Power battery cooling plate and manufacturing method thereof
The S-shaped mouthpiece pipe design with integrated flow channels addresses inefficiencies in liquid-cooled battery packs by enhancing cooling efficiency, reducing leakage risk, and lowering costs through optimized structural design and component reduction.
Patent Information
- Application Number
- CN202510269912.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2025-07-15
AI Technical Summary
The existing large-surface cooling liquid-cooled plates have a large number of cold plate parts in the battery pack, occupying a large space, increasing valve parts for connecting pipes, high risk of liquid leakage, and lack of cooling efficiency during high-speed charging and discharge, high energy consumption, and excessive cost per unit battery pack.
The S-shaped harmonica tube design is adopted, with multiple runners and hollow parts at intervals. Through welding of welding sheets and current collectors, the efficient cooling of multiple sets of battery cells is achieved, and the welding quality and strength are ensured through high-frequency welding, reducing leakage risk.
It improves the cooling efficiency of the battery pack, reduces the space occupied, reduces the risk of liquid leakage, reduces the cost of unit battery packs, and improves the cooling effect and assembly strength of the battery cell.
Smart Images
Figure CN120319956A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of battery cooling plates for new energy vehicles, and in particular to a power battery cooling plate and a manufacturing method thereof. Background Art
[0002] Liquid cooling technology uses liquid as a heat dissipation medium, which has a higher thermal conductivity and heat capacity than air, and can more effectively absorb and remove the heat generated by the battery. On this basis, the large-surface cooling liquid cold plate further increases the contact area with the battery, improves the heat dissipation efficiency, and can achieve more precise temperature control to avoid excessive temperature differences in the battery pack.
[0003] However, the large-surface cooling products on the market currently have the following pain points: cold plates need to be arranged between each group of battery cells, the number of cold plate parts in the battery pack is large, and the corresponding number of connecting pipes and valves increases, resulting in more space occupied in the pack and increased risk of leakage. Currently, single cold plates are limited by the complex design of the flow channel, and the battery cell cooling efficiency is insufficient and the energy consumption is high when facing high-fold charging and discharging. The cost per battery pack is too high. Therefore, it is very necessary to solve the above problems. Summary of the invention
[0004] In view of this, an object of the present invention is to provide a power battery cooling plate and a manufacturing method thereof, which solve the problems arising in the background technology.
[0005] Based on the above purpose, the present invention provides a power battery cooling plate, comprising a harmonica tube, wherein the harmonica tube is in a bent S shape, and the head and tail ends of the harmonica tube are welded to the current collector through welding pieces; The harmonica tube comprises a plurality of parallel horizontal parts, two adjacent horizontal parts are connected together by a bending part and a vertical part so that the whole is S-shaped, and a battery core is closely arranged between two adjacent horizontal parts; The harmonica tube is provided with flow channel 1, flow channel 2 and flow channel 3 in sequence from the upper guide, and flow channel 1, flow channel 2 and flow channel 3 are arranged at intervals and not close to each other; The welding piece matches the cross section of the harmonica tube and is in a ring shape, and is used for inserting the head and tail ends of the harmonica tube. One end of the welding piece is provided with a flange inwardly for limiting the position of the harmonica tube after insertion. The current collector includes a main body that matches the shape of the welding piece, and the front and rear ends of the main body are connected with a coolant inlet and outlet. A groove that matches the shape of the welding piece is opened on the side of the main body, and three coolant branch ports connected to the main body are opened in the groove. The three coolant branch ports are matched and docked with flow channel one, flow channel two and flow channel three respectively.
[0006] Preferably, the battery cell does not contact the bent portion and the vertical portion, and a gap is left between the battery cell and the bent portion and the vertical portion.
[0007] Preferably, there is a first hollow part between the first flow channel and the second flow channel, and a second hollow part between the second flow channel and the third flow channel.
[0008] Preferably, there are vertical ribs between the first flow channel and the first hollow part, between the first hollow part and the second flow channel, between the second flow channel and the second hollow part, and between the second hollow part and the third flow channel. There are four bosses corresponding to the positions of the four vertical ribs arranged inside the flanging of the solder tab. After the head and tail ends of the corrugated tube are inserted into the solder tab, the four vertical ribs are attached to the four bosses.
[0009] Preferably, grooves matching the shapes of the first flow channel, the second flow channel, and the third flow channel are arranged at the three coolant branch ports inside the notch, and the coolant branch ports are located inside the grooves.
[0010] Preferably, after the solder tab is inserted into the notch, the first flow channel, the second flow channel, and the third flow channel are docked with the three grooves.
[0011] A manufacturing method of a power battery cooling plate includes the following steps: Step 1, bend the corrugated tube into an S shape by a bending machine; Step 2, insert the head and tail ends of the corrugated tube into the solder tab, then insert the solder tab into the notch of the current collector, and pre-assemble the corrugated tube, the solder tab, and the current collector together; Step 3, heat and melt the solder tab by a high-frequency welder, and then let it stand and cool to obtain the power battery cooling plate.
[0012] Advantages of the present invention: The present invention cools the battery cells by providing an S-shaped harmonica tube. The battery cells are located between the horizontal portions of the harmonica tube. In this way, one harmonica tube can cover the sides of multiple groups of battery cells, and the two sides of multiple groups of battery cells can be cooled simultaneously. Adjacent horizontal portions are connected together through a bent portion and a vertical portion, and the bent portion and the vertical portion replace some pipelines inside the battery pack. There are three flow channels provided inside the harmonica tube, and the three flow channels are spaced apart. In this way, the multi-flow-channel arrangement has a good cooling effect, and there are hollow portions provided at the intervals. Vertical ribs are provided between the flow channels and the hollow portions. In this way, one harmonica tube has four vertical ribs, ensuring the strength of the harmonica tube and preventing it from being crushed. The head and tail ends of the harmonica tube are welded to the current collector through socketed solder pads. The solder pads have flanges for limiting the harmonica tube and improving the welding quality between the harmonica tube and the current collector, reducing the risk of leakage. The current collector has coolant branch ports that match the positions and numbers of the flow channels. Coolant is introduced through the coolant inlet and outlet of one current collector, and the coolant exits through the coolant inlet and outlet of the other current collector. In this way, circulating cooling is achieved. The solder pads are provided with four bosses that cooperate with the vertical ribs, thus supplementing the solder amount and increasing the assembly strength. The current collector is provided with notch openings for inserting the solder pads and the harmonica tube, thus ensuring the integrity of the welding. And grooves are provided at the three coolant branch ports for matching the three flow channels, thus increasing the accuracy of assembly limit. The inside of the current collector can partition the flow channels. First, the harmonica tube is bent, then the solder pads are inserted, and finally the solder pads are inserted into the current collector. The solder pads are heated and melted by high-frequency welding to weld the harmonica tube and the current collector together. Brief Description of the Drawings
[0013] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only those of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0014] Figure 1 is an exploded view of the present invention; Figure 2 is a schematic view of both ends of the harmonica tube of the present invention; Figure 3 is a schematic view of the solder pad of the present invention; Figure 4 is a schematic view of the current collector of the present invention.
[0015] The reference signs in the figures are: 1 - harmonica tube, 2 - solder tab, 3 - current collector, 4 - horizontal part, 5 - bent part, 6 - vertical part, 7 - battery cell, 8 - flow channel one, 9 - flow channel two, 10 - flow channel three, 11 - flanging, 12 - main body, 13 - coolant inlet and outlet, 14 - notch, 15 - coolant branch port, 16 - first hollow part, 17 - second hollow part, 18 - vertical rib, 19 - groove, 20 - boss. Detailed implementation manners
[0016] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following further details the present invention in combination with specific embodiments.
[0017] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those with ordinary skills in the field to which the present invention pertains. The "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. The terms such as "include" or "comprise" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connect" or "be connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.
[0018] As Figures 1 to 4As shown in the figure, a power battery cooling plate includes a corrugated tube 1. The corrugated tube 1 is bent in an S shape. The head and tail ends of the corrugated tube 1 are welded to a current collector 3 through welding pieces 2. The corrugated tube 1 includes a plurality of horizontally arranged horizontal parts 4. Adjacent two horizontal parts 4 are connected together through a bent part 5 and a vertical part 6 to form an S shape as a whole. A battery cell 7 is arranged between adjacent two horizontal parts 4 in a fitting manner. The battery cell 7 is not in contact with the bent part 5 and the vertical part 6, and there is a gap between the battery cell 7 and the bent part 5 and the vertical part 6. By setting the S-shaped corrugated tube 1 to cool the battery cell 7, the battery cell 7 is located between the horizontal parts 4 of the corrugated tube 1. In this way, one corrugated tube 1 can cover the sides of multiple groups of battery cells 7, and the two sides of multiple groups of battery cells 7 can be cooled simultaneously. The bent part 4 and the vertical part replace some pipelines inside the battery pack. There are a flow channel one 8, a flow channel two 9, and a flow channel three 10 arranged in sequence from top to bottom in the corrugated tube 1. The flow channel one 8, the flow channel two 9, and the flow channel three 10 are spaced from each other and not adjacent. There is a hollow part one 16 between the flow channel one 8 and the flow channel two 9, and a hollow part two 17 between the flow channel two 9 and the flow channel three 10. There are vertical ribs 18 between the flow channel one 8 and the hollow part one 16, between the hollow part one 16 and the flow channel two 9, between the flow channel two 9 and the hollow part two 17, and between the hollow part two 17 and the flow channel three 10. There are three flow channels arranged in the corrugated tube 1, and the three flow channels are spaced. In this way, the multi-flow channel setting has a good cooling effect, and there are hollow parts at the intervals. Vertical ribs 18 are arranged between the flow channels and the hollow parts. In this way, one corrugated tube 1 has four vertical ribs 18, which ensures the strength of the corrugated tube 1 and prevents crushing.
[0019] The welding piece 2 conforms to the cross-section of the corrugated tube 1 and is in a ring shape for the insertion of the head and tail ends of the corrugated tube 1. One end of the welding piece 2 is provided with an inwardly turned edge 11 for limiting the position after the corrugated tube 1 is inserted. There are four bosses 20 corresponding to the positions of the four vertical ribs 18 arranged inside the turned edge 11 of the welding piece 2. After the head and tail ends of the corrugated tube 1 are inserted into the welding piece 2, the four vertical ribs 18 are in contact with the four bosses 20. The welding piece 2 has a turned edge 11 for limiting the position of the corrugated tube 1 and improving the welding quality between the corrugated tube 2 and the current collector 3, reducing the leakage risk. The welding piece 11 is provided with four bosses 20 to cooperate with the vertical ribs 18. In this way, the amount of solder is supplemented and the assembly strength is increased.
[0020] The current collector 3 includes a main body 12 having the same shape as the anastomotic solder tab 2. Both the front and rear ends of the main body 12 are connected to a coolant inlet and outlet 13. A notch 14 having the same shape as the anastomotic solder tab 2 is formed on the side surface of the main body 12. Three coolant branch ports 15 communicating with the main body 12 are formed in the notch 14. The three coolant branch ports 15 are respectively in mating connection with the first flow channel 8, the second flow channel 9, and the third flow channel 10. The head and tail ends of the corrugated tube 1 are welded to the current collector 3 through the socket solder tab 2. The current collector 3 has coolant branch ports 15 matching the positions and numbers of the flow channels. Coolant enters through the coolant inlet and outlet 15 of one current collector 3, and exits through the coolant inlet and outlet 15 of the other current collector 3, thus realizing circulating cooling.
[0021] Grooves 19 having the same shapes as the first flow channel 8, the second flow channel 9, and the third flow channel 10 are provided at the three coolant branch ports 15 in the notch 14, and the coolant branch ports 15 are located in the grooves 19. After the solder tab 2 is inserted into the notch 14, the first flow channel 8, the second flow channel 9, and the third flow channel 10 are docked with the three grooves 19. The current collector 3 is provided with a notch 14 for inserting the solder tab 2 and the corrugated tube 1, which ensures the integrity of welding. Moreover, grooves 19 are provided at the three coolant branch ports 15 for matching the three flow channels, which improves the accuracy of assembly limit, and the flow channels can be separated within the current collector 3.
[0022] A manufacturing method of a power battery cooling plate: First, the corrugated tube 1 is bent into an S shape by a bending machine; then, both the head and tail ends of the corrugated tube 1 are inserted into the solder tab 2, and then the solder tab 2 is inserted into the notch 14 of the current collector 3 to pre-assemble the corrugated tube 1, the solder tab 2, and the current collector 3 together; finally, the solder tab is heated and melted by a high-frequency welding machine, and then left to stand and cool to obtain a cell large-surface cooling plate that improves the thermal management efficiency of the power battery.
[0023] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary, and is not intended to imply that the scope of the present invention is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity. Any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A power battery cooling plate, comprising a corrugated tube (1), characterized in that, The harmonica tube (1) is bent in an S shape, and the head and tail ends of the harmonica tube (1) are welded to the current collector (3) through the welding piece (2); The harmonica tube (1) includes a plurality of horizontally arranged horizontal parts (4), and two adjacent horizontal parts (4) are connected together by a bent part (5) and a vertical part (6) to form an S shape as a whole, and a battery cell (7) is arranged between two adjacent horizontal parts (4) in a fitting manner; A first flow channel (8), a second flow channel (9) and a third flow channel (10) are sequentially arranged in the harmonica tube (1) from top to bottom in a guiding manner, and the first flow channel (8), the second flow channel (9) and the third flow channel (10) are spaced from each other and not adjacent; The welding piece (2) conforms to the cross section of the harmonica tube (1) and is annular, and is used for the insertion of the head and tail ends of the harmonica tube (1). A flanging (11) is arranged inward at one end of the welding piece (2) for limiting after the insertion of the harmonica tube (1); The current collector (3) includes a main body (12) conforming to the shape of the welding piece (2). Coolant inlets and outlets (13) are communicated at both the front and rear ends of the main body (12). A notch (14) conforming to the shape of the welding piece (2) is formed on the side surface of the main body (12). Three coolant branch ports (15) communicated with the main body (12) are formed in the notch (14), and the three coolant branch ports (15) are respectively in matching butt joints with the first flow channel (8), the second flow channel (9) and the third flow channel (10).
2. The cooling plate for a power battery according to claim 1, wherein The battery cell (7) does not contact between the bent part (5) and the vertical part (6), and there is a gap between the battery cell (7) and the bent part (5) and the vertical part (6).
3. The cooling plate for a power battery according to claim 1, characterized in that, A first hollow part (16) is arranged between the first flow channel (8) and the second flow channel (9), and a second hollow part (17) is arranged between the second flow channel (9) and the third flow channel (10).
4. The cooling plate for a power battery according to claim 3, characterized in that, Vertical ribs (18) are arranged between the first flow channel (8) and the first hollow part (16), between the first hollow part (16) and the second flow channel (9), between the second flow channel (9) and the second hollow part (17), and between the second hollow part (17) and the third flow channel (10). Four bosses (20) corresponding to the positions of the four vertical ribs (18) are arranged in the flanging (11) of the welding piece (2). After the head and tail ends of the harmonica tube (1) are inserted into the welding piece (2), the four vertical ribs (18) are in contact with the four bosses (20).
5. The cooling plate for a power battery according to claim 1, wherein Grooves (19) conforming to the shapes of the first flow channel (8), the second flow channel (9) and the third flow channel (10) are arranged at the three coolant branch ports (15) in the notch (14), and the coolant branch ports (15) are located in the grooves (19).
6. The cooling plate for a power battery according to claim 5, wherein, After the welding piece (2) is inserted into the notch (14), the first flow channel (8), the second flow channel (9) and the third flow channel (10) are in butt joints with the three grooves (19).
7. A manufacturing method of the power battery cooling plate according to any one of claims 1-6, characterized in that, It includes the following steps: Step 1, bending the harmonica tube (1) into an S shape by a bending machine; Step 1, inserting the head and tail ends of the harmonica tube (1) into the welding piece (2), then inserting the welding piece (2) into the notch (14) of the current collector (3), and pre-assembling the harmonica tube (1), the welding piece (2) and the current collector (3) together; Step 3, heating and melting the welding piece by a high-frequency welding machine, and then standing still for cooling to obtain a power battery cooling plate.