A battery heating sheet with uneven heating, an intelligent thermal management device and a method

Abstract

The present invention relates to a battery heating plate with uneven heating, an intelligent thermal management device and a method. The battery heating plate with uneven heating includes at least two power density areas with different heating powers, a heating plate connecting line connected to the multiple power density areas, and a connector. It also relates to an intelligent thermal management device for a battery with uneven heating, which includes a plurality of the heating plates, each heating plate is placed corresponding to each heating area, a temperature acquisition controller, and a sensor in a battery pack, wherein the temperature acquisition controller is connected to the connector on each heating plate through a corresponding heating line; the sensor in the battery pack is connected to the temperature acquisition controller; and a heating power supply is connected to the temperature acquisition controller. It also relates to an intelligent thermal management method for a battery with uneven heating, which adopts the above-mentioned intelligent thermal management device for a battery with uneven heating to adjust the on / off of each heating plate according to a temperature threshold.

Description

Technical Field

[0001] The present invention relates to the technical field of battery thermal management, and in particular to a battery heating sheet for uneven heating, an intelligent thermal management device and a method. Background Art

[0002] Since the power battery of the prior art has no advantage in low temperature resistance, especially in the low temperature environment in winter, the cruising range of electric vehicles decreases significantly. Winter cruising range is one of the core indicators of the user experience of the whole vehicle. The low temperature performance of the battery system is the core competitiveness of the battery manufacturer. Uneven temperature will also aggravate the inconsistency of the battery and shorten its life. Therefore, a heating system that can heat the battery evenly and with a small temperature difference is essential. The existing power battery low temperature heating system is mainly low temperature charging heating, that is, when the electric vehicle is charged in a low temperature environment, the power battery is first heated to a minimum temperature greater than 0°C, and then charged. The start of heating is determined by the minimum temperature. The heating system is not divided into regions. When the heating is turned on, all positions start heating at the same time, and it is impossible to ensure that the temperature difference inside the battery system is small. In the prior art, the heating area is not controlled by the zone. When charging low temperature heating, the heating will be turned on multiple times for one charge. The heat dissipation and heat preservation conditions of the battery system are different. When the temperature of the place with good heat dissipation is less than 0°C, when the heating is turned on again, the temperature of the place with poor heat dissipation will gradually accumulate, and finally the temperature difference inside the battery system will gradually increase. The heating plate in the prior art is uniform, and the part that is not in direct contact with the battery will continue to dry burn when the heating is turned on. It cannot transfer heat to the battery in time, and the local temperature will overheat. It may even cause the temperature sensor to misjudge. The actual battery temperature has not reached the target temperature, but the temperature sensor has detected the target temperature. Low-temperature charging of the battery will cause irreversible damage. Summary of the invention

[0003] In order to solve the technical problem that the parts that are not in direct contact with the battery will continue to dry burn when the heating is turned on, and the heat cannot be transferred to the battery in time, the local temperature will be overheated, and it may even cause misjudgment of the temperature sensor. The actual battery temperature has not reached the target temperature, but the temperature sensor has detected the target temperature, and the low-temperature charging of the battery will cause irreversible damage, the present invention provides a battery heating plate with uneven heating, an intelligent thermal management device and a method.

[0004] The present invention provides a battery heating sheet with uneven heating, comprising at least two power density areas with different heating powers, a heating sheet connecting line connected to the multiple power density areas, and a connector; the at least two different heating powers include: a first power density area and a second power density area, and the heating power of the first power density area is greater than the heating power of the second power density area.

[0005] The beneficial effects of the present invention are as follows: the power density of the heating plate is uneven, and it is composed of different power areas. The high power density area is in direct contact with the battery pack, and heat is conducted to heat the battery cell. The low power density area prevents the dry burning temperature of the part that is not in direct contact with the heat conduction from being too high, damaging adjacent components, and at the same time plays a role in keeping the battery pack warm.

[0006] Furthermore, the first power density region and the second power density region respectively include a plurality of regions and are cross-distributed.

[0007] A further effect of the above is that the cross-distribution of different areas is conducive to the conduction of heat and facilitates the diffusion of heat in the dry burning part.

[0008] Furthermore, the thickness of the first power density region is greater than the thickness of the second power density region.

[0009] A further effect of the above is that the thickness of the different power density regions directly and simply distinguishes the power density of the different regions.

[0010] Furthermore, the first power density region is used to directly heat the battery, and the second power density region is used to indirectly heat the battery.

[0011] A further effect of the above is that the heating sheet heats the battery in two different ways to meet different heating requirements of the battery.

[0012] Furthermore, the first power density region has a power density of not less than 0.15 W / cm 2 The second power density region is a region where the power density is less than 0.15 W / cm 2 area; the power density is determined by the arrangement density of the heating wire.

[0013] The above further effects: provides a way to divide different power density areas, greater than 0.15W / cm 2 The power density area can efficiently and quickly heat the battery directly, less than 0.15W / cm 2 The power density area can avoid overheating caused by dry burning.

[0014] Furthermore, each heating plate is also connected to a temperature sensor, and a data line of the temperature sensor is connected to the connector.

[0015] The above further effects: the temperature sensor can detect the temperature and heating status of the heating plate in real time, which is convenient for monitoring the temperature and operation of the heating plate during operation, and overheating and insufficient temperature can be discovered in time.

[0016] The present invention also provides a battery intelligent thermal management device with uneven heating, comprising a plurality of the heating plates, each heating plate being placed corresponding to each heating area, a temperature acquisition controller, and a sensor inside a battery pack, wherein the temperature acquisition controller is connected to a connector on each of the heating plates through a corresponding heating wire; the sensor inside the battery pack is connected to the temperature acquisition controller; and a heating power supply is connected to the temperature acquisition controller.

[0017] The beneficial effects of the present invention are as follows: a plurality of independently working heating plates are arranged at different positions of the battery, and different heating controls can be performed according to the heat dissipation conditions and temperature requirements of different positions of the battery in a low-temperature environment.

[0018] Furthermore, it also includes: a temperature control module, which is used to adjust the on / off of the heating plate corresponding to each temperature sensor according to the data of the multiple temperature sensors.

[0019] The above further effects: the temperature acquisition controller can control the opening and closing of the heating plates of multiple temperature sensors through the temperature control module to prevent the heating plates from overheating and accelerating the aging of surrounding components; or in abnormal circumstances, prevent the heating plates from continuing to heat and improve safety.

[0020] The present invention also provides a method for intelligent thermal management of a battery with uneven heating, which uses the above-mentioned intelligent thermal management device for a battery with uneven heating to adjust the on / off of each heating plate according to a temperature threshold.

[0021] The beneficial effects of the present invention are as follows: the temperature collection and control module can collect data based on the temperature sensors arranged in the battery pack and the heating plate, and intelligently drive the switch to connect or disconnect the circuit of the required control area. When it is detected that the temperature is low somewhere in the battery pack, the circuit of the corresponding area is connected for heating; when it is detected that the temperature is high somewhere in the battery pack, the circuit of the corresponding area is disconnected for insulation, thereby keeping the temperature difference in the battery pack within a very small range in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a battery heating sheet with uneven heating provided by an embodiment of the present invention;

[0023] Figure 2 One of the schematic diagrams of a battery intelligent thermal management device with uneven heating provided by an embodiment of the present invention;

[0024] Figure 3 A second schematic diagram of a battery intelligent thermal management device with uneven heating provided by an embodiment of the present invention;

[0025] Figure 4 The third schematic diagram of a battery intelligent thermal management device with uneven heating provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In the following description, specific details such as specific system structures, interfaces, and technologies are provided for illustration rather than limitation in order to provide a thorough understanding of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0027] Figure 1 A battery heater for uneven heating provided in an embodiment of the present invention comprises at least two different heating power density areas, a heating plate connecting line 4 connected to the multiple power density areas, and a connector 5; the at least two different heating powers include: a first power density area and a second power density area, and the heating power of the first power density area is greater than the heating power of the second power density area, and the first power density area is Figure 1 Medium and high power density area 1, the second power density area is Figure 1 The middle and high power density area 2, the junction of the first power density area and the second power density area of ​​the heating plate is connected to the connecting wire 4 through the heating wire package 3. The connector 5 can be connected to an external power supply control device.

[0028] In the prior art, the heating plate is uniform, and the part that is not in direct contact with the battery will continue to dry burn when the heating is turned on. It cannot transfer heat to the battery in time, and the local temperature will overheat. It may even cause the temperature sensor to misjudge. The actual battery temperature has not reached the target temperature, but the temperature sensor has detected the target temperature. Charging the battery at low temperature will cause irreversible damage.

[0029] The present invention provides a battery heating sheet with uneven heating. Through the above-mentioned setting, different power areas are distinguished. The high power density area is in direct contact with the battery pack, and heat conduction heats the battery cell. The low power density area prevents the dry burning temperature of the part not in direct contact with the heat conduction from being too high, thereby damaging adjacent components, and at the same time plays a role in heat preservation in the battery pack.

[0030] Based on the above embodiments, the present invention provides a battery heating sheet with uneven heating, further comprising: each heating sheet is also connected to a temperature sensor, and the data line of the temperature sensor is connected to the connector. The temperature sensor can detect the temperature and heating state of the heating sheet in real time, which is convenient for monitoring the temperature and operation of the heating sheet during operation, and timely discovering overheating and insufficient temperature.

[0031] Based on the above embodiments, the present invention provides a battery heating sheet for uneven heating, optionally: the first power density area and the second power density area respectively include a plurality of areas, and are cross-distributed; the thickness of the first power density area is greater than the thickness of the second power density area; the first power density area is used to directly heat the battery, and the second power density area is used to indirectly heat the battery; the power density of the first power density area is not less than 0.15W / cm 2 The second power density region is a region where the power density is less than 0.15 W / cm 2 area; the power density is determined by the arrangement density of the heating wire.

[0032] like Figure 2 , Figure 3 As shown, based on the above embodiment, a battery intelligent thermal management device with uneven heating includes a plurality of the above heating plates, each of which is placed corresponding to each heating area 6, a temperature acquisition controller 11, and the temperature acquisition controller 11 is connected to the connector 5 on each of the above heating plates 8 through the corresponding heating wire 7; the battery pack internal sensor 13 is connected to the temperature acquisition controller 11; and the heating power supply 10 is connected to the temperature acquisition controller 11. The above structures are all arranged in the box 9.

[0033] In the prior art, the heating start of the battery heating device is mainly determined by the minimum temperature. When the heating system is turned on, all positions are heated simultaneously, which may cause local temperature overheating and may also cause misjudgment of the temperature sensor, causing irreversible damage to the battery.

[0034] An embodiment of the present invention provides a battery intelligent thermal management device with uneven heating. Through the above-mentioned configuration, different areas of the battery can be heated and the temperature can be detected separately, and heating and stopping of heating can be controlled according to the temperature of the battery and the temperature of the heating plate, thereby avoiding local overheating of the battery, excessive temperature difference, and damage to the battery heating.

[0035] like Figure 4 As shown, based on the above embodiments, a battery intelligent thermal management device with uneven heating provided by the present invention further includes a temperature control module for adjusting the on / off of the heating plate corresponding to each temperature sensor according to the data of the multiple temperature sensors; and a temperature acquisition module for reading the values ​​of each sensor.

[0036] The embodiment of the present invention also provides a battery intelligent thermal management method for uneven heating, which uses the above-mentioned battery intelligent thermal management device for uneven heating to adjust the opening / closing of each heating plate according to the temperature threshold. The temperature acquisition module detects the temperature of different areas of the battery through the sensor inside the battery. If the battery temperature is lower than the temperature threshold, the temperature control module supplies power to the heating plate on the heating area of ​​the corresponding battery area, turns on the heating mode, and monitors the temperature of the heating plate in real time through the sensor 15 inside the heating plate. If the temperature of the heating plate is too high or does not work, an alarm is issued; if the temperature inside the battery reaches the temperature threshold, the heating plate stops working.

[0037] The reader should understand that in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0038] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A battery heater with uneven heating, characterized in that: The device comprises at least two power density areas with different heating powers, a heating plate connecting line connected to the multiple power density areas, and a connector; the at least two different heating powers include: a first power density area and a second power density area, and the heating power of the first power density area is greater than the heating power of the second power density area; The junction of the first power density area and the second power density area of ​​the heating plate is connected to the connecting wire through a heating wire package, and the connector is connected to an external power supply control device; The first power density region and the second power density region respectively include a plurality of regions and are cross-distributed; The thickness of the first power density region is greater than the thickness of the second power density region; The first power density area is in direct contact with the battery pack and is used to directly heat the battery. The second power density area is used to indirectly heat the battery to prevent the part that is not in direct contact with the heat conduction from being dry-burned and having an excessively high temperature.

2. The battery heating sheet according to claim 1, characterized in that: The first power density region has a power density of not less than 0.15 W / cm 2 The second power density region is a region where the power density is less than 0.15 W / cm 2 area; The power density is determined by the arrangement density of the heating wires.

3. The battery heating sheet according to claim 1, characterized in that: Each heating plate is also connected to a temperature sensor, and a data line of the temperature sensor is connected to the connector.

4. A battery intelligent thermal management device with uneven heating, characterized in that: It includes a plurality of heating plates as claimed in claim 3, each heating plate is placed corresponding to each heating area, a temperature acquisition controller, a sensor in the battery pack, The temperature acquisition controller is connected to the connector on each of the heating plates through a corresponding heating wire; The sensor in the battery pack is connected to the temperature acquisition controller; A heating power supply is connected to the temperature acquisition controller.

5. The battery intelligent thermal management device according to claim 4, characterized in that: Also includes: The temperature control module is used to adjust the opening and closing of the heating plate corresponding to each temperature sensor according to the data of the multiple temperature sensors.

6. A battery intelligent thermal management method for uneven heating, characterized in that: By using the device described in claim 4 or 5, the opening and closing of each heating plate is adjusted according to the temperature threshold.

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