Search

CN-121983708-A - Liquid cooling device for solid-state battery module

CN121983708ACN 121983708 ACN121983708 ACN 121983708ACN-121983708-A

Abstract

The invention discloses a liquid cooling device of a solid-state battery module, which belongs to the technical field of solid-state battery modules and comprises a plurality of battery units, wherein each battery unit comprises a solid-state battery unit and a side cooling structure, each side cooling structure comprises a pump driving unit and a liquid flow cooling channel, and a plurality of sensing units are uniformly arranged on each liquid flow cooling channel. When the solid-state battery module operates, each solid-state battery monomer forming the battery module can be independently subjected to liquid cooling and cooling through the side cooling structure arranged on each solid-state battery monomer, and the side cooling structure can monitor the temperatures of different parts of the side wall surfaces of the solid-state battery monomers in real time when the temperatures of certain partial areas of the surfaces of the single solid-state battery monomers are monitored to be overhigh, the flow rate of cooling liquid in a high-temperature area can be adjusted in a targeted manner, the heat exchange intensity of the solid-state battery monomers in different heat dissipation areas is adjusted, the hot spot of the single battery can be eliminated rapidly through dynamic liquid cooling adjustment, and the heat transfer path is blocked in a targeted manner.

Inventors

  • CHEN WENYUAN

Assignees

  • 领新绿能科技(江苏)有限公司

Dates

Publication Date
20260505
Application Date
20260210

Claims (10)

  1. 1. The liquid cooling device of the solid-state battery module is characterized by comprising a plurality of battery units (100); the battery unit (100) comprises a solid-state battery cell (101) and a side cooling structure arranged on the side surface of the solid-state battery cell (101); The side cooling structure comprises a pump driving unit and a liquid cooling channel, wherein the liquid cooling channel comprises cooling liquid (211), the pump driving unit is used for driving the cooling liquid (211) in the liquid cooling channel to circularly flow, a plurality of sensing units are uniformly arranged on the liquid cooling channel, and the sensing units are used for sensing the liquid temperature of the cooling liquid around the liquid cooling channel; the sensing unit comprises a variable resistor and an elastically telescopic regulating and controlling piece, the free end of the regulating and controlling piece stretches into the liquid flow cooling channel and is contacted with cooling liquid (211), and a thermosensitive expansion layer (213) contacted with the free end of the regulating and controlling piece is arranged in the regulating and controlling piece; The heat energy in the cooling liquid (211) is conducted to the heat-sensitive expansion layer (213) through the free end in the control part, and when the heat-sensitive expansion layer (213) is heated and expanded, the free end in the control part is driven to retract, and the length of the free end of the control part extending into the liquid flow cooling channel is shortened; the variable resistor is electrically connected with the pump driving unit and comprises a resistor body (219) connected with the free end of the sensing unit and a contact spring piece (220) connected with the fixed end of the sensing unit.
  2. 2. The liquid cooling device for the solid battery module according to claim 1, wherein the side cooling structure further comprises two liquid cooling plate bodies (201) which are respectively connected to side walls of two sides of the solid battery unit (101) and are symmetrically arranged, and a side shielding frame (203) is connected to one of the liquid cooling plate bodies (201); The side wall of the liquid cooling plate body (201) is connected with a heat conduction pad, and when the liquid cooling plate body (201) is fixedly arranged on the side wall of the solid-state battery cell (101), the heat conduction pad is tightly attached to the surface of the side wall of the solid-state battery cell (101); The liquid cooling plate body (201) is connected with a protection cover body (202) on one side far away from the heat conduction pad, an annular heat conduction pad is arranged on one side, close to the liquid cooling plate body (201), of the protection cover body (202), and when the protection cover body (202) is fixedly installed on the liquid cooling plate body (201), the annular heat conduction pad is tightly attached to the surface of the side wall of the liquid cooling plate body (201).
  3. 3. The liquid cooling device of the solid state battery module according to claim 2, wherein the number of the liquid cooling channels is two, and each liquid cooling plate body (201) is provided with one liquid cooling channel.
  4. 4. The liquid cooling device of claim 3, wherein the liquid cooling channel further comprises an S-shaped cold channel (209) arranged in the liquid cooling plate body (201) corresponding to the liquid cooling channel; The cooling liquid (211) is filled in the cold runner (209); and the input end and the output end of the cold runner (209) are respectively provided with an input port and an output port, and the input port and the output port are both connected to the liquid cooling plate body (201) and extend out from the surface of the liquid cooling plate body (201).
  5. 5. The liquid cooling device for a solid state battery module according to claim 4, wherein the pump driving unit comprises a connecting pipeline (208) and a liquid storage tank (204) connected to the side wall of the inner cavity of the side shield frame (203); the lower part of the side wall of the liquid storage tank (204) is connected with a liquid pump (205), the input end of the liquid pump (205) is connected with a liquid inlet pipeline (206), and the output end of the liquid pump (205) extends into the liquid storage tank (204); A liquid outlet pipeline (207) is fixedly communicated with the upper part of one side of the liquid storage tank (204) away from the liquid pump (205); the liquid storage tank (204), the liquid inlet pipeline (206), the liquid outlet pipeline (207) and the connecting pipeline (208) are filled with cooling liquid (211).
  6. 6. The liquid cooling device of solid state battery module according to claim 5, wherein one end of the connecting pipe (208) is connected to the output port of one of the liquid cooling channels, and the other end is connected to the input port of the other liquid cooling channel; One end of the liquid outlet pipeline (207) far away from the liquid storage tank (204) is connected with an input port of one of the liquid flow cold channels, and one end of the liquid inlet pipeline (206) far away from the liquid pump (205) is connected with an output port of the other liquid flow cold channel.
  7. 7. The liquid cooling device for a solid state battery module according to claim 4, wherein said regulating member further comprises a heat insulating cover (217) connected to an end portion of the inner cavity of the protective cover body (202); A side bulge part (218) is connected to the side wall of the inner cavity of the heat insulation housing (217); The end part of the heat insulation housing (217) is inserted with a heat conduction rod (212) in a sealing way, the heat conduction rod (212) is sleeved with a heat insulation sleeve (221) which is inserted and fixed in the liquid cooling plate body (201), one end of the heat conduction rod (212) extends into the cold runner (209), and the other end extends into the inner cavity of the heat insulation housing (217); the periphery of the heat conduction rod (212) is sleeved and fixed with a forced piston (215) which is sealed and slides in the inner cavity of the heat insulation housing (217); the end part of the forced piston (215) is connected with a return spring (216), and one end of the return spring (216) far away from the forced piston (215) is connected with the end part of the inner cavity of the protective cover body (202); the side wall of one end of the heat conducting rod (212) extending into the inner cavity of the heat insulation housing (217) is also connected with a heat conducting thin rod (214).
  8. 8. The liquid cooling device of claim 7, wherein the heat-sensitive expansion layer (213) is filled in an inner cavity of the heat-insulating housing (217), the forced piston (215) is between the heat-sensitive expansion layer (213) and the return spring (216), and the heat-guiding thin rod (214) is positioned inside the heat-sensitive expansion layer (213); one end of the heat insulation sleeve (221) is connected with the end part of the heat insulation housing (217), the other end of the heat insulation sleeve is flush with the bottom wall of the inner cavity of the cold runner (209), and when the end part of the forced piston (215) is propped against the end part of the side bulge part (218), the end part of the heat conduction rod (212) is flush with the end part of the heat insulation sleeve (221).
  9. 9. The liquid cooling device for a solid state battery module according to claim 7, wherein the fixed end of the contact spring plate (220) is connected to the side wall of the side protrusion (218); The free end of the contact spring piece (220) is elastically abutted against the surface of the resistor body (219); The resistor (219) is a resistance wire spirally wound and fixed on the periphery of the heat conducting rod (212).
  10. 10. The liquid cooling apparatus for a solid state battery module according to claim 5, wherein said liquid pump (205) in said pump driving unit and said plurality of variable resistors are connected in series with each other.

Description

Liquid cooling device for solid-state battery module Technical Field The invention relates to the technical field of solid-state battery modules, in particular to a liquid cooling device of a solid-state battery module. Background A solid-state battery module is a battery assembly in which a plurality of solid-state battery cells are combined by a specific connection method, and a management system, structural members, etc., are provided to achieve specific functions and performances. The core is that a solid electrolyte is adopted to replace the traditional liquid electrolyte, and lithium ions are transmitted between the anode and the cathode through the solid electrolyte to complete charge and discharge circulation. This change makes solid-state battery module compact structure, and the volume is less, and energy density promotes by a wide margin than other battery modules. The current methods for solid-state battery modules in the market mainly comprise air cooling, metal conduction cooling, liquid cooling and the like. However, these conventional heat dissipation techniques have some drawbacks, particularly in the case of solid-state battery modules that cope with high energy density and high power output, the limitations thereof are more remarkable. Air cooling relies on natural convection or forced convection of air to dissipate heat, but the cooling efficiency is relatively low, so that the heat dissipation requirement of a high-power solid-state battery module in heavy-load operation is difficult to meet, and local overheating of the battery is easy to cause; The metal conduction cooling has better heat conduction performance, but has heavier weight, is complicated to arrange in the battery module, and is difficult to realize accurate temperature control of the battery cells; Although liquid cooling has higher heat exchange efficiency than air cooling, when the solid-state battery module is cooled through the traditional water cooling plate, most of the heat is only in contact with one side or two sides of the battery module through the single water cooling plate, and the heat can only be conducted out through the surface conduction of the battery module. The side wall of the middle battery monomer is wrapped by the adjacent batteries, heat is easy to be coupled and accumulated among the battery monomers, heat spreading is easy to be caused, once local thermal runaway occurs, the heat dissipation efficiency of the traditional water cooling plate heat dissipation form is far insufficient for rapidly guiding out a large amount of heat, the thermal runaway diffusion cannot be effectively prevented, even serious safety accidents such as fire and explosion can be caused, and great potential safety hazards exist. In view of this, we propose a solid-state battery module liquid cooling device. Disclosure of Invention The invention aims to provide a solid-state battery module liquid cooling device which solves the technical problems in the background technology. The technical scheme of the invention provides a solid-state battery module liquid cooling device, which comprises a plurality of battery units; The battery unit comprises a solid-state battery cell and a side cooling structure arranged on the side surface of the solid-state battery cell; The side cooling structure comprises a pump driving unit and a liquid flow cooling channel, wherein the liquid flow cooling channel comprises cooling liquid, the pump driving unit is used for driving the cooling liquid in the liquid flow cooling channel to circularly flow, a plurality of sensing units are uniformly arranged on the liquid flow cooling channel, and the sensing units are used for sensing the liquid temperature of the cooling liquid around the liquid flow cooling channel; the sensing unit comprises a variable resistor and an elastically telescopic regulating and controlling piece, the free end of the regulating and controlling piece stretches into the liquid flow cold channel and is contacted with the cooling liquid, and a thermosensitive expansion layer contacted with the free end of the regulating and controlling piece is arranged in the regulating and controlling piece; The heat energy in the cooling liquid is conducted to the heat-sensitive expansion layer through the free end in the control piece, and when the heat-sensitive expansion layer is heated and expanded, the free end in the control piece is driven to retract, and the length of the free end of the control piece extending into the liquid flow cold channel is shortened; The variable resistor is electrically connected with the pump driving unit and comprises a resistor body connected with the free end of the sensing unit and a contact spring piece connected with the fixed end of the sensing unit. As an alternative scheme of the technical scheme of the invention, the side cooling structure further comprises two liquid cooling plate bodies which are respectively connected to the side walls of t