Conductive bars, stamping apparatus, CCS assemblies, and battery modules

Abstract

The application relates to the technical field of batteries, in particular to a conductive row, a stamping device, a CCS assembly and a battery module. The conductive row comprises a first main surface and a second main surface arranged oppositely; a positioning hole penetrating from the first main surface to the second main surface, used for inserting a positioning protrusion of a conductive sheet to position a welding position of the conductive sheet and the conductive row; wherein the positioning hole is an oblong hole. The conductive row provided in the application can reduce the risk of cracking of the conductive row at the positioning hole during stamping of the positioning hole, because compared with stamping of a rectangular hole with a right-angle corner part, stamping of the positioning hole with an oblong hole configuration will not cause excessive stress concentration at the hole wall. In addition, for the further optimized design of the oblong hole, the positioning protrusion inserted into the positioning hole can be inhibited from moving along the length direction, in particular, the positioning protrusion is inhibited from moving to the inner wall of the arc surface, which helps to position the welding position of the conductive sheet and the conductive row into a more appropriate range.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a conductive busbar, stamping equipment, CCS component and battery module. Background Technology

[0002] To monitor the operating voltage and / or operating temperature of individual battery cells in a battery module, a battery signal acquisition component needs to be installed on the battery module. This component may, for example, include a conductive sheet soldered to a busbar.

[0003] To facilitate the welding and positioning of the conductive sheet and the conductive busbar in the battery signal acquisition component, patent document CN119890503 A (hereinafter referred to as Patent Document 1) proposes to open a slot on the conductive busbar and form a protrusion on the conductive sheet. By inserting the protrusion into the slot, the welding and positioning of the conductive sheet and the conductive busbar can be achieved. However, Patent Document 1 does not describe the specific shape of the slot in detail.

[0004] The inventors discovered that when the slot of the conductive busbar is designed as a rectangular through hole (through groove), although the conductive sheet and the through groove can be positioned and engaged relatively well, the conductive busbar is very prone to cracking at the corner of the through groove during the processing of such a through groove, which limits the yield of the finished conductive busbar. Summary of the Invention

[0005] In view of this, this application proposes a conductive busbar, a stamping device, a CCS component, and a battery module.

[0006] Firstly, a conductive bus is proposed, comprising: The first and second main surfaces are set relative to each other; A positioning hole extends from the first main surface to the second main surface, and is used for the insertion of a positioning protrusion of the conductive sheet to position the welding position of the conductive sheet and the conductive busbar. The positioning hole is an oblong hole.

[0007] In some possible implementations, the elongated hole includes: Two planar inner walls are arranged opposite to each other in the first direction; Two arc-shaped inner walls are arranged opposite each other in a second direction perpendicular to the first direction, and the two ends of each arc-shaped inner wall are respectively adjacent to the ends of the two planar inner walls.

[0008] In some possible implementations, the two planar inner walls are parallel to each other, and the elongated hole has a larger dimension along the second direction than along the first direction.

[0009] In some possible implementations, the dimension of the arcuate inner wall gradually decreases along the first direction in a second direction away from the inner walls of the two planes.

[0010] In some possible implementations, the conductive bus includes: An arched portion, wherein the second main surface defines a receiving space at the arched portion to receive components of the battery module; Two electrode connection portions extend from opposite sides of the arched portion and are used to connect the electrode portions of two battery cells of the battery module, respectively. The positioning hole is provided in at least one of the electrode connection portions.

[0011] In some possible implementations, both electrode connection portions are provided with positioning holes, and the conductive busbar is an aluminum busbar.

[0012] In a second aspect, a stamping apparatus for manufacturing a conductive busbar as described in the first aspect is proposed, comprising a stamping head whose shape is formed to correspond to the cross-sectional shape of the positioning hole.

[0013] Thirdly, a CCS component is proposed, including: The conductive bus as described in the first aspect; The conductive sheet includes the positioning protrusion, which is inserted into the positioning hole from the first main surface side, and the conductive sheet is welded to the first main surface.

[0014] In some possible implementations, the width of the positioning protrusion is substantially equal to the width of the inner wall of the plane.

[0015] Fourthly, a battery module is proposed, comprising: Multiple battery cells, including a first battery cell and a second battery cell; As described in the third aspect, in the CCS assembly, the conductive bus connects the electrode portion of the first battery cell and the electrode portion of the second battery cell.

[0016] According to the conductive bus proposed in this application, the positioning holes are constructed as elongated holes rather than rectangular holes. Therefore, the risk of cracking at the positioning holes during stamping can be reduced because, compared to stamping rectangular holes with right-angled corners, stamping elongated holes does not generate excessive stress concentration at the hole walls. Furthermore, as a preferred design, for each arcuate inner wall of the elongated hole, the dimension of the arcuate inner wall gradually decreases along the width direction of the elongated hole in the length direction away from the two planar inner walls. Therefore, it can suppress the positioning protrusions that are inserted into the positioning holes from shifting along the length direction, particularly suppressing the positioning protrusions from shifting to the arcuate inner wall. This helps to position the welding position of the conductive sheet to the conductive bus within a more suitable range. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this application, and are not intended to limit this application.

[0018] Figure 1 This is a schematic diagram of the structure of the conductive bus provided in the embodiment of this application.

[0019] Figure 2 This is a schematic diagram of a portion of the CCS component provided in an embodiment of this application.

[0020] Figure 3 yes Figure 2 A schematic diagram of the conductive sheet on the right side of the middle section.

[0021] Figure 4 yes Figure 2 A schematic diagram of the conductive sheet on the left side of the middle section.

[0022] Figure 5 This is a side view of a portion of the conductive sheet.

[0023] Explanation of reference numerals in the attached figures: 100-CCS components; DR1 - First direction, DR2 - Second direction; 10 - Conductive busbar, 20 - Conductive sheet, 30 - Temperature sensor; S1 - First main surface, S2 - Second main surface; 1-Location hole, 1a-Flat inner wall, 1b-Curved inner wall; 2-Arched portion; 3-Electrode connection part; 4-Positioning card protrusion. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the described embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It is understood that, without conflict, some technical means of the various embodiments described herein can be substituted for or combined with each other.

[0025] In the description of this application, the terms "first," "second," etc., are used only to distinguish the described objects and have no sequential or technical meaning. Therefore, objects specified with "first," "second," etc., may explicitly or implicitly include one or more of those objects. Furthermore, the words "one" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one, while "multiple" indicates at least two.

[0026] In the description of this application, references to "one embodiment" or "some embodiments" mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0027] Figure 1 A conductive busbar 10 according to an embodiment of this application is shown. The conductive busbar 10 is an aluminum busbar, which includes a first main surface S1 and a second main surface S2 disposed opposite to each other, and two positioning holes 1 extending from the first main surface S1 to the second main surface S2. Of course, the conductive busbar 10 can also be a copper plate.

[0028] See also Figure 2 , Figure 2 A portion of a CCS (Cells Contact System, Integrated Busbar) assembly 100 is shown, which includes... Figure 1 The conductive strip 10 is mounted on the conductive strip 10, and two conductive pieces 20 are mounted on the conductive strip 10. Each conductive piece 20 has a locating protrusion 4 formed by bending. This locating protrusion 4 is inserted into a locating hole 1 from the first surface side of the conductive strip 10, thereby positioning the relative position of the conductive piece 20 to the conductive strip 10. The conductive piece 20 is then welded to the conductive strip 10 by laser welding. In other words, the locating hole 1 of the conductive piece 20 is used for the insertion of the locating protrusion 4 of the conductive piece 20 to position the welding position between the conductive piece 20 and the conductive strip 10.

[0029] Please see Figure 5 and combined Figure 3 and Figure 4 As shown, the positioning protrusion 4 of the conductive sheet 20 is formed by bending a portion of the conductive sheet 20, and has a U-shaped structure, thus possessing a certain degree of elasticity. Therefore, after the positioning protrusion 4 is inserted into the positioning hole 1 of the conductive busbar 10, the positioning protrusion 4 has a tendency to expand outward in the first direction DR1, thereby elastically abutting against the inner wall of the positioning hole 1 (the two planar inner walls 1a described later).

[0030] In this embodiment, the positioning hole 1 is an oblong hole (or waist-shaped hole) rather than a rectangular hole. This design reduces the risk of the conductive busbar 10 cracking at the positioning hole 1 during stamping, because compared to stamping a rectangular hole with right-angled corners, stamping an oblong hole configuration of the positioning hole 1 will not generate excessive stress concentration at its hole wall.

[0031] The elongated hole includes two planar inner walls 1a disposed opposite each other in the first direction DR1 and two arc-shaped inner walls 1b disposed opposite each other in the second direction DR2. Each arc-shaped inner wall 1b has its two ends adjacent to the ends of two straight sides, and the first direction DR1 is perpendicular to the second direction DR2. With this design, the two planar inner walls 1a can engage well with the positioning protrusion 4 of the conductive sheet 20 to position the conductive sheet 20. The arc-shaped inner walls 1b adjacent to the planar inner walls 1a can avoid forming sharp corners, such as 90°, at the positioning hole 1, thereby avoiding excessive stress concentration at the positioning hole 1 during the stamping process of the conductive busbar 10, which could lead to cracking of the conductive busbar 10.

[0032] Furthermore, for each arc-shaped inner wall 1b, in the second direction DR2 away from the two planar inner walls 1a, the size of the arc-shaped inner wall 1b gradually decreases along the first direction DR1. That is, at the location adjacent to the two planar inner walls 1a, the size of the arc-shaped inner wall 1b along the first direction DR1 is the largest. In this way, the positioning protrusion inserted into the positioning hole 1 can be prevented from shifting along the second direction DR2, and in particular, the positioning protrusion can be prevented from shifting to the arc-shaped inner wall 1b. This helps to position the welding position of the conductive sheet 20 and the conductive busbar 10 within a more suitable range.

[0033] In some embodiments, the width of the positioning protrusion 4 (i.e., the dimension in the second direction DR2) is basically equal to the width of the inner wall 1a. In this way, when the positioning hole 1 is inserted into the positioning hole 1, it is located exactly between the two inner walls 1a and is not easy to slip into the arc-shaped wall surface, thereby effectively positioning the welding position of the conductive sheet 20 on the conductive busbar 10.

[0034] The conductive bus 10 includes an arched portion 2 and two electrode connection portions 3 extending from opposite sides of the arched portion 2. The second main surface S2 defines a receiving space at the arched portion 2 for accommodating related components of the battery module (e.g., accommodating the top edge of a separator sandwiched between two adjacent battery cells), thereby helping to position the conductive bus 10 on the battery module.

[0035] Two electrode connection portions 3 extend from opposite sides of the arched portion 2 into flat plates, respectively, for connecting the electrode portions of two battery cells of the battery module. For example, in an implementation, one of the two electrode connection portions 3 is connected to the positive electrode portion of the first battery cell, and the other is connected to the negative electrode portion of the second battery cell, thereby connecting the two battery cells of the battery module in series.

[0036] Furthermore, two positioning holes 1 are respectively provided at the two electrode connection parts 3 of the conductive busbar 10 so that the conductive sheet 20 can be as close as possible to the battery cell.

[0037] exist Figure 1 Of the two conductive plates 20, the right conductive plate 20 is used only to collect the voltage signal of the battery cell, while the left conductive plate 20 is used to collect both the voltage and temperature signals of the battery cell. More specifically, a temperature sensor 30 is mounted on the left conductive plate 20, and the temperature signal lead (omitted in the figure) is connected to this temperature sensor 30. The temperature of the battery cell can be transmitted through the conductive plate 20 to the temperature sensor 30 and converted into a corresponding electrical signal. This electrical signal representing the battery temperature is transmitted to the BMS (Battery Management System) via the temperature signal lead. The right conductive plate 20 does not have a temperature sensor 30, and two voltage signal leads (omitted in the figure) are connected to the left and right conductive plates 20 respectively to transmit the battery voltage signal to the BMS.

[0038] Based on the foregoing description, this application provides a CCS component 100, which includes the aforementioned conductive bus 10 and conductive sheet 20. The conductive bus 10 includes a first main surface S1 and a second main surface S2 disposed opposite to each other, and a positioning hole 1 extending from the first main surface S1 to the second main surface S2, wherein the positioning hole 1 is an elongated hole. The conductive sheet 20 includes a positioning protrusion 4, which is inserted into the positioning hole 1 from the first main surface S1 side, and the conductive sheet 20 is welded to the first main surface S1 of the conductive bus 10.

[0039] In conjunction with the foregoing description, this application also provides a battery module comprising a plurality of battery cells and the aforementioned CCS assembly 100. The plurality of battery cells includes a first battery cell and a second battery cell, and the conductive bus 10 in the CCS assembly 100 connects the electrode portions of the first battery cell and the electrode portions of the second battery cell. Since those skilled in the art can understand such a battery module based on the foregoing discussion, illustrations of the battery module are omitted.

[0040] This application embodiment also provides a stamping apparatus for stamping the aforementioned conductive sheet 20. The stamping apparatus includes a stamping head, the shape of which is formed to correspond to the cross-sectional shape of the positioning hole 1. Since those skilled in the art can understand such a stamping apparatus based on the foregoing discussion, illustrations of the stamping apparatus are omitted.

Claims

1. A conductive bus, characterized in that, include: The first and second main surfaces are set relative to each other; A positioning hole extends from the first main surface to the second main surface, and is used for the insertion of a positioning protrusion of the conductive sheet to position the welding position of the conductive sheet and the conductive busbar. The positioning hole is an oblong hole.

2. The conductive bus according to claim 1, characterized in that, The oblong hole includes: Two planar inner walls are arranged opposite to each other in the first direction; Two arc-shaped inner walls are arranged opposite each other in a second direction perpendicular to the first direction, and the two ends of each arc-shaped inner wall are respectively adjacent to the ends of the two planar inner walls.

3. The conductive bus according to claim 2, characterized in that, The two planar inner walls are parallel to each other, and the elongated hole has a larger dimension along the second direction than along the first direction.

4. The conductive bus according to claim 2 or 3, characterized in that, In a second direction away from the inner walls of the two planes, the dimension of the inner wall of the arc surface gradually decreases along the first direction.

5. The conductive bus according to claim 1, characterized in that, The conductive bus includes: An arched portion, wherein the second main surface defines a receiving space at the arched portion to receive components of the battery module; Two electrode connection portions extend from opposite sides of the arched portion and are used to connect the electrode portions of two battery cells of the battery module, respectively. The positioning hole is provided in at least one of the electrode connection portions.

6. The conductive bus according to claim 5, characterized in that, Both electrode connection portions are provided with positioning holes, and the conductive busbar is an aluminum busbar.

7. A stamping apparatus for manufacturing conductive busbars as described in any one of claims 1 to 6, characterized in that, It includes a stamping head, the shape of which is formed to correspond to the cross-sectional shape of the positioning hole.

8. A CCS component, characterized in that, include: The conductive bus as described in any one of claims 1 to 6; The conductive sheet includes the positioning protrusion, which is inserted into the positioning hole from the first main surface side, and the conductive sheet is welded to the first main surface.

9. The CCS component according to claim 8, characterized in that, The width of the positioning card protrusion is approximately equal to the width of the inner wall of the plane.

10. A battery module, characterized in that, include: Multiple battery cells, including a first battery cell and a second battery cell. ； In the CCS assembly as described in claim 8 or 9, the conductive bus connects the electrode portion of the first battery cell and the electrode portion of the second battery cell.

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