Integrated busbar and battery module
By setting a cover in the pressure relief hole of the integrated busbar bottom plate, the problem of welding slag and foreign matter entering the battery is solved, and the safety and service life of the battery module are improved.
Patent Information
- Application Number
- CN202422274819.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-18
AI Technical Summary
Welding slag or foreign matter can easily enter the battery through the bottom plate of the integrated busbar, affecting the battery's safety and service life.
A cover is provided in the pressure relief hole of the bottom plate of the integrated busbar to form a gap to prevent welding slag and foreign matter from entering the battery cell, while ensuring that the explosion-proof valve is opened smoothly.
It improves the safety and service life of the battery module, prevents welding slag and foreign matter from entering the battery cell, and ensures that the explosion-proof valve is opened smoothly when the battery cell is thermally out of control.
Smart Images
Figure CN223140899U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of energy storage batteries, and particularly relates to an integrated busbar and a battery module. Background Art
[0002] An integrated busbar (Cells Contact System, abbreviated as CCS) belongs to a part of the automotive BMS power system. The flexible circuit board in the integrated busbar is used to replace the traditional acquisition wire harness. Compared with the traditional wire harness, due to its characteristics such as high integration, ultra-thin thickness, and ultra-softness, the flexible circuit board has outstanding advantages in terms of safety, light weight, and regular layout. Coupled with the fact that the integrated busbar integrates the previously separately assembled plastic structural parts, aluminum busbars, etc. with the flexible circuit board, the thickness is greatly reduced, and the structure can be customized, so that the integrated busbar can be directly placed on the battery pack by a robotic arm during assembly, with a high degree of automation and suitable for large-scale mass production.
[0003] An avoidance hole is usually provided in the middle of the bottom plate of the integrated busbar corresponding to the battery explosion-proof valve to ensure the smooth opening of the explosion-proof valve. However, in this way, during the welding process between the aluminum busbar and the electrode post of the battery cell, it is easy for welding slag to splash onto the explosion-proof valve of the battery cell, or for foreign objects to enter between the battery cells.
[0004] Correspondingly, a new technical solution is needed in this field to solve the above problems. Summary of the Utility Model
[0005] In order to solve at least one of the above problems in the prior art, that is, to solve the problem that welding slag or foreign objects easily enter the battery through the avoidance hole in the bottom plate of the integrated busbar, the present application provides an integrated busbar, including a bottom plate, a busbar, a flexible circuit board, and a welding piece. The flexible circuit board and the busbar are both arranged on the upper side of the bottom plate. One end of the welding piece is connected to the flexible circuit board, and the other end of the welding piece is connected to the busbar. A plurality of pressure relief holes are formed in the bottom plate, and a covering member is arranged in the pressure relief holes, and a gap is formed between the covering member and the pressure relief holes.
[0006] For the integrated busbar of the present application, by arranging a covering member in the pressure relief holes of the bottom plate, it can not only ensure the smooth opening of the explosion-proof valve when the battery cell undergoes thermal runaway, but also prevent welding slag and foreign objects from entering the battery cell through the pressure relief holes, ultimately improving the safety and service life of the integrated busbar.
[0007] In the preferred technical solution of the above integrated busbar, the covering member is in a sheet shape, and the outer edge of the covering member is connected to the inner edge of the pressure relief hole.
[0008] In the preferred technical solution of the above integrated busbar, the pressure relief hole is an oblong hole, the covering member is strip-shaped, two long sides of the strip shape are respectively connected to two straight inner sides of the oblong hole through connecting ribs, and two short sides of the strip shape are arc-shaped and enclose two arc-shaped gaps with two arc-shaped inner sides of the oblong hole.
[0009] In the preferred technical solution of the above integrated busbar, at least some of the pressure relief holes are respectively formed in a plurality of protrusions protruding upward from the bottom plate.
[0010] By arranging the pressure relief holes in the protrusions protruding upward from the bottom plate, more valve opening space can be left for the explosion-proof valve below, avoiding the covering member from affecting the valve opening.
[0011] In the preferred technical solution of the above integrated busbar, a plurality of the pressure relief holes are arranged in a straight line along the length direction of the bottom plate.
[0012] In the preferred technical solution of the above integrated busbar, the covering member and the bottom plate are integrally formed.
[0013] By integrally forming the covering member and the bottom plate, the manufacturing method of the bottom plate is simple and the cost is low.
[0014] In the preferred technical solution of the above integrated busbar, the flexible circuit board is arranged in a U shape, and at least some of the pressure relief holes are located between two sides of the U shape.
[0015] In the preferred technical solution of the above integrated busbar, a shear notch is arranged on the welding piece.
[0016] By arranging a shear notch on the welding piece, when replacing the flexible circuit board, the welding piece can be directly sheared from the shear notch, and the welding piece of the new flexible circuit board can be welded on the previous welding piece, realizing the rapid replacement of the flexible circuit board, overcoming the problem of too long cycle caused by cutting all the welding pieces on the bottom plate and reprocessing the bottom plate and then welding the welding pieces in the traditional replacement of the flexible circuit board, and improving the maintenance efficiency.
[0017] In the preferred technical solution of the above integrated busbar, the thickness of the welding piece is any value in the range of 1.3 - 1.7 mm.
[0018] This application reduces the thickness of the welding piece, making the welding piece easier to be sheared.
[0019] This application also provides a battery module, and the battery module includes the integrated busbar according to any one of the above technical solutions.
[0020] For the battery module of the present application, by providing a covering member in the pressure relief hole of the bottom plate of the integrated busbar, it is possible to prevent welding slag and foreign objects from entering the battery cell through the pressure relief hole without affecting the opening of the valve of the battery cell, thereby improving the safety and service life of the battery module. Description of the Drawings
[0021] The present application will be described below with reference to the accompanying drawings. In the drawings:
[0022] Figure 1 is a top view of the integrated busbar of the present application;
[0023] Figure 2 is Figure 1 a partial enlarged view at A;
[0024] Figure 3 is a structural diagram of the battery module of the present application;
[0025] Figure 4 is Figure 3 a partial enlarged view at B.
[0026] List of Reference Numerals
[0027] 10. Integrated busbar; 11. Bottom plate; 111. Pressure relief hole; 112. Covering member; 113. Connecting rib; 114. Boss; 12. Busbar; 13. Flexible circuit board; 14. Welding piece; 141. Cutting notch; 20. Battery cell; 30. Battery module. Detailed Embodiments
[0028] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present application and are not intended to limit the protection scope of the present application. For example, although all the pressure relief holes in the drawings are arranged in the middle of the width direction of the bottom plate, this positional relationship is not fixed, and those skilled in the art can adjust it as needed to adapt to specific application scenarios.
[0029] It should be noted that in the description of the present application, the terms indicating directions or positional relationships such as "up", "down", "vertical", "horizontal", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, in the description of the present application, "a plurality of" means at least two.
[0030] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0031] First, refer to Figure 1 , and briefly introduce the integrated busbar of this application.
[0032] As Figure 1 shown, to solve the problem that welding slag or foreign objects easily enter the battery through the relief holes on the bottom plate of the integrated busbar, the integrated busbar 10 of this application includes a bottom plate 11, a busbar 12, a flexible circuit board 13, and a welding piece 14. The flexible circuit board 13 and the busbar 12 are both arranged on the upper side of the bottom plate 11. One end of the welding piece 14 is connected to the flexible circuit board 13, and the other end of the welding piece 14 is connected to the busbar 12. A plurality of relief holes 111 are formed on the bottom plate 11, and a covering member 112 is arranged in the relief holes 111, and a gap is formed between the covering member 112 and the relief holes 111.
[0033] During the application process, the integrated busbar 10 is fixed to the tops of a plurality of battery cells 20, and the relief holes 111 are located above the explosion-proof valves of the battery cells 20. The pole columns of each battery cell 20 protrude upward and are fixed to the busbar 12 by welding. Since the relief holes 111 are covered by the covering member 112, welding slag and other foreign objects during the welding process are not easily passed through the relief holes 111 into the space between the battery cells 20. Since a gap is also formed between the covering member 112 and the relief holes 111, when the explosion-proof valve of the battery cell 20 opens due to thermal runaway, the airflow ejected by the explosion-proof valve can be discharged through the gap.
[0034] It can be seen that for the integrated busbar 10 of this application, by arranging the covering member 112 in the relief holes 111 of the bottom plate 11, it can not only ensure that the explosion-proof valve opens smoothly when the battery cell 20 undergoes thermal runaway, but also prevent welding slag and foreign objects from entering the battery cell 20 through the relief holes 111, ultimately improving the safety and service life of the integrated busbar 10.
[0035] Next, in combination with Figure 1 , Figure 2 and Figure 4 , a specific implementation manner of the integrated busbar of this application will be introduced.
[0036] As Figure 1 , Figure 2 and Figure 4As shown, in a specific embodiment, the integrated busbar 10 includes a bottom plate 11, a busbar 12, a flexible circuit board 13, and a welding piece 14.
[0037] The material of the bottom plate 11 is plastic, and it is generally in a long rectangular shape. Pressure relief holes 111 and through holes (not shown in the figure) are provided on the bottom plate 11. A plurality of pressure relief holes 111 are provided, and the plurality of pressure relief holes 111 are arranged in a straight line along the length direction of the bottom plate 11 (i.e., Figure 1 the horizontal direction in the figure), and a row of pressure relief holes 111 is located approximately in the middle of the bottom plate 11 in the width direction of the bottom plate 11 (i.e., Figure 1 the vertical direction in the figure). In this application, the pressure relief holes 111 are oblong holes, and at least part of the pressure relief holes 111 are provided on a boss 114 formed by protruding upward from the bottom plate 11. Specifically, the four sides enclosing the pressure relief holes 111 include two straight inner sides and two arc-shaped inner sides. The two straight inner sides are opposite to each other, and the two arc-shaped inner sides are opposite to each other. The extending direction of the two straight inner sides is the length direction of the bottom plate 11. Refer to Figure 4 , among the plurality of pressure relief holes 111, except for one pressure relief hole 111 at the end, the other pressure relief holes 111 are respectively provided on a plurality of bosses 114 formed by protruding upward from the bottom plate 11. After being set, the pressure relief holes 111 provided on the bosses 114 protrude upward from the bottom plate 11 by approximately 2 mm.
[0038] See Figure 2 and Figure 4 , the covering member 112 is in a sheet shape, and the outer edge of the covering member 112 is connected to the inner edge of the pressure relief hole 111. Specifically, the covering member 112 is in a long strip shape, and the long strip shape is adapted to the inner edge of the oblong hole, including two long sides extending in a straight line and two short arc-shaped sides. The two long sides of the long strip shape are respectively connected to the two straight inner sides of the oblong hole through connecting ribs 113, and two "U"-shaped gaps are formed between the two short arc-shaped sides and the two arc-shaped inner sides of the oblong hole. Preferably, the covering member 112 and the bottom plate 11 are integrally formed. More specifically, the covering member 112 and the bottom plate 11 are formed by thermoforming and then stamping.
[0039] By providing the pressure relief holes 111 on the bosses 114 formed by protruding upward from the bottom plate 11, more valve opening space can be left for the explosion-proof valve below, and the covering member 112 is prevented from affecting valve opening. By integrally forming the covering member 112 and the bottom plate 11, the manufacturing method of the bottom plate 11 is simple and the cost is low.
[0040] A plurality of through holes are provided, and the plurality of through holes are arranged along the length direction of the bottom plate 11 and are arranged on both sides of the pressure relief holes 111 with a row of pressure relief holes 111 as the demarcation line. When the bottom plate 11 is installed on the top of the battery cell 20, the electrode posts of the battery cell 20 can extend out through the through holes, facilitating subsequent welding operations.
[0041] The flexible circuit board 13 is arranged in a U shape and is fixed on the upper side of the bottom plate 11 by bonding or other means. After being fixed, the two sides of the U shape extend along the length direction of the bottom plate 11 and are located on both sides of a plurality of pressure relief holes 111 arranged on the boss 114.
[0042] The bus bar 12 can be a copper bar or an aluminum bar. A plurality of installation grooves for installing the bus bar 12 are arranged on the bottom plate 11. Two of the above-mentioned through holes correspond to each groove. The bus bar 12 is correspondingly embedded in the installation groove and is correspondingly welded to the pole columns of two battery cells 20.
[0043] The welding piece 14 is in a rounded rectangular shape, and its quantity corresponds to that of the bus bar 12. One end of each welding piece 14 is welded to a bus bar 12, and the other end is welded to the flexible circuit board 13. A cut 141 is arranged on the bus bar 12. The cut 141 is a long oval hole in the shape of a long strip in this application. The thickness of the welding piece 14 is any value between 1.3 mm and 1.7 mm. Preferably, the thickness of the welding piece 14 is 1.5 mm.
[0044] In the prior art, the flexible circuit board 13 is connected to the bus bar 12 through the welding piece 14. Since the flexible circuit board 13 is a vulnerable part that needs to be replaced, and the traditional welding piece 14 has a relatively thick size, the traditional method of replacing the flexible circuit board 13 requires first cutting the welding piece 14 from the bus bar 12, removing all the welding pieces 14 and the flexible circuit board 13 as a whole, then reprocessing the bottom plate 11 and welding a new flexible circuit board 13. The replacement process is cumbersome and has a long cycle. In this application, the size of the welding piece 14 is thinned, and the cut 141 is arranged. When replacing the flexible circuit board 13, the welding piece 14 can be directly sheared from the cut 141, and the welding piece 14 of the new flexible circuit board 13 can be welded to the previous welding piece 14, realizing the rapid replacement of the flexible circuit board 13, overcoming the problem of the excessively long cycle caused by the need to cut all the welding pieces 14 on the bottom plate 11 and reprocess the bottom plate 11 and then weld the welding pieces 14 when replacing the traditional flexible circuit board 13, and improving the maintenance efficiency. And thinning the thickness of the welding piece 14 makes the welding piece 14 easier to be sheared.
[0045] It should be noted that the above-mentioned preferred embodiments are only used to illustrate the principle of this application and are not intended to limit the protection scope of this application. Without departing from the principle of this application, those skilled in the art can adjust the above-mentioned setting methods so that this application can be applied to more specific application scenarios.
[0046] For example, in an alternative embodiment, although the above embodiment is described in conjunction with the covering member 112 being sheet-shaped, the specific shape of the covering member 112 is not restrictive. Those skilled in the art can adjust it as long as the adjusted covering member 112 can cover the pressure relief hole 111 and form a gap with the pressure relief hole 111. For example, the covering member 112 can also be rod-shaped or grid-shaped, etc.
[0047] Again, in another alternative embodiment, although the pressure relief hole 111 is introduced by taking an oblong hole as an example, the specific shape of the pressure relief hole 111 is not unique. Those skilled in the art can adjust it based on the specific application scenario. For example, the pressure relief hole 111 can also be circular, rectangular, or other irregular shapes, etc.
[0048] Again, in another alternative embodiment, the above embodiment is described by taking the outer edge of the covering member 112 and the inner edge of the pressure relief hole 111 being connected by the connecting rib 113 as an example. However, the connection manner between the covering member 112 and the pressure relief hole 111 is not limited to this. Those skilled in the art can adjust it. For example, the outer edge of the covering member 112 can also be directly connected to the inner edge of the pressure relief hole 111. Again, both the long side and the short side of the covering member 112 can also be connected to the inner edge of the pressure relief hole 111 through the connecting rib 113, etc.
[0049] Again, in another alternative embodiment, the embodiment in which some of the pressure relief holes 111 are correspondingly opened on the convex platform 114 of the bottom plate 11 is merely exemplary. Those skilled in the art can adjust it based on the specific application scenario, and such adjustment does not deviate from the principle of this application. For example, on the premise that the structural space permits, all the pressure relief holes 111 can be correspondingly arranged on the convex platform 114 one by one, or all the pressure relief holes 111 can be not arranged on the convex platform 114 at all.
[0050] Again, in another alternative embodiment, the linear arrangement of the pressure relief holes 111 along the length direction of the bottom plate 11 is only the preferred embodiment of this application. Those skilled in the art can adjust the arrangement form of the pressure relief holes 111 based on the specific application scenario. For example, those skilled in the art can adjust the opening position of the pressure relief holes 111 based on the specific position of the explosion-proof valve of the battery cell 20.
[0051] Again, in another alternative embodiment, the embodiment in which the covering member 112 and the bottom plate 11 are integrally formed is only exemplary. Those skilled in the art can adjust it. For example, the covering member 112 can be snap-connected, bonded, welded, etc. to the pressure relief hole 111. Of course, the integrally formed manner can reduce the manufacturing cost of the bottom plate 11 and simplify the process compared with other forming methods.
[0052] For another example, in another alternative embodiment, although the above embodiment is described in combination with the flexible circuit board 13 being arranged in a U shape, the specific form of the flexible circuit board 13 is not unique, and those skilled in the art can adjust it based on the specific application scenario.
[0053] In another alternative embodiment, the setting method of providing the cut notch 141 on the welding piece 14 is merely exemplary, and those skilled in the art can adjust it. For example, the cut notch 141 may not be provided on the welding piece 14.
[0054] In another alternative embodiment, it is a preferred technical solution that the thickness of the welding piece 14 is between 1.3 - 1.7 mm, but the specific thickness dimension of the welding piece 14 is not fixed, and those skilled in the art can adjust it so that this application is applicable to more specific application scenarios.
[0055] Of course, the above alternative embodiments can be cross - combined with each other, and also with the preferred embodiments, so as to combine new embodiments to be applicable to more specific application scenarios.
[0056] Referring to Figure 3 , this application also provides a battery module 30. The battery module 30 includes the integrated busbar 10 in the above - mentioned embodiment. Specifically, the battery module 30 of this application includes a plurality of battery cells 20 and an integrated busbar 10. The integrated busbar 10 is fixedly installed at the top of the plurality of battery cells 20, and the busbar 12 of the integrated busbar 10 is welded and fixed to the electrode posts of the battery cells 20. After being fixed, a plurality of pressure - relief holes 111 are respectively located above the explosion - proof valves of the plurality of battery cells 20.
[0057] In the battery module 30 of this application, by providing a covering member 112 in the pressure - relief holes 111 of the bottom plate 11 of the integrated busbar 10, it is possible to prevent welding slag and foreign objects from entering the battery cells 20 through the pressure - relief holes 111 without affecting the valve opening of the battery cells 20, thereby improving the safety and service life of the battery module 30.
[0058] Those skilled in the art can understand that although some of the embodiments described herein include certain features included in other embodiments rather than other features, the combination of the features of different embodiments means that it is within the scope of this application and forms different embodiments. For example, in the claims of this application, any one of the claimed embodiments can be used in any combination.
[0059] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principle of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present application.
Claims
1. An integrated busbar, characterized in that, It includes a bottom plate, a bus bar, a flexible circuit board and a welding piece. The flexible circuit board and the bus bar are both arranged on the upper side of the bottom plate. One end of the welding piece is connected to the flexible circuit board, and the other end of the welding piece is connected to the bus bar. A plurality of pressure relief holes are formed in the bottom plate, and a covering piece is arranged in the pressure relief holes, and a gap is formed between the covering piece and the pressure relief holes.
2. The integrated busbar according to claim 1, wherein, The covering piece is sheet-shaped, and the outer edge of the covering piece is connected to the inner edge of the pressure relief hole.
3. The integrated busbar according to claim 2, characterized in that, The pressure relief hole is an oblong hole, the covering piece is strip-shaped, and the two long sides of the strip shape are respectively connected to the two straight inner sides of the oblong hole through connecting ribs. The two short sides of the strip shape are arc-shaped and enclose two arc-shaped gaps with the two arc-shaped inner sides of the oblong hole.
4. The integrated busbar according to claim 1, wherein At least part of the pressure relief holes are correspondingly formed in a plurality of protrusions formed by protruding upward from the bottom plate.
5. The integrated busbar according to claim 1, wherein, The plurality of pressure relief holes are arranged in a straight line along the length direction of the bottom plate.
6. The integrated busbar according to claim 1, characterized in that, The covering piece and the bottom plate are integrally formed.
7. The integrated busbar according to claim 1, characterized in that, The flexible circuit board is arranged in a U shape, and at least part of the pressure relief holes are located between the two sides of the U shape.
8. The integrated busbar according to claim 1, wherein, A cutting notch is arranged on the welding piece.
9. The integrated busbar according to claim 8, wherein, The thickness of the welding piece is any value in the range of 1.3 - 1.7 mm.
10. A battery module, characterized in that, The battery module includes the integrated bus bar according to any one of claims 1 to 9.