KR20190143181A - Apparatus for self-discharging battery - Google Patents

Abstract

The present invention relates to an apparatus for self-discharging a battery which can effectively self-discharge a battery in a process of self-discharging batteries including one or more secondary batteries. According to an embodiment of the present invention, the apparatus for self-discharging a battery has a charging switch and a discharging switch connected in series to each other on a charging/discharging path for supplying a charging/discharging current to a cell assembly to self-discharge the cell array and comprises: a voltage measurement unit electrically connected to both ends of the cell assembly to measure a voltage of both ends of the cell assembly; a current measurement unit electrically connected to a current sensor arranged on the charging/discharging path to measure a charging/discharging current flowing through the charging/discharging path based on an electrical signal received from the current sensor; a temperature measurement unit adjacent to the cell assembly to measure a measurement temperature of the cell assembly; a self-discharging circuit wherein one end thereof is connected to the charging/discharging path and the other end thereof is connected to the ground to allow the self-discharging current of the cell assembly to flow; and a processor to receive a value of the voltage of both ends, a value of the charging/discharging current, and a value of the measurement temperature from the voltage measurement unit, the current measurement unit, and the temperature measurement unit, calculate a resistance value of the cell assembly based on the value of the voltage of both ends and the value of the charging/discharging current, and self-discharge the cell assembly through the self-discharging circuit based on the calculated resistance value and the value of the measurement temperature.

Description

Battery self-discharge device {Apparatus for self-discharging battery}

The present invention relates to a battery self-discharge device, and more particularly, to a battery self-discharge device that can effectively self-discharge a battery in the process of self-discharge a battery having at least one secondary battery.

Recently, as the demand for portable electronic products such as notebooks, video cameras, portable telephones, etc. is rapidly increased, and development of electric vehicles, energy storage batteries, robots, satellites, and the like is in earnest, high-performance secondary batteries capable of repeatedly charging and discharging are possible. There is an active research on.

Commercially available secondary batteries include nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries have almost no memory effect compared to nickel-based secondary batteries, and thus are free of charge and discharge. The self-discharge rate is very low and the energy density is high.

Batteries are used in various fields. In recent years, battery-intensive fields such as electric powered vehicles or smart grid systems often require large capacity. In order to increase the capacity of the battery pack, there may be a method of increasing the capacity of the secondary battery, that is, the battery cell itself. However, in this case, the capacity increase effect is not great, and there are physical limitations on the size expansion of the secondary battery and inconvenience of management. Has Thus, battery packs are typically widely used in which a plurality of battery modules are connected in series and in parallel.

A typical lithium ion battery cell includes an electrode assembly having a porous positive electrode current collector, a negative electrode current collector, and a separator alternately overlapping each other, and a cell packaging material containing the electrode assembly and the electrolyte. Such battery cells may be classified into can type battery cells or pouch type battery cells, depending on the shape of the cell exterior material.

On the other hand, recently, the biggest social issue with respect to the battery is the safety issue of the battery. In the case of laptops and mobile phones, the population of users is rapidly increasing, and it is urgent to ensure battery safety in that the explosion of the battery not only causes damage to portable electronic products but also leads to fire. Therefore, in the related art, various protection devices are used to secure the safety of the battery by blocking the charge / discharge current when detecting the abnormal state of the battery.

Such a conventional battery pack protection device is connected to a cell assembly consisting of at least one battery cell, and in general, a line through which charge and discharge current flows to protect the battery pack when an abnormal condition such as overcharge, overdischarge, short circuit, or overcurrent occurs. It includes a fuse for irreversibly disconnecting the current to block the flow of current and a sense resistor for sensing the magnitude of the charge / discharge current.

However, such a conventional battery pack protection device may not properly detect a swelling phenomenon of a battery cell. If the charging / discharging current is cut off by detecting the swelling of the battery cell, the swelling of the battery cell may already occur and the battery cell may be damaged.

Here, the swelling phenomenon of the cell refers to a phenomenon in which the pressure inside the cell increases rapidly and the can swells. Such swelling may occur mainly due to gas generation inside the cell, such as when gas is generated due to heat generation or ignition of the lithium ion battery cell electrode, or when gas is generated due to decomposition of the electrolyte by overvoltage.

Such a cell swelling phenomenon may cause an explosion of the battery pack, which may destroy the battery pack and the device to which the battery pack is attached, and may also cause personal injury. In addition, breakage of the cell exterior material may cause leakage of electrolyte inside the cell, which may cause additional damage such as a short circuit, an electric shock, and a fire. In particular, when a high voltage battery is used, such as a hybrid vehicle or an electric vehicle, this damage situation may occur more seriously.

The present invention has been made under the background of the prior art, and relates to an improved battery self-discharge device capable of effectively self-discharging a battery in a process of self-discharging a battery having one or more secondary cells.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized by the means and combinations thereof indicated in the claims.

Battery self-discharge device according to an embodiment of the present invention for achieving the above object, the cell assembly having a charge switch and a discharge switch connected in series on a charge and discharge path for supplying charge and discharge current to the cell assembly; An apparatus for self-discharging, the apparatus comprising: a voltage measurer electrically connected to both ends of the cell assembly and configured to measure voltages at both ends of the cell assembly; A current measurement unit electrically connected to a current sensor provided on the charge / discharge path and configured to measure charge / discharge current flowing through the charge / discharge path based on an electrical signal received from the current sensor; A temperature measuring unit configured to measure a measurement temperature of the cell assembly adjacent to the cell assembly; A self-discharge circuit having one end connected to the charge / discharge path and the other end connected to the ground such that a self-discharge current of the cell assembly flows; And receiving the value of the voltage at both ends, the value of the charging and discharging current, and the value of the measured temperature from the voltage measuring unit, the current measuring unit, and the temperature measuring unit, respectively. And a processor configured to calculate a resistance value of the cell assembly based on a value, and to self-discharge the cell assembly through the self-discharge circuit based on the calculated value of the resistance value and the measured temperature.

The self-discharge circuit may further include a self-discharge switch electrically connected to the processor to receive a control command from the processor and to open and close the self-discharge circuit based on the control command received from the processor; And a self discharge resistor disposed between the self discharge switch and the ground to consume the self discharge current.

In addition, the self-discharge circuit may be configured such that one end of the self-discharge circuit is electrically connected directly to the positive terminal of the cell assembly.

The self-discharge switch and the charge switch may include a source terminal, a gate terminal, and a drain terminal, respectively, and the source terminal of the self discharge switch may be configured to be electrically connected directly to the source terminal of the charge switch. .

The processor may control the operation of the self discharge switch such that the self discharge current flows sequentially through the cell assembly, the self discharge switch, and the self discharge resistor.

In addition, the self-discharge circuit may be configured such that one end of the self-discharge circuit is electrically connected directly between the charge switch and the discharge switch.

The self-discharge switch and the charge switch may include a source terminal, a gate terminal, and a drain terminal, respectively, and the source terminal of the self discharge switch may be configured to be electrically connected directly to the drain terminal of the charge switch. .

The processor may control operations of the charge switch and the self discharge switch such that the self discharge current flows sequentially through the cell assembly, the charge switch, the self discharge switch, and the self discharge resistor.

The processor may be configured to self-discharge the cell assembly through the self-discharge circuit when the resistance value of the cell assembly exceeds a preset threshold.

The processor may be configured to self-discharge the cell assembly through the self-discharge circuit when the measured temperature of the cell assembly exceeds a preset threshold.

In addition, the BMS according to an embodiment of the present invention includes a battery self discharge device according to the present invention.

In addition, the battery pack according to an embodiment of the present invention includes a battery self discharge device according to the present invention.

According to an aspect of the invention, there is an advantage that can prevent the swelling of the battery by effectively self-discharge the battery based on the resistance and temperature of the battery.

In particular, according to one embodiment of the present invention, by minimizing the synthesis resistance of the closed circuit is a self-discharge, there can be provided an improved battery self-discharge device that can reduce the heat generated by the self-discharge.

In addition to the present invention may have a variety of other effects, these other effects of the present invention can be understood by the following description, it will be more clearly understood by the embodiments of the present invention.

The following drawings attached to this specification are illustrative of preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.
1 is a view schematically showing the functional configuration of a battery self-discharge device according to an embodiment of the present invention.
2 is a diagram schematically illustrating a configuration in which a battery self-discharge device according to an embodiment of the present invention is connected to a partial configuration of a battery pack.
3 is a diagram schematically illustrating a configuration in which a self-discharge circuit according to an embodiment of the present invention is connected to some components of a battery pack.
4 shows a path through which a self-discharge current flows according to an embodiment of the present invention.
FIG. 5 is a diagram schematically illustrating a configuration in which a battery self-discharge device according to another embodiment of the present invention is connected to some components of a battery pack.
6 is a diagram schematically illustrating a configuration in which a self-discharge circuit according to another embodiment of the present invention is connected to a partial configuration of a battery pack.
7 illustrates a path through which a self-discharge current flows according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Throughout the specification, when a part is said to "include" a certain component, it means that it may further include other components, without excluding the other components unless otherwise stated. In addition, the term 'processor' described in the specification means a unit for processing at least one function or operation, which may be implemented in hardware or software, or a combination of hardware and software.

In addition, throughout the specification, when a part is "connected" to another part, it is not only "directly connected" but also "indirectly connected" with another element in between. Include.

In the present specification, the secondary battery means one independent cell having a negative electrode terminal and a positive electrode terminal and physically separable. For example, one pouch type lithium polymer cell may be regarded as a secondary battery.

Battery self-discharge device 1 according to an embodiment of the present invention, may be a device for self-discharge the cell assembly 10 having one or more secondary batteries. More specifically, the battery self-discharge device 1 according to an embodiment of the present invention, the voltage of the cell assembly 10 through self-discharge to prevent the swelling phenomenon of the cell assembly 10 due to high temperature or high voltage It may be a device for adjusting the.

For example, the battery self-discharge device 1 according to an embodiment of the present invention, as shown in the configuration of Figure 2, in series with each other on the charge-discharge path for supplying the charge-discharge current to the cell assembly 10 The charging switch 30 and the discharge switch 50 may be connected. Here, the battery self discharge device 1 according to an embodiment of the present invention may include a plurality of charge switches 30 connected in parallel with each other. In addition, the battery self discharge device 1 may include a plurality of discharge switches 50 connected in parallel with each other.

The charge switch 30 may open and close a charge / discharge path so that a current flows in a direction for charging the cell assembly 10. For example, the charge switch 30 is positioned on the charge / discharge path between the positive terminal of the cell assembly 10 and the positive terminal of the battery pack to charge and discharge the current so as to flow in a direction for charging the cell assembly 10. You can open and close the path.

The discharge switch 50 may open and close the charge / discharge path so that a current flows in the direction of discharging the cell assembly 10. For example, the discharge switch 50 is positioned on the charge / discharge path between the positive terminal of the cell assembly 10 and the positive terminal of the battery pack to charge and discharge the current so that the current flows in the direction of discharging the cell assembly 10. You can open and close the path.

For example, in the battery self-discharge device according to an embodiment of the present invention, as shown in the configuration of FIG. 2, one end of the charge switch 30 is directly connected to the positive terminal of the cell assembly 10 and the discharge switch. The charge switch 30 and the discharge switch 50 may be connected in series so that one end of the battery 50 is directly connected to the positive terminal of the battery pack.

For example, the charge switch 30 and the discharge switch 50 according to an embodiment of the present invention are field effect transistor (FET) devices having a gate, a drain, and a source terminal, and are disposed between the gate terminal and the source terminal. It may be turned on or off by whether a channel is formed according to an applied voltage. For example, the FET device may be a metal oxide semiconductor field effect transistor (MOSFET).

1 is a view schematically showing a functional configuration of a battery self-discharge device according to an embodiment of the present invention, Figure 2 is a battery self-discharge device according to an embodiment of the present invention is connected to a part of the battery pack It is a figure which shows schematic structure.

1 and 2, a battery self discharge device 1 according to an embodiment of the present invention includes a voltage measuring unit 200, a current measuring unit 300, a temperature measuring unit 400, and a self discharge circuit. 100 and processor 500.

The voltage measuring unit 200 may be electrically connected to both ends of the cell assembly 10. For example, as shown in the configuration of FIG. 2, the voltage measuring unit 200 may be electrically connected to both ends of the cell assembly 10 so as to transmit and receive electrical signals.

In addition, the voltage measuring unit 200 may be configured to measure the voltage across the cell assembly 10. More specifically, the voltage measuring unit 200 may measure voltages at both ends of the cell assembly 10 based on electrical signals received from both ends of the cell assembly 10. The voltage measuring unit 200 may be connected to the positive terminal of the cell assembly 10 and the negative terminal of the cell assembly 10, respectively, and measure voltages of both ends of the cell assembly 10.

Preferably, the voltage measuring unit 200 may be electrically connected to the processor 500 to transmit and receive electrical signals. In addition, the voltage measuring unit 200 measures a potential difference between the positive terminal of the cell assembly 10 and the negative terminal of the cell assembly 10 at time intervals under the control of the processor 500, and measures the magnitude of the measured voltage. The signal may be output to the processor 500. For example, the voltage measuring unit 200 may be implemented using a voltage measuring circuit generally used in the art.

The current measuring unit 300 may be electrically connected to the current sensor 70 provided on the charge / discharge path connected to the cell assembly 10 to receive an electrical signal from the current sensor 70. In addition, the current measuring unit 300 may be configured to measure the charge / discharge current flowing through the charge / discharge path based on the electrical signal received from the current sensor 70.

For example, as shown in the configuration of FIG. 2, the current measuring unit 300 according to an embodiment of the present invention may be electrically connected to both ends of the current sensor 70. Here, the current sensor 70 may be electrically connected between the negative terminal of the cell assembly 10 and the negative terminal of the battery pack. In addition, the current measuring unit 300 may measure the voltage across the current sensor 70 and measure the current flowing through the charge / discharge path based on the voltage across the current sensor 70. For example, the current measuring unit 300 may measure the current flowing through the charge / discharge path using Ohm's law based on the resistance value of the current sensor 70 and the voltage at both ends of the current sensor 70.

Preferably, the current measuring unit 300 may be electrically connected to the processor 500 to exchange electrical signals. In addition, the current measuring unit 300 repeatedly measures the magnitude of the charging current or the discharging current of the cell assembly 10 at a time interval under the control of the processor 500, and generates a signal indicating the magnitude of the measured current. Can be printed as For example, the current sensor 70 may be implemented using a hall sensor or sense resistor generally used in the art.

The temperature measuring unit 400 may measure the measured temperature of the cell assembly 10 adjacent to the cell assembly 10. In addition, the temperature measuring unit 400 may be electrically connected to the cell assembly 10 adjacent to the cell assembly 10 to transmit and receive electrical signals. Alternatively, the temperature measuring unit 400 may be mounted on the cell assembly 10 and electrically connected to the cell assembly 10. Through such a configuration, the temperature measuring unit 400 may measure the temperature of the cell assembly 10.

Preferably, the temperature measuring unit 400 may be mounted on an integrated circuit board of a battery management system (BMS). In particular, the temperature measuring unit 400 may be attached on the integrated circuit board. For example, the temperature measuring unit 400 may be an NTC thermistor (Negative Temperature Coefficient thermistor) mounted in a shouldered form on the integrated circuit board.

Preferably, the temperature measuring unit 400 may be electrically coupled with the processor 500 to transmit and receive an electrical signal. In addition, the temperature measuring unit 400 may repeatedly measure the temperature of the cell assembly 10 at a time interval and output a signal indicating the magnitude of the measured temperature to the processor 500. For example, the temperature measuring unit 400 may be implemented using a thermocouple commonly used in the art.

The self-discharge circuit 100 may be configured to flow a self-discharge current of the cell assembly 10. In addition, the self-discharge circuit 100, as shown in the configuration of Figure 2, one end is connected to the charge and discharge path and the other end is connected to the ground (G) of the BMS flows through the self-discharge current of the cell assembly 10 It can be configured to.

Preferably, the self-discharge circuit 100 according to an embodiment of the present invention, as shown in the configuration of Figure 2, may include a self-discharge switch 110 and a self-discharge resistor 130.

The self discharge switch 110 may be electrically connected to the processor 500 to transmit and receive an electrical signal. In addition, the self-discharge switch 110 may receive a control command from the processor 500 and open and close the self-discharge circuit 100 based on the control command received from the processor 500.

The self discharge resistor 130 may be a resistor that consumes a self discharge current. For example, as shown in the configuration of FIG. 2, the self discharge resistor 130 may be configured to consume the self discharge current by being located between the self discharge switch 110 and the ground G of the BMS. .

The processor 500 may be electrically connected to the voltage measuring unit 200, the current measuring unit 300, and the temperature measuring unit 400 so as to exchange electrical signals with each other. In addition, the processor 500 includes a voltage value of both ends of the cell assembly 10, a charge / discharge current value, and a cell assembly 10 from the voltage measuring unit 200, the current measuring unit 300, and the temperature measuring unit 400. Each of the values of the measured temperature can be received.

The processor 500 may further include a resistor of the cell assembly 10 based on the values of the voltages at both ends of the cell assembly 10 received from the voltage measuring unit 200 and the current measuring unit 300 and the value of the charge / discharge current. Can compute a value. For example, the processor 500 may calculate the resistance value of the cell assembly 10 using Ohm's law based on the value of the voltage across the cell assembly 10 and the value of the charge / discharge current.

In addition, the processor 500 may self-discharge the cell assembly 10 through the self-discharge circuit 100 based on the resistance value of the cell assembly 10 and the value of the measured temperature of the cell assembly 10. For example, the processor 500 may self-discharge the cell assembly 10 through the self discharge circuit 100 by controlling the operation of the self discharge switch 110 based on the resistance value of the cell assembly 10. have. Alternatively, the processor 500 controls the operation of the self discharge switch 110 and the charge switch 30 based on the resistance value of the cell assembly 10 to operate the cell assembly 10 through the self discharge circuit 100. Can self discharge.

In addition, the processor 500 may control the operation of the self-discharge switch 110 based on the measured temperature value of the cell assembly 10 to self-discharge the cell assembly 10 through the self-discharge circuit 100. have. Alternatively, the processor 500 controls the operations of the self-discharge switch 110 and the charge switch 30 based on the value of the measured temperature of the cell assembly 10 to allow the cell assembly 10 through the self-discharge circuit 100. ) Can self-discharge.

Preferably, the self-discharge switch 110 and the charge switch 30 according to an embodiment of the present invention may be a FET having a gate terminal, a source terminal and a drain terminal. Here, the processor 500 according to an embodiment of the present invention outputs a control signal for directly or indirectly controlling a voltage applied between the gate terminal and the source terminal of each of the self-discharge switch 110 and the charge switch 30. By controlling the channel formation of each of the self-discharge switch 110 and the charge switch 30, it is possible to control the on-off operation of each of the self-discharge switch 110 and the charge switch 30 accordingly.

Preferably, the battery self-discharge device 1 according to an embodiment of the present invention may further include a memory device 600, as shown in the configuration of FIGS. 1 and 2.

The memory device 600 may be electrically connected to the processor 500 to transmit and receive electrical signals. In addition, the memory device 600 may store information necessary for controlling the self discharge switch 110, the charge switch 30, and the discharge switch 50 in advance.

Preferably, in the self-discharge circuit 100 according to the embodiment of the present invention, one end of the self-discharge circuit 100 is electrically connected to the positive terminal of the cell assembly 10, as shown in FIG. 2. It can be configured to connect directly. More specifically, in the self-discharge circuit 100, as shown in the configuration of FIG. 2, one end of the self-discharge circuit 100 is directly connected between the positive terminal of the cell assembly 10 and one end of the charge switch 30. It may be configured to be connected. In addition, the other end of the self-discharge circuit 100 may be directly connected to the ground (G) of the BMS.

Preferably, the processor 500 according to an embodiment of the present invention, when the resistance value of the cell assembly 10 exceeds a preset threshold, the cell assembly 10 through the self-discharge circuit 100 Can self discharge. For example, when the resistance value of the cell assembly 10 is large, a swelling phenomenon may occur in the cell assembly 10, thereby degrading the performance of the cell assembly 10. The processor 500 according to an embodiment of the present invention may include a self-discharge switch 110 when the resistance value of the cell assembly 10 exceeds a preset threshold to prevent swelling of the cell assembly 10. And the charge switch 30 may control the operation of the cell assembly 10 through the self-discharge circuit 100. Here, the threshold for the resistance value of the cell assembly 10 may be stored in advance in the memory device 600.

Further, preferably, the processor 500 according to an embodiment of the present invention, when the measured temperature of the cell assembly 10 exceeds a preset threshold, the cell assembly 10 through the self-discharge circuit 100 ) Can self-discharge. For example, when the measurement temperature of the cell assembly 10 is large, swelling may occur in the cell assembly 10, thereby degrading the performance of the cell assembly 10. The processor 500 according to an embodiment of the present invention may include a self-discharge switch 110 when the measured temperature of the cell assembly 10 exceeds a preset threshold to prevent swelling of the cell assembly 10. And the charge switch 30 may control the operation of the cell assembly 10 through the self-discharge circuit 100. Here, the threshold for the measured temperature of the cell assembly 10 may be stored in advance in the memory device 600.

Meanwhile, the processor 500 may include a processor 500 known in the art, an application-specific integrated circuit (ASIC), another chipset, a logic circuit, a register, a communication modem, and / or data in order to perform the above-described operation. It may be implemented in a form that optionally includes a processing device.

On the other hand, the memory device 600 is not particularly limited as long as it is a storage medium capable of recording and erasing information. For example, the memory device 600 may be a RAM, a ROM, a register, a hard disk, an optical recording medium, or a magnetic recording medium. The memory device 600 may also be electrically connected to the processor 500, for example, via a data bus or the like so as to be accessible by the processor 500, respectively. The memory device 600 may also store and / or update and / or erase and / or transmit a program including various control logics that the processor 500 performs, and / or data generated when the control logic is executed. have.

3 is a diagram schematically illustrating a configuration in which a self-discharge circuit according to an embodiment of the present invention is connected to a partial configuration of a battery pack, and FIG. 4 is a path through which a self-discharge current flows according to an embodiment of the present invention. Shows.

3 and 4, the battery self discharge device according to an embodiment of the present invention may form a closed circuit connecting the cell assembly 10 and the self discharge resistor 130. More specifically, the battery self-discharge device, as shown in the configuration of Figures 2 and 3, the self-discharge resistor from the cell assembly 10 past the self-discharge switch 110 from the cell assembly 10 with the ground (G) of the BMS as a connection point An electrical closed circuit connected to 130 may be configured.

The self-discharge switch 110 and the charge switch 30 according to an embodiment of the present invention, as shown in the configuration of Figure 3, the source terminal (LS, CS), the gate terminal (LG, CG) and The drain terminals LD and CD may be provided, respectively.

The self discharge switch 110 and the charge switch 30 may be provided on the self discharge circuit 100 and the charge / discharge path, respectively, and may be selectively turned on or off. Here, the self-discharge switch 110 and the charge switch 30 is a field effect transistor (FET) device having a gate, a drain, and a source terminal. The self-discharge switch 110 and the charge switch 30 may be formed depending on whether a channel is formed according to a voltage applied between the gate terminal and the source terminal. It can be turned on or off by For example, the FET device may be a metal oxide semiconductor field effect transistor (MOSFET).

In addition, the self-discharge switch 110 and the charge switch 30 may be provided with parasitic diodes 111 and 31, respectively. As shown in the configuration of FIG. 3, when the parasitic diodes 111 and 31 are provided in the self-discharge switch 110 and the charge switch 30, the self-discharge switch 110 and the charge switch 30 may be It may be divided into FET bodies 112 and 32 and parasitic diodes 111 and 31. Here, the parasitic diodes 111 and 31 are diodes connected in parallel with the FET bodies 112 and 32, and may perform rectification to conduct rectification in one direction.

Meanwhile, in the embodiment of FIG. 3, the charge switch 30 is implemented with an N-type MOSFET, and the self discharge switch 110 is implemented with a P-type MOSFET, wherein the charge switch 30 and the self discharge switch ( 110) is not limited to the N-type MOSFET and the P-type MOSFET, respectively.

Preferably, the source terminal LS of the self-discharge switch 110 according to the embodiment of the present invention is electrically connected to the source terminal CS of the charging switch 30, as shown in the configuration of FIG. 3. It can be configured to connect directly. Through such a configuration, the battery self discharge device according to the embodiment of the present invention may configure a closed circuit including only the cell assembly 10, the self discharge switch 110, and the self discharge resistor 130. Here, the self-discharge current may flow in the closed circuit.

In addition, through such a configuration, the battery self-discharge device according to an embodiment of the present invention can minimize the number of elements through which the self-discharge current passes, thereby minimizing the synthesis resistance of the closed circuit to minimize the heat generated by the self-discharge. Can be. For example, compared with the embodiment of FIG. 6, in the embodiment of FIG. 3, the self-discharge current does not pass through the parasitic diode of the charge switch, thereby minimizing heat generation.

More preferably, the processor 500 according to an embodiment of the present invention, as shown in the configuration of Figure 4, the self-discharge current is the cell assembly 10, self-discharge switch 110 and self-discharge resistor ( The operation of the self discharge switch 110 may be controlled to sequentially flow 130. For example, referring to FIGS. 3 and 4 together, a battery self-discharge device according to an embodiment of the present invention may include a closed circuit including only a cell assembly 10, a self discharge switch 110, and a self discharge resistor 130. Can be configured. Here, the processor 500 may turn on the self discharge switch 110 to allow a self discharge current to flow. More specifically, the self-discharge current may sequentially flow through the cell assembly 10, the FET body 112, the self-discharge resistor 130, and the ground G of the self-discharge switch 110.

FIG. 5 is a diagram schematically illustrating a configuration in which a battery self-discharge device according to another embodiment of the present invention is connected to some components of a battery pack. In addition, in the present embodiment, a detailed description of parts to which the description of the above embodiments can be similarly applied will be omitted, and description will be given focusing on differences.

1 and 5, a battery self discharge device according to an embodiment of the present invention may include a self discharge circuit 100.

The self-discharge circuit 100 may be configured to flow a self-discharge current of the cell assembly 10. In addition, the self-discharge circuit 100, as shown in the configuration of Figure 5, one end is connected to the charge and discharge path and the other end is connected to the ground (G) of the BMS flows through the self-discharge current of the cell assembly 10 It can be configured to.

Preferably, in the self-discharge circuit 100 according to an embodiment of the present invention, as shown in the configuration of FIG. 5, one end of the self-discharge circuit 100 is the charge switch 30 and the discharge switch 50. It can be configured to be electrically connected directly therebetween.

Through such a configuration, the battery self-discharge device according to an embodiment of the present invention may control the operation of the charge switch 30 and the self-discharge switch 110 to self-discharge the cell assembly 10. Here, the self-discharge current may flow through the cell assembly 10, the charge switch 30, the self-discharge switch 110, the self-discharge resistor 130, and the ground G.

6 is a diagram schematically illustrating a configuration in which a self-discharge circuit according to another embodiment of the present invention is connected to some components of a battery pack, and FIG. 7 is a path through which a self-discharge current flows according to another embodiment of the present invention. Shows. In addition, in the present embodiment, a detailed description of parts to which the description of the above embodiments can be similarly applied will be omitted, and description will be given focusing on differences.

6 and 7, the battery self discharge device according to an embodiment of the present invention may configure a closed circuit connecting the cell assembly 10 and the self discharge resistor 130. More specifically, the battery self-discharge device, as shown in the configuration of Figures 6 and 7, the charge switch 30 and the self-discharge switch 110 from the cell assembly 10 with the ground (G) of the BMS as a connection point Pass through) may constitute an electrical closed circuit connected to the self-discharge resistor 130.

Preferably, the source terminal LS of the self-discharge switch 110 according to the exemplary embodiment of the present invention has a drain terminal CD of the charge switch 30, as shown in the configuration of FIGS. 6 and 7. And may be configured to be electrically connected directly with the. Through such a configuration, the battery self discharge device according to another embodiment of the present invention comprises a closed circuit composed of only the cell assembly 10, the charge switch 30, the self discharge switch 110 and the self discharge resistor 130. can do. Here, the self-discharge current may flow in the closed circuit.

More preferably, the processor 500 according to an embodiment of the present invention, as shown in the configuration of Figure 7, the self-discharge current cell assembly 10, the charge switch 30, the self-discharge switch 110 ) And the operation of the charge switch 30 and the self discharge switch 110 may be controlled to sequentially flow through the self discharge resistor 130. For example, referring to FIG. 6 and FIG. 7, a battery self discharge device according to an embodiment of the present invention includes a cell assembly 10, a charge switch 30, a self discharge switch 110, and a self discharge resistor. A closed circuit composed of only 130 can be configured. Here, the processor 500 may turn off the charge switch 30 and turn on the self discharge switch 110 to allow a self discharge current to flow. More specifically, the self-discharge current includes the cell assembly 10, the parasitic diode 31 of the charge switch 30, the FET body 112 of the self-discharge switch 110, the self-discharge resistor 130, and the ground (G). ) Can flow sequentially.

Through such a configuration, the battery self-discharge device according to an embodiment of the present invention can effectively prevent the swelling of the cell assembly by controlling the switch based on the temperature or resistance of the cell assembly to self-discharge the cell assembly. It has an effect.

The battery self discharge device according to the present invention can be applied to a BMS. That is, the BMS according to the present invention may include the battery self-discharge device according to the present invention described above. In such a configuration, at least some of the components of the battery self-discharge device according to the present invention may be implemented by supplementing or adding a function of the configuration included in the conventional BMS. For example, the processor 500 and the memory device 600 of the battery self-discharge apparatus according to the present invention may be implemented as a component of a battery management system (BMS).

In addition, the battery self-discharge device according to the present invention may be provided in a battery pack. That is, the battery pack according to the present invention may include the battery self-discharge device according to the present invention described above. Here, the battery pack may include at least one secondary battery, the battery self-discharge device, an electronic device (with a BMS, a relay, a fuse, etc.), a case, and the like.

In addition, when the control logic is implemented in software, the processor may be implemented in a set of program modules. In this case, the program module may be stored in the memory device and executed by the processor.

In addition, various control logics of the processor may be combined with at least one, and the combined control logics are not limited in kind as long as they are written in a computer readable code system and accessible to the computer. In one example, the recording medium includes at least one selected from the group consisting of a ROM, a RAM, a register, a CD-ROM, a magnetic tape, a hard disk, a floppy disk, and an optical data recording device. In addition, the code system may be distributed and stored and executed in a networked computer. In addition, functional programs, code, and segments for implementing the combined control logics can be easily inferred by programmers in the art to which the present invention pertains.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims to be described.

Meanwhile, terms such as 'memory device' and 'processor' are used in the present specification. However, the term 'memory device' and 'processor' are used to refer to a logical unit, and are not necessarily referring to components that may be physically separated or physically separated. Self-explanatory

1: battery self-discharge device
10: cell assembly
30: charge switch
31: Parasitic Diode
32: FET body
50: discharge switch
70: current sensor
100: self-discharge circuit
110: self discharge switch
111: parasitic diodes
112: FET main body
130: self discharge resistance
200: voltage measuring unit
300: current measuring unit
400: temperature measuring unit
500: processor
600: memory device
G: ground
CD: drain terminal
CS: source jack
CG: gate terminal
LD: drain terminal
LS: Source terminal
LG: gate terminal

Claims (12)

An apparatus for self-discharging the cell assembly, comprising a charge switch and a discharge switch connected in series with each other on a charge / discharge path for supplying charge / discharge current to a cell assembly.
A voltage measurer electrically connected to both ends of the cell assembly and configured to measure a voltage at both ends of the cell assembly;
A current measurement unit electrically connected to a current sensor provided on the charge / discharge path and configured to measure charge / discharge current flowing through the charge / discharge path based on an electrical signal received from the current sensor;
A temperature measuring unit configured to measure a measurement temperature of the cell assembly adjacent to the cell assembly;
A self-discharge circuit having one end connected to the charge / discharge path and the other end connected to the ground such that a self-discharge current of the cell assembly flows; And
Receive the value of the voltage between the both ends, the value of the charging and discharging current and the value of the measured temperature from the voltage measuring unit, the current measuring unit and the temperature measuring unit, respectively, A processor configured to calculate a resistance value of the cell assembly, and to self-discharge the cell assembly through the self-discharge circuit based on the calculated value of the resistance and the measured temperature.
Battery self-discharge device comprising a.
The method of claim 1,
The self-discharge circuit,
A self discharge switch electrically connected to the processor, the self discharge switch configured to receive a control command from the processor and to open and close the self discharge circuit based on the control command received from the processor; And
A self discharge resistor configured to consume the self discharge current located between the self discharge switch and the ground;
Battery self-discharge device characterized in that it comprises a.
The method of claim 2,
Wherein the self-discharge circuit is configured such that one end of the self-discharge circuit is electrically connected directly to the positive terminal of the cell assembly.
The method of claim 3,
The self discharge switch and the charge switch each include a source terminal, a gate terminal, and a drain terminal,
The source terminal of the self-discharge switch, the battery self-discharge device, characterized in that configured to be electrically connected directly to the source terminal of the charge switch.
The method of claim 4, wherein
And the processor controls an operation of the self discharge switch such that the self discharge current flows sequentially through the cell assembly, the self discharge switch, and the self discharge resistor.
The method of claim 2,
And the self-discharge circuit is configured such that one end of the self-discharge circuit is electrically connected directly between the charge switch and the discharge switch.
The method of claim 6,
The self discharge switch and the charge switch each include a source terminal, a gate terminal, and a drain terminal,
The source terminal of the self-discharge switch, the battery self-discharge device, characterized in that configured to be directly connected to the drain terminal of the charge switch.
The method of claim 7, wherein
The processor may control an operation of the charge switch and the self discharge switch such that the self discharge current flows sequentially through the cell assembly, the charge switch, the self discharge switch, and the self discharge resistor. Discharge device.
The method of claim 1,
And the processor is configured to self-discharge the cell assembly through the self-discharge circuit when the resistance value of the cell assembly exceeds a preset threshold.
The method of claim 1,
And the processor is configured to self-discharge the cell assembly through the self-discharge circuit when the measured temperature of the cell assembly exceeds a preset threshold.
BMS comprising a battery self-discharge device according to any one of claims 1 to 10.
A battery pack comprising a battery self discharge device according to any one of claims 1 to 10.

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