Pole mounting structure of battery cell

Abstract

The utility model discloses a pole mounting structure of a battery cell, which comprises a lower shell and a current collector, the current collector is arranged on the inner side of the lower shell, and a first through hole is formed in the lower shell; the pole assembly is arranged on the outer side of the lower shell and comprises an outer terminal and a pole, the outer terminal is provided with an inner surface facing one side of the lower shell and an outer surface deviating from one side of the lower shell, the outer surface of the outer terminal is used for being connected with a busbar, and the pole is fixed to the inner surface of the outer terminal; and one end, far away from the outer terminal, of the pole penetrates through the first through hole and is connected with the current collecting piece. According to the utility model, the pole is fixed on the inner surface of the outer terminal, and then passes through the first through hole at the lower shell to be connected with the current collecting sheet, so that the outer surface of the outer terminal does not have a welding seam bulge due to the need of welding the pole any more, the outer surface of the outer terminal is smoother, the fitting between the outer surface of the outer terminal and the busbar is tighter, and the over-current stability is stronger.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a pole mounting structure of a battery cell. Background Art

[0002] With the development of the new energy industry, more and more batteries are being used in automobiles or energy storage industries. Among them, the terminal is an important conductive component in the battery.

[0003] A square-shell battery generally includes a shell, an external terminal is provided on the outside of the shell, a pole is welded to the outside of the external terminal, and then a busbar is connected to the outside of the external terminal.

[0004] However, the pole outside the outer terminal will affect the fit between the busbar and the outer terminal. Even if the outer terminal can avoid the space of the pole, there will be a bulge in the weld between the pole and the outer terminal, and the height and size of the bulge cannot be controlled. This results in the busbar and the outer terminal not being able to fit tightly, and the overcurrent stability is low. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to propose a pole mounting structure for a battery cell, which is used to solve the problem in the prior art that the busbar and the external terminal cannot be tightly fitted due to the protrusion of the pole weld.

[0006] The technical solution adopted by the present invention to solve its technical problems is a pole mounting structure of a battery cell, comprising: a lower shell and a current collecting piece, the current collecting piece is arranged on the inner side of the lower shell, and a first through hole is opened on the lower shell; a pole assembly, which is arranged on the outer side of the lower shell, and the pole assembly includes an outer terminal and a pole, the outer terminal has an inner surface facing the side of the lower shell, and an outer surface away from the side of the lower shell, the outer surface of the outer terminal is used to be connected to the bus, the pole is fixed on the inner surface of the outer terminal, and the end of the pole away from the outer terminal passes through the first through hole and is connected to the current collecting piece.

[0007] Furthermore, the pole is welded and fixed to the inner surface of the outer terminal by die-casting.

[0008] Furthermore, a second through hole is formed on the current collecting sheet, and the pole is passed through the second through hole and is welded and fixed to the current collecting sheet.

[0009] Furthermore, a second through hole is provided on the current collecting sheet;

[0010] The pole is provided with an external thread;

[0011] It also includes a locking nut, and one end of the pole passes through the second through hole and is threadedly connected to the locking nut.

[0012] Furthermore, the pole and the locking nut are fixed by welding.

[0013] Furthermore, two of the poles are fixedly connected to the inner surface of the outer terminal;

[0014] The lower shell is provided with two first through holes;

[0015] A current collecting piece is provided on the inner side of the lower shell, and two second through holes are provided on the current collecting piece. The two poles pass through one of the first through holes respectively and are fixed to the current collecting piece.

[0016] Furthermore, two of the poles are fixedly connected to the inner surface of the outer terminal;

[0017] The lower shell is provided with two first through holes;

[0018] Two current collecting pieces are provided on the inner side of the lower shell, and each current collecting piece is provided with a second through hole. The two poles are respectively passed through one of the first through holes and then fixed to the current collecting piece.

[0019] Furthermore, a first plastic part is provided between the external terminal and the lower shell, and a second plastic part is provided between the lower shell and the current collecting sheet.

[0020] Furthermore, a sealing ring is provided at the first through hole.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] (1) The pole is fixed to the inner surface of the outer terminal, and then passed through the first through hole of the lower shell to connect with the current collecting plate. This can make the outer surface of the outer terminal no longer have weld protrusions due to the need to weld the pole. The outer surface of the outer terminal is smoother, the fit with the bus is tighter, and the overcurrent stability is stronger.

[0023] (2) Before assembling the battery, the pole is first fixed to the inner surface of the outer terminal to form a whole, and then the outer terminal and the pole are installed on the lower shell, which can reduce the number of parts during installation and improve assembly efficiency.

[0024] (3) By opening an external thread on the pole, the pole passes through the second through hole and is tightened with a lock nut. This method allows the lock nut to press the current collector tightly, so that the current collector can fit tightly with the plastic part in the lower shell, improving its sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is an exploded view of a battery cell in an embodiment;

[0026] Figure 2 Schematic diagram of the structure of the pole assembly in the embodiment;

[0027] Figure 3 This is a structural diagram of a current collecting sheet in an embodiment in which a first through hole is provided;

[0028] Figure 4 This is a structural diagram of an embodiment in which two first through holes are provided on the current collecting sheet;

[0029] In the picture:

[0030] 100. Lower housing; 110. First through hole;

[0031] 200, external terminal; 210, pole; 211, external thread;

[0032] 300, current collecting plate; 310, locking nut; 320, second through hole;

[0033] 400, first plastic part; 410, second plastic part; 420, sealing ring. DETAILED DESCRIPTION

[0034] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0035] Please refer to Figures 1-4 The utility model discloses a pole mounting structure of a battery cell, comprising: a lower shell 100 and a current collecting sheet 300, wherein the current collecting sheet 300 is arranged on the inner side of the lower shell 100, and a first through hole 110 is opened on the lower shell 100; a pole assembly, which is arranged on the outer side of the lower shell 100, and the pole assembly includes an outer terminal 200 and a pole 210, wherein the outer terminal 200 has an inner surface facing the side of the lower shell 100 and an outer surface facing away from the side of the lower shell 100, the outer surface of the outer terminal 200 is used to be connected to the busbar, the pole 210 is fixed on the inner surface of the outer terminal 200, and the end of the pole 210 away from the outer terminal 200 passes through the first through hole 110 and is connected to the current collecting sheet 300.

[0036] Specifically, the present application fixes the pole 210 to the inner surface of the outer terminal 200, and then passes through the first through-hole 110 of the lower housing 100 to connect to the current collecting plate 300. The advantage of this design is that the outer surface of the outer terminal 200 no longer has weld protrusions due to the need to weld the pole 210. The outer surface of the outer terminal 200 is smoother, fits more closely with the busbar, and has stronger overcurrent stability.

[0037] It should be noted that the other end of the pole 210 is connected to the current collecting plate 300. Current can flow through the current collecting plate 300, through the pole 210, to the external terminal 200, and then to the busbar through the external terminal 200. Therefore, installing the pole 210 on the inner surface of the external terminal 200 will not affect the battery circuit.

[0038] At the same time, before assembling the battery, the pole 210 is first fixed to the inner surface of the outer terminal 200 to form a whole, and then the outer terminal 200 and the pole 210 are installed on the lower shell 100, which can reduce the number of parts during installation and improve assembly efficiency.

[0039] Furthermore, the pole 210 is fixed to the inner surface of the outer terminal 200 by welding or integrally die-casting.

[0040] Specifically, before assembly, the pole 210 is welded to the inner surface of the outer terminal 200 so that the pole 210 and the outer terminal 200 form a whole and can be assembled as one part during assembly.

[0041] Furthermore, a second through hole 320 is formed on the current collecting piece 300 , and the pole 210 is passed through the second through hole 320 and is welded and fixed to the current collecting piece 300 .

[0042] Specifically, the second through hole 320 is formed on the current collecting piece 300 , and the end of the pole 210 is passed through the second through hole 320 and then fixed by welding, which can increase the contact area between the current collecting piece 300 and the pole 210 and improve the overcurrent stability.

[0043] Furthermore, by replacing the original riveting with welding, the pole 210 no longer has a boss generated by press riveting, and the pole 210 is a complete cylindrical shape with a stronger current carrying capacity.

[0044] Furthermore, the current collecting piece 300 is provided with a second through hole 320;

[0045] The pole 210 is provided with an external thread 211;

[0046] A locking nut 310 is further included. One end of the pole 210 passes through the second through hole 320 and is threadedly connected to the locking nut 310 .

[0047] Specifically, the external thread 211 is formed on the pole 210, and the pole 210 is passed through the second through hole 320 and then tightened with the lock nut 310. This method allows the lock nut 310 to press the current collecting piece 300 tightly, and the current collecting piece 300 can fit tightly with the plastic part in the lower housing 100, improving its sealing.

[0048] Furthermore, the pole 210 and the locking nut 310 are fixed by welding.

[0049] Specifically, after tightening the locking nut 310 , the locking nut 310 is fixed to the pole 210 by welding, which can prevent the locking nut 310 from loosening and causing a circuit breaker between the pole 210 and the current collecting piece 300 .

[0050] Furthermore, two poles 210 are fixedly connected to the inner surface of the outer terminal 200;

[0051] The lower housing 100 is provided with two first through holes 110;

[0052] The current collecting piece 300 is provided inside the lower housing 100 , and two second through holes 320 are defined on the current collecting piece 300 . The two poles 210 pass through one of the first through holes 110 respectively and are fixed to the current collecting piece 300 .

[0053] Specifically, the present application provides a solution for providing two poles 210 on the inner surface of the outer terminal 200. A current collecting plate 300 is provided on the inner side of the lower housing 100, and two second through-holes 320 are provided on the same current collecting plate 300. The two poles 210 are respectively passed through the first through-holes 110 and then simultaneously fixed to the same current collecting plate 300. The advantage of this design is that the two poles 210 are simultaneously fixed to the same current collecting plate 300, the connection strength of the current collecting plate 300 is higher, and the sealing between the lower housing 100 and the current collecting plate 300 is better. However, the positioning accuracy of the two poles 210 is required to be higher.

[0054] Furthermore, two poles 210 are fixedly connected to the inner surface of the outer terminal 200;

[0055] The lower housing 100 is provided with two first through holes 110;

[0056] Two current collecting pieces 300 are provided inside the lower housing 100 , and each current collecting piece 300 is provided with a second through hole 320 . The two poles 210 pass through one of the first through holes 110 and are fixed to the current collecting piece 300 .

[0057] Specifically, the present application can also provide a solution for setting two poles 210 on the inner surface of the outer terminal 200. Among them, two current collecting pieces 300 are set on the inner side of the lower shell 100, and the two current collecting pieces 300 are separated. Each pole 210 is fixed to a current collecting piece 300 after passing through the first through hole. The advantage of this design is that since there is no direct connection between the two current collecting pieces 300, their positions can be moved according to the positions of the poles 210. Even if there is a large error in the relative positions of the two poles 210, the poles 210 can be aligned with the second through holes 320 on the current collecting pieces 300 by moving the current collecting pieces 300, thereby achieving the connection and fixation of the poles 210 and the current collecting pieces 300.

[0058] It can be seen that the above solution can allow a larger error in the positions of the two poles 210 on the external terminal 200, thereby reducing manufacturing costs and assembly difficulty.

[0059] Furthermore, a first plastic component 400 is provided between the external terminal 200 and the lower shell 100 , and a second plastic component 410 is provided between the lower shell 100 and the current collecting sheet 300 .

[0060] Furthermore, a sealing ring 420 is provided at the first through hole 110 .

[0061] Specifically, the first plastic part 400 , the second plastic part 410 and the sealing ring 420 are provided to seal the lower housing 100 and provide insulation.

[0062] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0063] In addition, terms such as "first," "second," and "an" in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0064] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0065] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

Claims

1. A pole mounting structure for a battery cell, characterized in that: include: A lower shell and a current collecting plate, wherein the current collecting plate is arranged on the inner side of the lower shell, and a first through hole is opened on the lower shell; A pole assembly is arranged on the outside of the lower shell, and the pole assembly includes an outer terminal and a pole. The outer terminal has an inner surface facing the side of the lower shell and an outer surface facing away from the side of the lower shell. The outer surface of the outer terminal is used to connect to the busbar. The pole is fixed to the inner surface of the outer terminal. The end of the pole away from the outer terminal passes through the first through hole and is connected to the collecting sheet.

2. The pole mounting structure of a battery cell according to claim 1, characterized in that: The pole is fixed to the inner surface of the outer terminal by welding or integrally die-casting.

3. The pole mounting structure of a battery cell according to claim 1, characterized in that: The current collecting sheet is provided with a second through hole, and the pole is passed through the second through hole and is welded and fixed to the current collecting sheet.

4. The battery cell pole mounting structure according to claim 1, characterized in that: A second through hole is provided on the current collecting sheet; The pole is provided with an external thread; It also includes a locking nut, and one end of the pole passes through the second through hole and is threadedly connected to the locking nut.

5. The battery cell pole mounting structure according to claim 4, characterized in that: The pole and the locking nut are fixed by welding.

6. A pole mounting structure for a battery cell according to any one of claims 3 to 5, characterized in that: Two poles are fixedly connected to the inner surface of the outer terminal; The lower shell is provided with two first through holes; A current collecting piece is provided on the inner side of the lower shell, and two second through holes are provided on the current collecting piece. The two poles pass through one of the first through holes respectively and are fixed to the current collecting piece.

7. A pole mounting structure for a battery cell according to any one of claims 3 to 5, characterized in that: Two poles are fixedly connected to the inner surface of the outer terminal; The lower shell is provided with two first through holes; Two current collecting pieces are provided on the inner side of the lower shell, and each current collecting piece is provided with a second through hole. The two poles are respectively passed through one of the first through holes and then fixed to the current collecting piece.

8. The battery cell pole mounting structure according to claim 1, characterized in that: A first plastic component is provided between the external terminal and the lower shell, and a second plastic component is provided between the lower shell and the current collecting sheet.

9. The battery cell pole mounting structure according to claim 1, characterized in that: A sealing ring is provided at the first through hole.

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