JP2016119804A - Cargo handling work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cargo handling work vehicle equipped with a power supply device in which a plurality of battery units is electrically connected in parallel, and to suppress a reduction of the service life of the battery units.SOLUTION: A cargo handling work vehicle includes a power supply device 4 in which a plurality of battery units 41, 42 constituted by secondary batteries is electrically connected in parallel. When a protection state occurs in which either one of the plurality of battery units 41, 42 does not supply power to a motor 9, power outputted from the other battery unit is regulated to less than a predetermined maximum power. In this way, the power (particularly, the current) supplied from the other battery unit can be regulated to become large. Accordingly, a reduction of the service life of the battery units can be achieved.SELECTED DRAWING: Figure 8

Description

  The present invention relates to an electric cargo handling work vehicle in which a plurality of battery units are electrically connected in parallel.

  For example, in the vehicle for cargo handling work described in Patent Document 1, after the integrated value of the current value output from the lithium ion battery reaches the upper limit value, power is supplied only from the lead storage battery.

JP 2014-128035 A

  In a power supply device in which a plurality of battery units are electrically connected in parallel, if the power supply from any battery unit is stopped, the power borne by the stopped battery unit must be supplied from the other battery units. Absent.

For this reason, since the electric power (especially electric current) supplied from other battery units becomes large, there is a high possibility that the life of other battery units will be reduced.
In view of the above points, an object of the present invention is to suppress a reduction in the service life of a battery unit in a vehicle for cargo handling work including a power supply device in which a plurality of battery units are electrically connected in parallel.

  In the present application, in a vehicle for cargo handling work provided with an electric motor (9) that generates power, the power supply device (4) supplies electric power to the electric motor, and includes a plurality of battery units (41, 42) configured by secondary batteries. ) Is electrically connected in parallel, and when any battery unit of the plurality of battery units (41, 42) is in a protected state not supplying power to the motor (9), An output control unit (21) for limiting the power output from the other battery units to a preset maximum power or less.

  Thereby, in the invention which concerns on this application, it can suppress that the electric power (especially electric current) supplied from another battery unit becomes large. Therefore, it is possible to suppress the life reduction of the battery unit.

  Moreover, in this application, in the vehicle for cargo handling work provided with the electric motor (9) which generate | occur | produces motive power, it is a power supply device (4) which supplies electric power to an electric motor, Comprising: The several battery unit (41) comprised by the secondary battery , 42) and a power supply device (4) electrically connected in parallel, and when any battery unit among the plurality of battery units (41, 42) is in a protected state in which it can be regarded as non-chargeable. And a charging control unit (22) for setting the charging current supplied to the other battery units to be equal to or lower than a preset current value.

Thereby, in the invention which concerns on this application, it can suppress that the charging current supplied to another battery unit becomes large too much. Therefore, it is possible to suppress the life reduction of the battery unit.
Incidentally, the reference numerals in parentheses for each of the above means are examples showing the correspondence with the specific means described in the embodiments described later, and the present invention is indicated by the reference numerals in the parentheses of the above respective means. It is not limited to specific means.

1 is a side view of a forklift according to an embodiment of the present invention. 1 is a perspective view of a forklift according to an embodiment of the present invention. It is a perspective view of the power supply device 4 which concerns on embodiment of this invention. It is a perspective view which shows the state which removed the power supply device 4 in the forklift which concerns on embodiment of this invention. It is a perspective view which shows the support frame 5 and the 1st battery unit 41 which concern on embodiment of this invention. It is a side view which shows the support frame 5 and the 1st battery unit 41 which concern on embodiment of this invention. It is an enlarged view of the part of 6A of 1st wall parts and the harness cover. It is a block diagram of motor control part 20 grade. 3 is a flowchart showing the operation of the output control unit 21.

  The “embodiment of the invention” described below shows an example of the embodiment. In other words, the invention specific items described in the claims are not limited to the specific means and structures shown in the following embodiments.

  In the present embodiment, the present invention is applied to an electric forklift. The arrows and the like indicating the directions given to the drawings are described for easy understanding of the relationship between the drawings. The present invention is not limited to the directions given in the drawings.

  At least one member or part described with at least a reference numeral is provided, except where “plurality”, “two or more”, and the like are omitted. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
1. As shown in FIG. 1, the forklift 1 has a vehicle body portion 2 and a cargo handling portion 3. The cargo handling unit 3 is an operation unit that performs cargo handling, and is provided on the front side of the vehicle body unit 2. The cargo handling unit 3 is provided with an elevating mechanism 3A, a carriage 3B, and the like.

  The lifting mechanism 3A moves the carriage 3B up and down. The lifting mechanism 3A according to this embodiment includes a chain, a pulley, and a hydraulic cylinder that lifts and lowers the pulley. As shown in FIG. 2, a pair of forks 3C for supporting a cargo handling object is detachably assembled to the carriage 3B.

The vehicle body 2 is provided with a power unit having an electric motor 9 such as an electric motor and a power supply device 4. In the present embodiment, as shown in FIG. 8, the electric motor 9 includes at least a traveling electric motor 91 and a cargo handling work electric motor 92. The cargo handling electric motor 92 generates a driving force for moving the forklift 1 (for self-propelled driving). The handling work motor 92 supplies driving force to the lifting mechanism 3A. The power supply device 4 is a secondary battery that supplies power to the motor 9, and includes a first battery unit 41 and a second battery unit 42. . That is, electric power is supplied to the electric motor from the first battery unit 41 and the second battery unit 42.

  The first battery unit 41 and the second battery unit 42 are electrically connected in parallel. On the first battery unit 41 side, a shut-off device 43 that electrically disconnects the first battery unit 41 from the power supply device 4 when the first battery unit 41 is in a protected state is provided.

  “Protected state” refers to a state in which no electric power is supplied from one of the battery units (the first battery unit 41 in the present embodiment) to the electric motor 9. That is, it is a state where a failure or deterioration of the battery unit is assumed, and it is a state where it is necessary to stop the supply of power and protect the battery unit. A specific control method of the electric motor 9 will be described later.

  Specifically, for example, (a) when a failure occurs in the battery unit, (b) when the output voltage decreases to a predetermined voltage or lower, (c) the absolute value of the rate of decrease of the output voltage exceeds a predetermined value. (D) when the battery temperature is equal to or higher than the first predetermined temperature, and (e) when the battery temperature is equal to or higher than the second predetermined temperature lower than the first predetermined temperature for a predetermined time or longer. .

  A display unit (not shown) for displaying information to the worker individually displays the remaining amount of power and error information of the power supply device 4 for each of the first battery unit 41 and the second battery unit 42. The operating state of the shut-off device 43 is displayed.

  The second battery unit 42 is a secondary battery disposed on the upper side of the first battery unit 41, and is a secondary battery that needs to be replenished with battery liquid as compared with the first battery unit 41. In the present embodiment, the first battery unit 41 is a lithium ion battery, and the second battery unit 42 is a lead storage battery.

  The first battery unit 41 includes a plurality of lithium ion batteries housed in a metal casing. The casing is sealed. And the 1st battery unit 41, ie, the some lithium ion battery accommodated in the casing, does not require replenishment of a battery liquid.

  As shown in FIG. 3, the second battery unit 42 includes a metal battery box 42 </ b> A and a plurality of battery main bodies 42 </ b> B. The battery box 42A is a box-shaped member whose upper side is opened, and houses a plurality of battery main bodies 42B.

  Each battery main body 42B is a lead storage battery having a replenishing port for replenishing battery liquid on the upper side. As shown in FIG. 6, a drain port 42 </ b> C is provided at the bottom of the battery box 42 </ b> A, that is, the lower part of the second battery unit 42. The drain port 42C is an opening for discharging liquid (for example, battery fluid) accumulated in the battery box 42A.

2. Battery Device Mounting Structure The power supply device 4 (first battery unit 41 and second battery unit 42) is mounted on the lower side of the seat 2B in the vehicle body 2 as shown in FIG. An operator can sit on the seat 2B. As shown in FIG. 4, a pair of vehicle body frames 2 </ b> A is provided in a portion of the vehicle body portion 2 where the power supply device 4 is mounted.

  Each body frame 2A is a strength member provided on each side in the width direction (left-right direction) of the body portion 2, and is a beam-shaped strength member extending in the vehicle front-rear direction. Hereinafter, the vehicle body frame 2A on one end side in the width direction (left side in FIG. 4) is referred to as a first vehicle body frame 2A. The body frame 2A on the other side in the width direction (right side in FIG. 4) is referred to as a second body frame 2A.

  As shown in FIG. 5, the first battery unit 41 is supported at both ends in the width direction by a pair of body frames 2A. The first battery unit 41 according to the present embodiment is fixed to the vehicle body frame 2A by a fastener such as a bolt 41A.

  As shown in FIG. 6, the second battery unit 42 is mounted on the vehicle body portion 2 via the support frame 5. The support frame 5 includes a plurality of leg seats 51, a bridge frame 52, and the like.

  The leg seat 51 is a pillar material provided in each vehicle body frame 2 </ b> A and is a pillar material that receives the weight of the second battery unit 42. Each leg seat 51 extends upward from the body frame 2A (on the second battery unit 42 side), and its lower end side is fixed to the body frame 2A by welding or a fastener.

  As shown in FIG. 5, the bridge frame 52 connects the leg seat 51 provided on the first vehicle body frame 2A and the leg seat 51 provided on the second vehicle body frame 2A, as well as the left leg seat 51 and the right side. It extends so as to pass between the leg seats 51.

  The bridge frame 52 has at least one (five in this embodiment) reinforcing frame 52A, a plate-like tray frame 52B, and the like. The reinforcing frame 52A is a reinforcing material extending in a beam shape. The reinforcing frame 52A according to the present embodiment is a strip-shaped member, and at least one reinforcing frame 52A extends so as to pass between the left leg seat 51 and the right leg seat 51. .

  The tray frame 52B is located between the first battery unit 41 side and the second battery unit 42 side. The tray frame 52B is a reinforcing material that covers the upper surface side of the first battery unit 41 and partitions the first battery unit 41 side and the second battery unit 42 side.

  The plurality of reinforcing frames 52A are disposed on the upper surface of the tray frame 52B, and are integrated with the tray frame 52B by welding or a connecting method such as a fastener (welding in the present embodiment). Each leg seat 51 is integrated with the tray frame 52B by a joining method (screw in this embodiment) such as welding or a fastener.

  As shown in FIG. 6, the second battery unit 42 (battery box 42A) is placed on the support frame 5 in a state of being in contact with the reinforcing frame 52A. Therefore, the load due to the weight of the second battery unit 42 is received by the pair of vehicle body frames 2 </ b> A via the support frame 5 without acting on the first battery unit 41.

  A gap 41 </ b> B is provided between the bridge frame 52 and the first battery unit 41. The vertical dimension of the gap 41B and the rigidity of the support frame 5 are set to dimensions and rigidity that allow the gap 41B to exist even when a load due to the weight of the second battery unit 42 acts on the support frame 5. Has been.

  As shown in FIG. 1, a first wall portion 6A and a second wall portion 6B are provided on both sides in the front-rear direction across the support frame 5, respectively. The first wall portion 6A is a restriction wall for restricting the second battery unit 42 from being displaced rearward. The second wall portion 6B is a restriction wall for restricting the second battery unit 42 from being displaced forward.

  As shown in FIG. 5, a harness (electric wiring) 41 </ b> C connected to the first battery unit 41 is disposed on the first wall 6 </ b> A side. The first battery unit 41 is provided with through holes (not shown) into which the harnesses 41C are inserted.

  A bushing 52C for fixing the harness 41C to the first battery unit 41 is provided in each through hole. Each bushing 52 </ b> C includes a packing that hermetically seals a gap between the harness 41 </ b> C and the through hole. Note that a notch-like through portion that penetrates the harness 41C is provided in a portion of the tray frame 52B corresponding to the bushing 52C.

  As shown in FIG. 7, the harness cover 7 that covers the harness 41C from the second battery unit 42 side is assembled to the first wall 6A. The harness cover 7 functions as a spacer for securing a space for arranging the harness 41 </ b> C (hereinafter referred to as a harness space) between the first wall portion 6 </ b> A and the second battery unit 42.

  That is, the harness cover 7 is disposed between the first wall 6 </ b> A and the second battery unit 42. And when the harness cover 7 contacts the 1st wall part 6A and the 2nd battery unit 42, it is controlled that the 2nd battery unit 42 displaces to the back side, and harness space is ensured.

  As shown in FIG. 6, each body frame 2 </ b> A is provided with a drain pipe 8. Each drain pipe 8 is a pipe extending from the bridge frame 52 side to the vehicle body frame 2A side, and guides the drainage discharged from the drain port 42C to the lower part of the vehicle body.

  The inlet 8A of the drain pipe 8, that is, the opening on the bridge frame 52 side of the drain pipe 8 is opened at a position corresponding to the drain port 42C. In other words, the inlet portion 8A opens directly below the drain port 42C. The opening diameter of the inlet portion 8A according to the present embodiment is set to be larger than the opening diameter of the drain port 42C.

3. 3. Control of Electric Motor 3.1 Configuration of Control Unit As shown in FIG. 8, the operation (motor output) of the electric motor 9 (the cargo handling work motor 92 and the cargo handling work motor 92) is controlled by the motor control unit 20. The motor control unit 20 is provided with an output control unit 21. The output control unit 21 controls the output power of the power supply device 4.

  The electric motor control unit 20 according to the present embodiment is configured by a computer having a CPU, a ROM, a RAM, and the like. A program (software) for controlling the operation of the electric motor 9 is stored in advance in a nonvolatile storage unit such as a ROM.

  The output control unit 21 according to the present embodiment is realized by an operation control program for the power supply device 4. In other words, the output control unit 21 is realized by executing the program using hardware resources such as a CPU constituting the electric motor control unit 20.

  The charging control unit 22 is a charger that controls the charging current supplied to the power supply device 4. The charging control unit 22 includes a computer having a CPU, a ROM, a RAM, and the like, a current control circuit (not shown) controlled by the computer, and the like. A program (software) for controlling the operation of the current control circuit is stored in advance in a nonvolatile storage unit such as a ROM.

3.2 Outline of control operation <Output control unit>
The output control unit 21 operates when any one of the first battery unit 41 and the second battery unit 42 (in the present embodiment, the first battery unit 41) is in a protected state, that is, the blocking device 43 is activated. Then, the power output from other battery units (second battery unit 42 in this embodiment) is limited to a preset maximum power Wmax or less.

Specifically, the output control unit 21 sets the total power supplied to the traveling motor 91 and the cargo handling work motor 92 to a state where the total power is limited to the maximum power Wmax or less.
At this time, when the traveling motor 91 and the cargo handling work motor 92 operate simultaneously, the output control unit 21 makes the power supplied to the cargo handling work motor 92 larger than the power supplied to the traveling motor 91. This is because forklift operations are usually carried out while the vehicle is stopped.

  In this embodiment, since the interruption | blocking apparatus 43 operate | moves only with respect to the 1st battery unit 41, the maximum electric power Wmax which concerns on this embodiment is based on the maximum output current (for example, 200A-300A) of the 2nd battery unit 42. Is set.

  The specific value of the maximum power Wmax may be any of a fixed value determined in advance and a fluctuation value set by the output control unit 21 based on the state of other battery units, that is, the second battery unit 42.

  In the state where the power output from the other battery units (second battery unit 42 in the present embodiment) is limited to the maximum power Wmax or less, the supplied power varies within the range of the maximum power Wmax or less. That is, when the electric power required by the electric motor 9 is less than the maximum electric power Wmax, the electric power supplied to the electric motor 9 is electric power less than the maximum electric power Wmax.

<Charge control unit>
The charging control unit 22 is in a protected state in which any one of the first battery unit 41 and the second battery unit 42 (in this embodiment, the first battery unit 41) can be regarded as unchargeable. When the shut-off device 43 is activated, the charging current supplied to the other battery units (in the present embodiment, the second battery unit 42) is a preset current value (hereinafter referred to as a set current value). Restrict to:

  In this embodiment, since the interruption | blocking apparatus 43 operate | moves only with respect to the 1st battery unit 41, the setting electric current value which concerns on this embodiment is based on the maximum charging current (for example, 200A-300A) of the 2nd battery unit 42. Is set.

  The specific value of the set current value may be any of a fixed value determined in advance and a fluctuation value set by the charging control unit 22 based on the state of the other battery unit, that is, the second battery unit 42. The “state of the second battery unit 42” is, for example, the temperature of the second battery unit 42, the deterioration state of the second battery unit 42 (for example, the total number of charge / discharge cycles), or the like.

3.3 Details of control operation of output control unit (see Fig. 9)
When a start switch (not shown) of the forklift 1 is turned on, it is first determined whether or not the shut-off device 43 is activated (S1). When it is determined that the shut-off device 43 has been activated (S1: YES), it is determined whether or not the traveling motor 91 and the cargo handling work motor 92 are operating (S3).

  When it is determined that the traveling motor 91 and the cargo handling work motor 92 are in operation (S3: YES), the total power supplied to the traveling motor 91 and the cargo handling work motor 92 is equal to or less than the maximum power Wmax. In such a state, the electric power supplied to the cargo handling work electric motor 92 is controlled to be larger than the electric power supplied to the electric motor 91 for traveling (S5).

When it is determined that the traveling motor 91 and the cargo handling work motor 92 are not in operation (S3: NO), the power supplied to the operating motor is limited to the maximum power Wmax or less.
4). Features of the forklift according to this embodiment In this embodiment, when any one of the first battery unit 41 and the second battery unit 42 (in this embodiment, the first battery unit 41) is in a protected state. In addition, the power output from the other battery units (second battery unit 42) is limited to a preset maximum power or less.

  Therefore, it is possible to suppress an increase in power (particularly current) supplied from other battery units (second battery unit 42). Therefore, it is possible to suppress the life reduction of the battery unit (second battery unit 42).

  In this embodiment, when any one of the first battery unit 41 and the second battery unit 42 (in this embodiment, the first battery unit 41) is in a protected state, the other battery units (first (2) The charging current supplied to the battery unit 42) is set to a preset current value or less.

  Therefore, it can suppress that the charging current supplied to another battery unit (2nd battery unit 42) becomes large too much. Accordingly, it is possible to suppress a decrease in the lifetime of the other battery units (second battery unit 42).

  The present embodiment is characterized in that the second battery unit 42 that needs to be replenished with battery liquid as compared with the first battery unit 41 is disposed above the first battery unit 41.

  Thereby, in this embodiment, compared with the structure by which the 2nd battery unit 42 was arrange | positioned under the 1st battery unit 41, it becomes possible to perform the replenishment operation of a battery liquid easily. Therefore, it is possible to obtain a cargo handling work vehicle with high maintenance performance.

  The present embodiment is characterized in that the support frame 5 having the leg seat 51 and the bridge frame 52 is provided, and the second battery unit 42 is supported by the vehicle body frame 2A via the support frame 5.

  That is, in the present embodiment, the second battery unit 42 is supported by the vehicle body frame 2 </ b> A via the leg seat 51. For this reason, the load due to the weight of the second battery unit 42 does not act on the first battery unit 41.

  Since the leg seat 51 on one side and the leg seat 51 on the other side are connected via the bridge frame 52, the rigidity of the support frame 5 having the leg seat 51 and the bridge frame 52 can be increased. .

  In the present embodiment, the bridge frame 52 is characterized by having a reinforcing frame 52A extending in a beam shape and a plate-like tray frame 52B integrated with the reinforcing frame 52A.

  Accordingly, in the present embodiment, the first battery unit 41 is covered by the tray frame 52B. For this reason, it is possible to suppress the battery liquid from being accidentally scattered to the first battery unit 41 during the battery liquid replenishment operation.

  In the present embodiment, the bridge frame 52 is provided with an inlet portion 8A of the drain pipe 8 that guides the drainage discharged from the drain port 42C to the lower part of the vehicle body at a position corresponding to the drain port 42C. .

  Thereby, in this embodiment, the waste water from the 2nd battery unit 42 is discharged | emitted from the vehicle body lower part, without scattering to the 1st battery unit 41 side. Therefore, it is possible to easily replenish the battery liquid while protecting the first battery unit 41 from the drainage of the battery liquid or the like.

  In the present embodiment, a gap 41B is provided between the bridge frame 52 and the first battery unit 41. Thereby, in this embodiment, the space | gap part 41B can be functioned as a heat insulation part.

  In particular, in the present embodiment, since the second battery unit 42 is a lead storage battery, the amount of heat generated in the second battery unit 42 is larger than that of the first battery unit (lithium ion battery) 41. Moreover, the first battery unit (lithium ion battery) 41 is more susceptible to thermal failure than the second battery unit 42.

  Therefore, as in the present embodiment, the second battery unit 42 that generates a large amount of heat is disposed on the upper side of the first battery unit 41, and a gap is formed between the first battery unit 41 and the second battery unit 42. If it is set as the structure provided with 41B, the 1st battery unit 41 can be reliably protected from a heat failure.

  Furthermore, even if the bridge frame 52 is greatly bent and deformed toward the first battery unit 41 due to some cause, a large load acts on the first battery unit 41 because the gap 41B is provided. Can be suppressed.

  The present embodiment is characterized in that a harness cover 7 is provided. Thereby, in this embodiment, it can suppress that malfunctions, such as the harness 41C being crushed by the 2nd battery unit 42, generate | occur | produce.

  By the way, in this embodiment, the ratio (= A / Z) of the energy capacity A of the first battery unit 41 to the energy capacity Z of the entire power supply device 4 is any one of the following (1) to (3). Yes. The energy capacity Z of the power supply device 4 as a whole is the sum of the energy capacity A of the first battery unit 41 and the energy capacity B of the second battery unit 42. Hereinafter, A / Z is referred to as “combination ratio”.

(1) A / Z = 0.2 or more and 0.48 or less (2) A / Z = 0.25 or more and 0.39 or less (3) A / Z = 0.28 or more and 0.37 or less The combination ratios shown in 1) to (3) indicate that when the first battery unit 41 is disposed above the second battery unit 42, the first battery unit 41 and the second battery unit 42 are in the horizontal direction. The present invention can be applied to any of the case where the second battery unit 42 is disposed in parallel with a shift, and the case where the second battery unit 42 is disposed above the first battery unit 41.

  Which combination ratio among the above (1) to (3) is adopted depends on, for example, (a) weight balance, stability and weight reduction of the forklift 1, (b) charging restrictions on the power supply device 4, and (c It can be determined from the viewpoint of the cost of the power supply device 4 and the forklift 1.

  In particular, when the combination ratio (3) is adopted, it is effective to place the second battery unit 42 above the first battery unit 41 from the viewpoints of (a) and (c). is there.

  The normal forklift 1 needs to secure an appropriate weight and a center of gravity position of the vehicle body portion 2 in accordance with the weight in order to balance the weight of the cargo handling object. According to the present embodiment, the lithium ion battery that is the first battery unit 41 has a lower weight per volume than the lead storage battery that is the second battery unit 42.

  Therefore, if the ratio of the first battery unit 41 is increased, the weight of the vehicle body portion 2 is reduced. Therefore, in order to maintain the stability of the forklift 1, it is necessary to add a new weight.

  Therefore, an extra cost for adding a new weight is required, and the size of the vehicle body 2 is increased. Therefore, it is a good idea to excessively reduce the energy capacity of the second battery unit 42 that is a lead storage battery. Absent. Therefore, if the combination ratio (3) is employed, the weight of the second battery unit 42 can be sufficiently secured, so that an additional weight is unnecessary or can be kept to a minimum.

  The battery main body 42B of the lead storage battery which is the second battery unit 42 is widely distributed in the market. And the dimension of the lead storage battery currently marketed is standardized. For this reason, it is advantageous in terms of cost to use the standardized lead acid battery.

  In addition, regardless of which combination ratio is used, the dimensions of the battery main body 42B are automatically determined. When the battery main body 42B and the first battery unit 41 are housed in the vehicle body of the forklift 1, in order not to increase the dimensions of the vehicle body portion 2 (especially the front-rear dimensions) as much as possible, the same as in the first embodiment. It is most advantageous to arrange the first battery unit and the second battery unit on the lower side of the seat 2B in a state where they are arranged in the vertical direction.

Furthermore, as described above, it is most appropriate to dispose the second battery unit 42 above the first battery unit 41 in consideration of the replenishment work of the battery liquid and the like.
(Other embodiments)
In the above-described embodiment, the present invention is applied to a forklift. However, the present invention is not limited to this, and can be applied to other vehicles for cargo handling work.

  In the above-described embodiment, the present invention is applied to a counterweight forklift. However, the present invention is not limited to this, and can be applied to a forklift vehicle in a reach type.

  In the above-described embodiment, since the blocking device 43 is provided only on the first battery unit 41 side, only the first battery unit 41 is a battery unit that can be in a protected state, but the present invention is not limited to this. For example, it is good also as a structure which can also provide the interruption | blocking apparatus 43 also in the 2nd battery unit 42 side, and any battery unit can be in a protection state.

  The blocking device 43 according to the above-described embodiment is integrated with the first battery unit 41. However, the present invention is not limited to this, and for example, the blocking device 43 may be provided in the output control unit 21. Good.

Although the output control unit 21 according to the above-described embodiment is provided in the motor control unit 20, the present invention is not limited to this, and the output control unit 21 may be provided separately.
Although the motor control unit 20, the output control unit 21, and the charge control unit 22 according to the above-described embodiment are configured by software, the present invention is not limited to this, and is configured by dedicated hardware. May be.

  In the above-described embodiment, the power supplied to the service motor 92 (hereinafter referred to as cargo handling power) is made larger than the power supplied to the travel motor 91 (hereinafter referred to as travel power). It is not limited.

  That is, for example, the motor control unit 20 determines a configuration or work state in which the user can change the setting of the ratio between the cargo handling power and the traveling power (hereinafter referred to as distribution ratio), and based on the determination. The output control unit 21 may automatically change the setting of the distribution ratio.

  In the above-described embodiment, when it is determined that the traveling motor 91 and the cargo handling work motor 92 are not in operation, the power supplied to the operating motor is limited to the maximum power Wmax or less. For example, the power supplied to the operating motor may be equal to or lower than the power determined based on the distribution ratio.

  In the above-described embodiment, the first battery unit 41 is mounted on the lower side in the vertical direction of the second battery unit 42. However, the present invention is not limited to this. For example, the second battery unit 42 is the first battery unit 42. A configuration in which the first battery unit 41 is mounted on the lower side in the vertical direction, a configuration in which the first battery unit 41 and the second battery unit 42 are mounted in parallel in the vertical direction, or the like may be used.

  Although the electric motor 9 according to the above-described embodiment is the traveling electric motor 91 and the cargo handling work electric motor 92, the present invention is not limited to this. That is, for example, other electric motors such as an electric motor that supplies driving force to the power steering or an electric motor that supplies driving force to the lifting mechanism 3A and the power steering may be used.

  In the above-described embodiment, the first battery unit 41 is a lithium ion battery and the second battery unit 42 is a lead storage battery. However, the present invention is not limited to this, for example, the first battery unit 41. It is good also as a sealed lead acid battery which does not require replenishment of battery fluid.

  The second battery unit 42 according to the above-described embodiment is supported by the vehicle body frame 2A via the support frame 5, but the present invention is not limited to this, for example, the support frame 5 is abolished. The second battery unit 42 may be directly supported by the body frame 2A.

  The leg seat 51 according to the above-described embodiment is fixed to the body frame 2A in a non-removable state. However, the present invention is not limited to this, and for example, any one of the body frame 2A and the leg seat 51 The leg seat 51 (support frame 5) may be locked and fixed by providing a convex part on one side and providing a concave part or a hole into which the convex part is fitted.

  In the above-described embodiment, the first battery unit 41 is fixed to the vehicle body frame 2A, and the second battery unit 42 is only placed on the support frame 5. However, the present invention is not limited to this. For example, the second battery unit 42 may be fixed to the vehicle body frame 2 </ b> A or the support frame 5.

  In the above-mentioned embodiment, although the harness cover 7 was assembled | attached to 6 A of 1st wall parts, this invention is not limited to this. That is, any one of a configuration in which the harness cover 7 is assembled to the battery box 42A and a configuration in which the harness cover 7 is disposed on the second wall portion 6B side may be employed.

  Further, the present invention is not limited to the above-described embodiment as long as it matches the gist of the invention described in the claims.

DESCRIPTION OF SYMBOLS 1 ... Forklift 2 ... Car body part 2A ... Car body frame 2B ... Seat 3 ... Cargo handling part 3A ... Lifting mechanism 3B ... Carriage 3C ... Fork 4 ... Power supply device 5 ... Support frame 6A ... First wall part 6B ... Second wall part 7 ... Harness cover 8 ... Drain pipe 8A ... Inlet part 9 ... Electric motor 20 ... Electric motor control part 21 ... Output control part 22 ... Charge control part 41 ... First battery unit 41B ... Air gap part 41C ... Harness 42 ... Second battery unit 42A ... Battery Box 42B ... Battery body 42C ... Drain port 43 ... Shut-off device 51 ... Leg seat 52 ... Bridge frame 52A ... Reinforcement frame 52B ... Tray frame 52C ... Bushing 91 ... Electric motor for traveling 92 ... Electric motor for cargo handling work

Claims (7)

In a cargo handling work vehicle equipped with an electric motor for generating power,
A power supply device for supplying power to the electric motor, wherein a plurality of battery units composed of secondary batteries are electrically connected in parallel, and
Output control that limits power output from other battery units to a preset maximum power or less when any one of the plurality of battery units enters a protection state in which power is not supplied to the electric motor. A vehicle for cargo handling work, comprising: In a cargo handling work vehicle equipped with an electric motor for generating power,
A power supply device for supplying power to the electric motor, wherein a plurality of battery units composed of secondary batteries are electrically connected in parallel, and
When any one of the plurality of battery units is in a protected state in which charging is considered impossible, the charging current supplied to the other battery units is limited to a preset current value or less. A vehicle for cargo handling work, comprising: a charge control unit.   The vehicle for cargo handling work according to claim 1, further comprising a shut-off device that electrically disconnects the battery unit in the protected state from the power supply device. As the electric motor, it has a motor for traveling and a motor for cargo handling work,
2. The vehicle for cargo handling work according to claim 1, wherein the output control unit is capable of executing output control for making electric power supplied to the electric motor for cargo handling work larger than electric power supplied to the electric motor for traveling. The power supply device is configured to include at least a lithium ion battery and a lead storage battery,
4. The service work vehicle according to claim 3, wherein the shut-off device operates based on whether or not the lithium ion battery is in the protection state. As the electric motor, it has a motor for traveling and a motor for cargo handling work,
The vehicle for cargo handling work according to claim 1, wherein the output control unit limits a total value of electric power supplied to the traveling motor and the electric motor for cargo handling work to the maximum electric power or less.   The said output control part is provided in the electric motor control part which controls the action | operation of the said electric motor, The vehicle for cargo handling work of Claim 1, 3-6 characterized by the above-mentioned.