Square battery cell connecting bar sheet

Abstract

The utility model relates to the technical field of battery cell testing assemblies, in particular to a square battery cell connecting bar sheet. The sheet comprises a sheet main body, the sheet main body is formed by combining at least two layers of thin sheets, each thin sheet is sequentially provided with a first welding section, a buffer section and a second welding section in the length direction of the thin sheets, and the first welding sections and the second welding sections of the adjacent thin sheets are mutually fixed. According to the utility model, the interaction force between the chip and a current line or a binding post in the chip installation process can be effectively reduced, and good contact between the chip and the current line or the binding post is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core testing components, in particular to a square battery core connecting bar. Background Art

[0002] With the development of the times, modern cars are gradually developing from engines to new energy. At this stage, the more mature technology of new energy is to use new energy batteries to drive motors. The connection between battery modules usually requires the use of hard aluminum bars with good conductivity for connection.

[0003] As described in the Chinese patent publication number CN217691041U, titled "A Hard Aluminum Bar for Connecting New Energy Battery Module Cells", the hard aluminum bar is roughly a long strip structure with mounting grooves at both ends of its top surface for connecting to the cell poles of the battery cell. Due to the excellent conductivity of the hard aluminum bar, it is also commonly used in the performance testing of the battery cell. Generally, the aluminum bar piece needs to be welded on the cell pole, and the aluminum bar piece and the current line of the charge and discharge test cabinet are screwed together to test different performances. Although the aluminum tab is made of relatively soft metal aluminum as its main material, the aluminum tab is usually an one-piece structure and still has a relatively high hardness. As a result, no matter the aluminum tab is used to connect battery cells in a battery module or to test the performance of battery cells, during the welding process between the battery pole and the tab or the locking process of the current line with the tab through screws, there will be a large interaction force between the battery pole or the current line and the tab. Not only is the degree of freedom poor during installation, but as the test progresses, the above-mentioned interaction force will make the contact between the battery pole or the current line and the tab poor, thereby resulting in an increase in contact resistance and inaccurate test data, which needs to be solved urgently. Utility Model Content

[0004] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides a square battery cell connecting bar, which can effectively reduce the interaction force between the bar and the current line or the terminal during the installation process, and ensure good contact between the bar and the current line or the terminal.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A square battery cell connecting bar comprises a bar body, which is formed by combining at least two layers of single thin sheets. Along the length direction of the single thin sheets, the single thin sheets are sequentially arranged as a first welding section, a buffer section, and a second welding section. The first welding sections and second welding sections of adjacent single thin sheets are fixed to each other.

[0007] As a further solution of the utility model: the buffer section is a U-shaped structure with an opening facing downward, and multiple layers of buffer sections overlap each other.

[0008] As a further solution of the present invention: the buffer segment is a W-shaped structure, and multiple layers of buffer segments overlap each other.

[0009] As a further solution of the utility model: gaps are provided between adjacent buffer sections.

[0010] As a further solution of the present invention: the buffer section is made of elastic material, and the buffer section is flush with the first welding section and the second welding section.

[0011] As a further solution of the utility model: the second welding section is provided with a current line connection hole, and the current line connection holes on adjacent thin sheets are connected to each other.

[0012] As a further solution of the utility model: the current line connection holes are arranged in two or more along the length direction of the single sheet.

[0013] As a further solution of the utility model: a battery cell positioning hole is opened on the first welding section, and the battery cell positioning holes on adjacent thin sheets are connected to each other.

[0014] As a further solution of the utility model: adjacent first welding sections and adjacent second welding sections are connected by ultrasonic welding.

[0015] As a further solution of the utility model: the thickness of the single thin sheet is 0.2-0.5 mm.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The main body of the bar is formed by combining at least two layers of thin sheets. Among them, along the length direction of the thin sheets, the thin sheets are sequentially arranged as a first welding section, a buffer section, and a second welding section, and the first welding sections and the second welding sections of adjacent thin sheets are fixed to each other. Since the adjacent buffer sections are not fixed, it is easier to bend at the buffer section compared to the bar with an integrated structure, which can effectively reduce the interaction force between the main body of the bar and the current line or the terminal during the installation process, ensuring good contact between the main body of the bar and the current line or the terminal.

[0018] 2. The buffer section is a W-shaped structure or a U-shaped structure with the opening facing downward. Multiple layers of buffer sections overlap each other. The groove body formed by the W-shaped structure or the U-shaped structure of the buffer section realizes buffering, making it easier to bend the buffer section.

[0019] 3. A gap is provided between adjacent buffer sections, so that each thin sheet can pass through the gap for buffering, and the buffer section can be further bent.

[0020] 4. There are more than two current line connection holes arranged along the length direction of the single sheet, which is convenient for connecting the charge and discharge test cabinet in parallel with the battery cell, avoiding the problem of poor contact caused by connecting two or more current lines to the same current line connection hole, thereby increasing the contact resistance.

[0021] 5. The main body of the bar is set to the required length according to the test requirements of the charge and discharge test cabinet, and the battery cell positioning holes and current line connection holes are set at both ends respectively, so that the entire main body of the bar is used, there is no waste of resources, thereby saving the cost of test auxiliary materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of Example 1 of the present utility model.

[0023] Figure 2 This is a schematic diagram of the structure of Example 3 of the present utility model.

[0024] In the figure: 10, single sheet; 11, first welding section; 111, battery cell positioning hole; 12, buffer section; 13, second welding section; 131, current line connection hole. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] For ease of understanding, the specific structure and working mode of the utility model are further described below in conjunction with the accompanying drawings:

[0027] The specific structure of the utility model refers to Figure 1-2 As shown, the main structure includes at least two layers of single sheets 10 combined to form a bar sheet body. In the length direction of the single sheet 10, the single sheet 10 is sequentially arranged as a first welding section 11, a buffer section 12, and a second welding section 13, and the first welding sections 11 and the second welding sections 13 of adjacent single sheets 10 are fixed to each other. Since adjacent buffer sections 12 are not fixed, it is easier to bend at the buffer section 12 compared to a bar sheet with an integrated structure.

[0028] Example 1, reference Figure 1 As shown, the buffer segment 12 is a U-shaped structure with its opening facing downward, and multiple layers of buffer segments 12 overlap each other. The groove body formed by the U-shaped structure of the buffer segment 12 realizes buffering, making it easier to bend the buffer segment 12.

[0029] In Example 2, the buffer section is a W-shaped structure, and the multiple buffer sections 12 are overlapped with each other. The buffer sections 12 are formed by the W-shaped structure to achieve buffering, making it easier to bend the buffer sections 12.

[0030] In embodiments 1 and 2, gaps are provided between adjacent buffer sections 12, so that each single sheet 10 can pass through the gap for buffering, and further bend the buffer section 12. In addition, in embodiments 1 and 2, the first welding section 11, the buffer section 12, and the second welding section 13 of the single sheet 10 are made of the same material, which is convenient for processing and combination to form the main body of the sheet.

[0031] Embodiment 3, as Figure 2 As shown, the buffer section 12 is made of elastic material, which can be conductive rubber or conductive plastic, etc., and the buffer section 12 is flush with the first welding section 11 and the second welding section 13. The buffer section 12 formed of elastic material makes it easier to bend the buffer section 12.

[0032] In the above extrusion, Figure 1 and Figure 2 As shown, the second welding section 13 is provided with a current line connection hole 131, and the current line connection holes 131 on adjacent thin sheets 10 are connected to each other for connection with the current line on the charge and discharge test cabinet. Furthermore, the current line connection holes 131 are arranged to be two or more arranged along the length direction of the thin sheet 10, so that when the charge and discharge test cabinet is connected in parallel with the battery cell, poor contact caused by connecting two or more current lines to the same current line connection hole 131 is avoided, thereby avoiding the problem of increased contact resistance.

[0033] In addition, if Figure 1 and Figure 2 As shown, a cell positioning hole 111 is formed on the first welding section 11 , and the cell positioning holes 111 on adjacent thin sheets 10 are connected to each other for connection with the positive electrode column or the negative electrode column of the cell.

[0034] Adjacent first welding segments 11 and adjacent second welding segments 13 are connected by ultrasonic welding, so that the first welding segments 11 and the second welding segments 13 are stably connected.

[0035] The single sheet 10 has a thickness of 0.2-0.5 mm, and is not only well conductive but also easy to bend.

[0036] It is worth mentioning that since the traditional bar piece body is often used to connect the battery cells to each other, both ends of the bar piece body are used to connect the battery cell pole battery positioning holes 111, and the length of the bar piece body is relatively long. Therefore, when the traditional bar piece body is directly used in the charge and discharge test cabinet, the current line of the charge and discharge test cabinet is often fixed in the middle of the bar piece body, and one end of the bar piece body is fixed to the battery cell pole, and the other end is often not used, which causes a waste of resources and an increase in the cost of test auxiliary materials. The bar piece body in the present application is set to the required length according to the test requirements of the charge and discharge test cabinet, and the battery cell positioning hole 111 and the current line connection hole 131 are respectively set at both ends, so that the entire bar piece body can play a role, there is no waste of resources, and the cost of test auxiliary materials is saved.

[0037] Of course, for those skilled in the art, the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0038] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0039] The technology, shape and structure parts not described in detail in the present invention are all known technologies.

Claims

1. A square battery cell connection bar, comprising a bar body, characterized in that: The main body of the sheet is formed by combining at least two layers of single thin sheets (10). Along the length direction of the single thin sheets (10), the single thin sheets (10) are sequentially arranged as a first welding section (11), a buffer section (12) and a second welding section (13). The first welding sections (11) and the second welding sections (13) of adjacent single thin sheets (10) are fixed to each other.

2. A square battery cell connection bar according to claim 1, characterized in that: The buffer section (12) is a U-shaped structure with its opening facing downward, and multiple layers of buffer sections (12) are overlapped with each other.

3. A square battery cell connection bar according to claim 2, characterized in that: The buffer section (12) is a W-shaped structure, and multiple layers of buffer sections (12) are overlapped with each other.

4. A square battery cell connection bar according to claim 2 or 3, characterized in that: A gap is provided between adjacent buffer sections (12).

5. A square battery cell connection bar according to claim 1, characterized in that: The buffer section (12) is made of elastic material, and the buffer section (12) is flush with the first welding section (11) and the second welding section (13).

6. A square battery cell connection bar according to claim 1 or 2 or 3 or 5, characterized in that: The second welding section (13) is provided with a current line connection hole (131), and the current line connection holes (131) on adjacent single sheets (10) are connected to each other.

7. A square battery cell connection bar according to claim 6, characterized in that: The current line connection holes (131) are arranged to be two or more arranged along the length direction of the single sheet (10).

8. A square battery cell connection bar according to claim 1 or 2 or 3 or 5, characterized in that: The first welding section (11) is provided with a battery cell positioning hole (111), and the battery cell positioning holes (111) on adjacent thin sheets (10) are connected to each other.

9. A square battery cell connection bar according to claim 1 or 2 or 3 or 5, characterized in that: Adjacent first welding sections (11) and adjacent second welding sections (13) are connected by ultrasonic welding.

10. A square battery cell connection bar according to claim 1 or 2 or 3 or 5, characterized in that: The thickness of the single thin sheet (10) is 0.2-0.5 mm.

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