CN210516938U - Radiating device of double-layer automatic capacity testing machine of lithium ion battery - Google Patents
Radiating device of double-layer automatic capacity testing machine of lithium ion battery Download PDFInfo
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- CN210516938U CN210516938U CN201921733534.XU CN201921733534U CN210516938U CN 210516938 U CN210516938 U CN 210516938U CN 201921733534 U CN201921733534 U CN 201921733534U CN 210516938 U CN210516938 U CN 210516938U
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Abstract
The utility model relates to the field of lithium battery preparation, in particular to a heat dissipation device of a double-layer automatic capacity testing machine of a lithium ion battery, which comprises the double-layer automatic capacity testing machine, wherein the outer side of the double-layer automatic capacity testing machine is provided with a closed structure, and the inner part of the double-layer automatic capacity testing machine is provided with a plurality of clamp tools for fixing a lithium battery cell; every anchor clamps frock correspondence can be dismantled and be equipped with one set of heat abstractor main part, and the heat abstractor main part is used for blowing into the enclosed construction with the lower air of double-deck automatic capacity test machine external environment temperature and pressure boost in, forms the air jet of higher speed and blows to the tight fixed lithium cell electricity core of anchor clamps frock clamp. The utility model discloses rely on high-speed efflux air to strengthen the heat transfer, form higher forced convection heat transfer coefficient on air and electric core surface, realize the heat dissipation of strengthening of the finite area of contact of electricity core and air.
Description
Technical Field
The utility model relates to a lithium cell preparation field specifically is a double-deck automatic capacity test machine heat abstractor of lithium ion battery can be used to the cooling of lithium cell electricity core in the preparation process.
Background
The lithium ion battery has high energy density which can reach 150-200 Wh/kg; the open circuit voltage is high and can reach 3.3-4.2V; the output power is high and can reach 300-1500W/kg; no memory effect; low self-discharge, etc. Therefore, the lithium ion battery is widely applied to the fields of consumer electronics products, military products, aviation products and the like.
In the process of preparing the lithium ion battery, the charge and discharge capacity of the lithium ion battery core needs to be tested, in order to improve the test efficiency and realize the batch charge and discharge test of the lithium ion battery core, an automatic capacity tester (ACT for short) automatic device is adopted to carry out the batch charge and discharge test in the technical process. The Automatic Capacity Tester (ACT) mainly comprises:
1) electric core automatic assembly device: the test fixture is used for automatically installing the tested battery core in the test fixture tool and automatically transferring the battery core out of the fixture tool after testing;
2) a fixture tool: the device is used for clamping and positioning a plurality of battery cores, providing a charging and discharging test electrical interface, alternately compressing and positioning the plurality of battery cores through an internal array laminate, and generally internally arranging a temperature sensor and an electric heater in the laminate for temperature monitoring and electric heating in the capacity test process;
3) a closed structure: in order to ensure the environment cleanliness in the capacity testing process, a plurality of clamp tools, an automatic battery cell assembling device and the like are sealed and isolated from the surrounding environment by using a sealing structure. For example, in a typical double-layer automatic capacity testing machine, a glass cover is adopted to form a closed structure to close 10 sets of fixture tools and an automatic battery cell assembling device, and the fixture tools are arranged in an upper layer and a lower layer.
In order to ensure the stable performance of the battery core of the lithium battery, the temperature of the battery core needs to be controlled not to exceed the maximum allowable temperature, which is generally 50 ℃ in the capacity test process. The electric core discharge process in the automatic capacity tester is the heat production process, and the electric core discharges and generates heat and leads to electric core temperature to rise, surpasss the highest temperature that electric core allows and influences lithium cell performance stability, must take effectual heat dissipation measure. Because a plurality of electric cores in the double-layer automatic capacity testing machine are compressed by the array laminate in the fixture tool, the contact area between the electric core and the ambient air is small, and the automatic capacity testing machine is of a closed structure, the heat dissipation of the electric core discharging process is very unfavorable, the over-temperature of the electric core discharging process caused by the over-temperature becomes a key factor influencing the product performance, and effective heat dissipation measures must be taken.
The existing lithium ion battery double-layer automatic capacity testing machine mainly comprises natural convection cooling, ventilation cooling and liquid cooling (water cooling). The natural convection cooling is to dissipate heat through the air in the battery cell and the closed structure in a natural convection mode, and is characterized by being simpler and without additional devices, but because the natural convection heat coefficient is low, the contact area of the battery cell and the ambient air is small, and the automatic capacity testing machine is a closed structure, the natural convection heat dissipation effect is poor, and the natural convection cooling is also a main reason for the overtemperature in the battery cell discharging process in the automatic capacity testing machine adopting the natural convection cooling mode at present. In order to improve ventilation and heat exchange, part of automatic capacity testing machines adopt a ventilation circulation mode to improve heat dissipation in a closed structure, but due to the reasons that the contact area of a battery cell and ambient air is small, the heat transfer coefficient of forced convection is low due to unreasonable airflow organization and the like, the problem of over-temperature of the battery cell in the discharging process still exists after ventilation measures are increased. Liquid cooling is for natural convection and ventilation cooling, and heat dispersion improves by a wide margin, and through leading to the cooling medium (generally for water) of certain flow and temperature in the plywood that compresses tightly at electric core promptly, directly takes away electric core heat production through cooling medium, can satisfy electric core temperature control requirement. However, the liquid cooling method needs to be provided with a liquid supply cooling device, a pipeline system and a cooling working medium flow channel structure in the laminate, the complexity and the cost of the system are greatly increased, and the risk of leakage of the cooling working medium exists in an automatic capacity tester, so that the potential safety hazard is generated. Therefore, a cooling mode of the double-layer automatic capacity testing machine for the lithium ion battery, which is safer, more reliable and has higher cooling efficiency, is needed to be sought, so as to overcome the defects in the current practical application.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at is low to current natural convection cooling, general ventilation cooling mode radiating efficiency, and liquid cooling system is complicated, there is the problem of security hidden danger, overcomes current double-deck automatic capacity test machine cooling technology's not enough, provides a double-deck automatic capacity test machine heat abstractor of lithium ion battery.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
a heat dissipation device for a double-layer automatic capacity testing machine of a lithium ion battery comprises the double-layer automatic capacity testing machine, wherein a closed structure is arranged on the outer side of the double-layer automatic capacity testing machine, and a plurality of clamp tools for fixing lithium battery cores are arranged inside the double-layer automatic capacity testing machine; each clamp tool is correspondingly detachably provided with a set of heat dissipation device main body, and the heat dissipation device main body is used for sucking air with lower external environment temperature of the double-layer automatic capacity testing machine and pressurizing the air to blow into the closed structure, so that air jet with higher speed is blown to the clamp tool to clamp and fix the lithium battery cell.
As a further aspect of the present invention: and the fixture tool inside the double-layer automatic capacity testing machine is arranged into an upper layer and a lower layer.
As a further aspect of the present invention: a heat dissipation device main body arranged corresponding to the clamp tool on the upper layer in the double-layer automatic capacity testing machine is arranged in a corresponding area on the top of the double-layer automatic capacity testing machine through a supporting structure; and the heat dissipation device main body of the lower layer in the double-layer automatic capacity tester, which is correspondingly arranged by the fixture tool, is directly arranged at the bottom area corresponding to the lower-layer fixture tool.
As a further aspect of the present invention: the heat abstractor main part includes fan, filter equipment, connecting tube, transition pipeline, even cloth wind pipeline, jet nozzle array board and jet nozzle, install filter equipment on the air intake of fan, install the connecting tube on the air outlet of fan, the other end of connecting tube passes through the transition pipeline and is connected with even cloth wind pipeline, jet nozzle array board is installed to the bottom of even cloth wind pipeline, install a plurality of jet nozzle on the jet nozzle array board.
As a further aspect of the present invention: the fan is a centrifugal fan.
As a further aspect of the present invention: the filtering device comprises a stainless steel wire mesh, and the aperture of the stainless steel wire mesh is not smaller than 200 meshes.
As a further aspect of the present invention: the connecting pipeline, the transition pipeline, the uniform air distribution pipeline, the jet nozzle array plate and the jet nozzles are all made of stainless steel plates with the thickness of 1 mm.
As a further aspect of the present invention: the uniform air distribution pipeline is a rectangular variable-cross-section pipeline, the uniform air distribution pipeline changes gradually from the inlet end to the closed tail end, and the area ratio of the cross sections of the inlet end to the tail end is controlled to be 2-4.
As a further aspect of the present invention: the jet nozzle is of a reducing structure, and the diameter of an inlet of the jet nozzle is 2-3 times of that of an outlet; the jet flow nozzle comprises a curve transition section and a straight line section, and the curvature radius of the curve transition section is not less than 2 times of the diameter of the outlet of the jet flow nozzle.
Compared with the prior art, the utility model discloses the beneficial effect of embodiment is:
1) the main body of the heat dissipation device adopts an air high-speed jet cooling mode, compared with natural convection cooling and general ventilation cooling, the convection heat exchange coefficient is obviously improved, and the heat dissipation requirement under the limited contact area of the battery core and air can be realized;
2) compared with a liquid cooling heat dissipation mode, the heat dissipation device main body adopts high-speed jet cooling of air, so that the risk of leakage of a cooling working medium is avoided, and the heat dissipation device is safer and more reliable;
3) the heat dissipation device main body and a clamp tool, a compression laminate, a battery cell automatic assembly device and the like in the double-layer automatic capacity testing machine do not have mechanical installation interfaces, and the heat dissipation device main body is particularly suitable for the transformation of a heat dissipation system of the existing double-layer automatic capacity testing machine;
4) the heat dissipation device main body is in a compact integrated assembly form, can be flexibly selected and matched according to the number and the positions of the clamp tools, and is convenient to install.
Drawings
Fig. 1 is a schematic diagram of layout positions according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a composition structure of an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a jet nozzle in an embodiment of the present invention.
Fig. 5 is the embodiment of the utility model provides an in the embodiment size position relation sketch map of jet nozzle and anchor clamps frock electricity core.
In the figure: 1-closed structure, 2-double-layer automatic capacity testing machine, 3-clamp tool, 4-support structure, 10-heat dissipation device main body, 101-fan, 102-filtering device, 103-connecting pipeline, 104-transition pipeline, 105-uniform air distribution pipeline, 106-jet nozzle array plate and 107-jet nozzle.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Example 1
Referring to fig. 1-5, in an embodiment of the present invention, a heat dissipation device for a double-layer automatic capacity testing machine of a lithium ion battery, which provides high-speed jet air for a battery cell to cool the battery cell, includes a double-layer automatic capacity testing machine 2, wherein an enclosed structure 1 is disposed outside the double-layer automatic capacity testing machine 2, the enclosed structure 1 is implemented by using the existing related technology, a plurality of fixture tools 3 for fixing the battery cell are disposed inside the double-layer automatic capacity testing machine 2, that is, the double-layer automatic capacity testing machine 2 generally adopts the enclosed structure 1 to isolate the fixture tools 3 from the external environment; each of the fixture fixtures 3 is detachably provided with a set of heat dissipation device main bodies 10 correspondingly, the heat dissipation device main bodies 10 can be flexibly configured according to the layout position and the number of the fixture fixtures 3, namely, the heat dissipation device of the double-layer automatic capacity testing machine is designed in an integrated assembly mode, and can be integrally disassembled and assembled.
As shown in fig. 2-4, the heat dissipation device main body 10 includes a fan 101, a filter 102, a connecting pipeline 103, a transition pipeline 104, an even air distribution pipeline 105, a jet nozzle array plate 106 and jet nozzles 107, the filter 102 is installed on an air inlet of the fan 101, the connecting pipeline 103 is installed on an air outlet of the fan 101, the other end of the connecting pipeline 103 is connected with the even air distribution pipeline 105 through the transition pipeline 104, the jet nozzle array plate 106 is installed at the bottom of the even air distribution pipeline 105, and the jet nozzles 107 are installed on the jet nozzle array plate 106; the fan 101 provides driving force for high-speed air jet flow, and ambient air outside the double-layer automatic capacity testing machine 2 is sucked, pressurized and blown to the surface of the battery cell in the clamp tool 3; the filtering device 102 is used for filtering the excess in the air and controlling the cleanliness of the interior of the double-layer automatic capacity testing machine 2; the connecting pipeline 103 is used for connecting the outlet of the fan 101 with the inlet of the transition pipeline 104, and the transition pipeline 104 is connected with the inlet of the uniform air distribution pipeline 105 in a matching manner; the jet nozzles 107 are arranged on the jet nozzle array plate 106 to form a uniform jet nozzle 107 array corresponding to a region of the fixture tool 3 which needs heat dissipation and cooling, and air is ejected from the jet nozzles 107 at a high speed under the drive of the fan 101 to cool the electric core inside the fixture tool 3; the uniform air distribution pipeline 105 adjusts dynamic pressure and static pressure distribution of internal air through variable cross-section control, uniform air outlet of the jet nozzle 107 array on the jet nozzle array plate 106 is achieved, and consistency of cell temperature is improved.
The operation mode of the heat sink main body 10 is: the external equipment supplies power and controls the switch of the fan 101, and the fan 101 is powered on and is in a working state in the process of testing the capacity of the battery cell; after the capacity test is finished, the fan 101 lags for a certain time, and the power is cut off when the temperature of the battery cell is lower than the maximum allowable temperature. The electric core cooling device mainly provides driving force through the fan 101, uniform air distribution in the area corresponding to the clamp tool 3 is formed through the uniform air distribution pipeline 105, and high-speed air jet flow formed by the jet flow nozzle 107 is used for efficiently cooling the electric core in the clamp tool 3.
Example 2
Referring to fig. 1, the difference between the present embodiment and embodiment 1 is:
in this embodiment, the fixture tool 3 inside the double-layer automatic capacity testing machine 2 is arranged with an upper layer and a lower layer; specifically, as shown in fig. 1, the heat sink main body 10 disposed correspondingly to the fixture tool 3 on the upper layer in the double-layer automatic capacity testing machine 2 is disposed in a corresponding area on the top of the double-layer automatic capacity testing machine 2 through the supporting structure 4; the heat dissipation device main bodies 10 correspondingly arranged on the clamp tools 3 of the lower layer in the double-layer automatic capacity testing machine 2 are directly arranged at the bottom areas corresponding to the clamp tools 3 of the lower layer, and the heat dissipation device main bodies 10 of the upper layer and the lower layer are not in direct contact with the clamp tools 3.
The utility model discloses a concrete implementation process as follows:
1) and determining the required convective heat transfer coefficient.
According to inside electric core calorific capacity of anchor clamps frock 3, the highest temperature of allowwing and outside ambient temperature, heat transfer area, confirm required convection heat transfer coefficient, electric core and air contact department convection heat transfer coefficient h should satisfy promptly:
q is the battery cell heat productivity and is determined according to the size, capacity and the like of the battery cell discharge current; a is the contact heat exchange area of the battery cell and air; t is1The maximum temperature allowed by the cell; t is2The outside ambient air temperature.
2) And determining the required jet flow wind speed and wind quantity.
The convective heat transfer coefficient of the convective heat transfer on the surface of the battery cell can be estimated according to the following formula:
wherein λ is the thermal conductivity of air; r is a radius taking the air jet stagnation point on the surface of the battery cell as a center; d is the diameter of the jet nozzle 107; h is a vertical distance from an outlet of the jet nozzle 107 to the surface of the electric core of the fixture tool 3, which is shown in detail in fig. 5; pr is the Plantt number of air; reDIs a Reynolds number characteristic of the diameter D of the jet nozzle 107, and
wherein ρ is the air density; mu is the aerodynamic viscosity coefficient; v is the exit wind velocity of the jet nozzle 107. It is generally recommended that the distance H from the exit of the jet nozzle 107 to the heat dissipation surface and the diameter D of the jet nozzle 107 satisfy: H/D is 5 or more and 10 or less, and the diameter D of the jet nozzle 107 can be determined according to the distance H between the jet nozzle 107 and the heat dissipation surface. The distance between the jet nozzles 107 (which may be approximately 2r) satisfies: 2r/D is more than or equal to 5 and less than or equal to 15, and the number of the jet nozzles 107 can be determined according to the size of a heat dissipation area of the clamp tool 3, and the jet nozzles are generally uniformly distributed, as shown in FIG. 3. The determined position, size, wind speed and wind quantity parameters finally need to meet the requirement of the convection heat exchange coefficient h in 1). After the system parameters are preliminarily determined according to the method, due to the mutual influence among the jet flow arrays, a CFD numerical simulation model is established to carry out three-dimensional thermal analysis simulation determination.
3) The fan 101 selects a centrifugal fan, the system resistance can be calculated according to the air quantity and the air speed determined in the step 2), and finally the air quantity and the pressure head requirement of the centrifugal fan are calculated, and the air quantity and the resistance design margin which are not less than 1.2 times are selected in comparison with a theoretical calculation result.
4) The filtering device 102 is made of a stainless steel wire mesh, generally not smaller than 200 meshes, an interface is matched with the inlet of the fan 101 in size, and corresponding specifications can be selected and matched according to the cleanliness control requirement of the double-layer automatic capacity testing machine 2.
5) The connecting pipeline 103, the transition pipeline 104, the uniform air distribution pipeline 105, the jet nozzle array plate 106 and the jet nozzles 107 are made of stainless steel plates, and the recommended thickness is 1 mm.
6) The uniform air distribution pipeline 105 is a rectangular variable-cross-section pipeline, the pipeline changes gradually from the inlet end to the closed tail end, the area ratio of the cross section of the inlet end to the cross section of the tail end is controlled to be 2-4, and the uniform air speed of the outlet of each jet nozzle 107 on the jet nozzle array plate 106 is guaranteed through CFD three-dimensional simulation analysis optimization.
7) The jet nozzle 107 adopts a reducing form, the diameter of an inlet of the jet nozzle 107 is 2-3 times of the diameter D of an outlet so as to reduce local resistance loss at the inlet, the inlet is divided into a curve transition section and a straight line section, and the curvature radius of the curve transition section is recommended to be not less than 2D, as shown in fig. 4.
Details not described in the present specification belong to the prior art known to those skilled in the art.
This double-deck automatic capacity test machine heat abstractor of lithium ion battery utilizes heat abstractor main part 10 to inhale the lower air of double-deck automatic capacity test machine 2 outside ambient temperature and pressure boost and insufflates in enclosed construction 1, forms the air jet of higher speed and blows to the tight fixed lithium cell electricity core of anchor clamps frock 3 clamp, relies on high-speed jet air to strengthen the heat transfer, forms higher forced convection heat transfer coefficient on air and electric core surface, realizes the heat dissipation of strengthening of the limited area of contact of electricity core and air.
In practical application, the method has the following outstanding advantages:
1) the heat dissipation device main body 10 adopts an air high-speed jet cooling mode, compared with natural convection cooling and general ventilation cooling, the convection heat exchange coefficient is obviously improved, and the heat dissipation requirement under the limited contact area of the battery core and air can be realized;
2) compared with a liquid cooling heat dissipation mode, the heat dissipation device main body 10 adopts air high-speed jet cooling, so that the risk of leakage of a cooling working medium is avoided, and the heat dissipation device is safer and more reliable;
3) the heat dissipation device main body 10 and the clamp tool 3, the compression laminate, the automatic battery cell assembly device and the like in the double-layer automatic capacity testing machine 2 do not have mechanical installation interfaces, and the heat dissipation device main body is particularly suitable for the transformation of a heat dissipation system of the existing double-layer automatic capacity testing machine 2;
4) the heat dissipation device main body 10 is in a compact integrated component form, can be flexibly selected and matched according to the number and the positions of the clamp tools 3, and is convenient to install.
The above is only the preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent.
Claims (9)
1. The utility model provides a double-deck automatic capacity test machine heat abstractor of lithium ion battery, includes double-deck automatic capacity test machine (2), the outside of double-deck automatic capacity test machine (2) is equipped with enclosed construction (1), and the inside of double-deck automatic capacity test machine (2) is equipped with a plurality of anchor clamps frock (3) that are used for fixed lithium cell electricity core, its characterized in that:
every anchor clamps frock (3) correspond and to dismantle and be equipped with one set of heat abstractor main part (10), heat abstractor main part (10) are used for with the lower air of double-deck automatic capacity test machine (2) external environment temperature inhales and the pressure boost is blown in enclosed construction (1), form the air jet of higher speed and blow to anchor clamps frock (3) press from both sides the tight fixed lithium cell electricity core.
2. The heat dissipation device for the double-layer automatic capacity testing machine of the lithium ion battery as claimed in claim 1, wherein the clamp tooling (3) inside the double-layer automatic capacity testing machine (2) is arranged with an upper layer and a lower layer.
3. The heat dissipation device of the lithium ion battery double-layer automatic capacity testing machine according to claim 2, wherein a heat dissipation device main body (10) correspondingly arranged on the clamp tool (3) at the upper layer in the double-layer automatic capacity testing machine (2) is arranged at a corresponding area at the top of the double-layer automatic capacity testing machine (2) through a support structure (4); and the heat dissipation device main body (10) which is arranged in the double-layer automatic capacity testing machine (2) and corresponds to the lower-layer clamp tool (3) is arranged in the bottom area corresponding to the lower-layer clamp tool (3).
4. The heat dissipation device for the double-layer automatic capacity testing machine of the lithium ion battery according to any one of claims 1 to 3, wherein the heat dissipation device main body (10) comprises a fan (101), a filtering device (102), a connecting pipeline (103), a transition pipeline (104), a uniform air distribution pipeline (105), a jet nozzle array plate (106) and jet nozzles (107), the filtering device (102) is installed at an air inlet of the fan (101), the connecting pipeline (103) is installed at an air outlet of the fan (101), the other end of the connecting pipeline (103) is connected with the uniform air distribution pipeline (105) through the transition pipeline (104), the jet nozzle array plate (106) is installed at the bottom of the uniform air distribution pipeline (105), and the jet nozzle array plate (106) is provided with the plurality of jet nozzles (107).
5. The heat dissipation device of the lithium ion battery double-layer automatic capacity testing machine as claimed in claim 4, wherein the fan (101) is a centrifugal fan.
6. The heat dissipation device of the lithium ion battery double-layer automatic capacity testing machine as claimed in claim 5, wherein the filtering device (102) comprises a stainless steel wire mesh, and the aperture of the stainless steel wire mesh is not smaller than 200 meshes.
7. The heat dissipation device for the double-layer automatic capacity testing machine of the lithium ion battery as claimed in claim 6, wherein the connecting pipeline (103), the transition pipeline (104), the uniform air distribution pipeline (105), the jet nozzle array plate (106) and the jet nozzles (107) are all made of stainless steel plates with the thickness of 1 mm.
8. The heat dissipation device for the double-layer automatic capacity testing machine of the lithium ion battery as claimed in claim 7, wherein the uniform air distribution pipeline (105) is a rectangular variable cross-section pipeline, the uniform air distribution pipeline (105) is gradually changed from an inlet end to a closed tail end, and the cross-sectional area ratio of the inlet end to the tail end is controlled to be 2-4.
9. The heat dissipation device of the lithium ion battery double-layer automatic capacity testing machine is characterized in that the jet nozzle (107) adopts a tapered structure, and the diameter of an inlet of the jet nozzle (107) is 2-3 times of that of an outlet; the jet nozzle (107) comprises a curved transition section and a straight line section, and the curvature radius of the curved transition section is not less than 2 times of the outlet diameter of the jet nozzle (107).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921733534.XU CN210516938U (en) | 2019-10-15 | 2019-10-15 | Radiating device of double-layer automatic capacity testing machine of lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921733534.XU CN210516938U (en) | 2019-10-15 | 2019-10-15 | Radiating device of double-layer automatic capacity testing machine of lithium ion battery |
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| CN210516938U true CN210516938U (en) | 2020-05-12 |
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