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CN-122025866-A - Battery device and electricity utilization device

CN122025866ACN 122025866 ACN122025866 ACN 122025866ACN-122025866-A

Abstract

The embodiment of the application discloses a battery device and an electricity utilization device. The battery device comprises a box body, a plurality of battery cell assemblies arranged along a first direction, wherein the first battery cell assemblies comprise a plurality of battery cells arranged along a second direction, each battery cell is provided with a first wall, the first wall faces to the first box body wall of the box body along the gravity direction, the plurality of liquid leakage detection assemblies are in one-to-one correspondence with the plurality of battery cell assemblies, the first liquid leakage detection assemblies are positioned between the first walls of the plurality of battery cells and the first box body wall, and the first liquid leakage detection assemblies are used for detecting whether electrolyte leakage occurs to the plurality of battery cells. The battery device and the power utilization device provided by the embodiment of the application can detect whether the battery monomer leaks or not, and the reliability of the battery device is improved.

Inventors

  • LI YONGZHEN
  • YANG LONGJIE
  • LIN LIANGJIE
  • JIA LILI
  • HUANG TAO

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (20)

  1. 1. A battery device, characterized by comprising: -a tank (11) comprising a first tank wall (113); A plurality of battery cell assemblies (200) arranged along a first direction, the plurality of battery cell assemblies (200) being accommodated in the case (11), a first battery cell assembly (210) of the plurality of battery cell assemblies (200) comprising a plurality of battery cells (20) arranged along a second direction, an electrolyte being accommodated inside each battery cell (20) of the plurality of battery cells (20), each battery cell (20) having a first wall (201), the first wall (201) being oriented towards the first case wall (113) along a gravitational direction; The battery pack comprises a plurality of leakage detection assemblies (300), wherein the plurality of leakage detection assemblies (300) are in one-to-one correspondence with the plurality of battery cell assemblies (200), a first leakage detection assembly (30) in the plurality of leakage detection assemblies (300) corresponds to the first battery cell assembly (210), the first leakage detection assembly (30) is located between a first wall (201) and a first box wall (113) of the plurality of battery cells (20), and the first leakage detection assembly (30) is used for detecting whether electrolyte leakage occurs in the plurality of battery cells (20).
  2. 2. The battery device according to claim 1, wherein the first liquid leakage detection assembly (30) includes a first insulating layer (31) and a sampling terminal (33), the first insulating layer (31) is fixed to the first case wall (113), a material of the first insulating layer (31) cannot be swelled by the electrolyte, the sampling terminal (33) is located on a side of the first insulating layer (31) away from the first case wall (113), and the sampling terminal (33) is used for detecting whether or not the plurality of battery cells (20) are leaked with electrolyte.
  3. 3. The battery device according to claim 2, wherein the first liquid leakage detection assembly (30) further comprises a second insulating layer (32), the sampling terminal (33) being located between the first insulating layer (31) and the second insulating layer (32), the material of the second insulating layer (32) being swellable by the electrolyte.
  4. 4. A battery device according to claim 3, characterized in that the first insulating layer (31) has a first recess (311) open towards the second insulating layer (32), at least part of the area of the sampling terminal (33) being located in the first recess (311), and/or, The second insulating layer (32) has a second recess (321) open towards the first insulating layer (31), at least part of the area of the sampling terminal (33) being located in the second recess (321).
  5. 5. The battery device according to claim 3 or 4, wherein the first insulating layer (31) has a third recess (312) open towards the first battery cell assembly (210), the bottom wall of the third recess (312) covering the orthographic projection of the first wall (201) of the plurality of battery cells (20) towards the bottom wall of the third recess (312).
  6. 6. The battery device according to claim 5, wherein the second insulating layer (32) is located within the third groove (312), the thickness of the second insulating layer (32) being smaller than the depth of the third groove (312).
  7. 7. The battery device according to any one of claims 2 to 6, wherein the sampling terminal (33) includes a first wire (331) and a second wire (332) arranged in parallel, The battery device comprises a control component (40), wherein a first end (3311) of a first metal wire (331) and a first end (3321) of a second metal wire (332) are connected with the control component (40), a second end (3312) of the first metal wire (331) and a second end (3322) of the second metal wire (332) are disconnected, and the control component (40) is used for detecting whether electrolyte exists or not to electrically connect the first metal wire (331) with the second metal wire (332).
  8. 8. The battery device according to claim 7, wherein the control assembly (40) comprises a first resistor (41) and a second resistor (42), a first end of the first resistor (41) being connected to a power source (43), a second end of the first resistor (41) being connected to a first end of the second resistor (42), a second end of the second resistor (42) being grounded; The sampling terminal (33) is connected in series with the first resistor (41) and in parallel with the second resistor (42) through a first end (3311) of the first wire (331) and a first end (3321) of the second wire (332), The control assembly (40) is further configured to determine whether electrolyte leakage of the plurality of battery cells (20) occurs based on a voltage at the second end of the first resistor (41).
  9. 9. The battery device according to claim 8, wherein the first resistor (41) and the second resistor (42) have equal resistance values; Wherein the control assembly (40) is further configured to: In the case that the voltage of the second end of the first resistor (41) is greater than half the voltage of the power supply (43), determining that the plurality of battery cells (20) are leaked, or In the case where the voltage of the second end of the first resistor (41) is equal to half the voltage of the power source (43), it is determined that the plurality of battery cells (20) are not leaked with electrolyte.
  10. 10. The battery device according to any one of claims 2 to 9, wherein the sampling terminal (33) includes a plurality of repeating segments (333) arranged in the second direction and connected end to end with each other, each of the plurality of repeating segments (333) includes a connected first segment (3331) and second segment (3332), each of the first segment (3331) and the second segment (3332) extends in a width direction of the first liquid leakage detection assembly (30), a first end of the first segment (3331) is a start end (3333) of each of the repeating segments (333), a first end of the second segment (3332) is an end (3334) of each of the repeating segments (333), and a second end (3335) of the first segment (3331) and a second end (3336) of the second segment (3332) are connected.
  11. 11. The battery device of claim 10, wherein the first section (3331) and the second section (3332) are each straight sections, and the clamp between the first section (3331) and the second section (3332) is an acute angle.
  12. 12. The battery device of claim 10, wherein the first section (3331) comprises a plurality of first portions (3337) bent and connected to each other and/or, The second section (3332) comprises a plurality of second portions (3338) bent and connected to each other.
  13. 13. The battery device of claim 12, wherein a first portion (3337) of the plurality of first portions (3337) connected to a second end (3336) of the second section (3332) is a straight line segment, a second portion (3338) of the plurality of second portions (3338) connected to a second end (3335) of the first section (3331) is a straight line segment, or A first portion (3337) of the plurality of first portions (3337) connected to the second end (3336) of the second section (3332) is a circular arc segment, and a second portion (3338) of the plurality of second portions (3338) connected to the second end (3335) of the first section (3331) is a circular arc segment.
  14. 14. The battery device of claim 13, wherein the first section (3331) comprises three first portions (3337) and the second section (3332) comprises three second portions (3338).
  15. 15. The battery device of claim 14, wherein each of the three first portions (3337) is a straight segment, each of the three second portions (3338) is a straight segment, Two adjacent first portions (3337) of the three first portions (3337) are perpendicular to each other, Two adjacent second portions (3338) of the three second portions (3338) are perpendicular to each other.
  16. 16. The battery device according to any one of claims 10 to 15, wherein the plurality of repeating segments (333) corresponds one-to-one to the plurality of battery cells (20).
  17. 17. The battery device according to any one of claims 1 to 16, wherein each battery cell (20) further comprises a second wall (202) opposite the first wall (201), the case (11) further comprises a second case wall (114) opposite the first case wall (113), the second wall (202) is fixed with the second case wall (114), A gap is formed between a surface of the first wall (201) facing the first liquid leakage detection assembly (30) and a surface of the first liquid leakage detection assembly (30) facing the first wall (201).
  18. 18. The battery device according to any one of claims 1 to 17, wherein the first wall (201) is provided with at least one of an electrode terminal (214), a pressure release mechanism (215) and a liquid injection structure (216).
  19. 19. The battery device according to any one of claims 1 to 18, wherein each battery cell (20) further comprises: a housing (211), the housing (211) being a hollow structure having an opening (2111); And a cover plate (212) for covering the opening (2111) of the housing (211), the cover plate (212) being the first wall (201).
  20. 20. An electrical device comprising a battery device as claimed in any one of claims 1 to 19 for powering the electrical device.

Description

Battery device and electricity utilization device Technical Field The application relates to the field of batteries, in particular to a battery device and an electric device. Background Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles. The battery device comprises a plurality of battery cells, electrolyte is contained in each battery cell and is limited by a processing technology, and in the use process of the battery device, the battery cells have the risk of leaking liquid, so that the operation safety of the battery device is affected. Therefore, it is necessary to detect whether or not the battery cell leaks. Disclosure of Invention The embodiment of the application provides a battery device and an electricity utilization device, which can detect whether a battery monomer leaks or not and improve the reliability of the battery device. In a first aspect, a battery device is provided, including a case including a first case wall, a plurality of battery cell assemblies arranged along a first direction, the plurality of battery cell assemblies being accommodated in the case, the first battery cell assembly of the plurality of battery cell assemblies including a plurality of battery cells arranged along a second direction, each battery cell having a first wall facing the first case wall along a gravitational direction, and a plurality of leakage detection assemblies in one-to-one correspondence with the plurality of battery cell assemblies, a first leakage detection assembly of the plurality of leakage detection assemblies corresponding to the first battery cell assembly, the first leakage detection assembly being located between the first wall of the plurality of battery cells and the first case wall, the first leakage detection assembly being configured to detect whether an electrolyte leakage occurs in the plurality of battery cells. The battery device according to the application is therefore provided with a battery cell, wherein the first wall of the battery cell faces the first housing wall in the direction of gravity, which battery cell has the risk of leakage. Because the battery device is internally provided with the plurality of leakage detection assemblies, and the plurality of leakage detection assemblies are in one-to-one correspondence with the plurality of battery cell assemblies, different leakage detection assemblies correspondingly detect different battery cell assemblies, and therefore, compared with the situation that the same leakage detection assembly is used for detecting all battery cells, the battery device provided by the application can determine the specific battery cell assembly with leakage according to the corresponding leakage detection assembly under the condition that the battery cells of any battery cell assembly leak, so that the accuracy of leakage detection is improved. For example, if the battery cell in the first battery cell assembly leaks, the electrolyte falls to the first leakage detection assembly below under the action of gravity, and the sampling terminal of the first leakage detection assembly collects and determines that the battery cell in the first battery cell assembly leaks. In some embodiments, the first leakage detection assembly includes a first insulating layer fixed to the first housing wall, the material of the first insulating layer being non-swellable by the electrolyte, and a sampling terminal located on a side of the first insulating layer away from the first housing wall, the sampling terminal for detecting whether the plurality of battery cells leak the electrolyte. Since the leakage detecting member is provided with the first insulating layer, which cannot be swelled by the electrolyte, it is considered that the first case wall of the case is generally a metal material, and if the electrolyte leakage occurs in the plurality of battery cells corresponding to the different leakage detecting members, the plurality of leakage points cannot be electrically connected or hardly electrically connected through the first case wall even under the insulating action of the first insulating layer, and the insulating reliability of the battery device can be improved. In some embodiments, the first leak detection assembly further includes a second insulating layer, the sampling terminal is positioned between the first insulating layer and the second insulating layer, and a material of the second insulating layer is swellable by the electrolyte. Under the condition that the battery monomer does not leak electrolyte, the insulation reliability between the adopted terminal and the battery monomer can