A collection device and a battery

Abstract

The present invention relates to the field of battery technology, and in particular to a collection device, comprising a collection board, a signal connection board and a current connection sheet, wherein a connection area is provided on the collection board, a connection groove and a connection disk are provided in the connection area, and the connection groove is located on the inner side of the connection disk; the signal connection sheet is fitted and connected to the connection disk, and a first end of the signal connection sheet is provided with a bending structure, and the bending structure is inserted into the connection groove; the first end of the signal connection sheet is stacked and connected to the connection disk; the current connection sheet is stacked and connected to the second end of the signal connection sheet; the present invention provides a connection groove in the connection area of ​​the collection board and a bending structure at one end of the signal connection sheet, so that when the signal connection sheet is connected to the collection board, not only can one end of the signal connection sheet be fitted with the connection disk, but also the bending structure can be inserted and fixed to the connection groove, which effectively improves the stability of the connection, thereby improving the collection stability and reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, in particular to a collection device and a battery. Background Art

[0002] With the rapid development of new energy technologies, especially the widespread application of electric vehicles and energy storage systems, the series-parallel design of power modules has become more and more common. In this context, the voltage and internal resistance acquisition of a single cell is crucial for the battery management system; the voltage and internal resistance acquisition components generally include an acquisition board, a signal connector and a current connector, and the current connector is connected to the acquisition board through the signal connector; the existing signal connector and acquisition board connection method uses a planar patch process, which is prone to cold soldering, and the patch will produce a void rate due to the influence of temperature, and the pull-out force is insufficient. When the acquisition board and the current connector move relative to each other, the signal connection board is easily connected due to stress, thereby affecting the acquisition, and then affecting the status monitoring of the voltage module.

[0003] Therefore, it is very important for those skilled in the art to design a collection device and a battery with higher connection stability. Summary of the invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a collection device and a battery with higher connection stability to solve the problem in the prior art that cold soldering is easy and the signal connection board is easy to fail in connection when the collection board and the current connection sheet move relative to each other.

[0005] The present invention discloses a collection device for collecting battery cell data, and the scheme thereof comprises:

[0006] A collection board, wherein a connection area is provided on the collection board, a connection groove and a connection disk are provided in the connection area, and the connection groove is located on the inner side of the connection disk;

[0007] A signal connection sheet is attached and connected to the connection disk, and a first end of the signal connection sheet is provided with a bending structure, and the bending structure is inserted into the connection groove; the first end of the signal connection sheet is stacked and connected to the connection disk;

[0008] The current connection sheet is stacked and connected to the second end of the signal connection sheet.

[0009] Optionally, the signal connecting sheet is a nickel sheet.

[0010] Optionally, the hardness of the signal connecting sheet is 1 / 4H.

[0011] Optionally, the connection groove passes through the collecting plate along the thickness direction of the collecting plate.

[0012] Optionally, the bending structure is welded to the connecting groove; and / or,

[0013] The connection pad is a soldering pad, and the first end of the signal connection piece is soldered to the connection pad; and / or,

[0014] The current connecting piece is welded to the second end of the signal connecting piece.

[0015] Optionally, the connecting groove is a strip groove; the peripheral side of the bending structure and the groove wall of the connecting groove are welded by reflow soldering; and / or,

[0016] The first end of the signal connection sheet is soldered to the connection pad plane; and / or,

[0017] The second end planes of the current connecting piece and the signal connecting piece are laser welded.

[0018] Optionally, at least one through hole is provided on the connection pad, and a part of the solder between the signal connection sheet and the acquisition board is filled in the through hole.

[0019] Optionally, a copper layer is plated on at least one of the groove wall of the connecting groove, the connecting pad and the hole wall of the through hole.

[0020] Optionally, a concave-convex rebound structure is provided on the signal connection sheet, and the concave-convex rebound structure is located between the first end and the second end of the signal connection sheet.

[0021] Optionally, the concave-convex rebound structure is formed by partial bending of the signal connecting piece.

[0022] Optionally, the collection board is further provided with a vacant hole for positioning the collection board on the battery cell support; and / or,

[0023] The acquisition board is also provided with screw holes for fixing the acquisition board to the battery support.

[0024] In order to solve the problems existing in the prior art, the present invention also provides a battery, which includes any of the above-mentioned collection devices, and also includes a bracket and a battery cell arranged in the bracket, the collection board is fixed on the bracket, and the current connecting piece is connected to the battery cell.

[0025] Optionally, there are multiple battery cells, multiple current connecting pieces, and the current connecting pieces are connected to the battery cells in a one-to-one correspondence; there are multiple signal connecting pieces, and the signal connecting pieces are connected to the current connecting pieces in a one-to-one correspondence.

[0026] Optionally, the bracket includes a first bracket, a second bracket and an upper cover, the battery cell is arranged between the first bracket and the second bracket, and the upper cover covers the first bracket and the second bracket.

[0027] Compared with the prior art, the acquisition device provided by the embodiment of the present invention has the following beneficial effects: by designing an acquisition device, including an acquisition board, a signal connection board and a current connection sheet, a connection area is provided on the acquisition board, a connection groove and a connection disk are provided in the connection area, and the connection groove is located on the inner side of the connection disk; the signal connection sheet is fitted and connected to the connection disk, and a first end of the signal connection sheet is provided with a bending structure, and the bending structure is inserted into the connection groove; the first end of the signal connection sheet is stacked and connected to the connection disk; the current connection sheet is stacked and connected to the second end of the signal connection sheet; by providing a connection groove in the connection area of ​​the acquisition board and providing a bending structure at one end of the signal connection sheet, when the signal connection sheet is connected to the acquisition board, not only can one end of the signal connection sheet be fitted with the connection disk, but also the bending structure can be inserted and fixed to the connection groove, which effectively improves the stability of the connection, thereby improving the acquisition stability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, in which:

[0029] Figure 1 is a three-dimensional schematic diagram of a collection device provided by an embodiment of the present invention;

[0030] Figure 2 is a partial schematic diagram of a collection board provided in an embodiment of the present invention;

[0031] Figure 3 is a three-dimensional schematic diagram of a signal connection sheet provided by an embodiment of the present invention;

[0032] Figure 4 It is a three-dimensional schematic diagram of a battery provided by an embodiment of the present invention.

[0033] The reference numerals in the figures are:

[0034] 100, acquisition board; 200, signal connection sheet; 300, current connection sheet; 110, connection area; 120, vacant hole / screw hole; 111, connection plate; 112, connection groove; 1111, through hole; 210, bending structure; 220, concave-convex rebound structure. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, a preferred embodiment of the present invention is described in detail.

[0036] like Figures 1 to 3As shown, the present invention provides a specific embodiment of a collection device.

[0037] A collection device for collecting battery cell data, referring to Figures 1 to 3 The acquisition device includes an acquisition board 100, a signal connection sheet 200 and a current connection sheet 300. The acquisition board 100 is provided with a connection area 110, and the connection area 110 is provided with a connection groove 112 and a connection disk 111, and the connection groove 112 is located on the inner side of the connection disk 111; the signal connection sheet 200 is attached to the connection disk 111, and the first end of the signal connection sheet 200 is provided with a bending structure 210, and the bending structure 210 is inserted into the connection groove 112; the first end of the signal connection sheet 200 is stacked and connected to the connection disk 111; the current connection sheet 300 is stacked and connected to the second end of the signal connection sheet 200.

[0038] The acquisition device is used to collect the voltage and internal resistance of each battery cell in the battery. With the widespread application of electric vehicles and energy storage systems, the series and parallel design of power modules has become more and more common. In this context, the acquisition of the voltage and internal resistance of a single battery cell is crucial for the battery management system, because whether the voltage and internal resistance of a single battery cell are effectively monitored directly affects the feasibility of battery status monitoring, balancing management, thermal management and safety protection.

[0039] The acquisition board 100 is a PCBA board used for collecting battery cell data. The current connecting piece 300 is used to transmit current. The current connecting piece 300 is connected to the acquisition board 100 through the signal connecting piece 200 to achieve stable collection of the battery cell current. The connection reliability of the current connecting piece 300 is also crucial to the performance of the battery management system and the entire battery pack, and directly affects whether the voltage and internal resistance can be effectively monitored.

[0040] In the structure of the battery module, the signal connecting piece 200 is a bridge between the current connecting piece 300 and the acquisition board 100. The connection method between the signal connecting piece 200 and the acquisition board 100, the connection method between the signal connecting piece 200 and the current connecting piece 300, and the structural design of the signal connecting piece 200 itself can directly affect whether the battery BMS can effectively collect the voltage and internal resistance of a single battery cell.

[0041] Among them, the first end of the signal connecting piece 200 is provided with a bending structure 210, and the acquisition board 100 is provided with a connecting area 110 for connecting to the first end of the signal connecting piece 200 and a connecting groove 112 for connecting to the bending structure 210. When the signal connecting piece 200 is connected to the acquisition board 100, the bending structure 210 of the signal connecting piece 200 is first buckled into the connecting groove 112 on the acquisition board 100, and the first end of the signal connecting piece 200 is overlapped, attached and fixed to the connecting area 110 to increase the connection stability between the signal connecting piece 200 and the acquisition board 100.

[0042] The existing connection method between the current connecting piece 300, the signal connecting piece 200 and the acquisition board 100 is: the signal connecting piece 200 and the acquisition board 100 are connected using a planar patch process. The pull-out force and thrust force of the direct planar patch connection are small, and the direct planar patch is prone to cold soldering. The temperature during patching will produce a void rate, thereby affecting the pull-out force of the signal connecting piece 200 and the acquisition board 100 patch.

[0043] In this embodiment, a collection device is designed, including a collection board 100, a signal connection board and a current connection sheet 300. The collection board 100 is provided with a connection area 110, and the connection area 110 is provided with a connection groove 112 and a connection plate 111, and the connection groove 112 is located on the inner side of the connection plate 111; the signal connection sheet 200 is connected to the connection plate 111, and the first end of the signal connection sheet 200 is provided with a bending structure 210, and the bending structure 210 is inserted into the connection groove 112; the first end of the signal connection sheet 200 and the connection plate 111 are stacked and connected; the current connecting piece 300 is stacked and connected to the second end of the signal connecting piece 200; by providing a connecting groove 112 in the connecting area 110 of the acquisition board 100, and providing a bending structure 210 at one end of the signal connecting piece 200, when the signal connecting piece 200 is connected to the acquisition board 100, not only can one end of the signal connecting piece 200 be fitted with the connecting disk 111, but also the bending structure 210 can be inserted into and fixed to the connecting groove 112, which effectively improves the stability of the connection, thereby improving the acquisition stability and reliability.

[0044] In one of the embodiments, the signal connecting piece 200 is a nickel sheet. The positive and negative output poles of the large cylindrical battery cells and square battery cells used in existing electric vehicles, portable energy storage, home storage, and industrial and commercial storage are all aluminum poles or copper poles, that is, the current connecting piece 300 directly uses aluminum or copper. The acquisition board 100 is a PCBA board, which serves as a connecting bridge between the acquisition board 100 and the current connecting piece 300. If the signal connecting piece 200 is also made of copper, it is easy to deform seriously due to the soft copper material. Therefore, the signal connecting piece 200 of this embodiment uses a nickel sheet. This combination can realize automatic welding with high efficiency and stable quality.

[0045] In one of the embodiments, the hardness of the signal connection plate 200 is 1 / 4H, and the hardness is used as a single variable to perform mechanical tests such as drop, vibration, impact and collision on the battery pack. The test standard refers to the UN38.3 test standard. After the test, the battery pack is disassembled and analyzed. The soft state M is severely deformed and there are tears on the laser welds, and cracks appear at the 1 / 2H and H hardnesses. When the hardness of the signal connection plate 200 is 1 / 4H, its deformation is elastic deformation, and there is no tearing or cracking on the laser welds.

[0046] In one embodiment, reference Figure 1 The connection groove 112 penetrates the acquisition board 100 along the thickness direction of the acquisition board 100, and the bending part of the bending structure 210 of the signal connection sheet 200 is larger than the thickness of the acquisition board 100. When the bending structure 210 of the signal connection sheet 200 is buckled into the connection groove 112, the bending structure 210 can pass through the entire connection groove 112 for fixed connection, so as to increase the connection area between the bending structure 210 and the groove wall of the connection groove 112, thereby improving the connection stability between the signal connection sheet 200 and the acquisition board 100.

[0047] In one embodiment, the bending structure 210 is welded to the connecting groove 112; and / or, the connecting plate 111 is a welding pad, and the first end of the signal connecting plate 200 is welded to the connecting plate 111; and / or, the current connecting plate 300 is welded to the second end of the signal connecting plate 200.

[0048] Specifically, the connection groove 112 can be a strip groove. When the signal connection piece 200 is connected to the acquisition board 100, the bending structure 210 is buckled into the connection groove 112 and the peripheral side of the bending structure 210 is welded to the groove wall of the connection groove 112. The welding between the peripheral side of the bending structure 210 and the groove wall of the connection groove 112 can be performed by reflow soldering. Reflow soldering can simultaneously solder multiple solder joints, making the welding process more efficient. In mass production, it can effectively save time and cost. Moreover, reflow soldering can also provide consistent welding quality, ensuring that each solder joint can be accurately controlled in temperature and time, thereby reducing the possibility of welding defects. Moreover, the temperature and time during the reflow soldering process can be accurately and automatically controlled, further improving the welding efficiency.

[0049] Furthermore, the connecting pad 111 can be set as a soldering pad, and the first end of the signal connecting piece 200 is planarly soldered to the connecting pad 111. The planar soldering can provide a larger welding contact area, thereby achieving stronger connection strength, and the weld of the planar soldering is smoother and has a higher quality in appearance.

[0050] Furthermore, the current connecting piece 300 and the second end of the signal connecting piece 200 can be welded by planar laser welding. This welding method can achieve very fine welding, and the heat-affected zone during welding is small, so that the welding accuracy and welding quality are higher, and the laser welding speed is faster, which can improve the welding efficiency. Laser welding is non-contact welding, which avoids damage to the surface of the current connecting piece 300.

[0051] In one of the embodiments, at least one through hole 1111 is provided on the connection plate 111, and a portion of the solder between the signal connection plate 200 and the acquisition board 100 is filled in the through hole 1111; the number of through holes 1111 can be set according to actual needs. When the signal connection plate 200 is welded to the connection plate 111, the through hole 1111 on the connection plate can be tinned, thereby increasing the pulling force and pushing force between the connection plate 111 and the signal connection plate 200, thereby increasing the connection stability between the signal connection plate 200 and the acquisition board 100.

[0052] In one of the embodiments, at least one of the groove wall of the connecting groove 112, the connecting plate 111 and the hole wall of the through hole 1111 is plated with a copper layer. The copper plating can improve the electrical conductivity and thermal conductivity of the surface of the welding area, which helps to improve the heat transfer efficiency during the welding process. In addition, the plating can effectively prevent the oxidation of the surface of the acquisition board 100, reduce the impact of the oxide layer on the welding quality, and improve the welding quality. In addition, the copper plating can reduce pores and defects in the welding process, further improve the welding quality and welding stability. In addition, the copper plating can also increase the mechanical strength of the welding area and improve the mechanical properties of the welding area such as tensile strength.

[0053] In one embodiment, a concave-convex rebound structure 220 is disposed on the signal connection sheet 200 . The concave-convex rebound structure 220 is located between the first end and the second end of the signal connection sheet 200 , and the concave-convex rebound structure 220 is formed by a partial bending of the signal connection sheet 200 .

[0054] The existing signal connecting piece has no buffer design in the structural design and is a rigid connection. At present, the working conditions and practical environment of battery modules such as power and portable energy storage are extremely harsh and complex. Vibration, impact and falling conditions are all tests for the reliability of the connection. When these problems occur, relative movement is likely to occur between the acquisition board 100 and the current connecting piece 300. If a rigid connection is used, when the acquisition board 100 and the current connecting piece 300 move relative to each other, there is no buffer between the two, which can easily lead to connection failure, thereby affecting the voltage and internal resistance collection of a single battery cell, thereby affecting the status monitoring, balance management, safety protection and life of the voltage module.

[0055] In this embodiment, the rigid structure of the signal connecting piece 200 is optimized into a flexible structure, and a concave-convex rebound structure 220 is provided between the first end and the second end of the signal connecting piece 200, so that when the battery module is subjected to shocks such as vibration and falling, that is, when the acquisition board 100 and the current connecting piece 300 move relative to each other, the concave-convex rebound structure 220 of the signal connecting piece 200 can be elastically deformed, thereby increasing the reliability of the connection and improving the stability of the battery module; and by partially bending the signal connecting piece 200 to form the concave-convex rebound structure 220, the stability between the concave-convex rebound structure 220 and the signal connecting piece 200 can be improved.

[0056] In one embodiment, the collection board 100 is further provided with a vacant hole 120 for positioning the collection board 100 on the battery holder; and / or, the collection board 100 is further provided with a screw hole 120 for fixing the collection board 100 to the battery holder.

[0057] like Figure 4 As shown, the present invention also provides a specific embodiment of a battery.

[0058] A battery, reference Figure 4 , including the above-mentioned collection device 10, and also including a bracket and a battery cell arranged in the bracket, the collection board 100 is fixed on the bracket, and the current connecting piece 300 is connected to the battery cell.

[0059] Specifically, refer to Figure 1 and Figure 4 The battery includes two collection devices 10, which are respectively arranged at the two ends of the bracket along the direction of the battery cell to be connected to the two ends of the battery cell respectively. The bracket includes a first bracket 21, a second bracket 22 and an upper cover 23. The two collection devices are respectively arranged on the first bracket 21 and the second bracket 22, the battery cell is arranged between the first bracket 21 and the second bracket 22, and the upper cover 23 covers the first bracket 21 and the second bracket 22.

[0060] Among them, reference Figure 1 and Figure 4 There are multiple battery cells, multiple current connecting pieces 300, and multiple signal connecting pieces 200. The current connecting pieces 300 are connected to the battery cells one by one, and the signal connecting pieces 200 are connected to the current connecting pieces 300 one by one.

[0061] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the protection scope of the claims attached to the present invention.

Claims

1. A collection device for collecting battery cell data, characterized in that: include: A collection board, wherein a connection area is provided on the collection board, a connection groove and a connection disk are provided in the connection area, and the connection groove is located on the inner side of the connection disk; A signal connection sheet is attached to the connection plate, and a first end of the signal connection sheet is provided with a bending structure, and the bending structure is inserted into the connection groove; The first end of the signal connection sheet is stacked and connected to the connection pad; The current connection sheet is stacked and connected to the second end of the signal connection sheet.

2. The collection device according to claim 1, characterized in that: The signal connecting sheet is a nickel sheet.

3. The collection device according to claim 2, characterized in that: The hardness of the signal connecting piece is 1 / 4H.

4. The collection device according to claim 1, characterized in that: The connection groove passes through the collecting plate along the thickness direction of the collecting plate.

5. The collection device according to claim 1, characterized in that: The bending structure is welded to the connecting groove; and / or, The connection pad is a soldering pad, and the first end of the signal connection piece is soldered to the connection pad; and / or, The current connecting piece is welded to the second end of the signal connecting piece.

6. The collection device according to claim 5, characterized in that: The connecting groove is a strip groove; the peripheral side of the bending structure and the groove wall of the connecting groove are welded by reflow soldering; and / or, The first end of the signal connection sheet is soldered to the connection pad plane; and / or, The second end planes of the current connecting piece and the signal connecting piece are laser welded.

7. The collection device according to claim 5, characterized in that: The connection plate is provided with at least one through hole, and a part of the solder between the signal connection sheet and the acquisition board is filled in the through hole.

8. The collection device according to claim 7, characterized in that: A copper layer is plated on at least one of the groove wall of the connecting groove, the connecting pad and the hole wall of the through hole.

9. The collection device according to any one of claims 1 to 8, characterized in that: The signal connection sheet is provided with a concave-convex rebound structure, and the concave-convex rebound structure is located between the first end and the second end of the signal connection sheet.

10. The collection device according to claim 9, characterized in that: The concave-convex rebound structure is formed by partial bending of the signal connecting piece.

11. The collection device according to claim 1, characterized in that: The acquisition board is also provided with a vacant hole for positioning the acquisition board on the battery support; and / or, The acquisition board is also provided with screw holes for fixing the acquisition board to the battery support.

12. A battery, characterized in that: It comprises the collection device as described in any one of claims 1 to 11, and also comprises a bracket and a battery cell arranged in the bracket, the collection board is fixed on the bracket, and the current connecting piece is connected to the battery cell.

13. The battery according to claim 12, characterized in that There are multiple battery cells, there are multiple current connection sheets, and the current connection sheets are connected to the battery cells in a one-to-one correspondence; there are multiple signal connection sheets, and the signal connection sheets are connected to the current connection sheets in a one-to-one correspondence.

14. The battery according to claim 12, characterized in that The bracket comprises a first bracket, a second bracket and an upper cover, the battery cell is arranged between the first bracket and the second bracket, and the upper cover covers the first bracket and the second bracket.

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