Partitioned heating system for power battery pack of unmanned aerial vehicle and unmanned aerial vehicle

Abstract

The utility model discloses an unmanned aerial vehicle power battery pack partition heating system and an unmanned aerial vehicle. The heating system comprises a plurality of heating mechanisms which are respectively arranged in a plurality of heating areas in the battery pack, and each heating mechanism is used for heating at least one battery cell in the corresponding heating area; a plurality of temperature monitoring mechanisms, each of which is used for monitoring the temperature in the corresponding heating zone and outputting a corresponding monitoring signal; and the battery management module is respectively connected with the plurality of heating mechanisms and the temperature monitoring mechanism, and is used for regulating and controlling the working state of the corresponding heating mechanism according to the monitoring signal output by each temperature monitoring mechanism, so that the temperatures of the plurality of battery cells are all in a set temperature range. According to the utility model, the temperature of each battery cell in the battery pack can be relatively safe and uniform, and particularly, each battery cell is at the optimal working temperature to the greatest extent, so that the charging and discharging efficiency of the battery is remarkably improved, and the working time of the unmanned aerial vehicle is greatly prolonged.

Description

TECHNICAL FIELD

[0001] The application relates to a power battery pack of an unmanned aerial vehicle, in particular to a power battery pack partition heating control system of an unmanned aerial vehicle and the unmanned aerial vehicle, and belongs to the technical field of power batteries. TECHNICAL BACKGROUND

[0002] In the use scenario of the unmanned aerial vehicle, the performance of the battery pack is crucial. Especially when the unmanned aerial vehicle is in super high altitude flight, or is charging on the ground, the state of the battery pack will be affected by various factors.

[0003] Taking the unmanned aerial vehicle battery pack based on lithium batteries as an example, when the ambient temperature is lower than zero, according to the characteristics of lithium metal cells, charging operation is prohibited, because low-temperature charging will cause lithium precipitation phenomenon, which will cause irreversible damage to the battery. Moreover, the charging and discharging efficiency of lithium metal batteries is different at different temperature environments.

[0004] The existing unmanned aerial vehicle battery pack generally adopts the whole battery heating mode. However, this technical solution has obvious defects. Since the battery pack contains a large number of cells, whole battery heating cannot guarantee that the temperature of all cells inside the battery pack is in a relatively stable and unified range. This makes the temperature of cells in different regions of the whole battery pack have a large difference, which further leads to a significant difference in the charging and discharging efficiency of cells in different regions of the whole battery pack, and finally causes the overall charging and discharging efficiency of the battery pack to be greatly reduced, and the normal working time of the unmanned aerial vehicle is much shorter than the theoretical working time. CONTENT OF THE UTILITY MODEL

[0005] The main purpose of the application is to provide a power battery pack partition heating system of an unmanned aerial vehicle and the unmanned aerial vehicle, so as to overcome the shortcomings of the prior art.

[0006] In order to achieve the above-mentioned application purposes, the application provides the following technical solutions.

[0007] One aspect of the application provides a power battery pack partition heating system of an unmanned aerial vehicle, which comprises:

[0008] A plurality of heating mechanisms are arranged in a plurality of heating zones in the battery pack, wherein each heating mechanism is used for heating at least one cell in the corresponding heating zone;

[0009] A plurality of temperature monitoring mechanisms are connected with the battery pack, wherein each temperature monitoring mechanism is used for monitoring the temperature in the corresponding heating zone and outputting a corresponding monitoring signal;

[0010] A battery management module is connected with the heating mechanisms and the temperature monitoring mechanisms respectively, and is configured to control the working state of each heating mechanism according to the monitoring signal output by each temperature monitoring mechanism, so that the temperature of the battery cells in each heating zone is within the set temperature range.

[0011] In one embodiment, the heating mechanism comprises an electrothermal film attached to the surface of the battery cell.

[0012] Further, two or more battery cells are arranged in each heating zone, and the surfaces of two adjacent battery cells are attached to the opposite sides of an electrothermal film respectively.

[0013] Further, the electrothermal film is attached to the surface of the battery cell by a low-temperature-resistant heat-conducting double-sided adhesive.

[0014] In one embodiment, the heating zones are arranged in sequence from the inside to the outside of the battery pack.

[0015] Further, each heating zone is provided with a heating mechanism group, each heating mechanism group comprises a plurality of heating mechanisms arranged in series, and the heating mechanism groups are arranged in parallel.

[0016] Further, the heating zone is a ring-shaped area.

[0017] In one embodiment, the heating mechanisms are electrically connected with one or more battery cells.

[0018] In one embodiment, the temperature monitoring mechanisms are electrically connected with one or more battery cells.

[0019] In one embodiment, the battery pack comprises a battery box and one or more battery modules, the battery module comprises a plurality of battery cells; the heating mechanisms, the temperature monitoring mechanisms, the battery management module and the battery module are arranged in the battery box.

[0020] Further, the battery pack comprises a plurality of battery modules arranged in an array, the heating mechanisms integrated in each battery module are arranged inside the battery module, and the temperature monitoring mechanisms arranged in each battery module are arranged on the top of the battery module.

[0021] Another aspect of the present application provides an unmanned aerial vehicle, comprising a UAV body and a battery pack arranged in the UAV body; the battery pack is provided with the UAV power battery pack partition heating system.

[0022] Compared with the prior art, the present application has at least the following advantages:

[0023] (1) By monitoring and heating the temperature of each battery cell in the power battery pack of the unmanned aerial vehicle, the temperature of each battery cell in the whole battery pack can be kept in a relatively safe and uniform state, so that the consistency of the whole battery pack is guaranteed, and the battery cells are kept at the best working temperature to the greatest extent, which effectively improves the charging and discharging efficiency of the battery pack and greatly prolongs the working time of the unmanned aerial vehicle.

[0024] (2) The power battery pack partition heating control system provided has simple structure, can fully utilize the internal space of the battery pack, does not need to greatly adjust the structure of the battery pack, and does not cause the overall weight of the battery pack to be significantly increased, so the influence on the self-load of the unmanned aerial vehicle is small. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 is a structural schematic diagram of a power battery pack and a partition heating system of an unmanned aerial vehicle in an embodiment of the present application;

[0027] Figure 2 is a combined structural schematic diagram of an electrothermal film and a battery cell in an embodiment of the present application;

[0028] Figure 3 is a schematic diagram of the arrangement of multiple heating zones in the battery pack in an embodiment of the present application.

[0029] Marked: 1, battery box; 2, battery module; 3, battery cell; 4, battery management system (BMS); 5, electrothermal film; 6, temperature sensor; 7, heat-conducting double-sided adhesive. DETAILED DESCRIPTION

[0030] The technical solutions of the present application will be described clearly and completely in combination with the drawings and embodiments, but the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0031] The present embodiment provides a power battery pack partition heating system of an unmanned aerial vehicle. As shown in Figures 1-3As shown, the power battery pack includes a battery box 1 and a plurality of battery modules 2, each of which includes a plurality of battery cells 3. The battery modules 2 are arranged in an array in the battery box 1. Generally, in an ultra-low temperature environment, the temperature change rate is different in different areas close to the outer edge of the battery box 1 and the center of the battery pack, so the space in the battery pack can be divided into a plurality of heating zones from inside to outside. Further, by respectively providing heating mechanisms and temperature monitoring mechanisms for each heating zone, and connecting the heating mechanisms and temperature monitoring mechanisms with the battery management module and controlling them by the battery management module, a heating system of the embodiment is formed for regulating the temperature of the battery cells at different positions in the battery pack. The battery management module can be directly integrated into the battery management system 4.

[0032] More specifically, the heating system of the embodiment includes a plurality of heating mechanisms and a plurality of temperature monitoring mechanisms. The heating mechanisms preferably use electric heating films 5, in particular electric heating films based on lightweight materials such as carbon nanotubes and graphene. The temperature monitoring mechanisms can use temperature sensors 6, in particular micro temperature sensors, to reduce the impact on the overall weight of the battery pack. The aforementioned plurality of electric heating films can be respectively arranged in the aforementioned heating zones, and each electric heating film is used to heat one or more battery cells in a corresponding heating zone. As a more preferred solution, each two adjacent battery cells can share an electric heating film. The electric heating film is single-sidedly glued, and considering the low-temperature application environment, a heat-conducting double-sided adhesive tape 7 with good low-temperature resistance can be used to strengthen the bonding strength between the electric heating film and the battery cells. Each electric heating film can be integrally arranged inside the corresponding battery module, and can adopt a double-sided top terminal wire-out structure to fully utilize the internal space of the battery pack and facilitate connection with the battery management module, and simplify the heating circuit structure. The aforementioned plurality of temperature sensors are preferably arranged inside the battery pack, in particular can be placed on the high-voltage series busbars of the battery modules and arranged at the top of each battery module, so as to reduce the adjustment of the internal structure of the battery pack and fully utilize the internal space of the battery pack. By using each temperature sensor, the temperature in each heating zone can be monitored in real time or periodically, and the corresponding monitoring signals can be output in time. The battery management module can regulate the working state of each electric heating film according to the monitoring signals output by each temperature sensor, so that the temperature of the battery cells in the plurality of heating zones is within the set temperature range. The set temperature range is preferably the optimal working temperature range of the battery cells.

[0033] In the embodiment, the aforementioned electric heating films, temperature sensors, and battery management module are electrically connected with the battery cells in the battery pack, and the battery pack is used as a driving power supply.

[0034] In the embodiment, a plurality of electric heating films in the same heating zone can be arranged in series to form a heating mechanism group (also referred to as a heating loop), and a plurality of heating mechanism groups can be arranged in parallel, so that each heating mechanism group can be controlled by the battery management module.

[0035] Furthermore, the battery management module in the embodiment can return temperature data through the temperature sensors arranged in different regions inside the battery pack, and heat each region by controlling different heating loops, so as to minimize the temperature difference between each region inside the battery pack, maximize the working temperature of each region inside the battery pack, and effectively improve the charging and discharging efficiency of the battery pack, significantly prolong the service life of the battery, and further greatly increase the normal working time of the unmanned aerial vehicle.

[0036] For example, please continue to refer to Figure 1 and Figure 3 The battery pack in the embodiment can include six battery modules, one of which includes nine battery cells, and 10 electric heating films are arranged inside. The remaining five battery modules include ten battery cells, and 11 electric heating films are arranged in each battery module. Each electric heating film is arranged between the corresponding two battery cells.

[0037] At the same time, the internal space of the battery pack can be divided into four heating zones in the direction from inside to outside, namely heating zone one, heating zone two, heating zone three and heating zone four. The heating zone one is provided with 12 electric heating films (the first and third layers from the outside to the inside), each electric heating film has a voltage of 21.7V, a power of 7W and a resistance of 67.3Ω. The heating zone two is provided with 6 electric heating films (the second layer from the outside to the inside), each electric heating film has a voltage of 43.3V, a power of 4.17W and a resistance of 449.6Ω. The heating zone three is provided with 12 electric heating films (the first and second layers from the inside to the outside), each electric heating film has a voltage of 21.7V, a power of 5.5W and a resistance of 85.6Ω. The heating zone four is provided with 35 electric heating films, each electric heating film has a voltage of 7.43V, a power of 5.5W and a resistance of 10Ω.

[0038] The plurality of electric heating films in each heating zone are connected in series to form a heating loop. Figure 3 The thick solid line shows the wire bundle direction of the heating loop in the heating zone one, the thin dotted line shows the wire bundle direction of the heating loop in the heating zone two, the thick and thin dotted line shows the wire bundle direction of the heating loop in the heating zone three, and the thin solid line shows the wire bundle direction of the heating loop in the heating zone four.

[0039] In the ultra-low temperature environment, the temperature drop speed of each heating area of the battery pack is different, when a temperature sensor detects that the internal temperature of the corresponding heating area is lower than the set temperature threshold (for example, 0 DEG C), the battery management module controls the heating circuit in the heating area to work to heat, and synchronously opens the heating circuit in other heating areas, the battery management module analyzes the temperature data returned by each temperature sensor, controls the on-off and heating power of each heating circuit in the battery pack, so that the temperature of each area in the battery pack is kept consistent to the maximum extent and within the safe working range of the battery cell.

[0040] The embodiments of the present application are described above in conjunction with the drawings, but the present application is not limited to the specific embodiments described above, and the specific embodiments described above are only illustrative, but not restrictive, and those skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims.

Claims

1. A zoned heating system for a power battery pack of an unmanned aerial vehicle, characterized in that, include: Multiple heating mechanisms are respectively arranged in multiple heating zones within the battery pack, wherein each heating mechanism is used to heat at least one cell in a corresponding heating zone; Multiple temperature monitoring units are connected to the battery pack, wherein each temperature monitoring unit is used to monitor the temperature in a corresponding heating zone and output a corresponding monitoring signal; The battery management module is connected to multiple heating mechanisms and multiple temperature monitoring mechanisms respectively, and is used to adjust the working state of a corresponding heating mechanism according to the monitoring signal output by each temperature monitoring mechanism, so that the cell temperature in multiple heating zones is within the set temperature range.

2. The unmanned aerial vehicle power battery pack zone heating system according to claim 1, characterized in that: The heating mechanism includes an electrothermal film, which is attached to the surface of the battery cell.

3. The unmanned aerial vehicle power battery pack zone heating system according to claim 2, characterized in that: Each heating zone is provided with two or more battery cells, wherein the surfaces of two adjacent battery cells are respectively attached to the opposite sides of an electrothermal film.

4. The unmanned aerial vehicle power battery pack zone heating system according to claim 3, characterized in that: The heating film is attached to the surface of the battery cell using low-temperature resistant, thermally conductive double-sided adhesive.

5. The unmanned aerial vehicle power battery pack zone heating system according to claim 1, characterized in that: The multiple heating zones are distributed sequentially from the inside of the battery pack to the outside.

6. The unmanned aerial vehicle power battery pack zone heating system according to claim 5, characterized in that: Each heating zone is provided with a heating mechanism group, and each heating mechanism group includes multiple heating mechanisms arranged in series, and the multiple heating mechanism groups are arranged in parallel. And / or, the heating zone is an annular region.

7. The unmanned aerial vehicle power battery pack zone heating system according to claim 1, characterized in that: The plurality of heating mechanisms are electrically connected to one or more of the battery cells; and / or, the plurality of temperature monitoring mechanisms are electrically connected to one or more of the battery cells.

8. The unmanned aerial vehicle power battery pack zone heating system according to claim 1, characterized in that: The battery pack includes a battery housing and one or more battery modules, each battery module comprising multiple battery cells; multiple heating mechanisms, multiple temperature monitoring mechanisms, a battery management module, and the battery modules are all housed within the battery housing.

9. The unmanned aerial vehicle power battery pack zone heating system according to claim 8, characterized in that: The battery pack includes multiple battery modules arranged in an array, with multiple heating mechanisms integrated inside each battery module and a temperature monitoring mechanism installed on top of each battery module.

10. An unmanned aerial vehicle (UAV), comprising an UAV body and a battery pack disposed within the UAV body; characterized in that: The battery pack is equipped with a partitioned heating system for the unmanned aerial vehicle power battery pack as described in any one of claims 1-9.

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