CN217719779U

CN217719779U - Battery case

Info

Publication number: CN217719779U
Application number: CN202221369310.7U
Authority: CN
Inventors: 罗国纲; 陈俊涛; 冯启枢; 闵幸福; 郭建伟
Original assignee: Apower Electronics Co ltd
Current assignee: Apower Electronics Co ltd
Priority date: 2022-06-01
Filing date: 2022-06-01
Publication date: 2022-11-01
Anticipated expiration: 2032-06-01

Abstract

The utility model relates to a battery technology field discloses a battery case, including shell body, first lid and second lid, the shell body is the hollow columnar structure that both ends set up for the opening, rolls up the core and arranges in the shell body, and first lid sets up in the one end of shell body, and first lid is connected with the electrode connecting portion of rolling up the core, and the second lid sets up in the other end of shell body, and the second lid is connected with the electrode connecting portion of rolling up the core and cooperates first lid to seal to roll up the core in the shell body. The battery shell can ensure that the connection between the electrode connecting part and the positive shell and between the electrode connecting part and the negative cover is firmer, reduce the conditions of short circuit and the like, and improve the quality of finished products.

Description

Battery case

Technical Field

The utility model relates to a battery technology field especially relates to a battery case.

Background

The shell of the prior steel shell button type lithium ion battery mainly comprises an anode shell and a cathode cover body, the battery is sealed by mechanically fastening edges of the anode shell and the cathode cover body, a circular or oval roll core formed by winding a cathode, an anode and a diaphragm is contained in a sealed space, an electrode is formed by an active material coated on a metal current collector, an uncoated metal is left as an electrode connecting part, one end of the anode connecting part is contacted with the bottom wall of the anode shell by pressure, and the other end of the cathode connecting part is connected with the cathode cover plate by welding.

Because the positive pole connecting portion only keeps mutual contact through pressure with positive pole casing after the positive pole casing is put into to the book core, if positive pole connecting portion appear bending or contact failure, the condition such as battery short circuit easily leads to, and finished product quality is not good.

Therefore, it is desired to design a new battery case to improve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery case can ensure that the connection between electrode connecting portion and positive casing and the negative pole lid is more firm, reduces the circumstances such as short circuit, improves the finished product quality.

To achieve the purpose, the utility model adopts the following technical proposal:

a battery housing, comprising:

the outer shell is of a hollow columnar structure with openings at two ends, and the winding core is arranged in the outer shell;

the first cover body is arranged at one end of the outer shell and is connected with the electrode connecting part of the winding core; and

the second cover body is arranged at the other end of the outer shell, is connected with the electrode connecting part of the winding core and is matched with the first cover body to seal the winding core in the outer shell.

Preferably, the first cover body and the second cover body are sequentially welded and fixed to two ends of the outer shell.

Preferably, the inner edges of the openings at the two ends of the outer shell are provided with first mounting grooves, the first cover body and the second cover body are correspondingly arranged in the first mounting grooves, and the end surfaces of the first cover body and the second cover body are flush with the end surface of the outer shell.

Preferably, a second mounting groove is formed in the outer edge of the opening at the two ends of the outer shell, a groove is formed in the end face of the first cover body and the end face of the second cover body, and the first cover body and the second cover body are correspondingly sleeved in the second mounting groove through the groove, and the peripheral sides of the first cover body and the second cover body are flush with the outer wall of the outer shell.

Preferably, the first cover or the second cover is provided with an electrode connection structure.

Preferably, an electrode connecting structure is arranged on the inner wall of the outer shell.

Preferably, the electrode connection structure includes:

the electrode connecting piece is arranged on the surfaces of the first cover body and the second cover body or on the inner wall of the outer shell, a raised connecting part embedded into the through groove is convexly arranged at the center of the electrode connecting piece, and the inner wall of the raised connecting part is connected with the negative connecting part of the winding core;

and the insulating layer is arranged between the electrode connecting sheet and the first cover body or the second cover body.

Preferably, an end surface of the first cover or the second cover facing the outer case is provided with a pressure relief groove.

Preferably, the depth of the pressure relief groove is 35% to 85% of the thickness of the first cover body or the second cover body.

Preferably, a liquid pouring port is formed through an end surface of the first lid member or the second lid member.

The utility model has the advantages that: the utility model provides a pair of battery case has changed the form of original positive pole casing and negative pole lid, with the holistic shell body that has been divided into of shell, first lid and second lid triplex. At first, put into the shell with the book core after accomplishing the coiling, adjust the electrode connecting portion at book core both ends and unfold the exhibition flat, then the one end of welding electrode connecting portion respectively in the one end of first lid, the other end of welding electrode connecting portion in the one end of second lid, connect first lid and second lid respectively on the both ends of shell body again at last to this can ensure that electrode connecting portion and battery case are firm to be connected together, the possibility of short circuit has been reduced, battery encapsulation finished product quality has been improved, the manufacturability of encapsulation has also been improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic top view of a battery case according to an embodiment of the present invention;

FIG. 2 isbase:Sub>A schematic cross-sectional view taken along line A-A of FIG. 1 according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a first cover or a second cover according to a first embodiment of the present invention;

fig. 4 isbase:Sub>A schematic cross-sectional view taken along the linebase:Sub>A-base:Sub>A in fig. 1 according tobase:Sub>A second embodiment of the present invention;

fig. 5 is a schematic side view of a battery case according to a third embodiment of the present invention;

fig. 6 is a schematic cross-sectional view taken along line B-B in fig. 5 according to a third embodiment of the present invention;

fig. 7 is a schematic cross-sectional view of a battery case according to a fourth embodiment of the present invention.

In the figure:

10. an outer housing; 11. a first mounting groove; 12. a second mounting groove;

20. a first cover body; 21. a groove; 22. a pressure relief groove; 23. a liquid injection port;

30. a second cover body;

40. an electrode connection structure; 41. an electrode connecting sheet; 42. a through groove; 43. a bump connecting portion; 44. an insulating layer.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Example one

The battery shell in the prior art is composed of a positive electrode shell and a negative electrode cover body, one end of the positive electrode shell is arranged in an opening mode, a winding core is placed in the positive electrode shell, one end of a positive electrode connecting portion is in contact with the bottom wall of the positive electrode shell, the negative electrode cover body is welded with the other end of the negative electrode connecting portion, the positive electrode shell is in close contact with the positive electrode connecting portion only through the pressure of the negative electrode cover body after the negative electrode cover body is welded to the opening of the positive electrode shell in a sealing mode, if the positive electrode connecting portion is bent or in poor contact, the battery is prone to short circuit and the like, and the quality of a packaged finished product is poor.

In view of the above problems, as shown in fig. 1 to 3, the present embodiment provides a battery case including an outer case 10, a first cover 20, and a second cover 30. The whole of shell body 10 is hollow column structure, and the both ends of shell body 10 are the opening setting, and the shell body 10 is put into to the roll core of coiling shaping through the one end of shell body 10, and first lid 20 sets up the one end at shell body 10, and second lid 30 sets up the other end at shell body 10, can seal the roll core in shell body 10 through first lid 20 and second lid 30.

It can be understood that, in the present embodiment, the original battery case form of the positive electrode case and the negative electrode cover is changed, and the battery case is divided into three parts. When packaging, firstly, the wound core is put into the outer shell 10, and the electrode connecting parts at the two ends of the wound core are adjusted to be unfolded and flattened. Then one end of the electrode connecting part is welded at one end of the first cover body 20, the other end of the electrode connecting part is welded at one end of the second cover body 30, and finally the first cover body 20 and the second cover body 30 are connected to the two ends of the outer shell body 10 respectively, so that the two ends of the electrode connecting part are firmly connected with the outer shell, the possibility of short circuit is reduced, the quality of a battery packaging finished product is improved, and the manufacturability of packaging is also improved.

Further, the first cover body 20 and the second cover body 30 are equal in size or shape, and both are disc-shaped and can cover openings at both ends of the outer casing 10, and the first cover body 20 and the second cover body 30 are sequentially welded and fixed to both ends of the outer casing 10. Specifically, the welding in this embodiment is laser welding, and the focused laser beam has a high power density, a high heating speed, and low possibility of welding stress and deformation, and is suitable for use in welding of the battery case. A molten pool is formed between the outer shell 10 and the first cover body 20 or the second cover body 30 after laser welding, and gaps can be completely blocked after the molten pool is partially cooled and shaped, so that electrolyte leakage is reduced, and the use safety of the battery is improved.

As shown in fig. 1 and 2, in the present embodiment, the inner edges of the openings at the two ends of the outer casing 10 are provided with first mounting grooves 11, and the depth and diameter of the first mounting groove 11 are matched with the thickness and diameter of the first cover body 20 or the second cover body 30. When the first cover body 20 and the second cover body 30 are correspondingly arranged in the first installation groove 11, the end surfaces of the first cover body 20 and the second cover body 30 are flush with the end surface of the outer shell 10, and the connection tightness is further improved by the embedded assembly of the first cover body 20 and the second cover body 30.

In other embodiments, the diameters of the first cover body 20 and the second cover body 30 can be matched with the outer diameter of the outer shell 10, so that the thicknesses of the outer shell 10 are the placing space of the winding core, the width dimension of the built-in winding core is made larger to the maximum extent, and the battery capacity is effectively improved.

As shown in fig. 1 and fig. 2, a circular through groove 42 is formed through the center of the first cover plate or the second cover plate in the present embodiment, an electrode connection structure 40 connected to the negative electrode connection portion is disposed on the first cover body 20 or the second cover body 30, and the electrode connection structure 40 includes an electrode connection sheet 41 and an insulation layer 44. The central portion of the electrode connecting sheet 41 is protruded toward one side with a protruding connecting portion 43 having a circular end face, when the surface of the electrode connecting sheet 41 is attached to the end face of the first cover body 20 or the second cover body 30, the protruding connecting portion 43 is located in the through groove 42, and the end face of the protruding connecting portion 43 is flush with the other end face of the first cover body 20 or the second cover body 30.

It can be understood that, by providing the electrode connecting sheet 41 exposed on the first cover plate or the second cover plate, on one hand, a placing space can be reserved for the battery provided with the battery cell polarity center pillar through the protruding connecting portion 43, so as to utilize the internal space of the battery to the maximum extent, improve the overall energy density of the battery, reduce the cruising ability of the battery, and on the other hand, the protruding electrode connecting sheet 41 can be more easily contacted with the negative electrode of an external circuit, thereby ensuring the safety of the battery in the using process.

Further, the insulating layer 44 is used for connecting the electrode connecting sheet 41 to one side of the outer shell 10 close to the winding core, the insulating layer 44 is emulsion colloid, the insulating layer 44 is disposed at the periphery of the through groove 42 of the first cover body 20 or the second cover body 30 and is formed by dipping, baking, drying or spraying, on one hand, the insulating layer 44 can be used for adhering and fixing the first cover plate or the second cover plate and the electrode connecting sheet 41, and on the other hand, the insulating layer 44 can be adhered to the surface of the first cover plate or the second cover plate to form insulation.

As shown in fig. 3, the end surface of the first cover 20 or the second cover 30 facing the outer housing 10 of the present embodiment is provided with a pressure relief groove 22, the pressure relief groove 22 is disposed in an "S" shape, the radius of the pressure relief groove 22 is 0.15-0.5 mm, and the depth of the pressure relief groove 22 is 35% -85% of the thickness of the first cover 20 or the second cover 30, which is 50% in the present embodiment. The pressure relief groove 22 can release air pressure from the interior of the winding core in time before the battery explodes when the battery is expanded after short circuit occurs inside the battery, so that the possibility of battery explosion is reduced. Of course, in other embodiments, the pressure relief groove 22 may also be in other shapes such as a circle, an ellipse, a rectangle, etc., and the shape of the pressure relief groove 22 is not limited in this embodiment.

As shown in fig. 3, in the present embodiment, a liquid filling port 23 is formed through an end surface of the first lid member 20 or the second lid member 30, the liquid filling port 23 is used for filling the electrolyte into the case, a sealing lid is provided at the liquid filling port 23, and the sealing lid is used to seal and close the liquid filling port 23, so as to ensure the sealing performance at the liquid filling port 23 after the battery is sealed.

The process of packaging the outer case 10 will be described with reference to fig. 1 to 3. First, the first lid body 20 is provided with the through groove 42, and the insulating layer 44 is sprayed so that the electrode connecting sheet 41 is bonded to the surface of the insulating layer 44 and fixed by hot pressing. Then, the winding core is placed in the outer case 10, and the positive electrode connecting portion and the negative electrode connecting portion at both ends of the winding core are adjusted to be flattened, the positive electrode connecting portion is welded and fixed to the bottom wall of the protrusion connecting portion 43, and the negative electrode connecting portion is welded and fixed to the second lid 30. Finally, the first cover body 20 and the second cover body 30 are placed in the first mounting groove 11 and then welded and fixed, thereby achieving battery packaging.

Example two

The battery case provided by the present embodiment is basically the same as the battery case of the first embodiment in structure, and the main difference between the two cases is as follows: as shown in fig. 4, in the present embodiment, the second mounting groove 12 is formed on the outer edge of the opening at the two ends of the outer casing 10, the groove 21 is formed on the end surface of the first cover 20 or the second cover 30, the first cover 20 and the second cover 30 are correspondingly sleeved in the second mounting groove 12 through the groove 21, the peripheral sides of the first cover 20 and the second cover 30 are flush with the outer wall of the outer casing 10, and the sealing performance of the outer casing 10 is better due to the insertion-type assembly of the first cover 20 and the second cover 30.

EXAMPLE III

The battery case provided by the present embodiment is basically the same as the battery case of the first embodiment in structure, and the main difference between the two cases is as follows: as shown in fig. 5 and 6, the through groove 42 of the present embodiment is opened on the peripheral side of the outer casing 10, the electrode connecting structure 40 is disposed on the inner wall of the outer casing 10, and the electrode connecting sheet 41 is set to be arc-shaped and adapted to the outer casing 10, so as to adapt to various types of winding cores, thereby making batteries of different types and types to meet the application requirements of various products.

Example four

The battery case provided by the present embodiment is basically the same as the battery case of the third embodiment in structure, and the main difference between the two cases is that: as shown in fig. 7, the outer housing 10 and the second cover 30 of the present embodiment are integrally formed, so as to form the outer housing 10 with an opening at one end, and the first cover 20 is welded at the opening end of the outer housing 10. After the roll core is placed into the outer shell 10, the electrode connecting part at one end of the roll core is welded with the end face of the first cover body 20, the other end of the roll core is welded with the electrode connecting sheet 41, and the electrode connecting structure 40 is arranged on the peripheral side of the outer shell 10, so that the two ends of the roll core can be welded with the outer shell of the battery, and meanwhile, the visualization of welding spots can be kept during welding, and the welding reliability is guaranteed.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery case, comprising:

the outer shell (10) is of a hollow cylindrical structure with openings at two ends, and the winding core is arranged in the outer shell (10);

the first cover body (20) is arranged at one end of the outer shell (10), and the first cover body (20) is connected with the electrode connecting part of the winding core; and

and the second cover body (30) is arranged at the other end of the outer shell (10), and the second cover body (30) is connected with the electrode connecting part of the winding core and matched with the first cover body (20) to seal the winding core in the outer shell (10).

2. The battery case according to claim 1, wherein the first cover (20) and the second cover (30) are welded and fixed to both ends of the outer case (10) in this order.

3. The battery shell according to claim 2, wherein the opening inner edges of the two ends of the outer shell (10) are provided with first mounting grooves (11), and the first cover body (20) and the second cover body (30) are correspondingly arranged in the first mounting grooves (11) and the end surfaces thereof are flush with the end surface of the outer shell (10).

4. The battery casing according to claim 2, wherein a second mounting groove (12) is formed at the outer edge of the opening at the two ends of the outer casing (10), a groove (21) is formed at the end surface of the first cover body (20) and the second cover body (30), the first cover body (20) and the second cover body (30) are correspondingly sleeved in the second mounting groove (12) through the groove (21), and the peripheral sides of the first cover body and the second cover body are flush with the outer wall of the outer casing (10).

5. The battery case according to claim 1, wherein an electrode connecting structure (40) is provided on the first cover body (20) or the second cover body (30).

6. The battery case according to claim 1, wherein an electrode connecting structure (40) is provided on an inner wall of the outer case (10).

7. The battery case according to claim 5 or 6, wherein the electrode connection structure (40) comprises:

the electrode connecting piece (41), through grooves (42) are formed in the surfaces of the first cover body (20) and the second cover body (30) or the peripheral side of the outer shell body (10), the electrode connecting piece (41) is arranged on the surfaces of the first cover body (20) and the second cover body (30) or the inner wall of the outer shell body (10), a protruding connecting portion (43) embedded into the through grooves (42) is convexly arranged at the center of the electrode connecting piece (41), and the inner wall of the protruding connecting portion (43) is connected with the negative electrode connecting portion of the winding core;

an insulating layer (44) provided between the electrode connecting sheet (41) and the first lid body (20) or the second lid body (30).

8. The battery case according to claim 1, wherein a pressure relief groove (22) is formed in an end surface of the first cover (20) or the second cover (30) facing the outer case (10).

9. The battery case according to claim 8, wherein the depth of the pressure relief groove (22) is 35% to 85% of the thickness of the first cover (20) or the second cover (30).

10. The battery case according to claim 1, wherein a liquid pouring port (23) is formed through an end surface of the first lid member (20) or the second lid member (30).