CA2840575C - Battery pack - Google Patents
Battery pack Download PDFInfo
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- CA2840575C CA2840575C CA2840575A CA2840575A CA2840575C CA 2840575 C CA2840575 C CA 2840575C CA 2840575 A CA2840575 A CA 2840575A CA 2840575 A CA2840575 A CA 2840575A CA 2840575 C CA2840575 C CA 2840575C
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- Prior art keywords
- battery
- main circuit
- terminal
- total
- circuit terminal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/507—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
- H01M50/51—Connection only in series
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Battery Mounting, Suspending (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
A battery pack includes a battery assembly having a plurality of battery cells, a busbar module that includes a plurality of conductors and an insulating member which holds the conductors, a battery control unit provided at an end portion of the battery assembly in an arrangement direction of the battery cells, and an extraction conductor that connects a total electrode terminal connected to the battery assembly to a main circuit terminal of the battery control unit. The extraction conductor has a water escape portion which is located below an imaginary line connecting the total electrode terminal to the main circuit terminal, and an upper end of the water escape portion is formed at a location that is lower than a lower end of the main circuit terminal.
Description
DESCRIPTION
BATTERY PACK
Technical Field The present disclosure relates to a battery pack, for instance, a battery pack used as a DC power source for driving an electric motor in an electric vehicle and a hybrid electric vehicle.
Background Art As described in connection with Patent Literature (PTL) 1, a battery pack of this type has a battery assembly in which a plurality of battery cells are arranged in such a manner that positive electrodes and negative electrodes of the battery cells adjoin each other and serially interconnecting and bundling the positive electrodes and the negative electrodes of the adjoining battery cells by conductors referred to as busbars. The battery assembly is used while being contained in a housing as necessary. A positive electrode (hereinafter called a "total positive electrode") and a negative electrode (hereinafter called a "total negative electrode") of battery cells at both ends of the battery assembly work as DC outputs of the battery pack.
In a battery pack, a battery control unit for controlling the battery assembly is sometimes provided at end portion of the battery assembly in a direction where the battery cells are aligned. The battery control unit has, for instance, a current sensor for detecting an electric current output from a battery pack, a precharge contactor, a main contactor, and others. The battery control unit is used while the total electrode terminals, or the total positive terminal and the total negative terminal of the battery assembly, are connected to a controller of a load by way of the battery control unit.
Citation List Patent Literature [PTL 1] JP-A-2009-289431 Summary of Invention Technical Problem However, according to PTL 1, the total electrode terminals are positioned on an upper surface of the battery assembly, and a main circuit terminal pulled out of an interior of the battery control unit are positioned so as to be flush with the total electrode terminals. The total electrode terminals and the main circuit terminal are connected together by a linear extraction conductor having a linear shape. Therefore, there is a potential of a fluid, such as water, intruding into the battery control unit while running along the linear extrusion conductors. Specifically, there arises a problem, such as that will be described below. For instance, if a liquid, like water, that has condensed from moisture in the atmosphere for reasons of day-night air temperature difference within the busbar module containing a conductor of the battery main circuit intrudes into the battery control unit while running along the extraction conductor, the liquid will cause a failure.
BATTERY PACK
Technical Field The present disclosure relates to a battery pack, for instance, a battery pack used as a DC power source for driving an electric motor in an electric vehicle and a hybrid electric vehicle.
Background Art As described in connection with Patent Literature (PTL) 1, a battery pack of this type has a battery assembly in which a plurality of battery cells are arranged in such a manner that positive electrodes and negative electrodes of the battery cells adjoin each other and serially interconnecting and bundling the positive electrodes and the negative electrodes of the adjoining battery cells by conductors referred to as busbars. The battery assembly is used while being contained in a housing as necessary. A positive electrode (hereinafter called a "total positive electrode") and a negative electrode (hereinafter called a "total negative electrode") of battery cells at both ends of the battery assembly work as DC outputs of the battery pack.
In a battery pack, a battery control unit for controlling the battery assembly is sometimes provided at end portion of the battery assembly in a direction where the battery cells are aligned. The battery control unit has, for instance, a current sensor for detecting an electric current output from a battery pack, a precharge contactor, a main contactor, and others. The battery control unit is used while the total electrode terminals, or the total positive terminal and the total negative terminal of the battery assembly, are connected to a controller of a load by way of the battery control unit.
Citation List Patent Literature [PTL 1] JP-A-2009-289431 Summary of Invention Technical Problem However, according to PTL 1, the total electrode terminals are positioned on an upper surface of the battery assembly, and a main circuit terminal pulled out of an interior of the battery control unit are positioned so as to be flush with the total electrode terminals. The total electrode terminals and the main circuit terminal are connected together by a linear extraction conductor having a linear shape. Therefore, there is a potential of a fluid, such as water, intruding into the battery control unit while running along the linear extrusion conductors. Specifically, there arises a problem, such as that will be described below. For instance, if a liquid, like water, that has condensed from moisture in the atmosphere for reasons of day-night air temperature difference within the busbar module containing a conductor of the battery main circuit intrudes into the battery control unit while running along the extraction conductor, the liquid will cause a failure.
2 A problem that the present disclosure is to solve is to prevent a liquid, like water, from intruding into a battery control unit while running along an extraction conductor connected to a battery main circuit.
Solution to Problem In order to solve the problem, the present disclosure provides a battery pack including a battery assembly that includes a plurality of battery cells which are arranged while positive electrodes and negative electrodes of the battery cells are alternately adjoined each other; a busbar module that includes a plurality of conductors and an insulating member which holds the conductors, each of the conductor interconnecting the positive electrode and the negative electrode of each of the adjoining battery cells in the battery assembly; a battery control unit provided at an end portion of the battery assembly in a direction in which the battery cells are arranged; and an extraction conductor that connects a total electrode terminal connected to a total positive electrode or a total negative electrode of the battery assembly to a main circuit terminal of the battery control unit, wherein the extraction conductor has a water escape portion which is located below an imaginary line connecting the total electrode terminal to the main circuit terminal, and an upper end of the water escape portion is formed at a location that is lower than a lower end of the main circuit terminal.
Since the present disclosure is configured as mentioned above, a fluid running along the extraction conductor, like water, falls down to the water escape portion by gravitation. However, the upper end of the water escape
Solution to Problem In order to solve the problem, the present disclosure provides a battery pack including a battery assembly that includes a plurality of battery cells which are arranged while positive electrodes and negative electrodes of the battery cells are alternately adjoined each other; a busbar module that includes a plurality of conductors and an insulating member which holds the conductors, each of the conductor interconnecting the positive electrode and the negative electrode of each of the adjoining battery cells in the battery assembly; a battery control unit provided at an end portion of the battery assembly in a direction in which the battery cells are arranged; and an extraction conductor that connects a total electrode terminal connected to a total positive electrode or a total negative electrode of the battery assembly to a main circuit terminal of the battery control unit, wherein the extraction conductor has a water escape portion which is located below an imaginary line connecting the total electrode terminal to the main circuit terminal, and an upper end of the water escape portion is formed at a location that is lower than a lower end of the main circuit terminal.
Since the present disclosure is configured as mentioned above, a fluid running along the extraction conductor, like water, falls down to the water escape portion by gravitation. However, the upper end of the water escape
3 portion is situated below the lower end of the main circuit terminal, the fluid will not rise upwardly against gravity from the water escape portion toward the main circuit terminal of the battery control unit. As a consequence, the fluid running along the extraction conductor of the battery main circuit, like water, flows to a position that is lower than the main circuit terminal of the battery control unit, by virtue of the water escape portion of the extraction conductor. Hence, the fluid can be prevented from intruding into the battery control unit along the extraction conductor.
In the present disclosure, for example, the extraction conductor has a first cutout portion which is located between the total electrode terminal and the main circuit terminal, the water escape portion has a second cutout portion so that the water escape portion is shaped in U shape, the second cutout portion being communicated with the first cut out portion, and a bottom of the second cutout portion is formed at a position lower than the lower end of the main circuit terminal.
Also, for example, the total electrode terminal and the main circuit terminal are formed respectively on a side surface of the battery assembly and a side surface of the battery control unit on the same side.
Also, for example, both ends of the extraction conductor are fastened respectively to the total electrode terminal and the main circuit terminal with a bolt or a nut.
Also, for example, the extraction conductor is contained in a resin case, and an opening is formed in a bottom surface of the case. By this configuration, the liquid flowing downwardly after running along the extraction
In the present disclosure, for example, the extraction conductor has a first cutout portion which is located between the total electrode terminal and the main circuit terminal, the water escape portion has a second cutout portion so that the water escape portion is shaped in U shape, the second cutout portion being communicated with the first cut out portion, and a bottom of the second cutout portion is formed at a position lower than the lower end of the main circuit terminal.
Also, for example, the total electrode terminal and the main circuit terminal are formed respectively on a side surface of the battery assembly and a side surface of the battery control unit on the same side.
Also, for example, both ends of the extraction conductor are fastened respectively to the total electrode terminal and the main circuit terminal with a bolt or a nut.
Also, for example, the extraction conductor is contained in a resin case, and an opening is formed in a bottom surface of the case. By this configuration, the liquid flowing downwardly after running along the extraction
4 conductor can be discharged outside of the case.
Furthermore, for example, the resin case has a rib to be held in the first cutout portion of the water escape portion.
Advantageous Effects of Invention The present disclosure makes it possible to prevent a liquid, like water, from intruding into a battery control unit while running along an extraction conductor connected to a battery main circuit.
Brief Description of Drawings Fig. 1 is a view showing a configuration of an extraction conductor that connects a total electrode terminal with a main circuit terminal of a battery control unit in a battery pack according to an embodiment of the present disclosure;
Fig. 2 is a perspective view of a principal block of the battery pack shown in Fig. 1 according to the embodiment; and Fig. 3 is a perspective external view of the entirety of the battery pack shown in Fig. 1 according to the embodiment.
Description of Embodiments Fig.,3 shows a perspective structural view of a battery pack 1 of according to an embodiment of the present disclosure. The battery pack 1, for instance, is used as a DC power supply for activating an electric motor of an electric vehicle. As illustrated, a plurality of thinly-formed battery cells 2, like
Furthermore, for example, the resin case has a rib to be held in the first cutout portion of the water escape portion.
Advantageous Effects of Invention The present disclosure makes it possible to prevent a liquid, like water, from intruding into a battery control unit while running along an extraction conductor connected to a battery main circuit.
Brief Description of Drawings Fig. 1 is a view showing a configuration of an extraction conductor that connects a total electrode terminal with a main circuit terminal of a battery control unit in a battery pack according to an embodiment of the present disclosure;
Fig. 2 is a perspective view of a principal block of the battery pack shown in Fig. 1 according to the embodiment; and Fig. 3 is a perspective external view of the entirety of the battery pack shown in Fig. 1 according to the embodiment.
Description of Embodiments Fig.,3 shows a perspective structural view of a battery pack 1 of according to an embodiment of the present disclosure. The battery pack 1, for instance, is used as a DC power supply for activating an electric motor of an electric vehicle. As illustrated, a plurality of thinly-formed battery cells 2, like
5
6 lithium batteries, are arranged as a battery assembly 3. The plurality of battery cells 2 are alternately arranged in such a manner that positive electrodes and negative electrodes of the battery cells are adjoined each other. The positive electrodes and the negative electrodes of the adjoining battery cells 2 are connected in series by respective conductors 4 referred to as busbars. The number of serially-connected battery cells 2 of the battery assembly 3 is determined according to a desired DC voltage. The positive electrode (hereinafter called a "total positive electrode") and the negative electrode (hereinafter called a "total negative electrode") of the battery cells 2 disposed at both ends of the battery assembly 3 work as DC outputs of the battery pack 1.
When the number of serially-connected battery cells 2 is an odd number, the total positive electrode and the total negative electrode are situated at respective opposite sides of the battery assembly 3. By contrast, when the number of serially-connected battery cells is an even number, the total positive electrode and the total negative electrode are situated at the same side of the battery assembly 3. The present embodiment is an example in which the number of battery cells connected in series is an odd number.
The plurality of conductors 4 that interconnect the adjoining positive and negative electrodes of the plurality of battery cells 2 are placed within a case formed from a resin member, or an insulating member, and that is formed as a busbar module 5. Although unillustrated by the drawing, a columnar positive terminal or a columnar negative terminal projecting from a side surface of the battery cell is connected to the positive or negative electrode of each of the battery cells 2 in the present embodiment, and a screw thread is formed on an exterior surface of each of the columnar electrode terminals. A pair of holes are drilled in each of the conductors 4 in alignment with positions of the positive electrode terminal and the negative electrode terminal of the adjoining battery cells 2. The respective electrode terminals are inserted into the corresponding holes of the conductor 4, and nuts are screw-engaged with the respective screw threads of the respective electrode terminals, whereby the conductor 4 is fastened to the respective electrode terminals. Incidentally, the columnar electrode terminals of the total positive electrodes or the total negative electrodes of the battery cells 2 situated at both ends of the battery assembly 3 are not connected to the electrode terminals of the adjoining battery cells 2 and pulled outside by means of an extraction conductor.
In the meantime, the battery pack 1 is equipped with a battery control unit 6 that is intended for controlling the battery assembly 3 and that is positioned at an end of the battery assembly 3 along a direction in which the battery cells 2 are arranged. Although unillustrated, the battery control unit 6 is formed from pieces of control equipment housed in a plastic case, for instance, a current sensor for detecting an electric current output from the battery pack 1, a main contactor for turning on/off an output from the battery pack 1, a precharge contactor for turning on the output from the battery pack 1 for a given period of time before turning on the main contactor; and the like. In the present embodiment, the battery control unit 6 is fastened to the total-negative-electrode-side battery cell 2 at the end of the battery assembly 3 with an end plate 7 sandwiched therebetween. The end plate 7 is a member that is situated at either end of the battery assembly 3 in order to bundle the
When the number of serially-connected battery cells 2 is an odd number, the total positive electrode and the total negative electrode are situated at respective opposite sides of the battery assembly 3. By contrast, when the number of serially-connected battery cells is an even number, the total positive electrode and the total negative electrode are situated at the same side of the battery assembly 3. The present embodiment is an example in which the number of battery cells connected in series is an odd number.
The plurality of conductors 4 that interconnect the adjoining positive and negative electrodes of the plurality of battery cells 2 are placed within a case formed from a resin member, or an insulating member, and that is formed as a busbar module 5. Although unillustrated by the drawing, a columnar positive terminal or a columnar negative terminal projecting from a side surface of the battery cell is connected to the positive or negative electrode of each of the battery cells 2 in the present embodiment, and a screw thread is formed on an exterior surface of each of the columnar electrode terminals. A pair of holes are drilled in each of the conductors 4 in alignment with positions of the positive electrode terminal and the negative electrode terminal of the adjoining battery cells 2. The respective electrode terminals are inserted into the corresponding holes of the conductor 4, and nuts are screw-engaged with the respective screw threads of the respective electrode terminals, whereby the conductor 4 is fastened to the respective electrode terminals. Incidentally, the columnar electrode terminals of the total positive electrodes or the total negative electrodes of the battery cells 2 situated at both ends of the battery assembly 3 are not connected to the electrode terminals of the adjoining battery cells 2 and pulled outside by means of an extraction conductor.
In the meantime, the battery pack 1 is equipped with a battery control unit 6 that is intended for controlling the battery assembly 3 and that is positioned at an end of the battery assembly 3 along a direction in which the battery cells 2 are arranged. Although unillustrated, the battery control unit 6 is formed from pieces of control equipment housed in a plastic case, for instance, a current sensor for detecting an electric current output from the battery pack 1, a main contactor for turning on/off an output from the battery pack 1, a precharge contactor for turning on the output from the battery pack 1 for a given period of time before turning on the main contactor; and the like. In the present embodiment, the battery control unit 6 is fastened to the total-negative-electrode-side battery cell 2 at the end of the battery assembly 3 with an end plate 7 sandwiched therebetween. The end plate 7 is a member that is situated at either end of the battery assembly 3 in order to bundle the
7 plurality of arranged battery cells 2. Although unillustrated, the battery assembly 3 may be contained in a housing, if needed.
By reference to Fig. 1 and Fig. 2, there is described a configuration of the extraction conductor, which is a characteristic part of the above-configured battery pack 1 of the present embodiment, for connecting the total negative electrode terminal to the main circuit terminal 12 of the battery control unit 6.
Fig. 1 is a front view showing a surface of an end portion on which a total negative electrode terminal 11 is formed, where the battery control unit 6 is positioned, of the battery assembly 3 shown in Fig. 3. As illustrated, in the present embodiment, the total negative electrode terminal 11 connected to a total negative electrode is connected to one main circuit terminal 12 provided on the side surface of the battery control unit 6 by way of an extraction conductor 13. In addition, an unillustrated total positive electrode terminal is connected to the other main circuit terminal 17 of the battery control unit 6 by way of a cable.
The side surface of the battery assembly 3 where the total negative electrode terminal 11 is formed and the side surface of the battery control unit 6 are placed so as to become flush with each other. The total negative electrode terminal 11 connected to the total negative electrode of the battery assembly corresponds to a columnar body whose outer periphery is threaded and that is provided so as to project from a side surface of the battery cell 2. In addition, the main circuit terminal 12 of the battery control unit 6 is provided so as to project from the side surface of the battery control unit 6, and a screw hole is drilled in a leading-end face of the main circuit terminal 12. The total negative
By reference to Fig. 1 and Fig. 2, there is described a configuration of the extraction conductor, which is a characteristic part of the above-configured battery pack 1 of the present embodiment, for connecting the total negative electrode terminal to the main circuit terminal 12 of the battery control unit 6.
Fig. 1 is a front view showing a surface of an end portion on which a total negative electrode terminal 11 is formed, where the battery control unit 6 is positioned, of the battery assembly 3 shown in Fig. 3. As illustrated, in the present embodiment, the total negative electrode terminal 11 connected to a total negative electrode is connected to one main circuit terminal 12 provided on the side surface of the battery control unit 6 by way of an extraction conductor 13. In addition, an unillustrated total positive electrode terminal is connected to the other main circuit terminal 17 of the battery control unit 6 by way of a cable.
The side surface of the battery assembly 3 where the total negative electrode terminal 11 is formed and the side surface of the battery control unit 6 are placed so as to become flush with each other. The total negative electrode terminal 11 connected to the total negative electrode of the battery assembly corresponds to a columnar body whose outer periphery is threaded and that is provided so as to project from a side surface of the battery cell 2. In addition, the main circuit terminal 12 of the battery control unit 6 is provided so as to project from the side surface of the battery control unit 6, and a screw hole is drilled in a leading-end face of the main circuit terminal 12. The total negative
8 electrode terminal 11 and a leading end face of the main circuit terminal 12, for instance, are positioned so as to become flush with each other. The extraction conductor 13 for connecting the total negative electrode terminal 11 to the main circuit terminal 12 is housed in a resin case 14. An opening is formed at a position on a base plate 14a of the case 14 that corresponds to the total negative electrode terminal 11 and the leading end face of the main circuit terminal 12. The extraction conductor 13 is thereby formed so as to be able to contact electrically to the total negative electrode terminal 11 and the leading-end face of the main circuit terminal 12 by way of the opening.
The extraction conductor 13 is formed so as to have a straight conductor portion connecting the total negative electrode terminal 11 to the main circuit terminal 12 and a water escape portion 13a provided so as to be downwardly-extended from an arbitrary position on the straight conductor portion. A cutout 13b (first and second cutout portions) is formed in the water escape portion 13a, and the extraction conductor 13 including the water escape portion 13a is formed in a U-shape in conformance with the cutout 13b. A
bottom of the cutout 13b is formed at a position that is lower than a lower end of the main circuit terminal 12. Further, a hole into which the total negative electrode terminal 11 is to be inserted is drilled in a position at one end of the extraction conductor 13 corresponding to the total negative electrode terminal 11. The total negative electrode terminal 11 is inserted into the hole of the extraction conductor 13, and the total negative terminal 11 is screw-engaged with a nut 21, thereby connecting the extraction conductor 13. A hole into which a bolt 22 to be screw-engaged with a screw hole drilled in the main circuit
The extraction conductor 13 is formed so as to have a straight conductor portion connecting the total negative electrode terminal 11 to the main circuit terminal 12 and a water escape portion 13a provided so as to be downwardly-extended from an arbitrary position on the straight conductor portion. A cutout 13b (first and second cutout portions) is formed in the water escape portion 13a, and the extraction conductor 13 including the water escape portion 13a is formed in a U-shape in conformance with the cutout 13b. A
bottom of the cutout 13b is formed at a position that is lower than a lower end of the main circuit terminal 12. Further, a hole into which the total negative electrode terminal 11 is to be inserted is drilled in a position at one end of the extraction conductor 13 corresponding to the total negative electrode terminal 11. The total negative electrode terminal 11 is inserted into the hole of the extraction conductor 13, and the total negative terminal 11 is screw-engaged with a nut 21, thereby connecting the extraction conductor 13. A hole into which a bolt 22 to be screw-engaged with a screw hole drilled in the main circuit
9 terminal 12 is drilled at a position on the other end of the extraction conductor 13 corresponding to the main circuit terminal 12. The bolt 22 is screw-engaged into the screw hole of the main circuit terminal 12, thereby connecting the extraction conductor 13. A terminal connected to an end of an unillustrated cable is fastened to the main circuit terminal 17 by means of the bolt 22 being screw-engaged into the screw hole of the main circuit terminal by way of the bolt hole of the terminal.
An outer wall 14b surrounding an outer circumference of the extraction conductor 13 is formed on the base plate 14a of the case 14, and a portion of the outer wall 14b situated at a position corresponding to the bottom of the water escape portion 13a of the extraction conductor 13 is cut out, thereby forming an opening 14c. A plurality of claws 16 are provided on an inner surface side of the outer wall 14b, to thus hold the extraction conductor 13 mounted on the case 14. Further, a rib 14d to be inserted into the cutout 13b of the extraction conductor 13 is formed on the base plate 14a in a projecting manner. Although unillustrated, engagement projections 14e are accordingly provided on an exterior circumference of the outer wall 14b in the present embodiment, whereby a cover is to be attached to the case 14.
One voltage detection terminal 24 for detecting a voltage of each of the battery cells 2 and the extraction conductor 13 are jointly fastened and connected to the total negative electrode terminal 11. A voltage detection line is pressure-bonded to the voltage detection terminal 24, whereby the voltage 25 detection terminal 24 is connected to an unillustrated controller of the battery pack 1.
As mentioned above, in the present embodiment, a liquid, like water, intruded into the case 14 after running along the extraction conductor 13 falls on the downwardly-extending water escape portion 13a by gravitation. Since a bottom of the cutout 13b is situated at a position lower than the lower end of the main circuit terminal 12, the liquid will not rise from the water escape portion 13a toward the main circuit terminal 12 against gravity. Consequently, the liquid, such as water, intruded into the case 14 can be prevented from intruding into the battery control unit 6 while running along the extraction conductor 13.
As a consequence, a failure, which would otherwise occur as a result of a liquid, like water, intruding into the battery control unit 6, can be prevented.
According to the present embodiment, the opening 14c is formed in the bottom surface of the case 14, so that the liquid falling down while running along the extraction conductor 13 can be discharged outside the case.
Furthermore, in this case, the rib 14d conforming to the shape of the cutout 13b of the water escape portion 13a is formed so as to project from the base plate 14a, whereby a path along which a liquid like water will run directly to the main circuit terminal 12 along the extraction conductor 13 is blocked. Hence, intrusion of a liquid into the battery control unit 6 can be prevented without fail.
Although the case 14 of the embodiment can be formed integrally with the resin case of the busbar module 5, the busbar module 5 is not limited to this configuration. The busbar module 5 and the case 14 can be separately formed.
Industrial Applicability By the above configuration, a battery pack in which a liquid, like water, is prevented from intruding into a battery control unit while running along an extraction conductor connected to a battery main circuit, can be achieved.
Reference Signs List 1 battery pack 2 battery cell 3 battery assembly 4 conductor busbar module 6 battery control unit 11 total negative terminal 12 main circuit terminal 13 extraction conductor 13a water escape portion 13b cutout portion 14 case 14a base plate 14b exterior wall 14c opening 14d rib 14e engagement projection 16 claw II
An outer wall 14b surrounding an outer circumference of the extraction conductor 13 is formed on the base plate 14a of the case 14, and a portion of the outer wall 14b situated at a position corresponding to the bottom of the water escape portion 13a of the extraction conductor 13 is cut out, thereby forming an opening 14c. A plurality of claws 16 are provided on an inner surface side of the outer wall 14b, to thus hold the extraction conductor 13 mounted on the case 14. Further, a rib 14d to be inserted into the cutout 13b of the extraction conductor 13 is formed on the base plate 14a in a projecting manner. Although unillustrated, engagement projections 14e are accordingly provided on an exterior circumference of the outer wall 14b in the present embodiment, whereby a cover is to be attached to the case 14.
One voltage detection terminal 24 for detecting a voltage of each of the battery cells 2 and the extraction conductor 13 are jointly fastened and connected to the total negative electrode terminal 11. A voltage detection line is pressure-bonded to the voltage detection terminal 24, whereby the voltage 25 detection terminal 24 is connected to an unillustrated controller of the battery pack 1.
As mentioned above, in the present embodiment, a liquid, like water, intruded into the case 14 after running along the extraction conductor 13 falls on the downwardly-extending water escape portion 13a by gravitation. Since a bottom of the cutout 13b is situated at a position lower than the lower end of the main circuit terminal 12, the liquid will not rise from the water escape portion 13a toward the main circuit terminal 12 against gravity. Consequently, the liquid, such as water, intruded into the case 14 can be prevented from intruding into the battery control unit 6 while running along the extraction conductor 13.
As a consequence, a failure, which would otherwise occur as a result of a liquid, like water, intruding into the battery control unit 6, can be prevented.
According to the present embodiment, the opening 14c is formed in the bottom surface of the case 14, so that the liquid falling down while running along the extraction conductor 13 can be discharged outside the case.
Furthermore, in this case, the rib 14d conforming to the shape of the cutout 13b of the water escape portion 13a is formed so as to project from the base plate 14a, whereby a path along which a liquid like water will run directly to the main circuit terminal 12 along the extraction conductor 13 is blocked. Hence, intrusion of a liquid into the battery control unit 6 can be prevented without fail.
Although the case 14 of the embodiment can be formed integrally with the resin case of the busbar module 5, the busbar module 5 is not limited to this configuration. The busbar module 5 and the case 14 can be separately formed.
Industrial Applicability By the above configuration, a battery pack in which a liquid, like water, is prevented from intruding into a battery control unit while running along an extraction conductor connected to a battery main circuit, can be achieved.
Reference Signs List 1 battery pack 2 battery cell 3 battery assembly 4 conductor busbar module 6 battery control unit 11 total negative terminal 12 main circuit terminal 13 extraction conductor 13a water escape portion 13b cutout portion 14 case 14a base plate 14b exterior wall 14c opening 14d rib 14e engagement projection 16 claw II
Claims (5)
1. A battery pack comprising:
a battery assembly that includes a plurality of battery cells which are arranged while positive electrodes and negative electrodes of the battery cells are alternately adjoined to each other;
a busbar module that includes a plurality of conductors and an insulating member which holds the conductors, an associated said conductor interconnecting the positive electrode and the negative electrode of each of the adjoining battery cells in the battery assembly;
a battery control unit provided at an end portion of the battery assembly in a direction in which the battery cells are arranged; and an extraction conductor that connects a total electrode terminal connected to a total positive electrode or a total negative electrode of the battery assembly to a main circuit terminal of the battery control unit, wherein the extraction conductor has a water escape portion which is located below an imaginary line connecting the total electrode terminal to the main circuit terminal, and an upper end of the water escape portion is formed at a location that is lower than a lower end of the main circuit terminal;
wherein the extraction conductor has a first cutout portion which is located between the total electrode terminal and the main circuit terminal;
wherein the water escape portion has a second cutout portion so that the water escape portion is shaped in U shape, the second cutout portion being communicated with the first cutout portion; and wherein a bottom of the second cutout portion is formed at a position lower than the lower end of the main circuit terminal.
a battery assembly that includes a plurality of battery cells which are arranged while positive electrodes and negative electrodes of the battery cells are alternately adjoined to each other;
a busbar module that includes a plurality of conductors and an insulating member which holds the conductors, an associated said conductor interconnecting the positive electrode and the negative electrode of each of the adjoining battery cells in the battery assembly;
a battery control unit provided at an end portion of the battery assembly in a direction in which the battery cells are arranged; and an extraction conductor that connects a total electrode terminal connected to a total positive electrode or a total negative electrode of the battery assembly to a main circuit terminal of the battery control unit, wherein the extraction conductor has a water escape portion which is located below an imaginary line connecting the total electrode terminal to the main circuit terminal, and an upper end of the water escape portion is formed at a location that is lower than a lower end of the main circuit terminal;
wherein the extraction conductor has a first cutout portion which is located between the total electrode terminal and the main circuit terminal;
wherein the water escape portion has a second cutout portion so that the water escape portion is shaped in U shape, the second cutout portion being communicated with the first cutout portion; and wherein a bottom of the second cutout portion is formed at a position lower than the lower end of the main circuit terminal.
2. The battery pack according to claim 1, wherein the total electrode terminal and the main circuit terminal are formed respectively on a side surface of the battery assembly and a side surface of the battery control unit on the same side.
3. The battery pack according to claim 1 or 2, wherein both ends of the extraction conductor are fastened respectively to the total electrode terminal and the main circuit terminal with a bolt or a nut.
4. The battery pack according to any one of claims 1 to 3, wherein the extraction conductor is contained in a resin case, and an opening is formed in a bottom surface of the case.
5. The battery pack according to claim 4, wherein the resin case has a rib to be held in the first cutout of the water escape portion.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-165126 | 2011-07-28 | ||
| JP2011165126A JP5554757B2 (en) | 2011-07-28 | 2011-07-28 | Battery pack |
| PCT/JP2012/069526 WO2013015446A1 (en) | 2011-07-28 | 2012-07-25 | Battery pack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2840575A1 CA2840575A1 (en) | 2013-01-31 |
| CA2840575C true CA2840575C (en) | 2016-05-03 |
Family
ID=46690662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2840575A Active CA2840575C (en) | 2011-07-28 | 2012-07-25 | Battery pack |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US9947911B2 (en) |
| EP (1) | EP2737561B1 (en) |
| JP (1) | JP5554757B2 (en) |
| CN (1) | CN103733383B (en) |
| CA (1) | CA2840575C (en) |
| WO (1) | WO2013015446A1 (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20240055130A (en) | 2012-08-16 | 2024-04-26 | 에노빅스 코오퍼레이션 | Electrode structures for three-dimensional batteries |
| CN105308772B (en) | 2013-03-15 | 2018-11-16 | 艾诺维克斯公司 | Separator for three-dimensional battery |
| JP5998084B2 (en) * | 2013-03-15 | 2016-09-28 | 日立オートモティブシステムズ株式会社 | Power storage module |
| KR102175475B1 (en) * | 2013-05-16 | 2020-11-06 | 타이코에이엠피 주식회사 | An electric components chamber of a battery pack and a battery package comprising thereof |
| JP6317898B2 (en) * | 2013-08-08 | 2018-04-25 | 矢崎総業株式会社 | Bus bar module |
| JP6131966B2 (en) * | 2015-01-30 | 2017-05-24 | トヨタ自動車株式会社 | Battery and battery pack |
| TWI793480B (en) | 2015-05-14 | 2023-02-21 | 美商易諾維公司 | Longitudinal constraints for energy storage devices |
| TWI739830B (en) | 2016-05-13 | 2021-09-21 | 美商易諾維公司 | Dimensional constraints for three-dimensional batteries |
| DE102016219894B3 (en) | 2016-10-12 | 2018-03-01 | Audi Ag | Battery and motor vehicle with a battery |
| TWI819481B (en) | 2016-11-16 | 2023-10-21 | 美商易諾維公司 | Three-dimensional batteries with compressible cathodes |
| KR102859540B1 (en) * | 2017-11-15 | 2025-09-17 | 에노빅스 코오퍼레이션 | Electrode assembly and secondary battery |
| US10256507B1 (en) | 2017-11-15 | 2019-04-09 | Enovix Corporation | Constrained electrode assembly |
| US11211639B2 (en) | 2018-08-06 | 2021-12-28 | Enovix Corporation | Electrode assembly manufacture and device |
| CN111430616B (en) * | 2020-04-02 | 2024-10-15 | 欣旺达动力科技股份有限公司 | Battery Module |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3504839B2 (en) * | 1997-12-03 | 2004-03-08 | 株式会社オートネットワーク技術研究所 | Battery post connector and battery connection terminal cover |
| JP4080132B2 (en) * | 2000-03-15 | 2008-04-23 | 新神戸電機株式会社 | Assembled battery |
| JP5285961B2 (en) * | 2008-05-27 | 2013-09-11 | 株式会社ケーヒン | Battery control device for battery pack |
| JP2010003466A (en) * | 2008-06-18 | 2010-01-07 | Autonetworks Technologies Ltd | Battery module |
| JP5264373B2 (en) | 2008-09-01 | 2013-08-14 | 矢崎総業株式会社 | Fuse block |
| JP5144582B2 (en) | 2009-04-23 | 2013-02-13 | トヨタ自動車株式会社 | Leakage transmission suppression structure for power storage devices |
| JP5490459B2 (en) * | 2009-07-22 | 2014-05-14 | 三洋電機株式会社 | Pack battery |
| JP2011049155A (en) * | 2009-07-30 | 2011-03-10 | Sanyo Electric Co Ltd | Battery system and electric vehicle including the same |
| JP5375648B2 (en) * | 2010-02-15 | 2013-12-25 | 凸版印刷株式会社 | Non-contact IC label |
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2011
- 2011-07-28 JP JP2011165126A patent/JP5554757B2/en active Active
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2012
- 2012-07-25 CN CN201280037851.2A patent/CN103733383B/en active Active
- 2012-07-25 EP EP12748264.4A patent/EP2737561B1/en active Active
- 2012-07-25 WO PCT/JP2012/069526 patent/WO2013015446A1/en not_active Ceased
- 2012-07-25 CA CA2840575A patent/CA2840575C/en active Active
- 2012-07-25 US US14/234,722 patent/US9947911B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103733383A (en) | 2014-04-16 |
| CA2840575A1 (en) | 2013-01-31 |
| US9947911B2 (en) | 2018-04-17 |
| JP5554757B2 (en) | 2014-07-23 |
| US20140154531A1 (en) | 2014-06-05 |
| EP2737561A1 (en) | 2014-06-04 |
| EP2737561B1 (en) | 2014-12-24 |
| CN103733383B (en) | 2016-05-04 |
| WO2013015446A1 (en) | 2013-01-31 |
| JP2013030342A (en) | 2013-02-07 |
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