Specification
Title of invention: cable type battery
Technical field
[One]
This application is a priority claim application for Korean Patent Application No. 10-2017-0156287 filed on November 22, 2017, and all contents disclosed in the specification and drawings of the application are incorporated herein by reference.
[2]
The present invention relates to a cable type battery, and more particularly, to a cable type battery capable of protecting a battery cell from overcharging or overdischarging.
Background
[3]
As technology development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing, and nickel cadmium batteries or hydrogen ion batteries have been used as conventional secondary batteries, but recently, memory effects compared to nickel-based secondary batteries Since little occurs, charging and discharging are free, self-discharge rate is very low, and lithium secondary batteries with high energy density are widely used.
[4]
These lithium secondary batteries mainly use lithium-based oxides and carbon materials as a positive electrode active material and a negative electrode active material, respectively. A lithium secondary battery includes a secondary battery cell in which a positive electrode plate and a negative electrode plate to which such a positive electrode active material and a negative electrode active material are applied, respectively, are disposed with a separator therebetween, and an exterior material that seals and accommodates the secondary battery cell with an electrolyte solution, that is, a battery case.
[5]
Lithium secondary batteries consist of a positive electrode, a negative electrode, and a separator and electrolyte interposed therebetween, and depending on which positive electrode active material and negative electrode active material are used, a lithium ion battery (LIB) or a lithium polymer battery (Polymer Lithium Ion Battery) is used. , PLIB), etc. Typically, the electrodes of these lithium secondary batteries are formed by applying a positive or negative active material to a current collector such as an aluminum or copper sheet, a mesh, a film, or a foil, followed by drying.
[6]
Most of the secondary batteries currently used are cylindrical, rectangular or pouch-type secondary batteries. These secondary batteries are classified into pouch type, cylindrical shape, and square shape according to the type of exterior material. Secondary batteries are easy to manufacture and low manufacturing cost because an electrode assembly consisting of a negative electrode, a positive electrode, and a separator is mounted inside a pouch-shaped case of a cylindrical or rectangular metal can or aluminum laminate sheet, and an electrolyte is injected into the electrode assembly. Has an advantage. However, if a certain space for mounting the secondary battery is essentially required, it has a disadvantage in that deformation of the shape is limited. Accordingly, there is a problem in that the secondary battery in the form of a cylindrical, square or pouch acts as a restriction on the development of various types of portable devices.
[7]
Accordingly, there is a need for a new type of secondary battery that is easily deformable. In connection with this demand, a cable-type secondary battery, which is a secondary battery having a very large ratio of length to cross-sectional diameter, has been proposed. The main characteristic of such a secondary battery is that it has a so-called cable structure that is configured in an elongated shape and can be stretched in the longitudinal direction. However, in the case of a conventional secondary battery having a long length, there is a problem in that the battery cell cannot be properly protected from overcharging or overdischarging of the battery cell.
Detailed description of the invention
Technical challenge
[8]
Accordingly, an object of the present invention is to provide a cable-type battery capable of protecting a battery cell from overcharging or overdischarging.
[9]
In addition, it is to provide a cable-type battery capable of insulating, waterproof and dustproof protection circuit modules.
[10]
In addition, it is to provide a cable-type battery capable of protecting the battery cell from external physical shock.
Means of solving the task
[11]
According to an aspect of the present invention, at least one internal electrode layer including an internal electrode active material formed on a surface of an internal current collector extending in a longitudinal direction to have a cross section of a predetermined shape, and a separation layer formed to surround the internal electrode layer And, a cable type battery cell including an external electrode layer surrounding the separation layer and including an external electrode active material formed on a surface of an external current collector; And a protection circuit module electrically connected to the battery cell to protect the battery cell.
[12]
In addition, the battery cell may be formed to be flexible.
[13]
In addition, the protection circuit module includes an end connection protection circuit module, and the end connection protection circuit module may be connected to one end of the battery cell.
[14]
In addition, an insulating member provided to surround the end connection protection circuit module may be further included.
[15]
In addition, the insulating member may include a hot melt.
[16]
In addition, the protection circuit module may include an accommodation protection circuit module, and the accommodation protection circuit module may be provided to accommodate the battery cell.
[17]
In addition, the accommodation protection circuit module may be provided as a flexible substrate and may be provided to surround the battery cell.
[18]
In addition, in the accommodation protection circuit module, a circuit component may be mounted inside the accommodation protection circuit module.
[19]
Meanwhile, according to another aspect of the present invention, a battery pack including the above-described cable type battery may be provided, and a device including the cable type battery may be provided.
Effects of the Invention
[20]
Embodiments of the present invention have an effect of protecting a battery cell from overcharging or overdischarging by a protection circuit module connected to the battery cell.
[21]
In addition, insulation, waterproofing and dustproofing of the protection circuit module are possible by the insulation member coupled to the protection circuit module.
[22]
In addition, the protection circuit module is provided so as to surround the battery cell to protect the battery cell from external physical shock.
Brief description of the drawing
[23]
1 is a schematic perspective view of a cable type battery cell in a cable type battery according to a first embodiment of the present invention.
[24]
FIG. 2 is a cross-sectional view of a battery cell viewed along line AA′ of FIG. 1.
[25]
3 is a schematic perspective view of a combined protection circuit module in the cable-type battery according to the first embodiment of the present invention.
[26]
4 is a schematic perspective view of an insulating member coupled to the protection circuit module in FIG. 3.
[27]
5(a) and 5(b) are schematic perspective views of a protection circuit module accommodating a battery cell in a cable type battery according to a second embodiment of the present invention.
Mode for carrying out the invention
[28]
Hereinafter, with reference to the accompanying drawings will be described in detail according to a preferred embodiment of the present invention. The terms or words used in the specification and claims are not to be construed as limited to their usual or dictionary meanings, and the inventor may appropriately define the concept of terms in order to describe his own invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of ​​the present invention based on the principle that there is. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiment of the present invention and do not represent all the technical spirit of the present invention, and thus various It should be understood that there may be equivalents and variations.
[29]
In the drawings, the size of each component or a specific part constituting the component is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. Therefore, the size of each component does not entirely reflect the actual size. If it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, such description will be omitted.
[30]
The term'coupling' or'connection' as used herein is not only when one member and another member are directly connected or directly connected, but also when one member is indirectly connected to another member through a joint member, or indirectly It also includes cases connected to.
[31]
1 is a schematic perspective view of a cable type battery cell in a cable type battery according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of the battery cell as viewed along line AA′ of FIG. 1, and FIG. 3 is In the cable type battery according to the first embodiment of the present invention, a schematic perspective view of a form in which a protection circuit module is combined, and FIG. 4 is a schematic perspective view of a form in which an insulating member is combined with the protection circuit module in FIG. 3.
[32]
1 to 3, a cable-type battery 10 according to a first embodiment of the present invention includes a cable-type battery cell 100 and a protection circuit module 200. Here, the cable-type battery cell 100 is a battery cell 100 having a large length ratio with respect to the diameter of the cross section, and hereinafter, the battery cell 100 refers to a cable-type battery cell 100 formed long in the length direction. do.
[33]
The battery cell 100 may convert and store electrical energy supplied from the outside into chemical energy, and convert the stored chemical energy into electrical energy and supply it to the outside. The battery cell 100 may be provided with a first wire 140 connected to a positive terminal or a negative terminal, and a second wire 150 coupled to the battery cell 100 and connected to a negative terminal or a positive terminal Can be provided.
[34]
The battery cell 100, referring to FIG. 2, includes an internal electrode layer 110, a separation layer 120, and an external electrode layer 130.
[35]
The internal electrode layer 110 includes an internal current collector 111 and an internal electrode active material 112, and has an internal electrode active material 112 on the surface of the internal current collector 111 extending in the longitudinal direction with a horizontal cross section of a predetermined shape. It can be provided to form. Here, the predetermined shape means that the shape is not particularly limited, and any shape that does not impair the essence of the present invention is possible. The horizontal cross section of the internal current collector 111 may be circular or polygonal, and the circular structure includes a geometrically completely symmetrical circular and asymmetrical elliptical structure. The polygonal structure is not particularly limited, and such a polygonal structure may be, for example, a triangle, a square, a pentagon or a hexagon. However, in the manufacturing process, a pipe-type current collector, a wound wire-type current collector, a wound sheet-type, or a mesh-type current collector may be used. In addition, the internal electrode layer 110 may be a cathode or an anode.
[36]
The separation layer 120 is formed to surround the inner electrode layer 110 on the outer surface of the inner electrode layer 110. The separation layer 120 includes an electrolyte serving as a passage for ions. In addition, an external electrode layer 130 is formed on the outer surface of the separation layer 120 so as to surround the separation layer 120.
[37]
The external electrode layer 130 may include an external current collector 131 and an external electrode active material 132, and may be provided so that the external electrode active material 132 is formed on the surface of the external current collector 131. The external current collector 131 may also use a pipe type current collector, a wound wire type current collector, a wound sheet type, or a mesh type current collector during the manufacturing process. In addition, the outer electrode layer 130 may be an anode or a cathode so as to correspond to the inner electrode layer 110. That is, when the inner electrode layer 110 is an anode, the outer electrode layer 130 is a cathode, and when the inner electrode layer 110 is a cathode, the outer electrode layer 130 is an anode.
[38]
The internal current collector 111 and the external current collector 131 collect electrons generated by an electrochemical reaction of the internal electrode active material 112 and the external electrode active material 132 or supply electrons required for the electrochemical reaction. To do so, metals such as copper or aluminum can be used. In addition, the battery cell 100 may be formed to be flexible so as to be freely deformed, and for this purpose, a conductive polymer such as polypyrrole may be used as a current collector. However, the material of the current collector is not limited by metal or polypyrrole.
[39]
Meanwhile, the battery cell 100 may be provided with a protective sheath 160. The protective coating 160 may be a conventional polymer resin as an insulator, for example, PVC, HDPE or epoxy resin may be used.
[40]
The protection circuit module 200 is electrically connected to the battery cell 100 in various ways to protect the battery cell 100. For example, the protection circuit module 200 is electrically connected to the battery cell 100 to prevent at least one of overcharging and overdischarging of the battery cell 100 and performing various protection operations, such as blocking the inflow of overcurrent. Also, the voltage of the battery cell 100 may be measured. Here, the protection circuit module 200 measures the voltage of the battery cell 100 and blocks the charging current or the discharging current when an abnormal voltage occurs during charging or discharging.
[41]
The protection circuit module 200 may be provided with an end connection protection circuit module 210. Referring to FIG. 3, the end connection protection circuit module 210 is connected to one end of the battery cell 100. That is, it is electrically connected to the first wire 140 and the second wire 150 formed at one end of the battery cell 100. Here, when the connection portions of the wires 140 and 150 of the battery cell 100 and the end connection protection circuit module 210 are exposed to the outside, an electrical short may occur. Accordingly, as shown in FIG. 4, the insulating member 300 may be provided to surround the end connection protection circuit module 210 for insulation of the end connection protection circuit module 210. That is, if an adhesive such as hot melt is used instead of the case, the end connection protection circuit module 210 can be insulated while reducing the volume and weight, and thus the wires 140 and 150 and the end connection protection circuit module 210 ) It can prevent electrical short at the connection part. However, if the end connection protection circuit module 210 can be insulated without the insulation member 300, the insulation member 300 may be omitted. In addition, a waterproof or dustproof effect is recognized as well as a short-circuit prevention effect at a connection portion between the wires 140 and 150 and the end connection protection circuit module 210 by the insulating member 300. However, the insulating member 300 is not necessarily limited to hot melt, and if insulation at the connection portion between the wires 140 and 150 and the end connection protection circuit module 210 is possible, various materials such as various composite resins Etc. can be used. Meanwhile,
[42]
Hereinafter, operations and effects of the cable type battery 10 according to the first embodiment of the present invention will be described with reference to the drawings.
[43]
In order to use the battery for various purposes, a cable-type battery 10 having a long length may be provided. The cable type battery 10 includes a cable type battery cell 100 and a protection circuit module 200 coupled to the battery cell 100 to prevent overcharging and overdischarging of the battery cell 100. Here, the battery cell 100 is formed to be flexible and bent in various directions, and an end connection protection circuit module 210 may be coupled to one end thereof. In addition, the end connection protection circuit module 210 may be coupled to an insulating member 300 such as a hot melt that can replace the case, whereby the wires 140 and 150 and the end connection protection circuit module 210 There is an effect that insulation at the connection part becomes possible.
[44]
5(a) and 5(b) are schematic perspective views of a protection circuit module accommodating a battery cell in a cable type battery according to a second embodiment of the present invention.
[45]
Hereinafter, the operation and effect of the cable type battery 10 according to the second embodiment of the present invention will be described with reference to the drawings, but the contents are common to the contents described in the cable type battery 10 according to the first embodiment of the present invention. The parts to be replaced by the above description.
[46]
The second embodiment of the present invention differs from the first embodiment in which the end connection protection circuit module 210 is provided in that the receiving protection circuit module 220 is provided.
[47]
The protection circuit module 200 is provided as an accommodation protection circuit module 220, and referring to FIGS. 5(a) and 5(b), the accommodation protection circuit module 220 is provided to accommodate the battery cell 100 do. Here, FIG. 5(a) is a case where the wires 221 and 222 connected to the positive and negative electrodes of the battery cell 100 are formed at one end of the receiving protection circuit module 220, and FIG. 5(b) is a battery In this case, the wires 221 and 222 connected to the anode and the cathode of the cell 100 are formed at both ends of the receiving protection circuit module 220, respectively.
[48]
The accommodation protection circuit module 220 may be provided with a flexible substrate such as a FPCB (FLEXIBLE PRINTED CIRCUIT BOARD) to surround the battery cell 100. That is, the receiving protection circuit module 220 may be manufactured by rolling a round so as to surround the battery cell 100 in a state in which the flexible substrate is unfolded, and bonding the ends thereof by bonding, hot melt, or the like. When the flexible substrate surrounds the battery cell 100 as described above, when the battery cell 100 is bent, it is interlocked with it and bends together, so that the advantage of the battery cell 100 can be sufficiently utilized.
[49]
In addition, since the flexible substrate surrounds the battery cell 100, the flexible substrate not only protects the battery cell 100 from external physical shocks, but also has an insulating effect.
[50]
On the other hand, there are various types of circuit components mounted on the receiving protection circuit module 220 including a flexible substrate. If such circuit components are exposed to the outside, the battery cell 100 can be protected from a physical shock. , Circuit components mounted on the receiving protection circuit module 220 may be damaged. In order to prevent damage to such circuit components, the circuit components may be mounted inside the receiving protection circuit module 220. That is, in the form where the flexible substrate of the receiving protection circuit module 220 surrounds the battery cell 100, the circuit component is located inside the receiving protection circuit module 220 in which the battery cell 100 is disposed, thereby causing an external impact. It can prevent breakage of circuit parts from the back.
[51]
However, it does not exclude that the circuit component is mounted outside, and if the circuit component is mounted outside the housing protection circuit module 220, the housing protection circuit module 220 may be sealed or insulated with an insulating sheet. .
[52]
Further, the positive terminal and the negative terminal of the battery cell 100 may be coupled to the receiving protection circuit module 220 by various welding, for example, spot welding, soldering, laser welding, or the like.
[53]
Meanwhile, a battery pack (not shown) according to an embodiment of the present invention may include at least one cable type battery 10 according to an embodiment of the present invention as described above. In addition, the battery pack (not shown) may further include a case for accommodating the cable type battery 10 in addition to the cable type battery 10.
[54]
Meanwhile, a device (not shown) according to an embodiment of the present invention may include the above-described cable type battery 10 or a battery pack (not shown), and the battery pack (not shown) includes the cable type battery ( 10) may be included. In addition, the device (not shown) may include a variety of machines, devices, appliances, devices, etc., for example, an emergency power supply, a computer room power supply, a portable power supply, a medical equipment power supply, a fire extinguishing equipment power supply, an alarm It may include a facility power supply or an evacuation facility power supply. Here, the aforementioned cable type battery 10 or a battery pack (not shown) may be used as a power source for the device (not shown). In particular, a device (not shown) according to an embodiment of the present invention may be a commercially available wearable device, and may include various devices that can be adapted to the flexion of the body, such as a neckband type, a wristband type, and a ring type. , May include a variety of earphones. That is, the above-described cable type battery 10 or battery pack (not shown) may be used as a power source for wearable devices such as neckband type, wristband type, ring type, and various earphones.
[55]
In the above, although the present invention has been described by limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of ​​the present invention and the following will be described by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various modifications and variations are possible within the equal scope of the claims.
Industrial availability
[56]
The present invention relates to a cable type battery, and particularly, can be used in industries related to secondary batteries.
Claims
[Claim 1]
At least one internal electrode layer including an internal electrode active material formed on the surface of the internal current collector extending in the longitudinal direction so as to have a cross section of a predetermined shape, a separation layer formed to surround the internal electrode layer, and surrounding the separation layer A cable type battery cell including an external electrode layer including an external electrode active material formed on the surface of the external current collector; And a protection circuit module electrically connected to the battery cell to protect the battery cell.
[Claim 2]
The cable-type battery of claim 1, wherein the battery cell is formed to be flexible.
[Claim 3]
The cable type battery according to claim 1, wherein the protection circuit module comprises an end connection protection circuit module, and the end connection protection circuit module is connected to one end of the battery cell.
[Claim 4]
The cable-type battery according to claim 3, further comprising an insulating member provided to surround the end connection protection circuit module.
[Claim 5]
The cable type battery according to claim 4, wherein the insulating member comprises a hot melt.
[Claim 6]
The cable type battery according to claim 1, wherein the protection circuit module comprises an accommodation protection circuit module, and the accommodation protection circuit module is provided to accommodate the battery cell.
[Claim 7]
The cable type battery according to claim 6, wherein the receiving protection circuit module is provided as a flexible substrate and is provided to surround the battery cell.
[Claim 8]
7. The cable type battery according to claim 6, wherein in the accommodation protection circuit module, circuit components are mounted inside the accommodation protection circuit module.
[Claim 9]
A battery pack comprising a cable type battery according to any one of claims 1 to 8.
[Claim 10]
A device comprising a cable type battery according to any one of claims 1 to 8.