Battery recycling evaluation method, electronic device and medium

Abstract

This invention provides a battery recycling evaluation method, electronic device, and medium. The method includes: S1, acquiring battery temperature data and battery compression pressure data, calculating the battery temperature rise rate, and screening for the maximum compression pressure of the battery; S2, activating a battery isolation device if the battery temperature rise rate exceeds a first threshold and the maximum compression pressure of the battery reaches a second threshold; S3, acquiring the location of the thermal runaway battery and obtaining a distance dataset between the thermal runaway battery and healthy batteries; S4, calculating a battery health score based on the battery temperature data, battery compression pressure data, and the distance dataset between the thermal runaway battery and healthy batteries, and determining whether the battery is recyclable based on the battery health score. This invention can solve the technical problem in the prior art where, in some battery packs that have experienced thermal runaway, a large number of unaffected and usable batteries remain unrecyclable due to the inability to evaluate many of these batteries, leading to resource waste.

Description

Technical Field

[0001] This invention relates to the field of battery equipment technology, specifically to a battery recycling evaluation method, electronic equipment, and medium. Background Technology

[0002] With the widespread application of electric vehicles and energy storage systems, lithium-ion batteries have become the preferred energy storage device due to their high energy density and long cycle life. However, under conditions such as overcharging, over-discharging, short circuits, or other abnormalities, the internal temperature of lithium-ion batteries may rise sharply, potentially triggering thermal runaway within the battery pack. When the thermal runaway of a single battery in the pack reaches a severe level, it may further spread, leading to thermal runaway of other batteries in the pack, forming a chain reaction and seriously affecting the safety of the battery system.

[0003] To ensure that thermal runaway of batteries is suppressed, many lithium battery thermal runaway propagation suppression technologies have emerged on the market, which have greatly suppressed the spread of thermal runaway. As a result, in some battery packs that have experienced thermal runaway, there are still a large number of unaffected and usable batteries. However, because many of these batteries cannot be evaluated, they cannot be recycled, resulting in resource waste and environmental impact.

[0004] In view of this, the inventors have invented a battery recycling evaluation method, electronic device, and medium. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention proposes a battery recycling evaluation method to solve the technical problem in existing technologies where, after thermal runaway, a large number of unaffected and usable batteries remain in the battery pack, but because many of these batteries cannot be evaluated, they cannot be recycled, leading to resource waste.

[0006] The technical solution adopted by this invention is as follows: Firstly, this invention provides a battery recycling evaluation method, comprising: S1, acquiring battery temperature data and battery compression pressure data, calculating the battery temperature rise rate and screening the maximum compression pressure of the battery; S2, if the battery temperature rise rate is greater than a first threshold and the maximum compression pressure of the battery reaches a second threshold, activating a battery isolation device; S3, acquiring the location of the thermal runaway battery and obtaining a distance dataset between the thermal runaway battery and healthy batteries; S4, calculating a battery health score based on the battery temperature data, battery compression pressure data, and the distance dataset between the thermal runaway battery and healthy batteries, and determining whether the battery is recyclable based on the battery health score.

[0007] Furthermore, acquiring battery temperature data and battery compression pressure data, calculating the battery temperature rise rate, and screening for the maximum compression pressure of the battery includes:

[0008] S11. Obtain battery temperature data and battery extrusion pressure data to obtain battery temperature matrix and battery extrusion pressure matrix;

[0009] S12. Calculate the battery temperature rise rate using the battery temperature rise rate calculation formula to obtain the battery temperature rise rate;

[0010] S13. Based on the battery extrusion pressure matrix, filter the maximum extrusion pressure of the battery.

[0011] Furthermore, the battery temperature rise rate is calculated using the battery temperature rise rate calculation formula, and the specific formula for calculating the battery temperature rise rate is as follows:

[0012]

[0013] in, It is the average rate of change of temperature per unit time, where t is the unit time, T xy，i T represents the current temperature of the battery per unit time. xy,i-1 This represents the battery temperature value for the previous unit event.

[0014] Furthermore, based on battery temperature data, battery crush pressure data, and the distance dataset between thermally runaway batteries and healthy batteries, a battery health score is calculated. The battery health score is then used to determine whether the battery is recyclable. The specific formula for calculating the battery health score is as follows:

[0015] H = wT·f T (T)+wF·f F (F)+wd·f d (d)

[0016] Where wT, wF, and wd are the weights of temperature, extrusion pressure, and influence distance, respectively, and f T (T), f T f F (F), f d (d) are the normalized functions for temperature, extrusion pressure, and influence distance, respectively.

[0017] Furthermore, in the formula for calculating the battery health score, f T (T) is the temperature normalization function, and the specific formula is as follows:

[0018]

[0019] Among them, T xy,i T represents the current battery temperature within the battery pack. f T represents the initial temperature of the battery. xy,max This is the highest temperature of the batteries inside the battery pack.

[0020] Furthermore, in the formula for calculating the battery health score, f F (F) is the normalization function for the battery pack compression force, and the specific formula is as follows:

[0021]

[0022] Among them, F y,i F represents the current compressive force on the battery pack within the battery module. f F represents the preload force of the battery pack. y,max This is the maximum pressure the battery can withstand.

[0023] Furthermore, in the formula for calculating the battery health score, f d (d) is the normalization function for the influence of battery distance, and the specific formula is as follows:

[0024]

[0025] Where x TR ,y TR The x and y coordinates of the thermal runaway battery are respectively, k x ,k y These are the horizontal and vertical influencing factors, respectively.

[0026] In a second aspect, the present invention provides an electronic device including a processor and a memory communicatively connected to the processor and used to store executable instructions of the processor, the processor being used to execute the battery recycling evaluation method described in the first aspect.

[0027] Thirdly, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the battery recycling evaluation method described in the first aspect.

[0028] As can be seen from the above technical solution, the beneficial technical effects of the present invention are as follows:

[0029] This invention provides a battery recycling evaluation method, electronic device, and medium. The battery recycling evaluation method determines whether a battery is in a thermal runaway state by acquiring battery temperature data and battery pressure data. When the battery temperature data and battery pressure data reach a first threshold and a second threshold respectively, the battery is determined to be in a thermal runaway state, and a battery isolation device is activated to isolate the thermally runaway battery. This obtains the location of the thermally runaway battery and the distance dataset between the thermally runaway battery and healthy batteries. Based on the battery temperature data, battery pressure data, and the distance dataset between the thermally runaway battery and healthy batteries, a battery health score is calculated to determine whether the battery is recyclable. This solves the technical problem in the prior art where, in some battery packs that have experienced thermal runaway, a large number of unaffected and usable batteries cannot be recycled because many of these batteries cannot be evaluated, leading to resource waste. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0031] Figure 1 This is a schematic diagram of the overall process of a battery recycling evaluation method according to Embodiment 1 of the present invention;

[0032] Figure 2 This is a schematic diagram illustrating the specific steps for calculating the battery temperature rise rate and screening the maximum squeezing force of batteries, as provided in Embodiment 1 of the present invention, a battery recycling evaluation method. Detailed Implementation

[0033] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0034] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by those skilled in the art to which this invention pertains.

[0035] To address the technical problem in existing technologies where, after thermal runaway, a large number of usable batteries remain unaffected within the battery pack, but are not recyclable due to the inability to assess their value, leading to resource waste, [further solutions are needed]. Figure 1 As shown, this embodiment preferably provides a battery recycling evaluation method, including:

[0036] S1. Obtain battery temperature data and battery compression force data, calculate the battery temperature rise rate and filter the maximum battery compression force. Specifically, in this embodiment, the preferred method is as follows: Figure 2 Shown, including:

[0037] S11. Obtain battery temperature data and battery pressure data to obtain battery temperature matrix and battery pressure matrix. The battery temperature data and battery pressure data are obtained through the battery temperature sensor and battery pressure sensor built into the battery. In this embodiment, the battery temperature sensor and battery pressure sensor are respectively installed on the two side walls of the battery pack to monitor the battery temperature and pressure in real time.

[0038] S12. Calculate the battery temperature rise rate using the battery temperature rise rate calculation formula to obtain the battery temperature rise rate. As a preferred embodiment, the battery temperature rise rate calculation formula is as follows:

[0039]

[0040] in, It is the average rate of change of temperature per unit time, where t is the unit time, T xy，i T represents the current temperature of the battery per unit time. xy,i-1 This represents the battery temperature value for the previous unit event.

[0041] S13. Based on the battery extrusion pressure matrix, filter the maximum extrusion pressure of the battery.

[0042] S2. If the battery temperature rise rate is greater than the first threshold and the battery maximum compressive force reaches the second threshold, the battery isolation device is activated. It should be noted that the battery isolation device is located between adjacent batteries. When the threshold conditions are met, the battery isolation device will separate the thermally runaway battery from the adjacent healthy battery. In this embodiment, it is preferred to use a solenoid valve switch to activate the battery isolation device or a paraffin melting switch to activate the battery isolation device. When the battery temperature rise rate in the battery pack reaches 1℃ / s and the battery maximum compressive force reaches D, it is determined that the battery has thermally runaway.

[0043] S3. Obtain the location of the thermal runaway battery and obtain the distance dataset between the thermal runaway battery and the healthy battery;

[0044] S4. Calculate the battery health score based on battery temperature data, battery crush force data, and the distance dataset between thermal runaway batteries and healthy batteries. Determine whether the battery is recyclable based on the battery health score. Specifically, the formula for calculating the battery health score is as follows:

[0045] H = wT·f T (T)+wF·f F (F)+wd·f d (d)

[0046] Where wT, wF, and wd are the weights of temperature, extrusion pressure, and influence distance, respectively, and f T (T), f T f F (F), f d (d) are the normalized functions for temperature, extrusion pressure, and influence distance, respectively;

[0047] Among them, f T (T) is the temperature normalization function, as shown in the following equation:

[0048]

[0049] Among them, T xy,i T represents the current battery temperature within the battery pack. f T represents the initial temperature of the battery. xy,max This is the highest temperature of the batteries inside the battery pack.

[0050] Among them, f F (F) is the normalized function of the battery pack extrusion pressure, as shown in the following formula:

[0051]

[0052] Among them, F y,i F represents the current compressive force on the battery pack within the battery module. f F represents the preload force of the battery pack. y,max This represents the maximum pressure the battery can withstand.

[0053] Among them, f d (d) is the normalization function for the influence of battery distance, as shown in the following formula:

[0054]

[0055] Where x TR ,y TR The x and y coordinates of the thermal runaway battery are respectively, k x ,k y These are the horizontal and vertical influencing factors, respectively. Due to the close arrangement of the batteries, when a battery experiences thermal runaway, the generated heat is transferred to surrounding batteries through conduction and radiation. The coefficient k is... x =0.8, k y =0.2, which means that the influence of battery contact heat conduction is much greater than the influence of battery radiation heat transfer. In this embodiment, the horizontal and vertical directions of the battery are the arrangement directions of the thermal runaway battery and other batteries. The arrangement direction inside the battery pack can be multiple batteries arranged vertically or horizontally, or both. There is no restriction here. The specific parameters are based on the actual battery pack arrangement.

[0056] Furthermore, in this preferred embodiment, the battery health rating is determined as follows: the rating is divided into three levels: when H is calculated to be 0-0.8, it is an unusable battery; when H is calculated to be 0.8-0.95, it is a recyclable battery; and when H is calculated to be 0.95-1.0, it is a normal battery. A display screen is installed on the outside of the battery pack to display the battery health rating.

[0057] This embodiment provides a battery recycling evaluation method, electronic device, server, and medium. The battery recycling evaluation method determines whether the battery is in a thermal runaway state by acquiring battery temperature data and battery pressure data. When the battery temperature data and battery pressure data reach a first threshold and a second threshold respectively, the battery is determined to be in a thermal runaway state, and a battery isolation device is activated to isolate the thermally runaway battery. This obtains the location of the thermally runaway battery and the distance dataset between the thermally runaway battery and healthy batteries. Based on the battery temperature data, battery pressure data, and the distance dataset between the thermally runaway battery and healthy batteries, a battery health score is calculated to determine whether the battery is recyclable. This solves the technical problem in the prior art where, in some battery packs that have experienced thermal runaway, a large number of unaffected and usable batteries cannot be recycled because many of these batteries cannot be evaluated, leading to resource waste.

[0058] This embodiment also provides an electronic device, including a processor and a memory communicatively connected to the processor and used to store executable instructions of the processor, wherein the processor is used to execute the above-described battery recycling evaluation method.

[0059] The present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the above-described battery recycling evaluation method.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A method for evaluating battery recycling, characterized in that, include: S1. Obtain battery temperature data and battery compression force data, calculate battery temperature rise rate and screen battery maximum compression force; S2. If the battery temperature rise rate is greater than the first threshold and the battery maximum compression force reaches the second threshold, the battery isolation device is activated. S3. Obtain the location of the thermal runaway battery and obtain the distance dataset between the thermal runaway battery and the healthy battery; S4. Calculate the battery health score based on battery temperature data, battery crushing force data, and the distance dataset between thermal runaway batteries and healthy batteries, and determine whether the battery is recyclable based on the battery health score.

2. The battery recycling evaluation method according to claim 1, characterized in that, Acquiring battery temperature and compression pressure data, calculating the battery temperature rise rate, and screening for the maximum compression pressure of batteries includes: S11. Obtain battery temperature data and battery extrusion pressure data to obtain battery temperature matrix and battery extrusion pressure matrix; S12. Calculate the battery temperature rise rate using the battery temperature rise rate calculation formula to obtain the battery temperature rise rate; S13. Based on the battery extrusion pressure matrix, filter the maximum extrusion pressure of the battery.

3. The battery recycling evaluation method according to claim 2, characterized in that, The battery temperature rise rate is calculated using the battery temperature rise rate calculation formula, which is as follows: in, It is the average rate of change of temperature per unit time, where t is the unit time, T xy，i This represents the battery temperature value per unit time. This represents the battery temperature value for the previous unit event.

4. The battery recycling evaluation method according to claim 1, characterized in that, A battery health score is calculated based on battery temperature data, battery crush pressure data, and a dataset of distances between thermally runaway and healthy batteries. The battery health score is then used to determine whether the battery is recyclable. The specific formula for calculating the battery health score is as follows: in, The weights for temperature, extrusion pressure, and distance influence are respectively. , These are normalized functions for temperature, extrusion pressure, and influence distance, respectively.

5. The battery recycling evaluation method according to claim 4, characterized in that, In the formula for calculating the battery health score, The temperature normalization function is defined by the following formula: in, This refers to the current battery temperature within the battery pack. This is the initial temperature of the battery. This is the highest temperature of the batteries inside the battery pack.

6. The battery recycling evaluation method according to claim 4, characterized in that, In the formula for calculating the battery health score, The normalization function for the battery pack compression force is given by the following formula: in, This represents the current compressive force on the battery pack within the battery module. The magnitude of the battery pack preload force. This is the maximum pressure the battery can withstand.

7. The battery recycling evaluation method according to claim 4, characterized in that, In the formula for calculating the battery health score, The normalization function for the effect of battery distance is as follows: in The x and y axes represent the thermal runaway battery, respectively. , These are the horizontal and vertical influencing factors, respectively.

8. An electronic device comprising a processor and a memory communicatively connected to the processor and used for storing processor-executable instructions, characterized in that, The processor is used to execute the battery recycling evaluation method according to any one of claims 1-7.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the battery recycling evaluation method according to any one of claims 1-7.

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