Connecting piece, battery and electric equipment

Abstract

The utility model relates to a connecting piece, a battery and electric equipment. The connecting piece comprises a connecting piece main body and heat dissipation fins, the connecting piece main body is provided with a first welding area used for being connected with the tab and a second welding area used for being connected with the pole, and the first welding area is located on one side of the second welding area. The heat dissipation fins are connected with the connecting piece body and located on the side, away from the first welding area, of the second welding area. According to the connecting piece, the battery and the electric equipment, the heat accumulation on the connecting piece is avoided, the thermal deformation of the upper plastic part on the top cover is further avoided, the compression ratio of the sealing ring between the top cover of the battery and the shell is ensured, the sealing performance of the battery is further ensured, and the safety of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a connecting sheet, a battery and an electric device. BACKGROUND

[0002] A battery generally comprises a shell, a winding core, a top cover and a connecting sheet, the winding core is arranged in the shell, the top cover is used for closing the shell, the top cover is provided with a pole, and the connecting sheet connects the pole and a tab on the winding core, so as to collect the current generated by the winding core and guide the current to the pole.

[0003] In the current battery assembly process, the tabs of the winding core are usually connected to the connecting sheet by ultrasonic welding, and the poles of the top cover are connected to the connecting sheet by laser welding. However, in the process of laser welding, the heat generated is easy to gather in the connecting sheet, thereby causing the upper plastic part on the top cover to be deformed by heat, and the compression rate of the sealing ring between the top cover and the shell is affected by the deformation of the upper plastic part by heat, thereby causing the sealing performance of the battery to decrease and causing a safety hazard. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a connecting sheet, a battery and an electric device for reducing the heat gathering problem of the connecting sheet of the battery in the welding process.

[0005] In a first aspect, the present application provides a connecting sheet for connecting a tab and a pole of a battery, the connecting sheet comprising:

[0006] a connecting sheet body, the connecting sheet body being provided with a first welding area for connecting the tab and a second welding area for connecting the pole, the first welding area being located on one side of the second welding area;

[0007] a heat dissipation fin connected to the connecting sheet body, and the heat dissipation fin being located on the side of the second welding area away from the first welding area.

[0008] The technical solutions are further described as follows:

[0009] In one embodiment, the number of heat dissipation fins is multiple, and all the heat dissipation fins are arranged on the connecting sheet body in a first direction.

[0010] In one embodiment, the distance between two adjacent heat dissipation fins is 3-6 mm.

[0011] In one embodiment, the length of the heat dissipation fin is greater than or equal to 6 mm; and / or, the width of the heat dissipation fin is 1-2 mm.

[0012] In one of the embodiments, the heat dissipation fin comprises a root connected with the tab body and a top away from the tab body, wherein the width of the root is greater than the width of the top.

[0013] In one of the embodiments, the distance between the heat dissipation fin and the second welding area is 2-4mm.

[0014] In one of the embodiments, the tab body comprises a body part and an extension part protruding from one side of the body part, the width of the extension part is less than the width of the body part, the first welding area is arranged on the body part, the second welding area is arranged across the body part and the extension part, and the heat dissipation fin is arranged on the side of the extension part away from the body part.

[0015] In a second aspect, the application further provides a battery comprising a winding core, a top cover and the tab described above, wherein the winding core is provided with a tab lug, the top cover is provided with a pole, the first welding area of the tab is welded with the tab lug, and the second welding area of the tab is welded with the pole.

[0016] In a third aspect, the application further provides a power consuming device comprising the battery described above.

[0017] In the tab, the battery and the power consuming device described above, the first welding area for connecting with the tab lug and the second welding area for connecting with the pole are arranged on the tab body, and the heat dissipation fin is arranged on the side of the second welding area away from the first welding area, the heat dissipation fin can increase the heat dissipation area of the side of the tab body away from the first welding area, so that when heat is generated by the welding of the second welding area and the pole, the heat transferred in the direction close to the first welding area can be dissipated through the tab lug connected with the first welding area, and the heat transferred in the direction away from the first welding area can be quickly dissipated through the heat dissipation fin, thereby avoiding the accumulation of heat on the tab, avoiding the deformation of the upper plastic part of the top cover due to heat, ensuring the compression rate of the sealing ring between the battery top cover and the shell, and further ensuring the sealing performance of the battery and improving the safety of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and are used to interpret the application together with the description of the illustrative embodiments of the present application, and do not constitute improper limitations to the present application.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and other accompanying drawings can be obtained by those skilled in the art without any creative effort.

[0020] In addition, the drawings are not drawn to scale 1:1, and the relative sizes of the various elements are drawn in the drawings only exemplarily and not necessarily to scale. In the drawings:

[0021] Figure 1 Structure diagram of the battery of an embodiment.

[0022] Figure 2 Structure diagram of the battery of an embodiment. Figure 1 Top view of the battery shown in FIG.

[0023] Figure 3 Structure diagram of the battery of an embodiment. Figure 1 Bottom view of the battery shown in FIG.

[0024] Figure 4 Structure diagram of the connecting piece of an embodiment.

[0025] Figure 5 Structure diagram of the connecting piece of an embodiment. Figure 4 Partial enlarged view of A in FIG.

[0026] Explanation of reference signs:

[0027] 10, connecting piece; 11, connecting piece main body; 111, body portion; 112, extension portion; 12, heat dissipation fin; 131, first welding area; 132, second welding area; 14, avoiding groove; 20, winding core; 21, tab; 30, top cover; 31, pole; 32, liquid injection hole. DETAILED DESCRIPTION

[0028] In order to make the above objectives, features and advantages of the present application more apparent, a detailed description of the specific embodiments of the present application will be given below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0029] In the description of the present application, if the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0030] In addition, the terms "first", "second", and the like, if any, are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or implicating the number of indicated technical features. Thus, a feature defined with "first" or "second" can include at least one of the features, explicitly or implicitly. In the description of the present application, the term "plurality" means at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0031] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection", "fixing" and the like should be interpreted in a broad sense. For example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise explicitly specified and limited, if there is a description such as "on" or "under" of the first feature to the second feature, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only means that the first feature is lower than the second feature in horizontal height.

[0033] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0034] As mentioned earlier, during the laser welding process of traditional connecting tabs to the terminals on the battery top cover, the heat generated tends to accumulate on the outer side of the connecting tab, causing deformation of the upper plastic component on the top cover. This leads to a decrease in battery sealing performance and poses a safety hazard. The inventors, through extensive research, discovered that the reason lies in the following: During battery assembly, the inner side of the connecting tab is typically ultrasonically welded to the tab of the core, and then the other end of the connecting tab is laser-welded to the terminal of the top cover. In this process, when the heat generated during laser welding is transferred to both sides, the heat transferred along the inner side of the connecting tab can be quickly dissipated through the tab, while the heat transferred along the outer side has no effective heat dissipation path, causing heat to accumulate on the outer side of the connecting tab. This leads to heat deformation of the upper plastic component on the top cover, which in turn affects the compression ratio of the sealing ring between the top cover and the casing, further reducing battery sealing performance and causing safety hazards.

[0035] See Figures 1 to 5 Based on this, one embodiment of this application provides a connecting piece 10 for connecting the battery tab 21 and the terminal post 31. This connecting piece 10 has good heat dissipation capabilities and can prevent heat accumulation. Specifically, see... Figure 4 In one embodiment, the connecting piece 10 includes a connecting piece body 11 and a heat dissipation fin 12. The connecting piece body 11 has a first welding area 131 for connecting with the tab 21 and a second welding area 132 for connecting with the post 31. The first welding area 131 is located on one side of the second welding area 132. The heat dissipation fin 12 is connected to the connecting piece body 11 and is located on the side of the second welding area 132 opposite to the first welding area 131.

[0036] In the aforementioned connecting piece 10, the main body 11 of the connecting piece is provided with a first welding area 131 for connecting with the tab 21 and a second welding area 132 for connecting with the terminal post 31. A heat dissipation fin 12 is provided on the side of the second welding area 132 away from the first welding area 131. The heat dissipation fin 12 can increase the heat dissipation area of ​​the main body 11 of the connecting piece away from the first welding area 131. Thus, when the second welding area 132 is welded to the terminal post 31 and heat is generated, the heat transferred in the direction close to the first welding area 131 can be dissipated through the tab 21 connected to the first welding area 131, while the heat transferred in the direction away from the first welding area 131 can be quickly dissipated through the heat dissipation fin 12. This avoids heat accumulation on the connecting piece 10, avoids heat deformation of the upper plastic part on the top cover 30, ensures the compression ratio of the sealing ring (not shown) between the battery top cover 30 and the shell (not shown), thereby ensuring the sealing performance of the battery and improving battery safety.

[0037] See Figure 4 as well as Figure 5In an embodiment, the number of the heat dissipation fins 12 is multiple, and all the heat dissipation fins 12 are arranged on the connecting piece body 11 in a first direction. Specifically, the first direction can be the width direction of the connecting piece body 11. By dissipating heat through multiple heat dissipation fins 12, the heat dissipation efficiency of the connecting piece 10 can be further improved.

[0038] Referring to Figure 5 The distance m between the two adjacent heat dissipation fins 12 is 3-6 mm. If the distance m between the two adjacent heat dissipation fins 12 is too small, the air circulation between the heat dissipation fins 12 will be affected, which is not conducive to improving the heat dissipation. If the distance m between the two adjacent heat dissipation fins 12 is too large, the number of the heat dissipation fins 12 in a unit area will be reduced, which will reduce the heat dissipation area and is also not conducive to improving the heat dissipation. Therefore, by configuring the distance m between the heat dissipation fins 12 as 3-6 mm, the air circulation between the heat dissipation fins 12 is ensured, and a sufficient number of heat dissipation fins 12 in a unit area is ensured, which is more conducive to improving the heat dissipation. For example, the distance m between the two adjacent heat dissipation fins 12 can be 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, or 6 mm.

[0039] Referring to Figure 5 Optionally, in an embodiment, the length L of the heat dissipation fin 12 is greater than or equal to 6 mm, and the width D of the heat dissipation fin 12 is 1-2 mm, so as to ensure that the heat dissipation fin 12 has sufficient heat dissipation area and improve the heat dissipation efficiency. For example, the length L of the heat dissipation fin 12 can be 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm. The width D of the heat dissipation fin 12 can be 1 mm, 1.3 mm, 1.6 mm, 1.8 mm, or 2 mm.

[0040] Referring to Figure 5 In an embodiment, the heat dissipation fin 12 includes a root connected with the connecting piece body 11 and a top away from the connecting piece body 11, and the width of the root is greater than the width of the top. That is, the heat dissipation fin 12 has a structure that the top is thin and the root is thick. In this way, on the one hand, the heat dissipation performance of the heat dissipation fin 12 can be improved, and on the other hand, the thick root can also prevent the heat dissipation fin 12 from being easily broken. For example, the included angle a between the two side surfaces of the heat dissipation fin 12 is 4-10°.

[0041] Referring to Figure 4In an embodiment, the distance M between the heat dissipation fin 12 and the second welding area 132 is 2-4 mm. Specifically, if the distance M between the heat dissipation fin 12 and the second welding area 132 is too small, the welding stability between the second welding area 132 and the pole 31 is affected, and if the distance M between the heat dissipation fin 12 and the second welding area 132 is too large, the heat cannot be timely conducted out. Therefore, by configuring the distance M between the heat dissipation fin 12 and the second welding area 132 as 2-4 mm, the heat dissipation fin 12 is made as close to the second welding area 132 as possible while ensuring the welding stability between the second welding area 132 and the pole 31, so that the heat can be timely conducted out. For example, the distance M between the heat dissipation fin 12 and the second welding area 132 can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, or 4 mm, etc.

[0042] Continuing to refer to Figure 4 In an embodiment, the connecting sheet body 11 includes a body portion 111 and an extension portion 112, the extension portion 112 is protrudingly arranged on one side of the body portion 111, the width of the extension portion 112 is smaller than the width of the body portion 111, the first welding area 131 is arranged on the body portion 111, the second welding area 132 is arranged across the body portion 111 and the extension portion 112, and the heat dissipation fin 12 is arranged on the side of the extension portion 112 away from the body portion 111. In this way, the connecting sheet 10 is matched with the internal structure of the battery, and the installation of the connecting sheet 10 is facilitated.

[0043] Continuing to refer to Figure 3 and Figure 4 In an embodiment, the side of the connecting sheet body 11 away from the heat dissipation fin 12 is provided with a relief groove 14, the relief groove 14 is arranged in alignment with the liquid injection hole 32 on the top cover 30 of the battery. In this way, the connecting sheet 10 does not block the liquid injection hole 32 on the top cover 30, and the battery can inject liquid into the inside through the liquid injection hole 32.

[0044] Optionally, in an embodiment, the number of the first welding areas 131 is multiple, all the first welding areas 131 are arranged in the width direction of the connecting sheet body 11, and all the first welding areas 131 are located on the side of the second welding area 132 away from the heat dissipation fin 12. In this way, the connecting sheet 10 can be connected with multiple jelly rolls 20 at the same time, so as to collect the current of the multiple jelly rolls 20 and guide the current to the pole 31, and the current output capability of the battery is improved. For example, as shown in Figure 4 the connecting sheet body 11 is provided with two first welding areas 131, and the two first welding areas 131 are connected with the two jelly rolls 20 respectively.

[0045] An embodiment of the present application also provides a battery, which can be a lead-acid battery, a lithium battery, etc. without limitation. Specifically, referring to Figure 1The battery of one embodiment includes the winding core 20, the top cover 30, and the tab 10 of any of the above embodiments, wherein the winding core 20 is provided with the lug 21, the top cover 30 is provided with the pole 31, the first welding area 131 of the tab 10 is welded to the lug 21, and the second welding area 132 of the tab 10 is welded to the pole 31. For example, the first welding area 131 of the tab 10 is ultrasonic welded to the lug 21, and the second welding area 132 of the tab 10 is laser welded to the pole 31. Further, the winding core 20 has a positive lug and a negative lug, the top cover 30 has a positive pole and a negative pole, and the battery has two tabs 10, one of which connects the positive lug and the positive pole, and the other of which connects the negative lug and the negative pole.

[0046] One embodiment of the application further provides a power consuming device, and one embodiment of the device includes the battery of any of the above embodiments. Further, the power consuming device further includes a power consuming body, and the power consuming body is electrically connected to the battery. Specifically, the power consuming body can be in various forms, such as a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric automobile, a ship, a spacecraft, an electric toy, an electric tool, and the like, which are not limited herein.

[0047] Any of the technical features of the above embodiments can be combined. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictions, they shall be considered as the scope of the present application.

[0048] The above embodiments only express several implementation manners of the application, and the description is specific and detailed, however, it shall not be understood as the limitation to the patent application scope. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the application, which shall be considered as the protection scope of the present application. Therefore, the patent protection scope of the present application shall be subject to the appended claims.

Claims

1. A connecting piece for connecting a battery's tab and a terminal post, characterized in that, The connecting piece includes: The connecting piece body has a first welding area for connecting with the electrode tab and a second welding area for connecting with the electrode post, wherein the first welding area is located on one side of the second welding area; The heat dissipation fins are connected to the connecting plate body, and the heat dissipation fins are located on the side of the second welding area away from the first welding area.

2. The connecting piece according to claim 1, characterized in that, The number of heat dissipation fins is multiple, and all the heat dissipation fins are arranged at intervals along the first direction on the connecting plate body.

3. The connecting piece according to claim 2, characterized in that, The spacing between two adjacent heat dissipation fins is 3mm-6mm.

4. The connecting piece according to claim 1, characterized in that, The length of the heat dissipation fins is greater than or equal to 6 mm; and / or the width of the heat dissipation fins is 1 mm to 2 mm.

5. The connecting piece according to claim 1, characterized in that, The heat dissipation fin includes a root portion connected to the connecting plate body and a top portion away from the connecting plate body, wherein the width of the root portion is greater than the width of the top portion.

6. The connecting piece according to claim 1, characterized in that, The distance between the heat dissipation fins and the second welding area is 2mm-4mm.

7. The connecting piece according to claim 1, characterized in that, The connecting piece body includes a main body and an extension. The extension protrudes from one side of the main body and has a width smaller than that of the main body. A first welding area is disposed on the main body, and a second welding area spans the main body and the extension. The heat dissipation fins are disposed on the side of the extension away from the main body.

8. The connecting piece according to claim 1, characterized in that, The connecting piece body has a clearance groove on the side opposite to the heat dissipation fins, the clearance groove being aligned with the liquid injection hole on the top cover of the battery; and / or, There are multiple first welding areas, all of which are spaced apart along the width direction of the connecting piece body, and all of the first welding areas are located on the side of the second welding area away from the heat dissipation fins.

9. A battery, characterized in that, The device includes a core, a top cover, and a connecting piece according to any one of claims 1-8, wherein the core is provided with an electrode lug, the top cover is provided with an electrode post, the first welding area of ​​the connecting piece is welded to the electrode lug, and the second welding area of ​​the connecting piece is welded to the electrode post.

10. An electrical appliance, characterized in that, Includes the battery as described in claim 9.

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