Heating system and power battery
By simplifying the structure and process of the heating system and adopting an innovative design of metal plates and heating wire assemblies, the problems of complex processes and high costs in existing technologies have been solved, achieving efficient heating of the battery pack and reduction of cell temperature difference in low-temperature environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI XUANYI NEW ENERGY DEV CO LTD
- Filing Date
- 2025-03-26
- Publication Date
- 2026-04-14
AI Technical Summary
Existing heating systems have complex manufacturing processes and high costs. Furthermore, the electrochemical reaction rate of the battery pack decreases and the internal resistance of the battery increases at low temperatures, affecting performance and lifespan.
The design employs metal plate assemblies and heating wire assemblies, eliminating the copper foil etching process. Heating wires are installed using stamped grooves, and high and low power density heating wires are rationally arranged. Aluminum plates and thermally conductive structural adhesives are used for fixation, and silicone is wrapped around the heating wires. A buffer and heat insulation pad structure is designed.
The structure and manufacturing process of the heating system have been simplified, reducing production pollution emissions and costs, lowering the temperature difference between battery cells, and improving the low-temperature heating performance of the battery pack.
Smart Images
Figure CN224124281U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of lithium-ion battery technology, specifically relating to a heating system and a power battery. Background Technology
[0002] In recent years, the electric vehicle industry has developed rapidly, and the battery pack, as the main power source of electric vehicles, is particularly important for its operational stability. Battery packs experience problems such as decreased electrochemical reaction rates and increased internal resistance at low temperatures, thus affecting their performance and lifespan. To address this issue, existing technologies often incorporate heating systems.
[0003] like Figure 1 As shown, the widely used heating systems currently include heating films and heating cores. The heating films are generally made of silicone or PI materials, while the heating cores are generally made of copper foil with a thickness of less than 0.1 mm. The copper foil needs to be etched to produce the required heating area and heating power. The process is complex, the production process generates a lot of pollution, and the system cost is high. Utility Model Content
[0004] To address the aforementioned problems, this utility model proposes a heating system and a power battery, which not only simplifies the structure and manufacturing process of the heating system, reduces pollution emissions and manufacturing costs during production, but also reduces the temperature difference of the battery cells during the heating process.
[0005] To achieve the above-mentioned technical objectives and effects, this utility model is implemented through the following technical solution:
[0006] In a first aspect, this utility model provides a heating system, comprising:
[0007] A metal plate assembly comprising a number of metal plates arranged in sequence;
[0008] Several heating wire assemblies, each including a high-power-density heating wire and a low-power-density heating wire connected together, wherein the high-power-density heating wire is fixed to the middle part of the corresponding metal plate; and the low-power-density heating wire is fixed to the end of the corresponding metal plate.
[0009] In the above solution, while ensuring performance requirements and process standards, the complex copper foil etching process is eliminated. Only grooves need to be stamped on the metal plate, and then the heating wire assemblies are installed into the corresponding grooves. The heating wire assemblies on each metal plate are connected in series. This not only simplifies the structure and manufacturing process of the heating system but also reduces pollution emissions and manufacturing costs during production. Furthermore, the rational arrangement of the high-power-density and low-power-density heating wires in this invention reduces the temperature difference within the battery cell during the heating process.
[0010] In conjunction with the first aspect, optionally, the width of the metal plate in the middle is less than the width at at least one end. Preferably, the width of the metal plate in the middle is less than the width at both ends.
[0011] In the above scheme, the metal plate is set to be thick at the ends and thin in the middle, which increases the heat-receiving area of the end cells and can reduce the temperature difference of the cells during the heating process.
[0012] In conjunction with the first aspect, the metal plate may optionally be an aluminum plate.
[0013] In the above scheme, aluminum plate is selected as the metal plate because it is inexpensive and easy to purchase, thus controlling costs while meeting the basic performance requirements of the battery pack.
[0014] In conjunction with the first aspect, the metal plate may optionally be H-shaped or C-shaped.
[0015] In the above scheme, by setting the metal plate to an I-shape or C-shape, the requirements of being thick at both ends and thin in the middle are met, and manufacturing and production are facilitated. When both I-shaped and C-shaped metal plates exist, the C-shaped metal plate is placed on the far right, and the rest are I-shaped metal plates.
[0016] In conjunction with the first aspect, optionally, the number of low-power-density heating wires in a single heating wire assembly is 2, and both ends of the low-power-density heating wires are connected to high-power-density heating wires.
[0017] The above solution provides specific quantities and installation locations for high-power-density and low-power-density heating wires, which can effectively reduce the temperature difference of the battery cells during the heating process.
[0018] In conjunction with the first aspect, optionally, the high-power-density heating wires in adjacent heating wire assemblies are connected by wires.
[0019] The above scheme specifies the exact connection relationship between adjacent heating wire assemblies, which facilitates actual production.
[0020] In conjunction with the first aspect, optionally, the surface of the metal plate is provided with grooves distributed along the four sides of the metal plate, and the heating wire assembly is fixed in the grooves of the metal plate by thermally conductive structural adhesive.
[0021] In the above scheme, in order to improve the structural stability of the entire heating system, it is proposed to fix it in the groove of the metal plate by means of thermally conductive structural adhesive.
[0022] In conjunction with the first aspect, optionally, both the high-power-density heating wire and the low-power-density heating wire have a glass fiber core at their center, with a heating wire wound around the outside of the glass fiber core, and the outer layer of the heating wire is wrapped with silicone.
[0023] In the above scheme, the fiberglass core serves as the skeleton of the heating wire, providing tensile strength and preventing breakage during assembly or use. A very fine constantan heating wire is wound around the fiberglass core; by adjusting the winding pitch, the target resistance and resistance density can be obtained. A layer of approximately 1mm thick silicone is wrapped around the heating copper wire to protect it and provide insulation.
[0024] In conjunction with the first aspect, optionally, the winding pitch of the heating wire in the high power density heating wire is smaller than that of the heating wire in the low power density heating wire.
[0025] In the above scheme, the target resistance and resistance density are obtained by adjusting the winding pitch. The method is simple and easy to operate.
[0026] In conjunction with the first aspect, the heating system may optionally include a buffer insulation pad that covers the metal plate assembly and the two are identical in shape.
[0027] In the above solution, by rationally designing the structure of the buffer heat insulation pad, the amount of buffer heat insulation pad used can be effectively reduced. In this way, the buffer heat insulation pads used for the two sets of metal plates can be made into complementary cuts, which can reduce the amount of pads used by more than 40% compared to covering the entire bottom surface of the module with foam.
[0028] Secondly, this utility model provides a power battery, including the heating system described in any one of the first aspects.
[0029] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0030] This invention proposes a heating system and power battery that, while ensuring performance requirements and process standards, eliminates the complex copper foil etching process. Instead, it only requires stamping grooves on a metal plate and then installing heating wire assemblies into the corresponding grooves. The heating wire assemblies on each metal plate are connected in series. This not only simplifies the structure and manufacturing process of the heating system but also reduces pollution emissions and manufacturing costs. Furthermore, this invention uses a metal plate structure that is thicker at both ends and thinner in the middle, increasing the heat-receiving area of the end cells. The reasonable arrangement of high-power-density and low-power-density heating wires also reduces the temperature difference between the cells during the heating process.
[0031] Furthermore, this invention selects aluminum plate as the metal plate because it is inexpensive and readily available, thus enabling cost control while meeting the basic performance requirements of the battery pack.
[0032] Furthermore, by rationally designing the structure of the buffer and heat insulation pad, this invention can effectively reduce the amount of buffer and heat insulation pad used. Thus, the buffer and heat insulation pads used for the two sets of metal plates can be made with complementary cuts, reducing the amount used by more than 40% compared to covering the entire bottom surface of the module with foam. Attached Figure Description
[0033] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:
[0034] Figure 1 This is a schematic diagram of the structure of a heating system in the prior art;
[0035] Figure 2 This is a schematic diagram of the heating system according to an embodiment of the present invention;
[0036] Figure 3 This is a cross-sectional schematic diagram of the heating wire according to an embodiment of the present invention;
[0037] Figure 4 This is a schematic diagram of the structure of a buffer heat insulation pad according to an embodiment of the present invention;
[0038] Figure 5(a) is a cloud map of the surface temperature distribution of the battery cell obtained by applying the heating system to a low-temperature heating simulation of a battery pack;
[0039] Figure 5(b) shows the temperature distribution on the bottom surface of the battery cell obtained by applying the heating system to a low-temperature heating simulation of a battery pack;
[0040] Figure 5(c) shows the temperature distribution of the metal plate obtained by applying the heating system to a low-temperature heating simulation of a battery pack;
[0041] Figure 5(d) shows the temperature distribution cloud map of the heating wire assembly obtained by applying the heating system to a low-temperature heating simulation of a battery pack;
[0042] The components are: 1-metal plate, 2-wire, 3-high power density heating wire, 4-low power density heating wire, 5-buffered heat insulation pad, 6-fiberglass core, 7-heating wire, 8-silicone. Detailed Implementation
[0043] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the scope of protection of this utility model.
[0044] In the description of this utility model patent, it should be noted that the terms "upper", "lower", "left", "right", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model patent 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 patent.
[0045] In the description of this utility model patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0046] The application principle of this utility model will be described in detail below with reference to the accompanying drawings. Example 1
[0047] This embodiment provides a heating system, such as Figure 2 As shown, it includes: a metal plate assembly 1 and several heating wire assemblies;
[0048] The metal plate 1 assembly includes a plurality of metal plates 1 arranged in sequence;
[0049] Each heating wire assembly includes interconnected high-power-density heating wires 3 ( Figure 2 (The yellow line in the middle) and low power density heating wire 4 ( Figure 2 (The coffee-colored line in the middle), the high power density heating wire 3 is fixed in the middle part of the corresponding metal plate 1; the low power density heating wire 4 is fixed at the end of the corresponding metal plate 1.
[0050] In the above solution, while ensuring performance requirements and process standards, the complex copper foil etching process is eliminated. It only requires stamping grooves on the metal plate 1, and then installing the heating wire assemblies into the corresponding grooves. The heating wire assemblies on each metal plate 1 are connected in series. This not only simplifies the structure and manufacturing process of the heating system but also reduces pollution emissions and manufacturing costs during production. Furthermore, the reasonable arrangement of the high-power-density heating wire 3 and the low-power-density heating wire 4 in this invention can reduce the temperature difference of the battery cell during the heating process.
[0051] In one specific embodiment of this utility model, the width of the metal plate 1 in the middle is smaller than the width of at least one end. Preferably, the width of the metal plate 1 in the middle is smaller than the width of both ends.
[0052] In the above scheme, the metal plate 1 is set to be thick at the end and thin in the middle, which increases the heat-receiving area of the end cell (because the heat dissipation area of the end cell is large, more heat absorption is required), which can reduce the temperature difference of the cell during the heating process.
[0053] In one specific embodiment of this utility model, the metal plate 1 is an aluminum plate.
[0054] In the above scheme, aluminum plate is chosen as metal plate 1 because it is inexpensive and readily available, thus controlling costs while meeting the basic performance requirements of the battery pack. In other embodiments of this utility model, other metal materials can also be used for metal plate 1, depending on actual needs.
[0055] In one specific embodiment of this utility model, the metal plate 1 is H-shaped or C-shaped.
[0056] In the above scheme, by setting the metal plate 1 to an I-shape or a C-shape, the requirements of being thicker at both ends and thinner in the middle are met, and it is also convenient for manufacturing and production. When both the I-shaped metal plate 1 and the C-shaped metal plate 1 exist, the C-shaped metal plate 1 is placed on the far right (see...). Figure 2 The blue metal plate in the middle, the rest are I-shaped metal plates 1 (see Figure 2 (The green metal plate in the middle).
[0057] In one specific embodiment of this utility model, the number of low power density heating wires 4 in a single heating wire assembly is 2, and both ends of the low power density heating wires 4 are connected to high power density heating wires 3.
[0058] The above solution provides the specific number and installation position of the high power density heating wire 3 and the low power density heating wire 4, which can effectively reduce the temperature difference of the battery cell during the heating process.
[0059] In one specific embodiment of this utility model, the high power density heating wire 3 in the adjacent heating wire assembly is connected to the conductor 2 ( Figure 2 Connected by the blue line in the middle.
[0060] The above scheme specifies the exact connection relationship between adjacent heating wire assemblies, which facilitates actual production.
[0061] In one specific embodiment of this utility model, the surface of the metal plate 1 is provided with grooves distributed along the four sides of the metal plate, and the heating wire assembly is fixed in the grooves on the metal plate 1 by thermally conductive structural adhesive.
[0062] In the above scheme, in order to improve the structural stability of the entire heating system, it is proposed to fix it in the groove on the metal plate 1 by thermally conductive structural adhesive.
[0063] In one specific embodiment of this utility model, the center of both the high power density heating wire 3 and the low power density heating wire 4 is a glass fiber core 6, the glass fiber core 6 is wrapped with a heating wire 7, and the outer layer of the heating wire 7 is wrapped with silicone 8.
[0064] In the above scheme, the fiberglass core serves as the skeleton of the heating wire, providing tensile strength and preventing breakage during assembly or use. A very fine heating wire (such as constantan heating wire) is wound around the fiberglass core. By adjusting the winding pitch, the target resistance and resistance density can be obtained. A layer of silicone approximately 1mm thick is wrapped around the heating wire to protect it and provide insulation. In practice, the high-power-density heating wire 3 and the low-power-density heating wire 4 are manufactured together, sharing the same fiberglass core; only the winding pitch of the heating wire needs to be changed.
[0065] In one specific embodiment of this utility model, the winding pitch of the heating wire in the high power density heating wire 3 is smaller than that of the heating wire in the low power density heating wire 4.
[0066] In the above scheme, the target resistance and resistance density are obtained by adjusting the winding pitch. The method is simple and easy to operate.
[0067] In one specific embodiment of this utility model, such as Figure 4 As shown, the heating system also includes a buffer heat insulation pad 5, which covers the metal plate 1 assembly, and the two are identical in shape (i.e., the buffer heat insulation pad 5 is only laid on the location where the metal plate 1 is located). In specific implementation, the buffer heat insulation pad 5 can be made of foam, which greatly reduces production costs while ensuring the buffer heat insulation effect.
[0068] In the above solution, by rationally designing the structure of the buffer heat insulation pad 5, the amount of buffer heat insulation pad 5 used can be effectively reduced. In this way, the buffer heat insulation pads 5 used for the two sets of metal plates 1 can be made into complementary cuts, which can reduce the amount used by more than 40% compared to covering the entire bottom surface of the module with foam. Example 2
[0069] This utility model provides a power battery, including the heating system described in any one of Embodiment 1.
[0070] The modeling and simulation results of the heating system used in conjunction with a certain battery pack are shown in Figures 5(a)-5(d). The simulation conditions were an ambient temperature of -20°C, an initial cell temperature of -15°C, and a heating wire power of 700W. The results show that the heating system in this invention can meet the required low-temperature heating performance.
[0071] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A heating system, characterized in that, include: A metal plate assembly comprising a number of metal plates arranged in sequence; Several heating wire assemblies, each including a high-power-density heating wire and a low-power-density heating wire connected together, wherein the high-power-density heating wire is fixed to the middle part of the corresponding metal plate; and the low-power-density heating wire is fixed to the end of the corresponding metal plate.
2. The heating system according to claim 1, characterized in that: The width of the metal plate in the middle is less than the width at at least one end.
3. The heating system according to claim 1, characterized in that: The metal plate is an aluminum plate, and / or the metal plate is I-shaped or C-shaped.
4. A heating system according to claim 1, characterized in that: The number of low-power-density heating wires in a single heating wire assembly is 2, and both ends of the low-power-density heating wires are connected to high-power-density heating wires.
5. A heating system according to claim 1, characterized in that: The high-power-density heating wires in adjacent heating wire assemblies are connected by wires.
6. A heating system according to claim 1, characterized in that: The surface of the metal plate has grooves distributed along the four sides of the metal plate, and the heating wire assembly is fixed in the grooves of the metal plate by thermally conductive structural adhesive.
7. A heating system according to claim 1, characterized in that: Both the high-power-density heating wire and the low-power-density heating wire have a glass fiber core at their center, with a heating wire wrapped around the glass fiber core, and the heating wire is wrapped with silicone.
8. A heating system according to claim 7, characterized in that: The winding pitch of the heating wire in the high power density heating wire is smaller than that of the heating wire in the low power density heating wire.
9. A heating system according to claim 1, characterized in that: The heating system also includes a buffer insulation pad that covers the metal plate assembly, and the two are identical in shape.
10. A power battery, characterized in that, The heating system included in any one of claims 1-9.