Protection circuit module and battery pack including same

Abstract

The invention provides a protection circuit module and a battery pack including the same. The protection circuit module includes a substrate having a first surface and a second surface, a connector disposed on the first surface and electrically connected to the battery cell, an overvoltage protection element disposed on the second surface and electrically connected to the connector, and a fuse disposed on the first surface and electrically connected to the overvoltage protection element. The protection circuit module effectively protects a battery management device (analog front end integrated circuit, AFE IC) from electrostatic discharge.

Description

Technical Field

[0001] Aspects of embodiments of the present disclosure are directed to a protection circuit module capable of protecting a battery management device from electrostatic discharge, and a battery pack including the protection circuit module. Background Art

[0002] A battery pack is usually composed of a plurality of battery cells connected in series. It is necessary to periodically monitor the current, voltage, temperature, etc. of each of the plurality of battery cells constituting the battery pack to ensure the normal operation of the battery pack. In order to monitor each of the plurality of battery cells, the battery pack is provided with sensing lines. These sensing lines are connected to the protection circuit module through a connector.

[0003] A protection circuit module may be connected to the sensing line to protect the IC monitoring each of the plurality of battery cells from hazards such as overvoltage, overcurrent, etc. The protection circuit module may include many passive components such as overvoltage protection elements, fuses, and resistors to increase robustness against electrostatic discharge (ESD).

[0004] On the other hand, when many passive components are arranged on the board of the protection circuit module, the distance between the connector and the overvoltage protection component increases. The increased distance between the connector and the overvoltage protection component may cause the performance of the protection circuit module to deteriorate.

[0005] This section is only intended to provide a better understanding of the background of the invention and therefore may contain information that is not necessarily prior art. Summary of the invention

[0006] Embodiments of the present disclosure provide a protection circuit module and a battery pack including the protection circuit module, which enables a battery management device (analog front end integrated circuit, AFE IC) to be effectively protected from electrostatic discharge.

[0007] The above and other aspects and features of the present invention will become apparent from the following description of embodiments of the present invention.

[0008] According to aspects of the present disclosure, a protection circuit module includes a connector and a fuse disposed on a first surface of a substrate, and an overvoltage protection element disposed on a second surface of the substrate, wherein the overvoltage protection element electrically connects the connector and the fuse through a conductive path.

[0009] According to an embodiment of the present disclosure, the protection circuit module has a circuit configuration in the order of a connector, a fuse, and an overvoltage protection element to reduce the inductance component of the protection circuit module, thereby achieving improvement in overvoltage protection performance of the protection circuit module.

[0010] However, aspects and features of the present invention are not limited to the above, and other aspects and features not mentioned will be clearly understood by those skilled in the art from the detailed description given below. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The following drawings attached to this specification illustrate embodiments of the present invention and, together with the detailed description of the present invention, further describe aspects and features of the present invention. Therefore, the present invention should not be interpreted as being limited to the drawings:

[0012] Figure 1 is a side view of a protection circuit module according to an embodiment of the present invention;

[0013] Figure 2 is a top view of a protection circuit module according to an embodiment of the present invention;

[0014] Figure 3 is a bottom view of a protection circuit module according to an embodiment of the present invention;

[0015] Figure 4 is a circuit diagram including an overvoltage protection element according to an embodiment of the present invention;

[0016] Figure 5 It is a circuit diagram of a conventional protection circuit module;

[0017] Figure 6 is a circuit diagram of a protection circuit module according to an embodiment of the present invention; and

[0018] Figure 7 is a block diagram of a battery pack according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] Hereinafter, the exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The terms or words used in this specification and claims should not be interpreted as being limited to the usual meaning or dictionary meaning, and should be interpreted as having a meaning and concept consistent with the technical concept of the present invention, based on the concept that the inventor can be his / her own lexicon compiler to appropriately define the term to explain the principle of his / her invention in the best way. The embodiments described in this specification and the configurations shown in the accompanying drawings are only some embodiments of the present invention, and do not represent all technical ideas, aspects and features of the present invention. Therefore, it should be understood that there may be various equivalents and modifications, which may replace or modify the embodiments described herein when submitting this application. It will be further understood that when used in this specification, the terms "includes", "including", "comprises" and / or "comprising" specify the presence of the features, wholes, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, parts and / or their groups. In addition, when describing an embodiment of the present invention, the use of "may" relates to "one or more embodiments of the present invention".

[0020] In the drawings, the sizes of various elements, layers, etc. may be exaggerated for clarity of illustration. The same reference numerals denote the same elements.

[0021] Reference to two compared elements, features, etc. as being "the same" may mean that they are "substantially the same." Thus, the phrase "substantially the same" may include situations with deviations that are considered low in the art (e.g., 5% or less). Additionally, when a parameter is referred to as being uniform in a given area, it may mean that it is uniform in terms of average value.

[0022] It should be understood that although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are used to distinguish an element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer or part discussed below can be referred to as a second element, component, region, layer or part.

[0023] Throughout the specification, unless otherwise specified, each element may be in the singular or in the plural.

[0024] When any element is referred to as being disposed (or positioned or located) "on" (or "under") or "on" (or "below") a component, it may mean that the arbitrary element is placed in contact with the upper (or lower) surface of the component, and may also mean that another component may be interposed between the component and any arbitrary element disposed (or positioned or located) on (or under) the component.

[0025] In addition, it should be understood that when an element is referred to as being "coupled", "linked" or "connected" to another element, the elements may be directly "coupled", "linked" or "connected" to each other, or there may be an intermediate element between them, through which the element may be "coupled", "linked" or "connected" to another element. In addition, when a component is referred to as being "electrically coupled" to another component, the component may be directly connected to the other component, or there may be an intermediate component therebetween, so that the component and the other component are indirectly connected to each other.

[0026] Throughout the specification, unless otherwise specified, when "A and / or B" is stated, it means A, B, or A and B. That is, "and / or" includes any or all combinations of the listed multiple items. When "C to D" is stated, unless otherwise specified, it means C or greater and D or less.

[0027] Reference Figures 1 to 3 , a protection circuit module 100 according to one embodiment of the present invention may include a substrate 110, a connector 120, at least one overvoltage protection element 130, 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 overvoltage protection elements 130 and five fuses 140.

[0028] The substrate 110 may have at least one electronic component mounted thereon. According to one embodiment, the substrate 110 may be a hard printed circuit board or a flexible printed circuit board. According to one embodiment, the substrate 110 may be a double-sided printed circuit board or a multi-layer printed circuit board.

[0029] The substrate 110 may include a plurality of layers. The plurality of layers may include a first outer layer formed on a first surface 110A of the substrate 110, and a second outer layer formed on a second surface 110B of the substrate 110 opposite to the first surface 110A of the substrate 110. The first surface 110A may be an upper surface of the substrate 110. The second surface 110B may be a lower 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.

[0030] The substrate 110 may include at least one insulating layer. The insulating layer may be disposed between layers in which conductive regions are formed to prevent interlayer current from flowing in regions other than conductive paths. The insulating layer may be formed of an insulating material.

[0031] The substrate 110 may include a conductive region 150. The conductive region 150 may be provided in at least one of a plurality of layers included in the substrate 110. The conductive region 150 may be provided 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.

[0032] According to one embodiment, the conductive region 150 may be formed of copper, aluminum, silver, tin, gold, nickel, lead, titanium or alloys thereof. However, it should be understood that the material for the conductive region 150 is not limited thereto and the conductive region 150 may be formed of various conductive materials.

[0033] According to one embodiment, the conductive region 150 may include at least one first conductive path 151, at least one second conductive path 152, at least one first conductive wire 153, at least one second conductive wire 154, and at least one third conductive wire 155. The substrate 110 may include as many first conductive paths 151, second conductive paths 152, first conductive wires 153, second conductive wires 154, and third conductive wires 155 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 substrate 110 may include five of each of the first conductive path 151, the second conductive path 152, the first conductive wire 153, the second conductive wire 154, and the third conductive wire 155.

[0034] The first conductive path 151 may be formed to extend through the first surface 110A and the second surface 110B of the substrate 110. The first conductive path 151 may be formed in a region below or around a region where the connector 120 is disposed. The first conductive path 151 may be connected to the connector 120.

[0035] The second conductive path 152 may be formed to extend through the first surface 110A and the second surface 110B of the substrate 110. The second conductive path 152 may be formed at a position spaced apart from the first conductive path 151 by a predetermined distance in the longitudinal direction of the substrate 110.

[0036] 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 the second outer layer of the substrate 110. The first conductive line 153 may also be disposed on the inner layer of the substrate 110. The first conductive line 153 may be connected to the first conductive path 151 at one end thereof and to the second conductive path 152 at the other end thereof. The first conductive line 153 may be connected to the overvoltage protection element 130.

[0037] The second conductive line 154 may be disposed on the first surface 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 to the second conductive path 152 at one end thereof and to the fuse 140 at the other end thereof.

[0038] 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 the first outer layer of the substrate 110. The third conductive line 155 may also be disposed on the inner layer of the substrate 110. The third conductive line 155 may be connected to the fuse 140 at one end thereof, and connected to an analog front end integrated circuit (AFE IC) 200 at the other end thereof. The AFEIC 200 may detect at least one of the temperature, voltage, and current of each battery cell connected to the connector 120, and may output the detection result to an external device (e.g., a controller of a battery management device).

[0039] The substrate 110 may include a grounding region (grounding) 160. The grounding region 160 may be disposed on the second surface 110B of the substrate 110. The grounding region 160 may be disposed on the second outer layer of the substrate 110. The grounding region 160 may also be disposed on the inner layer of the substrate 110. According to one embodiment, the grounding region 160 may be formed at a position spaced apart from the first conductive line by a predetermined distance in the longitudinal direction of the substrate 110.

[0040] The connector 120 may be disposed on the first surface 110A of the substrate 110. The connector 120 may be disposed on the 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 at least one battery cell to 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 via a conductive 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 a first conductive path 151.

[0041] 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 one embodiment, the overvoltage protection element 130 may include a transient voltage suppressor (TVS) diode. However, it should be understood that the overvoltage protection element 130 is not limited thereto, and various devices capable of limiting the voltage applied to the connector 120 may be used as the overvoltage protection element 130.

[0042] When a voltage of a preset magnitude or more is applied, the overvoltage protection element 130 may be turned on. Depending on the turning on of the overvoltage protection element 130, a portion of the voltage applied to the connector 120 may be 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 be connected to the first conductive line 153 at one end thereof and to the ground region 160 at the other end thereof.

[0043] The fuse 140 may be disposed on the first surface 110A. The fuse 140 may be disposed on the first outer layer. When a current exceeding a preset threshold is applied thereto (i.e., when an overcurrent occurs), the fuse 140 may be melted and disconnected to protect the AFE IC 200 from the overcurrent. The fuse 140 may be connected to the second conductive line 154 at one end thereof and to the third conductive line 155 at the other end thereof.

[0044] Figure 4 is a circuit diagram including an overvoltage protection element according to an embodiment of the present invention.

[0045] refer to Figure 4 , in a circuit in which the overvoltage protection element 420 is connected between the connector 410 and the AFE IC 430, if a voltage due to electrostatic discharge (ESD) is applied to the connector, a voltage (voltage at the node A) applied to the AFE IC 430 may be defined by Equation 1:

[0046]

[0047] Here, V ESD is the voltage applied to the AFE IC 430 due to electrostatic discharge (the voltage at the node A), 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), R DYN_TVS is the internal resistance of the overvoltage protection element 420, I ESD is the current flowing in the overvoltage protection element 420, and L may represent the inductance of the entire circuit.

[0048] It can be seen from Equation 1 that when the inductance components L1, L3 of the protection circuit module 400 increase, the voltage V applied to the AFE IC 430 during electrostatic discharge is ESD 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.

[0049] Figure 5 This is the circuit diagram of a traditional protection circuit module. Figure 5 The protective circuit module 500 in which the connector 510, the fuse 520, and the overvoltage protection element 530 are all disposed on the upper surface of the substrate has a circuit configuration in the order of the connector 510, the fuse 520, the overvoltage protection element 530, and the AFE IC 540. Figure 5 In the circuit configuration shown, the protection circuit module 500 has a significant distance between the connector 510 and the overvoltage protection element 530, resulting in an increase in the inductance component L1 of the circuit. Figure 5 The protection circuit module 500 of the illustrated circuit configuration requires a separate conductive path to connect the overvoltage protection element 530 disposed on the upper surface of the substrate to the ground region disposed on the lower surface of the substrate, thereby increasing the inductance component L3 of the circuit.

[0050] Table 1

[0051]

[0052] Table 1 shows voltages measured at the AFE IC 540 when an electrostatic discharge voltage of 27 kV is applied to the protection circuit module 500. As can be seen from Table 1, when an electrostatic discharge voltage of 27 kV is applied to three terminals included in the connector 510, a maximum value of 2247 V is applied to the AFE IC 540 in the protection circuit module 500.

[0053] Figure 6 6 is a circuit diagram of a protection circuit module according to an embodiment of the present invention. 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 has a circuit configuration in the order of the connector 610, the overvoltage protection element 620, the fuse 630 and the AFE IC 640, as shown in FIG. Figure 6As shown. Compared with a typical circuit, the protection circuit module 600 can reduce the distance between the connector 610 and the overvoltage protection element 620, thereby reducing the inductance component L1 of the circuit. In addition, since the overvoltage protection element 620 and the grounding area are both disposed on the lower surface of the substrate, the protection circuit module 600 does not require a separate conductive path to connect the overvoltage protection element 620 to the grounding area, thereby reducing the inductance component L3 of the circuit. In this way, by reducing the inductance component of the protection circuit module 600, the protection circuit module 600 can reduce the voltage applied to the AFE IC 640 in the event of electrostatic discharge.

[0054] Table 2

[0055]

[0056]

[0057] Table 2 shows the voltage measured at the AFE IC 640 when the electrostatic discharge voltage of 27 kV is applied to the protection circuit module 600 according to this embodiment. As can be seen from Table 2, when the electrostatic discharge voltage of 27 kV is applied to the three terminals included in the connector 610, a maximum value of 1895 V is applied to the AFE IC 640 in the protection circuit module 600.

[0058] Figure 7 is a block diagram of the battery pack. Figure 7 , the battery pack 700 according to one embodiment of the present invention has a structure capable of being electrically connected to an external device through a cathode connection terminal P(+) and an anode connection terminal P(-). When the external device is a load, the battery pack 700 discharges by acting as a power source to provide power to the load. The external device operating as a load may be, for example, an electronic device, a mobile vehicle, or an energy storage system (ESS). Here, the mobile vehicle may be, for example, an electric vehicle, a hybrid vehicle, or a smart mobile device.

[0059] The battery pack 700 may include a plurality of battery cells 710, a protection circuit module 720, and an AFE IC 730. Obviously, in various embodiments, the battery pack 700 may further include other components.

[0060] A plurality of battery cells 710 may be connected in series or in parallel to each other to constitute at least one battery module. A battery module may include a plurality of battery cells 710 and a module housing. The battery modules may be connected in series or in parallel to each other.

[0061] The battery cells 710 may be stacked and accommodated in a module housing. The battery cells 710 may include a cathode lead and an anode lead. The battery cells 710 may be circular, prismatic, or pouch-type battery cells depending on the shape of the battery.

[0062] The battery pack 700 may include a single battery stack stacked to form a single module instead of a plurality of battery modules. The battery stack may be accommodated in an accommodation space of a battery pack case, or in an accommodation space partitioned by a frame, a partition wall, or the like.

[0063] The battery cell 710 may generate a large amount of heat during charging / discharging. The generated heat may be accumulated in the battery cell 710 to promote degradation of the battery cell 710. Therefore, the battery pack 700 may further include a cooling member to suppress degradation of the battery cell 710. The cooling member may be provided at the lower portion of the accommodation space accommodating the battery cell 710. Alternatively, the cooling member may be provided at the upper portion or side surface thereof according to the battery pack.

[0064] Exhaust gas generated inside the battery cell 710 due to abnormal operating conditions (also referred to as thermal runaway or thermal events in the battery cell 710) may be exhausted from the battery cell 710. The battery pack 700 or the battery module may include an exhaust port or the like for exhausting the exhaust gas to suppress damage to the battery pack 700 or the module due to the exhaust gas.

[0065] The protection circuit module 720 may be a device for protecting the AFE IC 730 from dangers 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 in a path connecting the plurality of battery cells 710 and the AFE IC 730.

[0066] The AFE IC 730 may detect at least one of the temperature, voltage, and current of each battery cell 710 connected to the connector, and may output the detection result to an external source (e.g., a battery management device). The AFE IC 730 may correspond to a component constituting the battery management device. The AFE IC 730 may transmit information about the result of detecting at least one of the temperature, voltage, and current of each battery cell 710 to other components of the battery management device (e.g., a balancing device, a control device). The AFE IC 730 may be electrically connected to the protection circuit module 720.

[0067] The battery pack 700 may include batteries and a battery management system (BMS) for managing the batteries. The battery management device may include a detection device, a balancing device, and a control device.

[0068] The detection device may sense the state (voltage, current, temperature, etc.) of the battery and detect state information indicating the state of the battery. The AFE IC 730 may correspond to the detection device. The detection device may detect the voltage of each cell or each battery module constituting the battery. The detection device may also detect the current flowing in the battery module or in each of the plurality of battery modules constituting the battery pack 700. The detection device may detect the cell, module and / or ambient temperature at at least one point of the battery.

[0069] The balancing device may perform balancing operations of the battery modules and / or cells constituting the battery. The control device may receive status information (voltage, current, temperature, etc.) of the battery module from the detection device. The control device may monitor and calculate the status (voltage, current, temperature, state of charge (SOC), state of health (SOH), etc.) of the battery module based on the status information received from the detection device. Based on the status monitoring results, the control device may perform control functions (e.g., temperature control, balancing control, charge / discharge control, etc.), protection functions (e.g., over-discharge protection, over-charge protection, over-current protection, short-circuit protection, fire extinguishing, etc.), etc.

[0070] The control unit may perform a wired or wireless communication function with an external device (eg, a high-level controller or vehicle, charger, PCS, etc.) of the battery pack 700. The control device may also control the charging / discharging operation and protection operation of the battery.

[0071] A battery management device is a system that monitors battery status, performs diagnostic and control, communication and protection functions, and can calculate charge / discharge status, calculate battery life or state of health (SOH), cut off battery power as needed (relay control), control thermal management (cooling, heating, etc.), perform high-voltage interlock functions, and detect insulation and short-circuit conditions.

[0072] Here, the relay control may be a function of cutting off the power supply from the battery in the event of a problem with the vehicle and battery system. Each of the cathode and anode may be provided with one or more relays and a pre-charge relay. The high voltage interlock function may be a function of forcing the relay to disconnect when there is a disconnection in the entire circuit.

[0073] As described above, according to the present invention, the protection circuit module has a circuit configuration in the order of connector-fuse-overvoltage protection element to reduce the inductance component of the protection circuit module, thereby improving the overvoltage protection performance of the protection circuit module.

[0074] Here, the embodiments described herein may be implemented as, for example, methods or processes, devices, software programs, data streams or signals. Although discussed in the context of a single type of implementation (e.g., discussed only as a method), the features discussed herein may also be implemented in other forms (e.g., devices or programs). The device may be implemented by suitable hardware, software, firmware, etc. The method may be implemented on a device, such as a processor, which generally refers to a processing device including a computer, a microprocessor, an integrated circuit, a programmable logic device, etc. The processor includes a communication device, such as a computer, a cellular phone, a personal digital assistant (PDA), and other devices that facilitate information communication between the device and the end user.

[0075] Although the present invention has been described with reference to some embodiments and drawings showing aspects of the present invention, the present invention is not limited thereto. Those skilled in the art to which the present invention pertains may make various modifications and changes within the scope of the technical spirit of the present invention and claims and their equivalents.

Claims

1. A protection circuit module, comprising: a substrate having a first surface and a second surface; a connector disposed on the first surface and electrically connected to the battery cell; an overvoltage protection element disposed on the second surface and electrically connected to the connector; as well as A fuse is disposed on the first surface and is electrically connected to the overvoltage protection element.

2. The protection circuit module according to claim 1, wherein the substrate includes a first conductive path and a second conductive path extending through the first surface and the second surface; a first conductive line disposed on the second surface and electrically connected to the first conductive path and the second conductive path; and a second conductive line disposed on the first surface and electrically connected to the second conductive path. 3 . The protection circuit module according to claim 2 , wherein the connector is electrically connected to the first conductive path. 4 . The protection circuit module according to claim 2 , wherein the overvoltage protection element is electrically connected to the first conductive line.

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

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

7. The protection circuit module according to claim 2, further comprising: An analog front end integrated circuit (AFE IC) is disposed on the first surface and electrically connected to the fuse.

8. The protection circuit module of claim 1, wherein the overvoltage protection element comprises a transient voltage suppressor (TVS).

9. A battery pack comprising: Battery cells; Analog front-end integrated circuit (AFE IC); as well as a protection circuit module, electrically connecting the battery cell to the AFE IC and protecting the AFE IC from electrostatic discharge, Wherein, the protection circuit module comprises: a substrate having a first surface and a second surface; a connector disposed on the first surface and electrically connected to the battery cell; an overvoltage protection element disposed on the second surface and electrically connected to the connector; and A fuse is disposed on the first surface and is electrically connected to the overvoltage protection element.

10. The battery pack according to claim 9, wherein: The substrate includes a first conductive path and a second conductive path extending through the first surface and the second surface; a first conductive line disposed on the second surface and electrically connected to the first conductive path and the second conductive path; and a second conductive line disposed on the first surface and electrically connected to the second conductive path.

11. The battery pack according to claim 10, wherein: The connector is electrically connected to the first conductive path. 12 . The battery pack according to claim 10 , wherein the overvoltage protection element is electrically connected to the first conductive line. 13 . The battery pack according to claim 12 , wherein the substrate further comprises a ground region disposed on the second surface, and the overvoltage protection element is electrically connected to the ground region.

14. The battery pack according to 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 comprises a transient voltage suppressor (TVS).

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