Temperature integrated sampling device and cell heating method

Abstract

The application provides a temperature integrated sampling device and a cell heating method, wherein the temperature integrated sampling device is used for being integrated in the inside of a cell, and the temperature integrated sampling device comprises a heating device, a temperature detection sensor, a heating interface device, a temperature sampling interface and a temperature sampling line; the temperature detection sensor is used for detecting the temperature in the inside of the cell and is electrically connected with the temperature sampling interface through the temperature sampling line, so as to output a temperature detection signal through the temperature sampling interface; the heating device is used for heating the cell and is electrically connected with the heating interface device, so as to receive a heating signal through the heating interface device, and make the temperature in the inside of the cell reach a target temperature. The application can improve the accuracy of cell temperature detection, and can integrate the heating function under the premise of temperature detection.

Description

Technical Field

[0001] This application relates to the field of battery cell thermal control, and more specifically, to an integrated temperature sampling device and a battery cell heating method. Background Technology

[0002] Currently, cell temperature sampling is mostly performed on the busbar connected to the positive and negative terminals of the cell. This makes it difficult to accurately detect the actual temperature level of the cell, especially the internal areas. Consequently, it is difficult to accurately determine the actual temperature of the cell during actual use, making it difficult to accurately select the appropriate operating current threshold based on the current temperature, thus affecting the safe and reliable operation of the cell. Existing solutions also exist that can perform internal temperature sampling, but most of these methods are complex and have poor integration. Furthermore, due to issues such as the thickness of the sampling area, it is not possible to maintain a flat contact surface with the cell while inserting it, potentially causing wrinkles at the cell interface. This can affect the electrical performance during use, and severe wrinkles can even lead to internal short circuits, jeopardizing the cell's safety and reliability. In addition, existing technologies only provide a certain degree of temperature testing and characterization, lacking a built-in heating module to improve low-temperature power and fast-charging performance, and also lacking the ability to trigger thermal runaway for safety assessment. Summary of the Invention

[0003] The purpose of this application is to provide an integrated temperature sampling device and a cell heating method to improve the accuracy of cell temperature detection and to integrate heating functionality while still allowing for temperature detection.

[0004] In a first aspect, the present invention provides a temperature integrated sampling device, which is used to be integrated inside a battery cell. The temperature integrated sampling device includes: a heating device, a temperature detection sensor, a heating interface device, a temperature sampling interface, and a temperature sampling line.

[0005] The temperature detection sensor is used to detect the internal temperature of the battery cell and is electrically connected to the temperature sampling interface through the temperature sampling line so as to output a temperature detection signal through the temperature sampling interface;

[0006] The heating device is used to heat the battery cell and is electrically connected to the heating interface device to receive a heating signal through the heating interface device, so that the internal temperature of the battery cell reaches the target temperature.

[0007] The temperature integrated sampling device of this application embodiment can be integrated inside the battery cell. Through a temperature detection sensor, a temperature sampling interface, and a temperature sampling line, it can detect the internal temperature of the battery cell. The internal temperature detection result is then used as the battery cell temperature detection result. Compared with existing technologies, this provides a more realistic and accurate battery cell temperature. Existing technologies, which determine battery cell temperature based on temperature detection results at the battery cell busbar, cannot reflect the actual internal temperature of the battery cell because they are not based on internal temperature detection, resulting in low accuracy. Furthermore, this application integrates heating functionality by directly heating the inside of the battery cell through a heating interface device and a heating device.

[0008] In an optional embodiment, the temperature integrated sampling device further includes at least two temperature sensor deployment points, the number of temperature detection sensors being the same as the number of temperature sensor deployment points, wherein multiple temperature detection sensors share one temperature sampling interface.

[0009] This optional implementation allows temperature sensors to be installed at at least two temperature sensor deployment points, thereby acquiring temperatures at multiple locations and facilitating the calculation of the final internal temperature of the battery cell based on these multiple temperatures. Furthermore, having multiple temperature sensors share a single temperature sampling interface reduces wiring and simplifies the deployment process.

[0010] In an optional embodiment, the heating device includes a first heating wire and a second heating wire, and the heating interface device includes an upper heating interface and a lower heating interface;

[0011] The first heating wire is used to heat the upper internal region of the battery cell, and the second heating wire is used to heat the lower internal region of the battery cell. The first heating wire is electrically connected to the upper heating interface, and the second heating wire is electrically connected to the lower heating interface.

[0012] This optional embodiment can supply power to the first heating wire and the second heating wire through the upper heating interface and the lower heating interface, respectively, so that the first heating wire heats the upper internal region of the battery cell and the lower internal region of the battery cell, thereby achieving heating of a part of the internal region of the battery cell.

[0013] In an optional embodiment, the diameter of the temperature sampling line is in the range of 0.03-0.15 mm, and the diameters of the first heating wire and the second heating wire are both in the range of 0.03-0.15 mm, with the diameters of the first heating wire and the second heating wire being consistent with the diameter of the temperature sampling line.

[0014] In this optional embodiment, the diameter range of the temperature sampling wire is set to 0.03-0.15mm, and the diameter range of both the first heating wire and the second heating wire is set to 0.03-0.15mm. This facilitates reducing the overall thickness of the integrated temperature sampling device, allowing it to fit within the limited space inside the battery cell. Furthermore, the combination of a temperature sampling wire with a diameter range of 0.03-0.15mm with another wire with a diameter range of 0.03-0.15mm ensures that the large surfaces on both sides of the integrated temperature sampling device are as flat as possible, guaranteeing a certain degree of flatness.

[0015] In an optional embodiment, both the first heating wire and the second heating wire are metal resistance wires, wherein the calculation formula for the arrangement length of the metal resistance wire is:

[0016] L=R*πd 2 / (4*ρ);

[0017] Wherein, L represents the arrangement length of the metal resistance wire, R represents the internal resistance of the metal resistance wire, d represents the diameter of the metal resistance wire (the diameter of the metal resistance wire is a value within the range of wire diameter), ρ represents the resistivity of the metal resistance wire, and π represents pi.

[0018] This optional implementation method can calculate the arrangement length of the metal resistance wire based on the above calculation formula, according to the diameter, internal resistance, and wire diameter range of the metal resistance wire.

[0019] In an optional embodiment, the temperature integrated sampling device further includes a first insulating part and a second insulating part;

[0020] The first insulating part is disposed on the left side of the temperature sampling line and is used to wrap the left side of the temperature sampling line.

[0021] The second insulating part is disposed on the right side of the temperature sampling line and is used to wrap the right side of the temperature sampling line.

[0022] This optional embodiment can prevent the left side of the temperature sampling line from contacting the electrolyte inside the cell by means of the first insulating part, and on the other hand, it can prevent the right side of the temperature sampling line from contacting the electrolyte inside the cell by means of the first insulating part.

[0023] In an optional embodiment, the thickness of the first insulating portion and the second insulating portion is 0.06~0.15mm.

[0024] In this optional embodiment, the thickness of the first insulating part and the second insulating part is set to 0.06~0.15mm, which can make the thickness of the first insulating part and the second insulating part as thin as possible while ensuring the insulating effect of the first insulating part and the second insulating part, so as to adapt to the narrow space inside the electrical component.

[0025] In an optional embodiment, the temperature integrated sampling device further includes a third insulating part, wherein the third insulating part is disposed between the first insulating part and the second insulating part, for isolating the temperature sampling line from the electrolyte inside the cell and filling the gap between the first insulating part and the second insulating part.

[0026] In this optional embodiment, the third insulating part can cooperate with the first and second insulating parts to completely isolate the temperature sampling line from the electrolyte, thereby improving insulation performance. On the other hand, the third insulating part can also fill the gap between the first and second insulating parts, ensuring the flatness of the large surfaces on both sides of the temperature integrated sampling device. During long-term use inside the cell, uneven surfaces will not cause uneven stress on the internal electrodes, resulting in unexpected risks such as wrinkles and lithium plating, thus ensuring the safe and reliable use of the cell.

[0027] In a second aspect, the present invention provides a method for heating a battery cell, the method being applied to a temperature integrated sampling device as described in any of the foregoing embodiments, the method comprising:

[0028] The temperature detection signal generated by the integrated temperature sampling device to detect the inside of the battery cell is acquired, and the current temperature of the battery cell is determined based on the temperature detection signal;

[0029] Heating control parameters are determined based on the control mode;

[0030] The values ​​of the heating control parameters are calculated based on the parameters of the heating device and the parameters of the battery cell, the target temperature and the current temperature of the battery cell;

[0031] Based on the numerical values ​​of the heating control parameters, the temperature integrated sampling device is used to heat the battery cell to the target temperature.

[0032] This application can acquire a temperature detection signal generated by a temperature integrated sampling device detecting the inside of a battery cell, and determine the current temperature of the battery cell based on the temperature detection signal. It can then determine heating control parameters based on a control mode, calculate the value of the heating control parameters based on the parameters of the heating device and the parameters of the battery cell, the target temperature and the current temperature of the battery cell, and control the temperature integrated sampling device to heat the battery cell based on the value of the heating control parameters, so as to heat the battery cell to the target temperature through the temperature integrated sampling device.

[0033] In an optional embodiment, the parameters of the battery cell include the weight of the battery cell, the specific heat capacity of the battery cell, and the heating rate of the battery cell; the parameters of the heating device include the resistance of the heating device.

[0034] And, the determination of heating control parameters based on the control mode includes:

[0035] When the control mode is a fixed heating current mode, the heating control parameter is the heating duration;

[0036] When the control mode is a fixed heating time mode, the heating control parameter is the heating current value.

[0037] This optional embodiment can use the heating duration as the heating control parameter when the control mode is a fixed heating current value mode, and use the heating current value as the heating control parameter when the control mode is a fixed heating duration mode. On the other hand, this optional embodiment can calculate the heating control parameters based on the weight of the battery cell, the specific heat capacity of the battery cell, the heating rate of the battery cell, the resistance of the heating device, and the target temperature.

[0038] In an optional implementation, when the heating control parameter is the heating duration, the calculation formula corresponding to the value of the heating control parameter based on the parameters of the heating device and the parameters of the battery cell, the target temperature and the current temperature of the battery cell is:

[0039] t=m*Cp*V / (dT*I 2 *R);

[0040] When the heating control parameter is the heating current value, the calculation formula corresponding to the value of the heating control parameter based on the parameters of the heating device and the parameters of the battery cell, the target temperature and the current temperature of the battery cell is:

[0041] I = (m * Cp * V / (dT * t * R)) 0.5 ;

[0042] Where t represents the heating time, m represents the weight of the battery cell, Cp represents the specific heat capacity of the battery cell, V represents the heating rate of the cell, dT represents the difference between the target temperature and the current temperature of the battery cell, I represents the heating current value, and R represents the resistance of the heating device.

[0043] This optional implementation method can accurately calculate the heating time or heating current value using the above calculation formula.

[0044] In an optional implementation, when the temperature detection signal is generated based on detecting the four corners of the battery cell, the formula for determining the current temperature of the battery cell based on the temperature detection signal is:

[0045] Tup=(Ttemp2*(x2-x3)+Ttemp3*x3) / x2;

[0046] Among them, Ttemp3=(T4*y2+T2*(y1+y3)) / (y1+y2+y3), Ttemp2=(Ttemp1*y1+T0*y2) / (y1+y2), Ttemp1=(T1*x2+T2*x1) / (x1+x2);

[0047] Tup represents the current temperature of the battery cell, T1, T2, T3, and T4 represent the temperature sampling values ​​at the four corners, Ttemp1, Ttemp2, and Ttemp3 are the temperatures of the auxiliary calculation points, x1, x2, and x3 are the x-axis spacing, and y1, y2, and y3 are the y-axis spacing.

[0048] This optional implementation method, through the above calculation formula, can calculate the current temperature of the battery cell based on the temperature of the four corners of the battery cell, thereby improving the accuracy of the current temperature calculation.

[0049] In an optional implementation, controlling the temperature integrated sampling device to heat the battery cell based on the numerical value of the heating control parameters includes:

[0050] When the temperature integrated sampling device includes a first heating wire and a second heating wire, one of the first heating wire and the second heating wire is controlled as the current heating wire to heat the battery cell based on the value of the heating control parameters;

[0051] When the current heating wire is detected to have melted, the other heating wire of the first heating wire and the second heating wire is controlled to heat the battery cell.

[0052] In this optional embodiment, when one heating wire melts, another heating wire from the first heating wire and the second heating wire can be controlled to heat the battery cell continuously. Attached Figure Description

[0053] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a schematic diagram of the structure of an integrated temperature sampling device disclosed in an embodiment of this application;

[0055] Figure 2 This is a schematic diagram of the thickness direction of a temperature integrated sampling device disclosed in an embodiment of this application;

[0056] Figure 3 This is a schematic flowchart of a battery cell heating method disclosed in an embodiment of this application;

[0057] Figure 4 This is a schematic diagram showing the temperature points and their positional relationships in a temperature integrated sampling device disclosed in an embodiment of this application.

[0058] Icons: 10-Temperature sampling line; 20-Temperature sampling interface; 30-Heating device; 40-Heating interface device; 50-Temperature detection sensor; 60-Temperature sensor placement point; 70-First insulation part; 80-Second insulation part; 90-Third insulation part. Detailed Implementation

[0059] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0060] Example 1

[0061] Please see Figure 1 , Figure 1 This is a schematic diagram of a temperature integrated sampling device disclosed in an embodiment of this application, wherein the temperature integrated sampling device is used for integration inside the battery cell. Figure 1 As shown, the temperature integrated sampling device includes: a heating device 30, a temperature detection sensor 50, a heating interface device 40, a temperature sampling interface 20, and a temperature sampling line 10.

[0062] Temperature sensor 50 is used to detect the internal temperature of the battery cell and is electrically connected to temperature sampling interface 20 through temperature sampling line 10 so as to output temperature detection signal through temperature sampling interface 20.

[0063] The heating device 30 is used to heat the battery cell and is electrically connected to the heating interface device 40 to receive heating signals through the heating interface device 40 so that the internal temperature of the battery cell reaches the target temperature.

[0064] The temperature integrated sampling device of this application embodiment can be integrated inside the battery cell. Through the temperature detection sensor 50, temperature sampling interface 20, and temperature sampling line 10, it can detect the internal temperature of the battery cell. The internal temperature detection result is then used as the battery cell temperature detection result. Compared with existing technologies, this provides a more realistic and accurate battery cell temperature. Existing technologies, which determine battery cell temperature based on temperature detection at the battery cell busbar, cannot reflect the actual internal temperature of the battery cell because they are not based on internal temperature detection, resulting in low accuracy. Furthermore, this application embodiment directly heats the inside of the battery cell through the heating interface device 40 and the heating device 30, thereby integrating a heating function.

[0065] In this embodiment of the application, the inside of the battery cell is the cavity filled with electrolyte, that is, the temperature integrated sampling device extends into the cavity filled with electrolyte.

[0066] In this embodiment of the application, the heating interface device 40 and the temperature sampling interface 20 in the temperature integrated sampling device can be connected to the vehicle's control system, so that the control system can receive the temperature detection signal and output a heating signal based on the temperature detection signal, so as to make the internal temperature of the battery cell reach the target temperature through the heating signal.

[0067] In the embodiments of this application, the temperature detection sensor 50 can be a thermal resistance temperature detection sensor 50 or a thermal coupling temperature detection sensor 50, and the embodiments of this application do not limit it.

[0068] In this embodiment, the heating interface device 40 can be an electrical terminal, and the temperature sampling interface 20 can also be an electrical terminal.

[0069] In this embodiment, the temperature sampling line 10 may be a wire made of an alloy such as nickel-chromium.

[0070] In this embodiment of the application, as an optional implementation, the temperature integrated sampling device further includes at least two temperature sensor placement points 60, and the number of temperature detection sensors 50 is the same as the number of temperature sensor placement points 60, wherein multiple temperature detection sensors 50 share a single temperature sampling interface 20.

[0071] This optional implementation allows temperature sensors to be installed at at least two temperature sensor placement points 60, thereby acquiring temperatures at multiple locations and facilitating the calculation of the final internal temperature of the battery cell based on these multiple temperatures. Furthermore, having multiple temperature sensors 50 share a single temperature sampling interface 20 reduces wiring and simplifies the placement process.

[0072] For the above optional implementation, the temperature sensor placement point 60 can be a location with a fixed structure, for example, a location with a clip, through which the temperature detection sensor 50 can be fixed.

[0073] For the above optional implementation, having at least two temperature sensor placement points 60 can mean that the number of temperature sensor placement points 60 is 2, or it can mean that the number of temperature sensor placement points 60 is 3 or 4.

[0074] For the above optional implementation method, temperature sensor placement points 60 can be set at the four corners inside the battery cell, wherein the four corners inside the battery cell refer to the upper left corner, the upper right corner, the lower left corner, and the lower right corner inside the battery cell.

[0075] For the above optional implementation, multiple temperature detection sensors 50 sharing a single temperature sampling interface 20 means that multiple temperature detection sensors 50 are all connected to the same temperature sampling interface 20. For example, temperature detection sensor 50 and temperature detection sensor 50 are all connected to temperature detection sensor 50.

[0076] In this embodiment of the application, as an optional implementation, the heating device 30 includes a first heating wire and a second heating wire, and the heating interface device 40 includes an upper heating interface and a lower heating interface.

[0077] The first heating wire is used to heat the upper internal region of the battery cell, and the second heating wire is used to heat the lower internal region of the battery cell. The first heating wire is electrically connected to the upper heating interface, and the second heating wire is electrically connected to the lower heating interface.

[0078] This optional embodiment can supply power to the first heating wire and the second heating wire through the upper heating interface and the lower heating interface, respectively, so that the first heating wire heats the upper internal region of the battery cell and the lower internal region of the battery cell, thereby achieving heating of a part of the internal region of the battery cell.

[0079] Regarding the above-mentioned optional implementation methods, heating specific regions within the battery cell refers to independently controlling the first heating wire to heat the upper region of the battery cell, and independently controlling the second heating wire to heat the lower region of the battery cell. For example, heating can be differentiated based on the degree of temperature drop in the upper and lower regions of the battery cell.

[0080] For the above-mentioned optional implementation methods, the division of the inner upper region and the inner lower region of the battery cell can be determined according to the center line of the battery cell, that is, the part below the center line is the inner lower region of the battery cell, and the part above the center line is the inner upper region of the battery cell.

[0081] In this embodiment of the application, as an optional implementation, the diameter of the temperature sampling line 10 is in the range of 0.03-0.15mm, and the diameters of the first heating wire and the second heating wire are both in the range of 0.03-0.15mm. The diameters of the first heating wire and the second heating wire are consistent with the diameter of the temperature sampling line 10.

[0082] In this optional embodiment, the wire diameter of the temperature sampling line 10 is set to 0.03-0.15mm, and the wire diameters of both the first heating wire and the second heating wire are set to 0.03-0.15mm. This facilitates reducing the overall thickness of the temperature integrated sampling device, allowing it to fit within the limited space inside the battery cell. Furthermore, the combination of the 0.03-0.15mm wire diameter of the temperature sampling line 10 with other wire diameters ensures that the large surfaces of the temperature integrated sampling device are as flat as possible, guaranteeing the flatness of the large surfaces of the temperature integrated sampling device.

[0083] Regarding the above-mentioned optional implementation method, since the space inside the battery cell is limited, the overall thickness of the temperature sampling device needs to be controlled. The overall thickness of the integrated temperature sampling device is within the range of 0.15-0.45mm. Based on this thickness, the wire diameter range of the temperature sampling line 10 is set to 0.03-0.15mm, and the wire diameter range of the first heating wire and the second heating wire is also set to 0.03-0.15mm. This satisfies the requirement that the overall thickness of the integrated temperature sampling device is within the range of 0.15-0.45mm, thereby facilitating the reduction of the overall thickness of the integrated temperature sampling device.

[0084] In this embodiment of the application, as an optional implementation, both the first heating wire and the second heating wire are metal resistance wires, wherein the calculation formula for the arrangement length of the metal resistance wire is:

[0085] L=R*πd 2 / (4*ρ);

[0086] Where L represents the length of the metal resistance wire, R represents the internal resistance of the metal resistance wire, d represents the diameter of the metal resistance wire (the diameter of the metal resistance wire is a value within the range of wire diameter), ρ represents the resistivity of the metal resistance wire, and π represents pi.

[0087] This optional implementation method can calculate the arrangement length of the metal resistance wire based on the above calculation formula, according to the diameter, internal resistance, and wire diameter range of the metal resistance wire.

[0088] In this application embodiment, as an optional implementation method, please refer to... Figure 2 , Figure 2 This is a schematic diagram of the thickness direction of a temperature integrated sampling device disclosed in an embodiment of this application. Figure 2 As shown,

[0089] The temperature integrated sampling device also includes a first insulating part 70 and a second insulating part 80;

[0090] The first insulating part 70 is disposed on the left side of the temperature sampling line 10 and is used to wrap the left side of the temperature sampling line 10.

[0091] The second insulating part 80 is provided on the right side of the temperature sampling line 10 and is used to wrap the right side of the temperature sampling line 10.

[0092] In this optional embodiment, the first insulating part 70 can prevent the left side of the temperature sampling line 10 from contacting the electrolyte inside the cell, and the first insulating part 70 can also prevent the right side of the temperature sampling line 10 from contacting the electrolyte inside the cell.

[0093] In an optional embodiment, the thickness of the first insulating portion 70 and the second insulating portion 80 is 0.06~0.15mm.

[0094] In this optional embodiment, the thickness of the first insulating part 70 and the second insulating part 80 is set to 0.06~0.15mm. This allows the thickness of the first insulating part 70 and the second insulating part 80 to be as thin as possible while ensuring the insulating function of the first insulating part 70 and the second insulating part 80, so as to adapt to the narrow space inside the electrical component.

[0095] In an optional embodiment, the temperature integrated sampling device further includes a third insulating part 90, wherein the third insulating part 90 is disposed between the first insulating part 70 and the second insulating part 80, for isolating the temperature sampling line 10 from the electrolyte inside the battery cell and filling the gap between the first insulating part 70 and the second insulating part 80.

[0096] In this optional embodiment, the third insulating part 90 can cooperate with the first insulating part 70 and the second insulating part 80 to completely isolate the temperature sampling line 10 from the electrolyte, thereby improving insulation performance. On the other hand, the third insulating part 90 can also fill the gap between the first insulating part 70 and the second insulating part 80, ensuring the flatness of the large surfaces on both sides of the temperature integrated sampling device. During long-term use inside the battery cell, uneven surfaces will not cause uneven stress on the internal electrodes, resulting in unexpected risks such as wrinkling and lithium plating, thus ensuring the safe and reliable use of the battery cell.

[0097] Example 2

[0098] Please see Figure 3 , Figure 3 This is a schematic flowchart of a cell heating method disclosed in an embodiment of this application, wherein the method is applied to a temperature integrated sampling device as described in any of the foregoing embodiments. Figure 3 As shown, the method in this application embodiment includes the following steps:

[0099] 101. Obtain the temperature detection signal generated by the temperature integrated sampling device to detect the inside of the battery cell, and determine the current temperature of the battery cell based on the temperature detection signal;

[0100] 102. Determine heating control parameters based on control mode;

[0101] 103. Calculate the values ​​of heating control parameters based on the parameters of the heating device and the battery cell, the target temperature and the current temperature of the battery cell;

[0102] 104. A numerical control temperature integrated sampling device based on heating control parameters heats the battery cell to the target temperature through the temperature integrated sampling device.

[0103] This application embodiment can acquire the temperature detection signal generated by the temperature integrated sampling device detecting the inside of the battery cell, and determine the current temperature of the battery cell based on the temperature detection signal. Then, it can determine the heating control parameters based on the control mode, and calculate the value of the heating control parameters based on the parameters of the heating device and the parameters of the battery cell, the target temperature and the current temperature of the battery cell. Then, it can control the temperature integrated sampling device to heat the battery cell based on the value of the heating control parameters, so as to heat the battery cell to the target temperature through the temperature integrated sampling device.

[0104] In this application embodiment, as an optional implementation, the parameters of the battery cell include the weight of the battery cell, the specific heat capacity of the battery cell, and the heating rate of the battery cell, and the parameters of the heating device include the resistance of the heating device.

[0105] And, the steps: determining heating control parameters based on the control mode, including the following sub-steps:

[0106] When the control mode is fixed heating current mode, the heating control parameter is heating duration;

[0107] When the control mode is fixed heating time mode, the heating control parameter is the heating current value.

[0108] This optional implementation can use the heating duration as the heating control parameter when the control mode is a fixed heating current value mode, and use the heating current value as the heating control parameter when the control mode is a fixed heating duration mode. On the other hand, this optional implementation can calculate the heating control parameters based on the weight of the battery cell, the specific heat capacity of the battery cell, the heating rate of the battery cell, the resistance of the heating device, and the target temperature.

[0109] In this embodiment of the application, as an optional implementation, when the heating control parameter is the heating duration, the calculation formula corresponding to the value of the heating control parameter calculated based on the parameters of the heating device and the parameters of the battery cell, the target temperature and the current temperature of the battery cell is as follows:

[0110] t=m*Cp*V / (dT*I 2 *R);

[0111] When the heating control parameter is the heating current value, the calculation formula corresponding to the value of the heating control parameter, based on the parameters of the heating device and the battery cell, the target temperature and the current temperature of the battery cell, is as follows:

[0112] I = (m * Cp * V / (dT * t * R)) 0.5 ;

[0113] Where t represents the heating time, m represents the weight of the battery cell, Cp represents the specific heat capacity of the battery cell, V represents the heating rate of the cell, dT represents the difference between the target temperature and the current temperature of the battery cell, I represents the heating current value, and R represents the resistance of the heating device.

[0114] This optional implementation method can accurately calculate the heating time or heating current value using the above calculation formula.

[0115] In an optional implementation, when the temperature detection signal is generated based on the four corners of the battery cell, the formula for determining the current temperature of the battery cell based on the temperature detection signal is:

[0116] Tup=(Ttemp2*(x2-x3)+Ttemp3*x3) / x2;

[0117] Among them, Ttemp3=(T4*y2+T2*(y1+y3)) / (y1+y2+y3), Ttemp2=(Ttemp1*y1+T0*y2) / (y1+y2), Ttemp1=(T1*x2+T2*x1) / (x1+x2);

[0118] Furthermore, such as Figure 4As shown, Tup represents the current temperature of the battery cell, T1, T2, T3, and T4 represent the temperature sampling values ​​at the four corners, Ttemp1, Ttemp2, and Ttemp3 are the temperatures of the auxiliary calculation points, x1, x2, and x3 are the x-axis spacing, and y1, y2, and y3 are the y-axis spacing. It should be noted that... Figure 4 This is a schematic diagram showing the temperature points and their positional relationships in a temperature integrated sampling device disclosed in an embodiment of this application.

[0119] This optional implementation method, through the above calculation formula, can calculate the current temperature of the battery cell based on the temperature of the four corners of the battery cell, thereby improving the accuracy of the current temperature calculation.

[0120] In this embodiment of the application, as an optional implementation, the battery cell is heated by a numerically controlled temperature sampling device based on heating control parameters, including the following steps:

[0121] When the temperature integrated sampling device includes a first heating wire and a second heating wire, one of the first heating wire and the second heating wire is controlled as the current heating wire to heat the battery cell based on the value of the heating control parameters;

[0122] When the current heating wire is detected to have melted, the other heating wire among the first and second heating wires is controlled to heat the battery cell.

[0123] This optional implementation allows for the control of another heating wire (either the first or second heating wire) to heat the battery cell continuously when one heating wire melts. It should be noted that the heating wire melts in a scenario where heating the electrical components is required to trigger thermal runaway of the battery cell. In this scenario, triggering thermal runaway typically requires a large current, which can cause the heating wire to melt. Based on this scenario, by controlling the other heating wire (either the first or second heating wire) to heat the battery cell, the other heating wire can be activated to heat the battery cell when one heating wire melts, thus triggering thermal runaway.

[0124] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and there may be other division methods in actual implementation. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the coupling or direct coupling or communication connection shown or discussed may be through some communication interface; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0125] Furthermore, the units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0126] Furthermore, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0127] It should be noted that if a function is implemented as a software module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0128] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0129] The above are merely embodiments of this application and are not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A temperature integrated sampling device, characterized in that, The temperature integrated sampling device is used to be integrated inside the battery cell. The temperature integrated sampling device includes: a heating device, a temperature detection sensor, a heating interface device, a temperature sampling interface, and a temperature sampling line. The temperature detection sensor is used to detect the internal temperature of the battery cell and is electrically connected to the temperature sampling interface through the temperature sampling line so as to output a temperature detection signal through the temperature sampling interface; The heating device is used to heat the battery cell and is electrically connected to the heating interface device to receive a heating signal through the heating interface device, so that the internal temperature of the battery cell reaches the target temperature. Furthermore, the heating device includes a first heating wire and a second heating wire, and the heating interface device includes an upper heating interface and a lower heating interface; The first heating wire is used to heat the upper internal region of the battery cell, and the second heating wire is used to heat the lower internal region of the battery cell. The first heating wire is electrically connected to the upper heating interface, and the second heating wire is electrically connected to the lower heating interface.

2. The temperature integrated sampling device as described in claim 1, characterized in that, The temperature integrated sampling device further includes at least two temperature sensor deployment points, and the number of temperature detection sensors is the same as the number of temperature sensor deployment points, wherein multiple temperature detection sensors share one temperature sampling interface.

3. The temperature integrated sampling device as described in claim 1, characterized in that, The diameter of the temperature sampling line is in the range of 0.03-0.15 mm, and the diameters of the first heating wire and the second heating wire are both in the range of 0.03-0.15 mm. The diameters of the first heating wire and the second heating wire are the same as the diameter of the temperature sampling line.

4. The temperature integrated sampling device as described in claim 3, characterized in that, Both the first heating wire and the second heating wire are metal resistance wires, wherein the formula for calculating the arrangement length of the metal resistance wire is: L=R*πd 2 / (4*p); Wherein, L represents the arrangement length of the metal resistance wire, R represents the internal resistance of the metal resistance wire, d represents the diameter of the metal resistance wire (the diameter of the metal resistance wire is a value within the range of wire diameter), ρ represents the resistivity of the metal resistance wire, and π represents pi.

5. The temperature integrated sampling device as described in claim 1, characterized in that, The temperature integrated sampling device also includes a first insulating part and a second insulating part; The first insulating part is disposed on the left side of the temperature sampling line and is used to wrap the left side of the temperature sampling line. The second insulating part is disposed on the right side of the temperature sampling line and is used to wrap the right side of the temperature sampling line.

6. The temperature integrated sampling device as described in claim 5, characterized in that, The thickness of the first insulating part and the second insulating part is 0.06~0.15mm.

7. The temperature integrated sampling device as described in claim 5, characterized in that, The temperature integrated sampling device further includes a third insulating part, wherein the third insulating part is disposed between the first insulating part and the second insulating part, for isolating the temperature sampling line from the electrolyte inside the battery cell and filling the gap between the first insulating part and the second insulating part.

8. A method for heating a battery cell, characterized in that, The method is applied to the temperature integrated sampling device as described in any one of claims 1-7, and the method includes: The temperature detection signal generated by the integrated temperature sampling device to detect the inside of the battery cell is acquired, and the current temperature of the battery cell is determined based on the temperature detection signal; Heating control parameters are determined based on the control mode; The values ​​of the heating control parameters are calculated based on the parameters of the heating device and the parameters of the battery cell, the target temperature and the current temperature of the battery cell; Based on the numerical values ​​of the heating control parameters, the temperature integrated sampling device is used to heat the battery cell to the target temperature.

9. The method as described in claim 8, characterized in that, The parameters of the battery cell include the weight of the battery cell, the specific heat capacity of the battery cell, and the heating rate of the battery cell; the parameters of the heating device include the resistance of the heating device. And, the determination of heating control parameters based on the control mode includes: When the control mode is a fixed heating current mode, the heating control parameter is the heating duration; When the control mode is a fixed heating time mode, the heating control parameter is the heating current value.

10. The method as described in claim 9, characterized in that, When the heating control parameter is the heating duration, the calculation formula corresponding to the value of the heating control parameter based on the parameters of the heating device and the parameters of the battery cell, the target temperature and the current temperature of the battery cell is: t=m*Cp*V / (dT*I 2 *R); When the heating control parameter is the heating current value, the calculation formula corresponding to the value of the heating control parameter based on the parameters of the heating device and the parameters of the battery cell, the target temperature and the current temperature of the battery cell is: I=(m*Cp*V / (dT*t*R)) 0.5 ; Where t represents the heating time, m represents the weight of the battery cell, Cp represents the specific heat capacity of the battery cell, V represents the heating rate of the cell, dT represents the difference between the target temperature and the current temperature of the battery cell, I represents the heating current value, and R represents the resistance of the heating device.

11. The method as described in claim 8, characterized in that, When the temperature detection signal is generated based on detecting the four corners of the battery cell, the formula for determining the current temperature of the battery cell based on the temperature detection signal is: Tup=(Ttemp2*(x2-x3)+Ttemp3*x3) / x2; Among them, Ttemp3=(T4*y2+T2*(y1+y3)) / (y1+y2+y3), Ttemp2=(Ttemp1*y1+T0*y2) / (y1+y2), Ttemp1=(T1*x2+T2*x1) / (x1+x2); Tup represents the current temperature of the battery cell, T1, T2, T3, and T4 represent the temperature sampling values ​​at the four corners, Ttemp1, Ttemp2, and Ttemp3 are the temperatures of the auxiliary calculation points, x1, x2, and x3 are the x-axis spacing, and y1, y2, and y3 are the y-axis spacing.

12. The method as described in claim 8, characterized in that, The method of controlling the temperature integrated sampling device to heat the battery cell based on the numerical values ​​of the heating control parameters includes: When the temperature integrated sampling device includes a first heating wire and a second heating wire, one of the first heating wire and the second heating wire is controlled as the current heating wire to heat the battery cell based on the value of the heating control parameters; When the current heating wire is detected to have melted, the other heating wire of the first heating wire and the second heating wire is controlled to heat the battery cell.

Images