JP5134937B2 - Battery monitoring device, sealed battery, and sealed assembled battery - Google Patents

Description

  The present invention relates to a battery monitoring device, a sealed battery, and a sealed battery pack.

Lithium ion batteries have a higher energy density than conventional lead-acid batteries, and have a great effect on reducing the size and weight of equipment. For this reason, it has been widely used as a power source for highly portable devices such as mobile phones and laptop computers.
In recent years, attention has been paid to the characteristics of such high energy density, and the manufacture of large batteries for automobiles and standby power supplies has also been promoted. The structure of such a battery is completely sealed, and is provided with a safety valve that is cleaved when the internal pressure reaches a certain value. This is because, when the internal pressure of the battery rises due to an incorrect usage such as a setting error of the charging voltage of the battery, the safety valve is operated to suppress the influence on the surroundings due to the damage of the battery.

  On the other hand, if the battery is used for a long period of time, the internal pressure of the battery may increase slightly due to decomposition of the electrolyte. However, as described above, since this battery has a completely sealed structure, even if the internal pressure rises during use, the internal pressure of the battery is maintained at that pressure if it is below the operating pressure of the safety valve.

  Moreover, in a large-sized lithium ion battery as a sealed battery, a metal can is used as a battery case. However, when the internal pressure is applied over a long period of time, stress remains in the battery case, and there is a possibility that the battery case may be damaged before the design period or unexpected battery case damage may be caused by external force application.

Therefore, in order to grasp the increase in internal pressure as early as possible, a cord-like body is provided on the outer periphery of the sealed battery pack, and the change in the attitude of the cord-like body due to the change in the battery casing is detected to detect the rise in the battery internal pressure. The thing is proposed (for example, refer patent document 1). Moreover, what detects the battery internal pressure rise by detecting the cleavage of the safety valve accompanying the internal pressure rise is proposed (for example, refer patent document 2).
JP 2003-187879 A JP 2005-322471 A

  However, in the battery monitoring device as described in Patent Document 1, when the battery case is made of a member having elasticity such as a resin, it is easily elastically deformed, so that highly accurate measurement is difficult. On the other hand, when the battery case is made of a member such as metal, it is difficult to elastically deform easily. Therefore, highly accurate measurement cannot be performed unless the thickness of the battery case is reduced. On the contrary, if the battery case is made thin, the pressure resistance strength is lowered. Moreover, in the battery monitoring apparatus as described in Patent Document 2, a safety valve is essential.

  The present invention has been made in view of the above circumstances, and regardless of the material and thickness of the battery case, the battery internal pressure can be detected at an early stage to suppress the progress of deterioration of the battery. It is an object of the present invention to provide a battery monitoring device, a sealed battery, and a sealed assembled battery that can improve performance.

The present invention employs the following means in order to solve the above problems.
A battery monitoring apparatus according to the present invention is a battery monitoring apparatus that detects an increase in internal pressure in a sealed battery, and is disposed inside the sealed battery and detects an internal pressure in the sealed battery ; An output unit that outputs a signal indicating the detected internal pressure in the sealed battery , wherein the internal pressure detection unit detects the presence or absence of displacement of the moving body that is displaced according to a change in the internal pressure. The detection unit includes a first detection unit and a second detection unit that are spaced apart in the displacement direction of the moving body, and the first detection unit is a first position during the displacement of the moving body. The second detecting unit detects whether the moving body reaches a second position in the middle of the displacement of the moving body, and the output unit Whether or not the moving body reaches the first position and the second position. Zui and wherein the electrically output the signal.

  According to the present invention, since the internal pressure detector is disposed inside the sealed battery, an increase in the internal pressure can be detected inside the sealed battery, and therefore, regardless of the material and thickness of the battery case. Therefore, it is possible to detect the internal pressure of the sealed battery at an early stage and suppress the progress of battery deterioration.

In the present invention, when the internal pressure in the sealed battery changes, the moving body is displaced, and the displacement of the moving body is detected by the detection unit.
Thereby, the increase in the internal pressure can be detected inside the sealed battery.

  According to the present invention, it is possible to detect to which position the moving body is displaced by detecting the presence or absence of the displacement of the moving body gradually with the displacement of the moving body, and to detect a plurality of threshold values of the internal pressure. be able to.

  Moreover, the battery monitoring apparatus according to the present invention is the battery monitoring apparatus, and includes a guide unit that defines a displacement direction of the moving body.

  In particular, it is preferable that a cylindrical hole through which the moving body passes is provided in the guide portion.

  According to the present invention, the moving body can be moved in the cylindrical hole, and the displacement of the moving body can be detected with higher accuracy.

  The battery monitoring device according to the present invention is the battery monitoring device, wherein a plurality of the detection units are arranged so as to surround the moving body on a virtual plane orthogonal to the direction of displacement of the moving body. It is characterized by that.

According to the present invention, not only can the moving body be guided by the detection unit, but even if one of the detection units fails, the displacement of the moving body at the planar position can be detected by the other detection unit.
The “virtual plane” may be not only one virtual plane but also a plurality of virtual planes.

  The battery monitoring apparatus according to the present invention is the battery monitoring apparatus, further comprising a detection circuit that electrically processes the presence or absence of the displacement detected by the detection unit.

  According to the present invention, the detection of displacement by the detection unit can be electrically processed.

  Further, the battery monitoring apparatus according to the present invention is the battery monitoring apparatus, wherein the detection unit is moved in contact with the movable body and displaced, and the displaced movable contact connected to the detection circuit. And a fixed contact that comes into contact.

  In the present invention, when the movable contact is displaced with the displacement of the moving body and comes into contact with the fixed contact, the detection circuit becomes conductive. Thereby, it can be detected that the moving body has been displaced.

The battery monitoring device according to the present invention, the a battery monitoring device, before Symbol detection circuit comprises a first resistor connected to the first detector, is connected to the second detection unit, A second resistor having a resistance value different from that of the first resistor, and a voltage source in which the first resistor and the second resistor are respectively connected in parallel are provided.

  According to the present invention, the battery internal pressure reaches the internal pressure corresponding to the displacement of the moving body detected by the first detection unit or the second detection unit by detecting the presence or absence of the voltage change of the first resistor and the second resistor, respectively. It can be detected whether or not.

  Further, the battery monitoring device according to the present invention is the battery monitoring device, wherein alarm means for alarming according to the output of the detection unit, or charging circuit included in the sealed battery according to the output of the detection unit An opening means for opening the door is provided.

The present invention can not only detect a change in internal pressure but also issue an alarm or regulate charging in accordance with the internal pressure.
Further, in the battery monitoring device according to the present invention, the output unit is divided according to a position where the movable body is displaceable according to a position where the detection unit is arranged, and any of the divided ranges is selected. The signal indicating whether or not the moving body is displaced within the range is output.
The present invention divides a movable body displaceable range into a plurality of ranges in association with the position where the detection unit is arranged, thereby associating the divided range with a range in which the internal pressure fluctuates. A signal indicating the state of the internal pressure can be output according to the position.
Further, in the battery monitoring device according to the present invention, the output unit is configured such that a state determined according to the risk level of the internal pressure is associated with the divided range, and the signal according to the risk level of the internal pressure is Is output.
The present invention can output a signal corresponding to the risk level of the internal pressure according to the position of the moving body.

  The sealed battery according to the present invention includes the battery monitoring device according to the present invention.

  According to the present invention, it is possible to detect the presence or absence of a change in the internal pressure of the battery by the battery monitoring device.

  A sealed assembled battery according to the present invention includes the battery monitoring device according to the present invention and a plurality of sealed batteries.

  The present invention can detect the presence or absence of a battery that has reached an internal pressure corresponding to the displacement of a moving body among a plurality of sealed batteries.

  According to the present invention, regardless of the material and thickness of the battery case, the internal pressure of the sealed battery can be detected at an early stage to suppress the progress of deterioration of the battery. Reliability can be improved.

A first embodiment according to the present invention will be described with reference to FIGS.
As shown in FIG. 1, a lithium ion battery assembly (sealed battery assembly) 1 according to this embodiment includes a plurality of lithium ion batteries (sealed battery) 2 electrically connected in series via a connection plate 24. And a battery monitoring device 3 that detects whether or not the internal pressure of the lithium ion battery 2 has increased.

  As shown in FIG. 2, each lithium ion battery 2 includes a positive electrode terminal 5 and a negative electrode terminal 6, and a positive electrode layer and a negative electrode layer (not shown) stacked with a separator interposed therebetween and further wound, The current collector 8 connecting the terminals 5 and 6 and the electrode plate group 7, the stainless steel container body 10 in which the electrode plate group 7 and the current collector 8 are housed, the positive electrode terminal 5 and the negative electrode terminal 6. And an upper lid 11 that protrudes from the surface and is in close contact with the container body 10.

  As shown in FIGS. 1 and 3, the battery monitoring device 3 includes a moving body (internal pressure detecting unit) 12 that is displaced according to a change in the internal pressure of the container body 10 of the lithium ion battery 2, and a moving body 12 in the middle of displacement. A micro switch (internal pressure detection unit, detection unit) 13 that is arranged and detects the presence or absence of displacement of the moving body 12, a cylindrical guide unit 15 that is connected to the upper lid 11 and defines the displacement direction of the moving body 12, A bottomed cylindrical cover 16 that closes the insertion hole 11A provided in the upper lid 11 and a detection circuit 17 that electrically processes the presence or absence of displacement detected by the microswitch 13 are provided.

The moving body 12 and the microswitch 13 are provided inside the lithium ion battery 2.
The moving body 12 is arranged so that the insertion hole 11A of the upper lid 11 can protrude and retract. The cylindrical pressure receiving portion 18 that receives the internal pressure, the cylindrical contact portion 20 that is smaller in diameter than the pressure receiving portion 18 and contacts the microswitch 13, and the pressure receiving portion 18 so that the contact portion 20 is disposed at the tip. And a shaft portion 21 that protrudes from the shaft.
The shaft portion 21 has a smaller diameter than the contact portion 20 and does not come into contact with the microswitch 13 even when displaced.
The outer diameter of the pressure receiving portion 18 is formed substantially the same as the inner diameter of the guide portion 15. The pressure receiving portion 18 is provided with a through hole 18A for releasing the internal pressure in the axial direction. A bellows 22 that urges the moving body 12 in the direction opposite to the displacement direction is disposed between the pressure receiving unit 18 and the upper lid 11. The urging force of the bellows 22 is adjusted so that the movable body 12 can be displaced in accordance with the internal pressure.

  The microswitch 13 is a first microswitch (first detection unit) that is connected to the upper lid 11 and is sequentially spaced at a predetermined interval from the columnar body 23 that extends along the displacement direction L of the moving body 12. ) 25, a second micro switch (second detection unit) 26, and a third micro switch 27. The first microswitch 25 is arranged on the most upper lid 11 side, and as shown in FIG. 4, a first movable contact (movable contact) 25 </ b> A that displaces in contact with the contact portion 20 of the moving body 12, and a detection circuit. 17, and a first fixed contact (fixed contact) 25 </ b> B with which the first movable contact 25 </ b> A is displaced and contacts. The second micro switch 26 and the third micro switch 27 have the same configuration, and the second movable contact (movable contact) 26A, the second fixed contact (fixed contact) 26B, the third movable contact (movable contact) 27A, and the second Three fixed contacts (fixed contacts) 27B are provided. For example, the first movable contact 25A, the second movable contact 26A, and the third movable contact 27A are the same low side contact 28A, the first fixed contact 25B is the first high side contact 28B, and the second fixed contact 26B is the first. The second high side contact 28C and the third fixed contact 27B are connected to the detection circuit 17 as the third high side contact 28D.

  The respective arrangements of the microswitches 13 are determined in accordance with the internal pressure increase level based on the pressure resistance of the container body 10 as shown in FIG. In the present embodiment, when the internal pressure reaches the pressure of “alarm level 1”, the first micro switch 25 is arranged such that the contact portion 20 of the moving body 12 contacts the first movable contact 25A of the first micro switch 25. Is arranged. Similarly, when the internal pressure reaches a pressure of “alarm level 2” higher than “alarm level 1”, the contact portion 20 of the moving body 12 comes into contact with the second movable contact 26A of the second micro switch 26. In addition, a second microswitch 26 is arranged. When the third micro switch 27 reaches an internal pressure of “danger level” higher than “alarm level 1” and “alarm level 2”, it is considered dangerous to increase the internal pressure further. The part 20 is arranged so as to contact the third movable contact 27A.

  The detection circuit 17 includes a first resistor 30 connected between the low-side contact 28A and the first high-side contact 28B, and a second resistor 31 connected between the low-side contact 28A and the second high-side contact 28C. The third resistor 32 connected between the low-side contact 28A and the third high-side contact 28D, and the voltage source 33 in which the first resistor 30, the second resistor 31, and the third resistor 32 are connected in parallel. And a wiring 34 for electrically connecting them. The first resistor 30, the second resistor 31, and the third resistor 32 are set to different resistance values. The resistance values of the first resistor 30, the second resistor 31, and the third resistor 32 may be the same.

  That is, a plurality of first micro switches 25 are connected to the first resistor 30 in parallel. Similarly, a plurality of second micro switches 26 are connected to the second resistor 31, and a plurality of third micro switches 27 are connected to the third resistor 32 in parallel.

Next, the operation of the lithium ion assembled battery 1 and the battery monitoring device 3 according to this embodiment will be described.
When the lithium ion battery 2 is used for a long period of time, the deterioration proceeds, and the internal pressure of the container body 10 increases due to decomposition of an electrolyte solution (not shown). At this time, the pressure receiving portion 18 of the moving body 12 is pressurized, and the moving body 12 is displaced along the guide portion 15 while compressing the bellows 22 from the state shown in FIG.

  When the internal pressure further increases, as shown in FIG. 6 (b), the first movable contact 25A of the first microswitch 25 and the contact portion 20 come into contact with each other, and the first movable contact 25A is displaced and the first fixed contact 25B is displaced. Pressed. At this time, the first movable contact 25 </ b> A and the first fixed contact 25 </ b> B are conducted, and a current flows through the first resistor 30 of the detection circuit 17. By detecting the voltage of the first resistor 30, it is detected that the internal pressure of any of the plurality of lithium ion batteries 2 has reached “alarm level 1” shown in FIG.

  When the internal pressure further increases, the contact portion 20 is separated from the first movable contact 25A. Accordingly, the first movable contact 25A is restored and separated from the first fixed contact 25B, and the detection circuit 17 is disconnected. Then, the second movable contact 26A of the second micro switch 26 and the contact portion 20 come into contact with each other, and the second movable contact 26A is displaced and pressed against the second fixed contact 26B. At this time, the second movable contact 26 </ b> A and the second fixed contact 26 </ b> B are conducted, and a current flows through the second resistor 31 of the detection circuit 17. By detecting the voltage of the second resistor 31, it is detected that the internal pressure has reached “alarm level 2” shown in FIG.

  As the internal pressure continues to rise, the contact portion 20 moves away from the second movable contact 26A. Then, the second movable contact 26A and the second fixed contact 26B are separated from each other, and the detection circuit 17 is disconnected. Eventually, the third movable contact 27A of the third microswitch 27 comes into contact with the contact portion 20, and the third movable contact 27A is displaced and pressed against the third fixed contact 27B. At this time, the third movable contact 27 </ b> A and the third fixed contact 27 </ b> B are brought into conduction, and a current flows through the third resistor 32 of the detection circuit 17. By detecting the voltage of the third resistor 32, it is detected that the internal pressure has reached the “danger level” shown in FIG.

  According to the lithium ion assembled battery 1 and the battery monitoring device 3, an increase in the internal pressure can be detected from the presence or absence of the displacement of the moving body 12 by making the displacement of the moving body 12 correspond to the change in the internal pressure in advance. Therefore, unlike the conventional case, the battery internal pressure can be detected at an early stage without providing a safety valve, and the progress of deterioration of the lithium ion battery 2 can be suppressed, and the reliability can be improved. Further, an increase in internal pressure can be accurately detected regardless of the shape and material of the container body 10.

  In particular, the microswitch 13 includes a first microswitch 25, a second microswitch 26, and a third microswitch 27 that are arranged at predetermined intervals in the direction of displacement of the moving body 12. Therefore, the micro switch 13 can gradually detect the presence or absence of displacement of the moving body 12, can detect to which position the moving body 12 has been displaced, and can detect a plurality of threshold values related to internal pressure.

  In addition, a guide unit 15 that defines the displacement direction of the moving body 12 is provided. Therefore, the moving body 12 can be moved along the guide part 15, and the displacement of the moving body 12 can be detected with higher accuracy. At this time, since the pressure receiving portion 18 of the moving body 12 is also provided with the through-hole 18A, when the moving body 12 is displaced, the internal pressure is released and the accuracy of movement of the moving body 12 can be improved.

  Furthermore, the first micro switch 25, the second micro switch 26, and the third micro switch 27 are in contact with the movable contacts 25A, 26A, and 27A and the movable contacts 25A, 26A, and 27A are in contact with the moving body 12, respectively. Fixed contacts 25B, 26B, and 27B. Therefore, the movable contacts 25A, 26A, and 27A are displaced in accordance with the displacement of the moving body 12 and come into contact with the fixed contacts 25B, 26B, and 27B, respectively. Therefore, the detection circuit 17 can be turned on each time, and the presence or absence of displacement of the moving body 12 to a predetermined position can be electrically detected.

  Incidentally, in order to notify the outside of the alarm or open the charging circuit according to the increase in the internal pressure detected by the battery monitoring device 3, as shown in FIG. 7, the alarm is generated according to the output of the microswitches 25, 26 and 27. Alarm means 36 for performing the operation, opening means 37 for opening a charging circuit (not shown) of the lithium ion battery, or a control circuit 40 including an opening switch 38 for the battery circuit (not shown).

The control circuit 40 is connected to the detection circuit 17. And when any one of the first resistor 30, the second resistor 31, and the third resistor 32 described above is used as the control resistor 41, the voltage for detecting the voltage across the control resistor 41 is detected. The first voltage dividing resistor 42A and the second voltage dividing resistor 42B, a comparator 43, and a reference voltage source 45 are provided. The impedance of the first voltage dividing resistor 42A and the second voltage dividing resistor 42B is set to a value sufficiently larger than that of the control resistor 41. The voltage across the second voltage dividing resistor 42B is input to the negative input terminal 43A of the comparator 43, and the positive terminal 43B is connected to the reference voltage source 45. The output terminal 43C of the comparator 43 is connected to the alarm means 36, the opening means 37, or the opening switch 38. The voltage of the reference voltage source 45 is a constant voltage value of about 1V, for example. The voltage across the second voltage dividing resistor 42B (V42B) is the same as the voltage across the control resistor 41 (V41), the impedance of the first voltage dividing resistor 42A (R42A) and the impedance of the second voltage dividing resistor 42B. (R42B) divided by the value, that is,
(V41 / (R42A + R42B)) × R42B = V41 / ((R42A / R42B) +1)
It becomes. Accordingly, by adjusting the impedance ratio of the first voltage dividing resistor 42A and the second voltage dividing resistor 42B, the voltage across the second voltage dividing resistor 42B (V42B) is appropriately set according to the reference voltage source 45. The value can be adjusted.

The comparator 43 compares the both-ends voltage of the control resistor 41 obtained via the second voltage dividing resistor 42B with the voltage of the reference voltage source 45, and when the both-ends voltage of the control resistor 41 becomes larger. , Is configured to output a signal. As a result, when the voltage across the control resistor 41 exceeds the voltage of the reference voltage source 45, that is, when an internal pressure rising to a predetermined pressure is detected, the alarm means 36, the opening means 37, or the opening switch 38 is detected. Can be activated.
The alarm means 36 is for alarming by sound, movement (vibration, etc.), light, or the like. Further, the opening means 37 and the opening switch 38 cut off the continuity when the output from the comparator 43 is inputted.

Next, a second embodiment will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component similar to 1st Embodiment mentioned above, and description is abbreviate | omitted.
The difference between the second embodiment and the first embodiment is that the first micro switch 25, the second micro switch 26, and the third micro switch 27 of the battery monitoring device 50 according to the present embodiment are This is that a plurality of moving planes 12 are arranged so as to surround the plurality of virtual planes P1, P2, and P3 orthogonal to the displacement direction L.

  That is, a plurality of columnar bodies 23 are arranged around the displacement direction L of the moving body 12, and a plurality of first microswitches 25 are arranged on the first virtual plane P1. Similarly, a plurality of second micro switches 26 are arranged on the second virtual plane P2, and a plurality of third micro switches 27 are arranged on the third virtual plane P3.

  According to this battery monitoring device 50, in addition to the same operation and effect as the battery monitoring device 3 according to the first embodiment, the movement of the moving body 12 can only be guided by the microswitches 25, 26, and 27. Instead, even if one microswitch fails on the same virtual plane, the displacement of the moving body 12 can be detected by another microswitch.

Next, a third embodiment will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component similar to other embodiment mentioned above, and description is abbreviate | omitted.
The difference between the third embodiment and the second embodiment is that the guide portion 61 of the battery monitoring device 60 according to this embodiment is different from the main body portion 61A through which the pressure receiving portion 18 of the moving body 12 passes, and the contact portion 20. And a support portion 61B in which a microswitch 62 is supported instead of the columnar body 23.

  The support portion 61B is formed in a cylindrical shape, and the inner diameter D1 of the cylindrical hole 61a is substantially the same as the outer diameter D2 of the contact portion 20 of the moving body 12. The first movable contact 25A, the second movable contact 26A, and the third movable contact 27A of the micro switch 62 are arranged so as to protrude inward of the cylindrical hole 61a. The support portion 61B is attached to the inside of the thick cover 63.

  According to the battery monitoring device 60, in addition to the same operation and effect as the battery monitoring device 3 according to the first embodiment, the pressure receiving portion 18 of the moving body 12 with respect to the main body portion 61A as the internal pressure increases. And the contact part 20 can be slid with respect to the support part 61B, respectively. Therefore, the moving body 12 can be displaced more stably, and the presence or absence of displacement can be detected with higher accuracy.

Next, a fourth embodiment will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component similar to other embodiment mentioned above, and description is abbreviate | omitted.
The difference between the fourth embodiment and the first embodiment is that the shaft portion 72 of the moving body 71 of the battery monitoring device 70 according to this embodiment is provided so as to extend through the pressure receiving portion 73. This is the point.

  The guide portion 75 is provided with a first guide portion 76 having an inner diameter substantially the same as the outer diameter of the pressure receiving portion 73 of the moving body 71, and projecting inward of the first guide portion 76, and the outer diameter of the shaft portion 72. And a second guide portion 77 formed with a cylindrical hole 77A having substantially the same inner diameter. A through hole 77 </ b> B is provided in the second guide portion 77 instead of the pressure receiving portion 73.

  According to the battery monitoring device 70, in addition to the same operation and effect as the battery monitoring device 3 according to the first embodiment, the shaft portion 72 of the moving body 71 is moved relative to the second guide portion 77 as the internal pressure increases. And the pressure receiving part 73 can be slid with respect to the 1st guide part 76, respectively. Therefore, similarly to the third embodiment, the moving body 71 can be displaced more stably, and the presence or absence of displacement can be detected with higher accuracy.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the battery monitoring device detects an increase in internal pressure of the lithium ion assembled battery. However, an increase in internal pressure of only one lithium ion battery 2 may be detected.

  The detection unit is not limited to a micro switch, but may be a mechanical switch such as a push switch, or may be another contact type or optical non-contact type switch sensor. Further, the output from the detection unit may not only be electrically detected by the detection circuit but also simply be visually detected.

  Further, although the battery monitoring device is provided so as to protrude from the upper lid 11, the present invention is not limited thereto, and the battery monitoring device may be arranged so as to be hidden inside the upper lid 11. Moreover, you may use the battery monitoring apparatus which concerns on this invention with the existing lithium ion assembled battery.

1 is a schematic diagram showing a lithium ion assembled battery according to a first embodiment of the present invention. 1 is a schematic diagram showing a lithium ion battery according to a first embodiment of the present invention. It is sectional drawing which shows the internal pressure detection part in the battery monitoring apparatus which concerns on the 1st Embodiment of this invention. It is a circuit diagram which shows the internal pressure detection part in the battery monitoring apparatus which concerns on the 1st Embodiment of this invention. It is a graph which shows the threshold value of the battery internal pressure which the battery monitoring apparatus which concerns on the 1st Embodiment of this invention monitors. (A): It is explanatory drawing which shows an effect | action of the internal pressure detection part in the battery monitoring apparatus which concerns on the 1st Embodiment of this invention. (B): It is explanatory drawing which shows the state which the moving body displaced from the state of (a). It is a principal part circuit diagram which shows the control circuit, alarm means, etc. of the battery monitoring apparatus which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the internal pressure detection part in the battery monitoring apparatus which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the internal pressure detection part in the battery monitoring apparatus which concerns on the 3rd Embodiment of this invention. It is sectional drawing which shows the internal pressure detection part in the battery monitoring apparatus which concerns on the 4th Embodiment of this invention.

Explanation of symbols

1 Lithium-ion battery pack (sealed battery pack)
2 Lithium ion battery (sealed battery)
3, 50, 60, 70 Battery monitoring device 12, 71 Moving object (internal pressure detector)
13 Micro switch (internal pressure detection part, detection part)
15, 61, 75 Guide portion 17 Detection circuit 24 Connection plate 25 First micro switch (first detection portion)
26 Second micro switch (second detector)
25A First movable contact (movable contact)
25B First fixed contact (fixed contact)
26A Second movable contact (movable contact)
26B Second fixed contact (fixed contact)
27A Third movable contact (movable contact)
27B Third fixed contact (fixed contact)
30 1st resistor 31 2nd resistor 32 3rd resistor 33 Voltage source 36 Alarm means 37 Opening means 40 Control circuit 61a, 77A Tube hole L Direction of displacement P1 First virtual plane (virtual plane)
P2 Second virtual plane (virtual plane)
P3 Third virtual plane (virtual plane)

Claims (12)

A battery monitoring device for detecting an increase in internal pressure in a sealed battery,
An internal pressure detection unit that is disposed inside the sealed battery and detects an internal pressure in the sealed battery ;
An output unit that outputs a signal indicating the detected internal pressure in the sealed battery;
Equipped with a,
The internal pressure detector
A detection unit that detects the presence or absence of displacement of the moving body that is displaced according to the change in the internal pressure;
The detector is
Including a first detection unit and a second detection unit that are spaced apart in the displacement direction of the moving body,
The first detection unit detects the presence or absence of displacement of the moving body that reaches a first position during the displacement of the moving body,
The second detection unit detects the presence or absence of displacement of the moving body that reaches a second position in the middle of displacement of the moving body,
The output unit is
The battery monitoring apparatus characterized in that the signal is electrically output based on the presence or absence of displacement of the moving body that reaches each of the first position and the second position . The battery monitoring apparatus according to claim 1 , further comprising a guide unit that defines a displacement direction of the moving body. The battery monitoring device according to claim 2 , wherein a cylindrical hole through which the moving body passes is provided in the guide portion. Wherein the detection unit is battery according to claim 1, any one of 3, characterized in that they are more disposed to surround the moving object on a virtual plane perpendicular to the direction of displacement of the movable body Monitoring device. Battery monitoring device according to claim 1, any one of 4, characterized in that it comprises a detection circuit for electrically processing the presence or absence of displacement the detection unit has detected. A movable contact that is displaced in contact with the moving body;
A fixed contact connected to the detection circuit and contacting the displaced movable contact;
The battery monitoring device according to claim 5 , comprising: Before Symbol detection circuit,
A first resistor connected to the first detector;
A second resistor connected to the second detector and having a resistance value different from that of the first resistor;
A voltage source in which the first resistor and the second resistor are respectively connected in parallel;
The battery monitoring device according to claim 5 , wherein the battery monitoring device is provided. Alarm means for warning in response to the output of the detector, or claim 5, characterized in that it comprises opening means for opening the charging circuit having said sealed battery in accordance with the output of the detector 7 The battery monitoring device according to any one of the above. The output unit is
A range in which the movable body can be displaced is divided according to a position where the detection unit is arranged, and the signal indicating which range the movable body is displaced among the plurality of divided ranges is provided. The battery monitoring device according to claim 1 , wherein the battery monitoring device outputs the battery. The output unit is
The battery monitoring according to claim 9 , wherein a state determined according to the risk level of the internal pressure is associated with the divided range, and the signal according to the risk level of the internal pressure is output. apparatus.   A sealed battery comprising the battery monitoring device according to claim 1.   A sealed assembled battery comprising: the battery monitoring device according to claim 1; and a plurality of sealed batteries.

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