Cylindrical battery

Abstract

The utility model relates to the technical field of cylindrical batteries, and discloses a cylindrical battery which comprises a shell, a battery cell, a collector plate and a cap structure, the battery cell is arranged in the shell, tabs are arranged at the two ends of the battery cell in the axis direction, and the polarities of the tabs located at the two ends are opposite; the two current collecting plates are respectively connected with the tabs at the two ends of the battery cell; the number of the cap structures is two, and the two cap structures are connected to the two ends of the shell correspondingly and electrically connected with the two current collecting plates correspondingly. According to the cylindrical battery provided by the utility model, the cap structures at the two ends of the shell can adopt the same material and manufacturing process, unified production can be realized, the manufacturing cost is reduced, circulation steps can be saved in the assembly process, the production process is simplified, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cylindrical battery technical field, concretely relates to cylindrical battery. BACKGROUND

[0002] As an important energy storage and conversion device, batteries are widely used in various electronic devices. Among them, large cylindrical batteries have become the preferred power supply in the field of electric vehicles due to their high energy density and good cycle performance.

[0003] The positive electrode of the large cylindrical battery is usually provided with a 1mm-2mm high boss type positive electrode column, and the positive electrode column is insulatedly connected with the cylindrical shell through an insulating sealing ring. The negative electrode is connected with the battery bottom cover through welding or mechanical bump sealing. In the production process, the production and assembly steps required for the negative electrode and the positive electrode are quite different, and there are many work steps, which leads to low production efficiency. SUMMARY

[0004] Therefore, the utility model provides a cylindrical battery to solve the problem of low production efficiency caused by too many work steps in the production process of the cylindrical battery.

[0005] The utility model provides a cylindrical battery, which comprises:

[0006] A shell;

[0007] An electric core arranged inside the shell, both ends of the electric core in the axial direction are provided with a tab, and the polarity of the tabs at both ends is opposite;

[0008] Two current collecting plates, each of which is connected with the tab at both ends of the electric core;

[0009] Two cap structures, each of which is connected with two current collecting plates at both ends of the shell and is electrically connected with the current collecting plate.

[0010] Beneficial effects: the polarity of the tabs at both ends of the electric core is opposite, so that one end is a positive tab and the other end can be a negative tab. The current collecting plate connected with the positive tab is a positive current collecting plate, and the cap structure connected with the positive current collecting plate forms the positive electrode of the cylindrical battery. The current collecting plate connected with the negative tab is a negative current collecting plate, and the cap structure connected with the negative current collecting plate forms the negative electrode of the cylindrical battery. The cap structures at both ends of the shell can be made of the same material and manufacturing process, and can be produced uniformly, which reduces the manufacturing cost, saves the transfer work steps in the assembly process, simplifies the production process, and improves the production efficiency.

[0011] In an alternative embodiment, the cylindrical battery further comprises an electrically conductive member, the cap structure and the current collector are electrically connected through the electrically conductive member; the electrically conductive member is provided with a fuse part, and the cross-sectional area of the electrically conductive member at the fuse part is smaller than the cross-sectional area of the electrically conductive member at other positions.

[0012] Beneficial effects: the cross-sectional area of the electrically conductive member at the fuse part is smaller than the cross-sectional area of the electrically conductive member at other positions, so that the electrically conductive member is narrowed at the fuse part, and when the current is too large, the electrically conductive member at the fuse part can be fused to cut off the circuit, so that the fuse part plays the role of a fuse, improving the safety performance of the cylindrical battery.

[0013] In an alternative embodiment, the electrically conductive member comprises:

[0014] a flexible electrically conductive sheet, both ends of the length direction of which are connected with the cap structure and the current collector, respectively;

[0015] a fuse notch provided on the side wall of the flexible electrically conductive sheet and located between the cap structure and the current collector, the fuse notch forming the fuse part.

[0016] Beneficial effects: the flexible electrically conductive sheet can be deformed adaptively according to the shape and position of the cap structure and the current collector to ensure the stability of the connection; the fuse notch provided on the side wall of the flexible electrically conductive sheet can realize the narrowing of the flexible electrically conductive sheet to form the fuse part and facilitate the molding.

[0017] In an alternative embodiment, the fuse notch is a semicircular notch provided on the side wall of the flexible electrically conductive sheet.

[0018] In an alternative embodiment, the fuse notch is a rectangular notch provided on the side wall of the flexible electrically conductive sheet.

[0019] In an alternative embodiment, the fuse notch is a triangular notch provided on the side wall of the flexible electrically conductive sheet.

[0020] In an alternative embodiment, the fuse notch is a trapezoidal notch provided on the side wall of the flexible electrically conductive sheet.

[0021] In an alternative embodiment, there are two fuse notches, and the two fuse notches are symmetrically arranged on both sides of the flexible electrically conductive sheet in the width direction.

[0022] Beneficial effects: the two symmetrically arranged fuse notches can further reduce the cross-sectional area of the fuse part, so that the fuse part can be better used as a fuse.

[0023] In an alternative embodiment, the insulating gap is located at the middle of the flexible conductive sheet in the length direction.

[0024] In an alternative embodiment, the side of the cap structure facing away from the battery cell is provided with an explosion-proof valve.

[0025] Beneficial effects: The side of the cap structure facing away from the battery cell is provided with an explosion-proof valve, which prevents the battery from overheating or short-circuiting, thereby avoiding battery explosion or fire, and improving the safety of the battery; since both ends of the cylindrical battery are connected with cap structures, the positive and negative electrodes of the cylindrical battery are both provided with explosion-proof valves, which can improve the safety performance of the battery cell of the cylindrical battery; even if the central hole of the cylindrical battery is blocked, internal pressure relief can be performed in time, avoiding the risk of shell explosion and improving the safety of the cylindrical battery.

[0026] In an alternative embodiment, the explosion-proof valve is at least three explosion-proof notches provided on the cap structure; the at least three explosion-proof notches are distributed at intervals along the circumference of the cap structure.

[0027] Beneficial effects: The structure of the explosion-proof notch is simple and easy to form; the explosion-proof notches distributed at intervals along the circumference can not only enhance the strength of the cap structure, but also achieve the explosion-proof effect and improve the safety of the cylindrical battery.

[0028] In an alternative embodiment, the cap structure comprises:

[0029] an end cover;

[0030] an insulating support provided between the end cover and the current collector, the insulating support being provided with a through hole, one end of the conductive member being connected with the end cover and the other end penetrating through the through hole and being connected with the current collector;

[0031] an insulating ring sleeved on the outer periphery of the end cover and the insulating support, the insulating ring being connected with the shell.

[0032] Beneficial effects: The insulating ring can achieve insulation between the cap structure and the shell; the end cover can be made of conductive material, and the insulating support can not only achieve insulation between the end cover and the current collector, but also facilitate electrical connection between the end cover and the current collector through the through hole.

[0033] In an alternative embodiment, the side of the insulating support facing the current collector is further provided with a reinforcing portion protruding therefrom, the reinforcing portion abutting against the current collector, and the insulating support is further provided with a ventilation opening.

[0034] Beneficial effects: The insulating support is provided with a reinforcing portion protruding from the side facing the current collector, which can form a gap between the insulating support and the current collector; the insulating support is further provided with a ventilation opening, which can ensure that the air passage between the inside of the cylindrical battery and the end cover is unobstructed.

[0035] In an alternative embodiment, the reinforcing part is a reinforcing rib in the shape of a ring, and the vent is arranged in the inner ring of the reinforcing rib.

[0036] Beneficial effects: the reinforcing rib in the shape of a ring can support a relatively stable interval, and the vent arranged in the inner ring of the reinforcing rib can facilitate the communication between the inside of the cylindrical battery and the end cover.

[0037] In an alternative embodiment, the insulating ring is made of elastic material and comprises a ring-shaped body, a first flange and a second flange, the first flange and the second flange are respectively arranged protruding at two ends of the ring-shaped body, and the end cover and the insulating support are located between the first flange and the second flange.

[0038] Beneficial effects: the first flange and the second flange can form a ring-shaped groove with the ring-shaped body to facilitate the fixation of the end cover and the insulating support and play an insulating role.

[0039] In an alternative embodiment, the two ends of the shell are respectively connected with two cap structures by means of bumping and sealing.

[0040] Beneficial effects: the bumping and sealing connection can realize the sealed connection between the two ends of the shell and the cap structures. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0042] Figure 1 A schematic diagram of a cylindrical battery according to an embodiment of the present application;

[0043] Figure 2 An installation explosion diagram of a cylindrical battery according to an embodiment of the present application;

[0044] Figure 3 A schematic diagram of a cap structure according to an embodiment of the present application;

[0045] Figure 4 A schematic diagram of an end cover according to an embodiment of the present application;

[0046] Figure 5 A schematic diagram of an insulating support according to an embodiment of the present application;

[0047] Figure 6A schematic view of a conductive part according to an embodiment of the present application;

[0048] Figure 7 Another schematic view of a conductive part according to an embodiment of the present application;

[0049] Figure 8 Still another schematic view of a conductive part according to an embodiment of the present application;

[0050] Figure 9 Still another schematic view of a conductive part according to an embodiment of the present application.

[0051] Explanation of reference signs:

[0052] 1, shell; 2, battery cell; 3, current collector plate; 4, cap structure; 41, explosion-proof valve; 42, end cover; 43, insulating support; 431, reinforcing portion; 432, ventilation opening; 44, insulating ring; 5, conductive part; 51, flexible conductive sheet; 52, safety notch. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0054] The embodiments of the present application will be described below in conjunction with Figures 1 to 9

[0055] According to the embodiments of the present application, a cylindrical battery is provided, which comprises a shell 1, a battery cell 2, a current collector plate 3 and a cap structure 4. The battery cell 2 is arranged inside the shell 1, both ends of the battery cell 2 in the axial direction are provided with a tab, and the polarity of the tabs at both ends is opposite. The current collector plate 3 has two, and the two current collector plates 3 are connected with the tabs at both ends of the battery cell 2 respectively. The cap structure 4 has two, and the two cap structures 4 are connected at both ends of the shell 1 respectively and are electrically connected with the two current collector plates 3 respectively.

[0056] ​The polarities of the tabs at both ends of the battery cell 2 are opposite, so that one end is a positive tab and the other end can be a negative tab; the current collector plate 3 connected with the positive tab is a positive current collector plate 3, and the cap structure 4 connected with the positive current collector plate 3 forms a positive electrode of the cylindrical battery; the current collector plate 3 connected with the negative tab is a negative current collector plate 3, and the cap structure 4 connected with the negative current collector plate 3 forms a negative electrode of the cylindrical battery; the cap structures 4 at both ends of the shell 1 can be made of the same material and manufacturing process, and can be produced uniformly, thereby reducing the manufacturing cost, saving the flow steps in the assembly process, simplifying the production process, and improving the production efficiency.

[0057] In a specific embodiment, the shell 1 is made of a metal material. In a preferred embodiment, the shell 1 is a steel shell.

[0058] In one embodiment, the cylindrical battery further comprises an electrically conductive piece 5, the cap structure 4 and the current collector plate 3 are electrically conductively connected through the electrically conductive piece 5; the electrically conductive piece 5 is provided with a fuse part, and the cross-sectional area of the electrically conductive piece 5 at the fuse part is smaller than the cross-sectional area of the electrically conductive piece 5 at other positions.

[0059] The cross-sectional area of the electrically conductive piece 5 at the fuse part is smaller than the cross-sectional area of the electrically conductive piece 5 at other positions, so that the electrically conductive piece 5 is narrowed at the fuse part, and when the current is too large, the electrically conductive piece 5 at the fuse part can be fused to cut off the circuit, so that the fuse part plays the role of a fuse, thereby improving the safety performance of the cylindrical battery.

[0060] In one embodiment, the electrically conductive piece 5 comprises a flexible conductive sheet 51 and a fuse notch 52; the two ends of the flexible conductive sheet 51 in the length direction are respectively connected with the cap structure 4 and the current collector plate 3; the fuse notch 52 is arranged on the side wall of the flexible conductive sheet 51 and located between the cap structure 4 and the current collector plate 3, and the fuse notch 52 forms the fuse part.

[0061] The flexible conductive sheet 51 can be deformed adaptively according to the shape and position of the cap structure 4 and the current collector plate 3 to ensure the connection stability; the fuse notch 52 arranged on the side wall of the flexible conductive sheet 51 can realize the narrowing of the flexible conductive sheet 51 to form the fuse part and facilitate the molding.

[0062] As a convertible embodiment, the fuse part can also be a through hole arranged on the flexible conductive sheet 51.

[0063] In one embodiment, the fuse notch 52 is a semicircular notch arranged on the side wall of the flexible conductive sheet 51.

[0064] In one embodiment, the fuse notch 52 is a rectangular notch arranged on the side wall of the flexible conductive sheet 51.

[0065] In one embodiment, the safety notch 52 is a triangular notch arranged on the side wall of the flexible conductive sheet 51.

[0066] In one embodiment, the safety notch 52 is a trapezoidal notch arranged on the side wall of the flexible conductive sheet 51.

[0067] As a convertible embodiment, the safety notch 52 can also be an irregularly shaped notch arranged on the side wall of the flexible conductive sheet 51.

[0068] In one embodiment, the safety notch 52 has two, and the two safety notches 52 are symmetrically arranged on both sides of the flexible conductive sheet 51 along the width direction.

[0069] The two symmetrically arranged safety notches 52 can further reduce the cross-sectional area of the safety part, so that the safety part can be better used as a fuse.

[0070] In one embodiment, the safety notch 52 is located at the middle position of the flexible conductive sheet 51 along the length direction.

[0071] In one embodiment, the side of the cap structure 4 away from the battery cell 2 is provided with an explosion-proof valve 41.

[0072] The side of the cap structure 4 away from the battery cell 2 is provided with an explosion-proof valve 41, which prevents the battery from overheating or short-circuiting, thereby avoiding the explosion or fire of the battery and improving the safety of the battery; Since both ends of the cylindrical battery are connected with the cap structure 4, the positive electrode and the negative electrode of the cylindrical battery are both provided with the explosion-proof valve 41, which can improve the safety performance of the battery cell 2 of the cylindrical battery. Even if the center hole of the cylindrical battery is blocked, the internal pressure relief can be performed in time, avoiding the risk of explosion of the shell 1 and improving the safety of the cylindrical battery.

[0073] In one embodiment, the explosion-proof valve 41 is at least three explosion-proof notches arranged on the cap structure 4; the at least three explosion-proof notches are distributed along the circumference of the cap structure 4.

[0074] The explosion-proof notch has a simple structure and is easy to form.

[0075] The circumferentially spaced explosion-proof notches can not only enhance the strength of the cap structure 4, but also achieve the explosion-proof effect and improve the safety of the cylindrical battery.

[0076] Preferably, the at least three explosion-proof notches are uniformly distributed along the circumference of the cap structure 4.

[0077] In one embodiment, the cap structure 4 comprises an end cover 42, an insulating support 43 and an insulating ring 44; the insulating support 43 is arranged between the end cover 42 and the current collector 3, the insulating support 43 is provided with a through hole, one end of the conductive part 5 is connected with the end cover 42, and the other end passes through the through hole and is connected with the current collector 3; the insulating ring 44 is sleeved on the outer periphery of the end cover 42 and the insulating support 43, and the insulating ring 44 is connected with the shell 1.

[0078] The insulating ring 44 can realize the insulation between the cap structure 4 and the shell 1; the end cover 42 can be made of conductive material, and the insulating support 43 can realize the insulation between the end cover 42 and the current collector 3, and facilitate the electrical connection between the end cover 42 and the current collector 3 through the through hole.

[0079] In one embodiment, the side of the insulating support 43 towards the current collector 3 is further provided with a reinforcing portion 431 abutting against the current collector 3, and the insulating support 43 is further provided with a ventilation opening 432.

[0080] The reinforcing portion 431 is provided on the insulating support portion and protrudes towards the side of the current collector 3, so as to form a gap between the insulating support 43 and the current collector 3, and the ventilation opening 432 is further provided on the insulating support 43, so as to ensure that the air passage between the inside of the cylindrical battery and the end cover 42 is unobstructed.

[0081] In one embodiment, the reinforcing portion 431 is a reinforcing rib in the form of a ring, and the ventilation opening 432 is arranged in the inner ring of the reinforcing rib.

[0082] The reinforcing rib in the form of a ring can support a relatively stable gap, and the ventilation opening 432 is arranged in the inner ring of the reinforcing rib, so as to facilitate the communication between the inside of the cylindrical battery and the end cover 42.

[0083] In a preferred embodiment, the position of the ventilation opening 432 can be arranged corresponding to the anti-explosion notch. The ventilation opening 432 has at least three, and the at least three ventilation openings 432 are distributed along the circumference of the insulating support 43, preferably uniformly distributed.

[0084] In one embodiment, the insulating ring 44 is made of elastic material and comprises a ring-shaped body, a first flange and a second flange, the first flange and the second flange are respectively arranged protruding at two ends of the ring-shaped body, and the end cover 42 and the insulating support 43 are located between the first flange and the second flange.

[0085] The first flange and the second flange can form a ring-shaped groove with the ring-shaped body, so as to facilitate the fixation of the end cover 42 and the insulating support 43, and play the role of insulation.

[0086] In one embodiment, the two ends of the shell 1 are respectively connected with two cap structures 4 through sealing.

[0087] Through the sealing connection, the sealing connection between the two ends of the shell 1 and the cap structure 4 is realized.

[0088] In this embodiment, the manufacturing process of the cylindrical battery includes: connecting the end cover 42, the insulating support 43 and the insulating ring 44 to form the cap structure 4, then welding the end cover 42 of the positive electrode and the current collector disc 3 of the positive electrode through the conductive piece 5, welding the end cover 42 of the negative electrode and the current collector disc 3 of the negative electrode, realizing the connection of the cap structure 4 at the two ends of the battery cell 2; then arranging the connected battery cell 2 and the cap structure 4 in the shell 1, sealing the two ends of the shell 1, realizing the assembly of the cylindrical battery.

[0089] Although the embodiments of the present application are described in combination with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and variations all fall within the scope defined by the present application.

Claims

1. A cylindrical battery, characterized by comprising: The application relates to a battery cell, which comprises the following parts: a shell (1); an electric core (2) arranged in the shell (1), the electric core (2) being provided with a tab at each end along the axial direction, and the polarity of the tabs at the two ends being opposite; two current collecting plates (3), each of which is connected to the tab at one end of the electric core (2); two cap structures (4), each of which is connected to one end of the shell (1) and is electrically connected to one of the current collecting plates (3).

2. The cylindrical battery according to claim 1, characterized by, The battery cell further comprises a conductive part (5), the cap structure (4) and the current collecting plate (3) are electrically connected through the conductive part (5), the conductive part (5) is provided with a fuse part, and the cross-sectional area of the conductive part (5) at the fuse part is smaller than the cross-sectional area of the conductive part (5) at other positions.

3. The cylindrical battery according to claim 2, characterized by The conductive part (5) comprises: a flexible conductive sheet (51), the two ends of the flexible conductive sheet (51) in the length direction are connected to the cap structure (4) and the current collecting plate (3) respectively; a fuse notch (52) arranged on the side wall of the flexible conductive sheet (51) and located between the cap structure (4) and the current collecting plate (3), the fuse notch (52) forming the fuse part.

4. The cylindrical battery according to claim 3, characterized by The fuse notch (52) is a semicircular notch arranged on the side wall of the flexible conductive sheet (51); and / or, the fuse notch (52) is a rectangular notch arranged on the side wall of the flexible conductive sheet (51); and / or, the fuse notch (52) is a triangular notch arranged on the side wall of the flexible conductive sheet (51); and / or, the fuse notch (52) is a trapezoidal notch arranged on the side wall of the flexible conductive sheet (51); and / or, the fuse notch (52) has two fuse notches (52) arranged symmetrically on the two sides of the flexible conductive sheet (51) in the width direction.

5. The cylindrical battery according to claim 1, wherein The side of the cap structure (4) away from the electric core (2) is provided with an explosion-proof valve (41).

6. The cylindrical battery according to claim 5, characterized by The explosion-proof valve (41) is at least three explosion-proof notches arranged on the cap structure (4), and the at least three explosion-proof notches are distributed at intervals along the circumferential direction of the cap structure (4).

7. The cylindrical battery according to any one of claims 2 to 4, characterized by, The cap structure (4) comprises: an end cover (42); an insulating support (43) arranged between the end cover (42) and the current collecting plate (3), the insulating support (43) being provided with a through hole, one end of the conductive part (5) being connected to the end cover (42) and the other end of the conductive part (5) penetrating through the through hole and being connected to the current collecting plate (3); an insulating ring (44) sleeved on the outer periphery of the end cover (42) and the insulating support (43), the insulating ring (44) being connected to the shell (1).

8. The cylindrical battery according to claim 7, characterized by The side of the insulating support (43) facing the current collecting plate (3) is further provided with a reinforcing part (431) protruding therefrom, the reinforcing part (431) abutting against the current collecting plate (3), and the insulating support (43) is further provided with a ventilation opening (432).

9. The cylindrical battery according to claim 8, characterized by The reinforcing part (431) is a reinforcing rib in the form of a ring, and the ventilation opening (432) is arranged in the inner ring of the reinforcing rib.

10. The cylindrical battery according to claim 7, characterized by The insulating ring (44) is made of elastic material, comprising a ring-shaped body, a first flange and a second flange, the first flange and the second flange are respectively arranged at both ends of the ring-shaped body, and the end cover (42) and the insulating support (43) are located between the first flange and the second flange. And / or, the two ends of the shell (1) are respectively connected with two cap structures (4) in a sealing manner.

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