CN212725481U

CN212725481U - Battery pack box and battery pack with same

Info

Publication number: CN212725481U
Application number: CN202020440934.8U
Authority: CN
Inventors: 刘勇; 叶斌; 占伟涛; 朱帮守; 陈敏; 孙世强; 王松义
Original assignee: Hangzhou Generalpower Technology Co ltd
Current assignee: Hangzhou Generalpower Technology Co ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2021-03-16
Anticipated expiration: 2030-03-31

Abstract

The invention discloses a battery pack box body and a battery pack with the same, and the technical scheme is characterized by comprising a lower box body, an upper cover arranged at the upper end of the lower box body, installation parts respectively arranged at the periphery of the lower box body and a battery accommodating cavity arranged between the lower box body and the upper cover, wherein the lower box body comprises a frame and a spliced bottom plate arranged in the frame, and the frame comprises a first main beam and a second main beam which are vertically arranged; a first connecting part matched with the splicing type bottom plate is arranged on the inner side of the first main beam; and a second connecting part matched with the splicing type bottom plate is arranged on the inner side of the second main beam. The invention has the advantages of good weldability, high structural strength, easy expansion and the like, improves the energy density of the system while ensuring the safety of the battery system, and meets the requirement of light weight of the system.

Description

Battery pack box and battery pack with same

Technical Field

The invention relates to the technical field of battery module processing, in particular to an aluminum alloy tailor-welded battery pack box body and a battery pack with the same.

Background

At present, the battery pack box body mainly has three forms: the box body is welded with the metal plate box body, the aluminum alloy die-casting box body and the extruded section. The sheet metal box body has the advantages of low cost, high strength and good mechanical property, but has high weight, so that the large-scale popularization and application of the sheet metal box body are limited.

The aluminum alloy die-casting box body has good structural strength and good sealing performance, but the box body is generally required to be thicker than 4mm due to the limitation of a die-casting process and the reason that the area of a battery pack chassis is too large, and a large margin appears in strength design, so that the light-weight effect is not obvious. The section bar cavity of the aluminum section bar splicing and welding scheme adopts an extrusion process, can realize a thin-wall structure with the wall thickness smaller than 1.5mm, has great advantages in structural lightweight, but has the defects of insufficient welding strength, poor sealing performance, low reliability and the like, and limits further popularization and application.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a battery pack case having many advantages such as good weldability, high structural strength, and easy expansion;

the second purpose of the invention is to provide a battery pack with the box body, which can ensure the safety of a battery system, improve the energy density of the system and meet the requirement of light weight of the system.

In order to achieve the purpose, the invention provides the following technical scheme: a battery pack box body comprises a lower box body, an upper cover arranged at the upper end of the lower box body, mounting parts respectively arranged on the periphery of the lower box body, and a battery accommodating cavity arranged between the lower box body and the upper cover, wherein the lower box body comprises a frame and a spliced bottom plate arranged in the frame, and the frame comprises a first main beam and a second main beam which are vertically arranged; a first connecting part matched with the splicing type bottom plate is arranged on the inner side of the first main beam; and a second connecting part matched with the splicing type bottom plate is arranged on the inner side of the second main beam.

Preferably, the first connecting portion comprises an inner overlapping beam and a first boss arranged at the top end of the inner overlapping beam, and a groove is formed in the end portion of the spliced bottom plate matched with any one first boss.

Preferably, the second connecting portion comprises a module fixing beam and an overlapping beam arranged at the lower end of the module fixing beam, and an overlapping groove is formed in the side portion of the spliced bottom plate matched with any overlapping beam.

Through adopting above-mentioned technical scheme, improved the flexibility of each connecting portion on the box, also guaranteed the steadiness of box.

Preferably, the spliced bottom plate comprises 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, each longitudinal reinforcing beam comprises a third main beam, second lap edges arranged on two sides of the lower end of the third main beam, and second bosses arranged on the lower ends of any second lap edges, and second lap grooves are formed in the side ends of the spliced plates matched with any second bosses.

Preferably, any one of the splicing plates comprises an upper plate, a lower plate and a plurality of reinforcing beams arranged between the upper plate and the lower plate in parallel, any one of the reinforcing beams is parallel to the first main beam, the splicing plate comprises a first splicing plate and a second splicing plate arranged between the first splicing plate and any one of the first main beams, a first overlapping edge is arranged on the side portion of any one of the first splicing plates, a first overlapping groove is arranged on the corresponding side portion, and third overlapping grooves respectively matched with the first overlapping edge and the second boss are arranged on the side portions of the two ends of any one of the second splicing plates.

By adopting the technical scheme, the stability of the bottom plate is improved, the lap joint strength is improved, the use of materials is reduced, and the cost is reduced.

Preferably, the first main beam comprises a side wall, a fixing part arranged at the upper end of the side wall, and an isosceles triangle through groove and an isosceles right-angle through groove which are arranged in the side wall.

Through adopting above-mentioned technical scheme, the frame and the bottom plate of box are hollow structure, adopt aluminum alloy extrusion process to make, have the shaping efficient, advantages such as structural strength is good.

The utility model provides a battery pack, includes the box, set up the battery module in the box side by side and the thermal management subassembly of cooperation battery module, the thermal management subassembly is including setting up in the liquid cooling board between arbitrary row of battery module, setting up respectively in the water inlet and the delivery port at liquid cooling board both ends, the pipeline of cooperation water inlet and delivery port respectively, be equipped with horizontal recess in the liquid cooling board, the cooperation the water inlet is equipped with flow distribution device, arbitrary the pipeline is fixed in the box through the ribbon.

Through adopting above-mentioned technical scheme, the liquid cooling pipe passes through the ribbon to be fixed on the box, and above-mentioned fixed mode simple structure is reliable, has guaranteed the structural security of battery system in the operation process, has avoided the inefficacy risk of battery system liquid cooling system in the operation process.

As preferred, arbitrary battery module include electric core, the pencil division board of cooperation electric core, set up in the outside module end plate of electric core, module curb plate and module bottom plate, the lateral part of module end plate is equipped with the crossbeam of cooperation module fixed beam, and the cooperation is arbitrary the module fixed beam in installation fabrication hole is equipped with the dislocation piece.

Through adopting above-mentioned technical scheme, the battery module passes through on crossbeam overlap joint is fixed with first stiffening beam and frame, through this kind of fixed mode, realizes the effective transmission of load, shortens to pass distance between the power, promotes structural strength, installation fabrication hole and box fixed beam between be provided with initial dislocation, realize the control of the heat conduction pad's between module and the cold plate compression through the dislocation distance to guarantee that heat management system's reliable installation is fixed.

Preferably, a gap is formed between the battery module and the bottom plate, and buffering foam is arranged in the gap.

By adopting the technical scheme, the bottom surface impact damage resistance of the system is further improved, the service life of the battery pack is prolonged, and the effects of energy conservation and environmental protection are achieved.

Preferably, a heat conducting pad is arranged between the module bottom plate and the liquid cooling plate, and heat conducting glue is arranged between the module bottom plate and the battery core.

By adopting the technical scheme, the module bottom plate is well contacted with the liquid cooling plate by compressing the heat conducting pad, so that efficient heat dissipation is realized; the heat of the battery pack in the operation process is easily led out through the module bottom plate 23 through the heat-conducting glue.

The invention has the following advantages:

1. the box body of the aluminum profile tailor-welded battery pack is fixedly connected in a mode of splicing a plurality of structures, namely a male structure and a female structure, and then welding the two surfaces of the box body, and has the advantages of high strength, good light weight effect, high reliability, easiness in expansion and the like;

2. the utility model provides an aluminium alloy frame construction is formed by the combination of many parts, with module fixed beam, hang some combination to the frame section bar, adopts integrated into one piece's technology, is favorable to the high-efficient transmission of load, promotes the structural strength of battery package.

3. The utility model provides a module installation fixed mode adopts the end plate overlap joint fixed, has the buffering clearance between module bottom and the box, has promoted the anti ground damage ability of battery package, has promoted the security performance of system.

4. The heat management system and the arrangement mode thereof are provided, the heat management of a single cold plate to the double-row modules is realized by the opposite clamping arrangement of the double-row modules, the flow distribution and control can be realized through the flow distribution device, and the symmetrical arrangement of the water-cooling plate joints has the advantages of high efficiency, reliability, high integration efficiency, easy expansion and the like.

Drawings

FIG. 1: the battery pack of the invention is exploded;

FIG. 2: is a schematic view of the lower box body of the invention;

FIG. 3: is an enlarged structural schematic diagram of the framework of the invention;

FIG. 4: is a schematic cross-sectional view of a back beam of the present invention;

FIG. 5: is a structural schematic diagram of the bottom plate of the invention;

FIG. 6: is a schematic structural diagram of the splice plate of the invention;

FIG. 7: is a schematic structural view of a first stiffening beam of the invention;

FIG. 8: the splicing schematic diagram of the first stiffening beam and the splice plate is shown;

FIG. 9: is a cross-sectional schematic view of the lower box body of the invention;

FIG. 10: the invention is a schematic diagram of the lap joint and fixation of the frame and the bottom plate;

FIG. 11: is a schematic view of the lap joint fixation of the lap joint plate of the invention;

FIG. 12: is a schematic structural diagram of the battery module of the invention;

FIG. 13: is a schematic diagram of the internal structure of the battery module of the invention;

FIG. 14: is a schematic diagram of an end plate of the battery module of the invention;

FIG. 15: a schematic view of the battery module installation-bottom clearance of the invention;

FIG. 16: the invention is a schematic diagram of the installation of the battery module and the frame;

FIG. 17: the invention is a schematic view of the installation and fixation of the battery module and the stiffening beam;

FIG. 18: is a schematic view of the fixing mode of the liquid cooling plate;

FIG. 19: is a schematic structural view of the thermal management assembly of the present invention;

FIG. 20: is a schematic structural diagram of the heat conduction path of the present invention;

FIG. 21: is a schematic diagram of the structure of the liquid cooling plate of the present invention;

FIG. 22: is a schematic diagram of the internal structure of the lower cooling plate;

FIG. 23: is a schematic structural diagram of the flow distribution device of the invention;

FIG. 24: is a schematic diagram of the parallel connection mode of the liquid cooling plates;

FIG. 25: the connecting mode of the binding belt fixing pipeline is shown schematically;

FIG. 26: the connecting mode of the beam and the module fixing beam is shown schematically;

in the figure: 1. a lower box body; 2. a battery module; 3. a thermal management component; 4. an upper cover; 5. a gap; 11. a frame; 12. a base plate; 21. a module end plate; 22. a module side plate; 23. a module base plate; 24. a wire harness isolation plate; 25. an electric core; 26. heat conducting glue; 31. a liquid-cooled plate; 32. a pipeline; 33. a thermally conductive pad; 34. binding a belt; 313. a water inlet; 314. a water outlet; 3121. a transverse groove; 3122. a flow distribution device; 1122. a first main beam; 1121. an inner lapping beam; 1123. hanging a lug; 1132. a second main beam; 1131. hanging points; 1133. a module fixing beam; 11221. a side wall; 11222. an isosceles triangular through groove; 11223. a fixed part; 11224. an isosceles right-angle through groove; 11211. a first boss; 11213. a groove; 1134. overlapping the beams; 121 a second splice bar; 122. a longitudinal reinforcing beam; 123. transversely reinforcing the beam; 124. a first splice plate; 1214. A first overlapping edge; 1215. a first overlapping groove; 1221. a third main beam; 1222. the second tower connecting edge; 1223. a second boss; 1216. a second overlapping groove; 1211. an upper plate; 1212. a lower plate; 1213. a reinforcing beam; 211. a cross beam; 2111. a module fixing hole; 2112. mounting a process hole; 2113. a dislocation member; 11212. a hollow structure; 311. an upper cold plate; 312. and (5) a lower cooling plate.

Detailed Description

Referring to fig. 1 to 25, the battery pack case of the present embodiment includes a lower case 1, an upper cover 4 disposed at an upper end of the lower case 1, mounting portions respectively disposed at a periphery of the lower case 1, and a battery accommodating cavity disposed between the lower case 1 and the upper cover 4, where the lower case 1 includes a frame 11 and a spliced bottom plate 12 disposed in the frame 11, and the frame 11 includes a first main beam 1122 and a second main beam 1132 vertically disposed; a first connecting part matched with the spliced bottom plate 12 is arranged on the inner side of the first main beam 1122; the inboard second connecting portion that is equipped with cooperation concatenation formula bottom plate 12 of second girder 1132, the installation department includes hangers 1123 and hangs point 1131.

The box comprises upper cover 4 and lower box 1, lower box 1 comprises frame 11 and bottom plate 12, a battery accommodation cavity has been formed between 12 upper ends of bottom plate and the upper cover 4, be used for placing and installing battery module 2, frame 11 is two first girders 1122 that set up with bottom plate 12 central axis symmetry and two second girders 1132 that set up with bottom plate 12 central axis symmetry, first girder 1122 and second girder 1132 splice into an organic whole perpendicularly of each other, and fixed through the welded mode, the welding mode here is MIG welding. The hanging lug 1123 on the outer side of the first main beam 1122 is used for mounting and fixing the whole battery pack box body and the vehicle body structure.

The first connecting portion comprises an inner overlapping beam 1121 and a first boss 11211 arranged at the top end of the inner overlapping beam 1121, and a groove 11213 is formed at the end portion of the spliced bottom plate 12 matched with any one first boss 11211.

The second connecting 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 matched with the lap beam is formed in the side portion of the bottom plate 12.

The main body of the inner overlapping beam 1121 is a flat plate structure, and the flat plate structure includes a hollow structure 11212. The first boss 11211 is configured to mate with the recess 11213 in the end structure of the base 12 to form a 'male-female' snap fit, typically 5-10mm wide to ensure strength.

The spliced bottom plate 12 comprises a plurality of spliced plates arranged in an array, longitudinal reinforcing beams 122 arranged between any two rows of spliced plates, and transverse reinforcing beams 123 perpendicular to the longitudinal reinforcing beams 122, wherein each longitudinal reinforcing beam 122 comprises a third main beam 1221, second connecting flanges 1222 arranged on two sides of the lower end of the third main beam 1221, and second bosses 1223 arranged at the lower ends of the second connecting flanges 1222, and second connecting grooves 1216 are arranged at the side ends of the spliced plates 12 matched with any second bosses 1223.

The spliced bottom plate 12 is formed by splicing and welding a plurality of splice plates, a longitudinal reinforcing beam 122 and a transverse reinforcing beam 123, and the welding mode is friction stir welding.

The longitudinal reinforcing beam 122 is composed of a main beam 1221, overlapping edges 1222 and a second boss 223, the main beam 1221 is a hollow structure in a shape of 'lu', the structure of which is shown in fig. 8, and the upper surface of the main beam is provided with a fixing threaded hole for installing and fixing the battery module 2.

The arrangement mode of the transverse reinforcing beam 123 can be set to two modes, one mode is that the transverse reinforcing beam 123 is perpendicularly crossed with the longitudinal reinforcing beam 122 and is arranged on the lower end surface of the splicing plate, and the other mode is that the structure of the transverse reinforcing beam 123 can be set to be similar to that of the longitudinal reinforcing beam 122 and is in a T-shaped structure, so that the transverse reinforcing beam 123 is still perpendicularly crossed with the longitudinal reinforcing beam 122, and the splicing plate and the transverse reinforcing beam 123 are connected and fixed in a lapping mode.

The upper surfaces of the longitudinal reinforcing beam 122 and the transverse reinforcing beam 123 are provided with threaded holes. The screw holes are used for mounting and fixing the battery module 2.

Any splicing plate comprises an upper plate 1211, a lower plate 1212 and a plurality of reinforcing beams 1213 which are arranged between the upper plate 1211 and the lower plate 1212 in parallel, any reinforcing beam 1213 is parallel to the first main beam 1122, the splicing plate comprises a first splicing plate 124 and a second splicing plate 121 which is arranged between the first splicing plate 1214 and any first main beam 1122, a first lap edge 1214 is arranged at the side part of any first splicing plate 124, a first lap groove 1215 is arranged at the corresponding side part, and third lap grooves which are respectively matched with the first lap edge 1214 and the second boss 1223 are arranged at the side parts of two ends of any second splicing plate 121.

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

One side of the reinforcing beam 1213 corresponding to the side of the frame 11 has a certain distance with the edges of the upper plate 1211 and the lower plate 1212 to form a groove matched with the overlapping beam 1134 of the frame 11, and the overlapping beam 1134 is inserted to form a 'male-female' matching overlap joint, so that the overlapping fixation of the bottom plate 12 and the frame 11 is realized; the other side of the first reinforcing beam 122 is also spaced from the edges of the upper plate 1211 and the lower plate 1212 to form a second overlapping groove 1216 matched with the second boss 1223, and the second boss 1223 is inserted into the second overlapping groove 1216 to form a 'male-female' matching overlapping, so that the first reinforcing beam 122 is fixed to the splice plate 121 in an overlapping manner.

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

Isosceles triangle lead to groove 1122 and isosceles right angle lead to groove 1132 be hollow structure, adopt aluminum alloy extrusion process to make, have the shaping efficiently, advantages such as structural strength is good. In order to ensure the structural strength, the wall thickness of the outer wall 11221 is generally set to be 3-5 mm.

The cross section of the isosceles triangular through groove 11222 is an isosceles triangular structure, generally, the wall thickness of the isosceles triangular first through groove 11222 is set to be 1-3mm, and the obtuse angle thereof is set to be 100-150 °; the cross section of the isosceles right-angle through groove 11224 is in an isosceles right-angle triangular structure; the fixing portion 11223 is formed by a flat surface and an inner boss structure, and is used for mounting and fixing the seal ring and the upper cover 4, and circumferential positioning of the seal ring is realized by the boss structure.

The utility model provides a battery pack, includes the box, set up battery module 2 in the box side by side and the thermal management subassembly 3 of cooperation battery module 2, thermal management subassembly 3 is including setting up in the liquid cooling plate 31 between arbitrary row of battery module, setting up respectively in the water inlet 313 and the delivery port 314 at liquid cooling plate 31 both ends, set up respectively in the pipeline 32 of water inlet 313 and delivery port 314, be equipped with horizontal recess 3121 in the liquid cooling plate 31, the cooperation the water inlet 314 is equipped with flow distribution device 3122, arbitrary pipeline 32 passes through ribbon 34 to be fixed in the box.

Any battery module 2 include electric core 25, cooperation electric core 25's pencil division board 24, set up in the outside module end plate 21 of electric core 25, module curb plate 22 and module bottom plate 23, the lateral part of module end plate 21 is equipped with the crossbeam 211 of cooperation module fixed beam 1133, run through on the crossbeam 211 and be equipped with module fixed orifices 2111 and installation process holes 2112, the cooperation is arbitrary the module fixed beam 1133 of installation process holes 2112 is equipped with dislocation piece 2113.

A gap 5 is arranged between the battery module 2 and the bottom plate 12, and buffering foam is arranged in the gap 5.

Be equipped with heat conduction pad 33 between module bottom plate 23 and liquid cooling plate 31, be equipped with heat conduction glue 26 between module bottom plate 23 and electric core 25.

A battery pack comprises a lower box body 1, a battery module 2, a heat management assembly 3, an upper cover 4 and the like. The upper cover 4 is fixed on the lower box body 1 through bolts and forms a battery accommodating cavity together with the lower box body 1. Battery module 2 arrange in proper order and fix the battery that box 1 and upper cover 4 formed down and hold the intracavity, thermal management subassembly 3 is fixed in back row battery module 2's top through the mounting panel. The battery module 2 is formed by stacking a module end plate 21, a module side plate 22, a module bottom plate 23, a wiring harness isolation plate 24 and an internal battery core 25, wherein the module end plate 21 and the module side plate 22 are fixed in a welding mode to form a basic stress frame of the battery module 2.

The heat conducting glue 26 is filled between the module bottom plate 23 and the battery core 25, and the arrangement mode enables heat of the battery pack in the operation process to be easily led out through the module bottom plate 23.

The module end plate 21 has a T-shaped structure, and the cross beam 211 is used for mounting and fixing the battery module 2.

The battery module 2 is fixed on the longitudinal reinforcing beam 122, the transverse reinforcing beam 113 and the second main beam 1132 in an overlapping manner through the transverse beam 211, so that effective transmission of loads is realized, the distance between force transmission is shortened, and the structural strength is improved. The module crossbeam 211 on be provided with two pairs of module fixed orificess 2111 and installation handle hole 2112, set up respectively in both ends about module crossbeam 211, be equipped with the logical groove of cooperation module fixed orificess 2111 on the module fixed beam 1133, pass module fixed orifices 2111 and logical groove through the bolt, fix module crossbeam 211 in module fixed beam 1133 upper end, installation handle hole 2112 and the module fixed beam 1133 of box between be provided with dislocation piece 2113, agree with dislocation piece 2113 with installation handle hole 2112, realize the control of the heat conduction pad 33's between module bottom plate 23 and the liquid cold plate 31 compressibility through the dislocation distance to guarantee the reliable installation of the system of thermal management subassembly 3 and fix.

The battery module 2 is installed under box 1 after, under the battery module 2 the bottom surface with there is clearance 5 between the upper surface of

bottom plate

12, 5 thickness in clearance is 5~8mm, through this kind of 5 settings in clearance, promotes the distance between battery module 2 and bottom surface 12, realizes the resistant bottom surface striking damage resistance of battery package.

The liquid cooling plate 31 is placed in the middle of any two rows of battery modules 2 and fixed through mutual clamping of the two rows of battery modules 2, the two rows of battery modules 2 are arranged oppositely, and the upper surface and the lower surface of the liquid cooling plate 31 are contacted through the bottom plate of the battery modules 2.

Liquid cooling plate 31 is fixed through double module centre gripping, has the advantage:

1. the liquid cooling plate is connected into a whole through the heat conducting pad and the clamping force between the modules, and the liquid cooling system moves together with the modules under the action of external loads such as vibration and impact in the operation process of the power battery system, so that the liquid cooling system is ensured to be in good contact with the modules all the time, and the reliability of the heat management system is improved;

2. the liquid cooling is arranged between the two rows of modules of the module, so that the double rows of modules are cooled by a single cold plate, and the integrated circuit has the advantage of high integration efficiency;

3. the liquid cooling plate is clamped and fixed through the left row of modules and the right row of modules, and the water inlets and the water outlets of the liquid cooling plate are arranged perpendicular to the liquid cooling plate, so that the design space is saved and the energy density of the system is improved by the coaxial arrangement of the water inlets and the water outlets;

4. the inside flow control device that is equipped with of liquid cooling board realizes the flow control between the different liquid cooling boards through the opening size, has guaranteed the temperature uniformity between the different modules.

A heat conducting pad is arranged between the module bottom plate 23 and the liquid cooling plate, and 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.

The water inlet 313 and the water outlet 314 are respectively arranged at two ends of the liquid cooling plate 31, and the outlet direction of the water inlet/outlet is arranged along the normal direction of the liquid cooling plate 31, so that the space utilization rate of the liquid cooling system is effectively improved by the arrangement mode.

The transverse groove 3121 is disposed in the lower cold plate, and after the upper cold plate 311 and the lower cold plate 312 are sealed in a butt joint manner, a liquid flow passage is formed in the transverse groove 3121.

The water inlet 313 and the water outlet 314 are respectively arranged at two sides of the lower cooling plate, the flow distribution device 3122 is arranged in the water inlet 313, the flow of the liquid cooling plates is controlled by controlling the size of the opening 31221, and the flow uniformity of the plurality of parallel liquid cooling plates is ensured.

Meanwhile, the invention provides a liquid cooling plate parallel connection mode with a compact structure, as shown in fig. 24, 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 heat management system is saved, and the integration level of the system is improved.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. The utility model provides a battery package box, includes box (1) down, sets up in upper cover (4) of box (1) upper end down, sets up respectively in box (1) peripheral installation department down and sets up the battery between box (1) and upper cover (4) down and hold the chamber, its characterized in that: the lower box body (1) comprises a frame (11) and a spliced bottom plate (12) arranged in the frame (11), wherein the frame (11) comprises a first main beam (1122) and a second main beam (1132) which are vertically arranged; a first connecting part matched with the spliced bottom plate (12) is arranged on the inner side of the first main beam (1122); the inboard second connecting portion that is equipped with cooperation concatenation formula bottom plate (12) of second girder (1132).

2. The battery pack case according to claim 1, wherein: the first connecting portion comprises an inner overlapping beam (1121) and a first boss (11211) arranged at the top end of the inner overlapping beam (1121), and a groove (11213) is formed in the end portion, matched with any one first boss (11211), of the spliced bottom plate (12).

3. The battery pack case according to claim 1, wherein: the second connecting portion include module fixed beam (1133) and set up in connecing of module fixed beam (1133) lower extreme and take roof beam (1134), cooperate arbitrary connecing roof beam (1134) concatenation formula bottom plate (12) lateral part is equipped with connects and takes the recess.

4. The battery pack case according to claim 1, wherein: the splicing type bottom plate (12) comprises a plurality of splicing plates arranged in an array mode, longitudinal reinforcing beams (122) arranged between any two rows of splicing plates and transverse reinforcing beams (123) perpendicular to the longitudinal reinforcing beams (122), each longitudinal reinforcing beam (122) comprises a third main beam (1221), second connecting butt straps (1222) arranged on two sides of the lower end of the third main beam (1221) and second bosses (1223) arranged at the lower end of any second connecting butt strap (1222), and second connecting butt grooves (1216) are formed in the splicing plate side ends matched with any second bosses (1223).

5. The battery pack case according to claim 4, wherein: the splice plate comprises an upper plate (1211), a lower plate (1212) and a plurality of reinforcement beams (1213) arranged between the upper plate (1211) and the lower plate (1212) in parallel, wherein any reinforcement beam (1213) is parallel to the first main beam (1122), the splice plate comprises a first splice plate (124) and a second splice plate (121) arranged between the first splice plate (124) and any first main beam (1122), a first overlap edge (1214) is arranged on the side of any first splice plate (124), a first overlap groove (1215) is arranged on the corresponding side, and third overlap grooves respectively matched with the first overlap edge (1214) and the second boss (1223) are arranged on the sides of the two ends of any second splice plate (121).

6. The battery pack case according to claim 1, wherein: the first main beam (1122) comprises a side wall (11221), a fixing part (11223) arranged at the upper end of the side wall (11221), an isosceles triangle through groove (11222) and an isosceles right-angle through groove (11224) which are arranged in the side wall (11221).

7. A battery pack, comprising: the battery pack box comprises the battery pack box body as claimed in any one of claims 1 to 6, battery modules (2) arranged in the box body in parallel and a heat management assembly (3) matched with the battery modules (2), wherein the heat management assembly (3) comprises liquid cooling plates (31) arranged among any row of battery modules (2), a water inlet (313) and a water outlet (314) respectively arranged at two ends of the liquid cooling plates (31) and pipelines (32) respectively matched with the water inlet (313) and the water outlet (314), transverse grooves (3121) are arranged in the liquid cooling plates (31), a flow distribution device (3122) is arranged in a matched manner with the water inlet (313), and any pipeline (32) is fixed in the box body through a binding belt (34).

8. The battery pack according to claim 7, wherein: any battery module (2) including electric core (25), wiring harness division board (24) of cooperation electric core (25), set up in outside module end plate (21), module curb plate (22) and module bottom plate (23) of electric core (25), the lateral part of module end plate (21) is equipped with crossbeam (211) of cooperation module fixed beam (1133), it is equipped with module fixed orifices (2111) and installation process hole (2112) to run through on crossbeam 211, and the cooperation is arbitrary module fixed beam (1133) of installation process hole (2112) are equipped with dislocation piece (2113).

9. The battery pack according to claim 7, wherein: a gap (5) is arranged between the battery module (2) and the bottom plate (12), and buffering foam is arranged in the gap (5).

10. The battery pack according to claim 8, wherein: be equipped with heat conduction pad (33) between module bottom plate (23) and liquid cooling board (31), be equipped with between module bottom plate (23) and electric core (25) and lead thermal glue (26).