New energy commercial vehicle battery packs and electric vehicles

Abstract

The embodiments of the present invention relate to the field of battery heat dissipation technology, and more specifically, to a new energy commercial vehicle battery pack and an electric vehicle. The new energy commercial vehicle battery pack includes a box body, a liquid cooling assembly with multiple liquid cooling plates, a sealing ring, a closure, multiple busbars and multiple battery modules. The box body includes a receiving cavity with an opening, the liquid cooling assembly is arranged in the receiving cavity, each battery module is fixedly attached to each liquid cooling plate, each busbar is staggered between multiple battery modules, each busbar is electrically connected to every two battery modules to form a module structure with two free ends, the sealing ring is arranged at the edge of the opening, and the closure is buckled at a position where the sealing ring is away from the edge of the opening. The new energy commercial vehicle battery pack can perform local targeted thermal management on the battery and improve the thermal management effect.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of battery heat dissipation technology, and in particular, to a new energy commercial vehicle battery pack and an electric vehicle. Background Art

[0002] As an important component of new energy electric vehicles, the performance of the battery pack directly determines whether the new energy electric vehicle can operate normally and safely. During the operation of the battery pack, the battery will generate heat. If the temperature is too high, it may affect the normal operation of the battery module or even damage the battery module. Most of the existing technologies for thermal management of batteries are not effective. Summary of the invention

[0003] In view of this, the present invention provides a new energy commercial vehicle battery pack and an electric vehicle, which can achieve local targeted thermal management of the battery and improve the effect of thermal management.

[0004] To achieve the above-mentioned purpose, an embodiment of the present invention provides a new energy commercial vehicle battery pack, comprising: a box body, a liquid cooling assembly having a plurality of liquid cooling plates, a sealing ring, a closure, a plurality of busbars and a plurality of battery modules;

[0005] The first side of the box body is provided with a regulating liquid interaction part and a first battery interface, the second side of the box body is provided with a second battery interface, and the first side and the second side face each other; the box body includes a receiving cavity with an opening;

[0006] The liquid cooling component is arranged in the accommodating cavity and fixed to the bottom side of the box body, the liquid cooling component is a hollow structure, and the liquid cooling component is connected to the regulating liquid interaction part; each battery module is accommodated in the accommodating cavity and fixedly attached to a position of each liquid cooling plate away from the bottom side;

[0007] The current collectors are staggered between the plurality of battery modules, and each current collector is electrically connected to every two battery modules to form a module structure with two free ends; wherein the two current collectors electrically connected to each battery module are different; one free end is electrically connected to the first battery interface, and the other free end is electrically connected to the second battery interface;

[0008] The sealing ring is arranged at the edge of the opening, and the closing piece is buckled at a position of the sealing ring away from the edge of the opening.

[0009] Optionally, the middle portion of the box body extends to one side to form a protrusion, the accommodating chamber where the protrusion is located is a main accommodating chamber, the accommodating chamber close to the first side surface is a first accommodating chamber, and the accommodating chamber close to the second side surface is a second accommodating chamber, and the main accommodating chamber, the first accommodating chamber and the second accommodating chamber are connected to each other;

[0010] The liquid cooling assembly includes a first liquid cooling plate, a second liquid cooling plate, a third liquid cooling plate and a plurality of connecting pipelines; the first liquid cooling plate, the second liquid cooling plate and the third liquid cooling plate are hollow structures, and the first liquid cooling plate, the second liquid cooling plate and the third liquid cooling plate are connected through the connecting pipelines;

[0011] The first liquid cooling plate is arranged in the first accommodating chamber, the second liquid cooling plate is arranged in the main accommodating chamber, and the third liquid cooling plate is arranged in the second accommodating chamber. The first liquid cooling plate, the second liquid cooling plate and the third liquid cooling plate are all fixedly connected to the bottom side; the first liquid cooling plate is connected to the regulating liquid interaction part.

[0012] Optionally, the plurality of battery modules include a plurality of first battery modules, a plurality of second battery modules and a plurality of third battery modules;

[0013] Each of the first battery modules is disposed in the first accommodating cavity, and each of the first battery modules is fixedly attached to a position of the first liquid cooling plate away from the bottom side;

[0014] Each of the second battery modules is disposed in the main accommodating cavity, and each of the second battery modules is fixedly attached to a position of the second liquid cooling plate away from the bottom side;

[0015] Each of the third battery modules is disposed in the second accommodating cavity, and each of the third battery modules is fixedly attached to a position of the third liquid cooling plate away from the bottom side.

[0016] Optionally, the connecting pipeline connected between the first liquid cooling plate and the second liquid cooling plate is provided with an opening and closing device, and the connecting pipeline connected between the second liquid cooling plate and the third liquid cooling plate is provided with an opening and closing device.

[0017] Optionally, the first liquid cooling plate is provided with a first liquid inlet and a first liquid outlet; the regulating liquid interaction portion includes a liquid inlet portion and a liquid outlet portion;

[0018] The first liquid inlet is connected to the liquid inlet portion through a first connecting pipeline, and the first liquid outlet is connected to the second liquid cooling plate through a second connecting pipeline;

[0019] The second connecting pipeline is provided with an opening and closing device.

[0020] Optionally, the second liquid cooling plate is provided with a second liquid inlet and a second liquid outlet;

[0021] The second liquid inlet is connected to the first liquid outlet through the second connecting pipeline, and the second liquid outlet is connected to the third liquid cooling plate through the third connecting pipeline;

[0022] The third connecting pipeline is provided with an opening and closing device.

[0023] Optionally, the third liquid cooling plate is provided with a third liquid inlet and a third liquid outlet;

[0024] The third liquid inlet is communicated with the second liquid outlet through the third connecting pipeline, and the third liquid outlet is communicated with the liquid outlet portion through a fourth connecting pipeline.

[0025] Optionally, the new energy commercial vehicle battery pack further includes a battery management device, a power cut-off device and an explosion-proof valve;

[0026] The battery management device is disposed in the first accommodating cavity, and the battery management device is fixedly connected to the positions of the two first battery modules away from the liquid cooling plate; the battery management device is electrically connected to each of the first battery modules, each of the second battery modules, and each of the third battery modules;

[0027] The power cut-off device is disposed in the second accommodating cavity, and the power cut-off device is fixedly connected to the inner wall of the second side surface; the power cut-off device is electrically connected between the other free end and the second battery interface;

[0028] The explosion-proof valve is embedded in the third side surface of the box body, and the explosion-proof valve is communicated with the inside and outside of the box body.

[0029] Optionally, a communication interface is embedded in the first side surface;

[0030] The communication interface is communicatively connected to the battery management device.

[0031] An embodiment of the present invention further provides an electric vehicle, comprising the above-mentioned new energy commercial vehicle battery pack; wherein the new energy commercial vehicle battery pack is fixed in the electric vehicle.

[0032] The new energy commercial vehicle battery pack and electric vehicle provided by the embodiments of the present invention, each of the liquid cooling plates can cool the battery attached thereto, thereby achieving local targeted thermal management of the entire new energy commercial vehicle battery pack and improving the thermal management effect.

[0033] Furthermore, the first liquid cooling plate, the second liquid cooling plate, the third liquid cooling plate, multiple connecting pipes, the opening and closing devices and the mutual cooperation of the opening and closing devices can perform directional thermal management of battery modules in different areas, avoid heat loss of the regulating liquid during the flow process, and further improve the thermal management efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic diagram of the structure of a new energy commercial vehicle battery pack provided by an embodiment of the present invention.

[0036] Figure 2 The present invention is a schematic structural diagram of a box provided by an embodiment of the present invention.

[0037] Figure 3 A schematic structural diagram of a liquid cooling assembly provided in an embodiment of the present invention.

[0038] Figure 4 A schematic structural diagram of the connection between a battery module and a busbar provided in an embodiment of the present invention.

[0039] Figure 5 A first-person perspective diagram of a new energy commercial vehicle battery pack provided by an embodiment of the present invention.

[0040] Icon: 100-new energy commercial vehicle battery pack; 1-box; 11-first side; 111-first battery interface; 112-adjusting liquid interface; 113-communication interface; 1121-liquid inlet; 1122-liquid outlet; 12-second side; 121-second battery interface; 13-opening; 14-bottom; 151-first accommodating chamber; 152-main accommodating chamber; 153-second accommodating chamber; 16-fixing part; 2-liquid cooling assembly; 21-first liquid cooling plate; 211-first liquid inlet; 212-first liquid outlet; 22-second liquid cooling plate ;221-second liquid inlet;222-second liquid outlet;23-third liquid cooling plate;231-third liquid inlet;232-third liquid outlet;241-first connecting pipeline;242-second connecting pipeline;243-third connecting pipeline;244-fourth connecting pipeline;245-opening and closing device;3-sealing ring;4-closing piece;5-battery module;51-first battery module;52-second battery module;53-third battery module;54-merging piece;6-fixing piece;71-battery management device;72-power cut-off device;73-explosion-proof valve. DETAILED DESCRIPTION

[0041] As an important component of new energy electric vehicles, the performance of the battery pack directly determines whether the new energy electric vehicle can operate normally and safely. During the operation of the battery pack, the battery will generate heat. If the temperature is too high, it may affect the normal operation of the battery module or even damage the battery module. Most of the existing technologies for thermal management of batteries are not effective.

[0042] The inventors have found through experiments and analysis that the main reason why the existing battery thermal management technology is not effective is the uneven heating of the battery. For example, the temperature rise of a local battery in a battery module is too high, and this part of the battery needs to be cooled down. However, most of the existing liquid cooling devices are integrated: local cooling cannot be achieved, which will cause a problem. If the battery at the rear end of the liquid cooling device needs to be cooled, the regulating liquid will cool the battery at the front end when passing through the front end of the liquid cooling device. However, blindly cooling the battery in normal use may cause additional accidents. In short, it is difficult for the existing liquid cooling device to achieve local thermal management of the battery module, which leads to poor thermal management effect.

[0043] The defects existing in the solutions in the above-mentioned prior art are the results obtained by the inventor after practice and careful research. Therefore, the discovery process of the above-mentioned problems and the solutions proposed in the embodiments of the present invention for the above-mentioned problems below should all be the contributions made by the inventor to the present invention during the process of the present invention.

[0044] Based on the above research, an embodiment of the present invention provides a new energy commercial vehicle battery pack and an electric vehicle, which realizes thermal management of battery modules in different areas through a liquid cooling assembly with multiple liquid cooling plates, thereby improving thermal management efficiency.

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0048] In the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] Figure 1 A schematic structural diagram of a new energy commercial vehicle battery pack 100 provided in an embodiment of the present invention is shown. The commercial vehicle battery pack system 100 includes a box body 1, a liquid cooling assembly, a sealing ring 3, a closure 4, multiple busbars, multiple battery modules and multiple fixings.

[0050] The liquid cooling assembly is arranged inside the box 1 and located at the bottom of the box 1. Each busbar and each battery module are arranged inside the box 1. Each battery module fits the liquid cooling assembly. Each fixing member 6 is arranged on the peripheral side of the box 1. Each fixing member 6 is used to fix the new energy commercial vehicle battery pack in the electric vehicle.

[0051] The new energy commercial vehicle battery pack 100 can perform local targeted heat dissipation on the battery module through the built-in liquid cooling component to improve the thermal management effect. It can be understood that the liquid cooling component includes multiple liquid cooling plates and multiple connecting pipes, and the structure and connection method of the liquid cooling component are also compatible with the shape and size of the box. In order to explain the structure and connection method of the liquid cooling component in detail, the structure of the box is further explained below.

[0052] See also Figure 2 , which is a schematic structural diagram of a box provided in an embodiment of the present invention. As can be seen from the figure, the first side 11 of the box is provided with a first battery interface 111, a regulating liquid interaction part 112 and a communication interface 113, and the second side 12 of the box is provided with a second battery interface 121.

[0053] The first battery interface 111 and the second battery interface 121 are electrically connected to the two free ends of the module structure composed of the busbar and the battery module. The regulating liquid interaction part 112 is connected to the liquid cooling component, and the regulating liquid can be injected into the liquid cooling component from the regulating liquid interaction part 112 to achieve thermal management of the battery module by the liquid cooling component.

[0054] Please continue reading Figure 2, the box body is provided with an opening 13, the sealing member is buckled on the edge of the opening 13, and the closure member is buckled on the position of the sealing ring away from the edge of the opening to achieve sealing of the box body. Further, the middle part of the box body extends to one side to form a protrusion, and the accommodating chamber where the protrusion is located is the main accommodating chamber 152, the accommodating chamber close to the first side is the first accommodating chamber 151, and the accommodating chamber close to the second side is the second accommodating chamber 153, wherein the first accommodating chamber 151, the main accommodating chamber 152 and the second accommodating chamber 153 are interconnected to form a "convex" shaped structure, which is used to place the liquid cooling component and the battery module. Further, the bottom side 14 of the box body is provided with a fixed sheet metal (not shown in the figure) for fixing the liquid cooling component. The fixed sheet metal is arranged on the bottom side 14, which can increase the structural strength of the bottom of the box body and share the vibration generated by the electric vehicle during operation.

[0055] Please continue reading Figure 2 A plurality of fixing parts 16 are also provided on the peripheral side of the box body. Figure 1 One end of each fixing member 6 in the embodiment is detachably connected to Figure 2 Each fixing portion 16 in Figure 1 One end of each fixing member 6 away from each fixing part is fixedly connected to the relevant components of the electric vehicle. Such arrangement facilitates the installation and removal of the battery pack of the entire new energy commercial vehicle.

[0056] Figure 3 The schematic diagram of the structure of a liquid cooling assembly provided by an embodiment of the present invention is shown. As can be seen from the figure, the liquid cooling assembly 2 includes a first liquid cooling plate 21, a second liquid cooling plate 22, a third liquid cooling plate 23 and a plurality of connecting pipes. In this embodiment, in order to match the structure of the box, the number of the first liquid cooling plate 21 is one, the number of the second liquid cooling plate 22 is two, and the number of the third liquid cooling plate 23 is one. For further information, please refer to Figure 2 and Figure 3 The first liquid cooling plate 21 is fixed on the fixed sheet metal of the first accommodating cavity 151, the two second liquid cooling plates 22 are fixed on the fixed sheet metal of the main accommodating cavity 152, and the third liquid cooling plate 23 is fixed on the fixed sheet metal of the second accommodating cavity 153. It can be understood that each liquid cooling plate can perform thermal management on the battery module arranged on its surface.

[0057] It should be understood that the number of the first liquid cooling plate 21 , the second liquid cooling plate 22 and the third liquid cooling plate 23 can be adjusted according to the actual scale of the battery pack, and is not limited to the number given in this embodiment.

[0058] Furthermore, in order to perform local targeted thermal management on the battery module, it is also necessary to design the connection relationship of the connecting pipes. Figure 3The connecting pipeline includes a first connecting pipeline 241, a second connecting pipeline 242, a third connecting pipeline 243 and a fourth connecting pipeline 244, wherein these connecting pipelines are connected with each liquid cooling plate to realize the directional flow of the regulating liquid in the connecting pipeline and each liquid cooling plate. It can be understood that the first liquid cooling plate 21, the second liquid cooling plate 22 and the third liquid cooling plate 23 are all hollow structures, and the regulating liquid can flow in the hollow structure.

[0059] The following will further explain the connection methods between each connecting pipe and each liquid cooling plate. Please continue to refer to Figure 3 The first liquid cooling plate 21 is provided with a first liquid inlet 211 and a first liquid outlet 212 , the second liquid cooling plate 22 is provided with a second liquid inlet 221 and a second liquid outlet 222 , and the third liquid cooling plate 23 is provided with a third liquid inlet 231 and a third liquid outlet 232 . Among them, the first liquid inlet 211 is connected to the liquid inlet part 1121 of the regulating liquid interaction part, the first liquid inlet 212 is connected to the second connecting pipeline 242, the second connecting pipeline 242 is respectively connected to the two second liquid inlets 221, and further, one of the second liquid outlets 222 is connected to the third connecting pipeline 243, the third connecting pipeline 243 is connected to the third liquid inlet 231, the third liquid outlet 232 is connected to the fourth connecting pipeline 244, and the fourth connecting pipeline 244 is respectively connected to the first connecting pipeline 241 and another second liquid outlet 222, thus forming a pipeline structure interconnected with each other, wherein, for the connection structure of the liquid cooling component, the first connecting pipeline 241, the second connecting pipeline 242, the third connecting pipeline 243 and the fourth connecting pipeline 244 are all provided with an opening and closing device 245, and the opening and closing device 245 is used to guide the regulating liquid injected into the first connecting pipeline 241.

[0060] The following will explain with specific examples Figure 3 How to achieve local thermal management in the liquid cooling component 2.

[0061] When it is necessary to perform thermal management on all battery modules arranged on the three liquid cooling plates, the regulating liquid enters the first connecting pipeline 241 through the liquid inlet 1121. At this time, the opening and closing device 245 arranged on the first connecting pipeline 241 cuts off the passage between the first connecting pipeline 241 and the fourth connecting pipeline 244. The flow direction of the regulating liquid is: the first liquid inlet 211, the first liquid cooling plate 21, the first liquid outlet 212, the second connecting pipeline 242, the second liquid inlet of the second liquid cooling plate 22 on the right, the second liquid cooling plate 22 on the right, the second liquid outlet of the second liquid cooling plate 22 on the right, the third connecting pipeline 243, the third liquid inlet 231, the third liquid cooling plate 23, the third liquid outlet 232, the fourth connecting pipeline 244, the second liquid inlet of the second liquid cooling plate 22 on the left, the second liquid outlet of the second liquid cooling plate 22 on the left, the fourth connecting pipeline 244, and finally flows out from the liquid outlet 1122.

[0062] The above-mentioned regulating liquid flow direction is the flow direction for heat dissipation of all battery modules. For example, if only the battery module arranged on the first liquid cooling plate 21 needs to be thermally managed, the opening and closing device 245 located on the first connecting pipeline 241 and the second connecting pipeline 242 can be operated to cut off the relevant passages. At this time, the regulating liquid only circulates through the first liquid cooling plate, which can achieve local targeted thermal management.

[0063] It can be understood that, in view of the thermal management coordination of each liquid cooling plate, relevant settings can be made for each opening and closing device 245, which will not be further explained here.

[0064] Optionally, see Figure 3 A side of each liquid cooling plate away from the bottom side of the box body is provided with placement holes for fixing the battery modules, and the battery modules can be arranged in these placement holes.

[0065] This embodiment also optimizes the connection method for multiple battery modules. Figure 4 , is a schematic diagram of a structure of a battery module and a busbar connected in an embodiment of the present invention. As can be seen from the figure, the battery module 5 includes a plurality of first battery modules 51, a plurality of second battery modules 52 and a plurality of third battery modules 53. In this embodiment, the number of the first battery modules 51, the second battery modules 52 and the third battery modules 53 are four, six and one respectively.

[0066] Please refer to Figure 3 and Figure 4 Each first battery module 51 is disposed in the first accommodating cavity, and each first battery module 51 is fixedly attached to the first liquid cooling plate 21. Each second battery module 52 is disposed in the main accommodating cavity, and each second battery module 52 is fixedly attached to the second liquid cooling plate 22. The third battery module 53 is disposed in the second accommodating cavity, and the third battery module 53 is fixedly attached to the third liquid cooling plate 23.

[0067] Furthermore, each busbar 54 is staggered between the multiple battery modules 5, and each busbar 54 is electrically connected to every two battery modules 5 to form a module structure with two free ends. Among them, the two busbars 54 electrically connected to each battery module 5 are different, one free end is electrically connected to the first battery interface, and the other free end is electrically connected to the second battery interface. The staggered arrangement of the busbars 54 can increase the structural strength of the multiple battery modules 5, and there is no need to add an additional structure to fix the battery modules, thereby reducing the manufacturing cost.

[0068] For further information, see Figure 5, which is a first-perspective schematic diagram of a new energy commercial vehicle battery pack provided by an embodiment of the present invention. As can be seen from the figure, the new energy commercial vehicle battery pack also includes a battery management device 71, a power cut-off device 72 and an explosion-proof valve 73.

[0069] Among them, the battery management device 71 is arranged in the first accommodating cavity, and the battery management device 71 is fixedly connected to the position of the two first battery modules away from the liquid cooling plate. The battery management device 71 is electrically connected to each first battery module, each second battery module and each third battery module. Furthermore, the battery management device 71 is communicatively connected to the communication interface. The function of the battery management device 71 is mainly to detect the battery parameters such as voltage, current and temperature in real time and control them to always be within the allowable working parameter range, and at the same time continuously measure the insulation resistance of the battery system. The battery management device 71 communicates in real time with the vehicle controller, charger, etc. through the CAN bus to warn of SOC (state of charge) and faults.

[0070] Furthermore, the power cut-off device 72 is arranged in the secondary accommodation cavity, the power cut-off device 72 is fixedly connected to the inner wall of the second side, and the power cut-off device 72 is electrically connected between the other free end and the second battery interface. The function of the power cut-off device 72 is mainly to cut off and close the main circuit and the pre-charging circuit to switch and control the main circuit and the pre-charging circuit; collect the instantaneous current during the charging and discharging process to determine the charging and discharging state; the battery pack is connected to the high-voltage interface through the output end of the power cut-off device to charge and discharge the battery pack. It can be understood that the first battery interface and the second battery interface are high-voltage interfaces.

[0071] The explosion-proof valve 73 is embedded in the third side of the box body, and is connected to the inside and outside of the box body. The explosion-proof valve 73 can release the excessive air pressure in the battery pack in time and prevent the explosion caused by the rapid increase of pressure in the battery pack during thermal instability.

[0072] On this basis, an embodiment of the present invention further provides an electric vehicle, including the above-mentioned new energy commercial vehicle battery pack. Among them, two new energy commercial vehicle battery packs can be used in combination and arranged in one electric vehicle, and the high-voltage interfaces of the two new energy commercial vehicle battery packs are electrically connected and connected to the corresponding interfaces of the electric vehicle to realize power supply to the electric vehicle. During the power supply process, the liquid cooling component can perform local targeted thermal management on the batteries in the battery pack, thereby improving the reliability of the battery pack and ensuring the driving safety of the electric vehicle.

[0073] In summary, the new energy commercial vehicle battery pack and electric vehicle provided in the embodiments of the present invention have a liquid cooling assembly with multiple liquid cooling plates and connecting pipes, which can perform local targeted thermal management of the battery, improve the thermal management efficiency, and thus ensure the reliability of the battery pack.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A new energy commercial vehicle battery pack, It is characterized in that include: A box, a liquid cooling assembly having a plurality of liquid cooling plates, a sealing ring, a closure, a plurality of busbars and a plurality of battery modules; The first side of the box body is provided with a regulating liquid interaction part and a first battery interface, the second side of the box body is provided with a second battery interface, and the first side and the second side face each other; the box body includes a receiving cavity with an opening; The liquid cooling component is arranged in the accommodating cavity and fixed to the bottom side of the box body, the liquid cooling component is a hollow structure, and the liquid cooling component is connected to the regulating liquid interaction part; each battery module is accommodated in the accommodating cavity and fixedly attached to a position of each liquid cooling plate away from the bottom side; The current collectors are staggered between the plurality of battery modules, and each current collector is electrically connected to every two battery modules to form a module structure with two free ends; wherein the two current collectors electrically connected to each battery module are different; one free end is electrically connected to the first battery interface, and the other free end is electrically connected to the second battery interface; The sealing ring is arranged at the edge of the opening, and the closing member is buckled at a position of the sealing ring away from the edge of the opening; The middle part of the box body extends to one side to form a protrusion, the accommodating chamber where the protrusion is located is a main accommodating chamber, the accommodating chamber close to the first side is a first accommodating chamber, and the accommodating chamber close to the second side is a second accommodating chamber, and the main accommodating chamber, the first accommodating chamber and the second accommodating chamber are connected to each other; The liquid cooling assembly includes a first liquid cooling plate, a second liquid cooling plate, a third liquid cooling plate and a plurality of connecting pipelines; the first liquid cooling plate, the second liquid cooling plate and the third liquid cooling plate are hollow structures, and the first liquid cooling plate, the second liquid cooling plate and the third liquid cooling plate are connected through the connecting pipelines; The first liquid cooling plate is arranged in the first accommodating chamber, the second liquid cooling plate is arranged in the main accommodating chamber, and the third liquid cooling plate is arranged in the second accommodating chamber. The first liquid cooling plate, the second liquid cooling plate and the third liquid cooling plate are all fixedly connected to the bottom side; the first liquid cooling plate is in communication with the regulating liquid interaction part; The plurality of battery modules include a plurality of first battery modules, a plurality of second battery modules and a plurality of third battery modules; Each of the first battery modules is disposed in the first accommodating cavity, and each of the first battery modules is fixedly attached to a position of the first liquid cooling plate away from the bottom side; Each of the second battery modules is disposed in the main accommodating cavity, and each of the second battery modules is fixedly attached to a position of the second liquid cooling plate away from the bottom side; Each of the third battery modules is disposed in the second accommodating cavity, and each of the third battery modules is fixedly attached to a position of the third liquid cooling plate away from the bottom side; The new energy commercial vehicle battery pack also includes a battery management device, a power cut-off device and an explosion-proof valve; The battery management device is disposed in the first accommodating cavity, and the battery management device is fixedly connected to the positions of the two first battery modules away from the liquid cooling plate; the battery management device is electrically connected to each of the first battery modules, each of the second battery modules, and each of the third battery modules; The power cut-off device is disposed in the second accommodating cavity, and the power cut-off device is fixedly connected to the inner wall of the second side surface; the power cut-off device is electrically connected between the other free end and the second battery interface; The explosion-proof valve is embedded in the third side surface of the box body, and the explosion-proof valve is communicated with the inside and outside of the box body.

2. The new energy commercial vehicle battery pack according to claim 1, It is characterized in that The connecting pipeline connected between the first liquid cooling plate and the second liquid cooling plate is provided with an opening and closing device, and the connecting pipeline connected between the second liquid cooling plate and the third liquid cooling plate is provided with an opening and closing device.

3. The new energy commercial vehicle battery pack according to claim 1, It is characterized in that The first liquid cooling plate is provided with a first liquid inlet and a first liquid outlet; the regulating liquid interaction portion includes a liquid inlet portion and a liquid outlet portion; The first liquid inlet is connected to the liquid inlet portion through a first connecting pipeline, and the first liquid outlet is connected to the second liquid cooling plate through a second connecting pipeline; The second connecting pipeline is provided with an opening and closing device.

4. The new energy commercial vehicle battery pack according to claim 3, It is characterized in that The second liquid cooling plate is provided with a second liquid inlet and a second liquid outlet; The second liquid inlet is connected to the first liquid outlet through the second connecting pipeline, and the second liquid outlet is connected to the third liquid cooling plate through the third connecting pipeline; The third connecting pipeline is provided with an opening and closing device.

5. The new energy commercial vehicle battery pack according to claim 4, It is characterized in that The third liquid cooling plate is provided with a third liquid inlet and a third liquid outlet; The third liquid inlet is communicated with the second liquid outlet through the third connecting pipeline, and the third liquid outlet is communicated with the liquid outlet portion through a fourth connecting pipeline.

6. The new energy commercial vehicle battery pack according to claim 2, It is characterized in that The first side surface is embedded with a communication interface; The communication interface is communicatively connected to the battery management device.

7. An electric vehicle, It is characterized in that A new energy commercial vehicle battery pack comprising any one of claims 1 to 6 above; The new energy commercial vehicle battery pack is fixed in the electric vehicle.

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