A cylindrical battery with shock and impact resistance

Abstract

This invention provides a cylindrical battery with shock and vibration resistance, comprising a cell with a positive electrode and a negative electrode at both ends; an aluminum shell covering the cell, the positive electrode, and the negative electrode; the positive electrode includes a positive current collector, the lower part of which is in surface contact with the end face of the cell, a positive cover plate on the positive current collector, the positive cover plate being in contact with the curved surface of the positive current collector, a positive insulation structure between the two, the positive cover plate being snapped into the aluminum shell, and a positive insulation ring filling the snapping point between the positive cover plate and the aluminum shell; the negative electrode includes a negative current collector welded to the other end face of the cell, a negative screw on the negative current collector, the negative screw extending out of the aluminum shell and screwed to a negative connecting block, a negative insulation sleeve and a negative O-ring between the two, a negative insulation structure between the negative current collector and the aluminum shell, and the positive current collector being welded to the cell, thereby enhancing the battery's vibration and shock resistance.

Description

Technical Field

[0001] This invention relates to energy storage devices, and more particularly to a cylindrical battery with shock and vibration resistance. Background Technology

[0002] Cylindrical batteries are a type of battery with high capacity, long cycle life, and a wide operating temperature range. They are used in solar lighting, lawn lighting, backup power, power tools, toy models, and photovoltaic energy applications.

[0003] From a long-term development perspective, lithium batteries have broad application prospects in energy storage and pure electric heavy-duty trucks in engineering infrastructure, logistics and transportation, which inevitably puts forward higher requirements for battery capacity, simple assembly process, easy quality control, reliability, strong vibration and shock resistance, safety and environmental protection.

[0004] Currently, cylindrical batteries generally have relatively small capacities. To meet capacity demands, the only solution is to significantly increase their production volume. However, this larger quantity places higher demands on the Battery Management System (BMS). Furthermore, the current method of connecting the positive and negative terminals with nuts is prone to loosening and is not resistant to vibration and impact. Summary of the Invention

[0005] This invention provides a cylindrical battery with shock and impact resistance, which aims to solve the problem of existing batteries being unable to withstand vibration and impact.

[0006] To achieve the above objectives, embodiments of the present invention provide a cylindrical battery with shock and impact resistance, comprising:

[0007] The battery cell has a positive terminal and a negative terminal at both ends;

[0008] An aluminum casing covers the battery cell, the positive electrode, and the negative electrode;

[0009] The positive electrode includes a positive current collector, which is welded to the end face of the battery cell and disposed inside the aluminum shell. The positive current collector is stepped, with its lower part in contact with the end face of the battery cell. The upper diameter of the positive current collector is smaller than the lower diameter. A positive cover plate is disposed on the positive current collector, which fits against the upper curved surface of the positive current collector. A positive insulation structure is disposed between the positive current collector and the positive cover plate. The positive cover plate is snapped into the aluminum shell, and a positive insulation ring is filled at the snapping point between the positive cover plate and the aluminum shell.

[0010] The negative electrode includes a negative current collector, which is welded to the other end face of the battery cell. A negative current collector is provided on the upper end face of the negative current collector. After the negative current collector passes through the aluminum shell, a negative connection block is screwed to it. A negative insulating sleeve and a negative O-ring are provided between the negative connection block and the aluminum shell. The negative O-ring is sleeved on the side of the negative current collector to block the electrical connection between the aluminum shell and the negative current collector. A negative insulating structure is provided between the negative current collector and the aluminum shell.

[0011] Preferably, the positive electrode current collector is provided with a first stepped hole extending through it along the axial direction, the diameter of the first stepped hole being larger at the top and smaller at the bottom; the positive electrode cover plate is provided with a second stepped hole extending through it along the axial direction, the diameter of the second stepped hole being larger at the top and smaller at the bottom; and a safety valve is provided inside the second stepped hole.

[0012] Preferably, the positive electrode insulation structure includes a positive electrode O-ring and a positive electrode insulating pad. The aluminum shell is recessed inward to form an annular groove between the positive electrode cover plate and the positive electrode current collector. The positive electrode O-ring is sandwiched between the groove and the positive electrode cover plate, and the positive electrode insulating pad is sandwiched between the positive electrode current collector and the groove.

[0013] Preferably, the positive electrode cover plate and the positive electrode current collector have a surface contact through thermal pressing, and the positive electrode cover plate is made of aluminum.

[0014] Preferably, the safety valve includes a valve body and a valve cap. The valve body is disposed in the second stepped hole and extends axially. The valve cap is partially disposed at the top of the valve body and can move axially along the valve body. A valve cover is disposed on the outer half of the valve cap. The valve cover is interference-fitted with the upper end of the second stepped hole and the valve body. An air pressure hole is provided at the top of the valve cover.

[0015] Preferably, the negative electrode insulation structure includes a negative electrode insulation pad, which is fitted to the negative electrode screw and the aluminum shell to block the electrical connection between the two.

[0016] Preferably, the battery cell is formed by winding a diaphragm, the end face of the battery cell that contacts the positive current collector is aluminum foil, and the end face of the battery cell that contacts the negative current collector is copper foil.

[0017] The above-described solution of the present invention has the following beneficial effects:

[0018] In this application, the positive current collector and the negative current collector are fixed to the battery cell by welding, which enhances the battery's vibration resistance and impact resistance. In addition, the negative current collector and the negative connection block are connected by a negative screw, which simplifies the process and reduces manufacturing and maintenance costs. Attached Figure Description

[0019] Figure 1This is an exploded view of the present invention;

[0020] Figure 2 This is an enlarged cross-sectional view of the positive electrode position of the present invention;

[0021] Figure 3 This is an enlarged cross-sectional view of the negative electrode position of the present invention.

[0022] [Explanation of Labels in the Attached Image]

[0023] 1-Battery cell, 2-Positive electrode, 3-Negative electrode, 4-Aluminum shell, 21-Positive current collector, 22-Positive cover plate, 24-Positive insulating ring, 26-Positive O-ring, 27-Positive insulating pad;

[0024] 31-Negative current collector, 32-Negative screw, 33-Negative connecting block, 34-Negative insulating sleeve, 35-Negative O-ring, 36-Negative insulating pad;

[0025] 25-Safety valve, 251-Valve body, 252-Valve cap, 253-Valve cover. Detailed Implementation

[0026] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0027] like Figure 1-3 As shown, an embodiment of the present invention provides a cylindrical battery with shock and impact resistance, including a cell 1 and a positive electrode 2 and a negative electrode 3 disposed at both ends of the cell 1. The cylindrical battery with shock and impact resistance also includes an aluminum shell 4, which covers the cell 1 and the positive electrode 2 and the negative electrode 3.

[0028] Specifically, the positive electrode 2 includes a positive current collector 21, which is welded to the end face of the battery cell 1 and enclosed within the aforementioned aluminum shell 4. The positive current collector 21 is generally stepped, with its lower part in surface contact with the end face of the battery cell 1. The upper diameter of the positive current collector 21 is smaller than its lower diameter. A positive cover plate 22 is provided on the positive current collector 21, and the positive cover plate 22 fits against the upper curved surface of the positive current collector 21.

[0029] The positive electrode cover plate 22 has concentric annular grooves on the side facing the positive electrode current collector 21. The three concentric annular grooves from the center outward are the first annular groove, the second annular groove, and the third annular groove. The inner wall of the first annular groove is fitted to the upper part of the positive electrode current collector 21 to form a curved surface fit.

[0030] Furthermore, a positive electrode insulation structure is provided between the positive electrode current collector 21 and the positive electrode cover plate 22. This insulation structure ensures that the positive electrode current collector 21 and the positive electrode cover plate 22 can only be electrically connected through the first annular groove and the upper part of the positive electrode current collector 21. The positive electrode cover plate 22 is engaged with the aluminum shell 4. A positive electrode insulating ring 24 is also provided at the engagement point between the positive electrode cover plate 22 and the aluminum shell 4. Preferably, the positive electrode cover plate 22 and the positive electrode current collector 21 are in heat-pressed contact.

[0031] The positive electrode insulation structure includes a positive electrode O-ring 26 and a positive electrode insulating pad 27. The aluminum shell 4 is recessed inward between the positive electrode cover plate 22 and the positive electrode current collector 21 to form an annular groove. The positive electrode O-ring 26 is sandwiched between the groove and the positive electrode cover plate 22, and the positive electrode insulating pad 27 is sandwiched between the positive electrode current collector 21 and the groove.

[0032] The aforementioned negative electrode 3 includes a negative electrode current collector 31, which is welded to the other end face of the battery cell 1. A negative electrode screw 32 is provided on the upper end face of the negative electrode current collector 31. The negative electrode screw 32 passes through the aluminum shell 4 and is screwed to a negative electrode connecting block 33.

[0033] A negative electrode insulating sleeve 34 and a negative electrode O-ring 35 are provided between the negative electrode connecting block 33 and the aluminum shell 4. The negative electrode insulating sleeve 34 is sleeved on the negative electrode screw 32 to block the electrical connection between the aluminum shell 4 and the negative electrode screw 32. A negative electrode insulating structure is provided between the negative electrode current collector 31 and the aluminum shell 4. The negative electrode insulating structure includes a negative electrode insulating pad 36, which is fitted to the negative electrode screw 32 and the aluminum shell 4 to block the electrical connection between them.

[0034] In the aforementioned positive electrode 2, the hot pressing method used in welding increases the contact area between the battery cell 1 and the positive electrode current collector 21, thereby increasing the structural strength.

[0035] In addition, increasing the contact area in positive electrode 2 and negative electrode 3 also reduces resistance, allows it to withstand larger currents, and makes it less likely to generate heat.

[0036] In the aforementioned negative electrode 3, the use of threaded connection simplifies the battery assembly process and reduces manufacturing and maintenance costs.

[0037] The aforementioned battery cell 1 is formed by winding a separator. The end face of battery cell 1 that contacts the positive current collector 21 is aluminum foil, and the end face of battery cell 1 that contacts the negative current collector 31 is copper foil. Of course, battery cell 1 can also be implemented using existing technology, but it should be ensured that one end face is copper foil and the other end face is aluminum foil.

[0038] In one embodiment, the positive electrode current collector 21 has a first stepped hole extending through it axially, with the diameter of the first stepped hole being larger at the top and smaller at the bottom. The positive electrode cover plate 22 has a second stepped hole extending through it axially, with the diameter of the second stepped hole being larger at the top and smaller at the bottom. The first stepped hole and the second stepped hole are coaxial. A safety valve 25 is disposed in the second stepped hole, and the safety valve 25 is interference-fitted with the second stepped hole.

[0039] Specifically, the safety valve 25 includes a valve body 251 and a valve cap 252. The valve body 251 is disposed within a second stepped hole and extends axially. The valve cap 252 is partially surrounded by the top of the valve body 251 and can move axially. A valve cover 253 is also disposed outside the valve cap 252, similarly disposed within the second stepped hole and interference-fitted with it. The valve cover 253 is also partially surrounded by the upper end of the valve body 251, and the valve cap 252 moves axially within the cavity formed by the valve cover 253 and the valve body 251. Furthermore, a pressure port is provided on the valve cover 253.

[0040] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A cylindrical battery with shock and impact resistance, characterized in that: include: The battery cell (1) has a positive electrode (2) and a negative electrode (3) at both ends; An aluminum shell (4) covers the battery cell (1), the positive electrode (2) and the negative electrode (3). The positive electrode (2) includes a positive current collector (21), which is welded to the end face of the battery cell (1) and disposed inside the aluminum shell (4). The positive current collector (21) is stepped, and the lower part of the positive current collector (21) is in contact with the end face of the battery cell (1). The upper diameter of the positive current collector (21) is smaller than the lower diameter of the positive current collector (21). A positive cover plate (22) is disposed on the positive current collector (21), and the positive cover plate (22) is in contact with the upper curved surface of the positive current collector (21). A positive insulation structure is disposed between the positive current collector (21) and the positive cover plate (22). The positive cover plate (22) is engaged with the aluminum shell (4), and a positive insulation ring (24) is filled at the engagement point between the positive cover plate (22) and the aluminum shell (4). The negative electrode (3) includes a negative electrode current collector (31), which is welded to the other end face of the battery cell (1). A negative electrode screw (32) is provided on the upper end face of the negative electrode current collector (31). After the negative electrode screw (32) passes through the aluminum shell (4), a negative electrode connecting block (33) is screwed on. A negative electrode insulating sleeve (34) and a negative electrode O-ring (35) are provided between the negative electrode connecting block (33) and the aluminum shell (4). The negative electrode O-ring (35) is sleeved on the side of the negative electrode screw (32) to block the electrical connection between the aluminum shell (4) and the negative electrode screw (32). A negative electrode insulating structure is provided between the negative electrode current collector (31) and the aluminum shell (4). The positive electrode current collector (21) is provided with a first stepped hole through the axial direction, the diameter of the first stepped hole being larger at the top and smaller at the bottom; the positive electrode cover plate (22) is provided with a second stepped hole through the axial direction, the diameter of the second stepped hole being larger at the top and smaller at the bottom; a safety valve (25) is provided in the second stepped hole. The negative electrode insulation structure includes a negative electrode insulation pad (36), which is fitted to the negative electrode screw (32) and the aluminum shell (4) to block the electrical connection between the two; The battery cell (1) is formed by winding a diaphragm. The end face of the battery cell (1) that contacts the positive current collector (21) is aluminum foil, and the end face of the battery cell (1) that contacts the negative current collector (31) is copper foil.

2. The cylindrical battery with shock and impact resistance according to claim 1, characterized in that: The positive electrode insulation structure includes a positive electrode O-ring (26) and a positive electrode insulating pad (27). The aluminum shell (4) is recessed inward between the positive electrode cover plate (22) and the positive electrode current collector (21) to form an annular groove. The positive electrode O-ring (26) is sandwiched between the groove and the positive electrode cover plate (22), and the positive electrode insulating pad (27) is sandwiched between the positive electrode current collector (21) and the groove.

3. The cylindrical battery with shock and impact resistance according to claim 1, characterized in that: The positive electrode cover plate (22) and the positive electrode current collector (21) are in surface contact by thermal pressing, and the positive electrode cover plate (22) is made of aluminum.

4. The cylindrical battery with shock and impact resistance according to claim 1, characterized in that: The safety valve (25) includes a valve body (251) and a valve cap (252). The valve body (251) is disposed in the second stepped hole and is axially continuous. The valve cap (252) is partially surrounded by the top of the valve body (251) and can move axially along the valve body (251). A valve cover (253) is partially surrounded by the valve cap (252). The valve cover (253) is interference-fitted with the upper end of the second stepped hole and interference-fitted with the valve body (251). A pressure hole is provided at the top of the valve cover (253).

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