Liquid-cooled immersed battery box with two channels at top and bottom

Abstract

The invention discloses a top-bottom dual-channel liquid-cooled immersed battery box, which is based on the fact that a battery cell module is directly immersed in insulating synthetic oil, so that a heating source battery cell, an aluminum row and the like are directly and fully contacted with the synthetic oil, the heat dissipation is more uniform and efficient, the temperature gradient of a battery can be effectively reduced, and the local overheating phenomenon is reduced. The main heat dissipation mode is a novel cooling scheme that the heat in the insulating synthetic oil is taken away by conducting the heat of the battery cell, the aluminum row and the like into the insulating synthetic oil and then utilizing two channels of the liquid cooling channel or device and the liquid cooling bottom plate. Compared with a traditional liquid cooling battery box, namely, a mode of cooling by only utilizing a bottom cooling water channel, the liquid cooling battery box has more obvious cooling advantages, and due to the fact that contact conduction has a larger contact surface area, heat exchange can be carried out more efficiently, the problem of the pain point that the head of a battery cell is hot and the foot of the battery cell is cold in traditional liquid cooling is solved, and the service life of the battery cell is prolonged. And compared with a cooling circulation dynamic oil scheme, the cost is lower, and the reliability is higher.

Description

Technical Field

[0001] The present invention relates to the field of battery boxes, and in particular to a top-bottom dual-channel liquid-cooled immersion battery box. Background Art

[0002] Battery modules generate heat during charging and discharging. Excessive temperatures and localized temperature imbalances within the battery can severely reduce battery life. The heat dissipation performance of battery modules is a crucial factor affecting battery performance, efficiency, service life, and safety. Currently, existing liquid-cooled battery box structures all feature cooling channels at the bottom to dissipate heat. However, this can lead to high cell temperatures at the top and low cell temperatures at the bottom, significantly reducing the battery's operating temperature range and the overall battery box's energy efficiency, shortening the battery's service life and potentially posing safety risks.

[0003] Problems with battery boxes in the prior art:

[0004] 1. The temperature distribution of modules in the existing battery box is uneven, resulting in local overheating, which is not conducive to the long-term use of the battery system and the safety and reliability cannot be guaranteed;

[0005] 2. The cooling efficiency of the battery box is low and the temperature range of battery operation is small;

[0006] 3. The liquid-cooled battery boxes used in the market only dissipate heat through liquid cooling at the bottom. The temperature of the battery cell poles and aluminum bars is still too high and is the main heat source, resulting in a large temperature difference between the battery and the battery module.

[0007] 4. The existing immersed battery box has many disadvantages in that it cools by circulating oil or coolant. For example, the circulating oil or coolant has a complex path, compatibility issues such as sealing rings and the inherent characteristics of the materials, etc., there is a risk of oil leakage, after-sales service is difficult and the cost is high. In addition, the equipment cost of circulating cooling oil or coolant is higher, and the volume and mass energy density is not high.

[0008] Therefore, it is necessary for us to improve such a structure to overcome the above-mentioned defects. Summary of the Invention

[0009] The object of the present invention is to provide a top and bottom dual-channel liquid-cooled immersion battery box to solve the problems raised in the above background technology.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A top-bottom dual-channel liquid-cooled immersion battery box comprises a battery box: a battery module is installed in the battery box, the battery box is filled with insulating synthetic oil, the battery module is immersed in the insulating synthetic oil, and at the same time, the left and right sides of the front bottom of the battery box are respectively connected with a liquid-cooled bottom plate liquid outlet pipe and a liquid-cooled bottom plate liquid inlet pipe, and the liquid-cooled bottom plate liquid outlet pipe and the liquid-cooled bottom plate liquid inlet pipe are respectively connected to the two ends of the bottom liquid cooling channel; it also includes a liquid cooling channel, the liquid cooling channel is serpentine as a whole, and the left and right ends of the liquid cooling channel are respectively connected with a liquid cooling channel outlet pipe and a liquid cooling channel inlet pipe; the liquid cooling channel is laid along both sides of the pressure relief hole of the battery module cell; the liquid cooling channel is located directly above the battery module, and an insulating sheet is also provided between the liquid cooling channel and the battery module.

[0012] Furthermore, the insulating sheet is provided with a through groove corresponding to the pressure relief hole of the battery module cell.

[0013] Furthermore, the liquid cooling channel is processed from profiles.

[0014] Furthermore, the liquid cooling channel pipeline is bent into shape.

[0015] Furthermore, the liquid cooling channel is made of plastic injection molding.

[0016] Furthermore, the top liquid cooling channel and the bottom liquid cooling channel operate independently or together.

[0017] The liquid cooling bottom plate outlet pipe, the liquid cooling channel outlet pipe, the top liquid cooling channel and the bottom liquid cooling channel are all fixed to the front panel of the battery box through nuts and sealing rings.

[0018] Furthermore, the coolant enters from the two liquid inlet pipes of the liquid cooling base plate and the cold channel inlet pipe on the right side, returns from the two liquid outlet pipes of the liquid cooling base plate and the liquid cooling channel outlet pipe on the left side, and is cooled simultaneously through the top liquid cooling channel and the bottom liquid cooling channel, so that the heat generated by the battery cell is cooled down through heat exchange with the cooling system.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The synthetic oil used in the immersed battery box has the advantages of high flash point, good insulation and large specific heat capacity, which can put the battery box in a safer environment than ordinary liquid cooling and can effectively ensure the fire protection of the battery box.

[0021] 2. The dual-channel liquid cooling solution ensures that the battery cells are in a temperature range that is more friendly to battery cell performance. Even with continuous charging and discharging, the temperature rise and maximum temperature still have obvious advantages over the current liquid cooling method, greatly reducing the probability of thermal runaway of the battery cells from the source. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1This is an exploded view of a top and bottom dual-channel liquid-cooled immersion battery box.

[0023] Figure 2 This is a schematic diagram of the structure of a top and bottom dual-channel liquid-cooled immersion battery box.

[0024] Figure 3 This is a front view of a top and bottom dual-channel liquid-cooled immersion battery box.

[0025] Figure 4 A top view of a dual-channel liquid-cooled immersion battery box with top and bottom channels.

[0026] Figure 5 This is a schematic diagram of the structure of the bottom liquid cooling channel in a top and bottom dual-channel liquid-cooled immersion battery box.

[0027] Figure 6 Schematic diagram of the internal structure of a top-bottom dual-channel liquid-cooled immersion battery box designed for dry and wet partitions.

[0028] Figure 7 Schematic diagram of the internal structure of a top-bottom dual-channel liquid-cooled immersion battery box designed for full immersion. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-5 , a top and bottom dual-channel liquid-cooled immersion battery box, comprising a battery box 1:

[0031] The battery box 1 is filled with insulating synthetic oil, and the battery module 3 is immersed in the insulating synthetic oil. The left and right sides of the front bottom of the battery box 1 are connected to a liquid cooling bottom plate outlet pipe 101 and a liquid cooling bottom plate inlet pipe 102, respectively. The liquid cooling bottom plate outlet pipe 101 and the liquid cooling bottom plate inlet pipe 102 are connected to the two ends of the bottom liquid cooling channel 103, respectively.

[0032] The top liquid cooling channel 2 is also included. The top liquid cooling channel 2 is serpentine in shape. The left and right ends of the top liquid cooling channel 2 are respectively connected with a top liquid cooling channel liquid outlet pipe 201 and a top liquid cooling channel liquid inlet pipe 202. The top liquid cooling channel 2 is laid along both sides of the pressure relief hole of the battery cell of the battery module 3.

[0033] The top liquid cooling channel 2 is located directly above the battery module 3, and an insulating sheet 4 is provided between the top liquid cooling channel 2 and the battery module 3. The insulating sheet 4 has a through groove corresponding to the pressure relief hole of the battery cell of the battery module 3;

[0034] In this solution, the liquid cooling bottom plate liquid outlet pipe 101, the liquid cooling bottom plate liquid inlet pipe 102, the top liquid cooling channel liquid outlet pipe 201 and the top liquid cooling channel liquid inlet pipe 202 are sealed to the panel of the battery box 1 through nuts and sealing rings.

[0035] In this solution, the top liquid cooling channel can be produced by different materials and processing techniques such as profile processing, pipe bending, or plastic injection molding.

[0036] like Figure 6 As shown, the immersion battery box with dry and wet partition design concept we use, that is, a partition 103 is set in the battery box 1 to separate the communication and other electrical components from the battery core, which can further ensure that the system will not leak due to problems such as aging of the sealing ring during long-term operation. However, whether it is applied to the dry and wet partition immersion battery box as shown in the attached Figure 6 Or is it a fully immersed battery box (i.e. there is no partition in the battery box) as shown in the attached Figure 7 , all rights belong to this patent.

[0037] This solution is a dual-channel liquid cooling solution. The top liquid cooling channel and the bottom liquid cooling channel operate independently or together to cool the battery and battery modules at the same time.

[0038] The following describes the following methods for laying and securing the liquid cooling channel: First, install the bottom liquid cooling channel in the battery box, then install the battery module in the battery box, and then secure an insulating sheet on top of the battery module. The top liquid cooling channel should be laid flat on top of the insulating sheet, primarily along the sides of the battery cell pressure relief holes, and away from directly above conductive objects such as aluminum busbars. This will enhance insulation performance and ensure electrical safety. Next, use nuts and sealing rings to secure the water inlet and outlet to the battery box panel to ensure the overall sealing of the box. The cooling pipes can be tied to the insulating sheet at the point away from the conductive objects with cable ties or secured with structural adhesive to ensure the liquid cooling channel is not loose.

[0039] The principle of this solution is that coolant enters through two inlet pipes on the right side and returns through two outlet pipes on the left side. Cooling is performed simultaneously through the top and bottom liquid cooling channels, allowing the heat generated by the battery cells to be cooled through heat exchange with the cooling system. This invention allows for efficient heat exchange and cooling from the top and bottom of the immersion oil, improving overall cooling efficiency, extending battery life, and enhancing safety.

[0040] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "left," "right," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, terms such as "disposed" and "connected" should be understood broadly. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection, an indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

Claims

1. A top-bottom dual-channel liquid-cooled immersion battery box, comprising a battery box: a battery module is installed in the battery box, the battery box is filled with insulating synthetic oil, the battery module is immersed in the insulating synthetic oil, and at the same time, the left and right sides of the front bottom of the battery box are respectively connected with a liquid-cooled bottom plate liquid outlet pipe and a liquid-cooled bottom plate liquid inlet pipe, and the liquid-cooled bottom plate liquid outlet pipe and the liquid-cooled bottom plate liquid inlet pipe are respectively connected to the two ends of the bottom liquid cooling channel; it also includes a liquid cooling channel, the liquid cooling channel is serpentine as a whole, and the left and right ends of the liquid cooling channel are respectively connected with a liquid cooling channel outlet pipe and a liquid cooling channel inlet pipe; the liquid cooling channel is laid along both sides of the pressure relief hole of the battery module cell; the liquid cooling channel is located directly above the battery module, and an insulating sheet is also provided between the liquid cooling channel and the battery module.

2. The top and bottom dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that: The insulating sheet is provided with a through groove at a position corresponding to the pressure relief hole of the battery module cell.

3. The top and bottom dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that: The liquid cooling channel is processed from profiles.

4. The top and bottom dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that: The liquid cooling channel pipeline is bent into shape.

5. The top and bottom dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that: The liquid cooling channel is made of plastic injection molding.

6. The top and bottom dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that: The top liquid cooling channel and the bottom liquid cooling channel operate independently or together.

7. The top and bottom dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that: The liquid cooling bottom plate liquid outlet pipe, the liquid cooling channel liquid outlet pipe, the top liquid cooling channel and the bottom liquid cooling channel are all fixed to the front panel of the battery box through nuts and sealing rings.

8. The top and bottom dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that: The coolant enters from the two liquid inlet pipes of the liquid cooling base plate and the cold channel inlet pipe on the right side, and returns from the two liquid outlet pipes of the liquid cooling base plate and the liquid cooling channel outlet pipe on the left side. It is cooled simultaneously through the top liquid cooling channel and the bottom liquid cooling channel, so that the heat generated by the battery cell is cooled down through heat exchange with the cooling system.

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