KR20190106539A - Apparatus for detecting state of secondary battery - Google Patents

Abstract

The present invention relates to an enhanced apparatus for detecting a state of a secondary battery, configured to effectively detect swelling of the secondary battery during a process of detecting the swelling of the secondary battery. According to one embodiment of the present invention, the apparatus for detecting a state of a secondary battery, which is configured to detect a state of a secondary battery, comprises: a measurement cable formed to be extended longitudinally in one direction, having a plurality of resistances disposed at regular intervals, and formed in a shape to surround an outer surface of the secondary battery, wherein at least two resistances of the plurality of resistances have different resistance values; a fixing unit mounted on one end of the measurement cable and configured to allow the other end of the measurement cable to be coupled thereto, wherein the other end of the measurement cable is configured to be moved at a predetermined distance in a longitudinal direction of the measurement cable by a pressure applied in the longitudinal direction of the measurement cable; a measurement terminal mounted in the fixing unit and configured to come into contact with both ends of at least one of the plurality of resistances; and a detection unit connected to the measurement terminal and configured to detect a state of the secondary battery based on electrical signals received from the measurement terminal.

Description

Secondary battery state detection device {Apparatus for detecting state of secondary battery}

The present invention relates to a secondary battery state detection apparatus, and more particularly, to an improved secondary battery state detection apparatus capable of detecting swelling of a secondary battery effectively in the process of detecting swelling of a secondary battery.

Recently, as the demand for portable electronic products such as notebooks, video cameras, portable telephones, etc. is rapidly increased, and development of electric vehicles, energy storage batteries, robots, satellites, and the like is in earnest, high-performance secondary batteries capable of repeatedly charging and discharging are possible. There is an active research on.

Commercially available secondary batteries include nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries have almost no memory effect compared to nickel-based secondary batteries, and thus are free of charge and discharge. The self-discharge rate is very low and the energy density is high.

A typical lithium ion battery cell includes an electrode assembly having a porous positive electrode current collector, a negative electrode current collector, and a separator alternately overlapping each other, and a cell packaging material containing the electrode assembly and the electrolyte. Such battery cells may be classified into can type battery cells or pouch type battery cells, depending on the shape of the cell exterior material.

On the other hand, recently, the biggest social issue with respect to the battery is the safety issue of the battery. In the case of laptops and mobile phones, the population of users is rapidly increasing, and it is urgent to ensure battery safety in that the explosion of the battery not only causes damage to portable electronic products but also leads to fire. Therefore, in the related art, various protection devices are used to secure the safety of the battery by blocking the charge / discharge current when the battery detects an abnormal state.

Such a conventional battery pack protection device is connected to a cell assembly consisting of at least one battery cell, and in general, a line through which charge and discharge current flows to protect the battery pack when an abnormal condition such as overcharge, overdischarge, short circuit, or overcurrent occurs. It includes a fuse for irreversibly disconnecting the current to block the flow of current and a sense resistor for sensing the magnitude of the charge / discharge current.

However, such a conventional battery pack protection device may not properly detect when a swelling phenomenon of a battery cell occurs. Here, the swelling phenomenon of the cell refers to a phenomenon in which the pressure inside the cell increases rapidly and the can swells. Such swelling may occur mainly due to gas generation inside the cell, such as when gas is generated due to heat generation or ignition of the lithium ion battery cell electrode, or when gas is generated due to decomposition of the electrolyte by overvoltage. That is, in the case of the conventional battery pack protection device, such structural deformation of the battery cell could not be properly detected.

In addition, the battery module often includes a plurality of secondary batteries. In particular, in the case of a medium-large battery module used in an automobile or an energy storage device (ESS), a large number of secondary batteries may be included and interconnected for high output to high capacity. For this reason, a battery pack protection device capable of efficiently utilizing the internal space of the battery module is required. The conventional battery pack protection device has a problem in terms of space utilization because a bulky fuse must be installed inside the battery module.

The present invention has been made under the background of the prior art, and relates to an improved secondary battery state detection apparatus capable of detecting swelling of a secondary battery effectively in the process of detecting swelling of a secondary battery.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized by the means and combinations thereof indicated in the claims.

The secondary battery state detection device according to an embodiment of the present invention for achieving the above object, as a device for detecting the state of the secondary battery, is formed to extend in one direction long, at a predetermined interval in the longitudinal direction A measurement cable having a plurality of resistors, at least two or more of the plurality of resistors having different resistance values and configured to surround the outer surface of the secondary battery; Is mounted on one end of the measuring cable and configured so that the other end of the measuring cable can be coupled, the other end of the measuring cable by the pressure applied in the longitudinal direction of the measuring cable by a predetermined interval in the longitudinal direction of the measuring cable A fixed unit configured to be movable; A measurement terminal mounted inside the fixed unit and configured to be in contact with both ends of one of the plurality of resistors; And a detection unit connected to the measurement terminal and configured to detect a state of a secondary battery based on an electrical signal received from the measurement terminal.

In addition, the plurality of resistors may be configured such that the resistance value sequentially decreases or increases as the distance from the fixed unit increases.

In addition, the measuring cable is provided with two linear members parallel to each other and extending in the longitudinal direction of the measuring cable and both ends are connected to each other, the resistance is configured in the form that both ends are connected to the two linear members. Can be.

In addition, the measuring cable may include a plurality of grooves configured to fix the fixing unit.

In addition, the fixing unit may be formed in the hollow in the same direction as the longitudinal direction of the measuring cable, so that the other end of the measuring cable can be inserted into the hollow.

The fixing unit may include a fixing member provided on the hollow surface and configured to protrude upward and downward to fit into a groove provided in the measuring cable.

In addition, the measuring terminal may be provided on the surface of the hollow and protrude in the vertical direction.

The measuring terminal may be configured to contact both ends of the resistor when the fixing member is fitted into the groove.

In addition, the detection unit may be configured to detect swelling of the secondary battery based on the change in the resistance value.

In addition, the detection unit may be configured to detect swelling of the secondary battery based on the moving distance of the fixed unit.

In addition, the battery pack according to an embodiment of the present invention for achieving the above object includes a secondary battery state detection apparatus according to the present invention.

According to the present invention, structural deformation of the secondary battery can be detected. And, based on this, the swelling phenomenon of the secondary battery can be detected. Therefore, the secondary battery state detection apparatus according to the present invention has an effect of simplifying the configuration and increasing the space utilization as compared with the case of installing a separate fuse.

In addition to the present invention may have a variety of other effects, these other effects of the present invention can be understood by the following description, it will be more clearly understood by the embodiments of the present invention.

The following drawings attached to this specification are illustrative of preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention described in such drawings It should not be construed as limited to.
1 is a diagram schematically illustrating a configuration in which a secondary battery state detection apparatus according to an embodiment of the present invention is mounted on a secondary battery.
2 is a plan view schematically illustrating a part of a configuration of a secondary battery state detection device according to an embodiment of the present invention.
3 is a front view of a fixing unit according to an embodiment of the present invention.
4 is a cross-sectional view schematically showing a coupling configuration of a fixing unit and a measuring cable according to an embodiment of the present invention.
5 is a plan view schematically showing the configuration of a fixing unit mounted to a measuring cable according to an embodiment of the present invention.
6 is a cross-sectional view schematically showing some components of a measuring cable according to an embodiment of the present invention.
7 is a table illustrating a change in thickness of a secondary battery according to a resistance value referred to by a detection unit and a moving distance of a fixed unit, according to an exemplary embodiment.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Throughout the specification, when a part is said to "include" a certain component, it means that it may further include other components, without excluding the other components unless otherwise stated.

In addition, throughout the specification, when a part is "connected" to another part, it is not only "directly connected" but also "indirectly connected" with another element in between. Include.

In the present specification, a battery cell means a single independent cell having a negative terminal and a positive terminal and physically detachable. For example, one pouch-type lithium polymer cell may be regarded as a battery cell. Hereinafter, for convenience of description, the battery cell will be referred to as a "secondary battery".

The secondary battery state detection device according to an embodiment of the present invention is a device for detecting a state of a secondary battery. For example, the secondary battery state detection device can detect whether or not the secondary battery is overcharged. More specifically, the secondary battery state detection device may detect swelling in which the secondary battery is expanded by overcharging. In addition, the secondary battery state detection device can detect swelling in which the secondary battery is expanded due to long use of the secondary battery.

1 is a view schematically showing a configuration in which a secondary battery state detection device according to an embodiment of the present invention is mounted on a secondary battery, and FIG. 2 is a part of a secondary battery state detection device according to an embodiment of the present invention. It is a top view which shows a structure schematically.

1 and 2, a secondary battery state detecting apparatus according to an embodiment of the present invention includes a measuring cable 100, a fixing unit 200, a measuring terminal 210, and a detecting unit 300. .

The measuring cable 100 may be formed to extend in one direction. For example, as shown in the configuration of FIGS. 1 and 2, the measurement cable 100 is elongated in one direction (y-axis direction of FIG. 2) and may be made of an insulating material.

In addition, the measurement cable 100 may be provided with a plurality of resistors 110 at predetermined intervals in the longitudinal direction. For example, as shown in the configuration of FIG. 2, the plurality of resistors 110 are connected to the measurement cable 100 at a predetermined distance from the fixing unit 200 in the longitudinal direction (y-axis direction in FIG. 2). Can be mounted. More specifically, the plurality of resistors 110 may be mounted to the measurement cable 100 in a direction perpendicular to the longitudinal direction of the measurement cable 100 (the z-axis direction of FIG. 2). In particular, at least two or more resistors 110 of the plurality of resistors 110 included in the measurement cable 100 may have different values of the resistors 110.

In addition, the measurement cable 100 may be configured to surround the outer surface of the secondary battery 10. For example, as shown in the configuration of Figure 1, the measurement cable 100, one end of the measurement cable 100 and the other end of the measurement cable 100 is coupled to surround the outer surface of the secondary battery 10 Can be. More specifically, the measurement cable 100 may be mounted on the secondary battery 10 in a state in which the outer surface of the secondary battery 10 is wrapped. For example, the measuring cable 100 may be made of a flexible material to bend the body.

Preferably, the plurality of resistors 110 may be provided such that the resistance values are sequentially reduced as the distance from the fixed unit 200. Alternatively, the plurality of resistors 110 may be provided such that resistance values increase in sequence as the distance from the fixed unit 200 increases. Through such a configuration, the secondary battery state detection apparatus according to an embodiment of the present invention can effectively detect the swelling of the secondary battery based on the resistance value of the resistance sequentially changed.

Preferably, the measuring cable 100 may be provided with two straight members parallel to each other and extending in the longitudinal direction of the measuring cable 100 and configured at both ends connected to each other. For example, as shown in the configuration of FIG. 2, the measurement cable 100 may include a first straight member located in the + z axis direction and a second straight member located in the −z axis direction with reference to FIG. 2. Can be. Here, the first straight member and the second straight member extend in the longitudinal direction (y-axis direction based on FIG. 2) of the measurement cable, and may be parallel to each other. Further, the first linear member and the second linear member are mutually at one end of the measuring cable 100 (one end in the -y axis direction in FIG. 2) and the other end of the measuring cable 100 (the other end in the + y axis direction in FIG. 2). Can be connected. Through such a configuration of the present invention, the measurement cable 100 according to the present invention may be formed in a strip-shaped structure surrounding the outer surface of the secondary battery 10.

Further, preferably, the measuring cable 100 may be provided with a supporting member configured to be connected between two straight members in a direction perpendicular to the longitudinal direction of the measuring cable 100. For example, as shown in the configuration of FIG. 2, the measurement cable 100 may include a plurality of support members configured to connect between the first straight member and the second straight member.

Through this configuration of the present invention, the measuring cable 100 according to the present invention, it is possible to ensure that the fixed unit 200 can be fastened to each support member.

More preferably, the resistor 110 may be configured in a form in which both ends are connected to the two linear members. More specifically, the resistor 110 may have one end connected to the first linear member and the other end connected to the second linear member.

Also, preferably, the resistor 110 may be mounted to the support member. More specifically, the resistor 110 may be mounted on one surface of the support member. For example, as shown in the configuration of FIG. 2, the plurality of resistors 110 may be mounted on one surface of the support member, respectively. More specifically, the plurality of resistors 110 may be mounted on one surface of the support member in a direction perpendicular to the measurement cable 100.

The fixed unit 200 may be mounted at one end of the measurement cable 100. For example, as shown in the configuration of FIGS. 1 and 2, the fixing unit 200 may be provided at one end in the longitudinal direction of the measuring cable 100.

In addition, the fixing unit 200 may be configured such that the other end of the measuring cable 100 can be coupled. More specifically, the fixing unit 200 may be mounted on one end of the measuring cable 100, and the other end of the measuring cable 100 may be fastened to the fixing unit 200. Here, the measuring cable 100 is made of a flexible material may be bent by the bending of the outer surface of the secondary battery (10). For example, as shown in the configuration of FIG. 1, the fixed unit 200 is mounted at one end of the measurement cable 100, and the other end of the measurement cable 100 wrapped around the secondary battery 10 once. It may be fastened to the fixed unit 200.

In addition, the fixing unit 200 may be configured to move the other end of the measuring cable 100 by a predetermined interval in the longitudinal direction of the measuring cable 100 by the pressure acting in the longitudinal direction of the measuring cable 100. have. More specifically, when the measurement cable 100 and the fixed unit 200 are mounted on the outer surface of the secondary battery 10, and the secondary battery 10 is expanded by the swelling phenomenon of the secondary battery 10, the measurement cable Pressure may be applied to 100 in the longitudinal direction. In this case, the other end of the measuring cable 100 fastened by the fixing unit 200 may move in the direction of the fixing unit 200 by a predetermined interval.

Preferably, the measuring cable 100 may include a plurality of grooves 120 configured to fix the fixing unit 200. More specifically, the measurement cable 100 may include a plurality of grooves 120 provided at predetermined intervals so that the fixing unit 200 may be fastened to the measurement cable 100. For example, as shown in the configuration of FIGS. 1 and 2, the measurement cable 100 may include a plurality of grooves 120 provided at predetermined intervals in the longitudinal direction of the measurement cable 100. have. Here, the groove 120 may be a hollow in which the inner space is bored. For example, the shape of the groove 120 may be a rectangular shape.

The measurement terminal 210 may be mounted inside the fixed unit 200. In addition, the measurement terminal 210 may be configured to be in contact with both ends of any one of the plurality of resistors 110. For example, the measurement terminal 210 may be configured as two measurement terminals 210 to be in contact with both ends of the resistor 110.

The detection unit 300 may be connected to the measurement terminal 210 and configured to detect a state of the secondary battery 10 based on an electrical signal received from the measurement terminal 210. For example, the detection unit 300 may calculate a resistance value of the resistor 110 in contact with the measurement terminal 210 based on the electrical signal received from the measurement terminal 210. And the detection unit 300 can detect the state of the secondary battery 10 based on a resistance value. For example, the detection unit 300 can detect swelling of the secondary battery 10.

3 is a front view of a fixing unit according to an embodiment of the present invention, Figure 4 is a cross-sectional view schematically showing a coupling configuration of the fixing unit and the measurement cable according to an embodiment of the present invention. 5 is a plan view schematically showing the configuration of a fixing unit attached to a measuring cable according to an embodiment of the present invention.

2 and 3, the fixing unit 200 according to the exemplary embodiment of the present invention may have a hollow formed therein in the same direction as the length direction of the measuring cable 100. More specifically, the fixing unit 200, the hollow is formed in the longitudinal direction of the measuring cable 100, it may be formed in a band-like structure. For example, as shown in the configuration of FIG. 3, the fixing unit 200 may have a hollow formed therein and may have a rectangular band shape. In addition, the fixing unit 200 may be formed so that the other end of the measuring cable 100 can be inserted into the hollow. More specifically, the size and shape of the hollow may be formed to correspond to the size and shape of the measuring cable 100 so that the other end of the measuring cable 100 can be inserted into the hollow.

Preferably, the fixing unit 200 may include a fixing member 220. The fixing member 220 may be provided on a hollow surface. In addition, the fixing member 220 may be configured to protrude in the vertical direction. For example, as shown in the configuration of Figures 3 and 4, the fixing member 220 may be provided on the hollow top surface. In addition, the fixing member 220 may be configured to protrude upward and downward from the top surface of the hollow toward the bottom of the hollow.

3 and 4, the fixing member 220 may be configured to be fitted into the groove 120 provided in the measuring cable 100. For example, as illustrated in the configuration of FIGS. 3 and 4, the fixing member 220 may protrude in a square shape and be fastened to the groove 120 provided in the measuring cable 100.

Preferably, when the fixing member 220 is fastened to the groove 120, the fixing member 220 may be formed to have different shapes of cross sections contacting the supporting member of the measuring cable 100. For example, a cross section formed on the front portion (-y axis direction in FIG. 4) of the fixing member 220 in the longitudinal direction of the measuring cable 100 may have a flat cross section configured to be perpendicular to the measuring cable 100. have. In addition, the cross-section formed on the rear surface portion (+ y-axis direction of FIG. 4) of the fixing member 220 in the longitudinal direction of the measuring cable 100, the inclined cross section may be formed.

Through such a configuration, the fixing member 220 according to the present invention may be easily fastened to the groove provided in the measuring cable 100, and may be fixed to the measuring cable 100 after the fastening.

In addition, the measurement terminal 210 may be provided on the surface of the hollow and protrude in the vertical direction. Also, preferably, the measurement terminal 210 may be configured to contact both ends of the resistor 110 when the fixing member 220 is fitted into the groove 120. For example, referring to FIGS. 3 to 5, the measurement terminal 210 may be configured to protrude in the -x axis direction of FIG. 3 from the hollow surface. In particular, the measurement terminal 210 may protrude shorter than the protruding length of the fixing member 220. In addition, the measurement terminal 210 may be in contact with the resistor 110 provided in the measurement cable 100. For example, as shown in the configuration of FIG. 4, the measurement terminal 210 may contact the resistor 110 while the fixing member 220 is fastened to the measurement cable 100. In particular, the measurement terminal 210 may contact both ends of the resistor 110.

Referring to FIG. 5, the fixing unit 200 is fixed so that the measuring terminal 210 may contact the resistor 110 while the fixing member 220 is fastened to the groove 120 of the measuring cable 100. The distance between the member 220 and the measurement terminal 210 may be separated by a predetermined interval in the longitudinal direction of the measurement cable 100. For example, as shown in the configuration of FIG. 5, the fixing member 220 and the measuring terminal 210 are configured to be spaced apart by a predetermined interval in the longitudinal direction (y-axis direction of FIG. 5) of the measuring cable 100. Can be.

Through such a configuration, the measurement terminal 210 according to the present invention accurately measures the resistance value of the resistor 110 mounted at a predetermined interval when the fixing member 220 is moved and fastened to another groove 120. It can be measured.

6 is a cross-sectional view schematically showing some components of a measuring cable according to an embodiment of the present invention.

Referring to FIG. 6, the plurality of resistors 110 included in the measurement cable 100 according to an exemplary embodiment may have different resistance values. For example, as illustrated in the configuration of FIG. 6, the first unit resistor R1, the second unit resistor R2, and the third unit resistor R3 may have different resistance values. More specifically, the first unit resistor R1, the second unit resistor R2, and the third unit resistor R3 may have different resistance values so that the resistance values decrease in sequence. Alternatively, the first unit resistor R1, the second unit resistor R2, and the third unit resistor R3 may have different resistance values so as to sequentially increase the resistance value.

For example, referring to FIGS. 4 and 6, the resistance value of the first unit resistor R1 is 1 kΩ, the resistance value of the second unit resistor R2 is 10 kΩ, and the resistance of the third unit resistor R3 is shown. The value may be 1MΩ. In this case, when the fixing member 220 is fastened to the first groove h1, the measuring terminal 210 may contact the first unit resistor R1 and measure a resistance value of 1 kΩ. Similarly, when the fixing member 220 is fastened to the second groove h2, the measuring terminal 210 may contact the second unit resistor R2 and measure a resistance value of 10 kΩ. Similarly, when the fixing member 220 is fastened to the third groove h3, the measuring terminal 210 may contact the third unit resistor R3 to measure a resistance value of 1 MΩ.

Through such a configuration, the secondary battery state detection apparatus according to an embodiment of the present invention can easily detect the swelling of the secondary battery according to the change in the resistance value.

7 is a table illustrating a change in thickness of a secondary battery according to a resistance value referred to by a detection unit and a moving distance of a fixed unit, according to an exemplary embodiment.

Referring to the reference table illustrated in FIG. 7, the detection unit 300 may be configured to detect swelling of the secondary battery 10 based on the change in the resistance value. In addition, the detection unit 300 may be configured to detect swelling of the secondary battery 10 based on the moving distance of the fixed unit 200. More specifically, the detection unit 300 stores the thickness of the secondary battery 10 corresponding to the resistance value in advance, and changes the thickness of the secondary battery 10 based on the resistance value measured from the measurement terminal 210. You can judge. For example, in the embodiment of FIG. 7, when the resistance value is changed from the previous detection resistance value of 1 kΩ to the current detection resistance value of 10 kΩ, the detection unit 300 has a thickness of Level 1 ( It can be detected that the thickness increased from 710 to Level 2 720. Here, the thickness level 2 of the secondary battery may be a larger value than the thickness level 1 of the secondary battery. In addition, the detection unit 300 is based on the detection of a movement distance of 1.5 cm between the position of the previous fixed unit (for example, 0 cm) from the position of the current fixed unit (for example, 1.5 cm in FIG. 7). It can be detected that the thickness of the secondary battery has increased to the thickness of Level 3 (730).

Through such a configuration, the detection unit 300 can detect the swelling of the secondary battery using a change in the resistance value detected from the plurality of resistors provided in the measurement cable.

For example, the detection unit 300 may include processors, application-specific integrated circuits (ASICs), other chipsets, logic circuits, registers, communication modems, and / or data known in the art to perform the operations described above. It may be implemented in a form that optionally includes a processing device.

Preferably, the detection unit 300 may include at least one memory unit. That is, at least one memory unit may be built in the detector. In the memory unit, programs and data related to various operations performed by the coolant secondary battery state detection apparatus may be stored in advance. For example, the reference table illustrated in FIG. 7 may be stored in advance in the memory unit.

The secondary battery state detection apparatus according to the present invention may be provided in the battery pack itself. That is, the battery pack according to the present invention may include the above-described secondary battery state detection device according to the present invention. Here, the battery pack may include a plurality of secondary batteries, the secondary battery state detection device, electrical equipment (BMS, relay, fuse, etc.), a case, and the like.

Preferably, in one embodiment of the present invention, the detection unit 300 may include a control unit. In addition, when the control logic is implemented in software, the control unit may be implemented as a set of program modules. In this case, the program module may be stored in the memory device and executed by the processor.

In addition, various control logics of the control unit may be combined with at least one, and the combined control logics are not particularly limited as long as the combined control logics are written in a computer readable code system and accessible to the computer readable. In one example, the recording medium includes at least one selected from the group consisting of a ROM, a RAM, a register, a CD-ROM, a magnetic tape, a hard disk, a floppy disk, and an optical data recording device. In addition, the code system may be distributed and stored and executed in a networked computer. In addition, functional programs, code, and segments for implementing the combined control logics can be easily inferred by programmers in the art to which the present invention pertains.

Meanwhile, in the present specification, terms indicating directions such as up, down, left, right, before and after are used, but these terms are merely for convenience of description and may vary depending on the location of an object or an observer's location. It will be apparent to those skilled in the art that the present invention can be made.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

On the other hand, in the present specification, the term 'unit' is used, such as 'memory unit' and 'control unit', but this refers to a logical structural unit, and means a component that must be physically separated or physically separated. It will be apparent to those skilled in the art that no.

10: secondary battery
100: measuring cable
110: resistance
120: home
200: fixed unit
210: measuring terminal
220: fixed member
300: detection unit

Claims (11)

An apparatus for detecting a state of a secondary battery,
It is formed to extend in one direction, a plurality of resistors are provided at predetermined intervals in the longitudinal direction, at least two or more of the plurality of resistors may have a different resistance value and surround the outer surface of the secondary battery Measuring cable configured in the form;
Is mounted on one end of the measuring cable and configured so that the other end of the measuring cable can be coupled, the other end of the measuring cable by the pressure acting in the longitudinal direction of the measuring cable by a predetermined interval in the longitudinal direction of the measuring cable A fixed unit configured to be movable;
A measurement terminal mounted inside the fixed unit and configured to be in contact with both ends of one of the plurality of resistors; And
A detection unit connected to the measurement terminal and configured to detect a state of a secondary battery based on an electrical signal received from the measurement terminal
Secondary battery state detection apparatus comprising a.
The method of claim 1,
The plurality of resistors, the secondary battery state detection apparatus, characterized in that the resistance value is configured to gradually decrease or increase as the distance from the fixed unit.
The method of claim 1,
The measuring cable has two straight members parallel to each other and extending in the longitudinal direction of the measuring cable and connected at both ends thereof,
The resistance is a secondary battery state detection device, characterized in that the two ends are configured in a form connected to both linear members.
The method of claim 1,
And the measuring cable has a plurality of grooves configured to fix the fixing unit.
The method of claim 4, wherein
The fixing unit is a secondary battery state detection apparatus, characterized in that the hollow is formed in the same direction as the longitudinal direction of the measuring cable, so that the other end of the measuring cable can be inserted into the hollow.
The method of claim 5,
The fixing unit is provided on the surface of the hollow, is configured to protrude in the vertical direction is configured to fit in the groove provided in the measuring cable
Secondary battery state detection apparatus comprising a.
The method of claim 5,
The measuring terminal is provided on the hollow surface and is configured to protrude in the vertical direction, characterized in that the secondary battery state detection device.
The method of claim 6,
And the measuring terminal is configured to contact both ends of the resistance when the fixing member is fitted into the groove.
The method of claim 1,
And the detection unit is configured to detect swelling of the secondary battery based on a change in the resistance value.
The method of claim 1,
And the detection unit is configured to detect swelling of the secondary battery based on the moving distance of the fixed unit.
A battery pack comprising the secondary battery state detection device according to any one of claims 1 to 10.

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