Soft package battery cell heat dissipation structure, minimum unit of battery cell group and battery cell group

Abstract

The utility model relates to the technical field of soft package battery cells, in particular to a soft package battery cell heat dissipation structure, a minimum unit of a battery cell group and the battery cell group. The heat dissipation structure of the soft package battery cell comprises a heat dissipation aluminum sheet and a battery cell supporting structural member used for containing the soft package battery cell, an opening used for exposing an electrode of the soft package battery cell is formed in one side of the battery cell supporting structural member, and a heat conduction pad is arranged in a frame on the side, away from the opening, of the battery cell supporting structural member. The minimum unit of the battery cell group adopting the battery cell supporting structural member not only ensures the structural strength, but also reduces the material types and cost, the accumulated assembly size deviation of the battery cell group consisting of the minimum unit of the battery cell group is small, and meanwhile, the lightweight design on the two dimensions of space volume and weight is realized; and in the aspect of heat dissipation of the battery cell, on the premise of ensuring large-surface and side-surface heat dissipation, the heat dissipation effect of the soft package battery cell under a high-magnification or high-power working condition is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of soft-pack battery cells, in particular to a soft-pack battery cell heat dissipation structure, a minimum unit of a battery cell group, and a battery cell group. Background Art

[0002] Single battery cells commonly used worldwide can be roughly divided into three categories: prismatic, soft-pack, and cylindrical. Each has its own advantages and disadvantages, and their application scenarios vary. Soft-pack cells offer advantages such as high energy density, compact size, light weight, and flexible configuration. They typically support high-rate discharges exceeding 5C, making them suitable for applications requiring high power in a small space. They also have significant market potential in automotive stop-start systems.

[0003] Currently, soft-pack batteries for both high- and low-speed vehicle markets still suffer from complex structures, excessive assembly components, large size, and poor space utilization. Furthermore, most utilize natural cooling, which is ineffective at high-rate discharge. Especially at high currents, soft-pack batteries have poor self-heating capabilities. After assembly, heat is not dissipated promptly, which can easily lead to thermal runaway.

[0004] In the current soft-pack battery cell heat dissipation structure, on the one hand, the commonly used soft-pack battery cell heat dissipation structure is a plastic structural part and a heat dissipation aluminum sheet corresponding to a battery cell. At the same time, the heat dissipation area of ​​the soft-pack battery cell heat dissipation structure basically uses large surfaces and sides for heat dissipation, and the heat dissipation effect is not ideal, which does not meet the current heat dissipation requirements of soft-pack batteries under high-rate or high-power conditions; on the other hand, the existing soft-pack battery cell heat dissipation structure has many parts and a complex structure, resulting in a large cumulative deviation in the size of the assembly of many parts, which is not suitable for assembly in a group manner of multiple battery cells (multiple parallel or multiple series). Utility Model Content

[0005] The purpose of the utility model is to provide a soft-pack battery cell heat dissipation structure, a minimum unit of a battery cell group and a battery cell group, the purpose of which is to enhance the heat dissipation of the bottom area of ​​the soft-pack battery cell heat dissipation structure, thereby improving the heat dissipation efficiency of the soft-pack battery cell under high-rate or high-power working conditions. At the same time, the parts structure used in the prepared soft-pack battery cell heat dissipation structure is simple and regular, and the minimum unit of the prepared battery cell group has a small cumulative deviation during assembly, which simplifies the design of the battery cell support structure, shortens the assembly process route, and improves the assembly accuracy, strength and efficiency.

[0006] In a first aspect, the present application provides a soft-pack battery core heat dissipation structure:

[0007] A soft-pack battery cell heat dissipation structure includes a heat dissipation aluminum sheet and a battery cell support structure for accommodating the soft-pack battery cell. The battery cell support structure is a frame structure. The heat dissipation aluminum sheet is detachably connected to the battery cell support structure and can contact the soft-pack battery cell in the battery cell support structure. One side of the battery cell support structure is provided with an opening for exposing the soft-pack battery cell electrode, and a thermal pad is provided inside the frame of the battery cell support structure away from the opening.

[0008] In this application, a thermal pad is set at the bottom of the battery cell support structure to utilize the area of ​​the bottom area of ​​the battery cell, increase the heat dissipation performance of the bottom of the battery cell support structure, and match it with the heat dissipation aluminum sheet on the side of the battery cell support structure to improve the heat dissipation performance of the soft-pack battery cell under high rate or high power conditions.

[0009] Furthermore, the thermally conductive pad is a thermally conductive insulating pad.

[0010] In this application, the thermal conductive pad is selected as the thermal conductive insulating pad, which not only improves the bottom heat dissipation performance of the soft-pack battery cell heat dissipation structure, but also has a buffering and insulating effect, thereby protecting the soft-pack battery, making the soft-pack battery performance more stable and having a longer service life.

[0011] Furthermore, the frame structure of the heat dissipation aluminum sheet is rectangular, the height of the heat dissipation aluminum sheet is less than or equal to the height of the battery cell support structure; and the width of the heat dissipation aluminum sheet is less than or equal to the width of the battery cell support structure.

[0012] The above technical solution makes the heat dissipation structure of the soft-pack battery more regular and improves the assembly accuracy.

[0013] Furthermore, a boss is provided on the surface of the thermal pad that contacts the battery cell support structure, and the battery cell support structure is provided with an embedding hole into which the boss can be embedded.

[0014] Furthermore, a heat conducting medium is provided on the surface of the heat dissipating aluminum sheet facing the inner cavity of the battery core supporting structure, and the heat conducting medium is heat conducting silicone grease or heat conducting silica gel.

[0015] Furthermore, the heat dissipation aluminum sheet is "L"-shaped, and the heat dissipation aluminum sheet contacts the boss of the thermal pad passing through the embedded hole, so that the heat at the bottom can be conducted out through the heat dissipation aluminum sheet, further improving the heat dissipation performance of the bottom of the soft-pack battery core heat dissipation structure.

[0016] Furthermore, the contact surface between the battery cell support structure and the heat dissipation aluminum sheet is provided with several positioning protrusions, and the heat dissipation aluminum sheet is provided with positioning holes corresponding to the positioning protrusions and capable of accommodating the positioning protrusions; the heat dissipation aluminum sheet and the battery cell support structure are connected by snap fasteners.

[0017] In a second aspect, the present application provides a minimum unit of a battery pack:

[0018] A minimum unit of a battery cell group comprises the soft-pack battery cell heat dissipation structure and the soft-pack battery cell of the present application.

[0019] Furthermore, the interior of a soft-pack battery cell heat dissipation structure can carry one to four soft-pack battery cells, the material of the battery cell support structure is engineering plastic, the bottom of the soft-pack battery cell is in contact with the thermal pad, and the soft-pack battery cell close to the heat dissipation aluminum sheet is in contact with the heat dissipation aluminum sheet. A heat conductive medium is provided between the contact surfaces between the soft-pack battery cells and the contact surfaces between the soft-pack battery cells and the heat dissipation aluminum sheet, and the heat conductive medium is thermal grease or thermal silica gel.

[0020] In the present application, engineering plastics can be used for the battery cell support structure. A soft-pack battery cell heat dissipation structure can carry one to four soft-pack battery cells inside. Not only is the price of the material of the battery cell support structure low, but also a lightweight design is achieved in both spatial volume and weight dimensions. The battery cell support structure carries multiple soft-pack battery cells, which not only has a more stable structure but also reduces the number of parts used. However, if more than four soft-pack battery cells are carried in a battery cell support structure made of engineering plastic, the battery cell support structure will be unstable and easy to deform, which will cause a large deviation in the cumulative assembly size of the assembled battery pack and poor heat dissipation. In the present application, the soft-pack battery cell close to the heat dissipation aluminum sheet is in contact with the heat dissipation aluminum sheet, and a heat-conducting medium is provided between the contact surfaces of the soft-pack battery cell and the soft-pack battery cell, so that the smallest unit of the battery cell group not only has a simple structure but also has better heat dissipation performance.

[0021] In a third aspect, the present application provides a battery pack:

[0022] A battery cell group is composed of the smallest unit of the battery cell group described in this application.

[0023] By using the smallest units of multiple battery cell groups, battery cell groups in the form of "multi-series or multi-parallel" structures can be formed according to actual project requirements. This simplifies the design of the battery cell support structure, shortens the assembly process route, improves assembly accuracy, strength and efficiency, and also greatly improves the heat dissipation efficiency of the battery cells.

[0024] Beneficial effects:

[0025] 1. The minimum unit of the battery cell group satisfies the combination form of 2 parallel or 2 series, which not only ensures the structural strength but also reduces the material types and costs. Under the same conditions, the battery cell group composed of the minimum unit of the battery cell group of this application has a small cumulative assembly size deviation, and at the same time achieves a lightweight design in both spatial volume and weight dimensions; in terms of battery cell heat dissipation, while ensuring large-surface and side heat dissipation, the bottom area of ​​the soft-pack battery cell is utilized, thereby improving the heat dissipation performance of the bottom of the soft-pack battery cell and improving the heat dissipation efficiency of the soft-pack battery cell under high-rate or high-power conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the smallest unit of the battery cell group of Example 1 of the present utility model;

[0027] Figure 2 This is an exploded schematic diagram of the smallest unit of the battery cell group of Example 1 of the present utility model;

[0028] Figure 3 This is a schematic diagram of a battery pack according to Example 1 of the present utility model;

[0029] Figure 4 This is a schematic diagram of the exploded view of the battery cell group of Example 1 of the present utility model.

[0030] Figure numerals: 1. Smallest unit of the battery cell group; 2. Heat dissipation structure of the soft-pack battery cell; 3. Soft-pack battery cell; 4. Thermal pad; 5. Thermal conductive medium; 6. Battery cell group; 31. First battery cell; 32. Second battery cell; 21. Battery cell supporting structure; 22. Heat dissipation aluminum sheet; 23. Opening; 221. Positioning hole; 211. Embedding hole. DETAILED DESCRIPTION

[0031] In order to make the present technical solution clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Example 1

[0033] A minimum unit 1 of a battery pack, combined with Figure 1 and Figure 2 , including a soft-pack battery core heat dissipation structure 2 and a soft-pack battery core 3, the soft-pack battery core 3 includes a first battery core 31 and a second battery core 32 (in other embodiments, any number of soft-pack battery cells from one to four can be set according to requirements).

[0034] The soft-pack battery cell heat dissipation structure 2 includes a heat dissipation aluminum sheet 22 (using an "L"-shaped heat dissipation aluminum sheet 22, and in other embodiments, an "I"-shaped heat dissipation aluminum sheet 22 can be used) and a battery cell support structure 21 (PT material is selected) for accommodating the soft-pack battery cell 3. The battery cell support structure 21 is a rectangular frame structure, and the battery cell support structure 21 is provided with a thermal pad 4 (using a thermal conductive silicone pad). The thermal pad 4 is arranged inside the battery cell support structure 21 and at the bottom of the soft-pack battery cell 3.

[0035] The contact surface between the battery cell support structure 21 and the heat dissipation aluminum sheet 22 is provided with several positioning protrusions; the heat dissipation aluminum sheet 22 is "L"-shaped, and a heat conductive medium 5 (using silicone) is provided on the surface of the heat dissipation aluminum sheet 22 facing the inner cavity of the battery cell support structure 21, which further improves the heat dissipation performance of the smallest unit 1 of the battery cell group.

[0036] The heat dissipation aluminum sheet 22 is connected to the battery cell support structure 21 through a snap-fit ​​connection and contacts the soft-pack battery cell 3 in the battery cell support structure 21; the heat dissipation aluminum sheet 22 is provided with a positioning hole 221 corresponding to the positioning protrusion and capable of accommodating the positioning protrusion on the battery cell support structure 21. The positioning protrusion and the positioning hole 221 cooperate to improve the dimensional stability and dimensional accuracy of the smallest unit 1 of the battery cell group.

[0037] A boss is provided on the surface where the thermal pad 4 contacts the battery cell support structure 21, and the battery cell support structure 21 is provided with an embedding hole 211. The boss can be embedded in the embedding hole 211, thereby improving the stability of the thermal pad 4; the silicone thermal pad 4 with good adhesion performance can improve the stability of the soft-pack battery cell 3 in the battery cell support structure 21; the boss passing through the embedding hole 211 contacts the heat dissipation aluminum sheet 22, and as the number of soft-pack battery cells 3 arranged in the battery cell support structure 21 increases, the part of the "L"-shaped heat dissipation aluminum sheet 22 that contacts the boss is also extended accordingly, ensuring that all bosses of the thermal pad 4 can contact the "L"-shaped heat dissipation aluminum sheet 22, thereby improving the heat dissipation performance of the smallest unit 1 of the battery cell group.

[0038] A battery pack 6, consisting of the minimum unit 1 of the battery pack of the present application, combined with the attached Figure 3 and Figure 4 , the assembly process of battery pack 6 is as follows:

[0039] First, install the "L"-shaped heat dissipation aluminum sheet 22 on the battery cell support structure 21, and position it by embedding the two positioning point protrusions of the battery cell support structure 21 into the positioning holes 221 on the "L"-shaped heat dissipation aluminum sheet 22, and then fix the "L"-shaped heat dissipation aluminum sheet 22 to the battery cell support structure 21 through four clips.

[0040] Then, the thermal pad 4 is pasted on the bottom of the battery cell support structure 21, and the boss of the thermal pad 4 is inserted into the embedded hole 211 on the battery cell support structure 21; then, a thermal conductive medium 5 (thermal conductive silica gel) is evenly applied on the inner side of the "L"-shaped heat dissipation aluminum sheet 22, and the first soft-pack battery cell 3 that meets the "series" requirement is installed in the battery cell support structure 21 and is tightly attached to the "L"-shaped heat dissipation aluminum sheet 22 (in other embodiments, the soft-pack battery cell 3 in the minimum unit 1 of the battery cell group can be connected in "parallel" according to actual needs), and the bottom of the first soft-pack battery cell 3 is tightly attached to the thermal pad 4; the thermal conductive medium 5 (thermal conductive silica gel) is evenly applied on the large surface of the first battery cell 31 installed in the battery cell support structure 21; finally, the second battery cell 32 is installed in the battery cell support structure (the thermal conductive medium 5 is evenly applied on both large surfaces of the second battery cell 32) and is tightly attached to the first battery cell 31, and the bottom of the second battery cell 32 is tightly attached to the thermal pad 4, thus completing the assembly of the minimum unit 1 of the battery cell group.

[0041] Finally, the minimum units 1 of the plurality of battery cell groups are connected in series (in other embodiments, the minimum units 1 of the battery cell group 6 may be connected in parallel as required) to obtain the battery cell group 6 .

[0042] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make several modifications and improvements without departing from the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A soft-pack battery core heat dissipation structure, characterized in that: It includes a heat dissipation aluminum sheet and a battery cell support structure for accommodating soft-pack battery cells. The battery cell support structure is a frame structure. The heat dissipation aluminum sheet can be detachably connected to the battery cell support structure and can contact the soft-pack battery cells in the battery cell support structure. One side of the battery cell support structure is provided with an opening for exposing the soft-pack battery cell electrodes, and a thermal pad is provided inside the frame of the battery cell support structure away from the opening.

2. The soft-pack battery core heat dissipation structure according to claim 1, characterized in that: The thermally conductive pad is a thermally conductive insulating pad.

3. The soft-pack battery core heat dissipation structure according to claim 1, characterized in that: The frame structure of the heat dissipation aluminum sheet is rectangular, the height of the heat dissipation aluminum sheet is less than or equal to the height of the battery core support structure; the width of the heat dissipation aluminum sheet is less than or equal to the width of the battery core support structure.

4. The soft-pack battery core heat dissipation structure according to claim 1, characterized in that: A boss is provided on the surface of the thermal pad that contacts the battery cell support structure, and the battery cell support structure is provided with an embedding hole into which the boss can be embedded.

5. The soft-pack battery core heat dissipation structure according to claim 4, characterized in that: A heat-conducting medium is provided on the surface of the heat-dissipating aluminum sheet facing the inner cavity of the battery core supporting structure, and the heat-conducting medium is heat-conducting silicone grease or heat-conducting silica gel.

6. The soft-pack battery core heat dissipation structure according to claim 5, characterized in that: The heat dissipation aluminum sheet is "L"-shaped and contacts the boss passing through the embedding hole.

7. The soft-pack battery core heat dissipation structure according to claim 1, characterized in that: The contact surface between the battery core support structure and the heat dissipation aluminum sheet is provided with a plurality of positioning protrusions, and the heat dissipation aluminum sheet is provided with positioning holes corresponding to the positioning protrusions and capable of accommodating the positioning protrusions; the heat dissipation aluminum sheet and the battery core support structure are connected by snap fasteners.

8. A minimum unit of a battery pack, characterized in that: The invention comprises the soft-pack battery core heat dissipation structure and the soft-pack battery core according to any one of claims 1 to 7.

9. The minimum unit of the battery pack according to claim 8, characterized in that: One of the soft-pack battery cell heat dissipation structures carries one to four soft-pack battery cells inside, the material of the battery cell support structure is engineering plastic, the bottom of the soft-pack battery cell is in contact with the thermal pad, the soft-pack battery cell close to the heat dissipation aluminum sheet is in contact with the heat dissipation aluminum sheet, and a heat conductive medium is provided between the contact surfaces between the soft-pack battery cells and the contact surfaces between the soft-pack battery cells and the heat dissipation aluminum sheet, and the heat conductive medium is thermal grease or thermal silica gel.

10. A battery cell pack, characterized in that: The battery cell group is composed of two or more minimum units of any one of claims 8 to 9.

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