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CN-224232868-U - Temperature-sensitive explosion-proof packaging component and energy storage device

CN224232868UCN 224232868 UCN224232868 UCN 224232868UCN-224232868-U

Abstract

The utility model discloses a temperature-sensitive explosion-proof packaging component and an energy storage device. The temperature-sensitive explosion-proof packaging component comprises a top cover plate and an explosion-proof device, wherein the top cover plate is used for attaching and sealing a battery, explosion-proof holes are formed in the top cover plate, the explosion-proof device comprises an explosion-proof plate prepared from temperature-sensitive materials, the explosion-proof plate is connected to the top cover plate and seals the explosion-proof holes, and the explosion-proof plate can soften and release the explosion-proof holes at preset temperature. According to the utility model, the explosion-proof piece prepared by the temperature-sensitive material is arranged, so that the battery with overlarge heat generated in the battery can be accurately judged, the explosion-proof piece can be softened at a preset temperature, the softened explosion-proof piece can release the explosion-proof hole, a large amount of accumulated gas generated in the battery can be timely discharged after the explosion-proof valve is broken, the potential safety hazard of the battery is eliminated, and the explosion of the battery is avoided, so that the safety performance of the battery is improved. Meanwhile, compared with the traditional technology, the explosion-proof valve can be prevented from being broken due to normal gas production in the battery, and unnecessary loss is reduced.

Inventors

  • Liu Naxing

Assignees

  • 跃动新能源科技(浙江)有限公司

Dates

Publication Date
20260512
Application Date
20250416

Claims (10)

  1. 1. The temperature-sensitive explosion-proof packaging component (10) is characterized by comprising a top cover plate (100) and an explosion-proof device (200), wherein the top cover plate (100) is used for being attached to a sealed battery, explosion-proof holes (101) are formed in the top cover plate (100), the explosion-proof device (200) comprises explosion-proof plates (201) made of temperature-sensitive materials, the explosion-proof plates (201) are connected to the top cover plate (100) and seal the explosion-proof holes (101), the explosion-proof plates (201) can soften and release the explosion-proof holes (101) at preset temperature, limiting pieces (204) are arranged on the top cover plate (100), the limiting pieces (204) are of annular structures, the limiting pieces (204) are arranged around the periphery of the explosion-proof holes (101), or the number of the limiting pieces (204) is multiple, the limiting pieces (204) are distributed at intervals along the periphery of the explosion-proof holes (101), and the periphery of the explosion-proof plates (201) abuts against and is connected to the inner wall of the limiting pieces (204).
  2. 2. The temperature-sensitive explosion-proof packaging component (10) according to claim 1, wherein the top cover sheet (100) comprises an inner surface for conforming to a battery and an opposite outer surface, the explosion-proof sheet (201) being in proximity to the outer surface of the top cover sheet (100).
  3. 3. The temperature-sensitive explosion-proof packaging component (10) according to claim 1, wherein the temperature-sensitive explosion-proof packaging component (10) further satisfies at least one of the following conditions: (1) The thickness of the explosion-proof sheet (201) is 50-300 mu m; (2) The softening temperature of the explosion-proof sheet (201) is 100-300 ℃.
  4. 4. The temperature-sensitive explosion-proof packaging component (10) according to claim 1, wherein the temperature-sensitive explosion-proof packaging component (10) further satisfies at least one of the following conditions: (1) The preparation material of the explosion-proof sheet (201) is one or more selected from aluminum alloy, copper alloy and iron alloy; (2) The top cover sheet (100) is made of one or more materials selected from aluminum, copper and stainless steel; (3) The bursting disc (201) is connected to the top cover disc (100) in the form of a weld.
  5. 5. The temperature-sensitive explosion-proof packaging component (10) according to any one of claims 1-4, wherein the explosion-proof device (200) further comprises a Wen Mincai layer (202), the explosion-proof sheet (201) is connected with the top cover sheet (100) through the Wen Mincai layer (202), and the Wen Mincai layer (202) can be softened at a preset temperature to disconnect the explosion-proof sheet (201) from the top cover sheet (100).
  6. 6. The temperature-sensitive explosion-proof packaging component (10) according to claim 5, wherein the temperature-sensitive explosion-proof packaging component (10) further satisfies at least one of the following conditions: (1) The softening temperature of the Wen Mincai material layer (202) is 100-300 ℃; (2) The top cover sheet (100) is provided with an annular Wen Mincai material layer (202) along the peripheral edge of the explosion-proof hole (101).
  7. 7. The temperature-sensitive explosion-proof packaging component (10) according to any one of claims 1-4 and 6, wherein the explosion-proof device (200) further comprises a protective layer (203), the protective layer (203) is provided with a plurality of ventilation holes, the protective layer (203) is connected to the top cover sheet (100), the protective layer (203) covers at least one surface of the explosion-proof sheet (201) and has a gap with the explosion-proof sheet (201), or the protective layer (203) is connected with at least one surface of the explosion-proof sheet (201).
  8. 8. The temperature-sensitive explosion-proof packaging component (10) according to claim 7, wherein the temperature-sensitive explosion-proof packaging component (10) further satisfies at least one of the following conditions: (1) One side of the outer surface of the explosion-proof sheet (201) is provided with the protective layer (203); (2) The protective layer (203) entirely covers the outer surface of the rupture disc (201).
  9. 9. The temperature-sensitive explosion-proof packaging component (10) according to claim 7, wherein the preparation material of the protective layer (203) comprises one or more of nylon, polyethylene and polyethylene terephthalate.
  10. 10. An energy storage device is characterized by comprising a battery and the temperature-sensitive explosion-proof packaging component (10) according to any one of claims 1-9, wherein the surface of the battery is sealed by at least one temperature-sensitive explosion-proof packaging component (10) in a bonding manner.

Description

Temperature-sensitive explosion-proof packaging component and energy storage device Technical Field The application relates to the technical field of energy storage devices, in particular to a temperature-sensitive explosion-proof packaging component and an energy storage device. Background Lithium ion batteries have been receiving a great deal of attention because of their advantages such as high energy density, environmental friendliness, etc., and have been widely used in large-sized devices such as energy storage devices and electric vehicles. The safety of the lithium ion battery is the most important factor influencing the development of the lithium ion battery, such as the fact that the water content in the lithium ion battery exceeds standard, the SEI film is unstable, and the lithium ion battery is easy to produce gas, fire and even explode when being overcharged/overdischarged, short circuit, extrusion and other abuse conditions occur. At present, a common method for solving the problems is to add an explosion-proof valve on a top cover of a lithium ion battery, when the lithium ion battery generates gas, such as the gas pressure in the lithium ion battery reaches the explosion pressure of the explosion-proof valve, the explosion-proof plate on the top cover breaks, so that the gas in the lithium ion battery is discharged from a valve port of the explosion-proof valve, and explosion of the lithium ion battery caused by expanding gas is prevented. However, the adoption of the scheme also has a certain problem, because the lithium ion battery can generate some gases under the normal use condition, the situation that whether the potential safety hazard exists in the lithium ion battery is judged by only using the internal gas pressure of the lithium ion battery or not can be misjudged, the explosion-proof valve is broken in the normal use lithium ion battery, and the whole lithium ion battery is scrapped, so that unnecessary loss is caused. Disclosure of utility model Based on this, it is necessary to provide a temperature-sensitive explosion-proof package. The temperature-sensitive explosion-proof packaging component can accurately judge the battery with overlarge heat generated in the battery, break the explosion-proof valve and timely remove the gas generated in the battery, eliminate potential safety hazards and improve the safety performance of the battery. The embodiment of the application provides a temperature-sensitive explosion-proof packaging component. A temperature-sensitive explosion-proof packaging part comprises a top cover plate and an explosion-proof device, wherein the top cover plate is used for being attached to a sealed battery, explosion-proof holes are formed in the top cover plate, the explosion-proof device comprises explosion-proof pieces made of temperature-sensitive materials, the explosion-proof pieces are connected to the top cover plate and seal the explosion-proof holes, the explosion-proof pieces can soften and release the explosion-proof holes at preset temperature, limiting pieces are arranged on the top cover plate and are of annular structures, the limiting pieces are arranged around the periphery of the explosion-proof holes, or the limiting pieces are distributed at intervals along the periphery of the explosion-proof holes, and the periphery of the explosion-proof pieces are abutted to and connected to the inner wall of the limiting pieces. In some of these embodiments, the top cover sheet includes an inner surface for conforming to the battery and an opposite outer surface, and the burst disk is proximate to the outer surface of the top cover sheet. In some of these embodiments, the temperature-sensitive explosion-proof packaging component further satisfies at least one of the following conditions: (1) The thickness of the explosion-proof sheet is 50-300 mu m; (2) The softening temperature of the explosion-proof sheet is 100-300 ℃. In some of these embodiments, the temperature-sensitive explosion-proof packaging component further satisfies at least one of the following conditions: (1) The preparation material of the explosion-proof sheet is one or more selected from aluminum alloy, copper alloy and iron alloy; (2) The preparation material of the top cover sheet is one or more selected from aluminum, copper and stainless steel. In some of these embodiments, the rupture disc is attached to the cap disc in the form of a weld. In some embodiments, the explosion protection device further comprises a Wen Mincai layer, the explosion protection sheet is connected with the top cover sheet through the Wen Mincai layer, and the Wen Mincai layer can be softened at a preset temperature to separate the explosion protection sheet from the top cover sheet. In some of these embodiments, the temperature-sensitive explosion-proof packaging component further satisfies at least one of the following conditions: (1) The softening temperature of the Wen Mincai material layers is 100