CN112008271A - Battery box and manufacturing method thereof - Google Patents

Battery box and manufacturing method thereof Download PDF

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Publication number
CN112008271A
CN112008271A CN201910458384.4A CN201910458384A CN112008271A CN 112008271 A CN112008271 A CN 112008271A CN 201910458384 A CN201910458384 A CN 201910458384A CN 112008271 A CN112008271 A CN 112008271A
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CN
China
Prior art keywords
plate
liquid cooling
welding
plug
side plate
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Pending
Application number
CN201910458384.4A
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Chinese (zh)
Inventor
卢臣智
王林飞
赵书广
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Zhengzhou Shenlan Power Technology Co Ltd
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Zhengzhou Shenlan Power Technology Co Ltd
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Application filed by Zhengzhou Shenlan Power Technology Co Ltd filed Critical Zhengzhou Shenlan Power Technology Co Ltd
Priority to CN201910458384.4A priority Critical patent/CN112008271A/en
Publication of CN112008271A publication Critical patent/CN112008271A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
    • B23K28/02—Combined welding or cutting procedures or apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

The invention provides a battery box body and a manufacturing method thereof, the battery box body comprises a liquid cooling plate, the liquid cooling plate comprises a bottom plate and a front plug, a flow channel is arranged in the bottom plate, a flow channel groove is arranged in the front plug, a communication port communicated with the flow channel in the bottom plate is arranged on the side surface of the flow channel groove, a plug block is arranged at the communication port, the plug block is provided with an extending part and an extending part, the peripheral side surface of the extending part and the side surface of the liquid cooling plate are welded and fixed through arc welding to form a circle of plug block welding line and seal the communication port, an avoiding groove for avoiding the extending part and the plug block welding line is arranged on a left side plate and/or a right side plate, the thickness of the plug block welding line in the vertical direction is larger than the height of a stirring head of friction. Has the advantages that: when the left side plate and/or the right side plate are/is welded by friction stir welding subsequently, the stirring head can not completely damage the welding line of the chock block, the sealing effect of the welding line of the chock block on the communication port is ensured not to be damaged, and the cooling liquid is ensured not to leak.

Description

Battery box and manufacturing method thereof
Technical Field
The invention relates to a battery box body and a manufacturing method thereof.
Background
In order to meet the requirement of light weight, the design scheme of the profile box adopted in the new energy industry is wider at present. Along with the wide application of large electric core and quick charge, the heat dissipation problem is more and more outstanding, and the section bar box body integrating the liquid cooling function appears in the market at present.
Fig. 1 shows a battery box in the prior art, which includes a liquid cooling plate at the bottom, and a left side plate 4, a right side plate 5, a front side plate 2, and a rear side plate 3 fixed around the liquid cooling plate, wherein the liquid cooling plate is an assembly including a bottom plate 1 and a front plug 7 that are inserted and connected together. As shown in fig. 3, a flow passage 1-1 through which a cooling liquid flows is provided in the bottom plate 1. As shown in fig. 2, two flow channel grooves 72 are provided at the left and right ends of the front plug 7, the rear ends of the two flow channel grooves 72 are communicated with the flow channel 1-1 in the base plate 1, the front ends of the two flow channel grooves 72 extend into the bosses 71, and the bosses 71 are communicated with the water nozzles 6, so that the cooling liquid can be input into the base plate 1 through the water nozzles 6 and the flow channel grooves 72 at one end, the cooling liquid flows in the base plate 1 to dissipate heat of the battery pack, and then flows out of the box body through the flow channel grooves 72 and the water nozzles 6 at the other end.
In the manufacturing process of the battery case, the front plug 7 and the bottom plate 1 need to be welded and fixed, and a friction stir welding method is generally adopted at present, but since the flow channel groove 72 is processed on the front plug 7, that is, the position of the flow channel groove 72 is hollow, and when the flow channel groove is welded to the position, the flow channel groove 72 is easily deformed, so that in order to avoid the deformation, a filling block is usually inserted into the flow channel groove 72 to temporarily fill the flow channel groove 72. Thus, it is necessary to provide the sides of the runner duct 72 in an open structure so as to be able to be inserted into the filling block, i.e., the rear and sides of the runner duct 72 are open.
After current end cap 7 and bottom plate 1 welded fastening, need take out the filling block, follow-up still need carry on left side board 4, right side board 5 and preceding end cap 7 and bottom plate 1 between the welded fastening, that is to say, after bottom plate 1 and preceding end cap 7 and posterior lateral plate 3 welded well, can leave the intercommunication mouth that is linked together with the runner in the bottom plate 1 on the liquid cooling board side of making up. At present, this intercommunication mouth is through when welding left side board 4 and right side board 5, utilizes left side board 4 and right side board 5 to block up it to avoid the weeping, but what this kind of mode relied on is the inseparable laminating of curb plate and liquid cooling board side, and is difficult to accomplish in fact, consequently sealed unreliable, takes place the weeping phenomenon easily. And the left side plate 4 and the right side plate 5 are required to have higher surface quality, and the bottom plate 1 and the front plug 7 are also required to have higher side quality, so that the manufacturing difficulty is increased, the manufacturing cost of the box body is improved, and the welding difficulty is higher.
Disclosure of Invention
The invention aims to provide a battery box body which has a good sealing effect and can avoid liquid leakage; the invention also aims to provide a manufacturing method of the battery box body, which has a good sealing effect and can avoid the liquid leakage phenomenon.
In order to achieve the purpose, the battery box body adopts the following technical scheme:
a battery box comprises a liquid cooling plate, a left side plate, a right side plate, a front side plate and a rear side plate which are respectively welded and fixed with the liquid cooling plate, wherein the liquid cooling plate comprises a bottom plate and a front plug welded and fixed on the front side of the bottom plate, a flow channel for cooling liquid to circulate is arranged in the bottom plate, flow channel grooves communicated with the flow channel in the bottom plate are respectively arranged at the left end and the right end in the front plug, one of the two flow channel grooves is used for external cooling liquid to flow into the bottom plate, the other is used for cooling liquid to flow out of the liquid cooling plate, a communication port communicated with the flow channel in the bottom plate is arranged on the side surface of the combination part of at least one flow channel groove and the bottom plate, a plug block used for plugging the communication port is arranged at the communication port, the plug block is provided with an extending part extending into the communication port and an extending part positioned outside the communication port, a set distance is arranged between the upper surface of the extending part and the upper surface of the liquid, the peripheral side face of the extending portion and the side face of the liquid cooling plate are welded and fixed through arc welding to form a circle of chock welding seams and seal the communicating port, an avoiding groove used for avoiding the extending portion and the chock welding seams is formed in the left side plate and/or the right side plate, the liquid cooling plate and the left side plate and/or the right side plate are welded and fixed through friction stir welding, the thickness of the chock welding seams in the vertical direction is larger than the height of a stirring head of the friction stir welding to avoid the chock welding seams from being completely damaged by the stirring head of the friction stir welding, and the width of the chock welding seams in the left and right directions is smaller than the width of the welding seams of the friction stir welding to enable the welding seams of the friction stir welding to cover the chock welding seams and the edges of the liquid cooling plate and the left side.
The technical scheme of the battery box body has the beneficial effects that: the plug blocks are plugged into the communication port, the extending parts are reserved outside the communication port, the distance between the upper surfaces of the extending parts and the upper surface of the liquid cooling plate can ensure that enough plug block welding seam forming space is reserved at the position, the distance between the lower surfaces of the extending parts and the lower surface of the liquid cooling plate can ensure that enough plug block welding seam forming space is reserved at the position, and the thickness of the plug block welding seam in the vertical direction is larger than the height of a stirring head of friction stir welding, so that the plug block welding seam cannot be completely damaged when the liquid cooling plate and the left side plate and/or the right side plate are welded in the subsequent friction stir welding process, the sealing effect of the plug block welding seam on the communication port is not damaged, the cooling liquid is prevented from leaking, and the sealing effect is good; and the recess of dodging that sets up on left side board and/or the right side board then can guarantee that left side board and/or right side board align with the liquid cooling board, and the width of chock welding seam on left right side direction is less than friction stir welding's welding seam width simultaneously to the welding seam that can make friction stir welding covers the edge of chock welding seam and liquid cooling board and left side board or right side board, accomplishes the welded fastening between liquid cooling board and left side board or the right side board smoothly.
Furthermore, in order to control the plugging degree of the plugging block and facilitate the installation of the plugging block, the extending part of the plugging block is provided with a stopping edge matched with the side surface of the liquid cooling plate in a stopping way.
Furthermore, in order to facilitate the processing and manufacturing of the plug, enough plug welding seams are reserved between the upper surface and the lower surface of the extending portion and the side surface of the liquid cooling plate to form a space, the plug is T-shaped, two stop edges are arranged and are respectively located at the front end and the rear end of the extending portion, and the upper surface and the lower surface of the extending portion are respectively flush with the upper surface and the lower surface of the extending portion.
Furthermore, in order to facilitate the installation of the chock block, the end part of the extending part is provided with a guide inclined plane which is convenient for the chock block to be plugged into the communicating port.
Further, in order to guarantee the welding tightness between the bottom plate and the rear side plate, the sealing effect is prevented from being damaged by subsequent friction stir welding, the left end and the right end of the rear portion of the bottom plate are respectively provided with a corner cut, a corner groove is formed between the corner cut and the rear side plate in a surrounding mode, the corner cut and the rear side plate are fixed through arc welding to form a corner welding seam in the corner groove, the length of the corner welding seam in the vertical direction is larger than the height of a stirring head of the friction stir welding, and the corner welding seam is prevented from being completely damaged by the stirring head of the friction stir welding.
In order to achieve the purpose, the manufacturing method of the battery box adopts the following technical scheme:
a manufacturing method of a battery box comprises the steps of welding and fixing a bottom plate and a front plug to form a liquid cooling plate, and then plugging a plug block into a communication port left on the side surface of the liquid cooling plate before the liquid cooling plate is welded with a left side plate and/or a right side plate, so that one part of the plug block extends into the communication port to form an extending part, the rest part of the plug block is positioned outside the communication port to form an extending part, and meanwhile, a set distance is reserved between the upper surface of the extending part and the upper surface of the liquid cooling plate, and/or a set distance is reserved between the lower surface of the extending part and the lower surface of the liquid cooling plate; then, welding and fixing the peripheral side surface of the extending part and the side surface of the liquid cooling plate by arc welding to form a circle of chock welding seams to seal the communication port, and correspondingly machining avoidance grooves which avoid the extending part and the chock welding seams on the left side plate and/or the right side plate in advance; then respectively aligning the left side plate and the right side plate with the liquid cooling plate, welding and fixing the liquid cooling plate with the left side plate and the right side plate by friction stir welding, and controlling the thickness of the plug welding line in the vertical direction to enable the thickness of the plug welding line to be larger than the height of a stirring head of the friction stir welding, so that the plug welding line is prevented from being completely damaged by the stirring head of the friction stir welding; meanwhile, the width of the chock welding seam in the left and right directions is controlled to be smaller than the width of the friction stir welding seam, so that the friction stir welding seam can cover the chock welding seam and the edges of the liquid cooling plate and the left side plate or the right side plate.
The technical scheme of the manufacturing method of the battery box body has the beneficial effects that: the plug blocks are plugged into the communication port, the extending parts are reserved outside the communication port, the distance between the upper surfaces of the extending parts and the upper surface of the liquid cooling plate can ensure that enough plug block welding seam forming space is reserved at the position, the distance between the lower surfaces of the extending parts and the lower surface of the liquid cooling plate can ensure that enough plug block welding seam forming space is reserved at the position, and the thickness of the plug block welding seam in the vertical direction is larger than the height of a stirring head of friction stir welding, so that the plug block welding seam cannot be completely damaged when the liquid cooling plate and the left side plate and/or the right side plate are welded in the subsequent friction stir welding process, the sealing effect of the plug block welding seam on the communication port is not damaged, the cooling liquid is prevented from leaking, and the sealing effect is good; and set up in advance on left side board and/or right side board and dodge the recess, then can guarantee that left side board and/or right side board align with the liquid cooling board, the width of chock welding seam on the left and right sides direction is less than friction stir welding's welding seam width simultaneously to the welding seam that can make friction stir welding covers the chock welding seam and the edge of liquid cooling board and left side board or right side board, accomplishes the welded fastening between liquid cooling board and left side board or the right side board smoothly.
Furthermore, in order to facilitate the installation of the chock block, when the chock block is manufactured, a stop edge matched with the side face stop of the liquid cooling plate is arranged on the extending part of the chock block so as to control the plugging degree of the chock block.
Furthermore, in order to facilitate the processing and manufacturing of the plug, enough plug weld forming space is reserved between the upper surface and the lower surface of the extending portion and the side surface of the liquid cooling plate.
Furthermore, in order to facilitate the installation of the chock, when the chock is manufactured, a guide inclined plane which is convenient for the chock to be plugged into the communicating port is processed at the end part of the extending part.
Further, in order to ensure the welding tightness between the bottom plate and the rear side plate and simultaneously avoid the sealing effect from being damaged by subsequent friction stir welding, before the liquid cooling plate is welded with the left side plate and the right side plate, the bottom plate is welded and fixed with the rear side plate, the cut angles are processed at the left end and the right end of the rear part of the bottom plate in advance respectively, so that a corner groove is formed between the cut angles and the rear side plate in a surrounding mode, then the cut angles and the rear side plate are welded and fixed by means of arc welding, so that corner welding seams are formed in the corner groove, and the height of the corner welding seams is larger than the height of stirring heads of the friction stir welding by controlling the length of the corner welding seams in the vertical direction, so that the corner welding seams are prevented from.
Drawings
FIG. 1 is a block diagram of a battery case according to the prior art;
FIG. 2 is a block diagram of the front plug of FIG. 1;
FIG. 3 is a block diagram of the base plate of FIG. 1;
FIG. 4 is a perspective view of a battery case according to the present invention;
FIG. 5 is a top view of the battery case of the present invention;
FIG. 6 is an enlarged view of a portion of FIG. 5;
FIG. 7 is a state diagram of the battery case of the present invention after the bottom plate is welded to the front bulkhead and the rear side plate (no repair welding is performed at this time);
FIG. 8 is an enlarged view taken at A in FIG. 7;
FIG. 9 is a block diagram of the plug of FIG. 8;
FIG. 10 is an enlarged view at B of FIG. 7;
fig. 11 is a state diagram of the battery case of the present invention after the welding of the bottom plate with the front plugs and the rear side plate is completed (the repair welding is completed);
FIG. 12 is an enlarged view at C of FIG. 11;
fig. 13 is an enlarged view at D in fig. 11.
In the figure: 1. a base plate; 1-1. a flow passage; 2. a front side plate; 3. a rear side plate; 4. a left side plate; 5. a right side plate; 6. a water nozzle; 7. a front plug; 71. a boss; 72. a runner groove; 8. a left side plate; 9. a rear side plate; 10. a right side plate; 11. a base plate; 12. a water nozzle; 13. a front plug; 14. a front side plate; 15. friction stir welding the weld; 16. a chock weld; 17. a chock block; 171. a guide slope; 172. a stopping edge; 18. a communication port; 19. an angular groove; 20. a fillet weld.
Detailed Description
One embodiment of the battery box body of the invention is shown in fig. 4 and 5, and comprises a liquid cooling plate at the bottom, and a left side plate 8, a right side plate 10, a front side plate 14 and a rear side plate 9 which are welded and fixed on the periphery of the liquid cooling plate, wherein the liquid cooling plate is an assembly which comprises a bottom plate 11 and a front plug 13 which are welded together through friction stir welding, and the front plug 13 is welded and fixed on the front side of the bottom plate 11. The liquid cooling plate is welded and fixed with the left side plate 8, the right side plate 10 and the rear side plate 9 through friction stir welding, and a formed friction stir welding seam 15 is shown in fig. 5.
Flow channels (not shown in fig. 4 to 13) for cooling liquid to flow through are arranged in the bottom plate 11, flow channel grooves (not shown in fig. 4 to 13) communicated with the flow channels in the bottom plate 11 are respectively arranged at the left end and the right end in the front plug 13, the two flow channel grooves are respectively communicated with the water nozzle 12, one of the flow channel grooves is used for external cooling liquid to flow into the bottom plate 11, and the other flow channel groove is used for cooling liquid in the bottom plate 11 to flow out of the liquid cooling plate. Specifically, the structures of the bottom plate 11 and the front plug 13 in this embodiment are the same as those of the bottom plate and the front plug in the prior art (refer to fig. 1 to fig. 3 specifically), so after the bottom plate 11 and the front plug 13 are welded and fixed, a communicating port 18 communicated with the flow channel in the bottom plate 11 is left on the side surface of the joint of each flow channel groove and the bottom plate 11, and the rest of the structures are the same as those in the prior art, and are not repeated in this embodiment.
Different from the above, the communication port 18 is provided with the plug 17 for plugging the communication port 18, as shown in fig. 8 and 9, the plug is T-shaped, a part of the plug extends into the communication port to form an extending portion, the remaining part of the plug is located outside the communication port to form an extending portion, and the front end and the rear end of the extending portion are respectively provided with the stopping edges 172 matched with the liquid cooling plate side surface stopping, so that the plugging degree of the plug can be controlled, and the installation of the plug 17 is facilitated. Further, in order to facilitate the insertion of the plug into the communication port, a guide slope 171 is provided at an end of the protruding portion.
The upper and lower surfaces of the extension are flush with the upper and lower surfaces of the extension, respectively, so that when the chock is inserted into the communication port 18, a distance is formed between the upper surface of the extension and the upper surface of the liquid-cooled plate, which distance ensures that there is sufficient chock weld forming space. Similarly, the lower surface of the protruding part and the lower surface of the liquid cooling plate form a certain distance, and the distance can also ensure that enough space for forming the chock weld seam is formed at the position. The peripheral side surface of the extending portion and the side surface of the liquid cooling plate are fixed by arc welding to form a circle of plug welding seams 16, as shown in fig. 11 and 12, the plug welding seams 16 completely seal the communication port 18, so that the cooling liquid is prevented from leaking, and the sealing effect is good.
Since the plugs 17 have protruding portions and plug welds are present around the protruding portions, in order to ensure that the left and right side plates 8, 10 can be aligned with the liquid cooling plates, avoiding grooves are provided on both the left and right side plates 8, 10, as shown in fig. 6.
Because left side board 8 and right side board 10 all pass through friction stir welding and liquid cold plate welded fastening, also in the joint that friction stir welding's stirring head can insert liquid cold plate and left side board 8 or right side board 10, in order to avoid the stirring head to destroy completely welded chock weld 16 in the motion process, and then influence sealed effect, at chock weld 16's formation in-process, need control its thickness in the upper and lower side. Specifically, on the premise of ensuring that the plug welding seam 16 on the upper side of the extending part is flush with the upper surface of the liquid cooling plate as much as possible, the thickness of the plug welding seam is required to be larger than the height of the stirring head, so that the plug welding seam 16 cannot be completely destroyed even if the stirring head passes through the plug welding seam 16 on the upper side, and the sealing performance of the communication port 18 is further ensured.
Similarly, because the upper and lower surfaces of the liquid cooling plate, the left side plate 8 and the right side plate 10 are all required to be subjected to friction stir welding, on the premise that the lower surface of the liquid cooling plate is flush with the lower surface of the plug welding seam 16 on the lower side of the extension part as far as possible, the thickness of the plug welding seam is required to be larger than the height of the stirring head, so that the plug welding seam 16 cannot be completely destroyed even if the stirring head passes through the lower side plug welding seam 16, and the sealing performance of the communication port 18 is further guaranteed. In addition, the lengths of the plug welds 16 on the left and right sides of the protruding portion in the up-down direction are equal to the thickness of the liquid cooling plate (obviously, the thickness in the up-down direction is much greater than the height of the stirring head), so long as the upper plug weld and the lower plug weld are not completely destroyed, the left and right plug welds can also ensure the sealing performance of the communication port 18.
In order to ensure that the liquid cooling plate can be welded and fixed with the left side plate 8 or the right side plate 10, the width of the plug welding seam 16 in the left-right direction needs to be controlled, that is, the width of the extending part in the left-right direction is controlled, and the width of the extending part is ensured to be smaller than the width of the friction stir welding seam 15, so that the friction stir welding seam 15 can cover the edges of the plug welding seam 16, the liquid cooling plate and the left side plate 8 or the right side plate 10, as shown in fig. 6.
In this embodiment, the rear end of the bottom plate 11 is closed, the bottom plate 11 and the rear side plate 9 are in end surface contact, and during welding, friction stir welding needs to be performed on the upper and lower surfaces of the bottom plate 11 and the rear side plate 9 respectively, so that sealing is achieved on the upper and lower sides of the bottom plate 11 in contact with the rear side plate 9. In order to further ensure the sealing performance of the battery box, it is necessary to seal the left and right sides of the bottom plate 11 in contact with the rear side plate 9, for this purpose, the left and right ends of the rear portion of the bottom plate 11 are respectively provided with a chamfer, the chamfer and the rear side plate 9 define a fillet groove 19 therebetween, and the chamfer and the rear side plate 9 are fixed by arc welding to form a fillet 20 in the fillet groove 19, as shown in fig. 13.
Because friction stir welding is carried out between the liquid cooling plate and the left and right side plates 8 and 10 in the following process, in order to avoid the fillet weld 20 from being completely damaged by the stirring head of the friction stir welding and to keep the sealing effect from being affected, the length of the fillet weld 20 in the vertical direction needs to be controlled to ensure that the length is greater than the height of the stirring head, and therefore, even if the stirring head passes through the position of the fillet weld 20, the fillet weld 20 cannot be completely damaged.
The manufacturing method of the battery box body is that, the embodiment of the manufacturing method of the battery box body in the invention is as follows:
referring to fig. 4 to 13, when manufacturing the battery case, it is necessary to provide a flow channel in the bottom plate 11, and to process two flow channel grooves in the front plug 13, and to facilitate friction stir welding between the bottom plate 11 and the front plug 13, a filler block needs to be inserted into the flow channel groove before welding, so that the side surface of the portion of the flow channel groove that is joined to the bottom plate must be provided with two communication ports 18 that communicate with the flow channel in the bottom plate, in this embodiment, there are two communication ports 18. In addition, two T-shaped blocks 17 are required to be machined, and an avoidance groove is machined on each of the left side plate 8 and the right side plate 10. In addition, the left and right ends of the rear part of the bottom plate are respectively required to be processed with chamfers.
After the preparation work is finished, the welding sequence of the battery box bodies is as follows:
firstly, the front side plate 14 and the front plug 13 may be welded and fixed, and then the front plug 13 and the bottom plate 11 may be welded together by friction stir welding, in this process, a filling block needs to be inserted into the communication opening 18 to avoid deformation of the front plug 13, and the filling block is taken out after welding. And then welding the bottom plate 11 and the rear side plate 9 together by friction stir welding, wherein the front plug 13 and the bottom plate 11, and the bottom plate 11 and the upper and lower surfaces of the rear side plate 9 are required to be welded.
And then, starting a repair welding operation, and firstly plugging the processed T-shaped plug block 17 into the communication port 18, wherein the plug block 17 is different from the previously used filling block, the length of the filling block extending into the communication port 18 is longer, the runner groove needs to be completely filled to avoid deformation of the front plug, and the extending part of the plug block 17 is shorter to avoid influencing the normal circulation of the cooling liquid.
After the plug 17 is installed, since friction stir welding cannot be used around the plug, the peripheral side surface of the protruding portion of the plug and the side surface of the liquid cooling plate are welded and fixed by arc welding (which may be arc welding or argon arc welding) to form a ring of plug welding 16 to seal the communication port. The parameters of the plug welds 16 are controlled, wherein the plug welds on the upper and lower sides of the overhang are flush with the upper and lower surfaces of the liquid cooled plate, respectively, and the thickness in the up-down direction is greater than the height of the stir head of the friction stir welding, and the length of the plug welds on the left and right sides of the overhang is equal to the thickness of the liquid cooled plate (and is, of course, greater than the height of the stir head). In addition, it is necessary to control the width of the plug weld 16 in the left-right direction to be smaller than the width of the friction stir weld 15.
Then, the fillet groove 19 enclosed between the chamfer of the bottom plate 11 and the rear side plate 9 is subjected to repair welding, and a fillet weld 20 is formed in the fillet groove 19 by arc welding (which may be arc welding or argon arc welding), wherein the length of the fillet weld 20 in the vertical direction needs to be controlled to be larger than the height of the stirring head of friction stir welding.
After the equal repair welding in four positions of bottom plate 11, align right side board 10 with the liquid cooling board, then carry out friction stir welding along the seam of right side board 10 with the liquid cooling board, can be with right side board 10 and liquid cooling board welded fastening to when covering chock weld seam 16, can also guarantee not to destroy chock weld seam 16 and fillet weld 20 completely, guaranteed the leakproofness. The right side plate 10 and the liquid cooling plate need to be welded on both the upper and lower surfaces.
Finally, the bottom plate 11 and the left side plate 8 are welded and fixed in the same manner as the right side plate 10, thereby completing the welding operation of the box body.
In other embodiments of the battery box body and the battery box body manufacturing method, the bottom plate can be welded with the left side plate first, and then welded with the right side plate; or the bottom plate and the rear side plate can be welded firstly and then welded with the front plug; or the bottom plate and the front plug can be welded firstly, and then the front plug and the front side plate can be welded.
In other embodiments of the battery case and the method of manufacturing the battery case, the left and right ends of the rear portion of the bottom plate may not be chamfered, and at this time, the fillet welding operation is not required.
In other embodiments of the battery case and the battery case manufacturing method, the end of the insertion portion of the stopper may not be provided with the guide slope when the stopper is manufactured.
In other embodiments of the battery box and the battery box manufacturing method, when the plug is manufactured, the blocking edges may be arranged at the upper end, the lower end, the front end and the rear end of the plug, and at this time, it is required to ensure that sufficient distances are provided between the upper blocking edge and the upper surface of the liquid cooling plate and between the lower blocking edge and the lower surface of the liquid cooling plate, so as to form a plug welding seam meeting the requirement.
In other embodiments of the battery case and the battery case manufacturing method, the stopper may not be provided with a stopper edge when the stopper is manufactured, for example, the stopper is a rectangular parallelepiped or a square.
In other embodiments of the battery box and the battery box manufacturing method, a communication port may be provided only on one of the left-end runner groove and the right-end runner groove, and the other side is closed, and at this time, only one plug block needs to be prepared, and certainly, only one of the left side plate and the right side plate needs to be provided with an avoiding groove, and at this time, only the side plate provided with the avoiding groove needs to be welded and fixed with the liquid cooling plate by friction stir welding, and the other side plate does not have the avoiding groove, and the corresponding side surface of the liquid cooling plate does not have the communication port and the plug block, and the problem that whether the plug block weld is damaged by the stir head does not need to be considered, so friction stir welding can be adopted between the side plate and the liquid cooling plate, and argon arc welding or brazing can also be adopted.
In other embodiments of the battery box body and the battery box body manufacturing method, under the condition that the plate thickness of the liquid cooling plate is large enough, if the communication port is close to the upper part, only a set distance is required to be kept between the upper surface of the protruding part of the plug block and the upper surface of the liquid cooling plate, namely, the thickness of the welding seam of the plug block on the upper side is ensured to meet the requirement, and because the distance between the lower surface of the protruding part and the lower surface of the liquid cooling plate is larger, the stirring head can not contact the welding seam of the plug block on the lower side at all, the problem of the distance between the lower surface of the protruding part and the lower surface of the liquid cooling plate does not need to be; of course, when the plate thickness of the liquid cooling plate is large enough, and the communicating opening is lower, only the distance set between the lower surface of the extending part of the chock and the lower surface of the liquid cooling plate needs to be ensured, that is, the thickness of the welding seam of the chock at the lower side can be ensured to meet the requirement, and because the distance between the upper surface of the extending part and the upper surface of the liquid cooling plate is larger, the stirring head can not contact the welding seam of the chock at the upper side at all, the problem of the distance between the upper surface of the extending part and the upper surface of the liquid cooling plate does not need to be considered at the moment, that is, the thickness of the welding seam of the chock.
In other embodiments of the battery box body and the manufacturing method of the battery box body, argon arc welding or brazing can be adopted between the liquid cooling plate and the front plug and between the liquid cooling plate and the rear side plate.

Claims (10)

1. The utility model provides a battery box, include liquid cooling board and respectively with liquid cooling board welded fastening's left side board, the right side board, preceding curb plate and posterior lateral plate, the liquid cooling board includes the preceding end cap of bottom plate and welded fastening in the bottom plate front side, be provided with the runner that supplies the coolant liquid circulation in the bottom plate, both ends are provided with the runner groove with the runner intercommunication in the bottom plate respectively about in the preceding end cap, one in two runner grooves supplies outside coolant liquid to flow into the bottom plate, another supplies the coolant liquid outflow liquid cooling board in the bottom plate, be provided with the intercommunication mouth that is linked together with the runner in the bottom plate on the side of at least one runner groove and bottom plate combination position, its characterized in that: the connecting port is provided with a plug block for plugging the connecting port, the plug block is provided with an extending part extending into the connecting port and an extending part located outside the connecting port, a set distance is reserved between the upper surface of the extending part and the upper surface of the liquid cooling plate, and/or a set distance is reserved between the lower surface of the extending part and the lower surface of the liquid cooling plate, the peripheral side surface of the extending part and the side surface of the liquid cooling plate are welded and fixed through arc welding to form a circle of plug block welding line and seal the connecting port, the left side plate and/or the right side plate are/is provided with an avoiding groove for avoiding the extending part and the plug block welding line, the liquid cooling plate and the left side plate and/or the right side plate are welded and fixed through friction stir welding, the thickness of the plug block welding line in the vertical direction is larger than the height of a stirring head of the friction stir welding to prevent the plug block welding line from being completely, the width of the chock weld seam in the left-right direction is smaller than the width of the friction stir welding weld seam, so that the friction stir welding weld seam can cover the chock weld seam and the edges of the liquid cooling plate and the left side plate or the right side plate.
2. The battery case according to claim 1, characterized in that: the extending part of the plug block is provided with a stop edge matched with the side surface of the liquid cooling plate in a stop way.
3. The battery case according to claim 2, characterized in that: the shape of the chock is T-shaped, two stopping edges are arranged and are respectively positioned at the front end and the rear end of the extending part, and the upper surface and the lower surface of the extending part are respectively flush with the upper surface and the lower surface of the extending part.
4. The battery box body according to any one of claims 1 to 3, characterized in that: the end of the extending part is provided with a guide inclined plane which is convenient for the chock to be plugged into the communicating port.
5. The battery box body according to any one of claims 1 to 3, characterized in that: the left end and the right end of the rear portion of the bottom plate are respectively provided with a chamfer, a chamfer groove is formed between the chamfer and the rear side plate in a surrounding mode, the chamfer and the rear side plate are fixed through arc welding to form a fillet weld in the chamfer groove, the length of the fillet weld in the up-down direction is larger than the height of a stirring head of the friction stir welding, and therefore the fillet weld is prevented from being completely damaged by the stirring head of the friction stir welding.
6. A manufacturing method of a battery box body is characterized by comprising the steps of welding and fixing a bottom plate and a front plug to form a liquid cooling plate, and then plugging a plug block into a communication port left in the side face of the liquid cooling plate before the liquid cooling plate is welded with a left side plate and/or a right side plate, so that one part of the plug block extends into the communication port to form an extending part, the rest part of the plug block is positioned outside the communication port to form an extending part, meanwhile, a set distance is formed between the upper surface of the extending part and the upper surface of the liquid cooling plate, and/or a set distance is formed between the lower surface of the extending part and the lower surface of the liquid cooling plate; then, welding and fixing the peripheral side surface of the extending part and the side surface of the liquid cooling plate by arc welding to form a circle of chock welding seams to seal the communication port, and correspondingly machining avoidance grooves which avoid the extending part and the chock welding seams on the left side plate and/or the right side plate in advance; then respectively aligning the left side plate and the right side plate with the liquid cooling plate, welding and fixing the liquid cooling plate with the left side plate and the right side plate by friction stir welding, and controlling the thickness of the plug welding line in the vertical direction to enable the thickness of the plug welding line to be larger than the height of a stirring head of the friction stir welding, so that the plug welding line is prevented from being completely damaged by the stirring head of the friction stir welding; meanwhile, the width of the chock welding seam in the left and right directions is controlled to be smaller than the width of the friction stir welding seam, so that the friction stir welding seam can cover the chock welding seam and the edges of the liquid cooling plate and the left side plate or the right side plate.
7. The method for manufacturing a battery case according to claim 6, wherein a stopper edge for stopper-fitting to the side face of the liquid cooling plate is provided on the protruding portion of the stopper to control the degree of insertion of the stopper when the stopper is manufactured.
8. The battery case manufacturing method according to claim 7, wherein the stopper is manufactured by forming the stopper in a T-shape so that the stopper edges are located at the front and rear ends of the protruding portion and the upper and lower surfaces of the protruding portion are flush with the upper and lower surfaces of the protruding portion, respectively, thereby leaving a sufficient stopper weld forming space between the upper and lower surfaces of the protruding portion and the side surface of the liquid cooling plate.
9. The method for manufacturing a battery case according to any one of claims 6 to 8, wherein a guide slope for facilitating insertion of the plug into the communication port is formed at an end of the protruding portion when the plug is manufactured.
10. The method for manufacturing a battery case according to any one of claims 6 to 8, wherein before the liquid-cooled plate is welded to the left and right side plates, the bottom plate is welded to the rear side plate, and chamfers are formed at the left and right ends of the rear portion of the bottom plate in advance so as to define a fillet groove between the chamfers and the rear side plate, and then the chamfers and the rear side plate are welded by arc welding so as to form a fillet weld in the fillet groove, and the length of the fillet weld in the up-down direction is controlled so as to be greater than the height of the stirring head of the friction stir welding so as to prevent the fillet weld from being completely broken by the stirring head of the friction stir welding.
CN201910458384.4A 2019-05-29 2019-05-29 Battery box and manufacturing method thereof Pending CN112008271A (en)

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CN201910458384.4A CN112008271A (en) 2019-05-29 2019-05-29 Battery box and manufacturing method thereof

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CN112008271A true CN112008271A (en) 2020-12-01

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114792864A (en) * 2022-05-31 2022-07-26 东风汽车集团股份有限公司 Lower box structure of battery pack
WO2023097956A1 (en) * 2021-12-03 2023-06-08 上海治臻新能源股份有限公司 Cavity opening blocking type plug structure for adjusting flow of coolant

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023097956A1 (en) * 2021-12-03 2023-06-08 上海治臻新能源股份有限公司 Cavity opening blocking type plug structure for adjusting flow of coolant
CN114792864A (en) * 2022-05-31 2022-07-26 东风汽车集团股份有限公司 Lower box structure of battery pack

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