Intelligent thermal management battery pack cooling system and battery pack

Abstract

The invention provides an intelligent thermal management battery pack cooling system, which comprises a temperature difference power generation module, a semiconductor refrigeration module and an electronic control module, and is characterized in that the heat absorption end of the temperature difference power generation module and the refrigeration end of the semiconductor refrigeration module are respectively connected with a battery module; and the electronic control module is connected with the thermoelectric power generation module and the semiconductor refrigeration module to realize dynamic control of the thermoelectric power generation module and the semiconductor refrigeration module. The invention also provides a battery pack for intelligent thermal management. The battery pack comprises a box body assembly, a battery module, a control detection system and a battery pack cooling system, the heat absorption end of the thermoelectric power generation module and the refrigeration end of the semiconductor refrigeration module of the battery pack cooling system are respectively connected with the battery module, when the heat of the battery module is continuously and sharply increased, the continuous heat dissipation of the thermoelectric power generation module is kept, and meanwhile, the semiconductor refrigeration module is started to refrigerate through electric energy; and the battery module is rapidly cooled in cooperation with a double heat absorption and heat dissipation structure, so that the problem of timely heat dissipation of sudden high-rate discharge and heat accumulation in a short time is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle batteries, and in particular to a battery pack cooling system for a type of battery thermal management and a corresponding battery pack. Background Art

[0002] As a key component of electric vehicle energy source, power battery requires the maximum temperature of battery cell to be less than 55℃, the temperature difference between each battery cell is ≤5℃, and the temperature difference inside each cell is 5~10℃. When electric vehicle is running, its power battery will generate a lot of heat, which will accumulate if not discharged in time.

[0003] At present, the existing active cooling systems for battery packs mainly include air cooling, liquid cooling, and phase change material cooling. Air cooling has a low heat transfer coefficient and insufficient cooling capacity; liquid cooling has a large heat transfer coefficient and strong cooling capacity, but requires high sealing; phase change material cooling has a small heat transfer coefficient and strong modulation ability of non-steady-state heat flow, which can control the temperature change range, but when the battery pack is discharged at a high rate, a lot of heat is generated in a short time. The current heat dissipation method cannot promptly handle the sudden high-rate discharge and timely heat dissipation problems in a short period of time.

[0004] On December 21, 2018, the Patent Office of the State Intellectual Property Office of China published an application number of 201810744959.4, entitled "Automatic Control Thermal Management System for Power Batteries Based on Phase Change Energy Storage and Thermoelectric Effect". This technology absorbs the heat emitted by the battery through the hollow cylinder of phase change material outside the single cylindrical battery, and reduces or increases the temperature of the battery pack module by connecting the semiconductor thermoelectric sheet positively or negatively. However, this technology is only applicable to cylindrical batteries; the control of positive and negative connection operations is difficult, the reliability is low, and only one connection method can be selected at a time, which cannot solve the problem of sudden high-rate discharge and timely heat dissipation in a short period of time.

[0005] Therefore, it is necessary to provide a battery pack cooling system and battery pack with intelligent thermal management to solve the above technical problems. Summary of the invention

[0006] The present invention provides a battery pack cooling system with intelligent thermal management, which solves the problem of timely heat dissipation of sudden high-rate discharge and heat accumulation in a short period of time.

[0007] In order to solve the above technical problems, the present invention provides a battery pack cooling system with intelligent thermal management, comprising a thermoelectric power generation module, a semiconductor refrigeration module and an electronic control module, wherein the heat absorption end of the thermoelectric power generation module and the cooling end of the semiconductor refrigeration module are respectively connected to the battery module; the electronic control module is connected to the thermoelectric power generation module and the semiconductor refrigeration module to realize dynamic control of the thermoelectric power generation module and the semiconductor refrigeration module; the thermoelectric power generation module comprises a first heat conduction plate, the heat source conduction plate connects one end of two different semiconductor materials, the other ends of the two different semiconductor materials are respectively connected to the second heat conduction plate and the third heat conduction plate, the second heat conduction plate and the third heat conduction plate are electrically connected to the positive and negative electrodes of the battery; the semiconductor refrigeration module comprises a first guide bar, a second guide bar and a third guide bar, the first guide bar connects one end of the two different semiconductor materials, the other ends of the two different semiconductor materials are respectively connected to the second guide bar and the third guide bar, and the two end wires of the second guide bar and the third guide bar are connected to the positive and negative electrodes of the power supply.

[0008] Preferably, it also includes a first summary guide plate and a second summary guide plate, the first summary guide plate connects multiple groups of the first heat conduction plates, the second summary guide plate connects multiple groups of the second heat conduction plates and the third heat conduction plates, and both ends of the second summary guide plate are electrically connected to the positive and negative electrodes of the battery.

[0009] Preferably, it also includes a third aggregation wire and a fourth aggregation wire, the third aggregation wire connects multiple groups of the first guide bars, the fourth aggregation wire connects multiple groups of the second guide bars and the third guide bars, and both ends of the fourth aggregation wire are electrically connected to the positive and negative poles of the power supply.

[0010] The present invention also provides a battery pack with intelligent thermal management, which solves the problem of timely heat dissipation of sudden high-rate discharge and heat accumulation in the battery pack within a short period of time.

[0011] In order to solve the above technical problems, a battery pack with intelligent thermal management includes a box assembly, a battery module, a control and detection system and the battery pack cooling system mentioned above; the heat absorption end of the temperature difference power generation module and the cooling end of the semiconductor refrigeration module of the battery pack cooling system are respectively connected to the battery module, and the battery module and the battery pack cooling system are integrated in the box assembly.

[0012] Preferably, a heat sink aluminum sheet is provided below the battery module, the battery cells of the battery module are in contact with the heat sink aluminum sheet, and the heat sink aluminum sheet is connected below the heat absorption end of the temperature difference power generation module and the cooling end of the semiconductor refrigeration module.

[0013] Preferably, the heat absorption end of the thermoelectric power generation module and the cooling end of the semiconductor refrigeration module are evenly spaced and respectively connected to the battery modules, and a heat insulation device is arranged between the heat absorption end of the thermoelectric power generation module and the cooling end of the semiconductor refrigeration module.

[0014] Preferably, the cold end of the temperature difference power generation module and the hot end of the semiconductor refrigeration module are evenly spaced, and a heat insulation device and an insulating device are arranged between the cold end of the temperature difference power generation module and the hot end of the semiconductor refrigeration module, and are respectively attached to the bottom of the box body of the box body assembly to conduct heat to the outside of the battery system.

[0015] Preferably, the power supply is an external direct current or the battery power supply.

[0016] Compared with the related art, the battery pack cooling system and battery pack with intelligent thermal management provided by the present invention have the following beneficial effects:

[0017] The present invention provides a battery pack cooling system and a battery pack with intelligent thermal management, which are suitable for situations where the battery pack has small length and width dimensions, large height dimensions, and needs to be discharged at a high rate. In the case of high-rate discharge, a large amount of concentrated heat is generated in a short period of time. The hot end of the thermoelectric power generation module of the present application quickly absorbs heat and converts it into electrical energy through a semiconductor thermocouple, thereby absorbing and discharging battery thermal energy and collecting energy; while the heat continues to increase sharply, while maintaining the continuous heat dissipation of the thermoelectric power generation module, the semiconductor refrigeration module can be started, and the battery module can be rapidly cooled down through electrical energy cooling and the dual heat absorption and heat dissipation structure to stabilize the temperature inside the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a thermoelectric power generation module of a first embodiment of a battery pack cooling system provided by the present invention;

[0019] Figure 2 A schematic diagram of a semiconductor refrigeration module of a first embodiment of a battery pack cooling system provided by the present invention;

[0020] Figure 3 A schematic diagram of a second embodiment of a battery pack cooling system provided by the present invention;

[0021] Figure 4 for Figure 3 A partial enlarged schematic diagram of the temperature difference power generation module in the middle part A;

[0022] Figure 5 for Figure 3 A partial enlarged schematic diagram of the semiconductor refrigeration module in the middle B part;

[0023] Figure 6 A schematic diagram of a battery pack according to a third embodiment of the present invention;

[0024] Numbers in the figure:

[0025] 1. Thermoelectric power generation module, 101. heat absorption end, 102. first heat conduction plate, 103. second heat conduction plate, 104. third heat conduction plate, 105. first aggregation guide plate, 106. second aggregation guide plate, 107. heat release end,

[0026] 2. semiconductor refrigeration module, 201. refrigeration end, 202. first guide bar, 203. second guide bar, 204. third guide bar, 205. third aggregation wire, 206. fourth aggregation wire,

[0027] 3. Battery module, 4. Control and detection system, 5. Battery pack cooling system, 6. Box cover, 7. Lower box assembly, 8. Heat dissipation aluminum sheet. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0029] First embodiment

[0030] like Figure 1 and 2 As shown, a battery pack cooling system with intelligent thermal management includes a thermoelectric power generation module 1, a semiconductor refrigeration module 2 and an electronic control module. The heat absorption end 101 of the thermoelectric power generation module 1 and the cooling end 201 of the semiconductor refrigeration module 2 are respectively connected to the battery module 3; the electronic control module is connected to the thermoelectric power generation module 1 and the semiconductor refrigeration module 2 to achieve dynamic control of the thermoelectric power generation module 1 and the semiconductor refrigeration module 2. The thermoelectric power generation module 1 includes a first heat conduction plate 102, the first heat conduction plate 102 connects one end of two different semiconductor materials, and the other ends of the two different semiconductor materials are respectively connected to a second heat conduction plate 103 and a third heat conduction plate 104, and the second heat conduction plate 103 and the third heat conduction plate 104 are electrically connected to the positive and negative electrodes of the battery 108. The first heat conduction plate 102, the second heat conduction plate 103 and the third heat conduction plate 104 are made of electrically conductive and heat-conductive metal plates. The semiconductor refrigeration module 2 includes a first guide bar 202, a second guide bar 203 and a third guide bar 204, wherein the first guide bar 202 connects one end of two different semiconductor materials, and the other ends of the two different semiconductor materials are respectively connected to the second guide bar 203 and the third guide bar 204, and the wires at both ends of the second guide bar 203 and the third guide bar 204 are connected to the positive and negative poles of the power supply.

[0031] Second embodiment

[0032] See also Figure 3 , 4As shown in Figure 5, based on the intelligent thermal management battery pack cooling system provided by the first embodiment of the present application, the second embodiment of the present application proposes another intelligent thermal management battery pack cooling system. The second embodiment is only a preferred method of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0033] Specifically, the difference of the intelligent thermal management battery pack cooling system provided by the second embodiment of the present application is that, preferably, the thermoelectric power generation module 1 further includes a first summary guide plate 105 and a second summary guide plate 106, the first summary guide plate 105 is connected to multiple groups of the first heat conduction plates 102 corresponding to the battery module 3, and the heat absorption ends 101 of multiple groups of thermoelectric power generation modules 1 are connected in parallel, and the second summary guide plate 106 is connected to multiple groups of the second heat conduction plates 103 and the third heat conduction plates 104, so that the heat release ends 107 of multiple groups of thermoelectric power generation modules 1 are connected in parallel to form a thermocouple series connection, thereby increasing the heat absorption and cooling capacity, which is conducive to the timely heat dissipation of high-power discharge. The two ends of the second summary guide plate 106 are electrically connected to the positive and negative electrodes of the battery or the load resistor. It also includes a third summary wire 205 and a fourth summary wire 206, wherein the third summary wire 205 connects multiple groups of the first guide bars 202, so that the cooling ends 201 of multiple groups of semiconductor refrigeration modules 2 are connected in parallel, and the fourth summary wire 206 connects multiple groups of the second guide bars 203 and the third guide bars 204, so that multiple groups of semiconductor refrigeration modules 2 form thermocouple series connection, and the two ends of the fourth summary wire 206 are electrically connected to the positive and negative poles of the power supply. Multiple groups of temperature difference power generation modules 1 and multiple groups of semiconductor refrigeration modules 2 are arranged alternately and connected to battery modules 3 respectively, so as to increase the cooling capacity and the power generation power, so that the converted and collected electric energy can be effectively utilized. This embodiment optimizes the cooling distribution, increases the conversion power, and adopts a multi-stage heat dissipation method, which is conducive to the timely heat dissipation of high-power discharge.

[0034] Third embodiment

[0035] See also Figures 1 to 6 As shown, based on the intelligent thermal management battery pack cooling system provided by the first embodiment or the second embodiment of the present application, the third embodiment of the present application proposes an intelligent thermal management battery pack. The implementation of the third embodiment will not affect the independent implementation of the first embodiment and the second embodiment.

[0036] Specifically, the difference of the intelligent thermal management battery pack provided in the third embodiment of the present application is that an intelligent thermal management battery pack includes a box assembly, a battery module 3, a control detection system 4 and a battery pack cooling system 5 described in the first embodiment or the second embodiment; the box assembly includes a box cover 6, a lower box assembly 7, etc., and the battery module 3, the battery pack cooling system 5 and the control detection system 4 are integrated in the box. The battery pack cooling system 5 includes a thermoelectric power generation module 1, a semiconductor refrigeration module 2 and an electronic control module, and the heat absorption end 101 of the thermoelectric power generation module 1 and the cooling end 201 of the semiconductor refrigeration module 2 are respectively connected to the battery module 3; the electronic control module is connected to the thermoelectric power generation module 1 and the semiconductor refrigeration module 2 to realize the dynamic control of the thermoelectric power generation module 1 and the semiconductor refrigeration module 2. A heat dissipation aluminum sheet 8 is provided below the battery module 3, and the battery cells of the battery module 3 are in contact with the heat dissipation aluminum sheet 8. The heat dissipation aluminum sheet 8 is connected to the heat absorption end 101 of the thermoelectric power generation module 1 below, so that the heat generated by the battery module 3 is transferred to the heat absorption end 101 of the thermoelectric power generation module 1, and then the PN junction Seebeck effect of the semiconductor material is used to generate current in the circuit, thereby dissipating the heat and collecting the thermal energy of the battery module 3.

[0037] The cooling end 201 of the semiconductor refrigeration module 2 arranged alternately with the temperature difference power generation module 1 is also connected to the lower part of the heat dissipation aluminum sheet 8, and a heat insulation device is arranged between the heat absorption end 101 of the temperature difference power generation module 1 and the cooling end 201 of the semiconductor refrigeration module 2. When the electronic control module detects that the battery module 3 is discharged at a high power and the accumulated heat exceeds the set threshold, the power supply of the semiconductor refrigeration module 2 is turned on to provide a DC power supply to the semiconductor refrigeration module 2. Through the conduction effect of the PN junction of the semiconductor material, the cooling end 201 in contact with the battery module 3 is actively cooled. The two heat dissipation systems work at the same time, the heat dissipation is more timely, the normal working temperature of the battery module can be better guaranteed, and the service life of the battery pack is improved.

[0038] The heat release end 107 of the thermoelectric power generation module 1 and the hot end of the semiconductor refrigeration module 2 are evenly arranged alternately, and a heat insulation device and an insulating device are arranged between the heat release end 107 of the thermoelectric power generation module 1 and the hot end of the semiconductor refrigeration module 2, which can be respectively attached to the bottom of the box body of the box body assembly to conduct heat to the outside of the battery system, and can also be connected to a battery or other components to form a loop for energy collection or utilization. The power supply of the semiconductor refrigeration module 2 is an external direct current or a battery of the thermoelectric power generation module 1 as a power supply.

[0039] This embodiment is suitable for situations where the length and width of the battery pack are small, the height is large, and a high rate discharge is required. In the case of high rate discharge, a lot of concentrated heat is generated in a short period of time. The hot end of the temperature difference power generation module of this application quickly absorbs heat and converts it into electrical energy through the semiconductor thermocouple, thereby absorbing and discharging battery heat energy and collecting energy; while the heat continues to increase sharply, the semiconductor refrigeration module can be started, and the battery module can be cooled rapidly through electrical energy refrigeration to stabilize the temperature inside the battery pack.

[0040] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An intelligent thermal management battery pack cooling system, characterized in that: The invention comprises a thermoelectric power generation module, a semiconductor refrigeration module and an electronic control module, wherein the heat absorption end of the thermoelectric power generation module and the cooling end of the semiconductor refrigeration module are respectively connected to the battery module; the electronic control module is connected to the thermoelectric power generation module and the semiconductor refrigeration module to realize dynamic control of the thermoelectric power generation module and the semiconductor refrigeration module; the thermoelectric power generation module comprises a first heat conduction plate, wherein the first heat conduction plate is connected to one end of two different semiconductor materials, and the other ends of the two different semiconductor materials are respectively connected to a second heat conduction plate and a third heat conduction plate, and the second heat conduction plate and the third heat conduction plate are electrically connected to the positive and negative electrodes of the battery; the semiconductor refrigeration module comprises a first guide bar, a second guide bar and a third guide bar, wherein the first guide bar is connected to one end of two different semiconductor materials, and the other ends of the two different semiconductor materials are respectively connected to the second guide bar and the third guide bar, and the two end wires of the second guide bar and the third guide bar are connected to the positive and negative electrodes of the power supply.

2. The intelligent thermal management battery pack cooling system according to claim 1, characterized in that: It also includes a first summary guide plate and a second summary guide plate, wherein the first summary guide plate is connected to multiple groups of the first heat conduction plates, the second summary guide plate is connected to multiple groups of the second heat conduction plates and the third heat conduction plates, and both ends of the second summary guide plate are electrically connected to the positive and negative electrodes of the battery.

3. The intelligent thermal management battery pack cooling system according to claim 1, characterized in that: It also includes a third aggregation wire and a fourth aggregation wire, the third aggregation wire connects multiple groups of the first guide bars, the fourth aggregation wire connects multiple groups of the second guide bars and the third guide bar, and both ends of the fourth aggregation wire are electrically connected to the positive and negative poles of the power supply.

4. A battery pack with intelligent thermal management, characterized in that: It comprises a box assembly, a battery module, a control detection system and the battery pack cooling system according to any one of claims 1 to 3; the heat absorption end of the temperature difference power generation module and the cooling end of the semiconductor refrigeration module of the battery pack cooling system are respectively connected to the battery module, and the battery module and the battery pack cooling system are integrated in the box assembly.

5. The battery pack with intelligent thermal management according to claim 4, characterized in that: A heat sink aluminum sheet is arranged below the battery module, and the cells of the battery module are in contact with the heat sink aluminum sheet. The heat sink aluminum sheet is connected below the heat absorption end of the temperature difference power generation module and the cooling end of the semiconductor refrigeration module.

6. The battery pack with intelligent thermal management according to claim 4, characterized in that: The heat absorption end of the thermoelectric power generation module and the cooling end of the semiconductor refrigeration module are evenly arranged alternately and connected to the battery modules respectively. A heat insulation device is arranged between the heat absorption end of the thermoelectric power generation module and the cooling end of the semiconductor refrigeration module.

7. The battery pack with intelligent thermal management according to claim 4, characterized in that: The cold end of the temperature difference power generation module and the hot end of the semiconductor refrigeration module are evenly spaced apart, and a heat insulation device and an insulating device are arranged between the cold end of the temperature difference power generation module and the hot end of the semiconductor refrigeration module, and are respectively attached to the bottom of the box body of the box body assembly to conduct heat to the outside of the battery system.

8. The battery pack with intelligent thermal management according to claim 4, characterized in that: The power supply is an external direct current or a battery power supply.

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