Electric connection structure and battery pack

Abstract

The utility model discloses an electric connection structure and a battery pack, the electric connection structure comprises a heating member and an electric connection plate, the heating member comprises a heating sheet and a heat conduction plate, the heating sheet is arranged on the heat conduction plate, and the heat conduction plate is provided with a welding avoidance hole; a welding area is arranged on the electric connecting plate, a welding hole is formed in the welding area, the heating piece is arranged on one side face of the electric connecting plate, and the welding avoiding hole is aligned with the welding area so that the welding hole can be exposed. Thus, the heating piece is arranged on the heat conduction plate, so that the heating piece can directly and rapidly conduct heat to the electric connection plate through the heat conduction plate, the minimum heat energy loss of the heating body and the heated body is achieved, and the heating conversion efficiency is improved. And meanwhile, the heat conduction plate is provided with the welding avoiding hole, so that the welding hole of the electric connection plate is exposed, and welding operation is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to an electric connection structure and battery pack. BACKGROUND

[0002] The electrochemical performance of the battery is affected in the low temperature environment, resulting in the battery capacity decline, the charge and discharge efficiency reduces etc. Therefore, in order to improve the performance of battery in low temperature environment, usually need to heat the battery. The traditional heating mode of battery is usually directly increasing independent heating functional element on the battery, but this heating functional element has great heat loss and low conversion efficiency in the heating process. SUMMARY

[0003] The utility model discloses a kind of electric connection structure and battery pack with heating function, to reduce heat loss, improve heating conversion efficiency, overcome the deficiencies in prior art.

[0004] The utility model discloses a kind of electric connection structure and battery pack with heating function, to reduce heat loss, improve heating conversion efficiency, overcome the deficiencies in prior art.

[0005] An electric connection structure, comprising: heating piece and electric connection plate, the heating piece includes heating sheet and heat conduction plate, the heating sheet is set on the heat conduction plate, and the heat conduction plate is provided with welding avoidance hole;The electric connection plate is provided with welding area, the welding area is provided with welding hole, the heating piece is set on the side surface of the electric connection plate, the welding avoidance hole is aligned with the welding area, so that the welding hole is exposed.

[0006] In one embodiment, it further includes bottom insulating sheet, and the bottom insulating sheet is located between the heating piece and the electric connection plate.

[0007] In one embodiment, the first avoidance hole is opened on the bottom insulating sheet, and the welding avoidance hole, the first avoidance hole and the welding area are sequentially aligned, so that the welding hole is exposed.

[0008] In one embodiment, it further includes top insulating sheet, and the top insulating sheet is set on the side surface of the heating piece away from the electric connection plate.

[0009] In one embodiment, the second avoidance hole is opened on the top insulating sheet, and the second avoidance hole, the welding avoidance hole, the first avoidance hole and the welding area are sequentially aligned, so that the welding hole is exposed.

[0010] In one embodiment, the bottom insulating sheet or / and the top insulating sheet is polyimide insulating sheet.

[0011] In one of the embodiments, the heat conduction plate is provided with a limiting groove, and the heating sheet is embedded in the limiting groove.

[0012] In one of the embodiments, the heat conduction plate is a heat conduction aluminum plate.

[0013] In one of the embodiments, the periphery of the electric connection plate is provided with a limiting protrusion.

[0014] A battery pack comprising the electric connection structure, further comprising a cell group and a support, the support is provided with a mounting groove, the electric connection structure is accommodated in the mounting groove, and the electric connection plate is used for forming electric connection of each single cell in the cell group.

[0015] Compared with the prior art, the utility model has at least the following advantages:

[0016] 1、 the electric connection structure of the utility model is integrated by the heating piece and the electric connection plate to reduce heat loss, specifically, the heating sheet is arranged on the heat conduction plate, so that the heating sheet can directly conduct heat to the electric connection plate through the heat conduction plate, the minimum heat energy loss of the heating body and the heated body is realized, and the heating conversion efficiency is improved.

[0017] 2、 the electric connection structure of the utility model is integrated by the heat conduction plate and the electric connection plate, when the battery pack does not need to be heated, the heat conduction plate can also accelerate the heat dissipation of the electric connection plate, so that the increase of the resistance of the electric connection plate caused by high temperature can be avoided, and the overcurrent capacity of the electric connection plate can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings needed in the embodiments will be briefly introduced below.

[0019] Figure 1 It is the structural schematic diagram of the electric connection structure in an embodiment of the utility model;

[0020] Figure 2 It is the structural schematic diagram of the battery pack in an embodiment of the utility model. DETAILED DESCRIPTION

[0021] In order to facilitate understanding of the utility model, the utility model will be more fully described below with reference to the related drawings.

[0022] Please refer to Figure 1As shown, an electric connection structure 13 comprises a heating piece 100 and an electric connection plate 200, the heating piece 100 comprises a heating sheet 110 and a heat conduction plate 120, the heating sheet 110 is arranged on the heat conduction plate 120, and the heat conduction plate 120 is provided with a welding avoiding hole 121; the electric connection plate 200 is provided with a welding area A, the welding area A is provided with a welding hole 210, the heating piece 100 is arranged on one side surface of the electric connection plate 200, the welding avoiding hole 121 is aligned with the welding area A, so that the welding hole 210 is exposed.

[0023] It should be noted that, by arranging the heating piece 100 on one side surface of the electric connection plate 200, the heating piece 100 and the electric connection plate 200 are integrated as a whole, so that the heat loss can be reduced. Specifically, the heating sheet 110 is installed on the heat conduction plate 120, wherein the end lead of the heating sheet 110 is connected to realize the electric heating of the heating sheet 110, and the heat generated by the heating sheet is directly and quickly conducted to the electric connection plate 200 through the heat conduction plate 120, so as to realize the full contact conduction of heat between the heating piece 100 and the electric connection plate 200, and further realize the minimum heat loss of the heating body and the heated body. Therefore, compared with the existing separate heating functional element, the heat loss caused by the intermediate medium conduction can be greatly reduced, so as to improve the heating conversion efficiency. Meanwhile, the welding avoiding hole 121 is arranged on the heat conduction plate 120, so that the welding hole 210 of the electric connection plate 200 is exposed, thereby facilitating the automatic welding operation, and further improving the production efficiency. In this way, the electric connection structure 13 can simultaneously have the electric connection function and the heating function, thereby reducing the components of the battery pack 10 and optimizing the manufacturing process.

[0024] It should be further noted that, when the battery pack 10 does not need to be heated, the heat conduction plate 120 can also accelerate the heat dissipation of the electric connection plate 200, so that the increase of the resistance of the electric connection plate 200 caused by high temperature can be avoided, and the overcurrent capacity of the electric connection plate 200 can be improved. That is, under the premise of the same material and cross section of the electric connection plate 200, the heat dissipation of the electric connection structure 13 of the utility model is faster, and the overcurrent capacity is stronger. Therefore, the heat conduction plate 120 and the electric connection plate 200 are integrated as a whole, so that the heat dissipation effect of the electric connection plate 200 can be greatly improved. In the embodiment, the electric connection plate 200 can be a metal material with good conductivity, such as aluminum or copper.

[0025] In an embodiment, the electric connection structure 13 further comprises a bottom insulating sheet 300, which is arranged between the heating element 100 and the electric connection plate 200. The heating element 100 and the electric connection plate 200 are separated by the bottom insulating sheet 300 to avoid the influence of the heating element 100 on the electric conduction of the electric connection plate 200. In the present embodiment, the bottom insulating sheet 300 is provided with a first avoiding hole 310, and the welding avoiding hole 121, the first avoiding hole 310 and the welding area A are aligned in sequence to expose the welding hole 210. In this way, the automatic welding operation can be facilitated, and the production efficiency can be improved.

[0026] Further, the electric connection structure 13 further comprises a top insulating sheet 400, which is arranged on the side of the heating element 100 away from the electric connection plate 200. In this way, the heating element 100 and the electric connection plate 200 are covered by the top insulating sheet 400, which can further improve the insulation effect to meet the electrical insulation safety requirements. In the present embodiment, the top insulating sheet 400 is provided with a second avoiding hole 410, and the second avoiding hole 410, the welding avoiding hole 121, the first avoiding hole 310 and the welding area A are aligned in sequence to expose the welding hole 210. In the same way, the automatic welding operation can be facilitated by exposing the welding hole 210 of the electric connection plate 200, and the production efficiency can be improved. The bottom insulating sheet 300 and the top insulating sheet 400 can be any existing insulating material, and preferably, the bottom insulating sheet 300 or / and the top insulating sheet 400 is a polyimide insulating sheet.

[0027] It should be further noted that, since the existing electric connection structure 13 in the battery pack 10 usually only plays an electric connection role, the electrically connected exposed part usually needs to be separately provided with an insulating component, which will increase the assembly process of the battery pack 10, complicate the structure of the battery pack 10 and reduce the production efficiency. The electric connection structure 13 of the present application integrates the heating function, the insulation function and the electric connection function into one whole, realizes the integrated design of the insulating sheet, the heating element 100 and the electric connection plate 200, for example, the top insulating sheet 400, the heating element 100, the bottom insulating sheet 300 and the electric connection plate 200 are integrally and complexly formed, so that the electric connection structure 13 not only has the heating and electric connection functions, but also has the insulation function. In this way, the production efficiency can be improved, and the insulation safety of the electrically connected exposed part can be improved, so that the electric connection structure 13 is more in line with the safety requirements of the product in various different actual application environments.

[0028] In an embodiment, the heat conduction plate 120 is provided with a limiting groove, and the heating sheet 110 is embedded in the limiting groove. That is, the heating sheet 110 is embedded on the heat conduction plate 120, so that the thickness of the heating element 100 can be reduced, and the weight of the battery pack 10 can be reduced to a certain extent to realize the lightweight design.

[0029] Further, the heat conduction plate 120 is a heat conduction aluminum plate. The aluminum metal material has good heat dissipation and heat conduction effect, which can greatly reduce heat loss during heating, and can also accelerate the heat dissipation of the electric connection plate 200 during heat dissipation, thereby improving the overcurrent capacity of the electric connection plate 200. For example, the heat conduction plate 120 can be an aluminum plate or an aluminum material envelope, and preferably an aluminum material envelope.

[0030] In an embodiment, the periphery of the electric connection plate 200 is provided with a limiting protrusion 220. After the electric connection structure 13 is installed on the battery pack 10, the limiting protrusion 220 plays a role of positioning the electric connection structure 13, thereby avoiding problems such as position deviation of the electric connection structure 13, which affects welding or the conductivity of the battery. In the present embodiment, the limiting protrusions 220 are provided at multiple positions, and each limiting protrusion 220 is arranged around the periphery of the electric connection plate 200, thereby further ensuring the positional accuracy of the electric connection structure 13. Further, in the present embodiment, the edges of the top insulating sheet 400, the heating element 100, the bottom insulating sheet 300, and the electric connection plate 200 are all aligned after stacking, so the limiting protrusions 220 are arranged at the edges of the top insulating sheet 400, the heating element 100, the bottom insulating sheet 300, and the electric connection plate 200, and the electric connection structure 13 can be integrally formed by die cutting.

[0031] A battery pack 10 includes a cell group 11, a support 12, and an electric connection structure 13. The support 12 is provided with a mounting groove, and the electric connection structure 13 is accommodated in the mounting groove. The electric connection plate 200 is used to form an electrical connection between the single cells in the cell group 11. The mounting groove has a shape that matches the shape of the electric connection structure 13. In this way, the electric connection structure 13 is positioned by the mounting groove to ensure the positional accuracy of the electric connection structure 13. In the present embodiment, the electric connection structure 13 is installed in the mounting groove of the support 12 and is fixed by gluing. The support 12 includes an upper support and a lower support, and the upper support and the lower support are both provided with mounting grooves for mounting the electric connection structure 13. Meanwhile, the cell group 11 includes a plurality of cylindrical cells, and the upper support and the lower support are respectively provided with positioning grooves 12a for fixing the cylindrical cells. The upper support and the lower support limit and fix the cylindrical cells to ensure the positional accuracy of the cylindrical cells, so that the electric connection structure 13 can be used to electrically connect the cylindrical cells, thereby ensuring the accuracy of the welding position of the electric connection structure 13.

[0032] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the utility model concept, several modifications and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. An electrical connection structure, characterized by comprising: The electric connection structure comprises: a heating piece, which comprises a heating sheet and a heat-conducting plate, the heating sheet being arranged on the heat-conducting plate, and the heat-conducting plate being provided with a welding-avoiding hole; and an electric connection plate, which is provided with a welding area, the welding area being provided with a welding hole, the heating piece being arranged on one side of the electric connection plate, and the welding-avoiding hole being aligned with the welding area so that the welding hole is exposed.

2. The electrical connection structure according to claim 1, characterized by A bottom insulating sheet is further arranged between the heating piece and the electric connection plate.

3. The electrical connection structure according to claim 2, characterized in that The bottom insulating sheet is provided with a first avoiding hole, and the welding-avoiding hole, the first avoiding hole and the welding area are sequentially aligned so that the welding hole is exposed.

4. The electrical connection structure according to claim 3, characterized in that A top insulating sheet is further arranged on the side of the heating piece away from the electric connection plate.

5. The electrical connection structure according to claim 4, characterized in that The top insulating sheet is provided with a second avoiding hole, and the second avoiding hole, the welding-avoiding hole, the first avoiding hole and the welding area are sequentially aligned so that the welding hole is exposed.

6. The electrical connection structure according to claim 4, characterized by The bottom insulating sheet and / or the top insulating sheet is a polyimide insulating sheet.

7. The electrical connection structure according to any one of claims 2 to 6, characterized in that, The heat-conducting plate is provided with a limiting groove, and the heating sheet is embedded in the limiting groove.

8. The electrical connection structure according to claim 7, characterized by The heat-conducting plate is a heat-conducting aluminum plate.

9. The electrical connection structure according to any one of claims 2 to 6, wherein The electric connection plate is provided with a limiting protruding part around the periphery.

10. A battery pack, characterized by, The electric connection structure comprises the electric connection structure according to any one of claims 1-9, further comprising an electric core group and a support, the support being provided with a mounting groove, the electric connection structure being accommodated in the mounting groove, and the electric connection plate being used to form electric connection among each single electric core in the electric core group.

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