Battery cell and battery device

Abstract

The battery cell according to one embodiment of the present invention comprises: a battery cell housing; the positive terminal is arranged on one side of the exterior of the battery cell shell and is insulated from the battery cell shell; the negative terminal is separated from the positive terminal, is arranged on the other side of the exterior of the battery cell shell and is insulated from the battery cell shell; the battery cell material part is arranged in the battery cell shell and is provided with a positive electrode lug electrically connected with the positive terminal and a negative electrode lug electrically connected with the negative terminal; the fuse is electrically connected with the positive terminal and the positive tab, and is disconnected during working so as to separate the positive terminal from the positive tab branch; and the connecting part is used for electrically connecting the positive pole lug of the battery cell material part with the battery cell shell.

Description

TECHNICAL FIELD

[0001] The present application relates to an electric cell having a reverse potential prevention function and a battery device. BACKGROUND

[0002] Generally, a battery for a power source of an electric vehicle (EV), an energy storage system, etc. can be composed in the form of a battery pack, and such a battery pack can include a plurality of battery modules, and each of the plurality of battery modules can include a plurality of electric cells.

[0003] Such a battery can be applied to an electric vehicle, etc., and can include a battery management system (BMS) having a circuit for managing charging and discharging of the battery.

[0004] The electric cell can be composed in various forms, for example, there can be prismatic, cylindrical, and pouch, etc.

[0005] In the existing prismatic electric cell, in order to form polarity on the electric cell case, the electric cell case is directly connected to the cathode terminal. The connection position of the electric cell case is directly below the cathode terminal.

[0006] As an example, each of the plurality of electric cells can include a cell fuse connected between the cathode terminal and the cell material portion (for example, a jelly-roll type electrode assembly) of the electric cell. In this case, the connection position of the electric cell case can become a conductor connecting the cell fuse and the cathode terminal.

[0007] However, for example, when the battery device includes a plurality of electric cells including a second electric cell connected to a first electric cell, in a case where the cathode terminal of the second electric cell is connected to the electric cell case of the second electric cell while being connected to the anode terminal of the first electric cell, if the fuse of the second electric cell operates and is disconnected, since the anode terminal of the first electric cell is connected to the cathode terminal of the second electric cell, and in addition, the electric cell case of the second electric cell is connected to the cathode terminal of the second electric cell, finally the electric cell case of the second electric cell will be connected to the anode terminal of the first electric cell, so that the electric cell case of the second electric cell becomes the anode, thereby possibly causing a stability problem.

[0008] That is, if a defect of the battery module causes the cell fuse to operate and be disconnected, the polarity of the electric cell case will become the anode, and thus there is a problem that a reverse potential is generated in the electric cell including the disconnected cell fuse. SUMMARY

[0009] (1) Technical problem to be solved

[0010] One technical problem to be solved by the present application is to provide an electric cell and a battery device in which the polarity of the cell case can be maintained as positive (+) or negative (-) regardless of whether the fuse of each electric cell is working or not, thereby preventing reverse potential of the cell case.

[0011] (II) Technical Solution

[0012] According to one embodiment of the present application, an electric cell is provided, including: a cell case; a positive terminal disposed at one outer side of the cell case and insulated from the cell case; a negative terminal spaced apart from the positive terminal and disposed at the other outer side of the cell case and insulated from the cell case; a cell material portion disposed inside the cell case and having a positive tab electrically connected to the positive terminal and a negative tab electrically connected to the negative terminal; a fuse electrically connected to the positive terminal and the positive tab and broken to separate the positive terminal and the positive tab from each other when working; and a connection portion electrically connecting the positive tab of the cell material portion to the cell case.

[0013] In addition, according to another embodiment of the present application, a battery device is provided, including: a case; and a plurality of electric cells disposed inside the case and electrically connected to each other, at least one of the plurality of electric cells including: a cell case; a positive terminal disposed at one outer side of the cell case and insulated from the cell case; a negative terminal spaced apart from the positive terminal and disposed at the other outer side of the cell case and insulated from the cell case; a cell material portion disposed inside the cell case and having a positive tab electrically connected to the positive terminal and a negative tab electrically connected to the negative terminal; a fuse electrically connected to the positive terminal and the positive tab and broken to separate the positive terminal and the positive tab from each other when working; and a connection portion electrically connecting the positive tab of the cell material portion to the cell case.

[0014] In addition, according to another embodiment of the present application, an electric cell is provided, including: an electric cell case; an electric cell material portion disposed inside the electric cell case in an insulated state from the electric cell case and having a positive electrode tab disposed at one side and a negative electrode tab disposed at the other side opposite to the one side; a positive electrode current collector disposed on the positive electrode tab in a connected state with the electric cell case; a negative electrode current collector disposed on the negative electrode tab in an insulated state from the electric cell case; a positive electrode cover disposed at one side of the electric cell case in a connected state with the electric cell case and covering the positive electrode current collector; a positive electrode terminal inserted into a through hole formed in the positive electrode cover; a fuse disposed between an inner side surface of the positive electrode terminal and the positive electrode current collector; and a connection portion electrically connecting the positive electrode current collector and the electric cell case.

[0015] In addition, according to another embodiment of the present application, an electric cell is provided, including: an electric cell case; an electric cell material portion disposed inside the electric cell case in an insulated state from the electric cell case and having a positive electrode tab disposed at one side and a negative electrode tab disposed at the other side opposite to the one side; a negative electrode current collector disposed on the negative electrode tab in a connected state with the electric cell case; a positive electrode current collector disposed on the positive electrode tab in an insulated state from the electric cell case; a negative electrode cover disposed at one side of the electric cell case in a connected state with the electric cell case and covering the negative electrode current collector; a negative electrode terminal inserted into a through hole formed in the negative electrode cover; a fuse disposed between an inner side surface of the negative electrode terminal and the negative electrode current collector; and a connection portion electrically connecting the negative electrode current collector and the electric cell case.

[0016] (Three) Advantageous Effects

[0017] According to one embodiment of the present application, in a battery device including a plurality of electric cells, even in a case where a fuse included in any one of the electric cells is disconnected, by maintaining the electric cell case of the electric cell having the disconnected fuse in a positive (+) polarity or a negative (-) polarity, a reverse potential of the electric cell occurring when the fuse is disconnected can be prevented, and thus stability of the battery can be improved even when the fuse is disconnected. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is an example view of an electric cell according to one embodiment of the present application.

[0019] Figure 2 is an example view of an electric cell according to one embodiment of the present application.

[0020] Figure 3 is an example view of a battery device according to one embodiment of the present application.

[0021] Figure 4 is a first structural example diagram of an electric cell.

[0022] Figure 5 is a second structural example diagram of an electric cell.

[0023] Figure 6 is an enlarged example diagram of an A area including a first insulating portion of Figure 4

[0024] Figure 7 is an enlarged example diagram of a B area including a second insulating portion of Figure 4

[0025] Figure 8 is an example diagram of an internal connection structure of an electric cell before a fuse operates.

[0026] Figure 9 is an example diagram of an internal connection structure of an electric cell after a fuse operates.

[0027] Figure 10 is an example diagram of an internal connection structure of a battery device before a fuse operates.

[0028] Figure 11 is an example diagram of an internal connection structure of a battery module after a fuse operates.

[0029] Figure 12 is an example diagram of a first connection structure between electric cells of a battery device.

[0030] Figure 13 is an example diagram of a second connection structure between electric cells of a battery device.

[0031] Figure 14 is an example diagram of an electric cell according to one embodiment of the present application.

[0032] Figure 15 is an example diagram of a cylindrical structure of an electric cell according to one embodiment of the present application.

[0033] Figure 16 is another example diagram of a cylindrical structure of an electric cell according to one embodiment of the present application. DETAILED DESCRIPTION

[0034] Hereinafter, the present application is not limited to the illustrated embodiments, and it should be understood that various changes can be made without departing from the spirit and scope of the present application.

[0035] ​​In addition, in each of the embodiments of the present application, the structures, shapes, and numerical values illustrated as examples are merely examples to help understand the technical matters of the present application, and are not limited thereto, and it should be understood that various changes can be made without departing from the spirit and scope of the present application. The embodiments of the present application can be combined with each other to form various new embodiments.

[0036] In addition, in the drawings of the present application, components having substantially the same structure and function will use the same reference numerals in accordance with the overall contents of the present application.

[0037] Hereinafter, for the ordinary skilled person in the art to which the present application pertains to be able to easily implement the present application, embodiments of the present application are described in detail with reference to the accompanying drawings.

[0038] Figure 1 is an example view of a battery cell according to an embodiment of the present application.

[0039] Referring to Figure 1 A battery cell 100-1 according to an embodiment of the present application can include a battery cell case CA1, a positive terminal T11, a negative terminal T12, a battery cell material portion CM1, a fuse FU1, and a connection portion CNT1.

[0040] The battery cell case CA1 can include the battery cell material portion CM1, the fuse FU1, and the connection portion CNT1 inside, and the positive terminal T11 and the negative terminal T12 can be disposed outside thereof.

[0041] The positive terminal T11 can be disposed at an outer side of the battery cell case CA1 and insulated from the battery cell case CA1. The negative terminal T12 is spaced apart from the positive terminal T11 and can be disposed at the other outer side of the battery cell case CA1 and insulated from the battery cell case CA1. For example, the positive terminal T11 and the negative terminal T12 can include an electrically conductive material. As an example, the positive terminal T11 can include aluminum (Al), and the negative terminal T12 can include copper (Cu), but is not limited to these examples.

[0042] The cell material portion CM1 is disposed inside the cell case CA1, and can include a positive tab TP11 electrically connected to the positive terminal T11 and a negative tab TP12 electrically connected to the negative terminal T12. For example, the positive tab TP11 and the negative tab TP12 can include an electrically conductive material. As one example, the positive tab TP11 can include Aluminum, and the negative tab TP12 can include Copper, but is not limited to these examples. For example, the cell material portion CM1 can include a positive material connected to the positive tab TP11, a separator, and a negative material connected to the negative tab TP12, and as one example, the cell material portion CM1 can include a jelly roll, but is not limited thereto.

[0043] The fuse FU1 can electrically connect the positive terminal T11 to the positive tab TP11. When the battery is in a normal state without defects, the positive terminal T11 can be electrically connected to the positive tab TP11 through the fuse FU1. However, when the battery is in an abnormal state with defects, the fuse FU1 operates and is disconnected, so that the first wire W11 can be electrically separated, and thus the positive terminal T11 and the positive tab TP11 can be separated.

[0044] The connection portion CNT1 can electrically connect the positive tab TP11 of the cell material portion CM1 to the cell case CA1 to maintain the cell case CA1 as positive. For example, the connection portion CNT1 can always electrically connect the positive terminal T11 to the cell case CA1 regardless of whether the fuse FU1 operates. For example, the connection portion CNT1 can include an electrically conductive material. As one example, the connection portion CNT1 can include Aluminum, but is not limited thereto.

[0045] In addition, the cell 100-1 can include a first wire W11, a second wire W12, a first insulation portion IS1, and a second insulation portion IS2.

[0046] The first wire W11 can electrically connect the positive terminal T11 to the positive tab TP11 through the fuse FU1. The second wire W12 can electrically connect the negative terminal T12 to the negative tab TP12. For example, the first wire W11 and the second wire W12 can include an electrically conductive material. As one example, the first wire W11 can include Aluminum, and the second wire W12 can include Copper, but is not limited thereto.

[0047] The first insulating portion IS1 can separate the positive terminal T11 and the first lead wire W11 from the battery case CA1. Also, the second insulating portion IS2 can separate the negative terminal T12 and the second lead wire W12 from the battery case CA1. For example, the first insulating portion IS1 and the second insulating portion IS2 can include an insulating material such as plastic, but are not limited thereto.

[0048] The first insulating portion IS1 and the second insulating portion IS2 will be described in more detail with reference to Figure 6 and Figure 7 .

[0049] The connecting portion CNT1 is directly or indirectly electrically connected to the positive tab TP11 of the battery material portion CM1, so that the battery case CA1 can be connected to the positive tab TP11 of the battery material portion CM1 through the connecting portion CNT1 regardless of whether the fuse FU1 is operating, to maintain the battery case CA1 at a positive potential.

[0050] Figure 2 is an example view of a battery according to an embodiment of the present application.

[0051] With reference to Figure 2 , a battery 100-1' according to an embodiment of the present application is formed in almost the same structure as the battery 100-1 shown in Figure 2 , except for a part of the structure, and thus will be described focusing on the different structure. Figure 1 Compared to the battery 100-1 shown in

[0052] , in the battery 100-1', the positive terminal T11 and the positive tab TP11 are disposed at the same position, and the negative terminal T12 and the negative tab TP12 are disposed at a position different from that of the positive terminal T11 and the positive tab TP11. Figure 1 Figure 2 For example, the negative terminal T12 can be disposed at the other side of the outside of the battery case CA1, which is the opposite side of the side of the battery case CA1 where the positive terminal T11 is disposed.

[0053] Also, the negative terminal T12 can be disposed at the other side of the battery material portion CM1, which is the opposite side of the side of the battery material portion CM1 where the positive terminal T11 is disposed.

[0054] Also, the negative terminal T12 can be disposed at the other side of the battery material portion CM1, which is the opposite side of the side of the battery material portion CM1 where the positive terminal T11 is disposed.

[0055] Figure 1 and Figure 2 ​The arrangement positions of the positive terminal T11, the negative terminal T12, the positive tab TP11, and the negative tab TP12 shown are merely examples, and thus are not limited to these examples. The positive terminal T11 and the negative terminal T12 can be arranged on the outer surface of the cell case CA1 without being limited to specific positions. The positive tab TP11 and the negative tab TP12 can be arranged on the outer side surface of the cell material portion CM1 without being limited to specific positions.

[0056] Examples of the connection portion are shown in Figure 4 and Figure 5 .

[0057] Hereinafter, in the present disclosure, the structure shown in Figure 1 will be described as a basic structure. However, this is merely for convenience of explanation and understanding, and is not limited thereto.

[0058] For each drawing of the present application, unnecessary repeated explanation of the same reference numerals and components having the same function can be omitted as much as possible, and differences of each drawing can be explained as much as possible.

[0059] Figure 3 is an example view of a battery device according to one embodiment of the present application.

[0060] Referring to Figure 3 , a battery device 100 according to one embodiment of the present application can include a housing 101 and a plurality of cells 100-1, 100-2, 100-3, …. For example, the battery device 100 can be an energy storage device. As one example, the battery device 100 can be a battery module or a battery pack.

[0061] The housing 101 can be an outer case of the battery device 100.

[0062] At least one or each of the plurality of cells 100-1, 100-2, 100-3, … can include a cell case CA1, a positive terminal T11, a negative terminal T12, a cell material portion CM1, a fuse FU1, and a connection portion CNT1.

[0063] In addition, at least one or each of the plurality of cells 100-1, 100-2, 100-3, … can be formed in the same structure as the cell 100-1 shown in Figure 1 , and thus explanation of the same content as that with reference to Figure 1 will be omitted.

[0064] On the other hand, the battery device 100 can include a plurality of cells, and in the present specification, for convenience of explanation and understanding, a case where the battery device 100 includes a first cell 100-1, a second cell 100-2, and a third cell 100-3 can be explained, but is not limited thereto.

[0065] For example, when the battery device 100 includes the first cell 100-1, the second cell 100-2, and the third cell 100-3, the positive terminal T21 of the second cell 100-2 can be connected to the negative terminal T12 of the first cell 100-1, and the negative terminal T22 of the second cell 100-2 can be connected to the positive terminal T31 of the third cell 100-3.

[0066] Through this connection method, the plurality of cells 100-1~100-3, … can be connected in series with each other, but is not limited to this series connection structure.

[0067] Hereinafter, in the present disclosure, among the plurality of cells 100-1~100-3, …, for the convenience of explanation and understanding, the cell 100-1 is exemplified and explained, but such explanation of the cell 100-1 can be applied to each of the plurality of cells 100-1~100-3, …, and thus repeated explanation of other cells formed in the same structure can be omitted.

[0068] Referring to Figure 4 and Figure 5 , an embodiment in which the cell case CA1 is connected to the positive tab TP11 of the cell material portion CM1 to maintain the positive (+) polarity is explained.

[0069] Figure 4 is a first structure example view between cells, Figure 5 is a second structure example view of a cell. Referring to Figure 4 , the connection portion CNT1 can be connected to the first wire W11, and the first wire W11 can be connected to the positive tab TP11 of the cell material portion CM1, and thus the connection portion CNT1 can be electrically connected to the positive tab TP11 of the cell material portion CM1 through the first wire W11.

[0070] For example, one end of the connection portion CNT1 can be connected to the cell case CA1, and the other end of the connection portion CNT1 can be connected to the positive tab TP11 of the cell material portion CM1 through the first wire W11.

[0071] Referring to Figure 5 , the connection portion CNT1 can be directly electrically connected to the positive terminal T11 of the cell material portion CM1 without passing through the first wire W11.

[0072] For example, one end of the connection portion CNT1 can be connected to the cell case CA1, and the other end of the connection portion CNT1 can be directly connected to the positive tab TP11 of the cell material portion CM1 without passing through the first wire W11.

[0073] Figure 6 is an enlarged example view of an A area including a first insulating portion of Figure 4 ,Figure 7 is an enlarged view of a B region including Figure 4 a second insulating portion.

[0074] Referring to Figure 6 , the first insulating portion IS1 can include a first through-hole H11 and a first extension IS1-1.

[0075] The first lead wire W11 passes through the first through-hole H11 to connect the positive terminal T11 and the positive tab TP11, and thus the positive tab TP11 and the positive terminal T11 can be connected to each other by the first lead wire W11.

[0076] The first insulating portion IS1 can extend from a position between the battery case CA1 and the positive terminal T11 to a space between the battery case CA1 and the first lead wire W11 through the first extension IS1-1.

[0077] Thus, the positive terminal T11 can be electrically separated from the battery case CA1 by the first insulating portion IS1, and the first lead wire W11 can be electrically separated from the battery case CA1 by the first extension IS1-1.

[0078] Referring to Figure 7 , the second insulating portion IS2 can include a second through-hole H12 and a second extension IS1-2.

[0079] The second lead wire W12 passes through the second through-hole H12 to connect the negative terminal T12 and the negative tab TP12, and thus the negative tab TP12 and the negative terminal T12 can be connected to each other by the second lead wire W12.

[0080] The second insulating portion IS2 can extend from a position between the battery case CA1 and the negative terminal T12 to a space between the battery case CA1 and the second lead wire W12 through the second extension IS1-2.

[0081] Thus, the negative terminal T12 can be electrically separated from the battery case CA1 by the second insulating portion IS2, and the second lead wire W12 can be electrically separated from the battery case CA1 by the second extension IS1-2.

[0082] Figure 8 is an example view of an internal connection structure of a battery before a fuse operates, Figure 9 is an example view of an internal connection structure of a battery after a fuse operates.

[0083] Referring to Figure 8 , in one unit battery 100-1, before a fuse FU1 operates, the battery case CA1 is connected to a battery material portion CM1 through a connection portion CNT1.

[0084] Referring to Figure 9 In one unit cell 100-1, it can be known that even after the fuse FU1 operates, the cell case CA1 is connected to the cell material portion CM1 through the connection portion CNT1.

[0085] Figure 10 is an example of an internal connection structure of a battery device before the fuse operates, Figure 11 is an example of an internal connection structure of a battery module after the fuse operates.

[0086] Referring to Figure 10 When the battery device 100 includes the first cell 100-1, the second cell 100-2, and the third cell 100-3, before the fuses FU1, FU2, and FU3 operate, the cell cases CA1, CA2, and CA3 of the first cell 100-1, the second cell 100-2, and the third cell 100-3 are connected to the cell material portions CM1, CM2, and CM3 through the connection portions CNT1, CNT2, and CNT3, respectively.

[0087] Referring to Figure 11 When the battery device 100 includes the first cell 100-1, the second cell 100-2, and the third cell 100-3, after the fuse FU2 in the second cell 100-2 operates, the cell cases CA1, CA2, and CA3 of the first cell 100-1 and the third cell 100-3 and the second cell 100-2 are also connected to the cell material portions CM1, CM2, and CM3 through each of the connection portions CNT1, CNT2, and CNT3, respectively.

[0088] Figure 12 is an example of a first connection structure between cells of a battery device, Figure 13 is an example of a second connection structure between cells of a battery device.

[0089] Referring to Figure 12 When the battery device 100 is a battery module, the battery module can include a plurality of cells 100-1, 100-2, 100-3 connected in series.

[0090] Referring to Figure 13 The battery module can include a structure in which one group of cells 100-G1 connected in series and another group of cells 100-G2 connected in parallel to each other.

[0091] In addition, the plurality of cells 100-1, 100-2, 100-3 of one group of cells 100-G1 can be connected in series to each other, and the cells 100-1', 100-2', 100-3' of another group of cells 100-G1 can be connected in series to each other.

[0092] Referring to the Figures 1 to 13, the technical feature of setting a fuse between the positive terminal and the positive electrode tab, and electrically connecting the positive electrode tab to the battery cell shell so that the battery cell shell maintains a positive (+) potential is described, but this is only an example and does not need to be limited to this. As an example, the technical feature of setting a fuse between the negative terminal and the negative electrode tab, and electrically connecting the negative electrode tab to the battery cell shell so that the battery cell shell maintains a negative (-) potential can also be included in the scope and matters of this disclosure. In this regard, reference will be made to Figure 14 Provide explanation.

[0093] Figure 14 FIG. 1 is an exemplary diagram of a battery cell according to an embodiment of the present invention.

[0094] Reference Figure 14 The battery cell 100 - 11 according to one embodiment of the present invention may include a battery cell case CA1 , a positive terminal T11 , a negative terminal T12 , a battery cell material portion CM1 , a fuse FU2 , and a connection portion CNT2 . Figure 14 The battery cell 100-11 shown is Figure 1 The difference of the battery cell 100 - 1 shown is the arrangement positions of the fuse FU2 and the connection portion CNT2 . Therefore, repeated description will be omitted and only the differences will be described.

[0095] Fuse FU2 can electrically connect the negative electrode tab T12 to the negative electrode tab TP12. Furthermore, connector CNT2 can electrically connect the negative electrode tab T12 of the cell material unit CM1 to the cell case CA1, maintaining the negative electrode of the cell case CA1. For example, connector CNT2 can always electrically connect the negative electrode terminal T12 to the cell case CA1, regardless of whether fuse FU2 is activated or not. For example, connector CNT2 can comprise a conductive material. As an example, connector CNT2 can comprise aluminum, but is not limited thereto.

[0096] In addition, refer to Figures 1 to 14 The above-mentioned battery cell can be applied to a quadrilateral structure. This is for the convenience of explanation and understanding. The battery cell disclosed in the present invention is not limited to a quadrilateral structure, but can also be formed in various structures. Figure 15 and Figure 16 , explaining the cylindrical structure of the battery cell.

[0097] In addition, in reference Figures 1 to 14 In the description, if it is in accordance with Figure 15 and Figure 16 The contents of the battery cell shown can be applied to the following description.

[0098] Figure 15 FIG. 1 is an exemplary diagram of a cylindrical structure of a battery cell according to an embodiment of the present invention.

[0099] Referring to Figure 15 An electric cell 100-10 according to an embodiment of the present application can include an electric cell case CA5, an electric cell material part CM5, a cathode current collector CCC1, an anode current collector ACC1, a cathode cover CCP1, a cathode terminal T50, a cathode tab TP51, an anode cover ACP1, an anode terminal T60, an anode tab TP61, a first cathode insulation part IS50, a first anode insulation part IS60, a fuse FU5, and a connection part CNT50.

[0100] The electric cell case CA5 can be formed in a cylindrical structure, and can include the electric cell material part CM5, the fuse FU5, and the connection part CNT50 inside, and the cathode terminal T50 and the anode terminal T60 can be disposed outside thereof.

[0101] The electric cell material part CM5 can be disposed inside the electric cell case CA5 in an insulated state from the electric cell case CA5, and can include the cathode tab TP51 disposed at one side and the anode tab TP61 disposed at the other side opposite to the one side.

[0102] The cathode current collector CCC1 can be disposed on the cathode tab TP51 in a connected state with the electric cell case CA5. The anode current collector ACC1 can be disposed on the anode tab TP61 in an insulated state from the electric cell case CA5.

[0103] The cathode cover CCP1 can be disposed at one side of the electric cell case CA5 in a connected state with the electric cell case CA5, and can cover the cathode current collector CCC1. The anode cover ACP1 can be disposed at the other side of the electric cell case CA5 in a connected state with the electric cell case CA5, and can cover the anode current collector ACC1.

[0104] The cathode terminal T50 can be inserted into a through hole H50 formed in the cathode cover CCP1. The anode terminal T60 can be inserted into a through hole H60 formed in the anode cover ACP1.

[0105] The first cathode insulation part IS50 can be disposed between the cathode terminal T50 and the through hole H50 of the cathode cover CCP1. The first anode insulation part IS60 can be disposed between the anode terminal T60 and the through hole H60 of the anode cover ACP1.

[0106] The fuse FU5 can be disposed between the inner side surface of the positive terminal T50 and the positive current collector CCC1. The connection part CNT50 can electrically connect the positive current collector CCC1 and the cell case CA5. As one example, the connection part CNT50 can be a welding part formed by welding, but is not limited thereto.

[0107] In addition, referring to Figure 15 , the first negative insulating part IS60 can include a first insulating part IS61 and a second insulating part IS62.

[0108] The first insulating part IS61 can be disposed between the inner side surface of the negative terminal T60 and the through hole H60 of the negative cap ACP1, and the second insulating part IS62 can be disposed at the inner side outer circumferential part of the negative terminal T60 in a state of being connected to the first insulating part IS61.

[0109] In general, the positive current collector CCC1 and the negative current collector ACC1 can each be made of a low-resistance material, and thus can function as a current collector that transfers current between the corresponding tab and the corresponding terminal.

[0110] Referring to Figure 15 The connection part CNT50 directly or indirectly electrically connects the positive tab TP51 of the cell material part CM1 and the cell case CA5 through the positive current collector CCC1, and thus the cell case CA5 can be connected to the positive tab TP51 of the cell material part CM5 through the connection part CNT50 regardless of whether the fuse FU5 is operating, so that the cell case CA5 is maintained at a positive (+) potential.

[0111] Figure 16 is another example view of a cylindrical structure of a cell according to an embodiment of the present application.

[0112] Referring to Figure 16 A cell 100-20 according to an embodiment of the present application can include a cell case CA7, a cell material part CM7, a negative current collector ACC2, a positive current collector CCC2, a negative cap ACP2, a negative terminal T70, a negative tab TP71, a positive cap CCP2, a positive terminal T80, a positive tab TP81, a second negative insulating part IS50, a second positive insulating part IS80, a fuse FU7, and a connection part CNT70.

[0113] The cell case CA7 can be formed in a cylindrical structure, and can include the cell material part CM7, the fuse FU7, and the connection part CNT70 inside, and the negative terminal T70 and the positive terminal T80 can be disposed outside thereof.

[0114] The cell material portion CM7 can be disposed inside the cell case CA7 in an insulating state from the cell case CA7, and can include a negative electrode tab TP71 disposed at one side and a positive electrode tab TP81 disposed at the other side opposite to the one side.

[0115] The negative current collector ACC2 can be disposed on the negative electrode tab TP71 in a state of being connected to the cell case CA7. The positive current collector CCC2 can be disposed on the positive electrode tab TP81 in a state of being insulated from the cell case CA7.

[0116] The negative cover ACP2 can be disposed at the other side of the cell case CA7 in a state of being connected to the cell case CA7, and can cover the negative current collector ACC2. The positive cover CCP2 can be disposed at the one side of the cell case CA7 in a state of being connected to the cell case CA7, and can cover the positive current collector CCC2.

[0117] The negative terminal T70 can be inserted into the through hole H70 formed in the negative cover ACP2. The positive terminal T80 can be inserted into the through hole H80 formed in the positive cover CCP2.

[0118] The second negative insulating portion IS50 can be disposed between the negative terminal T70 and the through hole H70 of the negative cover ACP2. The second positive insulating portion IS80 can be disposed between the positive terminal T80 and the through hole H80 of the positive cover CCP2.

[0119] The fuse FU7 can be disposed between the inner side surface of the negative terminal T70 and the negative current collector ACC2. The connection portion CNT70 can electrically connect the negative current collector ACC2 and the cell case CA7. As one example, the connection portion CNT70 can be a welding portion formed by welding, but is not limited thereto.

[0120] In addition, referring to Figure 16 , the second positive insulating portion IS80 can include a first insulating portion IS81 and a second insulating portion IS82.

[0121] The first insulating portion IS81 can be disposed between the inner side surface of the positive terminal T80 and the through hole H80 of the positive cover CCP2, and the second insulating portion IS82 can be disposed at the inner side peripheral portion of the positive terminal T80 in a state of being connected to the first insulating portion IS81.

[0122] Referring to Figure 16The connecting portion CNT70 electrically connects the negative tab TP71 of the core material portion CM7 to the core case CA7 directly or indirectly through the negative current collector ACC2, so that the core case CA7 is kept at a negative (-) potential by the connecting portion CNT70 connecting the core case CA7 to the negative tab TP71 of the core material portion CM7, regardless of whether the fuse FU7 is operating or not.

[0123] The present application has been described above by way of examples, but the present application is not limited to the above-described examples, and any person skilled in the art can make various modifications without departing from the gist of the present application requested by the claims.

Claims

1. An electric cell comprising: an electric cell case; a positive terminal provided at an outer side of the electric cell case and insulated from the electric cell case; a negative terminal provided at an outer side opposite to the positive terminal and insulated from the electric cell case; an electric cell material portion provided at an inner side of the electric cell case and having a positive tab electrically connected to the positive terminal and a negative tab electrically connected to the negative terminal; a fuse electrically connected to the positive terminal and the positive tab and operable to be broken to separate the positive terminal and the positive tab from each other; and a connection portion electrically connecting the positive tab of the electric cell material portion to the electric cell case. 2.The electric cell according to claim 1, further comprising: a first lead wire electrically connecting the positive terminal to the positive tab through the fuse; and a second lead wire electrically connecting the negative terminal to the negative tab. 3.The electric cell according to claim 2, further comprising: a first insulation portion separating the positive terminal and the first lead wire from the electric cell case; and a second insulation portion separating the negative terminal and the second lead wire from the electric cell case. 4.The electric cell according to claim 2, wherein the connection portion is electrically connected to the positive tab of the electric cell material portion through the first lead wire. 5.The electric cell according to claim 1, wherein the connection portion is directly electrically connected to the positive terminal of the electric cell material portion. 6.The electric cell according to claim 3, wherein the first insulation portion includes: a first through-hole through which the first lead wire passes to connect the positive terminal and the positive tab; and a first extension portion extending from a position between the electric cell case and the positive terminal to a space between the electric cell case and the first lead wire. 7.The electric cell according to claim 3, wherein the second insulation portion includes: a second through-hole through which the second lead wire passes to connect the negative terminal and the negative tab; and a second extension portion extending from a position between the electric cell case and the negative terminal to a space between the electric cell case and the second lead wire. 8.A battery device comprising: a housing; and a plurality of electric cells provided at an inner side of the housing and electrically connected to each other, at least one electric cell of the plurality of electric cells including: an electric cell case; a positive terminal provided at an outer side of the electric cell case and insulated from the electric cell case; a negative terminal provided at an outer side opposite to the positive terminal and insulated from the electric cell case; an electric cell material portion provided at an inner side of the electric cell case and having a positive tab electrically connected to the positive terminal and a negative tab electrically connected to the negative terminal; a fuse electrically connected to the positive terminal and the positive tab and operable to be broken to separate the positive terminal and the positive tab from each other; and a connection portion electrically connecting the positive tab of the electric cell material portion to the electric cell case. 9.The battery device according to claim 8, further comprising: ​ ​ ​ a first lead wire electrically connecting the positive terminal and the positive tab through the fuse; and a second lead wire electrically connecting the negative terminal and the negative tab.

10. The battery device according to claim 9, further comprising: a first insulating portion separating the positive terminal and the first lead wire from the cell case; and a second insulating portion separating the negative terminal and the second lead wire from the cell case.

11. The battery device according to claim 8, wherein the connecting portion is directly electrically connected to the positive terminal of the cell material portion.

12. The battery device according to claim 9, wherein the connecting portion is electrically connected to the positive tab of the cell material portion through the first lead wire.

13. The battery device according to claim 10, wherein the first insulating portion includes: a first through-hole through which the first lead wire passes to connect the positive terminal and the positive tab; and a first extension portion extending from a position between the cell case and the positive terminal to a space between the cell case and the first lead wire.

14. The battery device according to claim 10, wherein the second insulating portion includes: a second through-hole through which the second lead wire passes to connect the negative terminal and the negative tab; and a second extension portion extending from a position between the cell case and the negative terminal to a space between the cell case and the second lead wire.

15. A cell, comprising: a cell case; a cell material portion disposed inside the cell case in a state of being insulated from the cell case, and having a positive tab disposed at one side and a negative tab disposed at the other side opposite to the one side; a positive current collector disposed on the positive tab in a state of being connected to the cell case; a negative current collector disposed on the negative tab in a state of being insulated from the cell case; a positive cover disposed at one side of the cell case in a state of being connected to the cell case, and covering the positive current collector; a positive terminal inserted into a through-hole formed in the positive cover; a fuse disposed between an inner side surface of the positive terminal and the positive current collector; and a connecting portion electrically connecting the positive current collector and the cell case.

16. The cell according to claim 15, further comprising: a negative cover disposed at the other side of the cell case in a state of being connected to the cell case, and covering the negative current collector; a negative terminal inserted into a through-hole formed in the negative cover; a first positive insulating portion disposed between the positive terminal and the through-hole of the positive cover; and a first negative insulating portion disposed between the negative terminal and the through-hole of the negative cover.

17. The cell according to claim 16, wherein the first negative insulating portion includes: a first insulating portion disposed between an inner side surface of the negative terminal and the through-hole of the negative cover; and a second insulating portion disposed at an inner peripheral portion of the negative terminal in a state of being connected to the first insulating portion.

18. A cell, comprising: An electrode assembly includes: an electrode case; an electrode material portion disposed inside the electrode case in an insulating state from the electrode case and having a negative electrode tab disposed at one side and a positive electrode tab disposed at the other side opposite to the one side; a negative electrode current collector disposed on the negative electrode tab in a connected state with the electrode case; a positive electrode current collector disposed on the positive electrode tab in an insulating state from the electrode case; a negative electrode cover disposed at the one side of the electrode case in a connected state with the electrode case and covering the negative electrode current collector; a negative electrode terminal inserted into a through hole formed in the negative electrode cover; a fuse disposed between an inner side surface of the negative electrode terminal and the negative electrode current collector; and a connection portion electrically connecting the negative electrode current collector and the electrode case.

19. The electrode assembly of claim 18, further comprising: a positive electrode cover disposed at the other side of the electrode case in a connected state with the electrode case and covering the positive electrode current collector; a positive electrode terminal inserted into a through hole formed in the positive electrode cover; a second negative electrode insulating portion disposed between the negative electrode terminal and the through hole of the negative electrode cover; and a second positive electrode insulating portion disposed between the positive electrode terminal and the through hole of the positive electrode cover.

20. The electrode assembly of claim 19, wherein: the second positive electrode insulating portion includes: a first insulating portion disposed between an inner side surface of the positive electrode terminal and the through hole of the positive electrode cover; and a second insulating portion disposed at an inner side outer circumferential portion of the positive electrode terminal in a connected state with the first insulating portion.

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