Motor-driven construction machine

Abstract

A motor-driven construction machine is disclosed. One embodiment of the present invention allows integrated replacement of a plurality of battery modules and an auxiliary module, thus improving workability and convenience.

Description

Electric construction machinery

[0001] The present invention relates to an electric construction machine that can conveniently be attached to and detached from an excavator while a plurality of battery modules are integrally mounted on a frame unit.

[0002] Various types of construction machinery are used at work sites, such as construction or civil engineering sites. Construction machinery possesses mechanical structures and performance capabilities suited to the specific characteristics of each project, including roads, ports, rivers, railways, and plants.

[0003] Due to the diversity of operations performed at industrial sites, the above construction machinery can be classified into excavation equipment, loading equipment, conveying equipment, cargo handling equipment, compaction equipment, or foundation construction equipment. Specifically, construction machinery is a concept that includes a considerable number of types of equipment, such as excavators, wheel loaders, forklifts, bulldozers, trucks, or rollers.

[0004] As an example of the aforementioned construction machinery, electric excavators have been developed and are in use, and the electric excavators must be equipped with multiple batteries to drive the motor.

[0005] The above multiple batteries must have stable heat generation and cooling depending on the operating condition to improve efficiency and maintain consistent durability, so that they can be used stably even when used for a long period of time.

[0006] However, conventional electric excavators have a structure in which cooling components for cooling around multiple batteries, pump components for supplying cooling water to cool the multiple batteries, and multiple harness lines connected to the multiple batteries are complexly connected.

[0007] In particular, the aforementioned harness line requires caution as high-voltage and low-voltage lines are installed simultaneously, which may lead to safety accidents due to worker negligence.

[0008] In this case, a decrease in cooling performance may occur for the plurality of batteries, inspection and replacement become considerably complicated due to the complex harness line, and it is difficult to perform replacement of the plurality of batteries.

[0009] Embodiments of the present invention aim to provide an electric construction machine in which a plurality of battery modules can be integrally mounted and integrally detached from a frame unit equipped in an excavator.

[0010] An electric construction machine according to one embodiment of the present invention comprises: a first module unit (100) comprising a plurality of battery modules (102) positioned at the rear where a counterweight (3) is located relative to the driver's seat (2) of an excavator, and an auxiliary module (110) for cooling and heating the battery modules (102); and a second module unit (200) positioned in front of the first module unit (100).

[0011] The battery module (102) is maintained in a state of being seated inside a frame unit (103) having a predetermined volume, and the frame unit (103) is separated from the excavator while the battery module (102) is mounted thereon.

[0012] When the above frame unit (103) defines the direction facing the driver's seat (2) as the front and the direction facing the counterweight (3) as the rear, a towing bracket (103a) is provided on the front and rear, respectively.

[0013] The above frame unit (103) further includes a fixing part (103b) provided to selectively maintain a fixed state on the excavator.

[0014] The above auxiliary module (110) further includes a pair of cooling modules (112) that are respectively positioned on the left and right sides of the upper surface of the frame unit (103) and are provided to independently perform cooling and heating for the battery module (102).

[0015] The auxiliary module (110) further includes a pair of heat exchange modules (114) that are positioned adjacent to the cooling module (112) on the upper surface of the frame unit (103) to maintain the temperature of the battery module (102), and receive refrigerant from each other to perform heat exchange with the cooling module (112).

[0016] The heat exchange module (114) is connected to a pair of surge tank modules (116) for removing moisture and air resulting from the phase change of the refrigerant.

[0017] One end is connected to the cooling module (112) and the other end is connected to the heat exchange module (114), and a refrigerant line (10) for moving refrigerant is provided.

[0018] The auxiliary module (110) further includes a pair of coolant distribution modules (118) configured to distribute and supply the coolant heat-exchanged in the heat exchange module (114) to each of the plurality of battery modules (102).

[0019] A cooling water line (20) is provided for supplying cooling water, with one end connected to the cooling water distribution module (118) and the other end connected to a plurality of battery modules (102).

[0020] A power distributor (300) is disposed on the upper surface of the above frame unit (103) to receive electrical energy generated from the battery module (102) and distribute it to the electrical components equipped in the excavator.

[0021] A low-voltage cable (30) is connected between the second module unit (200) and the power distributor (300), and a high-voltage cable (40) is connected between the battery module (102) and the power distributor (300).

[0022] The above frame unit (103) is provided with a connection connector part (400) on its upper surface for electrically connecting and disconnecting the auxiliary module (110) and the power distributor (300).

[0023] The above frame unit (103) is provided with a first converter (50) on its upper surface to convert high-voltage power generated from the battery module (102) into low-voltage power required by the excavator; and a second converter (60) to convert alternating current into direct current for charging the battery module (102).

[0024] A water pump (70) is installed on the upper surface of the frame unit (103) to pressurize and supply cooling water to the battery module (102).

[0025] Embodiments of the present invention allow for convenient attachment and detachment of the battery module equipped in the electric excavator, thereby improving the operator's workability and convenience regarding battery module replacement.

[0026] Embodiments of the present invention ensure that the battery module is always stably cooled, enabling operation under optimal conditions and increasing the operating capacity of the excavator, thereby improving the duration of the work.

[0027] Embodiments of the present invention can minimize additional work associated with the attachment and detachment of an electric excavator.

[0028] FIG. 1 is a drawing showing the arrangement of the first and second module units of an electric construction machine according to the present embodiment.

[0029] FIG. 2 is a perspective view showing the state in which a first module unit is arranged in an electric construction machine according to the present embodiment.

[0030] FIG. 3 is a perspective view showing the first module unit separated in an electric construction machine according to the present embodiment.

[0031] FIGS. 4 and 5 are drawings illustrating a first module unit of an electric construction machine according to the present embodiment.

[0032] FIG. 6 is a perspective view illustrating the arrangement of a low-voltage cable and a connection connector part provided in an electric construction machine according to the present embodiment.

[0033] FIG. 7 is a drawing showing the combined state of the first and second joint connectors combined with the cooling water line provided in the electric construction machine according to the present embodiment.

[0034] FIG. 8 is a perspective view illustrating a traction bracket provided in an electric construction machine according to the present embodiment.

[0035] FIGS. 9 to 11 are drawings illustrating the separated state of a frame unit equipped with a battery module in an electric construction machine according to the present embodiment.

[0036] The advantages and features of the present disclosure and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Throughout the specification, like reference numerals refer to like components.

[0037] When one component is referred to as being "connected to" or "coupled to" another component, it includes cases where it is directly connected or coupled to the other component, or cases where another component is interposed. Conversely, when one component is referred to as being "directly connected to" or "directly coupled to" another component, it indicates that no other component is interposed. "And / or" includes each of the mentioned items and all combinations of one or more of them.

[0038] The terms used herein are for describing embodiments and are not intended to limit the disclosure. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, actions, and / or elements to the mentioned components, steps, actions, and / or elements.

[0039] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another.

[0040]

[0041] An electric construction machine according to one embodiment of the present invention will be described with reference to the drawings. Attached FIG. 1 is a drawing showing the arrangement of the first and second module units of the electric construction machine according to the present embodiment, FIG. 2 is a perspective view showing the arrangement of the first module unit in the electric construction machine according to the present embodiment, FIG. 3 is a perspective view showing the separation of the first module unit from the electric construction machine according to the present embodiment, and FIG. 4 and FIG. 5 are drawings showing the first module unit of the electric construction machine according to the present embodiment.

[0042]

[0043] Referring to the attached FIGS. 1 to 5, the present embodiment relates to an electric excavator equipped with a plurality of battery modules (102), in particular, the plurality of battery modules (102) are integrally mounted on a frame unit (103), and the entire frame unit (103) is removed from the excavator without individually separating or replacing the battery modules (102) inside the frame unit (103), and then a frame unit equipped with new battery modules is installed on the excavator to complete the work.

[0044] In addition, in this embodiment, the convenience of the worker is improved by allowing the frame unit (103) equipped with the battery module (102) to be detached at once using heavy equipment after releasing the fixed state of the frame unit (103) installed on the excavator with the removal and preliminary work of the main components combined with the battery module (102) minimized.

[0045] To this end, the present embodiment includes a first module unit (100) comprising a plurality of battery modules (102) positioned at the rear where a counterweight (3) is located relative to the driver's seat (2) of an excavator, and an auxiliary module (110) for cooling and heating the battery modules (102), and a second module unit (200) positioned at the front of the first module unit (100).

[0046] The battery module (102) is maintained in a state of being seated inside a frame unit (103) having a predetermined volume, and the frame unit (103) is separated from the excavator while the battery module (102) is mounted thereon.

[0047] When the above frame unit (103) defines the direction facing the driver's seat (2) as the front and the direction facing the counterweight (3) as the rear, a partition (not shown) is formed in the horizontal and vertical directions on the inside so that the battery module (102) can be mounted on the inside, allowing for easy mounting one by one.

[0048] As shown in the attached FIGS. 2 and 3, the frame unit (103) is equipped with a traction bracket (103a) on the front and rear sides, respectively, so that the entire unit can be separated from the excavator when a separately provided steel wire is connected.

[0049]

[0050] In this embodiment, since the battery module (102) and the auxiliary module (110) are both mounted on the frame unit (103), when the frame unit (103) is detached, it is possible to attach and detach it in one go without the hassle of disassembling or reassembling multiple components one by one, thereby improving the convenience and workability of the worker.

[0051] In particular, in this embodiment, the first module unit (100) is positioned at the location where the counterweight (3) is installed, and the second module unit (200) is positioned at the driver's seat (2), so that only the components associated with the battery module (102) are positioned in a separate location. In this case, it is more convenient for the operator to perform maintenance or replace the battery module (102), thereby improving work efficiency.

[0052]

[0053] The second module unit (200) is equipped with electrical components required for the cabin, coolers and heaters for heating and cooling, and various pump units. Unlike the first module unit (100), the second module unit (200) is not detached entirely from the excavator, so it is configured and installed as a single unit.

[0054] The auxiliary module (110) according to the present embodiment further includes a pair of cooling modules (112) that are respectively positioned on the left and right sides of the upper surface of the frame unit (103) and are provided to perform cooling for the battery module (102).

[0055] The above cooling module (112) is operated to perform cooling of the battery module (102) using low-temperature thermal energy of a refrigerant when cooling of the battery module (102) is required.

[0056] In this case, the battery module (102) can maintain a temperature within a stable operating range even when the temperature temporarily rises, thereby maintaining stable operation at all times and improving efficiency.

[0057] The above cooling module (112) is, for example, positioned on the left and right sides of the upper surface of the frame unit (103) to perform cooling for all of the battery modules (102) that are made up of multiple units.

[0058] The above cooling module (112) is configured to operate using a refrigerant as a heat source, so the temperature of the cooling water supplied to the battery module (102) can be rapidly lowered to a temperature below the ambient temperature, thereby improving cooling efficiency.

[0059]

[0060] The auxiliary module (110) further includes a pair of heat exchange modules (114) that are positioned adjacent to the cooling module (112) on the upper surface of the frame unit (103) to maintain the temperature of the battery module (102) and exchange heat with the refrigerant transferred from the cooling module (112).

[0061] The heat exchange module (114) is positioned in close proximity to the cooling module (112) and is placed on the left and right lower sides, respectively, based on the drawing. The heat exchange module (114) can lower the low-temperature thermal energy of the refrigerant supplied from the cooling module (112) to a preset temperature through heat exchange with the cooling water circulating between the heat exchange module (114) and the battery module (112), thereby allowing the temperature of the cooling water supplied to the battery module (102) to be constantly controlled.

[0062] The above heat exchange module (114) can perform stable cooling of the battery module (102) through heat exchange with the refrigerant discharged from the cooling module (112). Since this embodiment is equipped with two heat exchange modules (114), even if one heat exchange module malfunctions, the work that the excavator was doing can be performed if the other heat exchange module operates normally, thereby improving work efficiency and convenience.

[0063] The heat exchange module (114) has an electric heater built inside for heating the cooling water, so when used in winter or polar regions, the cooling water in a low temperature state can be heated to a predetermined temperature and then supplied back to the battery module (102), thereby maintaining stable operation of the battery module (102) and improving efficiency.

[0064] In this embodiment, one end is connected to the cooling module (112) and the other end is connected to the heat exchange module (114), and a refrigerant line (10) for moving refrigerant is provided.

[0065] Since the above refrigerant is a refrigerant that undergoes a chemical phase change, unlike cooling water, when cooling is required, it can be changed to a temperature below zero, thereby lowering the temperature of the cooling water for cooling the battery module (102), and thus improving cooling efficiency.

[0066] The above refrigerant line (10) is connected at the shortest possible length between the heating and cooling module (112) and the heat exchange module (114), thereby minimizing pressure drop or resistance. Additionally, since the refrigerant line (10) maintains a closed loop state, it is unnecessary to remove it from the frame unit (103), thus eliminating the need for additional work by the operator and improving convenience.

[0067]

[0068] The heat exchange module (114) is connected to a pair of surge tank modules (116) for removing moisture and air resulting from the phase change of the refrigerant. The surge tank modules (116) can improve the operating efficiency of the heat exchange module (114) by discharging bubbles or air resulting from the phase change of the refrigerant to the outside.

[0069] The surge tank module (116) is positioned on the left and right sides, respectively, at a location as close as possible to the heat exchange module (114).

[0070]

[0071] The auxiliary module (110) further includes a pair of coolant distribution modules (118) configured to distribute and supply the coolant heat-exchanged in the heat exchange module (114) to each of the plurality of battery modules (102).

[0072] The above-mentioned coolant distribution module (118) corresponds to a type of distributor for transferring coolant to each of the plurality of battery modules (102) and is configured separately in the form of a case.

[0073] In this embodiment, a cooling water line (20) is provided for supplying cooling water, with one end connected to the cooling water distribution module (118) and the other end connected to a plurality of battery modules (102). Although the cooling water line (20) is shown as having three lines branched from the cooling water distribution module (118) and extended to the battery modules (102), the number may be changed.

[0074] The above cooling water line (20) is configured such that the water supply line and the water return line are integrated, and a coating layer having a predetermined thickness is formed on the outer side for insulation and thermal insulation.

[0075] The above cooling water line (20) improves the worker's workability because, when the frame unit (103) is separated from the excavator, the worker does not need to manually separate the heat exchange module (114) or the cooling water distribution module (118).

[0076] The above cooling water line (20) is equipped with a joint connector so that it can be easily separated and reconnected when separated, thereby improving the convenience of the worker.

[0077] For example, as shown in FIG. 4, the coolant can be supplied from the coolant distribution module (118) to the surge tank module (116) and a plurality of battery modules (102) through the coolant line (20). In the coolant shown in FIG. 4, the thick solid line represents low-temperature coolant, and the thin solid line represents coolant that has been heated through heat exchange.

[0078] Also, regarding the refrigerant, the thick dotted line indicates the low-temperature refrigerant, and the thin dotted line indicates the refrigerant that has been heated through heat exchange.

[0079] The above refrigerant is a low-temperature refrigerant corresponding to the thick dotted line in the cooling module (112) that is supplied to the heat exchange module (114) to provide cooling, and after heat exchange for a predetermined period of time, it is moved to the cooling module (112) to provide stable cooling through the refrigerant.

[0080]

[0081] The above frame unit (103) is provided with a first converter (50) on its upper surface to convert high-voltage power generated from the battery module (102) into low-voltage power required by the excavator, and a second converter (60) to convert alternating current into direct current for charging the battery module (102).

[0082] The first converter (50) is provided to convert the 24V high-voltage power generated from the battery module (102) into 12V, which corresponds to low-voltage power. For example, the heat exchange module (114) and the water pump (70) described later operate at 12V, so they correspond to a configuration for converting high-voltage power.

[0083] The above second converter (60) corresponds to an onboard charger, and when charging the battery module (102), charging is performed using a direct current (DC) power source.

[0084] However, considering countries where charging is not performed using a direct current method, it is provided to enable charging using alternating current (AC). The second converter (60) receives alternating current and converts it into direct current to enable charging of the battery module (102), so it can be used stably even when charging is performed in various ways.

[0085] A cooling water line (20) is extended to allow cooling of the second converter (60) as well, so that malfunctions caused by overheating can be safely prevented in advance.

[0086]

[0087] A water pump (70) is installed on the upper surface of the frame unit (103) to pressurize and supply cooling water to the battery module (102). The water pump (70) is provided to quickly supply and move cooling water to a plurality of battery modules (102). In this case, the battery module (102) can be prevented from overheating by the cooling water that is always supplied at a constant rate.

[0088] Referring to the attached FIG. 5, a power distributor (300) is disposed on the upper surface of the frame unit (103) to receive electrical energy generated from the battery module (102) and distribute it to the electrical components equipped in the excavator.

[0089] The above power distributor (300) is provided to supply electrical energy generated from the battery module (102) to the aforementioned auxiliary module (110) and second module unit (200).

[0090] A low-voltage cable (30) is connected between the second module unit (200) and the power distributor (300), and a high-voltage cable (40) is connected between the battery module (102) and the power distributor (300). For reference, the high-voltage cable (40) is used to output 24V or higher power, and the low-voltage cable (30) is used to output 12V power.

[0091]

[0092] Referring to the attached FIGS. 5 and 6, the frame unit (103) is provided with a connection connector part (400) on its upper surface that electrically connects and disconnects the auxiliary module (110) and the power distributor (300).

[0093] The aforementioned low-voltage cable (30) extends upward from the rear outer side of the frame unit (103) toward an auxiliary module (110) positioned on the upper side of the frame unit (103).

[0094] The above low voltage cable (30) includes a first branch cable (32a) branched to the left according to the drawing and a second branch cable (32b) branched to the right in order to be connected to the connection connector part (400).

[0095] The first branch cable (32a) extends horizontally toward the left from the low-voltage cable (30), is connected to the connection connector part (400), and is positioned in the vertical direction according to the drawing. Additionally, the second branch cable (32b) branches toward the right side of the low-voltage cable (30), is connected to the connection connector part (400), and is positioned in the horizontal direction.

[0096] The first and second branch cables (32a, 32b) are not distributed to multiple locations via a plurality of connection connector parts (400) but are arranged to be concentrated at the rear upper side of the frame unit (103) as shown in the drawing, so that a worker can conveniently connect or disconnect the connection state of the connection connector parts (400).

[0097] In this case, when a worker intends to replace the battery module (102) mounted on the frame unit (103), the connection connector part (400) combined with the low-voltage cable (30) can be released in one place, thereby improving the worker's workability and enabling quick release.

[0098] In this case, the operator can quickly identify the electrical connection status of the connection connector part (400) combined with a plurality of low-voltage cables (30) connected to the heat exchange module (114) constituting the auxiliary module (110), the surge tank module (116), and the cooling water distribution module (118), and disconnect or reconnect it.

[0099] In particular, the connecting connector part (400) can be positioned adjacent to the rear of the excavator adjacent to the counterweight (3) so that the worker can remove it in one go.

[0100]

[0101] Referring to the attached FIG. 7, the present embodiment is provided with a first joint connector (80) connected to a cooling water line (20), and the first joint connector (80) is connected to a second joint connector (82) in the direction of an arrow so that the connection is completed. In addition, since the first joint connector (80) is separated from the second joint connector (82) in one go, inspection or replacement is easily performed.

[0102]

[0103] Referring to the attached FIGS. 8 to 11, a method for replacing a frame unit (103) equipped with a battery module (102) according to the present embodiment will be described.

[0104] In this embodiment, when inspection or replacement of the battery module (102) is required in the excavator, the entire frame unit (103) can be removed from the excavator using heavy equipment without individually separating multiple battery modules (102) from the inside of the frame unit (103). Then, the frame unit (103) equipped with a new battery module can be reinstalled in the excavator all at once.

[0105] In this case, the aforementioned auxiliary module (110) is also replaced with a new one while mounted on the frame unit (103).

[0106] In this case, the worker can replace the frame module (103) at once, which improves convenience and enables rapid replacement work, and simultaneously improves convenience associated with replacement. In particular, at work sites where excavators are used, rapid replacement of the frame module (203) can be very important, as delays in replacement can cause costs and work delays.

[0107] In this embodiment, to achieve this, the low-voltage cable (30) is first removed from the frame unit (103) equipped with the battery module (102), and then the high-voltage cable (40) is also removed.

[0108] Then, the cooling water line (20) shown in Fig. 4 is removed, and after removing the bonnet (11) located at the rear upper side of the excavator and covering the upper and rear sides of the frame unit (103), the counterweight (3) is also removed.

[0109] Referring to the attached FIG. 11, the frame unit (103) further includes a fixing part (103b) provided to selectively maintain a fixed state on the excavator. For example, a bolt is used for the fixing part (103b). When the frame unit (103) is fixed to the excavator, the fixing part (103b) can be locked to conveniently secure it.

[0110] In addition, when the frame unit (103) equipped with the battery module (102) is to be separated from the excavator, it can be easily separated from the excavator by releasing the fixed state of the fixed part (103b).

[0111] In this case, the additional task of a worker separating multiple battery modules (102) from the frame unit (103) one by one is omitted, allowing the frame unit (103) to be separated or installed quickly and conveniently.

[0112] The operator releases the connection state of the fixing part (103b) that fixes the excavator and the frame unit (103) to each other so that the frame unit (103) is separated from the excavator.

[0113] For reference, the above fixed part (103b) can be provided at the front and rear of the excavator, respectively.

[0114] Then, by using a separately provided heavy equipment to connect a steel wire to the towing bracket (103a) and moving the entire frame unit (103) equipped with the battery module (102) to the outside of the excavator through the heavy equipment, the entire frame unit (103) equipped with the battery module (102) and auxiliary module (110) is separated.

[0115] In addition, when reinstalling the frame unit equipped with the new battery module on the excavator using heavy equipment, the installation of the frame unit (103) is completed quickly by connecting a steel wire to the towing bracket (103a), moving it to the installation position of the excavator, and then fixing it using the fixing part (103b) before carrying out the subsequent work.

[0116]

[0117] Although an embodiment of the present invention has been described above, those skilled in the art may modify and change the present invention in various ways by adding, changing, deleting, or adding components, etc., without departing from the spirit of the present invention as described in the claims, and such modifications and changes are also to be included within the scope of the rights of the present invention.

[0118] These embodiments can increase work efficiency and improve operational capability through the easy attachment and detachment of a battery module equipped in an electric excavator.

Claims

1. A first module unit (100) comprising a plurality of battery modules (102) provided at the rear where a counterweight (3) is located relative to the driver's seat (2) of an excavator, and an auxiliary module (110) for cooling and heating the battery modules (102); and An electric construction machine comprising a second module unit (200) positioned in front of the first module unit (100).

2. In Paragraph 1, An electric construction machine in which the battery module (102) is maintained in a state of being seated inside a frame unit (103) having a predetermined volume, and the frame unit (103) is separated from the excavator while the battery module (102) is mounted.

3. In Paragraph 2, An electric construction machine in which a traction bracket (103a) is provided on the front and rear, respectively, when the direction facing the driver's seat (2) is defined as the front and the direction facing the counterweight (3) is defined as the rear.

4. In Paragraph 3, The above-described frame unit (103) further comprises a fixing part (103b) provided to selectively maintain a fixed state on the excavator, an electric construction machine.

5. In Paragraph 4, The above auxiliary module (110) is positioned on both the left and right sides of the upper surface of the frame unit (103) and further comprises a pair of cooling modules (112) provided to independently perform cooling and heating for the battery module (102).

6. In Paragraph 5, The above auxiliary module (110) is positioned adjacent to the cooling module (112) on the upper surface of the frame unit (103) to maintain the temperature of the battery module (102), and further includes a pair of heat exchange modules (114) that receive refrigerant from each other and perform heat exchange with the cooling module (112), an electric construction machine.

7. In Paragraph 6, The above heat exchange module (114) is an electric construction machine connected to a pair of surge tank modules (116) for removing moisture and air due to the phase change of the refrigerant.

8. In Paragraph 7, An electric construction machine having one end connected to the cooling module (112) and the other end connected to the heat exchange module (114), and equipped with a refrigerant line (10) for moving refrigerant.

9. In Paragraph 8, The above auxiliary module (110) further comprises a pair of cooling water distribution modules (118) configured such that the cooling water heat-exchanged in the heat exchange module (114) is distributed and supplied to each of the plurality of battery modules (102).

10. In Paragraph 9, An electric construction machine having a cooling water line (20) for supplying cooling water, one end of which is connected to the cooling water distribution module (118) and the other end of which is connected to a plurality of battery modules (102).

11. In Paragraph 2, An electric construction machine having a power distributor (300) disposed on the upper surface of the above frame unit (103) to receive electric energy generated from the battery module (102) and distribute it to the electric components equipped in the excavator.

12. In Paragraph 11, An electric construction machine in which a low-voltage cable (30) is connected between the second module unit (200) and the power distributor (300), and a high-voltage cable (40) is connected between the battery module (102) and the power distributor (300).

13. In Paragraph 12, An electric construction machine having a frame unit (103) equipped with a connection connector part (400) on the upper surface for electrically connecting and disconnecting between the auxiliary module (110) and the power distributor (300).

14. In Paragraph 2, The above frame unit (103) has a first converter (50) provided on its upper surface to convert high-voltage power generated from the battery module (102) into low-voltage power required by the excavator; An electric construction machine equipped with a second converter (60) that converts alternating current to direct current for charging the battery module (102).

15. In Paragraph 2, An electric construction machine having a water pump (70) installed on the upper surface of the above frame unit (103) to pressurize and supply cooling water to the above battery module (102).

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