Modularized square cylindrical battery module

Abstract

The utility model discloses a modularized square cylindrical battery module. The modularized square cylindrical battery module comprises three single batteries, an anode connecting bar and a cathode connecting bar, wherein two small end surfaces of the single battery are respectively provided with a positive pole and a negative pole; three clamping grooves are formed in the first mounting surface of the positive electrode connecting bar; the positive electrode columns are clamped in the clamping grooves and are fixed by laser welding; the anode connecting row is provided with three through holes, the cathode column heads of the cathode columns penetrate through the through holes and are fixed through laser welding, the three anode columns are connected through the anode connecting row, and the three cathode columns are connected through the cathode connecting row, so that the three single batteries are arranged in parallel. By adopting the structure, the battery module formed by connecting the three single batteries in parallel is firm in internal connection and compact in layout, the battery module serving as a modularized power supply is combined into various battery packs through an external busbar, and the development cycle of a terminal product can be effectively shortened due to the characteristic that the battery module can be used at any time when being taken.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and in particular to a modular square cylindrical battery module. Background Art

[0002] In the prior art, for a power battery system used as an electrical device, it must have the characteristics of large capacity and high voltage. It is often necessary to combine multiple single cells in series and parallel to form a battery module, and then place it in the battery pack box. However, in the prior art, for the development of battery pack terminal products, it is first necessary to connect the single cells by wiring or welding, which has low installation efficiency and cumbersome steps, and limits the battery pack terminal product development cycle. Therefore, the utility model aims to provide a modular square cylindrical battery module with firm internal connection and compact layout, which can be used at any time to reduce the terminal product development cycle. Utility Model Content

[0003] In order to overcome the technical problems described in the prior art, the purpose of the present utility model is to provide a modular battery module.

[0004] The utility model discloses a modular battery module, comprising:

[0005] Three single cells, each of which has a positive electrode column and a negative electrode column at two small end faces;

[0006] A positive electrode connection bar, wherein the first mounting surface of the positive electrode connection bar is provided with three clamping grooves, and the positive electrode column is clamped in the clamping grooves and fixed by laser welding;

[0007] A negative electrode connection bar, wherein the negative electrode connection bar is provided with three through holes, and the negative electrode column heads of the negative electrode columns pass through the through holes and are fixed by laser welding;

[0008] The three positive poles are connected via the positive pole connecting bar, and the three negative poles are connected via the negative pole connecting bar, so that the three single cells are arranged in parallel.

[0009] As a preferred technical solution, a plurality of first mounting holes are provided between any two adjacent clamping grooves of the positive electrode connection row, and the first mounting holes are used for fastening connection with the positive electrode bus bar.

[0010] As a preferred technical solution, a plurality of second mounting holes are provided between any two adjacent through holes of the negative electrode connection row, and the second mounting holes are used for fastening connection with the negative electrode bus bar.

[0011] As a preferred technical solution, both the first mounting hole and the second mounting hole are threaded holes.

[0012] As a preferred technical solution, the second mounting surface of the positive electrode connecting bar is provided with three welding grooves, which correspond to the bottom of the clamping grooves. Laser welding is performed in the welding grooves to achieve fixed connection between the three single cells and the positive electrode connecting bar.

[0013] As a preferred technical solution, the outer edge of any negative electrode column through hole is a negative electrode welding portion, and laser welding is performed at the joint between the negative electrode column and the negative electrode welding portion to achieve fixed connection between the three single cells and the negative electrode connecting row.

[0014] As a preferred technical solution, the thickness of the opening area of ​​the negative electrode connection bar is smaller than the thickness of the non-opening area.

[0015] As a preferred technical solution, the positive electrode connecting bar and the negative electrode connecting bar are made of copper sheets, aluminum sheets or nickel sheets.

[0016] In summary, the utility model has the following technical effects:

[0017] The utility model discloses a modular square cylindrical battery module, including three single cells, a positive electrode connection row and a negative electrode connection row. The two small end faces of the single cell are respectively provided with a positive column and a negative column; the first mounting surface of the positive electrode connection row is provided with three snap-in grooves, the positive column is snap-into the snap-in grooves and fixed by laser welding; the negative electrode connection row is provided with three through holes, the negative electrode column heads of the negative electrode columns pass through the through holes and are fixed by laser welding, the three positive columns are connected by the positive electrode connection row, and the three negative columns are connected by the negative electrode connection row, so as to realize that the three single cells are arranged in parallel. The battery module with three single cells in parallel using the above structure has a firm internal connection and a compact layout. The battery module is used as a modular power source through an external bus bar to combine into a variety of battery packs. Its feature of being ready for use can effectively reduce the terminal product development cycle. Therefore, compared with the existing battery pack technology, the modular square cylindrical battery module provided by the utility model has obvious technical advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a schematic diagram of a three-dimensional structure of a modular battery module provided by some embodiments;

[0020] Figure 2is a schematic diagram of an exploded structure of a modular battery module provided by some embodiments;

[0021] Figure 3 is a schematic diagram of an exploded structure of a modular battery module provided in some embodiments from another angle;

[0022] The meanings of the reference numerals are as follows:

[0023] Single battery, 11-positive pole head, 111-positive pole substrate, 12-negative pole head, 121-negative pole substrate; positive pole connection row, 21-clamping groove, 22-first mounting hole, 23-welding groove; negative pole connection row, 31-through hole, 311-negative pole welding part, 32-second mounting hole. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in this embodiment to clearly and completely describe the technical solution in this embodiment. The embodiment described in this article is only for illustrative purposes, and is not intended to limit the scope of protection of the utility model. Therefore, it should be understood that various modifications and changes can be made to this embodiment without departing from the scope of protection of the utility model.

[0025] In the description of the present invention, unless otherwise clearly specified and limited, the term "and / or" includes any and all combinations of one or more associated listed items. Unless otherwise specified or explained, the terms "connection", "fixed" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Further, in the description of the present utility model, it should be understood that the directional words described in the present embodiment are described at the angles shown in the accompanying drawings and should not be understood as limiting the present embodiment. It should also be understood that in the context, when it is mentioned that an element or feature is connected to another element (one or more), it can not only be directly connected to the other (one or more) elements, but also indirectly connected to the other (one or more) elements through an intermediate element.

[0027] Before introducing the technical solution of the utility model, it is necessary to explain the creation background of the utility model. It is common that in the prior art, for the power battery system used as an electrical device, it must have the characteristics of large capacity and high voltage. It is often necessary to combine multiple single cells in series and parallel to form a battery module, and then place it in the battery pack box. However, in the prior art, for the development of battery pack terminal products, it is first necessary to connect the single cells by wiring or welding to form a battery pack, and then combine them to form the required battery pack. The installation efficiency is low and the steps are cumbersome, which limits the development cycle of the battery pack terminal product. Therefore, the utility model aims to provide a modular square cylindrical battery module with firm internal connection and compact layout, which can be used as needed to reduce the terminal product development cycle.

[0028] In view of this, please refer to Figures 1 to 3 The exemplary embodiment of the utility model provides a modular square cylindrical battery module, including three single cells 1, a positive electrode connection row 2 and a negative electrode connection row 3. Among them, the two small end faces of the single cell 1 are respectively provided with a positive electrode column and a negative electrode column; the first mounting surface of the positive electrode connection row 2 is provided with three snap-in grooves 21, and the positive electrode columns of the three single cells 1 are sequentially snapped into the three snap-in grooves 21 and fixed by laser welding; the negative electrode connection row 3 is provided with three negative electrode column through holes 31, and the negative electrode column heads 12 of the negative electrode columns of the three single cells 1 pass through the three through holes 31 in turn and are fixed by laser welding. In this way, the three positive electrode columns are connected through the positive electrode connection row 2, and the three negative electrode columns are connected through the negative electrode connection row 3, so that the three single cells 1 are arranged in parallel.

[0029] The battery module with three single cells 1 connected in parallel adopts the above structure, and its internal connection is firm and compact. The battery module is used as a modular power source through an external busbar to be combined into a variety of battery packs. Its feature of being ready to use can effectively reduce the terminal product development cycle. Therefore, compared with the existing battery pack technology, the modular square cylindrical battery module provided by the utility model has obvious technical advantages.

[0030] In some embodiments, see Figure 2 and Figure 3 A plurality of first mounting holes 22 are provided between any two adjacent snap-in slots 21 of the positive electrode connection bar 2. The first mounting holes 22 are used to be fastened to the positive electrode bus bar. The design of the first mounting holes 22 enables the modular battery module to be connected to the positive electrode bus bar (not shown in the figure) through fasteners, which is conducive to the subsequent positive electrode bus bar being able to integrate one or more modular battery modules for series or parallel arrangement. Of course, please refer to Figure 2 and Figure 3, a plurality of second mounting holes 32 are provided between any two adjacent through holes 31 of the negative electrode connection row 3, and the second mounting holes 32 are used to be fastened to the negative electrode bus (not shown in the figure). The design of this second mounting hole 32 is similar to the above-mentioned first mounting hole 22, and will not be repeated here. It should be noted that the utility model does not specifically limit the number of the first mounting holes 22 and the second mounting holes 32. Preferably, the first mounting hole 22 and the second mounting hole 32 are both threaded holes, so that the first mounting hole 22 and the second mounting hole 32 are electrically fixed to the positive electrode bus and the negative electrode bus, respectively, in cooperation with the fastening bolts.

[0031] See also Figure 2 and Figure 3 The positive pole of the single battery 1 includes a positive pole head 11 and a positive pole substrate 111. The positive pole head 11 protrudes from the positive pole substrate 111. In order to make the clamping groove 21 fully fit the positive pole, the cross section of the clamping groove 21 is stepped. For further information, please refer to Figure 2 The second mounting surface of the positive electrode connection bar 2 is provided with three welding grooves 23, and the welding grooves 23 correspond to the bottom of the clamping grooves 21. Laser welding is performed at the welding grooves 23 to achieve fixed connection between the three single cells 1 and the positive electrode connection bar 2. Specifically, when the positive electrode column head 11 of the positive electrode of the single cell 1 is clamped and fitted with the clamping grooves 21, the welding grooves 23 of the second mounting surface serve as positive electrode welding parts, and laser welding is performed at the welding grooves 23 to achieve fixed connection between the positive electrode connection bar 2 and each single cell 1.

[0032] In some embodiments, see Figure 2 and Figure 3 The outer edge of any of the negative electrode column through holes 31 is a negative electrode welding portion 311, and laser welding is performed at the joint between the negative electrode column and the negative electrode welding portion 311 to achieve fixed connection between the three single cells 1 and the negative electrode connection row 3. For details, please refer to Figure 1 The negative electrode column of the single battery 1 includes a negative electrode column head 12 and a negative electrode substrate 121, and the negative electrode column head 12 protrudes from the negative electrode substrate 121. After the negative electrode column head 12 of the negative electrode of the single battery 1 passes through the through hole 31 of the negative electrode connecting bar 3, the negative electrode substrate 121 is attached to the negative electrode welding part 311, and laser welding is performed on the negative electrode welding part 311 to achieve fixed connection between the negative electrode connecting bar 3 and each single battery 1.

[0033] In some embodiments, see Figure 2 and Figure 3 The thickness of the opening area of ​​the negative electrode connection bar 3 is less than the thickness of the non-opening area. Such a design is adopted to prevent the negative electrode column head 12 from being blocked by the negative electrode connection bar 3 too much.

[0034] In addition, the positive electrode connecting bar 2 and the negative electrode connecting bar 3 are made of copper, aluminum or nickel sheets. It can be understood that the copper, aluminum or nickel sheets are used to make the connecting bars have good electrical conductivity, thermal conductivity, corrosion resistance and other current requirements.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A modular square cylindrical battery module, characterized in that: include: Three single cells, each of which has a positive electrode column and a negative electrode column at two small end faces; A positive electrode connection bar, wherein the first mounting surface of the positive electrode connection bar is provided with three clamping grooves, and the positive electrode column is clamped in the clamping grooves and fixed by laser welding; A negative electrode connection bar, wherein the negative electrode connection bar is provided with three through holes, and the negative electrode column heads of the negative electrode columns pass through the through holes and are fixed by laser welding; The three positive poles are connected via the positive pole connecting bar, and the three negative poles are connected via the negative pole connecting bar, so that the three single cells are arranged in parallel.

2. The battery module according to claim 1, characterized in that: A plurality of first mounting holes are provided between any two adjacent clamping grooves of the positive electrode connection row, and the first mounting holes are used for fastening connection with the positive electrode bus bar.

3. The battery module according to claim 2, characterized in that: A plurality of second mounting holes are provided between any two adjacent through holes of the negative electrode connection row, and the second mounting holes are used for fastening connection with the negative electrode bus bar.

4. The battery module according to claim 3, characterized in that: The first mounting hole and the second mounting hole are both threaded holes.

5. The battery module according to claim 1, characterized in that: The second mounting surface of the positive electrode connection bar is provided with three welding grooves, and the welding grooves correspond to the bottoms of the clamping grooves. Laser welding is performed in the welding grooves to achieve fixed connection between the three single cells and the positive electrode connection bar.

6. The battery module according to claim 1, characterized in that: The outer edge of any of the negative electrode column through holes is a negative electrode welding portion, and laser welding is performed at the joint between the negative electrode column and the negative electrode welding portion to achieve fixed connection between the three single cells and the negative electrode connecting row.

7. The battery module according to claim 6, characterized in that: The thickness of the opening area of ​​the negative electrode connection bar is smaller than the thickness of the non-opening area.

8. The battery module according to claim 1, characterized in that: The positive electrode connecting bar and the negative electrode connecting bar are made of copper sheets, aluminum sheets or nickel sheets.

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