A device for balancing the internal temperature of a battery module and applications thereof

Abstract

The application discloses a device for balancing the internal temperature of a battery module and application thereof. The device comprises a liquid outlet pipeline arranged at the top of the battery module and a drainage pipeline arranged on the outer sidewall of each single battery cell. The liquid outlet pipeline is provided with a plurality of groups of liquid outlets, and the liquid outlets comprise normal liquid inlets and standby liquid inlets. The drainage pipeline comprises an upper section drainage pipeline and a lower section drainage pipeline, and the upper section drainage pipeline is surrounded by a plurality of vertically arranged spliced blades. The drainage pipeline can ensure that each single battery cell in the module continuously exchanges heat with the cooling liquid. When the temperature of a certain position of the battery cell is too high, the top of the drainage pipeline is opened to store more cooling liquid. Under the action of gravity, the cooling liquid accelerates the flow of the cooling liquid in the pipeline, reduces the temperature difference of the single battery cells in the module, and improves the overall service life, safety performance and charge-discharge capacity of the battery module.

Description

[0001] Technical field

[0002] This invention specifically relates to a device for balancing the internal temperature of a battery module and its application, belonging to the technical field of battery heat dissipation technology. Background Technology

[0003] Capacity, energy density, and discharge rate are all key technical indicators of batteries. Although different batteries may have similar specifications, inconsistent performance and even fires and explosions can still occur; this is mainly due to the significant impact of temperature on batteries. During use, batteries undergo a series of internal chemical reactions, generating heat. If this heat cannot be dissipated in time, it will affect the battery's charge / discharge capacity, lifespan, and safety performance. To help batteries operate in suitable temperature environments, power battery systems employ various technical solutions, including air cooling, liquid cooling, phase change cooling, and refrigerant cooling. These solutions can effectively reduce the overall temperature of the battery module, but they lack specificity for individual cell temperature control. If a single cell within a battery module operates at a high temperature for an extended period, its lifespan and charge / discharge capacity will be lower than other cells, creating a "weakest link" effect that impacts the entire battery module's lifespan and may even lead to fires or explosions. Therefore, the consistency of individual cells within a battery pack plays a crucial role. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a device for balancing the internal temperature of a battery module;

[0005] The present invention also provides a method for balancing the internal temperature of a battery module using the above-described device.

[0006] The technical solution of this invention is as follows:

[0007] A device for balancing the internal temperature of a battery module includes an outlet pipe disposed at the top of the battery module and a drainage pipe disposed on the outer wall of each individual cell; the outlet pipe has multiple sets of outlets, including a common inlet and a spare inlet; the drainage pipe includes an upper drainage pipe and a lower drainage pipe, the upper drainage pipe being formed by multiple vertically arranged spliced ​​blades, the bottom of each spliced ​​blade being hinged to the lower drainage pipe, so that the top opening of the upper drainage pipe forms an openable and closable structure; the inner wall of the drainage pipe is provided with a waterproof membrane, the waterproof membrane penetrating the entire inner wall of the drainage pipe from top to bottom, wherein the perimeter of the waterproof membrane in the upper drainage pipe section corresponds to the perimeter of the upper drainage pipe when the top opening is open; the outlet is located above the upper drainage pipe.

[0008] Preferably, the drainage pipe is equipped with a relay for controlling the opening and closing of the splicing blades.

[0009] Preferably, the angle between the spliced ​​blades in the open state and the vertical direction is 54°.

[0010] Preferably, the lower section of the drainage pipe corresponds to the height of the individual battery cell; the upper section of the drainage pipe extends above the individual battery cell.

[0011] Preferably, the drainage pipe is provided with a limiting baffle to restrict the opening angle of the splicing blades.

[0012] Preferably, the ends of all the drainage pipes are connected to the outlet pipe to achieve the collection and discharge of coolant.

[0013] A method for balancing the internal temperature of a battery module using the above-mentioned device includes the following steps:

[0014] When a single battery cell is working normally, the liquid inlet is normally open, the upper drainage pipe is closed, and the waterproof membrane between adjacent splicing blades folds outward. The coolant flows through the drainage pipe and exchanges heat with the single battery cell.

[0015] When a single cell overheats, the splicing blades open to 54°, the upper drainage pipe opens, and the backup liquid inlet opens simultaneously. The amount of liquid flowing into the upper drainage pipe per unit time increases, and under the action of gravity, the liquid flow rate in the drainage pipe increases, rapidly reducing the temperature at that location and balancing the internal temperature of the battery module.

[0016] The beneficial effects of this invention are as follows:

[0017] The drainage pipe of this invention ensures continuous heat exchange between each individual cell and the coolant within the module, keeping the cells at a suitable operating temperature. Simultaneously, when the temperature at a certain point in the cell becomes too high, the top of the drainage pipe opens to store more coolant. Under the influence of gravity, the coolant flow within the pipe accelerates, improving the heat exchange efficiency between the heat-generating location and the coolant, reducing the temperature at the overheated location, and thus ensuring a more balanced temperature for each individual cell within the module. This reduces the temperature difference between individual cells within the module, improving the overall lifespan, safety performance, and charge / discharge capability of the battery module. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the drainage pipeline described in this invention;

[0019] Figure 2 A schematic diagram of the overall structure of a battery module including a drainage pipeline device;

[0020] Figure 3 This is a top view of the upper section of the drainage pipe;

[0021] Figure 4 This is a front view of the upper section of the drainage pipe;

[0022] Among them, 1. Upper drainage pipe; 2. Hinge; 3. Lower drainage pipe; 4. Limiting baffle; 5. Waterproof membrane; 6. Common liquid inlet; 7. Spare liquid inlet; 8. Upper drainage pipe in open state; 9. Individual battery cell; 10. Liquid outlet pipe; 11. Screw. Detailed Implementation

[0023] The following describes some embodiments of the present invention in detail with reference to the accompanying drawings.

[0024] Example 1

[0025] A device for balancing the internal temperature of a battery module includes an outlet pipe disposed at the top of the battery module and a drainage pipe disposed on the outer wall of each individual battery cell 9. The outlet pipe has multiple outlets, including a common inlet 6 and a spare inlet 7. The drainage pipe includes an upper drainage pipe 1 and a lower drainage pipe 3. The upper drainage pipe 1 is formed by multiple vertically arranged spliced ​​blades, the bottom of each spliced ​​blade being hinged to the lower drainage pipe 3, so that the top opening of the upper drainage pipe 1 forms an openable structure. A waterproof membrane 5 is disposed on the inner wall of the drainage pipe, the waterproof membrane 5 penetrating the entire inner wall of the drainage pipe from top to bottom, wherein the perimeter of the waterproof membrane 5 in the upper drainage pipe 1 corresponds to the perimeter of the upper drainage pipe 1 when the top opening is open. The outlet is located above the upper drainage pipe 1. In this embodiment, the waterproof membrane 5 is a high cross-linking density membrane. The bottom of the splicing blade is hinged to the lower drainage pipe 3 via a hinge. The waterproof membrane 5 is fixed to the splicing blade by screws 11.

[0026] Example 2

[0027] As described in Example 1, the device for balancing the internal temperature of the battery module further includes a relay on the drain pipe for controlling the opening and closing of the splicing blades.

[0028] Example 3

[0029] As described in Example 1, the device for balancing the internal temperature of the battery module further includes an angle of 54° between the open splicing blades and the vertical direction. Experimental verification shows that when the opening angle of the splicing blades is 54°, the liquid in the pipe weighs approximately four times more than when the blades are closed. Under the influence of gravity, the liquid flow rate in the drainage pipe increases, the heat exchange rate accelerates, and the temperature at that location is rapidly reduced, resulting in a more balanced internal temperature within the module and improved battery module performance.

[0030] Example 4

[0031] As described in Example 1, the device for balancing the internal temperature of the battery module further includes a lower section of the drain pipe 3 corresponding to the height of the individual battery cell 9; the upper section of the drain pipe extends above the individual battery cell 9.

[0032] Example 5

[0033] As described in Example 1, the device for balancing the internal temperature of the battery module further includes a limiting baffle on the drain pipe to restrict the opening angle of the splicing blades.

[0034] Example 6

[0035] As described in Example 1, the device for balancing the internal temperature of the battery module further includes all the ends of the drainage pipes connected to the outlet pipe 10 to achieve the collection and discharge of coolant.

[0036] Example 7

[0037] A method for balancing the internal temperature of a battery module using the device described in Example 3 includes the following steps:

[0038] When the individual cell 9 is working normally, the liquid inlet is normally open, the upper drainage pipe 1 is closed, the waterproof membrane 5 between adjacent splicing blades folds outward, and the coolant flows through the drainage pipe and exchanges heat with the individual cell 9.

[0039] When a single cell 9 overheats, the splicing blades open to 54°, the upper drainage pipe 1 opens, and the backup liquid inlet 7 opens at the same time. The amount of liquid flowing into the upper drainage pipe 1 per unit time increases. Under the action of gravity, the liquid flow rate in the drainage pipe increases, which quickly reduces the temperature at that location and makes the internal temperature of the battery module more even.

Claims

1. A device for balancing the internal temperature of a battery module, characterized in that, The system includes an outlet pipe located at the top of the battery module and a drainage pipe located on the outer wall of each individual battery cell. The outlet pipe has multiple outlets, including a common inlet and a backup inlet. The drainage pipe includes an upper drainage pipe and a lower drainage pipe. The upper drainage pipe is formed by multiple vertically arranged splicing blades, with the bottom of each splicing blade hinged to the lower drainage pipe, creating an openable structure at the top opening of the upper drainage pipe. The inner wall of the drainage pipe is covered with a waterproof membrane that extends from top to bottom through the entire inner wall of the drainage pipe. The perimeter of the waterproof membrane in the upper drainage pipe section corresponds to the perimeter of the upper drainage pipe when the top opening is open. The outlet is located above the upper drainage pipe. The angle between the open splicing blades and the vertical direction is 54°.

2. The device for balancing the internal temperature of a battery module according to claim 1, characterized in that, The drainage pipe is equipped with a relay to control the opening and closing of the splicing blades.

3. The device for balancing the internal temperature of a battery module according to claim 1, characterized in that, The lower section of the drainage pipe corresponds to the height of the individual battery cell; the upper section of the drainage pipe extends above the individual battery cell.

4. The device for balancing the internal temperature of a battery module according to claim 1, characterized in that, The drainage pipe is equipped with a limiting baffle that restricts the opening angle of the splicing blades.

5. The device for balancing the internal temperature of a battery module according to claim 1, characterized in that, All the drain pipes converge at the end to the outlet pipe, thus achieving the collection and discharge of coolant.

6. A method for balancing the internal temperature of a battery module using the apparatus according to any one of claims 1-5, characterized in that, The steps include the following: When a single battery cell is working normally, the liquid inlet is normally open, the upper drainage pipe is closed, and the waterproof membrane between adjacent splicing blades folds outward. The coolant flows through the drainage pipe and exchanges heat with the single battery cell. When a single cell overheats, the splicing blades open to 54°, the upper drainage pipe opens, and the backup liquid inlet opens simultaneously. The amount of liquid flowing into the upper drainage pipe per unit time increases, and under the action of gravity, the liquid flow rate in the drainage pipe increases, rapidly reducing the temperature at that location and balancing the internal temperature of the battery module.

Images