Liquid-cooled battery box and battery pack assembly

Abstract

The utility model relates to a liquid-cooled battery box and a battery pack assembly, the box comprises a main body, the main body comprises a cover piece, a coaming and a bottom plate, the lower end of the coaming is connected with the bottom plate to form an accommodating space for installing a battery module, the upper end of the coaming is connected with the cover piece, and the cover piece is connected with the bottom plate. The cover part is used for installing the battery module in the accommodating space in a sealing manner, the bottom plate comprises at least one connecting plate, the connecting plate is used for circulating a cooling medium, at least two separators are arranged in the accommodating space, and the separators are in contact and connected with the left side and the right side of the battery module; the battery pack assembly comprises the box body and a plurality of battery modules installed in the box body, the structure is simple, the space utilization rate of the box body is improved, and the battery pack assembly has stable and efficient cooling efficiency.

Description

Technical Field

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

[0002] A battery module includes multiple battery cells connected in series and parallel. Several battery modules are installed in a box to form a larger capacity energy storage unit. The battery module will generate heat during the charging and discharging process. A continuous high temperature working environment will affect the cycle life of the battery module. In severe cases, it will cause safety accidents such as combustion and explosion. Therefore, the battery module needs to be cooled.

[0003] The battery modules are arranged closely, and a fixed structure is needed to fix the battery modules inside the box. At the same time, a cooling system is needed to cool the battery modules. Due to the limited space inside the box, more structures will lead to low space utilization, increase the overall weight and size of the box, and when the number of battery modules is large, the cooling consistency of the battery modules cannot be guaranteed, which has certain limitations. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a liquid-cooled battery box and battery pack assembly, which has strong functional integration, improves the space utilization of the box, and can efficiently cool the battery to ensure the service life of the battery.

[0005] The utility model provides a liquid-cooled battery box, comprising a main body, wherein the main body comprises a cover, a surrounding plate and a bottom plate, wherein the lower end of the surrounding plate is connected to the bottom plate to form a storage space for installing a battery module, the upper end of the surrounding plate is connected to the cover, and the cover is used to seal and install the battery module in the storage space, the bottom plate comprises at least one connecting plate, and the connecting plate is used to circulate a cooling medium, and at least two partitions are arranged in the storage space, the partitions are in contact with and connected to the left and right sides of the battery module, the partitions are used to circulate a cooling medium, and the partitions are communicated with the connecting plates.

[0006] In one embodiment, when the number of the connecting plates is two or more, the connecting plates are connected along the left-right direction.

[0007] In one embodiment, a first pipe assembly and a second pipe assembly are provided in the accommodating space, and the first pipe assembly and the second pipe assembly are used to connect the connecting plate and the partition. The first pipe assembly includes a medium inlet pipe and a medium outlet pipe. The medium inlet pipe is used to connect with a medium storage device outside the accommodating space, and the medium outlet pipe is used to connect with the outside of the accommodating space. The cooling medium can enter the connecting plate and the partition through the medium inlet pipe and be discharged through the medium outlet pipe.

[0008] In one embodiment, the first pipe assembly further includes a plurality of first medium branch pipes, and the medium inlet pipe is connected to the partition through the first medium branch pipes.

[0009] In one embodiment, the first pipe assembly further includes a plurality of connecting pipes, and the connecting plate is connected to the medium outlet pipe through the connecting pipes.

[0010] In one embodiment, the second pipe assembly includes a second medium branch pipe and a third medium branch pipe, the second medium branch pipe is communicated with the partition, and the second medium branch pipe is communicated with the connecting plate through the third medium branch pipe.

[0011] In one embodiment, the first tube assembly is located at the front side of the accommodating space, the second tube assembly is located at the rear side of the accommodating space, the cooling medium enters the partition through the medium inlet pipe, enters the connecting plate through the second tube assembly, and is discharged through the medium outlet pipe.

[0012] In one embodiment, the enclosure includes a first side panel and a second side panel that are relatively arranged along a front-to-rear direction, and a third side panel and a fourth side panel that are relatively arranged along a left-to-right direction.

[0013] In one embodiment, the third side panel and the fourth side panel both include a plate body and a reinforcement member, the reinforcement member includes a first support beam and a second support beam, the first support beam and the second support beam are located on a side of the plate body away from the accommodating space, and are spaced apart in the up and down directions.

[0014] The utility model also provides a battery pack assembly, including a plurality of battery modules and the above-mentioned liquid-cooled battery box, wherein the battery modules are installed in the accommodating space of the main body.

[0015] The beneficial effects of the liquid-cooled battery box proposed by the utility model are:

[0016] At least two connecting plates can support the battery module, so as to cooperate with the enclosure and the cover to install the battery module. The connecting plates are used to circulate the cooling medium, so as to perform heat exchange cooling on the bottom of the battery module.

[0017] A separator is provided in the accommodation space of the main body. The separator is located on the left and right sides of the battery module and can separate and fix the battery module. The separator is used to circulate the cooling medium. The separator can perform heat exchange cooling on the left and right sides of the battery module. The separator has good functional integration, which is conducive to reducing the overall weight of the main body and its internal battery module.

[0018] The connecting plate and the separator cooperate to increase the heat exchange area, thereby efficiently cooling the battery module to ensure the service life of the battery module;

[0019] The separator is connected to the connecting plate, and the cooling medium can flow between the separator and the connecting plate, which improves the stability and consistency of heat exchange of the battery module and has high heat exchange efficiency.

[0020] The beneficial effects of the battery pack assembly proposed by the utility model are: light overall weight and good cooling consistency, which is beneficial to improving the service life of the battery pack assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of the main body of an embodiment of the utility model;

[0023] Figure 2 It is an exploded schematic diagram of the main body of an embodiment of the utility model;

[0024] Figure 3 Another exploded schematic diagram of the main body of an embodiment of the utility model;

[0025] Figure 4 A schematic diagram of the cooperation between the main body and the battery module of an embodiment of the utility model;

[0026] Figure 5 This is an exploded schematic diagram of a separator and a battery module according to an embodiment of the utility model;

[0027] Figure 6 It is a partial enlarged schematic diagram of a battery module according to an embodiment of the utility model;

[0028] Figure 7 This is a structural schematic diagram of a first pipe assembly according to an embodiment of the utility model;

[0029] Figure 8 It is a structural schematic diagram of a second pipe assembly according to an embodiment of the utility model.

[0030] In the figure:

[0031] 10-main body; 101-accommodating space; 11-cover; 111-insulating layer; 12-first side plate; 13-second side plate; 14-third side plate; 15-fourth side plate; 151-plate body; 152-first support beam; 153-second support beam; 154-connecting beam; 155-first connecting hole; 156-second connecting hole; 157-support seat; 16-connecting plate; 161-fixing beam; 162-module fixing member; 17-separator; 171-first connecting pipe; 172-second connecting pipe; 173-first fixing member; 18-thermal conductive adhesive;

[0032] 20-battery module; 21-battery cell; 22-fixing plate; 221-insulating sheet; 222-second fixing member; 223-module fixing hole; 23-third fixing member;

[0033] 30-first pipe assembly; 31-medium inlet pipe; 32-medium outlet pipe; 33-first medium branch pipe; 34-connecting pipe;

[0034] 40 - second pipe assembly; 41 - second medium branch pipe; 42 - third medium branch pipe. DETAILED DESCRIPTION

[0035] The following will describe in detail a specific embodiment of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] Unless otherwise clearly specified and limited, the terms "disposed", "installed", "connected" and the like 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. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0037] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of description and simplified description, 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 should not be understood as a limitation on the utility model.

[0038] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0039] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0040] As attached Figure 2 As shown in the coordinate system, for the convenience of understanding the positional relationship and connection relationship of the various components in the utility model, the front-to-back direction is defined along the directions D1 and D2, wherein D1 represents the front and D2 represents the back; the left-to-right direction is defined along the directions D3 and D4, wherein D3 represents the left and D4 represents the right; the up-down direction is defined along the directions D5 and D6, wherein D5 represents the top and D6 represents the bottom.

[0041] Combined with Figure 1 To Attachment Figure 3 The liquid-cooled battery box proposed by the utility model includes a main body 10, and the main body 10 includes a cover 11, a panel and a bottom plate. The cover 11, the panel and the bottom plate are connected in the up-down direction. The lower end of the panel is connected with the bottom plate to form a receiving space 101. The receiving space 101 is used to install the battery module 20. The upper end of the panel is connected with the cover 11. The cover 11 is used to seal and install the battery module 20 inside the receiving space 101. The bottom plate includes at least one connecting plate 16. The connecting plate 16 is used to circulate the cooling medium. The battery module 20 is located above the bottom plate. The connecting plate 16 can perform heat exchange cooling on the bottom of the battery module 20. Figure 4 At least two partitions 17 are provided in the accommodating space 101. The partitions 17 are in contact with and connected to the left and right sides of the battery module 20 to isolate and fix the battery module 20. The partitions 17 are used to circulate the cooling medium. The partitions 17 can perform heat exchange cooling on the sides of the battery module 20. The partitions 17 are connected to the connecting plate 16. The partitions 17 cooperate with the connecting plate 16 to perform efficient heat exchange on the battery module 20 and ensure the consistency of cooling of the battery module 20.

[0042] In one example, when the number of connecting plates 16 is two or more, the connecting plates 16 are connected along the left-right direction to form a complete bottom plate. The number of connecting plates 16 can be adjusted according to the capacity requirements of the battery module 20, which has strong flexibility.

[0043] In one example, the cover 11 is made of a steel plate, an aluminum plate, or a composite plate of fiber and resin, which has a simple structure, is easy to process, and has high production efficiency.

[0044] Exemplarily, the cover 11 is detachably connected to the upper end of the enclosure by screwing.

[0045] For example, as shown in the attached Figure 2As shown, an insulating layer 111 is provided between the cover 11 and the battery module 20 , and the insulating layer 111 can prevent the occurrence of leakage and reduce the risk of electric shock.

[0046] In one example, in conjunction with the attached Figure 2 and attached Figure 3 The enclosure includes a first side plate 12 and a second side plate 13 that are oppositely arranged along the front-to-back direction, and a third side plate 14 and a fourth side plate 15 that are oppositely arranged along the left-to-right direction.

[0047] Exemplarily, the first side plate 12 and the second side plate 13 are symmetrically arranged, and the two share a set of molding molds, which greatly reduces the mold opening cost, shortens the processing cycle, and makes the processing simple and convenient, and the production efficiency is high.

[0048] Exemplarily, the third side panel 14 and the fourth side panel 15 are symmetrically arranged, and the two share a set of molding molds, which greatly reduces the mold opening cost, shortens the processing cycle, and makes the processing simple and convenient, and the production efficiency is high.

[0049] For example, the first side plate 12, the second side plate 13, the third side plate 14 and the fourth side plate 15 are connected by welding, and the connection quality is stable, has good stability, and the welding process is simple and easy to operate. Preferably, the stir friction welding method can be used to connect and assemble the enclosure, and the four corners of the enclosure and the bottom plate can be reinforced by arc welding.

[0050] In one example, as shown in the attached Figure 3 As shown, the third side panel 14 and the fourth side panel 15 both include a panel body 151 and a reinforcement member, wherein the reinforcement member is used to increase the structural strength of the panel body 151, and the reinforcement member includes a first support beam 152 and a second support beam 153, wherein the first support beam 152 and the second support beam 153 are located on a side of the panel body 151 away from the accommodating space 101, and are spaced apart in the up and down directions.

[0051] In one example, as shown in the attached Figure 3 As shown, the reinforcement also includes a connecting beam 154, which is located between the first support beam 152 and the second support beam 153. The connecting beam 154 is used to connect the first support beam 152 and the second support beam 153. The connecting beam 154 can increase the connection strength between the first support beam 152 and the second support beam 153.

[0052] Exemplarily, the connection beam 154 is vertically connected to the first support beam 152 and the second support beam 153 .

[0053] Exemplarily, the connection beam 154 is connected to the first support beam 152 and the second support beam 153 by welding.

[0054] Exemplarily, the reinforcement is connected to the plate body 151 as a whole by welding, and the third side panel 14 and the fourth side panel 15 are processed by welding. While ensuring the structural strength, it is beneficial to reduce the overall weight, the process is simple, and the processing efficiency is high.

[0055] Since the capacity requirements of the battery module 20 are different in different application scenarios, the required specifications of the main body 10 are also different. The provision of the reinforcement is conducive to the stacking connection of at least two main bodies 10 in the up and down directions to achieve the expansion of the accommodating space 101. When the at least two main bodies 10 are connected in the up and down directions, the second support beam 153 of the upper enclosure is connected to the first support beam 152 of the lower enclosure. The reinforcement not only increases the structural strength, but also plays a supporting and expansion connection role. It can adapt to the capacity requirements of different vehicle models. The connection is simple and reliable. Stacking two or more main bodies 10 has better structural stability than a main body 10 with two or more layers of battery modules 20. It has a high-strength modal and improves the reliability and safety of the main body 10.

[0056] For example, as shown in the attached Figure 3 As shown, a first connection hole 155 is provided on the first support beam 152, and a second connection hole 156 is provided on the second support beam 153. The first connection hole 155 and the second connection hole 156 are cooperatively connected. Optionally, the first connection hole 155 and the second connection hole 156 are detachably connected by screw connection, so as to facilitate disassembly and assembly according to capacity requirements.

[0057] Optionally, a support seat 157 is provided in the first connection hole 155 , and the support seat 157 is protruded on the first support beam 152 . The support seat 157 can cooperate with the second connection hole 156 to achieve rapid positioning to improve connection efficiency.

[0058] In one example, as shown in the attached Figure 3 As shown, when the bottom plate includes at least two connecting plates 16 connected to the left and right, at least two connecting plates 16 are symmetrically arranged, and the two share a set of forming molds, which greatly reduces the mold opening cost, shortens the processing cycle, and makes the processing simple and convenient, and has high production efficiency.

[0059] In one example, as shown in the attached Figure 5 As shown, the separator 17 and the battery module 20 are connected by a thermally conductive adhesive 18. The thermally conductive adhesive 18 can improve the connection stability between the separator 17 and the battery module 20, which is beneficial to improving the structural strength and mechanical strength of the battery module 20. The thermally conductive adhesive 18 has good thermal conductivity, which is beneficial to the separator 17 to fully exchange heat with the battery module 20.

[0060] Illustratively, when connecting the separator 17 and the battery module 20 , the thermal conductive adhesive 18 may be first applied to the separator 17 , and then the separator 17 and the battery module 20 are connected via the thermal conductive adhesive 18 , and then the thermal conductive adhesive 18 is cured.

[0061] Attached Figure 5 It is a structural schematic diagram of three battery modules 20 cooperating with a separator 17. The separator 17 is connected to the left and right sides of the battery module 20. Two adjacent battery modules 20 share one separator 17, that is, when connected, the left and right sides of the separator 17 are coated with thermal conductive adhesive 18. The two battery modules 20 are connected by one separator 17. Such an arrangement can not only ensure the heat exchange quality of the battery module 20, but also reduce the space occupied, realize the rational use of the accommodating space 101, and ensure that the battery module 20 has good mechanical strength, which is conducive to achieving weight reduction design.

[0062] Combined with Figure 5 and attached Figure 6 The battery module 20 includes a plurality of electrically connected battery cells 21 and two fixing plates 22 distributed along the front-to-back direction. An insulating sheet 221 is provided between the fixing plates 22 and the battery cells 21. The fixing plates 22 and the battery cells 21 are cooperatively connected to form a battery module 20 with a larger capacity.

[0063] When assembling the battery module 20, first fix one of the fixing plates 22 and stick the insulating sheet 221 on it. Then, place the battery cells 21 in sequence along the front-to-back direction to the side of the fixing plate 22 where the insulating sheet 221 is provided. Aerogel or foam is filled between adjacent battery cells 21. Then, stick the insulating sheet 221 on the rearmost end of the battery cell 21 farthest from the fixing plate 22. Finally, fix the other fixing plate 22. The front and rear fixing plates 22 perform pressure-maintaining and shaping on the middle battery cell 21 to complete the assembly of the battery module 20. The specifications and quantity of the battery cells 21 can be adjusted according to actual capacity requirements, and the assembly is flexible.

[0064] To ensure the quality of the connection, Figure 5 As shown, the partition 17 is provided with a first fixing member 173. Figure 6 As shown, the left and right sides of the fixing plate 22 are provided with second fixing parts 222. The first fixing part 173 and the second fixing part 222 cooperate to realize the connection between the battery module 20 and the partition 17. The thermal conductive adhesive 18 can increase the stability of the connection and make the partition 17 fully contact with the battery module 20 to ensure the heat exchange efficiency.

[0065] Exemplarily, the first fixing member 173 is a screw hole, the second fixing member 222 is a bolt, and the separator 17 is connected to the battery module 20 by screw connection, which is easy to operate and has good stability.

[0066] In one example, the fixing plates 22 of two adjacent battery modules 20 are connected by a third fixing member 23 to assemble a number of independent battery modules 20 into a whole to ensure the connection quality of the battery module 20. Compared with the prior art in which the battery modules 20 are fixed by structures such as steel belts, plastic steel belts or metal frames, the overall weight is reduced, and the assembled battery module 20 has good mechanical stability.

[0067] Exemplarily, a fixing hole is formed on the fixing plate 22, and the third fixing member 23 is connected to the fixing hole by screwing.

[0068] In one example, in conjunction with the attached Figure 3 and attached Figure 8 A fixing beam 161 is provided at the upper end of the connecting plate 16, and the fixing beam 161 is used to contact and connect with the battery module 20, so that a gap is left between the lower end of the battery module 20 and the connecting plate 16, and a thermal conductive colloid is coated in the gap to connect the battery module 20 to the connecting plate 16.

[0069] Exemplarily, the fixing beam 161 is fixed to the upper end of the connecting plate 16 by welding.

[0070] For example, as shown in the attached Figure 6 As shown, a module fixing hole 223 is opened on the fixing plate 22, the position of the fixing beam 161 is set corresponding to the position of the fixing plate 22, and a matching hole matching with the module fixing hole 223 is opened on the fixing beam 161. The module fixing hole 223 and the matching hole are connected through the module fixing part 162 to fix the battery module 20 to the connecting plate 16.

[0071] As attached Figure 3 As shown, the accommodation space 101 is provided with a first pipe assembly 30 and a second pipe assembly 40, and the first pipe assembly 30 and the second pipe assembly 40 are both used to communicate with the connecting plate 16 and the partition 17 so that the cooling medium flows between the connecting plate 16 and the partition 17. Figure 7 As shown, the first pipe assembly 30 includes a medium inlet pipe 31 and a medium outlet pipe 32. The medium inlet pipe 31 and the medium outlet pipe 32 are used to communicate with the connecting plate 16 and the partition 17. The medium inlet pipe 31 is used to connect to the medium storage device outside the accommodating space 101. The cooling medium can enter the connecting plate 16 and the partition 17 through the medium inlet pipe 31. The medium outlet pipe 32 is used to directly communicate with the outside of the accommodating space 101, or to communicate with another medium storage device or a medium processing device. The cooling medium in the connecting plate 16 and the partition 17 can be discharged through the medium outlet pipe 32.

[0072] In one example, as shown in the attached Figure 7As shown, the first pipe assembly 30 also includes a plurality of first medium branch pipes 33 , the medium inlet pipe 31 and the partition 17 are connected via the first medium branch pipes 33 , and the cooling medium in the medium storage device can enter the partition 17 via the medium inlet pipe 31 and the first medium branch pipes 33 .

[0073] In one example, as shown in the attached Figure 7 As shown, the first pipe assembly 30 further includes a plurality of connecting pipes 34 , through which the connecting plate 16 is connected to the medium outlet pipe 32 , and the cooling medium in the connecting plate 16 can be discharged through the connecting pipes 34 and the medium outlet pipe 32 .

[0074] As attached Figure 8 As shown, the second pipe assembly 40 includes a second medium branch pipe 41 and a third medium branch pipe 42. The second medium branch pipe 41 is connected to the partition 17, and the second medium branch pipe 41 is connected to the connecting plate 16 through the third medium branch pipe 42. The cooling medium in the partition 17 can flow out through the second medium branch pipe 41 and flow into the connecting plate 16 through the third medium branch pipe 42. The cooling medium in the connecting plate 16 can flow out from the medium outlet pipe 32.

[0075] In one example, as shown in the attached Figure 7 As shown, the first pipe assembly 30 is located at the front side of the accommodation space 101. More specifically, the first pipe assembly 30 is located at a side of the accommodation space 101 close to the first side plate 12. The medium inlet pipe 31 and the medium outlet pipe 32 pass through the first side plate 12 and communicate with the outside of the accommodation space 101. Figure 8 As shown, the second pipe assembly 40 is located at the rear side of the accommodating space 101, more specifically, the second pipe assembly 40 is located on the side of the accommodating space 101 close to the second side plate 13. In this example, the internal medium flow channels of the connecting plate 16 and the partition 17 extend in the front-to-back direction. The cooling medium enters the interior of the partition 17 from the front end, and flows out from the rear end of the partition 17 to the second medium branch pipe 41, enters the connecting plate 16 from the rear end through the third medium branch pipe 42, and flows out through the medium outlet pipe 32, thereby forming a complete cooling medium circulation loop with a simple and reasonable layout, low installation cost, good heat exchange efficiency, and guaranteed cooling consistency.

[0076] The connecting plate 16 and the separator 17 are connected in series, and the connecting plates 16 and the separators 17 are connected in parallel. A single-in-single-out, top-in-bottom-out cooling medium circulation method is adopted, which can ensure the uniformity of the cooling medium flow, improve the cooling quality, and ensure the temperature consistency of the battery module 20.

[0077] Exemplarily, the number of first medium branch pipes 33 is the same as the number of partitions 17, the number of second medium branch pipes 41 is the same as the number of partitions 17, the cooling medium from the medium inlet pipe 31 can be evenly distributed to each partition 17 through the first medium branch pipe 33, and the flow direction of the coolant in different partitions 17 is consistent, and the internal medium flow channels of each partition 17 are independent of each other, and a number of non-interfering cooling systems can be formed to cool and exchange heat on the left and right sides of the battery module 20. Preferably, the partition 17 contacts the larger side of the battery module 20 to achieve large-area heat exchange.

[0078] Exemplarily, the number of connecting tubes 34 is the same as the number of connecting plates 16, the number of third medium branch pipes 42 is the same as the number of connecting plates 16, the cooling medium flowing out of the partition 17 can be evenly distributed to each connecting plate 16, and flow out from the connecting tube 34 and the medium outlet pipe 32, and the internal medium flow channels of at least two connecting plates 16 are independent of each other, and a non-interfering cooling system can be formed to ensure consistency in the overall heat dissipation and cooling of the battery module 20.

[0079] For example, as shown in the attached Figure 5 As shown, the partition 17 is provided with a first connecting pipe 171 connected to the first medium branch pipe 33 and a second connecting pipe 172 connected to the second medium branch pipe 41 .

[0080] Exemplarily, the separators 17 are symmetrically distributed on the left and right sides of the battery module 20, and a plurality of separators 17 share a set of molding molds, which greatly reduces the mold opening cost, shortens the processing cycle, makes the processing simple and convenient, and increases the production efficiency.

[0081] Exemplarily, a third connecting pipe communicating with the third medium branch pipe 42 and a fourth connecting pipe communicating with the connecting pipe 34 are provided on the connecting plate 16 .

[0082] Exemplarily, the cooling medium mentioned above is cooling liquid.

[0083] For example, the first pipe assembly 30 may be a plain pipe or a corrugated pipe made of PP (Polypropylene), with an integrally formed pipe and a standard joint, which is convenient and fast to connect and has high reliability.

[0084] Exemplarily, the second pipe assembly 40 may be a plain pipe or a corrugated pipe made of PP (Polypropylene), with an integrally formed pipe and a standard joint, which is convenient and fast to connect and has high reliability.

[0085] In one example, the installation steps of the liquid-cooled battery box proposed by the present invention are as follows:

[0086] According to the capacity requirement of the battery module 20, a suitable number of connecting plates 16 are selected, spliced ​​and positioned in the left and right directions, and connected and fixed by stir friction welding to form a bottom plate; secondly, the first side plate 12 and the second side plate 13 are connected and fixed to the connecting plate 16 by stir friction welding; then, the third side plate 14 and the fourth side plate 15 are connected and fixed to the first side plate 12, the second side plate 13 and the connecting plate 16 by stir friction welding, and the connection between the bottom plate and the enclosure is completed; arc welding is performed on the four end corners where the bottom plate and the enclosure are connected to increase the structural strength and the sealing of the connection; finally, the first pipe assembly 30 and the second pipe assembly 40 are installed in the accommodating space 101, so that the connecting plate 16 is connected to the third medium branch pipe 42 and the connecting pipe 34. After the battery module 20 is placed in the accommodating space 101, the cover 11 is connected to the enclosure to complete the assembly of the main body 10.

[0087] When the battery module 20 is installed in the accommodation space 101 , the battery module 20 can be placed in the main body 10 by hoisting, the partition 17 is connected to the first medium branch pipe 33 and the second medium branch pipe 41 , and is encapsulated in the accommodation space 101 by the cover 11 .

[0088] Based on the above-mentioned liquid-cooled battery box, the present invention further proposes a battery pack assembly, including a plurality of battery modules 20 , and the battery modules 20 are installed in the accommodating space 101 of the above-mentioned main body 10 .

[0089] The beneficial effects of the liquid-cooled battery box proposed by the utility model are:

[0090] At least two connecting plates 16 can support the battery module 20, so as to cooperate with the enclosure and the cover 11 to install the battery module 20. The connecting plates 16 are used to circulate the cooling medium, and can perform heat exchange cooling on the bottom of the battery module 20;

[0091] A separator 17 is provided in the accommodation space 101 of the main body 10. The separator 17 is located on the left and right sides of the battery module 20 and can separate and fix the battery module 20. The separator 17 is used to circulate the cooling medium. The separator 17 can perform heat exchange cooling on the left and right sides of the battery module 20. The separator 17 has good functional integration, which is conducive to reducing the overall weight of the main body 10 and the battery module 20 therein;

[0092] The connecting plate 16 cooperates with the separator 17 to increase the heat exchange area, thereby efficiently cooling the battery module 20 to ensure the service life of the battery module 20;

[0093] The separator 17 is connected to the connecting plate 16, and the cooling medium can flow between the separator 17 and the connecting plate 16, thereby improving the stability and consistency of heat exchange of the battery module 20 and achieving high heat exchange efficiency.

[0094] The beneficial effects of the battery pack assembly proposed by the utility model are: light overall weight and good cooling consistency, which is beneficial to improving the service life of the battery pack assembly.

[0095] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid-cooled battery box, characterized in that: The invention comprises a main body (10), wherein the main body (10) comprises a cover (11), a surrounding plate and a bottom plate, wherein the lower end of the surrounding plate is connected to the bottom plate and forms a storage space (101) for installing a battery module (20), the upper end of the surrounding plate is connected to the cover (11), and the cover (11) is used to seal and install the battery module (20) in the storage space (101), the bottom plate comprises at least one connecting plate (16), and the connecting plate (16) is used to circulate a cooling medium, and at least two partitions (17) are arranged in the storage space (101), and the partitions (17) are in contact with and connected to the left and right sides of the battery module (20), and the partitions (17) are used to circulate a cooling medium, and the partitions (17) are connected to the connecting plate (16).

2. The liquid-cooled battery box according to claim 1, characterized in that: When the number of the connecting plates (16) is two or more, the connecting plates (16) are connected along the left-right direction.

3. The liquid-cooled battery box according to claim 1 or 2, characterized in that: A first pipe assembly (30) and a second pipe assembly (40) are provided in the accommodating space (101); the first pipe assembly (30) and the second pipe assembly (40) are used to connect the connecting plate (16) and the partition (17); the first pipe assembly (30) comprises a medium inlet pipe (31) and a medium outlet pipe (32); the medium inlet pipe (31) is used to connect with a medium storage device outside the accommodating space (101); the medium outlet pipe (32) is used to connect with the outside of the accommodating space (101); the cooling medium can enter the connecting plate (16) and the partition (17) through the medium inlet pipe (31) and be discharged through the medium outlet pipe (32).

4. The liquid-cooled battery box according to claim 3, characterized in that: The first pipe assembly (30) further comprises a plurality of first medium branch pipes (33), and the medium inlet pipe (31) and the partition (17) are connected via the first medium branch pipes (33).

5. The liquid-cooled battery box according to claim 3, characterized in that: The first pipe assembly (30) further comprises a plurality of connecting pipes (34), and the connecting plate (16) is connected to the medium outlet pipe (32) via the connecting pipes (34).

6. The liquid-cooled battery box according to claim 3, characterized in that: The second pipe assembly (40) comprises a second medium branch pipe (41) and a third medium branch pipe (42); the second medium branch pipe (41) is connected to the partition (17); and the second medium branch pipe (41) is connected to the connecting plate (16) via the third medium branch pipe (42).

7. The liquid-cooled battery box according to claim 3, characterized in that: The first pipe assembly (30) is located at the front side of the accommodating space (101), and the second pipe assembly (40) is located at the rear side of the accommodating space (101). The cooling medium enters the partition (17) through the medium inlet pipe (31), enters the connecting plate (16) through the second pipe assembly (40), and is discharged through the medium outlet pipe (32).

8. The liquid-cooled battery box according to claim 1, characterized in that: The enclosure comprises a first side plate (12) and a second side plate (13) arranged opposite to each other in the front-rear direction, and a third side plate (14) and a fourth side plate (15) arranged opposite to each other in the left-right direction.

9. The liquid-cooled battery box according to claim 8, characterized in that: The third side plate (14) and the fourth side plate (15) both comprise a plate body (151) and a reinforcement member, wherein the reinforcement member comprises a first support beam (152) and a second support beam (153), wherein the first support beam (152) and the second support beam (153) are located on a side of the plate body (151) away from the accommodating space (101), and are spaced apart in an up-down direction.

10. A battery pack assembly, characterized in that: It comprises a plurality of battery modules (20) and a liquid-cooled battery box according to any one of claims 1 to 9, wherein the battery modules (20) are installed in a receiving space (101) of the main body (10).

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