Battery cell heat dissipation structure
By designing a hollow heat dissipation plate structure at the tab position of the pouch battery, forced convection heat dissipation of the tab is achieved by using fluid to directly act on the metal connecting plate, which solves the problem of high temperature of the tab and improves the heat dissipation efficiency and safety of the cell.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-04-03
AI Technical Summary
In existing technologies, the tabs of pouch batteries are located in areas with concentrated high temperatures and generate a lot of heat, but there is a lack of direct cooling solutions, resulting in poor heat dissipation.
A cell heat dissipation structure was designed, including hollow first and second heat dissipation plates. The heat dissipation fluid is introduced through the fluid inlet and outlet and acts directly on the metal connecting plate through the electrode heat dissipation holes to achieve forced convection heat dissipation of the electrode.
It effectively reduces the temperature of the electrode tabs, improving the safety and heat dissipation of the battery cell.
Smart Images
Figure CN224082496U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of battery cell heat dissipation, and specifically relates to a battery cell heat dissipation structure. Background Technology
[0002] Soft-pack batteries use an aluminum-plastic composite film as the outer shell, while traditional hard-pack batteries use metal materials as the outer shell. The main advantages of soft-pack batteries include good safety, light weight, high energy density, good electrochemical performance and long life. For soft-pack batteries, in order to ensure the smooth use of soft-pack batteries, it is usually necessary to dissipate heat from the internal cells. However, due to the difficulty in assembling soft-pack batteries, a large number of structural components are required and there is a lack of metal outer shells for heat dissipation.
[0003] For pouch battery cells, the tabs are a high-temperature concentrated area, especially under high-rate conditions. At high rates, the heat generated by the tabs may account for 10% to 40% of the total heat. In current technology, heat dissipation is generally carried out on the battery cell, and there is no solution to directly cool the tabs. Utility Model Content
[0004] To address the aforementioned technical problems, this utility model provides a battery cell heat dissipation structure to solve the problems described in the background section.
[0005] The present invention provides the following technical solution: a battery cell heat dissipation structure, including a heat dissipation component and a battery cell disposed on both sides of the heat dissipation component, wherein the battery cell is fixed with tabs;
[0006] The heat dissipation assembly includes a first heat dissipation plate and a second heat dissipation plate fixed on the first heat dissipation plate. The first heat dissipation plate and the second heat dissipation plate are both hollow and interconnected. A plurality of metal connecting plates corresponding to the tabs are adhered to the second heat dissipation plate. The tabs are welded to the metal connecting plates. The second heat dissipation plate is provided with through-holes for the tabs. The metal connecting plates cover the corresponding tabs for the heat dissipation. The bottom of the first heat dissipation plate is provided with a fluid inlet and a fluid outlet.
[0007] Compared with the prior art, the beneficial effects of this application are as follows: the heat dissipation fluid is sequentially introduced into the first heat dissipation plate and the second heat dissipation plate through the fluid inlet, and the heat dissipation fluid is directly applied to the metal connecting plate through the electrode heat dissipation hole. The metal connecting plate directly dissipates heat and cools the electrode, thereby achieving forced convection heat dissipation of the electrode, effectively cooling the electrode while ensuring the safety of the battery cell.
[0008] Preferably, the top of the second heat sink is provided with several mounting slots corresponding to the metal connecting plate.
[0009] Preferably, the mounting groove is provided with a plurality of isolation bosses for separating the metal connecting plates.
[0010] Preferably, the bottom of the second heat sink is tapered.
[0011] Preferably, a plurality of limiting plates for defining the position of the battery cell are fixed on the first heat sink.
[0012] Preferably, a number of mounting posts are fixed to the bottom of the first heat sink.
[0013] Preferably, the first heat sink has a plurality of heat dissipation holes densely distributed thereon, the heat dissipation holes including first heat dissipation holes and second heat dissipation holes.
[0014] Preferably, the density of the heat dissipation holes near the fluid outlet is greater than the density of the heat dissipation holes near the fluid inlet.
[0015] Preferably, the first heat sink is provided with a plurality of flow guide walls, which are located at the junction of the fluid inlet and the fluid outlet.
[0016] Preferably, the first heat sink is provided with a plurality of evenly distributed and inclined elastic support members. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 A perspective view of the cell heat dissipation structure provided in an embodiment of this utility model;
[0019] Figure 2 An exploded view of the cell heat dissipation structure provided in an embodiment of this utility model;
[0020] Figure 3 The fluid inlet and its structural diagram are provided for embodiments of this utility model.
[0021] Figure 4 This is a diagram showing the internal structure of the first heat sink provided in an embodiment of the present invention.
[0022] Explanation of reference numerals in the attached figures:
[0023] battery cells 1 pole ear 2 Heat dissipation components 3 First heat sink 31 Limit plate 32 Second heat sink 33 Mounting slot 34 Isolation boss 35 First heat dissipation hole 36 Second heat dissipation hole 37 fluid inlet 38 Fluid outlet 39 Mounting column 310 tab heat dissipation holes 311 Guide wall 312 elastic support 313 Metal connecting plate 4
[0024] The present invention will be further described below with reference to the accompanying drawings and description. Detailed Implementation
[0025] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.
[0026] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0028] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.
[0029] In one embodiment of this utility model, such as Figure 1-3 As shown, a battery cell heat dissipation structure includes a heat dissipation component 3 and battery cells 1 disposed on both sides of the heat dissipation component 3, wherein the battery cells 1 are fixed with tabs 2.
[0030] Specifically, the above structure can be understood as two battery cells 1 sandwiching a heat dissipation component 3 or two heat dissipation components sandwiching a battery cell 1. By arranging and replicating the above structure in a specific way, a large and complete battery pack can be obtained. Here, the battery cell 1 is specifically a soft-pack battery cell, and the tab 2 is fixed on the top of the battery cell 1.
[0031] The heat dissipation assembly 3 includes a first heat dissipation plate 31 and a second heat dissipation plate 33 fixed on the first heat dissipation plate 31. The first heat dissipation plate 31 and the second heat dissipation plate 33 are hollow and interconnected. A plurality of metal connecting plates 4 corresponding to the tabs 2 are bonded to the second heat dissipation plate 33. The tabs 2 are welded to the metal connecting plates 4. The second heat dissipation plate 33 is provided with through tab heat dissipation holes 311. The metal connecting plates 4 cover the corresponding tab heat dissipation holes 311. The bottom of the first heat dissipation plate 31 is provided with a fluid inlet 38 and a fluid outlet 39 respectively.
[0032] Specifically, both the first heat sink 31 and the second heat sink 33 are hollow plate structures. The top of the first heat sink 31 is fixedly connected to the bottom of the second heat sink 33, and the inner cavities of the first heat sink 31 and the second heat sink 33 are interconnected to ensure fluid flow. The metal connecting plate 4 can be adhered to the top of the second heat sink 33. The metal connecting plate 4 is generally a right-angled plate structure or a U-shaped plate structure. When installing the metal connecting plate 4, it is necessary to ensure that a part of the metal connecting plate 4 is adhered to the top of the second heat sink 33, and the other part of the metal connecting plate 4 is adhered to the bottom of the second heat sink 33. On the side of the second heat sink 33, at the position corresponding to the tab heat dissipation hole 311, part of the metal connecting plate 4 completely covers the corresponding tab heat dissipation hole 311, and the tab 2 is welded to the side of the metal connecting plate 4 away from the tab heat dissipation hole 311. When the fluid enters the first heat sink 31 and the second heat sink 33 in sequence through the fluid inlet 38, the fluid will act on the metal connecting plate 4 through the tab heat dissipation hole 311, thereby cooling the tab 2. Then, the fluid after heat exchange is output through the fluid outlet 39, thereby achieving forced convection cooling of the tab and improving the cooling effect.
[0033] It should be noted that both the first heat sink 31 and the second heat sink 33 are made of insulating material and can be formed using 3D printing technology.
[0034] In this embodiment, the top of the second heat sink 33 is provided with a plurality of mounting slots 34 corresponding to the metal connecting plate 4;
[0035] Specifically, the shape and position of the mounting groove 34 are adapted to the metal connecting plate 4 to ensure the stability of the metal connecting plate 4.
[0036] In this embodiment, the mounting groove 34 is provided with a plurality of isolation bosses 35 for separating the metal connecting plates 4;
[0037] Specifically, the isolation boss 35 is used to separate two adjacent metal connecting plates 4, and at the same time can prevent the metal connecting plates 4 from shifting.
[0038] In this embodiment, the bottom of the second heat sink 33 is tapered;
[0039] Specifically, the bottom of the second heat sink 33 is tapered, which can also be understood as the top of the second heat sink 33 being thickened, so as to effectively support the metal connecting plate 4 and the tab 2.
[0040] In this embodiment, a plurality of limiting plates 32 for defining the position of the battery cell 1 are fixed on the first heat sink 31;
[0041] Specifically, during actual installation, several battery cells 1 are usually set on one side of the first heat sink 31. In this application, two battery cells 1 are set on each side of the heat sink 3, for a total of four battery cells. The limiting plate 32 is used to limit the battery cells 1 on the same side and prevent them from displacing.
[0042] In this embodiment, a plurality of mounting posts 310 are fixed to the bottom of the first heat sink 31;
[0043] Specifically, by setting up mounting posts 310, a blower can be installed at the bottom of the first heat sink 31.
[0044] In this embodiment, a plurality of heat dissipation holes are densely distributed on the first heat dissipation plate 31, including a first heat dissipation hole 36 and a second heat dissipation hole 37.
[0045] Specifically, by setting a number of densely distributed heat dissipation holes, forced convection heat dissipation can be carried out on the surface of the battery cell 1. The first heat dissipation hole 36 has a square structure and the second heat dissipation hole 37 has a circular structure. At the same time, the first heat dissipation hole 36 and the second heat dissipation hole 37 can also be pentagonal, triangular and other irregular shapes. Setting heat dissipation holes of different shapes can improve the heat dissipation effect and uniformity.
[0046] In this embodiment, the density of the heat dissipation holes near the fluid outlet 39 is greater than the density of the heat dissipation holes near the fluid inlet 38;
[0047] Specifically, as can be seen from the above, the heat dissipation holes near the fluid outlet 39 are more dense, while the heat dissipation holes near the fluid inlet 38 are more sparse. The purpose is to prevent the fluid from being heated as soon as it enters the heat dissipation component 3, thus creating a thermal gradient. It should be noted that the fluid in this application can be air or an insulating cooling liquid. In this application, the fluid is specifically air.
[0048] like Figure 4 As shown, in this embodiment, the first heat sink 31 is provided with a plurality of flow guide walls 312, which are located at the junction of the fluid inlet 38 and the fluid outlet 39.
[0049] Specifically, a flow guide wall 312 is disposed on the first heat sink 31, which is used to divide the internal cavity of the first heat sink 31 into several flow channels. A certain gap is left between the end of the flow guide wall 312 away from the bottom of the first heat sink 31 and the top of the first heat sink 31 to ensure smooth flow of fluid. In this application, there is one fluid inlet 38 and two fluid outlets 39, which are symmetrically disposed on both sides of the fluid inlet 38. Therefore, there are also two flow guide walls 312, which divide the internal cavity of the first heat sink 31 into three flow channels, one for the inlet and the other two for the outlets.
[0050] In this embodiment, a plurality of evenly distributed and inclined elastic support members 313 are fixedly provided inside the first heat sink 31.
[0051] Specifically, the elastic support 313, which is elastically and inclined, can be elastically compressed to accommodate the expansion of the cell 1 during use and provide constant pressure to the cell 15 to maintain the structural stability of the battery system.
[0052] In summary, the cell heat dissipation structure in the above embodiments of this utility model introduces heat dissipation fluid into the first heat dissipation plate 31 and the second heat dissipation plate 33 sequentially through the fluid inlet 38, and directly applies the heat dissipation fluid to the metal connecting plate 4 through the tab heat dissipation hole 311. The metal connecting plate 4 directly dissipates heat and cools the tab 2, thereby achieving forced convection heat dissipation of the tab 2, effectively cooling the tab 2 while ensuring the safety of the cell 1.
[0053] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An electric cell heat dissipation structure, characterized by comprising: The application relates to a heat dissipation assembly and a battery cell fixed on both sides of the heat dissipation assembly, wherein the battery cell is fixed with a tab; The heat dissipation assembly comprises a first heat dissipation plate and a second heat dissipation plate fixed on the first heat dissipation plate, the first heat dissipation plate and the second heat dissipation plate are both hollow and communicate with each other, the second heat dissipation plate is attached with a plurality of metal connecting plates corresponding to the tabs, the tabs are welded on the metal connecting plates, the second heat dissipation plate is provided with tab heat dissipation holes penetrating through the second heat dissipation plate, the metal connecting plates cover the corresponding tab heat dissipation holes, and the first heat dissipation plate is provided with a fluid inlet and a fluid outlet at the bottom.
2. The cell heat dissipation structure according to claim 1, characterized by, The top of the second heat dissipation plate is provided with a plurality of installation grooves corresponding to the metal connecting plates.
3. The cell heat dissipation structure according to claim 2, characterized by, The installation grooves are provided with a plurality of isolation bosses for separating the metal connecting plates.
4. The cell heat dissipation structure according to claim 1, characterized by, The bottom of the second heat dissipation plate is conically arranged.
5. The cell heat dissipation structure according to claim 1, wherein The first heat dissipation plate is fixed with a plurality of limiting plates for limiting the position of the battery cell.
6. The cell heat dissipation structure according to claim 1, wherein The bottom of the first heat dissipation plate is fixed with a plurality of installation columns.
7. The cell heat dissipation structure according to claim 1, wherein The first heat dissipation plate is densely provided with a plurality of heat dissipation holes, and the heat dissipation holes comprise first heat dissipation holes and second heat dissipation holes.
8. The cell heat dissipation structure according to claim 7, wherein The density of the heat dissipation holes close to the fluid outlet is greater than that of the heat dissipation holes close to the fluid inlet.
9. The cell heat dissipation structure according to claim 1, wherein The first heat dissipation plate is provided with a plurality of flow guide walls at the joint position of the fluid inlet and the fluid outlet.
10. The cell heat dissipation structure according to claim 1, wherein The first heat dissipation plate is fixed with a plurality of elastic supporting members which are uniformly distributed and obliquely arranged.