CN220692293U

CN220692293U - Battery shell and cylindrical battery

Info

Publication number: CN220692293U
Application number: CN202322290088.2U
Authority: CN
Inventors: 刘能; 孙宝林; 黄龙
Original assignee: Cornex New Energy Co ltd
Current assignee: Cornex New Energy Co ltd
Priority date: 2023-08-25
Filing date: 2023-08-25
Publication date: 2024-03-29
Anticipated expiration: 2033-08-25

Abstract

The utility model discloses a battery case, comprising: a housing body and a cover plate; the cover plate is connected to the shell body and is provided with a first through hole for injecting liquid; the shell body is cylindrical, and an accommodating space for accommodating the battery cell is formed inside the shell body; the shell body is provided with a first liquid injection channel, one end of the first liquid injection channel is communicated with the first through hole and one end of the accommodating space, which is close to the first through hole, and the other end of the first liquid injection channel is communicated with the other end of the accommodating space, which is far away from the first through hole. According to the utility model, the electrolyte can be injected into the two ends of the battery core, so that the two-way permeation of the electrolyte is realized, the infiltration efficiency of the battery core is improved, and the redundant electrolyte after the electrolyte injection can be kept in the electrolyte injection channel, thereby improving the later cycle performance of the battery.

Description

Battery shell and cylindrical battery

Technical Field

The utility model relates to the field of lithium battery production, in particular to a battery shell and a cylindrical battery.

Background

Currently, lithium batteries are distinguished from many types of batteries by virtue of high energy density, high voltage, wide operating temperature range, long life, and the like. According to the packaging type, lithium batteries are generally classified into cylindrical lithium batteries, square lithium batteries, and pouch batteries, which are widely used due to high product yield of the cylindrical lithium batteries and high consistency of battery packs.

The conventional cylindrical lithium battery is generally manufactured by placing an electric core in a battery shell, assembling parts such as a tab, a current collecting disc, an insulating sheet and the like into the battery shell through hard contact welding, and sealing the battery, wherein the assembled battery can be activated for use after drying, liquid injection and chemical composition.

The current cylindrical battery generally adopts a unidirectional liquid injection structure, for example, the current Chinese patent of publication No. CN216436009U discloses a cylindrical lithium battery, a liquid injection hole is arranged on a cover plate of the positive electrode end or the negative electrode end of the battery, electrolyte is injected into a battery shell in a unidirectional way through the liquid injection hole, and a battery cell is immersed in a penetrating way, and the unidirectional liquid injection structure has a simple structure and can meet the basic liquid injection requirement, but has partial problems in use, for example, the liquid injection hole of the current cylindrical battery is normally biased, the electrolyte is easily distributed unevenly in the battery cell when the unidirectional liquid injection structure is adopted, in addition, the current cylindrical battery generally adopts a coiled battery cell, the pole piece gap in the battery cell is smaller, the infiltration rate of the electrolyte is limited, and when more electrolyte is injected in a single time, the phenomena of local liquid blocking and liquid accumulation are easily caused, so that multiple liquid injection is usually required in actual liquid injection, and the liquid injection efficiency is insufficient.

Disclosure of Invention

The utility model aims to provide a battery shell and a cylindrical battery, which can realize bidirectional permeation and infiltration of electrolyte into a battery cell under the condition of forming a single liquid injection hole, and improve the liquid injection efficiency and the liquid injection uniformity.

In order to solve the technical problems, the utility model is realized by the following technical scheme:

a battery case, comprising: a housing body and a cover plate; the cover plate is connected to the shell body and is provided with a first through hole for injecting liquid; the shell body is cylindrical, and an accommodating space for accommodating the battery cell is formed inside the shell body; the shell body is provided with a first liquid injection channel, one end of the first liquid injection channel is communicated with the first through hole and one end of the accommodating space, which is close to the first through hole, and the other end of the first liquid injection channel is communicated with the other end of the accommodating space, which is far away from the first through hole.

Further, the inner wall of the shell body is recessed outwards to form a groove, and the first liquid injection channel is defined in the groove.

Further, the novel liquid injection device further comprises a cover body, the cover body is sealed to be combined with the outer wall of the housing body, the inner wall of the cover body and the outer wall of the housing body jointly form the first liquid injection channel, and the housing body is provided with a liquid through hole for communicating the accommodating space and the first liquid injection channel.

Further, the cover plates are in a group and are connected to one end of the shell body.

Further, the number of the cover plates is two, the cover plates are respectively connected to two ends of the shell body, and the first through holes are formed in one group of the cover plates.

Further, a second through hole is formed in the cover plate, a second liquid injection channel is further formed in the shell body, one end of the second liquid injection channel is communicated with the second through hole and one end of the containing space, which is close to the second through hole, is communicated with the other end of the second liquid injection channel, and the containing space is far away from the other end of the second through hole.

Further, the second liquid injection channel and the first liquid injection channel are oppositely arranged on the shell body.

Further, the cover plate is connected to the shell body in a sealing manner through laser welding, a current collecting piece is connected to the cover plate, and the current collecting piece is connected to the cover plate through ultrasonic welding.

The cylindrical battery comprises an electric core and the battery shell, wherein the electric core is positioned in the accommodating space, and the cylindrical battery further comprises a liquid injection valve, and the liquid injection valve is connected with the first through hole.

Further, the battery cell is of a winding type structure.

Compared with the prior art, the utility model has the advantages that: through setting up annotating the liquid passageway, can annotate the liquid to electric core both ends, realize the two-way infiltration of electrolyte, improved electric core infiltration efficiency, the unnecessary electrolyte after annotating the liquid can remain annotating the liquid passageway in, and then improves battery later stage cycle performance.

Drawings

Fig. 1 is a schematic structural view of a battery case;

FIG. 2 is a first embodiment of a first and second injection channels;

FIG. 3 is a second embodiment of a first and second injection channels;

fig. 4 is a schematic structural view of a cylindrical battery.

In the figure:

reference numerals: 1. a housing body; 11. an accommodating space; 12. a groove; 13. a cover body; 14. a liquid port; 2. a cover plate; 21. a positive electrode post; 22. a negative electrode column; 23. a current collecting sheet; 24. a tab; 25. an insulating sheet; 26. a first through hole; 27. a second through hole; 3. a first liquid injection channel; 4. a second liquid injection channel; 5. a battery cell; 6. a liquid injection valve; 7. an explosion-proof valve.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element in question 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" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The utility model is described in further detail below with reference to the accompanying drawings:

a first preferred embodiment of the present utility model is:

referring to fig. 1 to 4, a battery case, like the conventional cylindrical battery case existing in the market, includes a case body 1, the case body 1 is entirely cylindrical and has a hollow space 11 therein for accommodating a battery cell 5, a cap plate 2 is connected to an end portion of the case body 1, a positive electrode post 21, a negative electrode post 22, a current collecting plate 23, a tab 24, and an insulating plate 25 are connected to the cap plate 2, and a first through hole 26 is formed in the cap plate 2 for injecting an electrolyte into the case body 1.

Compared with the prior art, the utility model has the following improvement points: the shell body 1 is provided with a first liquid injection channel 3, one end of the first liquid injection channel 3 is communicated with the first through hole 26 and is simultaneously communicated with one end of the accommodating space 11, which is close to the first through hole 26, and the other end of the first liquid injection channel 3 is communicated with the other end of the accommodating space 11, which is far away from the first through hole 26. Through the technical scheme, when the electrolyte is injected, the electrolyte can be injected into the first electrolyte injection channel 3 firstly, the electrolyte is deposited at the bottom of the first electrolyte injection channel 3 under the action of gravity and negative pressure, then enters the accommodating space 11 to permeate and infiltrate one end of the battery cell 5 far away from the first through hole 26, after the electrolyte is continuously injected and fills the first electrolyte injection channel 3, the electrolyte immediately enters the accommodating space 11 from the top of the accommodating space 11 to permeate and infiltrate one end of the battery cell 5 close to the first through hole 26, so that bidirectional infiltration is realized, the electrolyte injection and infiltration efficiency is higher, and in addition, more electrolyte is reserved in the battery through the first electrolyte injection channel 3, so that guarantee is provided for later circulation of the cylindrical battery, and the chemical performance of the battery is improved.

On the basis of the above technical scheme, in order to further improve the liquid injection efficiency, in this embodiment, the cover plate 2 is further formed with a second through hole 27, the housing body 1 is further formed with a second liquid injection channel 4, one end of the second liquid injection channel 4 is communicated with the second through hole 27 and one end of the communication accommodating space 11, which is close to the second through hole 27, and the other end of the second liquid injection channel 4 is communicated with the other end of the accommodating space 11, which is far away from the second through hole 27. Through setting up second notes liquid passageway 4 and second through-hole 27, can be when first through-hole 26 annotates liquid to first notes liquid passageway 3, connect negative pressure device by second through-hole 27, carry out the evacuation to casing body 1 inside is synchronous, the electrolyte infiltration electric core 5 is accelerated to the no break, improves infiltration efficiency, in addition, second through-hole 27 is used for connecting explosion-proof structure after the battery assembly is accomplished, improves the battery security.

In order to improve the uniformity of the electrolyte penetrating into the end of the cell 5, in this embodiment, the second liquid injection channel 4 and the first liquid injection channel 3 are disposed on the housing body 1 opposite to each other.

In view of the variety of molding methods of the first injection channel 3 and the second injection channel 4, two implementation structures will be described in more detail in this embodiment.

The inner wall of the shell body 1 is outwards sunken to form two groups of grooves 12, the first liquid injection channel 3 and the second liquid injection channel 4 are respectively defined in one group of grooves 12, the first liquid injection channel 3 and the second liquid injection channel 4 in the implementation structure can be integrally formed with the shell body 1, the forming is simple, the production cost is lower, but the implementation structure is formed by the sunken shell body 1, the original complete cylindrical structure of the shell body 1 is changed, the structural strength of the shell body 1 is reduced, and the battery leakage or damage is easy to cause.

The lateral wall external connection of casing body 1 has two sets of covers 13, and two sets of covers 13 seal lid and close on casing body 1 and form first notes liquid passageway 3 and second notes liquid passageway 4 with the lateral wall surface of casing body 1 jointly, and the lateral wall of casing body 1 is provided with logical liquid mouth 14 for supply electrolyte in first notes liquid passageway 3 and the second notes liquid passageway 4 to get into accommodation space 11 in the casing body 1. Under the condition that the whole cylindrical structure of the shell body 1 is reserved, the cover 13 is additionally arranged on the outer wall of the shell body 1 to form the first liquid injection channel 3 and the second liquid injection channel 4, so that the structure is high in reliability and good in sealing performance.

It should be noted that, the cylindrical battery is divided into a single cover plate 2 design and a double cover plate 2 design according to specific application requirements, when the single cover plate 2 battery design is adopted, the number of the cover plates 2 is correspondingly one group, the positive electrode posts 21 and the negative electrode posts 22 are connected on the cover plates at the same time, when the double cover plate 2 battery design is adopted, the number of the cover plates 2 is correspondingly two groups, the cover plates 2 are respectively connected at two ends of the shell body 1, and the two groups of cover plates 2 are respectively selected to be connected with the positive electrode posts 21 or the negative electrode posts 22.

In the present embodiment, in order to improve the sealability and insulation performance of the cover plate 2, the cover plate 2 and the case body 1 are sealed by laser welding, and the current collecting plate 23 is connected to the cover plate 2 by ultrasonic welding.

A second preferred embodiment of the present utility model is: the cylindrical battery comprises an electric core 5, a battery shell as shown in a first preferred embodiment, a liquid injection valve 6 and an explosion-proof valve 7, wherein the electric core 5 is positioned in a containing space 11 of the battery shell, the liquid injection valve 6 is arranged in a first through hole 26, and the explosion-proof valve 7 is connected in a second through hole 27. Through the design, the cylindrical battery is high in liquid injection efficiency, good in wettability of the battery cell 5 and good in chemical performance and later-period cycle performance. In the present embodiment, when the battery cell 5 is a winding type battery cell 5, the improvement of the injection efficiency is most remarkable.

The above embodiments are merely illustrative embodiments of the present utility model, but the technical features of the present utility model are not limited thereto, and any changes or modifications made by those skilled in the art within the scope of the present utility model are included in the scope of the present utility model.

Claims

1. A battery housing, characterized in that: comprising the following steps:

a housing body (1) and a cover plate (2);

the cover plate (2) is connected to the shell body (1) and is provided with a first through hole (26) for injecting liquid;

the shell body (1) is cylindrical, and an accommodating space (11) for accommodating the battery cell (5) is formed in the shell body;

the shell body (1) is provided with a first liquid injection channel (3), one end of the first liquid injection channel (3) is communicated with the first through hole (26) and communicated with one end of the accommodating space (11) close to the first through hole (26), and the other end of the first liquid injection channel (3) is communicated with the other end of the accommodating space (11) far away from the first through hole (26).

2. The battery housing of claim 1, wherein: the inner wall of the shell body (1) is outwards sunken to form a groove (12), and the first liquid injection channel (3) is defined in the groove (12).

3. The battery housing of claim 1, wherein: the novel liquid injection device is characterized by further comprising a cover body (13), wherein the cover body (13) is sealed and combined with the outer wall of the shell body (1), the inner wall of the cover body (13) and the outer wall of the shell body (1) jointly form the first liquid injection channel (3), and the shell body (1) is provided with a liquid through hole (14) for communicating the accommodating space (11) and the first liquid injection channel (3).

4. The battery housing of claim 1, wherein: the cover plates (2) are in a group and are connected to one end of the shell body (1).

5. The battery housing of claim 1, wherein: the number of the cover plates (2) is two, the cover plates are respectively connected to two ends of the shell body (1), and the first through holes (26) are formed in one group of the cover plates (2).

6. The battery case according to any one of claims 1 to 5, wherein: the cover plate (2) is provided with a second through hole (27), the shell body (1) is also provided with a second liquid injection channel (4), one end of the second liquid injection channel (4) is communicated with the second through hole (27) and one end of the containing space (11) close to the second through hole (27), and the other end of the second liquid injection channel (4) is communicated with the containing space (11) away from the other end of the second through hole (27).

7. The battery housing of claim 6, wherein: the second liquid injection channel (4) and the first liquid injection channel (3) are oppositely arranged on the shell body (1).

8. The battery housing of claim 6, wherein: the cover plate (2) is connected to the shell body (1) in a sealing mode through laser welding, the cover plate (2) is connected with a current collecting sheet (23), and the current collecting sheet (23) is connected to the cover plate (2) through ultrasonic welding.

9. A cylindrical battery characterized in that: the battery comprises a battery cell (5) and a battery shell as claimed in any one of claims 1-8, wherein the battery cell (5) is positioned in the accommodating space (11), and the battery further comprises a liquid injection valve (6), and the liquid injection valve (6) is connected to the first through hole (26).

10. The cylindrical battery as recited in claim 9, wherein: the battery cell (5) is of a winding type structure.