Lithium battery module with circuit board fixing structure

Abstract

The application relates to the technical field of lithium battery packs and discloses a lithium battery module with a circuit board fixing structure, which comprises a battery support, lithium ion batteries, connecting pieces, a circuit board, a backing plate and screws, the lithium ion batteries are arranged in the battery support at two ends, the connecting pieces are welded on the positive and negative electrode surfaces of the lithium ion batteries, the circuit board is clamped between the battery support and the backing plate, and the screws are fixed to the battery support by penetrating through the backing plate and the circuit board. The integrated embedded circuit board fixing structure can reliably fix the circuit board without increasing the overall size of the module, greatly improves the space utilization and structural integration, and significantly improves the safety and anti-vibration reliability of the lithium battery module through multiple insulation and stress buffering design.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, and more specifically to a lithium battery module with a circuit board fixing structure. Background Technology

[0002] Lithium-ion batteries, due to their high capacity, high energy density, good cycle stability, and portability, have gradually replaced nickel-metal hydride and nickel-cadmium batteries and are widely used in various fields such as electronic devices, mining machinery, mountaineering equipment, and power tools. Furthermore, lithium-ion batteries have also become energy storage devices for other unstable clean energy sources (such as solar, wind, and tidal energy). In recent years, lithium-ion batteries have been widely used in hybrid electric vehicles, electric vehicles, unmanned vehicles, and drones.

[0003] As the application scenarios of lithium-ion batteries gradually expand, the functions and structures of lithium battery packs are becoming increasingly complex. Due to insufficient understanding and attention to lithium battery packs, the space allocated for lithium battery modules at the initial system design stage is excessively tight, leading to reduced reliability and causing irreparable losses, such as the frequent fires of new energy vehicles, power bank fires, and lithium battery explosions. These incidents place higher, stricter, and more demanding requirements on lithium battery module structures, necessitating the development of a new lithium battery module structure to address this issue. Summary of the Invention

[0004] The present invention aims to provide a lithium battery module with a circuit board fixing structure to solve the technical problems of existing lithium battery modules, such as limited reserved space, the need for additional brackets for the circuit board leading to loose structure, poor insulation and low vibration resistance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a lithium battery module with a circuit board fixing structure, comprising a battery bracket, a lithium-ion battery, a connecting piece, a circuit board, a pad, and screws. The two ends of the lithium-ion battery are respectively installed in the battery bracket. The connecting piece is welded to the positive and negative electrode surfaces of the lithium-ion battery. The circuit board is disposed between the battery bracket and the pad. The screw passes through the pad and the circuit board in sequence and is screwed into the battery bracket. The total thickness of the circuit board and the pad is consistent with the height of the protruding block of the battery bracket.

[0006] Preferably, as an improvement, the two end faces of the lithium-ion battery are limited by the blocks of the battery bracket, so that the lithium-ion battery and the circuit board do not directly contact each other, and the blocks of the battery bracket also serve as insulating spacers between the lithium-ion battery and the circuit board.

[0007] Preferably, as an improvement, the head of the screw is completely recessed into the pad, and the battery bracket is provided with a wire thread sleeve or nut at the position where the screw is screwed in.

[0008] Preferably, as an improvement, the connecting piece is simultaneously welded to the positive and negative electrode surfaces of the lithium-ion battery and the corresponding pads on the circuit board, and the middle part of the connecting piece is designed to be arched or bent.

[0009] Preferably, as an improvement, a non-metallic pressure plate is provided above the protruding block of the battery bracket, and a through hole is opened at the corresponding position of the pad. The screw passes through the pressure plate, the pad, and the circuit board to fix it on the battery bracket. The pressure plate presses down on the protruding block of the battery bracket and the pad.

[0010] Preferably, as an improvement, the battery holder is made of a high-temperature resistant and flame-retardant non-metallic material, and the pad is made of a non-metallic material.

[0011] Preferably, as an improvement, the connecting piece is made of pure nickel, and the lithium-ion battery and the battery bracket are fixedly connected by adhesive dispensing.

[0012] Preferably, as an improvement, the circuit board is any one of a pressure plate, an overcurrent connection plate, or a protection plate.

[0013] The principle of this solution is as follows: the protruding block of the battery bracket itself serves as a support carrier for the circuit board. The circuit board is sandwiched between the battery bracket and the pad and directly fixed to the battery bracket body with screws, eliminating the need for an additional independent circuit board mounting bracket. At the same time, the block of the battery bracket simultaneously achieves axial positioning of the cylindrical lithium-ion battery and insulation isolation between the battery and the circuit board. The elastic deformation of the arched / bent connecting piece absorbs vibration and impact stress, ultimately achieving reliable fixing of the circuit board and safe and stable operation of the module within a very small space.

[0014] Advantages of this solution: 1. This invention adopts an embedded fixing structure in which the circuit board is sandwiched between the battery bracket and the pad. The protruding block of the battery bracket itself serves as the support for the circuit board. There is no need to set up an additional circuit board mounting bracket, which greatly reduces the overall size of the module and improves the space utilization rate by more than 30%. It effectively solves the design problem of tight reserved space in lithium battery pack modules.

[0015] 2. This invention achieves both axial positioning of the lithium-ion battery and insulation isolation between the battery and the circuit board through the stop of the battery bracket. It serves two purposes in one, simplifies the module structure, avoids the risk of short circuit caused by direct contact between the lithium-ion battery and the circuit board, and significantly improves the insulation performance and safety of the lithium battery module.

[0016] 3. The present invention designs the total thickness of the circuit board and the pad to be consistent with the height of the protruding block of the battery bracket, and makes the screw head completely sink into the pad, realizing a flat design with no protrusions on the module surface, further optimizing the space utilization, and improving the compactness and reliability of the module structure.

[0017] 4. The present invention designs the middle part of the connecting piece as an arch or a bend, so that the connecting piece has a certain elastic movement margin, which can effectively absorb the stress generated by vibration and impact, prevent the connecting piece from breaking due to fatigue, and greatly improve the vibration resistance and service life of the lithium battery module.

[0018] 5. The present invention has a simple structural principle, few parts, simple assembly process, and is easy to automate production, which reduces the design and manufacturing cost of lithium battery modules in a small space and has strong practical and promotional value. Attached Figure Description

[0019] Figure 1 This is a triaxial view of a lithium battery module with a circuit board fixing structure according to the present invention; Figure 2 This is a front view of a lithium battery module with a circuit board fixing structure according to the present invention; Figure 3 for Figure 2 The left view; Figure 4 for Figure 2 Top view; Figure 5 for Figure 2 AA section view; Figure 6 This is a magnified view of a portion of the battery holder.

[0020] The reference numerals in the accompanying drawings include: battery bracket 1, lithium-ion battery 2, connecting piece 3, circuit board 4, pad 5, screw 6, adhesive dispensing 7. Detailed Implementation

[0021] The following detailed description illustrates the specific implementation method: The basic implementation examples are as follows: Figure 1-6The diagram shows a lithium battery module with a circuit board fixing structure, comprising a battery bracket 1, a lithium-ion battery 2, a connecting piece 3, a circuit board 4, a pad 5, and screws 6. The lithium-ion battery 2 is a cylindrical lithium-ion battery, with its two ends respectively inserted into the upper and lower battery brackets 1. The lithium-ion battery 2 and the battery brackets 1 are fixedly connected by adhesive dispensing 7 to prevent axial movement and detachment of the lithium-ion battery 2 during use. The two end faces of the lithium-ion battery 2 are limited by blocks on the battery brackets 1, which are recessed into the circular holes of the battery brackets 1 to ensure that the lithium-ion battery 2 is firmly installed and accurately positioned. Simultaneously, the blocks on the battery brackets 1 also serve as insulating spacers between the lithium-ion battery 2 and the circuit board 4, preventing direct contact between the lithium-ion battery 2 and the circuit board 4, thus providing good insulation.

[0022] Circuit board 4 is placed on the protruding block of battery bracket 1, and pad 5 covers the circuit board 4. The total thickness of circuit board 4 and pad 5 is the same as the height of the protruding block of battery bracket 1. Screw 6 passes through pad 5 and circuit board 4 in sequence and is screwed into battery bracket 1, firmly fixing circuit board 4 and pad 5 to battery bracket 1. The head of screw 6 is completely recessed into pad 5 to prevent the screw head from protruding and affecting the overall size and appearance of the module. To improve the strength and durability of the threaded connection and prevent thread damage after repeated disassembly and assembly, wire thread inserts or nuts can be pre-embedded in battery bracket 1 at the screw insertion position.

[0023] The connecting piece 3 is made of pure nickel, which has good conductivity. It is first soldered to the positive and negative electrode surfaces of the lithium-ion battery 2, and then soldered to the corresponding pads on the circuit board 4 according to the circuit design requirements, thus realizing the electrical connection between the lithium-ion battery 2 and the circuit board 4. The middle part of the connecting piece 3 is designed to be arched or bent, so that the connecting piece 3 has a certain amount of elasticity and can effectively absorb the vibration and impact stress generated during the transportation and use of the lithium battery module, preventing the connecting piece from breaking due to fatigue.

[0024] The battery bracket 1 is made of high-temperature resistant and flame-retardant non-metallic material, and the pad 5 is also made of non-metallic material with good insulation properties, further improving the safety of the lithium battery module. The circuit board 4 can be designed as a pressure plate, overcurrent connection plate, or protection plate, etc., according to actual functional requirements. For applications requiring higher structural strength, a non-metallic pressure plate can be placed above the protruding block of the battery bracket 1, and through holes can be made at the corresponding positions of the pad 5, so that the screw 6 can pass through the pressure plate, the pad 5, and the circuit board 4 simultaneously to fix it to the battery bracket 1. The pressure plate can press down on the protruding block of the battery bracket 1 and the pad 5 at the same time, further enhancing the stability and deformation resistance of the overall module structure.

[0025] Taking a lithium battery module consisting of 2 parallel and 9 series lithium-ion batteries and an overcurrent connection circuit board as an example, the specific implementation process of this invention is as follows: First, apply adhesive 7 to the inner wall of the lithium-ion battery mounting holes of the upper and lower battery brackets. Then, install 18 lithium-ion batteries into the upper and lower battery brackets in a 2 parallel and 9 series configuration, ensuring that each lithium-ion battery is installed in place and its end face is tightly fitted to the stop block of the battery bracket. Next, place the overcurrent connection circuit board on the protruding block of the battery bracket, aligning the mounting holes. Then, cover the circuit board with a pad, ensuring that the mounting holes of the pad correspond one-to-one with the mounting holes of the circuit board and the battery bracket. Screws are then passed through the pad and the circuit board in sequence and tightened onto the battery bracket, so that the circuit board and the pad are firmly clamped between the battery bracket and the pad. Leave for a period of time to allow the adhesive between the battery bracket and the lithium-ion batteries to fully cure. After the adhesive cures, pure nickel connecting pieces are sequentially soldered onto the positive and negative electrode surfaces of the lithium-ion battery and the corresponding pads on the overcurrent connection circuit board. After soldering, insulating tape is covered on the surface of the connecting pieces to ensure insulation, thus forming a lithium battery module with a circuit board fixing structure.

[0026] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific 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 solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention 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 lithium battery module with a circuit board fixing structure, characterized in that: The device includes a battery holder, a lithium-ion battery, a connecting piece, a circuit board, a pad, and screws. The two ends of the lithium-ion battery are respectively installed in the battery holder. The connecting piece is welded to the positive and negative electrode surfaces of the lithium-ion battery. The circuit board is disposed between the battery holder and the pad. The screw passes through the pad and the circuit board in sequence and is screwed into the battery holder. The total thickness of the circuit board and the pad is the same as the height of the protrusion of the battery holder.

2. A lithium battery module with a circuit board fixing structure according to claim 1, characterized in that: The two end faces of the lithium-ion battery are limited by the blocks of the battery bracket, and the lithium-ion battery and the circuit board do not directly contact each other. The blocks of the battery bracket also serve as insulating spacers between the lithium-ion battery and the circuit board.

3. A lithium battery module with a circuit board fixing structure according to claim 2, characterized in that: The head of the screw is completely recessed into the pad, and the battery bracket is provided with a wire thread sleeve or nut at the position where the screw is screwed in.

4. A lithium battery module with a circuit board fixing structure according to claim 3, characterized in that: The connecting piece is simultaneously welded to the positive and negative electrode surfaces of the lithium-ion battery and the corresponding pads on the circuit board. The middle part of the connecting piece is designed to be arched or bent.

5. A lithium battery module with a circuit board fixing structure according to claim 4, characterized in that: A non-metallic pressure plate is provided above the protruding block of the battery bracket. A through hole is opened at the corresponding position of the pad. The screw passes through the pressure plate, the pad, and the circuit board to fix it on the battery bracket. The pressure plate presses down on the protruding block of the battery bracket and the pad.

6. A lithium battery module with a circuit board fixing structure according to claim 5, characterized in that: The battery holder is made of a high-temperature resistant and flame-retardant non-metallic material, and the pad is made of a non-metallic material.

7. A lithium battery module with a circuit board fixing structure according to claim 6, characterized in that: The connecting piece is made of pure nickel, and the lithium-ion battery and the battery bracket are fixedly connected by adhesive dispensing.

8. A lithium battery module with a circuit board fixing structure according to claim 7, characterized in that: The circuit board can be any one of a pressure plate, an overcurrent connection plate, or a protection plate.

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