Combined battery metal shell and battery using same

Abstract

The utility model relates to a combined battery metal shell and a battery using the same, and belongs to the field of batteries, the combined battery metal shell comprises a hollow cylindrical shell body, a mounting space is formed in the shell body, the shell body is formed by splicing a first shell and a second shell, the first shell comprises a first sleeve and a first bottom plate, and the second shell comprises a second sleeve and a second bottom plate. The second shell comprises a second sleeve and a second bottom plate; the second sleeve and the first sleeve have the same outer diameter and inner diameter; first mounting holes penetrating through the first bottom plate and the second bottom plate are formed in the middle positions of the first bottom plate and the second bottom plate; a positive pole and a negative pole which are in sealing fit with the first bottom plate and the second bottom plate are respectively mounted at the first mounting holes of the first bottom plate and the second bottom plate through riveting pieces; a second mounting hole penetrating through the first bottom plate and / or the second bottom plate is further formed in the first bottom plate and / or the second bottom plate, and an anti-explosion valve in sealing fit with the second mounting hole is mounted at the second mounting hole. According to the utility model, the probability of quality problems in the production process of the battery shell can be reduced, the quality of the battery shell is ensured, and the production cost of the battery shell is reduced.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a combined battery metal casing and a battery using the same. Background Technology

[0002] Cylindrical batteries are batteries with a cylindrical shape, commonly found in various battery types such as lithium batteries and sodium batteries. These batteries are widely used due to their simple structure, relatively large size, and ease of mass production.

[0003] Cylindrical lithium-ion battery casings are typically made of metals such as steel and aluminum. Their primary function is to protect the internal components and provide a sealed environment for the battery. Currently, battery casings are usually manufactured using deep drawing processes. In deep drawing, the greater the depth, the more difficult it is to guarantee the quality of the drawn part. For example: 1. As the drawing depth increases, improper pressure control can lead to wrinkles in the sheet metal, especially at greater depths; 2. As the depth increases, the metal thickness gradually decreases, particularly in the bottom area. Insufficient uniformity during the deep drawing process can result in an excessively thin bottom, or even penetration; 3. With increasing depth, the work hardening effect of the metal material may become more pronounced. Work hardening reduces the material's plasticity, making subsequent forming more difficult and increasing the risk of breakage during the deep drawing process.

[0004] Based on this, the present invention provides a modular battery metal casing and a battery using the same. By setting the battery casing as a modular structure, the required drawing depth during the casing production process can be greatly reduced, thereby reducing the probability of quality problems in the battery casing during production and ensuring the quality of the battery casing. At the same time, since the production difficulty of the battery casing is reduced, the production cost of the battery casing can also be effectively reduced. Utility Model Content

[0005] Therefore, it is necessary to provide a modular battery metal casing, including a hollow cylindrical casing body with an installation space formed within it. The casing body is assembled from an integrally formed first casing and an integrally formed second casing. The first casing includes a cylindrical first sleeve and a first base plate disposed at one end of the first sleeve and sealingly engaging with it. The second casing includes a cylindrical second sleeve and a second base plate disposed at one end of the second sleeve and sealingly engaging with it. The second sleeve has the same outer and inner diameter as the first sleeve, and the second casing is located away from the first sleeve. One end of the second base plate is fixedly connected to the end of the first housing away from the first base plate in a sealing fit, and the axes of the second sleeve and the first sleeve are on the same straight line; a first mounting hole is opened through the middle position of the first base plate and the second base plate, and a positive electrode post and a negative electrode post are respectively installed at the first mounting hole of the first base plate and the second base plate by riveting parts, and the positive electrode post and the negative electrode post extend into the mounting space; a second mounting hole is also opened through the first base plate and / or the second base plate, and an explosion-proof valve is installed at the second mounting hole in a sealing fit.

[0006] In this invention, the outer casing is used for cylindrical lithium batteries and cylindrical sodium batteries. It is composed of a first casing and a second casing joined together, and the resulting mounting space accommodates the lithium battery or sodium battery cell. Positive and negative terminals, connected at both ends of the outer casing via riveting, are used to connect to the positive and negative electrodes of the battery cell, thereby enabling electrical conductivity between the positive and negative terminals and the battery cell. The explosion-proof valve installed at the second mounting hole can be a conventional explosion-proof valve, thus providing explosion protection for the outer casing.

[0007] In this invention, the first shell and the second shell are integrally formed by a deep drawing process. The taller outer shell body is formed by assembling the shorter first shell and the second shell. Therefore, compared to directly drawing the shell, this invention performs deep drawing on the first shell and the second shell separately before assembling them, which reduces the required deep drawing depth during the shell's production process. Specifically, if the first shell and the second shell have the same height, the deep drawing depth can be reduced by half. Reducing the deep drawing depth effectively increases the difficulty and quality of the deep drawing process. Therefore, this invention can reduce the probability of quality problems occurring in the battery shell during production, ensure the quality of the battery shell, and reduce the production cost of the battery shell.

[0008] Furthermore, the end of the second housing away from the second base plate is welded together with the end of the first housing away from the first base plate.

[0009] In this invention, the first shell and the second shell abut against each other and are fixed and sealed to each other by welding. The welding method can be laser welding. It is worth noting that in the battery production process, the battery cell must be placed inside the outer shell before the welding of the first shell and the second shell can be carried out.

[0010] Furthermore, both the positive electrode post and the negative electrode are cylindrical and have the same diameter and height. A through-hole is formed on the positive electrode post along its axial direction, and a plug for sealing the through-hole is embedded within the through-hole. The riveting component includes a cylindrical insertion portion, one end of which extends outward to form a plate-shaped abutment plate. The riveting component also includes an insulating sleeve, which includes an annular collar embedded in the first mounting hole. The collar is tightly fitted to the first mounting hole, and both ends of the collar are folded outward to adhere to the inner and outer surfaces of the base plate, forming an insulating baffle. The insertion portion is embedded in the... A collar is provided and tightly fitted with the collar. The abutment plate has an installation groove on one side facing the insertion part. The installation groove surrounds the insertion part and an insulating sealing ring is installed in the installation groove. The insulating sealing ring abuts against the bottom of the installation groove and the base plate. The insertion part has a cylindrical insertion hole that penetrates it along its axial direction for embedding the positive and negative terminals. The depth of the cylindrical insertion hole is less than the height of the positive and negative terminals. The positive and negative terminals are respectively embedded in the cylindrical insertion holes of the riveting parts on the first and second base plates and are sealed with the cylindrical insertion holes.

[0011] In this invention, the collar of the insulating sleeve is tightly fitted to the first mounting hole by abutting against it. Insulating baffles on both sides of the collar are attached to both sides of the first mounting hole, securing the collar to the hole. The insertion part is tightly fitted to the collar by abutting against its inner wall. By embedding the insertion part at a predetermined position within the collar, the abutting plate on the insertion part presses the insulating sealing ring in the mounting groove against the first or second base plate, thus achieving a seal between the riveted component and the first or second base plate. The insulating baffles on the collar act as a barrier between the abutting plate and the first or second base plate, thus insulating the riveted component from the first or second base plate. Preferably, the first mounting hole is circular, the collar is annular, and the insertion part is cylindrical.

[0012] In this invention, the positive and negative terminals are fixed to the riveting component by being inserted into the cylindrical insertion holes on the connector. Since the depth of the cylindrical insertion holes is less than the height of the positive and negative terminals, both ends of the positive and negative terminals extend out of the cylindrical insertion holes. In addition, to fix the positive and negative terminals, they can be welded together with the cylindrical insertion holes.

[0013] Furthermore, the end of the injection hole on the positive electrode post that is away from the installation space expands outward to form a sealing hole. A sealing nail is fixedly installed in the sealing hole, and the sealing nail abuts against the plug.

[0014] In this invention, the injection hole on the positive electrode post is used to inject electrolyte into the outer casing. The plug embedded in the post is used to seal the injection hole to seal the outer casing. The sealing pin is used to support and block the plug to prevent the plug from falling out of the injection hole during the use of the outer casing. Preferably, the sealing pin is made of metal and is fixed in the sealing hole by welding.

[0015] Furthermore, the thickness of the first sleeve and the second sleeve is 0.2-5mm, the diameter of the first sleeve and the second sleeve is 20-300mm, and the height of the first sleeve and the second sleeve is 50-300mm.

[0016] Furthermore, the insulating sealing ring is an O-ring made of EPDM rubber, and the insulating sleeve is made of polytetrafluoroethylene.

[0017] On the other hand, the present invention also provides a battery that uses the aforementioned battery metal casing as its casing.

[0018] Furthermore, the battery includes a cylindrical cell, which is formed by sequentially stacking a positive electrode sheet, a separator, and a negative electrode sheet. The edge of the positive electrode sheet within the cell extends towards one end of the cell, forming a positive electrode welding end. The edge of the negative electrode sheet within the cell extends towards the other end of the cell, forming a negative electrode welding end. The cell is embedded within the mounting space of the outer casing. Positive and negative electrode current collectors are welded to the positive and negative electrode welding ends of the cell, respectively, and these current collectors are welded to the ends of the positive and negative electrode posts that extend into the mounting space. The wound cell needs to be secured with tape to prevent it from unraveling.

[0019] In this invention, the battery assembly process is as follows:

[0020] First, install the riveting parts into the first mounting holes on the first housing and the second housing, and install the explosion-proof valve at the second mounting hole;

[0021] Then, the positive and negative terminals are soldered onto the positive and negative current collectors, respectively.

[0022] Then, the positive current collector and the negative current collector are soldered to the positive and negative welding ends of the battery cell.

[0023] Then, the first and second housings are fitted onto both ends of the battery cell, so that the first and second housings abut against each other, and the positive and negative terminals protrude from the cylindrical insertion holes of the riveting parts.

[0024] Finally, laser welding is used to weld the parts where the first and second housings abut together.

[0025] The principle and effects of this utility model will be further explained below with reference to the above technical solution and the accompanying drawings:

[0026] In this invention, the taller outer shell is formed by combining a first shell and a second shell with a shorter height. Therefore, compared to directly drawing the shell, this invention can reduce the drawing depth required in the shell drawing process. Specifically, if the first shell and the second shell have the same height, the drawing depth can be reduced by half. By reducing the drawing depth, the difficulty and quality of the drawing process can be effectively increased. Therefore, this invention can reduce the probability of quality problems in the battery shell during production, ensure the quality of the battery shell, and reduce the production cost of the battery shell. Attached Figure Description

[0027] Figure 1 This is a cross-sectional structural diagram of the outer shell body described in an embodiment of the present utility model;

[0028] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0029] Figure 3 for Figure 1 A magnified view of part B;

[0030] Figure 4 This is a cross-sectional structural diagram of the battery described in an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures

[0032] 11-First sleeve, 12-First base plate, 21-Second sleeve, 22-Second base plate, 32-Second mounting hole, 41-Insertion part, 42-Abutting plate, 43-Insulating sealing ring, 51-Collar ring, 52-Insulating baffle, 6-Negative pole post, 7-Positive pole post, 71-Injection hole, 72-Plug, 73-Sealing nail, 8-Battery cell, 81-Positive welding end, 82-Negative welding end, 83-Tape, 91-Positive current collector, 92-Negative current collector. Detailed Implementation

[0033] To facilitate understanding by those skilled in the art, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0034] like Figure 1-4 A modular battery metal casing includes a hollow cylindrical casing body with an installation space formed within it. The casing body is assembled from an integrally formed first casing and an integrally formed second casing. The first casing includes a cylindrical first sleeve 11 and a first base plate 12 disposed at one end of the first sleeve 11 and sealingly fitted with it. The second casing includes a cylindrical second sleeve 21 and a second base plate 22 disposed at one end of the second sleeve 21 and sealingly fitted with it. The second sleeve 21 has the same outer and inner diameter as the first sleeve 11. The end of the second casing away from the second base plate 22... The first sleeve 21 is fixedly connected to the end of the first housing away from the first base plate 12 in a sealing fit, and the axes of the second sleeve 21 and the first sleeve 11 are on the same straight line; a first mounting hole is opened in the middle position of the first base plate 12 and the second base plate 22, and a positive electrode post 7 and a negative electrode post 6 are respectively installed in the first mounting hole of the first base plate 12 and the second base plate 22 by riveting, and the positive electrode post 7 and the negative electrode post 6 both extend into the mounting space; a second mounting hole 32 is also opened in the first base plate 12 and / or the second base plate 22, and an explosion-proof valve is installed in the second mounting hole 32 in a sealing fit.

[0035] In this invention, the outer casing is used as the outer casing for cylindrical lithium batteries and cylindrical sodium batteries. It is composed of a first casing and a second casing joined together, and the installation space formed within it is used to accommodate the battery cell 8 of the lithium battery or sodium battery. The positive electrode post 7 and negative electrode post 6, which are riveted to both ends of the outer casing, are used to connect with the positive and negative electrode plates of the battery cell 8, thereby achieving electrical conductivity between the positive electrode post 7 and negative electrode post 6 and the battery cell 8. The explosion-proof valve installed at the second mounting hole 32 can be a conventional explosion-proof valve, thus giving the outer casing an explosion-proof function.

[0036] In this invention, the first shell and the second shell are integrally formed by a deep drawing process. The taller outer shell body is formed by assembling the shorter first shell and the second shell. Therefore, compared to directly drawing the shell, this invention performs deep drawing on the first shell and the second shell separately before assembling them, which reduces the required deep drawing depth during the shell's production process. Specifically, if the first shell and the second shell have the same height, the deep drawing depth can be reduced by half. Reducing the deep drawing depth effectively increases the difficulty and quality of the deep drawing process. Therefore, this invention can reduce the probability of quality problems occurring in the battery shell during production, ensure the quality of the battery shell, and reduce the production cost of the battery shell.

[0037] In one embodiment, the end of the second housing away from the second base plate 22 is welded to the end of the first housing away from the first base plate 12.

[0038] In this embodiment, the first shell and the second shell abut against each other and are fixed and sealed to each other by welding. The welding method can be laser welding. It is worth noting that in the battery production process, the battery cell 8 needs to be placed inside the outer shell before the welding of the first shell and the second shell can be carried out.

[0039] In one embodiment, both the positive electrode post 7 and the negative electrode are cylindrical and have the same diameter and height. A liquid injection hole 71 is formed through the positive electrode post 7 along its axial direction, and a plug 72 for sealing the liquid injection hole is embedded within the liquid injection hole 71. The riveting component includes a cylindrical insertion portion 41, one end of which extends outward to form a plate-shaped abutment plate 42. The riveting component also includes an insulating sleeve, which includes an annular collar 51 embedded in the first mounting hole. The collar 51 is tightly fitted to the first mounting hole, and both ends of the collar 51 are folded outward to adhere to the inner and outer surfaces of the base plate, forming an insulating baffle 52. The insertion portion 41 is embedded in the... The collar 51 is tightly fitted with the collar 51. The abutment plate 42 has an installation groove on one side facing the insertion part 41. The installation groove surrounds the insertion part and an insulating sealing ring 43 is installed in the installation groove. The insulating sealing ring 43 abuts against the bottom of the installation groove and the base plate. The insertion part 41 has a cylindrical insertion hole through it along its axial direction for embedding the positive electrode 7 and the negative electrode 6. The depth of the cylindrical insertion hole is less than the height of the positive electrode 7 and the negative electrode 6. The positive electrode 7 and the negative electrode 6 are respectively embedded in the cylindrical insertion holes of the riveting parts on the first base plate 12 and the second base plate 22 and are sealed with the cylindrical insertion holes.

[0040] In this embodiment, the collar 51 of the insulating sleeve is tightly fitted to the first mounting hole by abutting against it. The insulating baffles 52 on both sides of the collar 51 are attached to both sides of the first mounting hole, which can fix the collar 51 to the first mounting hole. The insertion part 41 is tightly fitted to the collar 51 by abutting against the inner side wall of the collar 51. By embedding the insertion part 41 at a preset position in the collar 51, the abutting plate 42 on the insertion part 41 can press the insulating sealing ring 43 in the mounting groove against the first base plate 12 or the second base plate 22, thereby achieving a seal between the riveted part and the first base plate 12 or the second base plate 22. The insulating baffles 52 on the collar 51 are spaced between the abutting plate 42 and the first base plate 12 or the second base plate 22, thereby achieving insulation between the riveted part and the first base plate 12 or the second base plate 22. Preferably, the first mounting hole is a round hole, and correspondingly, the collar 51 is annular and the insertion part 41 is cylindrical.

[0041] In this embodiment, the positive terminal 7 and the negative terminal 6 are fixed to the riveting member by inserting them into the cylindrical insertion holes on the insertion part 41. Since the depth of the cylindrical insertion hole is less than the height of the positive terminal 7 and the negative terminal 6, both ends of the positive terminal 7 and the negative terminal 6 extend out of the cylindrical insertion hole.

[0042] In one embodiment, the end of the injection hole 71 on the positive electrode post 7 that is away from the installation space expands outward to form a sealing hole. A sealing nail 73 is fixedly installed in the sealing hole, and the sealing nail 73 abuts against the plug 72.

[0043] In this embodiment, the injection hole 71 on the positive electrode post 7 is used to inject electrolyte into the outer casing, the plug 72 embedded in the post is used to seal the injection hole 71 to seal the outer casing, and the sealing nail 73 is used to support and block the plug 72 to prevent the plug 72 from falling out of the injection hole 71 during the use of the outer casing. Preferably, the sealing nail 73 is made of metal and is fixed in the sealing hole by welding.

[0044] In one embodiment, the thickness of the first sleeve 11 and the second sleeve 21 is 0.2-5mm, the diameter of the first sleeve 11 and the second sleeve 21 is 20-300mm, and the height of the first sleeve 11 and the second sleeve 21 is 50-300mm.

[0045] In one embodiment, the insulating sealing ring 43 is an O-ring made of EPDM rubber, and the insulating sleeve is made of polytetrafluoroethylene.

[0046] On the other hand, the present invention also provides a battery that uses the aforementioned battery metal casing as its casing.

[0047] In this invention, the battery includes a cylindrical cell 8, which is formed by sequentially stacking a positive electrode sheet, a separator, and a negative electrode sheet. The edge of the positive electrode sheet within the cell 8 extends towards one end of the cell 8, forming a positive electrode welding end 81. The edge of the negative electrode sheet within the cell 8 extends towards the other end of the cell 8, forming a negative electrode welding end 82. The cell 8 is embedded within the mounting space of the outer casing. A positive electrode current collector 91 and a negative electrode current collector 92 are respectively welded to the positive electrode current collector 7 and the negative electrode current collector 6, respectively, which are then welded to the ends of the positive electrode post 7 and the negative electrode post 6 extending into the mounting space. The wound cell 8 needs to be secured with adhesive tape 83 to prevent it from unraveling.

[0048] In this invention, the battery assembly process is as follows:

[0049] First, install the riveting parts into the first mounting holes on the first housing and the second housing, and install the explosion-proof valve at the second mounting hole 32;

[0050] Then, the positive terminal 7 and the negative terminal 6 are welded to the positive current collector 91 and the negative current collector 92;

[0051] Then, the positive current collector 91 and the negative current collector 92 are welded to the positive welding end 81 and the negative welding end 82 of the cell 8.

[0052] Then, the first and second housings are fitted onto both ends of the battery cell 8, so that the first and second housings abut against each other, and the positive terminal 7 and the negative terminal 6 pass through the cylindrical insertion hole of the riveting piece.

[0053] Finally, laser welding is used to weld the parts where the first and second housings abut together.

[0054] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A modular battery metal casing, comprising a hollow cylindrical casing body, wherein an installation space is formed within the casing body, characterized in that, The outer shell is assembled from an integrally formed first shell and an integrally formed second shell. The first shell includes a cylindrical first sleeve and a first base plate disposed at one end of the first sleeve and sealed to fit with the first sleeve. The second shell includes a cylindrical second sleeve and a second base plate disposed at one end of the second sleeve and sealed to fit with the second sleeve. The second sleeve has the same outer diameter and inner diameter as the first sleeve. The end of the second shell away from the second base plate is fixedly connected to the end of the first shell away from the first base plate in a sealed fit, and the axes of the second sleeve and the first sleeve are on the same straight line. A first mounting hole is provided through the middle of the first base plate and the second base plate. A positive electrode post and a negative electrode post are respectively installed at the first mounting hole of the first base plate and the second base plate and sealed to fit with it by riveting parts, and the positive electrode post and the negative electrode post extend into the mounting space. A second mounting hole is also provided through the first base plate and / or the second base plate, and an explosion-proof valve is installed at the second mounting hole and sealed to fit with it.

2. The combined battery metal casing according to claim 1, characterized in that, The end of the second housing away from the second base plate is welded together with the end of the first housing away from the first base plate.

3. A combined battery metal casing according to claim 1 or 2, characterized in that, Both the positive electrode post and the negative electrode post are cylindrical and have the same diameter and height. A liquid injection hole is formed through the positive electrode post along its axis, and a plug for sealing the injection hole is embedded within the hole. The riveting component includes a columnar insertion portion, one end of which extends outward to form a plate-shaped abutment plate. The riveting component also includes an insulating sleeve, which includes an annular collar fitted into the first mounting hole. The collar is tightly fitted into the first mounting hole, and both ends of the collar are folded outward to adhere to the inner and outer surfaces of the base plate, respectively, forming an insulating baffle. The insertion portion is embedded in the collar. The abutment plate is tightly fitted with the collar, and a mounting groove is provided on one side of the insertion part. The mounting groove surrounds the insertion part, and an insulating sealing ring is installed in the mounting groove. The insulating sealing ring abuts against the bottom of the mounting groove and the base plate. A cylindrical insertion hole is provided on the insertion part along its axial direction for embedding the positive and negative terminals. The depth of the cylindrical insertion hole is less than the height of the positive and negative terminals. The positive and negative terminals are respectively embedded in the cylindrical insertion holes of the riveting parts on the first and second base plates, and are sealed with the insertion holes.

4. The combined battery metal casing according to claim 3, characterized in that, The injection hole on the positive electrode post expands outward at the end away from the installation space to form a sealing hole. A sealing nail is fixedly installed in the sealing hole, and the sealing nail abuts against the plug.

5. A combined battery metal casing according to claim 4, characterized in that, The thickness of the first sleeve and the second sleeve is 0.2-5mm, the diameter of the first sleeve and the second sleeve is 20-300mm, and the height of the first sleeve and the second sleeve is 50-300mm.

6. The combined battery metal casing according to claim 5, characterized in that, The insulating sealing ring is an O-ring made of EPDM rubber, and the insulating sleeve is made of polytetrafluoroethylene.

7. A battery, characterized in that, Use the battery metal casing as described in any one of claims 1-6.

8. A battery according to claim 7, characterized in that, The battery includes a cylindrical battery cell, which is formed by sequentially stacking a positive electrode plate, a separator, and a negative electrode plate. The edge of the positive electrode plate inside the battery cell extends towards one end of the battery cell to form a positive electrode welding end, and the edge of the negative electrode plate inside the battery cell extends towards the other end of the battery cell to form a negative electrode welding end. The battery cell is embedded in the mounting space of the outer casing. The positive electrode welding end and the negative electrode welding end of the battery cell are respectively welded with a positive electrode current collector and a negative electrode current collector, and the positive electrode current collector and the negative electrode current collector are respectively welded to the ends of the positive electrode post and the negative electrode post that extend into the mounting space.

Images