JP5180505B2 - Battery module - Google Patents

Battery module Download PDF

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Publication number
JP5180505B2
JP5180505B2 JP2007091291A JP2007091291A JP5180505B2 JP 5180505 B2 JP5180505 B2 JP 5180505B2 JP 2007091291 A JP2007091291 A JP 2007091291A JP 2007091291 A JP2007091291 A JP 2007091291A JP 5180505 B2 JP5180505 B2 JP 5180505B2
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battery
portion
module
connected
part
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JP2008251352A (en
Inventor
満文 後藤
克雄 橋崎
英彦 田島
健彦 西田
克明 小林
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三菱重工業株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation

Description

  The present invention relates to battery installation. In particular, the present invention relates to an installation structure for a lithium ion secondary battery used as a power storage facility in factories, buildings, power generation facilities, and the like.

  There are various storage structures for power storage batteries, such as a steel rack type, a unit type, and a cubicle type. The steel rack type and unit type require special battery compartments, whereas the cubicle type battery modules are housed in steel plate cubicles, making it easy to install indoors and outdoors. High nature.

Prior art documents are described below. For the contents of these documents, see the [Problems to be solved by the invention] column.
Japanese Patent No. 3565271 Japanese Patent No. 3842010 JP 2003-178723 A

  There are known power storage systems installed in factories, buildings, power generation facilities, and the like. Such power storage systems are constantly and frequently subjected to vibrations generated by machine tools, elevators, and the like. In such a case, it is considered that the vibrations received by the power storage system are dominated by the vertical component (vertical direction) from the foundations, beams, floors, etc. of the building. The inventors of the present invention are developing a power storage system using a lithium ion secondary battery, which is suitable for use in such an environment.

Accordingly, an object of the present invention is to improve the vibration resistance of an electric power storage system that is used for a long period of time in an environment subject to steady vibration.
Another object of the present invention is to provide a power storage system having high vibration resistance and flame resistance.

  As a prior art relating to a vibration isolating structure for a battery, Patent Document 1 provides a gas escape structure that releases gas to the outside of the assembled battery even if gas is generated in a plurality of unit cells installed in the assembled battery. In addition, there are described an assembled battery and a method for manufacturing the same, in which both a gas escape structure and a vibration-proof structure are achieved by taking measures against external vibration.

  Patent Document 2 describes a technique related to vibration resistance of in-vehicle electronic devices.

  Patent Document 3 describes a technique related to vibration resistance of a battery. In this technology, the outer surface of the bottom plate portion of the bottomed cylindrical battery container having the bottom plate portion and the side plate portion is covered with the outer bottom vibration-proof sheet, and the outer surface of the side plate portion is covered with the outer-surface vibration-proof sheet. Is done.

  In the following, means for solving the problem will be described using the numbers used in [Best Mode for Carrying Out the Invention] in parentheses. These numbers are added to clarify the correspondence between the description of [Claims] and [Best Mode for Carrying Out the Invention]. However, these numbers should not be used to interpret the technical scope of the invention described in [Claims].

  The power storage system according to the present invention has the following configuration. A plurality of module cases of lithium ion secondary batteries are placed on a cubicle type shelf. A plurality of single cells are arranged inside each module case. The unit cell is supported in a state where it floats from the bottom of the module case via a leaf spring. Adjacent cells are electrically connected by corrugated metal plates. Adjacent battery modules are also electrically connected by corrugated metal plates. A monitoring circuit for monitoring the state of the lithium ion secondary battery is supported in a state of floating horizontally from the module case via a frame-shaped elastic member on the front surface of the module case. With such a configuration, a highly reliable power storage system with respect to long-time vibration is realized.

  More specifically, the battery module (10) according to the present invention includes a first module case (24) supported by a shelf, a first battery (26) housed in the first module case (24), and a first module case (24). The first part (40-1) connected to the first electrode (30) of the battery, the second part (40-2) connected to the first part, and the second part connected to the opposite side of the first part. A metal plate (28) provided with a third portion (40-3). The second part is greatly elastically deformed when the same force is applied as compared to the first part and the third part.

  The battery module (10) according to the present invention is housed in a second module case (24) supported by a shelf and the second module case (24), and is on the third part (40-3) side of the metal plate (28). And a third battery connected to.

  In the battery module (10) according to the present invention, the first module case (24) includes a spring (54) on the bottom surface in contact with the shelf (8).

  In the battery module (10) according to the present invention, the bottom surface of the first battery (26) is supported at a position floating with respect to the bottom surface inside the first module case (24).

  In the battery module (10) according to the present invention, the first electrode (30) is positioned on the first battery (26) when the first module case (24) is placed on the shelf (8). The metal plate (28) has a main surface in the horizontal direction when connected to the first electrode.

  In the battery module (10) according to the present invention, springs (40, 46, 52) that are elastically deformed in the vertical direction are disposed on the bottom surface inside the first module case (24). The first battery (26) is supported by a spring.

  A battery module (10) according to the present invention is housed in a first module case (24) and is a second battery (2) having a second electrode (30) connected to the third portion (40-3) side of the metal plate. 26).

  In the battery module (10) according to the present invention, springs (46, 52) that are elastically deformed in the vertical direction are arranged on the inner bottom surface of the first module case (24). The battery module (10) further includes a support plate (48, 50) supported by the spring and supporting the first battery and the second battery together.

  The battery module (10) according to the present invention supports both the first battery (26) and the second battery (26), and includes a lower surface spring (52) on the lower surface, and the first module case (24) is supported by the lower surface spring. A movable plate (50) supported by the inner bottom surface is provided.

  In the battery module (10) according to the present invention, the first battery is a lithium ion secondary battery. The battery module (10) includes a monitoring circuit (18) that is disposed on a side surface of the first module case (24) and monitors the state of the first battery (26).

  In the battery module (10) according to the present invention, the monitoring circuit is elastically connected to the first module case (24).

  The battery module (10) according to the present invention includes a monitoring circuit mounting portion. The monitoring circuit attachment part includes a connection part (34) connected to the side surface of the first module case (24) and an attachment part (37) connected to the connection part. The monitoring circuit (18) is supported on the side of the attachment portion by the attachment portion.

  In the battery module (10) according to the present invention, the attachment portion (37) is detachably connected to the connection portion (34).

  In the battery module (10) according to the present invention, the attachment portion (37) has a through hole on the opposite side of the first module case (24) with respect to the monitoring circuit (18).

  The power storage system (1) according to the present invention includes a battery module (10) according to the present invention and a shelf (8) that non-fixarily supports a plurality of battery modules that are electrically connected to each other.

According to the present invention, it is possible to improve the vibration resistance of a power storage system that is used for a long period of time in an environment subject to steady vibration.
Furthermore, the present invention provides a power storage system having high vibration resistance and flame resistance.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of the power storage system. The power storage system 1 includes a housing 6. The casing 6 is fixed to the foundation 2 of a facility such as a factory, a building, or a power generation facility with an anchor bolt 4. A shelf 8 for providing a place for placing equipment is installed in a cavity inside the housing 6.

  A plurality of modules 10 are placed on the shelf material 8. The module 10 does not need to be fixed to the shelf material 8 in particular. Each of the plurality of modules 10 generates electric power from an internal lithium ion secondary battery and supplies the electric power from a terminal provided outside. On the front side when placed on the shelf 8 of the module 10, the state of the lithium ion secondary battery (overcharge, overdischarge, etc.) is monitored, and the battery is in a safe state according to the monitoring result. A monitoring circuit 18 that controls to keep is installed.

  Terminals of the plurality of modules 10 are electrically connected to each other by an inter-module connection member 20. The electric power generated by the plurality of modules 10 is collected in the power conversion device 14 placed on the shelf material 8. The power conversion device 14 converts the collected power according to the system power supply of the facility and supplies it to the equipment in the facility. Alternatively, the power conversion device 14 converts the power of the external system power supply to the plurality of modules 10 and supplies the converted power to the plurality of modules 10. The operation of the power storage system 1 is controlled by a control circuit placed on the shelf material 8.

  2A to 2C show the configuration of the module 10. 2A is a top view, FIG. 2B is a side view, and FIG. 2C is a front view. The module 10 includes a module case 24 for housing a plurality of single cells 26. The module case 24 is formed of, for example, a flame retardant resin. A cell support part 40 is provided on the bottom surface of the module case 24. The unit cell support part 40 is disposed at a position corresponding to each of the plurality of unit cells 26 and supports each unit independently. In the example shown in FIG. 2A, the unit cell support portions 40 are arranged at positions corresponding to the four corners of each unit cell 26. The unit cell support part 40 is an elastic member exemplified by a leaf spring. The unit cell support portion 40 is, for example, a spring formed of a flame retardant resin that is molded integrally with the bottom surface of the module case 24. More preferably, the unit cell support portion 40 is a metal spring fixed to the bottom surface of the module case 24. Since such a structure is excellent in heat resistance and fire resistance, it is suitable as a vibration-proof structure for a lithium ion secondary battery.

  The unit cell 26 is put into the module case 10 from the opened upper side and is placed on the unit cell support 40. At this time, there is a gap between adjacent unit cells 26. The unit cell 40 is supported by the unit cell support unit 40 in a state of floating from the bottom surface inside the module case 10.

  The unit cell 26 includes a battery terminal 30 on the upper surface. The electric power generated by the lithium ion secondary battery inside the unit cell 26 is supplied from the battery terminal 30 to the outside. Alternatively, the cell 26 is supplied with electric power from the outside via the battery terminal 30. The battery terminal 30 of the unit cell 26 is electrically connected to the battery terminal 30 of another unit cell 26 adjacent inside the module case 24 via the inter-battery connection member 28, and a group of batteries connected in series or in parallel. Form.

  The inter-battery connection member 28 is basically a plate-like electrode bar that is rigid and maintains its own shape when lifted without applying force. The battery terminal 30 is connected to the battery terminal 30 in a state in which the main surface (wide surface) of the plate is horizontal. Such a battery terminal 30 is preferable in that it can be easily fixed when the distance between adjacent unit cells 26 is short.

  FIG. 3A is a side view showing an example of the shape of the inter-battery connection member 28. The left-right direction in the drawing is the longitudinal direction (the direction in which one battery terminal 30 is aligned with the adjacent battery terminal 30). The inter-battery connection member 28 includes three regions of a first portion 40-1, a second portion 40-2, and a third portion 40-3 along the longitudinal direction. The first portion 40-1 is one end of the inter-battery connection member 28 and is connected to the battery terminal 30 of one unit cell 26. The third portion 40-3 is the other end of the inter-battery connection member 28, and is connected to the battery terminal 30 of another adjacent unit cell 26. The second portion 40-2 is a region sandwiched between the first portion 40-1 and the third portion 40-3.

  The second portion 40-2 is more elastically deformed when the same force is applied as compared to the first portion 40-1 and the third portion 40-3. Due to this property, the second portion 40-2 functions as a spring. In FIG. 3A, the second portion 40-2 has an arch shape bulging upward. In FIG.3 (b), the 2nd part 40-2 is a wave shape which waves in an up-down direction. In FIG.3 (c), the 2nd part 40-2 is (omega) shape which protrudes upwards. In FIG. 3D, the second portion 40-2 is thinner than the other portions. The upper view of FIG. 3 (e) is a plan view, and the lower view is a side view. In this case, as shown in the figure below, the second portion 40-2 is thinner than the other portions as in the case of FIG. And as the upper figure shows, the board width of the 2nd part 40-2 is wide compared with another part. With such a shape, the second section 40-2 absorbs the displacement by elastic deformation, while the necessary cross-sectional area is ensured.

  These shapes are easily formed by pressing a sheet metal. In order to achieve a necessary function as a spring, the inter-battery connection member 28 is uniform in a short direction perpendicular to the longitudinal direction of the main surface, and the shape of an arbitrary cut surface having the short direction as a normal line is It is preferable that they are the same. With these various forms, a spring structure can be formed.

  2A to 2C, one end of the module terminal 32 is electrically connected to the battery terminal 30. The other end of the module terminal 32 is drawn out of the module case 24 through a lead hole 22 provided in the module case 24 and is electrically connected to the inter-module connection member 20. When no external force is applied, there is a gap between the drawing hole 22 and the module terminal 32 and there is no contact. The module terminal 32 and the inter-module connection member 20 have a spring structure similar to that of the inter-battery connection member 28 described with reference to FIGS. 2A to 3.

  A claw 34 is provided on the front side of the module case 24 when placed on the shelf 8. The claw 34 is formed of a flame retardant resin that is molded integrally with the front surface of the module case 24. Alternatively, the claw 34 is a metal member fixed to the front surface of the module case 24.

  An attachment portion 37 is attached to the claw 34. The nail | claw 34 is formed with a flame-retardant resin or a metal. The elastic part 36 which is at least a part of the attachment part 37 is an elastic member. By applying a force to the elastic portion 36, the elastic portion 36 is elastically deformed and can be hooked and fixed to the claw 34.

  A gap is formed between the mounting portion 37 and the front surface of the module case 24. The monitoring circuit 18 is disposed in the gap and is fixed to the attachment portion 37 via the attachment member 38. The monitoring circuit 18 and the cell 26 are electrically connected by a wiring (not shown). In actual assembly, the monitoring circuit 18 is attached to the attachment portion 37 provided with the attachment member 38, and then the attachment portion 37 is hooked on the claw 34 and fixed to the module case 24. With this structure, the monitoring circuit 18 is connected to the module case 24 by an elastic flexible structure by the elasticity of the elastic portion 34. When maintenance of the monitoring circuit 18 is necessary, the monitoring circuit 18 can be easily detached from the module case 24 by elastically deforming the elastic portion 36 and removing it from the claw 34.

  A through hole is provided in a region of the mounting portion 37 opposite to the module case 24 with respect to the monitoring circuit 18. In the case shown in FIG. 2C, the gap portion of the skeleton structure corresponds to the through hole. This through hole improves the heat dissipation of the monitoring circuit 18.

  According to the skeleton-like flexible structure as shown in FIG. 2C, vibration components in the triaxial (vertical, horizontal, longitudinal) directions can be attenuated. Furthermore, since it becomes easy to access the circuit board from the gap portion of the framework, it is possible to improve the degree of freedom of wiring and maintainability.

  The power storage system 1 having the above configuration is used in facilities such as factories, buildings, and power generation facilities. The power storage system 1 receives a steady vibration from the floor. The vibration is transmitted to the bottom surface of the module case 24 through the shelf material 8. The unit cell 26 is elastically supported on the bottom surface of the module case 24 by the unit cell support part 40. Vibration is absorbed by the elastic deformation of the single cell support portion 40, and the vibration of the single cell 26 is suppressed.

  One unit cell 26 in the module case 24 and another unit cell 26 adjacent thereto are elastically coupled by the second portion 40-2 of the inter-cell connection member 28. For this reason, the ripple of one unit cell 26 to other unit cells 26 is suppressed. In particular, the connection between the battery terminal 30 and the inter-battery connection member 28 (realized by a bolt or the like) is prevented from loosening due to long-term steady vibration. The vibration of one module 10 and another adjacent module 10 is also suppressed from spreading to each other due to elastic deformation of the module terminal 32 and the inter-module connecting member 20.

  The monitoring circuit 18 is elastically connected to the module case 24 by a mounting portion 37. Therefore, the vibration applied to the monitoring circuit 18 is alleviated and the reliability when operating in a vibration environment for a long time is improved.

  Since such an anti-vibration structure is provided, the influence of the vibration of the housing 6 on the device is reduced. Therefore, depending on the installation environment, it is not necessary to provide an anti-vibration mechanism for suppressing the vibration of the housing 6 with respect to the foundation 2. If the vibration-proof mechanism of the heavy casing 6 can be omitted, the installation effort and cost can be greatly reduced.

  FIG. 4 shows another example of the mounting structure of the monitoring circuit 18. In this example, the claw 34 a and the attachment portion 37 a are connected via the coil spring 42. Due to the elastic deformation of the coil spring 42, the vibration of the monitoring circuit 18 when the module case 24 is vibrating is alleviated. FIG. 5 shows still another example of the mounting structure of the monitoring circuit 18. In this example, the attachment portion 37 b and the monitoring circuit 18 are connected via a coil spring 44. Such a coil spring 44 is also effective in reducing vibration. In both the examples shown in FIGS. 4 and 5, the vibration is alleviated even when the mounting portion 37 has a rigid structure.

  FIG. 6 shows another example of the vibration isolating structure of the module 10. A movable floor support 46 that is a leaf spring that is elastically deformed in the vertical direction is formed on the bottom surface inside the module case 24. The movable floor support 46 is an elastic member similar to the unit cell support 40 shown in FIGS. 2A and 2B. However, while the unit cell support unit 40 individually supports the unit cells 26, the movable floor support unit 46 supports the plurality of unit cells 26 in common. Therefore, the installation interval of the movable floor support part 46 can be made wider than the installation interval of the unit cell support part 40. In the example of FIG. 6, the movable floor support portions 46 are provided one by one at the four corners of the bottom surface of the module case 24 that houses the four unit cells 26.

  A movable floor 48 is placed on the movable floor support 46. The movable floor 48 is formed of an insulating material such as a flame retardant resin. The movable floor 48 is flat or has an opening (a mesh shape, a punching mesh shape, etc.) that does not hinder the support of the unit cell 26. A plurality of single cells 26 are placed on a movable floor 48 formed of a single plate material. The configurations of the battery terminal 30, the inter-battery connection member 28, the module terminal 32, and the inter-module connection member 20 are the same as those shown in FIGS. Since the monitoring circuit 18 is the same as that shown in FIGS.

  Such an anti-vibration structure suppresses the influence of vibration on the device. Since the plurality of unit cells 26 placed on the same movable floor 48 vibrate in substantially the same phase, the relative displacement of the connection unit between the inter-battery connection member 28 and the battery terminal 30 of the adjacent unit cell 26 is suppressed. . As a result, loosening of the connecting portion is prevented. Due to this characteristic, depending on conditions, a flat electrode bar that does not include the second portion 40-2 having a large elastic deformation can be employed as the inter-battery connection member 28.

  Further, by providing the movable floor 48 with a hole penetrating in the vertical direction, the heat dissipation of the bottom surface of the unit cell 26 can be improved and the cooling effect can be enhanced.

  FIG. 7 shows another configuration example of the movable floor. In this example, no elastic member is provided on the bottom surface of the module case 24. Instead, a movable floor 50, which is an insulating plate material provided with legs 52 having a leaf spring structure, is used. The movable floor 50 is placed on the bottom surface inside the module case 24 with the main surface horizontal. The plate material of the movable floor 50 is supported by the legs 52 at a position floating from the bottom surface of the module case 24. A plurality of single cells 26 are placed on a movable floor 50 formed of a single plate. As a result, the same anti-vibration effect as the configuration example described with reference to FIG. 6 can be obtained. By providing a hole in the movable floor 50, a similar heat dissipation effect can be obtained. Further, in this configuration example, even when a normal case having no vibration isolation structure is used as the module case 24, the vibration isolation effect can be obtained by the movable floor 50.

  8 and 9 show a vibration isolating structure that suppresses vibration of the module case 24. FIG. A module support portion 54 is provided on the outer bottom surface of the module case 24. The module support portion 54 is an elastic member formed of a flame retardant resin. Module 10 is supported by module support 54. When placed on the shelf member 8, a gap is formed between the surface of the shelf member 8 and the bottom surface outside the module case 24. The vibration of the shelf material 8 is absorbed by the elasticity of the module support portion 54, and the vibration transmitted to the module 10 is suppressed. By providing the through hole in the bottom surface of the module case 24, the heat dissipation can be improved. Furthermore, even when the vibration phases of adjacent modules 10 are shifted, the influence of vibration can be reduced while avoiding mutual interference.

The structure of an electric power storage system is shown. It is a top view of a battery module. It is a side view of a battery module. It is a front view of a battery module. The battery connection member is shown. The mounting structure of the monitoring circuit is shown. The mounting structure of the monitoring circuit is shown. The anti-vibration structure provided with a movable floor is shown. The anti-vibration structure provided with a movable floor is shown. The anti-vibration structure that suppresses the vibration of the module case itself is shown. The anti-vibration structure that suppresses the vibration of the module case itself is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electric power storage system 2 ... Base 4 ... Anchor bolt 6 ... Case 8 ... Shelf material 10 ... Module 14 ... Power converter 18 ... Monitoring circuit 20 ... Intermodule connection member 22 ... Lead-out hole 24 ... Module case 26 ... Single cell 28 ... Battery connection member 30 ... Battery terminal 32 ... Module terminal 34 ... Claw 36 ... Elastic part 37 ... Attachment part 38 ... Attachment member 40 ... Single cell support part 40-1 ... First part 40-2 ... Second part 40- 3 ... Third part 42 ... Coil spring 44 ... Coil spring 46 ... Movable floor support 48 ... Movable floor 50 ... Movable floor 52 ... Leg 54 ... Module support

Claims (14)

  1. A first module case supported by a shelf;
    A first battery housed in the first module case;
    A first portion connected to the first electrode of the first battery; a second portion connected to the first portion; and a third portion connected to the opposite side of the second portion to the first portion. A metal plate,
    The second portion is greatly elastically deformed when the same force is applied as compared to the first portion and the third portion,
    A second module case supported by the shelf;
    A third battery housed in the second module case and connected to the third portion side of the metal plate;
    The first module case includes a spring on a bottom surface in contact with the shelf.
  2. The battery module according to claim 1,
    When the first module case is placed on the shelf, the first electrode is positioned on the first battery;
    The battery module has a main surface in a horizontal direction when connected to the first electrode.
  3. The battery module according to claim 1,
    The battery module is supported at a position where a bottom surface of the first battery floats with respect to a bottom surface inside the first module case.
  4. The battery module according to claim 3,
    A spring that is elastically deformed in the vertical direction is disposed on the inner bottom surface of the first module case,
    The battery module is supported by the spring.
  5. The battery module according to any one of claims 1 to 4,
    Further, a first part connected to the second electrode of the first battery, a second part connected to the first part, and a third part connected to the opposite side of the second part to the first part. A second metal plate provided;
    A battery module comprising a second battery that is housed in the first module case and includes a third electrode connected to the third portion of the second metal plate.
  6. The battery module according to claim 1,
    Further, a first part connected to the second electrode of the first battery, a second part connected to the first part, and a third part connected to the opposite side of the second part to the first part. A second metal plate provided;
    A second battery comprising a third electrode housed in the first module case and connected to the third portion side of the second metal plate;
    A spring that is elastically deformed in the vertical direction is disposed on the inner bottom surface of the first module case,
    Furthermore, a battery module comprising a support plate supported by the spring and supporting the first battery and the second battery together.
  7.   The battery module according to claim 5, wherein
      Furthermore, the first battery and the second battery are both supported, a lower surface spring is provided on the lower surface, and the movable plate is supported on the inner bottom surface of the first module case by the lower surface spring.
      A battery module comprising:
  8.   The battery module according to claim 1,
      The first battery is a lithium ion secondary battery,
      And a monitoring circuit disposed on a side surface of the first module case for monitoring a state of the first battery.
      A battery module comprising:
  9.   The battery module according to claim 8, wherein
      The monitoring circuit is elastically connected to the first module case
      Battery module.
  10.   The battery module according to claim 8, wherein
      Further, a first part connected to the second electrode of the first battery, a second part connected to the first part, and a third part connected to the opposite side of the second part to the first part. A second metal plate provided;
      A second battery comprising a third electrode housed in the first module case and connected to the third portion side of the second metal plate;
      The monitoring circuit is elastically connected to the first module case
      Battery module.
  11.   The battery module according to claim 9 or 10,
      Furthermore, it has a monitoring circuit mounting part,
      The monitoring circuit mounting portion is
      A connecting portion connected to a side surface of the first module case;
      Mounting part connected to the connecting part
      And
      The monitoring circuit is supported by the attachment portion on the side surface side than the attachment portion.
      Battery module.
  12.   The battery module according to claim 11,
      The attachment portion is detachably connected to the connection portion.
      Battery module.
  13.   The battery module according to claim 11 or 12,
      The mounting portion has a through hole on the opposite side of the first module case with respect to the monitoring circuit.
      Battery module.
  14.   The battery module according to any one of claims 1 to 13,
      Shelf that supports a plurality of battery modules electrically connected to each other in a non-fixed manner
      And comprising
      Power storage system.
JP2007091291A 2007-03-30 2007-03-30 Battery module Expired - Fee Related JP5180505B2 (en)

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