Power battery

Abstract

The utility model discloses a power battery which comprises a shell and a roll core, the roll core is provided with a central hole, a positive pole full tab at one end of the roll core is connected with a positive pole current collecting disc, a negative pole full tab at the other end of the roll core is connected with a negative pole current collecting disc, the positive pole current collecting disc comprises a first disc-shaped body, and the middle of the first disc-shaped body is provided with a sieve hole part corresponding to the central hole; a plurality of through holes are formed in the sieve hole part, the negative current collecting disc comprises a second disc-shaped body, and a middle penetrating hole is formed in the middle of the second disc-shaped body; the shell comprises a bottom shell, a liquid injection hole is formed in the middle of the bottom shell, a sealing glue nail is arranged in the liquid injection hole, and the bottom shell, the sealing glue nail, the negative current collecting plate, the center hole and the positive current collecting plate form a safety channel. According to the utility model, the sieve hole part is arranged at the middle position of the positive collector plate of the power battery, and the bottom shell, the sealing rubber nail, the negative collector plate, the central hole and the positive collector plate form the safety channel, so that the falling sealing rubber nail is kept in the safety channel, and a roll core is not influenced.

Description

TECHNICAL FIELD

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

[0002] At present, lithium ion or sodium ion cylindrical battery gradually becomes new energy industry mainstream product because of high energy density, capacity consistency is good, can support big times of charging and discharging and so on advantage, more and more manufacturers are in pursuit of cylindrical battery high safety, also think of method to improve production yield, common problem:

[0003] 1, cylindrical power battery production process, glue nail or insert glue nail appears unable to avoid broken nail problem, broken part nail can escape to the core and shell cover gap, with positive and negative pole charging and discharging and thickness rebound, glue nail extrusion pole piece leads to battery fire / explosion, therefore can only be broken nail battery directly scrap, lead to cylindrical power battery production yield is affected;

[0004] 2, cylindrical power battery loading vibration, glue nail of liquid injection hole assembly falls into the battery interior, escape to the core and shell cover gap, battery long-term charging and discharging positive and negative pole thickness rebound inflation extrusion internal space, glue nail may be passive extrusion isolation membrane and positive and negative pole piece, lead to short circuit fire. SUMMARY

[0005] The utility model discloses a power battery to solve the problem of battery scrap caused by broken nail during assembly of the existing power battery and the problem of short circuit fire caused by the falling of sealing glue nail into the battery interior during the loading vibration of the power battery.

[0006] In order to realize the above-mentioned purpose, the utility model provides a power battery, which comprises a shell and a core provided in the shell, the core has a center hole, a positive electrode full tab at one end of the core is connected with a positive electrode current collector disc, a negative electrode full tab at the other end of the core is connected with a negative electrode current collector disc, the positive electrode current collector disc comprises a first disc-shaped body, a sieve hole part is arranged at the middle part of the first disc-shaped body corresponding to the center hole, a plurality of through holes are arranged on the sieve hole part, the negative electrode current collector disc comprises a second disc-shaped body, a middle part perforation is arranged at the middle part of the second disc-shaped body, the shell comprises a bottom shell, the bottom shell is welded and connected with the circumferential side of the middle part perforation, a liquid injection hole is arranged in the middle part of the bottom shell, a sealing glue nail is arranged in the liquid injection hole, the bottom shell, the sealing glue nail, the negative electrode current collector disc, the center hole and the positive electrode current collector disc form a safety channel.

[0007] Preferably, the positive electrode current collector disc further comprises an extension handle, the extension handle extends outward from the first disc-shaped body and is partially folded on the first disc-shaped body.

[0008] Preferably, at least one first recessed portion recessed towards the winding core is further arranged on the first disc-shaped body, and the first recessed portion is welded to the positive full tab.

[0009] Preferably, a first liquid permeation hole is further arranged on the first disc-shaped body, and the first liquid permeation hole is arranged on a region of the first disc-shaped body except the first recessed portion and the sieve hole portion.

[0010] Preferably, the through hole is a circular hole, a diameter of the circular hole is greater than or equal to 0.5 mm and less than or equal to 1.5 mm, and the diameter of the circular hole is less than half of a size of the sealing rubber nail in a thickness direction.

[0011] Preferably, the through hole is a rectangular hole, a width of the rectangular hole is greater than or equal to 0.7 mm and less than or equal to 1.5 mm, and the width of the rectangular hole is less than half of a size of the sealing rubber nail in a thickness direction.

[0012] Preferably, at least one second recessed portion recessed towards the winding core is further arranged on the second disc-shaped body, and the second recessed portion is welded to the negative full tab of the winding core.

[0013] Preferably, the liquid injection hole comprises a recessed groove and a connecting hole arranged at a bottom of the recessed groove, the connecting hole is arranged with the sealing rubber nail, and the recessed groove is sealed and connected to the metal sealing nail.

[0014] Preferably, the bottom shell is laser penetration welded to a circumferential side of the middle perforation.

[0015] Compared with the prior art, the utility model discloses a sieve hole portion arranged at a middle position of a positive current collecting disc of a power battery, and a safety channel is formed by a bottom shell, a sealing rubber nail, a negative current collecting disc, a center hole and the positive current collecting disc, so that the power battery production yield is effectively improved, and the short circuit and fire risk caused by the sealing rubber nail falling off after the power battery is installed in a vehicle and vibrates is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural diagram of the power battery of the utility model embodiment.

[0017] Figure 2 It is a structural diagram of one angle of the positive current collecting disc in the utility model embodiment.

[0018] Figure 3 It is a structural diagram of another angle of the positive current collecting disc in the utility model embodiment.

[0019] Figure 4 It is a structural diagram of still another angle of the positive current collecting disc in the utility model embodiment.

[0020] Figure 5 The structure diagram of the sealing glue nail in the embodiment of the utility model.

[0021] Figure 6 The structure diagram of the negative current collecting disc in the embodiment of the utility model.

[0022] Figure 7 The sectional structure diagram of the power battery in the embodiment of the utility model.

[0023] Figure 8 For Figure 7 The enlarged view of A in the middle.

[0024] Figure 9 For Figure 7 The enlarged view of B in the middle.

[0025] Figure 10 The structure diagram of the positive current collecting disc in the embodiment of the utility model, wherein the through hole is a rectangular hole. CONCRETE IMPLEMENTATION

[0026] In order to make the technical content, structural features and effects of the utility model clear, the following will be described in detail in combination with the embodiments and the drawings.

[0027] As Figures 1 to 10As shown in the utility model embodiment, the power battery 10 comprises a shell 1 and a roll core 2 arranged in the shell 1, the roll core 2 has a central hole 21, a positive electrode full tab at one end of the roll core 2 is connected with a positive electrode current collector plate 3, a negative electrode full tab at the other end of the roll core 2 is connected with a negative electrode current collector plate 4, the positive electrode current collector plate comprises a first disc-shaped body 31, a sieve hole part 313 is arranged at the middle part of the first disc-shaped body 31 and corresponds to the central hole 21, a plurality of through holes 3131 are arranged on the sieve hole part 313, the negative electrode current collector plate 4 comprises a second disc-shaped body 41, and a middle part perforation 43 is arranged at the middle part of the second disc-shaped body 41; the shell 1 comprises a bottom shell 11, the bottom shell 11 is welded and connected with the circumferential side of the middle part perforation 43, a liquid injection hole is formed in the middle part of the bottom shell 11, a sealing rubber nail 5 is arranged in the liquid injection hole, and the bottom shell 11, the sealing rubber nail 5, the negative electrode current collector plate 4, the central hole 21 and the positive electrode current collector plate 3 form a safety channel 7. Specifically, the power battery 10 can be a cylindrical power battery, and the power battery 10 further comprises a top cover, the top cover seals an open end 12 of the shell 1, the sealing rubber nail 5 passes through the liquid injection hole, the middle part perforation 43 and extends into the central hole 21 of the roll core 2, the sieve hole part 313 is arranged so that the power battery 10 can facilitate liquid seepage when liquid injection and can prevent the sealing rubber nail 5 or part of the broken nail of the sealing rubber nail 5 from passing through the sieve hole part 313, the circumferential side of the middle part perforation 43 of the negative electrode current collector plate 4 is welded and connected with the bottom shell 11, so that the sealing rubber nail 5 or part of the broken nail of the sealing rubber nail 5 can be prevented from entering between the bottom shell 11 and the negative electrode current collector plate 4 and passing through the second liquid seepage hole 44 on the negative electrode current collector plate 4 to enter the area of the roll core 2, when the sealing rubber nail 5 is broken when the liquid injection hole is sealed, the power battery 10 in the utility model embodiment can directly replace the sealing rubber nail 5 and reseal, part of the broken sealing rubber nail 5 falls into the safety channel 7 and is permanently sealed, in addition, when the sealing rubber nail 5 falls off from the liquid injection hole during long-term vibration of the power battery 10 during loading, the sealing rubber nail 5 will not escape into the top cover and the roll core 2 or the bottom shell 11 and the roll core 2, but will be retained in the safety channel 7, and the design is very ingenious.

[0028] In the utility model embodiment, the sieve hole part 313 is arranged at the middle part of the positive electrode current collector plate 3 of the power battery 10, and the bottom shell 11, the sealing rubber nail 5, the negative electrode current collector plate 4, the central hole 21 and the positive electrode current collector plate 3 form the safety channel 7, so that the fallen sealing rubber nail 5 or part of the broken nail of the sealing rubber nail 5 is retained in the safety channel 7 and does not affect the roll core 2, the production yield of the power battery 10 is effectively improved, and the short circuit and fire risk caused by the falling of the sealing rubber nail 5 after the vibration of the power battery 10 during loading is avoided.

[0029] In the utility model embodiment, as shown in the utility model embodiment, Figures 2 to 4 The positive electrode current collector plate 3 further comprises an extension handle 32, the extension handle 32 extends outward from the first disc-shaped body 31 and is partially folded on the first disc-shaped body 31. Specifically, a pole is arranged on the top cover, and the extension handle 32 is used for being welded and connected with the pole to electrically connect the positive electrode full tab of the power battery 10 with the pole.

[0030] Further, as shown in Figures 2 to 4 , the first disc-shaped body 31 is further provided with at least one first recessed portion 311 recessed towards the winding core 2, and the first recessed portion 311 is welded with the positive full tab. Specifically, the first recessed portion 311 is distributed on the side of the sieve hole portion 313, and the first recessed portion 311 is fan-shaped, and the positive current collector plate 3 is welded with the positive full tab through the first recessed portion 311.

[0031] Further, as shown in Figures 2 to 4 , the first disc-shaped body 31 is further provided with a first liquid permeable hole 312, and the first liquid permeable hole 312 is arranged on the area of the first disc-shaped body 31 except the first recessed portion 311 and the sieve hole portion 313.

[0032] In the embodiment of the utility model, as shown in Figure 4 and Figure 5 , the through hole 3131 is a circular hole, and the diameter D of the through hole 3131 is greater than or equal to 0.5 mm and less than or equal to 1.5 mm, and the diameter D of the circular hole is less than half of the size H in the thickness direction of the sealing rubber nail 5.

[0033] In some other specific embodiments of the utility model, as shown in Figure 5 and Figure 10 , the through hole 3131 is a rectangular hole, and the width W of the rectangular hole is greater than or equal to 0.7 mm and less than or equal to 1.5 mm, and the width W of the rectangular hole is less than half of the size H in the thickness direction of the sealing rubber nail 5.

[0034] In the embodiment of the utility model, as shown in Figure 6 , the second disc-shaped body 41 is further provided with at least one second recessed portion 42 recessed towards the winding core 2, and the second recessed portion 42 is welded with the negative full tab of the winding core 2, and the second liquid permeable hole 44 is arranged avoiding the second recessed portion 42.

[0035] In the embodiment of the utility model, as shown in Figure 7 and Figure 9 , the liquid injection hole comprises a recessed groove 112 and a connecting hole 111 arranged at the bottom of the recessed groove 112, the connecting hole 111 is provided with a sealing rubber nail 5, the recessed groove 112 is sealingly connected with the metal sealing nail 6, and the liquid injection hole is double sealed by the sealing rubber nail 5 and the metal sealing nail 6.

[0036] In the embodiment of the utility model, as shown in Figure 9 , the bottom shell 11 and the circumferential side of the middle perforation 43 are laser penetration welded. Specifically, the laser penetration welding is used to connect the bottom shell 11 and the circumferential side of the middle perforation 43, and the welding is convenient.

[0037] The assembling method of the power battery 10 is as follows: firstly, the positive full tab of the winding core 2 is fixed by laser welding with the positive current collector disc 3, and the negative full tab of the winding core 2 is connected with the negative current collector disc 4 by laser welding; then the winding core 2 connected with the positive current collector disc 3 and the negative current collector disc 4 is placed in the shell 1 and assembled with the negative current collector disc 4 facing the bottom shell 11, and then the negative current collector disc 4 is fixed by penetrating welding with the bottom shell 11 by using the clamp to press against the positive current collector disc 3; then the extension handle 32 of the positive current collector disc 3 is welded with the top cover pole, and the opening end 12 of the shell 1 is sealed by welding with the top cover; after liquid injection or formation liquid supplement, the sealing glue nail 5 is inserted, if the nail is broken, the new sealing glue nail 5 can be directly used to reseal the liquid injection hole, and the broken nail falls into the safety channel 7 and is permanently sealed; 5, finally, the metal sealing nail 6 is fixed by laser welding.

[0038] The above is only a preferred embodiment of the utility model, and of course cannot limit the scope of the utility model, so equivalent changes made in the scope of the utility model patent application still belong to the scope covered by the utility model.

Claims

1. A power cell, characterized by The application relates to a battery, which comprises a shell and a winding core arranged in the shell, wherein the winding core has a center hole, a positive electrode full tab at one end of the winding core is connected with a positive electrode current collector plate, a negative electrode full tab at the other end of the winding core is connected with a negative electrode current collector plate, the positive electrode current collector plate comprises a first disc-shaped body, a sieve hole part is arranged at the middle part of the first disc-shaped body corresponding to the center hole, a plurality of through holes are arranged on the sieve hole part, the negative electrode current collector plate comprises a second disc-shaped body, and a middle part through hole is arranged at the middle part of the second disc-shaped body. The shell comprises a bottom shell, the bottom shell is welded with the circumferential side of the middle part through hole, a liquid injection hole is arranged at the middle part of the bottom shell, a sealing rubber pin is arranged in the liquid injection hole, and the bottom shell, the sealing rubber pin, the negative electrode current collector plate, the center hole and the positive electrode current collector plate form a safety channel.

2. The power cell of claim 1, wherein, The positive electrode current collector plate further comprises an extension handle, the extension handle extends outward from the first disc-shaped body and is partially folded on the first disc-shaped body.

3. The power cell of claim 2, wherein, At least one first recessed part is arranged on the first disc-shaped body and recessed towards the winding core, and the first recessed part is welded with the positive electrode full tab.

4. The power cell of claim 3, wherein, A first liquid permeation hole is arranged on the first disc-shaped body, and the first liquid permeation hole is arranged on the first disc-shaped body except the first recessed part and the sieve hole part.

5. The power cell of claim 1, wherein, The through hole is a circular hole, the diameter of the through hole is greater than or equal to 0.5 mm and less than or equal to 1.5 mm, and the diameter of the circular hole is less than half of the size of the thickness direction of the sealing rubber pin.

6. The power cell of claim 1, wherein, The through hole is a rectangular hole, the width of the rectangular hole is greater than or equal to 0.7 mm and less than or equal to 1.5 mm, and the width of the rectangular hole is less than half of the size of the thickness direction of the sealing rubber pin.

7. The power cell of claim 1, wherein, At least one second recessed part is arranged on the second disc-shaped body and recessed towards the winding core, and the second recessed part is welded with the negative electrode full tab of the winding core.

8. The power cell of claim 1, wherein, The liquid injection hole comprises a recessed groove and a connecting hole arranged at the bottom of the recessed groove, the connecting hole is arranged with the sealing rubber pin, and the recessed groove is sealed with the metal sealing pin.

9. The power cell of claim 1, wherein, The bottom shell is laser penetration welded with the circumferential side of the middle part through hole.

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