Immersed battery temperature testing device

Abstract

The utility model relates to the technical field of energy storage, automobile battery packs and the like, and particularly discloses an immersed battery temperature testing device which comprises a box body, a top cover, a battery cell module and a temperature control structure, the battery cell module is placed at the bottom of an inner cavity of the box body, the inner cavity is filled with cooling liquid capable of being used for conducting heat, and a sealing strip is arranged between the box body and the top cover to prevent leakage. The battery cell module can be connected with external equipment through a data transmission port and a charging and discharging interface which are arranged on the box body, the temperature control structure comprises a cooling fin, a spoiler group and a plurality of flow channels shown in an attached drawing, and the flow channels are communicated with the liquid inlet and the liquid outlet to jointly realize temperature control on the battery cell module. The immersed battery temperature testing device provided by the utility model has the remarkable advantages of high heat dissipation efficiency, low cost, safety, reliability and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery thermal management technical field especially relates to a kind of immersed battery temperature testing device. BACKGROUND

[0002] With the wide application of battery in energy storage, electric power and automobile fields, the temperature control of battery module becomes more and more important. Since the performance of battery, including discharge rate and charging efficiency, is greatly affected by temperature, excessive temperature can accelerate battery aging and reduce its cycle life. Only in the appropriate temperature range, the battery can provide the best performance. Moreover, battery may have thermal runaway under overheating condition, which can cause battery damage, fire or even explosion.

[0003] Patent 202011035446.X discloses an immersed liquid-cooled battery pack, which includes a shell, a battery pack, a liquid inlet cavity, a liquid outlet cavity, a current equalization plate and the like. The battery pack is provided with a liquid inlet cavity and a liquid outlet cavity on both sides along the second direction. The cooling liquid enters the liquid inlet cavity from the liquid inlet, flows through the battery pack and then flows into the liquid outlet cavity, and then flows out from the liquid outlet. However, in some cases, for example when the water flow is less than 1 L / min, it is difficult to control the temperature difference of the battery pack below 5 °C. When using special cooling liquid and complex system design test system, it has high cost. The test process is complicated and the precision is not high, which needs to be optimized.

[0004] Therefore, it is necessary to develop an immersed battery temperature testing device to solve the problems of low heat dissipation efficiency, poor safety and high cost of existing battery system. UTILITY MODEL CONTENTS

[0005] Based on the above technical problems, the utility model provides an immersed battery temperature testing device with high heat dissipation efficiency, low cost, safety and reliability.

[0006] The immersed battery temperature testing device provided by the present application comprises a box body, a top cover, a battery cell module and a temperature control structure. The box body is in contact with the top cover, and the contact surface is provided with a groove. A sealing strip is placed in the groove to prevent leakage of the cooling liquid. The battery cell module is arranged at the bottom of the inner cavity of the box body, and the battery cell monomers are connected in series or parallel. The temperature control structure comprises a heat sink, a turbulence fin group and a plurality of flow channels.

[0007] Optionally, the first direction is defined from the liquid inlet to the liquid outlet, and the second direction is perpendicular to the first direction,

[0008] The two side walls parallel to the first direction of the box body are first side wall and second side wall, and the data transmission port is connected to the outside of the first side wall, so as to facilitate the external equipment to monitor the temperature, voltage and other data of the battery cell module in real time.

[0009] Optionally, the heat dissipation fins are arranged on the first side wall and the second side wall, both of the heat dissipation fins are in direct contact with the box body, the arrangement direction of both of the heat dissipation fins is parallel to the first direction and is symmetrically distributed, and the heat dissipation fins are not in contact with the battery cell module, so that a heat dissipation flow channel is formed between the heat dissipation fins and the battery cell module.

[0010] Optionally, the turbulence fin group is arranged between the battery cell modules, the turbulence fin group is composed of a plurality of turbulence fins arranged at the bottom of the inner cavity of the box body, and the arrangement direction of the turbulence fin group is parallel to the first direction, so that the turbulence fin group and the battery cell module form a gap flow channel.

[0011] Optionally, a pressure relief valve is arranged on the upper surface of the top cover near the liquid outlet side, so that the pressure can be released in time when the pressure in the box body is too large, thereby avoiding danger, and the top cover is kept at a certain distance from the battery cell module, so that a top flow channel is formed between the top cover and the battery cell module.

[0012] Optionally, the battery cell module is composed of a plurality of battery cell monomers connected in series or in parallel, the output end of the battery cell module is close to the top cover, and the battery cells are uniformly and evenly arranged in two rows along the first direction, the arrangement direction of the battery cells is the same as that of the turbulence fin group, branch flow channels are formed between the battery cells on the same side, and gap flow channels are formed between the adjacent battery cells and the turbulence fin group.

[0013] Optionally, the setting height of the liquid outlet is obviously higher than that of the liquid inlet.

[0014] Optionally, the heat dissipation flow channel, the top flow channel, the gap flow channel and the branch flow channel are communicated with the liquid inlet and the liquid outlet.

[0015] Optionally, the test system can meet the dielectric cooling liquid test of hydrocarbon-based oil liquid, silicone oil, fluorinated liquid, ethylene glycol aqueous solution and the like, and the battery not only includes a battery for energy storage, but also includes a battery for power, such as a solid lithium ion battery, a solid sodium ion battery and the like.

[0016] Compared with the prior art, the immersion type battery temperature test device provided by the present application can simultaneously monitor the temperatures of the top surface and each side surface of the battery. Since the battery is directly immersed in the cooling liquid, the contact thermal resistance is reduced, and a uniform and low-flow-resistance heat transfer path is provided. At the same time, compared with the conventional indirect liquid cooling, the device can simultaneously cool all surfaces of the battery and weaken the local heating effect of the battery tab, thereby improving the uniformity of the surface temperature of the battery. Moreover, since the dielectric fluid is directly in contact with the battery, there is no need to set a complex cooling plate and pipeline, so that the structure is more compact, and the volume energy density of the battery pack can be effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] FIG. 1 is an exploded structural schematic view of the immersion type battery temperature test device provided by an embodiment of the present application;

[0018] Fig. 2 is a top view of the immersed battery temperature testing device in Fig. 1 after removing the upper cover;

[0019] Fig. 3 is a sectional view of the immersed battery temperature testing device in Fig. 1 along the A-A direction; Figure 2

[0020] Fig. in which:

[0021] 1, box; 11, liquid inlet; 12, liquid outlet; 13, data transmission port; 14, charge and discharge interface; 15, top cover; 16, pressure relief valve; 17, first side wall; 18, second side wall;

[0022] 2, battery cell module;

[0023] 3, temperature control structure; 31, heat sink; 32, spoiler group; 33, heat dissipation flow channel; 34, top flow channel; 35, gap flow channel; 36, branch flow channel. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings in the embodiments of the present application. The described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] Referring to Figs. 1, 2 and 3, the immersed battery temperature testing device provided by the present application includes a box 1, a top cover 15, a battery cell module 2 and a temperature control structure 3. The box 1 is connected with the top cover 15 by screws. High-strength screws should be selected to avoid the top cover being opened by the huge pressure generated when the battery is out of control. A groove is arranged on the contact surface of the box 1 and the top cover 15. A sealing strip is placed in the groove to prevent leakage of the cooling liquid. The box 1 and the top cover 15 can be formed by welding or integrally formed. The material can be stainless steel, aluminum or other high-strength materials.

[0026] Specifically, the height of the sealing strip should be slightly higher than the depth of the groove. The sealing strip can be a rubber strip, a silica gel strip or other materials.

[0027] It should be noted that there are many types of cooling liquids, such as fluorinated liquid, hydrocarbon, silicone oil, ester, etc., which are not listed here.

[0028] In an embodiment, the temperature control structure 3 includes a heat sink 31, a spoiler group 32 and a plurality of flow channels. Specifically,

[0029] ​The heat dissipation flow channel 33 is formed between the heat dissipation fins 31 and the battery cell module 2, the top flow channel 34 is formed between the top cover 15 and the output end of the battery cell module 2, the branch flow channel 36 is formed between the same side battery cells, and the gap flow channel 35 is formed between the adjacent battery cells and the spoiler group 32. The heat dissipation flow channel 33, the top flow channel 34, the branch flow channel 36, and the gap flow channel 35 are in communication with the liquid inlet 11 and the liquid outlet 12.

[0030] With this arrangement, not only can the side of the battery cell module 2 be effectively cooled, but also the top surface of the battery cell module 2 can be cooled.

[0031] The cooling medium directly contacts the surface of the battery cell module 2, which significantly improves the heat dissipation capacity of the immersion cooling device, rapidly reduces the heat generated by the battery cell module 2 during charging and discharging, and achieves uniform temperature distribution, resulting in a smaller temperature difference.

[0032] It should be noted that the output end of the battery cell module 2 refers to the end where the positive and negative electrode interfaces of the battery cell are arranged.

[0033] The charging and discharging interface 14 is arranged on the outside of the first side wall 17 of the box body 1, and after connecting the load or charging device, the charging and discharging can be performed, therefore, the charging and discharging interface 14 should use a plug-in connector with good sealing performance to avoid leakage of the cooling liquid in the box body 1.

[0034] In an embodiment, the data transmission port 13 is connected to the outside of the first side wall 17 by screws or other means, and the data transmission port 13 can realize real-time monitoring of the state of the battery cell module 2 in the device by external equipment, and the data transmission content includes voltage, temperature, etc.

[0035] In an embodiment, the heat dissipation fins 31 are arranged on the first side wall 17 and the second side wall 18, respectively, and the heat dissipation fins on both sides are connected to the box body 1 by screws, the arrangement direction of the heat dissipation fins 31 on both sides is parallel to the first direction and is symmetrically distributed, the heat dissipation fins 31 on both sides are not in contact with the battery cell module 2, thereby forming a heat dissipation flow channel 33 therebetween, so as to effectively solve the problem of heat accumulation on the large surface of the battery cell.

[0036] Further, it should be noted that the position of the heat dissipation fins 31 should be within the height of the battery cell module 2, and the length should be greater than the length of the battery cell module 2 along the first direction, so that the heat dissipation fins 31 can better dissipate heat on the large surface of the battery cell.

[0037] In one embodiment, a baffle assembly 32 is disposed between the cell modules 2. The baffle assembly 32 is composed of multiple baffles welded to the bottom of the inner cavity of the housing 1. The arrangement direction of the baffle assembly 32 is parallel to the first direction so that the baffle assembly 32 and the cell module 2 form a gap channel 35. When the coolant flows in the gap channel 35, the baffle assembly 32 can make the coolant flow from the gap channel 35 to the branch channel 36. The tortuous flow of the coolant is beneficial to balancing the heat dissipation effect at various parts of the cell module 2.

[0038] Specifically, the heat sink 31 and the baffle assembly 32 can be made of metal or other non-metallic materials with excellent thermal conductivity to facilitate heat conduction between the battery module 2, the coolant, and the housing 1.

[0039] In one embodiment, a pressure relief valve 16 is provided on the upper surface of the top cover 15 near the liquid outlet 11, so that the pressure can be released in time when the pressure inside the housing 1 is too high, thereby avoiding danger. The top cover 15 and the output end of the battery cell module 2 are kept at a certain distance so that a top flow channel 34 is formed between them. It should be noted that the number of pressure relief valves 16 can be one or more, which is conducive to better ensuring the safety of the device.

[0040] Furthermore, the cell module 2 consists of multiple individual cells connected in series or parallel to form a group, and the output of the cell module 2...

[0041] The outlet end is close to the top cover 15 and the cells are evenly spaced in two rows along the first direction. The arrangement direction of the cells is the same as that of the baffle plate group 32. The spacing between cells on the same side is smaller than the spacing between adjacent cells. This arrangement makes the gap channel 35 larger than the branch channel 36, which reduces the flow resistance of the coolant and improves the heat exchange efficiency of the gap channel 35 to a certain extent.

[0042] In one embodiment, the outlet 12 is positioned at a height significantly higher than the inlet 11. Thus, the low-temperature coolant flows in from the lower inlet 11, and the coolant comes into full contact with the battery module 2, thereby carrying away or transferring heat. Finally, it flows out from the higher outlet 12 to achieve heat exchange. This increases the contact time between the coolant and the battery module 2, improving the heat exchange effect of the device.

[0043] It should be noted that the batteries targeted by the device described in this utility model include not only high-capacity energy storage batteries, but also solid-state batteries such as lithium-ion and sodium-ion batteries for power applications.

[0044] Furthermore, the terms "first", "second", "third", etc. as used herein are used as identifiers, and do not imply a sequence or order of importance, unless the context clearly indicates so or understanding of the recited technical term requires it. Thus, these terms, as used herein, are used merely as labels to distinguish between two or more distinct structural and / or functional features of the present application. Furthermore, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise.

[0045] It is also to be understood that the terminology used herein is for the purpose of describing the embodiments only and is not intended to be limiting, unless the context clearly indicates so. Thus, unless specifically defined in this specification, all terms are to be given their broadest possible interpretation.

Claims

1. An immersion battery temperature testing device, characterized by, It includes: The box (1), the top cover (15), the electric core module (2) and the temperature control structure (3), the box (1) is contacted with the top cover (15), the contact surface is equipped with the recess, the recess is placed in the sealing strip to prevent the cooling liquid leakage;The electric core module (2) is arranged in the inner chamber bottom of the box (1), and the electric core monomer is connected by series or parallel mode;The temperature control structure (3) includes the fin (31), the spoiler group (32) and multiple flow channels.

2. The submerged battery temperature testing device of claim 1, wherein, Liquid inlet (11) to liquid outlet (12) is the first direction, the direction perpendicular to the first direction is the second direction, the box (1) and the first direction parallel two side walls are the first side wall (17) and the second side wall (18), the data transmission port (13) is connected to the outside of the first side wall (17), so that the external device can monitor the temperature, voltage data of the electric core module (2) in real time.

3. The submerged battery temperature testing device of claim 2, wherein, The fin (31) is arranged on the first side wall (17) and the second side wall (18), and the two side fins (31) are directly contacted with the box (1), the arrangement direction of the two side fins (31) is parallel to the first direction and is symmetrically distributed, and the two side fins (31) are not contacted with the electric core module (2), so that the heat dissipation flow channel (33) is formed between them.

4. The submerged battery temperature testing device of claim 2, wherein, The spoiler group (32) is arranged between the electric core module (2), and the spoiler group (32) is composed of multiple spoilers arranged in the inner chamber bottom of the box (1), the arrangement direction of the spoiler group (32) is parallel to the first direction, so that the spoiler group (32) and the electric core module (2) form the gap flow channel (35).

5. The submerged battery temperature testing device of claim 2, wherein, The top cover (15) is arranged on the top surface of the top cover (15), and the pressure relief valve (16) is arranged on the side close to the liquid outlet (12), so that the pressure can be released in time when the pressure in the box is too large, thereby avoiding danger, and the top cover (15) and the electric core module (2) are kept a certain distance apart, so that the top flow channel (34) is formed between them.

6. The submerged battery temperature testing device of claim 5, wherein, The electric core module (2) is composed of multiple electric core monomers connected in series or parallel, the output end of the electric core module (2) is close to the top cover (15) and the electric core is evenly spaced in two rows along the first direction, the arrangement direction of the electric core is the same as that of the spoiler group (32), and the branch flow channel (36) is formed between the electric cores on the same side, and the gap flow channel (35) is formed between the adjacent electric cores and the spoiler group (32).

7. The submerged battery temperature testing device of claim 2, wherein, The setting height of the liquid outlet (12) is obviously higher than that of the liquid inlet (11).

8. The submerged battery temperature testing device of claim 3, wherein, The heat dissipation flow channel (33), the top flow channel (34), the gap flow channel (35) and the branch flow channel (36) are communicated with the liquid inlet (11) and the liquid outlet (12).

9. The submerged battery temperature testing device of claim 6, wherein: The test device meets the dielectric cooling liquid test of carbon hydrocarbon oil, silicone oil, fluorinated liquid and ethylene glycol aqueous solution, and the battery is a battery for energy storage or a power battery.

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