Battery pack heat management structure and battery pack

Abstract

The utility model relates to a heat management structure of a battery pack, the heat management structure of the battery pack comprises a box body, a heat dissipation assembly and a heating sheet, the heat dissipation assembly comprises a liquid cooling plate and a heat pipe; a battery cell mounting position for placing a battery cell is arranged in the box body, the liquid cooling plate, the heat pipe and the heating sheet are all mounted in the box body, the liquid cooling plate is vertically arranged on the side surface of the battery cell mounting position, and the heat pipe and the heating sheet are both positioned below the battery cell mounting position. The utility model further relates to a battery pack which comprises the battery cells and the battery pack heat management structure. The utility model has the remarkable advantages of compact structure and high battery pack heat management efficiency, and belongs to the field of energy storage batteries.

Description

Technical Field

[0001] The utility model relates to the field of energy storage batteries, and particularly relates to a battery pack thermal management structure and a battery pack. Background Technique

[0002] Energy storage batteries have the function of regulating energy storage and release, can efficiently achieve energy conversion, improve the stability of the power system, and have good market prospects.

[0003] At present, large-scale containerized lithium battery energy storage has the characteristics of long life, high energy density, high efficiency, strong environmental adaptability, etc., and the containerized lithium battery industry develops rapidly. However, due to the great correlation between the working performance and safety of lithium batteries and their working temperature, too high or too low temperature and uneven temperature distribution will pose great challenges to the safety and performance of the batteries: when the temperature is too low, the battery may be subject to low-temperature shock, the battery capacity drops rapidly, and the battery charge and discharge power is limited; when the temperature is too high, the battery discharge rate accelerates, which easily leads to battery capacity loss, and also accelerates battery aging. In severe cases, thermal runaway or thermal spread accidents may occur, triggering safety accidents. Therefore, an efficient battery pack thermal management structure is the key to the safe and reliable operation of the lithium battery energy storage system. Summary of the Utility Model

[0004] Aiming at the technical problems existing in the prior art, the purpose of the utility model is to provide a battery pack thermal management structure and a battery pack that can efficiently manage the heat of energy storage batteries.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A battery pack thermal management structure includes a box body, a heat dissipation component and a heating sheet. The heat dissipation component includes a liquid cooling plate and a heat pipe; a battery cell installation position for placing battery cells is provided in the box body. The liquid cooling plate, the heat pipe and the heating sheet are all installed in the box body. The liquid cooling plate is vertically arranged on the side of the battery cell installation position, and the heat pipe and the heating sheet are both located below the battery cell installation position. After adopting this structure, in the case of a relatively high temperature of the battery cells, the heat pipe and the liquid cooling plate can dissipate heat from the bottom and side of the battery cells; in the case of a relatively low temperature of the battery cells, the heating sheet can heat the bottom of the battery cells; the cooperation of the heat pipe, the liquid cooling plate and the heating sheet can provide a stable temperature working environment for the battery cells to improve the working performance of the battery cells and extend the service life of the battery cells.

[0007] As a preference, the box body includes a box body bottom plate, and a first groove and a second groove are provided on the box body bottom plate. The bottom end of the liquid cooling plate is embedded in the first groove, and the heat pipe is embedded in the second groove. After adopting this structure, the liquid cooling plate and the heat pipe can be fixedly installed on the box body bottom plate.

[0008] As a preference, the heat pipe includes a condensation section and an evaporation section. The evaporation section is located below the battery cell mounting position, and the condensation section is in contact with the bottom end of the liquid cooling plate. After adopting this structure, the evaporation section can absorb the heat at the bottom of the battery cell and transfer it to the condensation section for heat dissipation; the contact between the condensation section and the bottom end of the liquid cooling plate can improve the heat dissipation efficiency of the heat pipe.

[0009] As a preference, a notch is formed at the bottom end of the liquid cooling plate. The position of the notch corresponds to the position of the heat pipe. The condensation section is in contact with the liquid cooling plate at the notch, and the condensation section of the heat pipe passes through the space between the notch and the bottom plate of the box body. After adopting this structure, the heat dissipation effect at the bottom of the battery cell is good. After the heat pipe absorbs the heat at the bottom of the battery cell, it can transfer the heat to the liquid cooling plate for heat dissipation.

[0010] As a preference, the side wall of the notch is open, so that the heat pipe is in contact with the coolant in the liquid cooling plate; the heat pipe is hermetically connected to the edge of the notch. After adopting this structure, the heat transfer coefficient at the contact interface between the heat pipe and the liquid cooling plate is higher, and the thermal resistance of heat transfer is lower, which can further improve the heat dissipation efficiency between the heat pipe and the liquid cooling plate, and the heat dissipation effect of the battery pack thermal management structure is better.

[0011] As a preference, the condensation sections are located at both ends of the heat pipe, and the number of heat dissipation components is several; in each heat dissipation component, the number of liquid cooling plates is two and they are parallel to each other, and the number of heat pipes is multiple and they are parallel to each other. The condensation sections at both ends of each heat pipe are respectively in contact with the two parallel liquid cooling plates. After adopting this structure, the heat absorbed by the evaporation section of the heat pipe from the bottom of the battery cell can be transferred to the condensation sections at both ends of the heat pipe, and each heat pipe can transfer heat to the two liquid cooling plates, and the heat dissipation effect is good.

[0012] As a preference, the number of heating sheets is multiple, and the heating sheets are located between adjacent heat pipes in each heat dissipation component. After adopting this structure, the heating sheets can realize the heating function while not affecting the heat dissipation function of the battery pack thermal management structure, and the layout of the heating sheets and the heat dissipation components is reasonable; multiple heating sheets heat the battery cells, which can realize the rapid heating of the battery cells and then improve the working performance of the battery cells.

[0013] As a preference, a third groove is also formed on the bottom plate of the box body, and the heating sheet is embedded in the third groove. After adopting this structure, the heating sheet can be fixed on the bottom plate of the box body.

[0014] As a preference, a horizontally U-shaped flow channel is provided inside the liquid cooling plate. An inlet and an outlet are provided on the side surface of the liquid cooling plate. Both the inlet and the outlet are communicated with the flow channel, and the inlet is located below the outlet. After adopting this structure, the coolant in the liquid cooling plate can flow in the direction from bottom to top and fill the liquid cooling plate; when realizing the heat dissipation function of the battery pack thermal management structure, the temperature of the coolant in the liquid cooling plate will gradually increase along the flow direction, and the temperature of the inlet is lower than that of the outlet, which is beneficial to the heat dissipation at the bottom of the battery cell, and the cooling effect of the battery cell is better.

[0015] A battery pack includes battery cells and the battery pack thermal management structure in any of the above technical solutions; the battery cells are fixedly installed at the battery installation positions in the box body, the liquid cooling plate is attached to the side wall of the battery cells, and both the heat pipe and the heating sheet are attached to the bottom of the battery cells; a thermal conductive structural adhesive is respectively coated between the battery cells and the liquid cooling plate, between the battery cells and the heat pipe, and between the battery cells and the heating sheet. After adopting this structure, the battery cells and the battery pack thermal management structure transfer heat through the thermal conductive structural adhesive, and the heat pipe, the liquid cooling plate and the heating sheet cooperate with each other to perform thermal management on the battery pack. It not only has the advantage of higher thermal management efficiency of the battery cells, but also has the advantages of compact structure and large space utilization rate of the battery pack because the heat dissipation elements and the heating elements occupy less space. More battery packs can be arranged in a limited space, which is beneficial to the development of the large container type lithium battery industry.

[0016] Generally speaking, the battery pack thermal management structure and the battery pack involved in the present utility model have the following advantages: high thermal management efficiency, compact structure, and high space utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the battery pack thermal management structure.

[0018] Figure 2 It is a schematic diagram of the structure of the battery pack.

[0019] Figure 3 It is a schematic diagram of the structure of the liquid cooling plate.

[0020] Figure 4 It is a schematic diagram of the structure of the internal flow channel of the liquid cooling plate.

[0021] 1 is the bottom plate of the box body, 2 is the liquid cooling plate, 3 is the heat pipe, 4 is the heating sheet, 5 is the first groove, 6 is the second groove, 7 is the third groove, 8 is the notch, 9 is the water outlet, 10 is the water inlet, and 11 is the battery cell. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments.

[0023] A battery pack thermal management structure includes a box body, a heat dissipation component and a heating sheet 4, and the heat dissipation component includes a liquid cooling plate 2 and a heat pipe 3; a battery cell installation position for placing battery cells is provided in the box body, and the liquid cooling plate, the heat pipe and the heating sheet are all installed in the box body. The liquid cooling plate is vertically arranged on the side of the battery cell installation position, and both the heat pipe and the heating sheet are located below the battery cell installation position. In this embodiment, the heating sheet is a ceramic heating sheet.

[0024] The box body includes a box body bottom plate 1, on which a first groove 5 and a second groove 6 are provided. The bottom end of the liquid cooling plate is embedded in the first groove, and the heat pipe is embedded in the second groove. The box body also includes box body side plates and a box body cover plate, and the box body bottom plate, box body side plates and box body cover plate are connected to form a box body in the shape of a cuboid.

[0025] The heat pipe includes a condensation section and an evaporation section. The evaporation section is located below the battery cell installation position, and the condensation section is in contact with the bottom end of the liquid cooling plate.

[0026] A notch 8 is formed at the bottom end of the liquid cooling plate, and the position of the notch corresponds to the position of the heat pipe. The condensation section is in contact with the liquid cooling plate at the notch, and the condensation section of the heat pipe passes through the space between the notch and the box body bottom plate.

[0027] The side wall of the notch is open, so that the heat pipe is in contact with the coolant in the liquid cooling plate; the heat pipe is hermetically connected to the edge of the notch. The depth of the notch is less than the depth of the first groove. The thickness of the heat pipe is equal to the depth of the notch, so that the heat pipe can just block and seal the notch, and a structural adhesive for sealing is applied between the heat pipe and the liquid cooling plate.

[0028] The condensation sections are located at both ends of the heat pipe, and the number of heat dissipation components is several; in each heat dissipation component, the number of liquid cooling plates is two and they are parallel to each other, the number of heat pipes is multiple and they are parallel to each other, and the condensation sections at both ends of each heat pipe are respectively in contact with the two parallel liquid cooling plates. The heat pipe is a long and straight flat-round or rectangular heat pipe, the liquid cooling plate is in the shape of a flat plate, the length direction of the heat pipe is perpendicular to the liquid cooling plate, and the condensation sections at both ends of the heat pipe respectively pass through the notches of the two parallel liquid cooling plates; the number of battery installation positions is the same as the number of heat dissipation components.

[0029] The number of heating sheets is multiple, and the heating sheets are located between adjacent heat pipes in each heat dissipation component.

[0030] A third groove 7 is also formed on the box body bottom plate, and the heating sheet is embedded in the third groove.

[0031] The inside of the liquid cooling plate is provided with a horizontal U-shaped flow channel, and the side of the liquid cooling plate is provided with a water inlet 10 and a water outlet 9. Both the water inlet and the water outlet are communicated with the flow channel, and the water inlet is located below the water outlet. When the battery pack thermal management structure realizes the heat dissipation function, the heat at the bottom of the battery cell is transferred from the evaporation section in the middle of the heat pipe to the condensation sections at both ends of the heat pipe, and then transferred from the condensation sections to the liquid cooling plate. The design of the flow channel of the liquid cooling plate can make the condensation section of the heat pipe contact the coolant with a lower temperature near the water inlet side, which can improve the heat dissipation efficiency.

[0032] A battery pack includes a battery cell 11 and the battery pack thermal management structure in any of the above technical solutions; the battery cell is fixedly installed on the battery installation position in the box body, the liquid cooling plate is attached to the side wall of the battery cell, and the heat pipe and the heating sheet are both attached to the bottom of the battery cell; a thermal conductive structural adhesive is respectively applied between the battery cell and the liquid cooling plate, between the battery cell and the heat pipe, and between the battery cell and the heating sheet.

[0033] In this embodiment, the number of heat dissipation components is two, and the number of battery installation positions is two; the battery cells selected are square lithium-ion battery cells; on each battery installation position, the distribution of the battery cells on the horizontal plane corresponds to the distribution of the heat pipes, and one battery cell is correspondingly arranged directly above each heat pipe, and a heating sheet is arranged in the middle of adjacent heat pipes. Since the heat conduction characteristics of the battery cells are such that the thermal conductivity coefficients on the side surfaces and the upper and lower square surfaces are much greater than those in the large surface direction, therefore, the heat pipes, heating sheets and liquid cooling plates arranged in contact with the bottom surface and the two side surfaces of the battery cells can better achieve the thermal management of the battery cells, and the heat dissipation effect of the battery pack is good.

[0034] The above embodiments are the preferred embodiments of the utility model, but the embodiments of the utility model are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the utility model shall be equivalent replacement methods and shall be included in the protection scope of the utility model.

Claims

1. A battery pack thermal management structure, characterized in that: It includes a box body, a heat dissipation component and a heating plate, and the heat dissipation component includes a liquid cooling plate and a heat pipe; A cell installation position for placing the cell is provided in the box, and a liquid cooling plate, a heat pipe and a heating plate are all installed in the box, the liquid cooling plate is vertically arranged on the side of the cell installation position, and the heat pipe and the heating plate are both located below the cell installation position; The box body comprises a box body bottom plate, a first groove and a second groove are arranged on the box body bottom plate, the bottom end of the liquid cooling plate is embedded in the first groove, and the heat pipe is embedded in the second groove; The heat pipe includes a condensing section and an evaporating section. The evaporating section is located below the battery cell installation position, and the condensing section is in contact with the bottom end of the liquid cooling plate. A notch is formed at the bottom of the liquid cooling plate, the position of the notch corresponds to the position of the heat pipe, the condensing section contacts the liquid cooling plate at the notch, and the condensing section of the heat pipe passes through the space between the notch and the bottom plate of the box; The side wall of the notch is open so that the heat pipe contacts the cooling liquid in the liquid cooling plate; the heat pipe is sealed and connected to the edge of the notch; The condensing sections are located at both ends of the heat pipe, and the number of heat dissipation components is several; In each heat dissipation component, there are two liquid cooling plates which are parallel to each other, there are multiple heat pipes which are parallel to each other, and the condensation sections at both ends of each heat pipe are in contact with the two parallel liquid cooling plates respectively; There are multiple heating plates, and the heating plates are located between adjacent heat pipes in each heat dissipation component; A third groove is also formed on the bottom plate of the box body, and the heating plate is embedded in the third groove; A horizontal U-shaped flow channel is provided inside the liquid cooling plate, and a water inlet and a water outlet are provided on the side of the liquid cooling plate. The water inlet and the water outlet are both connected to the flow channel, and the water inlet is located below the water outlet.

2. A battery pack, characterized in that: Comprising a battery cell and the thermal management structure of the battery pack according to claim 1; The battery cell is fixedly installed on the battery installation position in the box, the liquid cooling plate is attached to the side wall of the battery cell, and the heat pipe and the heating plate are attached to the bottom of the battery cell; Thermally conductive structural adhesive is applied between the battery cell and the liquid cooling plate, between the battery cell and the heat pipe, and between the battery cell and the heating plate.

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