Patent Description:
In the related art, the positive current collector and the negative current collector of a battery is disposed in the housing. Since the positive current collector is insulated from the housing, the electric potential of the housing is lower. The problem of corrosion of the embedded lithium in the housing may thus occur, and battery performance is thereby affected.

<CIT> discloses an electrical energy accumulation device from electromagnetic attacks. The electrical energy accumulation device comprises a housing made of an electrically conductive material, at least one electrical energy storage cell that is arranged in the housing and two terminals that are arranged through the housing, the terminals being electrically insulated from the housing, the terminals allowing electrical energy to be transferred between the at least one storage cell and the exterior of the device. The device further comprises, inside the housing, a specific component exhibiting an impedance having at least one resistive component that is higher than <NUM> ohm.

The disclosure provides a battery and a battery apparatus.

According to the first aspect of the disclosure, the disclosure provides a battery, and the battery includes a housing, a positive current collector, a negative current collector and a resistor assembly. The positive current collector is disposed at the housing. The negative current collector is disposed at the housing. The positive current collector is electrically connected to the housing through the resistor assembly, and the resistor assembly includes a first resistor and a second resistor arranged in parallel. A resistance value of the first resistor is greater than a resistance value of the second resistor. The positive current collector comprises a fusing structure, the second resistor is disposed between the fusing structure and the housing, and the fuse structure is in electrical series with the second resistor. When a current passing through the fusing structure exceeds a threshold value, the fusing structure disconnects an electrical connection between the positive current collector and the second resistor.

According to the second aspect of the disclosure, the disclosure further provides a battery apparatus including the abovementioned battery.

For a better understanding of the disclosure, reference may be made to exemplary embodiments shown in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted, or in some instances proportions may have been exaggerated, so as to emphasize and clearly illustrate the features described herein. In addition, related elements or components can be variously arranged, as known in the art. Further, in the drawings, like reference numerals designate same or like parts throughout the several views.

The technical solutions in the exemplary embodiments of the disclosure will be described clearly and explicitly in conjunction with the drawings in the exemplary embodiments of the disclosure. The description proposed herein is just the exemplary embodiments for the purpose of illustrations only, not intended to limit the scope of the disclosure, so it should be understood that and various modifications and variations could be made thereto without departing from the scope of the disclosure as defined by the claims.

In the description of the present disclosure, unless otherwise specifically defined and limited, the terms "first", "second" and the like are only used for illustrative purposes and are not to be construed as expressing or implying a relative importance. The term "plurality" is two or more.

In particular, a reference to "the" object or "a" and "an" object is intended to denote also one of a possible plurality of such objects. Unless otherwise defined or described, the terms "connect", "fix" should be broadly interpreted, for example, the term "connect" can be "fixedly connect", "detachably connect", "integrally connect", "electrically connect" or "signal connect". The term "connect" also can be "directly connect" or "indirectly connect via a medium". For the persons skilled in the art, the specific meanings of the abovementioned terms in the present disclosure can be understood according to the specific situation.

Further, in the description of the present disclosure, it should be understood that spatially relative terms, such as "above", "below" "inside", "outside" and the like, are described based on orientations illustrated in the figures, but are not intended to limit the exemplary embodiments of the present disclosure.

In the context, it should also be understood that when an element or features is provided "outside" or "inside" of another element(s), it can be directly provided "outside" or "inside" of the other element, or be indirectly provided "outside" or "inside" of the another element(s) by an intermediate element.

An embodiment of the disclosure provides a battery. With reference to <FIG>, the battery includes a housing <NUM>, a positive current collector <NUM>, a negative current collector <NUM> and a resistor assembly <NUM>. The positive current collector <NUM> is disposed at the housing <NUM>. The negative current collector <NUM> is disposed at the housing <NUM>. The positive current collector <NUM> is electrically connected to the housing <NUM> through the resistor assembly <NUM>. The resistor assembly <NUM> includes a first resistor <NUM> and a second resistor <NUM> arranged in parallel. A resistance value of the first resistor <NUM> is greater than a resistance value of the second resistor <NUM>.

In an embodiment of the disclosure, the battery includes the housing <NUM>, the positive current collector <NUM>, the negative current collector <NUM>, and the resistor assembly <NUM>. The positive current collector <NUM> is electrically connected to the housing <NUM> through the resistor assembly <NUM>. The resistor assembly <NUM> includes the first resistor <NUM> and the second resistor <NUM> arranged in parallel, and a resistance value of the first resistor <NUM> is greater than a resistance value of the second resistor <NUM>. As such, a total resistance value of the first resistor <NUM> and the second resistor <NUM> is less than the resistance value of the second resistor <NUM>. In this way, an electric potential of the housing <NUM> may be increased, the housing <NUM> may be prevented from being corroded, and performance of the battery is thereby improved.

It should be noted that, as the resistance values of the first resistor <NUM> and the second resistor <NUM> are configured to be different and the first resistor <NUM> and the second resistor <NUM> are configured to be arranged in parallel; therefore, a resistor with a relatively small resistance value is connected in series between the positive current collector <NUM> and the housing <NUM>. As such, an electric potential between the positive current collector <NUM> and the housing <NUM> is relatively high, and the housing <NUM> is thereby prevented from being corroded.

In an embodiment, the battery includes a cell and an electrolyte, and the battery is the smallest unit capable of performing electrochemical reactions such as charging/discharging. The cell refers to a unit formed by winding or laminating a stacked part, and the stacked part includes a first electrode, a separator and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. The polarities of the first electrode and the second electrode may be interchanged. The cell may be disposed in the housing <NUM>.

The positive current collector <NUM> and the negative current collector <NUM> may include portions of the cell. The positive current collector <NUM> may include a positive tab <NUM>, and the negative current collector <NUM> may include a negative tab <NUM>. The positive current collector <NUM> may further include a positive terminal component <NUM>, and the negative current collector <NUM> may further include a negative terminal component <NUM>. The positive tab <NUM> and the positive terminal component <NUM> are electrically connected, and the negative tab <NUM> and the negative terminal component <NUM> are electrically connected. As such, the cell may perform charging/discharging through the positive terminal component <NUM> and the negative terminal component <NUM>.

In an embodiment, the positive current collector <NUM> and the negative current collector <NUM> are disposed on the housing <NUM>. The positive terminal component <NUM> of the positive current collector <NUM> may be located on the housing <NUM>, and the negative terminal component <NUM> of the negative current collector <NUM> may be located on the housing <NUM>. A part of the positive terminal component <NUM> and a part of the negative terminal component <NUM> may be spaced apart from each other and disposed outside the housing <NUM>.

In some embodiments, the positive current collector <NUM> and the negative current collector <NUM> are disposed in the housing <NUM>. The positive tab <NUM> of the positive current collector <NUM> may be located in the housing <NUM>, and the negative tab <NUM> of the negative current collector <NUM> may be located in the housing <NUM>.

In an embodiment, the resistance value of the first resistor <NUM> is greater than or equal to <NUM> MΩ, and the resistance value of the second resistor ranges from <NUM> S2 to <NUM>,<NUM>Ω. As such, the total resistance value of the first resistor <NUM> and the second resistor <NUM> is less than <NUM>Ω, so it is ensured that the potential between the positive current collector <NUM> and the housing <NUM> is maintained at a relatively high value, that is, it is ensured that the potential of the housing <NUM> is greater than a corrosion potential.

In some embodiments, a voltage between the positive current collector <NUM> and the housing <NUM> is less than or equal to <NUM> mV, that is, the electric potential of the housing <NUM> may be greater than a corrosion potential. The corrosion potential may be less than or equal to 2V.

In an embodiment, the first resistor <NUM> and the second resistor <NUM> of the resistor assembly <NUM> are not resistor devices provided by the related art. The first resistor <NUM> and the second resistor <NUM> may be other structures having specific resistance values. For instance, the first resistor <NUM> may be a structure made of an insulating material, and the insulating material may be rubber, polyphenylene sulfide, etc., such that the resistance value of the first resistor <NUM> is relatively large. The second resistor <NUM> may be a structure made of a semi-conductive material, and the semi-conductive material may be a conductive material made of a conductive fiber doped with polyphenylene sulfide, such that the resistance of the second resistor <NUM> is relatively small.

In an embodiment, the first resistor <NUM> includes one or more of a mica insulating material, ceramic, synthetic resin, insulating glue, a fiber product, rubber, plastic and asbestos, such that the resistance value of the first resistor <NUM> is greater than or equal to <NUM> MΩ.

A material of the first resistor <NUM> may be one of a mica insulating material, ceramic, synthetic resin, insulating glue, a fiber product, rubber, plastic and asbestos. Alternatively, the material of the first resistor <NUM> may be a combination of at least two of a mica insulating material, ceramic, synthetic resin, insulating glue, a fiber product, rubber, plastic and asbestos, so that it is ensured that the first resistor <NUM> has a relatively large resistance value.

In an embodiment, the second resistor <NUM> includes one or more of a carbon film resistor, a metal film resistor, a metal oxide and a semiconductor material, such that the resistance value range of the second resistor is <NUM>Ω to <NUM>,<NUM>Ω. The metal oxide may be a zinc oxide, an aluminum oxide, etc., and the semiconductor material may be doped silicon, gallium arsenide, aluminum gallium arsenide, etc..

A material of the second resistor <NUM> may be one of a carbon film resistor, a metal film resistor, a zinc oxide, doped silicon, gallium arsenide and aluminum gallium arsenide. Alternatively, the material of the second resistor <NUM> may be a combination of at least two of a carbon film resistor, a metal film resistor, a zinc oxide, doped silicon, gallium arsenide and aluminum gallium arsenide, so that it is ensured that the second resistor <NUM> has a relatively small resistance value.

The positive current collector <NUM> includes a fusing structure <NUM>. Herein, when a current passing through the fusing structure <NUM> exceeds a threshold value, the fusing structure <NUM> disconnects the electrical connection between the positive current collector <NUM> and the second resistor <NUM>. As such, it is thereby ensured that when a short circuit is present in the battery, if a current still exists between the positive current collector <NUM> and the housing <NUM>, a larger resistance value may be provided between the positive current collector <NUM> and the housing <NUM>, and a thermal runaway problem may thus be prevented from occurring.

It should be noted that, as shown in <FIG>, the positive current collector <NUM> includes the fusing structure <NUM>, and the first resistor <NUM> and the second resistor <NUM> are arranged between the positive current collector <NUM> and the housing <NUM>. As shown in <FIG>, when the battery is connected into a battery apparatus <NUM>, if there is a short circuit inside the battery, for example, the positive terminal component <NUM> of the positive current collector <NUM> and the negative terminal component <NUM> of the negative current collector <NUM> are directly connected, due to the presence of the battery apparatus <NUM>, the battery apparatus <NUM> may apply a reverse high voltage to the short-circuited battery. At this time, the fusing structure <NUM> is disconnected, and the resistor through which the current flows between the positive current collector <NUM> and the housing <NUM> is the first resistor <NUM>. Since the resistance value of the first resistor <NUM> is larger, the first resistor <NUM> may not be broken down, and the thermal runaway problem may thus be prevented from occurring.

The fusing structure <NUM> disconnects the electrical connection between the positive current collector <NUM> and the second resistor <NUM>, that is, the current between the positive current collector <NUM> and the housing <NUM> may not flow through the second resistor <NUM>. In some embodiments, after the fusing structure <NUM> disconnects the electrical connection between the positive current collector <NUM> and the second resistor <NUM>, the current between the positive current collector <NUM> and the housing <NUM> f only lows through the first resistor <NUM>. Since the resistance value of the first resistor <NUM> is larger, the first resistor <NUM> may not be broken down, and the thermal runaway problem may thus be prevented from occurring. In some embodiments, after the fusing structure <NUM> disconnects the electrical connection between the positive current collector <NUM> and the second resistor <NUM>, the battery apparatus <NUM> may be directly disconnected from the battery, that is, there is no current between the positive current collector <NUM> and the housing <NUM>, and the thermal runaway problem may thus be prevented from occurring.

In an embodiment, as shown in <FIG> and <FIG>, the positive current collector <NUM> further includes the positive terminal component <NUM>, and the housing <NUM> includes a first housing member and a second housing member connected to each other. Herein, the first resistor <NUM> is disposed between the positive terminal component <NUM> and the first housing member, or the first resistor <NUM> is disposed between the positive terminal component <NUM> and the second housing member, so that it is ensured that the positive terminal component <NUM> and the first housing member are connected to each other at least through the first resistor <NUM>. When the battery is in normal use, the first resistor <NUM> and the second resistor <NUM> are connected in parallel, so that the problem of corrosion is prevented from occurring. When an excessive current occurs, the fusing structure <NUM> is disconnected. When a current is provided between the positive current collector <NUM> and the housing <NUM>, the current may only flow through the first resistor <NUM>, so that the thermal runaway problem is prevented through the first resistor <NUM>.

When the housing <NUM> is electrically connected to both the first resistor <NUM> and the second resistor <NUM>, that is, the positive terminal component <NUM> supplies power to both the first resistor <NUM> and the second resistor <NUM>, since the first resistor <NUM> and the second resistor <NUM> are connected in parallel, the total resistance value is smaller, and the problem of corrosion is prevented from occurring. When the positive terminal component <NUM> supplies power to the first resistor <NUM>, since the resistance value of the first resistor <NUM> is larger, the battery is protected, and thermal runaway is prevented from occurring.

In an embodiment, as shown in <FIG>, the positive current collector <NUM> further includes the positive tab <NUM>. The fusing structure <NUM> is connected to the positive tab <NUM> and the positive terminal component <NUM>, and the second resistor <NUM> is disposed between the fusing structure <NUM> and the housing <NUM>. When the current passing through the fusing structure <NUM> exceeds the threshold value, the fusing structure <NUM> disconnects the electrical connection between the positive tab <NUM> and the positive terminal component <NUM> and the electrical connection between the positive tab <NUM> and the second resistor <NUM>. In this way, the first resistor <NUM> may act as an insulator between the positive terminal component <NUM> and the housing <NUM>, and the thermal runaway problem is accordingly prevented from occurring. In this embodiment, both the first resistor <NUM> and the second resistor <NUM> may be disposed between housing <NUM> and the positive terminal component <NUM>.

In an embodiment, the positive tab <NUM> and the positive terminal component <NUM> may be directly connected to each other through the fusing structure <NUM>. The fusing structure <NUM> may be a fuse structure for safety, and the fuse structure may be at least one of a wire and a fuse. A material of the fuse structure may be selected from a conductive material such as conductive metal, a conductive metal oxide, or other conductive inorganic materials. An insulating structure may be wrapped on a surface of the fuse structure, and the insulating structure may protect the fuse structure.

In an embodiment, as shown in <FIG>, the positive current collector <NUM> further includes an adapter piece <NUM>, and the positive tab <NUM> and the positive terminal component <NUM> may be connected to each other through the adapter piece <NUM>. At this time, a connection path between the positive tab <NUM> and the positive terminal component <NUM> may be further provided with the fusing structure <NUM>. The fusing structure <NUM> may be a fuse structure, and the fuse structure may be at least one of a wire and a fuse. Alternatively, the fusing structure <NUM> is disposed on the adapter piece <NUM>. As such, when the fusing structure <NUM> is disconnected, the adapter piece <NUM> is also disconnected, and the electrical connection between the positive tab <NUM> and the positive terminal component <NUM> and the electrical connection between the positive tab <NUM> and the second resistor <NUM> are thereby disconnected.

In some embodiments, the fusing structure <NUM> may be a portion of the adapter piece <NUM>. For instance, a through hole is provided on the adapter piece <NUM>, so an area of the adapter piece <NUM> is decreased, and the fusing structure <NUM> is formed.

In an embodiment, as shown in <FIG>, the positive current collector <NUM> further includes a busbar <NUM>. The positive terminal component <NUM> is electrically connected to the busbar <NUM>, and the fusing structure <NUM> is connected to the busbar <NUM> and the second resistor <NUM>. Herein, the second resistor <NUM> is disposed between the fusing structure <NUM> and the housing <NUM>. When the current passing through the fusing structure <NUM> exceeds the threshold value, the fusing structure <NUM> disconnects the electrical connection between the busbar <NUM> and the second resistor <NUM>, that is, the electrical connection between the positive terminal component <NUM> and the second resistor <NUM> is disconnected. In this way, the first resistor <NUM> may act as an insulator between the positive terminal component <NUM> and the housing <NUM>, and the thermal runaway problem is accordingly prevented from occurring. After the fusing structure <NUM> is disconnected, the current of the battery apparatus <NUM> is transferred to the first resistor <NUM> through the busbar <NUM> and the positive terminal component <NUM>, and thus passes through the housing <NUM>. Due to the presence of the first resistor <NUM>, the electric potential on the housing <NUM> may not be excessively high, and protection is thereby effectively provided. In this embodiment, the first resistor <NUM> may be disposed between the housing <NUM> and the positive terminal component <NUM>, and the second resistor <NUM> may be disposed between the housing <NUM> and the busbar <NUM>.

It should be noted that, when the first resistor <NUM> is located between the positive tab <NUM> and the positive terminal component <NUM>, the resistance value of the first resistor <NUM> is required to be kept below a predetermined value, such that the electrical connection between the positive tab <NUM> and the positive terminal component <NUM> is ensured, so as to accordingly ensure the normal use of the battery.

In an embodiment, the fusing structure <NUM> is disposed on the busbar <NUM>. As such, when the fusing structure <NUM> is disconnected, the busbar <NUM> is disconnected, and the power supply from the battery apparatus <NUM> to the battery is thereby disconnected. The busbar <NUM> is configured to implement the series connection and parallel connection between the batteries. Therefore, after the busbar <NUM> is disconnected, the connection between the batteries may be disconnected, and the problem of reverse high voltage may not occur in a single battery.

In an embodiment, as shown in <FIG> and <FIG>, the housing <NUM> includes the first housing member and the second housing member connected to each other. The positive current collector <NUM> may further include the positive terminal component <NUM> and the busbar <NUM>, and the positive terminal component <NUM> is electrically connected to the busbar <NUM>. Herein, the first resistor <NUM> is disposed between the busbar <NUM> and the first housing member, or the first resistor <NUM> is disposed between the busbar <NUM> and the second housing member. As such, the first resistor <NUM> may be conveniently installed, and it is also ensured that the positive terminal component <NUM> and the first housing member are connected to each other at least through the first resistor <NUM>. When the battery is in normal use, the first resistor <NUM> and the second resistor <NUM> are connected in parallel, so that the problem of corrosion is prevented from occurring. When an excessive current occurs, the fusing structure <NUM> is disconnected. When a current is provided between the positive current collector <NUM> and the housing <NUM>, the current may only flow through the first resistor <NUM>, so that the thermal runaway problem is prevented through the first resistor <NUM>.

In an embodiment, as shown in <FIG>, the positive current collector <NUM> further includes the positive tab <NUM>, and the fusing structure <NUM> is connected to the positive tab <NUM> and the positive terminal component <NUM>. Herein, the second resistor <NUM> is disposed between the fusing structure <NUM> and the housing <NUM>. When the current passing through the fusing structure <NUM> exceeds the threshold value, the fusing structure <NUM> disconnects the electrical connection between the positive tab <NUM> and the positive terminal component <NUM> and the electrical connection between the positive tab <NUM> and the second resistor <NUM>. In this way, the first resistor <NUM> may act as an insulator between the busbar <NUM> and the housing <NUM>, and the thermal runaway problem is accordingly prevented from occurring. After the fusing structure <NUM> is disconnected, the current of the battery apparatus <NUM> is transferred to the first resistor <NUM> through the busbar <NUM>, and thus passes through the housing <NUM>. Due to the presence of the first resistor <NUM>, the electric potential on the housing <NUM> may not be excessively high, and protection is thereby effectively provided. In this embodiment, the first resistor <NUM> is disposed between the housing <NUM> and the busbar <NUM>, and the second resistor <NUM> is disposed between the housing <NUM> and the positive terminal component <NUM>. In some embodiments, the second resistor <NUM> may not be provided to be connected between the positive tab <NUM> and the positive terminal component <NUM>. Alternatively, the second resistor <NUM> may be provided to be connected between the positive tab <NUM> and the positive terminal component <NUM>, as shown in <FIG>.

In an embodiment, the first resistor <NUM> is disposed between the busbar <NUM> and the first housing member. Alternatively, when the first resistor <NUM> is disposed between the busbar <NUM> and the second housing member, the fusing structure <NUM> may be disposed on the busbar <NUM>. As such, when the fusing structure <NUM> is disconnected, the busbar <NUM> is disconnected, and the power supply from the battery apparatus <NUM> to the battery is thereby disconnected.

In an embodiment, as shown in <FIG>, the second resistor <NUM> is disposed between the busbar <NUM> and the first housing member, or the second resistor <NUM> is disposed between the busbar <NUM> and the second housing member, and the fusing structure <NUM> is disposed on the busbar <NUM>. As such, when the fusing structure <NUM> is disconnected, the busbar <NUM> is disconnected, and the power supply from the battery apparatus <NUM> to the battery is thereby disconnected, and the thermal runaway problem is prevented from occurring. In this embodiment, both the first resistor <NUM> and the second resistor <NUM> may be disposed between the housing <NUM> and the busbar <NUM>.

It should be noted that, the busbar <NUM> is located outside the housing <NUM>. Therefore, when the first resistor <NUM> and the second resistor <NUM> are disposed between the housing <NUM> and the busbar <NUM>, the first resistor <NUM> and the second resistor <NUM> are located outside the housing <NUM>. A portion of the positive terminal component <NUM> may be located outside the housing <NUM>. When the first resistor <NUM> and the second resistor <NUM> are disposed between the housing <NUM> and the positive terminal component <NUM>, the first resistor <NUM> and the second resistor <NUM> are located outside the housing <NUM>. A portion of the positive terminal component <NUM> may be located inside the housing <NUM>. When the first resistor <NUM> and the second resistor <NUM> are disposed between the housing <NUM> and the positive terminal component <NUM>, the first resistor <NUM> and the second resistor <NUM> are located inside the housing <NUM>.

In an embodiment, the first housing member and the second housing member are connected to each other to form a sealed space for sealing the cell. The first housing member or the second housing member may be a cover.

It should be noted that, the structure of the negative current collector <NUM> is not particularly limited herein, and description thereof may be found with reference to the description of the positive current collector <NUM>. For instance, the negative current collector <NUM> may include the negative tab <NUM> and the negative terminal component <NUM>, and the negative tab <NUM> and the negative terminal component <NUM> may be directly connected to each other. Alternatively, the negative tab <NUM> may be connected to the negative terminal component <NUM> through an adapter piece. The negative current collector <NUM> may further include a busbar, a fusing structure, or a resistor assembly.

In the battery provided by the embodiments of the disclosure, the first resistor having a large resistance value is connected in series between the positive terminal component and the housing, so the thermal runaway problem caused by the reverse high voltage is prevented. At the same time, the second resistor having a small resistance value is connected between the fusing structure and the housing, and the first resistor and the second resistor are connected in parallel, such that the problem of corrosion is prevented from occurring in the housing.

An embodiment of the disclosure further provides a battery apparatus including the abovementioned battery.

A battery apparatus provided by an embodiment of the disclosure includes the battery, and the battery includes the housing <NUM>, the positive current collector <NUM>, the negative current collector <NUM> and the resistor assembly <NUM>. The positive current collector <NUM> is electrically connected to the housing <NUM> through the resistor assembly <NUM>. The resistor assembly <NUM> includes the first resistor <NUM> and the second resistor <NUM> arranged in parallel, and the resistance value of the first resistor <NUM> is greater than the resistance value of the second resistor <NUM>. As such, the total resistance value of the first resistor <NUM> and the second resistor <NUM> is less than the resistance value of the second resistor <NUM>. In this way, the electric potential of the housing <NUM> may be increased, the housing <NUM> may be prevented from being corroded, and performance of the battery apparatus is thereby improved.

In an embodiment, the battery apparatus includes a plurality of batteries, and the plurality of batteries may be connected in series and/or in parallel. The batteries may be connected in series or parallel via the busbar.

In an embodiment, the battery apparatus may a battery module or a battery pack.

The battery module includes a plurality of batteries, and the plurality of batteries may be secured through end plates and side plates.

The battery pack includes a plurality of batteries and a battery box, and the battery box is configured to secure the plurality of batteries.

It should be noted that, the battery pack includes the battery, the battery may be multiple, and the multiple batteries are arranged in the box. Herein, after forming the battery module, the batteries may be installed in the box. Herein, the battery module may include the end plates and the side plates configured for securing the batteries. Alternatively, the batteries may be directly disposed in the box, that is, the batteries are not required to be arranged into groups, and the end plates and the side plates may be removed at this time.

Claim 1:
A battery, comprising:
a housing (<NUM>);
a positive current collector (<NUM>), disposed at the housing (<NUM>);
a negative current collector (<NUM>), disposed at the housing (<NUM>); and
a resistor assembly (<NUM>), wherein the positive current collector (<NUM>) is electrically connected to the housing (<NUM>) through the resistor assembly (<NUM>), and the resistor assembly (<NUM>) comprises a first resistor (<NUM>) and a second resistor (<NUM>) arranged in parallel,
wherein a resistance value of the first resistor (<NUM>) is greater than a resistance value of the second resistor (<NUM>),
wherein the positive current collector (<NUM>) comprises a fusing structure (<NUM>), the fuse structure (<NUM>) is in electrical series with the second resistor (<NUM>), and the second resistor (<NUM>) is disposed between the fusing structure (<NUM>) and the housing (<NUM>),
wherein when a current passing through the fusing structure (<NUM>) exceeds a threshold value, the fusing structure (<NUM>) disconnects an electrical connection between the positive current collector (<NUM>) and the second resistor (<NUM>).