Protection circuit module and battery pack including the same

Abstract

To provide a protection circuit module that can effectively protect an analog front end integrated circuit (AFEIC) from electrostatic discharge, and a battery pack including the same.SOLUTION: The present disclosure relates to a protection circuit module and a battery pack including the same, and includes a substrate formed with a first surface and a second surface, a connector electrically connected to a battery cell provided on the first surface, an over-voltage prevention element provided on the second surface and electrically connected to a connector, and a fuse provided on the first surface and electrically connected to the over-voltage prevention element.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a protection circuit module for protecting a battery management device from electrostatic discharge and a battery pack including the same. [Background technology]

[0002] A battery pack typically consists of a number of battery cells connected in series. In order to maintain the battery pack in a proper operating state, it is necessary to periodically monitor the current, voltage, temperature, etc. of each of the battery cells constituting the battery pack. In order to monitor each of the battery cells, the battery pack is provided with a sensing line. The sensing line is connected to a protection circuit module through a connector.

[0003] The protection circuit module can protect the IC, which is connected to the sensing line and monitors each of the multiple battery cells, from hazards such as overvoltage, overcurrent, etc. Such a protection circuit module can include a number of passive elements, such as an overvoltage protection element, a fuse, and a resistor, to increase resistance to electrostatic discharge (ESD).

[0004] On the other hand, the distance between the connector and the overvoltage protection element increases due to the large number of passive elements disposed on the substrate of the protection circuit module, and the increased distance between the connector and the overvoltage protection element may cause problems in reducing the performance of the protection circuit module.

[0005] The above information disclosed in the Background of the Invention is intended to enhance the understanding of the background of the present invention and may therefore include information that does not constitute prior art. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Korean Patent Publication No. 10-2010-0003320 Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide a protection circuit module that can effectively protect a battery management device (AFE IC, Analog Front End Integrated Circuit) from electrostatic discharge, and a battery pack including the same.

[0008] However, the technical problems that the present invention aims to solve are not limited to the problems mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art from the following description of the invention. [Means for solving the problem]

[0009] To solve the above technical problems, one embodiment of the present invention provides a protection circuit module comprising: a connector and a fuse on a first surface of a substrate; an overvoltage protection element on a second surface of the substrate; and electrically connecting the overvoltage protection element, the connector, and the fuse through conductive vias. Effect of the Invention

[0010] According to one aspect of the present invention, by configuring a protection circuit module so that the elements are arranged in the following order: connector-fuse-overvoltage protection element, the inductance component of the protection circuit module can be reduced, thereby improving the overvoltage protection performance of the protection circuit module.

[0011] However, the effects obtained through the present invention are not limited to the effects described above, and other technical effects not mentioned herein will be clearly understood by those skilled in the art from the following description of the invention. [Brief description of the drawings]

[0012] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention described below, serve to facilitate a better understanding of the technical ideas of the present invention. The present invention should not be interpreted as being limited to only the matters depicted in these drawings.

[0013] [Figure 1] 1 shows a side view of a protection circuit module. [Diagram 2] 1 shows the top surface of the protection circuit module. [Diagram 3] 1 shows the underside of the protection circuit module. [Figure 4] 1 shows a circuit including an overvoltage protection element. [Diagram 5] 1 shows a circuit diagram of a conventional protection circuit module. [Figure 6] 1 shows a circuit diagram of a protection circuit module. [Figure 7] 1 illustrates a battery pack. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms and words used in the present specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as being consistent with the technical idea of ​​the present invention, based on the principle that the inventor can appropriately define the concept of the term to best describe the invention. Therefore, it should be understood that the embodiments described in this specification and the configurations shown in the drawings are merely some of the most preferred embodiments of the present invention, and do not fully describe the technical idea of ​​the present invention, and therefore there may be various equivalents and modifications that can replace them at the time of filing this application. In addition, when used in this specification, "comprise, include" and / or "comprising, including" specify the presence of the mentioned shapes, numbers, steps, operations, members, elements, and / or groups thereof, and do not exclude the presence or addition of one or more other shapes, numbers, operations, members, elements, and / or groups. In addition, when describing an embodiment of the present invention, "may" and "may be" may include "one or more embodiments of the present invention."

[0015] In order to facilitate understanding of the invention, the accompanying drawings are not drawn to scale, and the dimensions of some components may be exaggerated. In addition, the same reference numerals may be used to refer to the same components in different embodiments.

[0016] A reference to two comparative objects being "identical" means that they are "substantially identical." Thus, substantially identical may include cases where there is a deviation that is considered to be a low level in the art, for example, within 5%. In addition, a certain parameter being uniform in a given region may mean that it is uniform in the average sense.

[0017] Even if the terms "first", "second", etc. are used to describe various components, it is understood that these components are not limited by these terms. These terms are merely used to distinguish one component from another, and it is understood that a first component can also be a second component unless otherwise specified.

[0018] Throughout the specification, unless specifically stated to the contrary, each element may be singular or plural.

[0019] When an arbitrary structure is disposed on the "top (or bottom)" of a component, or on (above) (below) of a component, it may mean that the arbitrary structure is disposed in contact with the upper surface (or lower surface) of the component, but also that another structure may be interposed between the component and the arbitrary structure disposed on (or below) the component.

[0020] In addition, when a certain component is described as being "coupled," "coupled," or "connected" to another component, it should be understood that the components may be directly coupled or connected to each other, but there may also be another component "intervening" between each component, or each component may be "coupled," "coupled," or "connected" through another component. In addition, when a part is said to be electrically coupled to another part, this includes not only the case where they are directly connected, but also the case where they are connected via another element in between.

[0021] Throughout the specification, "A and / or B" means A, B, or A and B, unless specifically stated to the contrary. That is, "and / or" includes all or any combination of the listed items. "C through D" means at least C and at most D, unless specifically stated to the contrary.

[0022] FIG. 1 shows a side view of the protection circuit module, FIG. 2 shows a top view of the protection circuit module, and FIG. 3 shows a bottom view of the protection circuit module.

[0023] 1 to 3, a protection circuit module 100 according to an embodiment of the present invention may include a substrate 110, at least one overvoltage protection element 130 of a connector 120, and at least one fuse 140. The protection circuit module 100 may include as many overvoltage protection elements 130 and fuses 140 as the number of battery cells connected to the connector 120. For example, assuming that the number of battery cells connected to the connector 120 is five, the protection circuit module 100 may include five each of overvoltage protection elements 130 and fuses 140.

[0024] At least one electronic component may be mounted on the substrate 110. In one embodiment, the substrate 110 may be a rigid printed circuit board or a flexible printed circuit board. In one embodiment, the substrate 110 may be a double-sided printed circuit board or a multi-layer printed circuit board.

[0025] The substrate 110 may include a plurality of layers. The plurality of layers may include a first outer layer disposed on a first side 110A of the substrate 110 and a second outer layer disposed on a second side 110B of the substrate 110 opposite the first side 110A of the substrate 110. The first side 110A may be a top side of the substrate 110. The second side 110B may be a bottom side of the substrate 110. The plurality of layers may include at least one inner layer disposed between the first outer layer and the second outer layer.

[0026] The substrate 110 may include at least one insulating layer. The insulating layer is provided between layers in which conductive regions are formed, and may prevent interlayer current from flowing in regions other than the conductive vias. The insulating layer may be made of an insulating material.

[0027] The substrate 110 may include a conductive region 150. The conductive region 150 may be disposed in at least one of a plurality of layers included in the substrate 110. The conductive region 150 may be disposed in at least one of a first outer layer, a second outer layer, and an inner layer. The conductive region 150 may electrically connect electronic components mounted on the substrate 110 to each other. The conductive region 150 may electrically connect at least one electronic component mounted on the substrate 110 to an external electronic component to each other.

[0028] According to an embodiment, the conductive region 150 may be made of copper, aluminum, silver, tin, gold, nickel, lead, titanium, or an alloy thereof, but the materials constituting the conductive region 150 are not limited to those mentioned above, and the conductive region 150 may be made of various conductive materials.

[0029] According to an embodiment, the conductive region 150 may include at least one first conductive via 151, at least one second conductive via 152, at least one first conductive line 153, at least one second conductive line 154, and at least one third conductive line 155. The substrate 110 may include the first conductive vias 151, the second conductive vias 152, the first conductive lines 153, the second conductive lines 154, and the third conductive lines 155 in a number equal to the number of battery cells connected to the connector 120. For example, assuming that the number of battery cells connected to the connector 120 is five, the substrate 110 may include five each of the first conductive vias 151, the second conductive vias 152, the first conductive lines 153, the second conductive lines 154, and the third conductive lines 155.

[0030] First conductive via 151 may be formed through first surface 110A and second surface 110B of substrate 110. First conductive via 151 may be formed in a region below an area where connector 120 is disposed or in a peripheral region thereof. First conductive via 151 may be connected to connector 120.

[0031] Second conductive via 152 may be formed penetrating first surface 110A and second surface 110B of substrate 110. Second conductive via 152 may be formed at a position spaced a predetermined distance from first conductive via 151 in the longitudinal direction of substrate 110.

[0032] The first conductive line 153 may be disposed on the second surface 110B of the substrate 110. The first conductive line 153 may be disposed on a second outer layer of the substrate 110. The first conductive line 153 may be disposed on an inner layer of the substrate 110. The first conductive line 153 may have one end connected to the first conductive via 151 and the other end connected to the second conductive via 152. The first conductive line 153 may be connected to the overvoltage protection element 130.

[0033] The second conductive line 154 may be disposed on the first side 110A of the substrate 110. The second conductive line 154 may be disposed on a first outer layer of the substrate 110. The second conductive line 154 may also be disposed on an inner layer of the substrate 110. The second conductive line 154 may be connected at one end to the second conductive via 152 and at the other end to the fuse 140.

[0034] The third conductive line 155 may be disposed on the first surface 110A of the substrate 110. The third conductive line 155 may be disposed on a first outer layer of the substrate 110. The third conductive line 155 may be disposed on an inner layer of the substrate 110. One end of the third conductive line 155 may be connected to the fuse 140, and the other end may be connected to an AFE IC (Analog Front End Integrated Circuit) 200. The AFE IC 200 can detect at least one of the temperature, voltage, and current of each of the battery cells connected to the connector 120, and output the detection result to the outside (for example, a control device of a battery management device).

[0035] The substrate 110 may include a ground region 160. The ground region 160 may be disposed on a second surface 110B of the substrate 110. The ground region 160 may be disposed on a second outer layer of the substrate 110. The ground region 160 may also be disposed on an inner layer of the substrate 110. According to an embodiment, the ground region 160 may be formed at a position spaced a predetermined distance from the first conductive line in the longitudinal direction of the substrate 110.

[0036] The connector 120 may be disposed on the first surface 110A of the substrate 110. The connector 120 may be disposed on a first outer layer. The connector 120 may be a device for connecting at least one battery cell to the AFE IC 200. The connector 120 may electrically connect the at least one battery cell and the AFE IC 200. The connector 120 may include at least one terminal configured to be connected to the battery cell. The terminal may be connected to the battery cell by a wire or a bus. The connector 120 may include a terminal configured to be connected to a B+ high current line and a terminal configured to be connected to a B- high current line. The connector 120 may be connected to the first conductive via 151.

[0037] The overvoltage protection element 130 may be disposed on the second surface 110B. The overvoltage protection element 130 may be disposed on the second outer layer. According to an embodiment, the overvoltage protection element 130 may include a TVS (Transient Voltage Suppressor) diode. However, the overvoltage protection element 130 is not limited to the above-mentioned elements, and various elements capable of limiting the voltage applied to the connector 120 may be used as the overvoltage protection element 130.

[0038] The overvoltage protection element 130 may become conductive when a voltage equal to or greater than a preset magnitude is applied. When the overvoltage protection element 130 becomes conductive, a portion of the voltage applied to the connector 120 is absorbed by the overvoltage protection element 130, thereby preventing an excessive voltage from being applied to the AFE IC 200. The overvoltage protection element 130 may have one end connected to the first conductive line 153 and the other end connected to the ground region 160.

[0039] The fuse 140 may be disposed on the first surface 110A. The fuse 140 may be disposed on a first outer layer. When a current having a value exceeding a preset critical value is applied to the fuse 140 (i.e., when an overcurrent occurs), the fuse 140 may be melted to protect the AFE IC 200 from an overcurrent. The fuse 140 may have one end connected to the second conductive line 154 and the other end connected to the third conductive line 155.

[0040] FIG. 4 shows a circuit including an overvoltage protection element.

[0041] As shown in FIG. 4, in a circuit in which an overvoltage protection element 420 is connected between a connector 410 and an AFE IC 430, when a voltage due to electrostatic discharge (ESD) is applied to the connector, the voltage applied to the AFE IC 430 (the voltage at the A node) can be defined by the following equation (1).

[0042]

number

[0043] Here, V ESD is the voltage applied to the AFE IC430 by electrostatic discharge (the voltage at the A node), and V BR_TVS is the breakdown voltage of the overvoltage protection element 420 (the voltage at which the overvoltage protection element 420 begins to clamp), and R DYN_TVS is the internal resistance of the overvoltage protection element 420, and I ESDis the current flowing through the overvoltage protection element 420, and L may represent the inductance of the entire circuit.

[0044] When the inductance components L1 and L3 of the protection circuit module 400 increase, the voltage (V ESD ) increases. Therefore, in order to reduce the voltage applied to the AFE IC 430 during electrostatic discharge, the inductance components L1 and L3 of the protection circuit module 400 need to be reduced.

[0045] 5 shows a circuit diagram of a conventional protection circuit module. In the protection circuit module 500 in which the connector 510, the fuse 520, and the overvoltage protection element 530 are all arranged on the upper surface of the substrate, the circuit is configured in the order of the connector 510-fuse 520-overvoltage protection element 530-AFE IC 540 as shown in FIG. 5. In the protection circuit module 500 having the circuit configuration as shown in FIG. 5, the distance between the connector 510 and the overvoltage protection element 530 is quite large, which causes an increase in the inductance component L1 of the circuit. In addition, the protection circuit module 500 having the circuit configuration as shown in FIG. 5 requires another conductive via to connect the overvoltage protection element 530 arranged on the upper surface of the substrate to the ground region arranged on the lower surface of the substrate, which causes an increase in the inductance component L3 of the circuit.

[0046] [Table 1]

[0047] Table 1 shows the voltage measured by the AFE IC 540 when an electrostatic discharge voltage of 27 kV is applied to the protection circuit module 500. As shown in Table 1, when an electrostatic discharge voltage of 27 kV is applied to the three terminals included in the connector 510, it can be confirmed that a maximum of 2247 V is applied to the AFE IC 540 in the protection circuit module 500.

[0048] FIG. 6 shows a circuit diagram of the protection circuit module according to the present embodiment. The protection circuit module 600, in which the connector 610 and the fuse 630 are disposed on the upper surface of the substrate and the overvoltage protection element 620 is disposed on the lower surface of the substrate, is configured as a circuit in the order of the connector 610-overvoltage protection element 620-fuse 630-AFE IC 640, as shown in FIG. 6. The protection circuit module 600 can reduce the distance between the connector 610 and the overvoltage protection element 620 compared to the conventional one, and therefore can reduce the inductance component L1 of the circuit compared to the conventional one. In addition, the protection circuit module 600 does not require a separate conductive via for connecting the overvoltage protection element 620 to the ground region by disposing the overvoltage protection element 620 and the ground region all on the lower surface of the substrate, and therefore can reduce the inductance component L3 of the circuit. In this way, the present embodiment can reduce the voltage applied to the AFE IC 640 when electrostatic discharge occurs by reducing the inductance component of the protection circuit module 600.

[0049] [Table 2]

[0050] Table 2 shows the voltages measured by the AFE IC 640 when an electrostatic discharge voltage of 27 kV is applied to the protection circuit module 600 according to this embodiment. As shown in Table 2, when an electrostatic discharge voltage of 27 kV is applied to the three terminals included in the connector 610, it can be seen that a maximum of 1895 V is applied to the AFE IC 640 in the protection circuit module 600.

[0051] FIG. 7 illustrates a battery pack. Referring to FIG. 7, a battery pack 700 according to an embodiment of the present invention has a structure that can be electrically connected to an external device through a positive electrode connection terminal (P(+)) and a negative electrode connection terminal (P(-)). When the external device is a load, the battery pack 700 operates as a power source that supplies power to the load and is discharged. The external device operating as a load may be, for example, an electronic device, a mobile device, or an energy storage system (ESS), and the mobile device may be, for example, an electric vehicle, a hybrid vehicle, or a smart mobility.

[0052] The battery pack 700 may include a number of battery cells 710, a protection circuit module 720, and an AFE IC 730. Of course, in various embodiments, the battery pack 700 may further include other components.

[0053] The battery cells 710 may be connected in series or parallel to each other to form at least one battery module. The battery module may include the battery cells 710 and a module housing. The battery modules may be connected in series or parallel to each other.

[0054] The battery cells 710 may be housed inside the module housing in a stacked form. The battery cells 710 may include an anode lead and a cathode lead. The battery cells 710 may be circular, rectangular, or pouch type battery cells depending on the battery form.

[0055] The battery pack 700 may have one stacked cell stack forming one module instead of a battery module. The cell stack may be accommodated in an accommodation space of a pack housing or in an accommodation space partitioned by a frame, a partition wall, etc.

[0056] The battery cells 710 may generate a large amount of heat during charging / discharging. The generated heat accumulates in the battery cells 710 and accelerates deterioration of the battery cells 710. Therefore, the battery pack 700 may further include a cooling member to suppress deterioration of the battery cells 710. The cooling member is provided at a lower portion of the accommodation space in which the battery cells 710 are provided, but is not limited thereto, and may be provided at an upper portion or a side portion depending on the battery pack.

[0057] Exhaust gas generated inside the battery cell 710 due to an abnormal operating condition, also known as a thermal runaway or thermal event, of the battery cell 710 may be discharged to the outside of the battery cell 710. The battery pack 700 or the battery module may include an exhaust port or the like for discharging the exhaust gas in order to prevent damage to the battery pack 700 or the module due to the exhaust gas.

[0058] The protection circuit module 720 may be a device for protecting the AFE IC 730 from hazards such as overvoltage, overcurrent, etc. The protection circuit module 720 may be electrically connected to the plurality of battery cells 710. The protection circuit module 720 may be electrically connected to the AFE IC 730. The protection circuit module 720 may be provided on a path connecting the plurality of battery cells 710 and the AFE IC 730.

[0059] The AFE IC730 can detect at least one of the temperature, voltage, and current of each of the battery cells 710 connected to the connector and output the detection result to the outside (e.g., a battery management device). The AFE IC730 can correspond to a component constituting the battery management device. The AFE IC730 can transmit information on the result of detecting at least one of the temperature, voltage, and current of each of the battery cells 710 to another component of the battery management device (e.g., a balancing device, a control device). The AFE IC730 can be electrically connected to the protection circuit module 720.

[0060] The battery pack 700 may include a battery and a battery management system (BMS) for managing the battery. The battery management system may include a detection device, a balancing device, and a control device.

[0061] The detection device can detect the status of the battery (voltage, current, temperature, etc.) and detect status information representing the status of the battery. The AFE IC 730 can correspond to the detection device. The detection device can detect the voltage of each cell or each battery module constituting the battery. The detection device can also detect the current flowing through the battery module or each battery module constituting the battery pack 700. The detection device can also detect the cell, module and / or ambient temperature at least one point of the battery.

[0062] The balancing device can perform a balancing operation of the battery modules and / or cells that constitute the battery. The control device can receive status information (voltage, current, temperature, etc.) of the battery modules from the detection device. The control device can monitor and calculate the status (voltage, current, temperature, State Of Charge (SOC), State Of Health (SOH), etc.) of the battery modules based on the status information received from the detection device. The control device can also perform control functions (e.g., temperature control, balancing control, charge / discharge control, etc.), protection functions (e.g., over-discharge, over-charge, over-current prevention, short circuit, fire extinguishing function, etc.), etc. based on the status monitoring results.

[0063] The control device may perform wired or wireless communication with an external device (e.g., a host controller, a vehicle, a charger, a PCS, etc.) of the battery pack 700. The control device may also control the charging / discharging operation and the protection operation of the battery.

[0064] The battery management device is a system that monitors the battery status and performs diagnostic, control, communication, and protection functions. It calculates the charge / discharge status, calculates the battery's lifespan or state of health (SOH), and can also cut off battery power (relay control) if necessary. It can also control thermal management (cooling, heating, etc.), perform high-voltage interlock functions, and detect insulation and short-circuit conditions.

[0065] Here, the relay control can be a function that cuts off the power supply from the battery when a problem occurs in the vehicle or battery system. One or more relays and precharge relays can be provided at each of the positive and negative terminals. The high voltage interlock function can be a function that forcibly opens the relay if an open occurs at any point on the entire loop.

[0066] As described above, according to the present invention, by configuring a protection circuit module so that the elements are arranged in the following order: connector-fuse-overvoltage protection element, the inductance component of the protection circuit module can be reduced and the overvoltage protection performance of the protection circuit module can be improved.

[0067] The embodiments described herein may be implemented, for example, in a method or process, an apparatus, a software program, a data stream, or a signal. Even if described in the context of a single embodiment (e.g., described only as a method), the implementation of the described features may also be implemented in other forms (e.g., an apparatus or a program). An apparatus may be implemented in appropriate hardware, software, firmware, and the like. A method may be implemented in an apparatus such as, for example, a processor, which generally refers to a processing device including a computer, a microprocessor, an integrated circuit, or a programmable logic device, and the like. A processor also includes a communication device such as a computer, a mobile phone, a portable / personal digital assistant (PDA), and another device that facilitates communication of information between end users.

[0068] The present invention has been described with reference to the embodiments shown in the drawings, but these are merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible. Therefore, the technical scope of the present invention should be determined by the claims. [Explanation of symbols]

[0069] 100: Protection circuit module 110: Substrate 120: Connector 130: Overvoltage protection element 140: Fuse 150: Conductive area 151: First conductive via 152: second conductive via 153: First conductive line 154: Second conductive line 155: 3rd conductive line 160: Grounding area 200:AFE IC

Claims

1. a substrate having a first surface and a second surface formed thereon; a connector disposed on the first surface and electrically connected to a battery cell; an overvoltage protection element disposed on the second surface and electrically connected to the connector; a fuse disposed on the first surface and electrically connected to the overvoltage protection element.

2. The substrate is first and second conductive vias extending through the first and second faces; a first conductive line disposed on the second surface and electrically connected to the first and second conductive vias; a second conductive line disposed on the first surface and electrically connected to the second conductive via.

3. The protection circuit module of claim 2 , wherein the connector is electrically connected to the first conductive via.

4. The protection circuit module of claim 2 , wherein the overvoltage protection element is electrically connected to the first conductive line.

5. The substrate further includes a ground disposed on the second surface, The protection circuit module of claim 4 , wherein the overvoltage protection element is electrically connected to the ground.

6. The protection circuit module of claim 2 , wherein the fuse is electrically connected to the second conductive line.

7. The display further includes an analog front end integrated circuit (AFE IC) disposed on the first surface, The protection circuit module of claim 2 , wherein the AFE IC is electrically connected to the fuse.

8. The protection circuit module according to claim 1 , wherein the overvoltage protection element includes a TVS (Transient Voltage Suppressor).

9. A battery cell; AFE IC (Analog Front End Integrated Circuit) and a protection circuit module electrically connecting the battery cell and the AFE IC and protecting the AFE IC from electrostatic discharge; The protection circuit module includes: a substrate having a first surface and a second surface formed thereon; a connector disposed on the first surface and electrically connected to a battery cell; an overvoltage protection element disposed on the second surface and electrically connected to the connector; a fuse disposed on the first surface and electrically connected to the overvoltage protection element.

10. The substrate is first and second conductive vias extending through the first and second faces; a first conductive line disposed on the second surface and electrically connected to the first and second conductive vias; a second conductive line disposed on the first surface and electrically connected to the second conductive via.

11. The battery pack of claim 10 , wherein the connector is electrically connected to the first conductive via.

12. The battery pack of claim 10 , wherein the overvoltage protection element is electrically connected to the first conductive line.

13. The substrate further includes a ground disposed on the second surface, The battery pack according to claim 12 , wherein the overvoltage protection element is electrically connected to the ground.

14. The battery pack of claim 10 , wherein the fuse is electrically connected to the second conductive line.

15. The battery pack of claim 9 , wherein the overvoltage protection element includes a Transient Voltage Suppressor (TVS).

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