PCM assembly structure, individual cells and battery pack

Abstract

This application relates to the field of lithium battery technology, and in particular to a PCM assembly structure, a single cell, and a battery pack. The PCM assembly structure includes a PCB, a first conductive sheet, and a second conductive sheet. The PCB is located at the first end of the cell, and a through hole is formed on the PCB at a position opposite to the first electrode at the first end of the cell. The first conductive sheet is located on the side of the PCB facing the cell, covering the through hole, and the first conductive sheet is in contact with the first electrode, so that the first electrode and the first conductive sheet can be welded through the through hole. Then, one end of the second conductive sheet is welded to the second electrode at the second end of the cell, and the other end is welded to the side of the PCB away from the cell, completing the electrical connection assembly between the PCM and the cell. The PCB does not require a support bracket, thereby reducing the space required in the length direction of the cell and improving the battery energy density and space utilization. At the same time, the welding process can be automated, improving production efficiency.

Description

Technical Field

[0001] This application relates to the field of lithium battery technology, and in particular to a PCM assembly structure, a single cell, and a battery pack. Background Technology

[0002] The assembly and connection of battery cells to the PCM (Protection Circuit Module) is a crucial step in the battery manufacturing process, with the core being the electrical connection between the positive and negative terminals of the battery cell and the PCM's PCB (Printed Circuit Board). Currently, this connection method still primarily relies on wires, and the PCB usually requires brackets for fixation. This type of connection not only demands significant assembly space, limiting the overall space utilization of the battery structure, but also relies mainly on manual soldering for the connection between wires and the positive and negative terminals of the battery cell and the PCB, making it difficult to adapt to automated production processes. Utility Model Content

[0003] The purpose of this invention is to provide a PCM assembly structure, a single cell and a battery pack, so as to reduce the space required for PCM assembly to a certain extent, improve space utilization, and enable automated production.

[0004] The first aspect of this utility model provides a PCM assembly structure, including a PCM, a first conductive sheet, and a second conductive sheet;

[0005] The PCB of the PCM has through holes. The first conductive sheet is electrically connected to one side of the PCB and covers the through holes. The PCB is used to place the first end of the battery cell, so that the first conductive sheet faces the battery cell and is in contact with the first electrode of the first end of the battery cell. The first conductive sheet is welded to the first electrode of the battery cell through the through holes so that the first conductive sheet is electrically connected to the first electrode.

[0006] One end of the second conductive sheet is soldered to the surface of the PCB facing away from the battery cell, so that the second conductive sheet is electrically connected to the PCB. The other end of the second conductive sheet is soldered to the second electrode at the second end of the battery cell, so that the second conductive sheet is electrically connected to the second electrode.

[0007] Furthermore, the first conductive sheet is fixed to the PCB by means of a patch.

[0008] Furthermore, a contact plate is provided on the surface of the PCB facing away from the battery cell, and the PCB is soldered to the second conductive sheet through the contact plate.

[0009] Furthermore, the PCB has a pad on the side of its surface facing away from the battery cell, and the second conductive sheet is soldered to the pad by means of soldering or thermoforming.

[0010] Furthermore, the PCM assembly structure also includes an insulating first adhesive tape;

[0011] The PCB is bonded to the end of the first end of the battery cell by the first adhesive tape, and the first adhesive tape is ring-shaped, so that the first adhesive tape surrounds the first conductive sheet and the first electrode.

[0012] Furthermore, the PCM assembly structure also includes an insulating second adhesive tape, which covers and adheres to the side of the PCB facing away from the battery cell.

[0013] Furthermore, the PCM assembly structure also includes an insulating third adhesive tape that covers the end of the second end of the battery cell.

[0014] Furthermore, the second conductive sheet has a welding connection portion at one end for connecting to the second electrode. The welding connection portion is adapted to fit and welded to the second electrode, and the welding connection portion has a diversion hole.

[0015] A second aspect of this utility model provides a single-cell battery, including the PCM assembly structure described in any of the above claims.

[0016] A third aspect of this utility model provides a battery pack comprising the aforementioned individual battery cells.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] The PCM assembly structure provided by this utility model includes a PCB, a first conductive sheet and a second conductive sheet. The battery cell assembled with the PCM has a first end and a second end opposite to each other in its own length direction. The first end of the battery cell is provided with a first electrode (such as a positive electrode), and the second end of the battery cell is provided with a second electrode (such as a negative electrode). A PCB is used to mount the first end of the battery cell. A through-hole is formed on the PCB opposite the first electrode of the battery cell. A first conductive sheet is mounted on the side of the PCB facing the battery cell and covers the through-hole, allowing the first conductive sheet to face and abut the first electrode. Simultaneously, the area of ​​the first conductive sheet opposite the first electrode is exposed within the through-hole, enabling soldering between the first electrode and the first conductive sheet to achieve electrical connection between the first electrode and the PCB. After completing the electrical connection between the PCB and the first electrode, one end of a second conductive sheet is soldered to the second electrode at the second end of the battery cell, and the other end is soldered to the side of the PCB facing away from the battery cell, completing the electrical connection between the second electrode and the PCB. This completes the electrical connection assembly between the PCM and the battery cell. Furthermore, the PCB does not require a support bracket at the first end of the battery cell, effectively reducing the space required for PCM assembly along the length of the battery cell, thereby improving battery energy density and space utilization to some extent. Simultaneously, the soldering between the first conductive sheet and the first electrode, and the soldering between the second conductive sheet and the PCB and the second electrode, can be automated, eliminating the need for manual soldering and effectively improving production efficiency.

[0019] This utility model also provides a single battery cell and a battery pack including the single battery cell. Since the single battery cell includes the PCM assembly structure, the single battery cell and the battery pack also have the beneficial effects of the PCM assembly structure. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the split structure of the PCM assembly structure is provided for embodiments of this utility model;

[0022] Figure 2 A cross-sectional view of the PCM assembly structure at the first end of the battery cell provided in an embodiment of this utility model.

[0023] Figure label:

[0024] 1-Battery cell, 11-First electrode, 2-PCB, 21-Butterfly contact, 22-Through hole, 3-First conductive sheet, 4-Second conductive sheet, 41-Welding connection, 42-Diverter hole, 5-First adhesive tape, 6-Second adhesive tape, 7-Third adhesive tape. Detailed Implementation

[0025] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0026] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0027] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] The following reference Figure 1 and Figure 2 This application describes a PCM assembly structure, a single cell, and a battery pack according to some embodiments.

[0031] The first aspect of this application provides a PCM assembly structure for assembling a PCM with a battery cell.

[0032] like Figure 1 and Figure 2 As shown, the PCM assembly structure includes a PCB2, a first conductive sheet 3, and a second conductive sheet 4. The battery cell 1 assembled with the PCM has a first end and a second end opposite to each other along its length. The first end of the battery cell 1 is provided with a first electrode 11 (e.g., a positive electrode), and the second end of the battery cell 1 is provided with a second electrode (e.g., a negative electrode). The PCB2 is disposed at the first end of the battery cell 1, and a through hole 22 is provided at the position opposite to the first electrode 11 of the battery cell 1 on the PCB2. The first conductive sheet 3 (e.g., a nickel sheet) is disposed on the side of the PCB2 facing the battery cell 1 and covers the through hole 22, allowing the first conductive sheet 3 to be opposite and abut against the first electrode 11. Simultaneously, the area of ​​the first conductive sheet 3 opposite to the first electrode 11 is exposed within the through hole 22, allowing the first electrode 11 and the first conductive sheet 3 to be soldered through the through hole 22, thus achieving electrical connection between the first electrode 11 and the PCB2. After completing the electrical connection between the PCB2 and the first electrode 11, the second conductive sheet 4 (e.g., a long strip) is then installed. One end of the sheet nickel strip is welded to the second electrode at the second end of the cell 1, and the other end is welded to the side of the PCB2 facing away from the cell 1 to complete the electrical connection between the second electrode and the PCB2. This completes the electrical connection assembly between the PCM and the cell 1. Furthermore, the PCB2 does not require a support bracket at the first end of the cell 1, which can effectively reduce the space required for the PCM assembly along the length of the cell 1, thereby improving the battery energy density and space utilization to a certain extent. At the same time, the welding between the first conductive sheet 3 and the first electrode 11, and the welding between the second conductive sheet 4 and the second electrode on the PCB2 can be automated, eliminating the need for manual welding and effectively improving production efficiency.

[0033] In this embodiment, the through hole 22 can be a round hole or a square hole, as long as it can expose the welding area between the first conductive sheet 3 and the first electrode 11, so that the first conductive sheet 3 and the first electrode 11 can be welded through the through hole 22, such as by laser spot welding.

[0034] In this embodiment, preferably, a first shunt hole is provided on the first conductive sheet 3. The first shunt hole is elongated to ensure that the current is consistent when the first conductive sheet 3 is welded to the first electrode 11, so as to ensure the reliability of the welding and prevent the occurrence of incomplete connections.

[0035] In one embodiment of this application, preferably, the first conductive sheet 3 is fixed to the PCB2 by means of surface mount technology (SMT) to achieve the fixed connection and electrical connection of the first conductive sheet 3 on the PCB2, thereby realizing the electrical connection between the first electrode 11 and the PCB2 through the electrical connection between the first conductive sheet 3 and the first electrode 11.

[0036] Regarding the welding of the second conductive sheet 4 to the PCB2, in one embodiment of this application, preferably, a contact piece 21 is provided on the surface of the PCB2 facing away from the battery cell 1. Specifically, the contact piece 21 is provided near the edge of the PCB2. The PCB2 is welded to the second conductive sheet 4 through the contact piece 21 to achieve a fixed connection and electrical connection between the PCB2 and the second conductive sheet 4. Compared with the method of achieving electrical connection through wires, this can effectively achieve miniaturization and integration, and at the same time, it can achieve automated welding to improve production efficiency and connection reliability.

[0037] Regarding the welding of the second conductive sheet 4 to the PCB2, in one embodiment of this application, preferably, a solder pad is provided on the surface of the PCB2 facing away from the battery cell 1. Specifically, the solder pad is provided near the edge of the PCB2, so that the second conductive sheet 4 can be welded to the PCB2 by means of solder stacking or thermoforming, so as to realize the fixed connection and electrical connection between the second conductive sheet 4 and the PCB2, effectively ensure the connection strength between the second conductive sheet 4 and the PCB2, reduce the risk of failure, and realize automated welding to improve production efficiency.

[0038] In one embodiment of this application, preferably, as Figure 1 As shown, the PCM assembly structure also includes an insulating first adhesive tape 5. The first adhesive tape 5 is disposed between the end faces of the PCB2 and the first end of the battery cell 1. One side of the first adhesive tape 5 is bonded to the end face of the first end of the battery cell 1, and the other side of the first adhesive tape 5 is soldered to the PCB2. The first adhesive tape 5 is annular, surrounding the outside of the first electrode 11 and the first conductive sheet 3. Thus, the insulating first adhesive tape 5 can achieve insulation isolation between the PCB2 and the battery cell 1, avoiding the risk of short circuits. It also serves as a pre-fixing and assembly aid between the PCB2 and the battery cell 1. Furthermore, the first adhesive tape 5 can fill the gap between the end faces of the PCB2 and the first end of the battery cell 1, making the PCB2 and the battery cell 1 fit more tightly.

[0039] In one embodiment of this application, preferably, as Figure 1 As shown, the PCM assembly structure also includes an insulating second adhesive tape 6. After the second conductive sheet 4 is soldered to the PCB2, the second adhesive tape 6 is bonded to the PCB2 to cover the side of the PCB2 facing away from the battery cell 1, thereby isolating external conductive interference and avoiding the risk of short circuit. At the same time, the second adhesive tape 6 can also protect the electronic components on the PCB2 to form a buffer protective layer to prevent electronic components from falling off, pins from breaking, or solder joints from being damaged.

[0040] In one embodiment of this application, preferably, as Figure 1As shown, the PCM assembly structure also includes an insulating third adhesive tape 7. After the second conductive sheet 4 is welded to the second electrode of the cell 1, the third adhesive tape 7 is adhered to the end face of the second end of the cell 1 to cover the end of the second end of the cell 1, and also to cover the welding area between the second conductive sheet 4 and the second electrode. This allows the second adhesive tape 6 to isolate external conductive interference and avoid the risk of short circuit; it can also protect the stability of the connection between the second conductive sheet 4 and the second electrode to a certain extent.

[0041] In one embodiment of this application, preferably, as Figure 1 As shown, the second conductive sheet 4 has a welding connection portion 41 at one end for electrical connection with the second electrode. The welding connection portion 41 can be fitted together with the second electrode to form a welding connection, thereby realizing the electrical connection between the second conductive sheet 4 and the second electrode. At the same time, a flow diversion hole 42 is provided on the welding connection portion 41. Preferably, the flow diversion hole 42 is elongated to ensure that the spot welding current is consistent when welding the welding connection portion 41 and the second electrode, so as to ensure the reliability of the welding and prevent the occurrence of incomplete connections.

[0042] A second aspect of this application provides a single-cell battery including the PCM assembly structure of any of the above embodiments.

[0043] In this embodiment, the single cell includes a PCM assembly structure, and therefore the single cell has all the beneficial effects of the PCM assembly structure, which will not be elaborated here.

[0044] A third aspect of this application provides a battery pack including the single battery cells of any of the above embodiments.

[0045] In this embodiment, the battery pack includes individual cells, and therefore the individual cells have all the beneficial effects of the battery pack, which will not be described in detail here.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A PCM assembly structure, characterized in that, Includes PCM, a first conductive sheet, and a second conductive sheet; The PCB of the PCM has through holes. The first conductive sheet is electrically connected to one side of the PCB and covers the through holes. The PCB is used to place the first end of the cell, so that the first conductive sheet faces the cell and is in contact with the first electrode of the first end of the cell. The first conductive sheet is welded to the first electrode of the cell through the through holes so that the first conductive sheet is electrically connected to the first electrode. One end of the second conductive sheet is soldered to the surface of the PCB facing away from the battery cell, so that the second conductive sheet is electrically connected to the PCB. The other end of the second conductive sheet is soldered to the second electrode at the second end of the battery cell, so that the second conductive sheet is electrically connected to the second electrode.

2. The PCM assembly structure according to claim 1, characterized in that, The first conductive sheet is fixed to the PCB by means of a patch.

3. The PCM assembly structure according to claim 1, characterized in that, The PCB has a contact plate on the side surface opposite to the battery cell, and the PCB is soldered to the second conductive sheet through the contact plate.

4. The PCM assembly structure according to claim 1, characterized in that, The PCB has a pad on the side of the PCB facing away from the battery cell, and the second conductive sheet is soldered to the pad by means of soldering or thermoforming.

5. The PCM assembly structure according to claim 1, characterized in that, The PCM assembly structure also includes an insulating first adhesive tape. The PCB is bonded to the end of the first end of the battery cell by the first adhesive tape, and the first adhesive tape is ring-shaped, so that the first adhesive tape surrounds the first conductive sheet and the first electrode.

6. The PCM assembly structure according to claim 1, characterized in that, The PCM assembly structure also includes an insulating second adhesive tape, which covers and adheres to the side of the PCB facing away from the battery cell.

7. The PCM assembly structure according to claim 1, characterized in that, The PCM assembly structure also includes an insulating third adhesive tape that covers the end of the cell that is bonded to the second end.

8. The PCM assembly structure according to claim 1, characterized in that, The second conductive sheet has a welding connection part at one end for connecting to the second electrode. The welding connection part is adapted to fit and welded to the second electrode, and the welding connection part has a diversion hole.

9. A single-cell battery, characterized in that, The PCM assembly structure includes any one of claims 1 to 8.

10. A battery pack, characterized in that, Includes the single-cell battery as described in claim 9.

Images