Battery module capable of being cooled in large area

Abstract

The utility model relates to the technical field of power batteries, and discloses a battery module capable of being cooled in a large area, which consists of a plurality of battery cells, a positive pole and a negative pole are respectively arranged at two ends of each battery cell, a busbar is arranged between every two adjacent battery cells, and the poles at the same ends of every two adjacent battery cells are connected by the busbars. Two side edges of the busbars along the arrangement direction of the battery cells are bent upwards to form a U-shaped structure, a top cooling plate is arranged above the busbars, the top cooling plate is clamped and fixed in the busbars, and the plurality of busbars are jointly connected by the top cooling plate along the arrangement direction of the battery cells. In practical application, the top cooling plate rapidly cools the whole end face of the busbar, so that the cooling performance of the battery cell is obviously improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery technical field, concretely relates to a battery module of large area cooling. BACKGROUND

[0002] Power battery as the core component of new energy electric vehicle is composed of a plurality of battery cells in series or parallel connection, in the process of charging and discharging, the busbar and the pole, the pole and the welding area become the high heat area of battery cell, the prior art has the scheme that the liquid cooling plate is used to top cooling of the pole lug and the pole, for example, the Chinese patent with publication number CN117996261A, battery module, battery pack and vehicle, the patent technology discloses that the cooling plate is arranged on the end face of the battery cell with the pole, the busbar is connected with the pole and the cooling plate, so that the heat generated by the mechanical parts such as the winding pole lug in the battery cell can be quickly taken away by the cooling plate through the pole and the busbar, but the cooling effect of the above technical scheme is limited, and the difficulty of later maintenance is great. CONTENT OF UTILITY MODEL

[0003] The utility model intends to provide a battery module of large area cooling to improve the cooling performance of the battery module and realize rapid cooling.

[0004] In order to achieve the above object, the utility model adopts the following technical scheme: a battery module of large area cooling is composed of a plurality of battery cells, the two ends of the battery cell are respectively provided with positive and negative poles, a busbar is arranged between the two adjacent battery cells, the busbar connects the poles of the same end of the two adjacent battery cells, the two side edges of the busbar along the arrangement direction of the battery cell are all upwardly bent to make the busbar form a U-shaped structure, a top cooling plate is arranged above the busbar, the top cooling plate is clamped and fixed in the busbar, and the top cooling plate connects the plurality of busbars together along the arrangement direction of the battery cell.

[0005] The principle and advantages of the scheme are as follows:

[0006] 1. Compared with the prior art in which the busbar is used as the connecting medium to connect the poles and the top cooling plate, in the scheme, the busbar is designed into a U-shaped structure, and the top cooling plate is directly clamped and fixed in the U-shaped busbar, so that the poles, the busbar and the top cooling plate are arranged in an up-down distribution structure, the welding area of the busbar and the poles is fully covered, the contact area between the top cooling plate and the busbar is increased by about the whole upper end surface area of the busbar, the cooling area is increased, rapid cooling in a large area is realized, the temperature of the high heat area such as the pole of the battery cell and the busbar is effectively controlled, and the performance of the battery cell is effectively improved; moreover, the heat dissipation area of the U-shaped busbar is increased, the heat can be more uniformly distributed on the busbar, and the formation of local overheating points is avoided.

[0007] 2. The U-shaped structure gives the busbar a certain degree of elasticity, which can absorb vibrations and impacts from the road surface during vehicle operation, reduce physical damage to the battery cell, effectively protect the battery cell from the influence of external mechanical stress, and improve the mechanical stability of the battery cell.

[0008] 3. The design of the top cooling plate being snapped into the busbar simplifies the installation and disassembly process, making it easy to install and replace the top cooling plate, reducing production difficulty and cost, and improving the efficiency of the production line, especially in large-scale production; it also makes later maintenance more convenient, especially when it is necessary to replace or repair the battery cells, the top cooling plate can be easily removed without affecting the normal operation of other components.

[0009] Furthermore, the top surface of the top cold plate is higher than or flush with the top surface of the manifold that bends upwards.

[0010] The above configuration is designed to ensure that the entire end face of the busbar is in contact with the top cooling plate for cooling, thereby improving cooling performance.

[0011] Furthermore, a thermally conductive layer is provided between the top cooling plate and the busbar, which is a thermally conductive structural adhesive, a thermally conductive gel, or a thermally conductive pad.

[0012] Furthermore, the thickness of the thermally conductive layer is 0.4-2.0 mm.

[0013] A thermally conductive layer is installed between the top cooling plate and the busbar, with a thickness limited to 0.4-2.0mm. This is to ensure that the thermally conductive layer can ensure that the heat is evenly distributed between the top cooling plate and the battery cell, avoiding the formation of local hot spots, thereby maintaining the stability and consistency of the temperature of the entire battery module. Secondly, the thermally conductive layer can provide a buffer to reduce physical damage to the battery cell caused by vibration or impact during charging and discharging.

[0014] Furthermore, the top cooling plate has several mutually separated flow channels, and has an inlet and an outlet at its end.

[0015] Furthermore, the top cooling plate is made of a plastic material with thermal conductivity, and the thickness of the top cooling plate is 2-4 mm.

[0016] Plastic materials can conduct heat while providing electrical insulation, eliminating the need for additional insulation layers or coatings, thus simplifying the process and improving processing efficiency.

[0017] Furthermore, the top cooling plate is made of metal material, with a thickness of 2-4 mm, and the surface of the battery cell and the top cooling plate is provided with an insulating layer or sprayed with an insulating coating.

[0018] Compared to plastic materials, metal materials have higher structural strength, providing better protection for the battery pack when subjected to external impacts or vibrations, preventing deformation or damage to the top cooling plate; moreover, metal top cooling plates have stronger resistance to oxidation and corrosion, allowing them to work stably in humid or corrosive environments for a long time, thus extending the service life of the top cooling plate.

[0019] Furthermore, a heat insulation layer is provided between two adjacent battery cells. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model.

[0021] Figure 2 This is a schematic diagram of the transverse cross section of Embodiment 1 of this utility model.

[0022] Figure 3 This is a structural schematic diagram of Embodiment 2 of the present invention.

[0023] Figure 4 This is a cross-sectional view of Embodiment 2 of the present invention. Detailed Implementation

[0024] The following detailed description illustrates the specific implementation method:

[0025] The reference numerals in the accompanying drawings include: 1. Battery cell; 2. Terminal post; 3. Busbar; 4. Top cooling plate; 5. Insulation layer; 6. Thermal conductive layer.

[0026] Example 1

[0027] The basics are as follows: Figure 1 , Figure 2 As shown: A battery module capable of large-area cooling is composed of several battery cells 1. Each battery cell 1 has a positive and a negative terminal 2 at both ends. A busbar 3 is provided between two adjacent battery cells 1. The busbar 3 welds the terminal 2 at the same end of two adjacent battery cells 1 together. Both sides of the busbar 3 along the arrangement direction of the battery cells 1 are bent upward to form a U-shaped structure. A top cooling plate 4 is provided above the busbar 3. The top cooling plate 4 is snapped and fixed inside the busbar 3. The top cooling plate 4 connects multiple busbars 3 together along the arrangement direction of the battery cells 1.

[0028] The top surface of the top cooling plate 4 is higher than or flush with the top surface of the busbar 3 that bends upwards. This arrangement ensures that the entire U-shaped side of the busbar 3 is in contact with the top cooling plate 4 for cooling, thereby improving cooling performance.

[0029] The top cooling plate 4 forms several mutually separated flow channels, and has an inlet and an outlet at the end. The inlets and outlets of each top cooling plate 4 are respectively connected to the same inlet pipe or outlet pipe. The inlet, outlet and inlet and outlet pipes are not shown in the figure.

[0030] With the above configuration, the busbar 3 is designed as a U-shaped structure, and the top cooling plate 4 is directly snapped into the U-shaped busbar 3, so that the terminal post 2, busbar 3 and top cooling plate 4 are distributed vertically, which fully covers the welding area between the busbar 3 and the terminal post 2. The contact area between the top cooling plate 4 and the busbar 3 is increased to approximately the entire upper surface area of ​​the busbar 3, thereby increasing the cooling area and achieving rapid cooling over a large area. This effectively controls the temperature of high-heat areas such as the terminal post 2 and busbar 3 of the battery cell 1, effectively improving the performance of the battery cell 1. Moreover, the increased heat dissipation area of ​​the U-shaped busbar 3 allows heat to be distributed more evenly on the busbar 3, avoiding the formation of localized hot spots.

[0031] Secondly, the design of the top cooling plate 4 being snapped into the busbar 3 simplifies the installation and disassembly process, making it easy to install and replace the top cooling plate 4, reducing production difficulty and cost, and improving the efficiency of the production line, especially in large-scale production; it also makes later maintenance more convenient, especially when it is necessary to replace or repair the battery cell 1, the top cooling plate 4 can be easily disassembled without affecting the normal operation of other components.

[0032] Preferably, the top cooling plate 4 is made of a thermally conductive plastic material, such as PPS or PS+PPE, with a thickness of 2-4 mm and a wall thickness of 0.3-1.2 mm. The plastic material provides both thermal conductivity and electrical insulation, eliminating the need for a separate insulating layer, simplifying the process, and improving processing efficiency.

[0033] Preferably, the top cooling plate 4 is made of a metal material, such as aluminum-based materials, ternary aluminum, or hexa-based aluminum. The thickness of the top cooling plate 4 is 2-4 mm, and the wall thickness is 0.3-1.2 mm. The surfaces of the battery cell 1 and the top cooling plate 4 are provided with an insulating layer or coated with an insulating paint. Compared with plastic materials, metal materials have higher structural strength, providing better protection when the battery pack is subjected to external impact or vibration, preventing the top cooling plate 4 from deforming or being damaged. Moreover, the metal top cooling plate 4 has stronger oxidation and corrosion resistance, allowing it to work stably for a long time in humid or corrosive environments, thus extending its service life. The total thickness and wall thickness of the top cooling plate 4 are defined according to the actual structure of the top cooling plate 4.

[0034] A heat insulation layer 5 is provided between two adjacent battery cells 1. The heat insulation layer 5 is made of heat insulation materials, such as aerogel and foam, to reduce heat conduction between adjacent battery cells 1 and reduce the risk of local overheating. The heat insulation layer 5 also plays a mechanical protection role while insulating heat and absorbing and buffering external forces.

[0035] Example 2

[0036] like Figure 3 , Figure 4As shown, based on Example 1, this example provides a heat-conducting layer 6 between the busbar 3 and the top cooling plate 4, with a thickness of 0.4-2.0 mm.

[0037] Within this thickness range, the thermal conductive layer 6 can effectively ensure that heat is evenly distributed between the top cooling plate 4 and the cell 1, avoiding the formation of local hot spots, and also allow the thermal conductive layer 6 to play a buffering role, reducing physical damage to the cell 1 caused by vibration or impact during charging and discharging. If the thickness is too small, the thermal conductive layer 6 will not be able to completely fill the tiny gap between the top cooling plate 4 and the cell 1, thereby increasing the contact thermal resistance and reducing the overall heat conduction efficiency. If the thickness is too large, it will hinder the rapid transfer of heat, causing some heat to accumulate near the cell 1, increasing the temperature fluctuation inside the battery module and affecting battery performance.

[0038] The thermally conductive layer 6 can be a thermally conductive structural adhesive, thermally conductive gel, or thermally conductive pad. Different types of thermally conductive materials can be selected and their thickness adjusted according to different application environments and requirements. For example, thermally conductive gel can be selected for applications requiring high thermal conductivity and good elasticity, with a thickness of approximately 1 mm; thermally conductive structural adhesive can be selected for applications requiring strong adhesion, with a thickness of approximately 0.4 mm; and thermally conductive pads can be selected for applications requiring removability and reusability, with a thickness of approximately 1.8 mm.

[0039] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A battery module capable of large-area cooling, comprising several battery cells, each battery cell having positive and negative terminals at both ends, and a busbar connecting adjacent battery cells at the same end, characterized in that: The busbar is bent upwards on both sides along the cell arrangement direction to form a U-shaped structure. A top cooling plate is provided above the busbar and is snapped and fixed inside the busbar. The top cooling plate connects multiple busbars together along the cell arrangement direction.

2. The battery module capable of large-area cooling according to claim 1, characterized in that: The top surface of the top cooling plate is higher than or flush with the top surface of the manifold that bends upwards.

3. A battery module capable of large-area cooling according to claim 2, characterized in that: A thermally conductive layer is provided between the top cooling plate and the busbar. The thermally conductive layer is a thermally conductive structural adhesive, a thermally conductive gel, or a thermally conductive pad.

4. A battery module capable of large-area cooling according to claim 3, characterized in that: The thickness of the thermally conductive layer is 0.4-2.0 mm.

5. A battery module capable of large-area cooling according to claim 4, characterized in that: The top cooling plate has several mutually separated flow channels, and has an inlet and an outlet at the end.

6. A battery module capable of large-area cooling according to claim 5, characterized in that: The top cooling plate is made of a thermally conductive plastic material and has a thickness of 2-4 mm.

7. A battery module capable of large-area cooling according to claim 5, characterized in that: The top cooling plate is made of metal material and has a thickness of 2-4mm. The surface of the battery cell and the top cooling plate is provided with an insulating layer or sprayed with an insulating coating.

8. A battery module capable of large-area cooling according to any one of claims 1-7, characterized in that: A heat insulation layer is installed between two adjacent battery cells.

Images