CN220544062U

CN220544062U - Single battery and battery module

Info

Publication number: CN220544062U
Application number: CN202321873734.1U
Authority: CN
Inventors: 刘峰; 兑瀚
Original assignee: Tianjin EV Energies Co Ltd
Current assignee: Tianjin EV Energies Co Ltd
Priority date: 2023-07-17
Filing date: 2023-07-17
Publication date: 2024-02-27
Anticipated expiration: 2033-07-17

Abstract

The utility model provides a single battery and a battery module. The single battery comprises a top cover, a shell and a battery core pack positioned in the shell, wherein the shell is provided with an accommodating space for accommodating the battery core pack, the top cover is arranged at the opening of the shell, and the width of the top cover is smaller than that of the single battery in the width direction; the shell is provided with an explosion-proof valve, and the size of the explosion-proof valve is smaller than 1/4 of the size of the shell in the length direction of the shell. The width of the top cover is smaller than that of the single battery, the space of the welding and printing bulge is compensated, and the overall dimension of the battery core and the space of the module group are ensured. Moreover, the specific explosion-proof valve size can ensure the strength of the shell and simultaneously meet the explosion-proof requirement of the single battery.

Description

Single battery and battery module

Technical Field

The utility model belongs to the field of power batteries, and particularly relates to a single battery and a battery module.

Background

In the prior art, for the rectangular aluminum shell outside the battery, an aluminum shell structure with two open ends is mostly adopted, and the welding of the top cover and the shell generally adopts side welding, and the structure is shown in fig. 1. However, the existing side welding scheme has obvious welding and printing protrusions on the aluminum shell, occupies the space of the module group, and is not beneficial to the improvement of the energy density of the battery.

Moreover, for long single batteries (the length of the shell is greater than or equal to 300 mm) with openings at two ends (namely, two side covers) the side surface area of the single battery is smaller, if the explosion-proof valve is arranged on the top cover, the gas transmission path inside the single battery is too long, and the gas is not easy to be discharged in time.

Disclosure of Invention

In view of the above, the present utility model aims to propose a single battery to solve at least one of the above problems.

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

a single battery comprises a top cover, a shell and a battery core pack positioned in the shell, wherein two ends of the shell are opened,

the shell is provided with an accommodating space for accommodating the battery core pack, the top cover is covered at the opening of the shell, and the width of the top cover is smaller than that of the single battery in the width direction;

the shell is provided with an explosion-proof valve, and the size of the explosion-proof valve is smaller than 1/4 of the size of the shell in the length direction of the shell.

Further, the edge of the top cover is 0.1-0.3mm away from the edge of the single battery.

Further, the battery core package is provided with a pole piece and pole lugs positioned at two ends of the battery core package, and the width of the pole lugs and the width ratio a of the pole piece satisfy the following conditions: a is more than or equal to 60% and less than or equal to 90%.

Further, the battery core package is provided with a pole piece and pole lugs positioned at two ends of the battery core package, and the width of the pole lugs and the width ratio a of the pole piece satisfy the following conditions: a is more than or equal to 60% and less than or equal to 80%.

Further, the ratio b of the width of the tab to the width of the single battery satisfies 60% to 80%.

Further, the shell is provided with a through hole, and the explosion-proof valve is welded on the through hole.

Further, a battery module comprises a single battery as described above.

Compared with the prior art, the single battery has the following advantages:

according to the single battery, the width of the top cover is smaller than that of the single battery, the space of the welding and printing protrusion is compensated, and the overall dimension of the battery core and the space of the module group are ensured. Moreover, the specific explosion-proof valve size can ensure the strength of the shell and simultaneously meet the explosion-proof requirement of the single battery.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

FIG. 1 is a schematic view of the welding position of a top cover and a shell according to the prior art;

FIG. 2 is a schematic view of the top cover and housing positions according to an embodiment of the present utility model;

FIG. 3 is a schematic view of an explosion-proof valve device according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of a tab and a pole piece according to an embodiment of the present utility model.

Reference numerals illustrate:

1. a top cover; 2. a tab; 3. an explosion-proof valve; 4. pole pieces.

Detailed Description

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

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in 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 the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

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 can be understood by those of ordinary skill in the art in a specific case.

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

In the present utility model, the unit cells and the electric cells mean the same meaning, and include a core pack, a case (e.g., an aluminum case) outside the core pack, a top cover, etc., and optionally, an insulating film outside the core pack, etc.

As shown in fig. 2 to 4, a single battery comprises a top cover, a shell and a battery core pack positioned in the shell, wherein two ends of the shell are opened,

the shell is provided with an accommodating space for accommodating the battery core pack, the top cover 1 is covered at the opening of the shell, and the width of the top cover 1 is smaller than the width of the single battery (namely smaller than the width of the shell) in the width direction;

and the shell is provided with an explosion-proof valve 3, and the size of the explosion-proof valve is smaller than 1/4 of the size of the shell in the length direction of the shell.

As shown in FIG. 3, L1 is L0 < 1/4, L0 is the overall length of the housing, and L1 is the length of the explosion-proof valve. The explosion-proof valve is oversized, so that the strength of the shell is greatly reduced, and when the single battery is expanded and deformed or gas is produced inside, the strength of the shell is insufficient to support the expansion force of the single battery, so that the single battery is invalid.

In the utility model, the width of the top cover is smaller than that of the single battery, namely, the outer contour of the top cover is contracted inwards on the basis of the outer surface of the shell, and the width of the top cover is smaller than that of the shell.

In a preferred embodiment of the utility model, the edge of the top cover is 0.1-0.3mm from the edge of the single cell. As shown in fig. 2, the width of the top cap 1 is smaller than the width of the unit cell (case), and the edge of the top cap 1 is 0.1-0.3mm from the edge of the unit cell, that is, the size g in fig. 2 is 0.1-0.3mm.

In a preferred embodiment of the present utility model, the battery core pack is provided with a pole piece 4 and pole lugs 2 positioned at two ends of the battery core pack, and the width ratio a of the pole lugs 2 to the pole pieces 4 satisfies the following conditions: 60% or more and 90% or less of a, as shown in fig. 4, the width of the pole piece 4 is W0, the width of the tab 2 is W1, W1/w0=60 to 90%, preferably, the ratio a of the width of the tab 2 to the width of the pole piece 4 satisfies: a is more than or equal to 60% and less than or equal to 80%. The wide tab has the following advantages: 1. the over-current requirement of the battery during high-rate charge and discharge can be met; in the assembly process, the welding area of the wide lug capable of being welded by ultrasonic and the welding area of the lug 2 directly welded to the cover plate are more abundant than the narrow lug; 2. in the process of manufacturing the battery cell, the foil is fully utilized, waste is reduced, and the laser die cutting efficiency of the tab is improved.

In a preferred embodiment of the present utility model, the ratio b of the width of the tab 2 to the width of the unit cell satisfies: b is more than or equal to 60% and less than or equal to 80%. The width of the single battery comprises: the width of the core pack and the whole shell. The ratio b of the width of the tab 2 to the width of the unit cell satisfies the condition, and has the same advantages as the ratio a of the width of the tab 2 to the width of the pole piece 4 as described above.

In a preferred embodiment of the utility model, the housing is provided with a through hole, and the explosion-proof valve 3 is welded to the through hole.

In a preferred embodiment of the present utility model, the shell is made of an aluminum plate with a thickness of 0.3-1.0 mm.

In a preferred embodiment of the present utility model, the case has a hollow rectangular parallelepiped structure, and the aluminum plate may be bent into a rectangular parallelepiped shape by a die during actual machining.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. A single cell, characterized in that: comprises a top cover, a shell and a battery core pack positioned in the shell, wherein the two ends of the shell are opened,

the shell is provided with an accommodating space for accommodating the battery core pack, the top cover (1) is covered at the opening of the shell, and the width of the top cover (1) is smaller than that of the single battery in the width direction;

the casing is provided with an explosion-proof valve (3), and the size of the explosion-proof valve is smaller than 1/4 of the size of the casing in the length direction of the casing.

2. A single cell according to claim 1, wherein: the edge of the top cover is 0.1-0.3mm away from the edge of the single battery.

3. A single cell according to claim 1, wherein: be equipped with pole piece (4) and be located utmost point ear (2) at battery core package both ends on the battery core package, the width of utmost point ear (2) with the width ratio a of pole piece (4) satisfies: a is more than or equal to 60% and less than or equal to 90%.

4. A single cell according to claim 3, wherein: the ratio a of the width of the tab (2) to the width of the pole piece (4) satisfies: a is more than or equal to 60% and less than or equal to 80%.

5. A single cell according to claim 4, wherein: the ratio b of the width of the tab (2) to the width of the single battery meets the following conditions: b is more than or equal to 60% and less than or equal to 80%.

6. A single cell according to any one of claims 1-5, wherein: the shell is provided with a through hole, and the explosion-proof valve (3) is welded on the through hole.

7. A battery module, characterized in that: comprising a single cell according to any one of claims 1-6.