KR20220029338A - Battery system sensing battery cell damaged and evaluating method for battery module - Google Patents

Abstract

The present invention relates to a battery system capable of detecting damaged battery cells and a battery module evaluation method. The battery system and a battery module evaluation device introduce a plurality of gas sensor units into a battery module in which the plurality of battery cells are accommodated, and can accurately predict the location of a gas-generated battery cell by comparing gas detection time measured by the gas sensor units when gas is generated from the battery cells, thereby being usefully used in terms of the development of the battery module and/or the management of the developed battery module.

Description

BATTERY SYSTEM SENSING BATTERY CELL DAMAGED AND EVALUATING METHOD FOR BATTERY MODULE

The present invention relates to a battery system capable of detecting a damaged battery cell and a battery module evaluation method.

The secondary battery has a structure in which an electrode assembly composed of a positive electrode, a negative electrode, and a separator disposed between them is built-in inside the battery case, and the positive and negative electrode tabs are welded to two electrode tabs and sealed to be exposed to the outside of the battery case. consist of. These electrode tabs are electrically connected to an external device through contact, and the secondary battery supplies power to an external device or receives power from an external device through the electrode tab.

In a secondary battery, when the battery is operated in an abnormal state due to overcharge, overdischarge, overheating, external shock, etc., gas may be generated inside. For example, an overheated battery generates gas inside, and the generated gas is pressurized from the inside of the case to further accelerate the decomposition reaction of each battery element inserted into the case and cause continuous overheating and gas generation, Accordingly, a swelling phenomenon may occur. This phenomenon also appears in the process of gradually deteriorating the secondary battery due to long-term use. Accordingly, in order to develop a battery cell with uniform charge/discharge characteristics, information on the pressure change due to a change in the volume of the battery cell according to the use of the battery cell for a long time or charge and discharge is required, and the lifespan and efficiency when the developed battery cell is used A technology capable of monitoring volume changes or pressure changes in real time is required in order to improve the

1 is a diagram illustrating a system for detecting characteristics of a battery module in which a battery cell is conventionally mounted. Referring to FIG. 1 , the system 10 stores the battery module 12 in which n battery cells are accommodated in the chamber 11 , and then uses the charge/discharge unit 18 to store the battery cells in the battery module 12 . Swelling is induced by performing repeated charging and discharging of 12) was recovered and then directly disassembled and inspected.

However, the system 10 cannot remotely detect whether swelling of the battery cells accommodated in the battery module has occurred, and the inspection method of disassembling the battery module after recovery is cumbersome and takes a lot of time.

Japanese Laid-Open Patent Publication No. 2012-110129

Accordingly, it is an object of the present invention to provide a system and method capable of acquiring information on a pressure change according to a volume change of a battery cell according to the use or charging/discharging of a battery cell mounted in a battery module for a long time.

In order to solve the above-mentioned problem,

The present invention in one embodiment,

In the battery system comprising a battery module, and a battery management system (BMS) for controlling the operation and state of the battery module,

The battery module includes a plurality of battery cells, a module case in which the battery cells are accommodated, and a plurality of spaced apart from each other on the inner surface of the module case to detect gas generated from the battery cells during charging and discharging, and measuring a gas detection time of the gas sensor unit;

The battery management system (BMS) is electrically connected to a gas sensor unit to receive information measured from each gas sensor unit, and provides a battery system that calculates the location of a cell generating gas from the transmitted information.

Here, the gas sensor unit may further measure at least one selected from the group consisting of a gas type and a gas concentration value.

In addition, the battery management system (BMS) may receive measurement values from a plurality of gas sensor units spaced apart from each other and compare the received measurement values to calculate the location of a cell in which gas is generated, and the gas sensor When the value measured in the unit reaches a preset value, the user may be notified of damage to the battery cell.

In addition, the module case may include a plurality of gas discharge units, and a gas sensor unit may be individually disposed adjacent to each gas discharge unit.

Specifically, the gas discharge unit may include a first gas discharge unit located on a first side surface of the module case and a second gas discharge unit located on a second side surface opposite to the first side surface.

In addition, the battery system may further include an insulation resistance sensor located on the inner surface of the module case to measure the insulation resistance of the battery module and transmit the measured value to the battery management system (BMS).

In addition, the battery system may be a vehicle battery pack or an energy storage system (ESS).

In addition, the present invention in one embodiment,

chamber;

a temperature controller positioned inside the chamber to control the internal temperature of the chamber to an average of 60 to 100°C;

A module case stored in the chamber and accommodating a plurality of battery cells, and a plurality of gas sensor units that are spaced apart from each other on the inner surface of the module case, detect gas generated inside the module case, and measure the gas detection time a battery module provided with;

It is electrically connected to the plurality of gas sensor units to receive the gas detection time measured from each gas sensor unit, and compares the gas detection time received from each gas sensor unit to detect a damaged battery cell among the plurality of battery cells. It provides an apparatus for evaluating the performance of a battery module including; a data processing unit to predict.

In this case, the battery module may have a structure in which a first gas discharge unit and a second gas discharge unit are formed on the side of the module case, and a first gas sensor unit and a second gas sensor unit are formed in the first gas discharge unit and the second gas discharge unit. It may be a structure in which each part is disposed.

Specifically, the first gas discharge unit may have a structure formed on a first side surface of the battery module, and the second gas discharge unit may have a structure formed on a second side surface opposite to the first side surface.

In addition, it may further include an insulation resistance sensor located on the inner surface of the module case, electrically connected to the data processing unit, measuring the insulation resistance of the battery module and transmitting the measured insulation resistance value to the data processing unit.

Furthermore, the present invention in one embodiment,

In the performance evaluation method of a battery module using the performance evaluation device according to the present invention described above,

Mounting a battery module in which a plurality of battery cells are accommodated in the module case in a chamber;

generating gas inside the battery module by adjusting the internal temperature of the chamber in which the battery module is mounted to 60 to 100°C;

measuring the gas detection time by detecting gas generated inside the battery module with a plurality of gas sensor units provided in the battery module; and

It provides a method for evaluating the performance of a battery module comprising; predicting a damaged battery cell among a plurality of battery cells by comparing the result values measured from each gas sensor unit.

In this case, the step of generating gas inside the battery module may be performed at a temperature of 70 to 90° C. for 6 to 12 days.

In addition, the plurality of gas sensor units may further measure at least one selected from the group consisting of a gas type and a gas concentration value generated when measuring a gas detection time.

In addition, predicting the damaged battery cell may further include determining whether the electrolyte leaks by measuring the insulation resistance inside the battery module, and after predicting the damaged battery cell, verifying the prediction result may further include.

Here, the verifying may be performed by disassembling the battery module, identifying a damaged battery cell among a plurality of battery cells, and comparing the identified damaged battery cell and the damaged battery cell predicted in the predicting the damaged battery cell. there is.

The battery module performance evaluation apparatus and the battery module performance evaluation method according to the present invention can equally realize the deterioration of the battery cell due to long-time use by performing charging and discharging of the battery module under harsh conditions at high temperature during module development. It is possible to obtain a measurement result of a pressure change according to a volume change of a high battery cell.

In addition, the apparatus for evaluating the performance of a battery system and a battery module according to the present invention introduces a plurality of gas sensors into a battery module in which a plurality of battery cells are accommodated, and detects gas measured by the gas sensor when gas is generated from the battery cells Since the position of the gas-generated battery cell can be accurately predicted by comparing the time, it can be usefully used in terms of development of a battery module and/or management of the developed battery module.

1 is a diagram illustrating a system for detecting characteristics of a battery module in the related art.
2 is a diagram showing the configuration of an apparatus for evaluating the performance of a battery module according to an embodiment of the present invention.
3 is a graph showing an evaluation result of the apparatus for evaluating the performance of a battery module according to an embodiment of the present invention.
4 is a view showing an evaluation result of the apparatus for evaluating the performance of a battery module according to an embodiment of the present invention, and is a view showing the location of a damaged battery cell in the battery module.
5 is a diagram showing the configuration of an apparatus for evaluating the performance of a battery module according to another embodiment of the present invention.
6 is a graph showing the insulation performance of the battery module measured in the evaluation process of the battery module in another embodiment of the present invention.

Since the present invention can have various changes and can have various embodiments, specific embodiments will be described in detail in the detailed description.

However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

In the present invention, terms such as "comprises" or "have" are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, but one or more other features It is to be understood that this does not preclude the possibility of addition or existence of numbers, steps, operations, components, parts, or combinations thereof.

Further, in the present invention, when a part of a layer, film, region, plate, etc. is described as being “on” another part, this includes not only cases where it is “directly on” another part, but also a case where there is another part in between. . Conversely, when a portion, such as a layer, film, region, plate, etc., is described as being “under” another portion, this includes not only instances where the other portion is “directly under” but also instances where there is another portion in between. In addition, in the present application, "on" may include the case of being disposed not only on the upper part but also on the lower part.

Hereinafter, the present invention will be described in more detail.

battery system

In one embodiment, the present invention provides a battery system capable of calculating a location of a battery cell generating gas by sensing gas generated from a battery cell provided in a battery module in use in real time.

The battery system according to the present invention includes a battery module and a battery management system (BMS) for controlling the operation and state of the battery module, wherein the battery module includes a module case in which a plurality of battery cells are accommodated, and the and a plurality of gas sensor units spaced apart from each other on the inner surface of the module case and sensing gas generated from the battery cells during charging and discharging and measuring the gas detection time, wherein the battery management system (BMS) includes a gas sensor unit and It is electrically connected to receive measured information from each gas sensor unit, and from the transmitted information, calculates a location of a cell in which gas is generated.

That is, the battery system can sense the gas generated from the battery cells in real time during use by introducing a plurality of gas sensor units spaced apart from each other in the battery module; The plurality of gas sensor units measure the time the gas is sensed and transmit the measured value to the battery management system (BMS), and the battery management system (BMS) compares the received gas detection time to determine the location of the battery cell in which the gas is generated can be predicted accurately.

Hereinafter, each configuration of the battery system according to the present invention will be described in more detail.

First, the battery module provided in the battery system includes a plurality of battery cells, a module case in which the battery cells are accommodated, a gas sensor unit spaced apart from each other on an inner surface of the module case, and a gas discharge unit for discharging gas.

In this case, the battery cell may be applied without particular limitation as long as it is a rechargeable battery capable of charging and discharging. Specifically, the battery cell may be a pouch-type unit cell, and the pouch-type unit cell is embedded in a laminate sheet casing in a state in which an electrode assembly having a cathode/separator/cathode structure is connected to the electrode leads formed outside of the casing. it may have been The electrode leads are drawn out of the sheet and may extend in the same direction or opposite directions.

In the drawings of the present invention, only a pouch-type battery cell having a form in which a pair of electrode leads are drawn out in opposite directions is shown in the drawings for convenience of illustration, but the battery cells applied to the battery module according to the present invention are not necessarily limited thereto. No, it is also possible for a pair of electrode leads to be drawn out in the same direction.

Also, n or more of the battery cells (n is an integer of 2 or more) may be accommodated in the module case in a state in which they are electrically connected. Specifically, the number of battery cells (n) is 2-100, 2-50, 2-40, 10-35, 20-30, or 5-20 of the battery cells according to the use in the battery module. It may be electrically connected by adjusting it, and the electrical connection may be in series or in parallel, and may be a mixed method of series and parallel if necessary.

In addition, the module case in which the battery cells are accommodated serves to protect the battery cells so that they can safely operate even in an external impact or high temperature and/or high humidity environment. To this end, it may have a structure that can dissipate internal heat while preventing moisture from penetrating into the module, and can be made of a high-strength synthetic resin or metal material to surround the battery cells, and in some cases, the module case A heat dissipation material may be additionally included to dissipate heat generated from the stored battery cells.

In addition, the module case may include means for discharging gas generated from the battery cells. Specifically, the module case may include a plurality of gas discharge units to discharge gas generated from the battery cells, and the plurality of gas discharge units may be disposed to be spaced apart from each other.

As an example, when the gas discharge unit has a rectangular parallelepiped shape, a first gas discharge unit located on any first side of the four side surfaces and a second side surface opposite to the first side 2 may include a gas outlet.

As another example, when the module case has a rectangular parallelepiped shape, the gas discharge unit includes any first side of the four sides, a second side opposite to the first side, and between the first side and the second side It may include first to third gas outlets, respectively, on third side surfaces positioned in the .

As another example, when the module case has a rectangular parallelepiped shape, the gas discharge unit may include first to fourth gas discharge units sequentially on each of four side surfaces.

In addition, the gas discharge unit may include an opening formed on the side of the module case, and a blowing means in fluid connection with the opening to quickly discharge the gas generated in the module, and the blowing means is the temperature inside the battery module. When is below 40 ℃, it rotates in the forward direction to circulate the air around the battery cell to lower the temperature around the cell. .

In addition, a gas sensor unit may be individually disposed at a position adjacent to the gas discharge unit. The gas sensor unit detects the gas generated inside the module case, measures the time the gas is sensed at the same time, and calculates the position of the electric cell where the gas is generated by comparing the measured gas detection time, the battery Gas generated from the battery cells may be more quickly detected by being individually disposed at adjacent positions of the gas discharge units spaced apart from each other in the case.

In addition, the plurality of gas sensor units may further measure at least one selected from the group consisting of a gas type and a gas concentration value other than the gas detection time. The gas type and/or gas concentration value may be measured by an analytical device such as gas chromatography (GC), Fourier transform infrared spectroscopy (FT-IR), or precision gas mass spectrometer (PGMS). And, to this end, the gas sensor unit may include the analysis devices on the outer surface of the module case so as to be fluidly connected to the opening formed in the module case. In general, since the weight of a gas is different depending on the type of gas, and the diffusion rate is different depending on the concentration, which may affect the movement speed of the gas, the present invention provides the gas type and / Alternatively, the position of the battery cell in which the gas is generated may be calculated with higher accuracy by additionally measuring the gas concentration value.

In addition, the gas sensor unit may be used without being particularly limited as long as it includes a sensor used in the industry to detect gas. Specifically, the gas sensor unit is a hydrocarbon gas such as methane, ethane, propane, butane discharged or leaking from the battery cell, carbon dioxide (CO ₂ ) gas, carbon monoxide (CO) gas, oxygen (O ₂ ) Volatile containing gas, etc. It may include a detection sensor such as a metal oxide sensor, a chemical resistance sensor, a semiconductor type sensor, a photoion sensor, or an infrared sensor capable of detecting an organic compound (VOC) in a gaseous form. As an example, the gas sensor unit may include a semiconductor-type sensor that detects a specific gas component contained in the gas and changes an electrical signal according to the concentration thereof.

In addition, the gas sensor unit is electrically connected to the battery management system (BMS) and transmits measured information, for example, measured values such as gas detection time, gas type and/or gas concentration to the battery management system (BMS), The management system (BMS) may calculate the position of the battery cell generating gas from the information received from the gas sensor unit.

For example, since the gas sensor unit adjacent to the battery cell in which gas is generated has a shorter gas detection time than other gas sensor units, the first gas sensor unit adjacent to the first gas discharge unit located on the first side of the module case and ; When a second gas sensor unit adjacent to a second gas discharge unit located on a second side opposite to the first side surface of the module case is included, the gas generated when gas is generated inside the module is separated from the first gas sensor unit and the second A location of a battery cell generating gas may be calculated by measuring a time sensed by the gas sensor and using a difference between the measured times.

In addition, the battery management system (BMS) is a device that manages battery cell capacity management/protection, usage history, life prediction, overcharge/overdischarge protection, communication, etc. so that it can be safely used while exhibiting the maximum performance of the battery cell, a gas sensor When the value measured in the unit reaches a preset value, a function of notifying the user of damage to the battery cell may be performed. For example, the battery management system (BMS) transmits an alarm signal to the user when the gas concentration measured by the gas sensor unit exceeds 10% of the total volume of the module case or when a specific gas is detected, so that the user can control the battery module. It can cause them to temporarily stop operation or take countermeasures such as replacing or repairing gas-generating battery cells.

Furthermore, the battery system according to the present invention may further include an insulation resistance sensor that is positioned on the inner surface of the module case to measure the insulation resistance of the battery module and transmit the measured value to the battery management system (BMS). When a battery cell is used for a long time, cell swelling is induced and damage to the battery cell occurs. Such damage to the battery cell may cause electrolyte leakage. In this case, since the leaked electrolyte reduces the insulation resistance in the battery module, the insulation resistance of the inner surface of the module case, more specifically, the portion in contact with the electrode lead of the battery cell accommodated in the module case (eg, the frame of the bus bar) etc); When the insulation resistance of the lower end of the battery cell and the inner bottom surface of the module case in contact with the lower end is measured in real time for the lower short-circuit prevention substrate (eg, insulating rubber, insulating film, etc.), it occurs due to swelling of the battery cell. It is possible to know whether the electrolyte is leaking or not, and accordingly, it is possible to more accurately predict the damage time (gas venting time) and the like of the battery cell.

Meanwhile, the battery system according to the present invention may be a battery pack or an energy storage system (ESS) used in a vehicle or the like.

Specifically, the battery system is used as a power source, has a limited mounting space, and is exposed to frequent vibration and strong shock, etc. In addition, a battery system used as a power source for a vehicle may be manufactured by combining it according to a desired output and capacity.

In addition, the battery system may be used as an energy storage system (ESS) for storing electricity produced by utilizing renewable energy such as solar power, wind power, and tidal power.

Since the battery system according to the present invention has the above-described configuration, it is possible to quickly and accurately determine the battery cell generating the gas by sensing the gas generated in the battery module in real time, thereby reducing the risk of failure and accident of the battery system. There is an advantage that can significantly reduce and improve the operating efficiency of the battery system.

Battery module performance evaluation device

In addition, in one embodiment, the present invention provides an apparatus for evaluating the performance of a battery module capable of performing performance evaluation on a battery module used for a long time by exposing the battery module to severe conditions.

The apparatus for evaluating the performance of a battery module according to the present invention fixes the battery module under development or before use in the chamber, and maintains the temperature inside the chamber at a high temperature and stores it under severe conditions to prevent deterioration of the battery cells accommodated in the battery module within a short time. swelling may be induced. As a result, damage to the battery cells occurs, and gas is generated due to damage to the battery cells inside the battery module, and the generated gas is sensed using a plurality of gas sensors provided inside the battery module, and a gas detection signal is transmitted. transmitted to the data processing unit. The data processing unit compares the gas detection signals transmitted from the plurality of gas sensor units to derive the time at which the gas is sensed by each gas sensor unit, and compares the derived time to accurately determine the location of the damaged battery cell among the plurality of battery cells It can be predicted, and in some cases, it is possible to additionally predict when the battery cell is damaged.

To this end, the performance evaluation apparatus of the battery module includes a chamber; a temperature controller positioned inside the chamber to control the internal temperature of the chamber to an average of 60 to 100°C; A module case stored in the chamber and accommodating a plurality of battery cells, a plurality of gas sensor units that are spaced apart from each other on the inner surface of the module case, detect gas generated inside the module case, and measure the gas detection time a battery module provided with; It is electrically connected to the plurality of gas sensor units to receive the gas detection time measured from each gas sensor unit, and compares the gas detection time received from each gas sensor unit to repair damaged battery cells among the plurality of battery cells. It may include a data processing unit that predicts.

In this case, the chamber provides a space for storing the battery module in the performance evaluation process of the battery module. The chamber may be largely composed of a double structure, specifically, a first housing and a second housing surrounding the first housing. In addition, a battery module may be stored in the first housing. In particular, the first housing is a space that provides a place for realizing the high-temperature characteristics of the battery module, and the inner surface of the first housing may be treated to include a portion of a thermally conductive material or the surface may be coated. For example, the interior of the first housing may include a metal material such as SUS, copper, or aluminum. In addition, the second housing positioned outside the first housing is preferably made of an insulating material such as Teflon. Hereinafter, the first housing is referred to as a chamber for convenience of description.

In addition, the first housing for storing the battery module may have an explosion-proof door installed. In a specific example, the first housing may have a structure in which an explosion-proof door is installed for the purpose of blocking storm pressure and heat generated from various weapons, and at the same time blocking damage caused by debris.

In addition, the temperature control unit is located inside the chamber and performs a function of controlling the internal temperature of the chamber to 60 ℃ to 100 ℃. To this end, the temperature control unit may include a heating member, and the heating member may be a heater supplied with power from a battery module or a heat transfer assembly composed of a plurality of heating wires heated by receiving power. The heat transfer assembly may have a structure in which heating wires are arranged in a grid structure. This grid structure allows the high flow rate air generated from the blower to easily flow through the grid, and the fluid flowing through the heat transfer assembly It has the advantage of not generating a large resistance to In addition, in the grid structure, since a plurality of heating wires are spaced apart, compared to a structure in which the heating wires are concentrated, the inside of the pack case can be heated more quickly.

In addition, the temperature control unit may control the average temperature inside the chamber in the range of 60 to 100 ℃, specifically 60 to 90 ℃, 60 to 80 ℃, 70 to 90 ℃ or 80 to 90 ℃ can be controlled . The present invention can induce deterioration under severe conditions for a battery module under development or a battery module before use in a short time by adjusting the temperature range inside the chamber controlled by the temperature controller as described above, and the deterioration of the battery module induced in this way is induced similarly to the deterioration of a battery module that has been used for many years, so information related to a phenomenon occurring due to the deterioration of the battery module, such as gas generation and swelling of the battery cell (eg, the amount of pressure change according to the volume change of the battery cell, etc.) can be obtained with high reliability.

In addition, the battery module stored in the chamber includes a plurality of battery cells, a module case in which the battery cells are accommodated, a gas sensor unit spaced apart from each other on an inner surface of the module case, and a gas discharge unit for discharging gas.

In this case, the battery cell may be applied without particular limitation as long as it is a rechargeable battery capable of charging and discharging. Specifically, the battery cell may be a pouch-type unit cell, and the pouch-type unit cell is embedded in a laminate sheet casing in a state in which an electrode assembly having a cathode/separator/cathode structure is connected to the electrode leads formed outside of the casing. it may have been The electrode leads are drawn out of the sheet and may extend in the same direction or opposite directions.

In the drawings of the present invention, only a pouch-type battery cell having a form in which a pair of electrode leads are drawn out in opposite directions is shown in the drawings for convenience of illustration, but the battery cells applied to the battery module according to the present invention are not necessarily limited thereto. No, it is also possible that a pair of electrode leads are drawn out in the same direction.

Also, n or more of the battery cells (n is an integer of 2 or more) may be accommodated in the module case in a state in which they are electrically connected. Specifically, the number of battery cells (n) is 2-100, 2-50, 2-40, 10-35, 20-30, or 5-20 of the battery cells according to the use in the battery module. It may be electrically connected by adjusting it, and the electrical connection may be in series or in parallel, and may be a mixed method of series and parallel if necessary.

In addition, the module case in which the battery cells are accommodated serves to protect the battery cells so that they can safely operate even in an external impact or high temperature and/or high humidity environment. To this end, it may have a structure that can dissipate internal heat while preventing moisture from penetrating into the module, and can be made of a high-strength synthetic resin or metal material to surround the battery cells, and in some cases, the module case A heat dissipation material may be additionally included to dissipate heat generated from the stored battery cells.

In addition, the module case may include means for discharging gas generated from the battery cells. Specifically, the module case may include a plurality of gas discharge units on a side surface or an upper surface to discharge gas generated from the battery cells, and the plurality of gas discharge units may be disposed to be spaced apart from each other.

As an example, when the module case has a rectangular parallelepiped shape, the gas discharge unit includes a first gas discharge unit located on any first side of the four side surfaces and a first gas discharge unit located on a second side opposite to the first side surface 2 may include a gas outlet.

As another example, when the module case has a rectangular parallelepiped shape, the gas discharge unit includes any first side of the four sides, a second side opposite to the first side, and between the first side and the second side It may include a first gas discharge unit to a third gas discharge unit, respectively, on the third side surface located in the .

As another example, when the module case has a rectangular parallelepiped shape, the gas discharge unit may include a first gas discharge unit to a fourth gas discharge unit sequentially on each of the four side surfaces.

In addition, the gas discharge unit may include an opening formed on the side of the module case, and a blowing means in fluid connection with the opening to quickly discharge the gas generated in the module, and the blowing means is the temperature inside the battery module. When is below 40 ℃, it rotates in the forward direction to circulate the air around the battery cell to lower the temperature around the cell. .

In addition, a gas sensor unit may be individually disposed at a position adjacent to the gas discharge unit. The gas sensor unit detects the gas generated inside the module case, measures the time the gas is sensed at the same time, and calculates the position of the electric cell where the gas is generated by comparing the measured gas detection time, the battery Gas generated from the battery cells can be more quickly detected by being individually disposed at adjacent positions of the gas discharge units spaced apart from each other in the case.

As an example, the battery module stored in the performance evaluation device of the battery module may have a structure in which a first gas outlet and a second gas outlet are formed on a side surface of a module case, and the first gas outlet and the second gas The discharge unit may have a structure in which the first gas sensor unit and the second gas sensor unit are respectively disposed. In this case, the first gas discharge unit has a structure formed on one side of the battery module, and the second gas discharge unit has a structure formed on the other side surface of the battery module. Accordingly, the first gas sensor unit is disposed on one side of the battery module, and the second gas sensor unit is disposed on the other side of the battery module.

That is, the first gas sensor unit may be disposed at the front of the battery module, and the second gas sensor unit may be disposed at the rear, which is an area opposite to the area where the first gas sensor unit is disposed. For example, when one battery cell is damaged in the battery module, the gas generated inside the battery module is discharged to the first and second gas outlets. In addition, the generated gas may be detected by first and second gas sensor units respectively disposed on the first and second gas discharge units.

In addition, the plurality of gas sensor units may further measure one or more selected from the group consisting of a gas type and a gas concentration value other than the gas detection time. The gas type and/or gas concentration value may be measured by an analytical device such as gas chromatography (GC), Fourier transform infrared spectroscopy (FT-IR), or precision gas mass spectrometer (PGMS). And, to this end, the gas sensor unit may include the analysis devices on the outer surface of the module case so as to be fluidly connected to the opening formed in the module case. In general, since the weight of a gas is different depending on the type of gas, and the diffusion rate is different depending on the concentration, which may affect the movement speed of the gas, the present invention provides the gas type and / Alternatively, the position of the battery cell in which the gas is generated may be calculated with higher accuracy by additionally measuring the gas concentration value.

In addition, as long as the gas sensor unit includes a sensor used in the industry to detect gas, it may be used without particular limitation. Specifically, the gas sensor unit is a hydrocarbon gas such as methane, ethane, propane, butane discharged or leaking from the battery cell, carbon dioxide (CO ₂ ) gas, carbon monoxide (CO) gas, oxygen (O ₂ ) Volatile containing gas, etc. It may include a detection sensor such as a metal oxide sensor, a chemical resistance sensor, a semiconductor type sensor, a photoion sensor, or an infrared sensor capable of detecting an organic compound (VOC) in a gaseous form. As an example, the gas sensor unit may include a semiconductor-type sensor that detects a specific gas component contained in the gas and changes an electrical signal according to the concentration thereof.

In addition, as described above, the data processing unit predicts the location of the damaged battery cell among the plurality of battery cells accommodated in the module case by comparing the gas detection times detected by the plurality of gas sensor units. Specifically, the plurality of gas sensor units, or the first gas sensor unit and the second gas sensor unit detect gas generated inside the battery module, and transmit a gas detection signal to the data processing unit. Then, the data processing unit may predict a damaged battery cell among the plurality of battery cells by comparing the gas detection times detected by the first gas sensor unit and the second gas sensor unit.

That is, the data processing unit may compare the gas detection times of the plurality of first gas sensor units and the second gas sensor unit to predict the time and/or location at which the battery cells are damaged. For example, when the gas detection times of the first and second gas sensor units are similar, the difference between the times when the generated gas moves to the first gas sensor unit and the second gas sensor unit is small. 2 It can be determined that the gas sensor is disposed in the central region of the battery module, which is the central region. Also, if the gas detection time of the second gas sensor unit is faster than that of the first gas sensor unit, it may be determined that the damaged battery cells are disposed in an area adjacent to the second gas sensor unit.

In one embodiment, the apparatus for evaluating the performance of the battery module according to the present invention further includes an output unit for outputting the gas concentration sensed by the gas sensor unit as a resistance value over time. In particular, the data processing unit may predict a damaged battery cell based on a gas detection time and a peak value output from the output unit. Meanwhile, the output unit may be a conventional monitoring device or an output device.

In addition, the apparatus for evaluating the performance of the battery module according to the present invention further includes a storage unit for storing the result of the data processing unit. Specifically, the storage unit receives the result from the data processing unit and stores it.

In the operation of the data processing unit and the storage unit, it is possible for an operator to directly operate the data processing unit and the storage unit, but it is also possible to operate by an automated system.

As an example, it further includes a charging/discharging unit electrically connected to a battery cell accommodated in the battery module. The charging/discharging unit may supply charging power to the secondary battery or receive discharging power from the secondary battery. Here, the supply of charging power to the secondary battery is not necessarily limited to the meaning of supplying sufficient power to fully charge the secondary battery. Supplying charging power to the secondary battery may be used as supplying enough power to measure the voltage of the first electrode lead, the second electrode lead, etc. for performance evaluation of the secondary battery. Since the meaning of receiving discharge power from the secondary battery can be used similarly, repeated descriptions will be omitted.

Furthermore, the apparatus for evaluating the performance of the battery module according to the present invention further includes a temperature sensor for sensing the temperature inside the chamber and the battery module. The temperature sensor unit is for detecting the internal temperature of the chamber and the ambient temperature of the battery module when the battery cells inside the battery module are damaged. Although not shown in the drawing, the temperature sensor unit may include one or a plurality of units, and may detect temperatures of various parts of the battery module.

In addition, the performance evaluation apparatus of the battery module according to the present invention may further include an insulation resistance sensor unit that measures the insulation resistance of the battery module on the inner surface of the module case and transmits the measured insulation resistance value to a data processing unit electrically connected In addition, the insulation resistance sensor unit may include an insulation monitoring device for measuring insulation resistance inside the battery module. If the battery cell is damaged during the evaluation of the swelling characteristic of the battery cell, the insulation resistance decreases due to leakage of the electrolyte inside the battery cell. In this case, the insulation characteristic monitoring device may monitor the insulation resistance of the battery module to determine whether the electrolyte is leaking, and thus may predict the damage time (eg, venting time) of the battery cell.

The battery module performance evaluation device according to the present invention performs the charging and discharging of the battery module under harsh conditions at high temperature when developing the battery module, so that deterioration of the battery cell due to long-time use can be equally implemented, so the volume change of the battery cell with high reliability The result of measuring the pressure change can be obtained. In addition, the performance evaluation apparatus of the battery module introduces a plurality of gas sensor units into the battery module in which the plurality of battery cells are accommodated, and compares the gas detection time measured by the gas sensor unit when gas is generated from the battery cells, and the deviation thereof Since it is possible to accurately predict the location of a battery cell that has generated gas, it can be usefully used in the development of a battery module.

Battery module performance evaluation method

Furthermore, the present invention, in one embodiment, provides a method for evaluating the performance of a battery module performed using the apparatus for evaluating the performance of the battery module according to the present invention described above.

The performance evaluation method of the battery module according to the present invention can evaluate the performance of the battery module with high accuracy and reliability within a short time by using the battery module performance evaluation apparatus of the present invention described above.

At this time, the performance evaluation method includes the steps of mounting a battery module under development or before use in a chamber, and controlling the internal temperature of the mounted chamber to 60 to 100° C. to generate gas inside the battery module; measuring the gas detection time by detecting gas generated inside the battery module with a plurality of gas sensor units provided in the battery module; and predicting a damaged battery cell among a plurality of battery cells by comparing result values measured from each gas sensor unit.

That is, the performance evaluation method implements the swelling of the battery cell by storing the battery module for a short time (eg, 30 days or less) under harsh conditions at high temperature, and accordingly, the swelling of the battery cell accommodated in the battery module. The ring induces damage (venting) of the battery cell, and the gas flows out from the inside of the battery module due to the damage to the battery cell. In this case, the plurality of gas sensor units formed in the battery module sense gas generated inside the battery module and transmit the gas detection signal to the data processing unit. The data processing unit predicts damaged battery cells among the plurality of battery cells by comparing the gas detection times detected by the plurality of gas sensor units, and in some cases, comparing the gas detection times of the plurality of gas sensor units to determine whether the battery cells are It predicts the time of damage.

Here, generating the gas inside the battery module may control the average temperature inside the chamber in the range of 60 to 100 ℃, specifically 60 to 90 ℃, 60 to 80 ℃, 70 to 90 ℃ or 80 to 90 ℃ ℃ can be controlled.

In addition, the step of generating the gas inside the battery module may be performed for 30 days or less for the battery module, specifically for 1 to 25 days; for 1 to 20 days; for 5 to 20 days; for 5 to 15 days; or 6 to 12 days.

The present invention can induce deterioration under severe conditions for a battery module under development or a battery module before use in a short time by adjusting the temperature and the execution period inside the chamber in the step of generating gas inside the battery module as described above, Since the induced deterioration of the battery module is induced similarly to the deterioration of the battery module that has been used for several years, information related to a phenomenon occurring due to the deterioration of the battery module, for example, gas generation of the battery cell, swelling, etc. (eg, the volume change of the battery cell) pressure change, etc.) can be obtained with high reliability.

In addition, the step of measuring the gas detection time is a step of measuring a time for which a plurality of gas sensor units are generated from the battery cell to sense the gas, and the gas is sensed. In this case, the plurality of gas sensor units may further measure at least one selected from the group consisting of a gas type and a gas concentration value other than the gas detection time. The gas type and/or gas concentration value may be measured by an analytical device such as gas chromatography (GC), Fourier transform infrared spectroscopy (FT-IR), or precision gas mass spectrometer (PGMS). And, to this end, the gas sensor unit may include the analysis devices on the outer surface of the module case so as to be fluidly connected to the opening formed in the module case. In general, since the weight of a gas is different depending on the type of gas, and the diffusion rate is different depending on the concentration, which may affect the movement speed of the gas, the present invention provides the gas type and Alternatively, the position of the battery cell in which the gas is generated may be calculated with higher accuracy by additionally measuring the gas concentration value.

In addition, the battery module mounted in the chamber may have a structure in which a plurality of gas outlets are formed. As an example, the battery module has a structure in which a first gas discharge unit and a second gas discharge unit are formed on one side and the other side, respectively, and the first and second gases in the first gas discharge unit and the second gas discharge unit Each sensor unit is disposed. Accordingly, in the process of predicting the damaged battery cell, the gas detection time detected by the first gas sensor unit and the second gas sensor unit may be compared with each other. Since the process of predicting the damaged battery cell has been described above, a detailed description thereof will be omitted.

Meanwhile, the storing of the battery module may further include outputting the gas concentration sensed by the gas sensor unit as a resistance value according to time. In a specific example, the damaged battery cell may be predicted based on the gas detection time and the peak value output from the output unit. In addition, the battery module evaluation method according to the present invention further includes the process of storing the result of the data processing unit.

In addition, the method for evaluating the performance of a battery module according to the present invention may further include a charging/discharging process of driving the charging and discharging of the battery cells stored in the battery module. Specifically, in the charging/discharging process, charging power may be supplied to the secondary battery or discharging power may be supplied from the secondary battery. In this case, supplying charging power to the secondary battery is necessarily sufficient power to fully charge the secondary battery It is not limited to the meaning of supplying.

In addition, the step of generating the gas inside the battery module may further include the process of sensing the temperature of the inside of the chamber and the battery module. This is to reduce the deviation between the chamber interior and the ambient temperature of the battery module when the battery cells are damaged in the step of generating gas inside the battery module, respectively, and the temperature sensor unit is not shown in the drawing, but includes a plurality and can detect the temperature of various parts of the battery module.

In addition, predicting the damaged battery cell may further include determining whether the electrolyte leaks by measuring the insulation resistance inside the battery module. When the battery cell is damaged, the insulation resistance decreases due to leakage of the electrolyte inside the battery cell. That is, through the process of monitoring the insulation characteristics of the battery module, it is possible to know whether the electrolyte is leaking inside the battery module, and accordingly, the damage time (eg, venting time) of the battery cell can be predicted.

In a specific example, the process of monitoring the insulation resistance of the battery module may be performed simultaneously with the process of predicting a damaged battery cell among the plurality of battery cells. In the storing of the battery module, a damaged battery cell among a plurality of battery cells may be predicted by monitoring gas generation, and at the same time, a damage time of the battery cell may be predicted by monitoring the insulation resistance.

Furthermore, the method for evaluating the performance of the battery module according to the present invention according to claim 12, after predicting the damaged battery cell, may further include verifying the prediction result, wherein the verifying comprises disassembling the battery module. to identify a damaged battery cell among a plurality of battery cells, and compare the identified damaged battery cell with the damaged battery cell predicted in the step of predicting the damaged battery cell.

According to the battery module performance evaluation apparatus and battery module evaluation method according to the present invention, the gas detection times sensed from a plurality of gas sensor units are compared with each other, and the peak values are compared with each other to select damaged battery cells among n battery cells. can be predicted easily. In addition, by monitoring the battery module in real time with the insulation characteristic monitoring device, it is possible to easily predict whether or not the battery cell is damaged or when the battery cell is damaged.

Hereinafter, various forms of an apparatus for evaluating the performance of a battery module and a method for evaluating a performance of a battery module according to the present invention will be described with reference to the drawings.

(First embodiment)

2 is a diagram showing the configuration of an apparatus for evaluating the performance of a battery module according to an embodiment of the present invention.

Referring to FIG. 2 , the apparatus 100 for evaluating the performance of a battery module according to the present invention includes a chamber 110 ; a battery module 120 stored in the chamber 110 and having a plurality of gas outlets (not shown) in which n (n is an integer of 2 or more) battery cells are accommodated; a temperature control unit 130 for controlling the internal temperature of the chamber 110 in an average temperature range of 60 to 100° C.; a gas sensor unit 140 positioned inside the chamber 110 to detect gas leaking from the inside of the battery module 120; and a data processing unit 150 for predicting a damaged battery cell among the n battery cells by comparing the gas detection time detected by each gas sensor unit 140 with each other.

Specifically, the battery module performance evaluation apparatus 100 according to the present invention stores the battery module 120 in the high-temperature chamber 110 to implement swelling of the battery cell. Accordingly, battery cells accommodated in the battery module 120 are vented due to swelling, and gas is generated inside the battery module 120 due to the damage to the battery cells. At this time, the gas sensor unit 140 disposed in each of the plurality of gas discharge units formed in the battery module 120 detects the gas generated inside the battery module 120 , and transmits the gas detection signal to the data processing unit 150 . do. In addition, the data processing unit 150 compares the gas detection times detected by the plurality of gas sensor units 140 with each other, and compares the result values measured by the respective gas sensor units 140 with each other, so that n battery cells Damaged battery cells can be predicted. Furthermore, the data processing unit 150 may predict when the battery cells are damaged by comparing the gas detection times of the plurality of gas sensor units 140 .

The battery module 120 of the battery module performance evaluation apparatus 100 according to the present invention has a structure in which two gas outlets are formed. Specifically, the battery module 120 has a structure in which a first gas discharge unit and a second gas discharge unit are formed, and the first gas discharge unit and the second gas discharge unit have a first gas sensor unit 141 and a second gas discharge unit. The sensor unit 142 has a structure in which each is disposed. In this case, the first gas discharge unit has a structure formed on one side of the battery module 120 , and the second gas discharge unit has a structure formed on the other side surface of the battery module 120 . Accordingly, the first gas sensor unit 141 is disposed on one side of the battery module 120 , and the second gas sensor unit 142 is disposed on the other side of the battery module 120 .

That is, the first gas sensor unit 141 is disposed at the front of the battery module 120 , and the second gas sensor unit 142 is disposed at the rear, which is an area opposite to the area where the first gas sensor unit 141 is disposed. are placed The gas sensor unit 140 is a device that detects a specific gas component included in the gas with a gas sensor and changes an electrical signal according to the concentration thereof.

For example, when one battery cell is damaged in the battery module 120 , the gas generated inside the battery module 120 is discharged to the first gas discharge unit and the second gas discharge unit. In addition, the generated gas is sensed by the first gas sensor unit 141 and the second gas sensor unit 142 disposed in the first gas discharge unit and the second gas discharge unit, respectively. If the gas detection times of the first gas sensor unit 141 and the second gas sensor unit 142 are similar to each other, the generated gas flows to the first gas sensor unit 141 and the second gas sensor unit 142 . Since the moving time means the same, it can be determined that the battery module 120 is disposed in the central region.

In addition, when one battery cell is damaged in the battery module 120 , the gas detection time of the second gas sensor unit is faster than that of the first gas sensor unit 141 , and the result value measured by the gas sensor unit If this is large, it may be determined that the damaged battery cell is disposed in an area adjacent to the second gas sensor unit 142 .

On the other hand, the performance evaluation apparatus 100 of the battery module according to the present invention further includes an output unit 160 for outputting the gas concentration sensed by the gas sensor unit 140 as a resistance value over time. In particular, the data processing unit 150 may predict a damaged battery cell based on the gas detection time and the peak value output from the output unit 160 .

In addition, the battery module performance evaluation apparatus 100 according to the present invention further includes a charging/discharging unit 180 electrically connected to the battery module 120 to drive charging and discharging of battery cells stored in the battery module. The charging/discharging unit 180 may be electrically connected to the battery module to supply charging power to the battery cells inside the battery module 120 or receive discharging power from the battery cells. Here, the supply of charging power to the battery cells is not necessarily limited to the meaning of supplying sufficient power to the extent of buffering the battery cells. Since the meaning of receiving discharge power from a battery cell can be used similarly, a repeated description will be omitted. On the other hand, in the present invention, the battery module 120 is stored at a high temperature, and by performing charging and discharging, it is possible to implement swelling at a high temperature.

Furthermore, the apparatus 100 for evaluating the performance of the battery module according to the present invention further includes a temperature sensor unit (not shown) for sensing the temperature inside the chamber 110 and the battery module 120 . The temperature sensor unit is for detecting the internal temperature of the chamber 110 and the ambient temperature of the battery module 120 when the battery cells inside the battery module 120 are damaged. Although not shown in the drawing, the temperature sensor unit may include a plurality of units, and may detect temperatures of various parts of the battery module 120 .

In one embodiment, the battery module was evaluated using the performance evaluation device of the battery module.

More specifically, the battery module containing 14 battery cells in the chamber of the battery module performance evaluation device was stored for 10 days. At this time, the battery cells stored inside the battery module were charged and discharged, and the temperature inside the chamber was maintained at an average of 80°C. In the step of storing the battery module, the gas generated inside the battery module was sensed by the first gas sensor unit and the second gas sensor unit, and the results are shown in FIG. 4 .

3 is a graph showing gas chromatography (GC) results provided in the apparatus for evaluating the performance of a battery module according to the present invention, and shows the concentration of the gas generated over time as the peak intensity.

A process of predicting a damaged battery cell among the battery cells accommodated in the battery module in the step of storing the battery module at a high temperature will be described with reference to FIG. 3 .

First, looking at peaks 1 and 2 among the six peaks, it can be seen that the gas detection times detected by the first gas sensor unit and the second gas sensor unit are similar, and the first gas sensor unit and the second gas sensor unit It can be seen that the peak values at are also similar to each other. This means that the distance between the damaged battery cell and the first gas sensor unit is similar to the distance between the damaged battery cell and the second gas sensor unit. That is, it can be predicted that the battery cells disposed in the central region of the battery module are damaged through the peak values of Nos. 1 and 2.

In addition, looking at the peaks of No. 3 and No. 4, it can be seen that the peak value of No. 3 was detected before No. 4, and the peak value of No. 3 was higher than No. 4. This means that the damaged battery cells in the battery module are located closer to the first gas sensor unit than to the second gas sensor unit. Specifically, since the damaged battery cell is disposed adjacent to the first gas sensor unit, it means that the gas may be first detected by the first gas sensor unit.

Also, looking at the peaks of Nos. 5 and 6, it can be seen that the peak value of No. 5 was detected before the peak value of No. 6, and the peak value of No. 5 was higher than that of No. 6. This means that the damaged battery cells in the battery module are located closer to the second gas sensor unit than to the first gas sensor unit.

Furthermore, as an embodiment according to the present invention, in order to verify the result predicted through the performance evaluation device of the battery module, the battery module stored in the chamber was disassembled to confirm the damaged battery cell, and the result is shown in FIG. 4 .

4 is a view showing an evaluation result of the apparatus for evaluating the performance of a battery module according to an embodiment of the present invention, and is a view showing the location of a damaged battery cell in the battery module.

Referring to FIG. 4 , it can be seen that three of the 14 battery cells are damaged. Referring to FIG. 3 described above, it is determined that peaks 1 and 2 are due to damage to the battery cell 7-1, and peaks 3 and 4 are determined to be caused by damage to the battery cell 4-2. In addition, it is determined that the peaks of Nos. 5 and 6 are due to damage to the battery cells of 10-2.

According to the battery module performance evaluation apparatus and battery module evaluation method of the present invention, it is determined that a damaged battery cell among a plurality of battery cells can be easily predicted by comparing the gas detection times detected by the plurality of gas sensor units with each other.

(Second embodiment)

5 is a diagram illustrating a configuration of an apparatus for evaluating performance of a battery module according to another embodiment of the present invention.

Referring to FIG. 5 , the apparatus 200 for evaluating the performance of a battery module according to the present invention includes a chamber 210 ; a battery module 220 stored in the chamber 210 and having a plurality of gas outlets (not shown) in which n (n is an integer of 2 or more) battery cells are accommodated; a temperature controller 230 for controlling the internal temperature of the chamber 210 to an average temperature range of 60 to 100° C.; a gas sensor unit 240 disposed in each of the plurality of gas discharge units to detect gas generated inside the battery module 220; and a data processing unit 250 that compares the gas detection times sensed by the respective gas sensor units 240 with each other and predicts damaged battery cells among the n battery cells by comparing peak values with each other.

The battery module 220 of the battery module performance evaluation apparatus 200 according to the present invention has a structure in which two gas outlets are formed. Specifically, the battery module 220 has a structure in which first and second gas discharge units are formed, and first and second gas sensor units 241 and 242 are respectively disposed in the first and second gas discharge units. am. In this case, the first gas discharge unit has a structure formed on one side of the battery module 220 , and the second gas discharge unit has a structure formed on the other side surface of the battery module 220 . Accordingly, the first gas sensor unit 241 is disposed on one side of the battery module 220 , and the second gas sensor unit 242 is disposed on the other side of the battery module 220 .

In addition, the performance evaluation device 200 of the battery module according to the present invention includes an insulation characteristic monitoring device (Insulation Monitoring Device, 270). Specifically, the insulation characteristic monitoring device 270 is to monitor the insulation characteristic of the battery module 220 .

If the battery cell is damaged during the evaluation process of the battery module, the insulation resistance decreases due to leakage of the electrolyte inside the battery cell. That is, the insulation characteristic monitoring device 270 monitors the insulation resistance of the battery module 220 to know whether the electrolyte is leaking, and accordingly, it is possible to predict the damage time (venting time) of the battery cell.

On the other hand, the description of each configuration such as the data processing unit 250, the output unit 260, the charging/discharging unit 280 of the battery module performance evaluation device 200 according to the present invention has been described above, and the detailed description of each configuration is to be omitted.

Furthermore, in an embodiment according to the present invention, the battery module was evaluated using the performance evaluation device of the battery module. More specifically, the battery module containing 14 battery cells in the chamber of the battery module performance evaluation device was stored for 10 days. At this time, the battery cells stored in the battery module were charged and discharged while maintaining the internal temperature of the chamber at an average of 80°C, and the insulation resistance of the battery module was monitored. The results are shown in FIG. 6 .

6 is a graph showing the insulation resistance of the battery module measured in the evaluation process of the battery module in another embodiment of the present invention. Referring to FIG. 6 , it can be seen that the insulation resistance of the battery module decreases after 6 days after the battery module is stored. This appears to be due to leakage of the electrolyte due to damage to the battery cells accommodated in the battery module.

Meanwhile, since the detailed description of each process of the battery module evaluation method according to the present invention has been described above, the detailed description of each process will be omitted.

According to the battery module performance evaluation apparatus and battery module evaluation method according to the present invention, the gas detection times detected by a plurality of gas sensor units are compared with each other, and values measured from the gas sensor units are compared with each other to obtain n battery cells Damaged battery cells can be easily predicted. In addition, it is determined that the battery module is monitored in real time with the insulation characteristic monitoring device to easily predict whether or not the battery cell is damaged or when the battery cell is damaged.

In the above, preferred embodiments of the present invention have been described with reference to the drawings, but those skilled in the art or those having ordinary knowledge in the technical field will not depart from the spirit and technical scope of the present invention described in the claims. It will be understood that various modifications and variations of the present invention can be made without departing from the scope of the present invention.

Accordingly, the technical scope of the present invention should not be limited to the content described in the detailed description of the specification, but should be defined by the claims.

10, 100, 200: battery module performance evaluation device
11, 110, 210: chamber
12, 120, 220: battery module
13, 130, 230: temperature control unit
14: sensor unit
140, 240: gas sensor unit
141, 241: first gas sensor unit
142, 242: second gas sensor unit
150, 250: data processing unit
160, 260: output unit
270: insulation characteristic monitoring device
18, 180, 280: charge/discharge unit

Claims (15)

In the battery system comprising a battery module, and a battery management system (BMS) for controlling the operation and state of the battery module,
The battery module includes a plurality of battery cells, a module case in which the battery cells are accommodated, and a plurality of spaced apart from each other on the inner surface of the module case to detect gas generated from the battery cells during charging and discharging, and measuring a gas detection time a gas sensor unit of
The battery management system (BMS) is electrically connected to a gas sensor unit to receive measured information from each gas sensor unit, and compare the transmitted information to calculate the location of a cell in which gas is generated.
The method of claim 1,
The gas sensor unit further measures one or more selected from the group consisting of a gas type and a gas concentration value,
A battery management system (BMS) receives measurement values from a plurality of gas sensor units spaced apart from each other, and compares the received measurement values to calculate the location of a cell in which gas is generated.
The method of claim 1,
A battery management system (BMS) is a battery system that notifies a user of battery cell damage when the value measured by the gas sensor reaches a preset value.
According to claim 1,
The module case includes a plurality of gas outlets,
A battery system in which a gas sensor unit is individually disposed adjacent to each gas discharge unit.
4. The method of claim 3,
The gas discharge unit includes a first gas discharge unit located on a first side surface of the module case and a second gas discharge unit located on a second side surface opposite to the first side surface.
The method of claim 1,
The battery system further includes an insulation resistance sensor unit positioned on the inner surface of the module case to measure the insulation resistance of the battery module and transmit the measured value to the battery management system (BMS).
According to claim 1,
The battery system is a battery system, characterized in that the vehicle battery pack or energy storage system (ESS).
chamber;
a temperature controller positioned inside the chamber to control the internal temperature of the chamber to an average of 60 to 100°C;
A module case mounted inside the chamber and accommodating a plurality of battery cells, a plurality of gas sensor units that are spaced apart from each other on the inner surface of the module case, detect gas generated inside the module case, and measure the gas detection time a battery module provided with; and
a data processing unit electrically connected to the plurality of gas sensor units, receiving the gas detection time measured from each gas sensor unit, and predicting a damaged battery cell among the plurality of battery cells by comparing the received gas detection time with each other; Performance evaluation device of the battery module comprising a.
9. The method of claim 8,
The battery module has a structure in which a first gas discharge unit and a second gas discharge unit are formed on the side of the module case,
The apparatus for evaluating the performance of a battery module having a structure in which first and second gas sensor units are respectively disposed in the first gas discharge unit and the second gas discharge unit.
10. The method of claim 9,
The first gas outlet is a structure formed on the first side of the battery module,
The performance evaluation apparatus of the battery module having a structure formed in the second side of the second gas discharge unit opposite to the first side.
9. The method of claim 8,
The performance evaluation device of the battery module further comprising an insulation resistance sensor located on the inner surface of the module case, measuring the insulation resistance of the battery module and transmitting the measured insulation resistance value to an electrically connected data processing unit.
In the performance evaluation method of a battery module using the performance evaluation device according to claim 8,
Mounting a battery module in which a plurality of battery cells are accommodated in the module case in a chamber;
generating gas inside the battery module by adjusting the internal temperature of the chamber in which the battery module is mounted to 60 to 100°C;
measuring the gas detection time by detecting gas generated inside the battery module with a plurality of gas sensor units provided in the battery module; and
Comparing the result values measured from each gas sensor unit, predicting a damaged battery cell among a plurality of battery cells; Performance evaluation method of a battery module comprising a.
13. The method of claim 12,
The step of generating gas inside the battery module is a performance evaluation method of the battery module performed for 6 to 12 days at a temperature of 70 to 90 ℃.
13. The method of claim 12,
A method for evaluating the performance of a battery module in which the plurality of gas sensor units further measure at least one selected from the group consisting of a gas type and a gas concentration value when measuring a gas detection time.
13. The method of claim 12,
Predicting the damaged battery cell is a performance evaluation method of the battery module further comprising the step of determining whether the electrolyte leakage by measuring the insulation resistance inside the battery module.

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