CN223006842U - Liquid cooling plate and blade battery - Google Patents
Liquid cooling plate and blade battery Download PDFInfo
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- CN223006842U CN223006842U CN202421958969.5U CN202421958969U CN223006842U CN 223006842 U CN223006842 U CN 223006842U CN 202421958969 U CN202421958969 U CN 202421958969U CN 223006842 U CN223006842 U CN 223006842U
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Abstract
本申请涉及电池技术领域，特别涉及一种液冷板及刀片电池。沿第一方向，该液冷板依次包括第一端部、中间部分和第二端部；该液冷板包括液冷流道，液冷流道包括进水流道和与进水流道连通的出水流道，进水流道设于第一端部和/或第二端部，出水流道设于中间部分。液冷流道中的冷却液优先经过第一端部和第二端部，可以更好地带走刀片电池的两个端部的热量，经过第一端部和第二端部之后的冷却液通过出水流道时，冷却液的温度逐渐升高，从而使刀片电池的中间区域的散热效率下降，进而使刀片电池的两端的温度和中间区域的温度更加均衡。
The present application relates to the field of battery technology, and in particular to a liquid cooling plate and a blade battery. Along a first direction, the liquid cooling plate includes a first end, a middle part, and a second end in sequence; the liquid cooling plate includes a liquid cooling channel, and the liquid cooling channel includes an inlet channel and an outlet channel connected to the inlet channel, the inlet channel is arranged at the first end and/or the second end, and the outlet channel is arranged at the middle part. The coolant in the liquid cooling channel passes through the first end and the second end first, which can better take away the heat from the two ends of the blade battery. When the coolant passes through the first end and the second end and passes through the outlet channel, the temperature of the coolant gradually increases, thereby reducing the heat dissipation efficiency of the middle area of the blade battery, thereby making the temperature at both ends of the blade battery and the temperature in the middle area more balanced.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a liquid cooling plate and a blade battery.
Background
The structure of the blade battery is similar to a flat strip shape, and the structure makes heat generated by the blade battery during charge and discharge easily gather at both ends of the blade battery. Specifically, when the battery is charged and discharged, current flows inside the battery, and more heat is generated where the current concentrates due to the presence of the resistor. However, the flat structure of the blade cell makes it easier for current to collect at both ends, and thus, the temperature at both ends of the blade cell may be relatively high and the temperature at the middle region of the blade cell may be relatively low. The existing liquid cooling plate structure cannot be matched with the heating characteristics of the existing liquid cooling plate structure, so that the overall temperature difference of the blade battery is large, and the power performance of the battery is affected.
Disclosure of utility model
The application discloses a liquid cooling plate and a blade battery, which are used for solving the problem that the temperature difference of the whole blade battery is large because the related liquid cooling plate cannot be matched with the heating characteristic of the blade battery.
In order to achieve the above purpose, the present application provides the following technical solutions:
The application provides a liquid cooling plate which sequentially comprises a first end part, a middle part and a second end part along a first direction, wherein the liquid cooling plate comprises a liquid cooling runner, the liquid cooling runner comprises a water inlet runner and a water outlet runner communicated with the water inlet runner, the water inlet runner is arranged at the first end part and/or the second end part, and the water outlet runner is arranged at the middle part.
When the blade battery works, the temperatures of the two ends of the blade battery are relatively high, the temperature of the middle area is relatively low, the first end part and the second end part of the liquid cooling plate respectively correspond to the two ends of the blade battery, and the middle part of the liquid cooling plate corresponds to the middle area of the blade battery. When the liquid cooling channel comprises two water inlet channels, the first end part and the second end part are both provided with the water inlet channels. The middle part is located to the play water runner, therefore, the coolant liquid in the liquid cooling runner is preferential through first tip and second tip, can take away the heat of two tip of blade battery better, and when the coolant liquid behind first tip and second tip passed through the play water runner, the temperature of coolant liquid risees gradually to make the heat dissipation efficiency in the middle zone of blade battery drop, and then make the temperature at the both ends of blade battery and the temperature in middle zone more balanced.
Further, the water inlet flow channel comprises a first water inlet flow channel and a second water inlet flow channel, the first water inlet flow channel is arranged at the first end part, and the second water inlet flow channel is arranged at the second end part.
Further, the liquid cooling plate further comprises a liquid inlet and a liquid outlet, the liquid inlet comprises a first water inlet and a second water inlet, the first water inlet is communicated with the first water inlet flow channel, the second water inlet is communicated with the second water inlet flow channel, the liquid outlet is communicated with the water outlet flow channel, and the sum of the areas of the first water inlet and the second water inlet is equal to the area of the liquid outlet.
Further, the liquid cooling runner also comprises an intermediate runner, the water inlet runner and the water outlet runner are communicated through the intermediate runner, one of the first end part and the second end part is provided with the water inlet runner, and the other is provided with the intermediate runner.
Further, the liquid cooling flow channel of the first end part and/or the second end part is internally provided with radiating fins, and/or the water outlet flow channel is internally provided with a flow dividing strip.
Further, along the second direction, the liquid cooling plate comprises at least two liquid cooling areas, the at least two liquid cooling areas share the same water inlet flow channel and the water outlet flow channel, and a turbulence column is arranged between the two adjacent liquid cooling areas, wherein the second direction is perpendicular to the first direction.
The water inlet flow channel is internally provided with a plurality of heat dissipation fins which are arranged along a first direction, the heat dissipation fins extend along a second direction, the liquid cooling areas at two ends of the liquid cooling plate are end areas along the second direction, the liquid cooling areas between the two end areas are central areas, and the distance between two adjacent heat dissipation fins in the central area is smaller than the distance between two adjacent heat dissipation fins in the end areas along the first direction.
Further, the water inlet flow channel and the water outlet flow channel extend along a second direction, and the second direction is perpendicular to the first direction.
In a second aspect, the present application provides a blade battery, where the blade battery includes a plurality of unit batteries and the liquid cooling plate of the first aspect, the arrangement direction of the plurality of unit batteries is a second direction, the second direction is perpendicular to the first direction, and the liquid cooling plate is located on the surfaces of the plurality of unit batteries.
Because the liquid cooling plate comprises the liquid cooling plate in the first aspect of the application, the temperature of the whole blade battery is more balanced, and the performance is improved.
Further, the blade battery still includes two at least battery module, and battery module includes a plurality of battery cells, along the second direction, and the liquid cooling board includes two at least liquid cooling regions, and liquid cooling region and battery module one-to-one.
Drawings
FIG. 1 is a schematic diagram of a liquid cooling plate according to an embodiment of the present application;
FIG. 2 is a schematic view of a substrate according to an embodiment of the application;
FIG. 3 is a schematic diagram of a liquid cooling plate according to another embodiment of the present application;
fig. 4 is a schematic view of a blade battery according to an embodiment of the present application.
The reference numerals comprise 100-base plates, 110-first end parts, 120-middle parts, 130-second end parts, 200-cover plates, 300-liquid cooling flow channels, 310-water inlet flow channels, 310 a-first water inlet flow channels, 310 b-second water inlet flow channels, 320-water outlet flow channels, 330-middle flow channels, 400-heat radiating fins, 500-flow dividing strips, 600-turbulent flow columns, 700-water inlet pipelines, 800-water outlet pipelines, 900-battery modules and 910-single batteries;
10-liquid cooled zone, 10 a-end zone, 10 b-central zone;
01-accommodating cavity, 02-liquid inlet, 02 a-first water inlet, 02 b-second water inlet and 03-liquid outlet.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The blade battery is operated with the end portions at a relatively high temperature and the middle region at a relatively low temperature. The liquid cooling plate structure of the existing battery cannot be matched with the heating characteristic of the existing battery, so that the overall temperature difference of the blade battery is large, and the power performance of the battery is affected.
In view of the foregoing, in the embodiment of the present application, a liquid cooling plate is provided, fig. 1 is a schematic structural diagram of the liquid cooling plate according to an embodiment of the present application, fig. 2 is a schematic structural diagram of a substrate according to an embodiment of the present application, and referring to fig. 1 and 2, the liquid cooling plate sequentially includes a first end portion 110, a middle portion 120 and a second end portion 130 along a first direction D1. The first direction is a length direction of the blade battery unit, that is, the first end 110 and the second end 130 of the liquid cooling plate respectively correspond to two ends of the blade battery unit, where the temperature of the blade battery unit is relatively high, and the middle portion 120 of the liquid cooling plate corresponds to a middle region of the blade battery unit, where the temperature of the blade battery unit is relatively low. The liquid cooling plate comprises a base plate 100 and a cover plate 200, wherein a closed accommodating cavity 01 is formed by surrounding the base plate 100 and the cover plate 200. The accommodating cavity 01 is provided with cooling liquid, and the cooling liquid can be cooling water or other fluid, such as 50% glycol mixed solution.
With continued reference to fig. 1 and 2, the liquid cooling plate includes a liquid cooling flow channel 300, the liquid cooling flow channel 300 includes a water inlet flow channel 310 and a water outlet flow channel 320 communicating with the water inlet flow channel 310, the water inlet flow channel 310 is provided at the first end 110 and/or the second end 130, the temperature of the cooling liquid in the initial state is low, and the heat exchange efficiency between the cooling liquid in the water inlet flow channel 310 and the two ends of the blade battery is high. The outlet flow path 320 is provided in the middle portion 120, and when the cooling liquid flows from the inlet flow path 310 to the outlet flow path 320, the temperature of the cooling liquid gradually increases, and the efficiency of heat exchange between the cooling liquid in the outlet flow path 320 and the middle region of the blade battery gradually decreases. Therefore, the cooling liquid in the liquid cooling flow channel 300 preferentially passes through the first end 110 and the second end 130, so that heat of two ends of the blade battery can be better taken away, and when the cooling liquid after passing through the first end 110 and the second end 130 passes through the water outlet flow channel 320, the temperature of the cooling liquid gradually rises, so that the heat dissipation efficiency of the middle area of the blade battery is reduced, and the temperatures of two ends of the blade battery and the temperature of the middle area are more balanced.
It can be appreciated that the lengths of the water inlet channel 310 and the water outlet channel 320 are not limited in the present application, and are specifically designed according to the size of the blade battery and the actual temperatures of different areas of the blade battery, so that the structure of the liquid cooling plate can better match the cooling requirement of the blade battery.
With continued reference to fig. 1 and 2, the liquid cooling plate further includes a liquid inlet 02, a liquid outlet 03, a water inlet pipe 700, and a water outlet pipe 800. The liquid inlet 02 is arranged in the water inlet flow passage 310 and is communicated with the water inlet pipeline 700, and the liquid outlet 03 is arranged in the water outlet flow passage 320 and is communicated with the water outlet pipeline 800. The cooling liquid enters the water inlet flow channel 310 from the water inlet pipeline 700 through the liquid inlet 02, then flows from the water inlet flow channel 310 to the water outlet flow channel 320, and finally enters the water outlet pipeline 800 through the liquid outlet 03.
The number of the water inlet channels 310 is not limited in the present application, and the number of the water inlet channels 310 may be one, two or more. As shown in fig. 1, when the number of the water inlet channels 310 is two, that is, the water inlet channels 310 include a first water inlet channel 310a and a second water inlet channel 310b, the liquid inlet 02 includes a first water inlet 02a and a second water inlet 02b, the first water inlet channel 310a is provided at the first end 110, and the first water inlet 02a is provided at the first water inlet channel 310a. The second water inlet flow channel 310b is provided at the second end 130, and the second water inlet 02b is provided at the second water inlet flow channel 310b. The cooling liquid enters the first water inlet channel 310a from the first water inlet 02a, and then flows from the front end to the end of the first water inlet channel 310a to the water outlet channel 320. The cooling liquid enters the second water inlet channel 310b from the second water inlet 02b, and then flows from the front end to the end of the second water inlet channel 310b to the water outlet channel 320.
Fig. 3 is a schematic structural diagram of a liquid cooling plate according to another embodiment of the present application, referring to fig. 3, when the number of the water inlet channels 310 is one, the liquid cooling channels 300 further include an intermediate channel 330, and the water inlet channels 310 and the water outlet channels 320 are communicated through the intermediate channel 330. One of the first end 110 and the second end 130 is provided with a water inlet flow passage 310, and the other is provided with an intermediate flow passage 330. The cooling liquid enters the water inlet flow channel 310 from the liquid inlet 02, flows to the tail end of the water inlet flow channel 310, flows to the middle flow channel 330, and flows into the water outlet flow channel 320 after passing through the middle flow channel 330. The liquid cooling plate with the structure is only provided with one liquid inlet 02, so that the space can be saved relative to two or more liquid inlets 02, and the probability of interference between the liquid inlet 02 and other parts of the blade battery is reduced.
Alternatively, the water inlet flow channel 310 may be a linear flow channel extending along the second direction D2, and the path is shorter, so that the water inlet flow channel 310 has a smaller pressure drop. Wherein the second direction is perpendicular to the first direction. Similarly, the outlet flow channel 320 may be a linear flow channel extending along the second direction D2, and the path is shorter, so that the outlet flow channel 320 has a smaller pressure drop.
With continued reference to fig. 2, in the second direction, the first water inlet 02a is located at one end of the first end 110 of the liquid cooling plate, and the second water inlet 02b is located at one end of the second end 130 of the liquid cooling plate. The first water inlet 02a and the second water inlet 02b may be located at the same end of the liquid cooling plate in the second direction or may be located at different ends.
The sum of the areas of the first water inlet 02a and the second water inlet 02b is equal to the area of the liquid outlet 03, for example, the areas of the first water inlet 02a and the second water inlet 02b are both S, and then the area of the liquid outlet 03 is 2S, so that the pressure inside the liquid cooling plate is dynamically balanced when the liquid cooling plate works, and the heat dissipation effect and the stability of the system are improved.
The number of the water outlet channels 320 is not limited in the present application, and the number of the water outlet channels 320 may be one, two or more. As shown in fig. 2, the number of the water outlet channels 320 is one, and the cooling liquid in the first water inlet channel 310a and the second water inlet channel 310b is converged to the water outlet channel 320. Of course, the number of the water outlet channels 320 may be two, one of the two water outlet channels 320 is communicated with the first water inlet channel 310a, and the other of the two water outlet channels 320 is communicated with the second water inlet channel 310 b.
With continued reference to fig. 1 and 2, the heat dissipation fins 400 are disposed in the liquid cooling flow channel 300 of the first end 110, so as to improve the heat dissipation efficiency of the first end 110 of the liquid cooling plate to the end of the blade battery.
Optionally, a heat dissipation fin 400 is disposed in the liquid cooling channel 300 of the second end 130, so as to improve heat dissipation efficiency of the second end 130 of the liquid cooling plate to the end of the blade battery.
Referring to fig. 2, a diverting strip 500 is provided in the outlet flow path 320. The water outlet flow channel 320 is split under the action of the split flow strip 500 and forms a multi-stage parallel split flow channel, which is favorable for uniformity of flow distribution, and meanwhile, the fluid boundary layer is broken through multi-stage split flow, so that the heat exchange efficiency is improved, and the cooling effect is better. In addition, the flow dividing strip 500 helps to reduce the pressure loss inside the liquid cooling flow channel 300, thereby improving the overall performance of the liquid cooling plate. The number of the flow dividing strips 500 may be plural, and the flow dividing strips 500 may extend along the second direction.
Optionally, the heat dissipation fins 400 and the flow dividing strips 500 are parallel, so that the fluid in the water outlet flow channel 320 can be better matched with the flowing state of the fluid in the water inlet flow channel 310, and the fluid can be promoted to flow more uniformly.
With continued reference to fig. 2, in the second direction, the liquid cooling plate includes at least two liquid cooling regions 10, and the at least two liquid cooling regions 10 share the same water inlet channel 310 and water outlet channel 320. The turbulence columns 600 are disposed between two adjacent liquid cooling areas 10 in the water outlet flow channel 320, and the turbulence columns 600 can influence the flowing state of the cooling liquid in the water outlet flow channel 320, so as to destroy and reconstruct the boundary layer, and further improve the heat transfer performance of the liquid cooling plate.
The number of the turbulent flow columns 600 between two adjacent liquid cooling regions 10 may be plural, so as to improve the heat transfer performance of the liquid cooling plate.
Alternatively, the cross section of the spoiler column 600 may be circular, and the outer surface of the cylindrical spoiler column 600 is relatively smooth, so that the wall jet characteristics formed by the fluid can be well matched, and the liquid cooling plate has a good heat dissipation effect and a small pressure loss.
In some alternative embodiments, the spacing between two adjacent fins 400 within the same liquid cooled region 10 is equal. When the number of the liquid cooling areas 10 is plural, a plurality of heat dissipation fins 400 are disposed in the water inlet channel 310 and arranged along the first direction, and the heat dissipation fins 400 extend along the second direction. In the second direction, the liquid cooling regions 10 located at both ends of the liquid cooling plate are end regions 10a, and the liquid cooling region 10 between the two end regions 10a is a central region 10b. In the first direction, the spacing between two adjacent heat dissipating fins 400 in the central region 10b is smaller than the spacing between two adjacent heat dissipating fins 400 in the end region 10a, that is, the heat dissipating fins 400 in the central region 10b are denser, have a higher heat exchange coefficient, and thus have a better heat dissipating effect, and the pressure loss in the liquid cooling flow channel 300 is smaller.
In some alternative embodiments, the materials of the base plate 100, the cover plate 200 and the heat dissipation fins 400 may be all aluminum alloy, so that the liquid cooling plate has good heat conduction performance and small density, and the weight of the whole liquid cooling plate is reduced.
Based on the same technical concept, an embodiment of the present application further provides a blade battery, and fig. 4 is a schematic structural diagram of the blade battery according to an embodiment of the present application, and referring to fig. 4, the blade battery includes a plurality of unit batteries 910 and a liquid cooling plate in various possible embodiments of the present application, where an arrangement direction of the plurality of unit batteries 910 is a second direction D2, the second direction D2 is perpendicular to the first direction D1, and the liquid cooling plate is located on a surface of the plurality of unit batteries 910. Along the first direction, the first end 110 of the liquid cooling plate corresponds to one end of the unit battery 910, the second end 130 of the liquid cooling plate corresponds to the other end of the unit battery 910, and the middle portion 120 of the liquid cooling plate corresponds to the middle region of the unit battery 910. Because the liquid cooling plates are arranged in a partitioned manner, and the heat dissipation efficiency of the first end 110 and the second end 130 of the liquid cooling plates is higher than that of the middle part 120 of the liquid cooling plates, the efficiency of heat exchange between the two ends of the blade battery and the liquid cooling plates is higher than that of the middle region of the blade battery, so that the temperatures of the middle region and the ends of the blade battery are more balanced.
With continued reference to fig. 4, a plurality of blade cells may form a battery module 900, with at least two battery modules 900 aligned in a second direction. Along the second direction, the liquid cooling plate comprises at least two liquid cooling areas 10, and the liquid cooling areas 10 are in one-to-one correspondence with the battery modules 900.
In the second direction, the battery modules 900 are provided at both sides of the battery module 900 at the middle position, each battery module 900 corresponds to one heat source, and thus, the battery module 900 at the middle position has a worse heat dissipation environment. In order to make the temperatures of the plurality of battery modules 900 more uniform, the interval between two adjacent heat dissipation fins 400 in the central region 10b of the liquid cooling plate is smaller than the interval between two adjacent heat dissipation fins 400 in the end region 10a in the first direction, i.e., the heat dissipation fins 400 in the central region 10b are denser, so the central region 10b of the liquid cooling plate has a higher heat exchange coefficient, which has a higher efficiency of heat exchange with the corresponding battery modules 900, thereby making it possible to make the temperatures between the plurality of battery modules 900 more uniform.
It is understood that the central region 10b of the liquid cooling plate may include a plurality of liquid cooling regions 10, and the temperatures of the battery modules 900 corresponding to the liquid cooling regions 10 may be different, so that the interval between two adjacent heat dissipation fins 400 in the liquid cooling regions 10 may be set according to practical situations.
It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present application without departing from the spirit and scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The liquid cooling plate is characterized by comprising a first end part, a middle part and a second end part in sequence along a first direction, wherein the liquid cooling plate comprises a liquid cooling runner, the liquid cooling runner comprises a water inlet runner and a water outlet runner communicated with the water inlet runner, the water inlet runner is arranged at the first end part and/or the second end part, and the water outlet runner is arranged at the middle part.
2. The liquid cooling plate according to claim 1, wherein the water inlet flow passage comprises a first water inlet flow passage and a second water inlet flow passage, the first water inlet flow passage is provided at the first end portion, and the second water inlet flow passage is provided at the second end portion.
3. The liquid cooling plate according to claim 2, further comprising a liquid inlet and a liquid outlet, the liquid inlet comprising a first water inlet and a second water inlet, the first water inlet in communication with the first water inlet flow channel, the second water inlet in communication with the second water inlet flow channel, the liquid outlet in communication with the water outlet flow channel;
The sum of the areas of the first water inlet and the second water inlet is equal to the area of the liquid outlet.
4. The liquid cooling plate according to claim 1, wherein the liquid cooling flow passage further comprises an intermediate flow passage through which the water inlet flow passage and the water outlet flow passage communicate;
one of the first end and the second end is provided with the water inlet flow passage, and the other is provided with the middle flow passage.
5. The liquid cooling plate according to claim 1, wherein heat radiating fins are arranged in the liquid cooling flow channel of the first end portion and/or the second end portion, and/or a flow dividing strip is arranged in the water outlet flow channel.
6. The liquid cooling plate according to claim 1, wherein the liquid cooling plate comprises at least two liquid cooling areas along a second direction, the at least two liquid cooling areas share the same water inlet flow channel and the water outlet flow channel, and a turbulence column is arranged between two adjacent liquid cooling areas in the water outlet flow channel, wherein the second direction is perpendicular to the first direction.
7. The liquid cooling plate according to claim 6, wherein the number of the liquid cooling areas is plural, a plurality of heat dissipation fins arranged along the first direction are arranged in the water inlet flow channel, and the heat dissipation fins extend along the second direction;
The liquid cooling areas at two ends of the liquid cooling plate are end areas along the second direction, and the liquid cooling area between the two end areas is a central area;
In the first direction, a spacing between two adjacent heat radiating fins in the center region is smaller than a spacing between two adjacent heat radiating fins in the end region.
8. The liquid cooling plate according to any one of claims 1 to 7, wherein the water inlet flow passage and the water outlet flow passage each extend in a second direction, the second direction being perpendicular to the first direction.
9. A blade battery, wherein the blade battery comprises a plurality of single batteries and the liquid cooling plate according to any one of claims 1-8, the arrangement direction of the plurality of single batteries is a second direction, the second direction is perpendicular to the first direction, and the liquid cooling plate is located on the surfaces of the plurality of single batteries.
10. The blade battery of claim 9, further comprising at least two battery modules, wherein the battery modules comprise a plurality of the single batteries, and wherein the liquid cooling plate comprises at least two liquid cooling areas in the second direction, wherein the liquid cooling areas are in one-to-one correspondence with the battery modules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421958969.5U CN223006842U (en) | 2024-08-13 | 2024-08-13 | Liquid cooling plate and blade battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421958969.5U CN223006842U (en) | 2024-08-13 | 2024-08-13 | Liquid cooling plate and blade battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN223006842U true CN223006842U (en) | 2025-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202421958969.5U Active CN223006842U (en) | 2024-08-13 | 2024-08-13 | Liquid cooling plate and blade battery |
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| Country | Link |
|---|---|
| CN (1) | CN223006842U (en) |
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2024
- 2024-08-13 CN CN202421958969.5U patent/CN223006842U/en active Active
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Effective date of registration: 20260104 Address after: 261001 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee after: WEICHAI POWER Co.,Ltd. Country or region after: China Patentee after: Weichai New Energy Power Technology Co.,Ltd. Patentee after: Weichai (Yantai) New Energy Power Technology Co.,Ltd. Address before: 261001 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee before: WEICHAI POWER Co.,Ltd. Country or region before: China Patentee before: Weichai New Energy Power Technology Co.,Ltd. |