CN216120417U

CN216120417U - Lithium ion battery

Info

Publication number: CN216120417U
Application number: CN202122389110.XU
Authority: CN
Inventors: 王永明
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2021-09-29
Filing date: 2021-09-29
Publication date: 2022-03-22
Anticipated expiration: 2031-09-29

Abstract

The utility model provides a lithium ion battery, which comprises a shell, at least one pole group and two pole lugs, wherein two ends of the shell in the length direction are respectively provided with an exposed pole column, the shell is internally provided with the at least one pole group, the two pole lugs are respectively arranged at the end parts of the pole group in the length direction of the pole group, the two pole lugs are respectively and electrically connected with the two pole columns through connecting sheets, each connecting sheet comprises a main connecting sheet connected with the pole columns and a secondary connecting sheet connected with the main connecting sheet in a foldable manner, and the pole lugs are fixedly connected with the secondary connecting sheets. According to the lithium ion battery, the exposed pole posts are arranged at the two ends of the shell in the length direction, the internal space of the battery can be effectively utilized, the secondary connecting sheet is connected with the pole lugs, the main connecting sheet is connected with the pole posts, and the size of the connecting sheet can be adaptively changed according to actual requirements, so that the current-carrying requirement of the battery is met.

Description

Lithium ion battery

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a lithium ion battery.

Background

Currently, square batteries are increasingly applied to electric vehicles, private cars and the like due to the advantages of high volume energy density and high safety of the case, and the market proportion is gradually increased. The mainstream of the appearance structure of the square shell in the current market is divided into two main types: a conventional square aluminum shell with one end serving as an output pole and a long shell with two ends serving as output poles.

The square shell of the output pole at the first end of the transmission unit has a large amount of space at the top side due to the thickness of the cover plate and the thickness of the plastic part for protecting the pole lug. Meanwhile, when a long battery is manufactured by using the traditional aluminum shell, the size of the cover plate is along with the side length, the problem that the cover plate is easy to deform and the like is obvious, and the defect rate of manufacturing the long battery is greatly increased.

In the bag body, the space in the width direction or the length direction is far away from the space in the height direction, the traditional battery with the top side pole outlet occupies a large amount of space due to the pole cover plate and the like, and meanwhile, due to the length size of the battery, the utilization rate of the battery in the length direction and the width direction cannot be fully exerted, and how to utilize the space in the width direction or the length direction as much as possible is particularly important. The existing blade battery is the best case for fully utilizing the space in the width direction and the length direction, the traditional top side pole output terminal is changed into a side pole output terminal, the space in the height direction is fully utilized, and meanwhile, the pole position is placed on the space with excessive width or length, so that the energy density level of the bag body is effectively improved.

However, the blade battery can improve the space utilization efficiency of the battery, but the blade battery has many processing problems due to the overlong size, and the cost advantage of the blade battery cannot be effectively utilized.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to a lithium ion battery, so as to improve the utilization rate of the internal space of the battery pack and meet the current-carrying requirements of batteries with different sizes.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows:

a lithium ion battery comprises a shell, wherein exposed pole columns are respectively arranged at two ends of the shell in the length direction; at least one pole set housed within the housing; the two tabs are respectively arranged at the end part of the pole group in the length direction of the pole group, and are electrically connected with the two pole columns through connecting sheets respectively; the connecting piece include with the main connection piece that utmost point post is connected to and can turn over the connection of folding and be in the vice connecting piece on the main connection piece, utmost point ear with vice connecting piece links firmly.

Further, the length of the secondary connecting piece is smaller than that of the primary connecting piece.

Furthermore, the bottom edge of the main connecting sheet and the bottom edge of the auxiliary connecting sheet are arranged in parallel and level, so that the main connecting sheet and the auxiliary connecting sheet form an L shape.

Further, the pole group is formed by stacking or winding pole pieces, and the pole group has a length which is perpendicular to the pole piece stacking direction or extends and is arranged parallel to the winding center line.

Further, the pole group is multiple, and the multiple pole groups are stacked in the thickness direction; the tabs at the same end of each of the pole groups are close to each other and are attached to each other.

Furthermore, the main connecting sheet is eccentrically connected to the pole.

Further, the shell comprises an open lower shell, and a cover plate for covering the top of the lower shell; and gaps extending downwards from the top of the lower shell are arranged at two ends of the lower shell in the length direction, and the mounting plates with the polar columns are assembled on the gaps in a sealing mode.

Further, the main connecting sheet is pre-fixed on the pole.

Furthermore, when the mounting plate is operated to turn over to be assembled in a sealing mode at the notch, the main connecting sheet and the auxiliary connecting sheet are turned over to be parallel to the end face of the pole group in the length direction.

Furthermore, at least one explosion-proof hole is arranged on the cover plate.

Compared with the prior art, the utility model has the following advantages:

according to the lithium ion battery, the exposed pole posts are arranged at the two ends of the shell in the length direction, the internal space of the battery can be effectively utilized, the secondary connecting sheet is connected with the pole lugs, the main connecting sheet is connected with the pole posts, the size of the connecting sheet can be adaptively changed according to actual requirements, and therefore current-carrying requirements of batteries with different sizes are met.

In addition, the pole group is made of stacked or wound pole pieces, so that the energy density of the battery can be improved while the internal space of the battery is effectively utilized.

In addition, aiming at the condition of the multi-pole group, the connecting sheet is connected with the pole in an eccentric mode, so that when the turnover connecting sheet is connected with the pole, the connecting sheet is more favorable for being positioned in the middle of the pole, and the flow guide capability of the connecting sheet after being connected with the pole is ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model, illustrate embodiments of the utility model and together with the description serve to explain the utility model, and the description is given by way of example only and without limitation to the terms of relative positions. In the drawings:

fig. 1 is a schematic diagram of an overall structure of a lithium ion battery according to an embodiment of the present invention;

fig. 2 is an exploded view of a lithium ion battery according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a multi-pole group according to an embodiment of the present invention;

FIG. 4 is a schematic view of an integrated structure of a connecting sheet according to an embodiment of the utility model;

fig. 5 is a schematic diagram of a separated structure of a connecting sheet according to an embodiment of the utility model.

Description of reference numerals:

1. a housing; 101. a lower housing; 1011. opening the gap; 102. a cover plate; 1021. an explosion-proof hole; 1022. a liquid injection hole; 103. mounting a plate; 1031. a pole column; 2. a pole group; 201. a tab; 2011. a main connecting sheet; 2012. and a secondary connecting sheet.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inside", "outside", etc. appear, they are based on the orientation or positional relationship shown in the drawings and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In its entirety, it comprises a casing 1, at least one pole group 2, and two tabs 201. Wherein, two ends of the housing 1 in the length direction are respectively provided with an exposed pole 1031, the two pole 1031s are respectively a positive pole 1031 and a negative pole 1031, and at least one pole group 2 is accommodated in the housing 1.

Wherein, two utmost point ears 201 are respectively through two utmost point posts 1031 of connection piece electric connection, specifically speaking, the connection piece includes the main connection piece 2011 of being connected with utmost point post 1031 to and can turn over the vice connection piece 2012 of the connection on main connection piece 2011 of rolling over, utmost point ear 201 links firmly with vice connection piece 2012. It should be noted that the tab 201 may be connected to the connecting plate by welding.

As above structure is equipped with exposed utmost point post 1031 at casing 1 length direction's both ends, can effectively utilize the battery inner space, is connected with utmost point ear 201 through vice connection piece 2012 to be connected main connection piece 2011 and utmost point post 1031, and can be according to the size of actual demand adaptability change connection piece, thereby satisfy the current-carrying demand of not unidimensional battery.

Based on the above overall design, as shown in fig. 1 to 5, in an exemplary structure of the lithium ion battery of the embodiment, specifically, the main connecting piece 2011 may be prefabricated integrally with the terminal 1031 in two manners shown in fig. 4, one manner is that the secondary connecting piece 2012 is folded and connected to the main connecting piece 2011, and the bottom edge of the main connecting piece 2011 and the bottom edge of the secondary connecting piece 2012 are arranged in parallel, so that the main connecting piece 2011 and the secondary connecting piece 2012 form an L shape. And the second is that the auxiliary connecting sheet 2012 is arranged on the main connecting sheet 2011, so that the whole body is I-shaped. In addition, the main connecting piece 2011 and the pole 1031 are integrally prefabricated, and riveting or laser welding can be adopted.

It should be noted that if the auxiliary connecting piece 2012 is connected to the main connecting piece 2011 in a folding manner, a flexible connecting portion that can be bent is provided between the main connecting piece 2011 and the auxiliary connecting piece 2012.

In addition, the main connecting piece 2011 may be provided separately from the pole 1031 as shown in fig. 5, and if the main connecting piece 2011 is separately provided, the sub connecting piece 2012 needs to be welded to the pole 201 first, and then the main connecting piece 2011 needs to be laser welded to the pole 1031. The length of the secondary connecting piece 2012 is less than that of the primary connecting piece 2011, and the connecting piece may be a single-layer metal sheet or a multi-layer metal sheet formed by folding, and in this embodiment, preferably, the thickness of the connecting piece is 0.02mm to 2 mm. In addition, the welding size of the connecting sheet can be adaptively changed according to the size of the tab 201 so as to meet the size requirements of different forms, thereby meeting the current-carrying requirements of different batteries.

It should be noted that the pole group 2 is formed by stacking or winding pole pieces, and the pole group 2 has a length extending perpendicular to the stacking direction of the pole pieces or parallel to the winding center line, and the two tabs 201 are electrically connected to the two poles 1031 through connecting sheets respectively.

As shown in fig. 3, the number of the pole groups 2 may be one or more, in this embodiment, the number of the pole groups 2 is two, two pole groups 2 are stacked in the thickness direction, and the tabs 201 at the same end of each pole group 2 are close to and attached to each other. It should be noted that the number of the pole groups 2 can be adjusted according to the actual use condition, and correspondingly, the size of the casing 1 can be adjusted adaptively according to the number of the pole groups 2, so as to ensure the utilization rate of the internal space of the battery.

Specifically, the casing 1 includes an open lower casing 101, and a cover plate 102 covering the top of the lower casing 101, wherein the cover plate 102 may be made of an aluminum plate. Further, notches 1011 extending downward from the top of the lower case 101 are provided at both ends of the lower case 101 in the longitudinal direction, and the mounting plate 103 having the pole 1031 is hermetically attached to the notches 1011. In assembling the battery case 1, the cover plate 102 is welded to the lower case 101 to form a square case having both ends open, and then the mounting plate 103 is assembled with the molded lower case 101 and cover plate 102 to constitute the sealed case 1.

As can be understood, the terminal 1031 is assembled on the mounting plate 103, and the end of the terminal 1031 is exposed out of the mounting plate 103, so that the utilization rate of the internal space of the battery can be optimized, and the energy density of the battery pack can be improved.

In addition, when a battery made of the cell group 2 is used, the tab may be located at the middle position of the terminal 1031. And to the condition of two or more utmost point group 2 that set up at this embodiment, the connection piece adopts eccentric mode to be connected with utmost point post 1031 for when turning over the connection piece and being connected with utmost point post 1031, more be favorable to the connection piece to be located the intermediate position of utmost point post 1031, thereby guarantee the water conservancy diversion ability after connection of connection piece and utmost point post 1031. In the embodiment, as shown in fig. 3, the electrode tabs 201 at two ends of two adjacent electrode groups 2 are deflected in opposite directions, so as to improve the space utilization rate inside the battery. In addition, it is worth mentioning that the area of the tab 201 on the electrode group 2 can be adaptively designed according to the actual required current carrying capacity.

In order to ensure the flow guiding effect after the connection between the tab and the terminal 1031, the tab is pre-fixed to the terminal 1031, and in order to fix the tab and the terminal 1031, as a preferred embodiment, the tab is pre-fixed to the terminal 1031 in a riveting or laser welding manner. Through the mode of connection piece pre-fixing on utmost point post 1031, it is more convenient in the installation to can guarantee the connection water conservancy diversion effect between connection piece and utmost point post 1031, guarantee product quality.

In this embodiment, when the mounting plate 103 is turned over to be assembled in the notch 1011 in a sealing manner, the plane of the connecting sheet fixedly connected with the tab 201 is parallel to the end surface of the electrode group 2 in the length direction. In specific implementation, the tab 201, the terminal 1031 and the connecting piece may be ultrasonically welded, the terminal 1031 is bent, the connecting piece of the terminal 1031 is attached to the end surface of the electrode group 2 in parallel, and the mounting plate 103 is hermetically assembled with the notch 1011, so as to ensure the current carrying capacity of the tab 201.

In order to ensure the insulation between the tab 201 and the housing 1, an insulation coating is covered on the fastening area of the tab 201 and the connecting sheet. Or, means such as rubberizing and coating of an insulating film can be performed in the fixedly connected region of the tab 201 and the connecting sheet, or a combination of the two insulating means is adopted, so that effective and reliable insulation is performed between the tab 201 and the shell 1, and further the product quality and the using effect are ensured.

In addition, at least one explosion-proof hole 1021 is provided in the lid plate 102, and a liquid injection hole 1022 for injecting an electrolyte is provided in the lid plate 102. Through setting up explosion-proof hole 1021, can release the inside gas of casing 1, avoid 1 internal pressure of casing too big and the emergence explosion, improve the security of battery to be favorable to guaranteeing product quality.

This embodiment lithium ion battery, 1 length direction's of casing both ends expose utmost point post 1031, can effectively utilize the battery inner space to can improve the current-carrying capacity of battery, in addition, utmost point group 2 adopts the pole piece of piling up or coiling to make, when effectively utilizing the battery inner space, can improve the energy density of battery, the welding dimension of connection piece can carry out the adaptability according to utmost point ear 201's size and change, with the size demand that satisfies different forms, thereby satisfy the current-carrying demand of different batteries.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A lithium ion battery, characterized by comprising:

the terminal comprises a shell (1), wherein exposed pole columns (1031) are respectively arranged at two ends of the shell (1) in the length direction;

at least one pole group (2) housed inside the casing (1);

the two pole lugs (201) are respectively arranged at the end parts of the pole group (2) in the length direction of the pole group (2), and the two pole lugs (201) are electrically connected with the two pole columns (1031) through connecting sheets respectively; the connection piece include with main connection piece (2011) that utmost point post (1031) are connected to and can turn over the connection of folding and be in vice connection piece (2012) on main connection piece (2011), utmost point ear (201) with vice connection piece (2012) link firmly.

2. The lithium ion battery of claim 1, wherein: the length of the secondary connecting sheet (2012) is less than that of the primary connecting sheet (2011).

3. The lithium ion battery of claim 2, wherein: the bottom edge of the main connecting piece (2011) and the bottom edge of the auxiliary connecting piece (2012) are arranged in a flush mode, so that the main connecting piece (2011) and the auxiliary connecting piece (2012) form an L shape.

4. The lithium ion battery of claim 1, wherein: the pole group (2) is formed by stacking or winding pole pieces, and the pole group (2) has a length which is perpendicular to the pole piece stacking direction or extends and is parallel to the winding center line.

5. The lithium ion battery of claim 1, wherein: the number of the pole groups (2) is multiple, and the pole groups (2) are stacked in the thickness direction; the pole lugs (201) at the same end of each pole group (2) are close to each other and are attached to each other.

6. The lithium ion battery of claim 2, wherein: the main connecting piece (2011) is eccentrically connected to the pole (1031).

7. The lithium ion battery of any of claims 1 to 6, wherein: the shell (1) comprises an open lower shell (101) and a cover plate (102) covering the top of the lower shell (101); and notches (1011) extending downwards from the top of the lower shell (101) are arranged at two ends of the lower shell (101) in the length direction, and the installing plates (103) with the poles (1031) are assembled on the notches (1011) in a sealing mode.

8. The lithium ion battery of claim 7, wherein: the main connecting piece (2011) is pre-fixed on the pole (1031).

9. The lithium ion battery of claim 7, wherein: because of the operation the mounting panel (103) upset is in with sealed assembly when opening (1011), main connection piece (2011) with vice connection piece (2012) turn over and turn over, with the parallel utmost point group (2) length direction's terminal surface.

10. The lithium ion battery of claim 7, wherein: at least one explosion-proof hole (1021) is arranged on the cover plate (102).