Easily detachable battery pack

Abstract

The present invention relates to an easily detachable battery pack and, more specifically, to an easily detachable battery pack comprising: a battery cell having a first electrode and a second electrode; a first connector extended by having one side electrically connected to the first electrode; a first terminal connected to the other side of the first connector; a second connector extended by having one side electrically connected to the second electrode; a second terminal connected to the other side of the second connector; a third connector extended by having one side connected to a part of the first connector; and a third terminal connected to the other side of the third connector, wherein the third connector has a constant power load element.

Description

Easy-to-removable battery pack

[0001] This application claims the benefit of priority to Korean Patent Application No. 2023-0174917, filed December 5, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a battery pack that is easily removable. Specifically, the invention relates to a battery pack that is easily removable by forcibly expanding the battery pack by inducing heat generation due to a short circuit when replacing the battery pack attached to a device.

[0003] Conventional mobile phones had user-replaceable batteries. These batteries were essentially separate battery packs, typically pouch-shaped or square, with an external plastic case. Users could easily replace the batteries by disassembling the mobile phone.

[0004] Small electronic devices, such as smartphones, that use pouch-type batteries are manufactured with the pouch-type batteries embedded. Due to issues such as waterproofing and dustproofing, it is difficult to disassemble the case of the small electronic device by welding it with ultrasonic waves or lasers. The embedded battery pack or pouch-type battery may also be connected to a PCB as an internal component. Separating the pouch-type battery from the electronic device is also difficult due to the addition of adhesive or string-type adhesive tape to one side of the pouch-type battery for internal fixation. There is also a risk of fire due to physical damage to the pouch-type battery during the process of separating the pouch-type battery from the electronic device.

[0005] Recent electronic devices, including smartphones, are designed to make it extremely difficult for users to replace their batteries themselves. When the battery's lifespan ends, it's common to either repair the entire device or replace the battery entirely.

[0006] Although electronic devices can continue to function by simply replacing the battery, repairing or replacing the entire device is undesirable from a recycling and environmental perspective. Recently, countries like Europe have been improving regulations to allow users to easily replace built-in pouch-type batteries, even if they are not included.

[0007] Batteries built into smartphones and other devices are often in the form of battery packs, which are pouch-shaped batteries with a protection circuit and wrapped in film or the like. In the case of very simple, small devices, pouch-shaped batteries may be directly connected to the electronic device without a protection circuit. Although not in the form of a battery pack, there are also cases where a simple protection circuit is attached to a pouch-shaped battery. The battery pack mentioned in the present invention is characterized by its easy detachment, and to achieve this, a basic circuit must be configured. Therefore, not only a conventional battery pack, but also a pouch-shaped battery with a simple circuit attached to it is referred to as a battery pack in the present invention.

[0008] Figure 1 is a perspective view showing a battery pack according to the prior art and a detachable tape attached thereto. A separate detachable tape for the purpose of detaching the battery pack is attached to the battery pack so that the user can easily replace the battery pack. When the protruding portion of the battery pack's connection is positioned as the upper surface (xz plane), the detachable tape is attached to surround the front, both sides, and the rear of the battery pack. A handle is provided on one side of the detachable tape so that the user can easily remove the detachable tape. Since the detachable tape is intended for detachment, the adhesive strength of the detachable tape is not high, and the adhesive strength of the front, both sides, and the rear may vary. An adhesive or adhesive tape for fixing the battery pack to an electronic device is attached to the detachable tape. That is, when the handle is held and the detachable tape is removed from the battery pack, the adhesive or adhesive tape fixing the battery pack to the electronic device is also detached. This allows the battery pack to be easily detached from the electronic device.

[0009] The above-mentioned removal tape must be attached separately to the battery pack, and some processes such as rear adhesion can be automated when using a conveyor belt, but side and front adhesion are currently attached manually as there is no separate method.

[0010] Furthermore, even if a removal tape is attached, the adhesive strength between the removal tape and the battery pack, and between the removal tape and the fixing adhesive, must be different. This uneven design adhesive strength can fluctuate over time and can also be affected by heat generated from the electronic device, ultimately preventing the intended removal and removal.

[0011] Patent Document 1 discloses a mounting portion on which a battery is mounted, a first tape attachment device for attaching tape to both sides of the battery, a second tape attachment device for attaching tape to the upper surface of the battery, a transport rail for horizontally moving attachment members of the first and second tape attachment devices, and a worktable on which the first and second tape attachment devices are mounted.

[0012] Patent Document 1 attaches tape to both sides of the battery, but has a problem in that if the tape is damaged when tension is applied during the battery removal and installation process, it becomes difficult to remove the battery.

[0013] Patent Document 2 discloses a battery pack including a positive terminal, a negative terminal, and a plurality of positive discharge terminals and negative discharge terminals, but does not disclose a configuration corresponding to the electrostatic load element of the present invention that causes a short circuit to expand the battery pack and facilitates removal.

[0014] Patent Document 2 discloses a battery pack equipped with a load device that discharges static electricity, but it is different from the static electricity load element that causes a short circuit of the present invention.

[0015] (Prior art literature)

[0016] (Patent Document 1) Republic of Korea Patent Publication No. 2016756

[0017] (Patent Document 2) Republic of Korea Patent Publication No. 1419113

[0018] (Patent Document 3) Japanese Patent Publication No. 2015-81773

[0019] The present invention is intended to solve the above-mentioned problems, and aims to provide a battery pack that can be easily removed from an electronic device when the battery pack requires replacement due to a decrease in performance and capacity.

[0020] Specifically, the purpose is to provide a battery pack that is easy to remove without a separate removal tape.

[0021] In order to achieve the above purpose, a battery pack according to the present invention includes a battery cell (100) having a first electrode (110) and a second electrode (120), a first connector (200) having one end electrically connected to the first electrode (110) and extended, a first terminal (300) connected to the other end of the first connector (200), a second connector (400) having one end electrically connected to the second electrode (120) and extended, a second terminal (500) connected to the other end of the second connector (400), a third connector (600) having one end connected to a part of the first connector (200) and extended, and a third terminal (700) connected to the other end of the third connector (600), wherein a static power load element (610) is provided in the third connector (600).

[0022] The above first electrode (110) may be an anode, and the above second electrode (120) may be a cathode.

[0023] The above-mentioned constant power load element (610) has substantially no resistance during normal operation, and may be provided with a function of blocking the flow of current when the current flowing through the third connector (600) reaches a preset amount of power.

[0024] The above-mentioned electrostatic load element (610) has substantially no resistance during normal operation, and may be provided with a function of blocking the current flowing to the third connector (600) when the temperature of the battery cell (100) reaches a preset temperature value.

[0025] The above-mentioned static power load element (610) may be equipped with a fuse that breaks at a certain temperature or higher.

[0026] Pull tape may be added for separation of the battery pack.

[0027] The present invention provides a device including the above-described battery pack.

[0028] The present invention provides a method for separating a battery pack from a device including the aforementioned battery pack, wherein the method comprises separating the battery pack by electrically connecting the second terminal (500) and the third terminal (700).

[0029] The second terminal (500) and the third terminal (700) can be electrically connected by a separate connecting member.

[0030] The above third terminal (700) can be configured in a form that can be electrically connected only by the separate connecting member.

[0031] The present invention can also be provided in a form in which various means for solving the above problem are combined.

[0032] As described above, the present invention induces heat generation by electrically connecting the second terminal and the third terminal to a short circuit, thereby causing the battery cells inside the battery pack to expand, and ultimately causing the battery pack to expand and be easily separated from the electronic device.

[0033] In addition, the present invention has the advantage of being configured without the detachable tape used in the prior art and reducing the cost of replacing the battery pack by using a connecting member that can be used multiple times.

[0034] Figure 1 is a perspective view showing a battery pack according to the prior art and a detachable tape attached thereto.

[0035] Figure 2 is a schematic diagram showing a battery pack according to the first embodiment of the present invention.

[0036] Figure 3 is a schematic diagram showing a battery pack according to a second embodiment of the present invention.

[0037] FIG. 4 is a flowchart of a method for separating a battery pack from a device including a battery pack according to an embodiment of the present invention.

[0038] Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail, so that those with ordinary skill in the art can easily implement the present invention. However, when describing the operating principles of preferred embodiments of the present invention in detail, if it is determined that specific descriptions of related known functions or components may unnecessarily obscure the gist of the present invention, such detailed descriptions will be omitted.

[0039] Additionally, the same drawing reference numerals are used for parts with similar functions and actions throughout the drawings. Throughout the specification, when a part is said to be connected to another part, this includes not only direct connections but also indirect connections with other elements intervening. Furthermore, inclusion of a component does not exclude other components unless specifically stated otherwise, but rather implies the inclusion of additional components.

[0040] Hereinafter, a battery pack that is easily removable according to the present invention will be described with reference to the attached drawings.

[0041] Figure 2 is a schematic diagram showing a battery pack according to the first embodiment of the present invention.

[0042] Referring to FIG. 2, a battery pack according to a first embodiment of the present invention is configured to include a battery cell (100), a first connector (200), a first terminal (300), a second connector (400), a second terminal (500), a third connector (600), and a third terminal (700).

[0043] The battery cell (100) is a pouch-type battery cell, and includes a cell case that accommodates an electrode assembly (not shown), and a pair of electrode leads each connected to a positive electrode tab and a negative electrode tab of the electrode assembly.

[0044] The cell case can be formed using a laminate sheet including an inner resin layer, a metal layer, and an outer resin layer.

[0045] Since the inner resin layer comes into direct contact with the electrode assembly, it must have insulation and electrolytic resistance, and in order to seal it from the outside, the sealing area where the inner layers are thermally bonded must have excellent thermal bonding strength.

[0046] Materials for the internal resin layer may be selected from, but are not limited to, polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, polybutylene, acid-modified polypropylene, polyurethane resins, and polyimide resins that have excellent chemical resistance and sealing properties, and polypropylene that has excellent mechanical properties such as tensile strength, rigidity, surface hardness, impact strength, and chemical resistance is most preferable.

[0047] The metal layer in contact with the inner resin layer serves as a barrier layer that prevents moisture or various gases from penetrating into the battery from the outside. A preferred material for this metal layer is an aluminum film that is lightweight and has excellent formability.

[0048] And, an external resin layer is provided on the other side of the metal layer, and this external resin layer can use a heat-resistant polymer with excellent tensile strength, moisture permeability, and air permeability to protect the electrode assembly while ensuring heat resistance and chemical resistance. For example, nylon or polyethylene terephthalate can be used, but is not limited thereto.

[0049] The electrode assembly may be formed of, but is not limited to, a jelly-roll type electrode assembly having a structure in which a separator is interposed between long sheet-shaped cathodes and anodes and then rolled up, a stack type electrode assembly having unit cells in which rectangular cathodes and anodes are stacked with a separator interposed between them, a stack-folding type electrode assembly in which the unit cells are rolled up by a long separator film, or a lamination-stack type electrode assembly in which the unit cells are stacked with a separator interposed between them and attached to each other.

[0050] The negative electrode is manufactured by applying a slurry containing a negative electrode active material and a binder to a negative electrode current collector.

[0051] The negative electrode current collector is typically made to have a thickness of 3 to 500 μm. There are no particular limitations on the negative electrode current collector as long as it is conductive and does not cause chemical changes in the battery. For example, copper, stainless steel, aluminum, nickel, titanium, calcined carbon, copper or stainless steel surface-treated with carbon, nickel, charcoal, silver, etc., aluminum-cadmium alloy, etc. can be used.

[0052] Examples of negative active materials include carbon such as non-graphitizable carbon and graphitic carbon; Li x Fe2O3(0≤x≤1), Li x WO2(0≤x≤1), Sn x Me 1-x Me' y O z (Me: Mn, Fe, Pb, Ge; Me': Al, B, P, Si, elements of group 1, 2, and 3 of the periodic table, halogens; 0 <x≤1; 1≤y≤3; 1≤z≤8) 등의 금속 복합 산화물; 리튬 금속; 리튬 합금; 규소계 합금; 주석계 합금; SnO, SnO2, PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4, Bi2O5등의 금속 산화물; 폴리아세틸렌 등의 도전성 고분자; Li-Co-Ni계 재료; Si, SiO, SiO2단독 또는 이들의 혼합물인 Si계 등을 사용할 수 있으나, 이들만으로 한정되는 것은 아니다.

[0053] Of course, a conductive material and a binder can be additionally mixed with the negative electrode active material and coated on the negative electrode current collector.

[0054] The positive electrode is manufactured by applying a slurry containing a positive electrode active material and a binder to the positive electrode current collector.

[0055] The positive electrode current collector can generally have a thickness of 3 to 500 μm. There are no particular limitations on the material as long as it has high conductivity and does not cause chemical changes in the battery. For example, stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum or stainless steel surface-treated with carbon, nickel, titanium, silver, etc. can be used. In addition, in order to increase the adhesive strength of the positive electrode active material, the surface can be formed with fine irregularities, or various shapes such as films, sheets, foils, nets, porous bodies, foams, and non-woven bodies are possible.

[0056] The cathode active material may be a layered compound such as lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), or a compound substituted with one or more transition metals; chemical formula Li. 1+x Mn 2-x Lithium manganese oxides such as O4 (where x is 0 to 0.33), LiMnO3, LiMn2O3, LiMnO2; lithium copper oxide (Li2CuO2); vanadium oxides such as LiV3O8, V2O5, Cu2V2O7; chemical formula LiNi 1-x M x Ni-site type lithium nickel oxide represented by O2 (where M = Co, Mn, Al, Cu, Fe, Mg, B or Ga and x = 0.01 to 0.3); chemical formula LiMn 2-x M x Lithium manganese composite oxides represented by O2 (wherein, M = Co, Ni, Fe, Cr, Zn or Ta, and x = 0.01 to 0.1) or Li2Mn3MO8 (wherein, M = Fe, Co, Ni, Cu or Zn); LiMn2O4 in which a portion of the Li in the chemical formula is replaced by an alkaline earth metal ion; disulfide compounds; Fe2(MoO4)3, etc., but are not limited thereto.

[0057] The positive electrode active material may be mixed with a conductive agent and a binder, and if necessary, a filler may be added.

[0058] The separator prevents shorting between the aforementioned negative electrode and positive electrode and only allows the movement of lithium ions. The material of the separator is preferably one selected from among polyethylene, polypropylene, polyethylene / polypropylene double layer, polyethylene / polypropylene / polyethylene triple layer, polypropylene / polyethylene / polypropylene triple layer, and organic fiber filter paper, but is not limited thereto.

[0059] Meanwhile, the negative current collector and the positive current collector are composed of a portion where a slurry mixed with an active material is applied and a non-coated portion where the slurry is not applied. The non-coated portion is formed by cutting or connecting a separate conductive member to the non-coated portion by ultrasonic welding, etc. to form an electrode tab, and these electrode tabs are gathered to form a tab bundle.

[0060] The electrode leads, which are composed of a positive lead and a negative lead, are typically connected to the aforementioned tab bundle, more specifically, the positive tab bundle and the negative tab bundle, by welding or the like, and then protrude outside the cell case.

[0061] In the present invention, a pouch-type battery cell is mentioned as an example, but it can be replaced with a battery cell of another type and is not limited to a pouch-type battery cell.

[0062] A battery cell (100) is provided with a first electrode (110) on one side and a second electrode (120) on the other side. The first electrode (110) may be a positive electrode, and the second electrode may be (120).

[0063] Although the first electrode (110) and the second electrode (120) of the battery cell (100) in FIG. 2 are shown as having a structure in which they are provided in both directions, the structure may be formed in a state in which the first electrode (110) and the second electrode (120) are spaced apart from each other by a certain distance in one direction, if necessary.

[0064] The first connector (200) is connected to the first electrode (110) on one side and to the first terminal (300) on the other side to electrically connect the first electrode (110) and the first terminal (300). For example, it may be a wire wiring or a copper wire, and there are no particular limitations as long as it can electrically connect the first electrode (110) and the first terminal (200).

[0065] The first terminal (300) is connected to the first electrode (110) of the battery cell (100) housed in the battery pack by the first connector (200) and serves to connect the battery cell (100) and the device that are electrically connected to an external device.

[0066] The second connector (400) has one end connected to the second electrode (120) and the other end connected to the second terminal (500) to electrically connect the second electrode (120) and the second terminal (500). Like the first connector (200) described above, it may be, for example, a wire wiring or a copper wire, and is not particularly limited as long as it can electrically connect the second electrode (120) and the second terminal (500).

[0067] The second terminal (500) is connected to the second electrode (120) of the battery cell (100) housed in the battery pack by the second connector (400), is electrically connected to an external device, and serves to connect the battery cell (100) and the device.

[0068] Here, the first terminal (300) and the second terminal (500) are connected to the device and serve as terminals that supply power to the device when it is operating normally.

[0069] The third connector (600) is extended so that one side is connected to a part of the first connector (200), and the other side is connected to the third terminal (700), and no current flows when the battery pack is operating normally.

[0070] The third connector (600) is provided with a static power load element (610) between the part connected to the first connector (200) and the part connected to the third terminal (700).

[0071] The static power load element (610) has a third terminal (700) connected to another terminal, so that when current flows through the third connector (600), there is virtually no resistance in normal operation, and is provided with a function to block the flow of current when the amount of current flowing through the third connector (600) reaches a preset amount of power.

[0072] This function may be a function that blocks the current flowing through the connection line inside the static power load element (610) by disconnecting the connection, and has the advantage of preventing damage such as a fire occurring in the battery cell (100) due to excessive short-circuiting by blocking the current when a preset power amount is reached.

[0073] At this time, the preset power amount mentioned above may be a power amount lower than the power amount that may cause a fire while being able to expand the battery cell (100) to a state where it is easy to detach it, and the preset power amount may be set differently depending on the capacity of the battery cell (100), etc.

[0074] The third terminal (700) has one side connected to the third connector (600), is not normally connected to other terminals, but is electrically connected to the second terminal (500) when necessary. When electrically connected to the second terminal (500), a short circuit occurs in the battery cell (100).

[0075] Here, the third terminal (700) is provided in a state where it is not electrically connected to other terminals unless there is a separate connecting member in normal times, and accordingly, the third connector (600) can be provided in a state where no current flows.

[0076] This is because the third terminal (700) is electrically connected only when performing tasks such as repairing a battery pack due to an abnormality, replacing the battery pack, or removing the battery pack due to disposal of the device, thereby causing a short circuit.

[0077] In addition, it is preferable that the third terminal (700) not be exposed to the outside, because if it is exposed to the outside, it may come into contact with other parts, which may cause an unintended short circuit.

[0078] The battery pack according to the present invention may be provided with a pull tape to wrap around the front, both sides, and the rear for separating the battery pack, and has the advantage of being easy to detach by pulling the handle provided on the pull tape when the battery cell (100) expands due to a short circuit.

[0079] Figure 3 is a schematic diagram showing a battery pack according to a second embodiment of the present invention.

[0080] Referring to FIG. 3, the battery pack according to the second embodiment is identical to the battery pack according to the first embodiment described in FIG. 2 except that a temperature cutoff element (620) is provided in the third connector (600), and therefore, a description of the same configuration will be omitted.

[0081] A battery pack according to a second embodiment of the present invention comprises a battery cell (100), a first connector (200), a first terminal (300), a second connector (400), a second terminal (500), a third connector (600), and a third terminal (700).

[0082] The third connector (600) according to the second embodiment is equipped with a temperature cutoff element (620).

[0083] The temperature cutoff element (620) has virtually no resistance in normal operation when the second terminal (500) and the third terminal (700) are connected, and has a function of cutting off the current flowing to the third connector (600) when the temperature of the battery cell (100) reaches a preset temperature value.

[0084] The preset temperature value can be set to be lower than the temperature at which a fire occurs due to expansion of the battery cell (100) caused by a short circuit, thereby facilitating the removal of the battery cell (100) and preventing damage such as a fire caused by a short circuit.

[0085] At this time, the temperature cutoff element (620) may further be equipped with a temperature sensor (not shown) that can measure the temperature of the battery cell (100) in order to block the flow of current based on the temperature of the battery cell (100).

[0086] The temperature cutoff element (620) may have a structure equipped with a fuse to omit the temperature sensor, and the fuse may be applied with different thicknesses and materials depending on the degree of expansion to facilitate the detachment of the battery cell (100) and may perform the function of cutting off the current before a fire occurs in the battery cell (100).

[0087] FIG. 4 is a flowchart of a method for separating a battery pack from a device including a battery pack according to an embodiment of the present invention.

[0088] Referring to FIG. 4, a method for separating a battery pack from a device including a battery pack according to the present invention comprises a first step of determining whether the battery pack is to be replaced, a second step of electrically connecting a second terminal and a third terminal, and a third step of separating the battery pack while the second terminal and the third terminal are connected.

[0089] The first step in determining whether to replace the battery pack is to check whether the battery pack needs to be replaced by checking the state of capacity reduction, performance degradation, and defects such as lithium precipitation due to the period of use and number of charge / discharge cycles.

[0090] The second step of electrically connecting the second terminal and the third terminal is a step of electrically connecting the second terminal and the third terminal through a connecting member prepared separately from the battery pack.

[0091] The connecting member may be made of a material that conducts electricity, such as the first connector (200), the second connector (400), and the third connector (600), and is not particularly limited as long as it can electrically connect the second terminal and the third terminal.

[0092] The third terminal is normally provided in a state where it is not connected to the second terminal, and is configured in a form where electrical connection is possible only by a connecting member, and the connecting member can be configured with a minimum length greater than the distance between the second terminal and the third terminal.

[0093] The connecting member may be configured as a member with a rod shape that can be adjusted in length, and may be connected to one side of one of the second terminal and the third terminal, and may be structured so that the other side can be connected to another terminal that is not connected to the one side, by moving a certain radius based on the one side.

[0094] Additionally, the connecting member may be configured in a switch shape capable of controlling the electrical connection status of the second terminal and the third terminal.

[0095] That is, the second terminal and the third terminal are electrically connected by the connecting member when the battery pack needs to be removed by the connecting member, and the electrical connection of the second terminal and the third terminal causes volume expansion due to short circuit in the battery cell, making the battery pack easier to remove.

[0096] At this time, a static power load element or a temperature cutoff element is provided in the third connector to prevent a short circuit from occurring in the battery cell more than necessary, which may lead to a fire.

[0097] The third step of separating the battery pack while the second and third terminals are connected is the step of separating the battery cell while the battery cell is in a state where the volume has expanded due to a short circuit occurring in the battery cell due to the connection between the second and third terminals by the connecting member in the second step.

[0098] Battery cells that have expanded in volume due to a short circuit can be additionally separated using pull tape that wraps the battery cells.

[0099] The present invention may be a device including the aforementioned battery pack, and may be, for example, a smartphone or an electric kickboard.

[0100] Anyone with ordinary knowledge in the field to which the present invention pertains will be able to perform various applications and modifications within the scope of the present invention based on the above contents.

[0101] (Explanation of symbols)

[0102] 100: Battery cell

[0103] 110: First electrode

[0104] 120: Second electrode

[0105] 200: Connector 1

[0106] 300: Terminal 1

[0107] 400: Second connector

[0108] 500: Second terminal

[0109] 600: Third connector

[0110] 610: Constant power load element

[0111] 620: Temperature cutoff element

[0112] 700: Third terminal

Claims

1. A battery cell having a first electrode and a second electrode; A first connector having one end electrically connected to the first electrode and extended; A first terminal connected to the other side of the first connector; A second connector having one end electrically connected to the second electrode and extended; A second terminal connected to the other side of the second connector; A third connector having one end connected to a portion of the first connector and extended; In a battery pack including a third terminal connected to the other side of the third connector, A battery pack having a static power load element in the third connector.

2. In paragraph 1, A battery pack wherein the first electrode is a positive electrode and the second electrode is a negative electrode.

3. In paragraph 1, A battery pack having the above-mentioned static power load element having substantially no resistance during normal operation and having a function of blocking the flow of current when the current flowing through the third connector reaches a preset amount of power.

4. In paragraph 1, A battery pack having the above-mentioned static power load element having substantially no resistance during normal operation and having a function of cutting off current flowing to the third connector when the temperature of the battery cell reaches a preset temperature value.

5. In paragraph 1, The above-mentioned electrostatic load element is a battery pack equipped with a fuse that breaks when the temperature exceeds a certain level.

6. In paragraph 1, A battery pack with a pull tape added for separating the battery pack.

7. A device comprising a battery pack according to any one of claims 1 to 6.

8. A method for separating a battery pack from a device including a battery pack according to any one of claims 1 to 6, A method for separating a battery pack electrically connected between the second terminal and the third terminal.

9. In paragraph 8, A method for separating a battery pack by electrically connecting the second terminal and the third terminal by a separate connecting member.

10. In paragraph 8, A method for separating a battery pack in which the third terminal is configured to be electrically connected only by the separate connecting member.

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