Multi-pole full liquid cooling device and battery pack

Abstract

The utility model provides a multi-pole full liquid cooling device and a battery pack, the multi-pole full liquid cooling device comprises a box body, a plurality of single batteries are arranged in the box body, each single battery comprises a positive electrode and a negative electrode, the multi-pole full liquid cooling device further comprises a cooling piece arranged above the box body, the cooling piece and the single batteries are closed to form a plurality of cooling cavities, and the cooling cavities are communicated with the box body. The cooling chamber wraps the positive electrode and the negative electrode; the cooling piece is provided with a liquid inlet, a liquid outlet and a flow guide channel communicating with the cooling cavities. The cooling piece is provided with an electric connecting piece, the electric connecting piece comprises an electric connecting plate, a spring and a floating conductive column, the cooling piece is provided with a receding groove, the floating conductive column is clamped in the receding groove, and the spring is arranged between the floating conductive column and the electric connecting plate, so that the volume of the cooling cavity is reduced through the structure, the use of cooling liquid is greatly reduced, and the manufacturing cost is reduced; and after the cooling piece is buckled with the box body, the floating conductive column is kept to abut against the positive electrode and the negative electrode, so that the battery monomers are electrically connected.

Description

Technical Field

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

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

[0003] Chinese patent document CN117790973A discloses a method of cooling batteries using liquid cooling, which cools the battery cells by completely immersing them in coolant. This requires a large amount of coolant to cool the positive and negative electrodes of the battery cells, 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 multi-pole full liquid cooling device and a battery pack to solve the problems mentioned in the above background technology section.

[0005] The utility model is achieved through the following technical solutions:

[0006] A multi-pole full liquid cooling device comprises a housing housing a plurality of battery cells, each of which comprises a positive electrode and a negative electrode; and a cooling element disposed above the housing, wherein the cooling element and the battery cells are closed to form a plurality of cooling chambers, each of which encloses the positive and negative electrodes.

[0007] The cooling element is provided with a liquid inlet, a liquid outlet and a flow channel connecting the various cooling chambers;

[0008] The cooling member is provided with an electrical connector, which includes an electrical connection plate, a spring and the floating conductive column. The cooling member is provided with a clearance groove, the floating conductive column is clamped in the clearance groove, and the spring is arranged between the floating conductive column and the electrical connection plate.

[0009] Furthermore, the floating conductive column is provided with a conductive wire connected to the electrical connection plate.

[0010] Furthermore, the recess is provided with a necking portion, and the floating conductive column is provided with a limiting portion abutting against the necking portion.

[0011] Furthermore, the cooling member is provided with a limiting ring that wraps the positive electrode and the negative electrode, and the internal space of the limiting ring constitutes the cooling chamber.

[0012] 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.

[0013] Furthermore, a sealing ring is sleeved on the outer periphery of the limiting ring and abuts against the inner wall of the flange.

[0014] Furthermore, the cooling member includes a stopper portion, which fills the gaps between the battery cells and the gaps between the battery cells and the side walls of the box body.

[0015] Furthermore, a sealing member is fixedly connected to the bottom of the stop portion.

[0016] Furthermore, it also includes a cover plate, which closes the upper opening of the cooling element, the top surface of the cover plate is provided with a first positioning portion, and the bottom surface of the box body is provided with a second positioning portion adapted to the first positioning portion.

[0017] On the other hand, the present invention provides a battery pack comprising a plurality of multi-pole full liquid cooling devices stacked in sequence.

[0018] The beneficial effects of the present utility model are as follows: a multi-pole full liquid cooling device comprises a box body, wherein the box body has multiple battery cells built therein, the battery cells comprising positive electrodes and negative electrodes, and further comprises a cooling member arranged above the box body, the cooling member and the battery cells are closed to form a plurality of cooling chambers, the cooling chambers wrapping the positive electrodes and negative electrodes; the cooling member is provided with a liquid inlet, a liquid outlet and a guide channel connecting each cooling chamber; the cooling member is provided with an electrical connector, wherein the electrical connector comprises an electrical connecting plate, a spring and the floating conductive column, the cooling member is provided with a clearance groove, the floating conductive column is clamped in the clearance groove, the spring is arranged between the floating conductive column and the electrical connecting plate, the volume of the cooling chamber is reduced through the above structure, the use of coolant is greatly reduced, the manufacturing cost is reduced, and after the cooling member is buckled with the box body, the floating conductive column remains in contact with the positive electrode and the negative electrode, thereby electrically connecting each battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the first embodiment of the present utility model.

[0020] Figure 2 for Figure 1 Horizontal section along AA.

[0021] Figure 3 for Figure 1 Vertical section along BB.

[0022] Figure 4This is an exploded view of the first embodiment of the present utility model.

[0023] Figure 5 This is another exploded view of the first embodiment of the present invention.

[0024] Figure 6 It is a three-dimensional diagram of the first embodiment of the utility model.

[0025] Figure 7 for Figure 6 Horizontal section along AA.

[0026] Figure 8 for Figure 6 Vertical section along BB.

[0027] Figure 9 This is an exploded view of the second embodiment of the present utility model.

[0028] Figure 10 This is another exploded view of the second embodiment of the present invention.

[0029] Figure 11 It is a three-dimensional diagram of the battery pack of the present invention.

[0030] The above drawings include the following reference numerals:

[0031] 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; 34. Emergency flow channel; 341. Valve core; 35. Limiting ring; 351. Sealing ring; 36. Stopper; 361. Sealing part; 3611. Sealing part; 37. Make way groove; 371. Narrowing part; 4. Cooling chamber; 5. Emergency chamber; 51. Temperature sensor; 52. Anti-leakage sensor; 7. Cover plate; 71. First positioning part; 8. Electrical connector; 81. Floating conductive column; 811. Limiting part; 82. Electrical connection plate; 821. Positive electrode connecting wire; 822. Negative electrode connecting wire; 83. Spring; 84. Conductive wire. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention 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 present invention.

[0033] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, the terms "first" and "second" may explicitly or implicitly include one or more of the features.

[0034] Research and testing have shown that during the charging or discharging process, 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 is 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.

[0035] The present invention proposes a fully immersed liquid cooling device for a pole, which includes a box body 1, in which a plurality of battery cells 2 are built. 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 present invention reduces the amount of coolant used by providing a cooling member 3.

[0036] The cooling element 3 is disposed above the housing 1. The cooling element 3 and the battery cells 2 are closed to form several cooling chambers 4 and an emergency chamber 5. The cooling chambers 4 enclose the positive and negative electrodes 21 and 22. The cooling element 3 is provided with a liquid inlet 31 and a liquid outlet 32, each of which is connected to a flow channel 33 of each cooling chamber 4. Coolant flows in through the liquid inlet 31, then flows through the cooling chambers 4 to cool the positive and negative electrodes 21 and 22, before finally flowing out through the liquid outlet 32.

[0037] The cooling member 3 can completely wrap the battery body 23, or it 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.

[0038] When the emergency chamber 5 is present, the cooling element 3 is provided with an emergency flow channel 34 connecting the flow guide 33 and the emergency chamber 5. The emergency flow channel 34 is provided with a valve core 341. A temperature sensor 51 is located within the emergency chamber 5. 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 normally closed. When the temperature sensor 51 detects a rapid increase in the internal temperature of the emergency chamber 5, indicating that the battery cell 2 has experienced thermal runaway, the valve core 341 is opened, allowing the coolant to enter the emergency chamber 5 through the emergency flow channel 34, thereby cooling the battery cell 2 and preventing thermal runaway.

[0039] 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 achieve rapid cooling of the battery cell 2.

[0040] The cooling element 3 also includes a cooling circulation mechanism (not shown) that drives the coolant through the cooling chamber 4 for circulation. Specifically, the coolant is introduced through the liquid inlet 31, passes through the flow guide 33 and the cooling chamber 4, and ultimately returns to the cooling circulation mechanism through the liquid outlet 32, thereby achieving reuse of the coolant. The liquid inlet 31 and the liquid outlet 32 ​​are arranged on the same side of the cooling element 3, facilitating their connection to the cooling circulation mechanism.

[0041] The cooling circulation mechanism belongs to the existing technology, and the cooling circulation mechanism can use a circulation pump or the like to circulate the coolant.

[0042] 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. In addition, the reduction in the total amount of coolant allows 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.

[0043] The cooling element 3 is provided with an electrical connector 8, which includes floating conductive posts 81 that abut the positive electrode 21 and the negative electrode 22. This ensures that when the cooling element 3 is fastened to the housing 1, the floating conductive posts 81 maintain contact with both the positive and negative electrodes 21, 22, thereby connecting the circuits of multiple battery cells 2 in series. Furthermore, each floating conductive post 81 individually abuts the positive or negative electrode 21, 22. Therefore, even if the positive and negative electrodes 21, 22 differ in height during processing or assembly, the floating conductive posts 81 and the positive or negative electrodes 21, 22 remain electrically connected.

[0044] Specifically, the electrical connector 8 includes an electrical connection plate 82, a spring 83 and a floating conductive column 81. The cooling member 3 is provided with a clearance groove 37. The floating conductive column 81 is clamped in the clearance groove 37. The spring 83 is provided between the floating conductive column 81 and the electrical connection plate 82, so that the floating conductive column 81 can be floatingly connected in the clearance groove 37, and one end of the floating conductive column 81 extends out of the clearance groove 37 and abuts the positive electrode 21 or the negative electrode 22.

[0045] The electrical connection plate 82 further includes a positive electrode connection wire 821 and a negative electrode connection wire 822 extending laterally from the cooling element 3.

[0046] The liquid inlet 31 and the liquid outlet 32 ​​and the positive electrode connection line 821 and the negative electrode connection line 822 are respectively arranged on both sides of the symmetrical plane of the cooling member 3, so that the liquid inlet 31 and the liquid outlet 32, the positive electrode connection line 821 and the negative electrode connection line 822 do not interfere with each other when connected to external components.

[0047] The clearance groove 37 is provided with a necked portion 371, and the floating conductive column 81 is provided with a limiting portion 811 abutting the necked portion 371, so that the floating conductive column 81 cannot escape from the clearance groove 37 in the downward direction, and the floating conductive column 81 is pressed by the electrical connection plate 82, so that the floating conductive column 81 can only float in the clearance groove 37.

[0048] The floating conductive column 81 is provided with a conductive wire 84 connected to the electrical connection plate 82 . The rope-shaped conductive wire 84 ensures that the circuit with the electrical connection plate 82 remains open when the floating conductive column 81 is extended or retracted to any position.

[0049] Reference Figures 1 to 5 The first embodiment of the cooling element 3 is shown. The specific structure of this embodiment is as follows:

[0050] In the first embodiment, the cooling member 3 is provided with a retaining ring 35 that wraps around the positive electrode 21 and the negative electrode 22. The interior space of the retaining ring 35 constitutes the 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.

[0051] 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 the inner wall of the flange 24, thereby forming a sealed cooling chamber 4.

[0052] 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 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.

[0053] Reference Figures 6 to 10 The second embodiment of the cooling element 3 is shown. The specific structure of this embodiment is as follows:

[0054] 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 walls of the box body 1 .

[0055] To prevent coolant from leaking into the emergency chamber 5, a rubber seal 361 is secured to the bottom of the stopper 36. The stopper 36 can be glued to the seal 361. Alternatively, (not shown) a slot can be provided in the seal 361, the stopper inserted into the slot, and glue added to the slot to glue the stopper 36 to the seal 361. The stopper 36 abuts the battery cell 2 and the inner wall of the housing 1 through the seal 361.

[0056] Preferably, the sealing member 361 is provided with a plurality of sealing portions 3611 that abut against the inner wall of the box body 1 and the battery cells 2 , thereby further improving the sealing effect.

[0057] The housing 1 further includes a cover plate 7, which is positioned above the cooling element 3. The cover plate 7 is removably connected to the cooling element 3 or the housing 1 via screws (not shown). The cover plate 7 and the cooling element 3 are closed to form an installation chamber, within which an electrical connector 8 is located. The removable connection between the cover plate 7 and the cooling element 3 or the housing 1 facilitates repair of the electrical connector 8 if it becomes damaged.

[0058] 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 .

[0059] The coolant can be electronic fluorinated liquid, such as hydrofluoroether HFE, hydrofluoroolefin HFO, silicone oil, etc.

[0060] 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.

[0061] The anti-leakage sensor 52 can be a humidity sensor or a liquid level sensor. When the anti-leakage sensor 52 is 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 is 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.

[0062] 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 vehicle equipped with a pole full immersion liquid cooling device of the present invention; when the anti-leakage sensor 52 senses the coolant and the valve core 341 is closed, a maintenance alarm signal is issued to remind people to inspect the above seal 361 or sealing ring 351 to prevent coolant leakage.

[0063] On the other hand, refer to Figure 11 As shown, the utility model provides a battery pack, including a plurality of electrode full immersion liquid cooling devices stacked in sequence.

[0064] The top surface of the cover plate 7 is provided with a first positioning portion 71, and the bottom surface of the housing 1 is provided with a second positioning portion 11 adapted to the first positioning portion 71. This facilitates the stacking and assembly of multiple fully immersed integrated pole liquid cooling devices and prevents them from shifting after stacking. In the present invention, the first positioning portion 71 is a groove structure, and the second positioning portion 11 is a raised structure.

[0065] The box body 1 and the cooling element 3 can both be made of metal or plastic.

[0066] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A multi-pole full liquid cooling device, comprising a housing (1), wherein the housing (1) houses a plurality of battery cells (2), wherein the battery cells (2) comprise a positive electrode (21) and a negative electrode (22), and wherein: It also includes a cooling member (3) disposed 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), and the cooling chambers (4) enclose the positive electrode (21) and the negative electrode (22); The cooling element (3) is provided with a liquid inlet (31), a liquid outlet (32), and a flow channel (33) communicating with each cooling chamber (4); The cooling member (3) is provided with an electrical connector (8), and the electrical connector (8) includes an electrical connection plate (82), a spring (83) and a floating conductive column (81). The cooling member (3) is provided with a clearance groove (37), and the floating conductive column (81) is clamped in the clearance groove (37). The spring (83) is provided between the floating conductive column (81) and the electrical connection plate (82).

2. The multi-pole full liquid cooling device according to claim 1, characterized in that: The floating conductive column (81) is provided with a conductive wire (84) connected to the electrical connection plate (82).

3. The multi-pole full liquid cooling device according to claim 1, characterized in that: The relinquishing groove (37) is provided with a constricted portion (371), and the floating conductive column (81) is provided with a limiting portion (811) abutting against the constricted portion (371).

4. The multi-pole full liquid cooling device according to any one of claims 1 to 3, 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).

5. The multi-pole full liquid cooling device according to claim 4, 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).

6. The multi-pole full liquid cooling device according to claim 5, characterized in that: 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).

7. The multi-pole full liquid cooling device according to any one of claims 1 to 3, characterized in that: The cooling member (3) comprises a stopper (36), and the stopper (36) fills the gaps between the battery cells (2) and the gaps between the battery cells (2) and the side walls of the box body (1).

8. The multi-pole full liquid cooling device according to claim 7, characterized in that: A sealing member (361) is fixedly connected to the bottom of the stop portion (36).

9. The multi-pole full liquid cooling device according to claim 1, characterized in that: The box body (1) further comprises a cover plate (7) which closes the upper opening of the cooling element (3); a first positioning portion (71) is provided on the top surface of the cover plate (7); and a second positioning portion (11) adapted to fit the first positioning portion (71) is provided on the bottom surface of the box body (1).

10. A battery pack, characterized in that: The invention comprises a plurality of multi-pole full liquid cooling devices as claimed in any one of claims 1 to 9 stacked in sequence.

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