Battery discharge device and battery discharge method using same

Abstract

Provided are a battery discharge device and a battery discharge method using same to define a current energy state of a battery using the Nernst equation, and lower the current energy state of the battery to an optimal range facilitating crushing, thereby enabling safer and more rapid battery crushing. A battery discharge device according to one aspect of the present invention comprises: a battery state determination unit configured to determine an energy state of a battery based on the Nernst equation; a battery diagnosis unit configured to diagnose whether the battery is in a crushable energy state according to the determined energy state of the battery; and a battery energy adjustment unit configured to adjust energy of the battery according to a diagnosis result of whether the battery is in the crushable energy state.

Description

Battery discharge device and battery discharge method using the same

[0001] The present invention relates to a battery discharge device and a battery discharge method using the same, and more particularly, to a battery discharge device capable of lowering the energy state of a battery to an optimal range so as to facilitate crushing of the battery, and to a battery discharge method using the same, capable of crushing the battery in an optimal state.

[0002] The recent declaration of carbon neutrality in Korea and the domestic electric vehicle distribution policy have led to an increase in the use of large-capacity lithium-ion batteries. These batteries are widely used in electric and hybrid vehicles, which require large electrical capacities. Electric vehicles are receiving significant attention as a means to address climate change through carbon neutrality. However, the use of these numerous batteries is expected to lead to a rapid increase in the amount of waste batteries generated from electric vehicles.

[0003] Meanwhile, if the used vehicle batteries that were recovered after being used in eco-friendly vehicles are immediately disposed of (e.g., through resource recovery, etc.), enormous annual disposal costs will be incurred starting in 2024, and the disposal costs are expected to increase explosively after 2031. To partially solve this problem, the used vehicle batteries mentioned above must be recycled for other applications, but since safety cannot be guaranteed due to the energy remaining inside the used battery, i.e., the pre-charged electricity, there is a risk of fire or explosion at any time, so recycling the used vehicle batteries as they are without any guarantees is very dangerous both technically and socially.

[0004] Therefore, in order to recycle / reuse waste batteries, it is necessary to reduce the remaining energy in the waste batteries, i.e. the pre-charged power, to a certain standard.

[0005] The present invention has been devised to solve the above-mentioned problem, and relates to a battery discharging device and a battery discharging method using the same, which can perform safer and faster battery dismantling by defining the current energy state of a battery using the Nernst Equation and lowering the current energy state of the battery to an optimal range that is easy to dismantle.

[0006] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0007] A battery discharge device according to one aspect of the present invention includes a battery state judgment unit configured to judge an energy state of a battery based on the Nernst Equation, a battery diagnosis unit configured to diagnose whether the battery is in a crushable energy state based on the judged energy state of the battery, and a battery energy control unit configured to control the energy of the battery based on a diagnosis result of whether the battery is in a crushable energy state.

[0008] Preferably, the battery status determination unit may include a temperature measurement unit configured to measure the temperature of the battery, a SOC measurement unit configured to measure the SOC of the battery, and a battery energy status determination unit configured to construct a Nernst equation using the measured temperature value and SOC value of the battery and determine the energy status of the battery based on the Nernst equation.

[0009] Preferably, the battery diagnostic unit may be configured to compare the current energy state of the battery with a preset battery crushable energy state based on the Nernst equation when diagnosing whether the battery is in a crushable energy state.

[0010] Preferably, the battery energy control unit may include a first control unit configured to control the energy of the battery by lowering the temperature of the battery according to a diagnosis result of whether the battery is in a crushable energy state, a second control unit configured to control the energy of the battery by lowering the SOC of the battery according to a diagnosis result of whether the battery is in a crushable energy state, and a third control unit configured to control the energy of the battery by lowering both the temperature and the SOC of the battery according to a diagnosis result of whether the battery is in a crushable energy state.

[0011] Preferably, the battery diagnosis unit includes a risk determination unit configured to determine the risk of the energy state of the battery by comparing the preset battery crushable energy state with the current energy state of the battery when diagnosing whether the battery is in a crushable energy state, and the battery energy control unit may be configured to control any one of the first control unit, the second control unit, and the third control unit according to the determined risk of the battery.

[0012] Preferably, the battery energy control unit may be configured to control any one of the first control unit, the second control unit, and the third control unit so that the energy of the battery is lowered through the shortest path from an area where the current energy state of the battery, determined based on the Nernst equation, is located to the preset battery crushable energy state when viewed on a coordinate plane having the temperature value and the SOC value of the battery as variables.

[0013] A battery discharge method according to one aspect of the present invention includes a step of determining an energy state of a battery based on the Nernst equation, a step of diagnosing whether the battery is in a crushable energy state based on the determined energy state of the battery, and a step of adjusting the energy of the battery based on the diagnosis result of whether the battery is in a crushable energy state.

[0014] According to an embodiment of the present invention, the current energy state of a battery can be accurately determined using the Nernst equation, and based on this, the battery's energy can be adjusted to lower the current energy state to an optimal range suitable for destruction. This allows for safer and faster battery destruction.

[0015] In addition, various additional effects can be achieved through various embodiments of the present invention. These various effects of the present invention will be described in detail in each embodiment, or descriptions of effects easily understandable to those skilled in the art will be omitted.

[0016] The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0017] FIG. 1 is a drawing showing a battery discharge device according to one embodiment of the present invention.

[0018] FIG. 2 is a drawing exemplarily showing how the battery energy control unit of the battery discharge device of FIG. 1 controls the energy of the battery.

[0019] Figure 3 is a flowchart illustrating a battery discharge method according to one embodiment of the present invention.

[0020] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided solely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the present invention, and the present invention is defined solely by the scope of the claims.

[0021] The terminology used herein is for the purpose of describing embodiments and is not intended to limit the present invention. In this specification, singular forms also include plural forms, unless specifically stated otherwise. As used herein, the terms "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components in addition to the components mentioned.

[0022] Throughout the specification, the same reference numerals refer to the same elements, and the term "and / or" includes each and every combination of the elements mentioned. Although terms such as "first," "second," etc. are used to describe various elements, these elements are not limited by these terms. These terms are used only to distinguish one element from another. Therefore, it should be understood that a first element mentioned below may also be a second element within the technical scope of the present invention.

[0023] Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used in their common sense to those skilled in the art to which the present invention pertains. Furthermore, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise.

[0024] Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, and it should be understood that there may be various equivalents and modified examples that can replace them at the time of this application.

[0025] In describing the present invention, a "battery" may be a capacitor or secondary battery that stores power by charging. Furthermore, the battery may include at least one of a battery pack comprising a plurality of battery modules, at least one battery module within the battery pack, a battery module comprising a plurality of battery cells, at least one battery cell within the battery module, a representative module representing a plurality of battery modules, and a representative cell representing a plurality of battery cells.

[0026] FIG. 1 is a drawing showing a battery discharge device (10) according to one embodiment of the present invention, and FIG. 2 is a drawing showing an example of a battery energy control unit (300) of the battery discharge device (10) of FIG. 1 controlling the energy of a battery.

[0027] Referring to FIGS. 1 and 2, a battery discharge device (10) according to one embodiment of the present invention may include a battery status determination unit (100), a battery diagnosis unit (200), and a battery energy control unit (300).

[0028] The above battery status determination unit (100) may be configured to determine the energy status of a battery (not shown) based on the Nernst Equation.

[0029] For example, the Nernst equation can be defined as in mathematical equation 1 below.

[0030] [Mathematical Formula 1]

[0031] E=E˚+(RT / nF)x(ln f(SOC))

[0032] In the above mathematical expression 1, E is the energy of the battery defined by the Nernst equation, E˚ is the standard electrode potential, R is the gas constant, T is the absolute temperature (K) of the battery, n is the number of electrons participating in the oxidation-reduction reaction, F is the Faraday constant, and SOC (state of charge) may be the remaining capacity of the battery.

[0033] Specifically, the Nernst equation can be expressed as E=E˚-(RT / nF)(lnQ), and in the reaction aA+bB ↔ cC + dD, the reaction quotient (Q) is =([C] c [D] d ) / ([A] a [B] b ) can be expressed as. It is also applied to the oxidation / reduction reaction of the battery, and in order to calculate the electromotive force of the battery, it can be expressed as the following equation depending on the concentration of the reactants and products.

[0034] E = E°-(RT / nF) ln([Red] / [Ox])

[0035] E = E°+(RT / nF) ln([Ox] / [Red])

[0036] Therefore, when discharging, the equation including the SOC of the battery can be derived as E=E˚+(RT / nF)x(ln f(SOC)).

[0037] For example, the SOC can be estimated using a voltage measurement method. In this method, considering that battery current and temperature affect battery voltage, SOC can be estimated using battery voltage, current, and temperature as factors. However, the SOC estimation method is not limited to this method, and various other methods, such as current integration methods, may also be used.

[0038] Additionally, in order to lower the energy (E) of the battery, there are two ways to lower the temperature (T) or the voltage (f(SOC)) of the battery, among the factors specified in the Nernst equation.

[0039] Referring to FIG. 2, for example, on a coordinate plane having the temperature value and SOC value of the battery as variables, a preset battery crushable energy state determined based on the Nernst equation described above and the current energy state of the battery for the preset battery crushable energy state can be displayed.

[0040] The above battery diagnostic unit (200) can diagnose whether the battery is in a crushable energy state based on the determined energy state of the battery.

[0041] That is, the battery diagnostic unit (200) can diagnose whether the current battery has an energy state that can be crushed without risk of explosion or fire.

[0042] As an example, the battery status determination unit (100) and the battery diagnosis unit (200) may include a processor, and the processor may be implemented as an array of logic gates, a microprocessor, a CPU, a GPU, an AP, or a combination thereof.

[0043] The above battery energy control unit (300) can control the energy of the battery based on the diagnosis result of whether the battery is in a crushable energy state.

[0044] That is, the battery energy control unit (300) may not control the battery energy if the current battery energy level is such that it can be crushed without risk of explosion or fire. As an example, the battery energy control by the battery energy control unit (300) may lower the battery temperature or discharge the battery.

[0045] On the other hand, the battery energy control unit (300) can control the battery energy if the current battery is not in a state where it can be crushed without risk of explosion or fire. This will be discussed in more detail in the related description below.

[0046] According to this embodiment of the present invention, the current energy state of the battery can be accurately determined using the Nernst Equation, and based on this, the battery's energy can be adjusted to lower the current energy state to an optimal range suitable for destruction. This allows for safer and faster battery destruction.

[0047] Specifically, the battery status determination unit (100) may include a temperature measurement unit (110), a SOC measurement unit (120), and a battery energy status determination unit (130).

[0048] The above temperature measuring unit (110) can measure the temperature of the battery.

[0049] The above SOC measurement unit (120) can measure the SOC of the battery.

[0050] The above battery energy status determination unit (130) can construct the Nernst equation using the measured temperature value and SOC value of the battery. In addition, the battery energy status determination unit (130) can determine the energy status of the battery based on the Nernst equation.

[0051] Referring to FIG. 2, for example, on a coordinate plane having the temperature value and SOC value of the battery as variables, a preset battery crushable energy state determined based on the Nernst equation described above and a current energy state of the battery for the preset battery crushable energy state can be displayed.

[0052] At this time, the current energy state of the battery, determined based on the Nernst equation, can be expressed using the measured temperature value and SOC value of the battery.

[0053] In one embodiment, the battery diagnostic unit (200) may compare the current energy state of the battery with a preset battery energy state based on the Nernst equation when diagnosing whether the battery is in a destructible energy state. In this case, the battery being in a destructible energy state may mean that the battery is in an energy state that can be destructed without risk of explosion or fire.

[0054] That is, the battery diagnostic unit (200) can diagnose whether the current battery is in an energy state that can be crushed without risk of explosion or fire or not by comparing the current energy state of the battery with the preset energy state of the battery that can be crushed based on the Nernst equation.

[0055] In one embodiment, the battery energy control unit (300) may include a first control unit (310), a second control unit (320), and a third control unit (330).

[0056] The first control unit (310) can lower the temperature of the battery to control the energy of the battery, based on the diagnosis result of whether the battery is in a crushable energy state by the battery diagnosis unit (200). For example, as shown in FIG. 2, battery number 1 is currently in a 300 V state, and can be diagnosed as being in a non-crushed state by the battery diagnosis unit (200) when viewed on a coordinate plane having the temperature value and the SOC value of the battery as variables. At this time, the first control unit (310) can lower the energy state of the battery by lowering the temperature of the battery to 150 K or less. Accordingly, the battery can be in a preset crushable energy state when viewed on a coordinate plane having the temperature value and the SOC value of the battery as variables.

[0057] The second control unit (320) can lower the SOC of the battery to control the energy of the battery according to the diagnosis result of whether the battery is in a crushable energy state by the battery diagnosis unit (200). For example, as shown in FIG. 2, battery number 2 is currently in a 150 V state, and can be diagnosed as being in a non-crushed state by the battery diagnosis unit (200) when viewed on a coordinate plane having the temperature value and the SOC value of the battery as variables. At this time, the second control unit (320) can discharge the battery to lower the potential (SOC) of the battery to 50 V or less. Accordingly, the battery can be in a preset crushable energy state when viewed on a coordinate plane having the temperature value and the SOC value of the battery as variables.

[0058] The third control unit (330) can control the energy of the battery to lower the temperature of the battery and the SOC at the same time, based on the diagnosis result of whether the battery is in a crushable energy state by the battery diagnosis unit (200). For example, as shown in FIG. 2, battery number 3 is currently in a 400 V state, and can be diagnosed as being in a non-crushed state by the battery diagnosis unit (200) when viewed on a coordinate plane that has the temperature value and the SOC value of the battery as variables. At this time, the third control unit (330) can discharge the battery so that the potential (SOC) of the battery becomes 100 V or less and lower the temperature of the battery to 250 K or less. Accordingly, the battery can be in a preset crushable energy state when viewed on a coordinate plane that has the temperature value and the SOC value of the battery as variables. For example, when viewed on a coordinate plane with the temperature value and SOC value of the battery as variables, the energy control of the battery by the third control unit (330) that lowers the temperature and SOC of the battery simultaneously can be performed in a diagonal direction as shown in FIG. 2.

[0059] According to this implementation configuration, the current energy state of the battery (the position of the battery on a coordinate plane with the temperature value and SOC value of the battery as variables) determined using the Nernst equation can be lowered by discharging the battery to lower the temperature of the battery, lowering the SOC of the battery, or lowering the temperature and SOC of the battery simultaneously to lower the current energy state of the battery to an optimal range that is easy to destroy.

[0060] In one embodiment, the battery diagnostic unit (200) may include a risk assessment unit (210).

[0061] The above risk assessment unit (210) can compare the preset battery crushable energy state with the current energy state of the battery to determine the risk of the energy state of the battery when diagnosing whether the battery is in a crushable energy state.

[0062] For example, the risk of a battery's energy state can refer to the degree to which the battery is likely to explode or catch fire. For example, on a coordinate plane with the battery's temperature and SOC values ​​as variables in Figure 2, the risk of the battery's energy state can be represented as "high," "medium," or "low."

[0063] At this time, the battery energy control unit (300) can control any one of the first control unit (310), the second control unit (320), and the third control unit (330) according to the risk of the battery determined by the risk determination unit (210).

[0064] That is, the battery energy control unit (300) can control any one of the first control unit (310), the second control unit (320), and the third control unit (330) so that the risk of the energy state of the battery can be quickly reduced.

[0065] For example, as shown in FIG. 2, battery No. 1 is currently at 300 V, and can be diagnosed as being in a non-crushing state by the battery diagnosis unit (200) when viewed on a coordinate plane with the temperature value and SOC value of the battery as variables. In addition, battery No. 1 can be determined to have a 'high' risk level of the energy state of the battery by the risk determination unit (210). At this time, the first control unit (310) can control the energy of the battery by lowering the temperature of the battery to 150 K or less. In addition, by controlling the energy of the battery by the first control unit (310), battery No. 1 can be in a 'low' risk level of the energy state of the battery, thereby entering a preset battery-crushing energy state.

[0066] Also, as shown in Fig. 2, battery No. 2 is currently at 150 V, and can be diagnosed as being in a non-crushing state by the battery diagnosis unit (200) when viewed on a coordinate plane with the temperature value and SOC value of the battery as variables. In addition, battery No. 2 can be determined to have a 'high' risk level of the energy state of the battery by the risk determination unit (210). At this time, the second control unit (320) can discharge the battery so that the potential (SOC) of the battery becomes 50 V or lower. In addition, due to the discharge by the second control unit (320), battery No. 2 can be in a 'low' risk level of the energy state of the battery, and can thus be in a preset battery-crushing energy state.

[0067] Also, as shown in Fig. 2, battery number 3 is currently at 400 V, and can be diagnosed as an un-crushing state by the battery diagnosis unit (200) when viewed on a coordinate plane with the temperature value and SOC value of the battery as variables. In addition, battery number 3 can be determined to have a 'high' risk level of the energy state of the battery by the risk determination unit (210). At this time, the third control unit (330) can control the energy of the battery by discharging the battery potential (SOC) to 100 V or lower and lowering the temperature of the battery to 250 K or lower. In addition, by controlling the energy of the battery by the third control unit (330), battery number 3 can be set to a 'low' risk level of the energy state of the battery, and thus can be in a preset battery-crushing energy state.

[0068] In one embodiment, the battery energy control unit (300) can control any one of the first control unit (310), the second control unit (320), and the third control unit (330) so that the energy of the battery is lowered through the shortest path from an area where the current energy state of the battery, determined based on the Nernst equation, is located on a coordinate plane having the temperature value and the SOC value of the battery as variables, to a preset battery crushable energy state.

[0069] For example, as shown in FIG. 2, battery No. 1 is currently at 300 V, and can be diagnosed as an unbreakable state by the battery diagnosis unit (200) when viewed on a coordinate plane having the temperature value and SOC value of the battery as variables. In addition, battery No. 1 can be determined to have a high risk of battery energy state by the risk determination unit (210). At this time, the battery energy control unit (300) can control the first control unit (310) so that the energy of the first battery is lowered through the shortest path from an area where the current energy state of the battery, determined based on the Nernst equation, is located on a coordinate plane having the temperature value and SOC value of the battery as variables, to a preset battery breakable energy state. Here, the first control unit (310) can control the energy of the battery by lowering the temperature of the battery to 150 K or less. And, by controlling the energy of the battery by the first control unit (310), the risk level of the battery energy state of battery No. 1 can be set to a 'low' state, thereby reaching a preset battery crushing-capable energy state.

[0070] Also, as shown in FIG. 2, battery No. 2 is currently at 150 V, and can be diagnosed as an unbreakable state by the battery diagnosis unit (200) when viewed on a coordinate plane having the temperature value and SOC value of the battery as variables. In addition, battery No. 2 can be determined to have a high risk of battery energy state by the risk determination unit (210). At this time, the battery energy control unit (300) can control the second control unit (320) to lower the energy of the second battery through the shortest path from the region where the current energy state of the battery, determined based on the Nernst equation, is located to the preset battery breakable energy state when viewed on a coordinate plane having the temperature value and SOC value of the battery as variables. Here, the second control unit (320) can discharge the battery so that the potential (SOC) of the battery becomes 50 V or less. And, by discharging by the second control unit (320), the second battery can be brought into a state where the risk level of the battery's energy state is 'low', thereby reaching a preset battery crushing energy state.

[0071] Also, as shown in FIG. 2, battery number 3 is currently at 400 V, and can be diagnosed as an unbreakable state by the battery diagnosis unit (200) when viewed on a coordinate plane that has the temperature value and SOC value of the battery as variables. In addition, battery number 3 can be determined to have a high risk of energy state by the risk determination unit (210). At this time, the battery energy control unit (300) can control the third control unit (330) so that the energy of the third battery is lowered through the shortest path from the region where the current energy state of the battery, determined based on the Nernst equation, is located to the preset battery breakable energy state when viewed on a coordinate plane that has the temperature value and SOC value of the battery as variables. Here, the third control unit (330) can control the energy of the battery by discharging the battery so that the potential (SOC) of the battery becomes 100 V or less and lowering the temperature of the battery to 250 K or less. And, by controlling the energy of the battery by the third control unit (330), the risk level of the battery energy state of the third battery can be set to a 'low' state, and the battery can be in a preset state of possible battery crushing energy.

[0072] According to this implementation configuration, the battery's energy can be adjusted to decrease through the shortest path to a preset energy state that allows the battery to be crushed, based on the battery's current energy state (the battery's position on a coordinate plane with the battery's temperature and SOC values ​​as variables) determined using the Nernst equation. Accordingly, the current battery's energy state can be more quickly lowered to an optimal range suitable for crushing.

[0073] In addition, according to an embodiment of the present invention, when discharging along the shortest path (e.g., shortening a single discharge time from 4 hours to 2 hours) by the Nernst equation, there is a cost reduction effect from 18.5 million won to 12.5 million won per year per discharge device based on the KEPCO industrial power rate, and the effect of increasing the battery discharge amount by the shortened time can be achieved.

[0074] Figure 3 is a flowchart illustrating a battery discharge method according to one embodiment of the present invention.

[0075] Referring to FIG. 3, a battery discharge method according to one embodiment of the present invention includes the following steps S1 to S3.

[0076] In step S1, the energy status of the battery is determined based on the Nernst equation. At this time, step S1 may be performed by the battery status determination unit (100) described above.

[0077] In step S2, based on the determined energy status of the battery, a diagnosis is made as to whether the battery is in a state where it can be crushed. At this time, step S2 may be performed by the battery diagnosis unit (200) described above.

[0078] In step S3, the battery's energy is adjusted based on the diagnosis result of whether the battery is in a state of energy that can be crushed. At this time, step S3 can be performed by the battery energy adjustment unit (300) described above.

[0079] As described above, although the present invention has been described by limited embodiments and drawings, the present invention is not limited thereto, and various modifications and variations are possible by a person having ordinary skill in the art to which the present invention pertains within the scope of the technical idea of ​​the present invention and the equivalent scope of the patent claims to be described below.

[0080] Meanwhile, although terms indicating directions such as up, down, left, right, front, and back are used in the present invention, it is obvious to those skilled in the art that these terms are only for convenience of explanation and may vary depending on the location of the target object or the location of the observer.

[0081] [Explanation of symbols]

[0082] 10: Battery discharge device

[0083] 100: Battery status judgment unit

[0084] 110: Temperature measurement unit

[0085] 120: SOC measurement unit

[0086] 130: Battery energy status judgment unit

[0087] 200: Battery Diagnostic Section

[0088] 210: Risk Assessment Department

[0089] 300: Battery energy control unit

[0090] 310: First Control Unit

[0091] 320: Second Control Unit

[0092] 330: Third Control Unit

Claims

1. A battery status judgment unit configured to judge the energy status of a battery based on the Nernst Equation; A battery diagnostic unit configured to diagnose whether the battery is in a crushable energy state based on the energy state of the battery determined above; and A battery discharge device characterized by including a battery energy control unit configured to control the energy of the battery based on the diagnosis result of whether the battery is in a crushable energy state.

2. In paragraph 1, The above battery status judgment unit, A temperature measuring unit configured to measure the temperature of the above battery; an SOC measuring unit configured to measure the SOC of the above battery; and A battery discharge device characterized by including a battery energy status determination unit configured to construct a Nernst equation using the temperature value and SOC value of the measured battery and determine the energy status of the battery based on the Nernst equation.

3. In paragraph 2, The above battery diagnostic unit, A battery discharge device characterized in that, when diagnosing whether the battery is in a crushable energy state, it is configured to compare the current energy state of the battery with a preset battery crushable energy state based on the Nernst equation.

4. In paragraph 3, The above battery energy control unit, A first control unit configured to control the energy of the battery by lowering the temperature of the battery according to the diagnosis result of whether the battery is in a crushable energy state; A second control unit configured to control the energy of the battery by lowering the SOC of the battery according to the diagnosis result of whether the battery is in a crushable energy state; and A battery discharge device characterized by including a third control unit configured to simultaneously lower the temperature and SOC of the battery to control the energy of the battery according to the diagnosis result of whether the battery is in a crushable energy state.

5. In paragraph 4, The above battery diagnostic unit, When diagnosing whether the battery is in a crushable energy state, a risk determination unit configured to determine the risk of the energy state of the battery by comparing the preset crushable energy state of the battery with the current energy state of the battery, The above battery energy control unit, A battery discharge device characterized in that it is configured to control one of the first control unit, the second control unit, and the third control unit according to the risk level of the battery determined above.

6. In paragraph 5, The above battery energy control unit, A battery discharge device characterized in that it is configured to control any one of the first control unit, the second control unit, and the third control unit so that the energy of the battery is lowered through the shortest path from the area where the current energy state of the battery is located, as determined based on the Nernst equation, to the preset battery crushable energy state, when viewed on a coordinate plane having the temperature value and the SOC value of the battery as variables.

7. In a battery discharge method performed by a battery discharge device, A step for determining the energy status of a battery based on the Nernst equation; A step of diagnosing whether the battery is in a crushable energy state based on the energy state of the battery determined above; and A battery discharge method, characterized by including a step of adjusting the energy of the battery based on the diagnosis result of whether the battery is in a crushable energy state.

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