CN219419389U

CN219419389U - Pole group component and lithium battery

Info

Publication number: CN219419389U
Application number: CN202320262008.XU
Authority: CN
Inventors: 李龙
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2023-02-20
Filing date: 2023-02-20
Publication date: 2023-07-25
Anticipated expiration: 2033-02-20

Abstract

The utility model provides a pole group assembly and a lithium battery, wherein the pole group assembly comprises a shell, a pole group, an insulating film and a separation plate, wherein an opening is formed in the shell, and a mounting hole is formed in at least one side surface of the shell opposite to the opening, and is suitable for mounting an explosion-proof valve; the pole group is arranged in the shell; the insulating film wraps the pole group, and an avoidance port is arranged at the position of the insulating film corresponding to the mounting hole; the division board is located between polar group and the casing to the polar group and the casing of the department of dodging are equipped with the gas pocket on the division board. After the electrode group component with the structure is assembled into a lithium battery, when the battery runs abnormally and generates gas, the gas in the insulating film can be transmitted to the avoidance port nearby and then transmitted to the explosion-proof valve through the air hole and the avoidance port, so that a gas discharge path is effectively reduced, and the safety performance of the battery is improved; the electrode group at the avoiding opening is separated from the shell through a separation plate, so that the electrode group is prevented from directly contacting the shell after liquid injection to corrode the shell.

Description

Pole group component and lithium battery

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a pole group assembly and a lithium battery.

Background

The lithium battery monomer comprises a pole group and a shell, wherein a mounting hole is formed in the side face of the shell for ensuring the safety performance of the battery monomer and improving the capacity of the battery core, and an explosion-proof valve (namely, the explosion-proof valve and a battery cover plate are arranged on different surfaces) is arranged in the mounting hole so that when the battery operates abnormally, gas can be discharged through the explosion-proof valve. The insulation film is wrapped outside the pole group to ensure the insulativity between the pole group and the shell, and simultaneously prevent the pole group from directly contacting the shell after liquid injection to corrode the shell.

According to the lithium battery, when the battery is out of control and hot gas is delayed, gas cannot be timely transmitted to the explosion-proof valve through the shortest path due to the blocking of the insulating film, gas in the battery cannot be timely discharged, and potential safety hazards of battery explosion exist.

Disclosure of Invention

Therefore, the utility model aims to overcome the defects that the gas generated by the out-of-control battery cannot be timely transmitted to the explosion-proof valve and timely discharged due to the fact that the insulating film wrapping electrode group of the lithium battery in the prior art.

To this end, the utility model provides a pole group assembly comprising

The shell is provided with an opening, at least one side surface of the shell opposite to the opening is provided with a mounting hole, and an explosion-proof valve is suitable for being mounted in the mounting hole;

the pole group is arranged in the shell;

the insulation film wraps the pole group, and an avoidance opening is formed in the position, corresponding to the mounting hole, of the insulation film;

the isolating plate is arranged between the pole group and the shell to separate the pole group at the avoidance port from the shell, and air holes are formed in the isolating plate.

Optionally, in the pole group assembly, the mounting hole is formed on a bottom wall of the housing.

Optionally, in the pole group assembly, the separator is disposed between the pole group and the insulating film.

Optionally, in the pole group assembly, the avoidance port is rectangular, the length of the avoidance port is greater than the length of the explosion-proof valve, and the width of the avoidance port is greater than or equal to the width of the pole group.

Optionally, in the pole group assembly, when the insulating film is in the unfolded state, the middle and two sides of the insulating film in the width direction are respectively provided with a notch, and the avoidance opening is arranged at the middle notch of the insulating film.

Optionally, in the pole group assembly, when the insulating film is in an unfolded state, folding nicks are respectively arranged in the middle and at two sides of the width direction of the insulating film, and the avoidance opening is arranged at the nicks at two sides of the insulating film.

Optionally, the above-mentioned polar group subassembly, division board length direction's both sides extend to dodge outside the mouth, dodge and be equipped with on the division board outside the mouth the gas pocket, the division board orientation one side of insulating film is equipped with the spacer, the spacer butt insulating film with form the exhaust passage between division board and the insulating film.

Optionally, in the pole group assembly, the raised pieces are in a block shape, and the raised pieces are arranged at intervals along the length direction of the isolation plate.

Optionally, in the pole group assembly, the housing is in a long blade shape, and the openings are formed at two ends of the housing in a length direction.

The utility model provides a lithium battery comprising the pole group assembly.

The technical scheme of the utility model has the following advantages:

1. after the electrode group assembly is assembled into the lithium battery, when the battery runs abnormally and generates gas, the gas in the insulating film can be transmitted to the avoidance port nearby and then transmitted to the explosion-proof valve through the air hole and the avoidance port, so that a gas discharge path is effectively reduced, and the safety performance of the battery is improved; the electrode group at the avoiding opening is separated from the shell through a separation plate, so that the electrode group is prevented from directly contacting the shell after liquid injection to corrode the shell.

2. The mounting hole is arranged on the bottom wall of the shell, namely, when the battery pack is formed, the explosion-proof valve is arranged at the bottom of the battery pack, so that the original bottom space of the battery pack is effectively utilized for exhausting, and the space utilization rate of the battery pack is improved.

3. The avoidance port is rectangular, the length L of the avoidance port is greater than the length of the explosion-proof valve, the width H of the avoidance port is greater than or equal to the width of the pole group, and after assembly, the avoidance port covers the explosion-proof valve area, so that gas smoothly enters the explosion-proof valve through the avoidance port.

4. The two sides of the length direction of the isolation plate extend out of the avoidance opening, air holes are formed in the isolation plate outside the avoidance opening, and a heightening piece is arranged on one side of the isolation plate, facing the insulating film. The gas generated on the electrode groups at the two sides of the avoidance port can enter the exhaust channel through the gas holes at the two sides of the avoidance port, and then the exhaust channel is rapidly discharged to the avoidance port, so that the gas at the two sides of the avoidance port can be discharged in time.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a pole group assembly according to embodiment 1 of the present utility model;

FIG. 2 is a schematic view of the insulating film of FIG. 1;

FIG. 3 is an expanded view of an insulating film in a pole group assembly according to embodiment 1 of the present utility model;

fig. 4 is an expanded view of an insulating film in a pole group assembly according to a modified embodiment of example 1 of the present utility model;

FIG. 5 is an exploded view of the pole group assembly provided in example 1 of the present utility model;

FIG. 6 is an enlarged view of a portion A of FIG. 5;

FIG. 7 is a schematic view of the separator plate of FIG. 1;

fig. 8 is a schematic diagram of a lithium battery provided in embodiment 2 of the present utility model.

Reference numerals illustrate:

1. a housing; 2. an explosion-proof valve; 3. a pole group; 4. an insulating film; 41. an avoidance port; 42. scoring; 5. a partition plate; 51. air holes; 52. a lifting piece; 6. an end plate; 7. a cover plate; 8. an explosion-proof valve patch.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Example 1

The present embodiment provides a pole group assembly, as shown in fig. 1 to 5, which comprises a housing 1, a pole group 3, an insulating film 4 and a partition board 5, wherein an opening is arranged on the housing 1, and a mounting hole is arranged on at least one side surface of the housing 1 opposite to the opening, and is suitable for mounting an explosion-proof valve 2; the pole group 3 is arranged in the shell 1; the insulating film 4 wraps the pole group 3, and an avoidance port 41 is arranged at the position of the insulating film 4 corresponding to the mounting hole; the isolation plate 5 is arranged between the pole group 3 and the shell 1 to separate the pole group 3 at the avoiding opening 41 from the shell 1, and the isolation plate 5 is provided with an air hole 51.

After the electrode group assembly with the structure is assembled into a lithium battery, when the battery runs abnormally and generates gas, the gas in the insulating film 4 can be closely transferred to the avoidance port 41 and then transferred to the explosion-proof valve 2 through the air hole 51 and the avoidance port 41, so that the gas exhaust path is effectively reduced, and the safety performance of the battery is improved; the pole group 3 at the avoiding port 41 is separated from the shell 1 by the isolating plate 5, so that the pole group 3 is prevented from directly contacting the shell 1 after liquid injection to corrode the shell 1.

The mounting hole is arranged on the bottom wall of the shell 1, namely, when the battery pack is formed, the explosion-proof valve 2 is arranged at the bottom of the battery pack, so that the original bottom space of the battery pack is effectively utilized for exhausting, and the space utilization rate of the battery pack is improved. For example, two mounting holes are provided at intervals in the longitudinal direction of the bottom wall of the housing 1, and an explosion-proof valve 2 is provided in each mounting hole. Optionally, the explosion proof valve 2 is welded to the housing 1.

Referring to fig. 1, the pole group assembly further includes an explosion-proof valve patch 8, and the explosion-proof valve patch 8 is attached to an outer side surface of the explosion-proof valve 2.

Referring to fig. 1, 5 and 6, the isolation plate 5 is disposed between the pole group 3 and the insulating film 4, that is, the isolation plate 5 is disposed between the bottom of the pole group 3 and the insulating film 4, when the lithium battery is assembled, the isolation plate 5 is disposed between the pole group 3 and the insulating film 4, and then the insulating film 4 is folded along the edge of the pole group 3, so that the assembly of the pole group 3, the isolation plate 5 and the insulating film 4 is completed, and the assembly of the isolation plate 5 is convenient.

Referring to fig. 1 to 4, the avoidance port 41 is rectangular, the length L of the avoidance port 41 is greater than the length of the explosion-proof valve 2, the width H of the avoidance port 41 is greater than or equal to the width of the pole group 3, and after assembly, the avoidance port 41 covers the area of the explosion-proof valve 2, so that gas smoothly enters the explosion-proof valve 2 through the avoidance port 41. For example, l=the length of the explosion-proof valve 2+10 mm.

Alternatively, referring to fig. 3, when the insulating film 4 is in the expanded state, the intermediate and both sides of the insulating film 4 in the width direction are respectively provided with scores 42, and the escape opening 41 is provided at the intermediate score 42 of the insulating film 4. Two scores 42 are arranged in the middle of the insulating film 4 at intervals, two ends of the width direction of the avoiding opening 41 respectively extend out of the two scores 42 in the middle, when the insulating film is assembled, the isolating plate 5 is placed above the two scores 42 in the middle in an aligned mode, the pole group 3 is placed on the isolating plate 5, and then the insulating film 4 is folded along the scores 42 so that the insulating film 4 wraps the pole group 3.

Preferably, both sides of the length direction of the isolation plate 5 extend to the outside of the avoidance port 41, that is, both ends of the isolation plate 5 extend to both sides of the avoidance port 41, an air hole 51 is formed in the isolation plate 5 outside of the avoidance port 41, a raising member 52 is arranged on one side of the isolation plate 5 facing the insulating film 4, and the raising member 52 abuts against the insulating film 4 to form an exhaust passage between the isolation plate 5 and the insulating film 4. The gas generated on the electrode groups 3 on the two sides of the avoidance port 41 can enter the exhaust channel through the air holes 51 on the two sides of the avoidance port 41, and then the exhaust channel is rapidly discharged to the avoidance port 41, so that the gas on the two sides of the avoidance port 41 can be conveniently discharged in time.

Referring to fig. 5 and 7, the elevating pieces 52 are in the form of a block, and a plurality of elevating pieces 52 are arranged at intervals along the length direction of the partition plate 5 to uniformly support the partition film to form a continuous and stable exhaust passage. Optionally, the elevating member 52 includes rectangular blocks and circular protruding blocks, a plurality of rows and a plurality of columns of air holes 51 are arranged on the isolation plate 5 at equal intervals, two rows of rectangular blocks and two rows of circular protruding blocks are arranged on two sides of the width direction of the isolation plate 5, the rectangular blocks are located on the outer sides of the air holes 51, the circular protruding blocks are located on the inner sides of the rectangular blocks and are arranged avoiding the air holes 51, so that the air holes 51 are prevented from being blocked, and smooth discharge of air through the air holes 51 is ensured. Alternatively, the spacer 5 is provided throughout the length direction of the pole group 3 to uniformly support the insulating film 4.

For example, the housing 1 is in a long blade shape, openings are formed at two ends of the housing 1 in the length direction, the shape of the pole group 3 is matched with the housing 1, and the pole group 3 and the housing 1 are assembled to form a blade battery. The explosion-proof valve 2 is arranged at the bottom of the shell 1, when the upper part of the pole group 3 generates hot gas, the hot gas can be directly transmitted to the avoiding port 41 from top to bottom and then is discharged through the air hole 51 and the explosion-proof valve 2, so that the exhaust path is effectively reduced.

As a first alternative embodiment of example 1, the housing 1 may also be square, and assembled with the pole set 3 and the cover plate 7 to form a square cell, where the top of the housing 1 is open, and the explosion-proof valve 2 is disposed at the bottom of the housing 1; the mounting holes may also be provided in other side walls of the housing 1 than the bottom wall and the side walls.

As a second alternative embodiment of example 1, the elevating members 52 may also be in the form of elongated blocks, and one elevating member 52 is provided on each of both sides in the width direction of the partition plate 5 to form an exhaust passage between the two elevating members 52.

As a third alternative embodiment of example 1, the air holes 51 may not be provided on the partition plates 5 on both sides of the escape port 41; as a further modification, the isolation plate 5 may be provided only at the avoidance port 41, and both ends thereof may not extend out of the avoidance port 41, so that the gas may be discharged to the avoidance port 41 through the gas hole 51, and the pole group 3 at the avoidance port 41 may be isolated from the housing 1.

As a fourth alternative embodiment of example 1, referring to fig. 3, when the insulating film 4 is in the unfolded state, folding scores 42 are respectively provided at the middle and two sides of the insulating film 4 in the width direction, the escape opening 41 is provided at the scores 42 on the two sides of the insulating film 4, the inner side of the escape opening 41 is located within the scores 42 on the two sides, and the outer side of the escape opening 41 is flush with the edge of the insulating film 4. In assembly, the pole group 3 is placed in the middle of the insulating film 4, the isolating plate 5 is placed on the pole group 3, and finally the insulating film 4 is folded along the notch 42 to wrap the pole group 3. The electrode groups 3 on two sides of the insulating film 4 are respectively provided with an avoiding opening 41, and after the electrode groups are folded, the avoiding openings 41 on two sides are overlapped.

As a fifth alternative embodiment of example 1, a separator 5 may also be provided between the insulating film 4 and the housing 1, i.e. the separator 5 is provided outside the insulating film 4, and the air holes 51 thereon may allow the gas to be discharged to the explosion-proof valve 2 and space the pole group 3 from the housing 1.

Example 2

This embodiment provides a lithium battery including the pole group assembly of embodiment 1, the end plate 6, and the cap plate 7, as shown in fig. 8. The end plates 6 are arranged at openings on two sides of the shell 1 and are abutted against the end parts of the pole groups 3 so as to limit the pole groups 3, and the cover plates 7 are arranged on the end plates 6.

When the operation of the lithium battery with the structure is abnormal and gas is generated, the gas in the insulating film 4 can be closely transferred to the avoidance port 41 and then transferred to the explosion-proof valve 2 through the air hole 51 and the avoidance port 41, so that the gas exhaust path is effectively reduced, and the safety performance of the battery is improved; the spacer 5 prevents the post-injection pole set 3 from directly contacting the housing 1 to corrode the housing 1.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims

1. A pole group assembly, comprising:

the anti-explosion device comprises a shell (1), wherein an opening is formed in the shell, a mounting hole is formed in at least one side surface of the shell (1) opposite to the opening, and an anti-explosion valve (2) is arranged in the mounting hole;

a pole group (3) arranged in the shell (1);

an insulating film (4) wrapping the pole group (3), wherein an avoidance opening (41) is formed in the position, corresponding to the mounting hole, of the insulating film (4);

the isolation plate (5) is arranged between the pole group (3) and the shell (1) so as to separate the pole group (3) at the avoidance port (41) from the shell (1), and an air hole (51) is formed in the isolation plate (5).

2. Pole group assembly according to claim 1, characterized in that the mounting hole is provided on the bottom wall of the housing (1).

3. Pole group assembly according to claim 1 or 2, characterized in that the separator plate (5) is arranged between the pole group (3) and the insulating film (4).

4. The pole group assembly according to claim 2, wherein the relief port (41) is rectangular, the length of the relief port (41) is greater than the length of the explosion-proof valve (2), and the width of the relief port (41) is greater than or equal to the width of the pole group (3).

5. The pole group assembly according to claim 2, wherein when the insulating film (4) is in an unfolded state, the middle and two sides of the insulating film (4) in the width direction are respectively provided with scores (42), and the avoidance port (41) is arranged at the middle score (42) of the insulating film (4).

6. The pole group assembly according to claim 2, wherein when the insulating film (4) is in an unfolded state, folding scores (42) are respectively arranged at the middle and two sides of the insulating film (4) in the width direction, and the avoidance opening (41) is arranged at the scores (42) at the two sides of the insulating film (4).

7. A pole group assembly according to claim 3, wherein the two sides of the length direction of the isolation plate (5) extend to the outside of the avoidance opening (41), the air holes (51) are formed in the isolation plate (5) outside of the avoidance opening (41), a heightening piece (52) is arranged on one side of the isolation plate (5) towards the insulating film (4), and the heightening piece (52) abuts against the insulating film (4) to form an exhaust passage between the isolation plate (5) and the insulating film (4).

8. The pole group assembly according to claim 7, wherein the elevated members (52) are block-shaped, and a plurality of elevated members (52) are arranged at intervals along the length direction of the separator plate (5).

9. Pole group assembly according to claim 1 or 2, characterized in that the housing (1) has a long blade shape, the openings being provided at both ends in the longitudinal direction of the housing (1).

10. A lithium battery comprising the pole group assembly of any one of claims 1-9.