Connecting device, battery rack and electric vehicle

Abstract

The invention discloses a connecting device, a battery rack and an electric vehicle, and the connecting device comprises a liquid cooling connecting assembly which is used for being inserted into a liquid cooling pipeline of a battery pack so as to convey cooling liquid; and the in-place detector is used for detecting whether the liquid cooling connecting assembly and the liquid cooling pipeline are inserted in place or not. By means of the in-place detector, the plugging condition of the liquid cooling connecting assembly and the liquid cooling pipeline can be detected, the system can start conveying of cooling liquid only when the liquid cooling connecting assembly is completely in place by means of immediate feedback of the in-place detector, and the liquid leakage risk caused by the fact that plugging is not in place is effectively prevented.

Description

Technical Field

[0001] The present invention relates to the field of battery swapping, and particularly to a connecting device, a battery rack, and an electric vehicle. Background Art

[0002] In recent years, with the improvement of environmental protection awareness and the increasingly significant negative impact of automobile exhaust emissions on the environment, new energy vehicles have become a popular choice for people to solve environmental problems. Electric vehicles, as a zero-emission means of transportation, have broad market prospects. Currently, the charging methods of electric vehicles mainly include direct charging and quick battery swapping. Although the direct charging method is widely popular, due to its long charging time and uneven distribution of charging piles, the new energy vehicle field has gradually adopted the mode of quickly replacing batteries to improve the efficiency and convenience of energy replenishment.

[0003] In the mode of quick battery swapping, when an electric vehicle replaces its battery, the battery swapping device will remove the discharged battery and transfer it to the battery transfer device, and then install it back into the electric vehicle after charging. However, the heat generated during the process of the battery transmitting electric energy may cause the battery temperature to rise, thus posing a safety hazard. To solve this problem, the prior art uses coolant for heat dissipation. However, there are problems with the existing battery pack connection solutions, that is, coolant leakage is likely to occur during the connection process, which not only affects the heat dissipation effect of the battery but also may cause safety hazards. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defect that the coolant of the battery pack in the prior art is prone to leakage, and to provide a connecting device, a battery rack, and an electric vehicle.

[0005] The present invention solves the above technical problem by the following technical solutions:

[0006] A connecting device, comprising:

[0007] A liquid cooling connection assembly for plugging into the liquid cooling pipeline of the battery pack to convey coolant;

[0008] A position detector for detecting whether the liquid cooling connection assembly is plugged into the liquid cooling pipeline in place.

[0009] In this solution, through the position detector, the plugging situation of the liquid cooling connection assembly and the liquid cooling pipeline can be detected. Utilizing the immediate feedback of the position detector, the system can start the conveyance of coolant only when the liquid cooling connection assembly is in place, effectively preventing the risk of liquid leakage caused by improper plugging.

[0010] Preferably, there are two liquid-cooling connection assemblies, which are arranged at intervals along the width direction of the battery pack. The two liquid-cooling connection assemblies are connected to each other and connected with the corresponding liquid cooling pipelines to form a liquid cooling circulation path; there are two in-place detectors, which are respectively arranged on one side of the liquid-cooling connection assembly.

[0011] In this solution, by setting the number and position distribution of liquid-cooling connection components, a more uniform cooling effect can be provided to the battery pack. The two liquid-cooling connection components are connected to form a liquid-cooling circulation path, ensuring that the coolant circulates in the battery pack, thereby maximizing the cooling efficiency. Each liquid-cooling connection component is provided with an in-place detector to ensure that each liquid-cooling connection component can be detected in a timely and accurate manner. Only after confirming that all liquid-cooling connection components are inserted in place, the system starts the delivery of coolant, effectively preventing the risk of leakage caused by failure to plug in in place.

[0012] Preferably, the connecting device further comprises a fixed plate and a floating plate which is arranged on the fixed plate and is movable relative to the fixed plate along the height direction of the battery pack, and the liquid cooling connecting assembly and the in-place detector are both arranged on the floating plate.

[0013] In the present solution, the structure is arranged such that the floating ability of the floating plate in the height direction of the battery pack compensates for the position error of the liquid-cooling connection assembly and the liquid-cooling pipe joint, realizes compensation for the position error, and provides more fault-tolerant space; during the plug-in process, the floating plate can provide flexible posture adjustment to ensure the precise alignment of the liquid-cooling connection assembly when inserted into the battery pack, thereby improving the plug-in success rate of the liquid-cooling connection assembly and the insertion detector.

[0014] Preferably, the in-place detector includes a detection portion and a telescopic portion, wherein the telescopic portion can abut against the battery pack and can move in a direction opposite to the connection direction during the connection between the liquid-cooling connection assembly and the liquid-cooling pipeline, so that the sensing element on the telescopic portion moves therewith until it is sensed by the detection portion to confirm that the liquid-cooling connection assembly and the liquid-cooling pipeline are in place.

[0015] In this solution, the telescopic part abuts against the battery pack during the plugging process and moves in a direction opposite to the plugging direction. The sensing part on the telescopic part moves along with it until it is sensed by the detection part, thereby realizing the detection of the plug-in status of the liquid-cooling connection assembly and the liquid-cooling pipeline. Only when the sensing part is sensed by the detection part, the system will confirm that the liquid-cooling connection assembly and the liquid-cooling pipeline are plugged in place. Through the feedback from the detection part, the positioning status can be detected in time. The positioning detector adopts a contact design to make the detection result more reliable.

[0016] Preferably, the liquid cooling connection assembly is arranged on a side of the floating plate facing the battery pack, the detection part is arranged on a side of the floating plate facing away from the battery pack, the telescopic part is located above the floating plate and penetrates the fixed plate, and the end of the telescopic part and the liquid cooling connection assembly located on the same side can be abutted against the battery pack during the plug-in process to drive the telescopic part to move, and the sensing part is provided on the end of the telescopic part and the detection part located on the same side.

[0017] In the present solution, the liquid cooling connection assembly is arranged on the side of the floating plate facing the battery pack, and the detection part is arranged on the other side, and the telescopic part is passed through the fixed plate, one end of which is used to abut against the battery pack, and the other end is provided with a sensing element, so that the detection part and the sensing element are arranged on the side of the floating plate away from the battery pack. This structural arrangement reduces the space requirement on the side of the floating plate that is connected to the battery pack, simplifies the component configuration on this side, and effectively reduces the interference that may occur during the connection with the battery pack.

[0018] Preferably, the in-place detector also includes a connecting portion connected to the floating plate and a fixed portion arranged on the connecting portion, the fixed portion includes a horizontal plate and two vertical plates arranged on the horizontal plate, the detection portion is installed on the horizontal plate, the two vertical plates are arranged opposite to each other, the telescopic portion is passed through the two vertical plates and the sensing element is located between the two vertical plates.

[0019] In this solution, the combination of the connecting part, the horizontal plate and the vertical plate makes the overall structure of the in-place detector more compact. The two vertical plates are spaced and arranged relatively to each other in the connection direction between the liquid-cooling connecting assembly and the liquid-cooling pipeline, providing an installation basis for the telescopic part passed through the vertical plates and limiting the moving direction of the telescopic part. The sensing part is located between the two vertical plates and cooperates with the detection part on the horizontal plate. When the telescopic part moves, it ensures that the detection part can accurately sense the sensing part, so as to accurately detect the connection status of the liquid-cooling connecting assembly and the liquid-cooling pipeline, with high reliability.

[0020] Preferably, a mounting hole is provided on the fixing plate, the mounting hole is in a long waist shape and the waist direction is along the height direction of the battery pack, and the outer diameter of the abutting end of the telescopic part abutting against the battery pack is larger than the hole diameter of the mounting hole.

[0021] In the present solution, by designing the mounting hole into a long waist shape with the waist shape direction consistent with the height direction of the battery pack, it is ensured that the telescopic part can move flexibly in the mounting hole when the floating plate floats, thereby achieving compensation for position errors and providing more fault tolerance space. By setting the outer diameter of the abutting end to be larger than the aperture of the mounting hole, the fixed plate can limit the telescopic part, thereby preventing the telescopic part from detaching from the fixed plate due to excessive movement.

[0022] Preferably, the abutting end is spherical, and the spherical surface faces the battery pack;

[0023] And / or, the abutting end is detachable relative to the body of the telescopic part.

[0024] In this solution, the spherical shape of the abutting end makes the contact surface more uniform, without sharp corners, reducing the impact and friction on the battery pack during abutting; by designing the abutting end to be detachable, when the abutting end is damaged, only the abutting end itself needs to be replaced, rather than replacing the entire telescopic part, thereby reducing the replacement cost.

[0025] Preferably, the liquid cooling connection assembly includes a movable plate, liquid cooling interfaces arranged on the movable plate, and two positioning columns. The end corners of the movable plate are floatingly connected to the floating plate. The liquid cooling interfaces are used for plugging and unplugging with the liquid cooling pipelines, and the positioning columns are respectively located on both sides of the liquid cooling interfaces.

[0026] In this solution, through the floating design of the floating plate relative to the fixed plate and the movable plate relative to the floating plate, the liquid cooling interfaces are given a two-fold floating amount, so as to better compensate for the possible position errors during the plugging and unplugging process, enabling the liquid cooling interfaces to adjust their positions more flexibly, providing a greater tolerance space and adaptability for connection, and thus better adapting to the actual plugging and unplugging situation. At the same time, the positioning columns are arranged on both sides of the liquid cooling interfaces, further improving the docking accuracy of the liquid cooling interfaces during the plugging and unplugging process.

[0027] Preferably, the connecting device further includes an electrical connection assembly, which is used for docking with the electrical connection head of the battery pack to transmit electric energy. The electrical connection assembly is arranged between the two liquid cooling connection assemblies and is floatingly connected to the fixed plate. The electrical connection assembly is floating in the width direction and / or height direction of the battery pack.

[0028] In this solution, since liquid cooling connection assemblies are provided on both sides of the electrical connection assembly, the coolant can more effectively cool the electrical connection assembly. At the same time, the floating connection design of the electrical connection assembly compensates for the possible position errors during the plugging and unplugging process, enabling the electrical connection assembly to adjust its position more flexibly during the plugging and unplugging process and improving the connection success rate.

[0029] The present invention also discloses a battery rack, which includes the above-mentioned connecting device.

[0030] The present invention also discloses an electric vehicle, which includes the above-mentioned connecting device.

[0031] The positive and progressive effects of the present invention are as follows: Through the in-place detector, the connection situation between the liquid-cooled connection component and the liquid-cooled pipeline can be detected. By using the instant feedback of the in-place detector, the system can start the delivery of the coolant only when the liquid-cooled connection component is in place completely, effectively preventing the leakage risk caused by the incomplete connection. Description of the Drawings

[0032] Figure 1 It is a schematic structural diagram of the battery rack according to Embodiment 1 of the present invention.

[0033] Figure 2 It is a schematic structural diagram (1) of one side of the connection device according to Embodiment 1 of the present invention facing the battery pack.

[0034] Figure 3 It is a schematic structural diagram (2) of one side of the connection device according to Embodiment 1 of the present invention facing the battery pack.

[0035] Figure 4 It is a partial schematic structural diagram of one side of the connection device according to Embodiment 1 of the present invention facing the battery pack.

[0036] Figure 5 It is a schematic internal structural diagram of the liquid-cooled connection component according to Embodiment 1 of the present invention.

[0037] Figure 6 It is a schematic structural diagram (1) of the side of the connection device according to Embodiment 1 of the present invention opposite to the battery pack.

[0038] Figure 7 It is a schematic structural diagram (2) of the side of the connection device according to Embodiment 1 of the present invention opposite to the battery pack.

[0039] Figure 8 It is a partial schematic structural diagram of the side of the connection device according to Embodiment 1 of the present invention opposite to the battery pack.

[0040] Figure 9 It is a schematic structural diagram of the in-place detector (the sensing member is not sensed by the detecting portion) and the movable plate according to Embodiment 1 of the present invention.

[0041] Figure 10 It is a schematic structural diagram of the in-place detector (the sensing member is sensed by the detecting portion) and the movable plate according to Embodiment 1 of the present invention.

[0042] Figure 11 It is a schematic structural diagram of the battery pack according to Embodiment 1 of the present invention.

[0043] Description of the Reference Numerals

[0044] Connection device 1

[0045] Liquid-cooled connection component 11

[0046] Movable plate 111

[0047] Liquid cooling interface 112

[0048] Positioning post 113

[0049] In-place detector 12

[0050] Detection part 121

[0051] Telescopic part 122

[0052] Induction part 1221

[0053] Abutting end 1222

[0054] Fixing part 123

[0055] Horizontal plate 1231

[0056] Vertical plate 1232

[0057] Connection part 124

[0058] Fixing plate 13

[0059] Mounting hole 131

[0060] Floating plate 14

[0061] Electric connection assembly 15

[0062] Battery pack 2

[0063] Electric connection head 21

[0064] Liquid cooling pipeline 22

[0065] Width direction A of the battery pack

[0066] Height direction B of the battery pack

[0067] Insertion direction C Specific embodiments

[0068] The present invention will be further described below by way of embodiments, but the present invention is not limited to the scope of the described embodiments.

[0069] Embodiment 1

[0070] As Figure 1 shown, this embodiment discloses a battery rack, in which a plurality of battery compartments are provided on the battery rack, and a connection device 1 is provided in the battery compartment.

[0071] Specifically, as Figures 2 - 11As shown in the figure, the connection device 1 includes: a liquid-cooling connection component 11 for plugging into the liquid-cooling pipeline 22 of the battery pack 2 (not shown in the figure) to convey the coolant; a position detector 12 for detecting whether the liquid-cooling connection component 11 is plugged into the liquid-cooling pipeline 22 in place. Through the position detector 12, the plugging situation between the liquid-cooling connection component 11 and the liquid-cooling pipeline 22 can be detected. By using the immediate feedback of the position detector 12, the system can start the conveyance of the coolant only when the liquid-cooling connection component 11 is in place completely, effectively preventing the risk of liquid leakage caused by incomplete plugging.

[0072] As Figures 2 - 4 shown in the figure, there are two liquid-cooling connection components 11, which are arranged at intervals along the width direction of the battery pack 2. The two liquid-cooling connection components 11 are communicated with each other and are plugged into the respective corresponding liquid-cooling pipelines 22 to form a liquid-cooling circulation path; there are two position detectors 12, which are respectively arranged on one side of the liquid-cooling connection component 11. In this embodiment, through the setting of the quantity and position distribution of the liquid-cooling connection components 11, a more uniform cooling effect can be provided for the battery pack 2. The two liquid-cooling connection components 11 are communicated with each other to form a liquid-cooling circulation path, ensuring that the coolant circulates in the battery pack 2, maximizing the cooling efficiency. Each liquid-cooling connection component 11 is correspondingly provided with a position detector 12, which can ensure that each liquid-cooling connection component 11 can be detected in a timely and accurate manner. Only after confirming that all the liquid-cooling connection components 11 are inserted in place, the system starts the conveyance of the coolant, effectively preventing the risk of liquid leakage caused by incomplete plugging. In other alternative embodiments, more quantities of the liquid-cooling connection components 11 and the position detectors 12 can be set according to actual needs. Of course, one liquid-cooling connection component 11 and one position detector 12 can also be set.

[0073] As Figures 3 - 5 shown in the figure, the connection device 1 further includes a fixing plate 13 and a floating plate 14 arranged on the fixing plate 13 and movable relative to the fixing plate 13 along the height direction of the battery pack 2. The liquid-cooling connection component 11 and the position detector 12 are both arranged on the floating plate 14. The floating ability of the floating plate 14 in the height direction of the battery pack 2 compensates for the position error between the joints of the liquid-cooling connection component 11 and the liquid-cooling pipeline 22, realizes the compensation for the position error, and provides more tolerance space; during the plugging process, the floating plate 14 can provide flexible attitude adjustment to ensure the precise alignment when the liquid-cooling connection component 11 is inserted into the battery pack 2, thereby improving the success rate of the plugging in place of the liquid-cooling connection component 11 and the position detector 12. Of course, in other alternative embodiments, the liquid-cooling connection component 11 and the position detector 12 may not adopt the form of floating connection, that is, the liquid-cooling connection component 11 and the position detector 12 are both fixedly connected to the fixing plate 13.

[0074] As Figures 7 - 10As shown, the in-place detector 12 includes a detection portion 121 and a telescopic portion 122. The telescopic portion 122 can abut against the battery pack 2 during the plugging process of the liquid-cooling connection assembly 11 and the liquid-cooling pipeline 22 and can move in a direction opposite to the plugging direction, so that the sensing element 1221 on the telescopic portion 122 moves therewith until it is sensed by the detection portion 121 to confirm that the liquid-cooling connection assembly 11 and the liquid-cooling pipeline 22 are in place.

[0075] Specifically, Figure 9 and Figure 10 As shown, when the liquid-cooling connection assembly 11 begins to be connected with the liquid-cooling pipeline 22, the telescopic portion 122 abuts against the battery pack 2, and the sensing member 1221 moves accordingly. The detection unit 121 continuously senses the position of the sensing member 1221. When the liquid-cooling connection assembly 11 and the liquid-cooling pipeline 22 are connected in place, the position of the sensing member 1221 reaches a certain point, so that the detection unit 121 can sense and confirm that it is in place. After the detection unit 121 senses, the system confirms that the liquid-cooling connection assembly 11 and the liquid-cooling pipeline 22 are connected in place.

[0076] In this embodiment, the telescopic portion 122 abuts against the battery pack 2 during the plugging process and moves in a direction opposite to the plugging direction. The sensing element 1221 on the telescopic portion 122 moves along with it until it is sensed by the detection portion 121, thereby realizing the detection of the plugging status of the liquid-cooling connection assembly 11 and the liquid-cooling pipeline 22. Only when the sensing element 1221 is sensed by the detection portion 121, the system will confirm that the liquid-cooling connection assembly 11 and the liquid-cooling pipeline 22 are plugged in place. Through the feedback of the detection portion 121, the plugging status can be detected in time. The plugging status detector 12 adopts a contact design to make the detection result more reliable. Of course, in other alternative embodiments, the plugging status detector 12 can also use other types of sensors, such as optical sensors, which detect the optical properties of objects, such as light reflection or transmission, to achieve plugging detection; ultrasonic sensors, which can measure the distance between the object and the sensor, and can therefore be used to detect whether the liquid-cooling connection assembly 11 is plugged in place.

[0077] like Figure 4 , Figure 8 and Figure 9 As shown, the liquid-cooling connection assembly 11 is arranged on the side of the floating plate 14 facing the battery pack 2, the detection part 121 is arranged on the side of the floating plate 14 away from the battery pack 2, the telescopic part 122 is located above the floating plate 14 and penetrates the fixed plate 13, and the end of the telescopic part 122 and the liquid-cooling connection assembly 11 located on the same side can be abutted against the battery pack 2 during the plug-in process to drive the telescopic part 122 to move, and the end of the telescopic part 122 and the detection part 121 located on the same side is provided with a sensing element 1221.

[0078] In this embodiment, the liquid cooling connection component 11 is arranged on the side of the floating plate 14 facing the battery pack 2, while the detection part 121 is arranged on the other side. The telescopic part 122 is inserted through the fixed plate 13, one end of which is used to abut against the battery pack 2, and the other end is provided with an induction piece 1221. Thus, both the detection part 121 and the induction piece 1221 are arranged on the side of the floating plate 14 away from the battery pack 2. This structural arrangement reduces the space requirement on the side of the floating plate 14 for docking with the battery pack 2, simplifies the component configuration on this side, and effectively reduces the interference that may occur during the plugging process with the battery pack 2. Of course, in other alternative embodiments, the in-place detector 12 can also be arranged on the side of the floating plate 14 for docking with the battery pack 2.

[0079] As Figure 9 shown, the in-place detector 12 further includes a connection part 124 connected to the floating plate 14 and a fixing part 123 arranged on the connection part 124. The fixing part 123 includes a horizontal plate 1231 and two vertical plates 1232 arranged on the horizontal plate 1231. The detection part 121 is installed on the horizontal plate 1231. The two vertical plates 1232 are arranged oppositely. The telescopic part 122 is inserted through the two vertical plates 1232 and the induction piece 1221 is located between the two vertical plates 1232. The combination of the connection part 124, the horizontal plate 1231 and the vertical plates 1232 makes the overall structure of the in-place detector 12 more compact. The two vertical plates 1232 are spaced and arranged oppositely in the plugging direction of the liquid cooling connection component and the liquid cooling pipeline 22, providing an installation basis for the telescopic part inserted through the vertical plates and restricting the moving direction of the telescopic part. The induction piece 1221 is located between the two vertical plates 1232 and cooperates with the detection part 121 on the horizontal plate 1231. When the telescopic part 122 moves, it ensures that the detection part 121 can accurately sense the induction piece 1221 to accurately detect the plugging state of the liquid cooling connection component 11 and the liquid cooling pipeline 22, with high reliability.

[0080] As Figure 4As shown in the figure, the fixing plate 13 is provided with a mounting hole 131. The mounting hole 131 is oblong, and the oblong direction is along the height direction of the battery pack 2. The outer diameter of the abutting end 1222 where the telescopic part 122 abuts against the battery pack 2 is larger than the aperture of the mounting hole 131. By designing the mounting hole 131 to be oblong with its oblong direction consistent with the height direction of the battery pack 2, it ensures that the telescopic part 122 can move flexibly within the mounting hole 131 when the floating plate 14 floats, compensating for position errors and providing more tolerance space. By setting the outer diameter of the abutting end 1222 to be larger than the aperture of the mounting hole 131, the fixing plate 13 can limit the telescopic part 122 and prevent the telescopic part 122 from detaching from the fixing plate 13 due to excessive movement. Of course, in other alternative embodiments, the mounting hole 131 may not be provided on the fixing plate 13. For example, the telescopic part 122 can extend from above the fixing plate 13 to the side where the floating plate 14 is docked with the battery pack 2, so as to abut against the battery pack 2 during the plugging process.

[0081] Specifically, as Figure 4 and Figure 9 shown, the abutting end 1222 is spherical, and the spherical surface faces the battery pack 2; the abutting end 1222 is detachable relative to the body of the telescopic part 122. The spherical shape of the abutting end 1222 makes the contact surface more uniform without sharp corners, reducing the impact and friction on the battery pack 2 during abutment; by designing the abutting end 1222 to be detachable, when the abutting end 1222 is damaged, only the abutting end 1222 itself needs to be replaced, rather than the entire telescopic part 122, thus reducing the replacement cost. In other alternative embodiments, the abutting end 1222 can also be of other shapes. Of course, the abutting end 1222 can also be set to be non-detachable, that is, the telescopic part 122 is integrally formed.

[0082] Specifically, in order not to easily damage the battery pack 2, the hardness of the material of the abutting end 1222 should be lower than that of iron. Preferably, the material of the abutting end 1222 is brass.

[0083] As Figure 4 and Figure 5As shown in the figure, the liquid cooling connection assembly 11 includes a movable plate 111, a liquid cooling interface 112 disposed on the movable plate 111, and two positioning posts 113. The end corners of the movable plate 111 are floatingly connected to the floating plate 14. The liquid cooling interface 112 is used for plugging with the liquid cooling pipeline 22, and the positioning posts 113 are respectively located on both sides of the liquid cooling interface 112. Through the floating design of the floating plate 14 relative to the fixed plate 13 and the movable plate 111 relative to the floating plate 14, the liquid cooling interface 112 is given a two-fold floating amount, so as to better compensate for the possible position errors in the plugging process, enabling the liquid cooling interface 112 to adjust its position more flexibly, providing a greater tolerance space and adaptability for the connection, and thus better adapting to the actual plugging situation. At the same time, the positioning posts 113 are arranged on both sides of the liquid cooling interface 112, further improving the docking accuracy of the liquid cooling interface 112 during the plugging process. Of course, in other alternative embodiments, the movable plate 111 may not be provided, that is, the liquid cooling interface 112 and the positioning posts 113 are both directly provided on the floating plate 14.

[0084] As Figure 2 and 3 shown in the figure, the connection device 1 further includes an electrical connection assembly 15. The electrical connection assembly 15 is used for docking with the electrical connection head 21 of the battery pack 2 to transmit electric energy. The electrical connection assembly 15 is disposed between the two liquid cooling connection assemblies 11 and is floatingly connected to the fixed plate 13. The electrical connection assembly 15 is floating in the width direction and height direction of the battery pack 2. Since the liquid cooling connection assemblies 11 are provided on both sides of the electrical connection assembly 15, the coolant can more effectively cool the electrical connection assembly 15. At the same time, the floating connection design of the electrical connection assembly 15 compensates for the possible position errors in the plugging process, enabling the electrical connection assembly 15 to adjust its position more flexibly during the plugging process and improving the connection success rate.

[0085] Specifically, in this embodiment, the floating connection forms between the fixed plate 13 and the floating plate 14, the movable plate 111 and the floating plate 14, and the electrical connection assembly 15 and the fixed plate 13 are all realized by spring connections. Taking the fixed plate 13 and the floating plate 14 as an example, one end of the spring is connected to the fixed plate 13, and the other end is connected to the floating plate 14. The elasticity of the spring enables the floating plate 14 to float relative to the fixed plate 13 in the height direction of the battery pack 2.

[0086] Embodiment 2

[0087] This embodiment discloses an electric vehicle, which includes a battery compartment for accommodating the battery pack 2. The battery pack 2 is fixed in the battery compartment through a locking mechanism. Here, the battery compartment only refers to the position where the battery pack 2 is located, which may be a corresponding frame structure or just a receiving space. A vehicle-end connection device 1 is provided in this battery compartment, and the vehicle-end connection device 1 is the same as the connection device 1 of the battery rack in Embodiment 1.

[0088] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that this is only an example, and the protection scope of the present invention is defined by the appended claims. Without departing from the principle and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A connecting device, characterized in that, include: A liquid cooling connection assembly, used to connect with the liquid cooling pipeline of the battery pack to transport coolant; An in-place detector is used to detect whether the liquid cooling connection assembly is in place when plugged into the liquid cooling pipeline.

2. The connecting device according to claim 1, characterized in that, There are two liquid-cooling connection assemblies, which are arranged at intervals along the width direction of the battery pack. The two liquid-cooling connection assemblies are connected and plugged with the corresponding liquid cooling pipelines to form a liquid cooling circulation path; there are two in-place detectors, which are respectively arranged on one side of the liquid-cooling connection assembly.

3. The connecting device according to claim 1, characterized in that, The connecting device also includes a fixed plate and a floating plate disposed on the fixed plate and movable relative to the fixed plate along the height direction of the battery pack. The liquid cooling connection assembly and the in-place detector are both disposed on the floating plate.

4. The connecting device according to claim 3, characterized in that, The in-place detector includes a detection portion and a telescopic portion, wherein the telescopic portion can abut against the battery pack during the plugging process of the liquid-cooling connection assembly and the liquid-cooling pipeline and can move in a direction opposite to the plugging direction, so that the sensing element on the telescopic portion moves with it until it is sensed by the detection portion to confirm that the liquid-cooling connection assembly and the liquid-cooling pipeline are in-place; Preferably, the liquid cooling connection assembly is arranged on a side of the floating plate facing the battery pack, the detection portion is arranged on a side of the floating plate facing away from the battery pack, the telescopic portion is located above the floating plate and penetrates the fixed plate, and an end of the telescopic portion and the liquid cooling connection assembly located on the same side can abut against the battery pack during the plugging process to drive the telescopic portion to move, and an end of the telescopic portion and the detection portion located on the same side is provided with the induction member; Preferably, the in-place detector also includes a connecting part connected to the floating plate and a fixed part arranged on the connecting part, the fixed part includes a horizontal plate and two vertical plates arranged on the horizontal plate, the detection part is installed on the horizontal plate, the two vertical plates are arranged opposite to each other, the telescopic part is passed through the two vertical plates and the sensing element is located between the two vertical plates.

5. The connecting device according to claim 4, characterized in that, The fixing plate is provided with a mounting hole, which is in a long waist shape and has a waist-shaped direction along the height direction of the battery pack. The outer diameter of the abutting end of the telescopic portion abutting against the battery pack is larger than the hole diameter of the mounting hole.

6. The connecting device according to claim 5, characterized in that, The abutting end is spherical, and the spherical surface faces the battery pack; And / or, the abutting end is detachable relative to the main body of the telescopic part.

7. The connecting device according to claim 3, characterized in that, The liquid cooling connection assembly includes a movable plate, a liquid cooling interface arranged on the movable plate and two positioning columns. The end corners of the movable plate can be floatingly connected to the floating plate. The liquid cooling interface is used to be connected to the liquid cooling pipeline. The positioning columns are respectively located on both sides of the liquid cooling interface.

8. The connecting device according to claim 3, wherein The connecting device also includes an electrical connection component, which is used to dock with the electrical connection head of the battery pack to transmit electrical energy. The electrical connection component is arranged between the two liquid-cooled connection components and is floatingly connected to the fixed plate. The electrical connection component can float in the width direction and / or height direction of the battery pack.

9. A battery holder, characterized in that, It comprises a connecting device as claimed in any one of claims 1 to 8.

10. An electric vehicle, characterized in that, It comprises a connecting device as claimed in any one of claims 1 to 8.

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