Battery pack for controlling charging or discharging, and controlling method thereof

Abstract

The present invention relates to a battery pack for controlling charging or discharging, and a controlling method thereof, the charging / discharging control allowing charging current between battery packs to be consumed to protect the battery packs, thereby solving an impedance difference between battery packs, which occurs when the battery packs are connected in parallel in a low-temperature or high-temperature environment.

Description

Battery pack for charge / discharge control and control method thereof

[0001] The present invention relates to a battery pack, and more particularly, to a battery pack and a control method thereof that effectively resolve an imbalance between battery packs that occurs when connected in parallel in a low or high temperature environment outside the normal operating temperature range of a battery, thereby minimizing energy consumption.

[0002] Recently, interest in electrical products powered by electric energy has been growing. Consequently, technological development and demand for mobile devices, electric vehicles, hybrid vehicles, power storage devices, and uninterruptible power supplies (UPS) are increasing, and demand for secondary batteries as an energy source is rapidly increasing.

[0003] These secondary batteries are configured as battery packs by connecting multiple cell assemblies, each consisting of a group of unit cells, in series or parallel to provide high output or large power. This ensures the desired output or power is supplied. High-performance electric vehicles, which require high capacity, utilize multiple battery packs connected in parallel.

[0004] When battery packs are connected in parallel and used, a voltage difference occurs between the battery packs even when the battery packs are fully charged due to the difference in impedance of each battery pack. And due to this voltage difference, a charging current flows from a battery pack with a higher voltage to a battery pack with a lower voltage. For example, when a first battery pack having a charging voltage of 57.08 [V] and a resistance of 0.024 [Ω] and a second battery pack having a charging voltage of 57.05 [V] and a resistance of 0.026 [Ω] are connected in parallel, a charging current of 600 [mA] occurs from the second battery pack to the first battery pack.

[0005] However, especially in abnormal temperatures where charging is not performed properly, such as low temperatures below 0°C or high temperatures above 55°C, the charging voltage of the battery packs may change significantly, resulting in a greater difference in charging voltage between battery packs. In other words, in abnormal temperature environments, the charging current applied between battery packs connected in parallel may become greater.

[0006] When connecting battery packs, the charging current from another battery pack can damage the battery cells that make up the battery pack. Specifically, battery cells have a predetermined cell power specification (PS). Accordingly, if a charging current exceeding the PS is applied to a low-voltage battery cell, damage to the battery cell may occur. Furthermore, even if the PS is the same for battery cells, the charge / discharge temperature range varies for each battery cell. Therefore, charging at low or high temperatures outside the normal charging range can result in even greater damage to the battery cells.

[0007] Related prior art includes the following:

[0008] (Patent Document 1) Korean Patent Publication No. 10-2010-0005104 (Published on January 13, 2010)

[0009] (Patent Document 2) Korean Patent Publication No. 10-2020-0041706 (Published on April 22, 2020)

[0010]

[0011] The present invention aims to provide a battery pack and a control method thereof for charge and discharge control that consumes charging current between battery packs to protect the battery pack and eliminates the impedance difference between battery packs that occurs when connected in parallel in a low or high temperature environment.

[0012] The present invention provides a battery pack and a control method thereof for controlling charge and discharge so as to prevent damage to battery cells by configuring a charge and discharge device that consumes the charge current generated when connecting battery packs in parallel at low or high temperatures. In addition, the present invention provides a battery pack and a control method thereof for controlling charge and discharge so as to store the charge current consumed by the charge and discharge device and then charge the battery pack when conditions (room temperature) allow charging.

[0013] A battery pack for charge and discharge control according to an embodiment of the present invention includes a cell assembly having a plurality of battery cells and electrically connected to pack input / output terminals (a+, a-) through a first charge / discharge path (c), a first charge / discharge switch configured between the cell assembly and the pack input / output terminal (a+) to connect or disconnect the first charge / discharge path (c) depending on an operating state of turn-on or turn-off, a second charge / discharge switch configured between the first charge / discharge switch and the pack input / output terminal (a+) and the pack input / output terminal (a-) to connect or disconnect the second charge / discharge path (d) depending on an operating state of turn-on or turn-off, a charge / discharge unit configured between the second charge / discharge switch and the pack input / output terminal (a-) to consume a charging current applied between battery packs connected in parallel, and a control unit that controls the operating states of the first and second charge / discharge switches to turn-on or turn-off.

[0014] The above first charge / discharge switch is turned off when the temperature of the battery pack is in an abnormal temperature environment where charging problems occur, thereby blocking the first charge / discharge path (c), and is turned on when the temperature of the battery pack is in a normal temperature environment other than the abnormal temperature, thereby connecting the first charge / discharge path (c).

[0015] The second charge / discharge switch is turned on when the temperature of the battery pack is in an abnormal temperature environment where charging problems occur, thereby connecting the second charge / discharge path (d), and is turned off when the temperature of the battery pack is in a normal temperature environment other than the abnormal temperature, thereby blocking the second charge / discharge path (d).

[0016] The above charging / discharging unit charges the battery pack with a current applied from the first charging / discharging path (c) in an abnormal temperature environment where the temperature of the battery pack causes a problem in charging, and discharges the charge charged inside the battery pack and applies the current to the first charging / discharging path (c) in a normal temperature environment other than the abnormal temperature.

[0017] The above control unit controls the first charge / discharge switch to be turned off and the second charge / discharge switch to be turned on when the temperature of the battery pack is in an abnormal temperature environment where charging problems occur, and controls the first charge / discharge switch to be turned on and the second charge / discharge switch to be turned off when the temperature of the battery pack is in a normal temperature environment other than the abnormal temperature.

[0018] The above control unit, when a battery pack is connected, checks whether the battery pack is connected and the voltage of the battery pack through CAN communication and compares the voltages between the connected battery packs.

[0019] The above control unit measures the voltage of the charging / discharging unit to check the charge / discharge status of the charging / discharging unit.

[0020] The above control unit controls the operation state of the second charge / discharge switch to be turned on while the charge charged in the charge / discharge unit is discharged, and controls the operation state of the second charge / discharge switch to be turned off when the charge charged in the charge / discharge unit is completely discharged.

[0021] The above pack input / output terminals (a+, a-) are electrically connected to the pack input / output terminals (b+, b-) of another battery pack mounted in the battery system (S) and the system input / output terminals (P+, P-) of the battery system (S), respectively.

[0022] The above abnormal temperature is a low temperature below 0℃ or a high temperature above 45℃ or 55℃, and the above normal temperature range can be between 0℃ and 55℃ or between 0℃ and 45℃.

[0023] A method for controlling charging and discharging of a battery pack according to an embodiment of the present invention comprises: (A) a step of detecting in a control unit whether a first battery pack is electrically connected in parallel with another second battery pack through CAN communication, and checking the voltage of the first battery pack connected in parallel; (B) a step of connecting a first charge and discharge path (c) for charging and discharging battery cells when the voltage of the first battery pack is lower than the voltage of the second battery pack and the temperature of the first battery pack is within a normal temperature range in which there is no problem with charging; (C) a step of blocking the first charge and discharge path (c) when the voltage of the first battery pack is lower than the voltage of the second battery pack and the temperature of the first battery pack is within an abnormal temperature range in which there is a problem with charging; (D) a step of connecting a second charge and discharge path (d) for consuming a charging current applied from the second battery pack (200); and (E) a step of consuming a charging current applied to the second charge and discharge path (d) in a charge and discharge unit. Includes.

[0024] The above step (B) further includes a step of blocking a second charge / discharge path (d) that consumes the charging current applied from the second battery pack.

[0025] The above step (B) includes a step of controlling, in the control unit, the operation state of the first charge / discharge switch configured in the first battery pack to be turned on, thereby connecting the first charge / discharge path (c), and a step of controlling, in the control unit, the operation state of the second charge / discharge switch configured in the first battery pack to be turned off, thereby blocking the second charge / discharge path (d).

[0026] The above step (C) includes a step of controlling, in the control unit, the operation state of the first charge / discharge switch configured in the first battery pack to be turned off, thereby blocking the first charge / discharge path (c).

[0027] The above step (D) includes a step of connecting the second charge / discharge path (d) by controlling the operation state of the second charge / discharge switch configured in the first battery pack to be turned on in the control unit.

[0028] The above step (E) includes a step of (E1) charging a charge to a charging / discharging unit by a charging current applied to the second charging / discharging path (d), and a step of (E2) connecting the first charging / discharging path (c) and the second charging / discharging path (d) so that a charging current is applied to the first charging / discharging path (C) when the temperature of the first battery pack is within the normal temperature range after the charge is charged to the charging / discharging unit.

[0029] The above step (E2) includes a step of measuring the voltage of the charging / discharging unit in the control unit to determine whether the charging / discharging unit is charged, and a step of controlling the operation state of the first charging / discharging switch to turn on in the control unit to connect the first charging / discharging path (c) if the determination result shows that the charging / discharging unit is charged.

[0030] The above step (E2) further includes a step of measuring the voltage of the charging / discharging unit in the control unit to determine whether charges have been discharged in the charging / discharging unit, a step of controlling the operation state of the second charging / discharging switch to be turned on in the control unit when the charges charged in the charging / discharging unit are not all discharged as a result of the determination, and a step of connecting the second charging / discharging path (d) by controlling the operation state of the second charging / discharging switch to be turned off in the control unit when the charges charged in the charging / discharging unit are all discharged as a result of the determination.

[0031]

[0032] According to an embodiment of the present invention, the charging current between battery packs is consumed to protect the battery packs, thereby resolving problems caused by charging between battery packs when connected in parallel in low or high temperature environments (environments where charging is not permitted). In particular, the safety of the battery pack can be enhanced by designing the battery packs so that damage to the battery cells is not caused even when connected in an abnormal temperature environment.

[0033] In addition, by configuring a charging / discharging device that consumes the charging current generated when connecting battery packs in parallel, and storing the charging current consumed by the charging / discharging device and then charging the battery pack when conditions allow charging, energy consumption can be minimized.

[0034] Figure 1 is a drawing showing the configuration of a battery pack for charge / discharge control according to an embodiment of the present invention.

[0035] Figure 2 is a drawing showing in detail the internal configuration of the battery pack of Figure 1.

[0036] Figure 3 is a flowchart for explaining a method for controlling charging and discharging of a battery pack according to an embodiment of the present invention.

[0037] Figure 4 is a flowchart for explaining a method of consuming charging current in Figure 3.

[0038] Figure 5 is a flowchart for explaining step S300 of Figure 4 in detail.

[0039] Figure 6 is a flowchart for explaining step S400 of Figure 4 in detail.

[0040]

[0041] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments of the present invention are provided solely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. For the purpose of explaining the invention in detail, the drawings may be exaggerated, and like reference numerals throughout the drawings represent like elements.

[0042] FIG. 1 is a drawing showing the configuration of a parallel-connected battery pack according to an embodiment of the present invention, and FIG. 2 is a drawing showing the internal configuration of the battery pack of FIG. 1 in detail.

[0043] Referring to FIGS. 1 and 2, the battery system (S) may have multiple battery packs (100) (200) connected in parallel. That is, the battery system (S) of the present invention has multiple battery packs (100) (200) electrically connected in parallel, and may output power to a load through input / output terminals (P+, P-) of the battery system (S).

[0044] A plurality of battery packs (100) (200) may be detachably mounted on a battery system (S). When one of the plurality of battery packs (100) (200) is mounted on the battery system (S), it may be electrically connected in parallel with another battery pack (200) that is pre-mounted on the battery system (S). In this specification, the battery system (S) is described as having two battery packs (100) (200), but three or more battery packs may be mounted and connected in parallel with each other.

[0045] A battery pack (100) for charge / discharge control according to one embodiment of the present invention includes a cell assembly (110), a first charge / discharge switch (120), a second charge / discharge switch (130), a charge / discharge unit (140), and a control unit (150). In addition, the battery pack (100) for charge / discharge control further includes a first charge / discharge path (c), a second charge / discharge path (d), and pack input / output terminals (a+, a-).

[0046] The cell assembly (110) may include a plurality of battery cells. The cell assembly (110) may be electrically connected to the pack input / output terminals (a+, a-) via a first charge / discharge path (c). Accordingly, the cell assembly (110) may be charged / discharged by inputting or outputting current via the first charge / discharge path (c) while the first charge / discharge switch (120) located on the first charge / discharge path (c) is turned on. Conversely, the cell assembly (110) may be stopped from charging / discharging while the first charge / discharge switch (120) is turned off.

[0047] The first charge / discharge switch (120) may be composed of at least one FET (Field Effective Transistor). The first charge / discharge switch (120) is configured between the cell assembly (110) and the pack input / output terminal (a+), and connects (turns on) or blocks (turns off) the first charge / discharge path (c) depending on the operating state of turn-on or turn-off. As an example, the first charge / discharge switch (120) is turned off in an environment where the temperature of the battery pack (100) is an abnormal temperature in which charging should not be performed (e.g., a low temperature of 0°C or lower or a high temperature of 55°C or higher), and blocks the first charge / discharge path (c). Conversely, the first charge / discharge switch (120) is turned on in an environment where the temperature of the battery pack (100) is a normal temperature range other than the abnormal temperature (e.g., between 0°C and 55°C during charging, and between -20°C and 60°C during discharging), and connects the first charge / discharge path (c). The normal charge / discharge temperature range of a battery pack can be set according to the characteristics of the battery pack or the system characteristics. The abnormal temperature is a low temperature below 0°C or a high temperature above 45°C or 55°C, and the normal temperature range can be between 0°C and 55°C, or between 0°C and 45°C.

[0048] The second charge / discharge switch (130) may be composed of at least one FET and a resistor connected in series to the FET. The second charge / discharge switch (130) is configured between the first charge / discharge switch (130) on the first charge / discharge path (c) and the pack input / output terminal (a+) and between the pack input / output terminal (a-), and connects or disconnects the second charge / discharge path (d) depending on the operating state of turn-on or turn-off. As an example, the second charge / discharge switch (130) is turned on when the temperature of the battery pack (100) is in an abnormal temperature environment, thereby connecting the second charge / discharge path (d).

[0049] The charge / discharge unit (140) may be configured to include at least one capacitor. The charge / discharge unit (140) is configured between the second charge / discharge switch (130) on the second charge / discharge path (d) and the pack input / output terminal (a-), and stores the charging current applied between the battery packs (100) (200) connected in parallel. When the temperature of the battery pack (100) is in an abnormal temperature environment, the control unit (150) opens the first charge / discharge switch (120) and closes the second charge / discharge switch (130), thereby charging the charge by the current applied to the first charge / discharge path (c) to the charge / discharge unit (140).

[0050] When connected to another battery pack (200), the control unit (150) can check the connection with another battery pack (200) and the voltage of the battery packs (100, 200) through CAN communication to compare the voltages between the battery packs connected in parallel. The control unit (150) can measure the voltage of the charging / discharging unit (140), and if it is confirmed that the charging / discharging unit (140) is charged, or if the charging / discharging unit (140) is no longer charged, open the second charging / discharging switch (130) to stop charging to the charging / discharging unit (140).

[0051]

[0052] When the temperature of the battery pack (100) becomes a normal temperature environment, the control unit (150) reconnects the first charge / discharge switch (120) and the second charge / discharge switch (130) to discharge the charge stored in the charge / discharge unit (140) and apply current to the first charge / discharge path (c), and charges the cell assembly (110) using the energy stored in the charge / discharge unit (140).

[0053] In this way, in an environment where the battery cell should not be charged, the charging / discharging unit (140) consumes the charging current from another battery pack (200) connected in parallel to the charging / discharging unit (140), thereby enhancing the safety of the battery pack (100), and in a normal temperature range, the charging current stored in the charging / discharging unit (140) is charged to the cell assembly (110) of the battery pack (100), thereby preventing unnecessary charging between packs and enabling efficient energy use.

[0054] The control unit (150) may be a processor of a battery management system (not shown) and may be configured with a component such as an MCU (Micro Control Unit). The control unit (150) may control the operation states of the first and second charge / discharge switches (120) (130) to be turned on or off. As an example, when the temperature of the battery pack (100) is abnormal, the control unit (150) controls the first charge / discharge switch (120) to be turned off to block the first charge / discharge path (c), and controls the second charge / discharge switch (130) to be turned on to connect the second charge / discharge path (d). After the charge / discharge unit (140) is sufficiently charged, the second charge / discharge path (d) is blocked. The control unit (150) controls the first charge / discharge switch (120) to turn on when the temperature of the battery pack (100) is in a normal temperature environment, thereby connecting the first charge / discharge path (c) so that the charge current from another battery pack (200) charges the cell assembly (110).

[0055] At this time, by turning on the second charge / discharge switch (130) and connecting the second charge / discharge path (d), the charge current from the charge / discharge unit (140) can be charged to the cell assembly (110) through the second charge / discharge path (d) and the first charge / discharge path (c).

[0056] The operation state of the second charge / discharge switch (130) is controlled to be turned on while the charge charged in the charge / discharge unit (140) is discharged. As the charge charged in the charge / discharge unit (140) is discharged, current is applied to the first charge / discharge path (c). Then, the control unit (150) measures the voltage of the charge / discharge unit (140), and when it is confirmed that all of the charged charge in the charge / discharge unit (140) has been discharged, the operation state of the second charge / discharge switch (130) is controlled to be turned off, thereby blocking the second charge / discharge path (d).

[0057] The pack input / output terminals (a+, a-) can be electrically connected to the pack input / output terminals (b+, b-) of another battery pack (200) mounted on the battery system (S) and the system input / output terminals (P+, P-) of the battery system (S), respectively.

[0058] Meanwhile, the control of the operating states of the first and second charge / discharge switches (120)(130) is described to be divided into abnormal temperature and normal temperature, but this is only one condition used and is not limited thereto, as the maximum charging voltage of the battery cell is greatly affected by the temperature due to the characteristics of the battery cell. That is, various conditions may be used depending on the overcharge occurrence condition of the battery cell using the PS (power specification) of the battery cell. However, in this specification, for the sake of clear and concise explanation, the conditions are limited to abnormal temperature and normal temperature and described.

[0059]

[0060] Hereinafter, a method for controlling charging and discharging of a battery pack according to an embodiment of the present invention will be described. The method for controlling charging and discharging of a battery pack according to an embodiment of the present invention may be a method for processing a signal received using the battery pack for charge and discharge control described above. Accordingly, the above-described content regarding the battery pack for charge and discharge control can be applied as is, and thus, a description of redundant content may be omitted.

[0061] Figure 3 is a flowchart for explaining a method for controlling charging and discharging of a battery pack according to an embodiment of the present invention.

[0062] Referring to FIG. 3, a method for controlling charging and discharging of a battery pack according to an embodiment of the present invention detects, in a control unit (150), whether a first battery pack (100) is electrically connected in parallel with another second battery pack (200) through CAN communication, and checks the voltage of the first battery pack connected in parallel and compares them with each other (S10).

[0063] As a result of the comparison (S10), if the voltage of the first battery pack (100) is lower than the voltage of the second battery pack (200) (S20) and the temperature of the first battery pack (100) is within a predetermined normal temperature range (S30), the control unit (150) controls the operation state of the first charge / discharge switch (120) configured in the first battery pack (100) to be turned on, thereby connecting the first charge / discharge path (c) for charging and discharging the battery cells (110) (S40). At this time, the normal temperature range is an appropriate temperature range in which charging is possible according to the standard set in the PS of the battery cell (110), and may be, for example, a range between 0°C and 55°C during charging.

[0064] In the appropriate temperature range, the control unit (150) controls the operation state of the second charge / discharge switch (130) configured in the first battery pack (100) to be turned off, thereby blocking the second charge / discharge path (d) that consumes the charging current applied from the second battery pack (200) (S50).

[0065] In addition, if the voltage of the first battery pack (100) is lower than the voltage of the second battery pack (200) as a result of the comparison (S10) (S20) and the temperature of the first battery pack (100) is within an abnormal temperature range (S30), the control unit (150) controls the operation state of the first charge / discharge switch (120) configured in the first battery pack (100) to be turned off, thereby blocking the first charge / discharge path (c) for charging and discharging the battery cells (110) (S60). At this time, the abnormal temperature range is a temperature range in which charging is not performed according to the standard set in the PS of the battery cell (110), and may preferably be a low temperature of 0°C or lower or a high temperature of 55°C or higher.

[0066] In such an abnormal temperature range, the control unit (150) controls the operation state of the second charge / discharge switch (130) configured in the first battery pack (100) to be turned on, thereby connecting the second charge / discharge path (d) that consumes the charging current applied from the second battery pack (200) (S70).

[0067] Figure 4 is a flowchart for explaining a method of consuming charging current in Figure 3.

[0068] Referring to Fig. 4, a charge is charged to the charging / discharging unit (140) by a charging current applied to the second charging / discharging path (d) (S100). When the charging / discharging unit (140) is sufficiently charged, the second charging / discharging path (d) is blocked to stop charging.

[0069] After the charge is charged in the charging / discharging unit (140), when the temperature of the first battery pack (100) enters the normal temperature range (S200), the control unit (150) controls the operation state of the first charging / discharging switch (120) to be turned on, thereby connecting the first charging / discharging path (c) for charging / discharging the battery cells (110) (S300), and at the same time, controls the operation state of the second charging / discharging switch (130) to be turned on, thereby connecting the second charging / discharging path (d) so that the charging current from the charging / discharging unit (140) is applied to the first charging / discharging path (c) (S400).

[0070] In this way, as both the first charge / discharge path (c) and the second charge / discharge path (d) are connected, the charge charged in the charge / discharge unit (140) is discharged and the charging current is applied to the first charge / discharge path (c), so that the charging current applied from the second battery pack (200) is charged to the first battery pack (100).

[0071] Meanwhile, FIG. 5 is a flowchart for explaining step S300 of FIG. 4 in detail, wherein step S300 is performed by the control unit (150) by measuring the voltage of the charging / discharging unit (140) to determine whether the charging / discharging unit (140) is sufficiently charged (S310).

[0072] As a result of the judgment, if the charge / discharge unit (140) is sufficiently charged (S320), the control unit (150) controls the operation state of the second charge / discharge switch (130) to be turned on to connect the first charge / discharge path (c) (S330).

[0073] FIG. 6 is a flowchart for explaining step S400 of FIG. 4 in detail. In step S400, the control unit (150) measures the voltage of the charging / discharging unit (140) to determine whether charge has been discharged in the charging / discharging unit (140) (S410).

[0074] As a result of the judgment, if the charge charged in the charging / discharging unit (140) is not completely discharged (S420), the control unit (150) controls the operation state of the second charging / discharging switch (130) to be turned on, thereby maintaining the connection of the second charging / discharging path (d) (S430).

[0075] As a result of the judgment, if all the charges charged in the charging / discharging unit (140) are discharged (S420), the control unit (150) controls the operation state of the second charging / discharging switch (130) to be turned off, thereby blocking the second charging / discharging path (d) (S440).

[0076] In this way, the second charge / discharge path (d) is connected only when the charge is charged in the charge / discharge unit (140), and when all of the charged charges in the charge / discharge unit (140) are discharged, the second charge / discharge path (d) is blocked again.

[0077] Meanwhile, when a load is connected to the battery packs (100, 200) and the battery packs (100, 200) start to discharge, the control unit (150) blocks the charge / discharge path (d) so that only the current from the cell assembly flows to the load, thereby ensuring voltage stability to the load.

[0078]

[0079] While the preferred embodiments of the present invention have been described and illustrated using specific terms above, such terms are solely for the purpose of clearly describing the present invention, and it is to be understood that various modifications and variations may be made to the embodiments and terms described herein without departing from the spirit and scope of the appended claims. Such modified embodiments should not be construed individually from the spirit and scope of the present invention, but should be considered to fall within the scope of the claims.

[0080] The names of each symbol used in the specifications and drawings are as follows.

[0081] 100, 200: Battery pack 110: Cell assembly

[0082] 120: 1st charge / discharge switch 130: 2nd charge / discharge switch

[0083] 140: Charging and discharging section 150: Control section

[0084] S: Battery system c: First charge / discharge path

[0085] d: Second charge / discharge path

Claims

A cell assembly having multiple battery cells and electrically connected to the pack input / output terminals (a+, a-) through a first charge / discharge path (c), A first charge / discharge switch configured between the cell assembly and the pack input / output terminal (a+) to connect or disconnect the first charge / discharge path (c) depending on the operating state of turn-on or turn-off; A second charge / discharge switch configured between the first charge / discharge switch and the pack input / output terminal (a+) and the pack input / output terminal (a-), which connects or blocks the second charge / discharge path (d) depending on the operating state of turn-on or turn-off; A charging / discharging unit configured between the second charging / discharging switch and the pack input / output terminal (a-) to consume the charging current applied between battery packs connected in parallel; A battery pack including a control unit that controls the operation state of the first and second charge / discharge switches to turn on or turn off. In the first paragraph, The above first charge / discharge switch is, In an abnormal temperature environment where the temperature of the battery pack causes a problem in charging, it is turned off and the first charge / discharge path (c) is blocked. A battery pack that is turned on in a normal temperature environment other than the above-mentioned abnormal temperature and connects the first charge / discharge path (c). In the first paragraph, The above second charge / discharge switch is, A battery pack that is turned on and connects the second charge / discharge path (d) in an abnormal temperature environment where the temperature of the battery pack causes a problem in charging. In the first paragraph, The above charging and discharging part is, In an abnormal temperature environment where the temperature of the battery pack causes a problem in charging, the charge is charged by the current applied from the first charge / discharge path (c), A battery pack that discharges the charge stored inside the battery pack in a normal temperature environment other than the above-mentioned abnormal temperature and applies current to the first charge / discharge path (c). In the first paragraph, The above control unit, In an abnormal temperature environment where the temperature of the battery pack causes a problem in charging, the first charge / discharge switch is controlled to turn off, and the second charge / discharge switch is controlled to turn on. A battery pack in which the first charge / discharge switch is controlled to turn on in a normal temperature environment other than the above-mentioned abnormal temperature, and the second charge / discharge switch is controlled to turn on to charge the cell assembly. In the first paragraph, The above control unit is a battery pack that, when a battery pack is connected, checks whether the battery pack is connected and the voltage of the battery pack through CAN communication and compares the voltages between the connected battery packs. In the first paragraph, A battery pack in which the control unit measures the voltage of the charging / discharging unit and checks the state of charge charging and discharging of the charging / discharging unit. In paragraph 7, The above control unit, Controlling the operation state of the second charge / discharge switch to turn on while the charge charged in the above charge / discharge unit is discharged, A battery pack that controls the operation state of the second charge / discharge switch to turn off when all charges charged in the above charge / discharge unit are discharged. In the first paragraph, The above pack input / output terminals (a+, a-) are electrically connected to the pack input / output terminals (b+, b-) of another battery pack mounted in the battery system (S) and the system input / output terminals (P+, P-) of the battery system (S). In any one of paragraphs 2 to 5, A battery pack characterized in that the above abnormal temperature is a low temperature below 0℃ or a high temperature above 55℃, and the above normal temperature is a temperature between 0℃ and 55℃. (A) A step of detecting in the control unit whether the first battery pack is electrically connected in parallel with another second battery pack through CAN communication and checking the voltage of the first battery pack connected in parallel; (B) a step of connecting a first charge / discharge path (c) for charging and discharging battery cells when the voltage of the first battery pack is lower than the voltage of the second battery pack and the temperature of the first battery pack is within a normal temperature range in which there is no problem with charging; (C) a step of blocking the first charge / discharge path (c) when the voltage of the first battery pack is lower than the voltage of the second battery pack and the temperature of the first battery pack is within an abnormal temperature range that causes a problem in charging; (D) A step of connecting a second charging / discharging path (d) that consumes the charging current applied from the second battery pack (200), (E) A method for controlling charging and discharging of a battery pack, comprising a step of consuming a charging current applied to a second charging and discharging path (d) in a charging and discharging section. In paragraph 11, A method for controlling charging and discharging of a battery pack, wherein the step (B) further includes a step of blocking a second charging and discharging path (d) that consumes charging current applied from the second battery pack. In paragraph 12, Step (B) above, In the control unit, a step of controlling the operation state of the first charge / discharge switch configured in the first battery pack to turn on to connect the first charge / discharge path (c), A method for controlling charging and discharging of a battery pack, comprising a step of controlling the operation state of a second charging and discharging switch configured in the first battery pack to be turned off, thereby blocking the second charging and discharging path (d). In paragraph 11, The above step (C) is a method for controlling charging and discharging of a battery pack, including a step of controlling the operation state of the first charging and discharging switch configured in the first battery pack to be turned off, thereby blocking the first charging and discharging path (c). In paragraph 11, Step (D) above, A method for controlling charging and discharging of a battery pack, comprising a step of controlling the operation state of a second charging and discharging switch configured in the first battery pack to be turned on, thereby connecting the second charging and discharging path (d). In paragraph 11, The above step (E) is, (E1) A step of charging a charge to a charging / discharging unit by a charging current applied to the second charging / discharging path (d), (E2) A method for controlling charging and discharging of a battery pack, comprising the step of connecting the first charging and discharging path (c) and the second charging and discharging path (d) so that current from the charging and discharging unit is applied to the first charging and discharging path (C) when the temperature of the first battery pack is within the normal temperature range after the charge is charged to the charging and discharging unit. In paragraph 16, The above step (E2) is, In the control unit, a step of measuring the voltage of the charging / discharging unit and determining that the charging / discharging unit is charged, A method for controlling charging and discharging of a battery pack, including a step of controlling the operation state of the first charging and discharging switch to turn on in the control unit when the charge is charged in the charging and discharging unit as a result of the above judgment, thereby connecting the first charging and discharging path (c). In paragraph 16, The above step (E2) is, In the control unit, a step of measuring the voltage of the charging / discharging unit and determining that charge has been discharged in the charging / discharging unit; As a result of the above judgment, if the charge charged in the charging / discharging section is not completely discharged, a step of controlling the operation state of the second charging / discharging switch to be turned on in the control section to connect the second charging / discharging path (d), A method for controlling charging and discharging of a battery pack, further comprising a step of controlling the operation state of the second charging and discharging switch to be turned off in the control unit when all of the charges charged in the charging and discharging unit are discharged as a result of the above judgment, thereby blocking the second charging and discharging path (d).

Images