Die-casting integrated battery box plate and manufacturing method thereof

Abstract

The invention discloses a die-casting integrated battery box plate and a manufacturing method, the die-casting integrated battery box plate comprises a box plate, the box plate is integrally formed by adopting a die-casting process, the top of the box plate is provided with a mounting groove with an open upper end, the mounting groove is used for placing a battery core body, the bottom of the box plate is provided with a cooling groove with an open lower end, and the bottom of the box plate is fixedly provided with a bottom plate; a closed space can be formed between the bottom plate and the cooling tank, and cooling liquid is injected into the closed space; parting strips are arranged in the cooling groove in an array mode, and a cooling channel is formed between any two adjacent parting strips; a water inlet and a water outlet are formed in one end of the cooling tank in the length direction, and cooling liquid flows into the cooling channel in the cooling tank through the water inlet and then can be discharged through the water outlet. The invention has the following beneficial effects: the processing of the box plate is more convenient and quicker through the die-casting integrated molding method, and compared with the traditional splicing and welding of two cooling plates, the integrated molding of the cooling groove ensures the formation of a closed space more easily, thereby avoiding the phenomenon of air leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of battery cases, and in particular to a die-cast integrated battery case plate and a manufacturing method thereof. Background Art

[0002] Power batteries are an important part of new energy vehicles, which can directly provide power for new energy vehicles. Power batteries will generate a lot of heat while providing power. If the heat is not discharged in time, it will affect the performance and service life of the battery, and even cause the battery to catch fire and cause casualties. Therefore, the battery box of the car is equipped with a cooling plate to ensure that the battery is in a reasonable temperature range.

[0003] In the prior art, liquid cooling plates are widely used due to their high cooling efficiency and unaffected by environmental factors. Liquid cooling plates mainly use the principle of heat transfer to take away the heat generated by the battery by flowing coolant inside the cooling plate. Currently, most liquid cooling plates on the market are made of two plates and side beams, which are then connected together through friction welding. This makes the overall manufacturing process of the liquid cooling plate very complicated, and the processed product may also have the risk of leakage. Summary of the invention

[0004] In view of this, one of the purposes of the present invention is to provide a die-cast integrated battery box plate, aiming to ensure product stability while reducing processing steps.

[0005] To achieve the above purpose, the technical solution of the present invention is as follows:

[0006] A die-cast integrated battery box plate, comprising a box plate, characterized in that: the box plate is integrally formed by a die-casting process, the top of the box plate has a mounting groove with an open upper end, the mounting groove is used to place the battery core, the bottom of the box plate has a cooling groove with an open lower end, the bottom of the box plate is fixedly installed with a bottom plate, a closed space can be formed between the bottom plate and the cooling groove, the closed space is used to inject coolant; the cooling groove is provided with partitions arranged in an array along its width direction, the partitions located on the symmetry axis of the cooling groove are wider than other partitions, and a cooling channel is formed between any two adjacent partitions; a water inlet and a water outlet are provided at one end of the cooling groove in the length direction, the coolant flows into the cooling channel in the cooling groove through the water inlet, and can be discharged through the water outlet.

[0007] By adopting the above structure, the processing of the box plate is more convenient and quicker through the die-casting one-piece molding method. Compared with the traditional splicing and welding of two cooling plates, the one-piece molding of the cooling groove can more easily ensure the formation of a closed space, thereby avoiding air leakage. The cooling channel formed between the partitions can increase the flow range of the coolant and ensure the cooling effect. The width of the partition on the symmetry axis is wider than that of other partitions, which can ensure that the overall structure of the box plate is more solid, thereby facilitating the box to carry the battery core without product deformation.

[0008] As a preference: limiting protrusions are symmetrically arranged on both sides of the box plate in the width direction, and the limiting protrusions are used to limit the upper cover of the battery box body. The above structure can facilitate the positioning of the upper cover of the battery box body.

[0009] Preferably, the limiting protrusion has a reference hole and a first mounting hole, and the reference hole and the first mounting hole are used to position and mount the box plate on the vehicle body. The above structure can facilitate the installation of the box plate on the vehicle body.

[0010] Preferably, the end of the partition bar near the water inlet and the water outlet is convex outwardly distributed; the end of the partition bar away from the water inlet and the water outlet is concave inwardly distributed. The above structure facilitates the coolant to flow into each cooling channel and also facilitates the coolant to be discharged from the water outlet.

[0011] Preferably, the box plate is provided with second mounting holes in an array around its circumferential edge, and the second mounting holes are used to insert screws to facilitate the installation of the battery box cover. The above structure can facilitate the installation of the battery box cover.

[0012] Preferably, the cross-sectional size of the bottom plate is adapted to the cross-sectional size of the cooling groove, and the bottom plate is fixed to the edge of the cooling groove by friction welding. The above structure can make the overall structure more compact.

[0013] Preferably, two cross beams are arranged in parallel in the installation groove, and the tops of the cross beams are used to fix the battery expansion beam. The above structure can facilitate the installation of the expansion beam, thereby preventing the battery from being expanded and squeezed by heat and affecting its service life.

[0014] A second object of the present invention is to provide a method for manufacturing the die-cast integrated battery box plate as described in any one of the above items.

[0015] A method for manufacturing the die-cast integrated battery box plate as described in any one of the above, characterized in that it comprises the following steps:

[0016] Step 1: preparing a die-casting mold and metal raw materials for processing the box plate;

[0017] Step 2: Melting the metal raw material in step 1 into liquid state;

[0018] Step 3: injecting the liquid metal raw material in step 2 into the mold using a die-casting machine;

[0019] Step 4: After the liquid metal raw material is cooled, demoulding is performed to obtain the box plate;

[0020] Step 5: Grind and trim the entire box board described in step 4;

[0021] Step 6: cutting the bottom plate to be adapted to the bottom cross-section of the cooling trough;

[0022] Step 7: Clamp the box plate and the bottom plate onto the friction welding fixture in sequence, and weld the edge of the bottom plate to the circumferential edge of the cooling groove by friction welding technology;

[0023] Step 8: Grind the friction welding bead;

[0024] Step 9: Connect the water inlet and outlet to the airtight device and ventilate the inside to complete the airtightness test;

[0025] Step 10: Spray PVC on the bottom of the die-cast integrated battery box panel that has passed the airtightness test;

[0026] Step 11: After the PVC is dried, the die-cast integrated battery box panels are packaged and stored.

[0027] By adopting the above steps, the box plate can be processed more conveniently and quickly without additional hole drilling. The cooling groove is formed in one piece. Compared with the traditional splicing and welding of two cooling plates, the overall airtightness can be guaranteed.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The die-cast integrated battery case plate and manufacturing method provided by the present invention greatly simplify the production process of the case plate through the die-casting process. The cooling groove is integrally formed through the die-casting process. Compared with the traditional method of assembling and welding two cooling plates, it can better ensure air tightness. The cooling channel formed between the partitions can increase the flow range of the coolant and ensure the cooling effect. The width of the partition on the symmetry axis is wider than that of other partitions, which can ensure that the overall structure of the case plate is more solid, thereby facilitating the case to carry the battery core without product deformation.

[0030] 2. Various holes can be formed through the die-casting process without additional hole opening processing, and the design of each hole is convenient for the installation of the box board. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1It is a schematic diagram of the exploded structure of the die-cast integrated battery box plate;

[0032] Figure 2 It is a structural schematic diagram of the box plate 1 (top view);

[0033] Figure 3 It is a structural schematic diagram of the box board 1 (looking up);

[0034] Figure 4 This is a schematic diagram of the structure of the die-cast integrated battery box plate (looking from above). DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with embodiments and drawings.

[0036] Embodiment 1:

[0037] like Figures 1 to 4 As shown, a die-cast integrated battery box plate comprises a box plate 1, which is integrally formed by a die-casting process, a mounting groove 1e with an open upper end is formed on the top of the box plate 1, and the mounting groove 1e is used to place the battery core, and a cooling groove 1a with an open lower end is provided at the bottom of the box plate 1, and a bottom plate 2 is fixedly installed at the bottom of the box plate 1, and a closed space can be formed between the bottom plate 2 and the cooling groove 1a, and the closed space is used to inject coolant, and partition bars 1c distributed in an array along the width direction of the cooling groove 1a are formed inside the cooling groove 1a, and the partition bars 1c located on the symmetry axis of the cooling groove 1a are wider than other partition bars 1c, and a cooling channel 1d is formed between any adjacent partition bars 1c, and a water inlet 1g and a water outlet 1h are also formed at one end of the cooling groove 1a in the length direction, and the coolant flows into the cooling channel 1d in the cooling groove 1a through the water inlet 1g, and can be discharged through the water outlet 1h.

[0038] The die-casting process makes the processing of the box plate 1 more convenient and quick. The cooling groove 1a is directly integrally formed. Compared with the traditional form of two cooling plates spliced ​​and welded, the integrally formed cooling groove 1a has better airtightness and is more stable. The cooling channel 1d formed between the partitions 1c increases the flow distance of the coolant inside the cooling groove 1a, thereby increasing the heat absorption effect of the coolant. The formed water inlet 1g and water outlet 1h ensure that the coolant can circulate, thereby facilitating the removal of the absorbed heat. The partition 1c located on the symmetry axis of the cooling groove 1a is wider than any other partition 1c, which increases the structural strength of the entire box plate 1, thereby facilitating the box plate 1 to carry the battery core without product deformation.

[0039] like Figure 2 As shown, limiting protrusions 1b are symmetrically arranged on both sides of the box plate 1 in the width direction. In this embodiment, there are three limiting protrusions 1b on each side. The limiting protrusions 1b can limit the installation position of the upper cover of the battery box, thereby facilitating the rapid positioning of the upper cover of the battery box.

[0040] Furthermore, each limiting protrusion 1b is formed with a reference hole 1b1 and a first mounting hole 1b2, wherein the reference hole 1b1 facilitates the positioning of the box panel 1 on the vehicle body, and bolts can be passed through the first mounting hole 1b2 to fix the box panel 1 on the vehicle body.

[0041] like Figure 2 As shown, second mounting holes 1f are evenly distributed on the circumferential edge of the box plate 1 , and screws can be inserted into the second mounting holes 1f so that the battery box cover is fixedly mounted on the top of the box plate 1 .

[0042] In this embodiment, the cross-sectional dimensions of the bottom plate 2 are adapted to the cross-sectional dimensions of the cooling groove 1a, and the circumferential edges of the bottom plate 2 and the cooling groove 1a are fixedly mounted by friction welding. Such a design can make the assembly between the box plate 1 and the bottom plate 2 more compact, and the use of friction welding also ensures the airtightness of the cooling groove 1a, thereby preventing leakage of the coolant.

[0043] like Figure 3 As shown, the end of the partition bar 1c close to the water inlet 1g and the water outlet 1h is convex outwardly distributed, and the end of the partition bar 1c away from the water inlet 1g and the water outlet 1h is concave inwardly distributed. That is, the closer the end of the partition bar 1c close to the water inlet 1g and the water outlet 1h is to the water inlet 1g and the water outlet 1h in the width direction, the farther it is from the water inlet 1g and the water outlet 1h in the length direction, and the closer the end of the partition bar 1c away from the water inlet 1g and the water outlet 1h is to the water inlet 1g and the water outlet 1h in the width direction, the farther it is from the water inlet 1g and the water outlet 1h in the length direction. Such a design can facilitate the coolant to flow from the water inlet 1g into each cooling channel 1d, and also facilitate the coolant to be discharged from the water outlet 1h.

[0044] like Figure 2 As shown, two beams 1i are placed in parallel in the installation groove 1e, and the tops of the two beams 1i are used to fix the battery expansion beam. Such a design can prevent the battery from expanding and squeezing due to heat and affecting its normal service life. In this embodiment, the tops of the two beams 1i are formed with positioning and mounting holes 1i1, and the positioning and mounting holes 1i1 can facilitate the positioning and installation of the battery expansion beam. In addition, a mounting bracket 1j is provided between one of the beams 1i and one side of the box plate 1, and the mounting bracket 1j can be used to fix the battery management system.

[0045] Embodiment 2:

[0046] A method for manufacturing the die-cast integrated battery box plate of embodiment 1 comprises the following steps:

[0047] Step 1: Prepare a die-casting mold and metal raw materials for processing the box plate 1. In this embodiment, aluminum is preferably used as the processing raw material for the box plate 1.

[0048] Step 2: Heat and melt the aluminum metal into liquid state.

[0049] Step 3: Inject liquid aluminum into the mold using a die-casting machine.

[0050] Step 4: After the liquid aluminum cools and solidifies, demoulding is performed to obtain the desired box plate 1.

[0051] Step 5: Grind and trim the demoulded box board 1.

[0052] Step 6: Cut the bottom plate 2 to be compatible with the bottom cross-section of the cooling groove 1a. In this embodiment, the bottom plate 2 is also preferably made of aluminum as its raw material.

[0053] Step 7: Clamp the box plate 1 polished and trimmed in step 5 and the bottom plate 2 cut out in step 6 onto the friction welding fixture respectively, and weld the edge of the bottom plate 2 to the circumferential edge of the cooling groove 1a by friction welding technology.

[0054] Step 8: Grind the friction welding bead from step 7.

[0055] Step 9: Connect the water inlet 1g and the water outlet 1h to the airtight equipment and ventilate the cooling tank 1a to complete the airtightness test. In this embodiment, the air pressure range of the gas introduced into the cooling tank 1a through the airtight equipment is 300±5KPA, and the detection time is 180s. When the measured leakage value data is less than or equal to 70Pa, it means that the airtightness of the die-cast integrated battery box plate is qualified.

[0056] Step 10: Spray PVC on the bottom of the die-cast integrated battery box plate that has passed the airtightness test. In this embodiment, spraying PVC can play an anti-collision function.

[0057] Step 11: After the PVC is dried, pack the die-cast integrated battery box panels and store them in the warehouse.

[0058] Based on the above steps, the box plate 1 can be easily obtained only through the die-casting process without additional hole opening. The cooling groove 1a is integrally formed through the die-casting process. Compared with the traditional splicing and welding of two cooling plates, the airtightness of the cooling groove 1a is more stable and easier to achieve.

[0059] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention, and such changes all fall within the scope of protection of the present invention.

Claims

1. A die-cast integrated battery box plate, comprising a box plate (1), characterized in that: The box plate (1) is integrally formed by a die-casting process, the top of the box plate (1) is provided with a mounting groove (1e) with an open upper end, the mounting groove (1e) is used to place the battery core, the bottom of the box plate (1) is provided with a cooling groove (1a) with an open lower end, the bottom of the box plate (1) is fixedly provided with a bottom plate (2), a closed space can be formed between the bottom plate (2) and the cooling groove (1a), and the closed space is used to inject a coolant; The cooling groove (1a) is provided with partition bars (1c) arranged in an array along its width direction, the partition bars (1c) located on the symmetry axis of the cooling groove (1a) are wider than the other partition bars (1c), and a cooling channel (1d) is formed between any two adjacent partition bars (1c); A water inlet (1g) and a water outlet (1h) are provided at one end of the cooling groove (1a) in the length direction; the coolant flows into the cooling channel (1d) in the cooling groove (1a) through the water inlet (1g) and can then be discharged through the water outlet (1h).

2. The die-cast integrated battery box plate according to claim 1, characterized in that: Limiting protrusions (1b) are symmetrically provided on both sides of the box plate (1) in the width direction, and the limiting protrusions (1b) are used to limit the upper cover of the battery box body.

3. The die-cast integrated battery box plate according to claim 2, characterized in that: The limiting protrusion (1b) is provided with a reference hole (1b1) and a first mounting hole (1b2), and the reference hole (1b1) and the first mounting hole (1b2) are used to position and mount the box plate (1) on the vehicle body.

4. The die-cast integrated battery box plate according to claim 1, characterized in that: One end of the partition bar (1c) close to the water inlet (1g) and the water outlet (1h) is distributed in an outwardly convex manner; One end of the partition bar (1c) away from the water inlet (1g) and the water outlet (1h) is distributed in an inwardly concave manner.

5. The die-cast integrated battery box plate according to claim 1, characterized in that: The box plate (1) is provided with second mounting holes (1f) arranged in an array along the circumferential edge thereof, wherein the second mounting holes (1f) are used for inserting screws to facilitate the installation of the upper cover of the battery box.

6. The die-cast integrated battery box plate according to claim 1, characterized in that: The cross-sectional dimensions of the bottom plate (2) are adapted to the cross-sectional dimensions of the cooling groove (1a), and the bottom plate (2) and the edges of the cooling groove (1a) are fixed by friction welding.

7. The die-cast integrated battery box plate according to claim 1, characterized in that: Two cross beams (1i) are arranged in parallel in the installation groove (1e), and the tops of the cross beams (1i) are used for fixing and installing battery expansion beams.

8. A method for manufacturing the die-cast integrated battery box plate according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: preparing a die-casting mold and metal raw materials for processing the box plate (1); Step 2: Melting the metal raw material in step 1 into liquid state; Step 3: injecting the liquid metal raw material in step 2 into the mold using a die-casting machine; Step 4: After the liquid metal raw material is cooled, demoulding is performed to obtain the box plate (1); Step 5: Grinding and trimming the entire box board (1) described in step 4; Step 6: cutting the bottom plate (2) to be compatible with the bottom cross-section of the cooling trough (1a); Step 7: Clamp the box plate (1) and the bottom plate (2) onto a friction welding fixture in sequence, and weld the edge of the bottom plate (2) to the circumferential edge of the cooling groove (1a) by means of friction welding technology; Step 8: Grind the friction welding bead; Step nine: Connect the water inlet (1g) and the water outlet (1h) to airtight equipment and ventilate the inside to complete the airtightness test; Step 10: Spray PVC on the bottom of the die-cast integrated battery box panel that has passed the airtightness test; Step 11: After the PVC is dried, the die-cast integrated battery box panels are packaged and stored.

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