JP6607052B2 - Battery pack - Google Patents

Description

  The present invention relates to a battery pack including a battery module that houses battery cells and a battery control device that controls the battery cells.

  For example, Patent Literature 1 discloses a battery pack that includes a plurality of battery modules that house a plurality of battery cells and a controller that controls the battery cells. The battery module includes a plurality of battery cells, and various measuring instruments are connected to the battery cells, and the measuring instruments are connected to a controller that controls the battery cells.

  In the battery pack disclosed in Patent Document 1, a plurality of battery modules are provided so that terminal surfaces of the plurality of battery modules are arranged in the same direction, and a controller for controlling the battery cells is provided together with the battery module. Yes.

JP 2007-59088 A

  In the battery pack of Patent Document 1, the electrode terminals of a plurality of battery modules are connected by a connection bus bar, a connector is provided at the end of the wiring, and the end of the wiring extending from the measuring instrument connection terminal is connected to the connector. In some cases, the connection between the devices can be simplified. However, when the battery pack receives an impact from the outside, the connection bus bar and the connector move inside the battery pack, the connection bus bar and the connector come into contact with each other, and a short circuit may occur.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a terminal connection member for connecting between electrode terminals of a battery module, a battery cell measuring instrument, and a battery control device by an external impact. It is in the provision of the battery pack which can prevent the short circuit by the wiring connection member which connects the measuring instrument connection terminal of this by a wiring and contacting.

In order to solve the above problems, the present invention provides a battery cell having a terminal, a measuring instrument for measuring a state of the battery cell, a plurality of battery modules including the battery cell and the measuring instrument, A battery control device for controlling the battery cell, the battery module including an electrode terminal connected to the terminal of the battery cell, and a terminal from which the electrode terminal protrudes A plurality of battery modules, the battery control device comprising: an electrode connection terminal electrically connected to the electrode terminal; and a measurement instrument connection terminal electrically connected to the measurement instrument. The terminal surfaces are arranged in the same direction, provided along the terminal surfaces, connected to the electrode terminals, and electrically connected to the plurality of battery modules, and the measurement In the battery pack, comprising: a first wiring extending from the second wiring; a second wiring extending from the measuring instrument connection terminal; and a wiring connecting member that electrically connects the first wiring and the second wiring. Is in a position that does not overlap with the terminal connection member when viewed from the direction facing the terminal surface, and is in a position that does not overlap with the terminal connection member when viewed from a direction along the terminal surface. It shall be the feature.

  According to the present invention, even if the wiring connecting member and the terminal connecting member move due to an external impact on the battery pack, the wiring connecting member and the terminal connecting member can be prevented from contacting each other. A short circuit with the terminal connection member can be prevented.

Moreover, the external shock to batteries packs, moving the wire connecting member and the terminal connecting member, it is possible to prevent the wiring connecting member and the terminal connection member contacts the wiring connecting member and the terminal connecting members Can be prevented from short-circuiting.

In the battery pack, the wiring connection member may be attached to a bracket fixed to the battery module.
In this case, the wiring connection member can be easily assembled to the outside of the battery module.

In the battery pack, the wiring connection member may be positioned between the bracket and the terminal surface.
In this case, even when the battery pack receives an external impact, the bracket in contact with the battery case receives a load, and the wiring connecting member is protected from the external impact by the bracket.

  The present invention includes a terminal connecting member that connects between electrode terminals of a battery module due to an external impact, and a wiring connecting member that connects a measuring instrument of a battery cell and a measuring instrument connecting terminal of a battery control device by wiring. It is possible to provide a battery pack that can prevent a short circuit due to movement and contact.

It is a perspective view which shows the battery pack which concerns on embodiment of this invention. It is a top view which shows the battery pack which concerns on embodiment of this invention. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG.

  Hereinafter, a battery pack according to an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a battery pack as a power storage device, which is illustrated as a battery pack including a plurality of battery modules including a plurality of battery cells. In the present embodiment, the battery cell is a lithium ion secondary battery.

  As shown in FIG. 1, the battery pack 10 includes a battery case 11, a plurality of battery modules 12, 13, 14, 15, and 16 that house a plurality of battery cells having terminals, and battery control that controls the battery cells. A device 17 and a base 18 on which the battery modules 12 to 16 and the battery control device 17 are placed are provided. The battery modules 12 to 16, the battery control device 17, and the base 18 are accommodated in the battery case 11. In the present embodiment, a battery pack 10 including five battery modules 12 to 16 is illustrated.

  As shown in FIGS. 2 to 4, the battery case 11 has a rectangular shape, and includes a bottom plate 20, side walls 21, 22, 23, and 24 erected from the bottom plate 20, and a top plate 25 facing the bottom plate 20. Is provided. The side wall 21 and the side wall 23 face each other, and the side wall 22 and the side wall 24 face each other. A blower 26 that supplies cooling air for cooling the battery pack 10 to the inside of the battery case 11 is fixed to the outside of the battery case 11 and outside the side wall 21.

  As shown in FIG. 3, in the battery case 11, the plurality of battery modules 12 to 16 are stacked in two stages on the base 18 through spacers that form gaps through which the cooling medium flows, and are placed on the bottom plate 20. ing. The battery modules 12 to 14 as the lower battery modules are arranged side by side from the side wall 21 toward the side wall 23. A battery module 15 as an upper battery module is stacked on the battery module 12 with a spacer interposed therebetween. The battery module 16 as the upper battery module is stacked on the battery module 14 with a spacer interposed therebetween.

  As shown in FIG. 1, the battery module 12 includes a side surface 30 that faces the side wall 22 of the battery case 11. The battery module 13 includes a side surface 31 that faces the side wall 22. The battery module 14 includes a side surface 32 that faces the side wall 22. The battery module 15 includes a side surface 33 that faces the side wall 22. The battery module 16 includes a side surface 34 that faces the side wall 22. The plurality of side surfaces 30 to 34 are arranged in the same direction and are located on the same horizontal plane.

  A positive electrode terminal 35 and a negative electrode terminal 36 as a pair of electrode terminals of the battery modules 12 to 16 protrude from the side surfaces 30 to 34. The electrode terminal is connected to the terminal of the battery cell accommodated in the battery modules 12-16. The side surfaces 30 to 34 are terminal surfaces on which electrode terminals protrude.

  The battery module 12 includes a lower surface 37 that faces the bottom plate 20 of the battery case 11. The battery module 13 includes a lower surface 38 that faces the bottom plate 20 of the battery case 11. The battery module 14 includes a lower surface 39 that faces the bottom plate 20 of the battery case 11. The battery module 15 includes an upper surface 40 that faces the top plate 25 of the battery case 11. The battery module 16 includes an upper surface 41 that faces the top plate 25 of the battery case 11.

  A battery control device 17 is disposed between the upper battery module 15 and the battery module 16. The battery control device 17 includes a side surface 42 that faces the side wall 22 of the battery case 11 and faces the same side as the terminal surfaces of the battery modules 12 to 16. The battery control device 17 includes a battery ECU (not shown), a service plug 43, a system main relay (not shown), a terminal block 44, a monitoring board 29, and the like. The battery ECU controls the battery cell according to various information of the battery cell, the service plug 43 cuts off the voltage, and the system main relay is an electrical switch connected to an external electric circuit.

  As shown in FIG. 3, the terminal block 44 is arranged to face the side wall 22 and the top plate 25 of the battery case 11, and is connected to a system main relay or the like of the battery control device 17. 45A, 45B, 45C, 45D. A monitoring substrate 29 is disposed below the terminal block 44 so as to face the side wall 22. The monitoring board 29 includes a plurality of measuring instrument connection terminals 63A, 63B, 63C, 63D, and 63E. A measuring instrument connection terminal 63A is positioned below the electrode connection terminal 45A, a measuring instrument connection terminal 63B is positioned below the electrode connection terminal 45B, and a measuring instrument connection terminal 63D is positioned below the electrode connection terminal 45C. The measuring instrument connection terminal 63E is located below the electrode connection terminal 45D.

  The positive terminal 35 of the battery module 12 is electrically connected to the negative terminal 36 of the adjacent battery module 15 by a connection bus bar 46A formed of a conductive member. The negative terminal 36 of the battery module 12 is electrically connected to the positive terminal 35 of the adjacent battery module 13 by a connection bus bar 46B which is a long plate member. The positive terminal 35 of the battery module 15 is connected to the electrode connection terminal 45A and the terminal wiring 47A. The negative terminal 36 of the battery module 13 is connected to the electrode connection terminal 45C and the terminal wiring 47C. Therefore, the battery module 12, the battery module 13, the battery module 15, and the battery control device 17 are electrically connected in series.

  The positive terminal 35 of the battery module 14 is connected to the electrode connection terminal 45B and the terminal wiring 47B. The negative terminal 36 of the battery module 14 is electrically connected to the positive terminal 35 of the battery module 16 by a connection bus bar 46C that is a long plate member. The negative terminal 36 of the battery module 16 is connected to the electrode connection terminal 45D and the terminal wiring 47D. Therefore, the battery module 14, the battery module 16, and the battery control device 17 are electrically connected in series. The connection bus bars 46A to 46C are terminal connection members of the present invention.

  Each of the battery modules 12 to 16 includes a voltage sensor that is connected to the battery cell and measures the voltage of the battery cell, and a temperature sensor that measures the temperature of the battery cell. The voltage sensor and the temperature sensor are measuring instruments that measure the state of the battery cell. One end of the first wiring 48A is connected to a voltage sensor and a temperature sensor. One end of the first wiring 48B is connected to a voltage sensor and a temperature sensor. One end of the first wiring 48C is connected to a voltage sensor and a temperature sensor. One end of the first wiring 48D is connected to a voltage sensor and a temperature sensor. In the battery module 16, one end of the first wiring 48E is connected to a voltage sensor and a temperature sensor. The voltage sensor and the temperature sensor are the measuring instruments of the present invention.

  The first wiring 48 </ b> A extends from the inside of the battery module 12 through the center of the side surface 30 and extends to the outside of the battery module 12 along the side surface 30. The first wiring 48 </ b> B extends from the inside of the battery module 13 through the center of the side surface 31 and extends to the outside of the battery module 13 along the side surfaces 31 and 30. The first wiring 48 </ b> C extends from the inside of the battery module 14 through the center of the side surface 32 and extends to the outside of the battery module 14 along the side surface 32. The first wiring 48 </ b> D extends from the inside of the battery module 15 through the center of the side surface 33 and extends to the outside of the battery module 15 along the side surface 33. The first wiring 48 </ b> E extends from the inside of the battery module 16 through the center of the side surface 34 and extends to the outside of the battery module 16 along the side surface 34.

  As shown in FIG. 1, one end of a bracket 49, which is a long plate member made of resin and having an L-shaped cross section, is fixed to the base 18 via bolts. The other end of the bracket 49 is fixed to the upper surface 40 of the battery module 15 via a bolt. As shown in FIG. 4, the bracket 49 extends between the upper surface 40 and the side surface 33 of the battery module 15, the side surface 30 of the battery module 12, and the inner surface of the battery case 11. As shown in FIG. 2, the outer surface of the bracket 49 is in contact with the inner surface of the side wall 22 of the battery case 11.

  As shown in FIG. 1, one end of a bracket 54, which is a long plate member made of resin and having an L-shaped cross section, is fixed to the base 18 via bolts. The other end of the bracket 54 is fixed to the upper surface 41 of the battery module 16 via a bolt. The bracket 54 extends between the upper surface 41 and the side surface 34 of the battery module 16, the side surface 32 of the battery module 14, and the inner surface of the battery case 11. As shown in FIG. 2, the outer surface of the bracket 54 is in contact with the inner surface of the side wall 22 of the battery case 11.

  As shown in FIG. 3, connectors 60 </ b> A, 60 </ b> B, and 60 </ b> C are fixed to the bracket 49 via bolts. Connectors 60D and 60E are fixed to the bracket 54 via bolts. The connectors 60A to 60E are rectangular plate-like members, and electrically connect a plurality of wires. The connectors 60A to 60E are wiring connection members of the present invention.

  As shown in FIG. 4, the connectors 60 </ b> A to 60 </ b> C are located between the bracket 49 and the side surface 30 of the battery module 12 and the side surface 33 of the battery module 15. 33 is not in contact. Similarly, the connectors 60C and 60D are located between the bracket 54 and the side surface 32 of the battery module 14 and the side surface 34 of the battery module 16 and are in contact with the bracket 54, but are not in contact with the side surfaces 32 and 34. Absent.

  As shown in FIG. 3, the connectors 60 </ b> A to 60 </ b> E are in positions that do not overlap with the connection bus bars 46 </ b> A to 46 </ b> C when viewed from the direction facing the side surfaces 30 to 34 and 42. As shown in FIGS. 2 and 4, the connection bus bar 46A is located closer to the side surfaces 30 and 33, and the connectors 60A to 60C are arranged at positions farther from the side surfaces 30 and 33 than the connection bus bar 46A. The connection bus bar 46B is located closer to the side surfaces 30 and 31, and the connectors 60A to 60C are arranged at positions farther from the side surfaces 30 and 31 than the connection bus bar 46B. Similarly, the connection bus bar 46C is located closer to the side surfaces 32 and 34, and the connectors 60D and 60E are arranged at positions farther from the side surfaces 32 and 34 than the connection bus bar 46C. For this reason, the connectors 60A to 60E are in positions that do not overlap with the connection bus bars 46A to 46C when viewed from the direction along the side surfaces 30 to 34, 42.

  As shown in FIG. 3, one end of the first wiring 48A is connected to the voltage sensor and the temperature sensor of the battery module 12, and the other end of the first wiring 48A is connected to the connector 60B. One end of the first wiring 48B is connected to the voltage sensor and the temperature sensor of the battery module 13, and the other end of the first wiring 48B is connected to the connector 60A. One end of the first wiring 48C is connected to the voltage sensor and the temperature sensor of the battery module 14, and the other end of the first wiring 48C is connected to the connector 60D. One end of the first wiring 48D is connected to the voltage sensor and the temperature sensor of the battery module 15, and the other end of the first wiring 48D is connected to the connector 60C. One end of the first wiring 48E is connected to the voltage sensor and the temperature sensor of the battery module 16, and the other end of the first wiring 48E is connected to the connector 60E. The first wirings 48 </ b> A to 48 </ b> E are in positions that do not overlap with the connection bus bars 46 </ b> A to 46 </ b> C when viewed from the direction facing the side surfaces 30 to 34 and 42.

  As shown in FIG. 3, one end of the second wiring 64D is connected to the measuring instrument connection terminal 63A. One end of the second wiring 64A is connected to the measuring instrument connection terminal 63B. One end of the second wiring 64B is connected to the measuring instrument connection terminal 63C. One end of the second wiring 64C is connected to the measuring instrument connection terminal 63D. One end of the second wiring 64E is connected to the measuring instrument connection terminal 63E.

  The other end of the second wiring 64A is connected to the connector 60B. The other end of the second wiring 64B is connected to the connector 60A. The other end of the second wiring 64C is connected to the connector 60D. The other end of the second wiring 64D is connected to the connector 60C. The other end of the second wiring 64E is connected to the connector 60E. The second wirings 64 </ b> A to 64 </ b> E are in positions that do not overlap with the connection bus bars 46 </ b> A to 46 </ b> C when viewed from the direction facing the side surfaces 30 to 34 and 42.

  The battery control device 17 and the voltage sensors and temperature sensors of the battery modules 12 to 16 are electrically connected via the first wires 48A to 48E, the second wires 64A to 64E, and the connectors 60A to 60E. . Therefore, the information regarding the voltage and temperature from the voltage sensor and the temperature sensor is sent to the battery control device 17 via the first wires 48A to 48E, the second wires 64A to 64E, and the connectors 60A to 60E.

In the present embodiment, the following operations and effects are achieved.
(1) The connectors 60A to 60E are in positions that do not overlap with the connection bus bars 46A to 46C when viewed from the direction facing the side surfaces 30 to 34, 42. Accordingly, when the battery pack 10 receives a load from the side wall 22 to the side wall 24 of the battery case 11 or a load from the side wall 24 to the side wall 22 due to an external impact on the battery pack 10, for example, the connectors 60A to 60A. Even if 60E and connection bus bars 46A-46C move, it can prevent that connectors 60A-60E and connection bus bars 46A-46C contact. Therefore, a short circuit between the connectors 60A to 60E and the connection bus bars 46A to 46C can be prevented.

(2) The connectors 60A to 60E are in positions that do not overlap with the connection bus bars 46A to 46C when viewed from the direction along the side surfaces 30 to 34, 42. Therefore, for example, when the battery pack 10 receives a load from the side wall 21 to the side wall 23 of the battery case 11 or a load from the side wall 23 to the side wall 21 due to an external impact on the battery pack 10, the connector 60 </ b> A˜ Even if 60E and connection bus bars 46A-46C move, it can prevent that connectors 60A-60E and connection bus bars 46A-46C contact. Therefore, a short circuit between the connectors 60A to 60E and the connection bus bars 46A to 46C can be prevented.

(3) The connectors 60A to 60C are attached to the bracket 49 fixed to the base 18 and the battery module 15, and the connectors 60D and 60E are attached to the bracket 54 fixed to the base 18 and the battery module 16. . Therefore, the connectors 60A to 60E can be easily assembled outside the battery modules 12 to 16.

(4) The connectors 60A to 60C are located between the bracket 49 and the side surfaces 30 and 33 as terminal surfaces, and the connectors 60D and 60E are located between the bracket 54 and the side surfaces 32 and 34 as terminal surfaces. . Therefore, even when an external impact is received on the side wall 22 of the battery pack 10, the brackets 49 and 54 that are in contact with the side wall 22 receive a load. Therefore, the connectors 60A to 60E are protected from external impacts by the brackets 49 and 54.

(5) The brackets 49 and 54 are long plate members having an L-shaped cross section and are fixed to the battery modules 15 and 16, and the outer surfaces of the brackets 49 and 54 are in contact with the inner surface of the side wall 22. Therefore, the battery modules 12 to 16 are positioned with respect to the battery case 11 by the brackets 49 and 54. Further, in the battery case 11, a gap is provided between the side surfaces 30 to 34 of the battery modules 12 to 16, the side surface 42 of the battery control device 17, and the side wall 22 of the battery case 11, and the side surfaces 30 to 34, 42 are provided. And the contact with the side wall 22 is prevented. Therefore, the positive electrode terminal 35 and the negative electrode terminal 36 can be protruded from the side surfaces 30 to 34 of the battery modules 12 to 16, and the electrode connection terminals 45 </ b> A to 45 </ b> D of the terminal block 44 and the monitoring board 29 are provided on the side surface 42 of the battery control device 17. Measuring instrument connection terminals 63A to 63E can be provided. Further, between the side surfaces 30 to 34 of the battery modules 12 to 16 and the side wall 22 of the battery case 11, connection bus bars 46A to 46C, connectors 60A to 60E, terminal wirings 47A to 47D, and first wirings 48A to 48E. The second wirings 64A to 64E can be disposed.

  The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the gist of the invention. For example, the following modifications may be made.

In the above embodiment, the battery pack 10 in which the five battery modules 12 to 16 are stacked in two stages and accommodated in the battery case 11 is taken as an example. Any battery pack that houses a plurality of battery modules in a battery case may be used. For example, the plurality of battery modules may be stacked in three or four stages, and the number of battery modules is not particularly limited. Further, the battery module is not limited to a battery module including a plurality of battery cells, but may be a battery module including a single battery cell.

In the above embodiment, the electrode terminals of the battery module are electrically connected by the connection bus bar. It is only necessary that the electrode terminals can be electrically connected, and wiring may be used.

In the above embodiment, the connection bus bar is formed of a conductive member. The connection bus bar only needs to be able to electrically connect the electrode terminals, and the conductive member may be formed to be covered with an insulating resin cover.

In the above embodiment, the bracket is made of resin. It is only necessary that the connector can be fixed by the bracket, and it may be made of metal such as iron or aluminum.

In the above embodiment, the bracket is a long plate member having an L-shaped cross section. The shape of the bracket is not particularly limited as long as the connector can be fixed to the outside of the battery module inside the battery case.

In the above embodiment, two brackets are arranged on the battery pack, but this is not the case. The connector can be fixed by the bracket, and it is sufficient that the connector does not overlap the connection bus bar when viewed from the direction facing the terminal surface. For example, one bracket for fixing a plurality of connectors to one battery pack is arranged. The number of brackets is not particularly limited.

10 Battery pack 12, 13, 14, 15, 16 Battery module 17 Battery control device 35 Positive electrode terminal (as electrode terminal)
36 Negative terminal (as electrode terminal)
30, 31, 32, 33, 34 Side surface (as terminal surface)
42 Side 45A, 45B, 45C, 45D Electrode connection terminal 46A, 46B, 46C Connection bus bar (as terminal connection member)
48A, 48B, 48C, 48D, 48E First wiring 49, 54 Bracket 60A, 60B, 60C, 60D, 60E Connector (as wiring connection member)
63A, 63B, 63C, 63D, 63E Measuring instrument connection terminals 64A, 64B, 64C, 64D, 64E Second wiring

Claims (3)

A battery cell with a terminal;
A measuring instrument for measuring the state of the battery cell;
A plurality of battery modules including the battery cell and the measuring instrument;
A battery control device that is provided together with the plurality of battery modules and controls the battery cells;
The battery module is
An electrode terminal connected to the terminal of the battery cell;
A terminal surface on which the electrode terminal protrudes,
The battery control device is:
An electrode connection terminal electrically connected to the electrode terminal;
A measuring instrument connection terminal electrically connected to the measuring instrument,
The terminal surfaces of the plurality of battery modules are arranged in the same direction,
A terminal connecting member that is provided along the terminal surface and is connected to the electrode terminal to electrically connect the plurality of battery modules;
A first wiring extending from the measuring instrument;
A second wiring extending from the measuring instrument connection terminal;
In a battery pack comprising: a wiring connecting member that electrically connects the first wiring and the second wiring;
The wiring connection member is in a position that does not overlap the terminal connection member when viewed from the direction facing the terminal surface, and is not overlapped with the terminal connection member when viewed from the direction along the terminal surface. A battery pack characterized by that.   The battery pack according to claim 1, wherein the wiring connection member is attached to a bracket fixed to the battery module. The battery pack according to claim 2 , wherein the wiring connecting member is located between the bracket and the terminal surface.

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