阅读说明：本技术 动力电池加热系统及其加热方法 (Power battery heating system and heating method thereof ) 是由 徐晓明 洪吉超 赤骋 李仁政 张伟 丁华 于 2021-06-08 设计创作，主要内容包括：本发明公开了一种动力电池加热系统及其加热方法,该系统包括：动力电池箱内部设置有加热膜,加热膜用于通电后产生热量对动力电池系统进行加热；温度传感器设置于动力电池箱内部的电芯单体上,用于测量电芯的温度；外接电源与加热膜连接,用于为加热膜供电；控制器与加热膜、温度传感器和外接电源连接,用于根据温度传感器测量的温度生成控制指令。通过加热膜进行加热可以实现低温下动力电池系统快速智能均匀加热,并且可以精确至电芯单体级别的温度控制,确保温度一致性,附加加热系统后原电池系统质量能量密度无损,在电芯单体和箱体外壳上设置加热膜,结构简单,便于布置,成本低。(The invention discloses a power battery heating system and a heating method thereof, wherein the system comprises: a heating film is arranged in the power battery box and used for generating heat to heat the power battery system after being electrified; the temperature sensor is arranged on the battery cell monomer inside the power battery box and used for measuring the temperature of the battery cell; the external power supply is connected with the heating film and used for supplying power to the heating film; the controller is connected with the heating film, the temperature sensor and the external power supply and used for generating a control instruction according to the temperature measured by the temperature sensor. The heating film is used for heating, so that the power battery system can be rapidly, intelligently and uniformly heated at low temperature, the temperature can be accurately controlled to the level of the battery cell monomer, the temperature consistency is ensured, the mass energy density of the original battery system is not damaged after the heating system is attached, the heating film is arranged on the battery cell monomer and the box body shell, the structure is simple, the arrangement is convenient, and the cost is low.)

1. A power cell heating system, comprising: the device comprises a power battery, a controller, an external power supply and a temperature sensor;

a heating film is arranged in the power battery box and used for generating heat after being electrified to heat the power battery system;

the heating film is made of a metal oxide semiconductor heating material MOSH;

the temperature sensor is arranged on the battery cell monomer in the power battery box and used for measuring the temperature of the battery cell;

the external power supply is connected with the heating film and used for supplying power to the heating film;

the controller is connected with the heating film, the temperature sensor and the external power supply and used for generating a control instruction according to the temperature measured by the temperature sensor.

2. The system of claim 1, wherein the heating film comprises a substrate layer, a heating layer and a waterproof layer, the substrate layer is coated with a metal oxide semiconductor heating material MOSH film to form the heating layer, the heating layer is attached with the waterproof layer, the heating layer is led out with a positive electrode and a negative electrode to be connected with an external power supply, and heat is generated after the heating layer is electrified.

3. The system of claim 1, wherein the heating film is attached to the surface of each cell monomer inside the power battery box and/or the inner surface of the power battery shell.

4. The system of claim 1, wherein the controller is further configured to adjust the energization time and the energization intensity of the heating film to control the heating rate and the maximum heating temperature of the power cell box.

5. The system of claim 1, wherein the temperature sensor is disposed on each cell in the power battery box for measuring a temperature of each cell.

6. The system of claim 5, wherein the controller is further configured to adjust a heating power of the heating film on each cell according to the temperature of each cell.

7. The system of claim 3, wherein the controller is further configured to energize only the heating film on the power cell box housing.

8. The system of claim 1, wherein the external power source includes, but is not limited to, lead acid batteries and solar cells.

9. A heating method for the power battery heating system according to claims 1-8, comprising the steps of:

collecting the temperature of each single battery cell in the power battery box;

when the temperature of the battery cell monomers is lower than the preset temperature, each battery cell monomer is heated through the heating film until each battery cell monomer in the power battery reaches the preset temperature.

10. The method of claim 9, further comprising:

and determining a heating mode of each battery cell through the temperature of each battery cell in the power battery box, wherein the heating mode comprises the electrifying time and the electrifying intensity of each battery cell.

Technical Field

The invention relates to the technical field of low-temperature heating, in particular to a power battery heating system and a heating method thereof.

Background

The power battery system is used as a power source of the new energy vehicle, and the working performance of the power battery system directly influences the power performance of the whole vehicle. The lithium ion battery has different charge and discharge performances at different temperatures, and the performance of the battery is reduced in a high-temperature and high-cold environment, so that the instantaneous charge and discharge power and the charge and discharge electric quantity of the battery are influenced, the instantaneous dynamic property and the final driving range of the whole vehicle are influenced, and in addition, the service life of the battery can be greatly influenced when the battery works in the high-temperature and high-cold environment for a long time. The existing heating modes are divided into an internal heating mode and an external heating mode.

External heating: the external heating mainly heats the heat transfer medium (air, liquid or phase change material) by means of an external heat source, and then heats the battery by means of heat radiation, heat convection or heat conduction. The technical difficulty and the cost of the method are lower, but a large amount of space needs to be reserved in the battery pack box body to be used as a gas flow channel, so that the compactness of the whole pack structure is reduced; although the heating efficiency of the battery heating method based on the liquid medium is high, the auxiliary equipment is more, the structural design is complex, the cost is high, and potential safety hazards such as sealing and insulation exist at the same time. In addition, the existing heating mode cannot accurately adjust the heating power aiming at the actual temperature of each battery cell, and can only adjust the total heating power to a certain extent, so that the temperature consistency of the battery cells in the system is poor when the heating is completed.

Internal heating: the internal heating method is to heat the power battery by joule heat generated by passing current through a conductor with a certain resistance value, wherein the conductor is the power battery. The method can be divided into a charging heating method, a discharging heating method and an alternating current excitation heating method according to the positive and negative flow directions of current; according to different power supplies for supplying current, the method can be divided into self-loss heating and external energy supply heating, but the structure of a power battery monomer needs to be greatly changed, so that the energy density of the battery is reduced to a certain extent, and higher energy consumption exists.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, the invention aims to provide a power battery heating system, which can realize quick and uniform intelligent heating and heat preservation of a power battery system at low temperature.

Another objective of the present invention is to provide a heating method for a power battery heating system.

In order to achieve the above object, an embodiment of the invention provides a power battery heating system, including: the device comprises a power battery, a controller, an external power supply and a temperature sensor;

a heating film is arranged in the power battery box and used for generating heat after being electrified to heat the power battery system;

the heating film is made of a metal oxide semiconductor heating material MOSH;

the temperature sensor is arranged on the battery cell monomer in the power battery box and used for measuring the temperature of the battery cell;

the external power supply is connected with the heating film and used for supplying power to the heating film;

the controller is connected with the heating film, the temperature sensor and the external power supply and used for generating a control instruction according to the temperature measured by the temperature sensor.

According to the power battery heating system provided by the embodiment of the invention, the heating films are arranged on the battery cell monomer and the shell in the power battery box, so that heat is generated after the heating films are electrified, the power battery is heated, and the normal use of the power battery system in a low-temperature environment can be ensured. The heating film is used for heating, so that the power battery system can be rapidly, intelligently and uniformly heated at low temperature, the temperature can be accurately controlled to the level of the battery cell monomer, the temperature consistency is ensured, the mass energy density of the original battery system is not damaged after the heating system is attached, the heating film is arranged on the battery cell monomer and the box body shell, the structure is simple, the arrangement is convenient, and the cost is low.

In addition, the power battery heating system according to the above embodiment of the present invention may also have the following additional technical features:

furthermore, the heating film comprises a substrate layer, a heating layer and a waterproof layer, wherein the substrate layer is coated with a layer of metal oxide semiconductor heating material MOSH film to form the heating layer, the waterproof layer is attached to the heating layer, a positive electrode and a negative electrode are led out from the heating layer to be connected with an external power supply, and heat is generated after the heating layer is electrified.

Further, the heating film is attached to the surface of each battery cell monomer inside the power battery box and/or the inner surface of the shell of the power battery box.

Further, the controller is further used for adjusting the electrifying time and the electrifying intensity of the heating film to control the heating rate and the maximum heating temperature of the power battery box.

Further, the temperature sensor is arranged on each battery cell in the power battery box and used for measuring the temperature of each battery cell.

Further, the controller is further configured to adjust the heating power of the heating film on each cell according to the temperature of each cell.

Further, the controller is further used for electrifying only the heating film on the power battery box shell.

Further, the external power source includes, but is not limited to, a lead-acid battery and a solar battery.

In order to achieve the above object, another embodiment of the present invention provides a heating method for a power battery heating system, including:

collecting the temperature of each single battery cell in the power battery box;

when the temperature of the battery cell monomers is lower than the preset temperature, each battery cell monomer is heated through the heating film until each battery cell monomer in the power battery reaches the preset temperature.

According to the heating method of the power battery heating system, disclosed by the embodiment of the invention, the temperature of each battery cell in the power battery box is acquired; when the temperature of the battery cell monomers is lower than the preset temperature, each battery cell monomer is heated through the heating film until each battery cell monomer in the power battery reaches the preset temperature. The power battery system can realize quick, uniform and intelligent heating and heat preservation at low temperature.

In addition, the heating method of the power battery heating system according to the above embodiment of the present invention may further have the following additional technical features:

further, still include:

and determining a heating mode of each battery cell through the temperature of each battery cell in the power battery box, wherein the heating mode comprises the electrifying time and the electrifying intensity of each battery cell.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a power battery heating system according to an embodiment of the invention;

FIG. 2 is a diagram of a power cell configuration according to one embodiment of the present invention;

FIG. 3 is a diagram of a heating film structure according to one embodiment of the present invention;

FIG. 4 is a block diagram of a battery heating system housing according to one embodiment of the present invention;

fig. 5 is a flow chart of a heating method of the power battery heating system according to an embodiment of the invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The power battery heating system and the heating method thereof according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

First, a proposed power battery heating system according to an embodiment of the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a power battery heating system according to an embodiment of the invention.

As shown in fig. 1, the power battery heating system includes: power battery, controller, external power supply, temperature sensor.

The power battery box is internally provided with a heating film, and the heating film is used for heating the power battery system by heat generated after electrification.

The heating film is made of a metal oxide semiconductor heating material MOSH;

the temperature sensor is arranged on the battery cell monomer inside the power battery box and used for measuring the temperature of the battery cell.

The external power supply is connected with the heating film and used for supplying power to the heating film.

The controller is connected with the heating film, the temperature sensor and the external power supply and used for generating a control instruction according to the temperature measured by the temperature sensor.

The controller is further used for adjusting the electrifying time and the electrifying intensity of the heating film to control the heating rate and the maximum heating temperature of the power battery.

As shown in fig. 2 and 3, a square-shell type lithium ion battery is taken as an example to show the structure of the power battery.

The heating film comprises a base layer, a heating layer and a waterproof layer, wherein a layer of metal oxide semiconductor heating material MOSH is plated on the base layer to form the heating layer, the waterproof layer is attached to the heating layer, a positive electrode and a negative electrode are led out from the heating layer to be connected with an external power supply, and heat is generated after the heating layer is electrified.

Specifically, a metal oxide semiconductor heating Material (MOSH), which is a key functional material, is used. The heating film coated with MOSH material is disposed inside the power battery (in this embodiment, a square shell type lithium ion battery is taken as an example, but the base material of MOSH material is flexible and variable, such as plastic film, and therefore is not limited by the shape of the battery core), and two electrodes, which are positive and negative, are disposed on the film. When the heating membrane electrode is electrified, a large amount of heat can be generated due to the characteristics of the metal oxide semiconductor heating material and is used for rapidly and uniformly heating the battery, and meanwhile, the heating temperature on the surface of the heating membrane is consistent due to the uniform distribution of the MOSH material on the substrate material. Meanwhile, the heating film also has the advantages of no pollution, light weight, low cost and the like, and the arrangement mode is simple and convenient, and the internal composition structure of the battery is not required to be damaged or extra electrochemical reaction is not required to be initiated. The rate of temperature rise and the maximum temperature of heating during heating may be determined by the energization current and the energization time.

As an example, the method of manufacturing the heating film includes:

1) providing a substrate;

the present embodiment is a plastic film, but is not limited thereto, and other base materials may be used.

2) Polishing one surface of the substrate;

3) sputtering a target material on the surface of a substrate to carry out MOSH material coating to form a heating layer, and simultaneously arranging a positive electrode and a negative electrode;

4) and coating an insulating waterproof layer on the upper surface of the heating layer so as to form a heating film.

Specifically, the heating film of power battery box internal surface and the heating film of electric core surface parcel adopt the same kind of technology preparation, as shown in fig. 4, every heating film divide into three layer construction, total thickness is steerable to be 1mm, from last to being insulating waterproof layer down, generate heat the layer (MOSH material, thickness range is adjustable, be 1 ~ 800 mu m), the stratum basale (such as plastic film), it is one plus or minus to generate heat the layer and be provided with two electrodes, make the MOSH material generate heat through external power supply, the upper limit temperature that generates heat depends on the quantity of MOSH material, the size of the temperature that generates heat in use depends on supply voltage's size, adjust through external controller.

Further, the heating film is attached to the surface of each battery cell monomer inside the power battery box and/or the inner surface of the power battery shell. When heating, can heat electric core, also can heat power battery's casing simultaneously. When only heat preservation is needed, the heating film on the power battery shell can be electrified, so that the temperature of the power battery is kept within a certain range.

Further, a temperature sensor is arranged on each battery cell of the power battery and used for measuring the temperature of each battery cell.

The controller is further used for adjusting the heating power of the heating film on each battery cell according to the temperature of each battery cell.

Specifically, the temperature sensor is arranged inside the power battery box and used for detecting the temperature of the power battery. More specifically, a temperature sensor may be disposed on each battery cell in the power battery box, and the temperature of each battery cell is collected and sent to the controller. The controller may calculate the heating rate of each cell according to the temperature of each cell, thereby ensuring that the temperature of each cell is consistent.

Further, the electric energy required by the heating film is provided by an external power supply, the external power supply includes a lead-acid battery, and may also be a solar cell panel, and may also use other power supplies, and the embodiment of the present invention is not particularly limited.

In summary, in the power battery heating system according to the embodiment of the present invention, when the ambient temperature is low and affects normal use of the system, the heating controller is connected to an external power supply (a lead-acid battery is adopted in this embodiment, but not limited to such a power supply), and simultaneously adjusts and controls the power supply voltage to energize each electrical core and the heating film on the inner surface of the box body, so as to generate heat and rapidly heat the whole power battery system, and at the same time, a temperature sensor is disposed on the surface of each electrical core to monitor the temperature of each electrical core in real time, when an electrical core with too fast temperature rise or too high temperature occurs, the heating power of the heating film on the surface of the electrical core is reduced in a targeted manner, so as to keep the temperatures of the electrical cores in the whole system consistent, when the temperatures of all the electrical cores in the system reach suitable working temperatures, the power supply to the heating film on the inner surface of the box body of the system is stopped, and the heating film is continuously heated, the heating film on the inner surface of the box body works in a low heating power mode, so that the whole power battery system is maintained in a working temperature range to the minimum extent, and a heat preservation effect is achieved (the heating film on the inner surface of the box body and the heating film on the surface of the battery cell are not required to be completely covered, and the size and the arrangement position can be adjusted according to the actual use condition).

According to the power battery heating system provided by the embodiment of the invention, the heating films are arranged on the electric core monomer and the shell in the power battery box, and the power battery is heated by generating heat after the heating films are electrified. The power battery system can be ensured to be normally used in a low-temperature environment. The heating film is used for heating, so that the power battery system can be rapidly, intelligently and uniformly heated at low temperature, the temperature can be accurately controlled to the level of the battery cell monomer, the temperature consistency is ensured, the mass energy density of the original battery system is not damaged after the heating system is attached, the heating film is arranged on the battery cell monomer and the box body shell, the structure is simple, the arrangement is convenient, and the cost is low.

Next, a heating method of the power battery heating system proposed according to the embodiment of the present invention is described with reference to the drawings.

Fig. 5 is a flow chart of a heating method of the power battery heating system according to an embodiment of the invention.

As shown in fig. 5, the heating method of the power battery heating system includes:

and S1, collecting the temperature of each battery cell in the power battery box.

And S2, when the temperature of the battery cell monomer is lower than the preset temperature, heating each battery cell monomer through the heating film until each battery cell monomer in the power battery reaches the preset temperature.

Further, in an embodiment of the present invention, the method further includes:

and determining a heating mode of each battery cell through the temperature of each battery cell in the power battery box, wherein the heating mode comprises the electrifying time and the electrifying intensity of each battery cell.

It can be understood that, when all the battery cell monomers reach the preset temperature, the power battery heating is completed, but in the heating process, the temperature of each battery cell monomer may be different, so that in the heating process, for the battery cells with excessively high temperature or excessively high temperature rise rate, the supply current of the surface heating films of the battery cells is correspondingly reduced, and thus the heating power of the surface heating films of the battery cells is correspondingly reduced. If the local electric core temperature reaches the upper limit value of the temperature in the heating process, the heating of the electric cores can be stopped, or the temperature rise rate and the temperature of the electric cores can be judged in advance, and heating of some electric cores is stopped before the upper limit temperature is reached, so that all the electric cores are ensured to be in a safe temperature range.

After stopping heating power battery, if still can continue to use electric core in the short time, can continue to supply power in order to maintain the temperature of incasement to the heating film on the internal surface of case, be a heat preservation function, prevent after a period because external environment temperature is low excessively, electric core temperature drops rapidly and can not discharge, if do not use for a long time, then can heat in advance before next use can.

It should be noted that the foregoing explanation of the system embodiment also applies to the method of this embodiment, and is not repeated here.

According to the heating method of the power battery heating system provided by the embodiment of the invention, the temperature of the battery core in the power battery box is acquired; when the temperature of a battery core in the power battery box is lower than a preset temperature, all heating films in the power battery box are powered; after the temperature of the electric core in the power battery box after heating is higher than the preset temperature, the electric core in the power battery box stops being heated, and only the heating film on the shell of the power battery box is supplied with power. The power battery system can realize quick, uniform and intelligent heating and heat preservation at low temperature.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.