Composite panel for battery pack and battery pack including the same

Abstract

A composite panel for a battery pack and a battery pack including the same are provided. According to one embodiment of the present invention, the composite panel for a battery pack is disposed on at least one side of a battery cell. The composite panel includes: a heat sink portion; a heating portion including a heating circuit pattern formed in a predetermined area; and a sensor portion for sensing one or more of the external temperature and expansion of the battery cell. Accordingly, the composite panel for a battery pack and the battery pack including the same can sense the temperature and expansion of the battery cell due to the sensor portion. Due to the heat sink portion, the composite panel has excellent heat dissipation characteristics. Furthermore, due to the heating portion being able to generate a predetermined amount of heat, the temperature of the battery cell can be easily regulated.

Description

Technical Field

[0001] The present invention relates to a composite panel for a battery pack, and more particularly, to a composite panel for a battery pack and a battery pack comprising the composite panel. Background Art

[0002] In recent years, with the rapid development of industries such as electronics and communications, high-output lithium-ion batteries have been widely used. They are not only used in portable electronic devices such as mobile phones and laptops, but their use has also expanded to medium and large devices that require high output and high power, such as power tools, electric bicycles, and automobiles.

[0003] For this reason, in order to apply lithium-ion batteries to medium-sized and large-sized devices, a large-capacity battery module is realized by connecting a plurality of battery cells in series or in parallel.

[0004] On the other hand, when the temperature of the lithium-ion battery increases, the overall performance of the battery may decline, such as a decrease in charge capacity or a reaction between the negative electrode and the electrolyte, and when the temperature decreases, the overall performance of the battery may also decline, such as a shortened battery life or a reduced charging speed, so it is preferable to maintain a uniform temperature.

[0005] Furthermore, lithium-ion batteries swell when charged and the swelling disappears when discharged. However, repeated charging and discharging cannot completely eliminate the swelling, causing the battery to bulge and swell. Severe swelling will result in the battery being considered defective.

[0006] Therefore, there is an urgent need to develop a battery management system that can sense the temperature and expansion of the battery, thereby having excellent heat dissipation characteristics, and because it can generate a predetermined amount of heat, it can also show the effect of very easy temperature regulation. Summary of the Invention

[0007] Technical issues

[0008] The present invention is proposed in view of the above-mentioned problems, and an object thereof is to provide a composite panel for a battery pack that can sense the temperature and expansion of a battery cell.

[0009] Furthermore, another object of the present invention is to provide a composite panel for a battery pack and a battery pack including the same, which has excellent heat dissipation characteristics and can easily regulate the temperature of battery cells because it can generate a predetermined amount of heat.

[0010] Means of solving the problem

[0011] In order to solve the above problems, the present invention provides a composite panel for a battery pack, which is arranged on at least one side of a battery cell. The composite panel includes: a heat sink portion; a heating plate portion, including a heating circuit pattern formed in a predetermined area; and a sensor portion for sensing one or more of the external temperature and expansion of the battery cell.

[0012] According to an embodiment of the present invention, the heat sink portion may include a first heat sink portion and a second heat sink portion, and the heating fin portion and the sensor portion may be included between the first heat sink portion and the second heat sink portion.

[0013] Furthermore, the heating sheet portion may include a heating circuit pattern formed on one or both surfaces in a manner such that at least one of the first heat dissipation sheet portion and the second heat dissipation sheet portion is in contact with each other.

[0014] Furthermore, the sensor unit may include one or more of a pressure sensor and a temperature sensor.

[0015] Furthermore, the sensor portion may be provided adjacent to the heating sheet portion.

[0016] Furthermore, the heating sheet portion may include a receiving portion for receiving a portion or all of the sensor portion, and a portion or all of the sensor portion may be received in the receiving portion.

[0017] Furthermore, the heat sink portion may include at least one selected from the group consisting of heat dissipating plastic, carbon sheet, metal sheet, and ceramic sheet.

[0018] Furthermore, the carbon sheet may include a graphite sheet.

[0019] Furthermore, the heat dissipation plastic may include polymer resin and heat dissipation filler.

[0020] Furthermore, an insulation treatment portion may be further included on the outer surface of the heat sink portion.

[0021] Furthermore, the present invention provides a battery pack, comprising: a battery cell; and the composite panel for a battery pack, disposed on at least one side of the battery cell.

[0022] Effects of the Invention

[0023] According to the present invention, the composite panel for a battery pack and the battery pack including the same can sense the temperature and expansion of the battery cell because they include a sensor portion, have excellent heat dissipation characteristics because they include a heat sink portion, and can easily adjust the temperature of the battery cell because the heating plate portion can generate a predetermined amount of heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1FIG. 1 is a schematic diagram of a composite panel for a battery pack according to an embodiment of the present invention.

[0025] Figure 2 FIG2 is a schematic cross-sectional view of a composite panel for a battery pack according to another embodiment of the present invention.

[0026] Figure 3 FIG. 1 is a cross-sectional schematic diagram of a battery pack according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail with reference to the accompanying drawings, so that those skilled in the art can easily implement the present invention. However, the present invention can be implemented in many different ways and is not limited to the embodiments described herein. In the accompanying drawings, portions not relevant to the description are omitted to clarify the present invention. Throughout the specification, identical or similar structural elements are given the same reference numerals.

[0028] like Figure 1 As shown, the composite panel 100 for a battery pack of the present invention is implemented in the following manner, that is, a composite panel for a battery pack is arranged on at least one side of a battery cell, and the composite panel 100 includes: a heat sink portion 110; a heating plate portion 120, including a heating circuit pattern formed in a predetermined area; and a sensor portion 130, for sensing one or more of the external temperature and expansion of the battery cell.

[0029] First, the heat sink portion 110 will be described.

[0030] The heat sink 110 is provided on the composite panel 100 for the battery pack and functions to regulate the temperature of the battery cells.

[0031] The heat sink 110 may be made of any material capable of regulating the temperature of the battery cells without limitation, but may preferably include at least one selected from the group consisting of heat dissipating plastic, carbon sheets, metal sheets, and ceramic sheets.

[0032] When the heat sink portion is formed of heat dissipation plastic, the heat dissipation plastic may include polymer resin and heat dissipation filler.

[0033] The polymer resin can be any resin that can support the heat dissipating filler and has minimal changes in physical properties due to heat generation. Preferably, the polymer resin can be one compound selected from the group consisting of polyamide, polyester, polyketone, liquid crystal polymer, polyolefin, polyphenylene sulfide (PPS), polyetheretherketone (PEEK), polyphenylene oxide (PPO), polyethersulfone (PES), polyetherimide (PEI), and polyimide, or a mixture or copolymer of two or more. The polyamide can be a known polyamide compound, such as nylon 6, nylon 66, nylon 11, nylon 610, nylon 12, nylon 46, nylon 9T (PA-9T), Qiana, and aromatic polyamide.

[0034] As an example, the polyester may be a known polyester compound, such as polyethylene terephthalate (PET), polypropylene terephthalate (PTT), polybutylene terephthalate (PBT), polycarbonate, and the like.

[0035] As another example, the polyolefin may be a known polyolefin compound, such as polyethylene, polypropylene, polystyrene, polyisobutylene, ethylene vinyl alcohol, and the like.

[0036] The liquid crystal polymer may be any polymer that exhibits liquid crystallinity in a solution or dissolved state without limitation and may be of a known type, and thus the present invention is not particularly limited thereto.

[0037] Moreover, the above-mentioned heat dissipation filler can use heat dissipation fillers commonly used in the art without restriction, and preferably can include one or more selected from the following groups: one or more metals selected from the group consisting of aluminum, silver, copper, nickel, gold and iron; one or more ceramics selected from the group consisting of silicon carbide, magnesium oxide, titanium dioxide, silicon dioxide, aluminum nitride, silicon nitride, boron nitride, aluminum oxide, zinc oxide, barium titanate, strontium titanate, beryllium oxide and manganese oxide; and one or more carbon materials selected from the group consisting of graphite, graphene, carbon nanotubes, fullerenes and carbon black.

[0038] On the other hand, when the heat sink portion includes a carbon sheet, the carbon sheet may be any carbon sheet commonly used in the art without limitation, and may preferably include a graphite sheet.

[0039] Moreover, when the heat sink portion includes a metal sheet, the metal sheet can be any metal sheet commonly used in the art without restriction, and can preferably include one or more selected from the group consisting of Ti, Sn, Au, Pt, Pd, Ni, Cu, Ag, Al, Zn and Fe, but is not limited thereto.

[0040] In addition, when the above-mentioned heat sink portion includes a ceramic sheet, the above-mentioned ceramic sheet can be made of a material commonly used in this field without restriction, and preferably can include one or more selected from the group consisting of silicon carbide, magnesium oxide, titanium dioxide, silicon dioxide, aluminum nitride, silicon nitride, boron nitride, aluminum oxide, zinc oxide, barium titanate, strontium titanate, beryllium oxide and manganese oxide, but is not limited thereto.

[0041] On the other hand, according to one embodiment of the present invention, an insulation treatment portion may be further included on the outer surface of the heat sink portion 110. In this case, since the insulation treatment portion may be formed by an insulation treatment method commonly used in the art, the present invention is not particularly limited thereto.

[0042] The insulating portion may be formed only on the outer surface of the heat sink 110 that contacts the battery cells 200 and / or the heating fins 120 and 121 , or may be formed on the entire outer surface.

[0043] On the other hand, Figure 2 As shown, the heat sink portion 111 may include a first heat sink portion 111 a and a second heat sink portion 111 b , and a heating fin portion 121 and a sensor portion 131 to be described later may be included between the first heat sink portion 111 a and the second heat sink portion 111 b .

[0044] Next, the heating sheet units 120 and 121 will be described.

[0045] The heating sheet portions 120 and 121 include a heating circuit pattern formed in a predetermined area on the support member, thereby preventing the battery temperature from decreasing.

[0046] In this case, the supporting member may be in a film or mesh shape, preferably in a film shape, to prevent a decrease in thermal conductivity due to pores.

[0047] When the supporting member is in a film shape, the supporting member may be made of any material commonly used in the art without limitation, and thus the present invention has no particular limitation thereto.

[0048] Furthermore, when the supporting member is in a mesh shape, the supporting member may be made of any material commonly used in the art without limitation, and preferably may include a material selected from the group consisting of polyurethane, polystyrene, polyvinylalcohol, polymethyl methacrylate, polylactic acid, polyethylene oxide, polyvinylacetate, polyacrylic acid, polycaprolactone, polyacrylonitrile, polyvinylpyrrolidone, polyvinylchloride, polycarbonate, polyetherimide, polyethersulfone, polybenzimidazol, polyethylene terephthalate, polybutylene terephthalate, and the like. One or more compounds selected from the group consisting of terephthalate) and fluorine compounds, but not limited thereto.

[0049] The heating circuit pattern can be formed by methods commonly used in the art, preferably by printing, electroplating, deposition, etc., but is not limited thereto. Furthermore, the heating circuit pattern can be formed from materials commonly used in the art, preferably including one or more metals selected from the group consisting of Ti, Sn, Au, Pt, Pd, Ni, Cu, Ag, Al, Zn, and Fe, but is not limited thereto.

[0050] On the other hand, the heating plate portion 121 may include a heating circuit pattern on one or both sides to contact at least one of the first heat sink portion 111a and the second heat sink portion 111b. Preferably, the heating circuit pattern is included on both sides to more easily adjust the temperature of the battery cell.

[0051] Furthermore, the heating sheet portion 121 may include a receiving portion for receiving a portion or all of the sensor portion 131 to be described later.

[0052] Next, the sensor units 130 and 131 will be described.

[0053] The sensor units 130 and 131 may include at least one of pressure sensors 130a and 131a and temperature sensors 130b and 131b. Preferably, the sensor units 130 and 131 include pressure sensors 130a and 131a and temperature sensors 130b and 131b, which may be more advantageous in sensing the expansion and temperature of the battery cells.

[0054] And, as Figure 1 and Figure 2 As shown, the pressure sensors 130a, 131a and the temperature sensors 130b, 131b provided in the sensor units 130, 131 may be arranged in contact with each other or may be arranged at a predetermined distance, but the present invention is not limited thereto.

[0055] On the other hand, Figure 1 As shown, the sensor portion 130 can be arranged adjacent to the heating plate portion 120. Preferably, a portion of the sensor portion 131 can be accommodated in the accommodating portion of the heating plate portion 121, or as shown in FIG. Figure 2 As shown, the entire sensor portion 131 can be housed within the housing of the heating plate portion 121. Consequently, due to the reduced protrusion of the sensor portion 131 (described later), the height difference is significantly reduced. Alternatively, because the sensor portion 131 does not protrude, the composite panel eliminates the height difference, improving the accuracy of battery cell expansion and temperature sensing. In particular, when the composite panel 101 for a battery pack of the present invention is positioned between adjacent battery cells, even if any of the adjacent battery cells expands and experiences a temperature drop, the panel can still sense this expansion and temperature drop.

[0056] On the other hand, Figure 3 As shown, the present invention provides a battery pack 1000 , comprising: a battery cell 200 ; and the composite panel 101 for a battery pack, which is disposed on at least one side of the battery cell 200 .

[0057] Since the composite panel 101 for the battery pack is arranged on at least one side of the battery cell 200, preferably on one side and the other side opposite to the one side, it can sense the expansion and temperature of the battery cell, has excellent heat dissipation characteristics, and since it can generate predetermined heat, it can show the effect of easily adjusting the temperature of the battery cell.

[0058] Furthermore, according to another embodiment of the present invention, a battery pack control system is provided, including: the battery pack described above; and a control unit electrically connected to the battery pack, configured to control temperature and sense expansion according to a sensed temperature.

[0059] In this case, the battery pack control system may further include a cable for electrically connecting the battery pack and the control unit. The cable may be any commonly used cable in the art without restriction, and thus the present invention has no particular limitation thereto.

[0060] Furthermore, the battery pack control system may further include a cooling unit disposed below the battery pack to reduce the battery pack temperature. The cooling unit may be any commonly used cooling unit in the art, and the present invention is not particularly limited thereto.

[0061] An embodiment of the present invention has been described above, but the concept of the present invention is not limited to the embodiment described in this specification. Ordinary technicians in this field who understand the concept of the present invention can easily propose other embodiments within the scope of the same concept by adding, changing, deleting, adding structural elements, etc., but this will also fall within the scope of the concept of the present invention.

Claims

1. A composite panel for a battery pack, provided on at least one side of a battery cell, characterized in that: include: The heat sink portion includes a first heat sink portion and a second heat sink portion; The heating fin portion includes a heating circuit pattern formed on one or both surfaces in a manner of contacting at least one of the first heat sink portion and the second heat sink portion; as well as The sensor unit includes a pressure sensor and a temperature sensor, and is used to sense at least one of the external temperature and expansion of the battery cell. The heat sink portion includes the heater portion and the sensor portion between the first heat sink portion and the second heat sink portion.

2. The composite panel for a battery pack according to claim 1, characterized in that: The sensor portion is provided adjacent to the heater sheet portion.

3. The composite panel for a battery pack according to claim 1, characterized in that: The heating plate portion includes a receiving portion for receiving a portion or all of the sensor portion. A part or the entirety of the sensor unit is housed in the housing portion.

4. The composite panel for a battery pack according to claim 1, characterized in that: The heat sink portion includes at least one selected from the group consisting of heat dissipating plastic, carbon sheet, metal sheet and ceramic sheet.

5. The composite panel for a battery pack according to claim 4, characterized in that: The carbon sheet mentioned above includes a graphite sheet.

6. The composite panel for a battery pack according to claim 4, characterized in that: The heat dissipation plastic comprises polymer resin and heat dissipation filler.

7. The composite panel for a battery pack according to claim 1, characterized in that: An insulating portion is further included on the outer surface of the heat sink portion.

8. A battery pack, characterized in that: include: Battery cells; as well as The composite panel for a battery pack according to any one of claims 1 to 7 is provided on at least one side of the battery cell.

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