Pole piece connecting structure between battery cell modules and battery pack

Abstract

The utility model discloses a pole piece connecting structure between battery cell modules, which comprises a support beam, the top of the support beam is vertically and movably connected with a connecting base, and foam is arranged between the connecting base and the support beam; two groups of pole pieces are connected to the top of the connecting base in the direction perpendicular to the length direction of the supporting beam and are connected through a connecting copper bar. According to the utility model, the connecting base and the supporting beam are supported by the foam, and the distance between the connecting base and the supporting beam can be adjusted by the adjusting column, so that the compression amount of the foam can be adjusted according to the requirement of connecting rigidity, and the flexible connection of pole pieces between modules can be adapted to different battery packs.

Description

A cell module inter-electrode connection structure, battery pack Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, specifically to a cell module inter-electrode connection structure and a battery pack. Background Technology

[0002] Electrodes are crucial components in battery packs, connecting different cells in series or parallel to achieve the high-voltage connection of the entire pack. Within the same cell module, electrodes are typically fixed to the cell terminals by welding. Between different cell modules, straight copper busbars and screws are used to connect and fix the electrode leads at the module's output end to a plastic base, which is then directly inserted into a beam. Another method involves welding a long electrode across the beam between two cell modules. Since these connections are all rigid, and the stiffness of the beam connection point between the output electrode leads of different modules is much greater than the stiffness of other parts of the cell module, when the battery pack vibrates, the difference in installation stiffness at both ends of the output electrode leads causes different amplitudes, leading to repeated bending and fatigue damage. This can result in the output electrode breaking, causing battery pack failure and even posing a fire risk.

[0003] Therefore, how to stably and reliably connect the electrodes between battery cell modules and avoid the risk of fatigue damage to the electrodes caused by hard connections is an urgent problem to be solved. Summary of the Invention

[0004] The technical problem to be solved by this invention is: how to avoid fatigue damage to the electrode due to hard connections.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A cell module inter-electrode connection structure includes a support beam, a connecting base is vertically and movably connected to the top of the support beam, and foam is provided between the connecting base and the support beam;

[0007] Two sets of electrode plates are connected along the length of the vertical support beam at the top of the connecting base, and the two sets of electrode plates are connected by a connecting copper busbar.

[0008] This utility model uses foam to support the connecting base and the support beam. The distance between the connecting base and the support beam can be adjusted by adjusting the column, so that the compression of the foam can be adjusted according to the connection rigidity requirements. It can adapt to different battery packs to make soft connections between the electrode plates of the modules.

[0009] As a further embodiment of this utility model: the connecting base includes a base body, the middle position of the base body is sunken, and the sunken position is connected to the support beam through an adjusting column.

[0010] The adjustable column in this application can adjust the distance between the connecting base and the support beam to meet different needs.

[0011] As a further embodiment of this utility model, the position where the support beam connects to the adjusting column is provided with an oblong hole.

[0012] The application provides a waist-shaped hole at the connection position between the support beam and the connecting base, allowing the connecting base to slide slightly along the length of the support beam. Additionally, a recessed hollow groove is provided on the upper middle part of the side of the base body, which can increase the slight rotation of the electrode sheet around the length of the support beam, thereby releasing multiple degrees of freedom in the connection between the electrode sheets of the modules and avoiding the risks associated with hard connections.

[0013] As a further embodiment of this utility model: the bottom surface of the adjusting column is provided with a rectangular notch in the middle, and trapezoidal steps are provided on both sides of the notch.

[0014] The rectangular notch design of this application allows the bottom of the adjusting column to have a certain degree of elasticity, making it easy to insert the connecting base into the support beam. The trapezoidal step can prevent the adjusting column from sliding out of the waist-shaped hole and maintain the connection stability between the adjusting column and the waist-shaped hole.

[0015] As a further embodiment of this utility model: the top two ends of the connecting base are provided with recessed hollow grooves, and metal inserts are embedded in the hollow grooves. The two sets of electrode plates and the through holes at both ends of the connecting copper busbar are respectively located in the corresponding hollow groove areas, and are connected to the metal inserts by screws passing through the connecting copper busbar and the electrode plates.

[0016] As a further embodiment of this utility model, grooves for adjusting columns are reserved on both sides of the foam.

[0017] As a further embodiment of this utility model: the side of the foam that contacts the connecting base is provided with double-sided adhesive.

[0018] The double-sided adhesive design here enhances the stability of the connection between the foam and the connecting base.

[0019] As a further embodiment of this utility model: the connecting copper busbar has a wavy section in the middle and connecting sections at both ends. The wavy section and the connecting sections are integrally formed, and the two sets of connecting sections are respectively connected and contacted with the electrode sheet.

[0020] The connecting copper busbar of this utility model adopts a wave-shaped design in the middle to connect the electrode plates between different battery cell modules. When vibration occurs, the wave-shaped design allows the connecting copper busbar to have a certain elastic deformation, which can reduce the risk of electrode plate breakage.

[0021] As a further embodiment of this invention: protective covers are respectively installed on the top of the connecting copper busbar and on both sides of the wave section. The protective covers are used to protect the connecting copper busbar.

[0022] This utility model also discloses a battery pack, including the above-mentioned inter-cell module electrode connection structure and a plurality of cell modules. The support beam is installed inside the battery pack housing, and two adjacent sets of cell modules are respectively connected to two sets of electrode plates on the support beam. Attached Figure Description

[0023] Figure 1 is an isometric schematic diagram of the inter-electrode connection structure of the battery cell module according to an embodiment of the present invention;

[0024] Figure 2 is an exploded view of the inter-electrode connection structure of the battery cell module according to an embodiment of the present invention;

[0025] Figure 3 is a cross-sectional view of the inter-electrode connection structure of the battery cell module according to an embodiment of the present invention;

[0026] Figure 4 is a structural schematic diagram of the connecting base according to an embodiment of the present utility model;

[0027] Figure 5 is a schematic diagram of the structure of the connecting copper busbar in an embodiment of this utility model;

[0028] Figure 6 is a top view of the connecting base according to an embodiment of the present invention;

[0029] Figure 7 is a cross-sectional view along direction AA in Figure 6;

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Support beam; 2. Foam;

[0032] 3. Connecting base; 301. Base body; 302. Metal insert; 303. Adjusting column;

[0033] 4. Electrode; 5. Connecting copper busbar; 6. Screw; 7. Protective cover. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] Example 1

[0036] Referring to Figures 1 and 2, a battery cell module electrode connection structure includes a support beam 1, foam 2, connecting base 3, electrode 4, connecting copper busbar 5, screw 6, and protective cover 7.

[0037] Referring to Figure 1, the top of the support beam 1 is machined with through holes for mounting the connecting base 3, and foam 2 is filled between the connecting base 3 and the support beam 1.

[0038] Referring to Figure 2, the side of foam 2 that contacts the connecting base 3 is equipped with double-sided adhesive to increase the reliability of the connection; foam 2 is compressible, and the installation rigidity of the connecting base 3 can be adjusted by adjusting the amount of compression of foam 2; foam 2 has an overall "I" shaped structure, and grooves for adjustment columns 303 are reserved on both sides of foam 2.

[0039] Referring to Figures 2, 4 and 6, the connecting base 3 includes a base body 301, a metal insert 302 and an adjusting column 303.

[0040] Referring to Figures 4 and 6, two threaded columns are symmetrically machined at the bottom of the base body 301 along the length of the support beam 1 for connecting the adjustment column 303; the base body 301 is recessed in the middle, with an overall "concave" shape design, and the two threaded columns are located at the bottom of the recessed middle; the top of the base body 301 is also provided with recessed hollow grooves on both sides, and countersunk holes are opened in the hollow grooves for installing metal inserts 302.

[0041] Referring to Figure 4, the metal insert 302 is installed in the countersunk holes on both sides of the top of the base body 301. The metal insert 302 is cylindrical in shape and has a threaded countersunk hole on its top for connecting screws 6.

[0042] Referring to Figure 4, the adjusting column 303 is cylindrical in shape, with a rectangular notch machined in the middle of its bottom surface. Trapezoidal steps are symmetrically machined on both sides of the notch on the cylindrical surface. The adjusting column 303 is engaged with the waist-shaped through hole at the top of the support beam 1 through the trapezoidal step features. The top of the adjusting column 303 is machined with a threaded countersunk hole, which cooperates with two threaded columns at the bottom of the base body 301. By tightening or loosening the adjusting column 303, the distance between the bottom surface of the base body 301 and the upper surface of the support beam 1 is changed, thereby adjusting the compression of the foam 2 and achieving the purpose of adjusting the installation rigidity of the connecting base 3.

[0043] Referring to Figure 4, the waist-shaped through hole machined on the top of the support beam 1 corresponds to the position of the adjusting column 303 of the connecting base 3, and the waist-shaped through hole is set along the length direction of the beam 1, so that the connecting base 3 has a certain sliding allowance along the length direction of the support beam 1.

[0044] Furthermore, the base body 301, the adjusting column 303, and the protective cover 7 are all made of insulating material.

[0045] Referring to Figure 2, electrode 4 is a dielectric that electrically connects different battery cells. One end of electrode 4 is welded and fixed to the battery cell electrode post, and the other end of electrode 4 extends out in the air and is processed with through holes.

[0046] The connecting copper busbar 5 is a medium that connects the electrode pieces 4 at the lead-out ends of different battery cell modules. The two ends of the connecting copper busbar 5 are machined with through holes. Screws 6 pass through the through holes of the connecting copper busbar 5 and the electrode pieces 4 in sequence, and cooperate with the threaded holes of the metal insert 302 to press and fix the connecting copper busbar 5 and the electrode pieces 4. The electrode pieces 4 can rotate relative to the screws 6 and the connecting copper busbar 5. It should be noted that the ends of the electrode pieces 4 are installed in the recessed hollow grooves on both sides of the top of the base body 301. In order to ensure that the electrode pieces 4 have a certain rotational margin, the width of the hollow grooves needs to be greater than the width of the electrode pieces 4.

[0047] Referring to Figure 5, the connecting copper busbar 5 has a wavy section in the middle and connecting sections at both ends. The wavy section and the connecting sections are integrally formed, and the two sets of connecting sections are respectively connected and contacted with the electrode 4. The connecting copper busbar 5 has a wavy feature in the middle, which can provide a certain elasticity when connecting the lead-out electrode 4 of different battery cell modules, avoiding direct hard connection.

[0048] Referring to Figure 2, the protective cover 7 is rectangular in shape and is fixed to the connecting base 3 by a snap fastener. It protects the connection position between the copper busbar 5 and the electrode 4 to prevent short circuits. The result after installation is shown in Figure 1.

[0049] Example 2

[0050] A battery pack includes the electrode connection structure between battery modules as described in Embodiment 1 and several battery modules. A support beam 1 is installed inside the battery pack housing and is an important load-bearing component inside the battery pack housing. The support beam 1 divides the battery pack housing into multiple areas, and each area is equipped with a battery module. Two adjacent sets of battery modules are respectively connected to two sets of electrode plates 4 on the support beam 1.

[0051] The specific operating principle of this application is as follows:

[0052] During use, the connecting base 3 and the support beam 1 are supported by foam 2. The distance between the connecting base 3 and the support beam 1 can be adjusted by adjusting column 303, so that the compression of foam 2 can be adjusted according to the connection stiffness requirements, which can adapt to different battery packs for soft connection of inter-module electrode plates. At the same time, the connecting base 3 can slide slightly along the length direction of the support beam 1, and the upper and middle parts of the side of the base body 3 are hollowed out, which can increase the slight rotation of the electrode plates around the length direction of the support beam 1, realize multiple degrees of freedom of the inter-module electrode plate connection, and avoid the risks of hard connection. The connecting copper busbar 5 adopts a wave-shaped design in the middle, which has a certain elastic deformation when connecting the electrode plates of different cell modules under vibration, which can reduce the risk of electrode plate breakage.

[0053] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cell module inter-electrode connection structure, comprising a support beam (1), characterized in that, The top of the support beam (1) is vertically movably connected to a connecting base (3), and foam (2) is provided between the connecting base (3) and the support beam (1); the top of the connecting base (3) is connected to two sets of electrode plates (4) in the direction perpendicular to the length of the support beam (1), and the two sets of electrode plates (4) are connected by a connecting copper busbar (5).

2. The cell module inter-electrode connection structure according to claim 1, characterized in that: The connecting base (3) includes a base body (301), which is lowered at the middle position and connected to the support beam (1) through an adjusting column (303) at the lowered position.

3. The cell module inter-electrode connection structure according to claim 2, characterized in that: The support beam (1) is provided with a waist-shaped hole at the connection point with the adjusting column (303).

4. The cell module inter-electrode connection structure according to claim 3, characterized in that: The bottom surface of the adjusting column (303) has a rectangular notch in the middle, and trapezoidal steps on both sides of the notch.

5. The cell module inter-electrode connection structure according to claim 2, characterized in that: The top two ends of the connecting base (3) are provided with recessed hollow grooves, and metal inserts (302) are embedded in the hollow grooves. The two ends of the two sets of electrode plates (4) and the two ends of the connecting copper busbar (5) are respectively located in the corresponding hollow grooves, and are connected to the metal inserts (302) by screws (6) passing through the connecting copper busbar (5) and the electrode plates (4).

6. The cell module inter-electrode connection structure according to claim 2, characterized in that: The foam (2) has grooves for adjusting columns (303) reserved on both sides.

7. The cell module inter-electrode connection structure according to claim 1, characterized in that: The side of the foam (2) that contacts the connecting base (3) is provided with double-sided adhesive.

8. The cell module inter-electrode connection structure according to claim 1, characterized in that: The connecting copper busbar (5) has a wave section in the middle and connecting sections at both ends. The wave section and the connecting sections are integrally formed, and the two sets of connecting sections are respectively connected to the electrode (4).

9. The cell module inter-electrode connection structure according to claim 8, characterized in that: Protective covers (7) are installed on the top of the connecting copper busbar (5) and on both sides of the wave section.

10. A battery pack, characterized in that, Includes the cell module inter-electrode connection structure as described in any one of claims 1-9 and a plurality of cell modules, wherein the support beam (1) is installed inside the battery pack housing, and two adjacent cell modules are respectively connected to two sets of electrode plates (4) on the support beam (1).

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