Output pole structure and battery pack

Abstract

The utility model provides an output pole structure and a battery pack. The output pole structure comprises a body, a first connecting part, a second connecting part and an output part. The first connecting part is connected with one end of the body, and the second connecting part is connected with the other end of the body in the length direction; the first connecting part and the second connecting part are respectively positioned on two opposite sides of the body along the height direction of the body, and both the first connecting part and the second connecting part are used for being connected with an output pole of a battery cell module. The body is further connected with the output part, and the output part is used for being connected with a connecting bar. According to the output pole structure provided by the invention, the connecting parts are arranged at the two opposite ends, in the length direction, of the body, and the two connecting parts are located at the two opposite sides of the body in the height direction of the body, so that the output pole structure can be adaptively connected to the two opposite sides, namely the output pole columns led out from the two sides, of the battery cell module; and the current generated by the battery cell module can be transmitted to the outside of the battery cell module through the output part.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to an output pole structure and a battery pack. BACKGROUND

[0002] The existing battery cell module composed of bipolar pole battery cells usually needs to lead out an output pole on one side of the battery cell module, and connect the output pole by an aluminum row to form an output pole structure of the battery cell module.

[0003] The battery cell module composed of four-pole battery cells usually needs to lead out output poles on both sides of the battery cell module. Since the existing output pole structure, i.e. the aluminum row, which is suitable for the battery cell module composed of bipolar pole battery cells, only has one connecting part for connecting the output pole, it is not suitable for the battery cell module composed of four-pole battery cells. CONTENT OF THE UTILITY MODEL

[0004] The present application provides an output pole structure and a battery pack, which can be connected to the output poles led out on both sides of the battery cell module.

[0005] Specifically, the present application is realized by the following technical solutions:

[0006] The present application provides an output pole structure, which comprises:

[0007] a body, a first connecting part, a second connecting part and an output part;

[0008] The first connecting part is connected to one end of the body, and the second connecting part is connected to the other end of the body along the length direction. The first connecting part and the second connecting part are located on opposite sides of the body along the height direction of the body, and the first connecting part and the second connecting part are both used for connecting the output poles of the battery cell module.

[0009] The body is further connected to the output part, and the output part is used for connecting the connecting row.

[0010] Optionally, at least part of the structure of the body and the first connecting part are made of different materials, and the conductivity of at least part of the structure of the body is greater than that of the first connecting part.

[0011] And / or, at least part of the structure of the body and the second connecting part are made of different materials, and the conductivity of at least part of the structure of the body is greater than that of the second connecting part.

[0012] Optionally, at least part of the structure of the body is made of copper, and the first connecting part and / or the second connecting part are made of aluminum.

[0013] Optionally, the first connecting portion comprises a first welding surface extending in a thickness direction of the body; and the second connecting portion comprises a second welding surface extending in the thickness direction of the body.

[0014] The first welding surface and the second welding surface extend in the same direction.

[0015] Optionally, the output pole structure further comprises a buffer portion.

[0016] The buffer portion has a movement space in a length direction and / or a thickness direction of the body.

[0017] One end of the buffer portion is connected to the body, and at least one of the first welding surface and the second welding surface is connected to the other end of the buffer portion.

[0018] Optionally, the buffer portion extends straight in the length direction of the body first, and then extends in the thickness direction of the body.

[0019] And / or, the thickness of the buffer portion is equal to the thickness of the first connecting portion and / or the second connecting portion.

[0020] And / or, the thickness of the buffer portion is equal to the thickness of the first connecting portion and / or the second connecting portion, and the thickness is h1; the thickness of the body is h2, and h2>h1 is satisfied.

[0021] Optionally, the body comprises a long strip-shaped transition section and two connecting sections arranged at intervals.

[0022] The two connecting sections comprise a first connecting section and a second connecting section.

[0023] The long strip-shaped transition section is located between the first connecting section and the second connecting section, and is connected to both the first connecting section and the second connecting section; the first connecting section is further connected to the first connecting portion, and the second connecting section is further connected to the second connecting portion.

[0024] The first connecting section has a first end portion connected to the long strip-shaped transition section, and a second end portion connected to the first connecting portion; the second connecting section has a third end portion connected to the long strip-shaped transition section, and a fourth end portion connected to the second connecting portion.

[0025] The cross-sectional area of the second end portion is greater than the cross-sectional area of the first end portion; and / or, the cross-sectional area of the fourth end portion is greater than the cross-sectional area of the third end portion.

[0026] Optionally, the output section includes a flange structure that bends and extends from the second end and / or the fourth end, the flange structure having a connection hole for connecting the connection row.

[0027] This application also provides a battery pack, including: a cell module and an output electrode structure as described above;

[0028] The battery cell module includes a first terminal and a second terminal with the same polarity; the first connecting part is connected to the first terminal, and the second connecting part is connected to the second terminal.

[0029] Optionally, the battery cell module has a first side and a second side disposed opposite to each other;

[0030] The battery cell module also includes a third terminal and a fourth terminal with the same polarity;

[0031] The first pole and the third pole are disposed on the first side, and the second pole and the fourth pole are disposed on the second side;

[0032] The first and second terminals are both positive terminals, and the third and fourth terminals are both negative terminals; or, the first and second terminals are both negative terminals, and the third and fourth terminals are both positive terminals.

[0033] The technical solution provided in this application can achieve the following beneficial effects:

[0034] This application provides an output pole structure and a battery pack. By providing connecting parts at both ends of the main body along its length and with the two connecting parts located on opposite sides of the main body along its height, it can be adapted to connect to the output poles on both sides of the battery cell module, which is beneficial for outputting the current generated by the battery cell module to the outside of the battery cell module through the output part. Attached Figure Description

[0035] Figure 1 This is a schematic diagram illustrating the assembly of a battery module and an output electrode structure within a battery pack, as shown in an exemplary embodiment of this application.

[0036] Figure 2 This is a schematic diagram of the battery cell and output electrode structure shown in an exemplary embodiment of this application.

[0037] Figure 3 This is a schematic diagram of a battery module with bipolar leads on one side, as shown in an exemplary embodiment of this application.

[0038] Figure 4 yes Figure 3 The diagram shows the structural schematic of the battery module and the output electrode structure.

[0039] Figure 5 is a structure schematic view of two battery modules connected in series. Figure 3

[0040] Figure 6 is another structure schematic view of two battery modules connected in series. Figure 3

[0041] Figure 7 is a structure schematic view of an output pole structure according to an example embodiment of the present application.

[0042] Figure 8 is a partial structure schematic view of an output pole structure according to an example embodiment of the present application.

[0043] Reference signs: 1, output pole structure; 10, body; 101, long strip-shaped transition section; 102, first connecting section; 102a, first end portion; 102b, second end portion; 103, second connecting section; 103a, third end portion; 103b, fourth end portion; 11, first connecting portion; 111, first welding surface; 12, second connecting portion; 13, output portion; 131, flange structure; 132, connecting hole; 14, buffer portion; 2, battery cell module; 20, battery cell; 20a, first side portion; 20b, second side portion; 23, first pole; 24, second pole; 25, third pole; 26, fourth pole; 3, copper bar; A, length direction; B, thickness direction; C, height direction. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments (or, modes of implementation) of the present application will be described clearly and completely below with reference to the drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0045] If the present embodiments involve directional indications or positional relationships (such as up, down, left, right, front, back, inner, outer, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships, movement conditions, etc. between components in a certain specific posture (as shown in the drawings); if the specific posture changes, the directional indications or positional relationships also change accordingly. In addition, the terms “first”, “second”, etc. in the present embodiments are only used for convenience of description, and cannot be understood as indicating or implying relative importance.

[0046] Please refer to Figure 1 and Figure 2 ​​The battery pack provided by the application comprises a battery cell module 2 and an output pole structure 1. The battery cell module 2 comprises first and second poles 23 and 24 with the same polarity. When the first and second poles 23 and 24 are used as output poles, they can be both positive poles or both negative poles.

[0047] The output pole structure 1 comprises first and second connecting portions 11 and 12. The first connecting portion 11 is connected with the first pole 23, and the second connecting portion 12 is connected with the second pole 24. In this way, the current generated by the battery cell module 2 can be collected by the output pole structure 1 and delivered to the outside of the battery cell module.

[0048] Please continue to refer to Figure 1 and Figure 2 In one embodiment, the battery cell module 2 has first and second side portions 20a and 20b arranged oppositely. The battery cell module 2 further comprises third and fourth poles 25 and 26 with the same polarity. The first and third poles 23 and 25 are arranged on the first side portion 20a, and the second and fourth poles 24 and 26 are arranged on the second side portion 20b. The first and second poles 23 and 24 are both positive poles, and the third and fourth poles 25 and 26 are both negative poles; or the first and second poles 23 and 24 are both negative poles, and the third and fourth poles 25 and 26 are both positive poles. In this way, by leading out poles with the same polarity on both opposite sides of the battery cell module 2, after the first and second poles 23 and 24 are used as output poles, the third and fourth poles 25 and 26 can be connected to the adjacent battery cells in a shorter line, thereby improving the space utilization.

[0049] Exemplarily, as shown in Figure 1 and Figure 2 The battery cell module 2 comprises a plurality of battery cells 20, which are blade battery cells in the shape of rectangular sheets. The first and fourth poles 23 and 26 are arranged on one side of the blade battery cells, and the second and third poles 24 and 25 are arranged on the other side. When the first and second poles 23 and 24 are both positive poles, the third and fourth poles 25 and 26 are both negative poles; when the first and second poles 23 and 24 are both negative poles, the third and fourth poles 25 and 26 are both positive poles. Of course, the specific structure of the battery cells 20 is not limited to this.

[0050] In assembling the battery pack, one of the blade cells located at the outermost side of the cell module 2 is reserved with a pair of same polarity poles, for example, the first pole 23 and the second pole 24 which are both positive poles, as output pole poles, and connected with the output pole structure 1. Then the third pole 25 and the fourth pole 26 which are both negative poles of the blade cell are correspondingly connected in series with two positive pole poles of the adjacent blade cell. Again, two negative pole poles of the adjacent blade cell are correspondingly connected in series with two positive pole poles of the other blade cell. By sequentially connecting the poles of all the blade cells, the assembly of the cell module 2 can be completed. Finally, the adjacent two cell modules 2 are connected by using a connecting row such as a copper row, i.e. the connecting row is connected to the output portion 13 of the output pole structure 1, and through the output pole structure 1 and the connecting row, the plurality of cell modules 2 can be assembled into a battery pack.

[0051] In another embodiment, as shown in Figure 3 and Figure 4 , the first pole 23 and the second pole 24 can also be located on the same side of the cell module 2, and a copper row 3 is used to connect the first pole 23 and the second pole 24 in one cell module 2. Then the connection between the copper rows 3 is used to realize the series connection of the two cell modules 2 as shown in Figure 5 . It can be understood that when the first pole 23 and the second pole 24 of one of the cell modules 2 are both positive poles, the first pole 23 and the second pole 24 of the other cell module 2 are both negative poles.

[0052] Of course, in other embodiments, as shown in Figure 6 , one copper row 3 can be used to connect the first pole 23 and the second pole 24 of the two cell modules 2 which are arranged close to each other, and another copper row 3 can be used to connect the first pole 23 and the second pole 24 of the two cell modules 2 which are arranged away from each other. In this way, the overcurrent area of a single copper row 3 can be reduced.

[0053] Referring to Figure 7 , the application provides an output pole structure 1, comprising a body 10, a first connecting portion 11, a second connecting portion 12 and an output portion 13.

[0054] The first connecting portion 11 is connected with one end of the body 10, and the second connecting portion 12 is connected with the other end of the body 10 along the length direction A. The first connecting portion 11 and the second connecting portion 12 are located on opposite sides of the body 10 along the height direction C of the body 10, and the first connecting portion 11 and the second connecting portion 12 are both used to connect with the output pole poles of the cell module 2. In addition, the body 10 is also connected with the output portion 13, and the output portion 13 is used to connect with the connecting row.

[0055] The battery pack usually has a plurality of battery cell modules 2, and the plurality of battery cell modules 2 can be connected in series by using a connecting row. The output pole structure 1 is a connecting piece arranged between the battery cell module 2 and the connecting row. The output pole structure 1 provided in the above scheme is provided with a connecting part at each of the opposite ends of the body 10 in the length direction A, and the two connecting parts are located on the opposite sides of the body 10 in the height direction of the body 10, which can be connected to the output pole column led out on both sides of the battery cell module 2, and is beneficial to transmit the current generated by the battery cell module 2 to the outside of the battery cell module 2 through the output part.

[0056] As shown in Figure 1 and Figure 2 When the output pole column is led out on both sides of the battery cell module 2, the heights of the first pole column 23 and the second pole column 24 relative to the center line O of the battery cell 20 extending in the length direction A are not equal. That is, one pole column is located above the center line O, and one is located below the center line. Therefore, by setting the heights of the first connecting part 11 and the second connecting part 12 relative to the body 10 to be different, the connection with the first pole column 23 and the second pole column 24 can be facilitated.

[0057] In one embodiment, at least part of the structure of the body 10 and the material of the first connecting part 11 are different, and the conductivity of at least part of the structure of the body 10 is greater than the conductivity of the first connecting part 11. Or at least part of the structure of the body 10 and the material of the second connecting part 12 are different, and the conductivity of at least part of the structure of the body 10 is greater than the conductivity of the second connecting part 12. Therefore, by setting the output pole structure 1 to be composed of materials with different conductivities, the problem of insufficient flow area caused by using only a single material with small conductivity can be avoided, and the problem of high production cost caused by using only a single material with large conductivity can also be avoided.

[0058] In one embodiment, at least part of the structure of the body 10 is a copper piece, and the first connecting part 11 and / or the second connecting part 12 is an aluminum piece. Therefore, not only can the problem of insufficient flow area of the aluminum row be solved by using the copper row, but also the connection of the first connecting part 11 and / or the second connecting part 12 with the output pole column can be facilitated.

[0059] Please continue to refer to Figure 7 In one embodiment, the first connecting part 11 includes a first welding surface 111 bent and extending in the thickness direction B of the body 10. The second connecting part 12 includes a second welding surface (not shown in the figure) bent and extending in the thickness direction B of the body 10. The first welding surface 111 and the second welding surface extend in the same direction. Therefore, the welding with the output pole column can be facilitated.

[0060] Please refer to Figure 7 and Figure 8In an embodiment, the output pole structure 1 further comprises a buffer portion 14. The buffer portion 14 has a space in the length direction and / or the thickness direction of the body 10. One end of the buffer portion 14 is connected to the body 10, and the other end of the buffer portion 14 is connected to at least one of the first welding surface 111 and the second welding surface. Since the output pole structure 1 provided by the present application has two welding surfaces, by arranging the buffer portion 14, the problem of poor welding between the welding surface and the output pole due to dimensional tolerance can be avoided as much as possible.

[0061] Exemplarily, only one buffer portion 14 can be arranged between the first welding surface 111 and the body 10, and no buffer portion 14 is arranged between the second welding surface and the body 10. In the welding process, the second welding surface and the second pole 24 are welded first, and then the first welding surface 111 and the first pole 23 are welded. During the welding process, since the buffer portion 14 has a space, the probability of poor welding can be reduced. Of course, in other examples, buffer portions 14 can be arranged between the first welding surface 111 and the body 10, and between the second welding surface and the body 10.

[0062] Please continue to refer to Figure 7 and Figure 8 In an embodiment, the buffer portion 14 extends straight along the length direction of the body 10 first, and then continues to extend in a bent manner along the thickness direction of the body 10. In this way, the buffer function of the buffer portion 14 can be realized by the part structure extending in a bent manner.

[0063] In an embodiment, the thickness of the buffer portion 14 is equal to the thickness of the first connecting portion 11 and / or the second connecting portion 12. In this way, the buffer portion 14 can be integrally formed with the first connecting portion 11 and / or the second connecting portion 12 or separately welded. It can be understood that when the material of the buffer portion 14 is different from the material of the first connecting portion 11 and / or the second connecting portion 12, the separately welded manner can be adopted. When the material of the buffer portion 14 is the same as the material of the first connecting portion 11 and / or the second connecting portion 12, the integrally formed manner can be adopted.

[0064] In an embodiment, the thickness of the buffer portion 14 is equal to the thickness of the first connecting portion 11 and / or the second connecting portion 12, and the thickness is h1; the thickness of the body 10 is h2, and h2>h1 is satisfied. In this way, the body 10 can have a larger flow capacity.

[0065] Please continue to refer to Figure 7 In an embodiment, the body 10 comprises a long strip-shaped transition 101 and two connecting sections arranged at intervals. The two connecting sections comprise a first connecting section 102 and a second connecting section 103.

[0066] The long strip-shaped transition section 101 is located between the first connecting section 102 and the second connecting section 103, and is connected with both the first connecting section 102 and the second connecting section 103. The first connecting section 102 is further connected with the first connecting part 11, and the second connecting section 103 is further connected with the second connecting part 12.

[0067] The first connecting section 102 has a first end portion 102a connected with the long strip-shaped transition section 101, and a second end portion 102b connected with the first connecting part 11. The second connecting section 103 has a third end portion 103a connected with the long strip-shaped transition section 101, and a fourth end portion 103b connected with the second connecting part 12.

[0068] The cross-sectional area of the second end portion 102b is greater than that of the first end portion 102a, and / or the cross-sectional area of the fourth end portion 103b is greater than that of the third end portion 103a. In this way, the flow capacity of the body 10 can be increased while the structural strength of the body is also improved.

[0069] It should be noted that when the first connecting section 102 and the second connecting section 103 are both connected with the long strip-shaped transition section 101 separately, the cross-sectional area of the first end portion 102a and the third end portion 103a is the area of the connecting surface.

[0070] In one embodiment, the long strip-shaped transition section 101 can be made of copper, the first connecting section 102 and the second connecting section 103 are both made of aluminum, and the first connecting part 11 and the second connecting part 12 are also both made of aluminum. The first connecting part 11 and the first connecting section 102 are integrally formed, and the second connecting part 12 and the second connecting section 103 are integrally formed.

[0071] The connection manner of the first connecting section 102 with the long strip-shaped transition section 101 and the connection manner of the second connecting section 103 with the long strip-shaped transition section 101 include, but are not limited to, at least one of ultrasonic welding, friction stir welding, brazing, flash welding, laser welding, and high polymer diffusion welding.

[0072] In other embodiments, the long strip-shaped transition section 101, the first connecting section 102, and the second connecting section 103 of the body 10 can all be made of copper, and the first connecting part 11 and the second connecting part 12 are both made of aluminum.

[0073] Please continue to refer to Figure 7 and Figure 8 In one embodiment, the output part 13 includes a flange structure 131 bent and extended from the second end portion 102b and / or the fourth end portion 103b, and the flange structure 131 is provided with a connecting hole 132 for connecting with the connecting row. In this way, the connection with the connecting row is facilitated. Exemplarily, the flange structure 131 can be formed only on the fourth end portion 103b, but is not limited thereto.

[0074] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of the present application is not limited to the precise structures described in the above embodiments and shown in the drawings; any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. An output electrode structure, characterized by, The output pole structure comprises: a body, a first connecting part, a second connecting part and an output part; the first connecting part is connected with one end of the body, and the second connecting part is connected with the other end of the body along the length direction; the first connecting part and the second connecting part are respectively located on opposite sides of the body along the height direction of the body, and the first connecting part and the second connecting part are both used for connecting with the output pole of the battery cell module; the body is further connected with the output part, and the output part is used for connecting with the connecting row.

2. The output pole structure according to claim 1, characterized in that At least part of the structure of the body and the material of the first connecting part are different, and the conductivity of at least part of the structure of the body is greater than the conductivity of the first connecting part; and / or, at least part of the structure of the body and the material of the second connecting part are different, and the conductivity of at least part of the structure of the body is greater than the conductivity of the second connecting part.

3. The output pole structure according to claim 2, characterized in that At least part of the structure of the body is a copper piece, and the first connecting part and / or the second connecting part is an aluminum piece.

4. The output pole structure of claim 1, wherein The first connecting part comprises a first welding surface which is bent and extended along the thickness direction of the body; the second connecting part comprises a second welding surface which is bent and extended along the thickness direction of the body; the extension directions of the first welding surface and the second welding surface are the same.

5. The output pole structure of claim 4, wherein The output pole structure further comprises a buffer part; the buffer part has a moving space in the length direction and / or the thickness direction of the body; one end of the buffer part is connected with the body, and at least one of the first welding surface and the second welding surface is connected with the other end of the buffer part.

6. The output pole structure of claim 5, wherein The buffer part is first extended directly along the length direction of the body, and then continues to be bent and extended along the thickness direction of the body; and / or, the thickness of the buffer part is equal to the thickness of the first connecting part and / or the second connecting part; and / or, the thickness of the buffer part is equal to the thickness of the first connecting part and / or the second connecting part, and the thickness is h1; the thickness of the body is h2, and h2>h1 is satisfied.

7. The output pole structure according to any one of claims 1 to 6, characterized in that The body comprises a long strip-shaped transition section and two spaced connecting sections; the two connecting sections comprise a first connecting section and a second connecting section; the long strip-shaped transition section is located between the first connecting section and the second connecting section, and is connected with the first connecting section and the second connecting section; the first connecting section is further connected with the first connecting part, and the second connecting section is further connected with the second connecting part; one end of the first connecting section connected with the long strip-shaped transition section is a first end part, and one end of the first connecting section connected with the first connecting part is a second end part; one end of the second connecting section connected with the long strip-shaped transition section is a third end part, and one end of the second connecting section connected with the second connecting part is a fourth end part; the cross-sectional area of the second end part is greater than the cross-sectional area of the first end part; and / or, the cross-sectional area of the fourth end part is greater than the cross-sectional area of the third end part.

8. The output pole structure of claim 7, wherein The output part comprises a flange structure which is bent and extended from the second end part and / or the fourth end part, and the flange structure is provided with a connecting hole used for connecting the connecting row.

9. A battery pack, characterized by, The output pole structure comprises: a battery cell module and the output pole structure according to any one of claims 1 to 8; The battery cell module comprises first and second poles of the same polarity; the first connecting part is connected with the first pole, and the second connecting part is connected with the second pole.

10. The battery pack of claim 9, wherein, The battery cell module has first and second sides arranged opposite to each other; The battery cell module further comprises third and fourth poles of the same polarity; The first and third poles are arranged on the first side, and the second and fourth poles are arranged on the second side; The first and second poles are both positive poles, and the third and fourth poles are both negative poles; or the first and second poles are both negative poles, and the third and fourth poles are both positive poles.

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