Liquid-cooled battery box and battery pack

Abstract

The present invention discloses a liquid-cooled battery box and a battery pack. The liquid-cooled battery box includes a box, the box includes a first box and a second box, one end of the first box is connected to one end of the second box, the first box has a first receiving slot with an opening at one end, the first receiving slot is used to receive a battery management system, the second box has a second receiving slot with an opening at one end, the second receiving slot is used to receive a battery module, the notch of the first receiving slot and the notch of the second receiving slot face oppositely, the bottom of the first receiving slot and the bottom of the second receiving slot are both provided with a cooling liquid flow channel, the cooling liquid flow channel of the first box and the cooling liquid flow channel of the second box are in communication, and the cooling liquid flow channel is used to circulate cooling liquid. It optimizes the internal space of the box and has high safety.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a liquid-cooled battery box and a battery pack comprising the liquid-cooled battery box. Background Art

[0002] At present, battery packs are widely used in vehicles due to their excellent high energy density and high cycle life. The battery pack includes a battery case, a battery module and a battery management system (Battery Management System). The battery module and the battery management system are arranged in the receiving slot of the battery case. The battery module will generate heat when charging and discharging and when the battery management system is running, so the battery module and the battery management system need to be cooled. Liquid cooling is a commonly used cooling method for battery packs. For battery packs with a height difference between the mounting plane of the battery module and the mounting plane of the battery management system, a structure combining a cold liquid plate and a pipeline is usually adopted. However, the combination of the cold liquid plate and the pipeline occupies a large space inside the battery case, and the risk of leakage is relatively large. It is easy to cause a short circuit in the battery pack due to leakage, and the safety is low. Summary of the invention

[0003] The object of the present invention is to provide a liquid-cooled battery box and a battery pack, which optimize the internal space of the box and have high safety.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] On the one hand, a liquid-cooled battery box is provided, including a box, wherein the box includes a first box and a second box, one end of the first box is connected to one end of the second box, the first box has a first receiving groove with an opening at one end, the first receiving groove is used to receive a battery management system, the second box has a second receiving groove with an opening at one end, the second receiving groove is used to receive a battery module, the notch of the first receiving groove and the notch of the second receiving groove are in opposite directions, the bottom of the first receiving groove and the bottom of the second receiving groove are both provided with cooling liquid flow channels, the cooling liquid flow channel of the first box is in communication with the cooling liquid flow channel of the second box, and the cooling liquid flow channel is for cooling liquid to circulate.

[0006] As a preferred technical solution for the liquid-cooled battery box, two connecting channels are provided at one end where the first box is connected to the second box, and the connecting channels extend along the height direction of the box. The connecting channels are connected to the cooling liquid flow channel of the first box and the cooling liquid flow channel of the second box, and the flow directions of the cooling liquid in the two connecting channels are opposite.

[0007] As a preferred technical solution of the liquid-cooled battery box, the box also includes a liquid outlet connector and a liquid inlet connector, the liquid outlet connector and the liquid inlet connector are both arranged on the same side of the first box, and the liquid outlet connector and the liquid inlet connector are both integrally formed with the first box.

[0008] As a preferred technical solution for the liquid-cooled battery box, the liquid outlet joint and the liquid inlet joint are spaced apart along the width direction of the box, and a first partition is arranged between the liquid outlet joint and the liquid inlet joint in the cooling liquid flow channel of the first box, and the first partition separates the cooling liquid flow channel of the first box into a liquid outlet flow channel and a liquid inlet flow channel, wherein one of the connecting channels is connected to the liquid outlet flow channel, and the other connecting channel is connected to the liquid inlet flow channel.

[0009] As a preferred technical solution for the liquid-cooled battery box, a plurality of second partitions are arranged in the liquid inlet channel, the liquid outlet channel and the cooling liquid channel of the second box, and the second partitions are parallel to the length direction of the box. The plurality of second partitions in the liquid outlet channel, the plurality of second partitions in the liquid inlet channel and the plurality of second partitions in the second box are spaced apart along the width direction of the box to separate the liquid outlet channel, the liquid inlet channel and the cooling liquid channel of the second box into a plurality of channel splits, and the respective channel splits in the liquid outlet channel are interconnected, the respective channel splits in the liquid inlet channel are interconnected, and the respective channel splits in the second box are interconnected.

[0010] As a preferred technical solution for the liquid-cooled battery box, a third partition is arranged at the bottom of the second accommodating groove, and the third partition is located between two adjacent second partitions, and the flow channel split is formed between the third partition and the second partition, one end of the third partition is connected to the coolant flow channel of the second box body close to the side wall of the first box body, and the other end of the third partition is spaced from the coolant flow channel of the second box body relative to the side wall of the first box body.

[0011] As a preferred technical solution of the liquid-cooled battery box, the bottom of the first receiving groove has a first bottom plate, the first bottom plate has a first plate and a second plate, the battery management system abuts against the first plate, a first groove is concavely provided on a side of the first plate away from the battery management system, the notch of the first groove is opposite to the notch of the first receiving groove, the second plate blocks the notch of the first groove, and the coolant flow channel is formed between the bottom of the first groove and the second plate;

[0012] The bottom of the second receiving groove has a second bottom plate, the second bottom plate has a third plate and a fourth plate, the battery module is abutted against the third plate, and a second groove is recessed on the side of the third plate away from the battery module, the notch of the second groove is in the opposite direction to the notch of the second receiving groove, the third plate blocks the notch of the second groove, and the coolant flow channel is formed between the bottom of the second groove and the fourth plate.

[0013] As a preferred technical solution of the liquid-cooled battery box, the first partition plate and the bottom of the first groove are integrally formed;

[0014] And / or, the second partition plate is integrally formed with the groove bottom of the first groove or the groove bottom of the second groove;

[0015] And / or, the third partition plate is integrally formed with the bottom of the second groove.

[0016] As a preferred technical solution of the liquid-cooled battery box, the second plate is welded to the notch of the first groove, and the third plate is welded to the notch of the second groove.

[0017] On the other hand, a battery pack is also provided, including a liquid-cooled battery box.

[0018] The beneficial effects of the present invention are as follows: since the bottom of the first containing tank and the bottom of the second containing tank are both provided with cooling liquid flow channels, and the cooling liquid flow channels of the first box body are interconnected with the cooling liquid flow channels of the second box body, the cooling liquid flow channels are integrated inside the box body, and the input of cooling liquid into the cooling liquid flow channels can simultaneously cool down the battery management system and the battery module inside the box body, and no pipes and quick connectors for conveying cooling liquid are required inside the box body, thereby preventing leakage of the pipes inside the box body, saving materials for making the cooling liquid assembly, preventing the pipes from occupying the space inside the box body, and optimizing the space inside the box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the liquid-cooled battery box at one angle described in the embodiment.

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the liquid-cooled battery box from another angle described in the embodiment.

[0022] Figure 3 This is an exploded view from one angle of the liquid-cooled battery box described in the embodiment when the battery module and the second cover are removed.

[0023] Figure 4This is an exploded view from another angle when the battery management system and the first cover plate are removed from the liquid-cooled battery box described in the embodiment.

[0024] Figure 5 This is an overall exploded view of the liquid-cooled battery box described in the embodiment.

[0025] Figure 6 for Figure 3 Enlarged view of point A in the middle.

[0026] Figure 7 for Figure 4 Enlarged view of point B in the middle.

[0027] In the figure:

[0028] 100. Box body; 200. Battery management system; 300. Battery module;

[0029] 1. First box body; 11. First bottom plate; 111. First plate; 112. Second plate; 113. First groove; 12. First cover plate; 13. First receiving groove; 14. First side plate; 15. First step surface; 16. Second step surface; 2. Second box body; 21. Second bottom plate; 211. Third plate; 212. Fourth plate; 213. Second groove; 22. Second cover plate; 23. Second receiving groove; 24. Second side plate; 25. Third step surface; 26. Fourth step surface; 3. Liquid inlet joint; 4. Liquid outlet joint; 5. First partition plate; 6. Connecting channel; 7. Second partition plate; 8. Third partition plate; 9. Cooling liquid flow channel; 10. Heat transfer plate. DETAILED DESCRIPTION

[0030] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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, it can be the internal connection of two elements or the interaction relationship between 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.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] like Figures 1 to 7 As shown, the present invention provides a liquid-cooled battery box, including a box 100, the box 100 includes a first box 1 and a second box 2, one end of the first box 1 is connected to one end of the second box 2, the first box 1 has a first receiving groove 13 with an opening at one end, the first receiving groove 13 is used to receive the battery management system 200, the second box 2 has a second receiving groove 23 with an opening at one end, the second receiving groove 23 is used to receive the battery module 300, and the notch of the first receiving groove 13 is opposite to the notch of the second receiving groove 23. The notch cover of the first receiving groove 13 is provided with a first cover plate 12, and the notch cover of the second receiving groove 23 is provided with a second cover plate 22. Among them, the first receiving groove 13 is formed by the first bottom plate 11 and the first side plate 14, and the second receiving groove 23 is formed by the second bottom plate 21 and the second side plate 24. The bottom of the first receiving groove 13 (i.e., the inside of the first bottom plate 11) and the bottom of the second receiving groove 23 (i.e., the inside of the second bottom plate 21) are both provided with a cooling liquid flow channel 9, and the cooling liquid flow channel 9 of the first box body 1 is in communication with the cooling liquid flow channel 9 of the second box body 2, and the cooling liquid flow channel 9 is for the circulation of cooling liquid. In this embodiment, the first box body 1 and the second box body 2 are provided, and the notch of the first receiving groove 13 is in the opposite direction to the notch of the second receiving groove 23, so that the mounting surface of the battery management system 200 and the mounting surface of the battery module 300 are located on different planes, and even if there is a height difference between the battery management system 200 and the battery module 300, the installation requirements can be met. Since the bottom of the first receiving tank 13 and the bottom of the second receiving tank 23 are both provided with a coolant flow channel 9, and the coolant flow channel 9 of the first box body 1 is connected to the coolant flow channel 9 of the second box body 2, the coolant flow channel 9 is integrated inside the box body 100, and the coolant input into the coolant flow channel 9 can simultaneously cool down the battery management system 200 and the battery module 300 inside the box body 100. There is no need to set any pipes and quick connectors for conveying coolant inside the box body 100, which prevents the pipes from leaking inside the box body 100, saves the manufacturing materials of the coolant assembly, prevents the pipes from occupying the space inside the box body 100, and optimizes the space inside the box body 100.

[0034] In this embodiment, a heat conducting plate 10 is provided between the bottom of the first receiving tank 13 and the battery management system 200 and between the bottom of the second receiving tank 23 and the battery module 300 system. The heat conducting plate 10 is beneficial for transferring heat between the battery management system 200 or the battery module 300 and the cooling liquid, thereby ensuring the cooling efficiency.

[0035] In one embodiment, two connecting channels 6 are provided at one end where the first housing 1 and the second housing 2 are connected. The connecting channels 6 extend along the height direction of the housing 100. The connecting channels 6 are connected to the cooling liquid flow channel 9 of the first housing 1 and the cooling liquid flow channel 9 of the second housing 2. The flow directions of the cooling liquid in the two connecting channels 6 are opposite. The cooling liquid in the bottom of the first receiving tank 13 flows from one of the connecting channels 6 to the bottom of the second receiving tank 23, and then flows from the other connecting channel 6 to the bottom of the first receiving tank 13, so that the cooling liquid can flow between the bottom of the first receiving tank 13 and the bottom of the second receiving tank 23. Figure 2 , the X direction in the figure is the width direction of the box 100, the Y direction in the figure is the length direction of the box 100, and the Z direction in the figure is the height direction of the box 100.

[0036] Specifically, the box 100 further includes a liquid outlet joint 4 and a liquid inlet joint 3, both of which are arranged on the same side of the first box 1, and both of which are integrally formed with the first box 1. It can be understood that the cooling liquid is cooled by a liquid cooling unit arranged outside the box 100, the liquid output end of the liquid cooling unit is connected to the liquid inlet joint 3 on the box 100, the liquid input end of the liquid cooling unit is connected to the liquid outlet joint 4 on the box 100, the cooling liquid inside the liquid cooling unit enters the cooling liquid flow channel 9 of the first box 1 from the liquid inlet joint 3, the cooling liquid flows from one of the connecting channels 6 to the cooling liquid flow channel 9 of the second box 2, and flows from another connecting channel 6 to the cooling liquid flow channel 9 of the first box 1, and is finally transported from the liquid outlet joint 4 to the liquid cooling unit. The liquid outlet joint 4 and the liquid inlet joint 3 are arranged on the same side of the first housing 1, which is conducive to shortening the distance between the liquid cooling unit and the liquid outlet joint 4 and between the liquid cooling unit and the liquid inlet joint 3, and is convenient for connecting the liquid cooling unit with the housing 100. In addition, since the liquid outlet joint 4 and the liquid inlet joint 3 are integrally formed with the first housing 1, leakage caused by a connection gap between the liquid outlet joint 4 or the liquid inlet joint 3 and the first housing 1 is prevented, thereby ensuring the safety of the housing 100. In this embodiment, the liquid outlet joint 4 and the liquid inlet joint 3 are both arranged on the side of the first housing 1 away from the second housing 2. Of course, in other embodiments, the liquid outlet joint 4 and the liquid inlet joint 3 can also be arranged on both sides of the first housing 1, or the liquid outlet joint 4 and the liquid inlet joint 3 can be arranged on the second housing 2, or one of the liquid outlet joint 4 and the liquid inlet joint 3 can be arranged on the first housing 1, and the other of the liquid outlet joint 4 and the liquid inlet joint 3 can be arranged on the second housing 2. The specific positions of the liquid outlet joint 4 and the liquid inlet joint 3 are not limited here.

[0037] In one embodiment, the liquid outlet joint 4 and the liquid inlet joint 3 are spaced apart along the width direction of the box body 100, and a first partition 5 is provided between the liquid outlet joint 4 and the liquid inlet joint 3 in the coolant flow channel 9 of the first box body 1. The first partition 5 separates the coolant flow channel 9 of the first box body 1 into a liquid outlet flow channel and a liquid inlet flow channel, wherein one connecting channel 6 is connected to the liquid outlet flow channel, and the other connecting channel 6 is connected to the liquid inlet flow channel. The temperature of the cooling liquid in the liquid inlet flow channel is relatively low, and the temperature of the cooling liquid flowing to the liquid outlet flow channel is relatively high. The first partition 5 is provided to separate the inside of the coolant flow channel 9 into a liquid inlet flow channel and a liquid outlet flow channel, so as to prevent the low-temperature coolant from mixing with the high-temperature coolant in the coolant flow channel 9, so as to improve the heat exchange efficiency between the box body 100 and the coolant.

[0038] Specifically, a plurality of second partitions 7 are provided in the liquid inlet channel, the liquid outlet channel, and the cooling liquid channel 9 of the second housing 2. The second partitions 7 are parallel to the length direction of the housing 100. The plurality of second partitions 7 in the liquid outlet channel, the plurality of second partitions 7 in the liquid inlet channel, and the plurality of second partitions 7 in the second housing 2 are spaced apart along the width direction of the housing 100 to separate the liquid outlet channel, the liquid inlet channel, and the cooling liquid channel 9 of the second housing 2 into a plurality of channel splits. The channel splits in the liquid outlet channel are interconnected, the channel splits in the liquid inlet channel are interconnected, and the channel splits in the second housing 2 are interconnected. The liquid outlet channel, the liquid inlet channel, and the cooling liquid channel 9 of the second housing 2 are separated into a plurality of channel splits by the second partitions 7, extending the path for the cooling liquid to circulate inside the housing 100, and effectively improving the efficiency of heat exchange between the cooling liquid and the housing 100. Specifically, the two ends of the second partition plate 7 inside the bottom of the first receiving tank 13 are respectively spaced from the corresponding side walls of the coolant flow channel 9, and the two ends of the second partition plate 7 inside the bottom of the second receiving tank 23 are respectively spaced from the corresponding side walls of the coolant flow channel 9. It should be noted that the second partition plate 7 inside the bottom of the first receiving tank 13 corresponds to the coolant flow channel 9 inside the bottom of the first receiving tank 13, and the second partition plate 7 inside the bottom of the second receiving tank 23 corresponds to the coolant flow channel 9 inside the bottom of the second receiving tank 23.

[0039] In order to prevent the cooling liquid from entering the bottom of the second receiving tank 23 and then directly flowing out from the connecting channel 6 to the bottom of the first receiving tank 13, a third partition 8 is provided at the bottom of the second receiving tank 23. The third partition 8 is located between two adjacent second partitions 7, and a flow channel split is formed between the third partition 8 and the second partition 7. One end of the third partition 8 is connected to the cooling liquid flow channel 9 of the second box body 2 near the side wall of the first box body 1, and the other end of the third partition 8 is spaced from the cooling liquid flow channel 9 of the second box body 2 relative to the side wall of the first box body 1, so that the cooling liquid can flow in this gap. The third partition 8 blocks the cooling liquid flow opening of the bottom of the second receiving tank 23 near the side wall of the first box body 1, preventing the cooling liquid from directly flowing to the bottom of the first receiving tank 13 without flowing through the flow channel split inside the bottom of the second receiving tank 23, thereby further improving the cooling efficiency of the cooling liquid.

[0040] In order to reduce the processing difficulty of the coolant flow channel 9 and the connecting channel 6 inside the box 100, the first bottom plate 11 and the second bottom plate 21 are set to a double-layer structure. Among them, the first bottom plate 11 has a first plate 111 and a second plate 112, the battery management system 200 is in contact with the first plate 111, and the first plate 111 is provided with a first groove 113 on the side away from the battery management system 200. The notch of the first groove 113 is opposite to the notch of the first receiving groove 13, and the second plate 112 blocks the notch of the first groove 113, and the coolant flow channel 9 is formed between the bottom of the first groove 113 and the second plate 112. Specifically, one side of the first partition 5 and the second partition 7 inside the bottom of the first receiving groove 13 are connected to the bottom of the first groove 113, and the ends of the first partition 5 and the second partition 7 opposite to the bottom of the first groove 113 are connected to the second plate 112. In this embodiment, the first partition plate 5 and the second partition plate 7 inside the bottom of the first accommodating groove 13 are integrally formed with the bottom of the first groove 113, such as by extrusion molding or stamping molding, and the ends of the first partition plate 5 and the second partition plate 7 opposite to the bottom of the first groove 113 are welded to the second plate 112 by stir friction welding.

[0041] The second receiving groove 23 has a second bottom plate 21 at the bottom, and the second bottom plate 21 has a third plate 211 and a fourth plate 212. The battery module 300 abuts against the third plate 211. The third plate 211 is provided with a second groove 213 on the side away from the battery module 300. The notch of the second groove 213 faces the opposite direction to the notch of the second receiving groove 23. The third plate 211 blocks the notch of the second groove 213. A coolant flow channel 9 is formed between the groove bottom of the second groove 213 and the fourth plate 212. Specifically, one end of the second partition plate 7 and the third partition plate 8 inside the groove bottom of the second receiving groove 23 are both connected to the groove bottom of the second groove 213, and the ends of the second partition plate 7 and the third partition plate 8 opposite to the groove bottom of the second groove 213 are both connected to the fourth plate 212. In this embodiment, one end of the second partition plate 7 and the third partition plate 8 inside the bottom of the second accommodating groove 23 are integrally formed with the bottom of the second groove 213, such as by extrusion molding or stamping molding, and the ends of the second partition plate 7 and the third partition plate 8 opposite to the bottom of the second groove 213 are welded to the fourth plate 212 by stirring welding.

[0042] The first bottom plate 11 and the second bottom plate 21 are set as a double-layer structure. After the grooves and partitions are processed, the plate body can be sealed at the notches corresponding to the grooves, which is convenient for processing the coolant flow channel 9 and the connecting channel 6.

[0043] In this embodiment, refer to Figure 6 and Figure 7The second plate 112 is welded to the notch of the first groove 113, and the third plate 211 is welded to the notch of the second groove 213. Specifically, the second plate 112 is welded to the notch of the first groove 113 by friction welding, and the third plate 211 is welded to the notch of the second groove 213 by friction welding. The notch of the groove is blocked by welding to ensure the reliability of the connection between the two plates and prevent leakage.

[0044] In order to facilitate the assembly of the second plate 112 and the first plate 111, the notch of the first groove 113 is provided with a first step structure, which includes a first step surface 15 and a second step surface 16 vertically connected to the first step surface 15. The first step surface 15 is parallel to the groove bottom of the first groove 113, and the first step surface 15 is located at one end of the second step surface 16 close to the groove bottom of the first groove 113. The side surface of the second plate 112 close to the first receiving groove 13 abuts against the first step surface 15, and the edge of the second plate 112 abuts against the second step surface 16. The first step surface 15 and the second step surface 16 constitute a first step structure, which provides positioning for the assembly of the second plate 112. During the specific assembly, the first step surface 15 and the second step surface 16 are welded at the position where the second plate 112 abuts against the second plate 112, so that the second plate 112 blocks the first groove 113. The first step surface 15 and the second step surface 16 provide space for the welding of the second plate 112, increase the welding area, and improve the reliability of the welding of the first plate 111 and the second plate 112. In this embodiment, the first side plate 14 is arranged around the outer periphery of the first plate 111, and one end of the first side plate 14 away from the slot of the first receiving groove 13 protrudes from the first plate 111, forming a first step structure between the first plate 111 and the first side plate 14, and the side of the first plate 111 away from the first receiving groove 13 is a first step surface 15, and the side of the first side plate 14 connected to the first plate 111 is a second step surface 16.

[0045] Specifically, the notch of the second groove 213 is provided with a second step structure, the second step structure includes a third step surface 25 and a fourth step surface 26 vertically connected to the third step surface 25, the third step surface 25 is parallel to the groove bottom of the second groove 213, and the third step surface 25 is close to the fourth step surface 26 close to the groove bottom of the second groove 213, the side surface of the fourth plate 212 close to the second receiving groove 23 abuts against the third step surface 25, and the edge of the fourth plate 212 abuts against the fourth step surface 26. During specific assembly, the third step surface 25 and the fourth step surface 26 are welded at the positions where the fourth plate 212 abuts, the second step structure can assist the fourth plate 212 to quickly abut against the third plate 211, and the third step surface 25 and the fourth step surface 26 provide sufficient welding area for the fourth plate 212 to ensure the reliability of the fourth plate 212 blocking the notch of the second groove 213. In this embodiment, the second side plate 24 protrudes from the third plate 211 at one end away from the second accommodating groove 23, forming a second step structure between the third plate 211 and the second side plate 24, and the side surface of the third plate 211 away from the second accommodating groove 23 is a third step surface 25, and the side surface where the second side plate 24 and the third plate 211 are connected is a fourth step surface 26.

[0046] In this embodiment, a battery pack is also provided, including a liquid-cooled battery box of any of the above structures. Since the liquid-cooled battery box is provided with a coolant flow channel 9 inside the bottom of the first receiving tank 13 and the bottom of the second receiving tank 23, the arrangement of the pipeline inside the box 100 is omitted, the space inside the box 100 is optimized, and good safety is achieved.

[0047] In the description herein, it should be understood that the terms "upper", "lower", "left", "right", etc., and the like, are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0048] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0049] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0050] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A liquid-cooled battery box, characterized in that , comprising a box, the box comprising a first box and a second box, one end of the first box is connected to one end of the second box, the first box has a first receiving groove with an opening at one end, the first receiving groove is used to receive a battery management system, the second box has a second receiving groove with an opening at one end, the second receiving groove is used to receive a battery module, the notch of the first receiving groove and the notch of the second receiving groove are in opposite directions, the bottom of the first receiving groove and the bottom of the second receiving groove are both provided with a cooling liquid flow channel, the cooling liquid flow channel of the first box is in communication with the cooling liquid flow channel of the second box, and the cooling liquid flow channel is for cooling liquid to flow; Two communication channels are provided at one end of the first box body connected to the second box body, the communication channels extend along the height direction of the box body, the communication channels are connected with the cooling liquid flow channel of the first box body and the cooling liquid flow channel of the second box body, and the flow directions of the cooling liquid in the two communication channels are opposite; The box body further includes a liquid outlet joint and a liquid inlet joint, wherein the liquid outlet joint and the liquid inlet joint are both arranged on the same side of the first box body, and the liquid outlet joint and the liquid inlet joint are both integrally formed with the first box body; The cooling liquid is cooled by a liquid cooling unit arranged outside the box, the liquid output end of the liquid cooling unit is connected to the liquid inlet joint on the box, the liquid input end of the liquid cooling unit is connected to the liquid outlet joint on the box, the cooling liquid inside the liquid cooling unit enters the cooling liquid flow channel of the first box from the liquid inlet joint, the cooling liquid flows from one of the connecting channels to the cooling liquid flow channel of the second box, and flows from the other connecting channel to the cooling liquid flow channel of the first box, and is finally transported from the liquid outlet joint to the liquid cooling unit; Along the width direction of the box body, the liquid outlet joint and the liquid inlet joint are respectively spaced apart, and a first partition is arranged between the liquid outlet joint and the liquid inlet joint in the coolant flow channel of the first box body, and the first partition separates the coolant flow channel of the first box body into a liquid outlet flow channel and a liquid inlet flow channel, wherein one of the connecting channels is connected to the liquid outlet flow channel, and the other connecting channel is connected to the liquid inlet flow channel.

2. The liquid-cooled battery box according to claim 1, characterized in that: A plurality of second partitions are arranged in the liquid inlet channel, the liquid outlet channel and the cooling liquid channel of the second box, and the second partitions are parallel to the length direction of the box. The plurality of second partitions in the liquid outlet channel, the plurality of second partitions in the liquid inlet channel and the plurality of second partitions in the second box are spaced apart along the width direction of the box to separate the liquid outlet channel, the liquid inlet channel and the cooling liquid channel of the second box into a plurality of channel splits, and the respective channel splits in the liquid outlet channel are interconnected, the respective channel splits in the liquid inlet channel are interconnected, and the respective channel splits in the second box are interconnected.

3. The liquid-cooled battery box according to claim 2, characterized in that: A third partition is provided at the bottom of the second containing groove, and the third partition is located between two adjacent second partitions, and the flow channel split is formed between the third partition and the second partition, one end of the third partition is connected to the coolant flow channel of the second box body close to the side wall of the first box body, and the other end of the third partition is spaced from the coolant flow channel of the second box body relative to the side wall of the first box body.

4. The liquid-cooled battery box according to claim 3, characterized in that: The bottom of the first receiving groove has a first bottom plate, the first bottom plate has a first plate and a second plate, the battery management system abuts against the first plate, a first groove is concavely formed on a side of the first plate away from the battery management system, the notch of the first groove is opposite to the notch of the first receiving groove, the second plate blocks the notch of the first groove, and the coolant flow channel is formed between the bottom of the first groove and the second plate; The bottom of the second receiving groove has a second bottom plate, the second bottom plate has a third plate and a fourth plate, the battery module is abutted against the third plate, and a second groove is recessed on the side of the third plate away from the battery module, the notch of the second groove is in the opposite direction to the notch of the second receiving groove, the third plate blocks the notch of the second groove, and the coolant flow channel is formed between the bottom of the second groove and the fourth plate.

5. The liquid-cooled battery box according to claim 4, characterized in that: The first partition plate is integrally formed with the bottom of the first groove; And / or, the second partition plate is integrally formed with the groove bottom of the first groove or the groove bottom of the second groove; And / or, the third partition plate is integrally formed with the bottom of the second groove.

6. The liquid-cooled battery box according to claim 4, characterized in that: The second plate is welded to the notch of the first groove, and the third plate is welded to the notch of the second groove.

7. A battery pack, characterized in that: A liquid-cooled battery box comprising any one of claims 1 to 6.

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