WO2019130424A1

WO2019130424A1 - Battery device

Info

Publication number: WO2019130424A1
Application number: PCT/JP2017/046632
Authority: WO
Inventors: 知也真壁
Original assignee: 本田技研工業株式会社
Priority date: 2017-12-26
Filing date: 2017-12-26
Publication date: 2019-07-04

Abstract

This battery device is provided with: a battery body (36); a plus terminal (25A) connected to the positive electrode of the battery body (36); a minus terminal (25B) connected to the negative electrode of the battery body (36); a third terminal (25C) provided separately from the plus terminal (25A) and the minus terminal (25B); and a control unit (37) provided between the battery body (36) and the third terminal (25C). The control unit (37) is provided with: a battery voltage detection unit (38) for detecting the voltage of the battery body (36); and a switch (39) for connecting/disconnecting a feed path (42) between the battery body (36) and the third terminal (25C) on the basis of the voltage detected by the battery voltage detection unit (38). The switch (39) disconnects the feed path (42) when the voltage detected by the battery voltage detection unit (38) has become less than, or less than or equal to, a threshold value (VC).

Description

Battery device

The present invention relates to a battery device.

In the case of a battery system mounted on a vehicle, in the case of a large vehicle model or a vehicle model equipped with a large number of optional parts, the dark current load consumed when the ignition switch is off is large. At the time of leaving, the battery capacity may be lost, and so-called battery exhaustion may occur. On the other hand, mounting a battery having a large capacity is not acceptable in terms of size and weight, particularly in the case of a small vehicle such as a motorcycle.
Therefore, as a prior art, against the dark current load operated by the power supplied from the battery after the engine is stopped, the battery is supplied with the power via the power supply line opening / closing means, preventing the battery from rising (overdischarge). The method is known.

JP 2004-291720 A

However, in the above-mentioned prior art, it is necessary to provide a relay or the like for switching the power supply line for each dark current load, and there is room for improvement in terms of space and cost.

Therefore, the present invention provides a battery device that can supply power to a dark current load while preventing a battery from rising due to the dark current load.

One aspect of the present invention is a battery body (36), a positive terminal (25A) connected to the positive electrode of the battery body (36), and a negative terminal (25B) connected to the negative electrode of the battery body (36) And a third terminal (25C) provided separately from the positive terminal (25A) and the negative terminal (25B), and a control provided between the battery body (36) and the third terminal (25C) A battery voltage detection unit (38) for detecting the voltage of the battery body (36); and a voltage detected by the battery voltage detection unit (38). And a switch (39) for connecting and disconnecting a feed path (42) between the battery body (36) and the third terminal (25C), the switch (39) comprising the battery voltage detector (3) Shut off the feeding path (42) when the voltage detected by the) falls below or below the threshold (VC). According to this configuration, in the battery device, the third terminal separately from the plus terminal and the minus terminal. And a switch for connecting and disconnecting the feed path between the third terminal and the battery body. Then, by connecting the dark current load and the battery body using the third terminal, when the voltage of the battery body falls below or below the threshold value, the switch may cut off the power supply to the dark current load. It becomes possible. Therefore, when the battery voltage drops, the dark current load can be shut off to prevent overdischarge of the battery body.
In the battery device, a control unit is provided between the battery main body and the third terminal for interrupting the feeding path. Thus, it is not necessary to provide a relay or the like for switching the power supply line for each dark current load connected to the third terminal, and the existing dark current load can be used as it is. Therefore, it is possible to suppress an increase in the part cost and to suppress an increase in the part arrangement space.

In one aspect of the present invention, the switch (39) includes a semiconductor relay.
According to this configuration, in the battery device, the switch can be made compact and have a long life, and the response to the command can be enhanced, as compared with the case where the mechanical relay (contact relay) is provided.

In one aspect of the present invention, the third terminal (25C) is connected to the positive electrode of the battery body (36).
According to this configuration, in the battery device, even when a high voltage is applied during charging of the battery main body, failure of the switch can be prevented.
Further, in the battery device, when the negative side of the battery main body is connected to the dark current load component via the third terminal, it is necessary to provide a relay or the like for opening and closing the power supply line in each dark current load. On the other hand, by connecting the positive side of the battery body to the dark current load via the third terminal, a relay or the like for switching the power supply line is provided for each dark current load connected to the third terminal. There is no need for it, and the existing dark current load can be used as it is. Therefore, it is possible to suppress an increase in the part cost and to suppress an increase in the part arrangement space.

In one aspect of the present invention, the plus terminal (25A) and the minus terminal (25B) are spaced apart from each other, and a gap between the plus terminal (25A) and the minus terminal (25B) is provided. , The third terminal (25C) is disposed.
According to this configuration, in the battery device, the plus terminal and the minus terminal are laid out with respect to the vehicle body so that wiring can always be connected. Therefore, the third terminal is disposed between the plus terminal and the minus terminal. By doing this, even if the battery arrangement method changes, it becomes easy to connect the wiring to the plus terminal and the minus terminal, and the third terminal arranged side by side. Therefore, flexible connections can be made according to various battery arrangements, and attachment and detachment of the battery device can be facilitated.

According to an aspect of the present invention, it is possible to provide a battery device capable of preventing a battery runout due to a dark current load while being able to supply power to the dark current load.

It is a perspective view of the battery apparatus of this embodiment. It is II-II sectional drawing of FIG. It is a structure block diagram of the battery control system of this embodiment. It is a graph which shows the time change of the voltage of the said battery apparatus. It is a perspective view which shows arrangement | positioning of the terminal of the said battery apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The battery device of the present embodiment is a battery mounted as a vehicle-mounted power source on a saddle-ride type vehicle such as a motorcycle, and includes a secondary battery capable of repeated charge and discharge.

As shown in FIGS. 1 and 2, the battery device 1 includes a substantially rectangular case 10. Inside the case 10, a plurality of secondary batteries 11 are accommodated. The battery device 1 connects a plurality of secondary batteries 11 in series, and raises the output voltage to a predetermined voltage. The battery device 1 incorporates a battery monitoring unit (BMU: Battery Managing Unit) that monitors a plurality of secondary batteries 11. The BMU normally measures the voltage or the like of each secondary battery 11 and detects overcharge or overdischarge during charge and discharge. The BMU also has a function of maintaining the voltage balance of each secondary battery 11.

The case 10 has a lower case 10L and an upper case 10U coupled to the upper portion of the lower case 10L, and the lower case 10L and the upper case 10U are partitioned by the partition wall 12 There is. The inside of the housing 10 is sealed except for an exhaust passage 26 described later. The plurality of secondary batteries 11 are accommodated in the lower housing 10L. The battery monitoring circuit 21 as the BMU is accommodated in the upper housing 10U. The battery monitoring circuit 21 monitors the voltage of the secondary battery 11, and cuts off the charging current to the secondary battery 11 when the secondary battery 11 is overcharged.

The secondary battery 11 is, for example, a lithium ion battery. For example, the positive electrode 14, the negative electrode 15, the separator 16, the non-aqueous electrolyte 17, and the like are housed inside the container 13 of the secondary battery 11. In the container 13 of the secondary battery 11, a battery terminal 18 (a positive electrode terminal and a negative electrode terminal) for charging and discharging a current is provided.

In the upper wall 10a of the rectangular shape in a plan view of the housing 10, at upper corner portions on both sides of one side along the longitudinal direction of the shape in plan view, a stepped portion which is stepped down with respect to the upper surface of the general portion of the upper wall 10a 10b is formed. The positive terminal 25A and the negative terminal 25B of the battery device 1 are provided in the two step portions 10b. Each of the

terminals

25A and 25B is connected to the positive and negative battery terminals 18 of the secondary battery 11 in the housing 10, respectively.

Through holes 19 for allowing the gas generated from the secondary battery 11 to flow to the upper housing 10U side are formed in the partition wall 12 which partitions the housing 10. The upper wall 10 a of the housing 10 is provided with an exhaust passage 26 for discharging the gas flowing into the upper housing 10 U through the through hole 19 to the outside of the housing 10. For example, the exhaust passage 26 has a cylindrical shape extending vertically, and a cap-like valve body 27 made of an elastic material such as rubber is attached to the upper portion thereof. The valve body 27 functions as an exhaust valve for releasing the pressure to the outside when the pressure inside the housing 10 rises, and normally closes the exhaust passage 26. A cover 28 flush with the upper wall 10 a is mounted above the valve body 27.

Referring also to FIG. 3, the battery device 1 mounted on the vehicle supplies power to the electrical components (general load 34 and dark current load 35) mounted on the vehicle as standard or option. Even if the ignition switch (main switch) SW1 is off, the battery device 1 supplies a dark current (backup power supply, standby power supply) to a part (dark current load 35) of the electric component. Due to this dark current, the battery device 1 consumes the battery capacity even if the ignition switch SW1 is off. Therefore, when the vehicle engine (internal combustion engine) and the generator 32 are stopped for a long time due to long-term parking etc. and the state where the external power supply is not connected continues, so-called battery exhaustion (overdischarge of the battery main body 36) occurs. May occur.

In the battery device 1 of the present embodiment, when the battery voltage falls below a predetermined threshold (dark current cut threshold VC described later), the analog circuit (dark current control unit 37) mounted on the battery device 1 sends the dark current load 35 Power supply path (second power supply path 42) is cut, and the power supply to the dark current load 35 is cut.

A battery control system including the battery device 1 of the present embodiment will be described with reference to FIG.
The battery control system includes a battery device 1, an ignition switch SW1, a starter switch SW2, a regulator 31, a generator 32, a starter motor 33, a general load 34, and a dark current load 35.
The battery device 1 includes a battery body 36, a dark current control unit 37, a plus terminal 25A, a minus terminal 25B, and a dark current connection terminal 25C.
The dark current control unit 37 includes a Vb detection unit (battery voltage detection unit) 38 and a switching element 39.

The battery body 36 is an assembly in which a plurality of secondary batteries 11 are connected in series. The battery body 36 has a positive electrode connected to the positive terminal 25A and a negative electrode connected to the negative terminal 25B. The plus terminal 25A is connected to one end of the ignition switch SW1, and the minus terminal 25B is grounded. The other end of the ignition switch SW1 is connected to the respective positive electrodes of the general load 34 and the dark current load 35, and is also connected to the positive electrode of the starter motor 33 via the starter switch SW2. The respective negative electrodes of the general load 34, the dark current load 35 and the starter motor 33 are grounded. A dark current connection terminal 25C is connected to the positive electrode of the dark current load 35 via the fuse h3.

The generator 32 is connected to the input terminal of the regulator 31. The output terminal of the regulator 31 is connected to the positive electrode of the battery main body 36 through the fuse h1. The ground terminal of the regulator 31 is grounded.

In the dark current control unit 37, one end of the Vb detection unit 38 is connected to the positive electrode of the battery main body 36, and the other end of the Vb detection unit 38 is connected to the negative electrode of the battery main body 36. One end of the Vb detection unit 38 is connected to the drain terminal of the switching element 39 via the fuse h2. The switching element 39 has a source terminal connected to the dark current connection terminal 25C, and a gate terminal connected to the Vb detection unit 38. For example, the switching element 39 is an N-channel MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor: metal oxide semiconductor field effect transistor).

The starter motor 33 is driven by the electric power of the battery device 1 and performs cranking via, for example, a one-way clutch to start the engine.
The generator 32 is a generator motor (ACG (Alternating Current Generator), for example, coaxially arranged with a crankshaft of the engine and driven by rotation of the crankshaft. That is, the generator 32 is operated by the engine. The generator 32 supplies the generated power to the regulator 31. The regulator 31 boosts or steps down the voltage supplied from the generator 32 to a predetermined voltage to charge the battery main body 36. Power may be supplied directly from the generator 32 to the general load 34 and the dark current load 35.

The general load 34 is a load to which power is supplied from the battery device 1 when the ignition switch SW1 is on. The general load 34 includes, for example, an engine ignition system, a fuel supply system, various lamps and the like.
The dark current load 35 is a load to which power is constantly supplied from the battery device 1 including a state in which the vehicle is stopped and the engine is stopped. The dark current load 35 includes, for example, an electronic control unit (ECU), a clock, various communication devices, and the like.

When the ignition switch SW1 is on, power is supplied to the dark current load 35 from the plus terminal 25A of the battery device 1 through the first power feeding path 41.
If the battery voltage is equal to or higher than the dark current cut threshold VC when the ignition switch SW1 is off, the dark current load 35 receives power from the dark current connection terminal 25C of the battery device 1 through the third power feeding path 43. Supplied. A fuse h3 is interposed in the third feed path 43.

The Vb detection unit 38 is configured to include an integrated circuit. The Vb detection unit 38 detects voltage values at both ends of the battery main body 36 and compares the voltage values with a predetermined dark current cut threshold VC. When the voltage value of the battery body 36 is less than the dark current cut threshold VC, the Vb detection unit 38 outputs an H (high) level signal to turn on the switching element 39. When the voltage value of the battery body 36 is equal to or higher than the dark current cut threshold VC, the Vb detection unit 38 outputs an L (low) level signal to turn off the switching element 39.

The switching element 39 connects and disconnects the second feed path 42 across the positive electrode of the battery body 36 and the dark current connection terminal 25C. That is, when the voltage value of the battery body 36 is less than the threshold value, the second feed path 42 is disconnected, and the power supply from the dark current connection terminal 25C to the dark current load 35 is stopped. When the voltage value of the battery body 36 is equal to or higher than the threshold value, the second power feeding path 42 is connected, and power can be supplied from the dark current connection terminal 25C to the dark current load 35. A fuse h2 is interposed between the positive electrode of the battery main body 36 and the switching element 39 in the second feed path 42.

The time change of the battery voltage will be described with reference to FIG. In the graph of FIG. 4, the vertical axis represents battery voltage and the horizontal axis represents time.
The dark current load 35 consumes battery capacity in a region where the battery voltage exceeds the dark current cut threshold VC (always-on power supply region). In a region where the battery voltage is lower than the dark current cut threshold VC (dark current cut region), the dark current control unit 37 cuts off the second power feeding path 42, whereby the consumption of the battery capacity is suppressed (line V1 in FIG. ). A line V2 in the drawing indicates that the battery capacity is consumed while the dark current control unit 37 is connected to the second feed path 42.

After the dark current control unit 37 cuts off the second power feeding path 42, the ignition switch SW1 is turned on, and when a voltage change (ΔV) due to the general load 34 is generated (in the figure, IGN_ON portion) The Vb detection unit 38 detects and outputs a signal (FET_ON signal) for turning on the switching element 39. As a result, the second power supply path 42 returns from the cutoff state to the connection state.

In the present embodiment, when the voltage value of the battery main body 36 becomes less than the dark current cut threshold VC, the dark current load 35 is not supplied with power from the battery main body 36 by turning off the switching element 39. did. This makes it necessary to provide switches and relays for individually stopping the supply of power to each of the dark current loads 35 that consume power when the vehicle is stopped (when the engine is stopped or ACG is stopped). It disappears. As a result, it is possible to reduce parts, reduce costs, and further reduce the space.

The arrangement of the terminals of the battery device 1 will be described with reference to FIGS. 1 and 5.
The stepped portion 10b on the side where the plus terminal 25A is installed is provided wider than the stepped portion 10b on the side where the negative terminal 25B is installed in the direction along the longitudinal direction of the plan view shape of the upper wall 10a. .

The dark current connection terminal 25C is a positive electrode, and is disposed closer to the plus terminal 25A than the central portion in the longitudinal direction. The reason why the step portion 10b where the negative terminal 25B is installed is large is to store and pack bolts and nuts for connecting external wiring to the terminals 25A to 25C when the battery device 1 is transported. Since the dark current connection terminal 25C is disposed closer to the plus terminal 25A, the step portion 10b in which the plus terminal 25A is installed is not suitable for enlargement.

A dark current connection terminal 25C is disposed in the gap between the two

terminals

25A and 25B on one side along the longitudinal direction of the top wall 10a in plan view. Therefore, the external terminals can be connected also to the dark current connection terminal 25C by extension of the work of connecting the external wiring to the both

terminals

25A and 25B. Further, since both the

terminals

25A and 25B are disposed at the end in the longitudinal direction, and the dark current connection terminal 25C is disposed at the middle in the longitudinal direction, it is possible to distinguish between the both

terminals

25A and 25B and the dark current connection terminal 25C. It is easy and can suppress the mistake of the external wiring. Further, by making the terminals themselves of the respective terminals 25A to 25C have the same configuration, the external wiring can be made detachable with the same tool from the same direction, and the mounting / demounting workability can be improved. Further, the concave portion 10c provided with the dark current connection terminal 25C can be shielded by the removable cover 10d, thereby making the appearance of the battery device 1 good when the dark current connection terminal 25C is not used It is possible to eliminate the hindrance to the function of the dark current connection terminal 25C due to the

As described above, the battery device 1 in the above embodiment includes the battery body 36, the positive terminal 25A connected to the positive electrode of the battery body 36, and the negative terminal 25B connected to the negative electrode of the battery body 36. A dark current connection terminal 25C provided separately from the plus terminal 25A and the minus terminal 25B, and a dark current control unit 37 provided between the battery main body 36 and the dark current connection terminal 25C, wherein the dark current The control unit 37 detects a voltage of the battery main body 36, and a second power supply path 42 between the battery main body 36 and the dark current connection terminal 25C based on the voltage detected by the Vb detection unit 38. And the switching element 39 is configured such that the voltage detected by the Vb detection unit 38 is dark. When it is less than the flow cut threshold VC (threshold or below), is to cut off the second feed path 42.

According to this configuration, in the battery device 1, the dark current connection terminal 25C is provided separately from the plus terminal 25A and the minus terminal 25B, and the second power supply path 42 is provided between the dark current connection terminal 25C and the battery main body 36. And a switching element 39 for connecting and disconnecting. Then, by connecting the dark current load 35 and the battery main body 36 using the dark current connection terminal 25 C, when the voltage of the battery main body 36 becomes less than or less than the threshold value, the switching element 39 It is possible to cut off the power supply of Therefore, when the battery voltage drops, the dark current load 35 can be shut off to prevent overdischarge of the battery body 36.
Further, in the battery device 1, a dark current control unit 37 is provided between the battery main body 36 and the dark current connection terminal 25C for interrupting the second power supply path 42. As a result, it is not necessary to provide a relay or the like for switching the power supply line for each dark current load 35 connected to the dark current connection terminal 25C, and the existing dark current load 35 can be used as it is. Therefore, it is possible to suppress an increase in the part cost and to suppress an increase in the part arrangement space.

Moreover, in the battery device 1 in the above embodiment, the switching element 39 includes a semiconductor relay.
According to this configuration, it is possible to make the switching element 39 compact and have a long life and to improve the response to the command, as compared with the case where the battery device 1 includes the mechanical relay (contact relay). The switching element 39 is not limited to a semiconductor relay (contactless relay) such as a MOSFET, but may be a mechanical relay (contacted relay).

Further, in the battery device 1 according to the embodiment, the dark current connection terminal 25C is connected to the positive electrode of the battery main body 36.
According to this configuration, in the battery device 1, even when a high voltage is applied when charging the battery main body 36, it is possible to prevent the failure of the switching element 39.
Further, in the battery device 1, when the dark current load 35 is connected to the negative side of the battery main body 36 via the dark current connection terminal 25C, it is necessary to provide each dark current load 35 with a relay or the like for switching the power supply line. It occurs. On the other hand, by connecting the positive side of the battery main body 36 to the dark current load 35 via the dark current connection terminal 25C, the individual dark current loads 35 connected to the dark current connection terminal 25C can be opened and closed. It is not necessary to provide a relay or the like, and the existing dark current load 35 can be used as it is. Therefore, it is possible to suppress an increase in the part cost and to suppress an increase in the part arrangement space.

Further, in the battery device 1 in the above embodiment, the plus terminal 25A and the minus terminal 25B are disposed apart from each other, and the dark current is provided in the gap between the plus terminal 25A and the minus terminal 25B. The connection terminal 25C is disposed.
According to this configuration, in battery device 1, positive terminal 25A and negative terminal 25B are laid out with respect to the vehicle body so that wiring can always be connected, and therefore, there is a dark space between positive terminal 25A and negative terminal 25B. By arranging the current connection terminal 25C, it becomes easy to connect a wire to the plus terminal 25A, the minus terminal 25B, and the dark current connection terminal 25C arranged side by side even if the arrangement method of the battery is changed. For this reason, flexible connection according to various battery arrangement is possible, and attachment / detachment and layout of the battery device 1 can be facilitated.

The present invention is not limited to the above embodiment. For example, the secondary battery is not limited to a lithium ion battery, and may be a nickel hydrogen battery, a sodium ion battery, or the like. The present invention is not limited to the application to small vehicles such as motorcycles, but may be applied to various transportation devices such as passenger cars and freight cars, and is also applicable to facilities other than transportation devices.
The configuration in the above embodiment is an example of the present invention, and various modifications can be made without departing from the scope of the present invention, such as replacing the components of the embodiment with known components.

1 Battery device 25A positive terminal 25B negative terminal 25C dark current connection terminal (third terminal)
36 Battery main body 37 Dark current control unit (control unit)
38 Vb detector (battery voltage detector)
39 Switching element (switch)
VC dark current cut threshold (threshold)

Claims

Battery body (36),
A positive terminal (25A) connected to the positive electrode of the battery body (36);
A negative terminal (25B) connected to the negative electrode of the battery body (36);
A third terminal (25C) provided separately from the plus terminal (25A) and the minus terminal (25B);
A control unit (37) provided between the battery body (36) and the third terminal (25C);
The control unit (37) is a battery voltage detection unit (38) for detecting the voltage of the battery body (36);
A switch (39) for connecting and disconnecting a feed path (42) between the battery body (36) and the third terminal (25C) based on the voltage detected by the battery voltage detection unit (38);
The switch (39) shuts off the feed path (42) when the voltage detected by the battery voltage detection unit (38) is less than or equal to a threshold (VC).
The battery device according to claim 1, wherein the switch (39) comprises a semiconductor relay.
The battery device according to claim 1 or 2, wherein the third terminal (25C) is connected to the positive electrode of the battery body (36).
The plus terminal (25A) and the minus terminal (25B) are disposed apart from each other,
The battery device according to any one of claims 1 to 3, wherein the third terminal (25C) is disposed in a gap between the plus terminal (25A) and the minus terminal (25B).