JP2012146447A - Battery abnormality detection system and battery abnormality detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery abnormality detection system and a battery abnormality detection method capable of detecting deflection of a battery caused by vibrations.SOLUTION: Batteries 10 are each provided with end acceleration sensors a and c, which serve as detection means for detecting the deflection of each battery 10, in the vicinity of both ends of a laminate film. Further, a center acceleration sensor b is arranged in the vicinity of the center between the both ends of the laminate film. Acceleration information obtained by the acceleration sensors a, b, and c is fetched into a CPU 20 in each time step so that the deflection of each battery 10 is calculated based on a difference in acceleration between the center acceleration sensor b and the end acceleration sensors a and c. If a calculated deflection amount of the battery 10 is greater than a predetermined deflection amount, a lamp 30 is turned on. Furthermore, if a relationship between the acceleration difference and the deflection at the center of the battery 10 is grasped in advance, it is also possible to determine, based on the acceleration difference, whether or not the deflection of the battery 10 has reached the predetermined amount, without calculating the deflection.

Description

  The present invention relates to a battery-equipped device on which a battery in which a power generation element is covered with an exterior film and sealed.

  A battery (so-called laminate cell) in which a power generation element is sealed with an exterior film is used as a battery assembly (assembled battery) in which a plurality of batteries are assembled in order to ensure a desired output. This battery is excellent in heat dissipation because it is thin and has a large surface area. In addition, since the battery assembly is compact, for example, as a battery stack assembly (assembled battery) in which a plurality of batteries are stacked in multiple stages and electrode tabs of adjacent batteries in the stacking direction are stacked and connected, It is being adopted as a secondary battery for hybrid electric vehicles.

  Since secondary batteries for electric vehicles and hybrid electric vehicles require a high-output and high-capacity battery stack assembly, the batteries tend to become larger in the future. Since the heat generation of the battery becomes more severe as the battery becomes larger (larger output and larger capacity), for example, there is a battery-equipped device that can cool the battery stack assembly as disclosed in Patent Document 1, for example. Necessary.

  As shown in FIG. 6, a battery stack assembly in which a plurality of batteries 60 are stacked in the vertical direction is mounted on the battery mounting device 50 described in Patent Document 1. In the battery 60, a flat laminated electrode 61 as a power generation element is arranged at the center of a pair of laminated films 62 and 63 as an exterior film, and covers both sides of the laminated electrode 61 by the laminated films 62 and 63. The peripheral portions of the laminate films 62 and 63 are joined by heat welding, and the electrolyte solution is sealed together with the laminated electrode 61 between the laminate films 62 and 63.

  The laminated electrode 61 is formed by sequentially laminating a plurality of positive electrode plates and negative electrode plates with separators interposed therebetween, and each positive electrode plate is connected to a positive electrode tab (electrode tab) 64 via a positive electrode lead. The negative electrode plate is connected to a negative electrode tab (electrode tab) 65 through a negative electrode lead, and the positive electrode tab 64 and the negative electrode tab 65 are drawn out from the peripheral portions of the laminate films 62 and 63 and exposed.

  Each battery 60 is supported and laminated at both ends in the longitudinal direction of the laminate films 62 and 63 in a state in which a gap S is secured in the vertical direction. By blowing cooling air through the gap S, each battery 60 is efficiently cooled.

  Since the battery 60 described above is supported and laminated at both ends in the longitudinal direction of the laminate films 62 and 63 in a state where the gap S is secured in the vertical direction, the low output of the laminate film is short in the longitudinal direction. There is a problem that the battery 60 is more likely to bend due to vibration applied to the battery 60 than a low-capacity battery or batteries that are in close contact with each other in the vertical direction.

  Although the laminated electrode 61 of the battery 60 has a certain degree of flexibility, when excessive deflection occurs in the battery 60, the laminated electrode 61 is short-circuited or the battery is thermally runaway due to local heat generation. The danger of doing is assumed. However, the battery-equipped device 50 described in Patent Document 1 is not provided with a means for detecting an abnormality caused by the deflection of the battery 60 or the like.

Therefore, as disclosed in Patent Document 2, it has been proposed to provide an acceleration sensor in a battery body or a battery-utilizing device, and to predict and diagnose an abnormality of the device by processing a signal of the acceleration sensor.
However, in Patent Document 2, the acceleration sensor only senses a mechanical impact such as a drop or collision of a battery-utilizing device, and cannot detect the deflection of the battery itself.

JP 2006-79987 A Japanese Patent Laid-Open No. 11-40205

  The present invention has been made in view of the above circumstances, and in a battery-mounted device including a battery in which a power generation element is covered with an exterior film and hermetically sealed, the deflection of the battery generated by vibration applied to the battery-mounted device is detected. It is an object of the present invention to provide a battery abnormality detection system and a battery abnormality detection method that can be used.

  Hereinafter, each means suitable for solving the above-described problems will be described with additional effects and the like as necessary.

  (1) The battery abnormality detection system of the present invention covers a power generation element so as to be sandwiched between a pair of exterior films, and seals the power generation element between the exterior films by joining the peripheral portions of the exterior films, A battery that detects an abnormality of a battery in which electrode tabs for transmitting and receiving a current from a power generation element are pulled out from the sealed portion of the exterior film and both ends of the exterior film are supported by a restraint provided in a battery-mounted device The abnormality detection system includes a detecting unit that detects a deflection of the battery generated by vibration applied to the battery-equipped device.

  According to such a configuration, it is possible to detect the deflection of the battery generated by the vibration applied to the battery-mounted device using the detection means. Therefore, by utilizing this detection result, when excessive deflection occurs in the battery, the circuit connected to the battery can be shut off, or the operation of the apparatus using the battery as a power supply source can be stopped.

  (2) In the battery abnormality detection system of the present invention described in (1), preferably, the detection means is an end acceleration sensor installed in the vicinity of at least one end of the both ends of the exterior film. And a deflection of the battery reaches a predetermined amount based on the acceleration difference between the center acceleration sensor installed near the center between the both ends of the exterior film and the edge acceleration sensor and the center acceleration sensor. And determining means for determining that it has been performed.

  Deflection is the amount of displacement in the direction perpendicular to the axis of the member before receiving a load when the rod-shaped member is bent by the action of an external force or the like. When the rod-shaped members supported at both ends have bending rigidity and weight that are axisymmetric with respect to the central axis in the length direction, statically, the largest deflection occurs at the center of the member due to the weight. In addition, dynamically, when acceleration acts on both ends of the member from the direction of deflection, an inertial force acts on the member in the direction opposite to the acceleration, and the largest deflection occurs at the center of the member.

  The battery in which the deflection is detected by the battery abnormality detection system of the present invention is supported at both ends of the battery by the restraint, and the bending rigidity between both ends is substantially uniform in the longitudinal direction of the battery. Therefore, similarly to the rod-shaped member described above, when acceleration is applied to both ends of the battery from the deflection direction due to vibration applied to the battery-mounted device, the largest deflection occurs near the center of the battery.

  According to the configuration of the present invention, the end acceleration sensor is installed near the end of the exterior film where no deflection occurs, and the center acceleration sensor is installed near the center between both ends of the exterior film where the largest deflection is considered to occur. It is installed. Then, it is determined that the deflection of the battery has reached a predetermined amount based on the acceleration difference between the end acceleration sensor and the center acceleration sensor. For example, the predetermined amount may be set to the maximum amount of deflection that is expected not to cause a problem in the battery. The reason why it is possible to determine that the deflection has reached the predetermined amount by the configuration of the present invention is as follows.

  Considering the usage environment of the battery-equipped device, it is considered that the deflection of the battery is maximized when a shocking vibration (vibration such as a collision that causes momentary acceleration) is applied to the battery-equipped device. When shock vibration is applied to the battery-equipped device, first, acceleration is applied to both ends of the battery outer film and both ends of the outer film begin to be displaced. On the other hand, an inertial force acts on the central portion of the exterior film in the direction opposite to the acceleration to inhibit the displacement of the central portion of the exterior film. Immediately after this shocking vibration is applied, the acceleration difference between the end acceleration sensor and the center acceleration sensor is maximized, and the deflection of the exterior film center is often maximized.

  Therefore, when shock vibration acts on the battery-equipped device, when the acceleration difference between the end acceleration sensor and the center acceleration sensor is maximized, the deflection of the exterior film center portion is also maximized. Can be estimated. Therefore, if the relationship between this acceleration difference and the deflection of the central part of the exterior film is grasped by experiments and analysis, it is possible to determine whether or not the deflection of the battery has reached a predetermined amount based on the acceleration difference. Become.

  (3) In the battery abnormality detection system of the present invention described in (2), preferably, the determination unit integrates the acceleration difference between the end acceleration sensor and the center acceleration sensor twice in time. And a calculating means for calculating the deflection of the battery.

  If the acceleration is integrated once in time, the speed is obtained, and if the acceleration is integrated twice, the displacement is obtained. Therefore, when the acceleration detected by the edge acceleration sensor is integrated twice in time, the displacement of the outer film edge can be obtained. Further, when the acceleration detected by the central acceleration sensor is integrated twice with time, the displacement of the central portion of the exterior film is obtained. The difference between the displacement at the central portion of the exterior film and the average displacement at both ends of the exterior film (displacement at the center of the line connecting both ends of the exterior film) is the deflection of the central portion of the exterior film. That is, the deflection of the central part of the exterior film can be obtained by integrating the acceleration difference between the end part acceleration sensor and the central part acceleration sensor twice in time.

  According to the calculation means of the present invention, since the deflection of the battery is calculated by integrating the acceleration difference between the end acceleration sensor and the center acceleration sensor twice with respect to time, vibrations of various waveforms acting on the battery-equipped device are detected. On the other hand, the amount of deflection of the battery can be accurately grasped at any time.

  (4) In the battery abnormality detection system of the present invention described in the above (1), preferably, the detection means is installed near one end of the both ends of the exterior film and parallel to the surface direction of the exterior film. A laser oscillator that oscillates a laser; a laser receiver that is installed near the other end of the outer film and receives the laser; and a deflection portion of the battery when the deflection occurs in the battery. And determining means for determining that the deflection of the battery has reached a predetermined amount by detecting that the laser has been blocked by the laser receiver.

  According to such a configuration, when a deflection occurs in the battery, the laser receiver detects that the laser is blocked by the deflection portion of the battery, and determines that the deflection of the battery has reached a predetermined amount. That is, by setting the distance between the laser and the surface of the exterior film equal to the predetermined amount, it is possible to accurately determine whether or not the deflection of the battery has reached the predetermined amount.

  (5) In the battery abnormality detection system of the present invention described in the above (1), preferably, the detection means is arranged in parallel to the surface direction of the exterior film at a certain interval in the deflection direction of the battery. And a conducting portion for energizing the conducting wire, and detecting that the conducting wire is cut off at the bending portion of the battery and the electricity is cut off when the battery is deflected. Determining means for determining that the deflection of the battery has reached a predetermined amount.

  According to such a configuration, when the deflection occurs in the battery, it is determined that the deflection of the battery has reached a predetermined amount by detecting that the conducting wire is cut at the deflection portion of the battery and the electricity is cut off. That is, by setting the distance between the conductive wire and the surface of the exterior film equal to the predetermined amount, it is possible to accurately determine whether or not the deflection of the battery has reached the predetermined amount.

  (6) In the battery abnormality detection system of the present invention, it is preferable that when the determination unit determines that the deflection of the battery has reached a predetermined amount by the determination unit, the determination result is transmitted to the user of the battery-equipped device. It is characterized by comprising a transmission means for transmitting to

  According to such a configuration, the user of the battery-equipped device can grasp whether or not the deflection of the battery has reached a predetermined amount by the transmission means. As this transmission means, for example, various transmission methods such as lighting of a lamp, display on a monitor, and sounding a buzzer can be used. Therefore, when the user recognizes that the deflection of the battery has reached a predetermined amount by the transmission means, the circuit connected to the battery is cut off or the operation of the apparatus using the battery as a power supply source is stopped. It can be implemented promptly.

  (7) In the battery abnormality detection system of the present invention, it is preferable that a shut-off means for automatically shutting off a circuit connected to the battery when the judgment means judges that the deflection of the battery has reached a predetermined amount. It is characterized by providing.

  According to such a configuration, the circuit connected to the battery is automatically shut off by the shut-off means when it is determined that the deflection of the battery has reached a predetermined amount. Therefore, according to the shut-off means of the present invention, an error such as forgetting to shut off when the circuit connected to the battery is manually shut off does not occur, and the battery is connected when excessive deflection occurs in the battery. The circuit can be shut off reliably.

  (8) The battery abnormality detection method of the present invention covers a power generation element so as to be sandwiched between a pair of exterior films, and seals the power generation element between the exterior films by joining the peripheral portions of the exterior films. A battery that detects an abnormality of a battery in which electrode tabs for transmitting and receiving a current from a power generation element are pulled out from the sealed portion of the exterior film and both ends of the exterior film are supported by a restraint provided in a battery-mounted device An abnormality detection method comprising a detection step of detecting deflection of the battery generated by vibration applied to the battery-equipped device.

  According to such a configuration, it is possible to detect battery deflection caused by vibration applied to the battery-equipped device in the detection step. Therefore, by utilizing this detection result, when excessive deflection occurs in the battery, the circuit connected to the battery can be shut off, or the operation of the apparatus using the battery as a power supply source can be stopped.

  According to the present invention, in a battery-mounted device equipped with a battery in which a power generation element is covered with an exterior film and sealed, a battery abnormality detection system capable of detecting the deflection of the battery caused by vibration applied to the battery-mounted device, and A battery abnormality detection method can be provided.

It is a side view which explains typically a battery loading equipment provided with a battery abnormality detection system of a 1st embodiment. It is explanatory drawing which illustrates a battery provided with the battery abnormality detection system of 1st Embodiment typically, Comprising: (a) is a top view, (b) has shown the side view. It is sectional drawing cut | disconnected by the AA line in Fig.2 (a). It is explanatory drawing which illustrates typically a motion of the acceleration sensor installed in the battery provided with the battery abnormality detection system of 1st Embodiment. It is a side view which illustrates typically a battery mounting apparatus provided with the battery abnormality detection system of a 2nd embodiment. It is a perspective view explaining the conventional battery mounting apparatus typically.

  Hereinafter, embodiments of a battery abnormality detection system and a battery abnormality detection method of the present invention will be described in detail with reference to the drawings.

<First Embodiment>
FIG. 1 is a side view schematically illustrating a battery-equipped device including the battery abnormality detection system of the present embodiment. FIG. 2 is an explanatory diagram schematically illustrating a battery including the battery abnormality detection system of the present embodiment. Here, FIG. 2A shows a top view of the battery, and FIG. 2B shows a side view of the battery. FIG. 3 is a cross-sectional view taken along line AA in FIG. Here, FIG. 3 shows only a cross section on the positive electrode side of the battery of this embodiment, but the negative electrode side has a structure substantially similar to that of the positive electrode side.

  As shown in FIG. 1, the battery-equipped device 1 includes a plurality of batteries 10, restrainers 2 and 3 that restrain each battery 10 at both ends in the longitudinal direction of each battery 10, and acceleration installed in each battery 10. Sensors a, b, c, a CPU 20 (determination means, calculation means) that processes acceleration information obtained from the acceleration sensors a, b, c, and a lamp 30 (transmission means) that is turned on by a command from the CPU 20 are provided. Yes. The acceleration sensors a, b, c, the CPU 20, and the lamp 30 are included in the detection means of the present invention.

  As shown in FIG. 1, each battery 10 is stacked in a plurality of stages, and electrode tabs 14 and 15 of each battery 10 are connected in series or in parallel by unillustrated wiring to form a battery stack assembly. ing. The stacking direction of the battery 10 is mainly the vertical direction as shown in FIG. 1, but it may be stacked in the horizontal direction. For example, the battery stack assembly is housed in a case (not shown), and is connected to an input / output terminal (not shown) via a bus bar (not shown) as a wiring to form an assembled battery. Note that the assembled battery is not limited to the one including one battery stack assembly as in the present embodiment, but includes one in which a plurality of battery stack assemblies are connected in series, parallel, or series-parallel by wiring.

  As shown in FIGS. 2 and 3, the battery 10 has a flat laminated electrode 11 as a power generation element disposed in the center of a pair of laminated films 12 and 13 as a pair of exterior films. The laminated electrode 11 is covered so as to sandwich both sides, and the peripheral portions of the laminate films 12 and 13 are joined by thermal welding to form a sealed portion B, and the electrolyte solution is sealed together with the laminated electrode 11 between the laminated films 12 and 13. Is.

  The laminated electrode 11 is formed by sequentially laminating a plurality of positive electrode plates 11a and negative electrode plates 11b with a separator 11c interposed therebetween, and each positive electrode plate 11a is connected to a positive electrode tab (electrode tab) 14 via a positive electrode lead 11d. On the other hand, each negative electrode plate 11b is connected to a negative electrode tab (electrode tab) 15 via a negative electrode lead (not shown), and the positive electrode tab 14 and the negative electrode tab 15 are pulled out from the sealed portion B of the laminate films 12 and 13 to the outside. Is exposed. The positive electrode tab 14 and the negative electrode tab 15 can be formed of a metal foil such as Al, Cu, Ni, and Fe. In the present embodiment, the positive electrode tab 14 is made of Al and the negative electrode tab 15 is plated with Cu (Ni And Cu bonding material).

  A thermoplastic resin sheet 16 is wound around the base end portions of the positive electrode tab 14 and the negative electrode tab 15. The resin sheet 16 is softened when the laminated films 12 and 13 are thermally welded, so that the sealing performance of the sealed portion B in the positive electrode tab 14 and the negative electrode tab 15 is secured.

  Each battery 10 is supported and laminated by restraints 2 and 3 at both ends in the longitudinal direction of the laminate films 12 and 13 in a state where a gap S is secured in the vertical direction. By blowing cooling air into the gap S, each battery 10 is efficiently cooled. This gap S is about 2 to 5 mm.

  And in each battery 10 of this embodiment, the edge part acceleration sensor a is installed on the positive electrode tab 14 near the edge part by the side of the positive electrode of the laminate film 12 as a detection means which detects the bending of the battery 10. FIG. A central acceleration sensor b is installed near the central portion between both ends of the laminate film 12. Further, an end acceleration sensor c is installed on the negative electrode tab 15 near the end on the negative electrode side of the laminate film 12.

  The acceleration information obtained from these acceleration sensors a, b, and c is taken into the CPU 20 at each time step, and the deflection of the battery 10 (the deflection at the center of the laminate film 12) is calculated by the calculation means provided in the CPU 20. Is done. When the calculated deflection amount of the battery 10 is larger than the predetermined deflection amount stored in the CPU 20, the CPU 20 issues a command for lighting (warning display) to the lamp 30. The user of the battery-equipped device 1 can grasp that the deflection of the battery 10 has reached a predetermined amount by turning on the lamp 30. Note that the predetermined amount of deflection stored in the CPU 20 is the maximum amount of deflection that is expected not to cause a problem in the battery 10.

  Acceleration sensors can be generally classified into three types: mechanical, optical, and semiconductor. In any method, the basic principle is to capture the change in the position of the weight due to acceleration. Among these three types, the mechanical type and the optical type are limited in miniaturization. Therefore, as the acceleration sensors a, b, and c used in this embodiment, small semiconductor type acceleration sensors are used. The semiconductor acceleration sensor has sufficient heat resistance against the temperature increase of the battery 10 of about 60 ° C.

  Semiconductor type acceleration sensors can be classified into three types of capacitance type, piezoresistive type, and gas temperature distribution type, and there are thin type having a thickness of about 3 mm and ultra-thin type having a thickness of about 1 mm. Semiconductor type acceleration sensors have been used in various devices in recent years because of their small size and thinness, and are also installed in remote controls and portable devices for home game machines. Since the acceleration sensors a, b, and c used in the present embodiment need to be accommodated in the gap S having an interval of 2 to 5 mm, an ultra-thin semiconductor type acceleration sensor having a thickness of about 1 mm is used. Although the acceleration sensors a, b, and c can detect accelerations in the three-axis directions, the CPU 20 only needs to capture acceleration information in the vertical direction (z direction).

In addition, the acceleration detection capability of the acceleration sensors a, b, and c used in the present embodiment is the place where the battery-equipped device 1 is installed, the usage environment of the battery-equipped device 1, the seismic performance of the battery 10, the The designer can set as appropriate in consideration of the stacking direction. Since the battery 10 bends due to vibrations in the vertical direction, for example, when the battery-equipped device 1 is installed in a vehicle, the battery-equipped device 1 can be moved to the battery-equipped device 1 in the vertical direction by a slight impact such as climbing a step. An acceleration of 1G = 9.80665 m / s ² ) acts. In the automotive component vibration test method (JIS D 1601), the upper limit of vibration acceleration when performing the vibration function test and the vibration durability test is set to 50G. Therefore, when the battery-equipped device 1 is installed in a vehicle, the acceleration detection capability of the acceleration sensors a, b, and c is preferably 50G.

  FIG. 4 is an explanatory diagram schematically illustrating the movement of the acceleration sensors a, b, and c installed in the battery 10 including the battery abnormality detection system of the present embodiment. FIG. 4 schematically shows the movement of the acceleration sensors a, b, and c when acceleration due to shocking vibrations acts on the battery-equipped device 1 from below to above. Note that the movement of the acceleration sensors a, b, and c shown in FIG. 4 is an example, and the acceleration sensors a, b, and c do not always move as shown in FIG.

In FIG. 4, symbols t _{0 to} t ₅ are time steps for taking acceleration information, symbols α _{0 to} α ₅ are accelerations of the end acceleration sensor a, symbols β _{0 to} β ₅ are accelerations of the central acceleration sensor b, and symbol γ. _{0 to} γ ₅ indicate accelerations of the end acceleration sensor c. Symbols z _{0 to} z ₅ indicate displacements of the end acceleration sensors a and c from the reference line (one-dot chain line in the figure), and symbols δ _{0 to} δ ₅ indicate deflection of the center acceleration sensor b. Note that the accelerations α, β, and γ of the acceleration sensors a, b, and c indicate accelerations caused only by vibrations excluding the gravitational acceleration G. In addition, the magnitudes and action directions of the accelerations α, β, and γ are schematically shown by the lengths and directions of the arrows in the figure.

At time step t ₀ , no acceleration is applied to the acceleration sensors a, b, and c, and the acceleration sensors a, b, and c are stationary on a reference line (dashed line in the figure). During subsequent to time step t _1, when acting acceleration due to impact vibration upward from below the battery-equipped device 1, first, the end acceleration sensors a, joined by acceleration c, end acceleration sensor a , C begins to displace. On the other hand, the center acceleration sensor b starts to be displaced later than the end acceleration sensors a and c by the inertial force acting on the battery 10.

At time step t ₁ , the accelerations of the end acceleration sensors a and c are maximized, and the accelerations are α ₁ and γ ₁ , respectively. On the other hand, the acceleration of the central acceleration sensor b is β ₁ which is considerably smaller than α ₁ and γ ₁ . At this time, the end acceleration sensor a, displacement of c is a z _1, deflection of the central portion acceleration sensor b has a [delta] _1.

At time step t ₂ , the accelerations of the end acceleration sensors a and c gradually weaken, and the accelerations become α ₂ and γ ₂ , respectively. On the other hand, the acceleration of the central acceleration sensor b becomes β ₂ which is larger than α ₂ and γ _{2 due} to the inertial force acting on the battery 1. At this time, the displacements of the end acceleration sensors a and c are z ₂ larger than z _1, and the deflection of the central acceleration sensor b is δ ₂ smaller than δ ₁ .

At time step t ₃ , the accelerations α ₃ and γ ₃ due to the vibration of the end acceleration sensors a and c are zero, and only the gravitational acceleration G is applied to the end acceleration sensors a and c. On the other hand, the acceleration of the central acceleration sensor b is β ₃ smaller than β _{2 due} to the inertial force acting on the battery 1. At this time, the end acceleration sensors a and c are displaced to the uppermost position, the displacement is z _3, and the deflection of the center acceleration sensor b is δ ₃ which is smaller than δ ₂ .

At time step t ₄ , the end acceleration sensors a and c continue to fall due to the gravitational acceleration G. On the other hand, the acceleration of the central acceleration sensor b is β ₄ downward due to the restoring force that elastically restores the deflection of the battery 10. At this time, the battery 10 is bent upward, and the deflection of the central acceleration sensor b is δ ₄ upward.

In time step t _5, the acceleration sensor a, b, c are dropped by gravity acceleration G, the deflection [delta] ₅ of the center-portion acceleration sensor b is zero. Thereafter, the acceleration sensors a, b, and c drop to a reference line (a chain line in the figure).

In the movement of the acceleration sensors a, b, and c described above, at the time step t ₁ immediately after shocking vibration is applied to the battery-equipped device 1 from below to above, the end acceleration sensors a, c, The acceleration difference {(α ₁ + γ ₁ ) / 2−β ₁ } from the central acceleration sensor b is the maximum, and the deflection δ ₁ of the central acceleration sensor b is the maximum.

  In the present embodiment, the accelerations α, β, γ obtained from the acceleration sensors a, b, c are taken into the CPU 20 at every time step t. Then, the calculation means provided in the CPU 20 integrates the acceleration difference {(α + γ) / 2−β} between the end acceleration sensors a and c and the center acceleration sensor b twice in time, and The deflection δ is calculated. Thus, the deflection of the battery 10 can be detected at every time step t.

  The average acceleration (α + γ) / 2 of the end acceleration sensors a and c is the acceleration at the center of the line (dotted line in FIG. 4) connecting the end acceleration sensor a and the end acceleration sensor c. Here, as shown in FIG. 4, when the battery 10 moves only in the vertical direction without rotating, the accelerations α and γ of the end acceleration sensors a and c are equal to each other. Is not required to be averaged, and the acceleration difference (α−β) or (γ−β) can be integrated twice in time to calculate the deflection δ of the central acceleration sensor b. However, when the battery 10 rotates around one end, the accelerations α and γ have different values. Therefore, in order to calculate the deflection δ of the central acceleration sensor b, the average acceleration (α + γ) / 2 Must be used.

  According to such a configuration of the present embodiment, the battery mounted device 1 is added using the detection means including the acceleration sensors a, b, c, the CPU 20 (determination means, calculation means), and the lamp 30 (transmission means). The deflection of the battery 10 caused by vibration can be detected at any time. Further, the user of the battery-equipped device 1 can grasp by the lamp 30 whether or not the deflection of the battery 10 has reached a predetermined amount. Therefore, when the user recognizes that the deflection of the battery 10 has reached a predetermined amount by the lamp 30, the circuit connected to the battery 10 is cut off, or the operation of the apparatus using the battery 10 as a power supply source is stopped. Can be quickly implemented.

  Moreover, according to the calculation means of this embodiment, since the deflection of the battery 10 is calculated by integrating the acceleration difference between the end acceleration sensors a and c and the center acceleration sensor b twice in time, the battery-equipped device 1 The amount of deflection of the battery 10 can be accurately grasped at any time with respect to vibrations of various waveforms acting on the battery.

Second Embodiment
FIG. 5 is a side view schematically illustrating a battery-equipped device including the battery abnormality detection system of the present embodiment. In the first embodiment, the deflection of the battery 10 is detected using the acceleration sensors a, b, and c, whereas in the present embodiment, the deflection of the battery 10 is detected using the laser L. Is different. Since the structure of the battery 10 and the structure of the battery stack assembly by the battery 10 are the same as those in the first embodiment, description thereof will be omitted.

  The battery-mounted device 5 of the present embodiment includes a plurality of laser oscillators d that are attached to a positive-side restraint 6 and oscillate a laser L as detection means for detecting the deflection of each battery 10, and a negative-side restraint. 7 includes a plurality of laser receivers e that receive the laser L, a CPU 20 (determination means), and a lamp 30 (transmission means).

  A pair of laser oscillators d and laser receivers e are arranged between the uppermost part, the lowermost part and the interlayer of each battery 10 stacked in a plurality of stages. In the pair of laser oscillators d and laser receivers e between the layers, The laser L oscillated from the laser oscillator d passes through the gap S between the batteries 10 and is received by the laser receiver e. The laser L is oscillated in parallel to the surface direction of the laminate films 12 and 13 and at a predetermined interval from the surfaces of the laminate films 12 and 13. This fixed interval may be the maximum amount of deflection expected to prevent the battery 10 from malfunctioning.

  Information that each laser receiver e is receiving the laser L is taken into the CPU 20 as needed. When the deflection of the battery 10 occurs and the laser L is blocked by the deflection portion of the battery 10, the CPU 20 determines that the deflection of the battery 10 has reached a predetermined amount by the determination means provided in the CPU 20. A lighting command is issued to 30. The user of the battery-equipped device 1 can grasp that the deflection of the battery 10 has reached a predetermined amount by turning on the lamp 30.

  In addition, the laser L between the layers of each battery 10 detects the deflection when the battery 10 below the laser L bends upward and the deflection when the battery 10 above the laser L bends downward. Do both detection and. Therefore, when the gap S between the batteries 10 is small, the distance between the laser L and the surfaces of the laminate films 12 and 13 cannot be ensured up to the above-described maximum deflection amount. In this case, since the laser L between the layers of each battery 10 is blocked by the bent portion of the battery 10 when the deflection of the battery 10 is small, the laser L between the layers of each battery 10 detects the progress of the deflection of the battery 10. It can be used as an auxiliary means.

  According to such a configuration of the present embodiment, when the deflection of the battery 10 occurs, the laser receiver e detects that the laser L is blocked by the deflection portion of the battery 10, and the deflection of the battery 10 reaches a predetermined amount. Judge that it has reached. That is, by setting the distance between the laser L and the surfaces of the laminate films 12 and 13 equal to the predetermined amount, it is possible to accurately determine whether or not the deflection of the battery 10 has reached the predetermined amount. .

<Other embodiments>
Note that the battery abnormality detection system and the battery abnormality detection method of the present invention are not limited to the above-described embodiments, and have been modified or improved by those skilled in the art without departing from the scope of the present invention. Needless to say, the present invention can be implemented in various forms.

  For example, in the first embodiment, acceleration sensors a and c are installed at two locations on the positive electrode side and the negative electrode side. However, when there is no possibility that the battery 10 rotates around one end and the accelerations on the positive electrode side and the negative electrode side are equal to each other, an acceleration sensor is installed at either one of the positive electrode side or the negative electrode side. Then, the deflection of the battery 10 may be detected by one end acceleration sensor and one central acceleration sensor. Furthermore, when the positive electrode tab 14 and the negative electrode tab 15 are provided only on one side of the battery 10, an acceleration sensor may be provided on the side where the tab is provided and / or on the opposite side.

  In the first embodiment, the acceleration sensors a, b, and c are installed in all the stacked batteries 10. However, the present invention is not limited to this, and one or two of the stacked batteries 10 are used. The acceleration sensors a, b, and c may be installed as described above. When the acceleration sensors a, b, and c are installed in one of the plurality of stacked batteries 10, the acceleration sensor a, the uppermost battery 10 or the lowermost battery 10 considered to be most likely to bend. It is good to install b and c.

  In the first embodiment, the deflection of the battery 10 is calculated by integrating the acceleration difference between the end acceleration sensors a and c and the center acceleration sensor b twice in time. However, the deflection is calculated. Instead, the deflection of the battery 10 may be predicted based on the acceleration difference between the end acceleration sensors a and c and the center acceleration sensor b. In this case, if the relationship between the acceleration difference and the deflection of the central portion of the laminate film 12 is grasped by experiments and analysis, it is determined whether or not the deflection of the battery 10 has reached a predetermined amount based on the acceleration difference. Is possible.

  When the bending rigidity of the battery 10 is large, in the normal use environment of the battery-equipped device 1, the battery 10 hardly bends and there is an acceleration difference between the end acceleration sensors a and c and the center acceleration sensor b. It may be difficult to occur. In such a case, it can be determined that an abnormality has occurred in the battery 10 when a slight acceleration difference is detected between the end acceleration sensors a and c and the center acceleration sensor b.

  Further, in the second embodiment, the laser L between the layers of each battery 10 detects the deflection of both the upper and lower batteries 10 of the laser L. However, when the gap S between the batteries 10 is large, two lasers L are arranged between the upper and lower layers of each battery 10, and the upper laser L detects the deflection of the battery 10 above the laser L. The deflection of the battery 10 below the laser L may be detected by the lower laser L.

  Further, in the second embodiment, a pair of laser oscillators d and laser receivers e are arranged between the uppermost part, the lowermost part and the interlayer of each of the stacked batteries 10, but the laser oscillator d and the laser receiver are interposed between the layers. The laser oscillator d and the laser receiver e may be arranged only at the uppermost part and / or the lowermost part of the stacked batteries 10 without arranging e.

  In the second embodiment, the laser L is used as the detecting means. However, instead of the laser L, a conducting wire is arranged at the position of the laser L, and when the battery 10 is bent, the conducting wire is connected to the battery 10. It can also be configured to detect that the deflection of the battery 10 has reached a predetermined amount by detecting that the energization of electricity has been cut off at the bending portion.

  In the first and second embodiments, the warning is displayed using the lamp 30 as the transmission means. However, a warning sound such as a buzzer can be used as the transmission means instead of the lamp 30.

  In the first and second embodiments, it is assumed that the user who has recognized that the deflection of the battery 10 has reached a predetermined amount manually shuts off the circuit connected to the battery 10. However, it is also possible to employ a configuration that includes a shut-off means that automatically shuts off the circuit connected to the battery 10. In this case, for example, the CPU 20 that has determined that the deflection of the battery 10 has reached a predetermined amount may issue a circuit cutoff command to a switch (shut-off means) provided in a circuit connected to the battery 10.

  In the first and second embodiments, the batteries 10 stacked in multiple stages are each a battery stack assembly in which a gap S is secured in the vertical direction, but the batteries 10 are in close contact with each other in the vertical direction. Thus, the detection means of the present invention may be applied to the stacked battery stack.

DESCRIPTION OF SYMBOLS 1 ... Battery mounting apparatus 2, 3 ... Restraint tool 5 ... Battery mounting apparatus 6, 7 ... Restraint tool 10 ... Battery 11 ... Multilayer electrode (power generation element)
12, 13 ... Laminate film (exterior film)
14 ... Positive electrode tab (electrode tab) 15 ... Negative electrode tab (electrode tab)
20 CPU (determination means, calculation means)
30 ... Lamp (Transmission means)
B ... Sealed part L ... Laser a, c ... End acceleration sensor b ... Center acceleration sensor d ... Laser oscillator e ... Laser receiver t ₁ , t ₂ , t ₃ , t ₄ , t ₅ ... Time step z ₁ , z ₂ , z ₃ , z ₄ , z ₅ ... displacement α ₁ , α ₂ , α ₃ , α ₄ , α ₅ ... acceleration β ₁ , β ₂ , β ₃ , β ₄ , β ₅ ... acceleration γ ₁ , γ ₂ , Γ ₃ , γ ₄ , γ ₅ ... Acceleration δ ₁ , δ ₂ , δ ₃ , δ ₄ , δ ₅ .

Claims (8)

The power generation element is covered with a pair of exterior films, and the power generation elements are sealed between the exterior films by joining the peripheral portions of the exterior films, and electrode tabs for transmitting and receiving current from the power generation elements are provided. In the battery abnormality detection system that detects the abnormality of the battery that is pulled out from the sealed portion of the exterior film and is supported by the restraint provided on the battery-equipped device at both ends of the exterior film,
A battery abnormality detection system comprising detection means for detecting deflection of the battery generated by vibration applied to the battery-equipped device.   The detection means includes an end acceleration sensor installed near at least one end of the both ends of the exterior film, and a center acceleration sensor installed near the center between the both ends of the exterior film; 2. The battery according to claim 1, further comprising: a determination unit that determines that the deflection of the battery has reached a predetermined amount based on an acceleration difference between the end acceleration sensor and the center acceleration sensor. Anomaly detection system.   The said determination means is provided with the calculating means which calculates the bending of the said battery by integrating the said acceleration difference of the said edge part acceleration sensor and the said center part acceleration sensor twice in time. The battery abnormality detection system described.   The detecting means is installed near one end of the both ends of the exterior film and oscillates a laser in parallel with the surface direction of the exterior film, and installed near the other end of the both ends of the exterior film. And a laser receiver for receiving the laser, and when the deflection occurs in the battery, the laser receiver detects that the laser is blocked by the deflection portion of the battery, and the deflection of the battery reaches a predetermined amount. The battery abnormality detection system according to claim 1, further comprising: a determination unit that determines that the battery has reached.   The detecting means includes a conducting wire disposed in parallel to the surface direction of the exterior film at a certain interval in the deflection direction of the battery, a current-carrying portion that conducts electricity to the conducting wire, and a deflection occurs in the battery. And determining means for detecting that the deflection of the battery has reached a predetermined amount by detecting that the conducting wire is cut at the bent portion of the battery and the energization of electricity is cut off. The battery abnormality detection system according to claim 1.   The detection means includes a transmission means for transmitting the determination result to a user of the battery-equipped device when the determination means determines that the deflection of the battery has reached a predetermined amount. The battery abnormality detection system as described in any one of -5.   7. The apparatus according to claim 1, further comprising a blocking unit that automatically blocks a circuit connected to the battery when the determination unit determines that the deflection of the battery has reached a predetermined amount. The battery abnormality detection system as described in any one. The power generation element is covered with a pair of exterior films, and the power generation elements are sealed between the exterior films by joining the peripheral portions of the exterior films, and electrode tabs for transmitting and receiving current from the power generation elements are provided. A battery abnormality detection method that detects an abnormality of a battery that is pulled out from a sealed portion of the exterior film and supported at both ends of the exterior film by a restraint provided in a battery-mounted device,
A battery abnormality detection method comprising a detection step of detecting deflection of the battery generated by vibration applied to the battery-equipped device.

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