KR20210036904A - A System for Changing and Discharging a Battery Cell of an Electrical Vehicle and a Method for the Same - Google Patents

Abstract

The present invention relates to a battery cell charging and discharging system for a vehicle and a method thereof. According to the present invention, the battery cell charging and discharging system for a vehicle comprises: a cell detection information unit (111) which stores information on a battery cell detected in a battery management system (BMS); a cell charging/discharging module (13) for discharging and charging a battery cell coupled to a battery module or a battery cell separated from the battery module; and a charge/discharge setting unit (131) which sets discharging or charging conditions of the cell charging/discharging module (13) based on the information about the battery cell transmitted from the cell detection information unit (111).

Description

A System for Changing and Discharging a Battery Cell of an Electrical Vehicle and a Method for the Same}

The present invention relates to a vehicle battery cell charging and discharging system and method thereof, and more particularly, to a vehicle battery cell charging and discharging system and method for charging and discharging a battery cell separated from a battery module.

A battery module for an electric vehicle has a structure in which a plurality of cells are electrically connected to each other, and the state of the battery cells is managed by a battery management system (BMS). BMS monitors the status of each cell and battery modules and battery packs formed by multiple cells, detects and transmits status information while protecting the battery cells, and maintains a charge or discharge balance between different battery cells. It can have a function to do. When an abnormal state is detected in the battery pack, battery module, or battery cell according to the detection information of the BMS, the battery cell is disconnected from the battery module and the state is detected, and the battery cell needs to be discharged or charged as necessary. Discharge or charging of the battery cells needs to be performed due to various causes, and discharge and charging of the battery cells need to be performed in a manner that does not affect the life of the battery cells. Various technologies related to battery modules or charging are known in this field. For example, Patent Publication No. 10-2011-011402 is an electric vehicle for controlling charging and discharging of a battery by using the state of charge information transmitted from the BMS of an electric vehicle. Disclosed is a method of charging and discharging a battery in a vehicle. In addition, Patent Publication No. 10-2017-0132078 discloses a system for determining a discharge power limit value and a charging power limit value of a battery cell. Prior art or known technology discloses charging of a battery pack mounted in an electric vehicle, but does not disclose a system capable of stably charging or discharging battery cells forming a battery pack.

The present invention has the following objects to solve the problems of the prior art.

Prior Art 1: Patent Publication No. 10-2011-0114024 (Korea Electric Power Corporation, published on Oct 19, 2011) Battery charging and discharging method of electric vehicle Prior Art 2: Patent Publication No. 10-2017-0132078 (LG Chemical Co., Ltd., published on December 1, 2017) System for determining the discharge power limit value and the charging power limit value of a battery cell

An object of the present invention is to provide a battery cell charging and discharging system for a vehicle and a method for stably discharging and charging a battery cell of a battery module or a battery cell to be separated from the battery module.

According to a preferred embodiment of the present invention, a system for charging and discharging a battery cell for a vehicle includes a cell detection information unit for storing information on a battery cell detected by the battery management system; A cell charging/discharging module for discharging and charging a battery cell coupled to the battery module or a battery cell separated from the battery module; And a charging/discharging setting unit for setting a discharge or charging condition of the cell charging/discharging module based on the information on the battery cell transmitted from the cell detection information unit.

According to another suitable embodiment of the present invention, a target value for the final state of discharging or charging is set in advance, and whether or not the target value is reached is determined by a fluctuation range at the predetermined value.

According to another preferred embodiment of the present invention, a method of charging and discharging a battery cell for a vehicle includes the steps of detecting a state of the battery cell; Setting voltage and current conditions for discharging or charging; Setting a precise target voltage value or current value; Adjusting the voltage or current so that the target value set during the discharging or charging process is stabilized; And storing information on the state of the discharged or charged battery cell.

According to another suitable embodiment of the present invention, the information on the state of the battery cell includes an estimated State Of Health (SOH) of the battery cell.

The battery cell charging and discharging system for a vehicle according to the present invention enables stably discharging or charging of a battery cell based on separation of a battery module, detection information of a battery management system (BMS), or information on a battery cell. The charging and discharging system according to the present invention discharges or discharges the battery cells while preventing damage to the battery cells by discharging or charging the battery cells based on information on the battery cells transmitted from the BMS or information detected during the charging or discharging process of the battery cells. Or let the charging take place. The method of discharging and charging a battery cell for an electric vehicle according to the present invention may be advantageously applied to a lithium ion battery cell, but is not limited thereto.

1 shows an embodiment of a vehicle battery cell charging and discharging system according to the present invention.
2 shows an embodiment of a method of charging and discharging a battery cell for a vehicle according to the present invention.
3 shows an embodiment of the operation structure of the charging and discharging system according to the present invention.
4 shows an embodiment of a charging process over time by the charging and discharging system according to the present invention.
5A and 5B illustrate an embodiment of a battery module disassembly apparatus applicable to a charging and discharging system according to the present invention.

In the following, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the embodiments are for a clear understanding of the present invention, and the present invention is not limited thereto. In the following description, components having the same reference numerals in different drawings have similar functions, so if they are not necessary for the understanding of the invention, they will not be described repeatedly, and well-known components will be briefly described or omitted, but the present invention It should not be understood as being excluded from the embodiment of.

1 shows an embodiment of a vehicle battery cell charging and discharging system according to the present invention.

Referring to FIG. 1, a system for charging and discharging a battery cell for a vehicle includes a cell detection information unit 111 that stores information on a battery cell detected by a battery management system (BMS); A cell charging/discharging module 13 for discharging and charging a battery cell coupled to the battery module or a battery cell separated from the battery module; And a charge/discharge setting unit 131 that sets a discharge or charge condition of the cell charge/discharge module 13 based on the information on the battery cell transmitted from the cell detection information unit 111.

The battery module may be a battery module for an electric vehicle, and a plurality of battery cells forming the battery module may be a lithium ion battery, but the present invention is not limited thereto. The battery management system EMS may detect and store information on a battery pack, a battery module, or a battery cell, and the stored information may be transmitted to the cell detection information unit 111. The cell detection information unit 111 may be installed in the cell charging/discharging module 13 or in various electronic devices capable of data communication with the cell charging/discharging module 13. The cell detection information unit 111 may or may not include information on each cell, and may include information on a battery pack or a battery module. The cell detection information unit 111 may assign and store a unique code for each battery cell regardless of whether information on each cell is included. The battery module may be separated from the electric vehicle for discharging or charging the battery cell, and the battery module may be separated by a separation jig 11 for separating the battery module. When the battery module is separated from the electric vehicle, the state of each battery cell can be checked, and a battery cell to be replaced can be determined if necessary. Accordingly, at least one battery cell may be separated by the cell separation module 12 for separating the battery cells for separating the battery cells. The battery cells may be discharged before or after the battery cells to be replaced are separated. Alternatively, the battery cells may be discharged to balance voltages between different battery cells. Thereafter, a battery cell that has been selectively discharged may be charged, and the discharge or charging of the battery cell may be performed in the cell charging/discharging module 13. The cell charging/discharging module may be a battery module or a cradle structure in which a battery pack may be accommodated or mounted, and may include a control module capable of controlling a charging or discharging process. In addition, it may include a charging/discharging setting unit 131 capable of setting discharge or charging conditions. The charging/discharging setting unit 131 may identify each battery cell according to a unique code of a battery cell to be transmitted from the cell detection information unit 111. In addition, the state of each battery cell may be detected based on the information on the battery module or the battery cell transmitted from the cell detection information unit 111. In addition, the charging/discharging setting unit 131 may set a discharge or charging condition of each battery cell based on the transmitted information and the detection information. Discharge or charge conditions may include, for example, discharge or charge voltage, power density, temperature, discharge or charge time, and may include a precise target value. The precise target value may be a tolerance range for a specified charge value for a state of charge of, for example, 20%. The precision target value may be, for example, a precision target voltage, and an error range of -0.1 to +0 in the process of discharging or charging. It may be 1%, and may be set to be ±0.1 V with respect to a predetermined target voltage value. Discharge or charging of the battery cells may be performed in a state in which the battery cells are disposed in the module or separated from the module.

2 shows an embodiment of a method of charging and discharging a battery cell for a vehicle according to the present invention.

Referring to FIG. 2, a method of charging and discharging a battery cell for a vehicle includes detecting a state of the battery cell (P21); Setting voltage and current conditions for discharging or charging (P22); Setting a precise target voltage value or current value (P23); Adjusting the voltage or current so that the target value set during the discharging or charging process is stabilized (P24); And storing information on the state of the discharged or charged battery cell (P25).

A battery cell disposed in the battery module or a battery cell separated from the battery module may be identified by a unique code assigned to the battery cell. In addition, the state of the identified battery cell may be detected (P21). The state of the battery cell may be detected by information transmitted from the cell detection information unit 111 and a detection unit disposed in the cell charging/discharging module. The cell state may include a charge level of a battery cell, a resistance of a battery cell, a type of a battery cell, or the number of times the battery cell is charged/discharged, and a state of the battery cell may be detected during a discharge or charging process. For example, during the charging or discharging process, a change in discharge or charging power density or temperature according to time, a change in resistance, or a change in a charging delay time may be detected (P21). When the state of the battery cell is detected in this way, a voltage or current for discharging or charging may be set (P22). For example, the discharge or charging voltage of the battery cell may be set to 3.0 to 4.5 V, the discharge current may be set to 30 to 50 A, and the charging current may be set to 150 to 250 A. Under such charging conditions, a discharge or charging time is determined, and accordingly, a power density for discharging or charging may be set (P22). When the discharging or charging condition is set in this way (P22), the battery cell may be discharged or charged according to the set condition. A plurality of battery cells may be discharged or charged at the same time, or may be discharged or charged alternately, and discharge or charging conditions may be adjusted according to the state of charge of different battery cells. In addition, a precision target value may be set at a predetermined discharge level or charge level, and, for example, a precision target voltage may be set (P23). The precise target value refers to limiting the variation level of the resistance value or the variation level of the voltage value to a predetermined range at a predetermined discharge level or charge level. The precise target value may be set, for example, with a variation width of ±0.01 to 0.5% for a predetermined level of discharge or charge. Approaching a predetermined discharge level or charge level, the discharge or charge power density can be adjusted, along with a variation in resistance or voltage can be detected. The power density cannot be controlled to reach a precise target value at a given discharge level or charge level. If the battery cell does not reach a predetermined target value, such a state may be stored, the state of the battery cell may be precisely checked, or related information may be transmitted to the battery management system. Optionally, such battery cells can be replaced. When discharging or charging of the battery cell is completed according to a predetermined condition, a stabilization process may be performed (P24). For example, the stabilization process P24 may include a process of maintaining a predetermined resistance value under different temperature conditions while setting a temperature of a battery cell or a process of preventing leakage. Alternatively, the stabilization process P24 may include a process of testing whether a battery cell that has been discharged or charged has a predetermined condition. When the stabilization process P24 is completed, state data of the battery cell may be generated and stored, and state information of the battery cell may be transmitted to the BMS as necessary (P25). The state information of the battery cell includes information such as, for example, a heating state according to charging or discharging in each state of charge, a change in resistance, or a change in voltage at different charging states, or an optimal charging or power density at different charging levels. Can include. Charging or discharging of the battery cell may be performed in various ways and is not limited to the exemplary embodiments presented.

3 shows an embodiment of the operation structure of the charging and discharging system according to the present invention.

Referring to FIG. 3, the information on the state of the battery cell includes an estimated state of health (SOH) of the battery cell. The discharging process or charging process of the battery cell may be controlled by the control module 31, and the charging or discharging of the battery cell may be performed in the cell cradle 34. The cell cradle 34 may have a structure capable of discharging or charging by fixing a battery module or a battery cell, and may include an appropriate electrical or mechanical means for this. The cell characteristics set by the cell characteristic setting unit 32 for discharging or charging may be transmitted to the control module 31. The cell characteristic setting unit 32 may be connected to enable data communication with the BMS information unit 321 and the cell information unit 322. The BMS information unit 321 may receive information on a battery module or battery cell from the BMS, for example, receives and stores information from the cell detection information unit 111 described in FIG. 1, and stores each battery cell. The information on can be classified and transmitted to the cell characteristic setting unit 32. In addition, the cell information unit 322 may extract and store information on the battery cells from various information servers in which information related to each battery cell is stored. In addition, information on a battery cell to be discharged or charged may be extracted and transmitted to the cell characteristic setting unit 32. In this way, information necessary for discharging or charging the battery cells is transmitted to the EMS information unit 321 and the cell information unit 322 to the cell characteristic setting unit 32, and the cell characteristics are determined based on this to the control module 31. Can be transmitted. The control module 31 controls the operation of the voltage setting unit 331 and the current setting unit 332 to discharge or charge the battery cells fixed to the cell cradle 34 by adjusting the power density to be discharged or charged. I can. During the charging process of the battery cell, the state of the battery cell may be detected by the state detection unit 36. The state of the battery cell refers to whether a temperature change, resistance change, leakage current occurs, or similar electrical, physical or chemical characteristics of a battery cell during a temperature or discharge process. The state of the battery cell may also include the state of health (SOH) of the battery cell. SOH may be estimated by, for example, a change in temperature or resistance of a battery cell during a discharging or charging process. For example, the charging region is divided into a plurality of sections, and the slope of the temperature change or the resistance change in each temperature section may be estimated based on the change of the slope. Alternatively, the SOH may be estimated as a method of measuring a leakage current leaking into a branch circuit having a predetermined resistance value while being connected to a variable capacitor and a variable capacitor set to maintain the same voltage as the charging or discharging voltage. The SOH of the battery cell estimated in this way may be transmitted to the condition diagnosis unit 38 together with other detection information detected by the condition detection unit 36. The state loss unit 38 may diagnose the state of the battery cell, estimate the number of possible charging or discharge times, or the usable life span of the battery cell, and transmit the estimated battery cell state to the cell state data unit 39. The cell state data unit 39 may store the transmitted data and transmit it to the control module 31. In addition, the cell state data 39 may transmit information related to the battery cell to the BMS.

The charging or discharging state of a battery cell charged or discharged in the cell cradle 34 may be detected by the charging/discharging detection unit 35. For example, whether the battery cells are discharged or discharged may be detected according to a predetermined criterion by the charge/discharge detection unit 35. The charging/discharging detection unit 35 may store a graph of charging or discharging versus time according to the power density, and whether discharging or charging is appropriate may be detected based on this. For example, in the process of discharging or charging, the reference curve and the charging curve may be contrasted, and voltage or current may be adjusted if they are out of a predetermined error range. It can also stop charging and trigger an alarm when it reaches an out-of-error alert stage. In addition, temperature change, resistance change, or leakage current may be detected during the charging process, and an alarm may be generated when it is outside a predetermined error range. In addition, such information may be transmitted to the charging/discharging data unit 37, and the charging/discharging data may store charging or discharging characteristics in each charging or discharging section. In addition, information detected during the charging or discharging process may be transmitted to the control module 31. The control module 31 may adjust the operation of the voltage setting unit 331 or the current setting unit 332 according to the transmitted charging or discharging information. In addition, charging or discharging characteristic data generated by the charging/discharging data unit 37 may be transmitted to the cell state data unit 39 via the control module 31 and then transmitted to the BMS. The charging and discharging system can be operated in various ways and is not limited to the embodiments presented.

4 shows an embodiment of a charging process over time by the charging and discharging system according to the present invention.

Referring to FIG. 4, the time compared to the state of charge may be a shape in which the slope decreases with the passage of time when charging is performed at a constant power density. The level of charge may be predetermined and may be determined, for example, 90% or 95% of the maximum level of charge. In the charging process, when the time t1 reaches a level of 98 to 99% of the predetermined charging level, the power density may be adjusted and a fluctuation value may be detected. After the oscillation value interval (t2 to t3) has elapsed, a predetermined charging value may be reached, and thus may be stabilized. The smaller the oscillation range in the oscillation value interval (t2 to t3) is, the more advantageous the stability of the battery cell is. Therefore, the adjustment time t1 at which the power density is adjusted and the slope of the adjusted power density need to be appropriately selected. For example, by calculating the slope of the curve in a graph of time versus state of charge, and adjusting the power density step by step by dividing the section in which the slope is, for example, 5 to 1 degrees, the magnitude of the fluctuation value (FV) and the fluctuation time ( t2 to t3) can be reduced. By precisely controlling the target value at the predetermined charging or discharging level as described above, discharging or charging may be stably performed while charging or discharging of the battery cell is stably performed. Adjustment of the target value may be performed in various ways, and is not limited to the presented embodiment.

5A and 5B illustrate an embodiment of a battery module disassembly apparatus applicable to a charging and discharging system according to the present invention.

5A and 5B, the battery modules B1 and B2 formed by electrically or mechanically connecting a plurality of battery cells to each other are separated from each other by a battery module disassembling device to be transported for charging or discharging described above. I can. The disassembly device includes a jig body in which a pair of module fixing units 42a and 42b facing each other are disposed; And it includes a hanger module consisting of two hangers (50a, 50b) that are separated from each other and are respectively coupled to the battery module. The jig body may function to fix a plurality of battery modules, and the plurality of battery modules may be transferred to and fixed to the jig body from a vehicle or from a charging/discharging facility. The jig body may include a base frame F made of a plurality of horizontal members or vertical members, and a pair of supporter units 41 disposed above the base frame F to face each other. A pair of module fixing units 42a and 42b may be coupled to each of the supporter units 41 so as to face each other. Each of the module fixing units 42a and 42b may be disposed to face each other while having the same or similar structure. The module fixing units 42a and 42b may function to fix both ends of the plurality of battery modules B1 and B2 fixed to the jig body. For example, the module fixing units 42a and 42b may include a fixing unit 421 fixed to the supporter unit 41 facing each other; A moving shaft 422 rotatably coupled to the fixed unit 421; And a balance plate 423 coupled to one portion of the moving shaft 422. The fixing unit 421 may include a bearing or a support means for supporting the rotation of a shaft similar thereto, and the moving shaft 422 may be moved forward or backward while being rotated by one part supported by the fixing unit 121. have. A balance plate 423 extending in a direction perpendicular to the extending direction of the moving shaft 422 may be coupled to one portion of the moving shaft 422, and the moving shaft 422 penetrates the balance plate 423 Can be extended. In addition, pressing units 43a and 43b contacting one side of the battery module may be coupled to the end of the moving shaft 422. The moving shaft 422 may have a structure capable of selectively rotating while being able to move back and forth, and may contact the balance plate 423 and the pressing units 43a and 43b, respectively, by the movement of the moving shaft 422 . The pressing units 43a and 43b may have an appropriate structure in which pressure is applied to the battery module by contacting the side surface of the battery module, and may be, for example, in a plate shape. While the balance plate 423 and the pressing units 43a and 43b are in contact with the jig frame 45b and the battery module, the moving shaft 422 is moved forward, and the battery module is firmly maintained by the pressing units 43a and 43b. In this state, when the balance plate 423 and the pressing units 43a and 43b are rotated independently from the moving shaft 422 or rotated together with the moving shaft 422, the battery modules B1 and B2 ) Can be rotated. The module fixing units 42a and 42b may fix the battery module in various ways. A plurality of battery modules (B1, B2) may be fixed to the jig frame (45a, 45b) disposed above the jig body, the jig frame (45a, 45b) can be rotated by the rotation of the moving shaft (423). have. Rotation of the moving shaft 423 may be performed, for example, by rotating the handles 451 formed on the jig frames 45a and 45b. The jig frames 45a and 45b may have a rectangular rim shape as a whole, and may include a first jig frame 45a and a second jig frame 45b made of a pair of linear members facing each other. In the process of fixing the battery modules B1 and B2 by the module fixing units 42a, 42b and the pressing units 43a, 43b, the balance plate 423 is fixed to the second jig frame 45b, and the pressing unit ( 43a and 43b may be fixed while applying pressure to both sides of the battery modules B1 and B2. In this state, the battery modules B1 and B2 may be rotated by the moving shaft 422. The battery modules B1 and B2 may be moved by hangers 50a and 50b to be coupled to the jig body or separated from the jig body and moved to a predetermined location. Each of the hangers 50a and 50b may have a structure capable of being coupled or detached to each of the battery modules B1 and B2. When the two battery modules B1 and B2 are fixed to the jig body 10, the two hangers 50a and 50b may be coupled to be detachable from each other. Each of the hangers 50a and 50b may include first and second hanger frames 51 and 52 corresponding to a shape of a square frame or similar battery module shape; Fastening units 53_1 and 53_2 formed on the hanger frames 51 and 52; And hook units 54_1 to 54_L formed on the hanger frames 51 and 52 so that the battery modules B1 and B2 are separated or coupled to the hangers 50a and 50b to move from one position to another. The upper portion of the battery module can be inserted into the rectangular rim formed by the first and second hanger frames 51 and 52, and the hook units 54_1 to 54_L are coupled to the side surfaces of the battery modules B1 and B2. When the battery modules B1 and B2 are coupled to the hangers 50a and 50b, the hook-shaped fastening units 53_1 and 53_2 formed at opposite positions of the second hanger frame 52 are, for example, a crane. A coupling means, such as a hook of a transport device, can be combined to move the battery modules 50a and 50b together with the hangers 50a and 50b to a predetermined position, and the battery modules B1 and B2 are fixed at a predetermined position. Then, the hangers 50a and 50b can be separated from the battery module. The different hangers 50a and 50b can be combined or separated in a manner in which the corners of the hanger frames 51 and 52 are coupled to each other, thereby The hangers 50a and 50b may be moved simultaneously, or the hangers 50a and 50b may be separated from each other and moved independently.

The hook units 54_1 to 54_L include a vertical plate 542 and a hook 541 protruding from the vertical plate 542. Two or more battery modules B1 and B2 mounted on an electric vehicle or similar vehicle may be moved to a predetermined position by the hangers 50a and 50b. Different hangers 50a and 50b may be detachably coupled by a coupling connector 57 for coupling the first and second hanger frames 51 and 52 of the different hangers 50a and 50b. For example, the coupling connector 57 may have a T, L, or I shape and a plate shape to which a plurality of bolts or screws can be coupled. In addition, the first and second hangers 50a and 50b may be separated or coupled by the coupling connector 57 being separated or coupled to the first and second hanger frames 51 and 52. In addition, the size of the rim of each of the hangers 50a and 50b may be adjusted by the assembly connector 56 that couples the first and second hanger frames 51 and 52. The first and second hangers 50a and 50b coupled to each other may be coupled to the battery modules B1 and B2 to move and separate the coupled battery modules B1 and B2. A cooling pad CP having an inflow tab CP formed thereon may be coupled to the two battery modules B1 and B2. Each battery module (B1, B2) includes a module body (BD1, BD2) fixing a plurality of battery cells, and at least one handling handle (BH1, BH2) formed on the side of each module body (BD1, BD2). can do. The first and second hanger frames 51 and 52 may be composed of first and second sub-hanger frames 512a, 512b, 522a, 522b that are arranged vertically from each other, and the first and second sub-hanger frames 512a and 512b, Protective pads 511 and 521 may be disposed between 522a and 522b to prevent damage due to side contact of the modules BD1 and BD2. In addition, the first and second sub-hanger frames 512a, 512b, 522a, and 522b may be coupled to each other by a coupler 58. As the first and second hangers 50a and 50b are moved downward by the operation of the transport means coupled to the fastening units 53_1 to 53_K, the module body BD1, The upper part of BD2) can be inserted. Each of the fastening means 53_1 to 53_K may be coupled to the second hanger frame 52 by a fixing connector 55, and the handling handles BH1 and BH2 may be U-shaped in which a coupling space is formed. The hook units 54_1 to 54_M may be coupled to the outer surface of the first hanger frame 51, and the coupling position may be adjusted by the adjustment screw 542. In addition, each of the hook units 54_1 to 54_M is formed on a vertical plate 542 and a vertical plate 541 that are coupled to the first hanger frame 51 so that the position of one end can be adjusted by an adjustment screw 542. It may be made of a hook 541 that can be fastened to the handling handles (BH1, BH2). The hangers 50a and 50b can be moved downward so that the vertical plate 342 is moved between the two handling handles BH1 and BH2, and after the hangers 50a and 50b are moved in the horizontal direction, When moved, the hook 541 may be caught by the handling handles BH1 and BH2. Thereafter, when the fastening units 53_1 to 53_K are moved upward by the transportation means, the hangers 50a and 50b and the battery modules B1 and B2 are moved upward together, thereby being separated from the electric vehicle. The battery modules B1 and B2 separated in this way may be located on the jig body.

When the combined battery modules (B1, B2) are located on the body now, the battery modules (B1, B2) are fixed to the first and second jig frames (45a, 45b) by the operation of the module fixing units (42a, 42b). Can be. Specifically, according to the movement of the moving shaft 422, the balance plate 423 and the pressing unit 43a contact the side surfaces of the jig frame 45b and the battery modules B1 and B2, respectively, and apply pressure while applying pressure to the battery module B1. , B2) may be fixed to the jig frames 45a and 45b. Thereafter, the battery modules B1 and B2 may be rotated by the rotation of the handle 451. When the battery modules B1 and B2 are rotated in the jig body, the cooling pad CP may be separated from the battery modules B1 and B2. The first and second battery modules B1 and B2 may be separated from the jig frames 45a and 45b and transferred to, for example, a battery charging or discharging device. In order to separate the battery modules B1 and B2, the pressurized state of the module fixing units 42a and 42b may be released, and the combined state of the first and second hangers 50a and 50b may be released. When the coupling connector is separated from the first and second jig frames 45a and 45b, the first and second hangers 50a and 50b may be separated from each other. Thereafter, the fastening units 53_1 and 53_2 are coupled to the transportation means, and the first hanger 50a may be moved to a predetermined position together with the first battery module B1 by the operation of the transportation means. In addition, when the first battery module B1 is moved to the predetermined position, the second battery module B2 may be moved to the predetermined position by the movement of the second hanger 50b again. In addition, when the necessary processes for the first and second battery modules B1 and B2 are completed, the first and second battery modules B1 and B2 may be moved to the jig body again. The battery modules B1 and B2 may be separated in various ways and transferred to the cell cradle described above, and are not limited to the presented embodiment.

The battery cell charging and discharging system for a vehicle according to the present invention enables stably discharging or charging of a battery cell based on separation of a battery module, detection information of a battery management system (BMS), or information on a battery cell. The charging and discharging system according to the present invention discharges or discharges the battery cells while preventing damage to the battery cells by discharging or charging the battery cells based on information on the battery cells transmitted from the BMS or information detected during the charging or discharging process of the battery cells. Or let the charging take place. The method of discharging and charging a battery cell for an electric vehicle according to the present invention may be advantageously applied to a lithium ion battery cell, but is not limited thereto.

The present invention has been described in detail above with reference to the presented embodiments, but those of ordinary skill in this field will be able to make various modifications and modifications without departing from the technical spirit of the present invention with reference to the presented embodiments. . The present invention is not limited by such modifications and modifications, but is limited by the claims appended below.

11: Separation jig 12: Cell separation module
13: Cell charging/discharging module 31: Control module
32: cell characteristic setting unit 34: cell cradle
35: charge/discharge detection unit 36: state detection unit
37: charge/discharge data unit 39: cell state data unit
111: cell detection information unit 131: charge/discharge setting unit
321: BMS information unit 322: cell information unit
331: voltage setting unit 332: current setting unit

Claims (2)

A cell detection information unit 111 that stores information on battery cells detected by a battery management system (BMS);
A cell charging/discharging module 13 for discharging and charging a battery cell coupled to the battery module or a battery cell separated from the battery module; And
A charging/discharging setting unit 131 for setting a discharge or charging condition of the cell charging/discharging module 13 based on the information on the battery cell transmitted from the cell detection information unit 111,
The cell detection information unit 111 stores information on the battery cells by giving a unique code for each battery cell, and the charge/discharge setting unit 131 Each battery cell is identified according to a unique code, and leakage current leaked into a branch circuit having a predetermined resistance value while connected to a variable capacitor and a variable capacitor set to maintain the same voltage as the charging voltage or the discharge voltage during the discharge or charging process Battery cell charging and discharging system for a vehicle, characterized in that the SOH of the battery is detected by measuring. The charging and discharging of a battery cell for a vehicle according to claim 1, wherein a target value for a final state of discharging or charging is set in advance, and whether the target value is reached is determined by a fluctuation range from a predetermined value. system.

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