Novel lithium iron phosphate PACK electric group heating structure

Abstract

The novel lithium iron phosphate PACK electric group heating structure comprises a lower cover plate, an electric core bag, an upper cover plate, a welding layer and a heating module, wherein the electric core bag is placed on the lower cover plate; the electric core bag is clamped by the upper cover plate and the lower cover plate; the welding layer is arranged on the upper cover plate and is connected with the electric core bag; the heating module comprises a supporting part and a heating part, the supporting part serves as a frame and is connected with the welding layer through a metal material, and the heating part arranged in the frame of the supporting part wraps a heating wire through an insulating material to transfer heat to the welding layer. According to the utility model, the welding layer is directly heated by the heating module, so that a more efficient heating solution in the battery pack is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of battery manufacturing, especially relates to a novel lithium iron phosphate PACK electric group heating structure. BACKGROUND

[0002] Lithium iron phosphate batteries are widely used in electric vehicles, energy storage systems, and portable electronic devices due to their high safety, long life, good thermal stability, and environmental protection characteristics. Lithium iron phosphate PACK refers to the combination of multiple single lithium iron phosphate batteries through specific electrical and mechanical design, forming a power battery pack that can provide higher voltage and capacity. This PACK not only includes battery cells, but also integrates management systems (BMS), cooling / heating systems, connectors, and other auxiliary components to ensure safe and reliable operation of the entire system.

[0003] In low temperature environments, the performance of lithium iron phosphate batteries will be significantly affected, such as increased internal resistance, reduced charging and discharging efficiency, and even charging difficulties. In order to maintain or restore their performance within the normal operating temperature range, lithium iron phosphate PACKs usually need to be equipped with heating structures. An effective heating solution can ensure that the battery pack quickly heats up to an appropriate operating temperature in cold conditions, thereby improving the energy density utilization rate of the battery and prolonging its service life.

[0004] However, in the current market, the common lithium iron phosphate PACK often uses epoxy plates as insulation layers between the heating film and the battery pack. Although this method can meet the electrical isolation requirements to some extent, it also brings several problems. Due to the relatively low thermal conductivity of epoxy plates, there is a large loss in the process of heat transfer from the heating film to the battery pack, resulting in low heating efficiency. Inefficient heat conduction means that more time is needed to reach the expected operating temperature, which may delay the start of the vehicle or the use of other devices in practical applications. The increased insulation material occupies valuable internal space, limiting the compactness of the overall PACK design, and also increasing the weight. Additional materials and complex design increase manufacturing costs, which is not conducive to large-scale commercialization. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a novel lithium iron phosphate PACK electric group heating structure to solve the technical problem of providing a more efficient heating solution while reducing material usage and reducing costs.

[0006] To achieve the above-mentioned purpose, the specific technical scheme of the novel lithium iron phosphate PACK electric group heating structure of the utility model is as follows:

[0007] The novel lithium iron phosphate PACK battery heating structure comprises a lower cover plate, a battery core package placed on the lower cover plate, an upper cover plate clamping the battery core package with the lower cover plate, a welding layer arranged on the upper cover plate and connected with the battery core package, and a heating module covering the welding layer.

[0008] The heating module comprises a support part and a heating part; the support part is connected with the welding layer and adopts a metal material as a frame; the heating part arranged in the support part frame adopts an insulating material to wrap a heating wire and transfer heat to the welding layer.

[0009] The upper cover plate is provided with a connecting protrusion on the side facing the welding layer; the connecting protrusion extends towards the heating module through the welding layer; the support part is provided with a positioning hole corresponding to the connecting protrusion; the connecting protrusion is provided with a connecting hole with internal threads on the upper end surface; the installation of the heating module on the upper cover plate and the clamping of the welding layer are realized by the bolt passing through the positioning hole and entering the connecting hole.

[0010] As a further improvement of the utility model, the battery core package comprises a plurality of battery core groups; the battery core group comprises a plurality of battery cores; and the welding layer comprises a welding nickel sheet arranged corresponding to the battery core group.

[0011] As a further improvement of the utility model, the inner recess of the upper cover plate is provided with a plurality of installation grooves; the welding nickel sheet enters the installation groove to be connected with the battery core group.

[0012] As a further improvement of the utility model, the installation groove is provided with a positioning pin towards the welding nickel sheet; the welding nickel sheet is provided with a welding positioning hole corresponding to the positioning pin; the welding positioning hole passes through the positioning pin to realize the installation of the welding nickel sheet in the installation groove.

[0013] As a further improvement of the utility model, the installation groove is provided with a welding hole corresponding to the battery core to realize the connection between the welding nickel sheet and the battery core group.

[0014] As a further improvement of the utility model, the connecting protrusion is arranged outside the installation groove.

[0015] As a further improvement of the utility model, one side of the welding nickel sheet is bent to be provided with a wiring end; the wiring end passes through the installation groove and is exposed on the side surface of the upper cover plate for the connection of an external circuit.

[0016] As a further improvement of the utility model, the wiring end is connected with a battery management system through a collection line to feed the real-time parameters of the battery core to the battery management system.

[0017] As a further improvement of the present application, the heating module is in communication with the battery management system and operates under the control of the battery management system.

[0018] As a further improvement of the present application, the welding nickel sheet is provided with a connecting end corresponding to the welding hole, and the connecting end passes through the welding hole and is connected with the electric core. Advantages

[0019] The present application discards the design of adding an epoxy board between the heating film and the battery in the traditional scheme, and instead adopts a separate support part and heating part. The support part made of metal not only serves as a frame to ensure structural stability, but also can directly contact the welding layer to improve heat conduction efficiency. At the same time, the heating part wrapping the heating wire design ensures that heat can be more directly and efficiently transferred to the welding layer, reducing heat loss, thereby improving the efficiency and uniformity of the entire heating process.

[0020] Due to the adoption of an efficient heat conduction path, the time required from starting heating to reaching the working temperature is greatly shortened. This not only improves the battery performance recovery speed in low temperature environment, but also improves the user experience, especially when used in cold areas or winter conditions.

[0021] The heating module is integrated on the upper cover plate, and fastening installation is achieved by using components such as connecting protrusions and positioning holes, which simplifies the overall design. Such design reduces the use of additional materials, especially no longer needs to occupy space for insulation board, making the PACK more compact, which is beneficial to improve the space utilization of vehicles or other equipment.

[0022] The heating module is stably installed on the upper cover plate, avoiding the risk of loosening due to vibration or external impact. In addition, the precise positioning (through positioning pins and welding positioning holes) and reliable electrical connection (with the help of welding holes) between the welding nickel sheet and the electric core group further enhance the safety and reliability of the entire system.

[0023] The design of the wiring end allows the collection line to be connected to the battery management system (BMS), realizing real-time monitoring of the electric core parameters. Combined with the connectivity of the heating module and the BMS, the heating strategy can be dynamically adjusted according to actual needs to ensure the best working state, prolong the battery life and also provide intelligent operation experience for users. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A novel lithium iron phosphate PACK electric group heating structure schematic diagram of the present application;

[0025] Figure 2 An upper cover plate structure schematic diagram;

[0026] Figure 3 This is a schematic diagram of the heating module structure;

[0027] Figure 4 This is a schematic diagram of the welded nickel sheet structure;

[0028] The markings in the diagram are as follows: 1. Lower cover plate; 2. Battery cell pack; 3. Upper cover plate; 31. Connecting protrusion; 311. Connecting hole; 32. Mounting groove; 321. Positioning pin; 322. Welding hole; 4. Welding layer; 41. Welding nickel sheet; 411. Welding positioning hole; 412. Terminal; 413. Connecting end; 5. Heating module; 51. Support part; 511. Positioning hole; 52. Heating part. Detailed Implementation

[0029] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.

[0030] Implementation example:

[0031] like Figure 1 The diagram shows a novel heating structure for a lithium iron phosphate battery pack. The lower cover plate 1 and the upper cover plate 3 serve as the housing for the battery pack 2, clamping and wrapping the battery pack 2 and providing a solid support platform to ensure the stability of the internal battery cells and components. The welding layer 4 on the upper cover plate 3 connects individual battery cells in a series and parallel manner to form a battery pack. The heating module 5 covers the welding layer 4 to keep the battery pack within its optimal performance temperature range.

[0032] like Figure 2 The upper cover plate 3, facing the welding layer 4, has an array of mounting slots 32. Each mounting slot 32 has a welding hole 322 corresponding to a battery cell, and a protruding positioning pin 321. A connecting protrusion 31 is provided on the periphery of the mounting slot 32 facing the welding layer 4, passing through the welding layer 4 and abutting against the heating module 5. The mounting slot 32 in the welding layer 4 is composed of multiple welding nickel sheets 41, such as... Figure 4As shown, each welding nickel sheet 41 is provided with a through welding positioning hole 411 corresponding to the positioning pin 321, and the positioning pin 321 is sleeved into the welding positioning hole 411 to realize the positioning and installation of the welding nickel sheet 41 in the installation groove 32. By placing the welding nickel sheet 41 into the installation groove 32 and fixing it with the positioning pin 321, the mechanical stability of the welding nickel sheet 41 can be significantly enhanced, preventing it from shifting or loosening during use, avoiding poor electrical connection or increased contact resistance due to position deviation, and thus ensuring the efficiency and stability of current transmission. The welding nickel sheet 41 protrudes downward and is provided with a connection end 413, which penetrates the welding hole 322 and is connected with the battery cell. By using a clear physical connection method, the possibility of accidental contact between the welding nickel sheet 41 and other metal components is reduced, the risk of short circuit is reduced, external vibration and impact are effectively resisted, and the welding nickel sheet 41 is prevented from loosening or falling off, thereby maintaining long-term stable electrical connection. The welding nickel sheet 41 is provided with a bent wiring end 412 on the side, which penetrates into the installation groove 32 to the side of the upper cover plate 3 and is exposed, used for connection with external circuits. In the embodiment, the wiring end 412 is connected with the battery management system through a collection line to realize real-time monitoring of parameters such as battery cell voltage and temperature.

[0033] As shown in the heating module 5, Figure 3 The support part 51 as the frame is made of metal material, providing good mechanical strength. The support part 51 is provided with a positioning hole 511, and a bolt penetrates the positioning hole 511 and enters the internally threaded connection hole 311 on the welding layer 4, realizing stable installation and clamping the welding layer 4 at the same time, ensuring the stability of the entire structure. The heating part 52 in the frame of the support part 51 is covered with insulating material to wrap the heating wire and prevent current leakage, ensuring electrical safety. The heating part 52 provides electrical isolation while having good heat conduction performance, and heat can be efficiently transferred to the welding layer, reducing heat loss. The welding layer 4 is evenly distributed to each battery cell, ensuring that all battery cells can work under the same temperature conditions. The heating module 5 is positioned and connected on the upper cover plate 3, embodying the overall design of the battery pack, and all components are positioned and installed based on the upper cover plate 3. At the same time, the heating module 5 is in communication with the battery management system (BMS) and operates under the control of the BMS. The BMS dynamically adjusts the heating power according to the real-time monitored battery cell temperature, dynamically adjusts the heating power according to the actual demand, ensures that the battery is always within the optimal working temperature range, avoids overheating or overcooling, avoids ineffective heating, and reduces overall energy consumption.

[0034] The utility model discloses discarded the design of traditional scheme need to add epoxy board insulation, adopt heating module direct contact welding layer, greatly improved the heat transfer efficiency.Solved the low heating efficiency, long time and the problem such as occupying space of existing lithium iron phosphate PACK heating structure.It not only promoted the heating efficiency and uniformity, shortened the preheating time, strengthened the security, reliability and intelligent management level of system still.These advantages promote the overall performance and user experience promotion of lithium iron phosphate PACK together, provide strong support for the development of new energy technology.

[0035] It can be understood that the utility model is described through some embodiments, and the person skilled in the art knows that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the utility model. In addition, under the guidance of the utility model, these features and embodiments can be modified to adapt to specific conditions and materials without departing from the spirit and scope of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the scope protected by the utility model.

Claims

1. A novel lithium iron phosphate PACK battery heating structure, characterized in that, Includes a lower cover plate, a battery pack placed on the lower cover plate, an upper cover plate that clamps the battery pack with the lower cover plate, a welding layer disposed on the upper cover plate and connected to the battery pack, and a heating module covering the welding layer; The heating module includes a support part and a heating part. The support part, as a frame, is made of metal and connected to the welding layer. The heating part, which is set in the frame of the support part, uses insulating material to wrap the heating wire to transfer heat to the welding layer. The upper cover plate has a connecting protrusion on the side facing the welding layer. The connecting protrusion extends through the welding layer toward the heating module. The support part has a positioning hole corresponding to the connecting protrusion. The upper end face of the connecting protrusion has a connecting hole with an internal thread. The heating module is installed on the upper cover plate and the welding layer is clamped at the same time by passing a bolt through the positioning hole and entering the connecting hole.

2. The novel lithium iron phosphate PACK battery heating structure according to claim 1, characterized in that, The battery pack includes several battery cell groups, each battery cell group includes several battery cells, and the welding layer includes welding nickel sheets corresponding to the battery cell groups.

3. The novel lithium iron phosphate PACK battery heating structure according to claim 2, characterized in that, The upper cover plate is recessed and has several mounting grooves, through which the welding nickel sheet enters and connects to the battery cell assembly.

4. The novel lithium iron phosphate PACK battery heating structure according to claim 3, characterized in that, A positioning pin is provided in the mounting groove facing the welding nickel sheet, and a welding positioning hole is provided in the welding nickel sheet corresponding to the positioning pin. The welding positioning hole passes through the positioning pin to realize the installation of the welding nickel sheet in the mounting groove.

5. The novel lithium iron phosphate PACK battery heating structure according to claim 3, characterized in that, The mounting groove is provided with welding holes, which are corresponding to the battery cells to realize the connection between the welding nickel sheet and the battery cell assembly.

6. The novel lithium iron phosphate PACK battery heating structure according to claim 3, characterized in that, The connecting protrusion is located around the mounting groove.

7. The novel lithium iron phosphate PACK battery heating structure according to claim 3, characterized in that, The welding nickel sheet has a terminal bend on one side, which passes through the mounting groove and protrudes from the side of the upper cover plate for connection to external circuits.

8. The novel lithium iron phosphate PACK battery heating structure according to claim 7, characterized in that, The terminal is connected to the battery management system via a data acquisition line, and the real-time parameters of the battery cell are fed back to the battery management system.

9. The novel lithium iron phosphate PACK battery heating structure according to claim 8, characterized in that, The heating module is connected to the battery management system and operates under the control of the battery management system.

10. The novel lithium iron phosphate PACK battery heating structure according to claim 5, characterized in that, The welding nickel sheet is provided with a connecting end corresponding to the welding hole, and the connecting end passes through the welding hole and connects to the battery cell.

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