Liquid cooling lithium battery box body

Abstract

The utility model provides a liquid cooling lithium battery box body, which comprises a battery pack, the battery pack comprises at least two cross beams, at least two side beams and a liquid cooling plate, the two cross beams are internally provided with cross beam cavities, the cross sections of the two cross beams are L-shaped, one end of the liquid cooling plate is provided with a liquid inlet, a fixed rod is arranged above the liquid inlet, and the fixed rod is connected with the liquid cooling plate. A notch is formed in the position, corresponding to the liquid inlet, of the fixing rod, a fixing rod cavity is formed in the fixing rod, and the liquid inlet is located in the notch; the cross beam cavities and the fixing rod cavities arranged in the cross beams and the fixing rods can be filled with materials for heat dissipation, so that the overall mass of the box body is reduced, the box body is convenient to mount, carry or disassemble, the heat dissipation effect of the battery cells at the inner edges of the box body is good, and the service life of the battery cells is prolonged. And the heat dissipation material filled in the cross beam cavity and the fixed rod cavity can effectively dissipate heat of the battery cells at the inner edge of the battery pack, heat dissipation is uniform, thermal runaway of the battery box body is not easily caused, and potential safety hazards are reduced.

Description

Technical Field

[0001] The utility model relates to the field of lithium ion batteries, in particular to a liquid-cooled lithium battery box. Background Art

[0002] A battery box is a group of batteries consisting of several single cells, a box body, a battery management system and related mounting structural parts. It has a standard battery box structure, battery box monitoring equipment, battery box connectors, battery box environmental control equipment, etc. Existing battery boxes usually use liquid cooling plates for heat dissipation.

[0003] At present, the heat dissipation method of most battery pack modules is through liquid cooling plates, and all boxes are solid metal boxes. The overall mass of the box is large. At the same time, most liquid cooling plates are set at the top or bottom of the box. The heat dissipation effect of the battery cells at the inner edge of the box is poor. Uneven heat dissipation can easily cause thermal runaway of the battery box, posing a safety hazard.

[0004] To this end, we propose a liquid-cooled lithium battery box to solve the above problems. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a liquid-cooled lithium battery box.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A liquid-cooled lithium battery box comprises a battery pack, wherein the battery pack is welded together by two cross beams, two side beams and a liquid cooling plate, wherein a cross beam cavity is provided inside the two cross beams, and the cross sections of the two cross beams are L-shaped, a liquid inlet is provided at one end of the liquid cooling plate, a fixing rod is provided above the liquid inlet, a notch is provided at a position corresponding to the fixing rod and the liquid inlet, a fixing rod cavity is provided inside the fixing rod, and the liquid inlet is located in the notch.

[0008] Further preferably, a support beam is provided between the two cross beams, and the support beam and the two cross beams are welded and fixed.

[0009] Further preferably, a positioning frame is provided between the two cross beams and the two side beams and the liquid cooling plate, and the positioning frame is fixed to the two cross beams, the two side beams and the liquid cooling plate by means of screws.

[0010] Further preferably, a protruding circulation pipeline is provided at the bottom end of the liquid cooling plate, and a plurality of limiting beams are provided at the bottom end of the liquid cooling plate.

[0011] Further preferably, the plurality of limit beams are located on one side of the circulation pipeline, and the spacings between the plurality of limit beams are consistent.

[0012] Further preferably, the fixing rod and the cross beam have the same length, and a heat-conductive structural adhesive coating is applied between the fixing rod and the cross beam.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. In the utility model, the cross beam cavity and the fixing rod cavity provided in the cross beam and the fixing rod can be filled with materials for heat dissipation, thereby reducing the overall mass of the box body and facilitating installation, transportation or disassembly.

[0015] 2. The heat dissipation effect of the battery cells at the inner edge of the box is good. The heat dissipation material filled in the cavity of the beam and the cavity of the fixed rod can effectively dissipate the heat of the battery cells at the inner edge of the battery pack. The heat dissipation is uniform and it is not easy to cause thermal runaway of the battery box, reducing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the battery pack explosion structure;

[0017] Figure 2 It is a schematic diagram of the planar structure of the bottom of the battery pack;

[0018] Figure 3 for Figure 1 A schematic diagram of the enlarged structure in the middle.

[0019] In the figure: 1. battery pack; 2. crossbeam; 3. fixing rod; 4. side beam; 5. liquid cooling plate; 6. support beam; 7. positioning frame; 8. limit beam; 9. circulation pipeline; 10. crossbeam cavity; 11. notch; 12. fixing rod cavity; 13. liquid inlet. DETAILED DESCRIPTION

[0020] Reference Figure 1-3 A liquid-cooled lithium battery box includes a battery pack 1, wherein the battery pack 1 is welded with two cross beams 2, two side beams 4 and a liquid cooling plate 5. The two cross beams 2, two side beams 4 and the liquid cooling plate 5 can be changed according to the size of the battery cell used, and can be suitable for installation of battery packs 1 of different sizes by welding;

[0021] The two beams 2 are provided with a beam cavity 10 inside. The cross-sections of the two beams 2 are L-shaped. The bottom end area of ​​the L-shaped beam 2 is larger, which is more stable during installation or welding and can be easily installed.

[0022] A liquid inlet 13 is provided at one end of the liquid cooling plate 5, and coolant is injected into the liquid cooling plate 5 through the liquid inlet 13. A fixing rod 3 is provided above the liquid inlet 13, and a notch 11 is provided at the fixing rod 3 corresponding to the liquid inlet 13. A fixing rod cavity 12 is provided inside the fixing rod 3. The liquid inlet 13 is located in the crossbeam 2 and the fixing rod 3 in the notch 11. The crossbeam cavity 10 and the fixing rod cavity 12 provided can be filled with materials for heat dissipation, thereby reducing the overall mass of the box, and facilitating installation, transportation or disassembly;

[0023] The heat dissipation effect of the battery cells at the inner edge of the box is good. The heat dissipation material filled in the beam cavity 10 and the fixing rod cavity 12 can effectively dissipate the heat of the battery cells at the inner edge of the battery pack 1. The heat dissipation is uniform and it is not easy to cause thermal runaway of the battery box, reducing safety hazards.

[0024] A support beam 6 is provided between the two cross beams 2. The support beam 6 is machined and can be processed according to the size of the cross beam 2. The support beam 6 supports and fixes between the two cross beams 2, which can improve the overall stability of the battery pack 1. The support beam 6 and the two cross beams 2 are welded and fixed. Fixing by welding is relatively stable and can be suitable for the installation of support beams 6 of all sizes.

[0025] A positioning frame 7 is provided between the two cross beams 2 and the two side beams 4 and the liquid cooling plate 5. The positioning frame 7 can position the cross beams 2 and the side beams 4 at the top of the liquid cooling plate 5, so as to facilitate the installation and fixation of the cross beams 2 and the edges to the liquid cooling plate 5. The positioning frame 7 is fixed to the two cross beams 2, the two side beams 4 and the liquid cooling plate 5 by screws. The screw fixation can facilitate installation and disassembly during subsequent maintenance.

[0026] A protruding circulation pipeline 9 is provided at the bottom end of the liquid cooling plate 5, and the coolant will flow in the circulation pipeline 9 to achieve the cooling effect. A plurality of limiting beams 8 are provided at the bottom end of the liquid cooling plate 5, and the limiting beams 8 will limit the bottom end of the liquid cooling plate 5 and protect the circulation pipeline 9 at the bottom end of the liquid cooling plate 5 at the same time.

[0027] A plurality of limit beams 8 are located on one side of the circulation pipeline 9, and the limit beams 8 are connected to the liquid cooling plate 5 by welding or bolting. The circulation pipeline 9 is located between the liquid cooling plate 5 and the limit beams 8, and the spacing between the plurality of limit beams 8 is consistent, which can effectively improve stability.

[0028] The lengths of the fixing rod 3 and the cross beam 2 are consistent, so that the fixing rod 3 and the cross beam 2 can fit completely together, the cross beam 2 and the fixing rod 3 will not bulge out, and are not easily worn. A thermal conductive structural adhesive coating is applied between the fixing rod 3 and the cross beam 2. The thermal conductive structural adhesive can effectively conduct heat while bonding. At the same time, side seam laser welding is performed on the outside of the fixing rod 3 and the cross beam 2, which can stably fix the fixing rod 3 and the cross beam 2.

Claims

1. A liquid-cooled lithium battery box, comprising a battery pack, wherein the battery pack is welded by two cross beams, two side beams and a liquid cooling plate, characterized in that: A beam cavity is provided inside the two beams, and the cross-section of the two beams is L-shaped. A liquid inlet is provided at one end of the liquid cooling plate, and a fixing rod is provided above the liquid inlet. A notch is provided at the corresponding position of the fixing rod and the liquid inlet, and a fixing rod cavity is provided inside the fixing rod, and the liquid inlet is located in the notch.

2. A liquid-cooled lithium battery box according to claim 1, characterized in that: A support beam is arranged between the two cross beams, and the support beam and the two cross beams are welded and fixed.

3. A liquid-cooled lithium battery box according to claim 2, characterized in that: A positioning frame is provided between the two cross beams, the two side beams and the liquid cooling plate, and the positioning frame is fixed to the two cross beams, the two side beams and the liquid cooling plate by screws.

4. A liquid-cooled lithium battery box according to claim 1, characterized in that: A protruding circulation pipeline is provided at the bottom end of the liquid cooling plate, and a plurality of limiting beams are provided at the bottom end of the liquid cooling plate.

5. A liquid-cooled lithium battery box according to claim 4, characterized in that: The plurality of limit beams are located on one side of the circulation pipeline, and the spacings between the plurality of limit beams are consistent.

6. A liquid-cooled lithium battery box according to claim 1, characterized in that: The fixing rod and the cross beam have the same length, and a heat-conducting structural adhesive coating is applied between the fixing rod and the cross beam.

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