Preparation method of high-capacity square battery pack

Abstract

The invention belongs to the technical field of batteries, and discloses a preparation method of a high-capacity square battery pack, which comprises the following steps: step 1, connecting a plurality of square single batteries in series to form a battery module, and electrically connecting parallel wires with plugs on series sheets of the single batteries of the battery module; 2, one or more square battery modules are installed in a fixing frame, heat conduction insulating sheets are tightly installed at the tops and the bottoms of battery module pole columns, and transition plates with sockets are installed between the battery modules; 3, fixing the plurality of battery modules by using a fixing frame, a fixing rod, an upper pressing strip, a lower pressing strip, an upper liquid cooling plate and a lower liquid cooling plate; and 4, connecting two or more battery modules in parallel through a parallel line to form a high-capacity battery pack, and connecting a current-limiting resistor on the parallel line in series. According to the invention, the battery module can be conveniently and quickly assembled into the high-capacity battery pack. The parallel assembly process is simple and easy to operate.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a method for preparing a large-capacity square battery pack. Background Art

[0002] Limited by lithium battery technology and processes, the current capacity of square single-cell lithium batteries does not exceed 1000Ah, and cylindrical batteries do not exceed 100Ah. In practical applications, multiple single-cell batteries need to be connected in series or in parallel to form a high-voltage, large-capacity battery pack. The technology for connecting multiple square single-cell batteries in series is very mature, but there is no good way to connect multiple battery modules in parallel after connecting them in series. Currently, multiple square battery modules are usually directly connected in parallel. When there is a voltage difference, internal resistance difference, and self-discharge difference between the battery modules, direct parallel connection will form a circulation between the battery modules, seriously affecting the performance of the battery pack and even causing safety accidents. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the present invention provides a method for preparing a large-capacity square battery pack, which solves the circulation problem existing when the existing square battery modules are connected in parallel, and the process difficulty of connecting single square batteries in parallel.

[0005] (II) Technical solution

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A method for preparing a large-capacity square battery pack comprises the following steps:

[0008] Step 1: connect a number of square single cells in series to form a battery module, and each square battery series connection piece in the battery module is electrically connected to a parallel line with a parallel plug;

[0009] Step 2: Install multiple battery modules in a fixing frame, tightly install heat-conducting insulating sheets at the top and bottom of the battery module poles, and install a transition plate with parallel sockets between the battery modules;

[0010] Step 3, fix the plurality of battery modules with a fixing frame, a fixing rod, an upper pressing bar, a lower pressing bar, an upper liquid cooling plate and a lower liquid cooling plate;

[0011] Step 4: Connect two or more battery modules in parallel through parallel lines to form a large-capacity battery pack.

[0012] Preferably, the battery module is installed in a fixing frame, and a plurality of the battery modules are fixed by a fixing frame, a fixing rod, an upper pressure bar, a lower pressure bar, an upper liquid cooling plate and a lower liquid cooling plate, and the parallel wires on two or more battery modules are connected to the parallel sockets to form the large-capacity battery pack.

[0013] Preferably, a heat-conducting insulating sheet is arranged between the upper end surface of the battery module and the upper liquid cooling plate, and between the lower end surface of the battery module and the lower liquid cooling plate.

[0014] Preferably, one end of the parallel line is electrically connected to the series connection piece, and the other end is electrically connected to a parallel plug, and the parallel socket is fixedly mounted on the transition plate.

[0015] Preferably, a current-limiting resistor is connected in series on the parallel line.

[0016] (III) Beneficial effects

[0017] The present invention has the following beneficial effects:

[0018] The preparation method of the large-capacity battery pack is to connect multiple square batteries in series to form a battery module, pre-install a parallel line with a parallel plug on each single battery of the battery module, and connect two or more battery modules in parallel through the parallel line to form a large-capacity battery pack, which has a simple design, easy operation and high production efficiency. A heat-conducting insulating sheet and an upper liquid cooling plate are installed on the top of the battery pole to improve the heat dissipation efficiency of the battery and reduce the temperature difference in the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the disassembled structure of a large-capacity square battery pack of the present invention;

[0020] Figure 2 This is a schematic diagram of parallel connection between square battery modules of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the large-capacity square battery pack of the present invention in an assembled state;

[0022] Figure 4 It is a schematic diagram of the structure of a square battery module with a transition plate of the present invention.

[0023] In the figure: 1. fixing frame; 2. lower pressure strip; 3. fixing rod; 4. lower liquid cooling plate; 5. battery module; 6. series connection plate; 7. thermal insulation plate; 8. upper liquid cooling plate; 9. upper pressure strip; 10. transition plate; 11. parallel plug; 12. parallel socket. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1 The present invention provides a technical solution: a method for preparing a large-capacity square battery pack, comprising the following steps:

[0026] Step 1: connect a number of square single cells in series to form a battery module 5, and each single cell series connection piece of the battery module 5 is electrically connected to a parallel line with a parallel plug 11, and a current-limiting resistor is connected in series to the parallel line;

[0027] Step 2: Install multiple battery modules 5 in the fixing frame 1, tightly install heat-conducting insulating sheets 7 at the top and bottom of the poles of the battery modules 5, and install transition plates 10 with parallel sockets 12 between the battery modules 5;

[0028] Step 3, fix the plurality of battery modules 5 with the fixing frame 1, the fixing rod 3, the upper pressing bar 9, the lower pressing bar 2, the upper liquid cooling plate 8 and the lower liquid cooling plate 4;

[0029] Step 4: After the battery module 5 is installed and fixed, two or more battery modules 5 are connected in parallel through the parallel plug 11 of the parallel line and the parallel socket 12 on the transition plate 10 to form a large-capacity battery pack.

[0030] The present invention forms a battery module 5 by first connecting a plurality of square single cells in series, and then connecting the corresponding batteries between two adjacent battery modules 5 in parallel through a parallel line with a plug and a parallel socket 12 to form a large-capacity square battery pack. The number of parallel battery modules 5 can be increased as needed, and the parallel operation is simple and the production efficiency is high. A heat-conducting insulating sheet and an upper liquid cooling plate are installed on the top of the battery pole to improve the heat dissipation efficiency of the battery and reduce the temperature difference in the battery.

[0031] Reference Figure 1 and 3 As shown, in this embodiment, the battery module 5 is placed in the fixing frame 1, and the fixing frame 1, the fixing rod 3, the upper pressure bar 9, the lower pressure bar 2, the upper liquid cooling plate 8 and the lower liquid cooling plate 4 are used to fix the plurality of battery modules 5 to prevent the battery pack from loosening, and at the same time ensure that the battery pole and the bottom are in close contact with the upper liquid cooling plate 8 and the lower liquid cooling plate 4 respectively, so as to form a good heat conduction. A parallel line with a plug is electrically connected to each series connection sheet 6, and the parallel plugs 11 at the corresponding positions of the two adjacent battery modules 5 are simultaneously inserted into the parallel sockets 12 installed at the corresponding positions on the transition plate 10, so that the two battery modules are connected in parallel to form a large-capacity battery pack.

[0032] Reference Figure 1 As shown, in this embodiment, the battery modules 5 are connected in series by series connection sheets 6, and heat conductive insulating sheets 7 are arranged between the upper end surface of the battery module 5 and the upper liquid cooling plate 8, and between the lower end surface and the lower liquid cooling plate 4. The heat conductive insulating sheets 7 are used to achieve heat transfer from the battery pole to the upper liquid cooling plate, thereby improving the heat dissipation rate of the battery module 5 and reducing the temperature difference in the battery.

[0033] Reference Figure 2 As shown, in this embodiment, a pluggable parallel line with a parallel plug 11 is electrically connected to the series piece of the battery module 5, and the single cells corresponding to two adjacent battery modules 5 are connected in parallel through the parallel plug 11 and the parallel socket 12, so that multiple battery modules 5 can be connected in parallel simply and quickly to form a large-capacity battery pack.

[0034] In this embodiment, the parallel wires are electrically connected to the series connection pieces on the battery module 5 by screw fixing or welding.

[0035] In this embodiment, current limiting protection when batteries are connected in parallel is achieved by connecting a current limiting fuse in series in the parallel line.

[0036] In this embodiment, a transition plate 10 is provided between two battery modules 5 , and the parallel socket 12 is fixedly mounted on the transition plate 10 .

[0037] Reference Figure 4 As shown, the parallel socket can be installed on one side of the transition plate 10, or it can be embedded in the transition plate 10, with the sockets separated on both sides of the transition plate; the transition plate 10 can increase the electrical strength of the battery module 5, and can also ensure the stability of the installation of the parallel socket 12 and the convenience of production.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a large-capacity square battery pack, characterized in that: The steps include: Step 1: connect a number of square single cells in series to form a battery module, and each square battery series connection piece in the battery module is electrically connected to a parallel line with a parallel plug; Step 2: Install multiple battery modules in a fixing frame, tightly install heat-conducting insulating sheets at the top and bottom of the battery module poles, and install a transition plate with parallel sockets between the battery modules; Step 3, fix the plurality of battery modules with a fixing frame, a fixing rod, an upper pressing bar, a lower pressing bar, an upper liquid cooling plate and a lower liquid cooling plate; Step 4: Connect two or more battery modules in parallel through parallel lines to form a large-capacity battery pack.

2. The method for preparing a large-capacity square battery pack according to claim 1, characterized in that: The battery module is installed in a fixing frame, and the fixing frame fixes the battery module through a fixing rod, an upper pressure bar, a lower pressure bar, a heat-conducting insulating sheet, an upper liquid cooling plate and a lower liquid cooling plate. The parallel wires on two or more battery modules are connected to the parallel sockets to form the large-capacity battery pack.

3. The method for preparing a large-capacity square battery pack according to claim 2, characterized in that: A heat-conducting insulating sheet is arranged between the upper end surface of the battery module and the upper liquid cooling plate, and between the lower end surface of the battery module and the lower liquid cooling plate.

4. The method for preparing a large-capacity square battery pack according to claim 3, characterized in that: One end of the parallel line is electrically connected to the series connection piece, and the other end is electrically connected to the parallel plug. The parallel socket is fixedly mounted on the transition plate.

5. A method for preparing a large-capacity square battery pack according to claim 4 or 5, characterized in that: The parallel line is connected in series with a current limiting resistor.

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