A composite PCB for an energy storage battery module with overcurrent protection and current collection.

Abstract

This invention provides a composite PCB for an energy storage battery module with integrated overcurrent protection and current collection, comprising an FR-4 substrate and a copper plate, the copper plate being bonded to the FR-4 substrate. The FR-4 substrate has multiple locking holes, arranged in groups of two, in multiple rows. Each group of locking holes is fitted with a fuse structure in series and parallel, and the multiple fuse structures surround the outer periphery of the copper plate. The copper plate has elongated sections, with multiple current collection nodes protruding at intervals on both the inner and outer sides of the sections, each current collection node located between two adjacent locking holes. The composite PCB for an energy storage battery module of this invention has a simple structure, good electrical performance, and low manufacturing cost.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle component technology, and in particular to a PCB for an energy storage battery module. Background Technology

[0002] Existing energy storage module PCBs are generally made of copper or aluminum substrates pressed with FR-4 and other materials to form a three- or multi-layer structure (made by mixing FR-4 substrate and substrate). Specifically, the process involves punching inlay holes on the copper substrate and aluminum substrate, then embedding an insulating substrate flush with the surface of the aluminum substrate into the inlay holes to form a composite substrate. Next, semi-dry adhesive and conductive copper plates for conduction are applied to the surface of the composite substrate from the inside out, and constant pressure and temperature are applied to cure the semi-dry adhesive to form an insulating layer, thereby forming a composite PCB board.

[0003] However, this traditional composite PCB manufacturing process is cumbersome, costly, and has poor market benefits. Summary of the Invention

[0004] This invention provides a composite PCB for an energy storage battery module with fuse overcurrent and current collection, which has low manufacturing cost, effectively improves electrical performance, and has great market application value.

[0005] The technical solution adopted in this invention is: a composite PCB for an energy storage battery module with overcurrent protection and current collection, comprising: an FR-4 substrate and a copper plate; the copper plate is pasted on the FR-4 substrate;

[0006] The FR-4 substrate has multiple locking holes, with two locking holes forming a group, arranged in multiple rows on the FR-4 substrate. Each group of locking holes is connected in series and parallel to a fuse structure, and multiple fuse structures surround the outer periphery of the copper plate.

[0007] The copper plate has a long strip-shaped plate, and multiple converging nodes are protruding at intervals on both the inner and outer sides of the plate. Each converging node is located between two adjacent lock holes.

[0008] Furthermore, the fuse structure has a width of 1.8mm, a rectangular shape, and is not covered with green oil.

[0009] Furthermore, the fuse structure is copper foil + copper plating.

[0010] Furthermore, the copper foil thickness is 18μm, and the copper plating thickness is 18μm-20μm.

[0011] Furthermore, the fuse structure has a width of 2.0 mm, a rectangular shape, and is covered by 1 / 2 of the green oil.

[0012] Furthermore, a protrusion is provided on the outward-facing side of the plate for connecting the serial-parallel module connecting block.

[0013] Furthermore, the plate has multiple ventilation holes, and the protrusion has serial and parallel mounting holes for battery cells.

[0014] The present invention further provides the following technical solution: a composite PCB for an energy storage battery module with overcurrent protection and current collection, comprising: an FR-4 substrate, an upper copper plate, a lower copper plate, a solder paste layer, a current bus layer, and a combined layer; the upper copper plate is disposed on the upper surface of the FR-4 substrate, and the lower copper plate is disposed on the lower surface of the FR-4 substrate; the solder paste layer is bonded to the upper copper plate, the current bus layer is bonded to the solder paste layer, and the combined layer is disposed on the current bus layer.

[0015] This invention also provides the following technical solution: a method for manufacturing a composite PCB for an energy storage battery module with overcurrent protection and current collection, comprising the following steps:

[0016] S1: An upper copper plate and a lower copper plate are respectively disposed on the upper and lower surfaces of the FR-4 substrate and holes are drilled.

[0017] S2: Adhere a layer of tin adhesive to the upper copper plate;

[0018] S3: The bus layer is bonded to the solder paste layer by heating;

[0019] S4: Set up a combination layer on the bus layer.

[0020] Furthermore, in S1, an upper series battery cell is provided on the upper copper plate, and a lower series battery cell is provided on the lower copper plate. The lower series battery cell is conducted to the upper copper plate through the FR-4 substrate to latch the upper series battery cell, and then merged by the bus layer to the combination layer for lower assembly or output.

[0021] Compared to existing technologies, the energy storage battery module composite PCB of the present invention effectively solves the protection and overcurrent of the positive and negative electrodes of the battery module by series-parallel locking multiple fuse structures on the FR-4 substrate and setting the bus node on the copper plate, thereby improving the electrical performance of the composite PCB, simplifying the structure of the composite PCB, and reducing manufacturing costs. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but should not be construed as limiting the invention. In the drawings,

[0023] Figure 1 : A perspective view of the composite PCB of the energy storage battery module with fuse overcurrent and current collection and collection functions of the present invention;

[0024] Figure 2 : A partial schematic diagram of the composite PCB of the energy storage battery module with fuse overcurrent and current collection and collection functions of the present invention;

[0025] Figure 3 : A schematic diagram of the composite PCB structure of the energy storage battery module with fuse overcurrent and current collection and collection functions of the present invention; Detailed Implementation

[0026] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0027] Example 1

[0028] like Figure 1 and Figure 2 As shown, the energy storage battery module composite PCB with overcurrent protection and current collection of the present invention includes an FR-4 substrate 1 and a copper plate 2; wherein, the copper plate 2 is bonded to the FR-4 substrate 1 by means of a surface mount process; the FR-4 substrate 1 can be a double-sided or single-sided FR-4 board.

[0029] Furthermore, the FR-4 substrate 1 has multiple locking holes 3, arranged in groups of two, and arranged in multiple rows on the FR-4 substrate 1. Each locking hole 3 is φ4.2mm. Each group of locking holes 3 is connected in series and parallel to a fuse structure 4, and multiple fuse structures 4 surround the outer periphery of the copper plate 2. The fuse structure 4 is 1.8mm wide, rectangular in shape, and does not cover with solder mask (this structure is suitable for general battery modules); the fuse structure 4 is a copper foil + copper plating structure, with a copper foil thickness of 18μm and a copper plating thickness of 18μm-20μm. It is understood that in other embodiments, the fuse structure 4 can also be set to be 2.0mm wide, rectangular in shape, and covered with 1 / 2 solder mask (this structure is only suitable for 350A fast charging battery modules), and is not limited thereto.

[0030] The copper plate 2 has a long strip-shaped plate 5. A protrusion 6 is provided on the outward-facing side of the plate 5 to connect a serial-parallel module connecting block 7, which connects to another composite PCB. Multiple busbar nodes 8 are spaced apart on both the inner and outer sides of the plate 5. Each busbar node 8 is located between two adjacent lock holes 3, and each fuse structure 4 corresponds to one busbar node 8. Furthermore, multiple ventilation holes 9 are provided on the plate 5, serial-parallel mounting holes 10 for battery cells are provided on the protrusion 6, and multiple upper and lower layer through holes 11 are provided on the FR-4 substrate 1, with these through holes 11 located on the outer periphery of the copper plate 2.

[0031] The energy storage battery module composite PCB of the present invention with fuse overcurrent and current collection and collection firstly uses the cell series-parallel mounting holes 10 to lock the cells in series and parallel. Each cell flows through the corresponding fuse structure 4 and then flows to each current collection node 8, and then merges into the copper plate 2. Finally, it is connected to the next module or output through the series-parallel module connecting block 7.

[0032] Example 2

[0033] like Figure 3 As shown, the composite PCB of the energy storage battery module with fuse overcurrent and current collection of the present invention includes an FR-4 substrate 1, an upper copper plate 11, a lower copper plate 12, a solder paste layer 13, a busbar layer 14, and a combination layer 15. The upper copper plate 11 is disposed on the upper surface of the FR-4 substrate 1, and the lower copper plate 12 is disposed on the lower surface of the FR-4 substrate 1. The solder paste layer 13 is bonded to the upper copper plate 11, the busbar layer 14 is bonded to the solder paste layer 13, and the combination layer 15 is disposed on the busbar layer 14.

[0034] The fabrication steps of the composite PCB for the energy storage battery module with fuse overcurrent protection and current collection and merging of the present invention are as follows:

[0035] S1: An upper copper plate 11 and a lower copper plate 12 are respectively disposed on the upper and lower surfaces of the FR-4 substrate 1 and holes are drilled therein;

[0036] S2: Adhere the tin adhesive layer 13 onto the upper copper plate 11;

[0037] S3: By heating, the bus layer 14 is bonded to the solder paste layer 13;

[0038] S4: Set up a combination layer 15 on the bus layer 14.

[0039] In S1, an upper series of batteries is provided on the upper copper plate 11, and a lower series of batteries is provided on the lower copper plate 12. The lower series of batteries are conducted to the upper copper plate 11 through the FR-4 substrate 1 to latch the upper series of batteries, and are then combined by the bus layer 14 to the combination layer 15 for lower assembly or output.

[0040] In summary, the energy storage battery module composite PCB with fuse overcurrent and current collection of the present invention effectively solves the protection and overcurrent of the positive and negative poles of the battery module by series-parallel locking of multiple fuse structures 4 on the FR-4 substrate 1 and setting current collection nodes 8 on the copper plate 2, thereby improving the electrical performance of the composite PCB, simplifying the structure of the composite PCB, and reducing manufacturing costs.

[0041] Any combination of various embodiments of the present invention, provided it does not violate the inventive concept of the present invention, shall be regarded as the content disclosed by the present invention; within the scope of the technical concept of the present invention, any simple modifications to the technical solution and any combination of different embodiments that do not violate the inventive concept of the present invention shall be within the protection scope of the present invention.

Claims

1. A composite PCB for an energy storage battery module with overcurrent protection and current collection / contraction, characterized in that, include: An FR-4 substrate and a copper plate; the copper plate is bonded to the FR-4 substrate. The FR-4 substrate has multiple locking holes, with two locking holes forming a group, arranged in multiple rows on the FR-4 substrate. Each group of locking holes is connected in series and parallel to a fuse structure, and multiple fuse structures surround the outer periphery of the copper plate. The copper plate has a long strip-shaped plate, and multiple converging nodes are protruding at intervals on both the inner and outer sides of the plate. Each converging node is located between two adjacent lock holes. The outward-facing side of the plate has a protrusion for connecting the serial-parallel module connecting block; The plate has multiple ventilation holes, and the protrusion has battery cell series and parallel mounting holes. The composite PCB of the energy storage battery module first uses the cell series and parallel mounting holes to lock the cells in series and parallel. Each cell flows through the corresponding fuse structure to each bus node after passing through it, and then they are combined on the copper plate. Finally, they are connected to the next module or output through the series and parallel module connecting block.

2. The composite PCB for an energy storage battery module with overcurrent protection and current collection as described in claim 1, characterized in that: The fuse structure is 1.8mm wide, rectangular in shape, and not covered with green varnish.

3. The composite PCB for an energy storage battery module with overcurrent protection and current collection as described in claim 1, characterized in that: The fuse structure is copper foil + copper plating.

4. The composite PCB for an energy storage battery module with overcurrent protection and current collection as described in claim 3, characterized in that: The copper foil has a thickness of 18 μm, and the copper plating thickness is 18 μm-20 μm.

5. The composite PCB for an energy storage battery module with overcurrent protection and current collection as described in claim 1, characterized in that: The fuse structure is 2.0 mm wide, rectangular in shape, and covered with 1 / 2 of the green oil.

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