Riveting structure of battery cell pole

Abstract

The invention discloses a riveting structure of a battery cell pole, a battery cell comprises a lower shell, an outer terminal and a current collector, the outer terminal is arranged on the outer side of the lower shell, and the current collector is arranged on the inner side of the lower shell; 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, the lower shell is provided with a first through hole, one end of the pole is fixedly connected to the inner surface of the outer terminal, and the other end of the pole is fixedly connected to the inner surface of the outer terminal. And the other end of the current collector penetrates through the first through hole and is riveted with the current collector. In the invention, the pole is fixed on the inner surface of the outer terminal, and then penetrates through the first through hole in the lower shell to be riveted with the current collecting piece, 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 present invention relates to the technical field of batteries, and in particular to a riveting structure of a battery cell pole. Background Art

[0002] With the development of new energy industry, more and more batteries are applied to automobile or energy storage industry. Among them, the pole is an important conductive component in the battery.

[0003] The square-shell battery generally includes a shell, an external terminal is arranged on the outside of the shell, the pole is welded to the outside of the external terminal, and then the bus 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, which makes it impossible for the busbar and the outer terminal 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 riveted structure for a battery cell pole, 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 problem is a riveting structure of a battery cell pole, the battery cell comprises a lower shell, an external terminal and a current collecting sheet, the external terminal is arranged on the outer side of the lower shell, and the current collecting sheet is arranged on the inner side of the lower shell; the external 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 external terminal is used to connect with the bus bar, the lower shell is provided with a first through hole, one end of the pole is fixedly connected to the inner surface of the external terminal, and the other end passes through the first through hole and is riveted to the current collecting sheet;

[0007] The pole comprises a first connecting section and a second connecting section, and a step surface is formed at the connection between the first connecting section and the second connecting section; the cross-sectional area of ​​the second connecting section gradually decreases along the second connecting section toward the first connecting section;

[0008] The current collecting sheet is provided with a second through hole, the cross-sectional area of ​​the second through hole is larger than the maximum cross-sectional area of ​​the second connecting section, and the cross-sectional area of ​​the second through hole is smaller than the cross-sectional area of ​​the first connecting section.

[0009] Furthermore, the pole is fixed to the inner surface of the outer terminal by welding or integrally die-casting.

[0010] Furthermore, the second through hole is a circular hole, and the cross-sections of the first connecting section and the second connecting section are both circular.

[0011] Furthermore, a plurality of protrusions are arranged on the step surface.

[0012] Furthermore, the plurality of protrusions on the step surface are arranged in a sawtooth shape.

[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 sheet is arranged on the inner side of the lower shell, and two second through holes are formed on the current collecting sheet. The two poles are respectively passed through one of the first through holes and then fixed to the current collecting sheet.

[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 sheets are arranged on the inner side of the lower shell, and each current collecting sheet 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 sheets.

[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) Fix the pole on the inner surface of the outer terminal, and then pass through the first through hole of the lower shell and rivet it to the current collector. The advantage of this design is that the outer surface of the outer terminal no longer has a weld protrusion due to the need to weld the pole, and the outer surface of the outer terminal is smoother, fits more closely with the busbar, and has stronger overcurrent stability.

[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 as a whole, which can reduce the number of parts during installation and improve assembly efficiency.

[0024] (3) Annular serrations are provided on the step surface. These serrations can be embedded in the current collector during riveting to prevent the pole and the current collector from rotating relative to each other, thereby enhancing the connection strength between the two. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 2 It is a schematic diagram of the structure of internal and external terminals and poles in the embodiment;

[0027] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0028] Figure 4 It is a structural schematic diagram of the current collecting sheet in the embodiment;

[0029] In the figure:

[0030] 100, external terminal;

[0031] 200, lower housing; 210, first through hole;

[0032] 300, current collecting sheet; 310, second through hole;

[0033] 400, pole; 410, first connecting section; 420, second connecting section; 430, protrusion;

[0034] 500, first plastic part;

[0035] 600, second plastic part;

[0036] 700. Sealing ring. DETAILED DESCRIPTION

[0037] 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.

[0038] Please refer to Figure 1-Figure 4 The present invention discloses a riveting structure of a battery cell pole, wherein the battery cell comprises a lower shell 200, an external terminal 100 and a current collecting sheet 300, wherein the external terminal 100 is arranged on the outer side of the lower shell 200, and the current collecting sheet 300 is arranged on the inner side of the lower shell 200; the external terminal 100 has an inner surface facing the side of the lower shell 200, and an outer surface facing away from the side of the lower shell 200, and the outer surface of the external terminal 100 is used to connect with a bus bar, and the lower shell 200 is provided with a first through hole 210, one end of the pole 400 is fixedly connected to the inner surface of the external terminal 100, and the other end passes through the first through hole 210 and is riveted with the current collecting sheet 300;

[0039] The pole 400 includes a first connecting section 410 and a second connecting section 420, and a step surface is formed at the connection between the first connecting section 410 and the second connecting section 420; the cross-sectional area of ​​the second connecting section 420 gradually decreases along the direction from the second connecting section 420 to the first connecting section 410;

[0040] The current collecting piece 300 is provided with a second through hole 310 , and the cross-sectional area of ​​the second through hole 310 is larger than the maximum cross-sectional area of ​​the second connecting section 420 , and the cross-sectional area of ​​the second through hole 310 is smaller than the cross-sectional area of ​​the first connecting section 410 .

[0041] Specifically, since the cross-sectional area of ​​the second connecting section 420 gradually decreases in the direction toward the first connecting section 410, there is a certain riveting space around the second connecting section 420 near the step surface. When the second connecting section 420 extends into the second through hole 310 and makes the step surface rest against the current collecting sheet 300, by squeezing the pole 400 and the current collecting sheet 300, the step surface squeezes the material of the current collecting sheet 300 near the second through hole 310, and the squeezed part of the material is embedded in the riveting space, so as to realize the riveting fixation of the pole 400 and the current collecting sheet 300.

[0042] It should be noted that since the maximum cross-sectional area of ​​the second connecting section 420 is smaller than the cross-sectional area of ​​the second through hole 310, the second connecting section 420 can extend into the second through hole 310, and since the cross-sectional area of ​​the first connecting section 410 is larger than the cross-sectional area of ​​the second through hole 310, the step surface can rest on the current collecting sheet 300 and squeeze the current collecting sheet 300 to complete the riveting of the pole 400 and the current collecting sheet 300.

[0043] Importantly, the present application fixes the pole 400 on the inner surface of the outer terminal 100, and then passes through the first through hole 210 at the lower shell 200 and is riveted to the current collector 300. The advantage of this design is that the outer surface of the outer terminal 100 no longer has a weld protrusion 430 due to the need to weld the pole 400, and the outer surface of the outer terminal 100 is smoother, more closely fitted with the busbar, and more stable in overcurrent.

[0044] It should also be mentioned that one end of the pole 400 is connected to the current collector 300, and the current can flow through the current collector 300 through the pole 400 to the external terminal 100, and then flow to the busbar through the external terminal 100. Therefore, installing the pole 400 on the inner surface of the external terminal 100 will not affect the circuit of the battery.

[0045] At the same time, before assembling the battery, the pole 400 is first fixed to the inner surface of the outer terminal 100 to form a whole, and then the outer terminal 100 and the pole 400 are installed as a whole on the lower shell 200, which can reduce the number of parts during installation and improve assembly efficiency.

[0046] Furthermore, the pole 400 is fixed to the inner surface of the external terminal 100 by welding or integrally die-casting.

[0047] Specifically, before assembly, the pole 400 is welded to the inner surface of the outer terminal 100 so that the pole 400 and the outer terminal 100 form a whole and can be assembled as one part during assembly.

[0048] Furthermore, the second through hole 310 is a circular hole, and the cross-sections of the first connecting section 410 and the second connecting section 420 are both circular.

[0049] Specifically, the cross section of the pole 400 is circular, and has a larger cross-sectional area than other cross-sectional shapes, so as to enhance its current carrying capacity.

[0050] Furthermore, a plurality of protrusions 430 are provided on the step surface.

[0051] The plurality of protrusions 430 on the step surface are arranged in a sawtooth shape.

[0052] Specifically, annular serrations are provided on the step surface, and these serrations can be embedded in the current collecting sheet 300 during riveting to prevent the pole 400 and the current collecting sheet 300 from rotating relative to each other, thereby enhancing the connection strength between the two.

[0053] Furthermore, two poles 400 are fixedly connected to the inner surface of the outer terminal 100;

[0054] The lower housing 200 is provided with two first through holes 210;

[0055] The current collecting piece 300 is disposed inside the lower shell 200 , and two second through holes 310 are formed on the current collecting piece 300 . The two poles 400 pass through one of the first through holes 210 respectively and are fixed to the current collecting piece 300 .

[0056] Furthermore, two poles 400 are fixedly connected to the inner surface of the outer terminal 100;

[0057] The lower housing 200 is provided with two first through holes 210;

[0058] Two current collecting pieces 300 are disposed inside the lower shell 200 , and each current collecting piece 300 is provided with a second through hole 310 . The two poles 400 pass through one of the first through holes 210 and are fixed to the current collecting piece 300 .

[0059] Specifically, when two poles 400 are required, two independent current collecting pieces 300 can be respectively arranged in the lower shell 200, and a second through hole 310 is respectively arranged on each current collecting piece 300 for riveting the pole 400; or a current collecting piece 300 can be arranged in the lower shell 200, and two second through holes 310 are simultaneously arranged on the current collecting piece 300 for riveting the pole 400.

[0060] It should be noted that if two independent current collecting pieces 300 are provided in the lower shell 200 , the two current collecting pieces 300 can be moved individually until the second through holes 310 on the two current collecting pieces 300 are aligned with the two poles 400 respectively, so as to facilitate the connection between the poles 400 and the current collecting pieces 300 .

[0061] If a current collecting sheet 300 is provided on the lower shell 200, and two poles 400 are riveted on the same current collecting sheet 300 at the same time, it is necessary to ensure that when riveting the poles 400, the two poles 400 on the current collecting sheet 300 can simultaneously pass through the two second through holes 310 on the current collecting sheet 300 for riveting. This has high precision requirements on the relative positions of the two second through holes 310 on the current collecting sheet 300, but the advantage of such a design is that the integrity of the current collecting sheet 300 is stronger, and the sealing between the current collecting sheet 300 and the lower shell 200 is better.

[0062] Furthermore, a first plastic component 500 is provided between the external terminal 100 and the lower shell 200 , and a second plastic component 600 is provided between the lower shell 200 and the current collecting sheet 300 .

[0063] Furthermore, a sealing ring 700 is disposed at the first through hole 210 .

[0064] Specifically, the first plastic part 500 , the second plastic part 600 and the sealing ring 700 are provided to seal the lower housing 200 and provide insulation.

[0065] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0066] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0067] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] 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 the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A riveting structure of a battery cell pole, the battery cell comprising a lower shell, an external terminal and a current collecting sheet, the external terminal being arranged on the outer side of the lower shell, the current collecting sheet being arranged on the inner side of the lower shell; the external terminal having an inner surface facing one side of the lower shell, and an outer surface facing away from one side of the lower shell, the outer surface of the external terminal being used to connect with a busbar, characterized in that: The lower shell is provided with a first through hole, one end of the pole is fixedly connected to the inner surface of the outer terminal, and the other end passes through the first through hole and is riveted to the current collecting sheet; The pole comprises a first connecting section and a second connecting section, and a step surface is formed at the connection between the first connecting section and the second connecting section; the cross-sectional area of ​​the second connecting section gradually decreases along the second connecting section toward the first connecting section; The current collecting sheet is provided with a second through hole, the cross-sectional area of ​​the second through hole is larger than the maximum cross-sectional area of ​​the second connecting section, and the cross-sectional area of ​​the second through hole is smaller than the cross-sectional area of ​​the first connecting section.

2. The riveting structure of a battery cell pole 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 riveting structure of a battery cell pole according to claim 1, characterized in that: The second through hole is a circular hole, and the cross-sections of the first connecting section and the second connecting section are both circular.

4. The riveting structure of a battery cell pole according to claim 1, characterized in that: A plurality of protrusions are arranged on the step surface.

5. The riveting structure of a battery cell pole according to claim 4, characterized in that: The plurality of protrusions on the step surface are arranged in a sawtooth shape.

6. The riveting structure of a battery cell pole according to claim 1, 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 sheet is arranged on the inner side of the lower shell, and two second through holes are formed on the current collecting sheet. The two poles are respectively passed through one of the first through holes and then fixed to the current collecting sheet.

7. The riveting structure of a battery cell pole according to claim 1, 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 sheets are arranged on the inner side of the lower shell, and each current collecting sheet 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 sheets.

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

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

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