Aluminum shell battery

Abstract

The utility model discloses an aluminum shell battery which comprises a shell, a battery cell and a collector plate, the shell is provided with an inner cavity, the battery cell is arranged in the inner cavity, and the battery cell is connected with the shell through the collector plate; wherein a first accommodating groove is formed in the bottom wall of the inner cavity, a second accommodating groove is formed in one side, far away from the battery core, of the current collecting disc, and the first accommodating groove and the second accommodating groove are oppositely arranged and are communicated with each other and are spliced through colloid. The first containing groove is formed in the shell, the second containing groove is formed in the flow collecting disc, then the colloid is placed in the first containing groove and the second containing groove, when the flow collecting disc makes contact with the bottom wall of the inner cavity, the first containing groove and the second containing groove are spliced and communicated, and the colloid is melted and flows through heating; the first containing groove and the second containing groove are fully filled, so that the flow collecting disc and the bottom wall of the inner cavity are connected more tightly, a gap between the flow collecting disc and the bottom wall is reduced, the welding effect and the superior product rate of the flow collecting disc and the inner cavity are improved, and meanwhile cost increase caused by material waste is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and in particular to an aluminum shell battery. Background Art

[0002] Lithium-ion batteries have many advantages and are in line with current green environmental protection requirements. Therefore, lithium-ion batteries are widely used. Large cylindrical full-ear aluminum shell batteries are a type of lithium battery. Common aluminum shell batteries have double-pass structures and single-pass structures. The single-pass structure has a higher energy density, so the single-pass aluminum shell battery is more popular.

[0003] The bottom of the aluminum shell battery is also connected to a current collecting plate. Conventionally, the two are connected by laser penetration welding. There is often a gap between the current collecting plate and the bottom of the aluminum shell battery, and this gap will directly affect the subsequent welding effect, resulting in an increase in the defective rate, causing material waste and increased costs. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides an aluminum shell battery.

[0005] The utility model discloses an aluminum shell battery, comprising: a shell, a battery core and a current collecting plate, wherein the shell has an inner cavity, the battery core is arranged in the inner cavity, and the battery core is connected to the shell through the current collecting plate;

[0006] Among them, a first accommodating groove is opened on the bottom wall of the inner cavity, and a second accommodating groove is opened on the side of the current collecting plate away from the battery core. The first accommodating groove and the second accommodating groove are arranged opposite to each other and communicated with each other, and the first accommodating groove and the second accommodating groove are spliced ​​by colloid.

[0007] According to one embodiment of the present invention, the groove width of the second accommodating groove is smaller than the groove width of the first accommodating groove.

[0008] According to one embodiment of the present invention, the width of the first receiving groove is 2 mm-4 mm.

[0009] According to one embodiment of the present invention, the groove depth of the first receiving groove is 0.05mm-0.15mm.

[0010] According to one embodiment of the present invention, the width of the second receiving groove is 1 mm-3 mm.

[0011] According to one embodiment of the present invention, the depth of the second receiving groove is 0.05 mm-0.15 mm.

[0012] According to an implementation of the utility model, the colloid is made of hot melt adhesive material.

[0013] According to one embodiment of the present invention, the hot melting temperature of the colloid is 50°C-100°C.

[0014] According to one embodiment of the present invention, an air-avoiding groove is provided on the outer surface of the shell, and the air-avoiding groove and the current collecting plate are located at the same end of the shell.

[0015] According to one embodiment of the present invention, the thickness of the end of the shell is H, and the depth of the air avoidance groove is h, wherein h=H*K, K=30%-50%.

[0016] The beneficial effect of the utility model lies in that a first receiving groove is opened in the shell and a second receiving groove is opened in the collecting plate, and then the colloid is placed in the first receiving groove and the second receiving groove. When the collecting plate contacts the bottom wall of the inner cavity, the first receiving groove and the second receiving groove are spliced ​​and communicated with each other, and the colloid is melted and flowed by heating to fill the first receiving groove and the second receiving groove, so that the collecting plate and the bottom wall of the inner cavity are more tightly connected, and the gap between the two is reduced, thereby improving the welding effect and the quality rate of the two, and avoiding the cost increase caused by material waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 It is a partial cross-sectional view of an aluminum shell battery;

[0019] Figure 2 Schematic diagram of the bottom of the aluminum shell battery.

[0020] Description of Reference Numerals

[0021] 1-shell; 11-inner cavity; 12-first receiving groove; 13-air-avoiding groove;

[0022] 2-Battery cell;

[0023] 3-current collecting plate; 31-second receiving tank;

[0024] 4- Colloid. DETAILED DESCRIPTION

[0025] The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0026] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present utility model. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0027] Embodiment 1

[0028] like Figure 1 and Figure 2 As shown, Figure 1 It is a partial cross-sectional view of an aluminum shell battery; Figure 2 The bottom schematic diagram of the aluminum shell battery. The aluminum shell battery of the present application includes a shell 1, a battery cell 2, a current collecting plate 3 and a colloid 4. The shell 1 has an inner cavity 11, the battery cell 2 is arranged in the inner cavity 11, and the current collecting plate 3 is also arranged in the inner cavity 11. One side of the current collecting plate 3 is connected to the battery cell 2, and the other side of the current collecting plate 3 is connected to the bottom wall of the inner cavity 11. The colloid 4 is used to connect the current collecting plate 3 with the bottom wall of the inner cavity 11. It should be noted that the inner cavity 11 uses the side close to the end of the shell 1 as the bottom wall.

[0029] In specific application, a first receiving groove 12 is provided on the bottom wall of the inner cavity 11, a second receiving groove 31 is provided on the side of the bottom wall of the current collecting plate 3 facing the inner cavity 11, and the colloid 4 is arranged in the first receiving groove 12 and the second receiving groove 31; it can be understood that when the current collecting plate 3 is placed on the bottom wall of the inner cavity 11, the first receiving groove 12 is communicated with the second receiving groove 31, and the first receiving groove 12 and the second receiving groove 31 are spliced ​​and fixed by the colloid 4. Preferably, the groove width of the first receiving groove 12 is greater than the groove width of the second receiving groove 31, which is conducive to further reducing the distance between the current collecting plate 3 and the bottom wall of the inner cavity 11. In this embodiment, the groove width of the first receiving groove 12 is 2mm-4mm, and the groove depth of the first receiving groove 12 is 0.05mm-0.15mm; the groove width of the second receiving groove 31 is 1mm-3mm, and the groove depth of the second receiving groove 31 is 0.05mm-0.15mm. Specifically, the width of the first receiving groove 12 is 2 mm, the depth of the first receiving groove 12 is 0.05 mm, the width of the second receiving groove 31 is 1 mm, and the depth of the second receiving groove 31 is 0.05 mm. It should also be noted that the groove width refers to the distance between the two groove walls of the first receiving groove 12 or the second receiving groove 31 in the horizontal direction; the groove depth refers to the distance between the groove bottom and the groove opening of the first receiving groove 12 or the second receiving groove 31 in the vertical direction.

[0030] Furthermore, the outer surface of the shell 1 is also provided with an air avoidance groove 13, which is located at the end of the shell 1, and the air avoidance groove 13 is opened in the direction close to the current collecting plate 3. When in use, the current collecting plate 3 is welded to the bottom wall of the inner cavity 11 by laser penetration welding technology, and the laser passes through the air avoidance groove 13 before welding. In specific application, the thickness of the end of the shell 1 is H, and the groove depth of the air avoidance groove 13 is h. The groove depth h of the air avoidance groove 13 must be less than the thickness H of the end of the shell 1, wherein h = H*K, K = 30%-50%. In this way, the thickness difference between the end of the shell 1 and the current collecting plate 3 is reduced, and the phenomenon of cold welding or over welding is not easy to occur during laser welding, which is conducive to improving the welding effect and the quality rate after welding. The opening shape of the air avoidance groove 13 is not specifically limited here, that is, the air avoidance groove 13 only needs to be provided with a welding extension of the bottom of the current collecting plate 3 and the inner cavity 11, and the cross-sectional shape of the air avoidance groove 13 can be circular, square, continuous, or discontinuous.

[0031] In this embodiment, the colloid 4 is an existing hot melt adhesive, which may or may not be conductive. In order to avoid damage to the battery cell 2, the hot melt adhesive used for the colloid 4 has a hot melting temperature of 50°C-100°C.

[0032] To summarize, a first receiving groove 12 is opened in the shell 1 and a second receiving groove 31 is opened in the collecting plate 3, and then the colloid 4 is placed in the first receiving groove 12 and the second receiving groove 31. When the collecting plate 3 contacts the bottom wall of the inner cavity 11, the first receiving groove 12 and the second receiving groove 31 are spliced ​​and communicated with each other. The colloid 4 is melted and flowed by heating to fill the first receiving groove 12 and the second receiving groove 31, so that the collecting plate 3 and the bottom wall of the inner cavity 11 are more tightly connected, and the gap between the two is reduced, thereby improving the welding effect and the quality rate of the two, and avoiding the cost increase caused by material waste.

[0033] Embodiment 2

[0034] The difference between this embodiment and the first embodiment is that in this embodiment, the width of the first receiving groove 12 is 3 mm, and the width of the second receiving groove 31 is 2 mm.

[0035] Embodiment 3

[0036] The difference between this embodiment and the first embodiment is that in the embodiment, the width of the first receiving groove 12 is 3 mm, and the width of the second receiving groove 31 is 3 mm.

[0037] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. An aluminum shell battery, It is characterized in that include: A shell (1), a battery cell (2) and a current collecting plate (3), wherein the shell (1) has an inner cavity (11), the battery cell (2) is arranged in the inner cavity (11), and the battery cell (2) is connected to the shell (1) via the current collecting plate (3); The bottom wall of the inner cavity (11) is provided with a first receiving groove (12), and the side of the current collecting plate (3) away from the battery cell (2) is provided with a second receiving groove (31), the first receiving groove (12) and the second receiving groove (31) are arranged opposite to each other and are in communication with each other, and the first receiving groove (12) and the second receiving groove (31) are spliced ​​together by a colloid (4).

2. The aluminum shell battery according to claim 1, It is characterized in that The groove width of the second accommodating groove (31) is smaller than the groove width of the first accommodating groove (12).

3. The aluminum shell battery according to claim 1, It is characterized in that The width of the first accommodating groove (12) is 2 mm-4 mm.

4. The aluminum shell battery according to claim 3, It is characterized in that The first containing groove (12) has a groove depth of 0.05 mm-0.15 mm.

5. The aluminum shell battery according to claim 1, It is characterized in that The width of the second receiving groove (31) is 1 mm-3 mm.

6. The aluminum shell battery according to claim 5, It is characterized in that The second receiving groove (31) has a groove depth of 0.05 mm-0.15 mm.

7. The aluminum shell battery according to claim 1, It is characterized in that The colloid (4) is made of hot melt adhesive material.

8. The aluminum shell battery according to claim 1, It is characterized in that The hot melting temperature of the colloid (4) is 50°C-100°C.

9. The aluminum shell battery according to any one of claims 1 to 8, It is characterized in that An air avoidance groove (13) is provided on the outer surface of the shell (1), and the air avoidance groove (13) and the current collecting plate (3) are located at the same end of the shell (1).

10. The aluminum shell battery according to claim 9, It is characterized in that The thickness of the end of the shell (1) is H, and the depth of the air avoidance groove (13) is h, wherein h=H*K, and K=30%-50%.

Images