Battery cover plate, battery and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cover plate, a battery and a battery pack, and the battery cover plate comprises a cover plate body provided with a first through hole; the upper insulating part is provided with a second through hole which is communicated with the first through hole; the lower insulating part is provided with a third through hole which is communicated with the first through hole; wherein the upper insulating part and the cover plate body are bonded through a first adhesive layer, and the lower insulating part and the cover plate body are bonded through a second adhesive layer. According to the utility model, the upper insulating part, the cover plate body and the lower insulating part are bonded into a whole by utilizing the first adhesive layer and the second adhesive layer, the first through hole, the second through hole and the third through hole which are communicated are used as the tab through holes, and the tabs of the pole group in the shell are led out of the shell through the tab through holes and then are electrically connected with the connecting sheet and / or the pole, so that the reliability of the battery is improved. Therefore, the connection mode of the pole and the tab does not occupy the internal space of the shell, so that the utilization rate of the internal space of the shell can be improved.

Description

Technical Field

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

[0002] The battery mainly consists of a cover plate (which integrates the electrode, explosion-proof valve, upper plastic, lower plastic, injection hole, etc.), a connecting piece, an electrode group, and a shell. After laser welding, the cover plate and shell form a closed space with a certain mechanical strength to protect the electrode group. Within the closed space, the electrode group's tabs are electrically connected to the electrode via the connecting piece. However, the above-mentioned connection method between the electrode and the tab results in excessive occupation of the internal space of the shell, resulting in low internal space utilization. Utility Model Content

[0003] In view of this, the present invention provides a battery cover, a battery and a battery pack to solve the problem of low utilization of the internal space of the shell in the prior art.

[0004] In the first aspect, the utility model provides a battery cover, comprising: a cover body, which is provided with a first through-hole; an upper insulating member, which is arranged on the first side surface of the cover body, and the upper insulating member is provided with a second through-hole, and the second through-hole is connected to the first through-hole; a lower insulating member, which is arranged on the second side surface of the cover body, and the lower insulating member is provided with a third through-hole, and the third through-hole is connected to the first through-hole; wherein, the upper insulating member and the cover body are bonded by a first adhesive layer, and the lower insulating member and the cover body are bonded by a second adhesive layer.

[0005] Beneficial effect: The upper insulating member, the cover plate body and the lower insulating member are bonded together by using the first adhesive layer and the second adhesive layer, and the first perforation, the second perforation and the third perforation are connected as the tab perforations. The tabs of the pole group in the shell are led out to the outside of the shell through the tab perforations, and then electrically connected to the connecting piece and / or the pole. Therefore, the connection method between the pole and the tab will not occupy the internal space of the shell, thereby improving the utilization rate of the internal space of the shell.

[0006] In an optional embodiment, a receiving groove is provided on the first side surface of the cover body, the upper insulating member is arranged corresponding to the receiving groove, and the first adhesive layer is arranged between a side of the upper insulating member facing the cover body and the bottom wall of the receiving groove.

[0007] Beneficial effect: By providing the accommodating groove, the installation and positioning of the upper insulating member are facilitated, and the upper insulating member is prevented from protruding too much from the cover body, thereby affecting the overall space utilization of the battery. At the same time, the bonding strength between the upper insulating member and the cover body can be ensured.

[0008] In an optional embodiment, the upper insulating member includes a flat plate portion and a boss portion, the flat plate portion is arranged in the accommodating groove, the side of the flat plate portion facing the cover plate body is bonded to the bottom wall of the accommodating groove through the first adhesive layer, and the boss portion is protrudingly arranged on the side of the flat plate portion facing away from the cover plate body.

[0009] In an optional embodiment, along the thickness direction of the battery cover, the thickness of the cover body is H, and the distance between a side of the flat portion facing away from the cover body and the first side surface of the cover body is h, satisfying 0≤h≤0.5H.

[0010] Beneficial effect: While ensuring the overall space utilization of the battery, it avoids the accommodating groove being too deep to affect the structural strength of the cover body.

[0011] In an optional embodiment, the second adhesive layer is arranged between a surface of the lower insulating member facing the cover body and a second side surface of the cover body.

[0012] In an optional embodiment, a convex bulge is formed on a side of the lower insulating member facing the cover body around the outer periphery of the third through-hole, and the convex bulge is inserted into the first through-hole and abuts against a side of the upper insulating member facing the cover body; or,

[0013] A convex bump is formed on a side of the upper insulating member facing the cover body around the outer periphery of the second through hole, the convex bump is inserted into the first through hole and abuts against a side of the lower insulating member facing the cover body; or,

[0014] A bulge is formed on one side of the lower insulating member facing the cover body around the outer periphery of the third through-hole, and a bulge is formed on one side of the upper insulating member facing the cover body around the outer periphery of the second through-hole. The bulge of the lower insulating member and the bulge of the upper insulating member are both inserted into the first through-hole and abut against each other.

[0015] Beneficial effect: The convex bump formed by the lower insulating member and / or the upper insulating member is inserted into the first through-hole, thereby ensuring the insulation of the cover plate body at the first through-hole.

[0016] In an optional embodiment, one first perforation is provided, one second perforation is provided, and one third perforation is provided, and one first perforation, one second perforation, and one third perforation are correspondingly connected; or,

[0017] There are several first perforations spaced apart, several second perforations spaced apart, and several third perforations spaced apart. Several second perforations are connected to several first perforations in a one-to-one correspondence, and several third perforations are connected to several first perforations in a one-to-one correspondence.

[0018] Beneficial effect: The number of the first perforation, the second perforation and the third perforation can be specifically designed according to the number of electrode groups in the shell, thereby improving the adaptability of the battery cover.

[0019] In an optional embodiment, the cover plate body and / or the lower insulating member are flat plate structures.

[0020] Beneficial effect: By setting the cover body and / or the lower insulating member as a flat structure, it is convenient to bond the cover body and the lower insulating member through the second adhesive layer, and the additional occupation of the internal space of the shell can be further reduced.

[0021] In a second aspect, the present invention further provides a battery, comprising the above-mentioned battery cover.

[0022] In a third aspect, the present invention further provides a battery pack comprising the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a schematic structural diagram of a battery cover according to an embodiment of the present invention at one angle;

[0025] Figure 2 for Figure 1 A schematic structural diagram of the battery cover shown in another angle;

[0026] Figure 3 for Figure 1 The exploded structural diagram of the battery cover shown;

[0027] Figure 4 for Figure 2 The exploded structural diagram of the battery cover shown;

[0028] Figure 5 for Figure 1 A top view of the battery cover shown;

[0029] Figure 6 for Figure 5 Partial cross-sectional view along the AA direction.

[0030] Description of reference numerals:

[0031] 1. Cover plate body; 11. First through-hole; 12. Accommodation groove; 2. Upper insulating member; 21. Second through-hole; 22. Flat plate portion; 23. Boss portion; 3. Lower insulating member; 31. Third through-hole; 4. Bump. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0033] The following combination Figures 1 to 6 , describing the embodiments of the present utility model.

[0034] According to an embodiment of the present invention, on the one hand, a battery cover is provided, including: a cover body 1, which is provided with a first through-hole 11; an upper insulating member 2, which is arranged on a first side surface of the cover body 1, and the upper insulating member 2 is provided with a second through-hole 21, and the second through-hole 21 is connected to the first through-hole 11; a lower insulating member 3, which is arranged on a second side surface of the cover body 1, and the lower insulating member 3 is provided with a third through-hole 31, and the third through-hole 31 is connected to the first through-hole 11; wherein, the upper insulating member 2 and the cover body 1 are bonded by a first adhesive layer, and the lower insulating member 3 and the cover body 1 are bonded by a second adhesive layer.

[0035] The battery cover of this embodiment utilizes a first adhesive layer and a second adhesive layer to bond the upper insulating member 2, the cover body 1, and the lower insulating member 3 into one body, and the first through-hole 11, the second through-hole 21, and the third through-hole 31 that are connected are used as tab through-holes. The tabs of the pole group in the shell are led out to the outside of the shell through the tab through-holes, and then electrically connected to the connecting piece and / or the pole. Therefore, the connection method between the pole and the tab will not occupy the internal space of the shell, thereby improving the utilization rate of the internal space of the shell.

[0036] It is worth noting that both the first and second adhesive layers are resistant to electrolytes and meet the requirement that the bonding strength between the upper insulating member 2 and the cover body 1, and the bonding strength between the lower insulating member 3 and the cover body 1, are both no less than 0.5 MPa. Furthermore, the first and second adhesive layers can be made of polyolefin resin, polyisobutylene rubber, or the like.

[0037] Please note that Figure 3 The first side of the cover body 1 is the upper side of the cover body 1, and the second side of the cover body 1 is the lower side of the cover body 1. Therefore, it can be understood that the upper insulating member 2 is located above the cover body 1, and the lower insulating member 3 is located below the cover body 1.

[0038] In one embodiment, Figure 1 As shown, a receiving groove 12 is defined on the first side of the cover body 1. The upper insulating member 2 is positioned corresponding to the receiving groove 12. The first adhesive layer is disposed between the surface of the upper insulating member 2 facing the cover body 1 and the bottom wall of the receiving groove 12. The provision of the receiving groove 12 facilitates the installation and positioning of the upper insulating member 2, prevents the upper insulating member 2 from protruding too far from the cover body 1 and affecting the overall space utilization of the battery, and ensures the bonding strength between the upper insulating member 2 and the cover body 1. In other words, if the upper insulating member 2 protrudes too far from the cover body 1, the overall volume of the battery will increase, and the overall space utilization of the battery will decrease.

[0039] It is worth noting that a colloid is coated on one side of the upper insulating member 2 facing the cover body 1 and / or the bottom wall of the receiving groove 12, and then the upper insulating member 2 is connected to the bottom wall of the receiving groove 12 through the colloid, and the colloid between the upper insulating member 2 and the bottom wall of the receiving groove 12 forms a first adhesive layer.

[0040] In one embodiment, Figure 1 and Figure 3 As shown, the upper insulating member 2 includes a flat plate portion 22 and a boss portion 23. The flat plate portion 22 is arranged in the receiving groove 12. The side of the flat plate portion 22 facing the cover body 1 is bonded to the bottom wall of the receiving groove 12 through a first adhesive layer. The boss portion 23 protrudes and is arranged on the side of the flat plate portion 22 facing away from the cover body 1.

[0041] It is worth noting that the first adhesive layer can cover the side of the flat plate portion 22 facing the cover body 1 to improve the bonding strength between the upper insulating member 2 and the cover body 1. Of course, the range of the first adhesive layer can also be specifically set according to actual needs to ensure the bonding strength between the upper insulating member 2 and the cover body 1 while avoiding material waste.

[0042] In one embodiment, Figure 6As shown, along the thickness direction of the battery cover, the cover body 1 has a thickness H, and the distance between the side of the flat portion 22 facing away from the cover body 1 and the first side surface of the cover body 1 is h, satisfying 0≤h≤0.5H. This arrangement ensures overall battery space utilization while preventing the accommodating groove 12 from being too deep, thereby affecting the structural strength of the cover body 1. In other words, the groove area and groove depth of the accommodating groove 12 are sufficient to fully accommodate the flat portion 22. At the same time, the groove area and groove depth of the accommodating groove 12 do not need to be excessively large, otherwise it will easily lead to insufficient structural strength of the cover body 1.

[0043] In one embodiment, the second adhesive layer is disposed between a surface of the lower insulating member 3 facing the cover body 1 and a second side surface of the cover body 1 .

[0044] It is worth noting that the colloid is coated on the side of the lower insulating member 3 facing the cover body 1 and / or the second side surface of the cover body 1, and then the lower insulating member 3 is connected to the cover body 1 through the colloid, and the colloid between the lower insulating member 3 and the cover body 1 forms a second adhesive layer.

[0045] It should be noted that the second adhesive layer can cover the side of the lower insulating member 3 facing the cover body 1 to improve the bonding strength between the lower insulating member 3 and the cover body 1. Of course, the range of the second adhesive layer can also be specifically set according to actual needs to ensure the bonding strength between the lower insulating member 3 and the cover body 1 while avoiding material waste.

[0046] In one embodiment, Figures 1 to 6 As shown, the cover body 1 and the lower insulating member 3 are both flat plate structures. This arrangement facilitates the bonding of the cover body 1 and the lower insulating member 3 via the second adhesive layer and can further reduce the additional space occupied by the inner space of the housing.

[0047] In one embodiment, Figure 3 As shown, a convex bump 4 is formed on the outer periphery of the third through hole 31 on the side of the lower insulating member 3 facing the cover body 1 . The convex bump 4 is inserted into the first through hole 11 and abuts against the side of the upper insulating member 2 facing the cover body 1 .

[0048] Of course, in other alternative embodiments, a bulge 4 may be formed on the side of the upper insulating member 2 facing the cover body 1 around the outer periphery of the second through-hole 21, the bulge 4 may be inserted into the first through-hole 11, and abut against the side of the lower insulating member 3 facing the cover body 1; or, a bulge 4 may be formed on the side of the lower insulating member 3 facing the cover body 1 around the outer periphery of the third through-hole 31 and on the side of the upper insulating member 2 facing the cover body 1 around the outer periphery of the second through-hole 21, and the bulge 4 of the lower insulating member 3 and the bulge 4 of the upper insulating member 2 may be inserted into the first through-hole 11 and abut against each other.

[0049] Therefore, the bulge 4 formed by the lower insulating member 3 and / or the upper insulating member 2 is inserted into the first through-hole 11 to ensure the insulation of the cover body 1 at the first through-hole 11. It can be understood that the tab is inserted into the space enclosed by the bulge 4, so insulation is formed between the tab and the cover body 1 through the bulge 4.

[0050] It is worth noting that the outer peripheral surface of the convex hull 4 can also be bonded to the hole wall of the first through hole 11 through a colloid.

[0051] In one embodiment, Figures 1 to 5 As shown, a plurality of first through-holes 11 are arranged at intervals, a plurality of second through-holes 21 are arranged at intervals, and a plurality of third through-holes 31 are arranged at intervals. A plurality of second through-holes 21 are connected to a plurality of first through-holes 11 in a one-to-one correspondence, and a plurality of third through-holes 31 are connected to a plurality of first through-holes 11 in a one-to-one correspondence. In this way, a plurality of tab through-holes can be formed.

[0052] Of course, in other alternative embodiments, one first through-hole 11 is provided, one second through-hole 21 is provided, and one third through-hole 31 is provided, and one first through-hole 11, one second through-hole 21, and one third through-hole 31 are correspondingly connected. In this way, one tab through-hole can be formed.

[0053] It should be noted that the number of the first through-hole 11 , the second through-hole 21 and the third through-hole 31 can be specifically designed according to the number of electrode groups in the housing to improve the adaptability of the battery cover.

[0054] Specifically, in this embodiment, Figures 1 to 5 As shown, there are two first perforations 11, two second perforations 21 and two third perforations 31, the two first perforations 11 are spaced apart along the width direction of the battery cover, the two second perforations 21 are spaced apart along the width direction of the battery cover, and the two third perforations 31 are spaced apart along the width direction of the battery cover.

[0055] It is worth noting that the numbers of the first through-holes 11, second through-holes 21, and third through-holes 31 mentioned above are for the same polarity, i.e., positive or negative. For example, for the positive electrode, the number of the first through-hole 11, second through-hole 21, and third through-hole 31 can be one or more, respectively; for the negative electrode, the number of the first through-hole 11, second through-hole 21, and third through-hole 31 can be one or more, respectively.

[0056] According to an embodiment of the present invention, on the other hand, a battery is provided, comprising the above-mentioned battery cover.

[0057] In one embodiment, the battery further comprises a housing, the interior of the housing being hollow, at least one end of the housing having an opening, a battery cover being connected to the housing and sealing the opening, and the battery cover and the housing together forming a housing space. Furthermore, the battery further comprises a pole group, which is disposed corresponding to the housing space and includes a tab. The tab extends through a tab perforation formed within the housing space by connecting the first perforation 11, the second perforation 21, and the third perforation 31, and can then be electrically connected to a connecting piece and / or a pole post.

[0058] According to an embodiment of the present invention, in another aspect, a battery pack is provided, comprising the above-mentioned battery.

[0059] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery cover, characterized in that: include: The cover body is provided with a first through hole; an upper insulating member disposed on the first side surface of the cover body, the upper insulating member being provided with a second through-hole, the second through-hole being in communication with the first through-hole; a lower insulating member disposed on the second side surface of the cover body, the lower insulating member being provided with a third through-hole, the third through-hole being in communication with the first through-hole; The upper insulating member and the cover body are bonded together by a first adhesive layer, and the lower insulating member and the cover body are bonded together by a second adhesive layer.

2. The battery cover according to claim 1, characterized in that: A receiving groove is formed on the first side surface of the cover body, the upper insulating member is arranged corresponding to the receiving groove, and the first adhesive layer is arranged between a side of the upper insulating member facing the cover body and a bottom wall of the receiving groove.

3. The battery cover according to claim 2, characterized in that: The upper insulating member includes a flat plate portion and a boss portion. The flat plate portion is arranged in the accommodating groove. The side of the flat plate portion facing the cover plate body is bonded to the bottom wall of the accommodating groove through the first adhesive layer. The boss portion protrudes from the side of the flat plate portion facing away from the cover plate body.

4. The battery cover according to claim 3, characterized in that: Along the thickness direction of the battery cover, the thickness of the cover body is H, and the distance between a side of the flat portion facing away from the cover body and the first side surface of the cover body is h, satisfying 0<h≤0.5H.

5. The battery cover according to any one of claims 1 to 4, characterized in that: The second adhesive layer is arranged between a surface of the lower insulating member facing the cover body and a second side surface of the cover body.

6. The battery cover according to any one of claims 1 to 4, characterized in that: A convex bulge is formed on a side of the lower insulating member facing the cover body around the outer periphery of the third through-hole, the convex bulge is inserted into the first through-hole, and abuts against a side of the upper insulating member facing the cover body; Or, A convex bulge is formed on a side of the upper insulating member facing the cover body around the outer periphery of the second through-hole, the convex bulge is inserted into the first through-hole and abuts against a side of the lower insulating member facing the cover body; Or, A bulge is formed on one side of the lower insulating member facing the cover body around the outer periphery of the third through-hole, and a bulge is formed on one side of the upper insulating member facing the cover body around the outer periphery of the second through-hole. The bulge of the lower insulating member and the bulge of the upper insulating member are both inserted into the first through-hole and abut against each other.

7. The battery cover according to any one of claims 1 to 4, characterized in that: There is one first perforation, one second perforation, and one third perforation, and one first perforation, one second perforation, and one third perforation are connected to each other; or There are several first perforations spaced apart, several second perforations spaced apart, and several third perforations spaced apart. Several second perforations are connected to several first perforations in a one-to-one correspondence, and several third perforations are connected to several first perforations in a one-to-one correspondence.

8. The battery cover according to any one of claims 1 to 4, characterized in that: The cover plate body and / or the lower insulating member are flat plate structures.

9. A battery, characterized in that: A battery cover according to any one of claims 1 to 8.

10. A battery pack, characterized in that: A battery comprising the battery of claim 9.

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