Battery recovery evaluation method, electronic equipment and medium

Abstract

The invention provides a battery recovery evaluation method, electronic equipment and a medium, and the method comprises the steps: S1, obtaining battery temperature data and battery extrusion force data, calculating a battery temperature rise rate, and screening the maximum extrusion force of batteries; s2, if the temperature rise rate of the battery is greater than a first threshold value and the maximum extrusion force of the battery reaches a second threshold value, starting a battery isolation device; s3, obtaining the position of the thermal runaway battery, and obtaining a distance data set of the thermal runaway battery and the healthy battery; and S4, calculating a battery health degree score based on the battery temperature data, the battery extrusion force data and the thermal runaway battery and healthy battery distance data set, and judging whether the battery is recyclable or not according to the battery health degree score. According to the method, the technical problem that in the prior art, most batteries which are not influenced and can be utilized exist in part of battery packs subjected to thermal runaway, but many batteries cannot be recovered due to the fact that the batteries cannot be evaluated, and resource waste is caused can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery equipment, and in particular to a battery recycling evaluation method, electronic equipment and medium. Background Art

[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, when lithium-ion batteries are overcharged, over-discharged, short-circuited or in other abnormal conditions, the internal temperature of the lithium battery may rise sharply, which may cause thermal runaway of the batteries in the battery pack. When the thermal runaway of a single battery in the battery pack reaches a serious level, it may spread further and cause thermal runaway of other batteries in the battery pack, forming a chain reaction, which seriously affects the safety of the battery system.

[0003] In order to ensure that the thermal runaway of the battery is suppressed, many lithium battery thermal runaway spread suppression technologies have appeared on the market, which can suppress the spread of thermal runaway of the battery to a great extent. Therefore, in some battery packs after thermal runaway has occurred, there are most batteries that are not affected and can be used. However, many of these batteries cannot be evaluated and cannot be recycled, resulting in waste of resources and impact on the environment.

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

[0005] In view of the shortcomings of the prior art, the present invention proposes a battery recycling evaluation method to solve the technical problem in the prior art that after thermal runaway, most of the batteries in the battery pack are not affected and can be used, but many of these batteries cannot be evaluated and cannot be recycled, resulting in a waste of resources.

[0006] The technical solution adopted by the present invention is that, in the first aspect, the present invention provides a battery recycling evaluation method, including: S1, obtaining battery temperature data and battery extrusion pressure data, calculating the battery temperature rise rate and screening the battery maximum extrusion pressure; S2, if the battery temperature rise rate is greater than a first threshold and the battery maximum extrusion pressure reaches a second threshold, starting the battery isolation device; S3, obtaining the position of the thermal runaway battery, and obtaining a data set of the distance between the thermal runaway battery and the healthy battery; S4, calculating the battery health score based on the battery temperature data, the battery extrusion pressure data and the data set of the distance between the thermal runaway battery and the healthy battery, and judging whether the battery is recyclable according to the battery health score.

[0007] Furthermore, obtaining battery temperature data and battery extrusion force data, calculating the battery temperature rise rate and screening the maximum battery extrusion force include:

[0008] S11, acquiring battery temperature data and battery extrusion pressure data to obtain a battery temperature matrix and a battery extrusion pressure matrix;

[0009] S12, calculating the battery temperature rise rate using a battery temperature rise rate calculation formula to obtain the battery temperature rise rate;

[0010] S13. Filter the maximum battery extrusion pressure according to the battery extrusion pressure matrix.

[0011] Furthermore, the battery temperature rise rate calculation formula is used to calculate the battery temperature rise rate, and the battery temperature rise rate is obtained. The battery temperature rise rate calculation formula is as follows:

[0012]

[0013] in, is the average rate of change of temperature per unit time, t is the unit time, T xy，i is the temperature value of the battery per unit time, T xy,i-1 The temperature value of the battery in the previous unit event.

[0014] Furthermore, the battery health score is calculated based on the battery temperature data, battery extrusion force data, and the distance data set between the thermal runaway battery and the healthy battery, and the battery health score is used to determine whether the battery is recyclable. The calculation formula for the battery health score is as follows:

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

[0016] Among them, wT, wF, wd are the weights of temperature, extrusion pressure, and influence distance respectively, and f T (T), f T f F (F), f d (d) Normalized functions of temperature, extrusion pressure, and impact distance, respectively.

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

[0018]

[0019] Among them, T xy,i is the current battery temperature of the battery in the battery pack, T f is the initial temperature of the battery, T xy,max It is the maximum temperature of the battery in the battery pack.

[0020] Furthermore, in the calculation formula of the battery health score, f F (F) is the normalized function of the battery pack extrusion force, and the specific formula is as follows:

[0021]

[0022] Among them, F y,i F is the current squeezing force of the battery pack in the battery pack, f F is the preload force of the battery pack. y,max The maximum pressure that the battery can withstand.

[0023] Furthermore, in the calculation formula of the battery health score, f d (d) is the normalized function of battery distance effect, and the specific formula is as follows:

[0024]

[0025] where x TR ,y TR They are the horizontal and vertical coordinates of the thermal runaway battery, k x ,k y are the influencing factors in the horizontal and vertical directions respectively.

[0026] In a second aspect, the present invention provides an electronic device, comprising a processor and a memory connected to the processor for storing instructions executable by the processor, wherein the processor is used to execute the battery recycling evaluation method described in the first aspect.

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

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

[0029] The present invention provides a battery recycling evaluation method, an electronic device and a medium, wherein in the battery recycling evaluation method, by obtaining the battery temperature data and the battery extrusion pressure data, it is determined whether the battery is in a thermal runaway state. When the battery temperature data and the battery extrusion pressure data reach a first threshold value and a second threshold value respectively, the battery is determined to be in a thermal runaway state, and a battery isolation device is started to isolate the thermal runaway battery, thereby obtaining the location of the thermal runaway battery and a data set of the distance between the thermal runaway battery and a healthy battery at this time. The battery health score is calculated based on the battery temperature data, the battery extrusion pressure data and the data set of the distance between the thermal runaway battery and the healthy battery to calculate the battery health score, and thereby determine whether the battery is recyclable, thereby solving the technical problem in the prior art that after a part of the battery pack has experienced thermal runaway, there are most of the batteries that are not affected and can be used, but many of these batteries cannot be evaluated and cannot be recycled, resulting in a waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. 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 according to the actual scale.

[0031] Figure 1 A schematic diagram of the overall process of a battery recycling evaluation method provided in Example 1 of the present invention;

[0032] Figure 2 A schematic diagram of specific steps for calculating the battery temperature rise rate and screening the maximum extrusion force of the battery provided in a battery recycling evaluation method according to Example 1 of the present invention. DETAILED DESCRIPTION

[0033] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0034] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0035] To solve the technical problem that in the prior art, after thermal runaway occurs in some battery packs, most of the batteries are not affected and can be used, but many of these batteries cannot be evaluated and cannot be recycled, resulting in a waste of resources, such as Figure 1 As shown, this embodiment preferably provides a battery recycling evaluation method, including:

[0036] S1. Obtain battery temperature data and battery extrusion force data, calculate the battery temperature rise rate and screen the maximum battery extrusion force. Specifically, this embodiment is preferred, such as Figure 2 As shown, including:

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

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

[0039]

[0040] in, is the average rate of change of temperature per unit time, t is the unit time, T xy，i is the temperature value of the battery per unit time, T xy,i-1 The temperature value of the battery in the previous unit event.

[0041] S13. Filter the maximum battery extrusion pressure according to the battery extrusion pressure matrix.

[0042] S2. If the battery temperature rise rate is greater than the first threshold and the maximum squeeze pressure of the battery reaches the second threshold, the battery isolation device is started. It should be noted that the battery isolation device is located between adjacent batteries. When the threshold condition is reached, the battery isolation device separates the thermal runaway battery from the adjacent healthy battery. In this embodiment, preferably, the battery isolation device is started by a solenoid valve switch or a paraffin melting switch. When it is detected that the battery temperature rise rate in the battery pack reaches 1°C / s and the maximum squeeze pressure of the battery reaches D, it is determined that the battery has thermal runaway.

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

[0044] S4. Calculate the battery health score based on the battery temperature data, battery extrusion force data, and the distance data set between the thermal runaway battery and the healthy battery, and determine whether the battery is recyclable based on the battery health score. Specifically, the calculation formula for the battery health score is as follows:

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

[0046] Among them, wT, wF, wd are the weights of temperature, extrusion pressure, and influence distance respectively, and f T (T), f T f F (F), f d (d) Normalized functions of temperature, extrusion pressure, and impact distance, respectively;

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

[0048]

[0049] Among them, T xy,i is the current battery temperature of the battery in the battery pack, T f is the initial temperature of the battery, T xy,max The maximum temperature of the battery in the battery pack;

[0050] Among them, f F (F) is the normalized function of the battery pack extrusion force, as shown below:

[0051]

[0052] Among them, F y,i F is the current squeezing force of the battery pack in the battery pack, f F is the preload force of the battery pack. y,max The maximum pressure that the battery can withstand;

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

[0054]

[0055] where x TR ,y TR They are the horizontal and vertical coordinates of the thermal runaway battery, k x ,k y are the influencing factors in the horizontal and vertical directions respectively. Since the batteries are closely arranged, when the battery thermally runs away, the heat generated is transferred to the surrounding batteries by heat conduction and radiation. The coefficient k x =0.8, k y =0.2, that is, considering that the influence of battery contact heat conduction is much greater than the influence of battery radiation heat exchange, in this embodiment, the horizontal and vertical directions of the battery are the arrangement directions of the thermal runaway battery and other batteries, and the arrangement direction inside the battery pack can be a longitudinal arrangement of multiple batteries, or a transverse arrangement, or both, which is not limited here. The specific parameters are based on the actual arrangement of the battery pack inside the battery pack.

[0056] Furthermore, in this embodiment, preferably, the battery health score is determined as follows: the score levels are 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; when H is calculated to be 0.95-1.0, it is a normal battery; a display screen is set outside the battery pack to display the battery health score.

[0057] That is, this embodiment provides a battery recycling evaluation method, electronic device, server and medium, wherein in the battery recycling evaluation method, by obtaining the battery temperature data and the battery extrusion pressure data, it is determined whether the battery is in a thermal runaway state. When the battery temperature data and the battery extrusion pressure data reach a first threshold and a second threshold respectively, the battery is determined to be in a thermal runaway state, and the battery isolation device is started to isolate the thermal runaway battery, so as to obtain the position of the thermal runaway battery and the distance data set between the thermal runaway battery and the healthy battery at this time, and calculate the battery health score based on the battery temperature data, the battery extrusion pressure data and the distance data set between the thermal runaway battery and the healthy battery to calculate the battery health score, and use this to determine whether the battery is recyclable, thereby solving the technical problem in the prior art that after some battery packs have experienced thermal runaway, there are most of the batteries that are not affected and can be used, but many of these batteries cannot be evaluated and cannot be recycled, resulting in waste of resources.

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

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

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A battery recycling evaluation method, characterized in that: include: S1. Obtain battery temperature data and battery extrusion pressure data, calculate battery temperature rise rate and screen battery maximum extrusion pressure; S2. If the battery temperature rise rate is greater than the first threshold and the maximum extrusion pressure of the battery reaches the second threshold, the battery isolation device is activated; S3. Obtain the location of the thermal runaway battery and obtain a distance data set between the thermal runaway battery and the healthy battery; S4. Calculate the battery health score based on the battery temperature data, battery extrusion force data, and the distance data set between the thermal runaway battery and the healthy battery, 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: Obtaining battery temperature data and battery extrusion force data, calculating battery temperature rise rate and screening battery maximum extrusion force include: S11, acquiring battery temperature data and battery extrusion pressure data to obtain a battery temperature matrix and a battery extrusion pressure matrix; S12, calculating the battery temperature rise rate using a battery temperature rise rate calculation formula to obtain the battery temperature rise rate; S13. Filter the maximum battery extrusion pressure according to the battery extrusion pressure matrix.

3. The battery recycling evaluation method according to claim 2, characterized in that: The battery temperature rise rate calculation formula is used to calculate the battery temperature rise rate, and the battery temperature rise rate is obtained. The battery temperature rise rate calculation formula is as follows: in, is the average rate of change of temperature per unit time, t is the unit time, T xy，i is the temperature value of the battery per unit time, T xy,i-1 The temperature value of the battery in the previous unit event.

4. The battery recycling evaluation method according to claim 1, characterized in that: The battery health score is calculated based on the battery temperature data, battery extrusion force data, and the distance data set between the thermal runaway battery and the healthy battery. The battery health score is used to determine whether the battery is recyclable. The calculation formula for the battery health score is as follows: H=wT·f T (T)+wF·f F (F)+wd·f d (d) Among them, wT, wF, wd are the weights of temperature, extrusion pressure, and influence distance respectively, and f T (T), f T f F (F), f d (d) Normalized functions of temperature, extrusion pressure, and impact distance, respectively.

5. The battery recycling evaluation method according to claim 1 according to claim 4, characterized in that: In the calculation formula of the battery health score, f T (T) is the temperature normalization function, the specific formula is as follows: Among them, T xy,i is the current battery temperature of the battery in the battery pack, T f is the initial temperature of the battery, T xy,max It is the maximum temperature of the battery in the battery pack.

6. The battery recycling evaluation method according to claim 1 according to claim 4, characterized in that: In the calculation formula of the battery health score, f F (F) is the normalized function of the battery pack extrusion force, and the specific formula is as follows: Among them, F y,i F is the current squeezing force of the battery pack in the battery pack, f F is the preload force of the battery pack. y,max The maximum pressure that the battery can withstand.

7. The battery recycling evaluation method according to claim 1 according to claim 4, characterized in that: In the calculation formula of the battery health score, f d (d) is the normalized function of battery distance effect, and the specific formula is as follows: where x TR ,y TR They are the horizontal and vertical coordinates of the thermal runaway battery, k x ,k y are the influencing factors in the horizontal and vertical directions respectively.

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

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

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