Power battery

Abstract

The utility model discloses a power battery which comprises a shell, a cover body, a roll core, a current collecting disc and an annular ferrule, the roll core, the current collecting disc and the annular ferrule are arranged in the shell, the current collecting disc comprises a disc-shaped body and a bending part which is bent upwards from the edge of the disc-shaped body, the annular ferrule is sleeved on the outer surface of the bending part and is fixedly connected with the current collecting disc, and the annular ferrule is arranged in the shell. The material of the annular ferrule is the same as that of the shell; the disc-shaped body is welded and connected with a full tab at one end of the roll core, the cover body seals the opening of the shell, and the cover body, the shell and the annular ferrule are welded and connected into a whole. According to the utility model, the bending part is arranged at the edge of the current collecting plate, the annular ferrule is arranged at the periphery of the bending part, and the annular ferrule, the shell and the cover body are welded and connected into a whole, so that the problems of safety risks such as cracks and liquid leakage at the welding part caused by different materials of the current collecting plate and the shell in the prior art are effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field especially relates to a power battery. BACKGROUND

[0002] In the existing cylindrical battery production technology, the current collector plate is usually used to connect the pole lug of the winding core and the shell, or the current collector plate is used to connect the pole lug and the cover plate, so as to realize the communication of the current and the winding core pole piece inside the battery, and the charging and discharging application, but the following problems exist:

[0003] 1. When the current collector plate is connected with the shell or the cover plate outside, the material of the current collector plate is usually different from the material of the shell and the cover plate. When different materials are welded, cracks are easy to appear at the welding position, liquid leakage and other safety risks occur, and the problem of damage to the winding core cannot be avoided when the shell bottom penetrates the welding current collector plate assembly, and the welding of different metals is not firm, which is easy to fall off, resulting in the risk of open circuit failure of the battery.

[0004] 2. When the current collector plate is connected with the cover plate inside, the assembly sealing and fixing need to bend the extension handle of the current collector plate, which causes the current collector plate to form a spring type overcurrent connection structure. In the charging and discharging process, the cover plate and the winding core bear a large stress, which causes the battery to produce liquid leakage and bursting risk, the safety performance is poor, and there is a risk of collapse at the bending position, which causes the occurrence of sharp end discharge, further increases the failure risk, and the bending position occupies the electrolyte storage space, which is not conducive to the long cycle battery.

[0005] It can be seen that the above two process structures have the disadvantages that cannot be avoided and solved. SUMMARY

[0006] The utility model aims at providing a power battery to solve the problem that the material of the current collector plate is different from the shell in the prior art, which causes cracks to appear at the welding position, liquid leakage and other safety risks.

[0007] In order to achieve the above purpose, the utility model provides a power battery, which comprises a shell, a cover, a winding core, a current collector plate and an annular ring, the winding core, the current collector plate and the annular ring are arranged in the interior of the shell, the current collector plate comprises a disc-shaped body and a bending part which is bent upwards from the edge of the disc-shaped body, the annular ring is sleeved on the outer surface of the bending part and is fixedly connected with the current collector plate, the material of the annular ring is the same as that of the shell, the disc-shaped body is welded and connected with the full pole lug at one end of the winding core, and the cover closes the opening of the shell and is welded and connected with the shell and the annular ring as a whole.

[0008] Preferably, the angle between the bending part and the disc-shaped body is greater than 90 degrees and less than or equal to 120 degrees.

[0009] Preferably, the annular collar is laser welded, riveted or ultrasonic welded to the current collector plate.

[0010] Preferably, the annular collar has an L-shaped cross section and comprises a vertical portion and a horizontal portion connected to the vertical portion, the disc-shaped body comprises an edge portion and a downwardly recessed intermediate groove portion, the vertical portion is sleeved on the outer surface of the bent portion and the horizontal portion is attached to the lower surface of the edge portion, the edge portion is laser welded, riveted or ultrasonic welded to the horizontal portion, and the intermediate groove portion is welded to the full tab at one end of the winding core.

[0011] Preferably, the upper surface of the annular collar is higher than the upper surface of the bent portion, the upper surface of the shell is higher than the upper surface of the annular collar, the edge of the cover body is provided with a first step portion, the first step portion is mounted on the annular collar and the lower bottom surface of the cover body is overlapped with the upper surface of the bent portion, and the outer side surface of the upper portion of the cover body is abutted with the inner wall of the shell.

[0012] Preferably, the shell, the cover body and the annular collar have a first connecting gap therebetween, and the shell, the cover body and the annular collar are welded at the first connecting gap.

[0013] Preferably, the upper surface of the annular collar is higher than the upper surface of the bent portion, the upper surface of the shell is flush with the upper surface of the annular collar, the edge of the cover body is provided with a second step portion, the second step portion is overlapped on the annular collar and the shell, and the lower bottom surface of the cover body is overlapped with the upper surface of the bent portion.

[0014] Preferably, the second step portion has a second connecting gap between the shell and the annular collar, and the cover body, the shell and the annular collar are welded at the second connecting gap.

[0015] Preferably, a liquid storage compartment is formed between the disc-shaped body and the cover body.

[0016] Preferably, the shell, the cover body and the annular collar are made of steel.

[0017] Compared with the prior art, the annular collar is provided on the edge of the current collector plate and the annular collar is welded to the shell and the cover body, thereby effectively avoiding the problem that the material of the current collector plate is different from the material of the shell in the prior art, which causes cracks and liquid leakage at the welding position. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1The utility model discloses a structure diagram of power battery.

[0019] Figure 2 The utility model discloses a structure diagram of current collecting disc in power battery.

[0020] Figure 3 The utility model discloses a structure diagram of current collecting disc in power battery.

[0021] Figure 4 The utility model discloses a structure diagram of current collecting disc in power battery.

[0022] Figure 5 The utility model discloses a structure diagram of current collecting disc in power battery.

[0023] Figure 6 The utility model discloses a structure diagram of current collecting disc in power battery.

[0024] Figure 7 The utility model discloses a structure diagram of current collecting disc in power battery.

[0025] Figure 8 The utility model discloses a structure diagram of current collecting disc in power battery.

[0026] Figure 9 The utility model discloses a structure diagram of current collecting disc in power battery. Figure 8 The utility model discloses a structure diagram of current collecting disc in power battery.

[0027] Figure 10 The utility model discloses a structure diagram of current collecting disc in power battery.

[0028] Figure 11 The utility model discloses a structure diagram of current collecting disc in power battery. Specific embodiment

[0029] For the technical content, construction features of the utility model, the effect realized, the following is in detail with the embodiment and cooperates the drawing to explain.

[0030] For example, Figures 1 to 11As shown in the utility model embodiment provides a kind of power battery 10, including shell 1, cover 2, roll core 5, current collector plate 3 and annular collar 4, roll core 5, current collector plate 3 and annular collar 4 are located in the inside of shell 1, current collector plate 3 includes disc body 31 and the bending portion 32 that is bent upwards by the edge of disc body 31, annular collar 4 is sleeved on the outer surface of bending portion 32 and is fixedly connected with current collector plate 3, the material of annular collar 4 is same with the material of shell 1;Disc body 31 is welded with one end of roll core 5 and is connected with full tab, cover 2 closes the opening of one end of shell 1 and cover 2 and shell 1 and annular collar 4 are welded and connected as a whole.Specifically, power battery 10 can be cylindrical power battery, current collector plate 3 can be negative current collector plate, the material of annular collar 4, the material of shell 1 and the material of cover 2 are same or similar, for example, the material of shell 1, annular collar 4 and cover 2 are all steel, by setting the material of annular collar 4 as same with the material of shell 1 and cover 2, it is convenient for annular collar 4 and shell 1 and cover 2 to be welded and connected, and it is not easy to appear crack at welding place to cause leakage and other problems, in addition, the material of current collector plate 3 is consistent or similar with the material of full tab of roll core 5, for example, the material of current collector plate 3 and the material of full tab are all aluminum, the thickness of current collector plate 3 and the thickness of annular collar 4 are all greater than or equal to 0.1 millimeter and less than or equal to 0.6 millimeter, the thickness of shell 1 is greater than or equal to 0.2 millimeter and less than or equal to 2.0 millimeter, the thickness of cover 2 is greater than or equal to 0.2 millimeter and less than or equal to 2.0 millimeter.Annular collar 4 and current collector plate 3 are laser welded and connected or riveted and connected or ultrasonic welded and connected, since current collector plate 3 and annular collar 4 are located in the inside of shell 1, current collector plate 3 is only welded and connected or riveted and connected or ultrasonic welded and connected with annular collar 4, and will not be directly welded and connected with shell 1 and cover 2, effectively reduce the crack at welding place to cause leakage and other problems, ingenious design.

[0031] The utility model embodiment through setting bending portion 32 on the edge of current collector plate 3 and setting annular collar 4 on the outer periphery of bending portion 32, through annular collar 4 and shell 1 and cover 2 welded and connected as a whole, effectively avoid the material of current collector plate 3 and the material of shell 1 in prior art different to cause welding place easy to appear crack, appear leakage and other security risk problems.

[0032] In the utility model embodiment, the angle between bending portion 32 and disc body 31 is greater than 90 degrees and less than or equal to 120 degrees, so that bending portion 32 has a certain elasticity, facilitating subsequent assembly can be close to the inner wall of shell 1.

[0033] In the utility model embodiment, as shown in Figures 2 to 4 Annular collar 4 is sleeved on the outer surface of bending portion 32, and annular collar 4 and bending portion 32 are laser welded and connected or riveted and connected or ultrasonic welded and connected, as shown in Figure 4As shown, the outer surface of the annular collar 4 is also inwardly recessed with a first recessed part 43 to facilitate the fixed connection of the annular collar 4 and the bending part 32 at the first recessed part 43.

[0034] It should be noted that, in some other embodiments, as Figures 5 to 6 As shown, the cross section of the annular collar 4 is L-shaped and the annular collar 4 comprises a vertical part 41 and a horizontal part 42 connected with the vertical part 41, the disc-shaped body 31 comprises an edge part 311 and a downwardly recessed intermediate trough part 312, the vertical part 41 is sleeved on the outer surface of the bending part 32 and the horizontal part 42 is attached to the lower surface of the edge part 311, the edge part 311 and the horizontal part 42 are laser-welded, riveted or ultrasonic-welded, and the intermediate trough part 312 is welded with the full lug at one end of the winding core 5. Specifically, the inner surface of the vertical part 41 is attached to the outer surface of the bending part 32, the upper surface of the horizontal part 42 is attached to the lower surface of the edge part 311, and the intermediate trough part 312 is a downwardly recessed structure to facilitate the welding connection of the current collector plate 3 and the full lug at one end of the winding core 5, as shown in Figure 6 As shown, the outer surface of the horizontal part 42 can also be provided with a second recessed part 421 inwardly recessed to facilitate the fixed connection of the horizontal part 42 and the edge part 311 at the second recessed part 421.

[0035] In the embodiments of the utility model, as shown in Figures 8 to 9 As shown, the upper surface of the annular collar 4 is higher than the upper surface of the bending part 32, the upper surface of the shell 1 is higher than the upper surface of the annular collar 4, the edge of the cover 2 is provided with a first step part 21, the first step part 21 is installed on the annular collar 4 and the lower bottom surface of the cover 2 is overlapped with the upper surface of the bending part 32, and the outer side surface of the upper part of the cover 2 is abutted with the inner wall of the shell 1. The shell 1, the cover 2 and the annular collar 4 have a first connecting gap 23 therebetween, the first connecting gap 23 is a vertical gap, and the shell 1, the cover 2 and the annular collar 4 are welded at the first connecting gap 23. The welding connection of the shell 1, the cover 2 and the annular collar 4 can be realized through a one-time laser welding process, which not only connects and guides the current collector plate 3 and the shell 1, but also synchronously completes the sealing process of the shell 1, thereby saving the complicated process cost and greatly improving the continuous manufacturing efficiency and yield, and the design is ingenious.

[0036] In some other embodiments of the utility model, as Figure 10As shown, the upper surface of the annular collar 4 is higher than the upper surface of the bending part 32, the upper surface of the shell 1 is flush with the upper surface of the annular collar 4, the edge of the cover 2 is provided with a second step part 22, the second step part 22 is lapped on the annular collar 4 and the shell 1, the lower bottom surface of the cover 2 is lapped on the upper surface of the bending part 32, the second connecting gap 24 is formed between the second step part 22 and the shell 1 and the annular collar 4, the second connecting gap 24 is a horizontal gap, the cover 2, the shell 1 and the annular collar 4 are welded and connected at the second connecting gap 24, the welding and connection of the shell 1, the cover 2 and the annular collar 4 can be realized by one-time laser welding process at the second connecting gap 24, the current collector plate 3 and the shell 1 are communicated and flow-guided, and the sealing and sealing process of the shell 1 is also completed synchronously, the process cost can be saved, the continuous manufacturing efficiency and yield are greatly improved, and the design is ingenious.

[0037] In some other embodiments of the utility model, Figure 11 As shown, the upper surface of the annular collar 4 is higher than the upper surface of the bending part 32, the upper surface of the shell 1 is higher than the upper surface of the annular collar 4, the edge of the cover 2 is provided with an annular part 25 protruding upwards, the annular part 25 is provided with a third step part 251, the third step part 251 is installed on the annular collar 4 and the lower bottom surface of the cover 2 is lapped on the upper surface of the bending part 32, the outer side surface of the annular part 25 abuts against the inner wall of the shell 1, the third connecting gap 26 is formed between the shell 1 and the annular part 25 and the annular collar 4, the third connecting gap 26 is a vertical gap, the shell 1, the annular part 25 and the annular collar 4 are welded and connected at the third connecting gap 26, the welding and connection of the shell 1, the cover 2 and the annular collar 4 can be realized by one-time laser welding process at the third connecting gap 26, the current collector plate 3 and the shell 1 are communicated and flow-guided, and the sealing and sealing process of the shell 1 is also completed synchronously, the process cost can be saved, the continuous manufacturing efficiency and yield are greatly improved, and the design is ingenious.

[0038] It should be noted that the specific structure of the shell 1, the cover 2 and the annular collar 4 is not limited, as long as the shell 1, the cover 2 and the annular collar 4 can be connected with each other and connected with each other by one-time laser welding process at the connecting gap.

[0039] In the embodiments of the utility model, Figure 9 As shown, the liquid storage bin 6 is formed between the disc-shaped body 31 and the cover 2, and the size space of the liquid storage bin 6 can be flexibly designed according to the performance of the power battery 10, and the corresponding electrolyte amount can be stored.

[0040] The utility model discloses a set of current collector disc 3 and power battery 10 shell 1 communication flow, also complete battery shell 1 sealing sealing process simultaneously, can save process cumbersome cost, improve continuity manufacturing efficiency and yield greatly, simultaneously, can avoid the crack embrittlement, drop and welding damage roll core 5 etc. A series of uncontrollable phenomena that produce between different material metal seal, further avoid leakage, open circuit failure risk, damage roll core 5 etc. Safety risk. Moreover, avoid the bending treatment of current collector disc 3 extension handle place, will not produce any stress, further avoid the battery produces leakage and burst risk, and the ingenious use of the bending space of old structure design, form the storage electrolyte storehouse that can adjust flexibly, can according to the performance of power battery 10, the size space of flexible design liquid storage 6, store corresponding electrolyte amount. Through above design, not only avoid the drawbacks of the prior art structure, but also improve continuity manufacturing efficiency and yield, can also adjust the storage electrolyte amount flexibly, greatly improve the performance, reliability and manufacturing efficiency of power battery 10.

[0041] The above disclosed is only the preferred embodiment of the utility model, of course can not with this to limit the utility model right scope, therefore the equivalent change that the utility model application patent range made still belongs to the range that the utility model covers.

Claims

1. A power cell, characterized by The shell, the cover, the core, the current collector plate and the ring-shaped sleeve are arranged in the shell, the current collector plate comprises a disc-shaped body and a bent part bent upward from the edge of the disc-shaped body, the ring-shaped sleeve is sleeved on the outer surface of the bent part and fixedly connected with the current collector plate, and the material of the ring-shaped sleeve is the same as that of the shell. The disc-shaped body is welded with the full tab at one end of the core, and the cover is welded with the shell and the ring-shaped sleeve to be integrated.

2. The power cell of claim 1, wherein, The angle between the bent part and the disc-shaped body is greater than 90 degrees and less than or equal to 120 degrees.

3. The power cell of claim 1, wherein, The ring-shaped sleeve is laser welded, riveted or ultrasonic welded with the current collector plate.

4. The power cell of claim 3, wherein, The cross section of the ring-shaped sleeve is L-shaped, the disc-shaped body comprises an edge part and a downward recessed middle groove part, the vertical part is sleeved on the outer surface of the bent part, the horizontal part is attached to the lower surface of the edge part, the edge part and the horizontal part are laser welded, riveted or ultrasonic welded, and the middle groove part is welded with the full tab at one end of the core.

5. The power cell of claim 1, wherein, The upper surface of the ring-shaped sleeve is higher than the upper surface of the bent part, the upper surface of the shell is higher than the upper surface of the ring-shaped sleeve, the edge of the cover is provided with a first step part, the first step part is mounted on the ring-shaped sleeve, the lower bottom surface of the cover is overlapped with the upper surface of the bent part, and the outer side surface of the upper part of the cover is abutted with the inner wall of the shell.

6. The power cell of claim 5, wherein, The shell, the cover and the ring-shaped sleeve have a first connecting gap, and the shell, the cover and the ring-shaped sleeve are welded at the first connecting gap.

7. The power cell of claim 1, wherein, The upper surface of the ring-shaped sleeve is higher than the upper surface of the bent part, the upper surface of the shell is flush with the upper surface of the ring-shaped sleeve, the edge of the cover is provided with a second step part, the second step part is overlapped on the ring-shaped sleeve and the shell, and the lower bottom surface of the cover is overlapped with the upper surface of the bent part.

8. The power cell of claim 7, wherein, The second step part has a second connecting gap with the shell and the ring-shaped sleeve, and the cover, the shell and the ring-shaped sleeve are welded at the second connecting gap.

9. The power cell of claim 1, wherein, The disc-shaped body and the cover form a liquid storage bin.

10. The power cell of claim 1, wherein, The material of the shell, the cover and the ring-shaped sleeve is steel.

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