Battery pack

Abstract

The utility model provides a battery pack which comprises a box body, a battery pack cover and a battery pack body, the battery cell module comprises a first battery cell group and a second battery cell group, and both the first battery cell group and the second battery cell group are accommodated in the box body; the air cooling module comprises an air inlet pipe, an air outlet pipe and a fan, one end of the air inlet pipe is communicated with the outside of the box body, and the other end of the air inlet pipe is communicated with the inside of the box body; one end of the air outlet pipe is communicated with the inside of the box body, and the other end of the air outlet pipe is communicated with the outside of the box body; the fan is arranged at the air inlet pipe and / or the air outlet pipe, and when the fan rotates, air is fed into the box body through the air inlet pipe, and air is discharged out of the box body through the air outlet pipe at the same time; and the liquid cooling module comprises a liquid cooling plate which is positioned between the first battery cell group and the second battery cell group. According to the battery pack disclosed by the utility model, the air cooling module and the liquid cooling module are simultaneously arranged, so that the battery cell module can be better cooled, multiple surfaces of the battery cell can be cooled, the cooling effect is good, and the cooling efficiency is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a battery pack. Background Art

[0002] Currently, only about 1 / 6 of the cylindrical surface of each cylindrical cell in the battery is in contact with the cold plate for heat dissipation, resulting in limited heat dissipation effect. Especially under high-rate charge and discharge conditions, the temperature of the cell pole electrical connectors is high and the temperature difference within the single cell is large.

[0003] In view of this, it is necessary to improve the existing battery pack to solve the above problems. Utility Model Content

[0004] The purpose of the present utility model is to provide a battery pack to solve the problem of limited heat dissipation effect of the battery cells of the existing battery pack.

[0005] To achieve the above objectives, the present invention provides a battery pack, comprising:

[0006] Box;

[0007] The battery cell module includes a first battery cell group and a second battery cell group, both of which are accommodated in the box;

[0008] The air cooling module includes an air inlet pipe, an air outlet pipe, and a fan. One end of the air inlet pipe is connected to the outside of the box, and the other end is connected to the inside of the box; one end of the air outlet pipe is connected to the inside of the box, and the other end is connected to the outside of the box;

[0009] The fan is provided at the air inlet pipe and / or the air outlet pipe. When the fan rotates, air is drawn into the box through the air inlet pipe and air is discharged to the outside of the box through the air outlet pipe.

[0010] The liquid cooling module includes a liquid cooling plate located between the first battery cell group and the second battery cell group.

[0011] As a further improvement of the present invention, the air cooling module also includes an air inlet structure connected to the air inlet pipe and an air outlet structure connected to the air outlet pipe. The air inlet structure is provided with an upper air inlet toward the first battery cell group and a lower air inlet toward the second battery cell group. The air outlet structure is provided with an upper air outlet toward the first battery cell group and a lower air outlet toward the second battery cell group.

[0012] As a further improvement of the present invention, the air inlet structure is provided with an air inlet support member toward the battery cell module, the air outlet structure is provided with an air outlet support member toward the battery cell module, and both ends of the liquid cooling plate are clamped between the air inlet support member and the air outlet support member.

[0013] As a further improvement of the present invention, along the height direction, if the air inlet pipe is located above the air inlet support, the air outlet pipe is located below the air outlet support; if the air inlet pipe is located below the air inlet support, the air outlet pipe is located above the air outlet support.

[0014] As a further improvement of the present invention, the air-cooling module also includes a battery cell fixing frame and two wind shields arranged at one end of the battery cell module away from the liquid cooling plate. The wind shield, the battery cell fixing frame, the air inlet structure and the air outlet structure are supported and surrounded to form a cooling space, and the battery cell module is accommodated in the cooling space.

[0015] As a further improvement of the present invention, the battery cell module includes multiple battery cells, the first battery cell group and the second battery cell group are both composed of battery cells, each battery cell is provided with a battery cell explosion-proof valve at one end away from the liquid cooling plate, the box body is provided with a box explosion-proof valve, and the battery cell fixing frame is provided with a clearance gap for exposing the battery cell explosion-proof valve.

[0016] As a further improvement of the present invention, the battery pack also includes a thermally conductive adhesive layer arranged on the upper and lower sides of the liquid cooling plate, an insulating layer arranged on the side of the thermally conductive adhesive layer away from the liquid cooling plate, and an electrical connector arranged on the insulating layer away from the thermally conductive adhesive layer. The electrical connector close to the first battery cell group is used to connect the electrodes of the first battery cell group, and the electrical connector close to the second battery cell group is used to connect the electrodes of the second battery cell group.

[0017] As a further improvement of the present invention, the battery pack also includes a potting part arranged on the upper and lower sides of the liquid cooling plate, and the potting part is formed with an avoidance hole for the first battery cell group or the second battery cell group to pass through, and the potting part is filled with a potting material connected to the insulation layer and the battery cell module.

[0018] As a further improvement of the present invention, the potting component is provided with a plurality of potting spoiler protrusions protruding toward a side away from the liquid cooling plate.

[0019] As a further improvement of the present invention, a cooling channel is provided in the liquid cooling plate, and the liquid cooling module further includes a liquid inlet pipe and a liquid outlet pipe connected to both ends of the cooling channel, and the liquid inlet pipe and the liquid outlet pipe protrude outside the box.

[0020] The beneficial effects of the present invention are as follows: the battery pack of the present invention is provided with an air cooling module and a liquid cooling module at the same time, which can achieve better cooling of the battery cell module and can achieve cooling of multiple sides of the battery cell, with good cooling effect and high cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of the battery pack of the present utility model;

[0023] Figure 2 This is a schematic diagram of the exploded structure of the battery pack of the present utility model;

[0024] Figure 3 It is a schematic cross-sectional structure diagram of the battery pack of the present utility model;

[0025] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure of area A in the middle;

[0026] Figure 5 This is a schematic structural diagram of the potting component of the battery pack of the present invention;

[0027] Figure 6 It is a structural schematic diagram of the air outlet structure of the battery pack of the present utility model.

[0028] 1. Battery pack; 2. Battery pack; 3. Battery pack; 4. Battery pack; 5. Battery pack; 6. Battery pack; 7. Battery pack; 8. Battery pack explosion-proof valve; 9. Battery pack module; 100. Battery pack; 1. Battery pack; 11. Battery pack explosion-proof valve; 2. Battery cell module; 21. First battery cell group; 22. Second battery cell group; 23. Battery cell; 231. Battery cell explosion-proof valve; 3. Air cooling module; 31. Air inlet duct; 311. Filter element; 32. Air outlet duct; 33. Fan; 34. Air inlet structure; 341. Upper air inlet; 342. Lower air inlet; 343. Air inlet support; 35. Air outlet structure; 351. Air outlet; 352. Lower air outlet; 353. Air outlet support; 36. Battery cell fixing frame; 361. Clearance; 37. Wind shield; 4. Liquid cooling module; 41. Liquid cooling plate; 411. Liquid inlet pipe; 412. Liquid outlet pipe; 5. Thermal conductive adhesive layer; 6. Insulation layer; 7. Electrical connector; 8. Potting member; 9. Support structure. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] like Figures 1 to 6 As shown, the battery pack 100 of the present invention includes a box body 1, a battery cell module 2, an air cooling module 3, a liquid cooling module 4, a thermal conductive adhesive layer 5, an insulating layer 6, an electrical connector 7 arranged on the insulating layer 6 away from the thermal conductive adhesive layer 5, a potting component 8, and a support structure 9.

[0033] The box body 1 is provided with a box body explosion-proof valve 11 .

[0034] In this embodiment, the battery cell module 2 includes a first battery cell group 21 and a second battery cell group 22 , and both are accommodated in the box 1 .

[0035] Furthermore, the cell module 2 includes multiple cells 23, with the first cell group 21 and the second cell group 22 both consisting of cells 23. In this embodiment, each cell 23 has a positive electrode, a negative electrode, and a separator surrounding the positive electrode. The positive and negative electrodes are both located at the same end of the cell 23, and the separator is used to isolate the positive and negative electrodes to prevent short circuits. The cell 23 is provided with a cell explosion-proof valve 231 at the end away from the positive and negative electrodes. The first cell group 21 and the second cell group 22 are provided with electrodes at opposite ends thereof.

[0036] In addition, the electrical connector 7 is installed on the positive electrode and / or the negative electrode of the battery cell 23 to achieve electrical connection between multiple battery cells 23 on the same layer. The electrical connector 7 can be installed by welding.

[0037] The electrical connector 7 close to the first battery cell group 21 is used to connect to the electrodes of the first battery cell group 21 , and the electrical connector 7 close to the second battery cell group 22 is used to connect to the electrodes of the second battery cell group 22 .

[0038] In this embodiment, the liquid cooling module 4 includes a liquid cooling plate 41, a liquid inlet pipe 411, and a liquid outlet pipe 412. The liquid cooling plate 41 is located between the first battery cell group 21 and the second battery cell group 22. Furthermore, the liquid cooling plate 41 is located between the electrodes of the battery cells 23 on both sides.

[0039] The liquid cooling plate 41 is provided with a cooling channel, with a liquid inlet pipe 411 and a liquid outlet pipe 412 communicating with both ends of the cooling channel. The liquid inlet pipe 411 and the liquid outlet pipe 412 protrude from the housing 1. In this embodiment, the liquid cooling module 4 provides contact heat dissipation for the upper and lower layers of battery cells 23, effectively reducing the high temperatures at the positive and negative electrodes of the battery cells 23 during high-rate charge and discharge.

[0040] In this embodiment, the thermally conductive adhesive layer 5 is disposed on the upper and lower sides of the liquid cooling plate 41 for direct contact with the liquid cooling plate for heat conduction and also for fixing the plate.

[0041] The insulating layer 6 is disposed on the side of the thermally conductive adhesive layer 5 away from the liquid cooling plate 41 to prevent the positive and negative electrodes of the battery cells 23 from electrically contacting the liquid cooling plate 41 and causing a short circuit.

[0042] like Figure 5 As shown, the potting member 8 is disposed on the upper and lower sides of the liquid cooling plate 41. Specifically, the potting member 8 is formed with an escape hole 81 for the first battery cell group 21 or the second battery cell group 22 to pass through. The potting member 8 is formed with a potting groove filled with a potting material 82 that is connected to the insulating layer 6 and the battery cell module 2.

[0043] In this embodiment, the upper part of the avoidance hole 81 is convex and the lower part is concave. There are limiting surfaces 84 and matching surfaces 85 on the concave position of the lower part around the avoidance hole 81. The limiting surface 84 limits the installation direction position of the potting groove in the battery cell 23. The matching surface 85 cooperates with the battery cell 23 and an interference fit can be adopted to make the installation tighter.

[0044] In addition, the protrusion of the avoidance hole 81 not only limits the position but also expands the contact area with the battery cell 23, thereby improving the liquid cooling effect.

[0045] Specifically, potting material 82 fills the gaps between the positive electrode of battery cell 23, the separator, and the electrical connector 7. Potting material 82 can be made of a thermally conductive adhesive material with a certain degree of fluidity and good thermal conductivity, such as a thermally conductive structural adhesive or thermally conductive gel. This increases the heat dissipation area between the positive and negative terminals of battery cell 23 and the electrical connector 7, providing both thermal conductivity and adhesion. Potting material 82 seals the electrical connector 7, preventing direct contact with dust caused by air cooling. Air cooling also dissipates heat from the electrical connector 7.

[0046] In this embodiment, the potting member 8 is provided with a plurality of potting spoiler protrusions 83 extending toward the side away from the liquid cooling plate 41. The potting spoiler protrusions 83 not only increase the spoiler of the cooling air on the sides of the battery cells 23, but also increase the heat dissipation area and heat dissipation effect of the cooling air heat transfer path.

[0047] like Figure 2 and Figure 6 As shown, in this embodiment, the air cooling module 3 includes an air inlet pipe 31, an air outlet pipe 32, a fan 33, an air inlet structure 34 connected to the air inlet pipe 31, an air outlet structure 35 connected to the air outlet pipe 32, a battery cell fixing frame 36 arranged at the end of the battery cell module 2 away from the liquid cooling plate 41, and two wind shields 37.

[0048] The windshield 37, the cell holder 36, the air inlet structure 34, and the air outlet structure 35 are arranged to form a cooling space, and the cell module 2 is accommodated in the cooling space. The support structure 9 is arranged below the cell holder 39 and located on the bottom plate of the box body 1 to support the cooling space.

[0049] In this embodiment, two wind shields 37 are located on both sides of the cooling space and are fixedly connected to the air inlet structure 34, the air outlet structure 35 and the upper and lower battery cell fixing frames 36. The connection method can be gluing or bolting.

[0050] In this embodiment, a cell explosion-proof valve 231 is provided at one end of each cell 23 away from the liquid cooling plate 41, and a clearance gap 361 is provided on the cell fixing frame 36 for exposing the cell explosion-proof valve 231. The gas generated when the cell 23 thermally runs away can pass through the clearance gap 361 as an exhaust channel and then be discharged through the box explosion-proof valve 11.

[0051] Among them, one end of the air inlet pipe 31 is connected to the outside of the box body 1, and the other end is connected to the inside of the box body 1; one end of the air outlet pipe 32 is connected to the inside of the box body 1, and the other end is connected to the outside of the box body 1. The air inlet pipe 31 and the air outlet pipe 32 are both supported by the bracket. The bracket can be installed on the air inlet structure 34 and the air outlet structure 35 by bonding or welding.

[0052] Importantly, the fan 33 is located at the air inlet duct 31 and / or the air outlet duct 32. That is, when the fan 33 is located at the air inlet duct 31, it can operate in blower mode; when the fan 33 is located at the air outlet duct 32, it can operate in exhaust fan mode. When the fan 33 is located at both the air inlet duct 31 and the air outlet duct 32, one operates in blower mode and the other in exhaust fan mode. When the fan 33 rotates, air is drawn into the interior of the housing 1 through the air inlet duct 31 and simultaneously exhausted to the outside of the housing 1 through the air outlet duct 32. In this embodiment, the fan 33 is located at the air outlet duct 32.

[0053] In this embodiment, the air inlet structure 34 is provided with an upper air inlet 341 toward the first battery cell group 21 and a lower air inlet 342 toward the second battery cell group 22, and the air outlet structure 35 is provided with an upper air outlet 351 toward the first battery cell group 21 and a lower air outlet 352 toward the second battery cell group 22.

[0054] In this embodiment, the air inlet structure 34 is provided with an air inlet support 343 facing the battery cell module 2, and the air outlet structure 35 is provided with an air outlet support 353 facing the battery cell module 2. The ends of the liquid cooling plate 41 are clamped between the air inlet support 343 and the air outlet support 353, thus dividing the cooling space into upper and lower parts by the liquid cooling plate 41. The contact surface between the two parts can be sealed with a thermally conductive adhesive layer.

[0055] In this embodiment, along the height direction of the battery pack 100, if the air inlet duct 31 is located above the air inlet support 343, the air outlet duct 32 is located below the air outlet support 353; if the air inlet duct 31 is located below the air inlet support 343, the air outlet duct 32 is located above the air outlet support 353, so that the air can flow fully in the cooling space and the air volume is more uniform.

[0056] Combine Figure 1 As shown, the ends of the air inlet duct 31 and the air outlet duct 32, away from the battery module 2, protrude from the exterior of the housing 1. Filters 311 are provided at the ends of the air inlet duct 31 and the air outlet duct 32. The filter 311 includes a dust cover, a filter hole, and a mounting hole. The dust cover partially blocks dust, the filter hole further filters impurities, and the mounting hole is used to secure the filter 311 to the air inlet duct 31 and the air outlet duct 32. The filter 311 filters the air entering the battery pack 100 while effectively preventing dust from naturally falling into the air inlet duct 31 and the air outlet duct 32.

[0057] In this embodiment, the air cooling module 3 cools the sides of the battery cells 23, ensuring a more uniform temperature across the individual battery cells 23. When the maximum temperature of the battery cells 23 within the battery pack 100 is low, only the fan 33 is activated for air cooling. When the maximum temperature of the battery cells 23 within the battery pack 100 is high, both air and liquid cooling can be activated simultaneously. Because air cooling is less efficient than liquid cooling, liquid cooling is only activated when a greater cooling effect is required, resulting in greater energy savings.

[0058] The battery pack of the present invention is provided with an air cooling module 3 and a liquid cooling module 4 at the same time, which can achieve better cooling of the battery cell module 2 and can achieve cooling of multiple sides of the battery cell 23, with good cooling effect and high cooling efficiency.

[0059] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The above embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the concept of the present invention, and these variations and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A battery pack, characterized in that: include: Box (1); A battery cell module (2) comprises a first battery cell group (21) and a second battery cell group (22), both of which are accommodated in the box (1); The air cooling module (3) comprises an air inlet pipe (31), an air outlet pipe (32), and a fan (33); one end of the air inlet pipe (31) is in communication with the outside of the box (1), and the other end is in communication with the inside of the box (1); one end of the air outlet pipe (32) is in communication with the inside of the box (1), and the other end is in communication with the outside of the box (1); The fan (33) is arranged at the air inlet pipe (31) and / or the air outlet pipe (32). When the fan (33) rotates, air is drawn into the interior of the box (1) through the air inlet pipe (31) and air is discharged to the outside of the box (1) through the air outlet pipe (32). A liquid cooling module (4) comprises a liquid cooling plate (41) located between the first battery cell group (21) and the second battery cell group (22).

2. The battery pack according to claim 1, wherein: The air cooling module (3) further comprises an air inlet structure (34) in communication with the air inlet pipe (31) and an air outlet structure (35) in communication with the air outlet pipe (32); the air inlet structure (34) is provided with an upper air inlet (341) facing the first battery cell group (21) and a lower air inlet (342) facing the second battery cell group (22); the air outlet structure (35) is provided with an upper air outlet (351) facing the first battery cell group (21) and a lower air outlet (352) facing the second battery cell group (22).

3. The battery pack according to claim 2, wherein: The air inlet structure (34) is provided with an air inlet support member (343) toward the battery cell module (2), and the air outlet structure (35) is provided with an air outlet support member (353) toward the battery cell module (2), and both ends of the liquid cooling plate (41) are clamped between the air inlet support member (343) and the air outlet support member (353).

4. The battery pack according to claim 3, wherein: In the height direction, if the air inlet pipe (31) is located above the air inlet support (343), the air outlet pipe (32) is located below the air outlet support (353); if the air inlet pipe (31) is located below the air inlet support (343), the air outlet pipe (32) is located above the air outlet support (353).

5. The battery pack according to claim 3, wherein: The air cooling module (3) further comprises a cell fixing frame (36) and two wind shields (37) arranged at one end of the cell module (2) away from the liquid cooling plate (41); the wind shields (37), the cell fixing frame (36), the air inlet structure (34) and the air outlet structure (35) are arranged to form a cooling space, and the cell module (2) is accommodated in the cooling space.

6. The battery pack according to claim 5, wherein: The battery module (2) includes a plurality of battery cells (23), the first battery cell group (21) and the second battery cell group (22) are both composed of battery cells (23), and a battery cell explosion-proof valve (231) is provided at one end of each battery cell (23) away from the liquid cooling plate (41), the box body (1) is provided with a box body explosion-proof valve (11), and the battery cell fixing frame (36) is provided with a clearance notch (361) for exposing the battery cell explosion-proof valve (231).

7. The battery pack according to claim 1, wherein: The battery pack (100) further comprises a heat-conducting adhesive layer (5) arranged on the upper and lower sides of the liquid cooling plate (41), an insulating layer (6) arranged on the side of the heat-conducting adhesive layer (5) away from the liquid cooling plate (41), and an electrical connector (7) arranged on the insulating layer (6) away from the heat-conducting adhesive layer (5), wherein the electrical connector (7) close to the first battery cell group (21) is used to connect the electrodes of the first battery cell group (21), and the electrical connector (7) close to the second battery cell group (22) is used to connect the electrodes of the second battery cell group (22).

8. The battery pack according to claim 7, wherein: The battery pack (100) further includes a potting member (8) disposed on the upper and lower sides of the liquid cooling plate (41), wherein the potting member (8) is formed with an avoidance hole (81) for the first battery cell group (21) or the second battery cell group (22) to pass through, and the potting member (8) is filled with a potting material (82) connected to the insulating layer (6) and the battery cell module (2).

9. The battery pack according to claim 8, wherein: The potting component (8) is provided with a plurality of potting spoiler protrusions (83) protruding toward a side away from the liquid cooling plate (41).

10. The battery pack according to claim 1, wherein: A cooling channel is provided in the liquid cooling plate (41), and the liquid cooling module (4) further comprises a liquid inlet pipe (411) and a liquid outlet pipe (412) connected to both ends of the cooling channel, wherein the liquid inlet pipe (411) and the liquid outlet pipe (412) protrude outside the box (1).

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