Liquid collection and distribution chamber

Abstract

The invention discloses a cold and hot integrated liquid collecting device, and relates to the technical field of new energy automobile heat management and regulation systems, the cold and hot integrated liquid collecting device comprises a collecting chamber, an inner cavity of the collecting chamber is fixedly connected with a core body, the top of the collecting chamber is fixedly communicated with a medium pipe, and the top of the medium pipe is fixedly communicated with a pressing plate; according to the cold and hot integrated high-strength cavity, the contact area of cooling liquid at the lower position of the medium flow channel chamber and the core body is increased through the advection track mechanism, the heat absorption capacity is increased, then the cooling liquid at the lower position in the medium flow channel chamber is pushed through the transverse pushing unit, and the cooling liquid at the lower position in the medium flow channel chamber is pushed through the transverse pushing unit; and therefore, the heat exchange uniformity is improved.

Description

Technical Field

[0001] The invention relates to a liquid collecting or liquid separating cavity of a battery module. Background Art

[0002] Compared with traditional dry batteries and fuel cells, new energy lithium batteries have excellent characteristics such as good safety, high energy storage density, and portability. They have been widely used in various electronic products such as modern mobile phones and computers. The lithium battery cells currently used are mainly composed of a shell, an electrolyte solution placed in the shell, and a battery cell. The top of the lithium battery cell is provided with a positive electrode and a negative electrode. In the existing technology, the heat dissipation of the battery is basically through air cooling, water cooling or refrigerant direct cooling, but these cooling methods are all indirect heat exchange and their heat exchange efficiency is low. Currently, there is a technology that places the entire battery module in a coolant, which can improve the heat exchange efficiency to a certain extent.

[0003] Currently, most power battery systems are air-cooled or water-cooled. These systems typically lack a liquid collection chamber, or they typically consist of a single chamber structure, which is unsuitable for the thermal management requirements of battery systems. Air cooling is no longer sufficient to meet these requirements, and the industry is gradually increasing the use of water cooling for thermal management. Summary of the Invention

[0004] The present invention provides the following multiple solutions: a liquid collecting chamber, the liquid collecting chamber comprising at least one first chamber and at least one second chamber, the first chamber covering the battery cell side, the second chamber being arranged next to the first chamber, the first chamber and the second chamber being separated by an insulating wall, the insulating wall having a low heat conduction function or a heat insulation function or a thermal insulation function, and a plurality of flow channel holes being arranged on the insulating wall, the flow channel holes connecting the first chamber and the second chamber for cooling liquid to circulate between the first chamber and the second chamber.

[0005] The first chamber covers the outer surface of the battery cell, and the second chamber is farther away from the outer surface of the battery cell than the first chamber. The coolant in the first chamber undergoes convection heat exchange with the outer surface of the battery cell before flowing into the second chamber. Due to the thermal insulation wall between the first and second chambers, there is essentially no heat conduction or convection between the coolant in the first chamber and the coolant in the second chamber, thereby ensuring that the coolant in the second chamber does not exchange heat with the battery cell surface.

[0006] The liquid collecting chamber can also be used as a liquid separating chamber, which has the function of collecting or separating liquid, collecting the coolant of multiple branches together or dispersing the total coolant into multiple branches.

[0007] As described above, the liquid collecting chamber, preferably, the thermal insulation wall includes a plurality of closed hollow structures, which can reduce the heat transfer between the first chamber and the second chamber; or the thermal insulation wall is made of a low thermal conductivity material; the thermal conductivity of the low thermal conductivity material is preferably less than 0.3 W / (m*K), more preferably less than 0.1 W / (m*K).

[0008] The heat-insulating wall comprises a wall surface and flow channel holes.

[0009] Preferably, the thermal conductivity resistance of the wall surface of the thermal insulation wall is greater than 0.001 m 2 *K / W, more preferably greater than 0.01 m 2 *K / W.

[0010] A liquid collecting chamber includes at least one partition plate disposed within the liquid collecting chamber and dividing the chamber into a first chamber and a second chamber. The partition plate is also provided with a plurality of flow holes that allow coolant to flow between the first and second liquid collecting chambers. The first chamber is disposed outside the battery module. The first chamber is disposed adjacent to the battery module, while the second chamber is located further away from the battery module than the first chamber. Coolant flowing through the battery module flows into the first chamber and then into the second chamber through the flow holes in the partition plate.

[0011] The flow channel holes may be porous or slit-shaped. The partition plate preferably has a heat insulation function and is preferably made of a material with a low thermal conductivity coefficient.

[0012] A battery pack comprises a stacked battery cell group, wherein any one of the above-mentioned liquid collecting cavities is arranged on the side of the battery cell group.

[0013] A battery pack includes a stacked battery cell group, a liquid collecting chamber is provided on the side of the battery cell group, the liquid collecting chamber has a first chamber and a second chamber separated by a partition plate, the first chamber of the liquid collecting chamber covers the side of the battery cell group and forms a seal with the side of the battery cell group, a cooling liquid channel is provided between the battery cells of the battery cell group, the cooling liquid channel is connected to the first chamber, and the cooling liquid flows through the battery cells and then collects in the first chamber and flows through the flow channel holes on the partition plate in the liquid collecting chamber to the second chamber. The overall flow direction of the cooling liquid in the second chamber is parallel to the direction of the partition plate. The cooling liquid in the second chamber does not pass over the surface of the battery cell and therefore does not directly absorb the heat of the battery cell. Therefore, the cooling liquid in the second chamber has little temperature change in the direction parallel to the partition plate.

[0014] The partition plate comprises a wall surface and flow channel holes.

[0015] Preferably, the thermal conductivity resistance of the wall of the partition plate is greater than 0.005 m 2*K / W, more preferably greater than 0.02 m 2 *K / W.

[0016] A battery module, comprising at least one first liquid collecting chamber on each side of the battery module, at least one second liquid collecting chamber in the middle of the battery module, a stacked battery cell group sandwiched between the first and second liquid collecting chambers, the side surfaces of the battery cell group respectively forming a seal with the first and / or second liquid collecting chambers on both sides of the battery cell group, the first liquid collecting chamber comprising at least one first chamber and at least one second chamber, and the second liquid collecting chamber comprising at least two first chambers and at least one second chamber; a partition plate is provided between the first and second chambers, the partition plate having a flow channel hole for allowing coolant to flow between the first and second chambers; The battery module also contains a coolant, which is in direct contact with the outer surface of the battery cell group. There are gaps between the battery cells in the battery cell group. The coolant flows through the gaps between the battery cell groups. The coolant enters the gaps between the battery cells of the battery module from the first liquid collecting chamber and then gathers in the second liquid collecting chamber before flowing out of the battery module.

[0017] By arranging the first chamber and the second chamber on the liquid collecting chamber, the temperature change in the flow direction can be effectively managed, thereby helping to improve the safety and life of the battery system.

[0018] In addition, the present invention also provides a new cable tie and connection structure for a battery module, a new aluminum foil for battery packaging, and a fire extinguishing antifreeze solution for batteries. A battery module comprises a plurality of stacked battery cells. The ends of the module further comprise end plates, the lower parts of the end plates are fixed on a lower box body, and the upper parts of the end plates at both ends are connected by cable ties.

[0019] Aluminum foil for battery packaging can be used to package soft-pack batteries or square batteries. It has the function of resisting corrosion from antifreeze liquid and preferably has a corrosion-resistant composite layer structure. The aluminum foil can be first made into the form of aluminum foil tape and then coated on the battery after removing the release film.

[0020] A fire-extinguishing antifreeze liquid has the functions of a conventional automotive / industrial antifreeze liquid and also has better fire-extinguishing performance, and can be used to extinguish fires in the event of battery fires. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the liquid collecting chamber and its assembly with the battery module according to the present invention.

[0022] Figure 2 Another liquid collecting chamber of the present invention.

[0023] Figure 3 Existing battery system installation. Specific embodiments

[0024] The liquid collecting chamber 1 of the present invention includes at least one partition plate 2 therein. The partition plate 2 is placed in the liquid collecting chamber 1 and divides the liquid collecting chamber into a first chamber 3 and a second chamber 4. The partition plate 2 is also provided with a plurality of flow channel holes 5, which allow the coolant to flow between the first liquid collecting chamber 3 and the second liquid collecting chamber 4. The first chamber 3 is arranged outside the battery module 6. The first chamber 3 is arranged adjacent to the battery module 6, and the second chamber 4 is away from the battery module 6 relative to the first chamber 3. The coolant flowing through the battery module 6 flows into the first chamber 3 and flows into the second chamber 4 through the flow channel holes 5 on the partition plate 2.

[0025] Another liquid collecting chamber 1 of the present invention has two first chambers 3 and one second chamber 4. A partition plate 2 is provided between the first chamber 3 and the second chamber 4. The partition plate 2 has a flow hole 5 and a wall 7. The wall 7 can prevent heat from the liquid in the two first chambers 3 from being transferred to the liquid in the second chamber 4 by conduction, and the wall 7 can also prevent direct convection between the liquid in the first chamber 3 and the second chamber 4. The flow hole allows the liquid in the first chamber to flow into the second chamber.

Claims

1. A liquid collecting chamber, comprising a collecting chamber, an inner cavity of the collecting chamber fixedly connected to a core body, a top of the collecting chamber fixedly connected to a medium pipe, a top of the medium flow channel pipe fixedly connected to a pressure plate, and at least one first collecting chamber and at least one second collecting chamber, the first collecting chamber covering the power supply side, the second collecting chamber arranged next to the first chamber, the first chamber and the second chamber separated, the wall having a good retaining function, a plurality of flow channels arranged on the wall, and the contact area between the coolant at the lower part of the medium flow channel chamber and the core body is increased by a horizontal flow trajectory mechanism. The chamber according to claim 1 , wherein the wall comprises a wall surface and a flow channel hole. The chamber according to claim 1 , wherein the thermal conductivity resistance of the wall surface is greater than 0.001.

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