Easy-to-remove battery pack

Abstract

The present invention relates to an easily detachable battery pack, and more particularly to a battery pack including: a battery cell having a first electrode and a second electrode; a first connector extending and electrically connected to the first electrode at one side; a first terminal connected to the other side of the first connector; a second connector extending and electrically connected to the second electrode at one side; a second terminal connected to the other side of the second connector; a third connector extending and connected to a portion of the first connector at one side; and a third terminal connected to the other side of the third connector, wherein the third connector has an electrostatic force load element.

Description

[Technical Field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0174917, filed December 5, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to an easily detachable battery pack, and more particularly, to a battery pack that can be easily detached by inducing heat generation due to a short circuit to forcibly expand the battery pack when replacing the battery pack attached to a device. [Background technology]

[0003] Conventional mobile phones have a battery that can be replaced by the user. The battery is essentially a separate battery pack made of a pouch-type battery or a prismatic battery with an external plastic case. The user can easily replace the battery after disassembling the mobile phone.

[0004] Small electronic devices, such as smartphones, that use pouch-type batteries are manufactured with the pouch-type batteries built in. To ensure waterproofing and dustproofing, the cases of the small electronic devices are welded using ultrasonic waves or lasers, making it difficult to disassemble. The built-in battery pack or pouch-type battery is an internal component and may be connected to a PCB. For internal fixation, adhesive or string-type adhesive tape is applied to one side of the pouch-type battery, making it difficult to separate the pouch-type battery from the electronic device. Separating the pouch-type battery from the electronic device can result in physical damage to the pouch-type battery, potentially causing a fire.

[0005] Recently, electronic devices, including smartphones, have been designed to make it extremely difficult for users to directly replace batteries. When a battery reaches the end of its life, users typically either replace the battery by repairing the entire device, or even replace the device itself.

[0006] Although electronic devices can be used for a long time by replacing only the battery itself, repairing or replacing the entire device is undesirable from the perspective of recycling and the environment. Recently, in Europe and other countries, related regulations have been strengthened to address this issue, allowing users to easily replace built-in pouch-type batteries.

[0007] Batteries built into smartphones and other devices are often in the form of a battery pack, which essentially consists of a pouch-type battery equipped with a protection circuit and wrapped in a film or other material. In the case of very simple, small devices, the pouch-type battery may be directly connected to the electronic device without a protection circuit. Although not in the form of a battery pack, a simple protection circuit may be attached to the pouch-type battery. The battery pack referred to in this invention is characterized by its easy attachment and detachment, which requires the construction of a basic circuit. In this invention, not only a regular battery pack but also a single pouch-type battery with a simple circuit attached is referred to as a battery pack.

[0008] FIG. 1 is a perspective view showing a conventional battery pack and a separation tape attached thereto. A separate separation tape is provided on a battery pack to allow users to easily replace the battery pack. If the protruding portion of the battery pack is the top surface (xz surface), the separation tape is attached to the front, both sides, and rear of the battery pack, surrounding the entire surface. A tab is provided on one side of the separation tape to allow users to easily remove the separation tape. Because it is intended for separation, the adhesive strength of the separation tape is not high, and the adhesive strengths of the front, both sides, and rear may vary. An adhesive or tape for securing the battery pack to an electronic device is attached to the separation tape. That is, when the tab is used to remove the separation tape from the battery pack, the adhesive or tape securing the battery pack to the electronic device is also separated. This allows the battery pack to be easily separated from the electronic device.

[0009] The separation tape must be attached separately to the battery pack, and while some processes such as rear bonding can be automated when using a conveyor belt, attachment to the sides and front is currently performed manually due to the lack of alternative methods.

[0010] Furthermore, even if the separation tape is attached, the adhesive strength between the separation tape and the battery pack must be different from the adhesive strength between the separation tape and the fixing adhesive. Such uneven adhesive strength may change over time or due to heat emitted from the electronic device, so the battery pack may not be separated and removed as intended.

[0011] Patent document 1 discloses a seating portion on which the battery sits, a first tape attachment device that attaches tape to both sides of the battery, a second tape attachment device that attaches tape to the top surface of the battery, a transport rail that horizontally moves the attachment members of the first and second tape attachment devices, and a workbench on which the first and second tape attachment devices are mounted.

[0012] In Patent Document 1, tape is attached to both sides of the battery, but when tension is applied to remove or install the battery, the tape may be damaged, making it difficult to remove or install the battery.

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

[0014] Patent Document 3 discloses a battery pack equipped with a load device that discharges electrostatic force, but is different from the electrostatic force load element of the present invention that causes a short circuit. [Prior art documents] [Patent documents]

[0015] [Patent Document 1] Korean Patent No. 10-2016756

[0016] [Patent Document 2] Korean Patent No. 10-1419113

[0017] [Patent Document 3] JP 2015-81773 A Summary of the Invention [Problem to be solved by the invention]

[0018] SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a battery pack that can be easily detached from an electronic device when the battery pack needs to be replaced due to a deterioration in performance and capacity.

[0019] Specifically, an object of the present invention is to provide a battery pack that is easy to attach and detach without the need for a separate detachment tape. [Means for solving the problem]

[0020] In order to achieve the above object, the 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 side electrically connected to and extending from the first electrode (110), a first terminal (300) connected to the other side of the first connector (200), a second connector (400) having one side electrically connected to and extending from the second electrode (120), a second terminal (500) connected to the other side of the second connector (400), a third connector (600) having one side connected to a portion of the first connector (200) and extending from the third connector (600), and a third terminal (700) connected to the other side of the third connector (600), wherein the third connector (600) includes an electrostatic force load element (610).

[0021] The first electrode (110) may be a positive electrode and the second electrode (120) may be a negative electrode.

[0022] The electrostatic force load element (610) has substantially no resistance during normal operation and can have the function of cutting off the flow of current when the current flowing through the third connector (600) reaches a preset amount of power.

[0023] The electrostatic force load element (610) has substantially no resistance during normal operation and may have the function of cutting off the current flowing through the third connector (600) when the temperature of the battery cell (100) reaches a preset temperature value.

[0024] The electrostatic force load element (610) may include a fuse that breaks above a certain temperature.

[0025] A pull tape may be provided for separation of the battery pack.

[0026] The present invention provides a device including the battery pack described above.

[0027] The present invention provides a method for separating a battery pack from a device including the aforementioned battery pack, the method comprising: electrically connecting the second terminal (500) and the third terminal (700) of the battery pack;

[0028] The second terminal (500) and the third terminal (700) can be electrically connected to each other by a separate connecting member.

[0029] The third terminal (700) may be configured so as to be electrically connectable only by the separate connecting member.

[0030] Furthermore, the present invention can also be provided in the form of various combinations of means for solving the above problems. [Effects of the Invention]

[0031] As described above, the present invention induces heat generation due to a short circuit that electrically connects the second terminal and the third terminal, causing the battery cells inside the battery pack to expand, and ultimately the battery pack expands, allowing it to be easily separated from the electronic device.

[0032] Furthermore, the present invention has the advantage that the cost of replacing battery packs can be reduced by using a connecting member that can be used multiple times without the need for separation tape used in the prior art. [Brief explanation of the drawings]

[0033] [Figure 1] 1 is a perspective view showing a battery pack according to the prior art and a separation tape attached thereto;

[0034] [Figure 2] 1 is a schematic diagram showing a battery pack according to a first embodiment of the present invention.

[0035] [Figure 3] FIG. 4 is a schematic diagram showing a battery pack according to a second embodiment of the present invention.

[0036] [Figure 4] 1 is a flowchart illustrating a method for separating a battery pack from a device that includes the battery pack, according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0037] Hereinafter, with reference to the accompanying drawings, a detailed description will be given of an embodiment of the present invention that will enable a person skilled in the art to easily carry out the present invention. However, in describing the operation principle of the preferred embodiment of the present invention in detail, if it is determined that a detailed description of related well-known functions or configurations may unnecessarily obscure the gist of the present invention, such detailed description will be omitted.

[0038] Furthermore, the same reference numerals are used throughout the drawings for parts having similar functions and actions. Throughout the specification, when a part is said to be connected to another part, this includes not only a direct connection but also an indirect connection via another element therebetween. Furthermore, unless otherwise specified, "including a certain element" does not mean that other elements are excluded, but that other elements may also be included.

[0039] Hereinafter, an easily detachable battery pack according to the present invention will be described with reference to the accompanying drawings.

[0040] FIG. 2 is a schematic diagram showing a battery pack according to a first embodiment of the present invention.

[0041] Referring to FIG. 2, the battery pack according to the first embodiment of the present invention includes 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.

[0042] The battery cell 100 is a pouch-type battery cell, and includes a cell case that houses an electrode assembly (not shown), and a pair of electrode leads that are respectively connected to the positive and negative electrode tabs of the electrode assembly.

[0043] The cell casing can be formed using a laminate sheet including an inner resin layer, a metal layer, and an outer resin layer.

[0044] Since the inner resin layer is in direct contact with the electrode assembly, it must have insulating properties and electrolysis resistance. In addition, to seal against the outside, the sealing portion where the inner layers are thermally bonded must have excellent thermal adhesive strength.

[0045] The material for such an inner resin layer may be selected from polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, polybutylene, and acid-modified polypropylene, which have excellent chemical resistance and sealing properties, polyurethane resins, and polyimide resins, but is not limited thereto. Polypropylene, which has excellent mechanical properties such as tensile strength, rigidity, surface hardness, and impact strength, and excellent chemical resistance, is most preferred.

[0046] The metal layer in contact with the internal resin layer corresponds to a barrier layer that prevents moisture and various gases from penetrating into the interior of the battery from the outside, and a preferred material for such a metal layer is an aluminum thin film, which is lightweight yet has excellent formability.

[0047] An outer resin layer is provided on the other side of the metal layer. The outer resin layer may be made of a heat-resistant polymer having excellent tensile strength, moisture barrier properties, and air barrier properties to protect the electrode assembly and ensure heat resistance and chemical resistance. Examples of the outer resin layer include, but are not limited to, nylon or polyethylene terephthalate.

[0048] The electrode assembly may be, but is not limited to, a jelly-roll type electrode assembly having a structure in which a separator is interposed between a long sheet-shaped negative electrode and a positive electrode and the electrode is wound up; a stack type electrode assembly having a structure in which rectangular positive and negative electrodes are stacked with a separator sandwiched between them; a stack-folding type electrode assembly in which unit cells are wound up with a long separator film; or a lamination-stack type electrode assembly in which unit cells are stacked with a separator sandwiched between them and attached to each other.

[0049] The negative electrode is manufactured by coating a negative electrode current collector with a slurry containing a negative electrode active material and a binder.

[0050] The negative electrode current collector is generally manufactured to have a thickness of 3 to 500 μm. Such a negative electrode current collector is not particularly limited as long as it has conductivity without causing chemical changes in the battery. For example, copper, stainless steel, aluminum, nickel, titanium, fired carbon, a surface of copper stainless steel surface-treated with carbon, nickel, titanium, silver, etc., an aluminum cadmium alloy, etc. can be used.

[0051] As the negative electrode active material, for example, carbon such as graphitizable carbon and graphite-based carbon; Li ,

[0054] ,

[0053] , , , , 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, Group 1, Group 2, Group 3 elements of the periodic table, halogen; 0 < x ≦ 1; 1 ≦ y ≦ 3; 1 ≦ z ≦ 8) and other metal composite oxides; lithium metal; lithium alloy; silicon-based alloy; tin-based alloy; metal oxides such as SnO, SnO2, PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4, Bi2O5; conductive polymers such as polyacetylene; Li-Co-Ni-based materials; Si-based materials such as Si, SiO, SiO2 alone or mixtures thereof can be used, but are not limited thereto.

[0052] 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.

[0053] The positive electrode is manufactured by applying a slurry in which a positive electrode active material and a binder are mixed to a positive electrode current collector.

[0054] The positive electrode current collector may generally have a thickness of 3 to 500 μm. It is not particularly limited as long as it has high conductivity without causing chemical changes in the battery. For example, stainless steel, nickel, titanium, calcined carbon, or aluminum or stainless steel surface-treated with carbon, nickel, titanium, silver, etc. may be used. Furthermore, to enhance the adhesive strength of the positive electrode active material, the surface may be finely textured, or various forms such as a film, sheet, foil, net, porous material, foam, or nonwoven fabric may be used.

[0055] Positive electrode active materials include layered compounds such as lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), or compounds substituted with higher transition metals; 1+x Mn 2-x Lithium manganese oxides such as LiMnO4 (where x is 0 to 0.33), LiMnO3, LiMn2O3, and LiMnO2; lithium copper oxide (Li2CuO2); vanadium oxides such as LiV3O8, V2O5, and Cu2V2O7; and the chemical formula LiNi 1-x Ni-site type lithium nickel oxide represented by MxO2 (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 Examples of materials that can be used include, but are not limited to, lithium manganese composite oxides expressed as Li2Mn3MO8 (where M=Co, Ni, Fe, Cr, Zn, or Ta, and x=0.01 to 0.1) or Li2Mn3MO8 (where M=Fe, Co, Ni, Cu, or Zn); LiMn2O4 in which part of the Li in the chemical formula is substituted with an alkaline earth metal ion; and disulfide compounds.

[0056] The positive electrode active material may be mixed with a conductive material and a binder, and a filler may also be added as needed.

[0057] The separator 300 prevents short circuits between the positive and negative electrodes and allows only the movement of lithium ions. The separator may be made of any one of polyethylene, polypropylene, a polyethylene / polypropylene double layer, a polyethylene / polypropylene / polyethylene triple layer, a polypropylene / polyethylene / polypropylene triple layer, and organic fiber filter paper, but is not limited thereto.

[0058] The negative and positive electrode current collectors are composed of a portion coated with a slurry containing an active material and a non-coated portion where the slurry is not applied. The non-coated portion is formed by cutting the non-coated portion or by connecting a separate conductive member to the non-coated portion by ultrasonic welding or the like to form an electrode tab, and the electrode tabs are then gathered to form a tab bundle.

[0059] The electrode leads, which are composed of a positive electrode lead and a negative electrode lead, are generally connected to the tab bundles, more specifically, the positive electrode tab bundle and the negative electrode tab bundle, by a method such as welding, and then protrude outside the cell case.

[0060] Although the present invention has been described with reference to a pouch-type battery cell as an example, other types of battery cells may be substituted and the present invention is not limited to a pouch-type battery cell.

[0061] The battery cell 100 has a first electrode 110 on one side and a second electrode 120 on the other side, where the first electrode 110 may be a positive electrode and the second electrode 120 may be a negative electrode.

[0062] For example, although FIG. 2 shows a structure in which the first electrode 110 and the second electrode 120 of the battery cell 100 are provided on both sides, if necessary, the first electrode 110 and the second electrode 120 may be formed in one direction, spaced apart by a certain distance.

[0063] The first connector 200 is connected to the first electrode 110 on one side and to the first terminal 300 on the other side, thereby electrically connecting the first electrode 110 and the first terminal 300. For example, the first connector 200 may be a wire or a copper wire, but is not particularly limited as long as it can electrically connect the first electrode 110 and the first terminal 300.

[0064] The first terminal 300 is connected to the first electrode 110 of the battery cell 100 accommodated in the battery pack via the first connector 200, and serves to connect the battery cell 100, which is electrically connected to an external device, to the device.

[0065] The second connector 400 is connected to the second electrode 120 on one side and to the second terminal 500 on the other side, thereby electrically connecting the second electrode 120 and the second terminal 500. As with the first connector 200 described above, the second connector 400 may be, for example, a wire wiring or a copper wire, but is not particularly limited as long as it can electrically connect the second electrode 120 and the second terminal 500.

[0066] The second terminal 500 is connected to the second electrode 120 of the battery cell 100 accommodated in the battery pack via the second connector 400, and is electrically connected to an external device, thereby connecting the battery cell 100 to the device.

[0067] Here, the first terminal 300 and the second terminal 500 are connected to devices and serve as terminals for supplying power to the devices when they are operating normally.

[0068] The third connector 600 has one side connected to a part of the first connector 200 and extending therefrom, and the other side connected to the third terminal 700, through which no current flows when the battery pack is operating normally.

[0069] The third connector 600 includes an electrostatic force load element 610 between a portion connected to the first connector 200 and a portion connected to the third terminal 700 .

[0070] The electrostatic load element 610 has a function of blocking the flow of current when the third terminal 700 is connected to another terminal and current flows through the third connector 600, and has substantially no resistance in normal operation, and when the amount of current flowing through the third connector 600 reaches a preset amount of power.

[0071] This function cuts off the current by disconnecting the connecting wire portion through which the current flows inside the electrostatic load element 610, and has the advantage of preventing damage such as a fire in the battery cell 100 due to the induction of an excessive short circuit by cutting off the current when a preset amount of power is reached.

[0072] Here, the above-mentioned preset power amount is an amount of power that can expand the battery cell 100 in a state where it is easy to detach it, but is lower than the amount of power that can cause a fire, and the preset power amount can be set to vary depending on the capacity of the battery cell 100, etc.

[0073] The third terminal 700 has one side connected to the third connector 600 and is not normally connected to any other terminals, but is electrically connected to the second terminal 500 when necessary. When electrically connected to the second terminal 500, it causes a short circuit of the battery cell 100.

[0074] Here, if there is no separate connecting member, the third terminal 700 is normally not electrically connected to other terminals, and therefore, the third connector 600 may not be able to pass current.

[0075] This is because the third terminal 700 is electrically connected and short-circuited only when repairing the battery pack due to an abnormality, replacing the battery pack, or removing the battery pack due to disposal of the device.

[0076] It is also preferable that the third terminal 700 is not exposed to the outside, because if it is exposed to the outside, it may come into contact with other members, causing an unintended short circuit.

[0077] The battery pack according to the present invention has pull tapes for separating the battery pack, which are provided around the front, both sides, and rear, and has the advantage that if the battery cell 100 expands due to a short circuit, it can be easily removed and attached by pulling the tabs provided on the pull tapes.

[0078] FIG. 3 is a schematic diagram showing a battery pack according to a second embodiment of the present invention.

[0079] Referring to Figure 3, the battery pack according to the second embodiment is similar to the battery pack according to the first embodiment described in Figure 2, except that the third connector 600 is provided with a temperature blocking element 620, and therefore a description of the same configuration will be omitted.

[0080] The battery pack according to the second embodiment of the present invention includes 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.

[0081] The third connector 600 according to the second embodiment includes a temperature cutoff element 620 .

[0082] When the second terminal 500 and the third terminal 700 are connected, the temperature cut-off element 620 has substantially no resistance in normal operation, and has the function of cutting off the current flowing through the third connector 600 when the temperature of the battery cell 100 reaches a preset temperature value.

[0083] The preset temperature value can be set lower than the temperature at which a short circuit causes the battery cell 100 to expand and start a fire, making it possible to easily attach and detach the battery cell 100 while preventing damage such as a fire caused by a short circuit.

[0084] Here, the temperature cutoff device 620 may further include a temperature sensor (not shown) capable of measuring the temperature of the battery cell 100 in order to cut off the flow of current based on the temperature of the battery cell 100 .

[0085] The temperature cutoff element 620 has a structure equipped with a fuse to eliminate the need for a temperature sensor, and the fuse may be made of different thicknesses and materials depending on the degree of expansion to facilitate the attachment and detachment of the battery cell 100, thereby cutting off the current before a fire or the like occurs in the battery cell 100.

[0086] FIG. 4 is a flowchart illustrating a method for separating a battery pack from a device that includes the battery pack according to an embodiment of the present invention.

[0087] Referring to FIG. 4, a method for separating a battery pack from a device including a battery pack according to the present invention includes a first step of determining whether the battery pack can be replaced, a second step of electrically connecting the second terminal and the third terminal, and a third step of separating the battery pack while the second terminal and the third terminal are connected.

[0088] The first step in determining whether a battery pack needs to be replaced is to check the battery pack's capacity reduction, performance degradation, and lithium deposition and other defects based on the period of use and the number of charge / discharge cycles, and determine whether the battery pack needs to be replaced.

[0089] 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 via a connecting member that is prepared separately from the battery pack.

[0090] The connecting member is made of a conductive material, 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.

[0091] The third terminal is normally not connected to the second terminal and is configured to be electrically connected only by the connecting member, and the minimum length of the connecting member can be set to be equal to or greater than the distance between the second terminal and the third terminal.

[0092] The connecting member may be configured as a rod-shaped member whose length is adjustable, connected to one side of either the second terminal or the third terminal, and movable within a certain radius based on the one side, so that the other side can be connected to another terminal that is not connected to the one side.

[0093] Also, the connecting member may be configured in a switch shape that can adjust the electrical connection state between the second terminal and the third terminal.

[0094] That is, when the battery pack needs to be detached, the second terminal and the third terminal are electrically connected by the connecting member, and the electrical connection between the second terminal and the third terminal causes a short circuit in the battery cell, resulting in volume expansion, making it easier to detach the battery pack.

[0095] Here, since the third connector is equipped with an electrostatic load element or a temperature cutoff element, it is possible to prevent unnecessary short circuits from occurring in the battery cells, which could lead to a fire.

[0096] The third stage, in which the battery pack is separated with the second terminal and the third terminal connected, is a stage in which the battery cells are separated in a state in which a short circuit occurs in the battery cells and their volume expands due to the second terminal and the third terminal being connected by the connecting member in the second stage.

[0097] The battery cell whose volume has expanded due to the occurrence of a short circuit can be separated by using the pull tape that additionally wraps around the battery cell.

[0098] The present invention may be a device including the battery pack described above, and examples thereof may include a smartphone and an electric scooter.

[0099] Those skilled in the art will appreciate that various applications and modifications within the scope of the present invention will be possible based on the above content. [Explanation of symbols]

[0100] 100 battery cells

[0101] 110 1st electrode

[0102] 120 2nd electrode

[0103] 200 1st Connector

[0104] 300 1st terminal

[0105] 400 2nd Connector

[0106] 500 2nd terminal

[0107] 600 3rd Connector

[0108] 610 Electrostatic force load element

[0109] 620 Temperature cutoff element

[0110] 700 3rd terminal

Claims

1. a battery cell including a first electrode and a second electrode; a first connector extending from the first electrode and electrically connected to the first electrode; a first terminal connected to the other side of the first connector; a second connector extending from the second electrode and electrically connected to the second electrode; a second terminal connected to the other side of the second connector; a third connector, one side of which is connected to a portion of the first connector and extends therefrom; a third terminal connected to the other side of the third connector, The third connector includes an electrostatic force load element.

2. The battery pack according to claim 1 , wherein the first electrode is a positive electrode and the second electrode is a negative electrode.

3. 2. The battery pack of claim 1, wherein the electrostatic force load element has substantially no resistance in normal operation and has a function of cutting off the flow of current when the current flowing through the third connector reaches a preset power amount.

4. 2. The battery pack according to claim 1, wherein the electrostatic force load element has substantially no resistance in normal operation and has a function of cutting off current flowing through the third connector when the temperature of the battery cell reaches a preset temperature value.

5. 2. The battery pack according to claim 1, wherein the electrostatic force load element comprises a fuse that breaks at a temperature above a certain level.

6. 10. The battery pack of claim 1, comprising a pull tape for separation of the battery pack.

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

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

9. 9. The method for separating a battery pack according to claim 8, wherein the second terminal and the third terminal are electrically connected by a separate connecting member.

10. 10. The method for separating battery packs according to claim 9, wherein the third terminal is configured so as to be electrically connectable only by the separate connecting member.

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