Battery temperature detection method, device, computer equipment, medium and program product

Abstract

The present invention relates to the field of battery technology, and discloses a battery temperature detection method, device, computer equipment, medium and program product. The method comprises: collecting a first temperature at a first position on the outer surface of a battery cell; obtaining a conduction distance from the first position on the outer surface of the battery cell to a second position inside the battery; and calculating a second temperature at the second position based on the first temperature and the conduction distance. Thus, the temperature inside the battery can be used to perform temperature-related judgments and other operations. The method effectively avoids the problems of time lag and misjudgment of temperature detection in related technologies, effectively improves the rapidity and accuracy of detecting battery temperature changes, and provides safe and reliable guarantees for the execution of battery temperature alarms and protection strategies.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery temperature detection method, device, computer equipment, medium and program product. Background Art

[0002] At present, the temperature detection in the working process of lithium batteries mostly uses NTC (Negative Temperature Coefficient thermistor) fixed on the pole or shell surface of the battery cell, and the temperature of the battery cell surface is used as the current working temperature of the battery cell. However, during the charging and discharging of lithium battery cells, the temperature of the battery cell is first generated from its interior. Because the internal heat dissipation is poor, the internal temperature rises quickly, and the heat is conducted along the direction of any temperature gradient. The temperature conducted to the battery surface is significantly lower than the internal battery temperature. Therefore, the temperature difference between the inside and outside of the battery is too large. Using the temperature of the battery surface as the basis for temperature alarm and protection fault judgment will inevitably bring serious time lag and misjudgment, which will have a serious impact on the timely power reduction of battery charging and discharging, the cooling thermal management of the battery, and the real-time action of disconnecting the charging and discharging relay. At the same time, it also has a serious impact on the thermal runaway protection and overall cycle life of the battery. Therefore, how to reasonably and accurately detect the battery temperature has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] In view of this, the present invention provides a battery temperature detection method, device, computer equipment, medium and program product to solve the technical problem of how to reasonably and accurately detect the battery temperature, which has become an urgent problem to be solved.

[0004] In a first aspect, the present invention provides a battery temperature detection method, the method comprising:

[0005] Collecting a first temperature at a first position on an outer surface of a battery cell of the battery;

[0006] Obtaining a conduction distance from a first position on an outer surface of a battery cell of a battery to a second position inside the battery;

[0007] Based on the first temperature and the conduction distance, a second temperature at the second location is calculated.

[0008] The battery temperature detection method of the present invention collects the first temperature of the first position on the outer surface of the battery cell, and obtains the conduction distance from the first position on the outer surface of the battery cell to the second position inside the battery, thereby calculating the second temperature at the second position based on the temperature change principle of the battery cell during the temperature conduction process in any direction, based on the first temperature and the conduction distance. Therefore, the temperature inside the battery can be used to perform temperature-related judgments and other operations. It effectively avoids the problems of time lag and misjudgment of temperature detection in related technologies, not only effectively improves the rapidity and accuracy of detecting battery temperature changes, but also provides safe and reliable guarantees for the execution of battery temperature alarms and protection strategies.

[0009] In an optional implementation, the following formula (1) is used to calculate the second temperature at the second position based on the first temperature and the conduction distance:

[0010]

[0011] Wherein, T(l) represents the temperature of a second position inside the battery of uniform dielectric material;

[0012] T0 represents a first temperature at a first position on the outer surface of a battery cell of the battery;

[0013] I represents the current passing through the battery cell;

[0014] R represents the internal resistance of the battery cell;

[0015] l represents the conduction distance from a first position on the outer surface of the battery cell to a second position inside the battery;

[0016] λ represents the thermal conductivity of the battery cell of a uniform dielectric material;

[0017] S represents the cross-sectional area of ​​the battery cell.

[0018] The battery temperature detection method of the present invention, according to the law of conservation of energy, equates the thermal power of the battery to the sum of the reaction thermal power of the battery, the ohmic thermal power of the battery and the polarization thermal power, and then obtains the above formula through linear integration, quantifies the heating value of the battery cell, and quickly and accurately calculates the temperature inside the battery cell based on the easily collected temperature outside the battery cell, effectively avoiding the problems of time lag and misjudgment of temperature detection in related technologies, and not only effectively improving the rapidity and accuracy of detecting battery temperature changes, but also providing safe and reliable protection for the execution of battery temperature alarm and protection strategies.

[0019] In an optional embodiment, the battery cell is an aluminum shell cylindrical;

[0020] The cross-sectional area of ​​the battery cell is calculated using the following formula (2):

[0021] S=πr 2 (2)

[0022] Wherein, S represents the cross-sectional area of ​​the battery cell;

[0023] π represents pi;

[0024] r represents the radius of the circular cross section of the cylinder.

[0025] In an optional embodiment, the battery cell is a square aluminum shell;

[0026] The cross-sectional area of ​​the battery cell is calculated using the following formula (3):

[0027] S=LW (3)

[0028] Wherein, S represents the cross-sectional area of ​​the battery cell;

[0029] L represents the length of the square cross section of the battery;

[0030] W represents the width of the square cross section of the battery.

[0031] In an optional embodiment, the battery cell is a square soft pack;

[0032] The cross-sectional area of ​​the battery cell is calculated using the following formula (4):

[0033] S=LH (4)

[0034] Wherein, S represents the cross-sectional area of ​​the battery cell;

[0035] L represents the length of the square cross section of the battery;

[0036] W represents the thickness of the square cross section of the battery.

[0037] The battery temperature detection method of the present invention selects a suitable cross-sectional area calculation method according to different battery cell shapes and materials, reasonably determines the cross-sectional area of ​​the battery cell, and further determines a more accurate second temperature of a second position inside the battery.

[0038] In an optional implementation, collecting a first temperature at a first position on an outer surface of a battery cell of the battery includes one of the following:

[0039] The battery cell is an aluminum cylindrical shell, and the first temperature is collected by a negative temperature coefficient thermistor installed on the top of the pole along the central axis of the cylinder;

[0040] The battery cell is a square aluminum shell, and the first temperature is collected by a negative temperature coefficient thermistor installed on the top of the pole along the central axis of the square;

[0041] The battery is a square soft pack, and the first temperature is collected by a negative temperature coefficient thermistor installed on the top of the pole along a direction parallel to the central axis.

[0042] The battery temperature detection method of the present invention selects a suitable first temperature collection position on the outer surface of the battery cell according to different battery cell shapes and materials, effectively improving the accuracy of the first temperature collection, thereby determining a more accurate second temperature at a second position inside the battery.

[0043] In a second aspect, the present invention provides a battery temperature detection device, the device comprising:

[0044] A collection module, used for collecting a first temperature at a first position on an outer surface of a battery cell of the battery;

[0045] An acquisition module, used to acquire a conduction distance from a first position on the outer surface of a battery cell of the battery to a second position inside the battery;

[0046] The calculation module is used to calculate a second temperature at a second position based on the first temperature and the conduction distance.

[0047] In a third aspect, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the battery temperature detection method of the first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0048] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the battery temperature detection method of the first aspect or any corresponding embodiment thereof.

[0049] In a fifth aspect, the present invention provides a computer program product, including computer instructions, and the computer instructions are used to enable a computer to execute the battery temperature detection method of the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1a It is a schematic diagram of the physical structure of an aluminum shell cylindrical lithium battery;

[0052] Figure 1bIt is a schematic diagram of the physical structure of an aluminum-shell square lithium battery;

[0053] Figure 1c It is a physical structure diagram of a soft-pack square lithium battery;

[0054] Figure 2 is a flow chart of a battery temperature detection method according to an embodiment of the present invention;

[0055] Figure 3 is a flow chart of another battery temperature detection method according to an embodiment of the present invention;

[0056] Figure 4 is a flow chart of another battery temperature detection method according to an embodiment of the present invention;

[0057] Figure 5 is a flow chart of another battery temperature detection method according to an embodiment of the present invention;

[0058] Figure 6a It is a schematic diagram of the structure of a cylindrical structure model;

[0059] Figure 6b It is a schematic diagram of the structure of a square aluminum shell structure model;

[0060] Figure 6c It is a schematic diagram of the structure model of a square soft-pack battery;

[0061] Figure 7 is a structural block diagram of a battery temperature detection device according to an embodiment of the present invention;

[0062] Figure 8 It is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0064] In order to better explain the solution, here we first explain in detail the temperature collection method in the relevant technology. The details are as follows:

[0065] Figure 1a It is a physical structure diagram of an aluminum shell cylindrical lithium battery. Figure 1aAs shown, for the lithium battery with this physical structure, the NTC sensor can be fixed near the positive pole A position. The temperature detected at position A is T1, and the heat conduction in the axial direction of the cylinder is transferred from the inside to the outside, so the internal temperature T2>T1. In the existing lithium battery temperature alarm and protection judgment strategy, the temperature T1 detected at position A can be compared with the temperature alarm threshold and the temperature protection threshold respectively to determine whether the current lithium battery has a temperature alarm and protection fault.

[0066] Figure 1b This is a schematic diagram of the physical structure of an aluminum-shell square lithium battery. Figure 1b As shown, for the lithium battery with this physical structure, the NTC sensor can be fixed near the positive pole B. The temperature detected at position B is T1, and the heat conduction in the axial direction of the cylinder is transferred from the inside to the outside, so the internal temperature T2>T1. In the existing lithium battery temperature alarm and protection judgment strategy, the temperature T1 detected at position B can be compared with the temperature alarm threshold and the temperature protection threshold to determine whether the current lithium battery has a temperature alarm and protection fault.

[0067] Figure 1c It is a physical structure diagram of a soft-pack square lithium battery. Figure 1c As shown, for lithium batteries with this physical structure, the NTC sensor is generally fixed near the positive pole C position, and the temperature detected at the C position is T1. The heat conduction in the axial direction of the cylinder is transferred from the inside to the outside, so the internal temperature T2>T1. In the existing lithium battery temperature alarm and protection judgment strategy, the temperature T1 detected at the C position can be compared with the temperature alarm threshold and the temperature protection threshold to determine whether the current lithium battery has a temperature alarm and protection fault.

[0068] The above-mentioned temperature detection methods all use the surface temperature of the battery cell as the current operating temperature of the battery cell. However, during the charging and discharging of lithium battery cells, the temperature of the battery cell is first generated from the inside. Because the internal heat dissipation is poor, the internal temperature rises quickly, and the heat is conducted along the direction of any temperature gradient. The temperature conducted to the surface of the battery is significantly lower than the internal battery temperature. Therefore, the temperature difference between the inside and outside of the battery is too large. Using the surface temperature of the battery as the basis for temperature alarm and protection fault judgment will inevitably bring serious time lag and misjudgment, which will have a serious impact on the timely power reduction of battery charging and discharging, the cooling thermal management of the battery, and the real-time action of disconnecting the charging and discharging relay. At the same time, it will also have a serious impact on the thermal runaway protection and overall cycle life of the battery.

[0069] Based on this, the present invention provides a battery temperature detection method to solve the technical problem of how to reasonably and accurately detect the battery temperature, which has become an urgent problem to be solved.

[0070] According to an embodiment of the present invention, an embodiment of a battery temperature detection method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0071] In this embodiment, a battery temperature detection method is provided, which can be used in mobile terminals such as mobile phones and tablet computers, and computer devices such as desktop computers and laptop computers. Figure 2 is a flow chart of a battery temperature detection method according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps:

[0072] Step S201 , collecting a first temperature at a first position on an outer surface of a battery cell of a battery.

[0073] In some optional implementations, the above Figure 1a Middle A position, Figure 1b Middle B position or Figure 1c The middle C position is used as the first position, and the NTC sensor is fixed at the first position to collect the first temperature of the first position.

[0074] Step S202, obtaining a conduction distance from a first position on the outer surface of a battery cell to a second position inside the battery.

[0075] Here, the specific positions of the first position and the second position can be selected according to actual needs. The basis for selecting the first position is to maximize the use of the position where the NTC sensor is arranged in the relevant technology, avoid changes to the lithium battery structure and connection relationship, reduce labor and material waste caused by improvements to the structure or circuit of the lithium battery itself, and maintain the stability of the battery itself.

[0076] The second position is selected based on the maximum internal temperature of the battery cell. Therefore, the second position can usually be selected at the center of the battery cell. Here, the center position emphasizes the geometric center of the battery cell. For example, the second position of a cylindrical battery cell can be selected in the following way: first, take a center circle that is parallel to the top circle and the bottom circle of the cylinder and is equidistant from the top circle and the bottom circle, and then select the center position of the center circle.

[0077] Step S203: calculating a second temperature at a second position based on the first temperature and the conduction distance.

[0078] In some optional implementations, the scheme can be described by taking a lithium battery made of a uniform dielectric material as an example. The conduction distance from the inside to the outside of the lithium battery made of a uniform dielectric material is l, and the inside temperature and the outside temperature are T1 and T2 respectively, where T1>T2, and the temperature difference between the two is Δ, Δ=T1-T2.

[0079] Among them, heat is transferred from the high temperature T1 side of the battery to the low temperature T2 side by conduction. Therefore, the temperature transferred per unit distance can be defined as the temperature gradient. The amount of heat that passes through per unit time

[0080] Among them, λ represents the thermal conductivity, and the heat per unit time is called thermal power.

[0081] It should be noted that the inside of the lithium battery is the second position, the outside is the first position, the inside temperature is the second temperature, and the outside temperature is the first temperature.

[0082] According to the law of conservation of energy, the thermal power of a battery can be equivalent to the sum of the reaction thermal power, ohmic thermal power and polarization thermal power of the battery. The internal resistance of the battery cell is defined as r, and the content of the battery cell can be the sum of the ohmic resistance and the polarization resistance. The current passing through the battery cell is I, and the internal resistance of the battery cell is R, then the electrical power is

[0083] Furthermore, through linear integration we can get: The meaning of each parameter is referred to in the following formula (1), which will not be repeated here.

[0084] In an optional implementation, the following formula (1) is used to calculate the second temperature at the second position based on the first temperature and the conduction distance:

[0085] The temperature at the second location

[0086] Wherein, T(l) represents the temperature of a second position inside the battery of uniform dielectric material;

[0087] T0 represents a first temperature at a first position on the outer surface of a battery cell of the battery;

[0088] I represents the current passing through the battery cell;

[0089] R represents the internal resistance of the battery cell;

[0090] l represents the conduction distance from a first position on the outer surface of the battery cell to a second position inside the battery;

[0091] λ represents the thermal conductivity of the battery cell of a uniform dielectric material;

[0092] S represents the cross-sectional area of ​​the battery cell.

[0093] In this embodiment, a battery temperature detection method is provided, which can be used in the above-mentioned mobile terminals, such as mobile phones, tablet computers, etc. Figure 3 is a flow chart of a battery temperature detection method according to an embodiment of the present invention. Figure 3 As shown, the process includes the following steps:

[0094] Step S301 , collecting a first temperature at a first position on an outer surface of a battery cell of a battery.

[0095] The battery cell is an aluminum cylindrical shell, and the first temperature can be collected by a negative temperature coefficient thermistor installed on the top of the pole along the central axis of the cylinder. Figure 1a A position shown.

[0096] Step S302, obtaining a conduction distance from a first position on the outer surface of a battery cell to a second position inside the battery.

[0097] For details, please see Figure 2 Step S202 of the illustrated embodiment will not be described in detail here.

[0098] Step S303: calculating a second temperature at a second position based on the first temperature and the conduction distance.

[0099] For example, we can construct Figure 6a The cylindrical structure model is a cylindrical structure model, the radius of the cylindrical structure is r, the height of the cylinder is h, the distance from the position where the first temperature T1 is collected to the second position is l, the thermal conductivity of the battery cell is λ, and the battery internal resistance can include the sum of the ohmic internal resistance and the polarization internal resistance, recorded as R. Among them, the NTC is installed on the top of the pole along the central axis of the cylinder, and the temperature at this position is T1. Here, the cross-sectional area of ​​the battery cell can be first calculated using the following formula (2):

[0100] S=πr 2 (2)

[0101] Wherein, S represents the cross-sectional area of ​​the battery cell;

[0102] π represents pi;

[0103] r represents the radius of the circular cross section of the cylinder.

[0104] Furthermore, the second temperature T2 at the second position can be calculated based on the temperature gradient in the axial direction of the cylinder:

[0105] In this embodiment, a battery temperature detection method is provided, which can be used in the above-mentioned mobile terminals, such as mobile phones, tablet computers, etc. Figure 4 is a flow chart of a battery temperature detection method according to an embodiment of the present invention. Figure 4 As shown, the process includes the following steps:

[0106] Step S401 , collecting a first temperature at a first position on an outer surface of a battery cell of a battery.

[0107] The battery cell is a square aluminum shell, and the first temperature can be collected by a negative temperature coefficient thermistor installed on the top of the pole along the central axis of the square. Figure 1b Position B shown.

[0108] Step S402, obtaining a conduction distance from a first position on the outer surface of a battery cell to a second position inside the battery.

[0109] For details, please see Figure 2 Step S202 of the illustrated embodiment will not be described in detail here.

[0110] Step S403: calculating a second temperature at a second position based on the first temperature and the conduction distance.

[0111] For example, we can construct Figure 6b The square aluminum shell structure model has a length of L, a width of W, and a height of H. The distance l from the position where the first temperature T1 is collected to the second position, the thermal conductivity of the square battery is λ, and the battery internal resistance can include the sum of the ohmic internal resistance and the polarization internal resistance, which is recorded as R. Among them, the NTC is installed on the top of the pole along the central axis of the square, and the temperature at this position is T1.

[0112] The cross-sectional area of ​​the battery cell is calculated using the following formula (3):

[0113] S=LW (3)

[0114] Wherein, S represents the cross-sectional area of ​​the battery cell;

[0115] L represents the length of the square cross section of the battery;

[0116] W represents the width of the square cross section of the battery.

[0117] Furthermore, the second temperature T2 at the second position can be obtained according to the temperature gradient in the square axis.

[0118] In this embodiment, a battery temperature detection method is provided, which can be used in the above-mentioned mobile terminals, such as mobile phones, tablet computers, etc. Figure 5 is a flow chart of a battery temperature detection method according to an embodiment of the present invention. Figure 5 As shown, the process includes the following steps:

[0119] Step S501 , collecting a first temperature at a first position on an outer surface of a battery cell of a battery.

[0120] The battery is a square soft pack. The first temperature can be collected by a negative temperature coefficient thermistor installed on the top of the pole parallel to the central axis. For details, please refer to Figure 1b Position B shown.

[0121] Step S502 , obtaining a conduction distance from a first position on the outer surface of a battery cell to a second position inside the battery.

[0122] For details, please see Figure 2 Step S102 of the illustrated embodiment will not be described in detail here.

[0123] Step S503: calculating a second temperature at a second position based on the first temperature and the conduction distance.

[0124] For example, we can construct Figure 6c The square soft pack battery structure model has a length of L, a width of W, a thickness of H, a distance l from the position where the first temperature T1 is collected to the second position, a thermal conductivity of the square battery is λ, and the battery internal resistance can include the sum of the ohmic internal resistance and the polarization internal resistance, recorded as R. Among them, the NTC is installed on the top of the pole parallel to the central axis, and the temperature at this position is T1.

[0125] The cross-sectional area of ​​the battery cell is calculated using the following formula (4):

[0126] S=LH (4)

[0127] Wherein, S represents the cross-sectional area of ​​the battery cell;

[0128] L represents the length of the square cross section of the battery;

[0129] W represents the thickness of the square cross section of the battery.

[0130] Furthermore, the second temperature T2 at the second position can be calculated based on the temperature gradient in the axial direction of the square soft package to obtain

[0131] In this embodiment, a battery temperature detection device is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0132] Therefore, the battery temperature detection method of the present invention selects a suitable first temperature collection position on the outer surface of the battery cell and a suitable cross-sectional area calculation method for different battery cell shapes and materials, reasonably determines the cross-sectional area of ​​the battery cell, and further determines a more accurate second temperature at a second position inside the battery.

[0133] Based on the above scheme, the battery temperature detection method of the present invention collects the first temperature of the first position of the outer surface of the battery cell, and obtains the conduction distance from the first position of the outer surface of the battery cell to the second position inside the battery, thereby calculating the second temperature of the second position based on the temperature change principle of the battery cell in the temperature conduction process in any direction, based on the first temperature and the conduction distance. Therefore, the temperature inside the battery can be used to perform temperature-related judgments and other operations. It effectively avoids the problems of time lag and misjudgment of temperature detection in related technologies, not only effectively improves the rapidity and accuracy of detecting battery temperature changes, but also provides safe and reliable guarantees for the execution of battery temperature alarms and protection strategies. It provides a fast and accurate execution basis for the charge and discharge power reduction and the disconnection response action of the charge and discharge relay under battery thermal management, which not only effectively reduces the risk of battery thermal runaway, but also indirectly improves the overall cycle life of the lithium battery.

[0134] This embodiment provides a battery temperature detection device, such as Figure 7 As shown, including:

[0135] A collection module 701 is used to collect a first temperature at a first position on the outer surface of a battery cell of the battery;

[0136] An acquisition module 702 is used to acquire a conduction distance from a first position on the outer surface of a battery cell of the battery to a second position inside the battery;

[0137] The calculation module 703 is used to calculate the second temperature at the second position based on the first temperature and the conduction distance.

[0138] In an optional implementation, the following formula (1) is used to calculate the second temperature at the second position based on the first temperature and the conduction distance:

[0139]

[0140] Wherein, T(l) represents the temperature of a second position inside the battery of uniform dielectric material;

[0141] T0 represents a first temperature at a first position on the outer surface of a battery cell of the battery;

[0142] I represents the current passing through the battery cell;

[0143] R represents the internal resistance of the battery cell;

[0144] l represents the conduction distance from a first position on the outer surface of the battery cell to a second position inside the battery;

[0145] λ represents the thermal conductivity of the battery cell of a uniform dielectric material;

[0146] S represents the cross-sectional area of ​​the battery cell.

[0147] In an optional embodiment, the battery cell is an aluminum shell cylindrical;

[0148] The cross-sectional area of ​​the battery cell is calculated using the following formula (2):

[0149] S=πr 2 (2)

[0150] Wherein, S represents the cross-sectional area of ​​the battery cell;

[0151] π represents pi;

[0152] r represents the radius of the circular cross section of the cylinder.

[0153] In an optional embodiment, the battery cell is a square aluminum shell;

[0154] The cross-sectional area of ​​the battery cell is calculated using the following formula (3):

[0155] S=LW (3)

[0156] Wherein, S represents the cross-sectional area of ​​the battery cell;

[0157] L represents the length of the square cross section of the battery;

[0158] W represents the width of the square cross section of the battery.

[0159] In an optional embodiment, the battery cell is a square soft pack;

[0160] The cross-sectional area of ​​the battery cell is calculated using the following formula (4):

[0161] S=LH (4)

[0162] Wherein, S represents the cross-sectional area of ​​the battery cell;

[0163] L represents the length of the square cross section of the battery;

[0164] W represents the thickness of the square cross section of the battery.

[0165] In an optional implementation, collecting a first temperature at a first position on an outer surface of a battery cell of the battery includes one of the following:

[0166] The battery cell is an aluminum cylindrical shell, and the first temperature is collected by a negative temperature coefficient thermistor installed on the top of the pole along the central axis of the cylinder;

[0167] The battery cell is a square aluminum shell, and the first temperature is collected by a negative temperature coefficient thermistor installed on the top of the pole along the central axis of the square;

[0168] The battery is a square soft pack, and the first temperature is collected by a negative temperature coefficient thermistor installed on the top of the pole along a direction parallel to the central axis.

[0169] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0170] The battery temperature detection device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0171] The embodiment of the present invention also provides a computer device having the above Figure 7 The battery temperature detection device shown.

[0172] See also Figure 8 , Figure 8 is a schematic diagram of the structure of a computer device provided by an optional embodiment of the present invention, such as Figure 8 As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 8 A processor 10 is taken as an example.

[0173] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0174] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0175] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0176] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0177] The computer device further comprises a communication interface 30 for the computer device to communicate with other devices or a communication network.

[0178] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0179] A part of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the existence of the computer program instruction in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc., and accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium accessible to the computer.

[0180] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery temperature detection method, characterized in that: The method comprises: Collecting a first temperature at a first position on an outer surface of a battery cell of the battery; Obtaining a conduction distance from a first position on the outer surface of a battery cell of the battery to a second position inside the battery; A second temperature at the second location is calculated based on the first temperature and the conduction distance.

2. The method according to claim 1, characterized in that The following formula (1) is used to calculate the second temperature at the second position based on the first temperature and the conduction distance: Wherein, T(l) represents the temperature of a second position inside the battery of uniform dielectric material; T0 represents a first temperature at a first position on the outer surface of the battery cell of the battery; I represents the current passing through the battery cell of the battery; R represents the internal resistance of the battery cell; l represents the conduction distance from a first position on the outer surface of the battery cell to a second position inside the battery; λ represents the thermal conductivity of the battery cell of a uniform dielectric material; S represents the cross-sectional area of ​​the battery cell.

3. The method according to claim 2, characterized in that The battery cell is an aluminum cylindrical shell; The cross-sectional area of ​​the battery cell is calculated using the following formula (2): S＝πr 2 (2)； Wherein, S represents the cross-sectional area of ​​the battery cell; π represents pi; r represents the radius of the circular cross section of the cylinder.

4. The method according to claim 2, characterized in that: The battery cell is a square aluminum shell; The cross-sectional area of ​​the battery cell is calculated using the following formula (3): S = LW (3); Wherein, S represents the cross-sectional area of ​​the battery cell; L represents the length of the square cross section of the battery; W represents the width of the square cross section of the battery.

5. The method according to claim 2, characterized in that: The battery cell is a square soft pack; The cross-sectional area of ​​the battery cell is calculated using the following formula (4): S = LH (4); Wherein, S represents the cross-sectional area of ​​the battery cell; L represents the length of the square cross section of the battery; W represents the thickness of the square cross section of the battery.

6. The method according to claim 1, characterized in that The collecting of the first temperature at the first position of the outer surface of the battery cell of the battery comprises one of the following: The battery cell is an aluminum cylindrical cell, and the first temperature is collected by a negative temperature coefficient thermistor installed on the top of the pole along the central axis of the cylinder; The battery cell is a square aluminum shell, and the first temperature is collected by a negative temperature coefficient thermistor installed on the top of the pole along the central axis of the square; The battery is a square soft pack, and the first temperature is collected by a negative temperature coefficient thermistor installed on the top of the pole along a direction parallel to the central axis.

7. A battery temperature detection device, characterized in that: The device comprises: A collection module, used for collecting a first temperature at a first position on an outer surface of a battery cell of the battery; An acquisition module, used to acquire a conduction distance from a first position on the outer surface of a battery cell of the battery to a second position inside the battery; A calculation module is used to calculate a second temperature at the second position based on the first temperature and the conduction distance.

8. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the battery temperature detection method according to any one of claims 1 to 6 by executing the computer instructions.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the battery temperature detection method according to any one of claims 1 to 6.

10. A computer program product, characterized in that The method comprises computer instructions, wherein the computer instructions are used to cause a computer to execute the battery temperature detection method according to any one of claims 1 to 6.

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