阅读说明：本技术 锂电池及其加热方法 (Lithium battery and heating method thereof ) 是由 徐晓明 洪吉超 赤骋 赵磊 张伟 丁华 于 2021-06-08 设计创作，主要内容包括：本发明公开了一种锂电池及其加热方法,包括：电芯及加热膜制作的锂电池外壳,加热膜贴附在电芯表面；加热膜包括基底层,发热层和防水层,在基底层上镀一层金属氧化物半导体制热材料MOSH的薄膜形成发热层,在发热层上贴附一层防水层,在发热层引出一正一负两个电极,通电后产生热量。在低温环境中,对加热膜通电后产生热量,对锂电池进行加热,可以使锂电池快速升温,并且升温均匀可控,结构简单,便于布置,成本低。(The invention discloses a lithium battery and a heating method thereof, wherein the heating method comprises the following steps: the lithium battery comprises a battery core and a lithium battery shell made of a heating film, wherein the heating film is attached to the surface of the battery core; the heating film comprises a base layer, a heating layer and a waterproof layer, wherein a layer of metal oxide semiconductor heating material MOSH film 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, and heat is generated after the heating layer is electrified. In low temperature environment, produce the heat to heating film circular telegram back, heat the lithium cell, can make the lithium cell rapid heating up to it is even controllable to heat up, simple structure, is convenient for arrange with low costs.)

1. A lithium battery, comprising:

the lithium battery comprises a battery core and a lithium battery shell made of a heating film, wherein the heating film is attached to the surface of the battery core;

the heating film comprises a base layer, a heating layer and a waterproof layer, wherein the base layer is plated 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, and heat is generated after the heating layer is electrified.

2. The lithium battery of claim 1,

the heating film is connected with an external power supply, and the external power supply comprises a storage battery.

3. The lithium battery as claimed in claim 1, wherein the heating rate and the maximum heating temperature of the lithium battery are controlled by adjusting the energization time and the energization intensity of the heating film.

4. The lithium battery of claim 1, further comprising: a temperature sensor;

the temperature sensor is arranged on the surface of the lithium battery and used for detecting the temperature of the lithium battery.

5. A heating method for the lithium battery of claims 1-4, comprising the steps of:

collecting the temperature of the lithium battery;

when the temperature is lower than the preset temperature, the heating film of the lithium battery is electrified to generate heat for heating the lithium battery.

6. The method according to claim 5, wherein the energization time and the energization intensity are set according to a difference between the temperature and a preset temperature.

Technical Field

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

Background

The lithium battery is used as a power source of the new energy vehicle, and the working performance of the lithium battery directly influences the power performance of the whole vehicle. The lithium 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 method is based on the thermal management technology for the vehicle, and heat conduction from outside to inside is realized by adding high-temperature liquid/gas, an electric heating plate and a phase-change material outside a battery pack or a battery module and by means of Peltier effect and the like. The load of the air conditioning system is large by directly heating the battery box by using hot air, and the economy is poor; the liquid heating method has higher requirements on the sealing and insulation of the battery box, can increase the complexity of the whole battery design, and has a plurality of problems to be solved in the aspect of reliability; the heating time is long, the temperature distribution of the battery pack after heating is not uniform, and a large temperature difference occurs.

Internal heating: the internal heating method is to heat the battery by joule heat generated by passing current through a conductor having a certain resistance value, which is the battery itself. 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 battery monomer needs to be greatly changed, so that the energy density of the battery is reduced to a certain extent, and the energy consumption is higher.

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, an object of the present invention is to provide a lithium battery, which can rapidly increase the temperature in a low temperature environment, and the temperature increase is uniform and controllable.

Another object of the present invention is to provide a heating method for a lithium battery.

In order to achieve the above object, an embodiment of an aspect of the present invention provides a lithium battery, including: the lithium battery comprises a battery core and a lithium battery shell made of a heating film, wherein the heating film is attached to the surface of the battery core;

the heating film comprises a base layer, a heating layer and a waterproof layer, wherein the base layer is plated 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, and heat is generated after the heating layer is electrified.

According to the lithium battery provided by the embodiment of the invention, the lithium battery shell is manufactured by the heating film, the heating film generates heat after being electrified in a low-temperature environment, and the lithium battery is heated, so that the temperature of the lithium battery can be rapidly raised, and the lithium battery is uniform and controllable in temperature rise, simple in structure, convenient to arrange and low in cost.

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

further, the heating film is connected with an external power supply, and the external power supply comprises a storage battery.

Further, the electrifying time and the electrifying intensity of the heating film are adjusted, and the heating rate and the heating highest temperature of the lithium battery are controlled.

Further, still include: a temperature sensor is arranged on the surface of the lithium battery;

and measuring the temperature of the lithium battery through the temperature sensor.

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

collecting the temperature of the lithium battery;

when the temperature is lower than the preset temperature, the heating film of the lithium battery is electrified to generate heat for heating the lithium battery.

According to the heating method of the lithium battery, disclosed by the embodiment of the invention, the temperature of the lithium battery is collected; when the temperature is lower than the preset temperature, the heating film of the lithium battery is electrified to generate heat for heating the lithium battery. The temperature of the lithium battery can be rapidly raised in a low-temperature environment, and the temperature rise is uniform and controllable.

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

further, according to the difference value between the temperature and the preset temperature, the power-on time and the power-on intensity are set.

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 structural view of a lithium battery according to an embodiment of the present invention;

FIG. 2 is a schematic view of a heating film structure according to one embodiment of the present invention;

fig. 3 is a schematic structural diagram of a lithium battery heating system according to an embodiment of the present invention;

fig. 4 is a flowchart of a method of heating a lithium battery according to an embodiment of the present 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.

A lithium battery and a heating method thereof according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

A lithium battery proposed according to an embodiment of the present invention will be described first with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of a lithium battery according to an embodiment of the present invention.

As shown in fig. 1, the lithium battery includes: the lithium battery comprises a battery core and a lithium battery shell made of a heating film, wherein the heating film is attached to the surface of the battery core.

In fig. 1, lithium batteries (application objects include, but are not limited to, cylindrical lithium batteries and square-shell lithium batteries) with two different shapes are shown, and although the shapes are different, the shells are made by attaching a heating film on the surface of a battery cell lithium battery.

Further, the heating film comprises a base layer, a heating layer and a waterproof layer, a layer of metal oxide semiconductor heating material MOSH film 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, and heat is generated after the heating layer is electrified.

The embodiment of the invention adopts a key functional material, namely a metal oxide semiconductor heating Material (MOSH). A film coated with MOSH material is applied to a case of a surface of a cylindrical lithium battery or a square-case-shaped lithium battery, and two power lines, which are positive and negative, are extended from the film case. When the film shell is electrified, a large amount of heat can be generated due to the characteristics of the metal oxide semiconductor heating material, and the film shell is used for quickly and uniformly heating the battery. Meanwhile, the film also has the advantages of no pollution, light weight, low cost and the like, and the arrangement mode is simple and convenient without destroying the internal composition structure of the battery or initiating additional electrochemical reaction. The rate of temperature rise and the maximum temperature of heating during heating may be determined by the energization current and the energization time.

It can be understood that the heating film of the MOSH material of the present invention has different heating film performances, costs and structures compared to other kinds of heating films, and has the advantages of fast heating speed, more uniformity, high thermoelectric conversion efficiency, less power consumption, simple structure and low cost.

Fig. 2 is a schematic view of a heating film structure. 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.

Further, the electric energy required by the heating film is provided by an external power supply, which may be a storage battery or the like, and is not particularly limited.

It can be understood that the heating rate and the maximum heating temperature of the lithium battery are controlled by adjusting the energization time and the energization intensity of the heating film. For example, if the temperature of the lithium battery needs to be raised for a short time, the energization strength can be increased. If a higher temperature is required, the energization time can be increased, and the maximum heating temperature of the heating film is related to the area of the heating film.

As shown in fig. 3, in the heating system for lithium battery, the control can be performed by a controller, and the temperature required by the controller and the current temperature are obtained as heating rates, and the heating film is electrified according to the heating rates. After the temperature is changed, the heating rate of the heating film can be changed, and after the temperature reaches the preset temperature, the heating can be stopped, and the heating can be selected according to actual needs.

Specifically, cylindrical or square shell shape lithium cell surface casing is scribbled MOSH material, and the line that draws out from the shell links to each other with the battery (the electric quantity that the heating consumed does not come from lithium cell self), and when ambient temperature was lower when influencing the battery normal use, heating controller control film shell circular telegram produced heat and heated the battery rapidly, simultaneously, can change the size of circular telegram electric current according to the demand to heating time, changes heating power promptly to realize quick controllable heating. In addition, the uniformity of heat generation of the metal oxide semiconductor heating material is good, and the temperature uniformity of all parts of the surface in the battery heating process is good.

According to the lithium battery provided by the embodiment of the invention, in a low-temperature environment, the lithium battery shell made of the heating film is electrified to be heated, so that the accurate heating control of the lithium battery can be realized, heat can be rapidly transferred to the whole lithium battery during heating, the heating is more uniform, the temperature rise is controllable, the structure is simple, the arrangement is convenient, and the cost is low.

Next, a method for heating a lithium battery according to an embodiment of the present invention will be described with reference to the drawings.

Fig. 4 is a flowchart of a method of heating a lithium battery according to an embodiment of the present invention.

As shown in fig. 4, the heating method of the lithium battery includes:

and S1, collecting the temperature of the lithium battery.

And S2, when the temperature is lower than the preset temperature, electrifying the heating film of the lithium battery to generate heat to heat the lithium battery.

Further, the power-on time and the power-on intensity are set according to the difference value between the temperature and the preset temperature.

It should be noted that the foregoing explanation of the embodiment of the lithium battery is also applicable to the heating method of the lithium battery of this embodiment, and details are not repeated here.

According to the heating method of the lithium battery provided by the embodiment of the invention, the temperature of the lithium battery is collected; when the temperature is lower than the preset temperature, the heating film of the lithium battery is electrified to generate heat to heat the lithium battery. The temperature of the lithium battery can be rapidly raised in a low-temperature environment, and the temperature rise is uniform and controllable.

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.