Power battery assembly structure with battery cell sampling plate hot plug protection

Abstract

The utility model provides a power battery assembly structure with battery cell sampling plate hot plug protection, ICB is provided with buckles which are the same as nickel sheets in number and correspond to the nickel sheets in position, the buckles are arranged at the positions, close to the nickel sheets, of the palladium sheets, each buckle is of a rectangular block structure, and one side, close to the nickel sheets, of each buckle is provided with a slot for inserting the nickel sheets; a notch is formed in the middle of the side, close to the nickel sheet, of the rectangular opening. The nickel sheet is fixed and lifted through the buckle, electrical connection between the nickel sheet and the palladium sheet is avoided, and reliable pressing of the nickel sheet copper column needle bed tool is guaranteed by combining limiting of the FPC end limiting hole.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle battery management systems, and in particular to a power battery assembly structure with hot-swap protection for a battery cell sampling plate. Background Art

[0002] like Figure 1 As shown in the figure, the current mainstream power battery assembly process mainly includes battery cell installation, ICB (Interconnectboard) installation, FPC (Flexible Printed Circuit) installation, PCBA (Printed Circuit Board Assembly) installation and other links.

[0003] By laser welding the palladium sheet and the battery pole, the positive and negative poles of the adjacent battery cells are short-circuited to achieve independent battery cell series connection; the FPC is laser welded with the nickel sheet and the palladium sheet to transmit the signal of each battery cell to the PCBA; the ICB is used as a palladium sheet, FPC and PCBA support plate, and a high insulation resistance plastic fixing frame is used to achieve electrical isolation. Among them, in order to ensure the reliability of laser welding of palladium sheets and nickel sheets, it is necessary to add a tooling pressing link in the front process. Generally, a copper column needle bed is used to press the palladium sheet with the battery pole and the nickel sheet with the palladium sheet.

[0004] After the FPC installation is completed, the FPC connector end is connected in series with high voltage (with Figure 1 For example, the voltage of a single battery cell is 3.2V, and the voltage of 8 battery cells in series reaches 25.6V). The high voltage generated in the post-PCBA assembly process increases the risk of hot-swap failure. In addition, to avoid unreliable nickel sheet welding, the nickel sheet will be glued after laser welding to reduce the production cycle and increase production costs. Summary of the invention

[0005] In order to solve the above problems, the present invention discloses a power battery assembly structure with hot-swap protection for a cell sampling board, which optimizes the formation of high voltage in series connection of cells before the PCBA assembly link, thereby reducing the risk of hot-swap failure; at the same time, it cuts out the production links and reduces production costs.

[0006] The specific plan is as follows:

[0007] A power battery assembly structure with hot-swap protection for a battery sampling plate, comprising a battery cell and an ICB, wherein the battery cells are multiple and evenly arranged, and battery cell poles are respectively provided at both ends, and the two battery cell poles are respectively the positive pole and the negative pole of the battery cell, the ICB covers the battery cell, and the ICB is equipped with a palladium sheet, an FPC and a PCBA, the palladium sheet is placed at the positive pole and the negative pole of the battery cell, the FPC is provided with a plurality of nickel sheets, the number of the nickel sheets is the same as that of the palladium sheets and the positions correspond, the PCBA is connected to the FPC, and is characterized in that: the ICB is provided with buckles that are the same as the number of nickel sheets and the positions correspond, the buckles are placed on the palladium sheet near the nickel sheet, the buckles are rectangular block structures, a slot for inserting the nickel sheet is provided on the side close to the nickel sheet, a rectangular opening connected to the slot is provided in the middle of the top surface, and a notch is provided in the middle of the side close to the nickel sheet of the rectangular opening.

[0008] Furthermore, a plurality of limiting posts are arranged at positions on the ICB corresponding to the positions on the FPC. A plurality of limiting holes are opened on the FPC, and the number of the limiting holes is the same as that of the limiting posts and the positions are corresponding.

[0009] The beneficial effects of the present invention are as follows: the nickel sheet is fixed and raised by a buckle to avoid electrical connection between the nickel sheet and the palladium sheet, and the positioning of the limiting hole at the FPC end is combined to ensure reliable pressing of the nickel sheet copper column needle bed tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is an assembly flow chart of mainstream power batteries in the prior art.

[0011] Figure 2 It is a schematic diagram of the assembly of the improved ICB nickel sheet buckle and FPC limiting hole in the present invention.

[0012] Figure 3 These are the front view and top view of the buckle on the ICB in the present invention, where a is the front view and b is the top view.

[0013] Figure 4 This is a flow chart of the power battery assembly of the present invention.

[0014] List of reference numerals:

[0015] 1-battery cell, 2-battery cell column, 3-ICB, 4-palladium sheet, 5-FPC, 6-nickel sheet, 7-PCBA, 8-clip, 9-limiting hole. DETAILED DESCRIPTION

[0016] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0017] As shown in the figure, the present invention provides a power battery assembly structure with hot-swap protection for a battery sampling board, comprising a battery cell (1) and an ICB (3), wherein the battery cells are multiple and evenly arranged, and battery cell poles (2) are respectively provided at both ends thereof, and the two battery cell poles are respectively a positive electrode and a negative electrode of the battery cell, the ICB covers the battery cell, and the ICB is equipped with a palladium sheet (4), an FPC (5) and a PCBA (7), the palladium sheet is placed at the positive electrode and the negative electrode of the battery cell, the FPC is provided with a plurality of nickel sheets (6), the number of the nickel sheets and the palladium sheets are the same and the positions are corresponding, and the PCBA is connected to the FPC.

[0018] In this embodiment, the ICB is provided with buckles (8) having the same number as the nickel sheets and corresponding positions, and the buckles are placed on the palladium sheet near the nickel sheet. The buckles are rectangular block structures, and a slot for inserting the nickel sheet is provided on the side close to the nickel sheet, and a rectangular opening connected to the slot is provided in the middle of the top surface, and a notch is provided in the middle of the side close to the nickel sheet. The nickel sheet is fixed and raised by the buckles to avoid electrical connection between the nickel sheet and the palladium sheet, and the nickel sheet copper column needle bed tooling is ensured to be reliably pressed in combination with the limiting hole at the FPC end.

[0019] In this embodiment, a plurality of limiting posts are provided at positions corresponding to the FPC on the ICB. A plurality of limiting holes (9) are provided on the FPC, and the number of the limiting holes is the same as that of the limiting posts and the positions thereof correspond.

[0020] The present invention adjusts the PCBA assembly link to the ICB installation link. The copper column needle bed presses down the corresponding palladium sheet and nickel sheet at the battery cell pole end in sequence from low to high according to the battery cell voltage, and the palladium sheet and nickel sheet are welded and integrated into the same link for laser welding. The overall assembly process is as follows: battery component cleaning → battery cell installation, module integration → nickel sheet inserted into the card slot → FPC fit limit hole → PCBA installation → ⑥ copper column needle bed presses nickel sheet and palladium sheet one by one → laser welding tooling welds nickel sheet, palladium sheet and battery cell pole one by one.

[0021] From the formula i=C*du / dt, we can see that when the PCBA port capacitance is the same, the smaller the slope of the voltage change relative to time, the smaller the port injection current, and the correspondingly lower the risk of hot plug failure.

[0022] The effects of the present invention are: 1. In the ICB installation link, due to the nickel sheet buckle design, there is no electrical connection between the PCBA and the battery cell. 2. In the installation link of the palladium sheet and the nickel sheet, the copper column needle bed is crimped in the order of "battery cell 1" to "battery cell 8" to achieve PCBA step power-on, reduce the power-on voltage U, extend the power-on time t, greatly reduce the injection current, and reduce the risk of hot plug failure. 3. The palladium sheet and nickel sheet welding are integrated in the same link to improve production efficiency. 4. Through the design of ICB buckles and FPC limit holes, the stability of nickel sheet fixation is increased, the glue fixation link is deleted, and the production efficiency is improved.

[0023] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A power battery assembly structure with hot-swap protection for a cell sampling board, comprising a cell and an ICB, wherein the cell has multiple cells and is evenly arranged, and the two ends thereof are provided with cell poles, and the two cell poles are respectively the positive electrode and the negative electrode of the cell, the ICB covers the cell, and the ICB is equipped with a palladium sheet, an FPC and a PCBA, the palladium sheet is placed at the positive electrode and the negative electrode of the cell, the FPC is provided with multiple nickel sheets, the number of the nickel sheets and the palladium sheets are the same and the positions are corresponding, the PCBA is connected to the FPC, and is characterized in that: The ICB is provided with clips with the same number and corresponding positions as the nickel sheets. The clips are placed on the palladium sheet near the nickel sheet. The clips are rectangular block structures, and a slot for inserting the nickel sheet is provided on the side close to the nickel sheet. A rectangular opening connected to the slot is provided in the middle of the top surface, and a notch is provided in the middle of the side of the rectangular opening close to the nickel sheet.

2. A power battery assembly structure with hot-swap protection for a cell sampling board according to claim 1, characterized in that: A plurality of limiting posts are arranged at positions on the ICB corresponding to the FPC.

3. A power battery assembly structure with hot-swap protection for a cell sampling board according to claim 2, characterized in that: The FPC is provided with a plurality of limiting holes, and the number of the limiting holes is the same as that of the limiting posts and the positions thereof correspond.

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