CN218334186U

CN218334186U - Power battery

Info

Publication number: CN218334186U
Application number: CN202222667963.XU
Authority: CN
Inventors: 何世亚; 吴孙光; 戴麒迪; 梁元; 高正军; 张鹏搏; 张华党; 于可心
Original assignee: Ningbo Zhenyu Technology Co Ltd
Current assignee: Ningbo Zhenyu Technology Co Ltd
Priority date: 2022-10-09
Filing date: 2022-10-09
Publication date: 2023-01-17
Anticipated expiration: 2032-10-09

Abstract

The utility model discloses a power battery, which comprises a bottom shell, a top cover plate assembly and an electric core, wherein the top cover plate assembly is arranged at the top of the bottom shell, the electric core is arranged in the bottom shell, the bottom shell comprises a bottom plate and an annular shell, the bottom plate and the annular shell are integrally formed to form an accommodating cavity with an opening at the top, the electric core is arranged in the accommodating cavity, and the top cover plate assembly is arranged on the opening; the bottom plate is provided with a first reinforcing part to form a first protruding part on the outer surface of the bottom plate and a first groove on the corresponding inner surface of the bottom plate, and the bottom plate is provided with a blasting nick beside the first reinforcing part. With bottom plate and cyclic annular casing integrated into one piece to an organic whole sets up blast resistant construction on the bottom plate, reduces the processing technology of traditional bottom plate and cyclic annular casing when connecting and to blast resistant construction's influence, promotes the stability of blasting, sets up first rib on the surface in the blasting nick place simultaneously, can increase local intensity, makes the blasting nick more stable, can play fine guard action when receiving the impact.

Description

Power battery

Technical Field

The utility model relates to a new forms of energy power battery technical field, concretely relates to power battery.

Background

The power battery is an important component of the new energy vehicle, and the lithium ion battery has the advantages of high specific energy, no pollution, no memory effect and the like, so the lithium ion battery is mostly adopted as the power battery of the existing new energy vehicle. In order to prevent the internal pressure of the lithium battery from increasing due to thermal runaway possibly occurring in the process of long-term cyclic use of the lithium battery, an explosion-proof valve needs to be installed on the battery so as to reduce the safety risk of the battery.

The explosion-proof valve is generally installed on a top cover plate or a bottom shell of the battery through laser welding in the conventional lithium battery, the cost is high, and the opening pressure of the explosion-proof valve is greatly influenced by heat generated during laser welding. For example, in the "dual explosion-proof valve high-safety square lithium battery" disclosed in chinese patent CN202122213093.4, the lower explosion-proof valve is disposed on the bottom plate of the square casing, and the explosion-proof valve patch of the lower explosion-proof valve is welded to the lower end surface of the bottom plate of the square casing, which also has the same problems.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one technical defect, the utility model provides a following technical scheme:

the power battery comprises a bottom shell, a top cover plate assembly and a battery cell, wherein the top cover plate assembly is installed at the top of the bottom shell, the battery cell is installed in the bottom shell, the bottom shell comprises a bottom plate and an annular shell, the bottom plate and the annular shell are integrally formed to form an accommodating cavity with an opening at the top, the battery cell is installed in the accommodating cavity, and the top cover plate assembly is installed on the opening;

the bottom plate is provided with a first reinforcing part to form a first protruding part on the outer surface of the bottom plate and a first groove on the corresponding inner surface of the bottom plate, and the bottom plate is provided with blasting nicks located beside the first reinforcing part.

Preferably, the blasting score has a circular arc shape.

When the internal pressure of the battery reaches a set value, the explosion nicks crack to release the pressure, and the head and the tail of the explosion nicks are not connected, so that the central area of the bottom plate cannot be separated from the bottom plate.

According to the power battery, the bottom plate is further provided with a second reinforcing part, so that a second protruding part is formed on the outer surface of the bottom plate, and a second groove is formed on the corresponding inner surface of the bottom plate.

According to the power battery, the second reinforcing part is located outside the first reinforcing part.

Preferably, the second protruding portion is located outside the first protruding portion, and the second groove is located outside the first groove.

According to the power battery, the blasting notch is located between the first reinforcing portion and the second reinforcing portion.

According to the power battery, the bottom plate is provided with the concave part, and the blasting nick is arranged in the concave part.

According to the power battery, the blasting nick is located on the outer surface of the bottom plate.

According to the power battery, the blasting nick is located on the inner surface of the bottom plate.

According to foretell power battery, electric core includes positive plate, negative pole piece, diaphragm, and positive plate and negative pole piece range upon range of the coiling are the book core, roll up the outer parcel of core and have the diaphragm in order to form electric core.

Preferably, the positive plate is wrapped by a diaphragm.

According to foretell power battery, the anodal current collecting disc of matching with top cap piece subassembly is installed to the tip of positive plate, top cap piece subassembly cooperatees with the diaphragm and supports and lean on, negative current collecting disc is installed to the tip of negative pole piece, be equipped with the support that leans on with the diaphragm counterbalance between negative current collecting disc and the bottom plate.

According to the power battery, the bottom shell is made of steel.

According to the power battery, the height of the bottom shell is 20-600mm.

Preferably, the blast score is C-shaped on the surface of the base plate.

Preferably, the first reinforcement portion is disposed around a center of the bottom plate.

Compared with the prior art, the beneficial effects of the utility model are that:

with bottom plate and cyclic annular casing integrated into one piece to an organic whole sets up blast resistant construction on the bottom plate, reduces the processing technology of traditional bottom plate and cyclic annular casing when connecting and to blast resistant construction's influence, promotes the stability of blasting, sets up first rib on the surface in the blasting nick place simultaneously, can increase local intensity, makes the blasting nick more stable, can play fine guard action when receiving the impact.

Drawings

FIG. 1 is a schematic structural diagram of a power cell;

fig. 2 is a bottom view of the power cell;

FIG. 3 isbase:Sub>A sectional view A-A of FIG. 2;

FIG. 4 is an exploded view of a power cell;

FIG. 5 is a schematic structural diagram of another embodiment of the bottom case;

fig. 6 is a cross-sectional view taken along line D-D of fig. 5.

The bottom shell 1, the bottom plate 11, the first reinforcing part 111, the first protruding part 112, the first groove 113, the blasting notch 114, the second reinforcing part 115, the second protruding part 116, the second groove 117, the recess 118, the annular shell 12, and the accommodating cavity 1a;

a top flap assembly 2;

the battery cell 3, the positive plate 31, the negative plate 32 and the diaphragm 33;

positive current collecting plate 4, negative current collecting plate 5, and support 6.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.

As shown in fig. 3-4, a power battery includes a bottom case 1, a top cover plate assembly 2 and a battery cell 3, the top cover plate assembly 2 is installed on the top of the bottom case 1, the battery cell 3 is installed in the bottom case 1, the bottom case 1 includes a bottom plate 11 and an annular casing 12, the bottom plate 11 and the annular casing 12 are integrally formed to form an accommodating cavity 1a with an opening on the top, the battery cell 3 is installed in the accommodating cavity 1a, and the top cover plate assembly 2 is installed on the opening. Wherein, drain pan 1 is the steel drain pan, and bottom plate 11 is circular, and drain pan 1 is cylindrical, and top flap subassembly 2 welds with the annular shell 12 of drain pan 1. The height of the bottom case 1 is 20-600mm.

As shown in fig. 1 and 4, the bottom plate 11 is provided with a first reinforcing portion 111 to form a first protrusion 112 on an outer surface of the bottom plate 11 and a first groove 113 on a corresponding inner surface of the bottom plate 11, so as to improve the structural strength of the bottom plate 11 without changing the thickness of the bottom plate 11. Preferably, the first reinforcement part 111 is disposed around the center of the base plate 11 to form a ring-shaped first protrusion part 112 and a ring-shaped first recess 113.

As shown in fig. 1-2, the bottom plate 11 is further provided with a second reinforcing portion 115 to form a second protrusion 116 on an outer surface of the bottom plate 11 and a second groove 117 on a corresponding inner surface of the bottom plate 11, so as to further improve the structural strength of the bottom plate 11. Preferably, the second reinforcing part 115 is located outside the first reinforcing part 111, and the second reinforcing part 115 is disposed around the center of the bottom plate 11 such that the second protrusion 116 is located outside the first protrusion 112 and the second groove 117 is located outside the first groove 113.

As shown in fig. 1-2, the bottom plate 11 is provided with a burst notch 114 located beside the first reinforcing part 111. Preferably, the explosion score 114 has a C shape, more particularly, a circular arc shape on the surface of the base plate 11, and the longitudinal section of the explosion score 114 has a U shape or a V shape.

The structural strength of the surface of the bottom plate 11 is improved by the convex portion on the bottom plate 11, so that the dimensional stability of the blasting notch 114 is good and the uniformity of the blasting pressure is high.

Preferably, the burst notch 114 is located between the first reinforcement 111 and the second reinforcement 115. Two protrusions are formed on the outer surface of the base plate 11 to facilitate the feeding of the material when the blast score 114 is processed.

Because the blasting notch 114 is burst cracked when being subjected to a certain pressure, and has stress after being processed, and is relatively fragile, the bottom plate 11 is provided with the concave part 118, and the blasting notch 114 is arranged in the concave part 118, so that the blasting notch is positioned in the concave part 118 and is not easily contacted directly, and the blasting notch 114 has a certain protection effect. Wherein, the depth of the blasting nick is set according to the size of the explosion-proof value of the product.

As shown in fig. 1-4, in some embodiments, the blast score 114 is located on the outer surface of the bottom panel 11.

In a further embodiment, shown in fig. 5-6, the blast score 114 is located on the inner surface of the bottom panel 11.

As shown in fig. 3, the battery cell 3 includes a positive electrode sheet 31, a negative electrode sheet 32, and a separator 33, the positive electrode sheet 31 and the negative electrode sheet 32 are stacked and wound to form a winding core, and the separator 33 is wrapped around the winding core to form the battery cell 3. Preferably, the separator 33 is wrapped around the outer surface of the positive electrode sheet 31 and attached to the inner wall of the annular housing 12. The positive electrode sheet 31 is a positive aluminum foil, and the negative electrode sheet 32 is a negative copper foil.

As shown in fig. 3, the end of the positive plate 31 is mounted with a positive current collecting plate 4 matched with the top cover plate assembly 2, and the top cover plate assembly 2 is matched with and abutted against the diaphragm 33. Wherein, the positive current collecting plate 4 is welded with the positive plate 31, and a gap is reserved between the positive current collecting plate and the top cover plate assembly 2.

As shown in fig. 3, negative electrode current collecting disk 5 is attached to the end of negative electrode sheet 32, and holder 6 abutting separator 33 is provided between negative electrode current collecting disk 5 and bottom plate 11. In which the negative electrode current collecting disk 5 is welded to the negative electrode tab 32.

Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that modifications and embellishments within the scope of the present disclosure may be made by those skilled in the art without departing from the principles of the present disclosure.

Claims

1. The utility model provides a power battery, includes drain pan (1), top cover plate subassembly (2) and electric core (3), the top at drain pan (1) is installed in top cover plate subassembly (2), install in drain pan (1) electric core (3), its characterized in that: the bottom shell (1) comprises a bottom plate (11) and an annular shell (12), the bottom plate (11) and the annular shell (12) are integrally formed to form an accommodating cavity (1 a) with an opening at the top, the battery cell (3) is installed in the accommodating cavity (1 a), and the top cover plate assembly (2) is installed on the opening;

the base plate (11) is provided with a first reinforcing part (111) to form a first protruding part (112) on the outer surface of the base plate (11), and a first groove (113) on the corresponding inner surface of the base plate (11), and the base plate (11) is provided with a blasting nick (114) located beside the first reinforcing part (111).

2. A power cell according to claim 1, wherein: the bottom plate (11) is also provided with a second reinforcing part (115) so as to form a second bulge (116) on the outer surface of the bottom plate (11) and form a second groove (117) on the corresponding inner surface of the bottom plate (11).

3. A power cell according to claim 2, wherein: the second reinforcing portion (115) is located outside the first reinforcing portion (111).

4. A power cell according to claim 2, wherein: the burst score (114) is located between the first reinforcement (111) and the second reinforcement (115).

5. A power cell according to claim 1, wherein: the bottom plate (11) is provided with a concave part (118), and the blasting nick (114) is arranged in the concave part (118).

6. A power cell according to claim 1, 4 or 5, wherein: the blast score (114) is located on the outer surface of the bottom plate (11);

alternatively, the blast score (114) is located on the inner surface of the bottom panel (11).

7. A power cell according to claim 1, wherein: electric core (3) include positive plate (31), negative pole piece (32), diaphragm (33), and positive plate (31) and negative pole piece (32) range upon range of the coiling are the book core, it has diaphragm (33) in order to form electric core (3) to roll up the outer parcel of core.

8. A power cell according to claim 7, wherein: anodal current collector dish (4) with top cover piece subassembly (2) matched with is installed to the tip of positive plate (31), top cover piece subassembly (2) cooperatees with diaphragm (33) and supports and lean on, negative pole current collector dish (5) is installed to the tip of negative pole piece (32), be equipped with between negative pole current collector dish (5) and bottom plate (11) support (6) that lean on with diaphragm (33) counterbalance.

9. A power cell according to claim 1, wherein: the bottom shell (1) is a steel bottom shell.

10. A power cell according to claim 1, wherein: the height of the bottom shell (1) is 20-600mm; the blasting nick (114) is in a C shape on the surface of the bottom plate (11); the first reinforcement part (111) is disposed around the center of the bottom plate (11).