Battery casing and battery

Abstract

This utility model relates to a battery casing and a battery. The battery casing includes a main casing and a cover. The main casing includes a base plate, a first surrounding plate, and a first flange. The first surrounding plate surrounds the periphery of the base plate, forming a first chamber between the base plate and the first surrounding plate. The first flange surrounds the end of the first surrounding plate opposite to the base plate and is located outside the first chamber. The cover includes a cover plate, a second surrounding plate, and a second flange. The second surrounding plate surrounds the periphery of the cover plate, forming a second chamber between the cover plate and the second surrounding plate. The second flange surrounds the end of the second surrounding plate opposite to the cover plate and is located outside the second chamber. The cover and the main casing are fastened together, and the first flange and the second flange are welded together. The first chamber and the second chamber communicate to form a receiving cavity. This battery casing features high structural strength and low manufacturing difficulty.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery casing and a battery containing the battery casing. Background Technology

[0002] A battery generally consists of a casing and electrode materials (e.g., positive and negative electrodes) disposed within the casing. Conductive terminals are mounted on the casing to connect the electrode materials to an external power source or electrical device. Batteries serve as power sources for electronic devices (mobile phones, tablets, instruments, etc.). In electronic device applications, batteries are generally characterized by their small size, thinness, and compact structure.

[0003] In related technologies, the housing includes a lower housing and an upper housing. The lower housing is formed into a cavity for mounting electrode materials through a stamping process. The upper housing is a flat plate structure and covers the opening of the cavity in the lower housing to seal it. To improve the connection strength between the upper and lower housings, a flange structure is usually provided around the opening of the cavity. The flange structure abuts against the upper housing, increasing the contact area between the upper and lower housings. Furthermore, to ensure the sealing performance of the cavity, the upper and lower housings are connected and fixed by welding, with the welding position located on the flange structure. The housing in these related technologies has the following drawbacks: 1. Due to the thin wall thickness of the housing, when manufacturing batteries with greater thickness, a deeper cavity needs to be stamped in the lower housing. Increased stamping depth can easily lead to excessive thinning or cracking in certain areas of the lower housing, increasing manufacturing difficulty. 2. When the upper shell is squeezed by external force, the upper shell is recessed towards the cavity. At the same time, the connection between the upper shell and the inner side of the flange structure forms a lever fulcrum. The external force on the middle area of ​​the upper shell is indirectly applied to the weld located in the peripheral area of ​​the upper shell, which leads to the weld cracking and damage to the battery structure. Utility Model Content

[0004] The purpose of this invention is to provide a battery casing and a battery that have high structural strength and are easy to manufacture.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A battery casing is provided, comprising:

[0007] The main housing includes a base plate, a first surrounding plate, and a first flange. The first surrounding plate is disposed around the periphery of the base plate, and the base plate and the first surrounding plate form a first cavity. The first flange is disposed around the end of the first surrounding plate away from the base plate, and the first flange is located outside the first cavity.

[0008] The cover body includes a cover plate, a second surrounding plate, and a second flange. The second surrounding plate is disposed around the periphery of the cover plate, and the cover plate and the second surrounding plate form a second chamber. The second flange is disposed around one end of the second surrounding plate away from the cover plate, and the second flange is located outside the second chamber.

[0009] The cover is fastened together with the main housing, the first flange and the second flange are welded and fixed, and the first chamber and the second chamber communicate to form a receiving cavity for accommodating the electrode assembly.

[0010] Furthermore, the side of the first enclosure facing the first chamber is flush with the side of the second enclosure facing the second chamber.

[0011] Furthermore, the distance between the free end of the first flange and the first enclosure plate is less than or equal to 300 micrometers, and the distance between the free end of the second flange and the second enclosure plate is less than or equal to 300 micrometers.

[0012] Furthermore, the distance between the free end of the first flange and the first enclosure plate is equal to the distance between the free end of the second flange and the second enclosure plate.

[0013] Furthermore, the base plate and the first flange are both perpendicular to the first enclosure plate, and the cover plate and the second flange are both perpendicular to the second enclosure plate.

[0014] Furthermore, the connection points of the base plate and the first flange with the first enclosure plate are both rounded, and the connection points of the cover plate and the second flange with the second enclosure plate are also rounded.

[0015] Furthermore, the wall thickness of the main shell is 20 to 200 micrometers, and the wall thickness of the cover is 20 to 200 micrometers.

[0016] Furthermore, the wall thickness of the main housing is the same as the wall thickness of the cover.

[0017] Furthermore, the first or second enclosure is provided with an explosion-proof structure.

[0018] A battery is also provided, including an electrode assembly, a terminal post, and a battery housing, wherein the electrode assembly is installed within a receiving cavity of the battery housing, and the terminal post is installed on the battery housing and electrically connected to the electrode assembly.

[0019] The advantages of this utility model compared to the prior art are:

[0020] This utility model discloses a battery casing and a battery. A first chamber is formed on the main casing, and a second chamber is formed on the cover. The cover and the main casing are fastened together, and the first and second chambers communicate to form a receiving cavity. When the thickness of the battery casing is large, the depth of the first and second chambers can be adjusted to control the stamping depth of the main casing or cover within a reasonable range, thus avoiding excessive material thinning or cracking due to excessive stamping depth, and reducing manufacturing difficulty. Simultaneously, when the central area of ​​the cover is subjected to external force, the force is transmitted through the second enclosure plate along the thickness direction of the battery casing to the first enclosure plate and the first flange, causing compressive stress on the weld between the cover and the main casing. Compared to the existing technology where the weld is subjected to greater tensile stress due to the lever structure, the external force damage to the weld on this battery casing is significantly reduced, which helps to improve the overall structural strength of the battery casing. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the battery casing according to an embodiment of the present invention.

[0023] Figure 2 This is a cross-sectional view of the battery casing according to an embodiment of the present invention.

[0024] Figure 3 for Figure 2 Enlarged view of point A in the image.

[0025] Figure 4 This is a schematic diagram showing the connection between the main shell and the cover in an embodiment of the present invention.

[0026] In the picture:

[0027] 1. Main shell; 11. Base plate; 12. First enclosure plate; 13. First flange; 2. Cover body; 21. Cover plate; 22. Second enclosure plate; 23. Second flange; 3. Receiving cavity; 31. First chamber; 32. Second chamber. Detailed Implementation

[0028] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] like Figures 1 to 4As shown, the present invention provides a battery casing including a main casing 1 and a cover 2. The main casing 1 includes a base plate 11, a first surrounding plate 12, and a first flange 13. The first surrounding plate 12 is disposed around the periphery of the base plate 11, forming a first chamber 31 between the base plate 11 and the first surrounding plate 12. The first flange 13 is disposed at one end of the first surrounding plate 12 away from the base plate 11, and is disposed around the periphery of the first surrounding plate 12, with the first flange 13 located outside the first chamber 31. Alternatively, the first flange 13 can be understood as being annular, with one inner ring side of the first flange 13 connected to the first surrounding plate 12, and one outer ring side of the first flange 13 being the free end of the first flange 13, which extends in a direction away from the first chamber 31. The cover 2 has a similar external structure to the main shell 1. The cover 2 includes a cover plate 21, a second surrounding plate 22, and a second flange 23. The second surrounding plate 22 surrounds the periphery of the cover plate 21, forming a second chamber 32 between the cover plate 21 and the second surrounding plate 22. The second flange 23 is located at the end of the second surrounding plate 22 opposite to the cover plate 21, surrounding the periphery of the second surrounding plate 22 and located outside the second chamber 32. Alternatively, the second flange 23 can be understood as annular, with one inner ring connected to the second surrounding plate 22, and the outer ring of the second flange 23 being its free end, extending in a direction away from the second chamber 32. The cover 2 is fastened to the main shell 1, with the first flange 13 and the second flange 23 abutting against each other and fixed by welding, thus forming a sealed space between the cover 2 and the main shell 1. The first chamber 31 and the second chamber 32 are connected to form a receiving cavity 3, which is used to house the electrode assembly.

[0030] In this embodiment, both the main shell 1 and the cover 2 are integral structures. The main shell 1 is formed by stamping three continuously bent sections, forming a bottom plate 11, a first surrounding plate 12, and a first flange 13 connected sequentially from the middle to the periphery of the main shell 1. Similarly, the cover 2 is formed by stamping three continuously bent sections, forming a cover plate 21, a second surrounding plate 22, and a second flange 23 connected sequentially from the middle to the periphery of the cover 2. Correspondingly, the recessed area formed by stamping on the main shell 1 is the first chamber 31, and the recessed area formed by stamping on the cover 2 is the second chamber 32. The cover 2 is fastened to the main shell 1, and the first chamber 31 and the second chamber 32 communicate to form a receiving cavity 3, that is, the receiving cavity 3 is the sum of the first chamber 31 and the second chamber 32 combined together. In practical applications, when the thickness of the battery casing (the Z-direction in the diagram represents the thickness direction of the battery casing) is large, the stamping depth of the main casing 1 or the cover 2 can be controlled within a reasonable range by adjusting the depth dimensions of the first chamber 31 and the second chamber 32. This avoids excessive material thinning or cracking due to excessive stamping depth, thus reducing manufacturing difficulty. Simultaneously, when the central area of ​​the cover 2 is subjected to external pressure, the force is transmitted through the second enclosure 22 along the thickness direction of the battery casing to the first enclosure 12 and the first flange 13, causing compressive stress on the weld between the cover 2 and the main casing 1. Compared to the existing technology where the weld is subjected to significant tensile stress due to the lever structure, the external force damage to the weld on this battery casing is significantly reduced, which helps improve the overall structural strength of the battery casing.

[0031] In one alternative embodiment, the battery casing has a square structure, as shown in the reference. Figure 1 As shown, the length direction of the battery casing is the X direction, the width direction is the Y direction, and the thickness direction is the Z direction. The cover 2 and the main casing 1 are fastened together along the thickness direction of the battery casing. Correspondingly, the depth of the first chamber 31 and the depth of the second chamber 32 both extend along the thickness direction of the battery casing. Without changing the thickness of the battery casing, when the depth of the first chamber 31 increases, the depth of the second chamber 32 decreases accordingly; when the depth of the first chamber 31 decreases, the depth of the second chamber 32 increases accordingly.

[0032] In an optional embodiment, the side of the first enclosure 12 facing the first chamber 31 is flush with the side of the second enclosure 22 facing the second chamber 32. The first enclosure 12 has a square cylindrical structure, and the side of the first enclosure 12 facing the first chamber 31 is the inner wall of the first enclosure 12. Similarly, the second enclosure 22 has a square cylindrical structure, and the side of the second enclosure 22 facing the second chamber 32 is the inner wall of the second enclosure 22. By setting the inner walls of the first enclosure 12 and the second enclosure 22 to be flush, the first chamber 31 and the second chamber 32 have the same capacity, and the electrode assembly can be simultaneously accommodated in the first chamber 31 and the second chamber 32, which is beneficial to improving the space utilization of the entire accommodating cavity 3.

[0033] In an alternative embodiment, refer to Figure 4 As shown, the distance between the free end of the first flange 13 and the first enclosure 12 is less than or equal to 300 micrometers. This distance is the width D1 of the first flange 13, which is less than or equal to 300 micrometers. Similarly, the distance between the free end of the second flange 23 and the second enclosure 22 is less than or equal to 300 micrometers. This distance is the width D2 of the second flange 23, which is less than or equal to 300 micrometers. Since the first flange 13 and the second flange 23 are welded together, the size of the welded area is limited by the widths of the first flange 13 and the second flange 23. Furthermore, the first flange 13 and the second flange 23 occupy internal space in the electronic device. Therefore, while meeting welding process requirements, the widths D1 of the first flange 13 and D2 of the second flange 23 should be as small as possible. Optionally, the width D1 of the first flange 13 should be greater than or equal to 150 micrometers, and the width D2 of the second flange 23 should be greater than or equal to 150 micrometers. In this embodiment, the value range of the width D1 of the first flange 13 includes, but is not limited to, 150 micrometers, 160 micrometers, 170 micrometers, 180 micrometers, 190 micrometers, 200 micrometers, 210 micrometers, 220 micrometers, 230 micrometers, 240 micrometers, 250 micrometers, 260 micrometers, 270 micrometers, 280 micrometers, 290 micrometers, and 300 micrometers. The value range of the width D2 of the second flange 23 includes, but is not limited to, 150 micrometers, 160 micrometers, 170 micrometers, 180 micrometers, 190 micrometers, 200 micrometers, 210 micrometers, 220 micrometers, 230 micrometers, 240 micrometers, 250 micrometers, 260 micrometers, 270 micrometers, 280 micrometers, 290 micrometers, and 300 micrometers. For ease of processing, the distance between the free end of the first flange 13 and the first enclosure plate 12 is equal to the distance between the second flange 23 and the second enclosure plate 22, that is, the width D1 of the first flange 13 is equal to the width D2 of the second flange 23.

[0034] In an optional embodiment, both the base plate 11 and the first flange 13 are perpendicular to the first enclosure plate 12. By setting the base plate 11 perpendicular to the first enclosure plate 12, the first chamber 31 formed between them is square, which is beneficial for installing electrode assemblies in the first chamber 31 and improves the space utilization of the first chamber 31. By setting the first flange 13 perpendicular to the first enclosure plate 12, the side of the main housing 1 facing the cover 2 is horizontal, which facilitates installation and fixation with the cover 2. Similarly, the cover plate 21 and the second flange 23 are both perpendicular to the second enclosure plate 22. By setting the cover plate 21 perpendicular to the second enclosure plate 22, the second chamber 32 formed between them is square, which is beneficial for installing electrode assemblies in the second chamber 32 and improves the space utilization of the second chamber 32. By setting the second flange 23 perpendicular to the second enclosure plate 22, the side of the cover 2 facing the main housing 1 is horizontal, which facilitates installation and fixation with the main housing 1.

[0035] In one optional embodiment, the main housing 1 is a one-piece structure, formed by stamping to create a base plate 11, a first surrounding plate 12, and a first flange 13; the cover 2 is a one-piece structure, formed by stamping to create a cover plate 21, a second surrounding plate 22, and a second flange 23. The connection between the base plate 11 and the first surrounding plate 12, and the connection between the first flange 13 and the first surrounding plate 12, are the stamped bends. To meet the requirements of the stamping process, the bends of the main housing 1 are rounded, which also helps to eliminate the sharp edges of the bends on the main housing 1 and avoid mechanical damage to adjacent components. Similarly, the connection between the cover plate 21 and the second surrounding plate 22, and the connection between the second flange 23 and the second surrounding plate 22, are the stamped bends, and the bends of the cover 2 are rounded.

[0036] In one optional embodiment, the wall thickness of the main housing 1 is T1, and the dimension of T1 is 20 to 200 micrometers. The wall thickness of the cover 2 is T2, and the dimension of T2 is 20 to 200 micrometers. Specifically, the value range of the wall thickness T1 of the main housing 1 includes, but is not limited to, 20 micrometers, 30 micrometers, 40 micrometers, 50 micrometers, 60 micrometers, 70 micrometers, 80 micrometers, 90 micrometers, 100 micrometers, 110 micrometers, 120 micrometers, 130 micrometers, 140 micrometers, 150 micrometers, 160 micrometers, 170 micrometers, 180 micrometers, 190 micrometers, and 200 micrometers. The wall thickness T2 of the cover 2 can range from, but is not limited to, 20 micrometers, 30 micrometers, 40 micrometers, 50 micrometers, 60 micrometers, 70 micrometers, 80 micrometers, 90 micrometers, 100 micrometers, 110 micrometers, 120 micrometers, 130 micrometers, 140 micrometers, 150 micrometers, 160 micrometers, 170 micrometers, 180 micrometers, 190 micrometers, and 200 micrometers. In this embodiment, the wall thickness of the main shell 1 is the same as the wall thickness of the cover 2 to facilitate processing.

[0037] In an optional embodiment, the battery casing further includes an explosion-proof structure, which is disposed on the first enclosure 12 or the second enclosure 22. The explosion-proof structure is installed on the side wall of the battery casing, and the specific installation position of the explosion-proof structure can be adaptively selected according to the actual dimensions of the first enclosure 12 and the second enclosure 22, as well as the actual dimensions of the explosion-proof structure. In this embodiment, the depth of the first enclosure 12 is greater than the depth of the second enclosure 22, so the explosion-proof structure is installed on the first enclosure 12. The explosion-proof structure can be an explosion-proof valve or an explosion-proof line. When an explosion-proof valve is selected as the explosion-proof structure, an explosion-proof hole is provided through the first enclosure 12, and the explosion-proof valve is installed in the explosion-proof hole. When the battery experiences thermal runaway, the high-temperature gas in the containment cavity 3 can drive the explosion-proof valve to open, thereby achieving pressure relief. When an explosion-proof line is selected as the explosion-proof structure, a linear groove is provided on the first enclosure 12, and the corresponding linear groove becomes a weak area on the first enclosure 12. When the battery experiences thermal runaway, the explosion-proof wire area ruptures under the pressure of the high-temperature gas in the containment cavity 3 to release the pressure.

[0038] In an optional embodiment, the main housing 1 and the cover 2 are made of stainless steel.

[0039] like Figure 1 and Figure 2 As shown, this utility model also provides a battery, including a battery casing, an electrode assembly, and terminals. The electrode assembly includes a plurality of alternating positive and negative electrodes, separated from each other by a separator. The electrode assembly is used for electrochemical reactions, i.e., to achieve electrical energy storage. The electrode assembly is installed in a receiving cavity 3 inside the battery casing. The terminals serve as current conductors, and are installed on the side wall of the battery casing. One end of the terminal is electrically connected to the electrode assembly, and the other end is located outside the battery casing to connect to an external power source or electrical device. Specifically, the terminals are installed on the first enclosure 12, or on the second enclosure 22, or simultaneously through the first enclosure 12 and the second enclosure 22. In this embodiment, since the weld seam on the battery casing is located on the first flange 13 and the second flange 23, the weld seam is far away from the receiving cavity 3 inside the battery casing, preventing molten slag from falling into the receiving cavity 3 during welding and causing a short circuit in the electrode assembly. Furthermore, when the battery is subjected to external pressure, the weld is subjected to compressive stress, and the weld will not be damaged by the external pressure, which is beneficial to improving the overall structural strength of the battery. Also, since the receiving cavity 3 inside the battery casing is composed of a first chamber 31 on the main casing 1 and a second chamber 32 on the cover 2, the depth dimensions of the first chamber 31 and the second chamber 32 can be flexibly adjusted according to the stamping performance of the materials, which is beneficial to increasing the overall thickness of the battery under the same material properties.

[0040] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery casing, characterized in that, include: The main housing includes a base plate, a first surrounding plate, and a first flange. The first surrounding plate is disposed around the periphery of the base plate, and the base plate and the first surrounding plate form a first cavity. The first flange is disposed around the end of the first surrounding plate away from the base plate, and the first flange is located outside the first cavity. The cover body includes a cover plate, a second surrounding plate, and a second flange. The second surrounding plate is disposed around the periphery of the cover plate, and the cover plate and the second surrounding plate form a second chamber. The second flange is disposed around one end of the second surrounding plate away from the cover plate, and the second flange is located outside the second chamber. The cover is fastened together with the main housing, the first flange and the second flange are welded and fixed, and the first chamber and the second chamber communicate to form a receiving cavity for accommodating the electrode assembly.

2. The battery casing according to claim 1, characterized in that, The side of the first enclosure facing the first chamber is flush with the side of the second enclosure facing the second chamber.

3. The battery casing according to claim 1, characterized in that, The distance between the free end of the first flange and the first enclosure plate is less than or equal to 300 micrometers, and the distance between the free end of the second flange and the second enclosure plate is less than or equal to 300 micrometers.

4. The battery casing according to claim 3, characterized in that, The distance between the free end of the first flange and the first enclosure is equal to the distance between the free end of the second flange and the second enclosure.

5. The battery casing according to claim 1, characterized in that, The base plate and the first flange are both perpendicular to the first enclosure plate, and the cover plate and the second flange are both perpendicular to the second enclosure plate.

6. The battery casing according to claim 1, characterized in that, The bottom plate and the first flange both transition with the first enclosure plate at their connection points with the first enclosure plate, and the cover plate and the second flange both transition with the second enclosure plate at their connection points with the second enclosure plate.

7. The battery casing according to any one of claims 1 to 6, characterized in that, The wall thickness of the main shell is 20 to 200 micrometers, and the wall thickness of the cover is 20 to 200 micrometers.

8. The battery casing according to claim 7, characterized in that, The wall thickness of the main shell is the same as the wall thickness of the cover.

9. The battery casing according to any one of claims 1 to 6, characterized in that, An explosion-proof structure is provided on the first enclosure or the second enclosure.

10. A battery, characterized in that, The battery includes an electrode assembly, a terminal post, and a battery housing as described in any one of claims 1 to 9, wherein the electrode assembly is mounted within a receiving cavity of the battery housing, and the terminal post is mounted on the battery housing and electrically connected to the electrode assembly.

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