CN-122026746-A - Thermoelectric generation module and sweat detection device

CN122026746ACN 122026746 ACN122026746 ACN 122026746ACN-122026746-A

Abstract

The invention relates to the technical field of physiological information detection, in particular to a thermoelectric power generation module and a sweat detection device, wherein the thermoelectric power generation module comprises a thermoelectric conversion layer, a hot-end heat-conducting plate and a cold-end heat-conducting plate, the thermoelectric conversion layer is made of bismuth telluride-based thermoelectric materials and comprises a plurality of thermocouples connected in series, the hot-end heat-conducting plate contacts one side of the thermoelectric conversion layer, one side of the hot-end heat-conducting plate facing a heat source is provided with a heat aggregation structure, the cold-end heat-conducting plate contacts the other side of the thermoelectric conversion layer, which is away from the hot-end heat-conducting plate, the cold-end heat-conducting plate is provided with a heat-conducting insulating layer, the heat aggregation structure comprises a plurality of heat-conducting columns which are arranged at intervals, and the heat-conducting cross section of each heat-conducting column is gradually reduced along the direction from approaching the heat source to being away from the heat source. The invention mainly aims to provide a thermoelectric power generation module, which aims to improve the effective working temperature difference of the thermoelectric power generation module at a cold end and a hot end.

Inventors

ZHOU BOYU
ZHOU YANAN
PAN JUNJIE
LIU YAOCHENG

Assignees

歌尔科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260106

Claims (10)

1. The utility model provides a thermoelectric generation module, is applied to sweat detection device, its characterized in that, thermoelectric generation module (10) include: a thermoelectric conversion layer (11), the thermoelectric conversion layer (11) being made of a bismuth telluride-based thermoelectric material, comprising a plurality of thermocouples connected in series; A hot-end heat-conducting plate (12), wherein the hot-end heat-conducting plate (12) contacts one side of the thermoelectric conversion layer (11), and a thermal coalescing structure (121) is arranged on one side of the hot-end heat-conducting plate (12) facing the heat source; a cold end heat conducting plate (13), wherein the cold end heat conducting plate (13) contacts the other side of the thermoelectric conversion layer (11) away from the hot end heat conducting plate (12), and a heat conducting insulating layer (13 a) is arranged on one side of the cold end heat conducting plate (13) away from the heat source; The heat aggregation structure (121) comprises a plurality of heat conduction columns (1221) which are arranged at intervals, and the heat conduction cross section of each heat conduction column (1221) is gradually reduced along the direction from the heat source to the heat source.
2. The thermoelectric generation module according to claim 1, wherein the thermoelectric generation module (10) further comprises a phase change filling layer (14), and the phase change filling layer (14) is filled in a gap formed by the heat conducting columns (1221) arranged at intervals.
3. The thermoelectric generation module according to claim 1, wherein the heat conducting columns (1221) are made of copper-graphene composite material, the height of the heat conducting columns (1221) is 0.3-0.8 mm, and the distance between adjacent heat conducting columns (1221) is 0.5-1.0 mm.
4. The thermoelectric generation module according to claim 1, wherein the heat conducting insulating layer (13 a) is made of aluminum nitride ceramic material, and a groove structure (13 b) is formed on a side of the heat conducting insulating layer (13 a) facing away from the heat source, and the groove structure (13 b) is configured to increase a contact area with a heat dissipation medium.
5. The thermoelectric generation module of claim 1 wherein the thermoelectric conversion layer (11) comprises a first region (11 a) of a first bismuth telluride-based material and a second region (11 b) of a second bismuth telluride-based material, the first region (11 a) at least partially overlapping a projected area of the thermal coalescing structure (121), the second region (11 b) being located at a periphery of the first region (11 a), wherein an n-type dopant atomic percent of the first bismuth telluride-based material is higher than the second bismuth telluride-based material.
6. A sweat detection device, the sweat detection device comprising: the sweat collecting device comprises a patch module (20), wherein the patch module (20) is provided with a sweat collecting micro-channel (20 a) and a detection hole (20 b), and the detection hole (20 b) is communicated with the sweat collecting micro-channel (20 a); The circuit module (30) is arranged on the patch module (20), the circuit module (30) is provided with a detection sensor, and the detection end of the detection sensor is positioned in the detection hole (20 b); An evaporation plate (40), wherein the evaporation plate (40) is arranged on the patch module (20) and is at least attached to the area of the patch module (20) provided with the detection hole (20 b), one side of the evaporation plate (40) facing away from the patch module (20) is provided with an evaporation surface, the evaporation surface exposes the patch module (20) and is configured to evaporate sweat, and The thermoelectric generation module (10) according to any one of claims 1-5, wherein the thermoelectric generation module (10) is arranged between the patch module (20) and the evaporation plate (40), wherein a hot end heat conducting plate (12) of the thermoelectric generation module (10) is arranged in contact with the patch module (20), and wherein the high heat conducting insulating layer (13 a) is arranged in contact with the evaporation plate (40); Wherein the thermoelectric generation module (10) is electrically connected to the circuit module (30), the thermoelectric generation module (10) being configured to power the circuit module (30).
7. The sweat detection device of claim 6 wherein the circuit module (30) is further provided with an energy storage unit comprising a capacitor bank and a micro lithium polymer battery arranged in series, the capacitor bank being configured to receive and store pulsed electrical energy generated by the thermoelectric generation module (10), the micro lithium polymer battery being configured to store electrical energy converted by the capacitor bank.
8. The sweat detection device of claim 7, wherein the circuit module (30) is further provided with a controller configured to monitor a state of charge of the energy storage unit and to adjust an operating mode of the circuit module (30) in dependence on the state of charge and a preset threshold.
9. The sweat detection device of claim 8, wherein the energy storage unit is further provided with an energy state monitoring circuit configured to monitor the state of charge of the capacitor bank and the micro lithium polymer battery in real time and an adaptive power management controller configured to: Acquiring a charge state of the energy storage unit; and controlling and switching the working mode of the circuit module (30) according to the comparison result of the charge state and a preset threshold value.
10. The sweat detection device of claim 9, wherein the step of controlling and switching the operation mode of the circuit module (30) according to the comparison of the state of charge with a preset threshold value comprises: when the charge state is lower than a first preset threshold value, controlling and switching the working mode of the circuit module (30) to be set into a first working mode; Controlling and switching the operating mode of the circuit module (30) to be set to a second operating mode when the state of charge is between the first and second threshold values; When the state of charge is above the second threshold, the operating mode of the circuit module (30) is controlled and switched to be set to a third operating mode.

Description

Thermoelectric generation module and sweat detection device Technical Field The invention relates to the technical field of physiological information detection, in particular to a thermoelectric generation module and a sweat detection device. Background The sweat detection device is used as a noninvasive wearable physiological monitoring tool, and the long-term and continuous working capacity of the sweat detection device depends on the duration of an internal power supply. In order to get rid of the dependence on the traditional battery, the prior art proposes a scheme for generating electricity by utilizing the temperature difference between a human body and the environment, namely, the temperature difference generating module attached to the skin is used for generating electric energy by utilizing the difference between the skin temperature and the environment temperature. However, the power generation efficiency and stability of the thermoelectric power generation module are severely limited by the external environment. The skin temperature is relatively fixed as a heat source and is difficult to promote, and the cold end heat dissipation efficiency at the environment side is greatly reduced in a user resting or windless state, so that the effective working temperature difference sensed by the thermoelectric power generation module is insufficient, and the output power of the thermoelectric power generation module is large in fluctuation and poor in reliability. Disclosure of Invention The invention mainly aims to provide a thermoelectric power generation module, which aims to improve the effective working temperature difference of the thermoelectric power generation module at a cold end and a hot end. In order to achieve the above object, the thermoelectric power generation module provided by the present invention is applied to a sweat detection device, and the thermoelectric power generation module includes: A thermoelectric conversion layer made of bismuth telluride-based thermoelectric material including a plurality of thermocouples connected in series; A hot-end heat-conducting plate, which contacts one side of the thermoelectric conversion layer, and one side of which faces the heat source is provided with a heat-collecting structure; A cold end heat conducting plate, wherein the cold end heat conducting plate contacts with the other side of the thermoelectric conversion layer, which is away from the hot end heat conducting plate, and a heat conducting insulating layer is arranged on one side of the cold end heat conducting plate, which is away from the heat source; the heat coalescing structure comprises a plurality of heat conducting columns which are arranged at intervals, and the heat conducting cross section of each heat conducting column is gradually reduced along the direction from the heat source to the heat source. In an embodiment of the invention, the thermoelectric generation module further includes a phase change filling layer, and the phase change filling layer is filled in a gap formed by the heat conducting columns arranged at intervals. In one embodiment of the invention, the heat conducting columns are made of copper-graphene composite materials, the height of each heat conducting column is 0.3-0.8 mm, and the distance between every two adjacent heat conducting columns is 0.5-1.0 mm. In one embodiment of the invention, the heat conducting insulating layer is made of aluminum nitride ceramic material, and a groove structure is formed on one side of the heat conducting insulating layer, which is opposite to the heat source, and is configured to increase the contact area with the heat dissipation medium. In one embodiment of the invention, the thermoelectric conversion layer comprises a first region formed by a first bismuth telluride-based material and a second region formed by a second bismuth telluride-based material, wherein the first region at least partially overlaps with a projection region of the heat-polymerized structure, and the second region is located at the periphery of the first region, and wherein the first bismuth telluride-based material has a higher atomic percentage of n-type dopant than the second bismuth telluride-based material. The present invention also proposes a sweat detection device comprising: The patch module is provided with a sweat collecting micro-channel and a detection hole, and the detection hole is communicated with the sweat collecting micro-channel; the circuit module is arranged on the patch module and is provided with a detection sensor, and the detection end of the detection sensor is positioned in the detection hole; The patch module comprises a patch module, an evaporation plate, an evaporation surface and a detection hole, wherein the patch module is provided with a detection hole, the evaporation plate is arranged on the patch module and is at least attached to the area of the patch module, the detection hole is arranged on the surface