Battery and battery pack

Abstract

The utility model relates to a battery and a battery pack. According to the battery, the outer side face of the battery is coated with a glue line, and the glue coating track of the glue line comprises at least two sets of track units; in any group of track units, each track unit comprises m first gluing lines in a linear track and n second gluing lines in a linear track, and n is equal to (m-1); and the third gluing line is arranged between the first gluing lines in the two groups of track units. According to the novel design, the glue applying track can meet the requirement for the glue pressing area under the theoretical glue applying weight condition, the glue overflowing phenomenon is avoided, the production glue scraping process is reduced, and the production efficiency is improved; and meanwhile, under the same gluing weight, the pressing-open area of the track is better than that of the existing gluing track, the risk that the battery plane is concave inwards to form a cavity is made up, the influence of stress generated by glue between the cavities on the battery performance is reduced, and the structural strength between the batteries is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery and a battery pack. Background Art

[0002] With the development of science and technology, in order to meet our daily travel needs, lithium batteries with higher energy density are needed in the field of automobile loading. High-energy lithium batteries are filled with other substances inside the battery, which can easily lead to poor flatness of the battery shell and a concave shape. Therefore, according to the original gluing trajectory (S-shaped, Z-shaped, N-shaped), the battery is easily squeezed by force, which can easily cause the glue on both sides to be thin and the glue in the middle cannot be pressed open, and cavities are prone to appear in some concave parts, which in turn affects the structural strength between the batteries and their own electrical performance; if the above problems are solved by increasing the overall amount of glue, it is easy to cause the glue to overflow to the bottom of the battery, affecting the flatness of the bottom of the module; or, the glue is easy to overflow to the top of the battery, affecting the welding effect, and there is an additional glue scraping process, which in turn affects the production efficiency. Therefore, a new gluing trajectory is urgently needed to solve the above problems. Utility Model Content

[0003] In order to overcome at least one defect of the above-mentioned prior art, according to one aspect of the utility model, a battery is provided. By optimizing the gluing track, a gluing track with strong practicality and wide application range is designed. Compared with other tracks, it uses less glue and has better pressing effect, thereby ensuring the structural strength between batteries and reducing production costs.

[0004] A battery, wherein a glue line is coated on an outer side of the battery, and the glue coating track of the glue line includes:

[0005] At least two groups of track units; in any group of the track units, the track units include m first glue-coated lines in straight track and n second glue-coated lines in straight track, wherein n=m-1; each of the first glue-coated lines has an upper end and a lower end, and one of the second glue-coated lines is connected between the upper end of one of the first glue-coated lines and the lower end of the first glue-coated line of the other adjacent one;

[0006] The third glue coating line is arranged between the first glue coating lines in the two groups of track units.

[0007] In one embodiment of the present invention, one of the track units is in an “N”-shaped track as a whole, and the other track unit is in an “И”-shaped track as a whole.

[0008] In one embodiment of the present invention, the third glue coating line is connected between the upper ends of the first glue coating lines respectively and adjacently arranged in the two groups of the track units;

[0009] Alternatively, the third glue coating line is connected between the lower ends of the first glue coating lines respectively and adjacently arranged in the two groups of track units.

[0010] In an embodiment of the present invention, the third glue coating line is an arc-shaped track.

[0011] In an embodiment of the present invention, the two track units are both in an “N”-shaped track or an “И”-shaped track as a whole.

[0012] In one embodiment of the utility model, the third glue coating line includes two third glue coating line segments 1 in the form of arc tracks and one third glue coating line segment 2 in the form of a straight track and arranged between the two third glue coating line segments 1;

[0013] The third glue coating line segment 2 of one of them is connected to the upper end of one of the first glue coating lines respectively and adjacently arranged in the two groups of track units, and the third glue coating line segment 2 of the other one is connected to the lower end of the other first glue coating line respectively and adjacently arranged in the two groups of track units.

[0014] In an embodiment of the present invention, in the length direction of the battery, the distance d1 between the outermost first glue coating line in the track unit and the side edge of the adjacent battery is in the range of: 25mm≤d1≤35mm.

[0015] In an embodiment of the present invention, in the length direction of the battery, in any group of the track units, the distance d2 between two of the first glue coating lines is in the range of: 45mm≤d2≤55mm.

[0016] In one embodiment of the utility model, in the height direction of the battery, the first glue coating line is extended along the height direction of the battery; assuming that the height of the battery is h1, the distance between the upper end of the first glue coating line and the top of the battery is h2=0.1h1, the distance between the lower end of the first glue coating line and the bottom of the battery is h3=0.2h1, and the height of the first glue coating line itself is h4=0.7h1.

[0017] According to another aspect of the present application, a battery pack is provided, comprising the above-mentioned battery, wherein the glue line is arranged on the respective large surfaces of two adjacent batteries arranged facing each other, and foam for bonding between batteries is arranged on the large surfaces on the same side of the batteries.

[0018] In summary, the battery and battery pack provided by the utility model have the following technical effects:

[0019] The gluing track of the glue line coated on the outer surface of the battery can form a continuous gluing track. The newly designed gluing track can meet the glue pressing area under the theoretical glue application weight without causing glue overflow, thereby reducing the production scraping process and speeding up production efficiency. At the same time, under the same glue application weight, the track pressing area is better than the "S-shaped, Z-shaped, and N-shaped" gluing track, which compensates for the risk of cavities appearing in the concave surface of the battery, reduces the influence of stress generated by glue between cavities on battery performance, and increases the structural strength between batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the glue coating track on the outer side surface of the battery according to an embodiment of the utility model;

[0021] Figure 2 It is another structural schematic diagram of the glue coating track on the outer side surface of the battery according to the embodiment of the utility model;

[0022] Figure 3 Another structural schematic diagram of the glue coating track on the outer side surface of the battery according to the embodiment of the utility model;

[0023] Figure 4 A schematic diagram of a structure of a plurality of battery stacks according to an embodiment of the utility model;

[0024] Figure 5 It is another structural schematic diagram of the glue coating track on the outer side surface of the battery according to the embodiment of the utility model;

[0025] Figures: 1-battery, 21-first glue coating line, 22-second glue coating line, 23-third glue coating line, 231-third glue coating line segment one, 232-third glue coating line segment two, 3-foam. DETAILED DESCRIPTION

[0026] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0029] The embodiment of the utility model discloses a battery 1, in particular a square battery, which can be referred to Figure 1-Figure 4 The specific implementation manner shown is provided to better understand the technical solution of the battery 1.

[0030] In the present battery 1 , a glue line is coated on the outer surface of the battery 1 . The glue coating track of the glue line is a newly designed glue coating track of the present battery 1 according to the existing problems. The glue coating track can generally include a track unit and a third glue coating line 23 .

[0031] The number of the track units is set to at least two groups. In any group of track units, the track unit includes m first glue-coated lines 21 in straight track and n second glue-coated lines 22 in straight track, where n=m-1; each first glue-coated line 21 has an upper end and a lower end, and one second glue-coated line 22 is connected between the upper end of one adjacent first glue-coated line 21 and the lower end of another first glue-coated line 21.

[0032] The third glue coating line 23 is disposed between the first glue coating lines 21 in the two groups of track units.

[0033] It can be seen that according to the above structure, the gluing track of the glue line coated on the outer surface of the battery 1 can form a continuous gluing track. The newly designed gluing track can meet the glue pressing area under the theoretical glue weight, and will not produce glue overflow, reduce the production scraping process, and speed up production efficiency; at the same time, under the same glue weight, the track pressing area is better than the "S-shaped, Z-shaped, N-shaped" gluing track, which makes up for the risk of cavities appearing in the concave surface of the battery 1, reduces the effect of the stress generated by the glue between the cavities on the performance of the battery 1, and increases the structural strength of the battery 1. In summary, through the optimization of the gluing track, a gluing track with strong practicality and wide application range is designed, which has a better pressing effect under less glue than other tracks, ensuring the structural strength of the battery 1 and reducing production costs.

[0034] For the specific shape of the glue track, please refer to Figure 1 and Figure 2In the specific structure, in an optional embodiment, m=2, n=1, that is, the track unit includes two first glue coating lines 21 in straight track and one second glue coating line 22 in straight track, one of which is in the shape of "N" as a whole, and the other is in the shape of "И". In this specific structure, the shape of the glue coating track is specifically "Ν ˉ И” type, the gluing track has a wide range of applicability and can meet the gluing track of most square batteries 1. In addition, the overall gluing track is relatively short, which shortens the overall gluing track time, reduces the time the glue is exposed to the air, and enhances the adhesive strength of the glue.

[0035] In other embodiments, the specific shape of the gluing track can be that the two track units as a whole can both be an "N"-shaped track; or, the two track units as a whole can both be an "И"-shaped track. Such a structure can also be widely applicable and can meet the gluing track of most square batteries 1.

[0036] In other embodiments, the number of m and n may also be m=3, n=2, that is, the track unit includes three first glue lines 21 in straight track and two second glue lines 22 in straight track, each second glue line 22 is connected between the upper end of one of the two adjacent first glue lines 21 and the lower end of the other, and the specific reference is as follows: Figure 5 .

[0037] Optionally, for the specific position of the third glue coating line 23, please refer to Figure 1 and Figure 2 In the specific structure, the third glue coating line 23 is connected between the upper ends of the first glue coating lines 21 respectively and adjacently arranged in the two groups of track units. In this specific mechanism, "Ν ˉ The "И"-shaped continuous gluing track can shorten the overall gluing track time to a greater extent, reduce the time the glue is exposed to the air, and enhance the adhesive strength of the glue.

[0038] In other embodiments, the specific position of the third glue coating line 23 can also be that the third glue coating line 23 is connected between the lower ends of the first glue coating lines 21 respectively and adjacently arranged in the two groups of track units. Such a structure can form a "Ν_И"-shaped continuous glue coating track, which can shorten the overall glue coating track time compared to the existing glue coating track, reduce the time that the glue is exposed to the air, and enhance the adhesive strength of the glue.

[0039] Optionally, for the shape of the third glue coating line 23, please refer to Figure 1 and Figure 2In the specific structure, the third glue coating line 23 is an arc track. The arc of the arc track of the third glue coating line 23 can be curved upward, that is, toward the top of the battery 1, such as Figure 1 Alternatively, the arc of the arc-shaped trajectory of the third glue coating line 23 may be curved downward, that is, toward the bottom of the battery 1, such as Figure 2 .

[0040] Moreover, the third glue coating line 23 can increase the number of coating tracks according to specific circumstances, for example, it can be coated three times, five times, seven times, etc., to meet actual coating requirements.

[0041] Optionally, in the length direction of the battery 1, the distance d1 between the outermost first glue coating line 21 in the track unit and the side edge of the adjacent battery 1 is in the range of 25mm≤d1≤35mm. Such a structure can further ensure that the pressing area meets the actual requirements.

[0042] In a specific structure, the distance d1 between the outermost first glue line 21 in the track unit and the side edge of the adjacent battery 1 can be 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, etc. Among them, d1 is preferably 30mm. In some other embodiments, the distance d1 between the outermost first glue line 21 in the track unit and the side edge of the adjacent battery 1 can also be other values ​​within the range of 25mm≤d1≤35mm.

[0043] Optionally, in the length direction of the battery 1, in any group of track units, the interval d2 between two first glue coating lines 21 is in the range of 45 mm ≤ d2 ≤ 55 mm. Such a structure can further ensure that the pressing area meets the actual requirements.

[0044] In a specific structure, the distance d2 between the two first glue lines 21 can be 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, etc. Among them, d2 is preferably 50mm. In some other embodiments, the distance d2 between the two first glue lines 21 can also be other values ​​within the range of 45mm≤d2≤55mm.

[0045] Optionally, in the height direction of the battery 1, the first glue line 21 is extended along the height direction of the battery 1; assuming that the height of the battery 1 is h1, the distance between the upper end of the first glue line 21 and the top of the battery 1 is h2=0.1h1, the distance between the lower end of the first glue line 21 and the bottom of the battery 1 is h3=0.2h1, and the height of the first glue line 21 itself is h4=0.7h1. Such a structure can further ensure that the pressing area meets the actual requirements.

[0046] Since the sizes of different types of square batteries 1 are different, the third glue coating line 23 can be specifically set according to the different types of square batteries 1. For example, the spacing between the first glue coating lines 21 respectively and adjacently arranged in the two track units can be set to d3; when d3 < 50mm, a third glue coating line 23 with an arc track can be specifically set; when a ≥ 50mm, the track of the third glue coating line 23 can be specifically improved, for example, it can be improved as follows Figure 3 In the structure, the third glue coating line 23 includes two third glue coating line segments 1 231 in arc-shaped tracks and one third glue coating line segment 2 232 in a straight track and arranged between the two third glue coating line segments 1 231; one of the third glue coating line segments 232 is connected to the upper end of one of the first glue coating lines 21 respectively and adjacently arranged in the two track units, and the other third glue coating line segment 232 is connected to the lower end of the other first glue coating line 21 respectively and adjacently arranged in the two groups of track units. With such a structure, even when facing a long square battery 1, it can ensure that the pressing area meets the actual requirements.

[0047] In actual practical use, the flatness of each batch of battery 1 can be measured, and the amount of glue applied can be appropriately increased at the places where the concave is more obvious. For example, during the gluing process of the first gluing line 21 connected to the third gluing line 23, the gluing speed here can be reduced to increase the amount of glue, and the amount of glue that needs to be increased can be doubled. The main purpose is to fill the gaps between the batteries 1, which can further ensure that the pressed open area meets the actual requirements.

[0048] An embodiment of the utility model further discloses a battery pack, comprising the above-mentioned battery 1, wherein the battery 1 is provided with a plurality of batteries 1 and the plurality of batteries 1 are stacked in a square shape along the thickness thereof, a glue line is provided on the respective large surfaces of two adjacent batteries 1 which are arranged facing each other, and foam 3 for bonding between the batteries 1 is provided on the large surfaces on the same side of the batteries 1.

[0049] In order to further fill the gaps between the batteries 1, glue may also be applied to the four edges of each battery 1. In addition, the glue to be applied may be specifically double the amount of glue applied.

[0050] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A battery, characterized in that: A glue line is applied on the outer side surface of the battery (1), and the glue application track of the glue line includes: At least two groups of track units; in any group of the track units, the track units include m first glue-coated lines (21) in the form of straight tracks and n second glue-coated lines (22) in the form of straight tracks, wherein n=m-1; each of the first glue-coated lines (21) has an upper end and a lower end, and one of the second glue-coated lines (22) is connected between the upper end of one of the adjacent first glue-coated lines (21) and the lower end of another first glue-coated line (21); The third glue coating line (23) is arranged between the first glue coating lines (21) in the two groups of track units.

2. A battery according to claim 1, characterized in that: One of the track units is in the shape of an "N" as a whole, and the other track unit is in the shape of an "И" as a whole.

3. A battery according to claim 1, characterized in that: The third glue coating line (23) is connected between the upper ends of the first glue coating lines (21) respectively and adjacently arranged in the two groups of track units; Alternatively, the third glue coating line (23) is connected between the lower ends of the first glue coating lines (21) respectively and adjacently arranged in the two groups of track units.

4. A battery according to claim 1, characterized in that: The third glue coating line (23) is in the shape of an arc.

5. A battery according to claim 1, characterized in that: The two track units are both "N"-shaped tracks or "И"-shaped tracks as a whole.

6. A battery according to claim 1, characterized in that: The third glue coating line (23) comprises two third glue coating line segments 1 (231) in the form of arc-shaped tracks and one third glue coating line segment 2 (232) in the form of a straight track and arranged between the two third glue coating line segments 1 (231); One of the third glue coating line segments 2 (232) is connected to the upper end of one of the first glue coating lines (21) respectively and adjacently arranged in the two groups of track units, and the other third glue coating line segment 2 (232) is connected to the lower end of another of the first glue coating lines (21) respectively and adjacently arranged in the two groups of track units.

7. A battery according to claim 1, characterized in that: In the length direction of the battery (1), the distance d1 between the outermost first glue coating line (21) in the track unit and the side edge of the adjacent battery (1) is in the range of: 25mm≤d1≤35mm.

8. A battery according to claim 1, characterized in that: In the length direction of the battery (1), in any group of the track units, the interval d2 between two of the first glue coating lines (21) is in the range of 45 mm ≤ d2 ≤ 55 mm.

9. A battery according to claim 1, characterized in that: In the height direction of the battery (1), the first glue coating line (21) is extended along the height direction of the battery (1); assuming that the height of the battery (1) is h1, the distance between the upper end of the first glue coating line (21) and the top of the battery (1) is h2=0.1h1, the distance between the lower end of the first glue coating line (21) and the bottom of the battery (1) is h3=0.2h1, and the height of the first glue coating line (21) itself is h4=0.7h1.

10. A battery pack, characterized in that: A battery according to any one of claims 1 to 9, wherein the glue line is arranged on the respective large surfaces of two adjacent batteries (1) arranged facing each other, and foam (3) for bonding between batteries (1) is arranged on the large surfaces on the same side of the batteries (1).

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