CN114824601A - Battery sealing structure and battery pack - Google Patents

Abstract

The invention belongs to the technical field of battery packs, and discloses a battery sealing structure and a battery pack. The battery sealing structure in the present invention includes a cover plate assembly, a casing and a first sealing element. The cover plate assembly has a first glue liquid channel, and the inlet end of the first glue liquid channel faces the top of the cover plate assembly and communicates with the outside world. One end of the casing is sleeved on the outer side of part of the cover plate assembly and abuts against the cover plate assembly, the first sealing element is arranged between the cover plate assembly and the casing, and there is a space between the first sealing element, the cover plate assembly and the casing The annular cavity is communicated with the outlet end of the first glue liquid channel. By using the battery sealing structure in this application document, the connection process of the casing and the cover plate assembly is simplified, the reliability is improved, and the welding cost is reduced at the same time. In addition, the first sealing element can prevent the hot melt glue from flowing along the casing. The inner wall flows down and plays a sealing role.

Description

Battery sealing structure and battery pack

technical field

The present invention relates to the technical field of battery packs, in particular to a battery sealing structure and a battery pack.

Background technique

In the battery production process, the top cover and the casing need to be sealed, and the commonly used method is to use laser welding to seal. Laser welding mainly uses the high energy density of the laser beam, and melts the metal at the welding joint through heat conduction to carry out metal welding. After the metal is cooled, the battery top cover and the battery casing are connected and sealed. Laser welding has high requirements on metal types, gaps, surface cleanliness, surface gloss and protective gas at metal joints, and the operation is more complicated, and during the implementation process, there will be many kinds of fried welding, cracks, pores, welding slag splashing, etc. In addition, the laser welding equipment has high purchase cost, high energy consumption, and requires regular maintenance and replacement of key components, resulting in high maintenance costs.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a battery sealing structure, so as to at least solve the problems of complicated and high cost of welding operation between the existing cover plate and the casing.

For this purpose, the present invention adopts the following technical solutions:

A battery sealing structure, comprising:

a cover plate assembly, the cover plate assembly has a first glue liquid channel, and the inlet end of the first glue liquid channel faces the top of the cover plate assembly and communicates with the outside world;

a casing, one end of the casing is sleeved on the outer side of part of the cover plate assembly and abuts against the cover plate assembly;

a first sealing element, the first sealing element is provided between the cover plate assembly and the casing, an annular cavity is formed between the first sealing element, the cover plate assembly and the casing, The annular cavity is communicated with the outlet end of the first glue liquid channel.

In some embodiments of the present invention, the cover plate assembly includes a metal cover plate, a first plastic, a second plastic and a pole terminal, and the metal cover is respectively attached to the first plastic and the second plastic Between the plastics, the pole terminal can pass through the first plastic, the metal cover and the second plastic in sequence and fix the three.

In some embodiments of the present invention, the metal cover plate includes a body portion and an abutting portion sleeved on the outside of the body portion, the casing is sleeved on the outside of the body portion, and the outer side of the casing is sleeved. The top end is in contact with the abutting portion, and the first glue liquid channel is arranged in the body portion.

In some embodiments of the present invention, the cover plate assembly further includes a second sealing element, the second sealing element is disposed between the pole terminal and the body portion, and a top end of the second sealing element Abutting against the first plastic, the bottom end of the second sealing element abuts against the second plastic.

In some embodiments of the present invention, both the first sealing element and the second sealing element are sealing rubber rings.

In some embodiments of the present invention, the first glue liquid channel includes a first communication portion and a second communication portion, and the first communication portion and the second communication portion are vertically arranged.

In some embodiments of the present invention, the liquid inlet direction of the inlet end of the first communication portion is perpendicular to the horizontal direction.

In some embodiments of the present invention, the cover plate assembly has a second glue liquid channel, the inlet end of the second glue liquid channel faces the top of the cover plate assembly and communicates with the outside world, the annular cavity The body is communicated with the outlet end of the second glue liquid channel, and the second glue liquid channel and the first glue liquid channel are arranged symmetrically with respect to the symmetrical plane of the cover plate assembly.

In some embodiments of the present invention, the housing is an aluminum housing.

The present invention also provides a battery pack, including the above-mentioned battery sealing structure.

Beneficial effects of the present invention:

By using the battery sealing structure in this application document, the combined structure of the cover plate assembly, the casing and the first sealing element is adopted, and the operator can inject the hot melt glue into the first glue liquid channel of the cover plate assembly, and Finally, it flows to the annular cavity formed by the first sealing element, the cover plate assembly and the casing, and the cooled hot melt adhesive can firmly bond the cover plate assembly and the casing, which simplifies the casing and the cover plate. The connection process of the components improves the reliability and reduces the welding cost. In addition, the first sealing element can prevent the hot melt adhesive from flowing down the inner wall of the casing, and plays a sealing role.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the battery pack in the present invention;

2 is a cross-sectional view of the battery pack in the direction A-A of FIG. 1;

Fig. 3 is the enlarged view of B part in Fig. 2;

FIG. 4 is an enlarged view of part C in FIG. 2 .

In the picture:

100. Battery pack;

10. Cover plate assembly; 111, body part; 1111, first glue liquid channel; 11111, first connecting part; 11112, second connecting part; 112, abutting part; 12, first plastic; 13, second plastic ; 14, pole terminal; 15, second sealing element;

20. Shell;

30. The first sealing element;

40. Annular cavity.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention.

In the description of the present invention, unless otherwise expressly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this embodiment, the terms "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the drawings, which are only for convenience of description and simplified operation, rather than indicating Or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first" and "second" are only used for distinction in description, and have no special meaning.

FIG. 1 is a schematic diagram of the overall structure of the battery pack in the present invention. FIG. 2 is a cross-sectional view taken along the A-A direction of the battery pack in FIG. 1 . FIG. 3 is an enlarged view of part B in FIG. 2 . FIG. 4 is an enlarged view of part C in FIG. 2 . As shown in Figures 1, 2, 3 and 4, the battery sealing structure in the present invention includes a cover plate assembly 10, a casing 20 and a first sealing element 30. The cover plate assembly 10 has a first glue liquid channel, and the first glue liquid channel is formed in the cover plate assembly 10. The inlet end of the liquid channel faces the top of the cover plate assembly 10 and is communicated with the outside world. Between the assembly 10 and the casing 20 , and between the first sealing element 30 , the cover plate assembly 10 and the casing 20 , there is an annular cavity 40 , and the annular cavity 40 communicates with the outlet end of the first glue liquid channel.

By using the battery sealing structure in this application document, the combined structure of the cover plate assembly 10 , the casing 20 and the first sealing element 30 is adopted, and the operator can inject the hot melt glue into the first glue solution of the cover plate assembly 10 In the channel, and finally flows to the annular cavity 40 formed by the first sealing element 30, the cover plate assembly 10 and the casing 20, the cooled hot melt adhesive can firmly adhere the cover plate assembly 10 and the casing 20. The connection operation simplifies the connection process of the casing 20 and the cover plate assembly 10, improves reliability, and reduces the welding cost at the same time. In addition, the first sealing element 30 can prevent the hot melt adhesive from flowing down the inner wall of the casing 20, acted as a seal.

In some embodiments of the present invention, as shown in FIG. 2 , the cover plate assembly 10 includes a metal cover plate, a first plastic 12 , a second plastic 13 and a pole terminal 14 , and the metal cover is respectively attached to the first plastic 12 . Between the pole terminal 14 and the second plastic 13 , the pole terminal 14 can pass through the first plastic 12 , the metal cover plate and the second plastic 13 in sequence and fix the three. In this embodiment, the first plastic 12 and the second plastic 13 can insulate between the metal cover plate and the pole terminal 14, and the pole terminal 14 can electrically connect the inside and outside of the battery to facilitate current transmission.

In some embodiments of the present invention, as shown in FIGS. 2 and 3 , the metal cover plate includes a main body portion 111 and an abutting portion 112 sleeved outside the main body portion 111 , and the casing 20 is sleeved outside the main body portion 111 and The top end of the housing 20 abuts against the abutting portion 112 , and the first glue liquid channel is provided in the body portion 111 . In this embodiment, the contact between the abutting portion 112 and the top end of the housing 20 can achieve sealing therebetween, and form an annular shape between the body portion 111 , the first sealing element 30 , the abutting portion 112 and the housing 20 . The cavity 40 is used to communicate with the first glue liquid channel, and finally the bonding operation between the casing 20 and the metal cover plate is completed.

Specifically, in other embodiments of the present invention, the first glue liquid channel may also be provided on the abutment portion 112, and the hot melt glue liquid can also be injected into the annular cavity 40, thereby completing the cover plate assembly 10 and the Bonding operation of the case 20 .

In some embodiments of the present invention, as shown in FIG. 2 , the cover plate assembly 10 further includes a second sealing element 15 , the second sealing element 15 is disposed between the pole terminal 14 and the body portion 111 , and the second sealing element 15 The top end of the second sealing element 15 is abutted against the first plastic 12 , and the bottom end of the second sealing element 15 is abutted against the second plastic 13 . In this embodiment, the second sealing element 15 can prevent the electrolyte inside the battery from flowing out of the cover plate assembly 10 , thereby improving the sealing and reliability of the overall battery pack 100 .

In some embodiments of the present invention, both the first sealing element 30 and the second sealing element 15 are sealing rubber rings. In this embodiment, the sealing rubber ring can prevent the hot melt adhesive from flowing down the inner wall of the casing 20, and can also prevent the electrolyte in the battery from flowing out of the cover plate assembly 10, and has the functions of preventing air leakage and preventing liquid leakage. At the same time, because it is made of rubber, it also has the functions of slowing pressure, shockproof and anti-loosening.

In some embodiments of the present invention, as shown in FIG. 3 , the first glue liquid channel includes a first communication part 11111 and a second communication part 11112 , and the first communication part 11111 and the second communication part 11112 are vertically arranged. In this embodiment, when processing the main body portion 111 , the operator can easily process the two-stage connecting portion vertically arranged, which improves the processing convenience.

In some embodiments of the present invention, as shown in FIG. 3 , the liquid inlet direction of the inlet end of the first communication portion 11111 is perpendicular to the horizontal direction. In this embodiment, when the operator injects the hot melt adhesive into the first communication part 11111, since the first communication part 11111 is vertically arranged, the flow direction of the hot melt adhesive is vertical. This makes the hot melt adhesive flow more quickly, facilitates the rapid completion of the liquid injection operation, and improves the operation efficiency.

In some embodiments of the present invention, the cover plate assembly 10 has a second glue liquid channel, the inlet end of the second glue liquid channel faces the top of the cover plate assembly 10 and communicates with the outside world, and the annular cavity 40 is connected to the second glue liquid channel. The outlet ends of the liquid channels are communicated with each other, and the second glue liquid channel and the first glue liquid channel are symmetrically arranged with respect to the symmetry plane of the cover plate assembly 10 . In the present embodiment, the body portion 111 of the cover plate assembly 10 is provided with a first glue liquid channel and a second glue liquid channel, respectively. When the operator performs the liquid injection operation, the annular cavity 40 can be quickly filled, which speeds up the operation. efficiency.

Specifically, in other embodiments of the present invention, multiple glue liquid channels may also be provided, which can also speed up the filling of the annular cavity 40 with the hot melt glue liquid, thereby improving the operation efficiency.

In some embodiments of the present invention, the casing 20 is an aluminum casing, but of course, the casing 20 can also be made of other materials, such as a plastic casing, a steel casing, etc. The material of the casing 20 is not limited in this embodiment.

The present invention also provides a battery pack 100 including the above-mentioned battery sealing structure.

By using the battery pack 100 in this application, the combined structure of the cover plate assembly 10 , the casing 20 and the first sealing element 30 is adopted, and the operator can inject hot melt glue into the first glue solution of the cover plate assembly 10 In the channel, and finally flows to the annular cavity 40 formed by the first sealing element 30, the cover plate assembly 10 and the casing 20, the cooled hot melt adhesive can firmly adhere the cover plate assembly 10 and the casing 20. The connection operation simplifies the connection process of the casing 20 and the cover plate assembly 10, improves the reliability, and reduces the welding cost. In addition, the first sealing element 30 can prevent the hot melt adhesive from flowing down the inner wall of the casing 20, acted as a seal.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. There is no need and cannot be exhaustive of all implementations here. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. a battery sealing structure, is characterized in that, comprises: A cover plate assembly (10), the cover plate assembly (10) is provided with a first glue liquid channel (1111), and the inlet end of the first glue liquid channel (1111) faces the top of the cover plate assembly (10) and communicate with the outside world; a casing (20), one end of the casing (20) is sleeved on the outer side of a part of the cover plate assembly (10) and abuts against the cover plate assembly (10); A first sealing element (30), the first sealing element (30) is provided between the cover plate assembly (10) and the housing (20), the first sealing element (30), the An annular cavity (40) is arranged between the cover plate assembly (10) and the casing (20), and the annular cavity (40) communicates with the outlet end of the first glue liquid channel (1111). 2. The battery sealing structure according to claim 1, wherein the cover plate assembly (10) comprises a metal cover plate, a first plastic (12), a second plastic (13) and a pole terminal (14) , the metal cover plate is respectively attached between the first plastic (12) and the second plastic (13), and the pole terminal (14) can pass through the first plastic (12) in sequence , the metal cover plate and the second plastic (13) and the three are fixed. 3 . The battery sealing structure according to claim 2 , wherein the metal cover plate comprises a main body part ( 111 ) and an abutting part ( 112 ) sleeved outside the main body part ( 111 ). The casing (20) is sleeved on the outer side of the main body part (111), and the top end of the casing (20) is in contact with the abutting part (112), and the first glue liquid channel (1111) is provided in the inside the body part (111). 4 . The battery sealing structure according to claim 3 , wherein the cover plate assembly ( 10 ) further comprises a second sealing element ( 15 ), and the second sealing element ( 15 ) is provided on the pole post. 5 . Between the terminal (14) and the body portion (111), the top end of the second sealing element (15) is in contact with the first plastic (12), and the bottom end of the second sealing element (15) is in contact with the first plastic (12). The second plastics (13) are in contact with each other. 5 . The battery sealing structure according to claim 4 , wherein the first sealing element ( 30 ) and the second sealing element ( 15 ) are both sealing rubber rings. 6 . 6. The battery sealing structure according to claim 1, wherein the first glue liquid channel (1111) comprises a first communication part (11111) and a second communication part (11112), the first communication part (11111) and the second communication part (11112) are arranged vertically. 7 . The battery sealing structure according to claim 6 , wherein the liquid inlet direction of the inlet end of the first communication portion ( 11111 ) is perpendicular to the horizontal direction. 8 . 8 . The battery sealing structure according to claim 1 , wherein the cover plate assembly ( 10 ) has a second glue liquid channel, and the inlet end of the second glue liquid channel faces the cover plate assembly ( 8 . 10) and communicate with the outside world, the annular cavity (40) is communicated with the outlet end of the second glue channel, the second glue channel and the first glue channel (1111) Symmetrical arrangement with respect to the symmetry plane of the cover plate assembly (10). 9. The battery sealing structure according to claim 1, wherein the casing (20) is an aluminum casing. 10. A battery pack, characterized by comprising the battery sealing structure according to any one of claims 1-9.

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