A battery pack box and a battery pack having the same

Abstract

The present invention discloses a battery pack box and a battery pack having the box. The technical solution thereof includes a lower box, an upper cover arranged at the upper end of the lower box, mounting parts arranged at the periphery of the lower box, and a battery accommodating cavity arranged between the lower box and the upper cover. The lower box includes a frame and a spliced ​​bottom plate arranged in the frame. The frame includes a first main beam and a second main beam arranged vertically. The first main beam is provided with a first connecting part matching the spliced ​​bottom plate on the inner side. The second main beam is provided with a second connecting part matching the spliced ​​bottom plate on the inner side. The present invention has many advantages such as good weldability, high structural strength, and easy expansion. It improves the energy density of the system while ensuring the safety of the battery system, and meets the lightweight requirements of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of battery module processing, and more specifically, to an aluminum alloy welded battery pack case and a battery pack having the case. Background Art

[0002] At present, there are three main types of battery pack cases: sheet metal cases, aluminum alloy die-cast cases, and extruded profile welded cases. Sheet metal cases have low cost, high strength, and good mechanical properties, but they are heavy, which limits their large-scale promotion and application.

[0003] Aluminum alloy die-casting boxes have good structural strength and good sealing performance, but due to the limitations of the die-casting process and the large area of ​​the battery pack chassis, the box thickness is generally required to be greater than 4mm, which results in a large margin in strength design, resulting in an unobvious lightweight effect. The profile cavity of the aluminum profile welding solution adopts an extrusion process, which can achieve a thin-walled structure with a wall thickness of less than 1.5mm, which has great advantages in structural lightweighting, but has defects such as insufficient welding strength, poor sealing performance, and low reliability, which limits its further promotion and application. Summary of the invention

[0004] To solve the above problems, one of the purposes of the present invention is to provide a battery pack box having many advantages such as good weldability, high structural strength, and easy expansion;

[0005] The second object of the present invention is to provide a battery pack having the box body, which improves the energy density of the system while ensuring the safety of the battery system and meets the lightweight requirements of the system.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a battery pack box, comprising a lower box, an upper cover arranged at the upper end of the lower box, mounting portions respectively arranged at the periphery of the lower box, and a battery accommodating cavity arranged between the lower box and the upper cover, the lower box comprising a frame and a spliced ​​bottom plate arranged in the frame, the frame comprising a first main beam and a second main beam arranged vertically; a first connecting portion matching the spliced ​​bottom plate is provided on the inner side of the first main beam; a second connecting portion matching the spliced ​​bottom plate is provided on the inner side of the second main beam.

[0007] Preferably, the first connecting portion includes an inner beam and a first boss arranged on the top of the inner beam, and a groove is provided at the end of the spliced ​​base plate that cooperates with any first boss.

[0008] Preferably, the second connection portion includes a module fixing beam and a lap beam arranged at the lower end of the module fixing beam, and a lap groove is provided on the side of the spliced ​​bottom plate that cooperates with any lap beam.

[0009] By adopting the above technical solution, the flexibility of each connection part on the box body is improved and the stability of the box body is ensured.

[0010] Preferably, the spliced ​​base plate includes a plurality of spliced ​​plates arranged in an array, longitudinal reinforcing beams arranged between any two rows of spliced ​​plates and transverse reinforcing beams perpendicular to the longitudinal reinforcing beams, the longitudinal reinforcing beams include a third main beam, second lap edges arranged on both sides of the lower end of the third main beam and a second boss arranged at the lower end of any second lap edge, and a second lap groove is provided at the side end of the spliced ​​plate cooperating with any second boss.

[0011] Preferably, any of the splicing plates comprises an upper plate, a lower plate and a plurality of reinforcing beams arranged in parallel between the upper plate and the lower plate, any of the reinforcing beams are parallel to the first main beam, the splicing plates comprises a first splicing plate and a second splicing plate arranged between the first splicing plate and any of the first main beams, any of the first splicing plates is provided with a first lap edge on its side, and a first lap groove on the corresponding side, and any of the second splicing plates is provided with third lap grooves on both ends of the side that respectively match the first lap edge and the second boss.

[0012] By adopting the above technical solution, the stability of the base plate is improved, the overlap strength is improved, the use of materials is reduced, and the cost is reduced.

[0013] Preferably, the first main beam includes a side wall, a fixing portion arranged at the upper end of the side wall, an isosceles triangular through groove and an isosceles right-angle through groove arranged in the side wall.

[0014] By adopting the above technical solution, the frame and bottom plate of the box body are both hollow structures, which are manufactured by aluminum alloy extrusion molding process, and have the advantages of high molding efficiency and good structural strength.

[0015] A battery pack comprises a box, battery modules arranged in parallel in the box, and a thermal management component matched with the battery modules, wherein the thermal management component comprises a liquid cooling plate arranged between any row of battery modules, a water inlet and a water outlet respectively arranged at both ends of the liquid cooling plate, and pipelines respectively matched with the water inlet and the water outlet, wherein a transverse groove is provided in the liquid cooling plate, a flow distribution device is provided matched with the water inlet, and any of the pipelines is fixed in the box by a cable tie.

[0016] By adopting the above technical solution, the liquid cooling pipe is fixed to the box body by cable ties. The above fixing method has a simple and reliable structure, ensures the structural safety of the battery system during operation, and avoids the risk of failure of the liquid cooling system during operation of the battery system.

[0017] Preferably, any of the battery modules described herein comprises a battery cell, a wiring harness isolation plate matching the battery cell, a module end plate arranged outside the battery cell, a module side plate and a module bottom plate, the side of the module end plate is provided with a cross beam matching the module fixing beam, and the module fixing beam matching any of the installation process holes is provided with a dislocation piece.

[0018] By adopting the above technical solution, the battery module is fixed to the first reinforcing beam and the frame by overlapping the cross beams. Through this fixing method, effective load transfer is achieved, the force transmission distance is shortened, and the structural strength is improved. An initial misalignment is set between the installation process hole and the box fixing beam. The compression amount of the thermal pad between the module and the cold plate is controlled by the misalignment distance, thereby ensuring reliable installation and fixation of the thermal management system.

[0019] Preferably, a gap is provided between the battery module and the bottom plate, and a buffer foam is provided in the gap.

[0020] By adopting the above technical solution, the system's ability to resist bottom impact damage is further improved, the service life of the battery pack is extended, and the effect of energy saving and environmental protection is achieved.

[0021] Preferably, a thermal pad is provided between the module bottom plate and the liquid cooling plate, and a thermal conductive glue is provided between the module bottom plate and the battery cell.

[0022] By adopting the above technical solution, the module bottom plate and the liquid cooling plate are brought into good contact by compressing the thermal conductive pad, thereby achieving efficient heat dissipation; the heat of the battery pack during operation is easily discharged through the module bottom plate 23 by the thermal conductive glue.

[0023] The present invention has the following advantages:

[0024] 1. Provides an aluminum profile welded battery pack box, which adopts the method of multiple pieces of structure "male and female" splicing and then double-sided welding to fix the connection, with the advantages of high strength, good lightweight effect, high reliability, easy expansion, etc.

[0025] 2. An aluminum profile frame structure is provided, which is composed of multiple parts. The module fixing beam and hanging point are combined on the frame profile. The one-piece molding process is adopted, which is conducive to the efficient transfer of load and improves the structural strength of the battery pack.

[0026] 3. A module installation and fixing method is provided, which adopts end plate overlap and fixing. There is a buffer gap between the bottom of the module and the box body, which improves the battery pack's ability to resist ground damage and improves the safety performance of the system.

[0027] 4. A thermal management system and its layout are provided. Through the relative clamping arrangement of double-row modules, thermal management of double-row modules by a single cold plate is realized, and flow distribution and control can be realized through a flow distribution device. Through the symmetrical arrangement of water-cooled plate joints, it has many advantages such as high efficiency, reliability, high integration efficiency, and easy expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 : An exploded view of the battery pack of the present invention;

[0029] Figure 2 : is a schematic diagram of the lower box of the present invention;

[0030] Figure 3 : is an enlarged structural schematic diagram of the framework of the present invention;

[0031] Figure 4 : is a schematic cross-sectional view of a rear beam of the present invention;

[0032] Figure 5 : is a schematic diagram of the bottom plate structure of the present invention;

[0033] Figure 6 : It is a schematic diagram of the structure of the spliced ​​plate of the present invention;

[0034] Figure 7 : is a schematic diagram of the first reinforcing beam structure of the present invention;

[0035] Figure 8 : is a schematic diagram of the splicing of the first reinforcing beam and the splicing plate of the present invention;

[0036] Fig. 9 : is a schematic cross-sectional view of the lower box body of the present invention;

[0037] Fig.10 : It is a schematic diagram of the overlapping and fixing of the frame and the bottom plate of the present invention;

[0038] Fig.11 : It is a schematic diagram of the overlapping and fixing of the overlapping plates of the present invention;

[0039] Fig.12 : It is a schematic diagram of the battery module structure of the present invention;

[0040] Fig.13 : is a schematic diagram of the internal structure of the battery module of the present invention;

[0041] Fig.14 : is a schematic diagram of the end plate of the battery module of the present invention;

[0042] Fig.15 : A schematic diagram of the battery module installation-bottom gap of the present invention;

[0043] Fig.16: It is a schematic diagram of the installation of the battery module and the frame of the present invention;

[0044] Fig.17 : It is a schematic diagram of the installation and fixation of the battery module and the reinforcing beam of the present invention;

[0045] Fig.18 : is a schematic diagram of a fixing method of a liquid cooling plate of the present invention;

[0046] Fig.19 : is a schematic diagram of the structure of the thermal management component of the present invention;

[0047] Fig. 20 : is a schematic diagram of the structure of the heat conduction path of the present invention;

[0048] Fig.21 : It is a schematic diagram of the structure of the liquid cooling plate of the present invention;

[0049] Fig. 22 : is a schematic diagram of the internal structure of the lower cold plate of the present invention;

[0050] Fig.23 : is a schematic diagram of the structure of the flow distribution device of the present invention;

[0051] Fig.24 : is a schematic diagram of the parallel connection mode of the liquid cooling plate of the present invention;

[0052] Fig.25 : is a schematic diagram of the connection method of fixing the pipeline with a cable tie of the present invention;

[0053] Fig.26 : It is a schematic diagram of the connection method between the cross beam and the module fixing beam of the present invention;

[0054] In the figure: 1, lower box; 2, battery module; 3, thermal management component; 4, upper cover; 5, gap; 11, frame; 12, bottom plate; 21, module end plate; 22, module side plate; 23, module bottom plate; 24, harness isolation plate; 25, battery cell; 26, thermal conductive glue; 31, liquid cooling plate; 32, pipeline; 33, thermal pad; 34, cable tie; 313, water inlet; 314, water outlet; 3121, transverse groove; 3122, flow distribution device; 1122, The first main beam; 1121, inner beam; 1123, hanging ear; 1132, second main beam; 1131, hanging point; 1133, module fixing beam; 11221, side wall; 11222, isosceles triangle groove; 11223, fixing part; 11224, isosceles right angle groove; 11211, first boss; 11213, groove; 1134, lap beam; 121, second splicing plate; 122, longitudinal reinforcement beam; 123, transverse reinforcement beam; 124, first splicing plate; 1214, first overlapping edge; 1215, first overlapping groove; 1221, third main beam; 1222, second tower edge; 1223, second boss; 1216, second overlapping groove; 1211, upper plate; 1212, lower plate; 1213, reinforcing beam; 211, cross beam; 2111, module fixing hole; 2112, installation process hole; 2113, offset part; 11212, hollow structure; 311, upper cold plate; 312, lower cold plate. DETAILED DESCRIPTION

[0055] Reference Figures 1 to 25 As shown, a battery pack case of the present embodiment includes a lower case 1, an upper cover 4 arranged at the upper end of the lower case 1, mounting portions respectively arranged at the periphery of the lower case 1 and a battery accommodating cavity arranged between the lower case 1 and the upper cover 4, the lower case 1 includes a frame 11 and a spliced ​​bottom plate 12 arranged in the frame 11, the frame 11 includes a first main beam 1122 and a second main beam 1132 arranged vertically; a first connecting portion matching the spliced ​​bottom plate 12 is provided on the inner side of the first main beam 1122; a second connecting portion matching the spliced ​​bottom plate 12 is provided on the inner side of the second main beam 1132, and the mounting portion includes a hanging ear 1123 and a hanging point 1131.

[0056] The box body is composed of an upper cover 4 and a lower box body 1. The lower box body 1 is composed of a frame 11 and a bottom plate 12. A battery accommodating cavity is formed between the upper end of the bottom plate 12 and the upper cover 4 for placing and installing the battery module 2. The frame 11 is composed of two first main beams 1122 symmetrically arranged with the central axis of the bottom plate 12 and two second main beams 1132 symmetrically arranged with the central axis of the bottom plate 12. The first main beam 1122 and the second main beam 1132 are vertically spliced ​​into one body and fixed by welding, and the welding method here is MIG welding. The lug 1123 located on the outside of the first main beam 1122 is used for the installation and fixation of the entire battery pack box body and the body structure.

[0057] The first connecting part includes an inner supporting beam 1121 and a first boss 11211 arranged at the top end of the inner supporting beam 1121. A groove 11213 is provided at the end of the splicing bottom plate 12 that mates with any one of the first bosses 11211.

[0058] The second connecting part includes a module fixing beam 1133 and a connecting supporting beam 1134 arranged at the lower end of the module fixing beam 1133. A connecting supporting groove that mates with the connecting supporting beam is provided at the side of the bottom plate 12.

[0059] The main body of the inner supporting beam 1121 is a flat plate structure, and the flat plate structure includes a hollow structure 11212. The structure of the first boss 11211 mates with the groove 11213 in the end structure of the bottom plate 12 to form a 'male-female' lap joint. Generally, to ensure the mating strength, the mating width is set to 5 - 10 mm.

[0060] The splicing bottom plate 12 includes a plurality of splicing plates arranged in an array, a longitudinal strengthening beam 122 arranged between any two rows of splicing plates, and a transverse strengthening beam 123 perpendicular to the longitudinal strengthening beam 122. The longitudinal strengthening beam 122 includes a third main beam 1221, second connecting edges 1222 arranged on both sides of the lower end of the third main beam 1221, and a second boss 1223 arranged at the lower end of any one of the second connecting edges 1222. A second connecting supporting groove 1216 is provided at the side end of the splicing bottom plate 12 that mates with any one of the second bosses 1223.

[0061] The splicing bottom plate 12 is formed by splicing and welding a plurality of splicing plates, longitudinal strengthening beams 122, and transverse strengthening beams 123. The welding method is friction stir welding.

[0062] The longitudinal strengthening beam 122 is composed of a third main beam 1221, second connecting edges 1222, and a second boss 1223. The third main beam 1221 is a 'Lv'-shaped hollow structure, and its structure is as Figure 8 shown, and fixing threaded holes are provided on the upper surface for the installation and fixation of the battery module 2.

[0063] The arrangement of the transverse strengthening beam 123 can be set in two ways. One way is that the transverse strengthening beam 123 is vertically crossed with the longitudinal strengthening beam 122 and arranged on the lower end surface of the splicing plate. Another way is that the structure of the transverse strengthening beam 123 can be set to be similar to the structure of the longitudinal strengthening beam 122, which is a 'T'-shaped structure. In this way, the transverse strengthening beam 123 is still vertically crossed with the longitudinal strengthening beam 122, and the connection method between the splicing plate and the transverse strengthening beam 123 is also a lap joint connection and fixation.

[0064] Threaded holes are provided on the upper surfaces of both the longitudinal strengthening beam 122 and the transverse strengthening beam 123. The threaded holes are used for the installation and fixation of the battery module 2.

[0065] Any of the splicing plates includes an upper plate 1211, a lower plate 1212 and a plurality of reinforcing beams 1213 arranged in parallel between the upper plate 1211 and the lower plate 1212, any of the reinforcing beams 1213 are parallel to the first main beam 1122, the splicing plates include a first splicing plate 124 and a second splicing plate 121 arranged between the first splicing plate 124 and any of the first main beams 1122, any of the first splicing plates 124 is provided with a first lap edge 1214 on the side, and a first lap groove 1215 on the corresponding side, and any of the second splicing plates 121 is provided with third lap grooves on both ends of the side that respectively match the first lap edge 1214 and the second boss 1223.

[0066] A plurality of reinforcing beams 1213 are arranged in parallel, so as to form a hollow reinforcing plate structure with the upper plate 1211 and the lower plate 1212. The splicing plate is arranged into a plurality of first splicing plates 124 and second splicing plates 121 connected in parallel. The reinforcing beam 1213 on one side of the first splicing plate 124 corresponding to the end of the frame 11 is at a certain distance from the left edge of the upper plate 1211 and the lower plate 1212, so that the first lap groove 1215 of the second splicing plate 121 can be formed, which is the female end of the 'male-female' splicing. The first lap edge 1214 is arranged On the other side, half is arranged between the upper plate 1211 and the lower plate 1212, and the other half is protruding to form a male end of a 'male-female' overlap, which can be overlapped with the first overlap groove 1215 of the next first splicing plate 124, and the third overlap groove on one side of the second splicing plate 121 can be overlapped with the first overlap edge 1214 of the outermost first splicing plate, and the third overlap groove on the other side can be overlapped and connected with the second boss 1223. To ensure the overlap strength, the width of the overlap edge is set to 5~10mm.

[0067] One side of the reinforcing beam 1213 corresponding to the side of the frame 11 is at a certain distance from the edges of the upper plate 1211 and the lower plate 1212, forming a groove that cooperates with the lap beam 1134 of the frame 11. Inserting the lap beam 1134 can form a "male and female" lap joint, thereby realizing the lap fixation of the bottom plate 12 and the frame 11; the other side is also at a certain distance from the edges of the upper plate 1211 and the lower plate 1212, forming a second lap groove 1216 that cooperates with the second boss 1223. Inserting the second boss 1223 into the second lap groove 1216 can form a "male and female" lap joint, thereby realizing the lap fixation of the longitudinal reinforcing beam 122 and the second splicing plate 121.

[0068] The first main beam 1122 includes a side wall 11221 , a fixing portion 11223 disposed at the upper end of the side wall 11221 , an isosceles triangular through groove 11222 and an isosceles right-angle through groove 11224 disposed in the side wall 11221 .

[0069] The isosceles triangle groove 11222 and the isosceles right angle groove 11224 are hollow structures, and are manufactured by aluminum alloy extrusion molding process, and have the advantages of high molding efficiency and good structural strength. In order to ensure the structural strength, generally, the wall thickness of the side wall 11221 is set to 3-5 mm.

[0070] The cross-section of the isosceles triangular through groove 11222 is an isosceles triangular structure. Generally, the wall thickness of the isosceles triangular through groove 11222 is set to 1-3 mm, and its obtuse angle is set to 100-150°; the cross-section of the isosceles right-angled through groove 11224 is an isosceles right-angled triangular structure; the fixing part 11223 is composed of a plane and an inner boss structure, which is used for the installation and fixation of the sealing ring and the upper cover 4, and the circumferential positioning of the sealing ring is realized through the boss structure.

[0071] A battery pack comprises a box, battery modules 2 arranged in parallel in the box, and a thermal management component 3 cooperating with the battery modules 2, wherein the thermal management component 3 comprises a liquid cooling plate 31 arranged between any row of battery modules, a water inlet 313 and a water outlet 314 respectively arranged at both ends of the liquid cooling plate 31, and a pipeline 32 respectively arranged at the water inlet 313 and the water outlet 314, wherein a transverse groove 3121 is provided in the liquid cooling plate 31, and a flow distribution device 3122 is provided cooperating with the water inlet 313, and any of the pipelines 32 is fixed in the box by a cable tie 34.

[0072] Any of the battery modules 2 includes a battery cell 25, a wiring harness isolation plate 24 that cooperates with the battery cell 25, a module end plate 21 arranged outside the battery cell 25, a module side plate 22 and a module bottom plate 23, the side of the module end plate 21 is provided with a cross beam 211 that cooperates with the module fixing beam 1133, and the cross beam 211 is penetrated by a module fixing hole 2111 and an installation process hole 2112, and the module fixing beam 1133 that cooperates with any of the installation process holes 2112 is provided with a dislocation piece 2113.

[0073] A gap 5 is provided between the battery module 2 and the bottom plate 12 , and a buffer foam is provided in the gap 5 .

[0074] A thermal pad 33 is provided between the module bottom plate 23 and the liquid cooling plate 31 , and a thermal conductive adhesive 26 is provided between the module bottom plate 23 and the battery cell 25 .

[0075] A battery pack, which is composed of a lower case 1, a battery module 2, a thermal management component 3 and an upper cover 4. The upper cover 4 is fixed to the lower case 1 by bolts and forms a battery receiving cavity with the lower case 1. The battery modules 2 are arranged and fixed in sequence in the battery receiving cavity formed by the lower case 1 and the upper cover 4, and the thermal management component 3 is fixed above the rear battery module 2 through a mounting plate. The battery module 2 is composed of a stack of module end plates 21, module side plates 22, module bottom plates 23, wiring harness isolation plates 24 and internal battery cells 25. The module end plates 21 and module side plates 22 are fixed by welding to form the basic force-bearing frame of the battery module 2.

[0076] The space between the module bottom plate 23 and the battery core 25 is filled with heat-conducting glue 26 . This arrangement facilitates heat generated by the battery pack during operation to be easily discharged through the module bottom plate 23 .

[0077] The module end plate 21 is a T-shaped structure, and the crossbeam 211 is used for installing and fixing the battery module 2 .

[0078] The battery module 2 is fixed to the longitudinal reinforcement beam 122, the transverse reinforcement beam 123 and the second main beam 1132 by overlapping the cross beam 211. Through this fixing method, effective load transfer is achieved, the force transmission distance is shortened, and the structural strength is improved. The module crossbeam 211 is provided with two pairs of module fixing holes 2111 and installation process holes 2112, which are respectively arranged at the left and right ends of the module crossbeam 211. The module fixing beam 1133 is provided with a through groove matching the module fixing hole 2111. The module crossbeam 211 is fixed to the upper end of the module fixing beam 1133 by passing bolts through the module fixing hole 2111 and the through groove. A dislocation piece 2113 is provided between the installation process hole 2112 and the module fixing beam 1133 of the box body. The installation process hole 2112 is matched with the dislocation piece 2113. The compression amount of the thermal pad 33 between the module bottom plate 23 and the liquid cooling plate 31 is controlled by the dislocation distance, thereby ensuring the reliable installation and fixation of the thermal management component 3 system.

[0079] After the battery module 2 is installed in the lower box 1, there is a gap 5 between the lower bottom surface of the battery module 2 and the upper surface of the bottom plate 12. The thickness of the gap 5 is 5 to 8 mm. Through the setting of this gap 5, the distance between the battery module 2 and the bottom plate 12 is increased, thereby realizing the battery pack's ability to resist bottom impact damage.

[0080] The liquid cooling plate 31 is placed in the middle of any two rows of battery modules 2 and is fixed by mutually clamping the two rows of battery modules 2. The two rows of battery modules 2 are arranged relatively to each other, and the bottom plate of the battery module 2 is in contact with the upper and lower surfaces of the liquid cooling plate 31. This arrangement realizes the thermal management of the double-row battery modules 2 by a single liquid cooling plate 31, and has the advantages of high efficiency, reliability, high integration efficiency, and good scalability.

[0081] The liquid cooling plate 31 is clamped and fixed by a double-row module, which has the following advantages:

[0082] 1. The liquid cooling plate is connected as a whole through the clamping force between the thermal pad and the module. When the power battery system is in operation and is subjected to external loads such as vibration and impact, the liquid cooling system will move together with the module, ensuring that the liquid cooling system is always in good contact with the module, thus improving the reliability of the thermal management system;

[0083] 2. Liquid cooling is arranged between the two rows of modules, realizing the cooling of double-row modules by a single cold plate, which has the advantage of high integration efficiency;

[0084] 3. The liquid cooling plate is clamped and fixed by two rows of modules on the left and right. The water inlet and outlet of the liquid cooling plate are arranged perpendicular to the liquid cooling plate. This coaxial arrangement of the water inlet and outlet saves design space and improves the energy density of the system.

[0085] 4. A flow control device is installed inside the liquid cooling plate, which realizes flow control between different liquid cooling plates through the size of the opening, ensuring the uniform temperature between different modules.

[0086] A thermal pad is provided between the module bottom plate 23 and the liquid cooling plate. The liquid cooling plate 31 is composed of an upper cooling plate 311 , a lower cooling plate 312 , a water inlet 313 and a water outlet 314 .

[0087] The water inlet 313 and the water outlet 314 are respectively arranged at both ends of the liquid cooling plate 31, and the outlet directions of the water inlet / outlet are arranged along the normal direction of the liquid cooling plate 31. This arrangement effectively improves the space utilization of the liquid cooling system.

[0088] The transverse groove 3121 is disposed in the lower cold plate. After the upper cold plate 311 and the lower cold plate 312 are butt-jointed and sealed, a liquid flow channel is formed in the transverse groove 3121 .

[0089] The water inlet 313 and the water outlet 314 are respectively arranged on both sides of the lower cold plate, and the flow distribution device 3122 is arranged in the water inlet 313. The flow of the liquid cooling plate is controlled by controlling the size of the opening 31221 to ensure the flow uniformity of multiple parallel liquid cooling plates.

[0090] At the same time, the present invention provides a compact liquid cooling plate parallel connection method, such as Fig.24 As shown, by symmetrically arranging the joints of the water inlet 313 or the water outlet 314 along the liquid cooling plate, the space requirement of the thermal management system is saved and the integration of the system is improved.

[0091] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A battery pack box, comprising a lower box (1), an upper cover (4) arranged at the upper end of the lower box (1), mounting portions respectively arranged at the periphery of the lower box (1), and a battery accommodating cavity arranged between the lower box (1) and the upper cover (4), characterized in that: The lower box body (1) comprises a frame (11) and a spliced ​​bottom plate (12) arranged in the frame (11); the frame (11) comprises a first main beam (1122) and a second main beam (1132) arranged vertically; a first connecting portion matching the spliced ​​bottom plate (12) is arranged on the inner side of the first main beam (1122); and a second connecting portion matching the spliced ​​bottom plate (12) is arranged on the inner side of the second main beam (1132); The first connection portion comprises an inner beam (1121) and a first boss (11211) arranged at the top end of the inner beam (1121), and a groove (11213) is provided at the end of the spliced ​​bottom plate (12) that cooperates with any first boss (11211); the second connection portion comprises a module fixing beam (1133) and a lap beam (1134) arranged at the lower end of the module fixing beam (1133), and a lap groove is provided at the side of the spliced ​​bottom plate (12) that cooperates with any lap beam (1134); The spliced ​​bottom plate (12) comprises a plurality of spliced ​​plates arranged in an array, a longitudinal reinforcing beam (122) arranged between any two rows of spliced ​​plates, and a transverse reinforcing beam (123) perpendicular to the longitudinal reinforcing beam (122), the longitudinal reinforcing beam (122) comprising a third main beam (1221), second lap edges (1222) arranged on both sides of the lower end of the third main beam (1221), and a second boss (1223) arranged at the lower end of any second lap edge (1222), and a second lap groove (1216) is provided at the side end of the spliced ​​plate that matches any second boss (1223); any of the spliced ​​plates comprises an upper plate (1211), a lower plate (1212), and a transverse reinforcing beam (123) arranged in parallel at the bottom end. A plurality of reinforcing beams (1213) are provided between an upper plate (1211) and a lower plate (1212), any of the reinforcing beams (1213) being parallel to the first main beam (1122), the splicing plate comprising a first splicing plate (124) and a second splicing plate (121) arranged between the first splicing plate (124) and any of the first main beams (1122), any of the first splicing plates (124) being provided with a first lap edge (1214) on the side, and a first lap groove (1215) on the corresponding side, and third lap grooves respectively matching the first lap edge (1214) and the second boss (1223) on the side at both ends of any of the second splicing plates (121).

2. A battery pack box according to claim 1, characterized in that: The first main beam (1122) comprises a side wall (11221), a fixing portion (11223) arranged at the upper end of the side wall (11221), an isosceles triangular through groove (11222) and an isosceles right-angle through groove (11224) arranged in the side wall (11221).

3. A battery pack, characterized in that: The invention comprises the battery pack case according to any one of claims 1 to 2, battery modules (2) arranged in parallel in the case, and a thermal management component (3) matched with the battery modules (2), wherein the thermal management component (3) comprises a liquid cooling plate (31) arranged between any row of battery modules (2), a water inlet (313) and a water outlet (314) respectively arranged at two ends of the liquid cooling plate (31), and a pipeline (32) respectively matched with the water inlet (313) and the water outlet (314), wherein a transverse groove (3121) is provided in the liquid cooling plate (31), and a flow distribution device (3122) is provided matched with the water inlet (313), and any of the pipelines (32) is fixed in the battery pack case by a cable tie (34).

4. A battery pack according to claim 3, characterized in that: Any of the battery modules (2) comprises a battery cell (25), a wiring harness isolation plate (24) matched with the battery cell (25), a module end plate (21) arranged outside the battery cell (25), a module side plate (22) and a module bottom plate (23), the side of the module end plate (21) is provided with a crossbeam (211) matched with the module fixing beam (1133), the crossbeam (211) is penetrated by a module fixing hole (2111) and an installation process hole (2112), and the module fixing beam (1133) matched with any of the installation process holes (2112) is provided with a dislocation piece (2113).

5. A battery pack according to claim 3, characterized in that: A gap (5) is provided between the battery module (2) and the bottom plate (12), and a buffer foam is provided in the gap (5).

6. A battery pack according to claim 4, characterized in that: A thermal conductive pad (33) is provided between the module bottom plate (23) and the liquid cooling plate (31), and a thermal conductive adhesive (26) is provided between the module bottom plate (23) and the battery core (25).

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