Power battery

Abstract

The utility model provides a safe and reliable power battery, which is characterized in that two positive and negative terminals (5) of the battery consist of screw hole cores (51), conductive reinforcing rings (52) and insulating sleeve columns (53), are firmly connected with a top cover (11), and are applied to mounting components of the battery (100); the shell tube (1) and the top cover (11) are connected by adopting high structural strength to form a battery cell shell with an opening at the tail end, the battery cell (4) is loaded from the opening and then is blocked by the tail cover (3), the blocking strength of the tail cover (3) is lower than that of the top cover (11), and only the tail cover (3) can be jacked open when the internal high pressure is high, so that the overall safety is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a columnar battery with high power and high capacity density (such as a lithium battery). Technical Background

[0002] Lithium-ion batteries have high capacity density and are prone to explosion risks, and their safety issues have always received widespread attention. The main cause of explosions is internal heating and heat dissipation problems during battery use, which causes the internal temperature of the battery cell to rise above the safe temperature. Therefore, the heat dissipation design of the battery is very important. Large-capacity battery packs are composed of hundreds, thousands or even tens of thousands of individual batteries, and the quality of all batteries cannot be guaranteed to be absolutely reliable. Therefore, it is also very important to reduce the explosion intensity caused by excessive temperature expansion inside the battery cell and reduce the possibility of a single defective battery affecting adjacent batteries and causing a larger accident.

[0003] Chinese patent CN201720241527 discloses a hollow cylindrical battery, a good battery heat dissipation structure design, but the solution disclosed in the patent does not take into account the structural strength of the battery itself, and if a single battery cell exceeds the temperature and burns or explodes, how to prevent adjacent batteries from igniting, and there is also the structural cost of the battery pack. Summary of the invention

[0004] The utility model provides a columnar battery, which proposes a solution to the above-mentioned deficiencies in the prior art.

[0005] The technical scheme of the utility model battery is as follows: the battery comprises: a battery cell, a shell tube, a top cover, a tail cover, a terminal and a terminal board, the two terminals are the two positive and negative electrodes of the battery, the terminal comprises a screw hole core and a conductive ring sleeve and an insulating sleeve column, the tail end of the screw hole core comprises a boss connected to the terminal board; the shell tube and the top cover constitute a battery cell shell with structural strength and one end opening, the battery cell is loaded from the opening, and then the tail cover is used to cover the opening, the strength of the tail cover blocking the opening (the tail end of the battery cell shell) is lower than the strength of the top cover of the battery cell shell, when the internal high voltage is applied, only the tail cover can be pushed open; the terminal board is arranged in the battery cell shell, and is electrically connected to the battery cell, the top cover is provided with a hole extending from the screw hole core, the conductive ring sleeve comprises a sleeve and a ring sheet, the sleeve and the ring sheet are a metal integrated structure (thin wall), the sleeve is sleeved with the screw hole core, the insulating sleeve column is sleeved with the sleeve, one end of the insulating sleeve column is attached to the top cover, and the other end is pressed by the ring sheet of the conductive ring sleeve, and the terminal is also used as a mounting and fixing component of the battery;

[0006] The structure of the battery cell shell adopts: the shell tube is made of a seamed metal tube, the plate material of the top cover comes from the tube material of the shell tube and is made by a diameter reduction process, the top cover and the shell tube constitute an integrated structure, or the top cover and the shell tube are connected by an interlocking structure; or, the shell tube and the top cover are an integrated structure made of metal plates by a stretching process. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The following will clearly and completely describe the implementation of the present invention in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0008] Figure 1 The utility model is a characteristic cross-sectional schematic diagram of a battery.

[0009] Figure 2 yes Figure 1 A top view of

[0010] Figure 3 , Figure 4 The following are characteristic cross-sectional diagrams of two types of batteries of the utility model:

[0011] Figure 5 It is a characteristic cross-sectional schematic diagram of the battery cell in the utility model.

[0012] Figure 6 yes Figure 5 A top view schematic diagram of .

[0013] Figure 7 The utility model is a characteristic cross-sectional schematic diagram of the battery cell shell.

[0014] Figure 8 , Fig. 9 , Fig.10 , Fig.11 They are four characteristic plane schematic diagrams of the battery of the utility model when assembled.

[0015] In the figure: 100, battery, 101, battery cell shell, 1, shell tube, 11, top cover, 2, hollow tube, 21, outer flange, 22, outer expansion edge, 3, tail cover, 31, outer edge sleeve, 311, outer edge inner edge, 32, inner edge sleeve, 321, inner edge inner edge, 4, battery cell, 41, end face spacer, 42, bottom gasket, 43, battery cell electrode, 431, electrode one, 432, electrode two, 433, electrode three, 434, electrode four, 44, battery cell jacket, 441, outer edge shrinkage, 5, terminal, 51, screw core, 511, boss, 52, conductive ring sleeve, 521, sleeve, 522, ring sheet, 53, insulating sleeve column, 54, terminal board, 55, sealing ring. DETAILED DESCRIPTION

[0016] Figure 1In the battery of the utility model shown, the outer shell tube 1 and the top cover 11 (i.e., the battery cell housing 101) are an integral structure made of metal sheet through a stretching process, so that the outer shell tube 1 and the top cover 11 form a battery cell housing 101 with structural strength and an opening at one end, and the battery cell 4 is loaded from the opening, and then the tail end is sealed by the tail cover 3. The strength of the tail cover 3 blocking the tail end is lower than the strength of the top cover of the battery cell housing. When the internal high pressure is high, only the tail cover 3 can be opened, which is conducive to safety and reliability; the tail cover 3 should be provided with a pressure relief valve to reduce the possibility of internal high pressure, which is safer and more reliable. The metal plate of the battery cell housing 101 can be a thin-walled aluminum plate, a stainless steel plate, or a steel plate with surface protection treatment (such as galvanized / aluminum / nickel).

[0017] Figure 1 In the embodiment, the terminal board 54 is arranged in the battery cell housing 101, and should be made of insulating material, and a sealing structure should be arranged between the terminal board 54 and the battery cell housing 101. A sealing structure should be arranged between the tail cover 3 and the battery cell housing 101, so as to solve the sealing problem of the battery cell, and the sealing structure can be made of sealant. The protection circuit mechanism of the battery 100 for overcurrent / overvoltage (overcharge) / overtemperature, etc. should be arranged on the terminal board 5. As shown in the figure, the rear end of the screw hole core (51) contains a boss (511) connected to the terminal plate (54), the screw hole core (51) extends out of the hole opened on the top cover (11), the boss (511) at the rear end of the screw hole core (51) is clamped in the core shell 101, the sleeve (521) of the conductive ring sleeve (52) is sleeved on the screw hole core (51), and the insulating sleeve column (53) is sleeved on the sleeve (521), one end of the insulating sleeve column (53) is attached to the top cover (11), and the other end is buckled by the ring sheet (522) of the conductive ring sleeve (52), so that the terminal 5 has high stability and strength, and can be both the positive and negative poles of the battery 100 and can be used as an installation and fixing component of the battery (100).

[0018] Figure 1 In the figure, the tail cover 3 has an outer edge sleeve 31, which can be made of a metal plate through a stamping process, flanging and stretching. The outer edge sleeve 31 is sleeved outside the outer shell tube 1. The rigidity strength of the metal plate of the tail cover 3 should be higher than that of the outer shell tube 1. The impact resistance of the tail end of the battery cell shell 101 is borne by the tail cover 3.

[0019] Figure 2 As shown, the insulating sleeves 53 of the two terminals 5 have different shapes. The insulating sleeve 53 of the left terminal 5 is round, and the insulating sleeve 53 of the right terminal 5 is square. In this way, the positive and negative poles of the two terminals 5 are not easily misplaced during use and installation.

[0020] Figure 3In the battery of the utility model shown in the figure, the outer shell tube 1 adopts a hollow tube column structure, the top of the hollow tube 2 has an outer flange 21, the tube material from the hollow tube 2 is expanded and turned outward, and the outer flange 21 and the top cover 11 can be welded by resistance welding; the tail cover 3 has a central through hole connected to the hollow tube 2, and the heat dissipation air can flow in the hollow tube 2, thereby improving the heat dissipation of the battery. In the figure, the tail cover 3 has an inner edge sleeve 32 sleeved on the outside of the hollow tube 2, and the tail end of the hollow tube 2 has an outer expansion edge 22.

[0021] Figure 3 In the embodiment, two battery cells 4 are provided with an end spacer 41 between them. The end spacer 41 should be made of fire-retardant and heat-insulating material (such as asbestos). There should be a conductive connection between the two battery cells 4. A bottom gasket 42 is provided at the tail end, which should be made of heat-insulating material.

[0022] The outer shell tube 1 and the hollow tube 2 can also be made of seamed metal tubes, such as thin-walled seamed aluminum tubes, stainless steel tubes, and steel tubes with surface protection treatment (such as galvanized / aluminum / nickel). The plate material of the top cover 11 comes from the tube material of the outer shell tube 1 and is made by a diameter reduction process. The top cover 11 and the outer shell tube 1 constitute an integrated structure.

[0023] Figure 4 The battery of the utility model shown in the figure, the outer shell tube 1 and the top cover 11 and the hollow tube 2 (i.e. the battery shell 101 formed) are an integrated structure made of metal plates through a stretching process; three battery cells 4 are arranged in the battery shell 101, and there should be no less than two in the design, and the end faces of the battery cells 4 are provided with battery cell electrodes 43, and the two battery cells are connected by contacting and conducting through the corresponding battery cell electrodes on the end faces, and the terminal plate 5 should have corresponding contacting conductive electrodes, and conductive glue / paste can be used to improve the contacting conductive performance. As shown in the figure, a sealing ring 55 is arranged on the outer ring of the ring piece 522 of the terminal 5.

[0024] Figure 4 In the figure, the tail cover 3 is made of metal plate by a stamping process. The metal plate can be a thin-walled aluminum plate, a stainless steel plate, or a steel plate with surface protection treatment (such as galvanized / aluminum / nickel). The outer edge of the tail cover 3 has an outer edge inner edge 311, and the tail end of the outer shell tube 1 is clamped between the outer edge inner edge 311 and the outer edge sleeve 31. The inner edge of the tail cover 3 has an inner edge inner edge 321, and the tail end of the hollow tube 2 is clamped between the inner edge inner edge 321 and the inner edge sleeve 32. The existence of the outer edge inner edge 311 and the inner edge inner edge 321 can improve the rigidity of the tail cover 3 and the impact resistance of the tail end of the battery cell shell 101. The tail end of the battery cell shell 101 can be directly exposed without the protection of a protective baffle.

[0025] Figure 5 and Figure 6In the battery cell of the utility model shown in the figure, there are two battery cell electrodes on both end faces of the battery cell 4, namely: electrode one 431, electrode two 432, electrode three 433, electrode four 434. If the battery cells in the battery cell shell 101 are connected in series, electrode two 432 and electrode four 434 are connected electrodes (polar), and electrode one 431 and electrode three 433 are two positive and negative electrodes. If they are connected in parallel, electrode two 432 and electrode four 434 are the same electrode, and electrode one 431 and electrode three 433 are the same electrode. In the figure, the core jacket 44 of the battery cell 4 has a reduced diameter at both ends, forming an outer edge reduction 441 that clamps the end face spacers 41 at both ends, and the core jacket 44 can be made of a heat shrink tube.

[0026] Figure 7 In the battery cell housing 101 of the present invention, the top cover 11 and the outer shell tube 1 are connected by an interlocking structure, and the top cover 11 and the hollow tube 2 are also connected by an interlocking structure. The outer shell tube 1 and the hollow tube 2 can be made of seamed metal tubes.

[0027] Figure 8 In the utility model shown, the hollow tube 2 is circular, and the outer shell tube 1 is also circular. Fig. 9 In the utility model shown, the hollow tube 2 is a hexagon (a regular hexagon in the figure), and the outer shell tube 1 is a hexagon with rounded corners. Fig.10 In the utility model shown, the hollow tube 2 is a quadrilateral with chamfered straight corners (can also be considered as an octagon), and the outer shell tube 1 is an octagon with rounded corners. Fig.11 In the utility model shown, the hollow tube 2 is a quadrilateral with rounded corners (a square in the figure), and the outer shell tube 1 is a quadrilateral with rounded corners. Regardless of the shape, the circumferential spacing D between the outer shell tube 1 and the hollow tube 2 should be consistent. The diameter of the outer shell tube 1 (the maximum diagonal dimension when it is not round) should be no less than 30 mm, and more reasonably greater than 40 mm and less than 70 mm.

[0028] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A battery, comprising: a housing tube (1), a top cover (11), a tail cover (3), a battery cell (4), a terminal (5) and a terminal plate (54), characterized in that: The terminal (5) comprises a screw hole core (51), a conductive ring sleeve (52) and an insulating sleeve column (53); the screw hole core (51) has a boss (511) at the rear end connected to a terminal plate (54); the outer shell tube (1) and the top cover (11) form a battery cell shell (101) with an opening at one end; the battery cell (4) is loaded from the opening, and then the opening is sealed by the tail cover (3); the terminal plate (54) is arranged in the battery cell shell (101) and is electrically connected to the battery cell (4). The top cover (11) is provided with a hole through which the screw core (51) extends, the sleeve (521) of the conductive ring sleeve (52) is sleeved on the screw core (51), the insulating sleeve column (53) is sleeved on the sleeve (521), one end of the insulating sleeve column (53) is attached to the top cover (11), and the other end is pressed by the ring sheet (522) of the conductive ring sleeve (52), and the terminal (5) is used as a mounting and fixing component of the battery (100); the battery cell housing (101) adopts the following structure: The outer shell tube (1) is made of a seamed metal tube, the plate material of the top cover (11) is made from the tube material of the outer shell tube (1) and is made by a diameter reduction process, the top cover (11) and the outer shell tube (1) form an integral structure, or the top cover (11) and the outer shell tube (1) are connected by an interlocking structure; Alternatively, the outer shell tube (1) and the top cover (11) are an integral structure made of metal plates through a stretching process.

2. The battery according to claim 1, characterized in that: No less than two battery cells (4) are arranged in the battery cell housing (101), and an end face spacer (41) is arranged between the two battery cells.

3. The battery according to claim 2, characterized in that: The cell electrodes (43) of the cell (4) are arranged on the outer side of the end face spacer (41), and the electrical connection between the two cell elements is achieved through the contact and conductive connection of the corresponding cell electrodes on the end faces of the two cell elements.

4. The battery according to claim 3, characterized in that: The core jacket (44) of the battery core (4) has reduced diameters at both ends, forming outer edge reduced edges (441) of the end face spacers (41) sandwiching the two ends.

5. The battery according to claim 1, characterized in that: The tail cover (3) is made of a metal plate and is provided with an outer edge sleeve (31), and the outer edge sleeve (31) is sleeved outside the outer shell tube (1).

6. The battery according to claim 5, characterized in that: The outer edge of the tail cover (3) has an outer edge inner edge (311), and the tail end of the outer shell tube (1) is clamped between the outer edge inner edge (311) and the outer edge sleeve edge (31).

7. The battery according to claim 1 or 2 or 3 and 4 or 5 or 6, characterized in that: A hollow tube (2) is provided, the battery core (4) adopts a central through-hole structure, the tail cover (3) has a central through-hole communicating with the hollow tube (2), the hollow tube (2) and the top cover (11) are connected by welding or an interlocking structure, or the hollow tube (2) and the top cover (11) adopt an integrated structure made of metal plates through a stretching process.

8. The battery according to claim 7, characterized in that: The tail cover (3) is made with an inner edge sleeve (32), and the inner edge sleeve (32) is sleeved outside or inside the hollow tube (2).

9. The battery according to claim 8, characterized in that: The inner edge of the tail cover (3) has an inner edge (321), and the tail end of the hollow tube (2) is clamped between the inner edge (321) and the inner edge sleeve (32).

10. The battery according to claim 1 or 2 or 3 and 4 or 5 or 6 or 8 or 9, characterized in that: A sealing ring (55) is arranged on the outer ring of the ring piece (522) of the terminal (5).

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