CN117915499A - Heating film structure, battery device, battery system and battery heating control method - Google Patents
Heating film structure, battery device, battery system and battery heating control method Download PDFInfo
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- CN117915499A CN117915499A CN202311678090.5A CN202311678090A CN117915499A CN 117915499 A CN117915499 A CN 117915499A CN 202311678090 A CN202311678090 A CN 202311678090A CN 117915499 A CN117915499 A CN 117915499A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The application provides a heating film structure, a battery device, a battery system and a battery heating control method, wherein the heating film and a module buffer pad are integrated, so that the risk of deformation and tearing can be avoided in the heating process of the heating film due to the elasticity of the module buffer pad, and the risk of deformation and tearing caused by the expansion of a battery core or a cooling plate can be effectively avoided due to the fact that the heating film can be adhered to the battery core in the follow-up process, and the risk of dry burning is effectively avoided due to the elasticity of the module buffer pad. In addition, the module blotter and the heating film are integrated into a whole, so that the heat of the heating film can be fully acted on the battery cell adhered to the heating film, the temperature of the battery cell rises faster at low temperature, and the low-temperature performance of the battery system can be effectively and rapidly improved. Meanwhile, whether the battery is heated or not can be accurately controlled through the battery heating control method, the risk of thermal runaway is prevented, and cost can be effectively reduced.
Description
Technical Field
The application relates to the technical field of battery heating, in particular to a heating film structure, a battery device, a battery system and a battery heating control method.
Background
The current power battery has the advantages that the available capacity of the battery is reduced more under the low-temperature condition, so that the loss of the driving mileage of the whole vehicle is larger than that of the normal temperature, meanwhile, under the low-temperature condition, the battery core can be in a analysis phenomenon in the charging process to induce internal short circuit, and the thermal runaway of the battery core can occur.
At present, a heating film is widely used to heat the battery. The heating position of the heating film relative to the battery core and the bonding mode of the heating film relative to other parts of the battery system are different. However, if the heating film is attached at an improper position, dry burning is likely to occur. Meanwhile, it is also difficult to precisely heat the battery to a predetermined temperature using heating film heating. Therefore, it is desirable to provide a heating film sticking scheme capable of precisely controlling battery heating, preventing thermal runaway risk, and improving charging efficiency.
Disclosure of Invention
The present application has been made in view of the above-described drawbacks of the related art, and an object of the present application is to provide a heating film structure, a battery device, a battery system, and a battery heating control method, which avoid the risk of dry heating of a heating film and prevent the risk of thermal runaway.
In order to achieve the above purpose, the technical scheme adopted by the embodiment of the application is as follows:
In a first aspect, an embodiment of the present application provides a heating film structure, including: the module cushion pad, the first heating film and the second heating film;
one surface of the first heating film is integrally adhered to one surface of the module buffer cushion, and the other surface of the first heating film is used for adhering the battery cell;
one surface of the second heating film is integrally adhered with the other surface of the module buffer cushion; the other surface of the second heating film is used for pasting a battery cell;
the first heating film and the second heating film are respectively used for heating the adhered battery cells.
Optionally, the first heating film and the second heating film respectively include: heating the resistance wire and the insulating layer;
one surface of the insulating layer is adhered to one surface of the module buffer pad;
The heating resistance wire is stuck on the other surface of the insulating layer;
The heating resistance wire includes: the device comprises a top section and a bottom section which are connected with each other, wherein the distance between the top section and the bottom section is larger than a preset distance.
Optionally, the other surface of the insulating layer includes a breaking structure along the extending direction of the heating resistance wires, and the breaking structure is disposed in a gap between the heating resistance wires.
Optionally, the method further comprises: a plurality of joints;
one end of each connector is connected with the tail end of the heating resistance wire in each heating film.
Optionally, the method further comprises: a first adhesive tape and a second adhesive tape;
One surface of the first adhesive tape is stuck to one side of the module buffer pad;
one surface of the second adhesive tape is stuck to the other side of the module buffer pad;
The second surface of the first adhesive tape is used for being stuck to the battery cell;
the third surface of the first adhesive tape and the third surface of the second adhesive tape are all used for being adhered to the battery cell.
In a second aspect, an embodiment of the present application further provides a battery device, including: the heating film structure of the first aspect is arranged between the plurality of electric cores and two adjacent electric cores.
In a third aspect, an embodiment of the present application further provides a battery system, including: the battery device according to at least one second aspect, a cooling plate, and a case, wherein the cooling plate is in close contact with each of the battery devices, and each of the battery devices and the cooling plate is located in the case.
In a fourth aspect, an embodiment of the present application further provides a battery heating control method, applied to a battery management system, for performing heating control on each electric core in the battery system according to the third aspect, where the method includes:
Acquiring second temperature of a cooling plate, third temperature of a box body, current information and voltage information of the battery cell during charging in the battery system;
determining an expected temperature difference value of the battery cell according to the second temperature, the third temperature, the attribute information of the battery cell, the attribute information of the cooling plate, the attribute information of air in the box body, the current information and the voltage information of the battery cell during charging and coefficients predetermined in a calibration stage;
determining the expected temperature of the battery cell at the current moment according to the initial temperature of the battery cell before heating and the expected temperature difference value;
and determining whether to stop heating according to the expected temperature and the preset target temperature, and if so, stopping heating each electric core in the battery system.
Optionally, the determining the expected temperature difference of the battery cell according to the second temperature, the third temperature, the attribute information of the cooling plate, the attribute information of the air in the box body, and the coefficient predetermined in the calibration stage includes:
Determining a third temperature difference value in the box body and a second temperature difference value of the cooling plate according to the second temperature, the temperature of the cooling plate at the moment before the current moment, the third temperature and the temperature of the box body at the moment before the current moment;
determining the heat of the cooling liquid in the cooling plate according to the second temperature difference value, the attribute information of the cooling plate and a predetermined coefficient;
Determining heat of air heat dissipation according to the third temperature difference value, the attribute information of the air in the box body, a predetermined coefficient and heating time;
Determining the heat input by the heating film according to the heating time, the current information when the battery cell is charged and the resistance value of the heating resistance wire;
Determining the increased heat in the charging process of the battery cell according to the current information, the voltage information, the heating time and the predetermined coefficient when the battery cell is charged;
and determining the expected temperature difference of the battery cell according to the heat of the cooling liquid in the cooling plate, the heat of air heat dissipation, the heat input by the heating film, the heat added in the battery cell charging process, the attribute information of the battery cell and a predetermined coefficient.
Optionally, the determining the third temperature difference in the box and the second temperature difference of the cooling plate according to the second temperature, the temperature of the cooling plate at the time before the current time, the third temperature, and the temperature of the box at the time before the current time includes:
determining a second temperature difference for the cooling plate based on the second temperature and an initial temperature of the cooling plate;
and determining a third temperature difference value in the box body according to the third temperature and the temperature of the box body at the moment before the current moment.
In a fifth aspect, an embodiment of the present application further provides an electronic device, including: the battery heating control method comprises a processor, a storage medium and a bus, wherein the storage medium stores program instructions executable by the processor, when an application program runs, the processor and the storage medium are communicated through the bus, and the processor executes the program instructions to execute the steps of the battery heating control method according to the fourth aspect.
In a sixth aspect, an embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, the computer program being read and executing the steps of the battery heating control method according to the fourth aspect.
The beneficial effects of the application are as follows:
According to the heating film structure, the battery device, the battery system and the battery heating control method, the heating film and the module buffer pad are integrated, so that the heating film can be tightly attached to the battery core due to the elasticity of the module buffer pad in the heating process, and the risk of deformation and tearing is effectively avoided compared with the existing method that the heating film can be attached to the battery core or the cooling plate due to the fact that the heating film is attached to the battery core, and the risk of deformation and tearing caused by expansion of the battery core or the cooling plate is effectively avoided. In addition, the module blotter and the heating film are integrated into a whole, so that the heat of the heating film can be fully acted on the battery cell adhered to the heating film, the temperature of the battery cell rises faster at low temperature, and the low-temperature performance of the battery system can be effectively and rapidly improved.
Meanwhile, whether heating is stopped or not is determined according to the expected temperature at each moment and the preset target temperature, a temperature detection device is not required to be arranged on the heating film structure, whether the battery is heated or not can be accurately controlled, the risk of thermal runaway is prevented, and cost can be effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a heating film structure according to an embodiment of the present application;
Fig. 2 is a schematic diagram of a battery device according to an embodiment of the present application;
fig. 3 is a schematic flow chart of a battery heating control method according to an embodiment of the present application;
fig. 4 is a flowchart of another battery heating control method according to an embodiment of the present application;
Fig. 5 is a block diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application, and it should be understood that the drawings in the present application are for the purpose of illustration and description only and are not intended to limit the scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this disclosure, illustrates operations implemented according to some embodiments of the present application. It should be understood that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to or removed from the flow diagrams by those skilled in the art under the direction of the present disclosure.
In addition, the described embodiments are only some, but not all, embodiments of the application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that the term "comprising" will be used in embodiments of the application to indicate the presence of the features stated hereafter, but not to exclude the addition of other features.
Fig. 1 is a schematic view of a heating film structure according to an embodiment of the present application, and as shown in fig. 1, the heating film structure may include a module cushion pad 1, a first heating film 2, and a second heating film 3.
One surface of the first heating film 2 is integrally adhered to one surface of the module buffer pad 1, and the other surface of the first heating film 2 is used for adhering an electric core, in particular to an electric core 9 as shown in fig. 2; one surface of the second heating film 3 is integrally adhered to the other surface of the module cushion 1, and the other surface of the second heating film 3 can be used for adhering the battery cell, specifically, the battery cell 10 as shown in fig. 2.
The first heating film 2 is shown in a schematic structure on the front side in fig. 1, the second heating film 3 is shown in a structure on the back side in fig. 1, and the first heating film 2 is the same as the second heating film 3.
Optionally, the module cushion pad 1 may be an elastic foam, and may be set to an arc surface or a plane, for example, if the module cushion pad 1 may include two arc surfaces when being an arc surface, the heating film may be integrally adhered to the two arc surfaces of the module cushion pad 1, as shown in fig. 1, the first heating film 2 is integrally adhered to one surface of the module cushion pad 1, and the second heating film 3 is integrally adhered to the other surface of the module cushion pad 1. Since the other side of the first heating film 2 is used for pasting the battery cells, and the second heating film 3 is used for pasting the battery cells, the module buffer pad 1 is in a gap between the two battery cells, specifically as shown in fig. 2, and the module buffer pad 1 is between the battery cell 10 and the battery cell 9.
Optionally, the heating film and the module buffer pad 1 are integrated, the module buffer pad 1 and the heating film are fused and then are positioned in a gap between the two electric cores, the length, the width and the thickness of the module buffer pad 1 and the heating film are adjusted along with the size of the side surfaces of the electric cores, the thickness of the module buffer pad 1 can be set based on the gap between the two electric cores, and if the thickness between the two electric cores is increased, the thickness of the module buffer pad 1 is also increased along with the increase; if the thickness between the two cells is reduced, the thickness of the module cushion 1 is also reduced.
By way of example, the thickness of the heating film may be, for example, 0.35mm, well below the arrangement gap between the cells, any type of battery system may be satisfied.
Alternatively, the heating film and the battery cell can be adhered through elastic foam of the module buffer pad 1, when the battery cell expands, the module buffer pad 1 is compressed, and the heating film moves along with the module buffer pad 1; when the battery cell is in the low-temperature normal state, the foam overall dimension of the module buffer pad 1 is larger than a certain compression amount of the elastic foam of the module buffer pad 1, so that the lamination between the heating film and the battery cell can be ensured, and the dry burning risk is avoided.
In this embodiment, through combining heating film and module blotter into a whole for the heating film can avoid deformation tearing's risk because the elasticity of module blotter in the heating process, and because the heating film can paste with the electric core subsequently, compare in current pasting heating film and electric core or cooling plate, can effectively avoid tearing the risk because the deformation that electric core or cooling plate inflation caused, elasticity through the module blotter makes can closely laminate between heating film and the electric core, effectively avoids appearing the risk of dry combustion method. In addition, the module blotter and the heating film are integrated into a whole, so that the heat of the heating film can be fully acted on the battery cell adhered to the heating film, the temperature of the battery cell rises faster at low temperature, and the low-temperature performance of the battery system can be effectively and rapidly improved.
With continued reference to fig. 1, as shown in fig. 1, the first heating film 2 and the second heating film 3 may include heating resistance wires 4 and an insulating layer 5, respectively.
Wherein, the one side of insulating layer 5 is pasted with the one side of module blotter 1, and heating resistor wire 4 pastes the another side at insulating layer 5, and heating resistor wire 4 can include interconnect's top section and bottom section, and distance between top section and the bottom section is greater than the default distance, and this default distance makes there is the space between the heating resistor wire.
In this embodiment, a gap is formed between the heating resistance wires, so that the module cushion pad can avoid the heating film from being torn when being deformed.
With continued reference to fig. 1, as shown in fig. 1, the other side of the insulating layer 5 includes a breaking structure in the extending direction of the heating resistance wires, and the breaking structure is disposed in the gaps between the heating resistance wires. The breaking structure is a diamond-shaped structure part in the transverse direction shown in fig. 1, and the breaking structure can effectively ensure that the module buffer pad 1 is torn in the deformation process, so that the insulating layer of the heating film is prevented from being torn due to deformation, and the strength of the module buffer pad is effectively ensured.
With continued reference to fig. 1, the first heating film 2 and the second heating film 3 each further include a plurality of joints, specifically, as the joint 6 in fig. 1, one end of each joint is connected to the end of the heating resistance wire in each heating film, the other end of each joint may be connected to other circuits or the joints of other heating films may be connected in series, and the joints of other heating films may be connected in series so that the heating films are connected in series with other heating films. Specifically, the connector may be provided in a wire structure, or may be provided in other structures, without limitation in this embodiment.
With continued reference to fig. 1, the heating film structure may further include: a first adhesive tape 7 and a second adhesive tape 8. Wherein one surface of the first adhesive tape 7 may be adhered to one side of the module buffer pad 1, specifically, the first adhesive tape 7 is adhered to both side surfaces of the upper side of the module buffer pad 1 as shown in fig. 1; one surface of the second tape 8 is attached to the other side of the module cushion, and specifically, the second tape 8 is attached to both side surfaces of the lower side of the module cushion 1 as shown in fig. 1. Then, the second surface of the first adhesive tape 7 and the second surface of the second adhesive tape 8 may be adhered to the battery cell, specifically, as shown in fig. 2, the second surface of the first adhesive tape 7 and the second surface of the second adhesive tape 8 may be adhered to the battery cell 9. The third surface of the first tape 7 and the third surface of the second tape 8 may be adhered to the battery cell, and specifically, as shown in fig. 2, the third surface of the first tape 7 and the third surface of the second tape 8 may be adhered to the battery cell 10.
In this embodiment, the electric core and the electric core are adhered together through the adhesive tape, so that the heating film can be fixed, the electric core and the electric core can be effectively connected, and after the electric cores and the heating film are mutually connected, the arrangement of the battery device can be completed.
Alternatively, in order to more clearly show the manufacturing process of the heating film structure of the present application, the description will be made by way of the present exemplary embodiment. Specifically, for example, a square shell cell can be selected, the dimension of the large side surface of the square shell cell can be measured, for example, the dimension of the large side surface can be set to be 300mm long and 100mm high, a single module buffer pad is set to be 280mm long and 80mm high based on the dimension of the long side surface of the cell, and 10mm adhesive tapes can be used for pasting on the upper side and the lower side of the module buffer pad, so that the dimension of a heating film is 260 mm long and 60mm high, two rows of heating resistance wires can be selected based on the length and the height of the heating film, a breaking part with the length of 230mm and the width of 5-10 mm is set in the center part of the heating film resistance wire, the module buffer pad is set to be 280mm long and 80mm high, the heating film and the module buffer pad are assembled together in a gluing mode or a thermoplastic molding mode, and a sample area with the periphery of 10mm is pasted, the heating film structure is manufactured, two heating film structures are pasted between each cell and the two heating film structures can be connected in series by connecting the heating films in series through a connector, and the two heating films can be connected with other heating structures in series.
Optionally, the embodiment further provides a battery device, where the battery device may include a plurality of electric cells, and the heating film structure in the foregoing specific embodiment is disposed between two adjacent electric cells.
Optionally, the present embodiment further provides a battery system, where the battery system may include the battery devices, the cooling plate, and the case in the foregoing specific embodiments, where the cooling plate is attached to each battery device, and each battery device and the cooling plate are located in the case.
Optionally, when the heating film in the heating film structure heats the electric cores, the temperature state of the heating film is heat input, that is, heat is input to each electric core; at low temperature, each cell in the battery system is thermally conductive to the cooling plate, the case, the air, and the like, and at this time, each cell is in a state of outputting heat. The heat input and the heat output of the battery cell reach balance, but the temperature of the heating film is higher than the final temperature of the battery cell, because of heat conduction loss among parts in the battery system and temperature delay between the heat input and the temperature rise of the battery cell. Therefore, the embodiment of the application provides a battery heating control method which can accurately control battery heating and prevent thermal runaway risks. Next, a battery heating control method is explained by a specific embodiment.
Fig. 3 is a schematic flow chart of a battery heating control method according to an embodiment of the present application, where the method is applied to a battery management system, and may be used to perform heating control on each electric core in the battery system in the foregoing specific embodiment, as shown in fig. 3, and the method may include:
S101, acquiring second temperature of a cooling plate in the battery system, third temperature of a box body, current information and voltage information during battery cell charging at intervals of a preset time period.
Alternatively, a Battery Management System (BMS) may read the temperature of the Battery cells in the Battery system every preset time period, for example, may use t1 to indicate; the second temperature of the cooling plate may be represented, for example, using t 2; the third temperature of the tank may be represented, for example, using t3, the current information at the time of the cell charging, specifically, the current information may include, for example, an instantaneous current at the time of the cell charging, may be represented, for example, using Is, and the heating film resistor R, the heating film current I; the voltage information may include, for example, a cell charging voltage U.
For example, if the battery is heated for 5min, the first temperature of the battery cell, the second temperature of the cooling plate, the third temperature of the box, the current information and the voltage information of the battery cell at the current time after the battery in the battery system is heated for 5min may be read.
Optionally, before acquiring the second temperature of the cooling plate, the third temperature of the box, the current information during charging of the battery cell, and the voltage information in the battery system, the energy Q1 required for the temperature rise of the battery cell may be initially estimated according to the initial temperature and the target temperature of the battery cell before heating, specifically q1=k1×c1×m1×Δt1, and then energy may be input to the battery cell according to the estimated energy to heat the battery cell, where the second temperature of the cooling plate, the third temperature of the box, the current information during charging of the battery cell, and the voltage information are acquired at intervals during heating.
S102, determining an expected temperature difference value of the battery cell according to the second temperature, the third temperature, the attribute information of the battery cell, the attribute information of the cooling plate, the attribute information of air in the box body, the current information and the voltage information of the battery cell during charging and coefficients predetermined in a calibration stage.
The attribute information of the battery cell may include, for example, a specific heat capacity c1 of the battery cell and a mass m1 of the battery cell; the property information of the cooling plate may include, for example, a specific heat capacity c2 of the cooling liquid in the cooling plate and a cooling plate mass m2; the attribute information of the air in the tank may include, for example, the specific heat capacity c3 of the air in the tank and the mass m3 of the air in the tank.
The predetermined coefficients in the calibration stage may include, for example, a cell heat coefficient k1 corresponding to a static temperature increase of the cell, a cooling plate heat coefficient k2, an air heat coefficient k3 during air heat dissipation, a heat dissipation rate epsilon, and a cell heat coefficient k5 during a cell charging process.
For example, the expected temperature difference of the battery cell after the battery is heated for 5min may be determined according to the read first temperature, the second temperature, the third temperature, the current information of the battery cell during charging, the voltage information, the attribute information of the battery cell, the attribute information of the cooling plate, the attribute information of the air in the box and the coefficient predetermined in the calibration stage at the current time after the battery is heated for 5 min.
S103, determining the expected temperature of the battery cell at the current moment according to the initial temperature of the battery cell before heating and the expected temperature difference value.
Specifically, the initial temperature before the battery is heated and the expected temperature difference value are added to obtain the expected temperature of the battery cell at the current moment.
For example, if the current time refers to the time after the battery is heated for 5 minutes, the expected temperature at the current time may be obtained according to the expected temperature difference calculated in S102 and the initial temperature before heating. Specifically, if the initial temperature of the battery before heating is-20 ℃, and the expected temperature difference obtained by the calculation of S102 is 10 ℃ after heating for 5min, the expected temperature of the battery cell at the current time is-10 ℃.
S104, determining whether the expected temperature is greater than or equal to a preset target temperature according to the expected temperature and the preset target temperature.
If yes, the heating is stopped, and if not, the process returns to S101.
Specifically, if the expected temperature at the current time is less than the preset target temperature, heating may be continued and execution may be continued as returned S101; and stopping heating if the expected temperature at the current moment is greater than or equal to the preset target temperature.
In this embodiment, based on the heating film structure of the present application, the heating rate can be effectively increased, and whether to stop heating is determined according to the expected temperature at each time and the preset target temperature, so that it is unnecessary to arrange a temperature detection device on the heating film structure, and whether to heat the battery can be accurately controlled, thereby preventing the risk of thermal runaway, and effectively reducing the cost.
Fig. 4 is a schematic flow chart of another battery heating control method according to an embodiment of the present application, as shown in fig. 4, the determining, in S102, an expected temperature difference of the battery cell according to the first temperature, the second temperature, the third temperature, the attribute information of the battery cell, the attribute information of the cooling plate, the attribute information of the air in the case, the current information and the voltage information of the battery cell during charging, and coefficients predetermined in the calibration stage may include:
S201, determining a second temperature difference value of the cooling plate and a third temperature difference value in the box body according to the second temperature, the temperature of the cooling plate at the moment before the current moment, the third temperature and the temperature of the box body at the moment before the current moment.
The time before the current time refers to a time before a preset interval period of the current time, and if the data is acquired every 5min, the current time is 10min, and the time before the current time refers to 5min.
Wherein the second temperature difference refers to a temperature change Deltat 2 of the cooling plate at the current moment compared with a temperature change at a moment before the current moment; the third temperature difference refers to a temperature change Δt3 of the air in the case at the current time compared to a time previous to the current time.
S202, determining the heat quantity of the cooling liquid in the cooling plate according to the second temperature difference value, the attribute information of the cooling plate and a predetermined coefficient.
Wherein the predetermined coefficient refers to the cooling plate heat coefficient k2.
Specifically, the heat quantity q2=k2×c2×m2×Δt2 of the cooling liquid in the cooling plate.
S203, determining the heat dissipating capacity of the air according to the third temperature difference, the attribute information of the air in the box body, the predetermined coefficient and the heating time.
The predetermined coefficient refers to an air heat quantity coefficient k3 and a heat radiation rate epsilon when air radiates heat, and the heating time is DeltaT. Because the battery continuously radiates heat outwards, and the battery is placed in the box body, and the air in the box body is airtight, the temperature change of the box body is not great in the period of time, and the heat exchange rate can be considered to be constant and is only related to time.
Specifically, the heat of air heat dissipation is loss heat Δq=k3×c3×m3×Δt3+ε×Δt.
S204, determining the heat input by the heating film according to the heating time, the current information during charging of the battery cell and the resistance value of the heating resistance wire.
Specifically, the heat quantity q3=i 2 ×r×Δt input to the heating film.
S205, determining the increased heat in the battery cell charging process according to the current information, the voltage information, the heating time and the predetermined coefficient during the battery cell charging.
The predetermined coefficient refers to a cell heat coefficient k5 in the process of charging the cell.
Specifically, the heat q4=k5×ζ I s ×u×Δt increased during the charging process of the battery cell.
S206, determining the expected temperature difference of the battery cell according to the heat of the cooling liquid in the cooling plate, the heat of air heat dissipation, the heat input by the heating film, the heat added in the battery cell charging process, the attribute information of the battery cell and the predetermined coefficient.
The predetermined coefficient refers to a cell heat coefficient k1 corresponding to the static temperature rise of the cell, the attribute information of the cell refers to a cell specific heat capacity c1 and a cell mass m1, and an expected temperature difference value of the cell is determined.
Specifically, it can be calculated by the following formula (one).
I2*R*△T+k5*∫Is*U*△T＝k1*c1*m1*△t1+k2*c2*m2*△t2+
K3.c3.m3.DELTA.t3+ε.DELTA.T formula (one)
Alternatively, the above formula (one) is a specific form of q3+q4=q1+q2+Δq, where Q1 refers to the heat corresponding to the static temperature increase of the cell.
Optionally, in S201, determining the first temperature difference value of the battery cell, the second temperature difference value of the cooling plate, and the third temperature difference value in the case according to the first temperature, the temperature of the battery cell at the time before the current time, the second temperature, the temperature of the cooling plate at the time before the current time, the third temperature, and the temperature of the case at the time before the current time may include:
Optionally, the second temperature difference of the cooling plate is determined according to the second temperature and the temperature of the cooling plate at the time before the current time, specifically, the difference obtained by subtracting the temperature at the time before the current time from the second temperature is calculated as the second temperature difference of the cooling plate.
Optionally, the third temperature difference in the box is determined according to the third temperature and the temperature in the box at the time before the current time. Specifically, a difference of the third temperature minus the temperature at the time immediately before the current time is calculated as the third temperature difference in the case.
Optionally, the determination of the coefficients predetermined during the calibration phase is as follows:
Alternatively, when the heating film heats up, the flow of liquid inside the cooling plate is stopped, placing the battery in a static state. The calibration phase may refer to experimentally predetermined coefficients.
Specifically, when the battery device and the cooling plate are placed in the temperature experiment cabin, the specific heat capacity of the battery cell can be set to be c1, the specific heat capacity of the cooling liquid in the cooling plate can be set to be c2, the specific heat capacity of the air can be set to be c3, the battery cell mass m1, the cooling plate mass m2 and the air mass m3 can be obtained through the set parameters, the initial temperature of the temperature experiment cabin can be set to be-20 ℃, the initial temperature T1 of the battery cell, the initial temperature T2 of the cooling plate and the initial temperature T3 in the experiment cabin can be read, the heating die can be heated, after heating for a period of time DeltaT, the heating film resistor R, the heating film current I, the battery charging current Is and the battery charging voltage U can be read, and then a group of data during the heating for a period of time DeltaT can be obtained; and reading the temperature of the battery cell, the temperature of the cooling plate and the temperature in the experiment cabin at intervals, and stopping heating until the temperature of the battery cell meets the target temperature requirement, wherein the heating film resistor R, the heating film current I, the battery charging current Is and the battery charging voltage U. The temperature difference between the temperature of the battery cell at each time and the temperature difference between the temperature of the cooling plate and the temperature difference in the experimental cabin at the previous time can be obtained, the data at each time can be substituted into the formula (one) to obtain the corresponding formula (one) at a plurality of different times, and each coefficient in the formula (one) can be obtained by solving and linearly fitting the temperature detection points from the initial temperature to the target temperature, in particular, the coefficients k1, k2, k3, k5 and epsilon can be obtained.
Fig. 5 is a block diagram of an electronic device 400 according to an embodiment of the present application, which may include the battery management system described above, for example. As shown in fig. 5, the electronic device may include: a processor 401, and a memory 402.
Optionally, a bus 403 may be further included, where the memory 402 is configured to store machine readable instructions executable by the processor 401, where the processor 401 and the memory 402 store communicate over the bus 403 when the electronic device 400 is running, where the machine readable instructions are executed by the processor 401 to perform the method steps in the method embodiments described above.
The embodiment of the application also provides a computer readable storage medium, and a computer program is stored on the computer readable storage medium, and the computer program is executed by a processor to execute the method steps in the embodiment of the battery heating control method.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described system and apparatus may refer to corresponding procedures in the method embodiments, and are not repeated in the present disclosure. In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, and the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, and for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, indirect coupling or communication connection of devices or modules, electrical, mechanical, or other form.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily appreciate variations or alternatives within the scope of the present application.
Claims (10)
1. A heating film structure, comprising: the module cushion pad, the first heating film and the second heating film;
one surface of the first heating film is integrally adhered to one surface of the module buffer cushion, and the other surface of the first heating film is used for adhering the battery cell;
one surface of the second heating film is integrally adhered with the other surface of the module buffer cushion; the other surface of the second heating film is used for pasting a battery cell;
the first heating film and the second heating film are respectively used for heating the adhered battery cells.
2. The heating film structure according to claim 1, wherein the first heating film and the second heating film each include: heating the resistance wire and the insulating layer;
one surface of the insulating layer is adhered to one surface of the module buffer pad;
The heating resistance wire is stuck on the other surface of the insulating layer;
The heating resistance wire includes: the device comprises a top section and a bottom section which are connected with each other, wherein the distance between the top section and the bottom section is larger than a preset distance.
3. The heating film structure according to claim 2, wherein a breaking structure is included on the other face of the insulating layer in the extending direction of the heating resistance wires, and the breaking structure is provided in a space between the heating resistance wires.
4. The heating film structure of claim 2, further comprising: a plurality of joints;
One end of each connector is connected with the tail end of the heating resistance wire in each heating film.
5. The heating film structure of claim 1, further comprising: a first adhesive tape and a second adhesive tape;
One surface of the first adhesive tape is stuck to one side of the module buffer pad;
one surface of the second adhesive tape is stuck to the other side of the module buffer pad;
The second surface of the first adhesive tape is used for being stuck to the battery cell;
the third surface of the first adhesive tape and the third surface of the second adhesive tape are all used for being adhered to the battery cell.
6. A battery device, characterized by comprising: a plurality of electric cores, wherein the heating film structure of any one of claims 1-5 is arranged between two adjacent electric cores.
7. A battery system characterized by comprising: at least one battery device, a cooling plate, and a case according to claim 6, wherein the cooling plate is closely attached to each of the battery devices, and each of the battery devices and the cooling plate are located in the case.
8. A battery heating control method applied to a battery management system for performing heating control on each cell in the battery system according to claim 7, the method comprising:
Acquiring second temperature of a cooling plate, third temperature of a box body, current information and voltage information of the battery cell during charging in the battery system;
determining an expected temperature difference value of the battery cell according to the second temperature, the third temperature, the attribute information of the battery cell, the attribute information of the cooling plate, the attribute information of air in the box body, the current information and the voltage information of the battery cell during charging and coefficients predetermined in a calibration stage;
determining the expected temperature of the battery cell at the current moment according to the initial temperature of the battery cell before heating and the expected temperature difference value;
and determining whether to stop heating according to the expected temperature and the preset target temperature, and if so, stopping heating each electric core in the battery system.
9. The battery heating control method according to claim 8, wherein the determining the expected temperature difference of the battery cell based on the second temperature, the third temperature, the property information of the cooling plate, the property information of the air in the case, and the coefficient predetermined in the calibration stage includes:
Determining a third temperature difference value in the box body and a second temperature difference value of the cooling plate according to the second temperature, the temperature of the cooling plate at the moment before the current moment, the third temperature and the temperature of the box body at the moment before the current moment;
determining the heat of the cooling liquid in the cooling plate according to the second temperature difference value, the attribute information of the cooling plate and a predetermined coefficient;
Determining heat of air heat dissipation according to the third temperature difference value, the attribute information of the air in the box body, a predetermined coefficient and heating time;
Determining the heat input by the heating film according to the heating time, the current information when the battery cell is charged and the resistance value of the heating resistance wire;
Determining the increased heat in the charging process of the battery cell according to the current information, the voltage information, the heating time and the predetermined coefficient when the battery cell is charged;
and determining the expected temperature difference of the battery cell according to the heat of the cooling liquid in the cooling plate, the heat of air heat dissipation, the heat input by the heating film, the heat added in the battery cell charging process, the attribute information of the battery cell and a predetermined coefficient.
10. The battery heating control method according to claim 9, wherein the determining the third temperature difference in the case and the second temperature difference in the cooling plate based on the second temperature, the temperature of the cooling plate at the time immediately before the current time, the third temperature, and the temperature of the case at the time immediately before the current time includes:
determining a second temperature difference for the cooling plate based on the second temperature and an initial temperature of the cooling plate;
and determining a third temperature difference value in the box body according to the third temperature and the temperature of the box body at the moment before the current moment.
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| CN118089855A (en) * | 2024-04-22 | 2024-05-28 | 致沿科技(南京)有限公司 | Dry combustion method and device for membrane resistance heater |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118089855A (en) * | 2024-04-22 | 2024-05-28 | 致沿科技(南京)有限公司 | Dry combustion method and device for membrane resistance heater |
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