JP2011210455A - Battery cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery cell module capable of aiming at improvement of assemblability and alleviation of conduction failure.SOLUTION: The battery cell module 1 is to be provided with a plurality of battery cells 2, a cell support body 5 fitted to each battery cell 2 and equipped with a conductive through-hole 4 connected to a cell terminal 3 of the battery cell 2, terminal rods 6 inserted into the through-holes 4 of each cell support body 5 to be conductive with the cell terminal 3 of each battery cell 2, and a container 7 containing the battery cells 2 in a laminated state through the cell support bodies 5. By inserting the terminal rods 6 into the through-holes 4 of each cell support body 5, an output of all the battery cells can be obtained so as to have a simple structure, assemblability of the battery cell modules is improved. Even if a position of the cell support body 5 is shifted in a direction of an axis of the terminal rod 6, a conduction state is maintained since the through-holes 4 and the terminal rods 6 are always in contact with each other.

Description

  The present invention relates to a battery cell module.

  The thing of patent document 1 is mentioned as a prior art example of a battery cell module. If the reference of the same literature is attached | subjected and demonstrated, the technique of the same literature will form the insertion part 26 opened so that the positive electrode terminal 22 and the negative electrode terminal 23 of the battery cell 21 may be connected to this through-hole 25. In this structure, a plurality of battery cells 21 are connected by passing a connecting body composed of bolts 46 and the like through the through hole 25 via the insertion portion 26. Since the conductor 31 and the insulator 36 for connecting the battery cells 21 in series are fixed to the coupling body, it is necessary to fix the conductor 31 and the insulator 36, the positive electrode terminal 22, and the negative electrode terminal 23. This document describes that assembly work for connecting terminals can be performed easily and quickly.

JP 2006-260875 A

In the technique of Patent Document 1, although the work of fixing the conductor 31 and the insulator 36 and the positive electrode terminal 22 and the negative electrode terminal 23 is not necessary, the work of alternately attaching the conductor 31 and the insulator 36 to the coupling body Therefore, quick assembly work cannot be expected so much.
Further, when the bolt 46 is loosened due to the influence of vibration or the like and the battery cell 21 is displaced in the axial direction of the bolt 46, the contact pressure between the conductor 31 and the positive electrode terminal 22 and the negative electrode terminal 23 is lost, resulting in poor conductivity. There is a fear.

  The present invention has been created to solve such problems, and an object of the present invention is to provide a battery cell module capable of improving assemblability and reducing conductive defects.

  In order to solve the above problems, a battery cell module of the present invention is provided with a plurality of battery cells, a cell support attached to each battery cell, and having a conductive through hole connected to a cell terminal of the battery cell, A terminal rod that is inserted into a through hole of the cell support and is electrically connected to a cell terminal of each battery cell, and a storage container that stores the battery cells in a stacked manner via the cell support.

  According to the said structure, the output of all the battery cells can be obtained by inserting a terminal rod in the through-hole of each cell support body, a structure becomes simple, and the assembly | attachment property of a battery cell module improves. In addition, since the conductive terminal rod is inserted into the conductive through hole, even if an excessive force is applied and the position of the battery cell and the cell support is displaced in the axial direction of the terminal rod, Since it is always in contact with the terminal rod, there is no conduction failure.

  The battery cell module according to the present invention is characterized in that the cell support is detachably attached to the opening of the storage container by a plug-in method.

  According to the said structure, the assembly | attachment property of a battery cell module improves further, and the storage operation | work of the battery cell with respect to a storage container and the removal operation | work can be performed rapidly.

  The battery cell module of the present invention is characterized in that a charge / discharge changeover switch circuit is provided on a wiring between a cell terminal of the battery cell and the through hole in the cell support.

  According to the said structure, the battery cell module provided with the charge / discharge switching function can be provided, and it can respond to various needs.

  In the battery cell module of the present invention, a terminal connected to the battery cell is provided on the upper surface of the cell support, and the connection circuit board is attached to the cell support so as to be collectively connected to the terminals of all cell supports. It is characterized by being configured to be detachably attached.

  According to the said structure, the signal wiring of all the battery cells can be collected collectively with a simple structure, and a connection with an external device becomes easy.

  Moreover, the battery cell module of the present invention is characterized in that the storage container is configured to store and hold the battery cells at intervals.

  According to the said structure, the contact of the battery cells in a storage container can be prevented.

  According to the present invention, the output of all the battery cells can be obtained by inserting the terminal rods into the through holes of each cell support, the structure is simplified, and the assembly of the battery cell module is improved. And since the conductive terminal rod is inserted into the conductive through hole, even if an excessive force is applied and the position of the battery cell and the cell support is shifted in the axial direction of the terminal rod, Since the terminal rod is always in contact, the conductive state can be maintained.

1 is an external perspective view of a battery cell module according to the present invention. It is expansion explanatory drawing around the through-hole of a cell support body, (a), (b) is a sectional side view, and a front view, respectively. It is a front view which shows the electrical wiring in a cell support body. It is a disassembled perspective view which shows the connection structure of the through-hole of a cell support body, and the cell terminal of a battery cell. It is an external appearance perspective view which shows the state which attaches a connection circuit board to a battery cell module. It is a sectional side view of a battery cell module. It is an external appearance perspective view of a supporting member.

  In FIG. 1, a battery cell module 1 according to the present invention is a cell support having a plurality of battery cells 2 and conductive through holes 4 attached to the battery cells 2 and connected to the cell terminals 3 of the battery cells 2. A body 5, a terminal rod 6 inserted into the through hole 4 of each cell support 5 and conducting to the cell terminal 3 of each battery cell 2, and a storage for storing the battery cells 2 in a stacked manner via the cell support 5. A container 7. The battery cell module 1 is mounted on a hybrid vehicle, for example.

  The battery cell 2 is, for example, a known laminated lithium ion battery, and has a rectangular sheet shape. On the upper surface of the battery cell 2, a pair of rectangular flat cell terminals 3 (a positive terminal 3 </ b> A and a negative terminal 3 </ b> B) are provided so as to protrude in the width direction.

"Cell support 5"
The cell support 5 is a member that extends in the width direction of the battery cell 2 above the battery cell 2, and is formed of a heat-resistant resin material such as an insulating material, for example, an ABS resin. The cell support 5 may be an integrally molded product, or may be one that is divided and assembled, for example, one that is divided into two in the depth direction (left-right direction in FIG. 2A). Good.

  The cell support 5 has a shape in which the lower corners at both ends in the width direction are cut into a rectangle, and the width of the lower part 5B is smaller than that of the upper part 5A. Lower width side surfaces 5C are formed at both ends of the lower portion 5B in the width direction, and flange surfaces 5D are formed at lower surfaces of both ends of the upper portion 5A in the width direction. The side surface in the depth direction of the cell support 5 is formed as a depth side surface 5E. Further, a fitting groove 5F having a rectangular cross section penetrating in the depth direction is formed around the center of the upper surface of the upper portion 5A in the width direction. A connection circuit board 25 is attached to the fitting groove 5F as will be described later. The width dimension of the lower part 5B of the cell support 5 is larger than the width dimension of the battery cell 2, and the depth dimension of the cell support 5 is larger than the depth dimension of the battery cell 2.

  In the middle of the cell support 5 in the vertical direction, a pair of closed circular cross-sectional through holes 4 spaced in the width direction are formed in the depth direction. The interval between the through holes 4 and 4 is substantially the same as the interval between the positive electrode terminal 3 </ b> A and the negative electrode terminal 3 </ b> B of the battery cell 2. The peripheral surface of the through hole 4 is constituted by a conductive layer having conductivity. As a method of forming a conductive layer on the peripheral surface of the through hole 4, in this embodiment, as shown in FIGS. 2 and 4, a conductive annular member (for example, a metal ring) 8 is provided on the peripheral surface of the through hole 4. It is set as the aspect which inserts. The peripheral surface of the through hole 4 and the outer peripheral surface of the annular member 8 are bonded with an adhesive. The surface of the annular member 8 is nickel-plated, for example. Other methods for forming a conductive layer on the peripheral surface of the through hole 4 include a method of applying and baking a conductive paste on the peripheral surface of the through hole 4.

  An example of a connection structure between the positive electrode terminal 3A and the negative electrode terminal 3B of the battery cell 2 and the conductive layer (annular member 8) of the through hole 4 will be described. First, the lead wire 9 is attached to the annular member 8. The lead wire 9 is a general-purpose product such as a copper wire with a coated tube. Since the terminal rod 6 is inserted into the through hole 4 as described later, the lead wire 9 must be provided at a position where it does not interfere with the terminal rod 6. In the present embodiment, as shown in FIG. 4, a part of the lower end of the annular member 8 is bent downward to form a terminal connecting portion 8A, and one end of the lead wire 9 is connected to the terminal connecting portion 8A by spot welding or the like. Thus, interference between the lead wire 9 and the terminal rod 6 (FIG. 1) is avoided. Reference numeral 10 denotes a crimp terminal having one end made of an annular plate portion 10A and the other end made of a rectangular flat plate portion 10B. The lead wire 9 is inserted into and crimped to the annular plate portion 10A of the crimp terminal 10, and the other end is a rectangular flat plate portion 10B. Connected by spot welding or the like.

  On one depth side surface 5E of the cell support 5, a groove 5G having a rectangular cross section with the lower part of the through hole 4 as an upper end is formed along the vertical direction. When the annular member 8 is fitted into the through-hole 4, the annular plate portion 10A of the crimp terminal 10 is fitted in the groove 5G in a press-fit manner. Further, as shown in FIG. 2, the rectangular flat plate portion 10B of the crimp terminal 10 protrudes from the lower surface of the cell support 5, and the positive electrode terminal 3A and the negative electrode terminal 3B are applied to the rectangular flat plate portion 10B, so that the bolt 11 and the nut 12 are provided. It is fastened and fixed by.

  As described above, the positive electrode terminal 3A and the negative electrode terminal 3B of the battery cell 2 and the annular member 8 of the through hole 4 are connected via the lead wire 9 and the crimp terminal 10, and the battery cell 2 is connected to the cell support 5 by the crimp terminal 10. It becomes the aspect suspended. Since the crimp terminal 10 is fitted and positioned and fixed in the groove 5G, the suspended battery cell 2 does not shake. And in the planar view state when the battery cell 2 and the cell support body 5 are assembled together, the battery cell 2 fits between the pair of lower width side surfaces 5C, 5C of the cell support body 5 in the width direction, and in the depth direction. The cell support 5 is laid out so as to fit between the pair of depth side surfaces 5E and 5E. In addition, as a formation aspect of the lead wire 9 and the crimp terminal 10 with respect to the cell support body 5, you may make it the structure shape | molded integrally with the cell support body 5 by insert molding.

  As shown in FIG. 3, the battery cell 2 includes, for example, a built-in temperature sensor 13 that detects the temperature inside the cell. FIG. 3 shows a case where the sensor signal wiring 14 from the temperature sensor 13 is drawn from the side surface of the battery cell 2, and the sensor signal wiring 14 is inside the hollow support member 15 and inside the cell support 5. Is routed to the terminal 18 on the groove bottom surface of the fitting groove 5F. As shown in FIG. 7, the support member 15 is a pipe-shaped resin member arranged vertically, and a groove 15 </ b> A for sandwiching the battery cell 2 in the depth direction is formed in the lower part. The upper periphery of the support member 15 is embedded in the cell support 5. As can be seen from FIG. 6, the depth dimension of the support member 15 (the dimension in the left-right direction in FIG. 6) is the same as the depth dimension of the cell support 5, and when viewed from the side, the end in the depth direction of the support member 15 is the cell. It is continuous with the depth side surface 5E of the support 5 in a straight line.

  Note that other sensors built in the battery cell 2 include a pressure sensor that detects the pressure inside the cell, and these signal wirings, like the sensor signal wiring 14, are arranged inside the support member 15 and the cell support. It is routed through the inside of the body 5 to a predetermined terminal on the groove bottom surface of the fitting groove 5F.

  As shown in FIG. 3, wiring (for example, wiring drawn from the lead wire 9 or the crimp terminal 10 in FIG. 4) that connects one cell terminal 3 of the battery cell 2 and the through hole 4 of the cell support 5, The terminal 19 on the bottom surface of the groove 5F is connected by a cell voltage detection wiring 20. The cell voltage detection wiring 20 is routed inside the cell support 5. Further, a charge / discharge switch circuit 21 is provided on the wiring (for example, the wiring drawn from the lead wire 9 or the crimp terminal 10) that connects one cell terminal 3 of the battery cell 2 and the through hole 4 of the cell support 5. The charge / discharge changeover switch circuit 21 and the terminal 22 on the bottom surface of the fitting groove 5F are connected by a control wiring 23. The charge / discharge changeover switch circuit 21 is composed of, for example, a MOS FET, and the gate electrode is connected to the terminal 22 via the control wiring 23. The charge / discharge changeover switch circuit 21 may be provided inside the cell support 5 or may be provided on the surface of the cell support 5. The control wiring 23 is routed inside the cell support 5.

"Storage container 7"
In FIG. 1, the storage container 7 is a horizontally long rectangular parallelepiped member having an opening for allowing the battery cell 2 to be detachably inserted on the upper surface, and is formed of an insulating material such as a synthetic resin material. Since heat is easily trapped inside the storage container 7 due to the heat generated by the battery cell 2, the material of the storage container 7 is preferably a resin material with particularly excellent heat dissipation, and for example, an inorganic filler such as aluminum nitride is mixed therein. Can improve heat dissipation. Assuming that the long side direction of the storage container 7 is the depth direction and the short side direction is the width direction, the space in the storage container 7 is divided into a plurality of spaces spaced in the depth direction by partition walls 7A extending in the width direction. It is defined. Each of the defined spaces constitutes a battery cell storage chamber 7B that stores one battery cell 2 at a time. A fitting groove 7E having the same cross-sectional shape as the fitting groove 5F of the cell support 5 is formed through the upper surface of the partition wall 7A in the depth direction. As shown in FIG. 6, the partition wall 7 </ b> A is formed in an upper space in the storage container 7, and an opening is formed between the lower end of the partition wall 7 </ b> A and the bottom of the storage container 7 for ventilation.

  The thick portions of the storage container 7 at both ends in the width direction of the battery cell storage chamber 7B are formed lower than the uppermost surface of the storage container 7 (the upper surface at both ends in the depth direction of the storage container 7 and the upper surface of the partition wall 7A). The lower surface constitutes a support surface 7 </ b> C that contacts the flange surface 5 </ b> D of the cell support 5. Since the cell support 5 is mounted on the upper part of the battery cell storage chamber 7B, the depth dimension of the battery cell storage chamber 7B is substantially the same as the depth dimension of the cell support 5 (the dimension between the depth side surfaces 5E and 5E). The width dimension of the battery cell storage chamber 7B is substantially the same as the width dimension of the lower portion 5B of the cell support 5 (the dimension between the lower width side surfaces 5C and 5C).

  The storage container 7 is formed with a pair of rod insertion holes 7D spaced in the width direction along the depth direction. The distance between the rod insertion holes 7 </ b> D and 7 </ b> D is the same as the distance between the through holes 4 and 4 of the cell support 5. The rod insertion hole 7D has a thick portion at least at one end in the depth direction of the storage container 7 so that the terminal rod 6 made of a metal bar can be inserted from the outside of the end of the storage container 7 in the depth direction. These are formed so as to penetrate each partition wall 7A. A locking hook 7 </ b> F for detachably fixing the connection circuit board 25 to the cell support 5 is formed on the upper edge of the thick portion at least one end in the depth direction of the storage container 7. . Furthermore, a cooling fan 24 for cooling the inside of the storage container 7 is attached to one end of the storage container 7 in the depth direction. An attachment 26 is attached to the base end portion of the terminal rod 6, and this attachment 26 is fitted into a counterbore of a rod insertion hole 7 </ b> D formed at the end portion in the depth direction of the storage container 7.

“Assembly procedure of battery cell module 1”
An example of the assembly procedure of the battery cell module 1 will be described. First, the operator holds the battery cell 2 in the battery cell storage chamber 7 </ b> B from the opening on the upper surface of the storage container 7 while holding the cell support 5. The cell support 5 has a depth side surface 5E and an end in the depth direction of the support member 15 in sliding contact with the partition wall 7A of the storage container 7 or the inner wall of the end in the depth direction of the storage container 7, and on the upper surface of the storage container 7. It is inserted into the opening. The lower width side surface 5C is in contact with the inner wall of the end portion in the width direction of the battery cell storage chamber 7B, and the flange surface 5D is in contact with the support surface 7C of the storage container 7, whereby the cell support for the storage container 7 is provided. 5 is completed. That is, the cell support 5 is detachably attached to the storage container 7 by one-touch coupling.

  When the mounting of the cell support 5 is completed, the upper surface and the width direction side surface of the cell support 5 are continuous with the upper surface and the width direction side surface of the storage container 7, respectively. Each battery cell 2 is stored in a stacked manner so that the cell terminals 3 are oriented in the same direction, that is, the positive terminal 3 </ b> A and the negative terminal 3 </ b> B are arranged in the same row in the depth direction of the storage container 7. Further, as shown in FIG. 6, the battery cell 2 does not shake in the battery cell storage chamber 7 </ b> B because the end in the depth direction of the support member 15 contacts the partition wall 7 </ b> A of the storage container 7.

  As a means for holding the cell support 5 in a fitted state with respect to the storage container 7, the cell support 5 and the storage container 7 are formed of a synthetic resin material, and based on the elastic force between them, specifically, the cell. Between the lower width side surface 5C of the support 5 and the inner wall of the end portion in the width direction of the battery cell storage chamber 7B, the depth side surface 5E of the cell support 5 and the partition wall 7A of the storage container 7, and the depth direction end portion of the storage container 7 Since a large frictional force is obtained between the inner wall and the inner wall, the frictional force can be applied to the holding means. Further, since the module monitoring circuit board 25 is later attached to the upper portion of the cell support 5 and is fixed by the engagement hook 7F, the fitting state of the cell support 5 with respect to the storage container 7 is also maintained by this. Will be.

  After storing all the battery cells 2, the pair of terminal rods 6 are inserted into the rod insertion holes 7 </ b> D from the outer ends of the storage container 7 in the depth direction. The terminal rod 6 is conductively coupled to the annular member 8 of each through-hole 4 by being inserted into the through-hole 4 of the battery cell 2 in each battery cell storage chamber 7B in a press-fit manner. The output of all the battery cells 2 can be obtained.

  Further, as shown in FIG. 5, the connection circuit board 25 is fitted into the fitting groove 5 </ b> F of the cell support 5 and the fitting groove 7 </ b> E of the storage container 7, and is fitted to the terminals formed on the connection circuit board 25. The terminals 18, 19, and 22 (FIG. 3) on the groove bottom surface of the groove 5F are in conductive contact. The connection circuit board 25 is detachably fixed to the upper part of the cell support 5 by an engagement hook 7F of the storage container 7. The connection circuit board 25 is a board provided with terminals that are in conductive contact with at least the terminals 18, 19, and 22 of all the cell supports 5, and a signal amplification circuit, a signal conversion circuit, and the like are added as necessary. The cell voltage and internal temperature signals of the battery cell 2 are output to the outside via the connection circuit board 25, and the charge / discharge switching circuit 21 is connected to the cell terminal 3 and the terminal by external control via the connection circuit board 25. The mode can be switched between a discharge mode in which the rod 6 is connected and a charge mode in which the cell terminal 3 and the terminal rod 6 are not connected.

  As described above, a cell support having a plurality of battery cells 2 and conductive through holes 4 attached to each battery cell 2 and connected to the cell terminals 3 (positive electrode terminal 3A, negative electrode terminal 3B) of the battery cell 2 The battery 5 through the cell support body 5, the terminal rod 6 inserted into the through hole 4 of each cell support body 5 and conducting to the cell terminals 3 (positive electrode terminal 3 A, negative electrode terminal 3 B) of each battery cell 2. If the battery cell module 1 includes the storage container 7 that stores the cells 2 in a stacked form, the output of all the battery cells can be obtained by inserting the terminal rod 6 into the through-hole 4 of each cell support 5. This simplifies the structure and improves the assembly of the battery cell module 1.

  In addition, since the terminal rod 6 is inserted into the conductive through-hole 4 and connected to the cell terminal 3 (positive terminal 3A, negative terminal 3B) of each battery cell 2, there is a problem of poor conductivity due to vibration or the like. It will be resolved. That is, in Patent Document 1, when the bolt is easily loosened due to the influence of vibration or the like and the bolt is loosened and the battery cell is slightly displaced in the axial direction of the bolt, the contact pressure between the conductor and the positive electrode terminal and the negative electrode terminal However, in the battery cell module 1 of the present invention, since the conductive terminal rod 6 is inserted into the conductive through hole 4, an unreasonable force is applied. Even if the positions of the battery cell 2 and the cell support 5 are shifted in the axial direction of the terminal rod 6, the through hole 4 and the terminal rod 6 are always in contact with each other, so that a conduction failure does not occur.

  Further, if the cell support 5 is configured to be detachably attached to the opening of the storage container 7 by insertion, the assembly of the battery cell module 1 can be further improved, and the battery cell 2 can be stored in the storage container 7. Removal work can be done quickly.

  Furthermore, in the cell support 5, if the charge / discharge switching circuit 21 is provided on the wiring between the cell terminal 3 and the through hole 4 of the battery cell 2, the battery cell module 1 having a charge / discharge switching function can be provided. It can respond to various needs.

  In addition, a terminal (at least one of the terminals 18, 19, and 22) that is connected to the battery cell 2 is provided on the upper surface of the cell support 5, and the terminals of all the cell supports 5 are connected together. If the connection circuit board 25 is detachably attached to the cell support 5, the signal wirings of all the battery cells 2 can be gathered together with a simple structure, and connection with an external device becomes easy.

  Further, if the storage container 7 is configured to store and hold the battery cells 2 with a space therebetween, contact between the battery cells 2 in the storage container 7 can be prevented.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to those described in the drawings, and various design changes can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Battery cell module 2 Battery cell 3 Cell terminal 3A Positive electrode terminal (cell terminal)
3B Negative terminal (cell terminal)
DESCRIPTION OF SYMBOLS 4 Through-hole 5 Cell support body 6 Terminal rod 7 Storage container 7A Partition wall 7B Battery cell storage chamber 8 Ring member 10 Crimping terminal 18, 19, 22 Terminal 21 Charge / discharge switching switch circuit

Claims (5)

A plurality of battery cells;
A cell support attached to each battery cell and having a conductive through hole connected to the cell terminal of the battery cell;
A terminal rod inserted into the through hole of each cell support and conducting to the cell terminal of each battery cell;
A storage container for storing battery cells in a stacked manner via the cell support;
A battery cell module comprising:   The battery cell module according to claim 1, wherein the cell support is configured to be detachably attached to the opening of the storage container by a plug-in method.   3. The battery cell module according to claim 1, wherein a charge / discharge switching circuit is provided on a wiring between a cell terminal of the battery cell and the through hole in the cell support. On the upper surface of the cell support, a terminal connected to the battery cell is provided,
4. The battery cell module according to claim 3, wherein the connection circuit board is detachably attached to the cell support so as to be connected to the terminals of all the cell supports collectively.   5. The battery cell module according to claim 1, wherein the storage container is configured to store and hold the battery cells with a space therebetween.

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