A battery module connection structure and battery module thereof

Abstract

The present invention is applicable to the field of battery technology, and provides a battery module connection structure and a battery module thereof, wherein the battery module includes a plurality of batteries, and the batteries are electrically connected to each other through the connection structure. The battery module connection structure includes a hollow fastener and a connecting plate, and the fastener can pass through the first through hole of the connecting plate to be detachably connected to the battery pole, so that the electrical connection portion of the connecting plate is in close surface contact with the battery pole. The present invention uses a fastener to fix the connecting plate on the battery pole. Since the hollow structure of the fastener reduces the weight of the fastener, the overall weight of the battery module is reduced, thereby improving the weight energy density of the battery module; at the same time, since a force-applying portion is provided in the hollow cavity of the fastener, no height space is occupied, thereby improving the volume energy density of the battery module. Therefore, the battery module connection structure of the present invention is very suitable for high-rate battery modules, effectively improving the energy density of the battery module, and having good electrical connection stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and in particular relates to a battery module connection structure and a battery module thereof. Background Art

[0002] In order to facilitate battery maintenance and subsequent recycling, a detachable connection method for battery modules has emerged. Generally, traditional threaded connections are used to achieve series and parallel connection between batteries, that is, traditional screw and nut solutions are used.

[0003] For example, in patent CN201210104195.5, a battery terminal is provided in the battery pole, the battery terminal is inserted into the bus bar, and a thread is provided on the battery terminal; a threaded nut is used to be threadedly connected to the battery terminal to achieve a tight connection with the battery pole, thereby fixing and electrically connecting the bus bar to the battery pole to form a battery module.

[0004] On the one hand, in the connection structure of patent CN201210104195.5, one structure is that the connecting plate and the pole are connected by a nut. However, the nut does not provide a force to make the connecting plate close to the pole. In another structure, the connecting plate and the pole are directly connected. In this structure, the connecting plate and the pole are connected by a thread. Although the threaded connection provides a force to make the connecting plate close to the pole, the force provided by the thread is relatively small. In other words, in the connection structure of patent CN201210104195.5, the connection between the connecting plate and the pole is unstable.

[0005] On the other hand, the connection structure in patent CN201210104195.5 has a large space and weight occupied by the screws themselves, and each pole requires at least one nut or screw. The screws account for a large proportion of the weight of the entire battery module, and due to the large space occupied by the height, it is difficult to increase the weight energy density and volume energy density of the battery module, resulting in a waste of cost.

[0006] Furthermore, under high-rate operating conditions of the battery module, small screws cannot ensure reliable electrical connection, and the diameter and length of the screws or nuts need to be increased. This adds obstacles to the improvement of the capacity density of high-rate battery modules. Summary of the Invention

[0007] In order to address the deficiencies of the prior art, the object of the present invention is to provide a battery module connection structure and a battery module thereof that are conducive to improving the stability of the connection, the weight energy density, and the volume energy density of the battery module.

[0008] A battery module connection structure, characterized by comprising a fastener and a connection piece;

[0009] The fastener includes an extension portion and a lap portion, wherein the lap portion is provided on the outer periphery of the extension portion;

[0010] The connecting piece includes an electrical connecting portion, and the electrical connecting portion is provided with a first through hole;

[0011] After the extension portion passes through the first through hole, it is detachably connected to the battery pole, and at least a portion of the electrical connection portion is located between the overlapping portion and the outer end surface of the battery pole.

[0012] Furthermore, the extension portion has a hole along its axial direction.

[0013] Furthermore, the hole in the extension portion along its axial direction is non-circular.

[0014] Furthermore, the connecting piece includes a connecting piece body, the electrical connecting portion and the connecting piece body are connected via a transition portion, and the electrical connecting portion and the connecting piece body are spaced apart in the axial direction.

[0015] Furthermore, the transition portion includes an inclined section, and two ends of the inclined section are respectively connected to the electrical connection portion and the connecting piece body. In this solution, the electrical connection portion and the transition portion are integrally formed.

[0016] Furthermore, the transition portion includes an inclined section and a horizontal section, one end of the inclined section is connected to the connecting piece body, the other end of the inclined section is connected to one end of the horizontal section, and the other end of the horizontal section is connected to the electrical connection portion. In this solution, the electrical connection portion is welded to the transition portion.

[0017] In another solution, the electrical connection portion is located below the bottom of the transition portion. In this solution, the electrical connection portion is welded to the transition portion.

[0018] Furthermore, a buffer portion is provided on the connecting piece body, and the buffer portion is located between two adjacent electrical connecting portions.

[0019] Furthermore, the buffer portion is any one of a boss, a depression, and a wave, or a combination thereof.

[0020] Furthermore, the outer end surface of the overlapping portion and the outer surface of the connecting piece body are on the same plane.

[0021] Furthermore, an external thread is provided on the outside of the extension portion, and the external thread is fastened to the internal thread of the battery pole.

[0022] The present invention also provides a battery module, comprising at least two battery cells, wherein the at least two battery cells are connected using any of the aforementioned battery module connection structures.

[0023] Compared with the prior art, the battery module connection structure and battery module of the present invention have at least the following beneficial effects:

[0024] 1. In the present invention, at least a portion of the electrical connection portion is located between the overlap portion and the outer end surface of the battery terminal. In other words, the fastener provides a force that forces the connecting piece to approach the battery terminal. Moreover, this force can achieve a stable connection between the connecting piece and the battery terminal.

[0025] 2. The connection structure of the present invention is threadedly connected to the battery, which has good connection stability, facilitates module disassembly and maintenance, and is conducive to the subsequent recycling of the battery module;

[0026] 3. The battery module connection structure of the present invention uses fasteners as connecting parts, which reduces the weight of the connecting parts, helps reduce the overall weight of the battery module, and helps improve the weight energy density of the battery module;

[0027] 4. The battery module connection structure of the present invention uses fasteners as connectors. Under high-rate operating conditions, the diameter and length of the fasteners can be increased while slightly increasing the mass of the battery module, thereby improving the weight energy density of the high-rate battery module.

[0028] 5. The battery module connection structure of the present invention uses fasteners as connectors. In high-rate battery modules, the diameter of the fasteners can be increased to enhance the stability of the connection.

[0029] 6. In the battery module connection structure of the present invention, the hollow interior of the fastener is configured as a non-circular structure as a force-applying portion, which does not occupy height space, and the force-applying component is not disposed inside the battery module, thereby improving the volume energy density of the battery module;

[0030] 7. The present invention arranges the outer end surface of the overlapping portion of the fastener and the outer surface of the connecting piece body on the same plane, thereby facilitating inspection and preventing the fastener from being subjected to external forces and causing torque attenuation;

[0031] 8. The electrical connection portion of the connecting piece of the present invention can be realized in a variety of structural forms, making it easy to select a more appropriate form according to actual needs to meet the requirements of electrical performance and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1is a schematic diagram of the battery module structure of Example 1 of the present invention;

[0034] Figure 2 1 is a schematic diagram of the three-dimensional structure of the fastener according to Example 1 of the present invention;

[0035] Figure 3 is a schematic cross-sectional view of a fastener according to Example 1 of the present invention;

[0036] Figure 4 This is a schematic diagram of the three-dimensional structure of the connecting piece of Example 1 of the present invention;

[0037] Figure 5 is a schematic cross-sectional structural diagram of a connecting piece according to embodiment 1 of the present invention;

[0038] Figure 6 1 is a schematic structural diagram of the buffer portion of the connecting piece of Example 1 of the present invention;

[0039] Figure 7 is another structural schematic diagram of the buffer portion of the connecting piece of Example 1 of the present invention;

[0040] Figure 8 1 is a schematic diagram of the assembly structure of the battery connection structure of Example 1 of the present invention;

[0041] Figure 9 is a schematic cross-sectional structural diagram of a connecting piece according to embodiment 2 of the present invention;

[0042] Figure 10 It is a schematic diagram of the cross-sectional structure of the connecting piece of Example 3 of the present invention.

[0043] In the figure, 1-fastener, 11-hole, 12-external thread, 13-overlapping portion, 14-extension portion, 2-connecting plate, 20-connecting plate body, 201-buffering portion, 21-first through hole, 22-electrical connecting portion, 23-transition portion, 231-inclined section, 232-horizontal section, 3-battery unit, 31-battery pole, 32-accommodating groove, 33-second threaded portion, 4-module. DETAILED DESCRIPTION

[0044] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0045] In the description of the present invention, it should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0046] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0048] For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0050] Example 1

[0051] A battery module, such as Figure 1 As shown, it includes multiple battery cells 3, and the multiple battery cells 3 are connected in pairs through a connection structure to form a group of series-connected battery modules 4.

[0052] The connection structure includes a fastener 1 and a connecting piece 2. The fastener 1 passes through the connecting piece 2 and is detachably connected to the battery pole 31, so that the connecting portion 22 of the connecting piece 2 is in close contact with the battery pole 31. Figure 8 As shown, electrical connection between batteries is achieved.

[0053] Specifically, the structure of the fastener 1 is as follows Figure 2 and Figure 3 As shown, it includes an extension portion 14 and a lap portion 13 (such as Figure 2As shown, the overlap portion 13 can be provided on one end of the extension portion 14, or the extension portion 14 can be slightly protruded from the overlap portion); the overlap portion 13 is similar to the brim structure of a nut, such as Figure 3 As shown; the fastener 1 is detachably connected to the battery cell pole. Specifically, the fastener 1 passes through the connecting piece 2 and is detachably connected to the battery pole 31, so that at least a portion of the electrical connection portion 22 is located between the overlapping portion 13 and the outer end surface of the battery pole 31. That is, the electrical connection portion 22 can be entirely located between the overlapping portion 13 and the outer end surface of the battery pole 31, or partially located between the overlapping portion 13 and the outer end surface of the battery pole 31 (as shown in FIG. Figure 8 As shown), that is, the cross-sectional width of the overlapping portion is equal to or smaller than the cross-sectional width of the electrical connection portion 22.

[0054] In the embodiment of the present invention, at least a portion of the electrical connection portion is located between the overlap portion and the outer end surface of the battery terminal. That is, the fastener provides a force to make the connecting piece close to the battery terminal, and this force can achieve a stable connection between the connecting piece and the battery terminal. Specifically, the force provided by the fastener makes the connecting piece and the battery terminal fit tightly to attach. Figure 8 For example, the force provided by the fastener is perpendicular to the surface of the connecting piece and downward, and the battery post is located below the connecting piece. However, in one connection structure of patent CN201210104195.5, although the force provided by the nut is perpendicular to the surface of the connecting piece and downward, the battery post is not located below the connecting piece. In another connection structure of CN201210104195.5, the connecting piece and the battery post are directly connected by threads, but the force provided by the threads between the connecting piece and the battery post is relatively small.

[0055] Therefore, the embodiment of the present invention can achieve a stable connection between the connecting piece and the battery pole;

[0056] Preferably, the extension portion 14 has an axial hole 11 therein, making the fastener 1 a hollow structure. The hollow cavity of the fastener is configured as a non-circular hole 11, which serves as a force-applying portion for placing an operating tool in the hollow cavity as a fulcrum during the fastening process of the fastener.

[0057] For example, square aluminum shell batteries have a large capacity, that is, a large discharge rate, and the connection structure has a large requirement for flow energy, so large-sized fasteners are needed for connection. The fasteners are set to a hollow structure, which improves the flow capacity of the connection without increasing the weight of the fasteners; and the diameter of the fasteners can be increased according to the requirements of the battery module to improve the stability of the electrical connection.

[0058] Preferably, the external thread 12 is provided on the outside of the extension portion 14 for threaded connection with the battery pole; or the fastener and the pole of the battery cell are detachably connected by a snap-fit structure or the like.

[0059] The hollow cavity of the fastener is set to a non-circular shape, such as a polygonal structure of an inner hexagon, an inner six-flower, an inner pentagon, an inner square, an inner triangle, etc. Those skilled in the art can understand that as the structure of the force-applying part, as long as the operating tool can form a fulcrum on it. In this way, during the assembly process, the operator uses the operating tool to apply force to drive the fastener 1 to rotate, thereby realizing the threaded connection between the external thread 12 and the battery pole. The present invention utilizes the hollow position of the fastener 1 to be set to a non-circular structure as the force-applying part. On the one hand, it avoids the traditional screw nut as an independent solid part, occupying the height space of the module; on the other hand, the use of this structure does not require the force-applying operating tool to be set in the battery module, thereby reducing the weight of the battery module.

[0060] The structure of the connecting piece 2 is as follows Figure 4 and Figure 5 As shown, the connecting piece includes two electrical connection parts 22, which are respectively provided at both ends of the connecting piece 2 and are used to connect the poles of two batteries. As an advantage, the two electrical connection parts 22 are symmetrically provided at both ends of the connecting piece 2 to facilitate processing and assembly.

[0061] It is worth noting that the multiple batteries in this embodiment are connected in series to form a battery module, so the connecting piece has only two electrical connectors 22. If the batteries in the module need to be connected in parallel first and then in series, the connecting piece may need to have more electrical connectors 22 (two, three, four, etc.), depending on the number of batteries connected in parallel. Alternatively, the connecting piece for connecting terminals may only need one electrical connector.

[0062] Specifically, the connecting piece 2 includes a connecting piece body 20 and an electrical connecting portion 22. The connecting piece body 20 and the electrical connecting portion 22 are connected by a transition portion 23. The electrical connecting portion 22 and the connecting piece body 20 are spaced apart in the axial direction. That is, the connecting piece body 20 and the electrical connecting portion 22 are not in the same plane. Figure 4 and Figure 5 As shown, the transition portion 23 and the electrical connection portion 22 form a concave recessed portion. The transition portion 23 includes an inclined section 231 , and two ends of the inclined section 231 are respectively connected to the electrical connection portion 22 and the connecting piece body 20 .

[0063] A first through hole 21 is also provided on the electrical connection portion 22. The first through hole 21 is used for the extension portion 14 of the fastener 1 to pass through. Therefore, the diameter of the first through hole 21 should be adapted to the size of the extension portion 14 of the fastener 1. Those skilled in the art will understand that the diameter of the first through hole 21 is slightly larger than the diameter of the extension portion 14 of the fastener 1.

[0064] The recessed portion on the connecting piece 2 is used to accommodate the overlapping portion 13 of the fastener 1. Preferably, the outer end surface of the overlapping portion 13 and the outer surface of the connecting piece body 20 are on the same plane, that is, the depth of the recessed portion is equal to the thickness of the overlapping portion 13. Therefore, during the assembly and maintenance process, if the fastener 1 is not connected to the battery pole 3 and the connecting piece, the overlapping portion 13 will exceed the horizontal height of the connecting piece body, so that the operator can easily find that the connection here is not in place, thereby facilitating inspection; at the same time, it can also prevent the fastener 1 from being subjected to external force and causing torque attenuation.

[0065] As an option, a buffer portion 201 is further provided on the connecting piece body 20, and the buffer portion 201 is located between two adjacent electrical connecting portions 22. Figure 6 As shown, the buffer portion 22 is a boss, a depression, a wave (such as Figure 7 During the connection process between the connecting piece body 20 and the battery, and during the use of the battery module, due to the inconsistent thermal expansion and contraction of each battery, the connecting piece body 20 inevitably needs to withstand uneven forces from each battery, resulting in a certain degree of deformation. The buffer portion 201 can absorb this uneven force, preventing the electrical connection portion 22 from deforming and affecting the electrical connection between the electrical connection portion 22 and the battery, thereby improving the electrical connection stability between the connecting piece body and the battery cell.

[0066] The battery cell 3 includes a battery terminal 31. In order to realize assembly with the aforementioned connection structure, a receiving groove 32 and a second threaded portion 33 arranged on the inner wall of the receiving groove are provided on the battery terminal 31. The receiving groove 32 is used to accommodate the extension 14 of the fastener 1, and the external thread 12 arranged on the outer side of the extension 14 is adapted to the second threaded portion 33 arranged on the inner wall of the receiving groove. The fastener 1 is fastened to the battery terminal through the cooperation of the external thread 12 and the second threaded portion 33. Figure 8 Of course, the connection between the extension portion 14 and the battery pole 31 can also be a detachable connection such as a snap connection.

[0067] When the battery module is assembled, Figure 8 As shown, the extension portion 14 of the fastener 1 passes through the first through-hole 21 of the connecting piece 2. The non-circular hole in the extension portion 14, i.e., the force-applying portion, is used to apply force to achieve rotation of the fastener 1, thereby cooperating with the external thread 12 and the second threaded portion 33 to achieve a tight connection. When the lap portion 13 of the fastener 1 is completely inserted into the recessed portion of the connecting piece 2 (i.e., the outer end surface of the lap portion 13 is in the same plane as the outer surface of the connecting piece body 20), the assembly of the battery cell 3 and the connection structure is completed. At this time, the lap portion 13 of the fastener 1 presses the electrical connection portion 22 of the connecting piece 2, so that the electrical connection portion 22 is in close contact with the surface of the battery terminal, thereby achieving electrical connection between the connecting piece 2 and the battery terminal, and further achieving electrical connection between the batteries.

[0068] In this embodiment, the electrical connection portion 22 and the transition portion 23 in the connecting piece 2 are an integral structure, and the connecting piece 2 is formed in one piece; the material of the connecting piece 2 is selected from a material with good conductivity, good corrosion resistance, high hardness and good surface roughness, such as copper; further, since the density and price of the pure copper material itself are high, in order to reduce cost and / or weight, nickel-plated copper can be selected as the material of the connecting piece.

[0069] Example 2

[0070] The difference between this embodiment and embodiment 1 lies in the electrical connection portion 22 on the connection piece 2 . The electrical connection portion 22 in this embodiment is an independent structure and is not integrally formed with other parts of the connection piece 2 .

[0071] Specifically, the connecting piece 2 includes a connecting piece body 20, a transition portion 23 and an electrical connection portion 22; wherein the transition portion 23 includes an inclined section 231 and a horizontal section 232, one end of the inclined section 231 is connected to the connecting piece body 20, the other end of the inclined section 231 is connected to one end of the horizontal section 232, and the other end of the horizontal section 232 is connected to the electrical connection portion 22, as shown in FIG. Figure 9 As shown, the electrical connection portion 22 is coplanar with the horizontal section 232 .

[0072] Because the electrical connector and the rest of the connecting plate do not need to be integrally formed, the material of the electrical connector can be different from that of the rest of the connecting plate. For example, the electrical connector 22 can be made of copper or nickel-plated copper, while the rest of the connecting plate can be made of aluminum. The electrical connector 22 and the horizontal section 232 of the transition portion can be welded, for example, by friction stir welding, so that the electrical connector 22 and the horizontal section 232 are coplanar.

[0073] During assembly, the overlapping portion 13 of the fastener 1 presses the electrical connection portion 22 of the connecting piece 2, so that the electrical connection portion 22 is in close contact with the surface of the battery pole, thereby achieving electrical connection between the connecting piece 2 and the battery pole, and further achieving electrical connection between batteries.

[0074] Example 3

[0075] The difference between this embodiment and the second embodiment lies in the electrical connection portion 22 on the connecting piece 2 . The electrical connection portion 22 in this embodiment is also an independent structure, but is not coplanar with the horizontal section 232 of the transition portion 23 .

[0076] Specifically, the electrical connection portion 22 is located below the bottom of the transition portion 23, that is, below the horizontal section 232. Figure 10 shown.

[0077] Since the electrical connection part in Example 2 needs to be flush with the horizontal section, the welding process has high requirements; in this embodiment, the electrical connection part is directly placed at the bottom of the horizontal section and is relatively easy to prepare by electromagnetic pulse welding (EMPT) or brazing.

[0078] Attachment Figure 10 In the embodiment, the diameter of the through hole at the center of the horizontal section 232 is slightly larger than the diameter of the through hole at the center of the electrical connection portion 22. This embodiment does not limit the structure of the electrical connection portion 22 and the horizontal section 232 of the present invention. Those skilled in the art will understand that as long as the diameters of the through holes of these two parts are slightly larger than the diameter of the extension portion 14 of the fastener 1, the relative size of the diameters of the electrical connection portion 22 and the central through hole of the horizontal section 232 does not affect the implementation of the technical solution of the present invention.

[0079] During assembly, the overlapping portion 13 of the fastener 1 presses the horizontal section 232 of the connecting piece 2, and then presses the electrical connecting portion 22, so that the electrical connecting portion 22 is in close contact with the surface of the battery pole, thereby realizing the electrical connection between the connecting piece 2 and the battery pole, and then realizing the electrical connection between the batteries.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery module connection structure, characterized in that: It includes a fastener (1) and a connecting piece (2); The fastener (1) includes an extension portion (14) and a lap portion (13), wherein the extension portion (14) has a hole (11) along its axial direction, and the lap portion (13) is arranged on the outer periphery of the extension portion (14). The extension portion (14) is provided with an external thread (12), and the external thread (12) is arranged on the outer side of the extension portion (14) away from the hole (11), and the external thread (12) is used for threaded connection with the battery pole (31); The connecting piece (2) comprises an electrical connecting portion (22), and a first through hole (21) is provided on the electrical connecting portion (22); After the extension portion (14) passes through the first through hole (21), it is detachably connected to the battery pole (31), and at least a portion of the electrical connection portion (22) is located between the overlap portion (13) and the outer end surface of the battery pole (31); The connecting piece (2) comprises a connecting piece body (20) and the electrical connecting portion (22), the electrical connecting portion (22) and the connecting piece body (20) are connected via a transition portion (23), the electrical connecting portion (22) and the connecting piece body (20) are spaced apart in the axial direction, and the outer end surface of the overlapping portion (13) and the outer surface of the connecting piece body (20) are on the same plane.

2. The battery module connection structure according to claim 1, characterized in that: The hole (11) is non-circular.

3. The battery module connection structure according to claim 1, characterized in that: The transition portion (23) comprises an inclined section (231), and two ends of the inclined section (231) are respectively connected to the electrical connection portion (22) and the connecting piece body (20).

4. The battery module connection structure according to claim 1, characterized in that: The transition portion (23) comprises an inclined section (231) and a horizontal section (232), one end of the inclined section (231) is connected to the connecting piece body (20), the other end of the inclined section (231) is connected to one end of the horizontal section (232), and the other end of the horizontal section (232) is connected to the electrical connection portion (22).

5. The battery module connection structure according to claim 1, characterized in that: The electrical connection portion (22) is located below the bottom of the transition portion (23).

6. The battery module connection structure according to claim 3, characterized in that: The electrical connection portion (22) and the transition portion (23) are integrally formed.

7. The battery module connection structure according to claim 4 or 5, characterized in that: The electrical connection portion (22) and the transition portion (23) are welded.

8. The battery module connection structure according to any one of claims 1 to 6, characterized in that: A buffer portion (201) is also provided on the connecting piece body (20), and the buffer portion (201) is located between two adjacent electrical connecting portions (22).

9. The battery module connection structure according to claim 7, characterized in that: A buffer portion (201) is also provided on the connecting piece body (20), and the buffer portion (201) is located between two adjacent electrical connecting portions (22).

10. The battery module connection structure according to claim 8, characterized in that: The buffer portion (201) is any one of a boss, a depression, and a wave, or a combination thereof.

11. The battery module connection structure according to claim 1, wherein: An external thread (12) is provided on the outside of the extension portion (14), and the external thread (12) is tightly connected to the internal thread of the battery pole.

12. A battery module, characterized in that: Comprising at least two battery cells (3), the at least two battery cells (3) are connected using the battery module connection structure according to any one of claims 1 to 11.

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