Integrated battery pack and electric construction machine
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGXI LIUGONG METATHINGS TECHNOLOGY CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-06-26
Smart Images
Figure CN224417837U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electric engineering machinery equipment technology, and in particular to an integrated battery pack and electric engineering machinery. Background Technology
[0002] Currently, the batteries of electric construction machinery are cooled by water during charging or discharging. The low-temperature refrigerant from the vehicle's air conditioning system is used to exchange heat in a plate heat exchanger to remove the heat from the circulating water circuit.
[0003] However, in practical applications, when swapping batteries, the battery pack is separated from the engineering machinery and hoisted into the charging base for charging. It is cooled by the water-cooling unit of the base. Since the water-cooling unit of the charging base is located at a low position, it is easy for air bubbles in the battery cooling circulation water circuit to be unable to be discharged, resulting in poor degassing of the cooling circulation water circuit. The air resistance of the electronic water pump is easy to blockage, which in turn affects the heat exchange capacity of the battery pack.
[0004] Therefore, how to design a battery pack that can improve the degassing function of the battery cooling circulation water circuit to enhance the heat exchange capacity of the battery pack has become an urgent problem to be solved. Utility Model Content
[0005] This utility model discloses an integrated battery pack and electric engineering machinery, which can improve the degassing function of the battery cooling circulating water circuit, thereby improving the heat exchange capacity of the battery pack.
[0006] To achieve the above objectives, in a first aspect, this utility model discloses an integrated battery pack, comprising:
[0007] Battery pack body;
[0008] A cooling water circulation channel is provided on the outer wall of the battery pack body, and the cooling water circulation channel is used to cool the battery pack body;
[0009] An expansion tank is located at the highest horizontal position of the battery pack body. The first end of the expansion tank has a degassing port, which is connected to the main outlet water pipe of the cooling circulation water circuit. The expansion tank is used to degas the cooling circulation water circuit through the degassing port.
[0010] As an optional implementation, in an embodiment of the first aspect of this utility model, the second end of the expansion tank has a water inlet, which is connected to the main water inlet of the cooling circulation water circuit. The expansion tank is used to replenish water to the cooling circulation water circuit through the water inlet; wherein, the first end and the second end are opposite ends on the expansion tank.
[0011] As an optional implementation, in an embodiment of the first aspect of this utility model, the expansion tank has a target water cavity inside, and the target water cavity is provided with a labyrinthine partition to divide the target water cavity into multiple sub-water cavities.
[0012] As an optional implementation, in an embodiment of the first aspect of this utility model, the sub-water chamber includes a first water chamber, a second water chamber, and a third water chamber, wherein the first water chamber is connected to the degassing port and the second water chamber, and the third water chamber is connected to the water inlet and the second water chamber.
[0013] As an optional implementation, in an embodiment of the first aspect of this utility model, the expansion tank further includes a filling port and a filling cap, the filling port being connected to the first water cavity, and the filling cap being used to seal the filling port.
[0014] As an optional implementation, in an embodiment of the first aspect of this utility model, the filling cap includes: a filling cap body, a positive pressure valve, and a negative pressure valve. The filling cap body is used to seal the filling port, the positive pressure valve is used to pressurize the target water cavity, and the negative pressure valve is used to depressurize the target water cavity.
[0015] As an optional implementation, in the embodiment of the first aspect of this utility model, the number of degassing ports is two, and the two degassing ports are arranged parallel to each other and adjacent to each other.
[0016] Secondly, this utility model discloses an electric engineering machinery, which includes:
[0017] Construction machinery body;
[0018] The integrated battery pack as described in the first aspect of this utility model is mounted on the main body of the engineering machinery.
[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0020] The integrated battery pack provided by this utility model degassing the cooling circulation water circuit through an expansion tank located at the highest horizontal level of the battery pack body, thereby expelling the air in the cooling circulation water circuit from the system. This enables the degassing function of the cooling circulation water circuit in the battery pack during battery swapping to be realized even when the water-cooled unit is located at a lower position on the vehicle end or charging base end, thereby improving the heat exchange capacity of the battery pack.
[0021] The electric engineering machinery provided by this utility model adopts the above-mentioned integrated battery pack. The expansion tank set at the highest horizontal position of the battery pack body degassing of the cooling circulation water circuit and exhausting the air in the cooling circulation water circuit out of the system. This enables the degassing function of the cooling circulation water circuit in the battery pack to be used for battery swapping when the water-cooled unit is set at a low position at the vehicle end or charging base end, thereby improving the heat exchange capacity of the battery pack. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the integrated battery pack in this utility model;
[0023] Figure 2 This is a schematic diagram of a specific embodiment of the integrated battery pack in this utility model;
[0024] Figure 3 This is a cross-sectional view of a specific embodiment of the expansion tank in this utility model.
[0025] The meanings of the reference numerals in the attached figures are as follows:
[0026] Battery pack body 100, cooling circulation water circuit 200, expansion tank 300, degassing port 310, water inlet 320, target water chamber 330, first water chamber 331, second water chamber 332, third water chamber 333, labyrinth partition 340, filling port 350, filling cap 360. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0028] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0029] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.
[0030] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.
[0031] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.
[0032] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.
[0033] Currently, the batteries of electric construction machinery are cooled by water during charging or discharging. The low-temperature refrigerant from the vehicle's air conditioning system is used to exchange heat in a plate heat exchanger to remove the heat from the circulating water circuit.
[0034] However, in practical applications, when swapping batteries, the battery pack is separated from the engineering machinery and hoisted into the charging base for charging. It is cooled by the water-cooling unit of the base. Since the water-cooling unit of the charging base is located at a low position, it is easy for air bubbles in the battery cooling circulation water circuit to be unable to be discharged, resulting in poor degassing of the cooling circulation water circuit. The air resistance of the electronic water pump is easy to blockage, which in turn affects the heat exchange capacity of the battery pack.
[0035] Therefore, how to design a battery pack that can improve the degassing function of the battery cooling circulation water circuit to enhance the heat exchange capacity of the battery pack has become an urgent problem to be solved.
[0036] In response, this utility model discloses an integrated battery pack and electric engineering machinery that can improve the degassing function of the battery cooling circulating water circuit, thereby improving the heat exchange capacity of the battery pack.
[0037] like Figure 1 , Figure 2As shown, this utility model discloses an integrated battery pack, which includes: a battery pack body 100, a cooling circulation water channel 200, and an expansion tank 300. The cooling circulation water channel 200 is disposed on the outer wall of the battery pack body 100 and is used to cool the battery pack body 100. The expansion tank 300 is disposed at the highest horizontal position of the battery pack body 100. The first end of the expansion tank 300 has a degassing port 310, which is connected to the main outlet water channel of the cooling circulation water channel 200. The expansion tank 300 is used to degas the cooling circulation water channel 200 through the degassing port 310.
[0038] In this embodiment, the battery pack body 100 can be formed by stacking multiple layers of boxes. The battery pack body 100 can be installed on electric construction machinery such as electric excavators to provide working power for the electric construction machinery. The battery pack body 100 can be a high-capacity battery pack with a capacity of 282 kWh or more.
[0039] Reference Figure 1 and Figure 2 The outer wall of the battery pack body 100 is provided with a cooling circulation water channel 200. The cooling circulation water channel 200 is equipped with a water cooling device such as a cooler. The water cooling device can cover the outer wall surface of the battery pack body 100. The cooling circulation water channel 200 circulates the coolant of the water cooling device to achieve the cooling function of the battery pack body 100, thereby maintaining the battery pack body 100 at an ideal operating temperature.
[0040] The expansion tank 300 is located at the highest point of the battery pack body 100 when it is placed horizontally (e.g., Figure 1 The expansion tank 300 has a degassing port 310 on its side at the top end of the battery pack body 100. This degassing port 310 can be connected to the main outlet pipe of the cooling circulating water circuit 200 via a degassing hose. The expansion tank 300 can discharge air accumulated at a high level in the cooling circulating water circuit 200 to the outside of the cooling circulating water circuit 200 through the degassing port 310, thereby achieving the degassing function of the cooling circulating water circuit 200 and ensuring the smooth flow of coolant in the cooling circulating water circuit 200. At the same time, since the water level determines the static pressure of the cooling circulating water circuit 200 system, by setting the expansion tank 300 at the highest horizontal level of the battery pack body 100, it is possible to prevent negative pressure suction at the water pump inlet of the cooling circulating water circuit 200, thus improving the reliability of the cooling circulating water circuit 200 system.
[0041] As can be seen, the integrated battery pack of this utility model can degas the cooling circulation water path 200 through the expansion tank 300 located at the highest horizontal level of the battery pack body 100, and discharge the air in the cooling circulation water path 200 out of the system. This enables the degassing function of the cooling circulation water path 200 in the battery pack to be achieved even when the water-cooled unit is located at a lower position at the vehicle end or charging base end, thereby improving the heat exchange capacity of the battery pack.
[0042] like Figure 1 , Figure 2 As shown, in an optional embodiment, the second end of the expansion tank 300 has a water inlet 320, which is connected to the main water inlet of the cooling circulation water circuit 200. The expansion tank 300 is used to replenish water to the cooling circulation water circuit 200 through the water inlet 320. The first end and the second end are opposite ends on the expansion tank 300.
[0043] In this optional embodiment, refer to Figure 1 , Figure 2 The expansion tank 300 has a water inlet 320 on its bottom surface at the second lower end. This water inlet 320 can be connected to the main water inlet pipe of the cooling circulation water circuit 200 via a water inlet hose. When the system pressure of the cooling circulation water circuit 200 drops, the expansion tank 300 can replenish the cooling circulation water circuit 200 with the pre-stored coolant through the water inlet 320, thereby maintaining the dynamic balance of the system pressure of the cooling circulation water circuit 200.
[0044] As can be seen, this optional embodiment can also replenish the cooling circulation water path 200 by opening a water inlet 320 on the bottom surface of the second end of the expansion tank 300, thereby maintaining the dynamic balance of the system pressure of the cooling circulation water path 200 and improving the cooling efficiency of the cooling circulation water path 200 on the battery pack body 100.
[0045] like Figure 3 As shown, in an optional embodiment, the expansion tank 300 has a target water cavity 330 inside, and the target water cavity 330 is provided with a labyrinthine partition 340 to divide the target water cavity 330 into multiple sub-water cavities.
[0046] In this optional embodiment, refer to Figure 3 The target water chamber 330 inside the expansion tank 300 can store coolant. The target water chamber 330 is equipped with a labyrinth-type baffle 340, which divides the target water chamber 330 into multiple sub-water chambers. When the electric construction machinery vibrates during operation, the labyrinth-type baffle 340 can effectively reduce the sloshing of coolant in the target water chamber 330.
[0047] As can be seen, this optional embodiment can also prevent the coolant level in the target water cavity 330 from swaying significantly when the electric engineering machinery vibrates during operation by setting a labyrinth-type baffle 340 in the target water cavity 330, thereby avoiding the expansion tank 300's degassing port 310 from being blocked by coolant and affecting degassing performance.
[0048] like Figure 3 As shown, in an optional embodiment, the sub-water chamber includes a first water chamber 331, a second water chamber 332, and a third water chamber 333. The first water chamber 331 is connected to the degassing port 310 and the second water chamber 332, respectively, and the third water chamber 333 is connected to the water supply port 320 and the second water chamber 332, respectively.
[0049] In this optional embodiment, refer to Figure 3 The labyrinthine partition 340 divides the target water chamber 330 into a first water chamber 331, a second water chamber 332, and a third water chamber 333. The first water chamber 331 is located in the upper part of the expansion tank 300, the second water chamber 332 is located in the middle part of the expansion tank 300, and the third water chamber 333 is located in the lower part of the expansion tank 300. The left side of the first water chamber 331 communicates with the degassing port 310, and the partition between the first water chamber 331 and the second water chamber 332 has an opening, allowing them to communicate. The bottom of the third water chamber 333 communicates with the water inlet 320, and the partition between the third water chamber 333 and the second water chamber 332 also has an opening, allowing them to communicate. The middle part of the second water chamber 332 is further equipped with a partition to further reduce the sloshing of the coolant within it.
[0050] like Figure 3 As shown, in an optional embodiment, the expansion tank 300 further includes a filling port 350 and a filling cap 360, the filling port 350 being connected to the first water chamber 331, and the filling cap 360 being used to seal the filling port 350.
[0051] In this optional embodiment, refer to Figure 3 The expansion tank 300 has a filling port 350 on its upper side, which is sealed by a filling cap 360. When replacing the battery pack, coolant leakage is inevitable. When the coolant level in the expansion tank 300 is insufficient, coolant can be added to the expansion tank 300 through the filling port 350.
[0052] As can be seen, this optional embodiment can also replenish the expansion tank 300 with coolant through the filling port 350 when the coolant is insufficient, thereby enabling timely replenishment of coolant and avoiding the problem of overheating of the battery pack body 100 during charging due to insufficient coolant in the cooling circulation water circuit 200 and the expansion tank 300.
[0053] In an optional embodiment, the filling cap 360 includes: a filling cap 360 body, a positive pressure valve, and a negative pressure valve. The filling cap 360 body is used to seal the filling port 350, the positive pressure valve is used to pressurize the target water chamber 330, and the negative pressure valve is used to depressurize the target water chamber 330.
[0054] In this optional embodiment, the filling cap 360 is equipped with a positive pressure valve and a negative pressure valve. The positive pressure valve can increase the pressure of the target water chamber 330 inside the expansion tank 300, and the negative pressure valve can decrease the pressure of the target water chamber 330 inside the expansion tank 300. For example, in a specific embodiment, the positive pressure valve can increase the pressure by 90 kPa when activated, and the negative pressure valve can decrease the pressure by 5 kPa when activated. Therefore, this optional embodiment can also achieve controllable adjustment of the pressure of the target water chamber 330 inside the expansion tank 300 through the positive and negative pressure valves.
[0055] like Figure 3 As shown, in an optional embodiment, the number of degassing ports 310 is two, and the two degassing ports 310 are arranged parallel to each other and adjacent to each other.
[0056] In this optional embodiment, refer to Figure 3 The expansion tank 300 is provided with two degassing ports 310 that are parallel to each other in the vertical direction. When the liquid level of the coolant in the target water chamber 330 is shaken, the upper degassing port 310 is unlikely to be blocked by the coolant, thus preventing all degassing ports 310 from being blocked by the coolant and affecting the degassing function.
[0057] This utility model also discloses an electric engineering machinery, which includes an electric engineering machinery body and an integrated battery pack as described in the above embodiments of this utility model, wherein the integrated battery pack is installed on the electric engineering machinery body.
[0058] As can be seen, in this embodiment, the electric construction machinery can use the above-mentioned integrated battery pack to degas the cooling circulation water path 200 through the expansion tank 300 located at the highest horizontal level of the battery pack body 100, thereby expelling the air in the cooling circulation water path 200 from the system. This enables the degassing function of the cooling circulation water path 200 in the battery pack to be used for battery swapping when the water-cooled unit is located at a lower position at the vehicle end or charging base end, thereby improving the heat exchange capacity of the battery pack.
[0059] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.
Claims
1. An integrated battery pack, characterized in that, include: Battery pack body; A cooling water circulation channel is provided on the outer wall of the battery pack body, and the cooling water circulation channel is used to cool the battery pack body; An expansion tank is located at the highest horizontal position of the battery pack body. The first end of the expansion tank has a degassing port, which is connected to the main outlet water pipe of the cooling circulation water circuit. The expansion tank is used to degas the cooling circulation water circuit through the degassing port.
2. The integrated battery pack according to claim 1, characterized in that, The expansion tank has a water inlet at its second end, which is connected to the main water inlet of the cooling circulation water circuit. The expansion tank is used to replenish water to the cooling circulation water circuit through the water inlet. The first end and the second end are opposite ends of the expansion tank.
3. The integrated battery pack according to claim 2, characterized in that, The expansion tank has a target water cavity inside, and the target water cavity is provided with a labyrinthine partition to divide the target water cavity into multiple sub-water cavities.
4. The integrated battery pack according to claim 3, characterized in that, The sub-water chamber includes a first water chamber, a second water chamber, and a third water chamber. The first water chamber is connected to the degassing port and the second water chamber, respectively, and the third water chamber is connected to the water inlet and the second water chamber, respectively.
5. The integrated battery pack according to claim 4, characterized in that, The expansion tank also has a filling port and a filling cap. The filling port is connected to the first water cavity, and the filling cap is used to seal the filling port.
6. The integrated battery pack according to claim 5, characterized in that, The filling cap includes a filling cap body, a positive pressure valve, and a negative pressure valve. The filling cap body is used to seal the filling port, the positive pressure valve is used to pressurize the target water cavity, and the negative pressure valve is used to depressurize the target water cavity.
7. The integrated battery pack according to any one of claims 1 to 6, characterized in that, The number of degassing ports is two, and the two degassing ports are arranged parallel to each other and adjacent to each other.
8. An electric engineering machine, characterized in that, include: Construction machinery body; The integrated battery pack as described in any one of claims 1 to 7 is mounted on the main body of the engineering machinery.