JP6390988B2 - Power storage module - Google Patents

Description

  The present invention relates to a power storage module including a power storage element such as a battery cell (unit cell) or a capacitor and an exterior member superimposed on the power storage element. Specifically, the present invention relates to a power storage module having a function of fixing cables such as communication cables and bus bars wired on an exterior member, and other cables.

  A power storage module including a power storage element and an exterior member superimposed on the power storage element is known (for example, Patent Document 1).

  This type of power storage module includes a plurality of power storage elements arranged in a line in one direction and fixed to each other, an exterior member superimposed on the plurality of power storage elements, and a cable wired on the exterior member. I have. A cable fixing portion for holding the cable is provided on the exterior member.

  In the cable fixing portion, a through hole for inserting the cable is formed in one direction. Therefore, when the cable fixing portion is attached on the exterior member, the cable can be wired only in one direction. In other words, the conventional cable fixing portion has a low degree of freedom in cable wiring.

JP 2013-5509 A

  Therefore, an object of the present invention is to provide a power storage module that can increase the degree of freedom of wiring of cables wired outside the power storage module.

The power storage module according to the present invention includes:
A storage element;
An exterior member superimposed on the electricity storage element,
The exterior member is
A case having an opening disposed on a side opposite to the side facing the power storage element, a lid for closing the opening, and a main body covering the power storage element;
Having three or more cable fixing portions protruding on the outer surface of the body of the exterior member,
The cable fixing part is
While projecting from the lid toward the outside of the exterior member,
Has an insertion hole through which a binding member or cable can be inserted,
It said one cable fixing portion of the three or more cable fixing portion is disposed in a central portion of one end side of the present member,
Two other cable fixing portion of said three or more cable fixing portion is spaced apart from each other at the other end of the present body.

According to such a configuration, the cable can be fixed to the cable fixing portion by inserting the binding member or the cable through the insertion hole of the cable fixing portion. In a power storage device in which a plurality of power storage modules are arranged, the cables can meander and be wired at the shortest distance. The cable includes not only communication cables but also wires such as bus bars.

Moreover, as one aspect of the power storage module according to the present invention,
The cable fixing portion protrudes integrally from the outer surface of the main body of the exterior member.

  According to such a configuration, the work of assembling the cable fixing part to the main body part can be eliminated by integrating the main body part and the cable fixing part.

in this case,
The remaining two cable fixing portions of the three cable fixing portions may be arranged symmetrically with respect to one cable fixing portion of the three cable fixing portions.

  According to such a configuration, in the power storage device in which a plurality of power storage modules are arranged, the remaining two cable fixing portions are arranged symmetrically with respect to one cable fixing portion, so that they are arranged in the central portion of adjacent power storage modules. The fixed cable fixing portions face each other, and the fixed cable fixing portions arranged at an interval face each other. The cable fixed to the cable fixing portion arranged in this way can be wired so as to have the shortest distance.

Here, as another aspect of the power storage module according to the present invention,
The exterior member includes a positive external terminal and a negative external terminal for connecting the bus bar,
The cable is routed across the bus bar.

  According to such a configuration, since the cable is wired so as to cross the bus bar, even if a magnetic field is generated by the current flowing through the bus bar, the cable is not easily affected by the magnetic field, and is therefore sent by the cable. It is possible to make it difficult for noise to ride on the signal.

in this case,
The cable fixing part may be provided at a position avoiding the bus bar.

  According to this configuration, by providing the cable fixing portion at a position that avoids the bus bar, the cable fixing position can be made lower than when the cable fixing portion is provided on the bus bar.

Further, as yet another aspect of the power storage module according to the present invention,
A control board for monitoring the storage element;
The main body of the exterior member may be a connection terminal for a communication cable and may have a connection terminal connected to the control board.

  According to this configuration, the control board is accommodated in the exterior member, and the main body portion of the exterior member has the connection terminal for the communication cable, so that the communication cable can be connected to each connection terminal of the adjacent power storage module. it can.

  As described above, according to the present invention, it is possible to provide an excellent effect that it is possible to provide a power storage module that can increase the degree of freedom of the wiring of cables that are wired outside the power storage module.

FIG. 1 is an exploded perspective view of a battery module which is an embodiment of a power storage module according to the present invention. FIG. 2 is a perspective view of a main part of the battery module. FIG. 3 is a perspective view of a power storage device in which a plurality of the battery modules are arranged side by side. FIG. 4 is a perspective view of a power storage device different from that in FIG. 3 in which a plurality of the battery modules are arranged side by side. FIG. 5 shows an exploded perspective view of the battery module.

  Hereinafter, a battery module which is an embodiment of a power storage module according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 5, the battery module 1 includes a plurality of battery cells 3 aligned in the first direction, and arranged between adjacent battery cells 3 and on both sides of the plurality of battery cells 3 in the first direction. A plurality of spacers 5, a plurality of battery cells 3, a frame 7 as a holding body that holds and packages the plurality of spacers 5, and at least one of voltage, current, or temperature of the plurality of battery cells 3 is a battery A cell monitoring circuit (CMU: Cell Monitor Unit) module 9 for monitoring each cell 3 is provided.

  In the following, for the sake of convenience, the first direction is referred to as the X direction (X-axis direction among the orthogonal axes shown in each drawing), and the second direction orthogonal to the first direction is referred to as the Y-direction (shown in each drawing). The third direction orthogonal to the first direction and the second direction is referred to as the Z direction (the Z axis direction among the orthogonal axes shown in each drawing). In each figure, the X, Y, and Z symbols are attached to one side in each of the X, Y, and Z directions. When the Z direction is placed in the vertical direction, the Z direction is the up / down direction, the Y direction is the left / right direction, and the X direction is the front / rear direction.

  As shown in FIG. 5, the battery cell 3 includes a case 30 including a case main body 31 having an opening and a lid 32 that closes and seals the opening of the case main body 31. In case 30, an electrode body (not shown) including a positive electrode plate and a negative electrode plate which are insulated from each other is accommodated. The battery cell 3 is a rectangular battery flat in the X direction.

  The spacer 5 is made of synthetic resin and has an insulating property. The spacer 5 includes a spacer main body 50 and a holding portion 51 that extends from the spacer main body 50 in the X direction and holds the outer peripheral end of the battery cell 3 that faces the spacer main body 50 in the X direction.

  The frame 7 is disposed on both sides of the plurality of battery cells 3 in the X direction, and a pair of termination members 70 (so-called end plates) sandwiching the plurality of battery cells 3 and the plurality of spacers 5 in the X direction, and the pair of termination members 70 are connected to each other, and a connecting member 75 for fastening the plurality of battery cells 3 and the plurality of spacers 5 together is provided. The connecting member 75 extends along the X direction and is parallel to each other with a gap therebetween, and a pair of cross beam portions 76 that connect one end portion and the other end portion of the pair of cross beam portions 76 in the X direction. It has a vertical beam portion 77 and has a rectangular frame shape as a whole.

  The termination member 70 is made of metal such as aluminum formed by casting, for example. The termination member 70 includes a termination member main body 71 and leg portions 72 projecting outward in the X direction from the lower portion of the termination member main body 71. Similarly to the spacer main body 50, the end member main body 71 is formed in a rectangular shape corresponding to the case 30 of the battery cell 3 being rectangular when viewed from the X direction. The end member main body 71 is composed of a rectangular frame portion and lattice-shaped ribs formed in the frame portion, and has a certain thickness in the X direction, but is lightweight and has rigidity. Yes. In addition, a pair of leg portions 72 of the termination member 71 are provided at intervals in the Y direction. Each leg 72 is formed with a through hole (not numbered) through the threaded portion of a bolt (not shown) along the Z direction.

  A pair of connecting members 75 are provided on both sides of the plurality of battery cells 3 in the Y direction. That is, the connecting member 75 includes a connecting member 75 that is arranged to face the plurality of battery cells 3 from one side in the Y direction, and a connecting member 75 that is arranged to face the plurality of battery cells 3 from the other side in the Y direction. ing.

  The cell monitoring circuit module 9 is an exterior member and accommodates a control board 93 on which a cell monitoring circuit is mounted in a circuit case main body 90. The circuit case main body 90 includes a case 91 having an opening and a lid 92 that closes and seals the opening of the case 91. The case 91 includes a rectangular bottom plate 910 and a peripheral wall portion 911 erected from the periphery of the bottom plate 910. The lid 92 is also formed in a rectangular shape.

  Hereinafter, one long side extending in the X direction of the circuit case body 90 is referred to as a first end 90a. The other long side facing in parallel with the first end 90a and extending in the X direction is referred to as a second end 90b. One short side extending in the Y direction connecting one end of the first end 90a and one end of the second end 90b is referred to as a third end 90c. The other short side connecting the other end of the first end 90a and the other end of the second end 90b and facing in parallel with the third end 90c and extending in the Y direction is referred to as a fourth end 90d.

  The mounted control board 93 includes an input connector portion 930 that is a connection terminal and an output connector portion 931 that is a connection terminal. A connector part (not shown) provided at one end of the communication cable 2 connected to the battery monitoring circuit (BMU: Battery Management Unit) 10 (see FIG. 3) is coupled to the input connector part 930 and the output connector part 931. The The output connector portion 931 needs to be open to the outside of the circuit case main body 90 for convenience of connection of the input connector portion from the outside of the circuit case main body 90. Therefore, in the peripheral wall portion 911 of the case 91, a portion corresponding to the output connector portion 931 is cut out and opened.

  The lid 92 is detachably fitted to the opening of the peripheral wall 911 so as to close the opening formed by the peripheral wall 911 of the case 91 in the Z direction. As shown in FIG. 1, the lid body 92 includes locations opposite to the arrangement of the pair of external terminals 35, that is, the intersection of the first end 90 a and the third end 90 c and the first end 90 a and the fourth end 90 d. The corner is provided with an opening 920 for exposing the external terminal 35, and a cap 921 for closing the opening 920 so that the external terminal 35 is not normally exposed.

  And from the outer surface of the cover body 92, the cable fixing | fixed part 95 which fixes the communication cable 2 protrudes in several places. The cable fixing portion 95 is integrally formed with the lid body 92. The cable fixing portion 95 protrudes from the outer surface of the lid 92 at, for example, three locations. In this case, the first cable fixing portion 95a protrudes from the center portion of the first end 90a. That is, the first cable fixing portion 95 a is the first end 90 a of the lid 92 and protrudes from the middle in the stacking direction (X direction) of the battery cells 3. In addition, the power storage module 9 may be arranged biased toward the one end member 70 side. In such a case, the first cable fixing portion 95a is positioned at the middle in the X direction of the line connecting the through hole of the leg portion 72 of the one end member 71 and the through hole of the leg portion 72 of the other end member 71. Then, the first cable fixing portion 95 a is protruded from the outer surface of the lid 92.

  The second cable fixing portion 95b protrudes from the vicinity of the third end 90c of the second end 90b. The third cable fixing portion 95c protrudes from the vicinity of the fourth end 90d of the second end 90b. Therefore, the second cable fixing part 95b and the third cable fixing part 95c are arranged symmetrically with respect to the first cable fixing part 95a. That is, the distance between the first cable fixing part 95a and the second cable fixing part 95b is equal to the distance between the first cable fixing part 95a and the third cable fixing part 95c. Further, the distance between the first cable fixing portion 95a and the second cable fixing portion 95b and the distance between the first cable fixing portion 95a and the third cable fixing portion 95c are determined by the second cable fixing portion 95b and the third cable fixing portion. The distance from the portion 95c is shorter.

  And the cable fixing | fixed part 95 is formed with the insertion hole 951 which inserts the strip | belt-shaped binding member 20 (refer FIG. 2), for example. As shown in FIG. 2, the insertion holes 951 are formed in two directions where the X direction and the Y direction intersect with the Z direction in which the cable fixing portion 95 protrudes.

  In the battery module 1 having the above configuration, a plurality of battery cells 3 are stacked in the X direction while the spacers 5 are disposed therebetween, and the spacers 5 are also disposed outside the battery cells 3 at one end and the other end. A pair of termination members 70 are disposed on both sides, and a pair of connection members 75 are disposed in the plurality of battery cells 3 from the Y direction in a state where a compression force in the X direction is applied between the pair of termination members 70. The screw portions of the bolts 85 inserted into the through holes 771 of the connecting member 75 are screwed into the female screws 710 of the termination member 70, and the plurality of battery cells 3 and the plurality of spacers 5 are integrated with the frame 7. After that, the cell monitoring circuit module 9 is arranged and attached to the plurality of battery cells 3 from the Z direction to complete.

  For example, as shown in FIG. 3, a plurality of battery modules 1 (four in FIG. 3) are arranged and used as a power storage device B. In the power storage device B shown in FIG. 3, the first battery module 1a, the second battery module 1b, and the third battery module 1c are arranged in the Y direction, and the fourth battery module 1d is in the X direction with respect to the third battery module 1c. Are listed. However, in this power storage device B, the connecting members 75 of the adjacent first battery module 1a, second battery module 1b, and third battery module 1c face each other, and the termination member 70 of the third battery module 1c and the fourth battery module 1d. Are facing each other.

  The negative external terminal of the first battery module 1 a and the positive external terminal of the second battery module 1 b are electrically connected by the bus bar 8. Further, the negative external terminal of the second battery module 1 b and the positive external terminal of the third battery module are electrically connected by the bus bar 8. The cable fixing portion 95 is provided at a position that avoids the bus bar 8. The bus bar 8 includes a conductive core and an insulator that covers the core.

  And the input connector part 930 and the output connector part 931 of battery module 1a, 1b, 1c, 1d which adjoins are orient | assigned to the opposite direction alternately. And the connector part (not shown) of the 1st-6th communication cables 2a-2f is connected to the input connector part 930 and the output connector part 931 of this battery module 1a, 1b, 1c, 1d, respectively.

  That is, the first communication cable 2a is connected to the output terminal (not shown) of the BMU 10 and the input terminal 930 of the first battery module 1a. The second communication cable 2b is connected to the output terminal 931 of the first battery module 1a and the input terminal 930 of the second battery module 1b. The third communication cable 2c is connected to the output terminal 931 of the second battery module 1b and the input terminal (not shown) of the third battery module 1c. The fourth communication cable 2d is connected to the output terminal (not shown) of the third battery module 1c and the input terminal 930 of the fourth battery module 1d. The fifth communication cable 2e is connected to the output terminal 931 of the fourth battery module 1d and the input terminal (not shown) of the BMU 10.

  The second communication cable 2b is fixed to the third cable fixing portion 95c of the first battery module 1a in the X direction and is fixed to the first cable fixing portion 95a of the first battery module 1a in the Y direction. In any case, the second communication cable 2b is fixed by inserting the binding member 20 (see FIG. 2) through the insertion hole 951 of the cable fixing portion 95 (hereinafter, description of the binding member 20 is omitted). The second communication cable 2b is fixed in the Y direction to the first cable fixing portion 95a of the second battery module 1b and is fixed in the X direction to the third cable fixing portion 95c of the second battery module 1b.

  The third communication cable 2c is fixed in the Y direction to the third cable fixing portion 95c of the second battery module 1b, and fixed in the Y direction to the third cable fixing portion 95c of the third battery module 1c. The three battery modules 1c are fixed to the first cable fixing portion 95a and the second cable fixing portion 95b in the X direction. The third communication cable 2c is orthogonal to the bus bar 8 that electrically connects the second battery module 1b and the third battery module 1c. The fourth communication cable 2d is fixed in the X direction to the cable fixing portions 95b, 95a, and 95c of the fourth battery module 1d.

  Thus, since the insertion holes 951 are formed in the cable fixing portion 95 in two directions intersecting the X direction and the Y direction, the communication cable 2 can be fixed in the two directions by the binding member 20. The second communication cable 2b is fixed in the X direction and fixed in the third communication cable 2cY direction at the third cable fixing portion 95c of the second battery module. That is, in the battery module 1, the communication cable 2 can be fixed in two directions with one cable fixing portion 95.

  The communication cable 2 is wired so as to be bridged between the cable fixing portion 95 and the cable fixing portion 95 that are closest to each other. By repeating this, the plurality of cables 2 meander and be wired. Since the communication cable 2 wired for the shortest distance does not vibrate greatly, it is difficult for the communication cable 2 to be disconnected or the connector to be disconnected.

  And BMU10 detects the battery cell 3 which is in an abnormal state by detecting the voltage, the electric current, etc. of each battery module 1. FIG. When many battery cells 3 are connected, the current flowing through the bus bar 8 increases. Therefore, the magnetic field around the bus bar 8 is also increased. However, in this embodiment, since the communication cable 2 is wired in a direction orthogonal to the bus bar 8, the signal flowing through the communication cable 2 is not easily affected by the magnetic field of the bus bar 8, and the signal is noisy. It becomes difficult to get on. Therefore, the BMU 10 accurately grasps the state of each battery module 1. Further, when the power storage device B is mounted on, for example, an automobile, a larger number of communication cables 2 are wired. Therefore, in such a case, the efficiency of wiring of the communication cable 2 is required.

  Therefore, the communication cable 2 may be wired so as to be bridged between the cable fixing portion 95 and the cable fixing portion 95 that are not closest to each other, or may be fixed in the same direction with respect to the cable fixing portion 95. . In this case, the power storage device B shown in FIG. 4 will be described. The power storage device B shown in FIG. 4 has a configuration in which the first, second, and third battery modules 1a, 1b, and 1c are arranged in the Y direction. In addition, the connection members 75 of the adjacent battery modules 1a, 1b, and 1c are in a state of facing each other.

  In the power storage device B, the first communication cable 2a is connected to an output terminal (not shown) of the BMU 10 and an input terminal 930 of the first battery module 1a. The second communication cable 2b is connected to the output terminal 931 of the first battery module 1a and the input terminal 930 of the second battery module 1b. The third communication cable 2c is connected to the output terminal 931 of the second battery module and the input terminal (not shown) of the third battery module. The fourth communication cable 2d is connected to the output terminal of the third battery module and the input terminal (not shown) of the BMU 10.

  The second communication cable 2b is fixed in the X direction to the first cable fixing portion 95a of the first battery module 1a. The third communication cable 2c is fixed in the X direction to the second cable fixing portion 95b of the second battery module 1b and the second cable fixing portion 95 of the third battery module 1c. Therefore, in the case of this wiring pattern, the second cable fixing portion 95b is not used. The communication cables 2 are all fixed to the cable fixing portion 95 in the X direction.

  In any case, the power storage device B has a plurality of battery modules 1 connected in a daisy chain by the communication cable 2. Therefore, this power storage device B can detect that the state of the battery cell 3 in each battery module 1 is recognized by the BMU 10 and the battery cell 3 is in an abnormal state. And since the communication cable 2 is being fixed to the cable fixing | fixed part 95, the communication cable 2 is hard to be caught in other components etc., Therefore, it does not break.

  Further, in the battery module 1 having the above configuration, the communication cable 2 can be fixed to the cable fixing portion 95 in a plurality of directions by having a plurality of insertion holes 951 of the cable fixing portion 95 so as to cross each other. Therefore, the battery module 1 has a higher degree of freedom in wiring the communication cable 2.

  Further, in the battery module 1 having the above configuration, since the communication cable 2 is wired so as to intersect the bus bar 8, even if a magnetic field is generated by the current flowing through the bus bar 8, the communication cable 2 has a magnetic field. Therefore, it is possible to make it difficult for noise to be applied to the signal transmitted through the communication cable 2.

  Further, in the battery module 1 having the above configuration, the cable fixing portion 95 is provided at a position that avoids the bus bar 8, so that the fixing position of the communication cable 2 can be set more than when the cable fixing portion 95 is provided on the bus bar 8. Can be lowered.

  Further, in the battery module 1 having the above configuration, the cable fixing part 95 is integrated with the circuit case 90, so that the work of assembling the cable fixing part 95 to the circuit case 90 can be eliminated.

  Further, in the power storage device B in which a plurality of battery modules 1 having the above configuration are arranged, the communication cable 2 can be meandered and wired at the shortest distance. That is, each battery module 1 has first, second, and third cable fixing portions 95a, 95b, and 95c, and has a plurality of insertion holes 951 that intersect the cable fixing portions 95a, 95b, and 95c. Therefore, the communication cable 2 is accurately fixed to the cable fixing portions 95a, 95b, and 95c in an arbitrary direction.

  Further, in the power storage device B in which a plurality of battery modules 1 having the above configuration are arranged, the cable fixing portions 95 arranged in the center portion of the adjacent battery modules 1 face each other and are spaced apart from each other. The cables 95 can face each other, and the cable can be wired and fixed to the cable fixing portion 95 with the shortest distance.

  Further, in the battery module 1 having the above configuration, the control board 93 is accommodated in the circuit case main body 90, and the circuit case main body 90 has the connection terminals for the communication cables 2, so that each of the adjacent battery modules 1 is connected. The communication cable 2 can be connected to the connection terminal.

  In addition, the electrical storage module which concerns on this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

  For example, in the above embodiment, the case where the circuit case main body 90 that houses the cell monitoring circuit is used as the exterior member has been described. However, the circuit module targeted by the present invention is not limited to the cell monitoring circuit module 9 and includes other circuit modules. Furthermore, the exterior member may be a simple plate instead of the circuit case main body 90.

  Moreover, in the said embodiment, the case where the penetration hole 951 penetrates in two directions, X direction and Y direction, was demonstrated. However, the insertion hole 951 may penetrate in three or more directions other than the X direction or the Y direction. Further, the insertion hole 951 may be formed halfway in the X direction or the Y direction, and may be penetrated in an L shape by being formed in the Z direction from the middle.

  Moreover, in the said embodiment, the case where it had three cable fixing | fixed parts 95 was demonstrated. However, four or more cable fixing portions 95 may be provided, or only two may be provided. Moreover, although the cable fixing part 95 demonstrated the case where the 2nd cable fixing | fixed part 95b and the 3rd cable fixing | fixed part 95c were symmetrically arranged on the basis of the 1st cable fixing | fixed part 95a, The cable fixing portion 95c may be disposed asymmetrically.

  Moreover, in the said embodiment, the case where the cable fixing | fixed part 95 was integrally molded with the case 91 was demonstrated. However, the cable fixing portion 95 may be separate from the case 91.

  Moreover, in the said embodiment, the case where the communication cable 2 was used as a cable was demonstrated. However, the cable may be an electric wire such as a bus bar. In particular, if the cable is an electric wire, the cable (electric wire) does not need to be crossed with respect to the bus bar.

  Moreover, in the said embodiment, the electrical storage apparatus B which arranged the 4 or 3 battery module 1 was demonstrated. However, it goes without saying that two or more battery modules 1 may be arranged.

  Moreover, in the said embodiment, the lithium ion secondary battery was demonstrated. However, the type and size (capacity) of the battery are arbitrary.

  Further, the present invention is not limited to the lithium ion secondary battery. The present invention is also applicable to various secondary batteries, other primary batteries, and capacitors such as electric double layer capacitors.

  DESCRIPTION OF SYMBOLS 1 ... Battery module, 2 ... Communication cable, 3 ... Battery cell, 5 ... Spacer, 7 ... Frame, 8 ... Bus bar, 9 ... Cell monitoring circuit (CMU) module, 90 ... Exterior member (circuit case), 91 ... Case, 95: Cable fixing part, 951: Insertion hole

Claims (6)

A storage element;
An exterior member superimposed on the electricity storage element,
The exterior member is
A case having an opening disposed on a side opposite to the side facing the power storage element, a lid for closing the opening, and a main body covering the power storage element;
Having three or more cable fixing portions protruding on the outer surface of the body of the exterior member,
The cable fixing part is
While projecting from the lid toward the outside of the exterior member,
Has an insertion hole through which a binding member or cable can be inserted,
It said one cable fixing portion of the three or more cable fixing portion is disposed in a central portion of one end side of the present member,
Wherein three or more other two cable fixing portion of the cable fixing portion, the power storage modules are spaced apart from one another at the other end of the present body. The power storage module according to claim 1, wherein the cable fixing portion protrudes integrally from an outer surface of the main body of the exterior member. The power storage module according to claim 1 or 2 , wherein the other two cable fixing portions are arranged symmetrically with respect to the one cable fixing portion. The exterior member includes a positive external terminal and a negative external terminal connecting the bus bar,
The power storage module according to any one of claims 1 to 3 , wherein the cable is wired so as to intersect the bus bar. The power storage module according to claim 4 , wherein the cable fixing portion is provided at a position that avoids the bus bar. A control board for monitoring the storage element;
The power storage module according to any one of claims 1 to 5 , wherein the body of the exterior member is a connection terminal for a communication cable and has a connection terminal connected to a control board.

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