A fully immersed integrated pole liquid cooling device and battery pack

Abstract

The utility model provides a fully immersed integrated pole liquid cooling device, comprising a box body, wherein a plurality of battery cells are built in the box body, wherein the battery cells include a positive electrode and a negative electrode, and further comprising a cooling member arranged above the box body, wherein the cooling member and the battery cells are closed to form a plurality of cooling chambers, wherein the cooling chambers wrap the positive electrode and the negative electrode; the cooling member is provided with a liquid inlet, a liquid outlet and a flow guide channel connecting the various cooling chambers, and the volume of the cooling chamber is reduced by the above structure, so that the use of coolant is greatly reduced and the manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a full-immersion integrated pole liquid cooling device and a battery pack. Background Art

[0002] In recent years, with the continuous development of new energy vehicles, power batteries, as the power source of new energy batteries, have been widely used in new energy vehicles. The positive and negative electrodes of the battery cells will generate a lot of heat during use. If the heat is accumulated in the box and not discharged in time, it will directly affect the performance, safety and service life of the battery pack. Therefore, the heat dissipation system is an indispensable system for the battery pack.

[0003] Chinese patent document CN117790973A discloses a method of cooling a battery using liquid cooling, which cools the battery cell by completely immersing it in a coolant. This will require a large amount of coolant to cool the positive and negative electrodes of the battery cell, increasing manufacturing costs. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a fully immersed integrated pole liquid cooling device and a battery pack to solve the problems mentioned in the above background technology section.

[0005] The utility model is realized by the following technical solutions:

[0006] A fully immersed integrated pole liquid cooling device comprises a box body, wherein the box body houses a plurality of battery cells, wherein the battery cells comprise a positive electrode and a negative electrode, and further comprises a cooling member arranged above the box body, wherein the cooling member and the battery cells are closed to form a plurality of cooling chambers, wherein the cooling chambers wrap the positive electrode and the negative electrode; the cooling member is provided with a liquid inlet, a liquid outlet and a flow guide channel connecting the various cooling chambers.

[0007] Furthermore, the cooling member is provided with a limiting ring wrapping the positive electrode and the negative electrode, and the internal space of the limiting ring constitutes the cooling chamber.

[0008] Furthermore, the battery cell is provided with a flange, the flange surrounds the positive electrode and the negative electrode, and the outer wall of the limiting ring abuts against the inner wall of the flange.

[0009] Furthermore, the outer wall of the limiting ring is sleeved with a sealing ring abutting against the inner wall of the flange.

[0010] Furthermore, the cooling member includes a stopper, and the stopper fills the gaps between the battery cells and fills the gaps between the battery cells and the inner wall of the box body.

[0011] Furthermore, a sealing member is fixedly connected to the bottom of the stopper portion.

[0012] Furthermore, the sealing member is provided with a plurality of sealing portions abutting against the inner wall of the box body.

[0013] Furthermore, a cover plate is included, and an electrical connection plate is provided between the cooling element and the cover plate, and the electrical connection plate is used to electrically connect each of the battery cells.

[0014] Furthermore, a first positioning portion is provided on the top surface of the cover plate, and a second positioning portion adapted to the first positioning portion is provided on the bottom surface of the box body.

[0015] On the other hand, the utility model provides a battery pack, comprising a plurality of fully immersed integrated pole liquid cooling devices stacked in sequence.

[0016] The beneficial effects of the utility model are: a fully immersed integrated pole liquid cooling device, comprising a box body, wherein the box body has multiple battery cells built in, the battery cells include a positive electrode and a negative electrode, and also includes a cooling member arranged above the box body, the cooling member and the battery cells are closed to form a plurality of cooling chambers, and the cooling chambers wrap the positive electrode and the negative electrode; the cooling member is provided with a liquid inlet, a liquid outlet and a guide channel connecting the various cooling chambers, and the volume of the cooling chamber is reduced through the above structure, so that the use of coolant is greatly reduced and the manufacturing cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the first embodiment of the utility model.

[0018] Figure 2 for Figure 1 Horizontal section along AA.

[0019] Figure 3 for Figure 1 Vertical section along line BB.

[0020] Figure 4 It is an exploded view of the first embodiment of the utility model.

[0021] Figure 5 This is another exploded view of the first embodiment of the utility model.

[0022] Figure 6 It is a three-dimensional diagram of the first embodiment of the utility model.

[0023] Figure 7 for Figure 6 Horizontal section along AA.

[0024] Figure 8 for Figure 6Vertical section along line BB.

[0025] Fig. 9 This is an exploded view of the second embodiment of the utility model.

[0026] Fig.10 This is another exploded view of the second embodiment of the present invention.

[0027] Fig.11 It is a three-dimensional diagram of the battery pack of the present utility model.

[0028] The above drawings include the following reference numerals:

[0029] 1. Box body; 11. Second positioning part; 2. Battery cell; 21. Positive electrode; 22. Negative electrode; 23. Battery body; 24. Flanging; 3. Cooling part; 31. Liquid inlet; 32. Liquid outlet; 33. Flow guide channel; 34. Emergency flow channel; 341. Valve core; 35. Limiting ring; 351. Sealing ring; 36. Stopper; 361. Sealing part; 3611. Sealing part; 4. Cooling chamber; 5. Emergency chamber; 51. Temperature sensor; 52. Anti-leakage sensor; 7. Cover plate; 71. First positioning part; 8. Electrical connection plate; 81. Conductive column; 82. Positive electrode connecting wire; 83. Negative electrode connecting wire. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is claimed, but merely represents selected embodiments of the utility model.

[0031] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0032] Research and testing have shown that during the process of charging or discharging, the battery generates heat mainly because the current flows between the positive electrode 21 and the negative electrode 22 of the battery. Therefore, a certain amount of heat will be generated at the positive electrode 21 and the negative electrode 22. The coolant flows around the positive electrode 21 and the negative electrode 22 to dissipate the heat, thereby preventing the battery from thermal runaway.

[0033] The utility model proposes a fully immersed integrated pole liquid cooling device, which includes a box body 1, wherein the box body 1 has multiple battery cells 2 built therein, and the battery cells 2 include a positive electrode 21, a negative electrode 22 and a battery body 23. In order to reduce the use of coolant and reduce costs, the utility model reduces the amount of coolant used by setting a cooling member 3.

[0034] The cooling member 3 is arranged above the box body 1. The cooling member 3 and the battery cell 2 are closed to form a plurality of cooling chambers, a plurality of cooling chambers 4 and an emergency chamber 5. The cooling chamber 4 encloses the positive electrode 21 and the negative electrode 22. The cooling member 3 is provided with a liquid inlet 31, a liquid outlet 32, and a flow channel 33 connecting each cooling chamber 4, so that the coolant flows in from the liquid inlet 31, then flows in the cooling chamber 4 to cool the positive electrode 21 and the negative electrode 22, and finally flows out from the liquid outlet 32.

[0035] The cooling member 3 can completely wrap the battery body 23, or can form a hollow in the lower half of the battery body 23, so that the battery body 23, the box body 1 and the cooling member 3 surround and form an emergency chamber 5, so that the emergency chamber 5 wraps the lower half of the battery body 23. Under normal conditions, the coolant only flows in the cooling chamber 4.

[0036] When the emergency chamber 5 exists, the cooling member 3 is provided with an emergency flow channel 34 connecting the flow guide channel 33 and the emergency chamber 5, and the emergency flow channel 34 is provided with a valve core 341. A temperature sensor 51 is provided in the emergency chamber 5, and the temperature sensor 51 is used to sense the internal temperature of the emergency chamber 5 and control the opening or closing of the valve core 341. Under normal conditions, the valve core 341 is in a normally closed state. When the temperature sensor 51 detects that the internal temperature of the emergency chamber 5 rises rapidly, it indicates that the battery cell 2 has thermal runaway. At this time, the valve core 341 is opened to allow the coolant to enter the emergency chamber 5 through the emergency flow channel 34, and then the battery cell 2 is cooled to prevent the battery cell 2 from thermal runaway.

[0037] Preferably, the emergency flow channel 34 is arranged as close to the liquid inlet 31 as possible to shorten the running path of the coolant, accelerate the speed of the coolant entering the emergency chamber 5, and realize rapid cooling of the battery cell 2.

[0038] It also includes a cooling circulation mechanism (not shown in the figure), which is used to drive the coolant to pass through the cooling chamber 4 and circulate. That is, the coolant is introduced along the liquid inlet 31, passes through the guide channel 33 and the cooling chamber 4, and finally flows back to the cooling circulation mechanism through the liquid outlet 32, so as to realize the reuse of the coolant. The liquid inlet 31 and the liquid outlet 32 ​​are arranged on the same side of the cooling element 3, so that the liquid inlet 31 and the liquid outlet 32 ​​are conveniently connected to the cooling circulation mechanism.

[0039] The cooling circulation mechanism belongs to the prior art, and the cooling circulation mechanism can use a circulation pump or the like to circulate the coolant.

[0040] By reducing the total amount of coolant, the power of the cooling circulation mechanism to drive the coolant to circulate in the cooling chamber 4 can be reduced accordingly, and the reduction in the total amount of coolant can enable the coolant to flow quickly in each cooling chamber 4, thereby improving the cooling effect of the coolant on the positive electrode 21 and the negative electrode 22.

[0041] Reference Figures 1 to 5 The first embodiment of the cooling element 3 is shown. The specific structure of this embodiment is as follows:

[0042] In the first embodiment, the cooling member 3 is provided with a limiting ring 35 that wraps the positive electrode 21 and the negative electrode 22, and the inner space of the limiting ring 35 constitutes a cooling chamber 4. The cooling member 3 extends downward and supports the top surface of the battery body 23, thereby forming a sealed cooling chamber 4.

[0043] In one embodiment, a flange 24 is provided around the battery cell 2, and the flange 24 is arranged around the positive electrode 21 and the negative electrode 22. The limiting ring 35 is embedded in the flange 24, and the outer wall of the limiting ring 35 abuts against the inner wall of the flange 24, thereby forming a sealed cooling chamber 4.

[0044] In order to prevent the coolant from leaking into the emergency chamber 5, the outer periphery of the limiting ring 35 is sleeved with a sealing ring 351 that abuts against the inner wall of the flange 24. The number of the sealing rings 351 can be multiple. By setting the sealing rings 351 on the outer wall of the limiting ring 35 and the inner wall of the flange 24, the coolant can be prevented from leaking into the emergency chamber 5.

[0045] Reference Figures 6 to 10 The second embodiment of the cooling element 3 is shown. The specific structure of this embodiment is as follows:

[0046] The cooling member 3 includes a stopper 36 , which seals and fills the gaps between the battery cells 2 and fills the gaps between the battery cells 2 and the side wall of the box body 1 .

[0047] In order to prevent the coolant from leaking into the emergency chamber 5, a seal 361 is fixed to the bottom of the stopper 36. The seal 361 is made of rubber. The stopper 36 can be glued to the seal 361. As another embodiment (not shown in the figure), a groove can be set in the seal 361, and then the stopper is inserted into the groove. Finally, glue is added to the groove to glue the stopper 36 to the seal 361. The stopper 36 abuts against the battery cell 2 and the inner wall of the box body 1 through the seal 361.

[0048] Preferably, the sealing member 361 is provided with a plurality of sealing portions 3611 abutting against the inner wall of the box body 1 and the battery cells 2, so as to further improve the sealing effect.

[0049] It also includes a cover plate 7, which is arranged above the cooling member 3. The cover plate 7 and the cooling member 3 or the box body 1 are detachably connected by a screw structure (not shown in the figure). The cover plate 7 and the cooling member 3 are closed to form an installation chamber, and an electrical connection plate 8 is arranged in the installation chamber. The electrical connection plate 8 is used to electrically connect each battery cell 2. The detachable connection between the cover plate 7 and the cooling member 3 or the box body 1 facilitates the repair of the electrical connection plate 8 when it is damaged.

[0050] Specifically, the electrical connection plate 8 is provided with a conductive column 81 penetrating the cooling member 3 . When the cooling member 3 is docked with the housing 1 , the conductive column 81 just abuts against the positive electrode 21 and the negative electrode 22 , thereby connecting the plurality of battery cells 2 in series.

[0051] The electrical connection plate 8 also includes a positive electrode connection line 82 and a negative electrode connection line 83 that extend laterally from the cooling member 3. The liquid inlet 31 and the liquid outlet 32 ​​and the positive electrode connection line 82 and the negative electrode connection line 83 are respectively arranged on both sides of the symmetry plane of the cooling member 3, so that the liquid inlet 31 and the liquid outlet 32, the positive electrode connection line 82 and the negative electrode connection line 83 do not interfere with each other when connected to external components.

[0052] In the first and second embodiments of the cooling member 3 , there are gaps between the bottom surface of the cooling member 3 and the top surfaces of the positive electrode 21 and the negative electrode 22 , so that the coolant can completely wrap the positive electrode 21 and the negative electrode 22 , thereby improving the cooling effect on the positive electrode 21 and the negative electrode 22 .

[0053] The coolant may be electronic fluorinated liquid, such as hydrofluoroether HFE, hydrofluoroolefin HFO, silicone oil, etc.

[0054] An anti-leakage sensor 52 is provided in the emergency chamber 5. When the anti-leakage sensor 52 detects coolant, an alarm signal is issued to remind manual maintenance.

[0055] The anti-leakage sensor 52 can be a humidity sensor or a liquid level sensor. When the anti-leakage sensor 52 uses a humidity sensor, when the humidity sensor detects that the humidity in the emergency chamber 5 reaches a set threshold, it indicates that the coolant has penetrated into the emergency chamber 5; when the anti-leakage sensor 52 uses a liquid level sensor, when the liquid level sensor detects that the humidity in the emergency chamber 5 reaches a certain height, it indicates that the coolant has penetrated into the emergency chamber 5.

[0056] When the anti-leakage sensor 52 senses the coolant and the valve core 341 is opened, it indicates that the battery has thermal runaway and a danger alarm signal is issued to remind passengers to quickly stay away from the car, electric vehicle or other vehicles equipped with a full-immersion integrated pole liquid cooling device of the utility model; when the anti-leakage sensor 52 senses the coolant and the valve core 341 is closed, a maintenance alarm signal is issued to remind humans to inspect the above-mentioned seal 361 or sealing ring 351 to prevent coolant leakage.

[0057] On the other hand, refer to Fig.11 As shown, the utility model provides a battery pack, including a plurality of fully immersed integrated pole liquid cooling devices stacked in sequence.

[0058] The top surface of the cover plate 7 is provided with a first positioning portion 71, and the bottom surface of the box body 1 is provided with a second positioning portion 11 adapted to the first positioning portion 71, so as to facilitate the stacking and assembly of multiple full-immersion integrated pole liquid cooling devices and prevent deviation after stacking. In the utility model, the first positioning portion 71 is a groove structure, and the second positioning portion 11 is a protrusion structure.

[0059] The box body 1 and the cooling element 3 can be made of metal or plastic.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fully immersed integrated pole liquid cooling device, comprising a box (1), wherein the box (1) houses a plurality of battery cells (2), wherein the battery cells (2) comprise a positive electrode (21) and a negative electrode (22), wherein: The invention also comprises a cooling member (3) arranged above the box body (1), wherein the cooling member (3) and the battery cell (2) are closed to form a plurality of cooling chambers (4), wherein the cooling chambers (4) enclose the positive electrode (21) and the negative electrode (22); the cooling member (3) is provided with a liquid inlet (31), a liquid outlet (32) and a flow guide (33) connecting the various cooling chambers (4).

2. A fully immersed integrated pole liquid cooling device according to claim 1, characterized in that: The cooling element (3) is provided with a limiting ring (35) that wraps the positive electrode (21) and the negative electrode (22), and the internal space of the limiting ring (35) constitutes the cooling chamber (4).

3. A fully immersed integrated pole liquid cooling device according to claim 2, characterized in that: The battery cell (2) is provided with a flange (24), the flange (24) surrounds the positive electrode (21) and the negative electrode (22), and the outer wall of the limiting ring (35) abuts against the inner wall of the flange (24).

4. A fully immersed integrated pole liquid cooling device according to claim 3, characterized in that: The outer wall of the limiting ring (35) is sleeved with a sealing ring (351) that abuts against the inner wall of the flange (24).

5. The fully immersed integrated pole liquid cooling device according to claim 1, characterized in that: The cooling element (3) comprises a stopper (36), wherein the stopper (36) fills the gap between the battery cells (2) and fills the gap between the battery cells (2) and the inner wall of the box body (1).

6. A fully immersed integrated pole liquid cooling device according to claim 5, characterized in that: A sealing component (361) is fixedly connected to the bottom of the stopper portion (36).

7. A fully immersed integrated pole liquid cooling device according to claim 6, characterized in that: The sealing member (361) is provided with a plurality of sealing portions (3611) that abut against the inner wall of the box body (1).

8. A fully immersed integrated pole liquid cooling device according to any one of claims 1 to 7, characterized in that: It also comprises a cover plate (7), an electrical connection plate (8) being provided between the cooling element (3) and the cover plate (7), the electrical connection plate (8) being used to electrically connect each of the battery cells (2).

9. A fully immersed integrated pole liquid cooling device according to claim 8, characterized in that: The top surface of the cover plate (7) is provided with a first positioning portion (71), and the bottom surface of the box body (1) is provided with a second positioning portion (11) adapted to fit the first positioning portion (71).

10. A battery pack, characterized in that: It comprises a plurality of fully immersed integrated pole liquid cooling devices as described in any one of claims 1 to 9 stacked in sequence.

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