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CN-224217497-U - Battery core and electric equipment

CN224217497UCN 224217497 UCN224217497 UCN 224217497UCN-224217497-U

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell and electric equipment. The battery cell comprises a battery cell shell, a battery cell assembly and a flame-retardant sheet, wherein the battery cell shell is provided with a containing cavity, the battery cell assembly is arranged in the containing cavity, the flame-retardant sheet is arranged in the containing cavity and comprises a main body and a flame retardant, a plurality of hollow vesicles are arranged in the main body, the flame retardant is filled in at least part of the vesicles, and the main body can release the flame retardant in the vesicles when being melted. The flame retardant sheet is provided with a closed vesicle, the flame retardant is directly filled in the vesicle, when the battery core is in thermal runaway, the flame retardant sheet is heated and melted, so that the structure of the vesicle is damaged, the internal flame retardant is directly released, the flame retardant can be inserted into the thermal runaway process of the battery core, and the development of thermal runaway can be restrained at the early stage of the thermal runaway.

Inventors

  • WANG WEIWEI

Assignees

  • 华南理工大学

Dates

Publication Date
20260508
Application Date
20250716

Claims (10)

  1. 1. A kind of electric core, characterized by comprising the following steps: the battery cell shell (2) is provided with an accommodating cavity; the battery cell assembly (3) is arranged in the accommodating cavity; The flame retardant sheet (1) is arranged in the accommodating cavity and comprises a main body (101) and a flame retardant (102), wherein a plurality of closed vesicles (104) are arranged in the main body (101), the flame retardant (102) is filled in at least part of the vesicles (104), and the main body (101) can release the flame retardant (102) in the vesicles (104) when being melted.
  2. 2. The cell according to claim 1, wherein the flame retardant sheet (1) further comprises a flame retardant gas filled in at least part of the vesicles (104).
  3. 3. The cell of claim 1, wherein the flame retardant sheet (1) further comprises an interlayer (103), the interlayer (103) being disposed inside the main body (101), and the material of the interlayer (103) comprises an inorganic nonmetallic material.
  4. 4. A cell according to claim 3, wherein the interlayer (103) has a thickness direction (Z), the interlayer (103) is provided with a connection hole (1031) penetrating in the thickness direction (Z), and a portion of the main body (101) is filled in the connection hole (1031).
  5. 5. The cell of claim 4, wherein the number of connection holes (1031) is plural, and the plural connection holes (1031) are arranged at intervals along the edge of the interlayer (103).
  6. 6. The cell of claim 3, wherein the inorganic nonmetallic material comprises any one of fiberglass, mica flakes, ceramic aerogel.
  7. 7. A cell according to claim 3, characterized in that the interlayer (103) has a length direction (X) in which the length of the interlayer (103) is 50 to 90% of the length of the body (101) and a width direction (Y) in which the width of the interlayer (103) is 50 to 90% of the width of the body (101).
  8. 8. The cell according to claim 1, characterized in that the flame retardant sheet (1) is in contact with at least two surfaces of the cell assembly (3).
  9. 9. The cell according to claim 1, characterized in that the flame retardant sheet (1) is arranged in the center of the cell assembly (3).
  10. 10. An electrical device comprising a cell according to any one of claims 1 to 9 as a power supply for the electrical device.

Description

Battery core and electric equipment Technical Field The utility model relates to the technical field of batteries, in particular to a battery cell and electric equipment. Background The battery core may have thermal runaway due to extrusion, collision and other reasons in the use process, so that dangerous situations such as overheating, firing and even explosion are caused, and life and property safety of users are seriously threatened. For this reason, it is necessary to suppress the thermal runaway process of the battery cells by the flame retardant. In some related technologies, the flame retardant is filled in the microcapsule and mixed with the electrolyte, and in normal use, the flame retardant does not contact with the electrolyte, and in thermal runaway of the battery cell, the electrolyte is heated to raise temperature, and heat is conducted to the microcapsule, so that the microcapsule breaks to release the internal flame retardant, and further development of the thermal runaway is inhibited. However, the incorporation of other substances into the electrolyte affects the electrical properties of the electrolyte, and the temperature required for the microcapsule to rupture is relatively high, thereby resulting in a delay in the release time of the flame retardant, which makes it difficult to suppress the development of thermal runaway in the early stage of thermal runaway. Disclosure of utility model In view of the above, the utility model provides a battery cell and electric equipment to solve the problems that the electric performance is affected by the flame retardant and the release time of the flame retardant is delayed. In a first aspect, the utility model provides a battery cell, which comprises a battery cell shell, a battery cell assembly and a flame retardant sheet, wherein the battery cell shell is provided with a containing cavity, the battery cell assembly is arranged in the containing cavity, the flame retardant sheet is arranged in the containing cavity and comprises a main body and a flame retardant, a plurality of hollow vesicles are arranged in the main body, the flame retardant is filled in at least part of the vesicles, and the main body can release the flame retardant in the vesicles when being melted. The flame retardant has the advantages that on one hand, the flame retardant is stored in the flame retardant sheet, so that the electrolyte of the battery cell is prevented from being doped with other substances, the influence of the flame retardant on the electrical property of the battery cell is reduced, on the other hand, the flame retardant sheet is provided with the closed vesicle, the flame retardant is directly filled in the vesicle, when the battery cell is in thermal runaway, the flame retardant sheet is heated and melted, the structure of the vesicle is damaged, and the internal flame retardant is directly released into the electrolyte, so that the link of waiting for microcapsule rupture is omitted, the flame retardant can be introduced into the thermal runaway process of the battery cell earlier, and the development of the thermal runaway is restrained at the early stage of the thermal runaway. In an alternative embodiment, the flame retardant sheet further comprises a flame retardant gas filled in at least part of the vesicles. In an alternative embodiment, the flame retardant sheet further comprises an interlayer, the interlayer is disposed inside the main body, and the interlayer comprises an inorganic nonmetallic material. In an alternative embodiment, the interlayer has a thickness direction, the interlayer is provided with a connection hole penetrating in the thickness direction, and a portion of the body is filled in the connection hole. In an alternative embodiment, the number of the connection holes is plural, and the plural connection holes are arranged at intervals along the edge of the interlayer. In an alternative embodiment, the inorganic nonmetallic material includes any one of fiberglass, mica flakes, ceramic aerogel. In an alternative embodiment, the interlayer has a length direction in which the length of the interlayer is 50% to 90% of the length of the body and a width direction in which the width of the interlayer is 50% to 90% of the width of the body. In an alternative embodiment, the flame retardant sheet is in contact with at least two surfaces of the cell assembly. In an alternative embodiment, the flame retardant sheet is disposed in the center of the cell assembly. In a second aspect, the utility model further provides electric equipment, which comprises the battery cell provided by the utility model, wherein the battery cell is used as a power supply of the electric equipment. The electric equipment comprises the electric core provided by the utility model, so that the electric core has the beneficial effects, and the description is omitted. Drawings In order to more clearly illustrate the embodiments of the present utility model or the