High-temperature insulating protective sleeve, high-voltage connecting piece and power battery

Abstract

The utility model relates to the technical field of power batteries, in particular to a high-temperature insulating protective sleeve, a high-voltage connecting piece and a power battery. The high-temperature insulation protective sleeve comprises a braid layer and a first ceramic silicone rubber layer, the braid layer is arranged on the periphery of the copper bar in a sleeving mode, the first ceramic silicone rubber layer is arranged on the periphery of the braid layer in a sleeving mode, the braid layer comprises glass fibers, basalt fibers and carbon fibers, the glass fibers, the basalt fibers and the carbon fibers are integrally formed, and the braid layer has elasticity. Compared with the prior art, the braid layer has high flexibility, and the first ceramic silicone rubber layer has elasticity, so that the copper bar can be sleeved with the braid layer conveniently, and the working efficiency is improved; the braid layer also has high wear resistance, so that wear and scratch can be prevented; the first ceramic silicone rubber layer can be converted into a ceramic structure, has excellent thermal protection and high-temperature insulation functions, can prevent insulation failure caused by overheating of the high-voltage connecting piece, avoids detonation caused by thermal runaway of the power battery, and ensures the reliability and safety of the power battery.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a high-temperature insulating protective sleeve, a high-voltage connector and a power battery. Background Art

[0002] A power battery is an energy storage device used to power electric vehicles, hybrid electric vehicles, and other vehicles. It primarily consists of battery cells, battery packs, and a battery management system (BMS). A battery pack typically consists of several battery cells connected in series or parallel, assembled into a module with a specific capacity and voltage level to form a single unit capable of providing the high power and long-term drive required by the vehicle. The high-voltage connectors of a power battery are a crucial component for connecting battery modules and between them and the battery management system, ensuring the reliability and safety of the electrical connections between the modules.

[0003] Since a large proportion of electric vehicle fires are caused by electrical fires, high-voltage connectors short-circuit and arc at high temperatures, which can promote thermal runaway of the power battery, causing deflagration or even explosion, posing a great threat to human life and property safety. Therefore, high-voltage connectors are usually insulated.

[0004] The high-voltage connectors in the prior art are insulated in the form of wrapping tape. Due to the limitations of the structure and materials of the wrapping tape, the following disadvantages occur: the wrapping process is inefficient and the processing cost is high; the wrapping tape is easily broken during the wrapping process, and a good insulation effect cannot be achieved; there are gaps between the wrapping tape layers, which is prone to high-temperature insulation failure; the overlap between the wrapping tape layers is prone to slippage, affecting the overall aesthetics and insulation effect of the product; the wrapping tape has double-sided tape on the back, has poor flame retardant properties, and poses certain safety hazards; the wrapping tape is prone to brittle cracking and failure at high temperatures; the mica tape is prone to powdering during use, affecting insulation and reducing the safety and reliability of the battery module.

[0005] Therefore, there is an urgent need for a high-temperature insulating protective cover, a high-voltage connector and a power battery to solve the above technical problems. Utility Model Content

[0006] The purpose of the present utility model is to provide a high-temperature insulating protective sleeve, a high-voltage connector and a power battery, which can prevent the high-voltage connector from overheating and causing the insulation layer of the high-voltage connector to fail, avoid thermal runaway of the power battery and cause explosion, ensure the reliability and safety of the power battery, and at the same time be easy to use and improve work efficiency.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] A high-temperature insulating protective sleeve includes: a braided layer and a first ceramic silicone rubber layer. The braided layer is sleeved on the outer periphery of a copper busbar, and the first ceramic silicone rubber layer is sleeved on the outer periphery of the braided layer. The braided layer is made of glass fiber, basalt fiber and carbon fiber interwoven and elastic.

[0009] As a preferred technical solution of the above-mentioned high-temperature insulating protective sleeve, the high-temperature insulating protective sleeve further includes a second ceramic silicone rubber layer, and the second ceramic silicone rubber layer is arranged between the braided layer and the copper busbar.

[0010] As a preferred technical solution of the above-mentioned high-temperature insulating protective sleeve, the thickness of the braided layer is d1, 0.05mm≤d1≤2mm.

[0011] As a preferred technical solution of the above-mentioned high-temperature insulating protective sleeve, the thickness d2 of the first ceramic silicone rubber layer is 0.02mm≤d2≤2mm.

[0012] As an optimal technical solution of the above-mentioned high-temperature insulating protective sleeve, the high-temperature insulating protective sleeve further includes a cable tie, which is wrapped around the outer periphery of the first ceramic silicone rubber layer and is used to fix the first ceramic silicone rubber layer, the braided layer and the copper busbar.

[0013] As a preferred technical solution of the above-mentioned high-temperature insulating protective sleeve, the high-temperature insulating protective sleeve further includes a tape, wherein a portion of the tape is adhered to the first ceramic silicone rubber layer, and another portion of the tape is adhered to the copper busbar.

[0014] A high-voltage connector includes a copper busbar, the high-voltage connector also including a first connecting portion, a second connecting portion, and a high-temperature insulating protective sleeve according to any of the above-mentioned preferred technical solutions, the high-temperature insulating protective sleeve being sleeved on the copper busbar, the first connecting portion and the second connecting portion being respectively connected to the two ends of the copper busbar, and the first connecting portion and the second connecting portion being both exposed outside the high-temperature insulating protective sleeve.

[0015] As a preferred technical solution of the above-mentioned high-voltage connector, the first connecting part, the second connecting part and the copper busbar are integrated.

[0016] A power battery includes several battery modules. The power battery also includes several high-voltage connectors in the above-mentioned preferred technical solution, and the first connecting part and the second connecting part are respectively connected to two adjacent battery modules.

[0017] Beneficial effects of the utility model:

[0018] The utility model provides a high-temperature insulating protective sleeve. The high-temperature insulating protective sleeve includes: a braided layer and a first ceramic silicone rubber layer. The braided layer is sleeved on the outer periphery of the copper busbar, and the first ceramic silicone rubber layer is sleeved on the outer periphery of the braided layer. The braided layer is woven by interlacing glass fiber, basalt fiber and carbon fiber, and the braided layer is elastic. Compared with the existing technology, the braided layer woven by interlacing glass fiber, basalt fiber and carbon fiber has high flexibility, and the first ceramic silicone rubber layer is elastic, which is convenient for sleeved on the copper busbar and improves work efficiency; the braided layer woven by interlacing glass fiber, basalt fiber and carbon fiber also has high wear resistance, which can prevent the high-temperature insulating protective sleeve from wear and scratching; the first ceramic silicone rubber layer will be transformed into a ceramic structure in high temperature or flame, and has excellent thermal protection and high-temperature insulation functions, which can prevent the high-voltage connector from overheating and causing insulation failure, avoid thermal runaway of the power battery and cause explosion, and ensure the reliability and safety of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0020] Figure 1 A cross-sectional view of the structure of a high-voltage connector provided by an embodiment of the present utility model;

[0021] Figure 2 Schematic diagram of the structure of the high-voltage connector provided in the embodiment of the utility model Figure 1 ;

[0022] Figure 3 Schematic diagram of the structure of the high-voltage connector provided in the embodiment of the utility model Figure 2 .

[0023] In the picture:

[0024] 1. Braided layer; 2. First ceramic silicone rubber layer; 3. Copper busbar; 4. Second ceramic silicone rubber layer; 5. Cable tie; 6. Adhesive tape; 7. First connecting part; 8. Second connecting part; 9. Mounting hole. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0026] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0027] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0028] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0029] like Figure 1As shown, the present invention provides a high-temperature insulating protective sleeve. The high-temperature insulating protective sleeve includes: a braided layer 1 and a first ceramic silicone rubber layer 2. The braided layer 1 is sleeved around the outer periphery of the copper busbar 3, and the first ceramic silicone rubber layer 2 is sleeved around the outer periphery of the braided layer 1. The braided layer 1 includes glass fiber, basalt fiber, and carbon fiber. The glass fiber, basalt fiber, and carbon fiber are integrally molded and the braided layer 1 is elastic. Compared to existing technologies, the braided layer 1, integrally formed from glass fiber, basalt fiber, and carbon fiber, exhibits high flexibility, while the first ceramic silicone rubber layer 2 exhibits elasticity, facilitating its placement on the copper busbar 3 and improving operational efficiency. The braided layer 1, integrally formed from glass fiber, basalt fiber, and carbon fiber, also exhibits high wear resistance, preventing wear and scratching of the high-temperature insulating sleeve. The first ceramic silicone rubber layer 2 transforms into a ceramic structure when exposed to high temperatures or flames, ensuring structural integrity. The superior thermal protection and high-temperature insulation properties prevent insulation failure caused by overheating of high-voltage connectors, and avoid deflagration caused by thermal runaway of the power battery, thereby ensuring the reliability and safety of the power battery. Furthermore, the high-temperature insulating sleeve is resistant to electrolyte corrosion, maintaining excellent fire resistance and high-temperature electrical insulation properties even after the battery pack experiences thermal runaway and is sprayed with high-temperature electrolyte, thus preventing accidents. It should be noted that the high-temperature insulating sleeve meets the UL94V-0 flame retardant standard, effectively preventing the spread of flames to other areas.

[0030] Furthermore, the braided layer 1 is made of glass fiber, basalt fiber and carbon fiber interwoven, which can improve the mechanical properties of the braided layer 1 and increase the firmness of the braided layer 1. The braided layer 1 and the first ceramic silicone rubber layer 2 are integrally molded, thereby greatly improving the mechanical properties of the first ceramic silicone rubber layer 2, so that the high-temperature insulating sheath has excellent mechanical strength and improves the service life of the high-temperature insulating protective sheath.

[0031] Optionally, the high-temperature insulating protective cover further includes a second ceramic silicone rubber layer 4, which is arranged between the braided layer 1 and the copper busbar 3. The second ceramic silicone rubber layer 4 is sleeved on the outer periphery of the copper busbar 3. When the temperature of the copper busbar 3 is too high, the second ceramic silicone rubber layer 4 can be converted into a ceramic structure, which has the functions of heat resistance, high temperature resistance and insulation, can withstand high temperatures above 1300°C, and can prevent the high-temperature insulating protective cover from failing.

[0032] Optionally, the first ceramic silicone rubber layer 2, the braided layer 1 and the second ceramic silicone rubber layer 4 are integrally formed, which is convenient for production and processing, and convenient for putting the high-temperature insulating protective sleeve on the copper busbar 3. The high-temperature insulating protective sleeve is flexible and can be applied to copper buses 3 of different specifications, ensuring that the high-temperature insulating protective sleeve fits tightly to the copper busbar 3, thereby improving the versatility of the high-temperature insulating protective sleeve.

[0033] Optionally, the thickness of the braided layer 1 is d1, 0.05mm≤d1≤2mm, the thickness of the first ceramic silicone rubber layer 2 is d2, 0.02mm≤d2≤2mm, and the thickness of the second ceramic silicone rubber layer 4 is d3, 0.02mm≤d3≤2mm. The glass fiber, basalt fiber and carbon fiber themselves have low density and light weight, so that the weight of the braided layer 1 is relatively light. The thickness of the braided layer 1 is controlled within the range of 0.05mm-2mm, the thickness of the first ceramic silicone rubber layer 2 is controlled within the range of 0.02mm-2mm, and the thickness of the second ceramic silicone rubber layer 4 is controlled within the range of 0.02mm-2mm. This can ensure that the high-temperature insulating protective cover has high mechanical strength while achieving lightweighting of the high-temperature insulating protective cover, thereby achieving lightweighting of the power battery.

[0034] Alternatively, as Figure 2 As shown, the high-temperature insulating protective sleeve also includes a cable tie 5, which is wrapped around the outer periphery of the first ceramic silicone rubber layer 2. The cable tie 5 is used to fix the first ceramic silicone rubber layer 2, the braided layer 1 and the copper bus 3. This arrangement can prevent the overall structure of the first ceramic silicone rubber layer 2, the braided layer 1 and the second ceramic silicone rubber layer 4 from moving relative to the copper bus 3, thereby avoiding affecting the insulation effect.

[0035] Furthermore, the high-temperature insulating protective cover also includes a buckle and a hook. The copper busbar 3 is in the shape of a long strip. The buckle and the hook are arranged at intervals on the outer surface of the first ceramic silicone rubber layer 2, and the buckle and the hook are respectively located on the front and back sides of the copper busbar 3. By snapping the buckle and the hook, the overall structure of the first ceramic silicone rubber layer 2, the braided layer 1 and the second ceramic silicone rubber layer 4 can be fixedly connected to the copper busbar 3, preventing the overall structure of the first ceramic silicone rubber layer 2, the braided layer 1 and the second ceramic silicone rubber layer 4 from moving relative to the copper busbar 3, thereby avoiding affecting the insulation effect.

[0036] Alternatively, as Figure 3 As shown, the high-temperature insulating protective sleeve also includes tape 6. The length of the copper busbar 3 is greater than the length of the overall structure of the first ceramic silicone rubber layer 2, the braided layer 1, and the second ceramic silicone rubber layer 4. A portion of the tape 6 is adhered to the first ceramic silicone rubber layer 2, and another portion of the tape 6 is adhered to the copper busbar 3. This arrangement can prevent the overall structure of the first ceramic silicone rubber layer 2, the braided layer 1, and the second ceramic silicone rubber layer 4 from moving relative to the copper busbar 3, thereby avoiding affecting the insulation effect. Furthermore, the tape 6 is PI tape or electrical tape, which is high-temperature resistant to prevent the tape 6 from burning.

[0037] The present utility model also provides a high-voltage connector, including a copper busbar 3, the high-voltage connector also including a first connecting portion 7, a second connecting portion 8 and a high-temperature insulating protective sleeve in any of the above embodiments, the high-temperature insulating protective sleeve is sleeved on the copper busbar 3, the first connecting portion 7 and the second connecting portion 8 are respectively connected to the two ends of the copper busbar 3, and the first connecting portion 7 and the second connecting portion 8 are both exposed from the high-temperature insulating protective sleeve, and the first connecting portion 7 and the second connecting portion 8 are used to connect two adjacent battery modules.

[0038] Optionally, the first connecting part 7, the second connecting part 8 and the copper busbar 3 are integrated to improve the connection strength between the first connecting part 7, the second connecting part 8 and the copper busbar 3 and prevent the copper busbar 3 from separating from the first connecting part 7 and / or the second connecting part 8.

[0039] Optionally, both the first connecting portion 7 and the second connecting portion 8 are provided with mounting holes 9 for connecting the positive electrode or the negative electrode of the battery module.

[0040] The present invention also provides a power battery, including several battery modules. The power battery also includes several high-voltage connectors in the above embodiments, and the first connecting portion 7 and the second connecting portion 8 are respectively connected to two adjacent battery modules.

[0041] Furthermore, the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A high temperature insulating protective cover, characterized in that: include: A braided layer (1) and a first ceramic silicone rubber layer (2), wherein the braided layer (1) is sleeved on the outer periphery of the copper busbar (3), and the first ceramic silicone rubber layer (2) is sleeved on the outer periphery of the braided layer (1), and the braided layer (1) is formed by interlacing and weaving glass fiber, basalt fiber and carbon fiber, and the braided layer (1) has elasticity.

2. The high temperature insulation protective cover according to claim 1, characterized in that: The high-temperature insulating protective sleeve further comprises a second ceramic silicone rubber layer (4), and the second ceramic silicone rubber layer (4) is arranged between the braided layer (1) and the copper busbar (3).

3. The high temperature insulation protective cover according to claim 1, characterized in that: The thickness of the braided layer (1) is d1, 0.05 mm ≤ d1 ≤ 2 mm.

4. The high temperature insulation protective cover according to claim 1, characterized in that: The thickness of the first ceramic silicone rubber layer (2) is d2, 0.02 mm≤d2≤2 mm.

5. The high temperature insulation protective cover according to claim 1, characterized in that: The high-temperature insulating protective sleeve further comprises a cable tie (5), wherein the cable tie (5) is wound around the outer periphery of the first ceramic silicone rubber layer (2), and the cable tie (5) is used to fix the first ceramic silicone rubber layer (2), the braided layer (1) and the copper busbar (3).

6. The high temperature insulation protective cover according to claim 1, characterized in that: The high-temperature insulating protective sleeve further comprises an adhesive tape (6), wherein a portion of the adhesive tape (6) is adhered to the first ceramic silicone rubber layer (2), and another portion of the adhesive tape (6) is adhered to the copper busbar (3).

7. A high voltage connector, comprising a copper busbar (3), characterized in that: The high-voltage connector further comprises a first connecting portion (7), a second connecting portion (8) and a high-temperature insulating protective sleeve according to any one of claims 1 to 6, wherein the high-temperature insulating protective sleeve is sleeved on the copper busbar (3), the first connecting portion (7) and the second connecting portion (8) are respectively connected to the two ends of the copper busbar (3), and the first connecting portion (7) and the second connecting portion (8) are both exposed outside the high-temperature insulating protective sleeve.

8. The high-voltage connector according to claim 7, characterized in that: The first connecting portion (7), the second connecting portion (8) and the copper busbar (3) are integrally arranged.

9. A power battery comprising a plurality of battery modules, characterized in that: The power battery further comprises a plurality of high-voltage connectors as claimed in any one of claims 7 to 8, wherein the first connecting portion (7) and the second connecting portion (8) are respectively connected to two adjacent battery modules.

Images