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CN-122000535-A - Battery device and electric equipment with same

CN122000535ACN 122000535 ACN122000535 ACN 122000535ACN-122000535-A

Abstract

The invention discloses a battery device and electric equipment with the same, wherein the battery device comprises a shell, a battery pack and first heat absorbing pieces, the shell defines a containing cavity, the battery pack is arranged in the containing cavity and comprises a plurality of battery monomers which are arranged along a first direction, each battery monomer is provided with a tab leading-out piece, each battery monomer is provided with a first heat absorbing piece, and the first heat absorbing piece corresponding to each battery monomer extends to the tab leading-out piece to exchange heat with the tab leading-out piece. According to the battery device provided by the embodiment of the invention, each battery cell is provided with the first heat absorbing piece, the first heat absorbing piece can be used for blocking heat transfer between adjacent battery cells, absorbing heat on the tab leading-out piece, preventing the tab leading-out piece from further transferring the heat into the battery cells, further preventing the thermal runaway of the adjacent battery cells caused by high-temperature flame sprayed by the thermal runaway battery cells, delaying the heat diffusion speed of the battery cells, and facilitating the fight for more escape time for people.

Inventors

  • HUANG KAIXIN
  • JING MEI
  • GUO JINXIN
  • LIU ZEPENG
  • LEI SONG

Assignees

  • 比亚迪股份有限公司

Dates

Publication Date
20260508
Application Date
20251231

Claims (15)

  1. 1. A battery device, characterized by comprising: -a housing (10), the housing (10) defining a receiving cavity (101); the battery pack (20), the battery pack (20) is arranged in the accommodating cavity (101), the battery pack (20) comprises a plurality of battery cells (21) arranged along a first direction, and each battery cell (21) is provided with a tab leading-out piece (211); and the first heat absorbing members (40) are arranged on each battery cell (21), the first heat absorbing members (40) corresponding to each battery cell (21) extend to the tab leading-out sheet (211) so as to exchange heat with the tab leading-out sheet (211).
  2. 2. The battery device according to claim 1, wherein each of the battery cells (21) is provided with the first heat absorbing member (40) on both sides of the first direction.
  3. 3. The battery device according to claim 2, wherein two corresponding first heat absorbing members (40) of the battery cell (21) cooperate to define a placement cavity, the battery cell (21) is located in the placement cavity, the tab drawing piece (211) extends out of the placement cavity, and/or the tab drawing piece (211) is located at one side of the battery cell (21) in a second direction, a side of the battery cell (21) in the first direction is a side with the largest area, and the first heat absorbing member (40) covers at least part of a side of the battery cell (21) in the first direction, at least part of a side of the battery cell (21) in the second direction, and at least part of the tab drawing piece (211), the first direction and the second direction intersect.
  4. 4. A battery device according to any one of claims 1-3, characterized in that a separation chamber (102) is arranged between the battery pack (20) and the housing (10), a second heat absorbing member (50) is arranged in the separation chamber (102), and the second heat absorbing member (50) is arranged on at least one wall of the separation chamber (102).
  5. 5. The battery device according to claim 4, wherein the partition chamber (102) is located at one side of the battery pack (20) in a second direction, the first direction and the second direction being perpendicular, and the tab drawing piece (211) is located within the partition chamber (102).
  6. 6. The battery device according to claim 5, wherein, The shell (10) comprises a first boundary beam (11), a top cover (13) and a bottom plate (61), wherein the first boundary beam (11) is arranged at intervals with the battery pack (20) in the second direction, the top cover (13) and the bottom plate (61) are oppositely arranged in the third direction, the battery pack (20) is arranged between the bottom plate (61) and the top cover (13), the top cover (13) and the bottom plate (61) are respectively connected with the first boundary beam (11) to form a separation cavity (102) with the end part of the battery pack (20), and at least one of the bottom plate (61), the top cover (13) and the first boundary beam (11) is provided with a second heat absorbing piece (50), and the first direction, the second direction and the third direction are perpendicular to each other.
  7. 7. The battery device according to claim 6, wherein a flow passage is provided inside the bottom plate (61), the bottom plate (61) is in heat exchange with the battery pack (20), and the side of the bottom plate (61) facing the top cover (13) is provided with the second heat absorbing member (50); And/or the battery device further comprises a bottom guard plate (14), wherein the bottom guard plate (14) is arranged on one side of the bottom plate (61) away from the battery pack (20); and/or, the battery pack (20) comprises a plurality of electric connection pieces (221), the electric connection pieces (221) are electrically connected with a plurality of tab leading-out pieces (211), and the tab leading-out pieces (211) extend to one side, away from the battery cells (21), of the electric connection pieces (221) so as to be electrically connected with the electric connection pieces (221).
  8. 8. The battery device according to claim 6, characterized in that a flow passage is provided inside the bottom plate (61), the bottom plate (61) is in heat exchange with the battery pack (20), a second heat absorbing member (50) is provided on a side of the first side beam (11) facing the battery pack (20), the first side beam (11) is provided with a fitting hole (112), the second heat absorbing member (50) is provided with a relief hole (51), and the cooling joint (63) is adapted to be butted with the flow passage inside the bottom plate (61) through the fitting hole (112) and the relief hole (51).
  9. 9. The battery device of claim 4, wherein the first heat sink (40) comprises a first encapsulation film and a first heat sink material, the first encapsulation film encapsulating the first heat sink material, the second heat sink (50) comprises a second encapsulation film and a second heat sink material, the second encapsulation film encapsulating the second heat sink material, Wherein the first heat absorbing material comprises a hydrogel or an inorganic hydrated salt, and/or The second heat absorbing material comprises hydrogel or inorganic hydrated salt, and/or The first heat absorbing material satisfies , Heat absorption amount per unit area of the first heat absorbing material, In units of kJ/m 2 , The flame time for thermal runaway of the battery cells (21), and/or The second heat absorbing material satisfies , Heat absorption amount per unit area of the second heat absorbing material, In units of kJ/m 2 , And (3) the flame time for thermal runaway of the battery cell (21).
  10. 10. The battery device according to any one of claims 1 to 9, wherein the housing (10) includes a frame (100), a cooling chamber (121) is provided in the frame (100), the frame (100) is provided with a communication hole (122), the cooling chamber (121) is communicated with the accommodating chamber (101) through the communication hole (122), The frame (100) is provided with a pressure relief piece (62) which is opened under a set condition to exhaust, and when the pressure relief piece (62) is opened, the gas in the cooling cavity (121) is discharged from the pressure relief piece (62).
  11. 11. The battery device according to claim 10, wherein the frame (100) comprises a first side beam (11) and a second side beam (12) which are intersected, the second side beam (12) is provided with the communication hole (122) and the cooling cavity (121), a pressure release cavity (111) communicated with the cooling cavity (121) is arranged in the first side beam (11), and the pressure release cavity (111) is provided with the pressure release piece (62).
  12. 12. The battery device according to claim 10, wherein a plurality of partitions are provided in the cooling chamber (121), the partitions are disposed in parallel along a second direction, the second direction is perpendicular to the first direction, the partitions include at least two first partitions (151), the cooling chamber (121) includes a first wall (1212) and a second wall (1213) disposed opposite to each other in the second direction, One end of each of the two adjacent first partition plates (151) is connected with the first wall body (1212), the other end of each of the two adjacent first partition plates is spaced from the second wall body (1213), one end of the other of the two adjacent first partition plates (151) is spaced from the first wall body (1212), and the other end of the other of the two adjacent first partition plates is connected with the second wall body (1213) so as to divide the cooling cavity (121) into a plurality of end-to-end and tortuous cooling flow channels (1211).
  13. 13. The battery device according to claim 12, wherein the plurality of separators further includes a second separator (152), both ends of the second separator (152) are spaced apart from the first wall (1212) and the second wall (1213), respectively, Wherein the second partition (152) is arranged between at least two first partition plates (151), and/or The second partition board (152) is arranged between the first partition board (151) and the top wall of the cooling cavity (121), and/or The second partition plate (152) is arranged between the first partition plate (151) and the bottom wall of the cooling cavity (121).
  14. 14. The battery device according to claim 13, wherein the separator is adapted to exchange heat with the gas in the cooling chamber (121), and/or The thickness of the separator is in the range of 0.5mm-1.5mm, and/or The minimum distance between adjacent partition boards is 3mm-6mm.
  15. 15. A consumer, characterized by comprising a battery device (1) as claimed in any one of claims 1-14.

Description

Battery device and electric equipment with same Technical Field The invention relates to the technical field of battery devices, in particular to a battery device and electric equipment with the same. Background The battery in the related art is easy to cause large-area combustion or explosion in the battery pack due to the fact that the battery cell is subject to thermal runaway caused by water, short circuit, overcharge, high temperature, mechanical collision or manual operation, abuse and the like, and life and property safety of people are seriously threatened, so that how to arrange a structure for delaying thermal diffusion can delay the speed of diffusion under the condition that the battery cell is subject to thermal runaway, the battery pack becomes an important measure for improving the safety of the battery, and more escape time can be striven for users. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a battery device, each battery cell is provided with the first heat absorbing piece, heat transfer between adjacent battery cells can be blocked by utilizing the first heat absorbing piece, heat on the tab leading-out sheet is absorbed, the tab leading-out sheet is prevented from further transferring the heat into the battery cells, and further, the thermal runaway of the adjacent battery cells caused by high-temperature flame sprayed by the thermal runaway battery cells can be prevented, so that the use safety of the battery device is improved, the thermal diffusion speed of the battery cells is delayed, and more escape time is conveniently obtained for personnel. The invention also provides electric equipment with the battery device. The battery device comprises a shell, a battery pack and first heat absorbing pieces, wherein the shell defines a containing cavity, the battery pack is arranged in the containing cavity and comprises a plurality of battery cells which are arranged along a first direction, each battery cell is provided with a tab leading-out piece, each first heat absorbing piece is provided with a first heat absorbing piece, and the first heat absorbing piece corresponding to each battery cell extends to the tab leading-out piece to exchange heat with the tab leading-out piece. According to the battery device provided by the embodiment of the invention, each battery cell is provided with the first heat absorbing piece, heat transfer between adjacent battery cells can be blocked by utilizing the first heat absorbing piece, heat on the tab leading-out piece is absorbed, the tab leading-out piece is prevented from further transferring the heat into the battery cells, and further, the thermal runaway of the adjacent battery cells caused by high-temperature flame sprayed by the thermal runaway battery cells can be prevented, so that the use safety of the battery device is improved, the heat diffusion speed of the battery cells is delayed, and more escape time is conveniently obtained for personnel. In addition, the battery device according to the above-described embodiment of the present invention may have the following additional technical features: according to some embodiments of the invention, each of the battery cells is provided with the first heat absorbing member at both sides of the first direction. According to some optional embodiments of the present invention, two first heat absorbing members corresponding to the battery cells cooperatively define a placement cavity, the battery cells are located in the placement cavity, the tab leading-out piece extends out of the placement cavity, and/or the tab leading-out piece is located at one side of the battery cells in the second direction, the side of the battery cells in the first direction is the side with the largest area, the first heat absorbing members cover the side of the battery cells in the first direction, at least part of the side of the battery cells in the second direction, and at least part of the tab leading-out piece, and the first direction and the second direction intersect. According to some embodiments of the invention, a separation chamber is arranged between the battery pack and the shell, a second heat absorbing member is arranged in the separation chamber, and the second heat absorbing member is arranged on at least one wall body of the separation chamber. According to some alternative embodiments of the invention, the separation cavity is located at one side of the battery pack in a second direction, the first direction and the second direction are perpendicular, and the tab leading-out piece is located in the separation cavity. According to some embodiments of the invention, the housing includes a first side rail, a top cover and a bottom plate, the first side rail is disposed at a distance from the battery pack in a second direction, the top cover and the bottom plate are disposed opposite to eac