Battery thermal management device and battery energy storage system

Abstract

The utility model discloses a battery heat management device and a battery energy storage system, the battery heat management device comprises a runner plate, a fluid channel is arranged in the runner plate, and heat exchange gas circulates in the fluid channel; a guide bar assembly is arranged at the top end of the runner plate, a liquid accumulation groove is formed in the side face of the guide bar assembly, the side face of the guide bar assembly comprises a side face upper portion and a side face lower portion, and the side face upper portion is not communicated with the bottom end of the liquid accumulation groove; the guide bar assembly is connected with a first wiring structure, the upper portion of the side face is communicated with the first wiring structure, the runner plate is connected with a second wiring structure, and the bottom end of the liquid accumulation groove is communicated with the second wiring structure. The battery energy storage system adopts the heat management device, heat exchange is carried out through gas, the risk of leakage of cooling liquid is avoided, in addition, through the arrangement of the liquid accumulation groove, when condensation accumulates, the upper portion of the side face is communicated with the bottom end of the liquid accumulation groove, and therefore whether condensation exists or not can be judged only by connecting an external circuit. The utility model belongs to the technical field of battery thermal management.

Description

Technical Field

[0001] The utility model relates to the technical field of battery thermal management, and particularly relates to a battery thermal management device and a battery energy storage system. Background Art

[0002] For the thermal management of battery cells in an energy storage system, air cooling or liquid cooling is generally adopted. Among them, air cooling is to install a fan in the battery cell or battery module for thermal management, and the liquid cooling method is to install a flow channel plate at the bottom, side or top of the battery cell or battery module for thermal management. Although the liquid cooling method can quickly dissipate heat from the battery cell, it faces the risk of coolant leakage. In addition, some energy storage systems work in a high-humidity environment, and the temperature of the flow channel plate is relatively low, which is prone to condensation, thus forming an electrical safety hazard. Summary of the Utility Model

[0003] Aiming at the technical problems existing in the prior art, the purpose of the utility model is to provide a battery thermal management device and a battery energy storage system, which can effectively manage the heat of the battery pack and improve electrical safety.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme: a battery thermal management device includes a flow channel plate, a fluid channel is arranged inside the flow channel plate, and a heat exchange gas flows through the fluid channel; a guide bar assembly is arranged at the top end of the flow channel plate, a liquid accumulation groove is formed on the side surface of the guide bar assembly, the side surface of the guide bar assembly includes an upper side surface and a lower side surface, and there is no conduction between the upper side surface and the bottom end of the liquid accumulation groove; the guide bar assembly is connected with a first wiring structure, the upper side surface is conducted with the first wiring structure, the flow channel plate is connected with a second wiring structure, and the bottom end of the liquid accumulation groove is conducted with the second wiring structure.

[0005] After adopting this structure, heat exchange is carried out between the gas and the battery pack. Compared with the liquid cooling plate, the risk of coolant leakage is avoided. In addition, since the temperature of the flow channel plate is relatively low, a liquid accumulation groove is arranged at its top end. When there is no condensation in the normal state, the first wiring structure and the second wiring structure are not conducted. When condensation accumulates in the liquid accumulation groove and makes the upper side surface conduct with the bottom end of the liquid accumulation groove, only an external circuit needs to be connected to judge whether there is condensation, realizing the early warning of the accumulation of condensation and further improving electrical safety.

[0006] As a preference, the battery thermal management device further includes an alarm circuit, the first wiring structure and the second wiring structure are connected to the alarm circuit, and the alarm circuit alarms when the first wiring structure and the second wiring structure are conducted.

[0007] As a preference, the battery thermal management device further includes a vortex tube device. The flow channel plate is provided with an inlet end connector and an outlet end connector. Two ends of the fluid channel are respectively connected to the inlet end connector and the outlet end connector, and the vortex tube device is connected to the inlet end connector and the outlet end connector.

[0008] As a preference, the fluid channel adopts a Tesla valve structure.

[0009] As a preference, the bar assembly includes a bar made of a conductive material and an insulating plate made of an insulating material. The insulating plate and the conductor are fixedly stacked on the top end of the flow channel plate in sequence. The insulating plate separates between the bar and the top surface of the flow channel plate. The upper side surface and the lower side surface are respectively the side surfaces of the bar and the insulating plate.

[0010] As a preference, the flow channel plate includes an upper cover plate and a lower bottom plate. The fluid channel is located between the upper cover plate and the lower bottom plate. The upper cover plate and the bar assembly are both arranged on the top end of the lower bottom plate. The bar assembly is located on the side of the upper cover plate. The liquid accumulation groove is formed between the side surface of the upper cover plate and the side surface of the bar assembly. Both the upper cover plate and the lower bottom plate are made of a conductive material.

[0011] As a preference, the cross section of the upper cover plate is trapezoidal. From the bottom end to the top opening of the liquid accumulation groove, the cross-sectional width of the liquid accumulation groove gradually increases.

[0012] As a preference, the number of bar assemblies is two, and the two bar assemblies are respectively arranged on the left and right sides of the upper cover plate.

[0013] As a preference, the lower bottom plate is further connected with a pole piece. The pole piece is provided with a pole hole for passing through the battery pole; both the first wiring structure and the second wiring structure are wiring posts.

[0014] As a preference, a battery energy storage system adopts the above-mentioned battery thermal management device, and includes a battery pack, a BMS system, and a temperature sensor. The flow channel plate is arranged on the top end of the battery pack. The temperature sensor is used to detect the temperature of the flow channel plate, and the BMS system is electrically connected to the temperature sensor.

[0015] Generally speaking, the present utility model has the following advantages:

[0016] (1) The structure of this device is simple. Instead of using a cooling liquid, a gas is used as the heat exchange medium to prevent the occurrence of liquid leakage. And through the cooperation of the liquid accumulation groove and the alarm circuit, an alarm is given when condensation accumulates, reminding the staff to take measures, which can ensure the safe operation of the battery unit in a high-humidity environment and further enhance the electrical safety.

[0017] (2) This device arranges the flow channel plate on the top end of the battery pack and welds it to the battery pole, which can not only effectively dissipate heat from the bus bar and the pole, but also save the installation space.

[0018] (3) The device has a wide range of usage scenarios. Due to the dew condensation alarm function and the use of a vortex tube device that can provide cold air and hot air, it can be used in high-humidity environments, extremely cold environments, and high-temperature environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 An exploded view of a battery thermal management device.

[0020] Figure 2 A perspective view of a battery thermal management device.

[0021] Figure 3 A front view of a battery thermal management device.

[0022] Figure 4 A top view of a battery thermal management device.

[0023] Among them, 1 is a conducting bar, 2 is an upper cover plate, 3 is an insulating plate, 4 is an inlet end connector, 5 is a lower bottom plate, and 6 is a liquid accumulation tank.

[0024] 11 is the first wiring structure.

[0025] 51 is a pole piece, 52 is a fluid channel, and 53 is the second wiring structure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following will further elaborate on the present utility model in detail in conjunction with the drawings and specific embodiments.

[0027] As Figures 1 to 4 shown, a battery thermal management device includes a flow channel plate. A fluid channel is provided inside the flow channel plate, and a heat exchange gas flows through the fluid channel. A conducting bar assembly is provided at the top of the flow channel plate. A liquid accumulation tank is formed on the side of the conducting bar assembly. The side of the conducting bar assembly includes an upper side and a lower side, and there is no conduction between the upper side and the bottom end of the liquid accumulation tank. The conducting bar assembly is connected to a first wiring structure, and the upper side is in conduction with the first wiring structure. The flow channel plate is connected to a second wiring structure, and the bottom end of the liquid accumulation tank is in conduction with the second wiring structure.

[0028] The flow channel plate can be connected to an external device that provides the heat exchange gas. The heat exchange gas is transported into the fluid channel by this external device, exchanges heat with the battery, and then flows out. The first wiring structure and the second wiring structure can be connected to an external alarm circuit to achieve alarm when dew condensation accumulates.

[0029] In some embodiments, the battery thermal management device further includes an alarm circuit. The first wiring structure and the second wiring structure are connected to the alarm circuit, and the alarm circuit alarms when the first wiring structure and the second wiring structure are conducting. The alarm circuit can adopt an existing alarm circuit, which includes a power supply, a buzzer, etc. There are two disconnected contacts on the alarm circuit, one of which is connected to the first wiring structure and the other is connected to the second wiring structure. Under normal non-condensation conditions, since the upper part of the side and the bottom end of the liquid accumulation tank are not conducting, the first wiring structure and the second wiring structure are not conducting; when a certain amount of condensation accumulates in the liquid accumulation tank, the first wiring structure and the second wiring structure are conducting, which can make the entire alarm circuit conducting and the buzzer alarms. In this way, the on-off of the alarm circuit can be controlled by whether there is condensation accumulation in the liquid accumulation tank to achieve condensation alarm.

[0030] In some embodiments, the battery thermal management device further includes a vortex tube device. The flow channel plate is provided with an inlet end connector and an outlet end connector. The two ends of the fluid channel are respectively connected to the inlet end connector and the outlet end connector, and the vortex tube device is connected to the inlet end connector and the outlet end connector. The vortex tube device transports the heat exchange gas from the inlet end connector to the fluid channel, and the gas after heat exchange then flows back to the vortex tube device from the outlet end connector to realize the circulating flow of the heat exchange gas.

[0031] The vortex tube device can adopt existing equipment, which uses compressed gas, can provide stable cold air and hot air, and can realize automatic temperature adjustment by adjusting its internal control valve. When the battery energy storage system needs to be cooled, the vortex tube device provides cold air for the flow channel plate; when the battery energy storage system needs to be heated, the vortex tube device provides hot air for the flow channel plate.

[0032] In some embodiments, the fluid channel adopts a Tesla valve structure. Adopting a fluid channel in the form of a Tesla valve can, on the one hand, increase the contact area between the heat exchange gas and the flow channel plate and enhance the thermal management effect, and on the other hand, can realize the unidirectional and controllable flow of the gas.

[0033] In some embodiments, the conducting bar assembly includes a conducting bar made of a conductive material and an insulating plate made of an insulating material. The insulating plate and the conductor are fixedly stacked on the top of the flow channel plate in sequence. The insulating plate separates between the conducting bar and the top surface of the flow channel plate. The upper part of the side and the lower part of the side are the side surfaces of the conducting bar and the insulating plate respectively.

[0034] The conducting bar assembly is fixedly connected to the flow channel plate. The upper part of the side, that is, the side surface of the conducting bar, is conducting through the conducting bar itself with the first wiring structure. Under normal conditions, due to the separation of the insulating plate, the conducting bar and the bottom end of the liquid accumulation tank are not conducting. When there is condensation in the tank and the condensation accumulates to the height of the conducting bar, the conductor and the bottom end of the liquid accumulation tank are conducting through the condensation.

[0035] In some embodiments, the flow channel plate includes an upper cover plate and a lower bottom plate. The fluid channel is located between the upper cover plate and the lower bottom plate. The upper cover plate and the guide bar assembly are both disposed at the top end of the lower bottom plate. The guide bar assembly is located on the side of the upper cover plate. The liquid accumulation groove is formed between the side surface of the upper cover plate and the side surface of the guide bar assembly. Both the upper cover plate and the lower bottom plate are made of conductive materials. The second wiring structure is fixedly disposed at the front side of the lower bottom plate, at the bottom end of the liquid accumulation groove. That is, the top end of the lower bottom plate is electrically connected to the second wiring structure through the lower bottom plate itself.

[0036] Both the upper cover plate and the lower bottom plate are provided with channel grooves. The two channel grooves are in a mirror image relationship and cooperate to form a fluid channel.

[0037] In some embodiments, the cross-section of the upper cover plate is trapezoidal. From the bottom end to the top opening of the liquid accumulation groove, the cross-sectional width of the liquid accumulation groove gradually increases.

[0038] In some embodiments, the number of guide bar assemblies is two. The two guide bar assemblies are respectively disposed on the left and right sides of the upper cover plate. Two liquid accumulation grooves are formed at the top end of the flow channel plate. The liquid accumulation grooves are strip-shaped. When there is a certain amount of condensation in any one of the liquid accumulation grooves, the alarm circuit will be triggered to alarm.

[0039] In some embodiments, the lower bottom plate is further connected with a pole piece. The pole piece is provided with a pole hole for passing through the battery pole. Both the first wiring structure and the second wiring structure are terminal posts.

[0040] This embodiment also provides a battery energy storage system, which adopts the above-mentioned battery thermal management device, and includes a battery pack, a BMS system, and a temperature sensor. The flow channel plate is disposed at the top end of the battery pack. The temperature sensor is used to detect the temperature of the flow channel plate. The BMS system is electrically connected to the temperature sensor. When the battery is operating, the temperature sensor welded on the flow channel plate performs temperature sampling. The BMS system is electrically connected to the vortex tube device. After receiving the temperature information, the BMS system controls the externally connected vortex tube device, and through the output flow control of the vortex tube device, the battery temperature is maintained within a reasonable operating range.

[0041] The size and material of the flow channel plate can be adjusted to adapt to different battery energy storage systems. For example, the upper cover plate and the lower bottom plate where the fluid channel is located can use other materials, which can further reduce the use cost.

[0042] The number of flow channel plates can be multiple. Multiple flow channel plates are arranged in parallel or in series at the top end of the battery pack. The battery pole passes through the pole hole on the pole piece, and the two are welded together.

[0043] 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, or simplifications made without departing from the spirit and principle of the utility model shall be equivalent replacement methods and are all included in the protection scope of the utility model.

Claims

1. A battery thermal management device, characterized in that: It includes a flow channel plate, the interior of which is provided with a fluid channel, and heat exchange gas flows in the fluid channel; a guide bar assembly is provided at the top of the flow channel plate, and a liquid accumulation groove is formed on the side of the guide bar assembly, and the side of the guide bar assembly includes an upper side portion and a lower side portion, and there is no conduction between the upper side portion and the bottom end of the liquid accumulation groove; the guide bar assembly is connected to a first wiring structure, and the upper side portion is connected to the first wiring structure, and the flow channel plate is connected to a second wiring structure, and the bottom end of the liquid accumulation groove is connected to the second wiring structure.

2. A battery thermal management device according to claim 1, characterized in that: It also includes an alarm circuit. The first wiring structure and the second wiring structure are connected to the alarm circuit. When the first wiring structure and the second wiring structure are connected, the alarm circuit alarms.

3. A battery thermal management device according to claim 1, characterized in that: It also includes a vortex tube device, the flow channel plate is provided with an inlet end connector and an outlet end connector, the two ends of the fluid channel are respectively connected to the inlet end connector and the outlet end connector, and the vortex tube device connects the inlet end connector and the outlet end connector.

4. A battery thermal management device according to claim 1, characterized in that: The fluid channel adopts Tesla valve structure.

5. A battery thermal management device according to claim 1, characterized in that: The guide bar assembly includes a guide bar made of a conductive material and an insulating plate made of an insulating material. The insulating plate and the conductor are fixedly stacked on the top of the flow channel plate in sequence. The insulating plate separates the guide bar from the top surface of the flow channel plate. The upper side and the lower side are the side surfaces of the guide bar and the insulating plate respectively.

6. A battery thermal management device according to claim 1, characterized in that: The flow channel plate comprises an upper cover plate and a lower bottom plate, and the fluid channel is located between the upper cover plate and the lower bottom plate; The upper cover plate and the guide bar assembly are both arranged at the top end of the lower base plate, the guide bar assembly is located on the side of the upper cover plate, the liquid accumulation groove is formed between the side of the upper cover plate and the side of the guide bar assembly, and the upper cover plate and the lower base plate are both made of conductive material.

7. A battery thermal management device according to claim 6, characterized in that: The cross section of the upper cover plate is trapezoidal, and the cross section width of the liquid collection groove gradually increases from the bottom end to the top opening of the liquid collection groove.

8. A battery thermal management device according to claim 6, characterized in that: The number of the guide bar assemblies is two, and the two guide bar assemblies are respectively arranged on the left and right sides of the upper cover plate.

9. A battery thermal management device according to claim 6, characterized in that: The lower base plate is also connected to a pole sheet, and the pole sheet is provided with a pole hole for passing the battery pole; the first wiring structure and the second wiring structure are both wiring posts.

10. A battery energy storage system, using a battery thermal management device according to any one of claims 1 to 9, characterized in that: It includes a battery pack, a BMS system, and a temperature sensor. The flow channel plate is arranged at the top of the battery pack. The temperature sensor is used to detect the temperature of the flow channel plate. The BMS system is electrically connected to the temperature sensor.

Images