Enhanced heat dissipation type lithium ion battery system

Abstract

The utility model relates to an enhanced heat dissipation type lithium ion battery system in the technical field of lithium batteries, which comprises a battery cell module, a bracket, a shell assembly, a connecting bar, an insulating plate and a protective plate, and the battery cell module is formed by assembling eight lithium ion battery cell monomers according to an arrangement mode that two groups of lithium ion battery cell monomers are connected in parallel and four lithium ion battery cell monomers are connected in series; the connecting bar is used as a conductor for series-parallel electrical connection between the lithium ion battery cell monomers; the shell assembly comprises a battery jar and a battery cover covering the top of the battery jar, the battery cell module is supported and placed in the battery jar through the bracket, and the periphery of the battery cell module is filled with an epoxy heat-conducting structural adhesive; the insulating plate is arranged above the battery cell module, the protective plate is arranged between the insulating plate and the battery cover, a battery positive electrode and a battery negative electrode are mounted on the battery cover, and the battery positive electrode and the battery negative electrode are electrically connected with the battery cell module through the protective plate. The battery system is more reasonable in production process, simpler in wiring design and more convenient to install and operate, and the heat dissipation performance and the safety performance are obviously improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium batteries, in particular to an enhanced heat dissipation type lithium ion battery system. Background Art

[0002] A battery is a mobile energy storage device capable of repeated charge and discharge. There are many different types of batteries, including lead-acid, lithium-ion, and sodium-ion batteries. Traditional lead-acid batteries suffer from low specific energy, bulk, and weight, making them difficult to meet continuous high-rate charge and discharge requirements and maintaining a long cycle life. This limits their application scope. Consequently, lithium-ion and sodium-ion batteries have emerged to address some of the shortcomings of lead-acid batteries. For example, lithium-ion batteries use lithium iron phosphate cells with higher energy density, resulting in a volume that is only two-thirds the volume and weight of lead-acid batteries of the same capacity. However, similar lithium-ion battery packs currently face several pressing technical challenges: 1. The internal wiring harness is complex during battery installation, making installation inconvenient; 2. The battery system suffers from poor heat dissipation and low safety performance. Therefore, continued research and development and improvement of lithium-ion battery systems are necessary. Utility Model Content

[0003] In response to the above situation, the present invention provides an enhanced heat dissipation lithium-ion battery system, which has a more reasonable production process, a simpler wiring design, and more convenient installation and operation. At the same time, the heat dissipation performance and safety performance of the battery are also significantly improved.

[0004] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0005] A heat-enhanced lithium-ion battery system comprises a cell module, a bracket, a shell assembly, a connecting bar, an insulating plate and a protective plate. The cell module is formed by connecting a plurality of lithium-ion cell monomers in series and parallel, and the connecting bar serves as a conductor for electrically connecting the lithium-ion cell monomers in series and parallel. The shell assembly comprises a battery trough and a battery cover provided on the top of the battery trough. The cell module is supported and placed in the battery trough by the bracket. The insulating plate is provided above the cell module, and the protective plate is provided between the insulating plate and the battery cover. The battery cover is provided with a positive electrode and a negative electrode of the battery, and the positive and negative electrodes of the battery are electrically connected to the cell module via the protective plate.

[0006] Preferably, the battery cell module is composed of two battery cell groups connected in parallel, and each battery cell group is composed of four lithium-ion battery cell monomers aligned in parallel and connected in series.

[0007] Preferably, each lithium-ion battery cell is a square shell battery cell, and each square shell battery cell has a positive electrode column and a negative electrode column on its top cover. The positive and negative electrode columns of each square shell battery cell are connected in a corresponding series-parallel order using a connecting bar.

[0008] Preferably, the battery positive electrode and the battery negative electrode are both pluggable snap-on copper terminals, and the two terminals are matched with plastic or rubber protective covers.

[0009] Preferably, the connecting bar is made of 2.0 mm thick aluminum bar, and is positioned and welded to the positive and negative poles of each shell battery cell using laser welding equipment.

[0010] Preferably, the battery container and the battery cover are both made of plastic; the battery container is an integrally cast square box-shaped structure with an open top, and the battery cover is sealed and snapped onto the top of the battery container.

[0011] Preferably, the battery cell module is placed in the battery container, and the outer periphery of the battery cell module is glued and fixed to the inner wall of the battery container by structural adhesive.

[0012] Preferably, the bracket is a plastic structure bracket, and two brackets are provided. The two ends of the battery cell module are each supported by a bracket and abutted against the inner wall of the battery container.

[0013] Preferably, the insulating plate is a rectangular epoxy plate, and the two opposite sides of the epoxy plate are clamped between the two brackets. The epoxy plate plays the role of insulating isolation between the protective plate and the battery cell module. At the same time, the epoxy plate also serves as the mounting base of the protective plate. The protective plate is adhered to the epoxy plate by structural adhesive.

[0014] Preferably, the structural adhesive is epoxy thermal conductive structural adhesive, which has excellent thermal conductivity, high bonding strength and good high temperature resistance.

[0015] The present invention also includes other components that enable it to be used normally, which are all conventional means in the field. In addition, devices or components not limited in the present invention, such as: square shell battery cells, aluminum busbars, plastic structural brackets, epoxy thermal conductive structural adhesive, epoxy boards, protective plates and snap-on copper terminals, etc., all adopt existing technologies in the field.

[0016] The beneficial effects of the utility model are as follows:

[0017] The utility model provides an enhanced heat dissipation lithium-ion battery system. When welding battery cells, a connection bar with terminal posts is redesigned to replace the wiring harness, making the installation and wiring operations simpler and more convenient. At the same time, the packaging method of internally perfused epoxy thermal conductive structural adhesive is adopted, which not only improves the heat dissipation performance of the battery, but also ensures its buffering and shockproof performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of the enhanced heat dissipation lithium-ion battery system in the embodiment.

[0019] In the figure: 1. Battery tray; 2. Lithium-ion battery cell; 3. Bracket; 4. Insulation plate; 5. Battery cover; 6. Protection plate; 7. Battery cell module; 8. Connector bar. DETAILED DESCRIPTION

[0020] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments.

[0021] It should be noted that the terms "upper", "lower", "front", "back", "inside", "outside" and so on indicating directions or positional relationships are based on the drawings and are only for the convenience of description.

[0022] Example

[0023] like Figure 1 As shown, an enhanced heat dissipation lithium-ion battery system includes a battery module 7, a bracket 3, a shell assembly, a connecting bar 8, an insulating plate 4 and a protective plate 6. The battery module is composed of a plurality of lithium-ion battery cells connected in series and parallel, and the connecting bar is used as a conductor for series and parallel electrical connection between the lithium-ion battery cells 2; the shell assembly includes a battery slot 1 and a battery cover 5 covering the top of the battery slot, and the battery module is supported and placed in the battery slot by the bracket; the insulating plate is arranged above the battery module, and the protective plate is arranged between the insulating plate and the battery cover. The battery positive and negative electrodes are installed on the battery cover, and the positive and negative electrodes of the battery are electrically connected to the battery module through the protective plate.

[0024] The battery cell module is composed of two battery cell groups connected in parallel with each other, and each battery cell group is composed of four lithium-ion battery cell monomers aligned in parallel and connected in series.

[0025] Each lithium-ion battery cell is a prismatic cell, and each cell has a positive and negative electrode post on its top cover. The positive and negative electrode posts of each cell are connected in series and parallel order using connecting bars. Two cell groups connected in parallel each lead out to a positive and negative electrode connecting bar, respectively. The positive and negative electrodes of the battery are each electrically connected to the positive and negative electrode connecting bars via the control circuit of the protective board.

[0026] The square shell battery cell is a square aluminum shell lithium battery, which adopts the existing technology in this field, such as a new square aluminum shell lithium battery disclosed in the patent document with publication number CN115332609A.

[0027] The battery positive electrode and the battery negative electrode are both pluggable snap-on 200A copper terminals, and the two terminals are equipped with insulating plastic protective covers, which can well ensure the battery discharge overcurrent performance and mechanical installation performance.

[0028] The connecting bars are made of 2.0mm thick aluminum and are laser welded to the positive and negative terminals of each square cell. 9AWG standard silicone copper wire (output and collection wires) is used to connect the positive and negative connecting bars to the protection board, and between the protection board and the positive and negative terminals of the battery, ensuring efficient current flow.

[0029] The battery container and battery cover are both made of plastic. The battery container is an integrally cast square box-shaped structure with an open top, and the battery cover is sealed and snapped onto the top of the battery container.

[0030] The cell module is placed in the battery compartment, and the outer perimeter of the cell module, connection plate, and protective plate are glued to the inner wall of the battery compartment using 2mm thick structural adhesive. This provides excellent positional fixation and cushioning, while also accelerating heat conduction and diffusion, enhancing the heat dissipation performance of the cell module and protective plate.

[0031] The bracket is a plastic structure bracket, and two brackets are provided. The two ends of the battery cell module are respectively supported by a bracket and abutted against the inner wall of the battery slot.

[0032] The insulating plate is a rectangular epoxy plate, and the two opposite sides of the epoxy plate are clamped between the two brackets. The epoxy plate plays the role of insulation isolation between the protective plate and the battery module. At the same time, the epoxy plate also serves as the mounting base of the protective plate. The protective plate is adhered to the epoxy plate with structural adhesive, and then the epoxy plate is adhered to the side of the battery module close to the positive and negative poles of the battery.

[0033] The protection board adopts an intelligent balancing protection board with overvoltage protection, low voltage protection, and overcurrent protection, which can effectively ensure the consistency and safety of the battery during the charging and discharging process. The protection board adopts existing technology and will not be described in detail here.

[0034] The structural adhesive used is epoxy thermal conductive structural adhesive, which has excellent thermal conductivity, high bonding strength, and good high temperature resistance. Epoxy thermal conductive structural adhesive is a structural adhesive product that can be directly purchased on the market and belongs to the existing technology, so it will not be described in detail here.

[0035] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. Without departing from the scope and spirit of the described embodiments, many modifications and changes are obvious to ordinary technicians in this technical field. Any technical deformation made within the spirit and principles of the present invention falls within the scope of protection of the present invention.

Claims

1. An enhanced heat dissipation lithium-ion battery system, comprising a cell module, a bracket, and a housing assembly, characterized in that: The battery module is formed by connecting a plurality of lithium-ion battery cells in series and parallel, and the connecting row is used as a conductor for electrically connecting the lithium-ion battery cells in series and parallel; the shell assembly includes a battery slot and a battery cover provided on the top of the battery slot, and the battery module is supported and placed in the battery slot by the bracket; the insulating plate is provided above the battery cell module, and the protective plate is provided between the insulating plate and the battery cover, and the battery cover is provided with a positive electrode and a negative electrode of the battery, and the positive and negative electrodes of the battery are electrically connected to the battery module through the protective plate; the battery cell module is placed in the battery slot, and the outer periphery of the battery cell module is glued and fixed to the inner side wall of the battery slot by structural adhesive; the insulating plate is an epoxy plate, and the two opposite sides of the epoxy plate are fitted between the two brackets, and the protective plate is adhered to the epoxy plate by structural adhesive; the structural adhesive is epoxy thermal conductive structural adhesive.

2. The enhanced heat dissipation lithium-ion battery system according to claim 1, characterized in that: The battery cell module is composed of two battery cell groups connected in parallel with each other, and each battery cell group is composed of four lithium-ion battery cell monomers aligned in parallel and connected in series.

3. The enhanced heat dissipation lithium-ion battery system according to claim 2, characterized in that: Each of the lithium-ion battery cells is a square shell battery cell, and a positive electrode column and a negative electrode column are provided on the top cover of each of the square shell battery cells.

4. The enhanced heat dissipation lithium-ion battery system according to claim 1, characterized in that: The battery positive electrode and the battery negative electrode are both snap-on copper connection terminals, and protective covers are provided on the two connection terminals.

5. The enhanced heat dissipation lithium-ion battery system according to claim 4, characterized in that: The connecting bar is an aluminum bar with a thickness of 2 mm.

6. The enhanced heat dissipation lithium-ion battery system according to claim 1, characterized in that: The battery container and the battery cover are both made of plastic. The battery container is an integrally cast square box-shaped structure with an open top, and the battery cover is sealed and snapped onto the top of the battery container.

7. The enhanced heat dissipation lithium-ion battery system according to claim 6, characterized in that: The bracket is a plastic structure bracket, and two brackets are provided. The two ends of the battery cell module are respectively supported by a bracket and abutted against the inner wall of the battery slot.

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