Cover plate assembly and battery

Abstract

The utility model provides a cover plate assembly and a battery. The cover plate assembly comprises a cover plate, a pole and a connecting piece, the cover plate is provided with a cover plate hole; one end of the pole penetrates through the cover plate hole, and the other end of the pole is positioned below the cover plate; the connecting piece is located below the cover plate, the connecting piece comprises a first connecting part and a second connecting part extending outwards from the outer periphery of the first connecting part, the side face of the first connecting part is welded to the other end of the pole, and the second connecting part is used for being electrically connected to a roll core. The utility model aims to solve the technical problems that the over-current path is increased and the resistance is increased because the length of the existing connecting sheet is too long.

Description

Technical Field

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

[0002] In the related technology, the cover assembly of the battery mainly includes the lower plastic part, the pole, the top cover and the connecting plate, among which the connecting plate is mainly used to connect the pole and the winding core. During the installation process, the connecting plate is first welded to the winding core, and then the connecting plate is bent, and then the connecting plate is welded to the pole after bending. This will increase the length of the connecting plate, increase the current path, increase the resistance, and affect the performance of the battery. Utility Model Content

[0003] The embodiments of the utility model provide a cover plate assembly and a battery, which are intended to solve the technical problem that the existing connecting piece is too long, resulting in an increase in the overcurrent path and resistance.

[0004] In a first aspect, an embodiment of the present utility model provides a cover plate assembly, comprising:

[0005] A cover plate, provided with a cover plate hole;

[0006] a pole, one end of which passes through the cover plate hole, and the other end of which is located under the cover plate; and

[0007] A connecting piece is located under the cover plate, and includes a first connecting portion and a second connecting portion extending outward from the outer periphery of the first connecting portion, the side of the first connecting portion is welded to the other end of the pole, and the second connecting portion is used to electrically connect to the winding core.

[0008] In one embodiment, the first connecting portion is provided with a connecting hole, the side surface of the first connecting portion includes a hole wall of the connecting hole, and the other end of the pole is located in the connecting hole and welded to the hole wall of the connecting hole.

[0009] In one embodiment, an insulating member is further included, wherein the insulating member includes a first insulating portion and a second insulating portion which are separately arranged, wherein the first insulating portion and the second insulating portion are arranged between the cover plate and the second connecting portion of the connecting piece, and are connected to each other to surround the outer side surface of the first connecting portion.

[0010] In one embodiment, the first insulating portion is detachably connected to the second insulating portion.

[0011] In one embodiment, one of the first insulating portion and the second insulating portion is provided with a clamping hole, and the other one is provided with a clamping portion, and the clamping portion is clamped in the clamping hole.

[0012] In one embodiment, the first insulating portion is provided with a first weight-reducing hole connected to the clamping hole, and the second insulating portion is provided with a second weight-reducing hole adjacent to the clamping portion.

[0013] In one embodiment, an explosion-proof valve is provided on one of the first insulating part and the second insulating part.

[0014] In one embodiment, the end of the pole welded to the first connecting portion is the first end, and the diameter of the first end is D, wherein 6 mm≤D≤20 mm.

[0015] In one embodiment, the height of the first connection portion is H1, and the height of the second connection portion is H2, wherein 0.3 mm ≤ H2 ≤ 1.0 mm, and 2.5 mm ≤ H1 + H2 ≤ 5 mm.

[0016] In a second aspect, an embodiment of the utility model provides a battery, comprising the above-mentioned cover plate assembly, wherein the cover plate assembly comprises:

[0017] A cover plate, provided with a cover plate hole;

[0018] a pole, one end of which passes through the cover plate hole, and the other end of which is located under the cover plate; and

[0019] A connecting piece is located under the cover plate, and includes a first connecting portion and a second connecting portion extending outward from the outer periphery of the first connecting portion, the side of the first connecting portion is welded to the other end of the pole, and the second connecting portion is used to electrically connect to the winding core.

[0020] Beneficial effects of the embodiments of the utility model:

[0021] In the technical solution of the utility model, the first connecting part is welded to the pole, the second connecting part is connected to the winding core, and the first connecting part is connected to the pole by side welding, which not only does not increase the length of the connecting piece, but reduces the size of the connecting piece to a certain extent, thereby shortening the overcurrent path, improving the overcurrent capacity, reducing the resistance, and improving the performance of the battery; at the same time, the structural strength of the connecting piece itself is enhanced, and the first connecting part is welded to the pole, which can also improve the connection strength between the pole and the first connecting part. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a three-dimensional schematic diagram of a cover plate assembly provided in an embodiment of the utility model;

[0024] Figure 2 yes Figure 1 Schematic diagram of the full cross-section structure;

[0025] Figure 3 yes Figure 1 A schematic diagram of the structure of the middle insulating member;

[0026] Figure 4 yes Figure 3 A schematic structural diagram of the first insulating portion;

[0027] Figure 5 yes Figure 3 Schematic diagram of the structure of the second insulating member.

[0028] Figure 6 It is a schematic diagram of the structure of a battery provided in an embodiment of the utility model.

[0029] Description of Figure Numbers

[0030] Label name Label name 100 Cover assembly 113 First extension 101 Cover 114 Second body part 102 Pole 115 The second extension 103 Part 1 116 Card hole 104 Part 2 117 Card connection 105 Connector 118 Card post 106 First connection part 119 Clip-on arm 107 Second connection part 120 The first weight reduction hole 108 Connection hole 121 Second weight reduction hole 109 Insulation 122 Explosion-proof valve 110 The first insulating part 1000 Battery 111 Second insulating part 200 Core 112 First body part DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0032] In the related technology, the cover assembly of the battery mainly includes the lower plastic part, the pole, the top cover and the connecting plate, among which the connecting plate is mainly used to connect the pole and the winding core. During the installation process, the connecting plate is first welded to the winding core, and then the connecting plate is bent, and then the connecting plate is welded to the pole after bending. This will increase the length of the connecting plate, increase the current path, increase the resistance, and affect the performance of the battery.

[0033] In view of this, the utility model proposes a cover plate assembly. Figures 1 to 5This is a structural schematic diagram of an embodiment of a cover plate assembly provided by the utility model. The cover plate assembly provided by the utility model has a simple structure, a short current path, and a small resistance. The cover plate assembly will be described in detail below in conjunction with the main drawings.

[0034] See also Figure 1 and Figure 2 The utility model provides a cover plate assembly 100, which includes a cover plate 101, a pole 102 and a connecting piece 105, wherein the cover plate 101 is provided with a cover plate hole; one end of the pole 102 passes through the cover plate hole, and the other end of the pole 102 is located under the cover plate 101; the connecting piece 105 is located under the cover plate 101, and the connecting piece 105 includes a first connecting portion 106 and a second connecting portion 107 extending outward from the outer periphery of the first connecting portion 106, the side of the first connecting portion 106 is welded to the other end of the pole 102, and the second connecting portion 107 is used to be electrically connected to the winding core 200.

[0035] In the technical solution of the present utility model, the first connecting portion 106 is welded to the pole 102, and the second connecting portion 107 is connected to the winding core 200. The first connecting portion 106 is connected to the pole 102 by side welding, which not only does not increase the length of the connecting piece 105, but also reduces the size of the connecting piece 105 to a certain extent, thereby shortening the overcurrent path, improving the overcurrent capacity, reducing the resistance, and improving the performance of the battery 1000; at the same time, the structural strength of the connecting piece 105 itself is enhanced, and the first connecting portion 106 is welded to the pole 102, thereby improving the connection strength between the pole 102 and the first connecting portion 106.

[0036] In some embodiments, the first connection portion 106 and the second connection portion 107 are integrally formed.

[0037] Further, for the convenience of description, the pole 102 includes a first part 103 and a second part 104, the first part 103 is arranged above the second part 104, that is, one end of the pole 102 is the end where the first part 103 is located, and the other end of the pole 102 is the end where the second part 104 is located, the first part 103 and the second part 104 are integrally formed, and in the actual assembly process, the first part 103 passes through the cover plate hole and is fixed in the cover plate hole, and the second part 104 is connected to the first connecting part 106.

[0038] It should be noted that the positional relationship between the first connecting portion 106 and the second portion 104 is not limited, as long as they can be welded to the pole 102. Specifically, in this embodiment, please refer to Figure 1 and Figure 2 , the first connection part 106 is provided with a connection hole 108, the side of the first connection part 106 includes the hole wall of the connection hole 108, and the other end of the pole 102 is located in the connection hole 108 and welded to the hole wall of the connection hole 108. In the actual installation process, the second part 104 passes through the connection hole 108 and is clamped in the connection hole 108, and the outer side wall of the second part 104 abuts against the hole wall of the connection hole 108. After the second part 104 is clamped, the second part 104 and the first connection part 106 are welded by laser penetration welding, so that the outer side wall of the second part 104 and the hole wall of the connection hole 108 are welded together, thereby achieving the fixation of the second part 104 and the first connection part 106. In this way, the second part 104 partially overlaps with the first connection part 106, which reduces the difficulty of welding and improves the connection strength. At the same time, it can also shorten the overcurrent path, improve the overcurrent capacity, and reduce the resistance.

[0039] More specifically, see Figure 2 The height of the second part 104 is the same as the depth of the connecting hole 108, the second part 104 can be completely engaged in the connecting hole 108, and the contact area between the outer wall of the second part 104 and the hole wall of the connecting hole 108 is increased, thereby increasing the welding area between the second part 104 and the first connecting part 106, thereby improving the connection strength between the second part 104 and the first connecting part 106.

[0040] See also Figure 1, a gap is formed between the cover plate and the second connecting portion 107, and the function of the gap is to facilitate the welding of the first portion 103 and the first connecting portion 106. In order to ensure the structural stability of the cover plate assembly 100, the cover plate assembly 100 also includes an insulating member 109, which is arranged between the cover plate and the second connecting portion 107. After the welding of the second portion 104 and the first connecting portion 106 is completed, the insulating member 109 is clamped in the gap to support and fix the second connecting portion 107 to prevent the second connecting portion 107 from deforming and bending. In this embodiment, the insulating member 109 includes a first insulating portion 110 and a second insulating portion 111 which are separately arranged. The first insulating portion 110 and the second insulating portion 111 are arranged between the cover plate and the second connecting portion 107 of the connecting sheet 105, and are connected to each other to surround the outer side of the first connecting portion 106. Specifically, when the second part 104 is welded to the first connecting part 106, the first insulating part 110 is formed with a first snap-in groove, and the second insulating part 111 is formed with a second snap-in groove. The first insulating part 110 and the second insulating part 111 are enclosed to connect the first snap-in groove and the second snap-in groove to form a first hole, and the first hole is used for the first connecting part 106 to pass through. More specifically, during the installation process, the notch of the first snap-in groove is directed toward the first connecting part 106, and the notch of the second snap-in groove is also directed toward the first connecting part 106. The first snap-in groove and the second snap-in groove are close to each other until the groove wall of the first snap-in groove and the groove wall of the second snap-in groove abut against the outer side surface of the first connecting part 106. At this time, the first insulating part 110 and the second insulating part 111 surround the outer side surface of the first connecting part 106 to complete the installation of the insulating member 109. Such a configuration can not only reserve welding space to facilitate welding of the second portion 104 and the first connecting portion 106 , but also fix the second connecting portion 107 to prevent the second connecting portion 107 from bending and deformation.

[0041] Further, the connection method of the first insulating portion 110 and the second insulating portion 111 is not limited. For example, in one embodiment, the first insulating portion 110 and the second insulating portion 111 are fixedly connected. Figure 3, the first insulating part 110 is detachably connected to the second insulating part 111. As a preferred embodiment, the first insulating part 110 and the second insulating part 111 are detachably connected. On the one hand, the first insulating part 110 and the second insulating part 111 can be recycled. On the other hand, when there is a problem in the welding between the first part 103 and the first connecting part 106, or when there is a problem in the welding between the second connecting part 107 and the winding core 200, the first insulating part 110 and the second insulating part 111 can be disassembled for inspection.

[0042] In some embodiments, the first insulating portion 110 and the second insulating portion 111 are detachably connected, one of the first insulating portion 110 and the second insulating portion 111 is provided with a clamping hole 116, and the other is provided with a clamping portion 117, and the clamping portion 117 is clamped in the clamping hole 116. It should be noted that the specific number of the clamping holes 116 and the clamping portions 117 is not limited, and can be selected according to actual conditions.

[0043] See also Figure 4 and Figure 5 In one embodiment, the first insulating portion 110 includes a first body portion 112 and two first extension portions 113 extending from the first body portion 112, and the second insulating portion 111 includes a second body portion 114 and two second extension portions 115 extending from the second body portion 114, and each of the first extension portions 113 is connected to each of the second extension portions 115, so that the first insulating portion 110 and the second insulating portion 111 are fixed to each other. More specifically, one of the first extension portions 113 is provided with a clamping hole 116, and the second extension portion 115 corresponding to the first extension portion 113 is provided with a clamping portion 117; another of the first extension portions 113 is provided with a clamping portion 117, and the second extension portion 115 corresponding to the first extension portion 113 is provided with a clamping hole 116, and the clamping hole 116 and the clamping portion 117 cooperate to fix the first insulating portion 110 and the second insulating portion 111.

[0044] Further, in some embodiments, the clamping portion 117 clamps a clamping column 118 and two clamping arms 119, the clamping column 118 is arranged on the first extension portion 113 or the second extension portion 115, the two clamping arms 119 are arranged at intervals on the clamping column 118, a gap groove is formed between the two clamping arms 119, and the sum of the dimensions between the two clamping arms 119 and the gap groove is greater than the dimension of the clamping column 118. Specifically, in the actual clamping process, the two clamping arms 119 approach each other and pass through the clamping hole 116 until the support column is clamped in the clamping hole 116, and the two clamping arms 119 move away from each other, so that the sum of the dimensions between the two clamping arms 119 and the gap groove is greater than the dimension of the clamping hole 116, so that the clamping column 118 can be fixed in the clamping hole 116.

[0045] Please continue reading Figure 3 In order to ensure that the insulating member 109 is in a balanced state and reduce the total weight of the cover assembly 100, the first insulating portion 110 is provided with a first weight-reducing hole 120 connected to the clamping hole 116, and the second insulating portion 111 is provided with a second weight-reducing hole 121 adjacent to the clamping portion 117.

[0046] In some embodiments, an explosion-proof valve 122 is disposed on one of the first insulating portion 110 and the second insulating portion 111. When the gas pressure in the battery 1000 is abnormal, the explosion-proof valve 122 opens to discharge the gas in the battery 1000, thereby preventing the battery 1000 from exploding and improving the safety of the battery 1000.

[0047] In some embodiments, see Figure 2 , the end of the pole 102 welded to the first connecting portion 106 is the first end, and the diameter of the first end is D, wherein 6mm≤D≤20mm. Specifically, the diameter of the end of the pole 102 welded to the connecting portion is 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, 15mm, 15.5mm, 16mm, 16.5mm, 17mm, 17.5mm, 18mm, 18.5mm, 19mm, 19.5mm, 20mm.

[0048] In some embodiments, see Figure 2, the height of the first connection part 106 is H1, and the height of the second connection part 107 is H2, wherein 2.5mm≤H1+H2≤5mm. It should be noted that H1+H2 is the height of the connecting piece 105. When the height of the connecting piece 105 is lower than 2.5mm, the heights of the first connecting part 106 and the second connecting part 107 will also be reduced accordingly, and the connection strength between the first connecting part 106 and the tab will be reduced, and the connection strength between the second connecting part 107 and the winding core 200 will also be reduced, resulting in a reduction in the connection strength of the entire battery 1000. When the height of the connecting piece 105 is higher than 5mm, the space occupied by the connecting piece 105 increases, resulting in an increase in the current path and an increase in the internal resistance. Specifically, the height of the connecting piece 105 can be 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, or 5.0mm.

[0049] For further information, see Figure 2 , the second connection part 107 is used to weld with the winding core 200, and the thickness of the second connection part 107 should not be too thick or too thin. Specifically, in this embodiment, 0.3mm≤H2≤1.0mm. It should be noted that when the thickness of the second connection part 107 is less than 0.3mm, the second connection part 107 itself is thin and easy to break, resulting in a reduced service life of the battery 1000. When the thickness of the second connection part 107 exceeds 1mm, the difficulty of welding the second connection part 107 to the winding core 200 increases. More specifically, the thickness of the second connecting portion 107 is 0.3mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, 0.35mm, 0.36mm, 0.37mm, 0.38mm, 0.39mm, 0.40mm, 0.42mm, 0.44mm, 0.45mm, 0.46mm, 0.48mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.91mm, 0.92mm, 0.93mm, 0.94mm, 0.95mm, 0.96mm, 0.97mm, 0.98mm, 0.99mm, and 1.0mm.

[0050] The utility model also provides a battery 1000, see Figure 6, the battery 1000 includes a cover plate assembly 100 and a winding core 200. The cover plate assembly 100 is arranged on the winding core, and the connecting piece 105 is welded and connected to the winding core 200. The specific structure of the cover plate assembly 100 refers to the above embodiment. Since the present battery 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0051] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate, provided with a cover plate hole; A pole, one end of which passes through the cover plate hole, and the other end of which is located under the cover plate; as well as, A connecting piece is located under the cover plate, and includes a first connecting portion and a second connecting portion extending outward from the outer periphery of the first connecting portion, the side of the first connecting portion is welded to the other end of the pole, and the second connecting portion is used to electrically connect to the winding core.

2. The cover plate assembly according to claim 1, characterized in that: The first connecting portion is provided with a connecting hole, the side surface of the first connecting portion includes a hole wall of the connecting hole, and the other end of the pole is located in the connecting hole and welded to the hole wall of the connecting hole.

3. The cover plate assembly according to claim 1, characterized in that: It also includes an insulating member, which includes a first insulating portion and a second insulating portion that are separately arranged. The first insulating portion and the second insulating portion are arranged between the cover plate and the second connecting portion of the connecting piece, and are connected to each other to surround the outer side surface of the first connecting portion.

4. The cover plate assembly according to claim 3, characterized in that: The first insulating part is detachably connected to the second insulating part.

5. The cover plate assembly according to claim 3, characterized in that: One of the first insulating part and the second insulating part is provided with a clamping hole, and the other one is provided with a clamping part, and the clamping part is clamped in the clamping hole.

6. The cover plate assembly according to claim 5, characterized in that: The first insulating part is provided with a first weight-reducing hole connected to the clamping hole, and the second insulating part is provided with a second weight-reducing hole adjacent to the clamping part.

7. The cover plate assembly according to any one of claims 3 to 6, characterized in that: An explosion-proof valve is provided on one of the first insulating part and the second insulating part.

8. The cover plate assembly according to any one of claims 1 to 6, characterized in that: One end of the pole welded to the first connecting portion is the first end, and the diameter of the first end is D, wherein 6 mm≤D≤20 mm.

9. The cover plate assembly according to any one of claims 1 to 6, characterized in that: The height of the first connection portion is H1, and the height of the second connection portion is H2, wherein 0.3 mm ≤ H2 ≤ 1.0 mm, and 2.5 mm ≤ H1 + H2 ≤ 5 mm.

10. A battery, characterized in that: Comprising the cover plate assembly as described in any one of claims 1-9.

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