JP5811796B2 - Assembled battery - Google Patents

Assembled battery Download PDF

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Publication number
JP5811796B2
JP5811796B2 JP2011252962A JP2011252962A JP5811796B2 JP 5811796 B2 JP5811796 B2 JP 5811796B2 JP 2011252962 A JP2011252962 A JP 2011252962A JP 2011252962 A JP2011252962 A JP 2011252962A JP 5811796 B2 JP5811796 B2 JP 5811796B2
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battery
voltage detection
battery module
cell
electrode terminal
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JP2013109914A (en
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大徳 修
修 大徳
幸憲 水野
幸憲 水野
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株式会社デンソー
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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; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Description

  The present invention relates to an assembled battery having a voltage detection line.

  Patent Document 1 discloses a battery pack in which a plurality of battery cells are stacked in a row in the cell thickness direction and connected in series as a conventional technique. In this assembled battery, a voltage detection line for detecting a voltage is wired so that the upper surface of the battery cell extends in the cell thickness direction.

JP 2011-34883 A

  Generally, in an assembled battery, a magnetic field is generated when current flows through a plurality of battery cells constituting the assembled battery. A signal line attached to the assembled battery in order to acquire information about the battery may be affected by a magnetic field due to current. When the influence of noise applied to the signal line is increased by this magnetic field, it becomes difficult for the battery monitoring device to acquire accurate information on the battery.

  Here, in the assembled battery of Patent Document 1, the positive electrode terminal and the negative electrode terminal that form both ends in a plurality of battery cells connected in series are located at both ends in the cell thickness direction of the assembled battery. For this reason, the path | route of the electric current which flows through an assembled battery shows the direction which goes to the other end from an end of an assembled battery in a cell thickness direction. On the other hand, since the voltage detection line of Patent Document 1 is wired so as to extend in the cell thickness direction, the direction in which the voltage signal moves through the voltage detection line is the same as the direction of the current path. For this reason, there is a problem that the noise received by the voltage signal tends to increase.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide an assembled battery that reduces the influence of noise received by the voltage detection line.

The present invention employs the following technical means to achieve the above object. The invention relating to the assembled battery according to claim 1 includes a plurality of battery cells (20-22, 30) each having an electrode terminal (20a-22a, 30a-32a) composed of a positive electrode terminal and a negative electrode terminal protruding from the outer case. ~ 32),
A plurality of bus bars (40 to 43) for connecting the electrode terminals so as to connect the plurality of battery cells in series;
A plurality of voltage detection lines (50a, 51a, 52a, 53a) wired to transmit voltage signals detected from detection terminals connected to predetermined positions of the plurality of battery cells,
A plurality of battery cells are formed by laminating a predetermined number of battery cells in the cell thickness direction (T), and are arranged in two rows adjacent to the cell width direction (W) ( 2) and a second laminated battery module (3),
All the battery cells constituting the stacked battery modules (2, 3) arranged adjacent to each other in two rows are connected in series,
The electrode terminal (20a) forming one end of the series connection and the electrode terminal (32b) forming the other end are arranged on the same side of the laminated battery module,
A plurality of voltage detection lines connected to the first stacked cell module and the second stacked cell module after being drawn out from the respective detection terminals, wired as summarized by one bundled wires (50B), 1 A bundle of wires (50B) is wired so as to extend in the cell thickness direction between adjacent stacked battery modules (2, 3),
On both sides of one bundle wire, the directions of currents flowing through the first stacked battery module and the second stacked battery module are opposite to each other along the cell thickness direction.

According to the present invention, by arranging the electrode terminals forming both ends of the series connection in the two-layer battery module in the cell width direction on the same side, the main current path in the assembled battery is the positive terminal on the total terminal portion. The form which makes a U-turn from the negative electrode side terminal is drawn. In this U-turned current path, two rows of stacked battery modules are arranged adjacent to each other, so that the first current vector from one end side of the total terminal portion to the other end side of the assembled battery and the other end of the assembled battery It is formed by a second current vector that is folded back by the battery cell located on the side and is opposite to the first current vector. In the present invention, since the stacked battery modules in two rows are arranged adjacent to each other, the first current vector and the second current vector are vectors that are adjacent in opposite directions. Since the magnetic fields generated by the respective current vectors cancel each other, as a result, the strength of the magnetic field due to the current flowing through the assembled battery can be greatly reduced as compared with the prior art. Therefore, since the influence of the magnetic field on the voltage detection line parallel to the current vector can be reduced, it is possible to provide an assembled battery that suppresses the absolute amount of noise to the voltage detection line.
Furthermore, since the region between adjacent stacked battery modules is located in the middle of the U-turn current path, it is a place that is not easily affected by the magnetic field. Therefore, according to the present invention, it is possible to provide an assembled battery that further suppresses the absolute amount of noise to the voltage detection line by arranging the bundle of voltage detection lines in a place that is not easily affected by the magnetic field. .

According to claim 2 , the voltage detection lines (50a, 51a, 52a, 53a) are drawn out to the side where the electrode terminals (20a, 32b) forming both ends of the series connection are arranged in the multilayer battery module (2, 3). It is characterized by that.

  According to the present invention, the lead-out side of the voltage detection line and the electrode terminals forming both ends in the assembled battery are collected on the same side. Thereby, in the battery pack including the battery monitoring device for detecting the voltage, the control device for controlling charging / discharging, and the like, it is possible to simplify by arranging and arranging the components related to various connections.

According to claim 3 , comprising a plurality of temperature detection lines (60, 61) wired to transmit temperature signals detected from detection terminals connected to predetermined positions of a plurality of battery cells,
The temperature detection line is drawn to the opposite side with respect to the stacked battery module (2, 3) from the side from which the electrode terminal and the voltage detection line are drawn.

  According to the present invention, the temperature detection line that is a relatively low voltage line is arranged away from the current path and voltage detection line that are high voltage. Thereby, the influence of noise on the temperature detection line can be reduced, and the accuracy of temperature detection can be increased.

  Note that the reference numerals in parentheses described in the claims and the above-described means are examples of a correspondence relationship with the specific means described in the embodiments described later as one aspect, and are technical terms of the present invention. It does not limit the range.

It is the schematic which shows the assembled battery which concerns on 1st Embodiment to which this invention is applied. It is a perspective view which shows the assembled battery of 1st Embodiment. It is a top view which shows the assembled battery of 1st Embodiment. It is the schematic which shows the assembled battery which concerns on 2nd Embodiment to which this invention is applied. It is a perspective view which shows the assembled battery of 2nd Embodiment. It is a top view which shows the assembled battery of 2nd Embodiment. It is the schematic which shows the assembled battery which concerns on 3rd Embodiment to which this invention is applied. It is a perspective view which shows the assembled battery of 3rd Embodiment. It is a top view which shows the assembled battery of 3rd Embodiment. It is the schematic which shows the assembled battery which concerns on 4th Embodiment to which this invention is applied.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration. Not only combinations of parts that clearly show that combinations are possible in each embodiment, but also combinations of the embodiments even if they are not explicitly stated unless there is a problem with the combination. Is also possible.

(First embodiment)
A first embodiment to which the present invention is applied will be described with reference to FIGS. In each figure, T is the cell thickness direction of a rectangular parallelepiped battery cell, W is the cell width direction, and H is the cell height direction. The cell thickness direction T is also a stacking direction of a plurality of battery cells. The cell width direction W is a direction perpendicular to both the cell thickness direction T and the cell height direction H. In the assembled battery 1 of the first embodiment, the cell height direction H is set to the vertical direction. The assembled battery 1 is used in, for example, a hybrid vehicle that uses a traveling drive source by combining an internal combustion engine and a motor driven by electric power charged in the battery, an electric vehicle that uses a motor as a travel drive source, and the like.

  The assembled battery 1 includes at least a case 10 and a plurality of battery cells accommodated in the case 10. The assembled battery 1 has a configuration in which a predetermined number of battery cells are arranged in the cell thickness direction T, and two rows of battery cells are arranged in the cell width direction W. Specifically, the predetermined number of battery cells are arranged in the cell thickness direction T. The two stacked battery modules 2 and 3 formed by stacking the battery cells are arranged in the cell width direction W. The first laminated battery module 2 and the second laminated battery module 3 are connected in series so that they can be energized by connecting all the battery cells constituting these modules in series. The battery cell is, for example, a nickel metal hydride secondary battery, a lithium ion battery, or an organic radical battery. The battery cell is housed in a housing, under a car seat, between a rear seat and a trunk room, a driver seat and a passenger seat. It is arranged in the space between.

  The plurality of battery cells constituting the assembled battery 1 are also single cells, and have, for example, an outer case that constitutes an outer shell such as an aluminum can, and a positive electrode terminal that protrudes upward from one end surface of the rectangular parallelepiped outer case; Each has an electrode terminal composed of a negative electrode terminal. The assembled battery 1 includes a plurality of bus bars that connect the electrode terminals so that all the battery cells are connected in series.

  A safety valve is provided in the outer case of each battery cell. Each safety valve is located between the positive electrode terminal and the negative electrode terminal, and is set to break when the internal pressure of the battery cell becomes an abnormal pressure. The safety valve is configured, for example, by sticking and closing a thin metal film in a hole opened in the end face of the outer case of the battery cell. In this case, when the internal pressure of the battery cell becomes abnormal, the metal film is broken and the hole of the outer case is opened, and the gas inside the battery cell is released to the outside of the outer case. As a result, the cell internal pressure is reduced, and the battery itself can be prevented from rupturing.

  The case 10 is a deep box shape that can accommodate the entire battery cell therein, and is a member that holds the battery cell 20 by supporting an outer case of the battery cell. The case 10 is formed of a synthetic resin such as polypropylene, polypropylene containing filler or talc, for example. The case 10 is formed to include a lid portion 10a and four side plates 10b and 10c that surround four sides of the lid portion 10a. The side plates 10b and 10c of the case 10 are provided with a plurality of attachment portions 14 for fixing the assembled battery 1 to the vehicle side with a fixture such as a bolt and nut at predetermined positions. The case 10 has an opening surrounded by four side plates 10b and 10c at the lower end. Each battery cell is inserted and installed through the opening at the lower end with the electrode terminal at the top. A pair of side plate 10b is located in the both sides of the cell width direction W of a battery cell. The pair of side plates 10c are located at both ends in the stacking direction of the plurality of battery cells arranged in layers, that is, in the thickness direction T.

  The case 10 includes a plurality of storage chambers each storing battery cells. The case 10 is provided with storage chambers arranged in two rows in the cell width direction W. The battery cells accommodated in each of the plurality of accommodation chambers arranged in the cell thickness direction T on one side constitute the first stacked battery module 2, and another row of plural cells in the cell width direction W on the other side. The battery cells accommodated in the accommodation chamber constitute the second laminated battery module 3. As described above, each battery cell is accommodated in the accommodation chamber and held in the case 10, whereby the first laminated battery module 2 and the second laminated battery module 3 interpose the case 10 which is another member. Indirect contact with each other is integrally formed as a battery pack 1. In addition, the first laminated battery module 2 and the second laminated battery module 3 may be integrally formed as the assembled battery 1 in direct contact.

  An opening for arranging the bus bar at a predetermined position is formed in the lid 10a at the upper end of the case 10. In this opening, it arrange | positions so that the electrode terminal of the battery cell installed in each storage chamber may be exposed. The lid portion 10a is provided so as to insulate the bus bar and the battery cell outer case and cover, for example, the upper surface portion of the outer case excluding the safety valve and the electrode terminal.

  The lid portion 10a is provided with a smoke exhaust duct portion 4 that forms an internal passage so as to expose the safety valves of a plurality of battery cells. The duct portion 4 has heat resistance, and has a heat resistance capability in which the inside of the battery cell is in an abnormally high pressure state and the gas does not melt and break even if the internal gas is blown out due to the break of the safety valve. is there. Moreover, the cover part 10a has insulation, for example, is formed with synthetic resins, such as a polypropylene containing polypropylene and a filler and a talc.

  The upper surface of the battery cell from which the electrode terminal protrudes is in contact with the lid portion 10a. A seal member such as rubber may be disposed between the duct portion 4 of the lid portion 10a and the upper surface of the battery cell. Moreover, you may make it provide resin with high softness | flexibility, such as an elastomer, by two-color food molding etc. in the part which presses the upper surface of a battery cell in the duct part 4. FIG. The position of the electrode terminal with respect to the case 10 in the cell height direction H is defined by placing the upper surface of the battery cell in contact with the lid portion 10a. The battery cell is fixed to the case 10 with respect to the cell height direction H, the cell width direction W, and the cell thickness direction T by partially contacting the plate-like member of the case 10.

  The bus bar electrically connects electrode terminals that are different electrodes with respect to adjacent battery cells. The electrical connection between the bus bar and the electrode terminal is provided by fastening with bolts and nuts, or connection means such as laser welding or arc welding.

  A plurality of battery cells constituting one stacked battery module are connected in series by a corresponding number of bus bars so as to be energized. In other words, all the battery cells constituting one stacked battery module are electrically connected in series via each bus bar so that current flows from one side of the module toward the other side in plan view. .

  For the first laminated battery module 2, the positive terminal 20 a of the battery cell 20 located at one end of the module is connected to the bus bar 40, and the end of the bus bar 40 is the positive terminal as the total terminal part of the assembled battery 1. Corresponds to the side terminal. The negative electrode terminal 20b of the battery cell 20 is connected to the positive electrode terminal 21a of the adjacent battery cell 21 by the bus bar 41, and the battery cells stacked in the cell thickness direction T are connected in series by the bus bar. The battery cell 22 located at the other end of the first laminated battery module 2 has a positive electrode terminal 22a connected to a negative electrode terminal of a battery cell adjacent in the cell thickness direction T by a bus bar. Further, the negative electrode terminal 22 b of the battery cell 22 is connected to the positive electrode terminal 30 a of the battery cell 30 of the second stacked battery module 3 adjacent in the cell width direction W by the bus bar 42. The bus bar 42 directly connects the first laminated battery module 2 and the second laminated battery module adjacent to each other in the cell width direction W.

  Regarding the second laminated battery module 3, the negative electrode terminal 30 b of the battery cell 30 located at the other end of the module is connected to the positive electrode terminal 31 a of the battery cell 31 by the bus bar 43, and is further laminated in the cell thickness direction T. Each battery cell is connected in series by a bus bar. The negative electrode terminal 32b of the battery cell 32 located at the other end of the second stacked battery module 3 is connected to the bus bar 44, and the end of the bus bar 44 corresponds to the negative electrode side terminal as the total terminal portion of the assembled battery 1 as a whole. . The positive electrode terminal 20a forming one end of the series connection and the negative electrode terminal 32b forming the other end are arranged on the same side for both the stacked battery modules 2 and 3. The bus bars 40 and 44 arranged at both ends as total terminal portions of the entire assembled battery 1 are connected to a current control circuit using, for example, a relay in order to supply and discharge power.

  When the step of connecting the electrode terminals by the bus bar is performed, first, each battery cell is properly accommodated and held in a predetermined accommodation chamber with the electrode terminal leading from the lower end opening of the case 10. Next, predetermined bus bars respectively corresponding to the electrode terminals exposed from the opening of the lid 10a are installed on the assembly of the case 10 and the plurality of battery cells. In this state, a corresponding predetermined electrode terminal is inserted into the terminal insertion opening formed in each bus bar. Furthermore, for example, each bus bar and each electrode terminal are joined by welding such as fastening laser welding using a bolt and nut, arc welding, or the like.

  The current path in the assembled battery 1 is a U-turn from the positive terminal (positive terminal 20a) of the total terminal portion toward the negative terminal (negative terminal 32b) as shown by arrows in FIGS. It becomes the current line 100. In other words, the current line 100 includes a first current vector that is directed from one end side to the other end side of the assembled battery 1 and a first current vector that is opposite to the first current vector and directed from the other end side of the assembled battery 1 to the one end side. The two current vectors are continuous lines.

  The assembled battery 1 includes a plurality of voltage detection lines 50a, 51a, 52a, and 53a that are wired to transmit voltage signals between predetermined battery cells or between voltage cells. Each voltage detection line 50a-53a is a cable wired from the detection terminal connected to the predetermined position of a some battery cell. The plurality of voltage detection lines 50a to 53a are wired so as to extend in the cell thickness direction T after being drawn out from each detection terminal. A large number of voltage detection lines are communication lines extending from detection terminals that are fixed by caulking, welding, crimping, coupling by holding using a spring force, or the like to a part of the bus bar.

  The plurality of voltage detection lines 50a are bundled together in a cable harness 50 extending in the cell thickness direction T as a bundle, and reach the connector 5a disposed on the same side as the positive terminal as the total terminal portion. Each voltage detection line 50a includes a portion that is wired so as to extend in the cell width direction W perpendicular to the cell thickness direction T from the time when each voltage detection line 50a is bundled as a bundled cable harness 50. The cable harness 50 in which a plurality of voltage detection lines 50a are collected is wired along the side surface of the first stacked battery module 2 located on the opposite side to the second stacked battery module 3 in plan view. .

  A guide wall 50a1 is formed on the lid portion 10a along the side surface of the first laminated battery module 2 located on the opposite side to the second laminated battery module 3. The guide wall 50a1 is formed with a plurality of notches that open upward at a predetermined position in the cell thickness direction T. The notches correspond to a first wiring passage 50a2 through which the voltage detection line 50a passes. To do. Furthermore, the second wiring passage 50a3 extends in the cell thickness direction T along the guide wall 50a1. The cable harness 50 is a bundled line in which the voltage detection lines 50a led out from the first wiring paths 50a2 are gathered, and is arranged in the second wiring path 50a3.

  The plurality of voltage detection lines 51a are bundled together in a cable harness 51 extending in the cell thickness direction T as a bundle, and reach the connector 5a disposed on the same side as the positive terminal as the total terminal portion. Each voltage detection line 51a includes a portion wired so as to extend in the cell width direction W perpendicular to the cell thickness direction T from the time when each detection terminal is gathered as a bundled cable harness 51. The cable harness 51 in which the plurality of voltage detection lines 51a are collected is wired along the side surface of the first multilayer battery module 2 facing the second multilayer battery module 3 in plan view.

  The plurality of voltage detection lines 52a are bundled together in a cable harness 52 extending in the cell thickness direction T as a bundled line, and reach the connector 5b disposed on the same side as the negative terminal as the total terminal portion. Each voltage detection line 52a includes a portion wired so as to extend in the cell width direction W perpendicular to the cell thickness direction T from the time when each detection terminal is gathered as a bundled cable harness 52. The cable harness 52 in which the plurality of voltage detection lines 52a are collected is wired along the side surface of the second laminated battery module 3 facing the first laminated battery module 2 in plan view.

  A guide wall 51a1 and a guide wall 52a1 are formed along the side surface of the first stacked battery module 2 located on the side facing the second stacked battery module 3 in the lid portion 10a. The guide wall 51a1 is disposed closer to the first stacked battery module 2, and the guide wall 52a1 is disposed closer to the second stacked battery module 3. Both guide walls 51a1 and 52a1 are in a positional relationship facing each other with a space therebetween, and a passage extending in the cell thickness direction T formed therebetween is a second wiring passage 51a3 and a second wiring passage 52a3. It corresponds to. That is, the second wiring passage 51a3 and the second wiring passage 52a3 are the same passage.

  The guide wall 51a1 is formed with a plurality of notches that open upward at a predetermined position in the cell thickness direction T, and these notches correspond to a first wiring passage 51a2 through which the voltage detection line 51a passes. To do. The cable harness 51 is a bundled line in which the voltage detection lines 51a drawn from the first wiring paths 51a2 are gathered, and is arranged in the second wiring path 51a3.

  The guide wall 52a1 is formed with a plurality of notches that open upward at a predetermined position in the cell thickness direction T, and these notches correspond to the first wiring passage 52a2 through which the voltage detection line 52a passes. To do. The cable harness 52 is a bundled line in which the voltage detection lines 52a led out from the first wiring paths 52a2 are gathered, and is arranged in the second wiring path 52a3. That is, the cable harnesses 51 and 52 are wired together so as to vertically cross the central portion of the assembled battery 1 in the cell thickness direction T in a wiring passage formed between the guide wall 51a1 and the guide wall 52a1.

  The plurality of voltage detection lines 53a are bundled together in a cable harness 53 extending in the cell thickness direction T as a bundle, and reach the connector 5b disposed on the same side as the negative terminal as the total terminal portion. Each voltage detection line 53a includes a portion wired so as to extend in the cell width direction W perpendicular to the cell thickness direction T from the detection terminals to the bundled cable harness 53. The cable harness 53 in which the plurality of voltage detection lines 53a are collected is wired along the side surface of the second stacked battery module 3 located on the opposite side to the first stacked battery module 2 in plan view. .

  A guide wall 53a1 is formed on the lid portion 10a along the side surface of the second stacked battery module 3 located on the side opposite to the first stacked battery module 2. The guide wall 53a1 is formed with a plurality of notches that open upward at a predetermined position in the cell thickness direction T, and these notches correspond to the first wiring passage 53a2 through which the voltage detection line 53a passes. To do. Further, the second wiring passage 53a3 extends in the cell thickness direction T along the guide wall 53a1. The cable harness 53 is a bundled line in which the voltage detection lines 53a led out from the first wiring paths 53a2 are gathered, and is arranged in the second wiring path 53a3.

  The connectors 5a and 5b may be combined into one connector 5 as shown in FIGS. 2 and 3, and the connector 5 is connected to the control circuit of the battery monitoring device. That is, the voltage detection lines 50 a to 53 a are connected to the connector 5 by being combined into one cable harness at a place where the battery pack 1 is outside. Each of the cable harnesses 50 to 53 as a bundled wire includes a first current vector (a direction opposite to the cell thickness direction T in FIG. 1) and a second current vector (the cell thickness direction in FIG. 1) constituting the current line 100. Wired parallel to T). The height of each guide wall is higher than that of each cable harness, and has a function that protects the voltage detection line from contact with other components and external force acting from the outside and can be wired so as not to be damaged.

  The assembled battery 1 includes a plurality of temperature detection lines 60 and 61 wired to transmit temperature signals detected from detection terminals connected to predetermined positions of a plurality of battery cells. The plurality of temperature detection lines 60 are detection lines connected to the first stacked battery module 2 and are bundled together in a bundle extending in the cell thickness direction T, opposite to the positive terminal as the total terminal portion. Pulled out to the side. The bundle line in which the plurality of temperature detection lines 60 are collected is wired so as to extend along the cell thickness direction T between the electrode terminals of the battery cells constituting the first stacked battery module 2 in plan view. The temperature detection line is arranged in a different path from the voltage detection line in order to suppress the influence of noise of the voltage detection line.

  A guide wall 60a is formed on the lid portion 10a along a plurality of bus bars arranged in the cell thickness direction T on the side far from the second stacked battery module 3. The wiring passage 60a1 is formed between the guide wall 60a and the duct portion 4 so as to extend in the cell thickness direction T. A bundle of the temperature detection lines 60 is disposed in the wiring passage 60a1.

  The plurality of temperature detection lines 61 are detection lines connected to the second stacked battery module 3, and are bundled together in a bundle extending in the cell thickness direction T, opposite to the negative terminal as a total terminal portion. Pulled out to the side. The bundle line in which the plurality of temperature detection lines 61 are combined is wired so as to extend along the cell thickness direction T between the electrode terminals of the battery cells constituting the second stacked battery module 3 in a plan view.

  In the lid portion 10a, guide walls 61a are formed along a plurality of bus bars arranged in the cell thickness direction T on the side close to the second stacked battery module 3. The wiring passage 61a1 is formed between the guide wall 61a and the duct portion 4 so as to extend in the cell thickness direction T. The bundled wire in which the temperature detection lines 60 are gathered is disposed in the wiring passage 61a1. The temperature detection line 60 and the temperature detection line 61 are drawn to the opposite side with respect to both the stacked battery modules 2 and 3 from the side from which the voltage detection lines 50a to 53a are drawn. The plurality of temperature detection lines 60 and 61 are combined into a single cable harness and connected to the connector 6 at the place where the battery pack 1 is outside. The connector 6 is connected to the control circuit of the battery monitoring device.

  The assembled battery 1 may constitute a battery pack together with a current control device such as a relay, a battery monitoring device, a battery control device, a blower, and the like (not shown). The battery monitoring device is a battery ECU that monitors the state of the assembled battery 1. The battery monitoring device is connected to the assembled battery 1 via a plurality of detection lines extending from detection terminals installed at predetermined positions of the assembled battery 1 in order to detect information related to the state of the assembled battery 1. The detection lines are a voltage detection line connected to a detection terminal for detecting the voltage of the assembled battery 1, a temperature detection line connected to a detection terminal for detecting the battery temperature, and the like, and this information is transmitted to the battery monitoring device. The The battery pack includes electronic components that perform charging, discharging, battery temperature monitoring, battery cooling by a blower, and the like of a plurality of battery cells.

  Next, the effect which the assembled battery 1 of this embodiment brings is demonstrated. The assembled battery 1 includes a plurality of battery cells 20 to 22 and 30 to 32 each having electrode terminals, and a plurality of bus bars 40 to 43 that connect the electrode terminals so as to connect the plurality of battery cells in series. And a plurality of voltage detection lines 50a, 51a, 52a, 53a wired to transmit voltage signals detected from detection terminals connected to predetermined positions of the plurality of battery cells. The plurality of battery cells are formed by laminating a predetermined number of battery cells in the cell thickness direction T, and are arranged in two rows adjacent to the cell width direction W. The laminated battery module 3 is formed. All the battery cells constituting the stacked battery modules 2 and 3 arranged adjacent to each other in two rows are connected in series. The electrode terminal (positive electrode terminal 20a) forming one end of the series connection and the electrode terminal (negative electrode terminal 32b) forming the other end are arranged on the same side of the stacked battery modules 2 and 3. The cable harnesses 50, 51, 52, 53 of the voltage detection lines are routed so as to extend in the cell thickness direction T after being pulled out from the respective detection terminals.

  According to this configuration, the assembled battery 1 is formed by arranging the electrode terminals (the positive terminal 20a and the negative terminal 32b) forming both ends of the series connection in the two rows of the stacked battery modules 2 and 3 in the cell width direction W on the same side. A current line 100 indicating a current path in FIG. 9 describes a U-turn form from the negative terminal of the total terminal portion to the positive terminal. In this U-turn-shaped current line 100, two rows of stacked battery modules 2 and 3 are arranged adjacent to each other, so that a first current vector (FIG. 1) is directed from one end side of the total terminal portion to the other end side of the assembled battery 1. And a second current vector (cell of FIG. 1) that is folded back at the battery cells 22 and 30 located on the other end side of the assembled battery 1 and is opposite to the first current vector. Thickness direction T).

  In the assembled battery 1, since the two rows of stacked battery modules 2 and 3 are adjacently arranged, the first current vector and the second current vector are adjacent to each other in opposite directions. Since the magnetic fields generated by the respective current vectors cancel each other, the strength of the magnetic field generated by the current flowing through the assembled battery 1 is consequently converted into a conventional technology that forms a unidirectional current line (Japanese Patent Laid-Open No. 2011-34883). As compared with the above, it can be greatly reduced. As described above, even when the cable harness of the voltage detection line is wired in parallel with the current vector, the influence of the magnetic field on the voltage detection line can be reduced. Therefore, the absolute amount of noise to the voltage detection line can be suppressed, and highly accurate voltage detection can be realized in the assembled battery 1.

  Moreover, according to the assembled battery 1, since the electrode terminal which makes the both ends of a serial connection is arrange | positioned on the same side about each laminated battery module 2 and 3, the various connection between both modules can be simplified, The simplification can reduce the number of parts.

  In the assembled battery 1, as shown in FIGS. 2 and 3, the first stacked battery module 2 and the second stacked battery module 3 are indirectly connected via other members such as a case 10 that houses each battery cell. In contact with each other and formed integrally. Alternatively, the first laminated battery module 2 and the second laminated battery module 3 may be directly formed so as to be integrally formed.

  According to this configuration, since the distance between the modules in two rows is reduced, the first current vector and the second current vector can be brought close to each other. That is, in the current line 100 that forms a U-shape, the forward path and the backward path in which the directions of the currents are opposite approach each other. Thereby, the cancellation of the magnetic field between both current vectors is strengthened, and the strength of the magnetic field that can be generated by the current can be further reduced. Therefore, the absolute amount of noise to the voltage detection line can be further suppressed.

  Each of the cable harnesses 50, 51, 52, 53 including the plurality of voltage detection lines 50a, 51a, 52a, 53a has a positive terminal 20a and a negative terminal 32b that form both ends of the series connection in the laminated battery modules 2, 3. It is pulled out to the side where it is placed.

  According to this configuration, the lead-out side of the voltage detection line and the electrode terminals forming both ends in the assembled battery 1 are collected on the same side. Thereby, in a battery pack including a battery monitoring device that detects voltage, a control device that controls charging / discharging, etc., it is possible to reduce the number of parts related to various connections and shorten the wiring. Therefore, the battery pack component management can be simplified and the cost can be reduced.

  As shown in FIGS. 2 and 3, the plurality of temperature detection lines 60 and 61 are the sides from which the cable harnesses 50, 51, 52 and 53 including the voltage detection lines 50 a, 51 a, 52 a and 53 a are drawn out. The stacked battery modules 2 and 3 are drawn to the opposite side.

  Since the temperature detection line is a low voltage line compared to the voltage detection line or the like, it is easily affected by the magnetic field from the high voltage line. Therefore, according to this configuration, by disposing the temperature detection line away from the high voltage current path and the voltage detection line, it is possible to reduce the influence of noise from the high voltage line on the temperature detection lines 60 and 61. Therefore, the accuracy of temperature detection in the assembled battery 1 can be increased, and appropriate battery monitoring can be realized.

(Second Embodiment)
In the second embodiment, an assembled battery 1 </ b> A that is another form of the first embodiment will be described with reference to FIGS. 4 to 6. Components having the same reference numerals as those in the drawings according to the first embodiment and other configurations not described in the second embodiment are the same as those in the first embodiment and have the same effects.

  As shown in FIGS. 4 to 6, the assembled battery 1 </ b> A differs from the assembled battery 1 in the configuration of the voltage detection line. The plurality of voltage detection lines 50a to 53a are wired as bundled wires that are grouped together in each stacked battery module unit. The plurality of voltage detection lines 50a to 53a include a portion wired so as to extend in the cell width direction W perpendicular to the cell thickness direction T from the time when each of the detection terminals is gathered as a bundle line. Each of the bundled wires is wired so as to extend in the cell thickness direction T.

  A cable harness 50 in which a plurality of voltage detection lines 50a are combined and a cable harness 51 in which a plurality of voltage detection lines 51a are combined are bundled together as a cable harness 50A in units of the first stacked battery module 2. Wired. The cable harnesses 50 and 51 are arranged close to each other in the module. Further, the cable harness 52 in which the plurality of voltage detection lines 52a are combined and the cable harness 53 in which the plurality of voltage detection lines 53a are combined are bundled together in the unit of the second stacked battery module 3 as the cable harness 52A. Wired as The cable harnesses 52 and 53 are arranged close to each other in the module. The cable harness 50 is wired so as to extend along the cell thickness direction T between the electrode terminals of the battery cells constituting the first laminated battery module 2 in plan view.

  A guide wall 50aa along a plurality of bus bars arranged in the cell thickness direction T on the side far from the second stacked battery module 3 is formed on the lid 10a. The guide wall 50aa is formed with a plurality of notches that open upward at a predetermined position in the cell thickness direction T, and these notches correspond to the first wiring passage 50aa2 through which the voltage detection line 50a passes. To do. The second wiring passage 50aa1 is formed between the guide wall 50aa and the duct portion 4 so as to extend in the cell thickness direction T. The cable harness 50 is disposed in the second wiring passage 50aa1 so as to run in parallel with the duct portion 4 and the cable harness 51.

  On the lid portion 10a, guide walls 51aa are formed along a plurality of bus bars arranged in the cell thickness direction T on the side close to the second stacked battery module 3. The guide wall 51aa is formed with a plurality of notches that open upward at a predetermined position in the cell thickness direction T, and the notches correspond to the first wiring passage 51aa2 through which the voltage detection line 51a passes. To do. The second wiring passage 51aa1 is formed between the guide wall 51aa and the duct portion 4 so as to extend in the cell thickness direction T. The cable harness 51 is disposed in the second wiring passage 51aa1 so as to run in parallel with the duct portion 4 and the cable harness 50.

  On the lid portion 10a, guide walls 52aa are formed along a plurality of bus bars arranged in the cell thickness direction T on the side close to the first stacked battery module 2. The guide wall 52aa is formed with a plurality of notches that open upward at a predetermined position in the cell thickness direction T, and these notches correspond to the first wiring passage 52aa2 through which the voltage detection line 52a passes. To do. The second wiring passage 52aa1 is formed between the guide wall 52aa and the duct portion 4 so as to extend in the cell thickness direction T. The cable harness 52 is disposed in the second wiring passage 52aa1 so as to run in parallel with the duct portion 4 and the cable harness 53.

  A guide wall 53aa along a plurality of bus bars arranged in the cell thickness direction T on the side far from the first stacked battery module 2 is formed on the lid 10a. The guide wall 53aa is formed with a plurality of notches that open upward at a predetermined position in the cell thickness direction T, and these notches correspond to the first wiring passage 53aa2 through which the voltage detection line 53a passes. To do. The second wiring passage 53aa1 is formed between the guide wall 53aa and the duct portion 4 so as to extend in the cell thickness direction T. The cable harness 53 is disposed in the second wiring passage 53aa1 so as to run in parallel with the duct portion 4 and the cable harness 52.

  As shown in FIG.5 and FIG.6, the temperature detection lines 60 and 61 are arrange | positioned at the both ends of the cell width direction W of 1 A of assembled batteries, and are arrange | positioned in the position different from the voltage detection lines 50a-53a.

  Next, the effect which the assembled battery 1A of this embodiment brings is demonstrated. In the assembled battery 1 </ b> A, the plurality of voltage detection lines 50 a and 51 a are wired as a cable harness 50 </ b> A that is bundled in a bundle for each stacked battery module. Further, the plurality of voltage detection lines include a portion wired so as to extend in the cell width direction W perpendicular to the cell thickness direction T from the time when each of the detection terminals is gathered into a bundle line. The cable harness 50A is wired so as to extend in the cell thickness direction T. Further, the voltage detection lines 50a and 51a are arranged close to each other on the module. This configuration is the same for the cable harness 52A.

  According to this configuration, a plurality of voltage detection lines are arranged close to each other on the module, and a plurality of voltage detection lines 50a, 50a included in one row of modules are obtained by collecting the voltage detection lines as bundles in units of each stacked battery module. 51a is affected by equivalent noise. For this reason, the influence of the noise which each voltage detection line for 1 row of modules receives can be match | combined with an equivalent level. Therefore, it is not necessary to consider the influence of noise between the voltage detection values of each voltage detection line. Thus, the difference in the influence of noise is eliminated, which can contribute to highly accurate voltage detection.

(Third embodiment)
In 3rd Embodiment, the assembled battery 1B which is another form with respect to 1st Embodiment is demonstrated with reference to FIGS. Components having the same reference numerals as those in the drawing according to the first embodiment, and other configurations not described in the third embodiment are the same as those in the first embodiment, and have the same effects.

  As shown in FIGS. 7 to 9, the assembled battery 1 </ b> B is different from the assembled battery 1 in the configuration of the voltage detection line. All of the voltage detection lines 50a to 53a attached to the assembled battery 1B are collected and wired as a bundled cable harness 50B. The cable harness 50 </ b> B is wired so as to extend in the cell thickness direction T between the adjacent first stacked battery module 2 and second stacked battery module 3. That is, the plurality of voltage detection lines 50a to 53a are assembled and wired as a single bundle on the way. Each of the voltage detection lines 50a to 53a extends in the cell width direction W perpendicular to the cell thickness direction T until the voltage detection lines 50a to 53a are bundled as bundles at the center of the battery pack 1 in the cell width direction W. The part to be wired is included.

  The cable harness 50B is arranged in a second wiring path 51a3 (or second wiring path 52a3) provided between the first stacked battery module 2 and the second stacked battery module 3 in plan view.

  Next, the effect which the assembled battery 1B of this embodiment brings is demonstrated. In the assembled battery 1B, all of the plurality of voltage detection lines 50a, 51a, 52a, 53a are wired as a cable harness 50B that is a bundled line. The cable harness 50 </ b> B is wired so as to extend in the cell thickness direction T between the adjacent stacked battery modules 2 and 3.

  Here, since the region between the adjacent first laminated battery module 2 and the second laminated battery module 3 is located in the middle of the U-turn current line 100, it is not easily affected by the magnetic field due to the current. Is a place. Therefore, according to this configuration, the absolute amount of noise to each voltage detection line can be further suppressed by arranging the bundle of voltage detection lines in a place that is not easily affected by the magnetic field.

(Fourth embodiment)
In the fourth embodiment, an assembled battery 1 </ b> C that is another form of the first embodiment will be described with reference to FIG. 10. Components having the same reference numerals as those in the drawings according to the first embodiment and other configurations not described in the fourth embodiment are the same as those in the first embodiment, and have the same effects.

  As shown in FIG. 10, in the assembled battery 1C, the plurality of voltage detection lines 50a to 53a are both on the side where the electrode terminals (the positive terminal 20a and the negative terminal 32b) forming both ends of the series connection are arranged. The stacked battery modules 2 and 3 are characterized by being drawn out to the opposite side. That is, the connector 5 a and the connector 5 b are on the side where the bus bar 42 that connects the battery cell 22 on the other end of the first laminated battery module 2 and the battery cell 30 on the other end of the second laminated battery module 3 is located, that is, It is pulled out to the opposite side of the assembled battery 1 and connected to the control circuit of the battery monitoring device. Further, the cable harnesses 50 to 53 as bundled wires are wired so as to be parallel to the first current vector and the second current vector constituting the current line 100.

  According to the assembled battery 1 </ b> C of the fourth embodiment, the plurality of voltage detection lines 50 a to 53 a are different from the side where the positive electrode terminal 20 a and the negative electrode terminal 32 b forming both ends of the series connection are arranged in the stacked battery modules 2 and 3. Is pulled out to the other side. According to this configuration, the start point and end point of the U-turn current line 100 and the lead-out side of the plurality of voltage detection lines 50a to 53a are arranged apart from each other. Further, since the voltage detection lines 50a to 53a can be arranged apart from the current wiring connected to the electrode terminals 20a and 32b and connected to other modules or current control devices, noise applied to the voltage detection lines Therefore, it is possible to detect the voltage with high accuracy.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. The structure of the said embodiment is an illustration to the last, Comprising: The scope of the present invention is not limited to the range of these description. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  The configuration related to the wiring of the voltage detection line and the temperature detection line according to the present invention is not limited to the configuration described in the above embodiment. Each structure in said assembled battery 1,1A, 1B, 1C is only one embodiment to the last. Based on the description of the scope of claims, the configuration relating to the wiring of the voltage detection line and the temperature detection line is not limited as long as it falls within the scope of the right.

  In the said embodiment, the number of the battery cells which comprise assembled battery 1,1A, 1B, 1C is only an example. The above embodiment is only an example for the installation locations of the voltage detection lines and the temperature detection lines. Based on the description of the scope of claims, the installation location is not limited as long as it is within the scope of the right.

DESCRIPTION OF SYMBOLS 1 ... Battery pack 2 ... 1st laminated battery module (laminated battery module)
3 ... 2nd laminated battery module (laminated battery module)
20, 21, 22, 30, 31, 32 ... battery cells 20a, 21a, 22a, 30a, 31a ... positive terminals (electrode terminals)
20b, 21b, 22b, 30b, 32b ... Negative terminal (electrode terminal)
40, 41, 42, 43 ... bus bar 50A, 52A ... cable harness (voltage detection wire, bundled wire)
50a, 51a, 52a, 53a ... Voltage detection line T ... Cell thickness direction W ... Cell width direction

Claims (3)

  1. A plurality of battery cells (20-22, 30-32) each having an electrode terminal (20a-22a, 30a-32a) composed of a positive electrode terminal and a negative electrode terminal protruding from the outer case;
    A plurality of bus bars (40 to 43) for connecting the electrode terminals so as to connect the plurality of battery cells in series;
    A plurality of voltage detection lines (50a, 51a, 52a, 53a) wired to transmit voltage signals detected from detection terminals connected to predetermined positions of the plurality of battery cells,
    The plurality of battery cells are formed by laminating a predetermined number of battery cells in the cell thickness direction (T), and are arranged in two rows adjacent to the cell width direction (W). (2) and a second laminated battery module (3) are formed,
    All the battery cells constituting the laminated battery module (2, 3) disposed adjacent to the two rows, are series-connected,
    The electrode terminal (20a) forming one end of the series connection and the electrode terminal (32b) forming the other end are disposed on the same side of the stacked battery module,
    The plurality of voltage detection lines connected to the first stacked battery module and the second stacked battery module are drawn out from the respective detection terminals, and then combined into a single bundle (50B). The one bundle wire (50B) is wired so as to extend in the cell thickness direction between the adjacent stacked battery modules (2, 3),
    On both sides of the one bundle wire, directions of currents flowing through the first stacked battery module and the second stacked battery module are opposite to each other along the cell thickness direction. The assembled battery.
  2.   The voltage detection lines (50a, 51a, 52a, 53a) are drawn out to the side where the electrode terminals (20a, 32b) forming both ends of the series connection are arranged in the multilayer battery module (2, 3). The assembled battery according to claim 1.
  3. A plurality of temperature detection lines (60, 61) wired to transmit temperature signals detected from detection terminals connected to predetermined positions of the plurality of battery cells;
    3. The assembled battery according to claim 2, wherein the temperature detection line is drawn to the opposite side with respect to the stacked battery module (2, 3) from the side from which the electrode terminal and the voltage detection line are drawn.
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JP5630431B2 (en) * 2011-12-13 2014-11-26 株式会社デンソー Assembled battery
JP6338905B2 (en) * 2014-03-25 2018-06-06 三洋電機株式会社 Battery system
JP6241671B2 (en) 2014-11-25 2017-12-06 株式会社オートネットワーク技術研究所 Mounting structure of temperature detection member to bus bar and wiring module
JP6363645B2 (en) * 2016-03-09 2018-07-25 株式会社東芝 Battery module, battery, storage battery, and electrical device
JP6597440B2 (en) * 2016-03-25 2019-10-30 トヨタ自動車株式会社 Battery pack
JP6745036B2 (en) * 2016-07-26 2020-08-26 株式会社オートネットワーク技術研究所 Battery wiring module

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JP2011049155A (en) * 2009-07-30 2011-03-10 Sanyo Electric Co Ltd Battery system and electric vehicle including the same
JP5457115B2 (en) * 2009-09-15 2014-04-02 矢崎総業株式会社 Battery assembly attachment
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