.

4. The housing assembly according to claim 1 or 3, characterized in that: The thread width of the first thread is 0.5 to 2 mm, and the thread width of the second thread is 0.5 to 2 mm.

5. The housing assembly according to claim 1, wherein: The thickness of the insulating sealing layer is 0.1-1 mm.

6. The housing assembly according to claim 1, wherein: The insulating sealing layer is an elastic layer, and the insulating sealing layer fits the first thread or the second thread; Alternatively, a third thread is provided on the side of the insulating sealing layer facing the first thread, and the third thread is threadedly connected to the first thread; a fourth thread is provided on the side of the insulating sealing layer facing the second thread, and the fourth thread is threadedly connected to the second thread.

7. The housing assembly according to claim 6, characterized in that The outer diameter a of the first shell is 6 to 14 mm, and the outer diameter b of the second shell is 6 to 14 mm; The heights of the first shell and the second shell are both 3-8 mm.

8. The housing assembly according to claim 7, characterized in that a is greater than b, and 0.5mm≤ab≤3mm, Or a is smaller than b, and 0.5mm≤ba≤3mm.

9. A battery, characterized in that: A housing assembly comprising any one of claims 1 to 8.

10. The battery according to claim 9, characterized in that The battery includes a pole core, the first shell and the second shell are arranged to form a accommodating cavity, and the pole core is arranged in the accommodating cavity; the pole core also includes a first pole ear and a second pole ear, the first pole ear is welded to the side of the first shell facing the pole core, and the second pole ear is welded to the side of the second shell facing the pole core.

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