CN218384537U - High temperature resistant insulating copper bar structure, power battery and vehicle - Google Patents

Abstract

The utility model discloses a high temperature resistant insulating copper bar structure, a power battery and a vehicle, which comprises a copper bar body and connecting parts arranged at two ends of the copper bar body, wherein a first high temperature resistant insulator and a second high temperature resistant insulator are arranged outside the copper bar body along the length direction of the copper bar body in a staggered manner; the first high-temperature-resistant insulator is sequentially provided with a Teflon layer, a tin foil layer and a PVC layer from inside to outside; the second high-temperature-resistant insulator is sequentially provided with a Teflon layer and a PVC layer from inside to outside. The utility model discloses have better high temperature resistant insulating properties, even also can keep the insulating ability of copper bar under high temperature to the risk of short circuit appears when taking place thermal runaway has effectively been prevented to power battery.

Description

High temperature resistant insulating copper bar structure, power battery and vehicle

Technical Field

The utility model belongs to the technical field of the power battery module, concretely relates to high temperature resistant insulating copper bar structure, power battery and vehicle.

Background

The copper bar in the power battery is connected with the battery module, the high-voltage component, the high-voltage connector and other parts, the copper bar in the high-voltage box does not need insulation treatment usually, but in other exposed areas, an insulation layer needs to be covered on the surface of the copper bar to meet the safety requirement. In the prior art, the copper bar insulating layer usually adopts the modes of plastic dipping, powder dipping, heat-shrinkable sleeves and the like, the normal working temperature of the materials is generally about 100 ℃, but when the electric core is out of control due to heat, the instantaneous temperature can reach 1000 ℃, under the condition, the copper bar can lose insulation, and the risk of short circuit and further battery ignition exists; high-temperature-resistant materials such as ceramic composite silica gel belts are wound on the outer surface of the copper bar, the two ends of the copper bar are fixed by adhesive tapes or plastic clips, the adhesives can be carbonized at high temperature, the high-temperature materials are easy to scatter from the surface of the copper bar, and the insulation performance can still not be guaranteed. How to maintain the insulating capability of the copper bar at high temperature is the problem mainly solved by the invention.

Therefore, there is a need to develop a new high-temperature-resistant insulated copper busbar structure, a power battery and a vehicle.

Disclosure of Invention

An object of the utility model is to provide a high temperature resistant insulation copper bar structure, power battery and vehicle also can keep the insulating ability of copper bar under high temperature.

The utility model discloses a high temperature resistant insulating copper bar structure, which comprises a copper bar body and connecting parts arranged at two ends of the copper bar body, wherein a first high temperature resistant insulator and a second high temperature resistant insulator are arranged outside the copper bar body along the length direction of the copper bar body in a staggered manner;

the first high-temperature-resistant insulator is sequentially provided with a Teflon layer, a tin foil layer and a PVC layer from inside to outside;

the second high-temperature-resistant insulator is sequentially provided with a Teflon layer and a PVC layer from inside to outside.

Optionally, the length scope of every first high temperature resistant insulator is 20mm ~ 30mm, has electric conductive property because of the tinfoil layer, sets up the length of first high temperature resistant insulator between 20mm ~ 30mm to increase and soak and mould the adsorptivity, make PVC liquid can attach to the copper bar on the surface, can also reduce the risk that copper bar and metalwork switched on simultaneously.

Optionally, the length range of each second high-temperature-resistant insulator is 50 mm-80 mm, so that the risk of conduction between the copper bar and the metal piece can be reduced.

Optionally, the copper bar body includes the copper core, and the surface of copper core is equipped with electroplates dumb nickel layer, can effectively prevent the copper diffusion.

Optionally, the thickness of the electroplated matte nickel layer is more than 6 μm, so that the requirements on electric conduction and contact resistance can be met.

Optionally, the Teflon layer is wound on the copper bar by adopting a Teflon adhesive tape, and the process is simple.

Optionally, the teflon adhesive tape is lapped and wound on the copper bar by an overlapping amount larger than one half, can completely cover the outer surface of the copper bar body, and has a good insulation effect.

Optionally, the tin foil layer is made of tin foil paper, and the tin foil paper is wound on the outer surface of the Teflon adhesive tape, so that the process is simple.

In a second aspect, a power battery, adopt like the utility model discloses a high temperature resistant insulation copper bar structure.

The third aspect, the utility model discloses a vehicle, adopt like the utility model discloses a power battery.

The utility model has the advantages of it is following: the utility model arranges a first high temperature resistant insulator and a second high temperature resistant insulator outside the copper bar body, wherein the first high temperature resistant insulator is a Teflon layer, a tin foil layer and a PVC layer from inside to outside in sequence; the second high temperature resistant insulator is Teflon layer and PVC layer from inside to outside in proper order, so have better high temperature resistant insulating properties, even also can keep the insulating ability of copper bar under high temperature to the risk of short circuit appears when having effectively prevented power battery from taking place thermal runaway.

Drawings

Fig. 1 is a schematic structural view illustrating a fixing structure of a copper bar and a battery module in the present embodiment.

Fig. 2 is a schematic structural view of the copper bar body in the embodiment.

Fig. 3 is a schematic structural view of the copper bar wound with the teflon tape in this embodiment.

Fig. 4 is a schematic view of the structure of the copper bar wrapped with the tin foil paper in this embodiment.

Fig. 5 is a perspective view of the structure of the copper bar after plastic dipping in the embodiment.

Fig. 6 isbase:Sub>A sectional view taken along linebase:Sub>A-base:Sub>A of fig. 5.

Fig. 7 is a sectional view taken along line B-B in fig. 5.

In the figure: 1. the battery module, 2, the insulating cap, 3, the copper bar assembly, 4, hexagonal flange face bolt, 5, copper bar body, 6, teflon layer, 7, tin foil layer, 8, PVC layer.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 to 7, in the present embodiment, a high temperature resistant insulated copper bar structure includes a copper bar body 5 and connecting portions disposed at two ends of the copper bar body 5, wherein first high temperature resistant insulators and second high temperature resistant insulators are disposed outside the copper bar body 5 along a length direction thereof in a staggered manner; the first high-temperature-resistant insulator comprises a Teflon layer 6, a tin foil layer 7 and a PVC layer 8 from inside to outside in sequence; the second high-temperature-resistant insulator is sequentially provided with a Teflon layer 6 and a PVC layer 8 from inside to outside.

In this embodiment, as shown in fig. 1, the high-temperature-resistant insulating copper bar structure is used to connect two battery modules 1, and is fixed to the positive and negative electrodes of the two battery modules 1 by two hexagonal flange face bolts 4, and the mounting point region (i.e., the connection portion) is fixed and protected by an insulating cap 2. The periphery of the high-temperature-resistant insulating copper bar structure is provided with metal pieces such as a box body cross beam, the minimum gap is not more than 10mm, and the risk of short circuit and fire caused by the battery when the battery core in the battery module 1 is sprayed is effectively reduced by the first high-temperature-resistant insulator and the second high-temperature-resistant insulator outside the copper bar body 5.

As shown in figure 2, copper bar body 5 includes the copper core, and the surface of copper core is equipped with electroplates dumb nickel layer, and the copper core chooses for use T2Y2 raw and other materials to make, and technology adopts integral type stamping structure, and based on operating condition's maximum continuous current requirement, for guaranteeing that the copper bar temperature rise is in certain extent, the sectional area of copper core is 15mm 3mm, and the surface is equipped with and electroplates dumb nickel layer, and for satisfying electrically conductive requirement and contact resistance requirement, the thickness of electroplating dumb nickel layer is greater than 6 μm.

As shown in fig. 3, the teflon layer 6 is wound on the copper bar by using a teflon adhesive tape. In this embodiment, the electroplated copper bar body 5 is wound up from the end with 25mm wide teflon adhesive tape to be greater than half of the overlap amount overlap joint winding on the copper bar, and the teflon adhesive tape should closely bond with the copper bar, must not have obvious clearance, fold, and the department of bending must not have the arch, utilizes the sheetmetal to flatten the teflon adhesive tape at last. In addition, the linear copper bar body 5 can be wound by an automatic winding machine, so that the process efficiency is improved.

As shown in fig. 4, the baking temperature of the plastic-impregnated PVC8 process can reach 200 ℃, and due to the characteristic that the outer surface of the teflon adhesive tape is not easy to adsorb PVC, the defective rate of cracking of the PVC layer 8 of the copper bar is high at high temperature, and therefore, the outer surface of the teflon layer 6 needs to be wound with tinfoil paper, so that PVC liquid can be attached to the surface of the copper bar. But the surface of tin foil paper has conductive property, and in order to reduce the risk that copper bar and metalwork switched on, the tin foil paper needs the local fixation on the surface of teflon layer 6, and partly outside teflon layer 6 sets up tin foil layer 7 promptly, and partly does not set up tin foil layer 7.

In this embodiment, the length of setting up first high temperature resistant insulator is comparatively suitable for 20mm ~ 30mm, and the length of setting up the second high temperature resistant insulator is comparatively suitable for 50mm ~ 80mm, and this kind of mode of setting can effectively reduce the risk that copper bar and metalwork switched on.

Add man-hour, at first twine the outer surface of copper bar body 5 with the teflon sticky tape, the surface at the teflon sticky tape is fixed to the part of rethread tin foil paper to increase and soak and mould the adsorptivity, adhere to the surface at tin foil paper and teflon sticky tape with PVC through soaking the technology of moulding at last, form PVC layer 8.

The back adhesive of the Teflon adhesive tape can be carbonized at high temperature, so that the Teflon adhesive tape cannot be completely fixed only by the tin foil paper, and the risk of looseness exists. For this purpose, PVC is also impregnated to form a PVC layer 8; the appearance of the PVC layer 8 is smooth and bright, and besides the basic insulating property, the PVC layer 8 also has the function of fastening the Teflon adhesive tape even if the gum of the Teflon adhesive tape is carbonized at high temperature, so that the insulating property of the Teflon adhesive tape is ensured.

In this embodiment, a power battery adopts the high temperature resistant insulated copper bar structure as described in this embodiment.

In the present embodiment, a vehicle employs the power battery as described in the present embodiment.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.

Claims (10)

1. The utility model provides a high temperature resistant insulation copper bar structure, includes copper bar body (5) and sets up the connecting portion at copper bar body (5) both ends, its characterized in that: the copper bar body (5) is provided with a first high-temperature-resistant insulator and a second high-temperature-resistant insulator in a staggered manner along the length direction;

the first high-temperature-resistant insulator is sequentially provided with a Teflon layer (6), a tin foil layer (7) and a PVC layer (8) from inside to outside;

the second high-temperature-resistant insulator is sequentially provided with a Teflon layer (6) and a PVC layer (8) from inside to outside.

2. The high-temperature-resistant insulated copper bar structure according to claim 1, wherein: the length of each first high-temperature-resistant insulator ranges from 20mm to 30mm.

3. The high-temperature-resistant insulated copper bar structure according to claim 1 or 2, wherein: the length of each second high-temperature-resistant insulator ranges from 50mm to 80mm.

4. The high-temperature-resistant insulated copper bar structure according to claim 3, wherein: the copper bar body (5) comprises a copper core, and an electroplating matte nickel layer is arranged on the outer surface of the copper core.

5. The high-temperature-resistant insulated copper bar structure according to claim 4, wherein: the thickness of the electroplating dummy nickel layer is more than 6 μm.

6. The high temperature resistant insulated copper bar structure of claim 1, 2, 4 or 5, wherein: the Teflon layer (6) is wound on the copper bar by adopting a Teflon adhesive tape.

7. The high-temperature-resistant insulated copper bar structure according to claim 6, wherein: the Teflon adhesive tape is lapped and wound on the copper bar by more than one half of the overlapping amount.

8. The high temperature resistant insulated copper busbar structure according to claim 1, 2, 4, 5 or 7, wherein: the tin foil layer (7) is made of tin foil paper, and the tin foil paper is wound on the outer surface of the Teflon adhesive tape.

9. A power battery, characterized by: the high-temperature resistant insulated copper busbar structure as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: the power battery of claim 9 is used.

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