CN219843030U - Liquid cooling heat dissipation system and engineering machinery - Google Patents

Abstract

The utility model belongs to the technical field of heat dissipation equipment, and discloses a liquid cooling heat dissipation system and engineering machinery, wherein the liquid cooling heat dissipation system comprises a refrigerant box and a plurality of first heat dissipation circulating pipes communicated with the refrigerant box, the first heat dissipation circulating pipes are arranged in one-to-one correspondence with battery pack groups of a battery heat management system, a plurality of battery packs on each battery pack group are communicated through corresponding first heat dissipation circulating pipes, a first exhaust three-way pipe is arranged on each first heat dissipation circulating pipe and comprises a first liquid inlet, a first liquid outlet and a first exhaust port which are communicated, the first exhaust three-way pipe is communicated with the first heat dissipation circulating pipe through the first liquid inlet and the first liquid outlet, and the first exhaust port can exhaust gas in the first heat dissipation circulating pipe; the engineering machinery comprises the liquid cooling heat dissipation system. The liquid cooling heat dissipation system and the engineering machinery provided by the utility model can effectively remove the gas in the heat dissipation pipeline in the battery heat management system, and ensure the effective heat dissipation of the battery pack and the reliable operation of the whole engineering machinery.

Description

Liquid cooling heat dissipation system and engineering machinery

Technical Field

The utility model relates to the technical field of heat dissipation equipment, in particular to a liquid cooling heat dissipation system and engineering machinery.

Background

In recent years, new energy electric mining engineering machinery is rapidly developed, and a battery is used as one of the whole vehicle power sources and plays a vital role in vehicle operation. The battery is influenced by the environmental temperature and the characteristics of the battery, and the mining engineering machinery needs to dissipate heat after long-time operation, so that the battery has certain requirements on a heat dissipation pipeline system, and particularly the problem of exhaust in the waterway circulation process is solved.

At present, the gas can enter the heat dissipation circulation pipeline after the mining engineering machinery just fills with the cooling liquid and runs for a period of time under the influence of different working conditions and the whole vehicle pipeline arrangement scheme, the gas is easy to leave bubbles after flowing through the battery pack in the waterway circulation process, and the common exhaust mode is not easy to exhaust, and the bubbles formed by the gas can block the battery pack to be fully contacted with the cooling liquid, so that the high temperature or the temperature difference of the battery system is overlarge, and the service life of the battery pack and the normal operation of the whole vehicle can be influenced finally.

Disclosure of Invention

The utility model aims to provide a liquid cooling heat dissipation system and engineering machinery, which can effectively remove gas in a heat dissipation pipeline in a battery heat management system and ensure effective heat dissipation and reliable operation of a battery pack.

To achieve the purpose, the utility model adopts the following technical scheme:

the liquid cooling heat dissipation system is used for dissipating heat of the battery thermal management system and comprises a battery assembly, wherein the battery assembly comprises a plurality of battery pack groups which are arranged in parallel, each battery pack group comprises a plurality of battery packs which are arranged in series, the liquid cooling heat dissipation system comprises a refrigerant box and a plurality of first heat dissipation circulating pipes which are communicated with the refrigerant box, the first heat dissipation circulating pipes are arranged in one-to-one correspondence with the battery pack groups, and a plurality of cooling liquid channels of the battery packs on each battery pack group are communicated through the corresponding first heat dissipation circulating pipes;

the first heat dissipation circulating pipe is provided with a first exhaust three-way pipe, the first exhaust three-way pipe comprises a first liquid inlet, a first liquid outlet and a first exhaust port which are mutually communicated, the first exhaust three-way pipe is communicated with the first heat dissipation circulating pipe through the first liquid inlet and the first liquid outlet, and the gas in the first heat dissipation circulating pipe is exhausted to the external environment through the first exhaust port.

Optionally, the battery pack further comprises a second heat dissipation circulating pipe, wherein one sides, close to the cooling liquid flowing out of the battery pack, of the first heat dissipation circulating pipes are communicated with the first ends of the second heat dissipation circulating pipes, the second ends of the second heat dissipation circulating pipes are communicated with the cooling liquid tank, and the second heat dissipation circulating pipes are provided with cooling liquid filtering devices.

Optionally, a second exhaust three-way pipe is arranged on the second heat dissipation circulating pipe, the second exhaust three-way pipe comprises a second liquid inlet, a second liquid outlet and a second exhaust port which are mutually communicated, the second exhaust three-way pipe is communicated with the second heat dissipation circulating pipe through the second liquid inlet and the second liquid outlet, and the gas in the second heat dissipation circulating pipe is exhausted to the external environment through the second exhaust port.

Optionally, the first exhaust port and the second exhaust port are both disposed upward along a vertical direction.

Optionally, the first exhaust three-way pipe is arranged at the highest position of the pipeline of the corresponding first heat dissipation circulating pipe.

Optionally, the device further comprises a converging exhaust piece, wherein the converging exhaust piece can converge the gases exhausted by the plurality of first exhaust ports and jointly exhaust the converged gases to the external environment.

Optionally, the number of the battery pack groups connected in parallel is three, each battery pack group comprises two battery packs arranged in series, the converging exhaust piece comprises a third exhaust three-way pipe and a fourth exhaust three-way pipe, the third exhaust three-way pipe comprises a first air inlet, a second air inlet and a third air outlet which are mutually communicated, and the fourth exhaust three-way pipe comprises a third air inlet, a fourth air inlet and a fourth air outlet which are mutually communicated;

the first exhaust ports of two of the three first exhaust three-way pipes are respectively communicated with the first air inlet and the second air inlet, the third exhaust port and the first exhaust port of the other of the three first exhaust three-way pipes are respectively communicated with the third air inlet and the fourth air inlet, and the fourth exhaust port is communicated with the external environment.

Optionally, the number of the battery pack groups connected in parallel is three, each battery pack group comprises two battery packs arranged in series, the converging exhaust piece comprises an exhaust four-way pipe, and the exhaust four-way pipe comprises a first air inlet, a second air inlet, a third air inlet and a third air outlet which are mutually communicated;

the first exhaust ports of the three first exhaust three-way pipes are respectively communicated with the first air inlet, the second air inlet and the third air inlet, and the third exhaust ports are communicated with the external environment.

Optionally, the battery pack further comprises a third heat dissipation circulating pipe, wherein one side, close to the flow of the cooling liquid, of the first heat dissipation circulating pipe is communicated with the first end of the third heat dissipation circulating pipe, the second end of the third heat dissipation circulating pipe is communicated with the refrigerant box, and the third heat dissipation circulating pipe is used for dissipating heat of a heat management unit in the battery heat management system.

An engineering machine comprising the liquid cooling heat dissipation system of any one of the above.

The beneficial effects are that:

when the liquid cooling heat dissipation system dissipates heat of the battery heat management system of the engineering machinery, the cooling liquid flows out of the refrigerant box and flows into the plurality of first heat dissipation circulating pipes. Specifically, the cooling liquid in each first heat dissipation circulating pipe sequentially flows through the cooling liquid channel of the battery pack communicated with the first heat dissipation circulating pipe, so that the battery pack is reliably and effectively cooled, and through the arrangement of the first exhaust three-way pipe on the first heat dissipation circulating pipe, when the gas doped in the cooling liquid in the first heat dissipation circulating pipe flows through the first exhaust three-way pipe along with the cooling liquid, the cooling liquid in the first heat dissipation circulating pipe flows through the first exhaust three-way pipe through the first liquid inlet and the first liquid outlet, and then the gas in the first heat dissipation circulating pipe can be discharged to the external environment through the first air outlet, so that the gas in the first heat dissipation circulating pipe can be effectively discharged, the formation of bubbles to prevent the battery pack from being fully contacted with the cooling liquid, the reliable heat dissipation of the battery pack can be effectively ensured, and the reliable operation of engineering machinery can be effectively ensured.

Drawings

FIG. 1 is a schematic diagram of a liquid-cooled heat dissipation system according to an embodiment of the present utility model;

FIG. 2 is an enlarged view of a portion of the present utility model at A in FIG. 1;

FIG. 3 is a schematic diagram of a liquid-cooled heat dissipation system according to another embodiment of the present utility model;

fig. 4 is a partial enlarged view of the present utility model at B in fig. 3.

In the figure:

110. a refrigerant box; 120. a first heat-dissipating circulation pipe; 130. a first exhaust tee; 131. a first liquid inlet; 132. a first liquid outlet; 133. a first exhaust port; 140. a second heat-dissipating circulation pipe; 150. a cooling liquid filtering device; 160. a second exhaust tee; 161. a second liquid inlet; 162. a second liquid outlet; 163. a second exhaust port; 171. a third exhaust tee; 1711. a first air inlet; 1712. a second air inlet; 1713. a third exhaust port; 172. a fourth exhaust tee; 1721. a third air inlet; 1722. a fourth air inlet; 1723. a fourth exhaust port; 180. an exhaust four-way pipe; 181. a fifth air inlet; 182. a sixth air inlet; 183. a seventh air inlet; 184. a fifth exhaust port; 190. a third heat-dissipating circulation pipe;

210. a battery pack; 220. a thermal management unit; 230. a heating device.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Referring to fig. 1 to 2, the present embodiment provides a construction machine, which includes a battery thermal management system including a battery assembly including a plurality of battery pack groups disposed in parallel, each of the battery pack groups including a plurality of battery packs 210 disposed in series. The engineering machine further comprises a liquid cooling heat dissipation system for dissipating heat of the battery heat management system. The liquid cooling heat dissipation system comprises a refrigerant box 110 and a plurality of first heat dissipation circulating pipes 120 communicated with the refrigerant box 110, the first heat dissipation circulating pipes 120 are arranged in one-to-one correspondence with the battery pack groups, the cooling liquid channels of a plurality of battery packs 210 on each battery pack group are communicated through corresponding first heat dissipation circulating pipes 120, a first exhaust three-way pipe 130 is arranged on each first heat dissipation circulating pipe 120, each first exhaust three-way pipe 130 comprises a first liquid inlet 131, a first liquid outlet 132 and a first exhaust outlet 133 which are mutually communicated, each first exhaust three-way pipe 130 is communicated with the corresponding first heat dissipation circulating pipe 120 through the corresponding first liquid inlet 131 and the corresponding first liquid outlet 132, and the gas in each first heat dissipation circulating pipe 120 is exhausted to the external environment through the corresponding first exhaust outlet 133.

In the present embodiment, when the liquid cooling heat dissipation system dissipates heat of the battery thermal management system of the construction machine, the cooling liquid flows out from the refrigerant tank 110 and flows into the plurality of first heat dissipation circulation pipes 120. Specifically, the cooling liquid in each first heat dissipation circulation pipe 120 sequentially flows through the cooling liquid channel of the battery pack 210 communicated with the first heat dissipation circulation pipe 120, so that the battery pack 210 is reliably and effectively cooled, and by arranging the first exhaust three-way pipe 130 on the first heat dissipation circulation pipe 120, when the gas doped in the cooling liquid in the first heat dissipation circulation pipe 120 flows through the first exhaust three-way pipe 130 along with the cooling liquid, the cooling liquid in the first heat dissipation circulation pipe 120 flows through the first exhaust three-way pipe 130 through the first liquid inlet 131 and the first liquid outlet 132, and then the gas in the first heat dissipation circulation pipe 120 can be discharged to the external environment through the first air outlet 133, so that the gas in the first heat dissipation circulation pipe 120 can be effectively discharged, the formation of bubbles of the gas is avoided to block the battery pack 210 from being fully contacted with the cooling liquid, the reliable heat dissipation of the battery pack 210 is effectively ensured, and the reliable operation of the engineering machinery is effectively ensured.

In this embodiment, the liquid cooling heat dissipation system further includes a second heat dissipation circulation pipe 140, wherein one side of the plurality of first heat dissipation circulation pipes 120, which is close to the side of the battery pack 210, is communicated with a first end of the second heat dissipation circulation pipe 140, a second end of the second heat dissipation circulation pipe 140 is communicated with the refrigerant tank 110, and a cooling liquid filtering device 150 is disposed on the second heat dissipation circulation pipe 140. In this embodiment, the cooling liquid filtering device 150 is configured to reliably and effectively filter the cooling liquid flowing in a circulating manner, so as to ensure the quality of the cooling liquid and avoid excessive impurities in the cooling liquid from affecting the cooling effect.

Further, the second heat dissipation circulation pipe 140 is provided with a second exhaust three-way pipe 160, the second exhaust three-way pipe 160 includes a second liquid inlet 161, a second liquid outlet 162 and a second air outlet 163 which are mutually communicated, the second exhaust three-way pipe 160 is communicated with the second heat dissipation circulation pipe 140 through the second liquid inlet 161 and the second liquid outlet 162, and the air in the second heat dissipation circulation pipe 140 is discharged to the external environment through the second air outlet 163. In this embodiment, the second exhaust three-way pipe 160 is disposed on the second heat dissipation circulation pipe 140, so that part of the gas in the second heat dissipation circulation pipe can be effectively removed. Specifically, when the gas doped in the cooling liquid in the second heat dissipation circulation pipe 140 flows through the second exhaust three-way pipe 160 together with the cooling liquid, the cooling liquid in the second heat dissipation circulation pipe 140 flows through the second exhaust three-way pipe 160 through the second liquid inlet 161 and the second liquid outlet 162, and the gas in the second heat dissipation circulation pipe 140 can be discharged to the external environment through the second air outlet 163.

Specifically, the first exhaust port 133 and the second exhaust port 163 are each disposed upward in the vertical direction. With this arrangement, the gas in the first and second heat dissipation circulation pipes 120 and 140 can be further effectively exhausted.

Specifically, the first exhaust three-way pipe 130 is disposed at the highest position of the corresponding first heat dissipation circulation pipe 120. Since the gas in the first heat dissipation circulation pipe 120 is heated and generally moves upwards, the first exhaust three-way pipe 130 is arranged at the highest position of the corresponding pipeline of the first heat dissipation circulation pipe 120, so that the gas in the first heat dissipation circulation pipe 120 can be more reliably and effectively fully exhausted.

Further, the liquid cooling heat dissipation system provided in this embodiment further includes a third heat dissipation circulation pipe 190, wherein one side of the plurality of first heat dissipation circulation pipes 120, which is close to the side where the cooling liquid flows into the battery pack 210, is all connected to a first end of the third heat dissipation circulation pipe 190, a second end of the third heat dissipation circulation pipe 190 is connected to the refrigerant box 110, and the third heat dissipation circulation pipe 190 is used for dissipating heat of the thermal management unit 220 in the battery thermal management system. Specifically, a coolant flow channel is also disposed in the thermal management unit 220, and the coolant flow channel may be connected to the third heat dissipation circulation pipe 190, so that the coolant flows through the coolant flow channel, and thus, the thermal management unit 220 dissipates heat reliably.

In this embodiment, the battery thermal management system is further provided with a heating device 230 between the thermal management unit 220 and the cooling liquid inlet end of the battery pack 210, and the third heat dissipation circulation pipe 190 can also cool and dissipate heat from the heating device 230.

In this embodiment, as shown in fig. 1 to 2, the liquid cooling heat dissipation system further includes a converging exhaust member, and the converging exhaust member can converge the gases exhausted from the plurality of first exhaust ports 133 and jointly exhaust the converged gases to the external environment. The gas discharged from the plurality of first exhaust ports 133 can be collected by the collection and exhaust member, and the gas can be discharged uniformly.

In the present embodiment, the number of parallel battery pack groups is set to three, and each battery pack group includes two battery packs 210 arranged in series. The confluence exhaust member includes a third exhaust three-way pipe 171 and a fourth exhaust three-way pipe 172, the third exhaust three-way pipe 171 includes a first intake port 1711, a second intake port 1712 and a third exhaust port 1713 which are communicated with each other, the fourth exhaust three-way pipe 172 includes a third intake port 1721, a fourth intake port 1722 and a fourth exhaust port 1723 which are communicated with each other, the first exhaust ports 133 of two of the three first exhaust three-way pipes 130 are respectively communicated with the first intake port 1711 and the second intake port 1712, the third exhaust port 1713 and the first exhaust ports 133 of the other of the three first exhaust three-way pipes 130 are respectively communicated with the third intake port 1721 and the fourth intake port 1722, and the fourth exhaust port 1723 is communicated with the external environment.

Specifically, when the exhaust is performed, the first exhaust ports 133 of two of the three first exhaust three-way pipes 130 are respectively communicated with the first air inlet 1711 and the second air inlet 1712, and the air in the two first exhaust three-way pipes 130 can enter the third exhaust three-way pipe 171 through the first air inlet 1711 and the second air inlet 1712 and then enter the fourth exhaust three-way pipe 172 through the third exhaust outlet 1713 and the third air inlet 1721; the remaining gas in the first exhaust three-way pipe 130 enters the fourth exhaust three-way pipe 172 through the fourth air inlet 1722, and finally passes through the fourth air outlet 1723 to uniformly discharge the gas in the fourth exhaust three-way pipe 172 to the external environment.

In the present embodiment, the refrigerant tank 110 is provided as an expansion tank, and the cooling liquid is provided as cooling water. The expansion tank is provided with an overflow pipe communicating with the external environment, and the second exhaust port 163 and the fourth exhaust port 1723 are preferably communicated with the overflow pipe through an external gas pipe, so that gas can be introduced into the overflow pipe and exhausted to the external environment through the overflow pipe.

As an alternative embodiment, referring to fig. 3 to 4, the confluence exhaust member includes an exhaust four-way pipe 180, the exhaust four-way pipe 180 includes a fifth air inlet 181, a sixth air inlet 182, a seventh air inlet 183, and a fifth air outlet 184 that communicate with each other, and the first air outlets 133 of the three first exhaust three-way pipes 130 communicate with the fifth air inlet 181, the sixth air inlet 182, and the seventh air inlet 183, respectively, and the fifth air outlet 184 communicates with the external environment.

Specifically, when the exhaust is performed, the first exhaust ports 133 of the three first exhaust three-way pipes 130 are respectively communicated with the fifth air inlet 181, the sixth air inlet 182 and the seventh air inlet 183, and the air in the three first exhaust three-way pipes 130 can enter the exhaust four-way pipe 180 through the fifth air inlet 181, the sixth air inlet 182 and the seventh air inlet 183, and then be uniformly discharged to the external environment through the fifth exhaust port 184.

The present embodiment is not limited thereto, and different types and different numbers of air inlets of the exhaust multi-way pipe can be selected according to the number and the connection manner of the battery packs 210, which is not limited thereto.

It should be noted that, the specific structures of the exhaust three-way pipe and the exhaust four-way pipe 180 are all in the prior art, and are not described herein in detail.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. A liquid cooling heat dissipation system for dissipating heat of a battery thermal management system, the battery thermal management system comprising a battery assembly, the battery assembly comprising a plurality of battery pack groups arranged in parallel, each battery pack group comprising a plurality of battery packs (210) arranged in series, the liquid cooling heat dissipation system comprising a refrigerant tank (110) and a plurality of first heat dissipation circulation pipes (120) communicated with the refrigerant tank (110), the first heat dissipation circulation pipes (120) being arranged in one-to-one correspondence with the battery pack groups, a plurality of cooling liquid channels of the battery packs (210) on each battery pack group being communicated through the corresponding first heat dissipation circulation pipes (120);

be provided with first exhaust three-way pipe (130) on first heat dissipation circulating pipe (120), first exhaust three-way pipe (130) are including first inlet (131), first liquid outlet (132) and first gas vent (133) of intercommunication each other, first exhaust three-way pipe (130) pass through first inlet (131) with first liquid outlet (132) communicate in on first heat dissipation circulating pipe (120), pass through first gas vent (133) will gaseous discharge in first heat dissipation circulating pipe (120) is to external environment.

2. The liquid cooling and heat dissipating system according to claim 1, further comprising a second heat dissipating circulating pipe (140), wherein a plurality of the first heat dissipating circulating pipes (120) are connected to a first end of the second heat dissipating circulating pipe (140) near a side of the battery pack (210) from which the coolant flows, a second end of the second heat dissipating circulating pipe (140) is connected to the coolant tank (110), and a coolant filtering device (150) is disposed on the second heat dissipating circulating pipe (140).

3. The liquid cooling and heat dissipating system according to claim 2, wherein a second exhaust three-way pipe (160) is disposed on the second heat dissipating circulating pipe (140), the second exhaust three-way pipe (160) includes a second liquid inlet (161), a second liquid outlet (162) and a second air outlet (163) that are mutually communicated, the second exhaust three-way pipe (160) is communicated with the second heat dissipating circulating pipe (140) through the second liquid inlet (161) and the second liquid outlet (162), and the air in the second heat dissipating circulating pipe (140) is exhausted to the external environment through the second air outlet (163).

4. A liquid-cooled heat dissipating system according to claim 3, wherein the first exhaust port (133) and the second exhaust port (163) are each disposed upward in a vertical direction.

5. The liquid-cooled heat dissipating system according to claim 1, wherein the first exhaust tee (130) is disposed at a highest position of the corresponding first heat dissipating circulation pipe (120).

6. The liquid-cooled heat dissipating system according to claim 1, further comprising a confluence exhaust member that can confluence the gases discharged from the plurality of first exhaust ports (133) and commonly discharge the converged gases to the outside environment.

7. The liquid-cooled heat dissipation system of claim 6, wherein the number of parallel battery pack groups is set to three, each battery pack group comprises two battery packs (210) arranged in series, the converging exhaust member comprises a third exhaust tee (171) and a fourth exhaust tee (172), the third exhaust tee (171) comprises a first air inlet (1711), a second air inlet (1712) and a third air outlet (1713) which are communicated with each other, and the fourth exhaust tee (172) comprises a third air inlet (1721), a fourth air inlet (1722) and a fourth air outlet (1723) which are communicated with each other;

the first exhaust ports (133) of two of the three first exhaust three-way pipes (130) are respectively communicated with the first air inlet (1711) and the second air inlet (1712), the third exhaust port (1713) and the first exhaust port (133) of the other of the three first exhaust three-way pipes (130) are respectively communicated with the third air inlet (1721) and the fourth air inlet (1722), and the fourth exhaust port (1723) is communicated with the external environment.

8. The liquid-cooled heat dissipation system of claim 6, wherein the number of parallel battery pack groups is three, each battery pack group comprises two battery packs (210) arranged in series, the converging exhaust member comprises an exhaust four-way pipe (180), and the exhaust four-way pipe (180) comprises a fifth air inlet (181), a sixth air inlet (182), a seventh air inlet (183) and a fifth air outlet (184) which are communicated with each other;

the first exhaust ports (133) of the three first exhaust three-way pipes (130) are respectively communicated with the fifth air inlet (181), the sixth air inlet (182) and the seventh air inlet (183), and the fifth exhaust ports (184) are communicated with the external environment.

9. The liquid cooling and heat dissipating system according to claim 1, further comprising a third heat dissipating circulation pipe (190), wherein a plurality of the first heat dissipating circulation pipes (120) are connected to a first end of the third heat dissipating circulation pipe (190) near a side where the cooling liquid flows into the battery pack (210), a second end of the third heat dissipating circulation pipe (190) is connected to the refrigerant tank (110), and the third heat dissipating circulation pipe (190) is used for dissipating heat of a thermal management unit (220) in the battery thermal management system.

10. A construction machine comprising the liquid-cooled heat dissipation system according to any one of claims 1 to 9.