Battery and battery pack

Abstract

The utility model relates to the technical field of battery packs, particularly provides a battery and a battery pack, and aims to solve the problem that the battery pack is easy to damage due to poor shearing strength between the conventional battery pack and a single battery in the battery pack. In order to achieve the purpose, the battery comprises a shell, an insulating film arranged on the outer surface of the shell and an adhesive layer arranged on the outer surface of the insulating film, the insulating film is provided with a through hole, and part of the adhesive layer is contained in the through hole. The through hole is formed in the insulating film, so that the adhesive layer is directly bonded with the shell through the through hole, the connection strength between the shell and the battery pack is improved, the overall shear strength of the battery pack is improved, and the overall strength of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and specifically provides a battery and a battery pack. Background Art

[0002] As the main component inside the battery pack, the battery is usually covered with an insulating film on the outer surface of the shell to prevent the battery from directly contacting the battery pack shell or cover and causing short circuit and damage.

[0003] The battery pack cover is covered on the battery pack shell, and together with the battery pack shell, forms a cavity that can accommodate the battery. A glue layer is usually provided at the connection between the battery pack cover and the insulating film to fix the battery and improve the impact strength of the battery pack. However, the shear strength between the glue layer and the insulating film and between the insulating film and the outer surface of the battery in this structure often cannot meet the requirements of the battery pack impact working condition, resulting in easy damage to the battery pack.

[0004] Therefore, this field needs a new technical solution to solve the above problems. Utility Model Content

[0005] The utility model aims to solve the above technical problem, that is, to solve the problem that the shear strength in the existing battery pack is poor and thus the battery pack is damaged.

[0006] In a first aspect, the utility model provides a battery, comprising a shell, an insulating film arranged on the outer surface of the shell, and a glue layer arranged on the outer surface of the insulating film, wherein the insulating film is provided with a through hole, and part of the glue layer is accommodated in the through hole.

[0007] In a preferred technical solution of the above battery, the adhesive layer in the through hole is bonded to the outer surface of the shell.

[0008] In a preferred technical solution of the above battery, the total area of ​​the through holes is S1, and the total area of ​​the insulating film is S2, wherein 0.05≤S1 / S2<1.

[0009] In the preferred technical solution of the above battery, 0.05≤S1 / S2<0.3.

[0010] In a preferred technical solution of the above battery, the through hole is in a circular, rectangular, elliptical or triangular shape.

[0011] In a preferred technical solution of the above battery, a plurality of through holes are provided and are spaced apart along the first direction.

[0012] In a preferred technical solution of the above battery, a plurality of through holes are provided, and in a first direction, the plurality of through holes are symmetrically arranged about a center line of the insulating film.

[0013] In a preferred technical solution of the above battery, the housing includes a first shell, a partition and a second shell arranged in a second direction, and the insulating film covers the outer surfaces of the first shell and the second shell.

[0014] In a preferred technical solution of the above battery, the first shell is provided with a first connecting portion, and the insulating film covers the first connecting portion; and / or

[0015] The second shell is provided with a second connecting portion, and the insulating film covers the second connecting portion.

[0016] Those skilled in the art can understand that the battery of the utility model includes a shell, an insulating film coated on the outer surface of the shell, and a glue layer arranged on the outer surface of the insulating film, and the insulating film is provided with a plurality of through holes, and the glue layer is partially accommodated in the through holes. By providing through holes in the insulating film, the glue layer is directly bonded to the shell through the through holes, thereby improving the connection strength between the battery shell and the battery pack, thereby improving the shear strength of the battery pack as a whole, improving the impact strength of the battery pack, and avoiding damage to the battery pack due to impact failure.

[0017] Furthermore, the adhesive layer contained in the through hole is bonded to the outer shell. The adhesive layer is directly bonded to the outer shell through the through hole, thereby improving the connection strength between the outer shell and the battery pack, thereby improving the shear strength of the battery pack as a whole and improving the impact strength of the battery pack.

[0018] Furthermore, 0.05≤S1 / S2<0.3; if the total area of ​​the through holes occupies too small an area of ​​the insulating film, the shear strength of the battery pack cannot be guaranteed; if the total area of ​​the through holes occupies too large an area of ​​the insulating film, the performance of the battery is affected.

[0019] In a second aspect, the utility model further provides a battery pack, comprising a battery pack cover and the battery in the above-mentioned preferred technical solution; the battery pack cover is fixedly connected to the adhesive layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0021] Figure 1 It is an exploded diagram of the battery of the utility model;

[0022] Figure 2 It is a structural diagram of a battery of the utility model;

[0023] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0024] Figure 4 It is a structural diagram of the insulating film of the utility model;

[0025] Figure 5 It is a schematic diagram of the expansion of the insulating film of the utility model.

[0026] Reference numerals:

[0027] 1. Shell; 11. First shell; 111. First connection portion; 112. First accommodating cavity; 113. First opening; 12. Partition plate; 13. Second shell; 131. Second connection portion;

[0028] 2. Insulating film; 21. Through hole;

[0029] 3. Battery cell. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. For example, although the battery of the present invention is described in the specification as a blade battery, the technical solution of the present invention is not limited to this. Those skilled in the art can apply the technical solution in the present invention to other types of battery structures as needed, and such changes to the application object do not deviate from the principle and scope of the present invention.

[0031] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", "front", "back" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "connection", "setting" and "installation" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Based on the problem pointed out in the background technology that the shear strength in the battery pack often cannot meet the requirements of the battery pack impact working condition and cause the battery pack to be damaged, the utility model discloses a battery, the battery includes a shell, an insulating film coated on the outer surface of the shell, and a glue layer arranged on the outer surface of the insulating film, and the insulating film is provided with a plurality of through holes, and the glue layer is partially accommodated in the through holes. Through holes are provided on the insulating film, so that the glue layer is directly bonded to the shell through the through holes, and the connection strength between the shell and the battery pack is improved, so that the overall shear strength of the battery pack is improved, and the impact strength of the battery pack is improved, and damage to the battery pack due to impact failure is avoided.

[0034] See first Figures 1 to 3 , the battery of the utility model is described. Among them, Figure 1 It is an exploded diagram of the battery of the utility model; Figure 2 It is a structural diagram of a battery of the utility model; Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0035] like Figure 1 and Figure 2 As shown, the battery of the utility model includes a shell 1, an insulating film 2 coated on the outer surface of the shell 1, and a glue layer (not shown in the figure) arranged on the outer surface of the insulating film 2. The insulating film 2 is provided with a plurality of through holes 21, and the glue layer is partially accommodated in the through holes 21.

[0036] It should be noted that the material of the housing 1 is not fixed in the present application, and those skilled in the art can flexibly adjust it according to the actual product situation. For example, the housing 1 is made of metal, wherein the metal material includes but is not limited to aluminum and steel.

[0037] In addition, it should be noted that the present invention does not limit the material of the insulating film 2, and those skilled in the art can flexibly adjust it according to actual product needs. For example, the insulating film 2 is made of polypropylene; or, for another example, the insulating film 2 is made of polyester.

[0038] It is worth mentioning that the battery in the present invention is along its second direction (i.e., the thickness direction of the battery, such as Figure 2 After stacking, the battery pack components such as the battery pack cover and the battery pack shell are integrated into a battery pack.

[0039] Preferably, the adhesive layer contained in the through hole 21 is bonded to the outer shell 1. The adhesive layer is directly bonded to the outer shell 1 through the through hole 21, thereby improving the connection strength between the outer shell 1 and the battery pack, thereby improving the shear strength of the battery pack as a whole and improving the impact strength of the battery pack.

[0040] It is understandable that those skilled in the art can flexibly select the material of the adhesive layer according to actual product conditions; for example, the adhesive layer is polyurethane structural adhesive.

[0041] Continue reading Figures 1 to 3 , and combined with Figure 4 , Figure 5 , further describing the battery and insulating film of the utility model. Among them, Figure 4 It is a structural diagram of the insulating film of the utility model. Figure 5 It is a schematic diagram of the expansion of the insulating film of the utility model.

[0042] like Figures 1 to 3 As shown, the housing 1 includes a Figure 2 The first shell 11, the partition 12 and the second shell 13 are arranged in the front-to-back direction shown in the figure, and the thickness direction of the shell 1, and the insulating film 2 is coated on the outer surfaces of the first shell 11 and the second shell 13.

[0043] Specifically, Figure 1 and Figure 2 As shown, the first shell 11 has a first accommodating cavity 112, and a first opening 113 communicating with the first accommodating cavity 112 is opened on it; the second shell 13 has a second accommodating cavity (not shown in the figure), and a second opening communicating with the second accommodating cavity is opened on it (not shown in the figure); the first opening 113 and the second opening are arranged opposite to each other, and the partition 12 is arranged between the first shell 11 and the second shell 13, so that the first accommodating cavity 112 and the second accommodating cavity can respectively form two independent closed chambers with the partition 12 for accommodating the battery cell 3.

[0044] It should be noted that the material of the partition 12 is not fixed in the present application, and those skilled in the art can flexibly adjust it according to the actual product conditions. For example, the material of the partition 12 is stainless steel.

[0045] In a preferred embodiment, Figure 1 and Figure 2 As shown, a first connecting portion 111 is provided on the first shell 11, and the first connecting portion 111 is arranged circumferentially along the first opening 113 and extends in a direction away from the first accommodating cavity 112; a second connecting portion 131 is provided on the second shell 13, and the second connecting portion 131 is arranged circumferentially along the second opening and extends in a direction away from the second accommodating cavity; when the first shell 11 and the second shell 13 are matched, the first connecting portion 111 is connected to the second connecting portion 131 at one side; the insulating film 2 covers the first connecting portion 111 and the second connecting portion 131.

[0046] Alternatively, in an alternative embodiment, a first connecting portion 111 is provided on the first shell 11 , the first connecting portion 111 is circumferentially arranged along the first opening 113 and extends in a direction away from the first accommodating cavity 112 , and the insulating film 2 covers the first connecting portion 111 .

[0047] Alternatively, in another alternative embodiment, a second connecting portion 131 is provided on the second shell 13 , the second connecting portion 131 is circumferentially arranged along the second opening and extends in a direction away from the second accommodating cavity, and the insulating film 2 covers the second connecting portion 131 .

[0048] See also Figure 4 and Figure 5 There are multiple through holes 21, the total area of ​​the multiple through holes 21 is S1, and the area of ​​the insulating film 2 is S2 (including the total area S1 of the through holes 21), wherein 0.05≤S1 / S2<1.

[0049] Furthermore, 0.05≤S1 / S2<0.3. If the total area of ​​the through holes 21 occupies too small an area of ​​the insulating film 2, the shear strength of the battery pack cannot be guaranteed; if the total area of ​​the through holes 21 occupies too large an area of ​​the insulating film 2, the performance of the battery is affected.

[0050] In a specific implementation, the value of S1 / S2 is 0.076.

[0051] It is understandable that, under the premise of ensuring the shear strength and battery performance of the battery pack, the area of ​​the through hole 21 in the present application is not fixed, and technical personnel in this field can flexibly adjust it according to the actual product situation, as long as the total area of ​​the through hole 21 and the area of ​​the insulating film 2 satisfy 0.05≤S1 / S2<0.3.

[0052] In addition, although Figure 1 The shape of the through hole 21 shown in the figure is circular, but this is only exemplary and not restrictive; the shape of the through hole 21 in the present application is not fixed, and those skilled in the art can flexibly adjust the shape of the through hole 21 according to actual product requirements. For example, the shape of the through hole 21 is set to be rectangular, elliptical or triangular.

[0053] Preferably, there are multiple through holes 21, and the multiple through holes 21 are arranged along the first direction (eg Figure 4 The left and right directions of the battery pack and the length direction of the housing 1 are arranged at intervals. Through such an arrangement, when the battery pack is impacted, the force between the battery pack and the batteries is relatively uniform, which improves the shear strength of the battery pack to a certain extent.

[0054] Preferably, a plurality of through holes 21 are provided, and in the first direction, the plurality of through holes 21 are symmetrically arranged about the center line of the insulating film.

[0055] Alternatively, in a possible implementation, the number of through holes 21 is 1, and the through hole 21 extends along the first direction of the insulating film 2. Obviously, the number of through holes 21 provided in the present application is not fixed, and those skilled in the art can flexibly adjust it according to actual product conditions. For example, 1, 2, 5 or other numbers of through holes 21 are provided along the first direction of the insulating film 2.

[0056] In a specific implementation manner, Figure 2 and Figure 4 As shown, when the insulating film 2 is coated on the housing 1, the through hole 21 is located in the third direction of the housing 1 (such as Figure 2 In the up-down direction, on both sides of the width direction of the housing 1).

[0057] Specifically, Figure 5 As shown, the through holes 212 are opened at the edges of both sides of the insulating film 2 and at the middle position of the insulating film 2. When the shell 1 is covered, the setting direction of the plurality of through holes 21 is consistent with the first direction of the shell 1, so that the through holes 21 at the middle position of the insulating film 2 are covered on one side of the shell 1 in the third direction (such as Figure 2 The through holes 21 at the edges of both sides of the insulating film 2 are covered on the other side of the third direction of the housing 1 (such as Figure 2 ). Further, both sides of the second direction of the housing 1 are coated with an insulating film 2 to insulate the battery, effectively preventing the battery from conducting electricity and extending the service life of the battery pack. Further, both sides of the first direction of the housing 1 are not coated with an insulating film to set poles, thereby facilitating electrical connection of multiple batteries through the poles to ensure normal operation of the battery pack.

[0058] Alternatively, the through holes 21 are provided at the edges of both sides of the insulating film 2; in this case, when the insulating film 2 is covered on the housing 1, the through holes 21 are only provided on one side of the housing 1 in the third direction (such as Figure 4 upper or lower side shown).

[0059] Alternatively, the through hole 21 is opened in the middle of the insulating film 2; in this case, when the insulating film 2 is covered on the housing 1, the through hole 21 is only arranged on one side of the housing 1 in the third direction (such as Figure 4 upper or lower side shown).

[0060] It is understandable that those skilled in the art can flexibly adjust the opening position of the through hole 21 according to actual product conditions, as long as the shear strength between the battery and the battery pack can be increased.

[0061] It should be noted that the battery in the present application can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., and the embodiments of the present application are not limited to this.

[0062] On the other hand, the utility model also discloses a battery pack, which includes a battery pack cover (not shown in the figure) and a battery as described in any of the aforementioned schemes, and has all the above technical effects, which will not be repeated here.

[0063] Preferably, the battery pack cover is fixedly connected to the adhesive layer, which increases the shear strength between the battery and the battery pack cover, improves the impact strength of the battery pack, avoids impact failure of the battery pack, and improves the safety of the battery pack.

[0064] It should be noted that the material of the battery pack cover is not fixed in this application, and those skilled in the art can flexibly adjust it according to the actual product situation. For example, the battery pack cover is made of metal, wherein the metal material includes but is not limited to aluminum and steel.

[0065] It is worth noting that the battery pack also includes a battery pack shell (not shown in the figure), and the battery pack shell and the battery pack cover together form a cavity that can accommodate the battery, and the battery pack cover is covered on the battery pack shell. When the battery is integrated into a battery pack, the two side surfaces of the battery in the third direction are respectively connected to the battery pack cover and the bottom surface of the battery pack shell, and the through hole 21 can face the bottom surface of the battery pack cover and the battery pack shell, and the shell 1 is respectively connected to the battery pack cover and the battery pack shell through the adhesive layer received in the through hole 21, thereby improving the impact strength of the battery pack.

[0066] It should be noted that the above preferred implementations are only used to illustrate the principle of the utility model and are not intended to limit the protection scope of the utility model. Without departing from the principle of the utility model, those skilled in the art may adjust the above settings so that the utility model can be applied to more specific application scenarios.

[0067] Of course, the above-mentioned replaceable implementations, as well as the replaceable implementations and the preferred implementations, can be used in a cross-coordinated manner to combine new implementations to suit more specific application scenarios.

[0068] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A battery, characterized in that: The battery comprises a shell, an insulating film arranged on the outer surface of the shell, and a glue layer arranged on the outer surface of the insulating film. The insulating film is provided with a through hole, and part of the glue layer is accommodated in the through hole. There are a plurality of through holes and they are arranged at intervals along the first direction.

2. The battery according to claim 1, characterized in that The adhesive layer in the through hole is bonded to the outer surface of the shell.

3. The battery according to claim 2, characterized in that The total area of ​​the through holes is S1, and the total area of ​​the insulating film is S2, wherein 0.05≤S1 / S2<1.

4. The battery according to claim 3, characterized in that in, 0.05≤S1 / S2<0.

3.

5. The battery according to claim 1, characterized in that The through hole is in a circular, rectangular, elliptical or triangular shape.

6. The battery according to claim 1, characterized in that In the first direction, the plurality of through holes are symmetrically arranged about a center line of the insulating film.

7. The battery according to claim 1, characterized in that The housing includes a first shell, a partition, and a second shell arranged in a second direction, and the insulating film covers outer surfaces of the first shell and the second shell.

8. The battery according to claim 7, characterized in that The first shell is provided with a first connecting portion, and the insulating film covers the first connecting portion; and / or The second shell is provided with a second connecting portion, and the insulating film covers the second connecting portion.

9. A battery pack, characterized in that: The battery pack comprises a battery pack cover and the battery according to any one of claims 1 to 8, and the battery pack cover is fixedly connected to the adhesive layer.

Images