Battery and battery pack

Abstract

The utility model relates to the field of batteries, and discloses a battery and a battery pack. The battery comprises a shell which is of a square structure and is provided with a first end face and a second end face which are opposite to each other, two opposite first side faces and two opposite second side faces; the cover plate is connected to the first end surface and is provided with a pole; the first protection piece at least covers and is connected to the second end face; the second protection part covers the second end face and the two second side faces, on the second end face, the second protection part is arranged on the side, away from the shell, of the first protection part, the second protection part is connected with the two second side faces, and the second protection part and the first protection part are made of different materials. One of the first protection piece and the second protection piece can be arranged to be a protection film with higher bonding strength, the other one is arranged to be a common protection film, then the one with the higher bonding strength is connected with a box body of the battery pack, and layering or stripping between the protection pieces and the shell is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to battery and battery package. BACKGROUND

[0002] In the field of battery manufacturing, in order to protect the battery and improve its insulation performance, a protective film is usually coated on the surface of the battery. This protective film is also known as blue film, which is usually bonded with the battery shell (such as aluminum shell).

[0003] When multiple batteries are assembled into a battery package, the protective films between the two adjacent batteries are bonded to each other, or the protective film of the battery is bonded to the bottom plate of the battery package. However, in actual application, due to the adhesion strength between the battery and the bottom plate, which is higher than the adhesion strength between the protective film and the battery shell, the connection position of the protective film and the shell becomes the weak link of the entire system. Under the condition of impact or vibration, delamination or peeling phenomenon easily occurs at this connection position, thereby affecting the overall performance and reliability of the battery package.

[0004] If the adhesion strength between the protective film and the battery shell is improved by enhancing the bonding performance of the entire protective film, the production cost of the protective film will be significantly increased. SUMMARY

[0005] Therefore, the utility model provides a battery and a battery package to solve or improve the problem that the production cost of the protective film is significantly increased by enhancing the bonding performance of the entire protective film to improve the adhesion strength between the protective film and the battery shell in the related art.

[0006] In a first aspect, the utility model provides a battery, comprising:

[0007] The shell is in a square structure, and has opposite first and second end faces, two opposite first sides, and two opposite second sides. The first and second sides are arranged between the first and second end faces.

[0008] The cover plate is connected to the first end face and is provided with a pole.

[0009] The first protective member covers and is connected to at least the second end face.

[0010] The second protective member covers the second end face and the two second sides. On the second end face, the second protective member is arranged on the side of the first protective member away from the shell. The second protective member is connected to the two second sides, and the material of the second protective member is different from that of the first protective member.

[0011] In an alternative embodiment, the first protective member further covers the two first side surfaces.

[0012] In an alternative embodiment, the second protective member is provided with an opening at a position opposite to the first protective member.

[0013] In an alternative embodiment, the first protective member has a bonding strength greater than that of the second protective member, and / or a shearing strength greater than that of the second protective member.

[0014] In an alternative embodiment, the first protective member is provided with a first flange on the first side surface, near the edge of the cover plate, the first flange being connected to the surface of the cover plate facing away from the shell.

[0015] In an alternative embodiment, the second protective member is provided with a second flange on the second side surface, near the edge of the cover plate, the second flange being connected to the surface of the cover plate facing away from the shell.

[0016] In an alternative embodiment, the second protective member is provided with a third flange on the second side surface, near both edges of the first side surface, the third flange being connected to the surface of the first protective member facing away from the shell.

[0017] In an alternative embodiment, the first protective member is provided with a textured structure at least on the surface facing the shell.

[0018] In an alternative embodiment, the first protective member is a UV film, and / or the second protective member is a PET film.

[0019] In an alternative embodiment, the battery further comprises a third protective member connected to the surface of the cover plate facing away from the shell, the third protective member being provided with a first avoiding hole at a position opposite to the pole.

[0020] In a second aspect, the utility model further provides a battery pack, comprising:

[0021] a box body;

[0022] a battery as described above, the number of batteries being multiple, and the batteries being arranged in the box body;

[0023] the first protective member covering and being connected to the second end surface and the two first side surfaces;

[0024] The two adjacent batteries are bonded by the two opposite first protection pieces on the first side, and / or the battery adjacent to the side wall of the box is bonded by the first protection piece on the first side opposite to the side wall of the box and the side wall of the box, and / or the first protection piece on the second end face of the battery is bonded to the box through the opening on the second protection piece.

[0025] The battery provided by the utility model, through the first protection piece covering the second end face and the second protection piece covering the second end face and the two second sides, and the material of the first protection piece and the second protection piece being different, one of the first protection piece and the second protection piece is set as the protection film with higher bonding strength, the other is set as the common protection film, and the one with higher bonding strength is connected with the box of the battery pack, so that the delamination or peeling between the protection piece and the shell is avoided.

[0026] Meanwhile, since all the protection pieces of the battery are not set as the protection film with higher bonding strength, the use amount of the protection film with higher bonding strength can be reduced, so that the cost of the battery is reduced.

[0027] The battery pack provided by the utility model contains the battery provided by the utility model, so it contains all the advantages of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0029] Figure 1 The structure schematic view of the battery without the protection piece provided by the utility model embodiment is shown in the figure.

[0030] Figure 2 The process schematic view of covering the first protection piece on the outside of the battery provided by the utility model embodiment is shown in the figure.

[0031] Figure 3 The process schematic view of covering the second protection piece on the outside of the battery provided by the utility model embodiment is shown in the figure.

[0032] Figure 4 The structure schematic view of covering the second protection piece and the first protection piece on the battery provided by the utility model embodiment after the process is completed is shown in the figure.

[0033] Figure 5 The structure schematic view of the battery without the protection piece provided by the utility model embodiment is shown in the figure. Figure 4Structural schematic view of the third protective member covering the basis of the shown view.

[0034] Legend of reference signs:

[0035] 1, housing; 101, first end face; 102, second end face; 103, first side face; 104, second side face; 2, cover plate; 3, pole column; 4, first protective member; 401, first flange; 5, second protective member; 501, opening; 502, second flange; 503, third flange; 6, third protective member. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0037] In the related art, when multiple batteries are assembled into a battery pack, the protective films between two adjacent batteries are bonded to each other, or the protective film of the battery is bonded to the bottom plate of the battery pack. However, in actual application, due to the adhesion strength between the battery and the bottom plate being higher than the adhesion strength between the protective film and the battery shell, the connection position of the protective film and the shell becomes a weak link of the entire system. In the case of impact or vibration, delamination or peeling phenomenon easily occurs at the connection position, thereby affecting the overall performance and reliability of the battery pack.

[0038] If the adhesion strength between the protective film and the battery shell is improved by enhancing the bonding performance of the entire protective film, the production cost of the protective film is significantly increased.

[0039] In order to solve or improve the problem that the adhesion strength between the protective film and the battery shell is improved by enhancing the bonding performance of the entire protective film in the related art, resulting in a significant increase in the production cost of the protective film, the utility model provides a battery and a battery pack.

[0040] The embodiments of the utility model will be described below in combination with Figures 1 to 5 The battery provided in the embodiments of the utility model.

[0041] Specifically, the battery comprises a housing 1, a cover plate 2, a first protective member 4 and a second protective member 5.

[0042] The housing 1 is used to accommodate positive and negative electrodes, a diaphragm, and electrolyte and other materials. The housing 1 is provided in a square structure, and the housing 1 has a first end face 101, a second end face 102, a first side face 103 and a second side face 104.

[0043] The first end surface 101 and the second end surface 102 are oppositely arranged, for example, the first end surface 101 is arranged as the top surface of the shell 1, and the second end surface 102 is arranged as the bottom surface of the shell 1. The first end surface 101 is provided with an opening 501 for mounting positive and negative electrodes and diaphragm and other materials.

[0044] The number of the first side surface 103 is two, and the two first side surfaces 103 are oppositely arranged. The number of the second side surface 104 is two, and the two second side surfaces 104 are oppositely arranged. The first side surface 103 and the second side surface 104 are both arranged between the first end surface 101 and the second end surface 102. For example, Figure 1 It is shown that the area of the first side surface 103 is smaller than the area of the second side surface 104. Of course, the area of the first side surface 103 can also be larger than the area of the second side surface 104, which is not limited.

[0045] The cover plate 2 is connected to the first end surface 101 of the shell 1, and the cover plate 2 is used to close the opening 501 on the first end surface 101 of the shell 1. The cover plate 2 includes but is not limited to welding connection, adhesive connection or screw connection with the shell 1. The cover plate 2 is provided with a pole 3, specifically, the number of the pole 3 is two, which are positive and negative poles respectively.

[0046] The first protective piece 4 at least covers and is connected to the second end surface 102. Optionally, the first protective piece 4 is arranged as a protective film.

[0047] The second protective piece 5 covers the second end surface 102 and the two second side surfaces 104, and on the second end surface 102, the second protective piece 5 is arranged on the side away from the shell 1 of the first protective piece 4. For example, on the second end surface 102, the second protective piece 5 is adhesively connected with the first protective piece 4. The second protective piece 5 is also connected with the two second side surfaces 104, for example, the second protective piece 5 is adhesively connected with the two second side surfaces 104.

[0048] Among them, the second protective piece 5 and the first protective piece 4 are different in material. Optionally, one of the first protective piece 4 and the second protective piece 5 is a protective film with better adhesive strength, and the other is a common protective film.

[0049] For example, the first protective piece 4 is a protective film with better adhesive strength, and the second protective piece 5 is a common protective film. That is, the adhesive strength of the first protective piece 4 is greater than that of the second protective piece 5, and / or the shear strength of the first protective piece 4 is greater than that of the second protective piece 5. Therefore, the first protective piece 4 performs better in adhesion and shear resistance, and can provide stronger adhesion and better mechanical stability. Of course, the opposite is also possible.

[0050] In addition, the first protective piece 4 and the second protective piece 5 are made of different materials, that is, one of the first protective piece 4 and the second protective piece 5 is made of a protective film with higher adhesive strength, and the other is made of a common protective film, and the one with higher adhesive strength is connected to the box of the battery pack, so as to avoid delamination or peeling between the protective piece and the shell 1.

[0051] Meanwhile, since all the protective pieces of the battery do not need to be made of the protective film with higher adhesive strength, the use amount of the protective film with higher adhesive strength can be reduced, thereby reducing the cost of the battery.

[0052] In some embodiments provided by the utility model, the first protective piece 4 also covers and connects to the two first sides 103. Optionally, the first protective piece 4 comprises three parts connected in sequence, and the three parts are respectively attached to and connected with the second end surface 102 and the two first sides 103. For example, the first protective piece 4 is connected with the second end surface 102 and the two first sides 103 by adhesion.

[0053] In the embodiment, the first protective piece 4 covers the second end surface 102 and the two first sides 103, and the second protective piece 5 covers the second end surface 102 and the two second sides 104, so that the first protective piece 4 and the second protective piece 5 jointly cover the second end surface 102, the two first sides 103 and the two second sides 104 of the battery, thereby improving the insulation performance of the battery.

[0054] Reference Figure 3 As shown in the drawings, in some embodiments provided by the utility model, the second protective piece 5 is provided with an opening 501 at a position opposite to the first protective piece 4.

[0055] The adhesive strength of the first protective piece 4 is greater than that of the second protective piece 5, and / or the shear strength of the first protective piece 4 is greater than that of the second protective piece 5.

[0056] In the embodiment, the first protective piece 4 can be connected to the bottom plate of the battery pack box through the opening 501 by being provided with the opening 501. That is, the first protective piece 4 with higher adhesive strength or shear strength can be directly connected to the bottom plate of the box through the opening 501, so as to reduce the load transmission path, that is, the load no longer needs to be transmitted through multiple layers of materials or complex structures, thereby reducing the risk of stress concentration.

[0057] And, compared to the way that the second protective piece 5 is first pasted on the shell, and then the first protective piece 4 covers the side of the second protective piece 5 away from the shell, and the first protective piece 4 covers the opening 501, the way that the first protective piece 4 with greater adhesive strength or shear strength is first arranged on the side close to the shell, and then the second protective piece 5 with the opening 501 is pasted on the first protective piece 4 has the following advantages.

[0058] Pasting the second protective piece 5 first and then pasting the first protective piece 4 will cause a part of the first protective piece 4 to be necessarily connected with the second protective piece 5, that is, the area of the connection between the first protective piece 4 and the shell will be reduced, thereby affecting the adhesive strength of the connection between the shell and the first protective piece 4; and the adhesive strength of the part of the connection between the first protective piece 4 and the second protective piece 5 is different from the adhesive strength of the part of the connection between the first protective piece 4 and the shell, thereby also affecting the uniformity of the adhesive strength; and in the utility model, the first protective piece 4 with better viscosity is first pasted, so that the whole first protective piece 4 is connected with the shell, and the adhesive strength is naturally better.

[0059] In addition, through this connection mode, materials with better performance (that is, the first protective piece 4) can be used at key positions, and materials with lower cost or lower performance requirements (that is, the second protective piece 5) can be used at other positions, so that the cost can be reduced without sacrificing the overall performance.

[0060] In addition, a plurality of batteries are usually arranged in the battery pack, and the protective films between the adjacent two batteries are connected with each other by structural glue, and the adhesive strength between the batteries is usually greater than the adhesive strength between the protective films on the side of the battery and the shell. Therefore, when the first protective piece 4 covers the second end surface 102 and the two first side surfaces 103, and the shear strength or the adhesive strength of the first protective piece 4 is higher, the plurality of batteries can be connected through the first protective piece 4 arranged on the first side surface 103. This also helps to avoid delamination or peeling between the protective piece on the side of the battery and the shell 1 when the plurality of batteries in the battery pack are connected.

[0061] In some embodiments of the utility model, the battery further comprises a third protective piece 6. For example, under the condition that the adhesive strength of the first protective piece 4 is greater than the adhesive strength of the second protective piece 5, and / or the shear strength of the first protective piece 4 is greater than the shear strength of the second protective piece 5, the material of the third protective piece 6 can be the same as that of the second protective piece 5.

[0062] The third protective piece 6 is connected to the surface of the cover plate 2 away from the shell 1, and the position of the third protective piece 6 opposite to the pole 3 is provided with a first avoiding hole. Specifically, the third protective piece 6 has two first avoiding holes for avoiding the positive and negative poles, and of course, the third protective piece 6 can also be provided with a second avoiding hole for avoiding the explosion-proof valve on the cover plate 2.

[0063] In the embodiment, the third protective member 6 is connected to the surface of the cover plate 2 away from the shell 1, so that the third protective member 6 can cover the surface of the cover plate 2 and improve the insulation performance of the cover plate 2. The first protective member 4, the second protective member 5 and the third protective member 6 can cover the first end surface 101, the second end surface 102, the two first side surfaces 103 and the two second side surfaces 104 of the battery, so as to cover the entire outer surface of the battery and improve the insulation performance of the battery.

[0064] In some embodiments of the utility model, on the first side surface 103, the first protective member 4 is provided with a first flange 401 close to the edge of the cover plate 2, and the first flange 401 is connected to the surface of the cover plate 2 away from the shell 1. Optionally, on any one of the first side surfaces 103, the first protective member 4 is provided with a first flange 401 close to the edge of the cover plate 2. Optionally, the third protective member 6 is arranged on the side of the first flange 401 away from the cover plate 2.

[0065] In the embodiment, the first flange 401 of the first protective member 4 is connected to the cover plate 2, which can increase the connection area of the first protective member 4 and the battery and improve the connection strength of the first protective member 4 and the battery. After the edge of the third protective member 6 close to the first flange 401 is raised, the first flange 401 can still cover the surface of the cover plate 2 and form insulation protection for the cover plate 2, so as to avoid the problem of insulation failure of the battery.

[0066] In some embodiments of the utility model, the number of the first flanges 401 is two, and the positive pole and the negative pole are close to the two first side surfaces 103. In the direction from one first side surface 103 to another first side surface 103, the size of the first flange 401 close to the positive pole is smaller than the minimum distance between the positive pole and the corresponding first side surface 103. In the direction from one first side surface 103 to another first side surface 103, the size of the first flange 401 close to the negative pole is smaller than the minimum distance between the negative pole and the corresponding second side surface 104.

[0067] In the embodiment, the size of the first flange 401 is smaller than the minimum distance between the pole 3 and the first side surface 103, which can avoid interference of the first flange 401 to the pole 3.

[0068] In some embodiments of the utility model, on the second side surface 104, the second protective member 5 is provided with a second flange 502 close to the edge of the cover plate 2, and the second flange 502 is connected to the surface of the cover plate 2 away from the shell 1. Optionally, on any one of the second side surfaces, the second protective member 5 is provided with a second flange 502 close to the edge of the cover plate 2. Optionally, the third protective member 6 is arranged on the side of the second flange 502 away from the cover plate 2.

[0069] In the embodiment, by connecting the second flange 502 of the second protective piece 5 to the cover plate 2, on one hand, the connecting area of the second protective piece 5 and the battery can be increased, and the connecting strength of the second protective piece 5 and the battery can be improved. On the other hand, after the edge of the third protective piece 6 close to the second flange 502 is raised, the second flange 502 can still cover the surface of the cover plate 2, and insulation protection of the cover plate 2 is formed, so that the problem of insulation failure of the battery is avoided.

[0070] In some embodiments of the utility model, on the second side surface 104, the two edges of the second protective piece 5 close to the first side surface 103 are each provided with a third flange 503, and the third flange 503 is connected to the surface of the first protective piece 4 away from the shell 1.

[0071] In the embodiment, by providing the third flange 503 on the second protective piece 5 and connecting the third flange 503 to the first protective piece 4, the third flange 503 is coincided with the first protective piece 4 on the first side surface 103, and the problem that the first protective piece 4 cannot completely cover the first side surface 103 due to the width of the first protective piece 4 being less than the width of the first side surface 103 is avoided.

[0072] In addition, the width of the first protective piece 4 can be less than the width of the first side surface 103, so as to reduce the use area of the first protective piece 4 and reduce the cost of the battery.

[0073] In some embodiments of the utility model, the first protective piece 4 is provided with a texture structure at least on the surface close to the shell 1. For example, the first protective piece 4 is provided with a convex point structure on the surface close to the shell 1.

[0074] In the embodiment, by providing the texture structure on the surface of the first protective piece 4 close to the shell 1, the surface area of the first protective piece 4 is increased, and the mechanical interlocking between the first protective piece 4 and the shell 1 is increased, so that the bonding strength between the first protective piece 4 and the shell 1 is improved.

[0075] In some embodiments of the utility model, the first protective piece 4 is an ultraviolet curing film (UV film).

[0076] In the embodiment, the UV film can be cured within a few seconds to a few minutes under ultraviolet irradiation, which greatly shortens the production cycle and improves the production efficiency. The UV film can form good bonding with the shell 1, and will not easily peel off after long-term use.

[0077] In some embodiments of the utility model, the second protective piece 5 is a polyethylene terephthalate film (PET film).

[0078] In the embodiment, the PET film has good tensile strength and impact resistance, and can provide reliable protection for the battery.

[0079] The raw material of the PET film is generally resin, which is lower in cost than the raw material, i.e., the prepolymer and the photoinitiator, of the UV film. Meanwhile, the production process of the PET film is relatively simple compared with the production process of the UV film, so the production cost of the PET film is lower than that of the UV film.

[0080] The battery pack also includes the battery as described above.

[0081] Specifically, the battery pack includes a box body and the battery as described above. The number of the batteries is multiple, and the batteries are all arranged in the box body.

[0082] The first protection member 4 of the two adjacent batteries is bonded. Alternatively, at least two groups of batteries are arranged in the box body, the two groups of batteries are arranged side by side, and the first side surface 103 of the two groups of batteries are arranged opposite to each other. The first protection member 4 on the first side surface 103 of the two batteries arranged opposite to each other is bonded to each other. By bonding the batteries, the batteries in the box body form an integrated structure, so that the battery pack can better withstand vibration and impact, thereby improving the overall stability of the battery pack.

[0083] Alternatively, the first protection member 4 of the battery is bonded to the box body through the opening 501 of the second protection member 5. Alternatively, the opening 501 is arranged at the position opposite to the first protection member 4 of the second protection member 5, and the first protection member 4 of the battery is connected to the bottom plate of the box body through the opening 501. By bonding the battery to the box body, the overall structural stability of the battery pack can be enhanced, and the movement of the battery during the operation of the vehicle can be reduced, thereby reducing the risk of damage caused by vibration or impact.

[0084] Alternatively, the battery adjacent to the side wall of the box body is bonded to the side wall of the box body through the first protection member 4 on the first side surface 103 opposite to the side wall. It is known that when the battery is arranged in the battery pack, some of the batteries are necessarily arranged opposite to the side wall of the box body, so the first protection member 4 on the first side surface 103 of these batteries is also bonded to the side wall of the box body.

[0085] In the embodiment, the battery pack contains the battery provided by the utility model, and therefore contains all the advantages of the battery.

[0086] Although the embodiments of the utility model are described in combination with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized by, The battery comprises: a shell (1) provided in a square structure, the shell (1) having opposite first and second end faces (101, 102), two opposite first sides (103) and two opposite second sides (104), the first and second sides (103, 104) being arranged between the first and second end faces (101, 102); a cover plate (2) connected to the first end face (101) and provided with a pole (3); a first protective member (4) covering and connected to at least the second end face (102); a second protective member (5) covering the second end face (102) and the two second sides (104), the second protective member (5) being arranged on the second end face (102) at a side of the first protective member (4) away from the shell (1), the second protective member (5) being connected to the two second sides (104), and the second protective member (5) being made of a material different from that of the first protective member (4).

2. The battery of claim 1, wherein, The first protective member (4) also covers and is connected to the two first sides (103).

3. The battery of claim 1, wherein, An opening (501) is arranged at a position opposite to the first protective member (4) of the second protective member (5). The first protective member (4) has a bonding strength greater than that of the second protective member (5), and / or a shearing strength greater than that of the second protective member (5).

4. The battery of claim 2, wherein, On the first side (103), the first protective member (4) is provided with a first flange (401) near an edge of the cover plate (2), the first flange (401) being connected to a surface of the cover plate (2) away from the shell (1).

5. The battery of claim 1, wherein, On the second side (104), the second protective member (5) is provided with a second flange (502) near an edge of the cover plate (2), the second flange (502) being connected to a surface of the cover plate (2) away from the shell (1).

6. The battery of claim 2, wherein, On the second side (104), the second protective member (5) is provided with two third flanges (503) near edges of the first side (103), the third flanges (503) being connected to a surface of the first protective member (4) away from the shell (1).

7. The battery according to any one of claims 1 to 6, wherein The first protective member (4) is provided with a textured structure at least on a surface thereof near the shell (1).

8. The battery according to any one of claims 1 to 6, wherein The first protective member (4) is provided as a UV film, and / or the second protective member (5) is provided as a PET film.

9. The battery according to any one of claims 1 to 6, wherein The battery further comprises a third protective member (6) connected to a surface of the cover plate (2) away from the shell (1), the third protective member (6) being provided with a first avoiding hole at a position opposite to the pole (3).

10. A battery pack, characterized by, The battery comprises: a box; a plurality of batteries as claimed in any one of claims 1-8, the batteries being arranged in the box; the first protective member covering and connected to the second end face (102) and the two first sides (103); the second protective member covering the second end face (102) and the two second sides (104), the second protective member being arranged on the second end face (102) at a side of the first protective member away from the shell, the second protective member being connected to the two second sides, and the second protective member being made of a material different from that of the first protective member. Among them, the two adjacent said battery through its opposite two located on the first side (103) on the first protection piece (4) bonding, and / or, with the box side wall adjacent to the said battery through the first side (103) on the first protection piece (4) and the box side wall bonding, and / or the said battery on the second end face (102) on the first protection piece (4) through the second protection piece (5) on the opening (501) and the box bonding.

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