Connecting bar, battery pack and vehicle

Abstract

The utility model discloses a connecting bar, a battery pack and a vehicle. The connecting bar comprises a buffer section and two battery cell connecting sections, and the buffer section comprises at least two bending structures which are continuously arranged in the first direction; the two battery cell connecting sections are respectively arranged on two opposite sides of the buffer section in the first direction; wherein the at least two bending structures comprise at least one first bending structure and at least one second bending structure, the first bending structures and the second bending structures are arranged in a staggered mode in the first direction, and the first bending structures protrude out of one side of the battery cell connecting section in the second direction; and the second bending structure protrudes out of the other side of the battery cell connecting section in the second direction, and the first direction intersects with the second direction. The connecting bar is not prone to being damaged under the action of external force, and the connecting bar can have good working stability.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a connecting bar, a battery pack and a vehicle. Background Art

[0002] The cells in a battery pack often need to be electrically connected with a connecting bar. However, when the cell itself expands or is affected by external environment such as vibration or impact, the adjacent cells are prone to relative displacement, which can easily cause the connecting bar connected between adjacent cells to be subjected to a certain amount of tension or compression, making it easy for stress concentration to occur on the connecting bar or even fatigue fracture, reducing the working reliability of the connecting bar. Utility Model Content

[0003] The embodiments of the present application provide a connection bar, a battery pack, and a vehicle, aiming to improve the working reliability of the connection bar.

[0004] In a first aspect, an embodiment of the present application provides a connection row, comprising a buffer segment and two battery cell connection segments, the buffer segment comprising at least two bending structures continuously arranged in a first direction; the two battery cell connection segments are arranged on opposite sides of the buffer segment in the first direction; wherein the at least two bending structures include at least one first bending structure and at least one second bending structure, the first bending structure and the second bending structure are alternately arranged in the first direction, the first bending structure is arranged to protrude from one side of the battery cell connection segment in the second direction, and the second bending structure is arranged to protrude from the other side of the battery cell connection segment in the second direction, and the first direction intersects with the second direction.

[0005] According to the implementation scheme of the first aspect of the present application, at least one buffer hole is opened in the battery cell connecting section, and the size of the buffer hole in the first direction is smaller than the size of the buffer hole in the third direction, wherein the first direction, the second direction and the third direction intersect each other.

[0006] According to any of the aforementioned embodiments of the first aspect of the present application, the battery cell connecting section includes a first plate body and a second plate body stacked in the second direction, and the buffer hole is opened in the first plate body.

[0007] According to any of the aforementioned embodiments of the first aspect of the present application, the battery cell connecting segment includes a first plate body and a second plate body stacked in the second direction, the first plate body is provided with a first positioning hole extending along the second direction, the second plate body is provided with a pole welding groove and a second positioning hole extending along the second direction, and the orthographic projection of the first positioning hole corresponding to each battery cell connecting segment in the second direction is located within the orthographic projection of the pole welding groove in the second direction.

[0008] According to any of the aforementioned embodiments of the first aspect of the present application, the buffer segment includes a first buffer layer integrally connected to the first plate body, at least a portion of the first buffer layer is bent relative to the battery cell connecting segment and protrudes from the battery cell connecting segment to form at least a partially bent structure, and / or the buffer segment includes a second buffer layer integrally connected to the second plate body, at least a portion of the second buffer layer is bent relative to the battery cell connecting segment and protrudes from the battery cell connecting segment to form at least a partially bent structure.

[0009] According to any of the aforementioned embodiments of the first aspect of the present application, the battery cell connecting section also includes a bent plate body arranged at one end of the first plate body and the second plate body in the third direction, wherein the first plate body and the bent plate body are integrally formed, and the second plate body and the bent plate body are integrally formed, and the first direction, the second direction and the third direction intersect each other.

[0010] According to any of the aforementioned embodiments of the first aspect of the present application, the width of the buffer segment in the first direction is less than 0.5 times the width of the connecting row in the first direction, and the width of the buffer segment in the first direction is greater than 0.1 times the width of the connecting row in the first direction.

[0011] In a second aspect, an embodiment of the present application provides a battery pack, comprising a crossbeam, at least two battery cells, and a connecting row in any embodiment of the first aspect, wherein the crossbeam is disposed between at least two adjacent battery cells, and the battery cells on both sides of the crossbeam are electrically connected through the connecting row.

[0012] According to an implementation scheme of the second aspect of the present application, the battery cell includes a main body and a pole arranged on one side of the main body in the second direction, the two battery cell connecting sections of the connecting row are respectively connected to the poles of the two battery cells, the width of the connecting row in the first direction is less than 4 times the width of the main body in the first direction, and the width of the connecting row in the first direction is greater than 1.5 times the width of the main body in the first direction.

[0013] In a third aspect, an embodiment of the present application provides a vehicle, the vehicle comprising a battery pack according to any one of the embodiments of the second aspect, the battery pack being used to provide electrical energy.

[0014] A connection row provided in an embodiment of the present application is used to connect battery cells. The connection row includes a buffer section and two battery cell connection sections. The two battery cell connection sections are arranged on opposite sides of the buffer section in a first direction. The battery cell connection sections can be used to connect with the battery cells, so that two adjacent battery cells can be electrically connected through the connection row. The buffer section includes at least two bending structures arranged continuously in the first direction. When the connection row is subjected to a tensile force or an extrusion force, the bending structure of the connection row can be deformed well to adapt to the influence of the external force on the connection row, so that the connection row can be flattened or folded to a certain extent in the first direction, so that the connection row is not easily damaged by the external force. For example, when the connection row is connected to the battery cell, the connection row is not easily affected by the external environment such as the expansion of the battery cell or vibration, impact, etc., and has good working reliability.

[0015] Among them, at least two bending structures include at least one first bending structure and at least one second bending structure, and the first bending structure and the second bending structure are staggered in the first direction, and the first bending structure is set in the second direction. The buffer section includes at least one bending structure bent relative to the connecting section and protruding from one side of the battery cell connecting section in the second direction, and at least one bending structure is set to be bent relative to the connecting section and the second bending structure protrudes from the other side of the battery cell connecting section in the second direction, that is, by setting the battery cell connecting section on both sides in the second direction, both sides can have bending structures bent relative to the battery cell connecting section and protruding from the battery cell connecting section, so that when the battery cell connecting section moves driven by the battery cell, the first bending structure and the second bending structure located on both sides of the battery cell connecting section in the second direction can undergo relatively uniform deformation, so that the overall deformation of the buffer section in the second direction is relatively uniform, thereby being able to better improve the deformation uniformity of the connecting row, and can improve the stability of the battery cell connecting section moving in the first direction, so that the connecting row is not easily damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of the connection between the connecting bar and the battery cell in some embodiments of the present application;

[0018] Figure 2 This is a schematic diagram of the structure of the connection row of some embodiments of the present application;

[0019] Figure 3 A side view of a connection row according to some embodiments of the present application;

[0020] Figure 4 A schematic diagram of the structure of a connecting row in a state to be bent according to some embodiments of the present application;

[0021] Figure 5 Schematic diagram of the structure of the connecting row in a state to be bent according to some other embodiments of the present application;

[0022] Figure 6 A schematic diagram of the structure of a connecting row in a state to be bent according to some other embodiments of the present application;

[0023] Figure 7 An exploded schematic diagram of a battery pack according to some embodiments of the present application;

[0024] Figure 8 A schematic diagram of the partial structure of a battery pack according to some embodiments of the present application.

[0025] Description of reference numerals:

[0026] 1-Connection row;

[0027] 11-buffer section; 11a-first buffer layer; 11b-second buffer layer; 11c-initial bending structure; 11d-initial first buffer layer; 11e-initial second buffer layer; 111-bending structure; 111a-bending segment; 111b-connecting segment; 111d-first bending structure; 111e-second bending structure;

[0028] 12-cell connection section; 12a-buffer hole; 121-first plate; 121a-first positioning hole; 122-second plate; 122a-pole welding groove; 122b-second positioning hole; 123-bent plate;

[0029] 2-battery cell; 21-electrode; 22-body;

[0030] 3- beam;

[0031] X-first direction;

[0032] Y-second direction;

[0033] Z - third direction. DETAILED DESCRIPTION

[0034] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0036] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0037] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the embodiments of the present application. In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0038] The cells in a battery pack often need to be electrically connected with a connecting bar. However, when the cell itself expands or is affected by external environment such as vibration or impact, the adjacent cells are prone to relative displacement, which can easily cause the connecting bar connected between adjacent cells to be subjected to a certain amount of tension or compression, making it easy for stress concentration to occur on the connecting bar or even fatigue fracture, reducing the working reliability of the connecting bar.

[0039] In order to solve the above technical problems, the present application is provided. In order to better understand the present application, the connection bar, battery pack and vehicle of the embodiment of the present application are described in detail below in conjunction with the accompanying drawings.

[0040] Figure 1 This is a schematic diagram of the connection between the connecting bar 1 and the battery cell 2 in some embodiments of the present application. Figure 2 This is a schematic diagram of the structure of the connecting row 1 of some embodiments of the present application. Figure 3The figure is a side view of the connection row 1 of some embodiments of the present application. The X direction in the figure is the first direction X, the Y direction in the figure is the second direction Y, and the Z direction in the figure is the third direction Z, wherein the first direction X, the second direction Y and the third direction Z intersect each other.

[0041] like Figures 1 to 3 As shown, an embodiment of the present application provides a connection row 1, which includes a buffer segment 11 and two battery cell connection segments 12, the buffer segment 11 includes at least two bending structures 111 continuously arranged in a first direction X; the two battery cell connection segments 12 are arranged on two opposite sides of the buffer segment 11 in the first direction X; wherein, the at least two bending structures 111 include at least one first bending structure 111d and at least one second bending structure 111e, the first bending structure 111d and the second bending structure 111e are alternately arranged in the first direction X, the first bending structure 111d is protruding from one side of the battery cell connection segment 12 in the second direction Y, and the second bending structure 111e is protruding from the other side of the battery cell connection segment 12 in the second direction Y.

[0042] A connection bar 1 provided in an embodiment of the present application is used to connect battery cells 2. The connection bar 1 includes a buffer section 11 and two battery cell connection sections 12. The two battery cell connection sections 12 are arranged on opposite sides of the buffer section 11 in a first direction X. The battery cell connection sections 12 can be used to connect with the battery cells 2, so that two adjacent battery cells 2 can be electrically connected through the connection bar 1. The buffer section 11 includes at least two bending structures 111 arranged continuously in the first direction X, so that when the connection bar 1 is subjected to a tensile force or an extrusion force, the bending structures 111 of the connection bar 1 can be deformed well to adapt to the external force on the connection bar 1, so that the connection bar 1 can be flattened or folded to a certain extent in the first direction X, so that the connection bar 1 is not easily damaged by the external force. For example, when the connection bar 1 is connected to the battery cell 2, the connection bar 1 is not easily affected by the external environment such as the expansion, vibration, and impact of the battery cell 2, and has good working reliability.

[0043] Among them, at least two bending structures 111 include at least one first bending structure 111d and at least one second bending structure 111e, by arranging the first bending structure 111d and the second bending structure 111e to be staggered in the first direction X, and arranging the first bending structure 111d to protrude from one side of the battery cell connecting section 12 in the second direction Y, and arranging the second bending structure 111e to protrude from the other side of the battery cell connecting section 12 in the second direction Y, that is, by arranging the battery cell connecting section 12 on both sides in the second direction Y, both sides can have a relative position to the battery cell connecting section 12. The segment 12 is bent and protrudes from the bending structure 111 set in the battery cell connecting segment 12, so that when the battery cell connecting segment 12 moves driven by the battery cell 2, the first bending structure 111d and the second bending structure 111e located on both sides of the battery cell connecting segment 12 in the second direction Y can undergo relatively uniform deformation, so that the overall deformation of the buffer segment 11 in the second direction Y is relatively uniform, thereby better improving the deformation uniformity of the connecting row 1, and improving the stability of the battery cell connecting segment 12 moving in the first direction X, so that the connecting row 1 is not easily damaged.

[0044] Furthermore, when there is a crossbeam 3 between two adjacent battery cells 2, the two battery cells 2 are likely to have a larger spacing due to the arrangement of the crossbeam 3, so that the connection row 1 needs to have a larger span in the first direction X to facilitate connecting the battery cells on both sides of the crossbeam 3. Therefore, by providing the battery cell connection section 12 with a first bending structure 111d and a second bending structure 111e that are bent relative to the battery cell connection section 12 and protrude from the battery cell connection section 12 on both sides in the second direction Y, the connection row 1 has a better structural strength in the second direction Y, and the connection row 1 is not likely to collapse along the second direction Y due to an excessively large span, thereby being able to better improve the working reliability of the connection row 1. In addition, when the battery cell 2 gradually moves away from the beam 2 due to expansion or due to the influence of external environment such as vibration and impact, by setting the number of bending structures 111 on the buffer segment 11 to at least two, the deformable amount of the buffer segment 11 in the first direction X can be better improved to adapt to the larger stretching caused by the movement of the battery cell 2 away from the beam 3, so that the connecting row 1 with a larger span is not easily broken.

[0045] like Figure 3 As shown, in some embodiments of the present application, the first bending structure 111d and the second bending structure 111e are bent relative to the battery cell connecting segment 12 and protrude from the battery cell connecting segment 12, which may mean that the first bending structure 111d and the second bending structure 111e can be bent relative to the battery cell connecting segment 12 to form an arch shape, so that when an external force acts on the connecting row 1, the first bending structure 111d and the second bending structure 111e of the connecting row 1 can be better deformed to adapt to the influence of the external force on the connecting row 1.

[0046] For example, the first bending structure 111d and the second bending structure 111e may each include at least two bending segments 111a bent relative to the battery cell connecting segment 12 and a connecting segment 111b connected between adjacent bending segments 111a. When the battery cell connecting segment 12 connected to the battery cell 2 moves toward the side away from the buffer segment 11 under the action of the tension provided by the battery cell 2, driven by the battery cell connecting segment 12, the bending segments 111a located on both sides of the connecting segment 111b in the first bending structure 111d and the second bending structure 111e may move away from each other, so that the bending structure 111 may be gradually flattened to buffer the direct impact of the tension on the bending structure 111, so that the connecting row 1 is not easily damaged under the action of the tension, thereby better improving the working reliability of the connecting row 1. When the battery cell connecting segment 12 connected to the battery cell 2 moves toward the side close to the buffer segment 11 under the action of the extrusion pressure provided by the battery cell 2, driven by the battery cell connecting segment 12, the bending segments 111a located on both sides of the connecting segment 111b in the first bending structure 111d and the second bending structure 111e can approach each other, so that the arching degree of the bending structure 111 can be aggravated, so as to buffer the direct extrusion effect of the extrusion pressure on the bending structure 111, so that the connecting row 1 is not easily damaged under the action of the extrusion pressure, so as to better improve the working reliability of the connecting row 1.

[0047] Optionally, there are various ways to form the bending structure 111. For example, the bending structure 111 can be formed by stamping or by bending in a certain direction.

[0048] Optionally, the connecting segment 111b can be arranged parallel to the battery cell connecting segment 12, so that the bending structure 111 is not likely to protrude too much from the battery cell connecting segment 12, thereby effectively reducing the influence of the bending structure 111 on the arrangement of the battery cell 2 when the connecting row 1 is connected to the battery cell 2.

[0049] The present application does not limit the number of the first bending structure 111d and the second bending structure 111e. The number of the first bending structure 111d and the second bending structure 111e can be set according to the actual expandability of the battery cell 2 and the degree of external forces such as vibration and impact on the battery cell 2.

[0050] In some optional embodiments, multiple bending structures 111 are arranged to be continuous in the first direction X, for example, the first bending structure 111d and the second bending structure 111e are continuous in the first direction X, and the first bending structure 111d and the second bending structure 111e are respectively bent relative to the battery cell connecting section 12 on both sides in the second direction Y and protrude from the battery cell connecting section 12, so that when the connecting row 1 is subjected to a force in the first direction X, the first bending structure 111d and the second bending structure 111e can be deformed at the same time, so that the connecting row 1 can have better deformation ability in the first direction X to buffer the influence of external force on the connecting row 1, so as to better improve the working reliability of the connecting row 1.

[0051] Optionally, the protrusion heights of each bending structure 111 relative to the battery cell connection segment 12 in the second direction Y may be the same, so as to further improve the deformation uniformity of the connection row 1 when each bending structure 111 is deformed. For example, the protrusion heights of each first bending structure 111d relative to the battery cell connection segment 12 may be the same, and / or, the protrusion heights of each second bending structure 111e relative to the battery cell connection segment 12 may be the same, and / or, the protrusion heights of the first bending structure 111d and the second bending structure 111e relative to the battery cell connection segment 12 may be the same.

[0052] In some optional embodiments, such as Figure 3 As shown, the number of the first bending structure 111d in the connecting row 1 can be one, the number of the second bending structure 111e in the connecting row 1 can be two, the first bending structure 111d can be located at the center of two adjacent battery cells 2, and the second bending structure 111e can be symmetrically distributed on both sides of the first bending structure 111d in the first direction X, so that when the buffer segment 11 of the connecting row 1 is deformed under force, the buffer segment 11 can have better deformation uniformity.

[0053] Figure 4 It is a schematic structural diagram of a connecting bar 1 in a state to be bent according to some embodiments of the present application.

[0054] like Figure 4 As shown, in some optional embodiments, the battery cell connecting segment 12 is provided with at least one buffer hole 12a, and the size of the buffer hole 12a in the first direction X is smaller than the size of the buffer hole 12a in the third direction Z.

[0055] Optionally, the size of the buffer hole 12a in the first direction X is smaller than the size of the buffer hole 12a in the third direction Z, which may mean that the length direction of the buffer hole 12a may be the first direction X, the width direction of the buffer hole 12a may be the third direction Z, and the length of the buffer hole 12a may be greater than the width, so that the projection of the buffer hole 12a in the second direction Y may be slender.

[0056] In these optional embodiments, by setting the size of the buffer hole 12a in the first direction X to be smaller than the size of the buffer hole 12a in the third direction Z, when the connecting row 1 is subjected to tension or extrusion force, the buffer hole 12a is easy to deform in the first direction X to better adapt to the influence of the external force on the connecting row 1, so that the connecting row 1 can be more easily flattened to a certain extent in the first direction X.

[0057] Figure 5 Schematic diagram of the structure of the connecting bar 1 in a state to be bent according to some other embodiments of the present application.

[0058] like Figure 4 and Figure 5 As shown, optionally, there are various ways to set the shape of the buffer hole 12a. The projection of the buffer hole 12a in the second direction Y may be an ellipse, or the buffer hole 12a may be a waist-shaped hole, which is not specifically limited in the present application.

[0059] Optionally, the buffer holes 12 a may be disposed on both sides of the buffer segment 11 in the first direction X, so as to further improve the deformation uniformity of the connecting row 1 when the connecting row 1 is deformed.

[0060] In some embodiments of the present application, the battery cell connecting segment 12 is used to connect with the battery cell 2, which may specifically refer to the battery cell connecting segment 12 being used to electrically connect with the battery cell 2. For example, the battery cell connecting segment 12 can be used to electrically connect with the pole 21 of the battery cell 2, so that when the two battery cell connecting segments 12 of the connecting row 1 are respectively connected to the two battery cells 2, the two battery cells 2 can be electrically connected through the connecting row 1.

[0061] In some embodiments of the present application, there are multiple ways to connect the battery cell connecting segment 12 to the battery cell 2. Optionally, the battery cell connecting segment 12 can be welded to the battery cell 2. For example, the battery cell connecting segment 12 can be welded to the pole 21 of the battery cell 2.

[0062] In some optional embodiments, the battery cell connecting section 12 may include a first plate body 121 and a second plate body 122 stacked in the second direction Y, and the buffer hole 12a may be opened in the first plate body.

[0063] In this optional embodiment, the first plate 121 in the cell connection section 12 can be used to connect with the cell 2. When the cell connection section 12 is connected with the cell 2, the first plate 121 is located on the side of the second plate 122 facing the cell 2 and is attached to the cell 2. Therefore, when adjacent cells 2 move relative to each other, the first plate 121 connected with the cell 2 is more likely to deform more than the second plate 122. Therefore, by only providing the buffer hole 12a in the first plate 121, the buffer hole 12a is easily deformed in the first direction X to better adapt to the external force on the first plate 121, so that the first plate 121 can be easily flattened to a certain extent in the first direction X. In addition, since the buffer hole 12a is not provided on the second plate 122, the buffer hole 12a provided on the connection bar 1 is not likely to have an excessively large size, so that the buffer hole 12a is not likely to affect the resistance of the connection bar 1 to a large extent, and the current carrying capacity of the connection bar 1 can be better improved.

[0064] In some optional embodiments, the second plate body 122 is provided with a pole welding groove 122 a penetrating along the second direction Y.

[0065] Optionally, at least a portion of the first plate body 121 is exposed from the pole welding groove 122a.

[0066] In this optional embodiment, by setting a pole welding groove 122a on the second plate 122, the connection row 1 corresponding to the pole welding groove 122a can have a thinner thickness, so that the portion of the first plate 121 exposed from the pole welding groove 122a can be used for welding with the battery cell 2, that is, the portion of the first plate 121 not covered by the second plate 122 at the pole welding groove 122a can be used for welding with the battery cell 2, which can effectively reduce the difficulty of welding the connection row 1 and the battery cell 2. By setting the battery cell connecting section 12 to include a first plate body 121 and a second plate body 122 stacked in the second direction Y, the battery cell connecting section 12 can have good structural strength and the first plate body 121 and the second plate body 122 can be processed separately. Specifically, when it is necessary to open a pole welding groove 122a on the connecting row 1 to facilitate welding, only the second plate body 122 can be punched to form the pole welding groove 122a, and then the second plate body 122 is set on one side of the first plate body 121 in the second direction Y, so that at least part of the first plate body 121 is exposed from the pole welding groove 122a, thereby eliminating the need to prepare non-through holes that are difficult to form on the connecting row 1, which can effectively reduce the difficulty of preparing the connecting row 1.

[0067] In some optional embodiments, the first plate body 121 is provided with a first positioning hole 121a extending through the second direction Y, and the orthographic projection of the first positioning hole 121a corresponding to each battery cell connecting segment 12 in the second direction Y is located within the orthographic projection of the pole welding groove 122a in the second direction Y, so that at least part of the first positioning hole 121a is exposed from the pole welding groove 122a. The first positioning hole 121a exposed from the pole welding groove 122a can facilitate the operator to observe the relative position between the connecting row 1 and the pole 21 of the battery cell 2, thereby better improving the alignment efficiency between the connecting row 1 and the pole 21. Among them, the first positioning hole 121a opened on the first plate body 121 can also be formed when the first plate body 121 is punched, and then the second plate body 122 is arranged on one side of the first plate body 121 in the second direction Y, so that at least part of the first positioning hole 121a is exposed from the pole welding groove 122a, thereby eliminating the need to prepare the stepped pole welding groove 122a and the first positioning hole 121a that are difficult to form on the connecting bar 1, which can effectively reduce the difficulty of preparing the connecting bar 1.

[0068] Optionally, the size of the pole welding groove 122a is larger than the size of the first positioning hole 121a, so that the first plate body 121 around the first positioning hole 121a can be exposed from the pole welding groove 122a to facilitate welding.

[0069] In some optional embodiments, a second positioning hole 122 b penetrating along the second direction Y is further formed on the second plate body 122 .

[0070] Optionally, the second positioning hole 122 b may be opened at the edge of the second plate body 122 .

[0071] In these optional embodiments, the second positioning holes 122 b formed in the second plate body 122 can be used as an alignment reference to further facilitate the relative positioning between the connecting bar 1 and the battery cell 2 .

[0072] Optionally, at least a portion of the first plate 121 may be exposed from the second positioning hole 122b, so that a device for collecting the voltage of the battery cell 2 may be disposed in the second positioning hole 122b and connected to the portion of the first plate 121 exposed from the second positioning hole 122b, so that the device for collecting the voltage of the battery cell 2 is not likely to excessively protrude from the connection row 1 in the second direction Y, thereby being able to better improve the compactness of the structure. Among them, the second positioning hole 122b opened in the second plate 122 may also be formed when the second plate 122 is punched, and then the second plate 122 is disposed on one side of the first plate 121 in the second direction Y, so that at least a portion of the first plate 121 is exposed from the second positioning hole 122b, thereby eliminating the need to prepare non-through holes that are difficult to form on the connection row 1, and being able to better reduce the difficulty of preparing the connection row 1.

[0073] In some embodiments of the present application, there are multiple ways to connect the first plate 121 and the second plate 122. In some optional embodiments, the first plate 121 can be welded to the second plate 122 to achieve the connection between the first plate 121 and the second plate 122.

[0074] In some other optional embodiments, please refer to Figures 1 to 5 The battery cell connecting section 12 also includes a bent plate 123 disposed at one end of the first plate 121 and the second plate 122 in the third direction Z, wherein the first plate 121 and the bent plate 123 are integrally formed, and the second plate 122 and the bent plate 123 are integrally formed.

[0075] By arranging the first plate body 121 and the bent plate body 123 to be integrally formed, and the second plate body 122 and the bent plate body 123 to be integrally formed, the first plate body 121 and the second plate body 122 can be made of a whole plate through stamping and bending processes. Specifically, the plate material can be first subjected to a stamping process to form a first plate body 121, a second plate body 122 and a bent plate body 123 in a state to be bent, wherein the first plate body 121 in a state to be bent has a penetrating buffer hole 12a and a first positioning hole 121a, and the second plate body 122 in a state to be bent has a penetrating pole welding groove 122a and a second positioning hole 122b, and then the first plate body 121 to be bent and the second plate body 122 to be bent are bent at the position of the bent plate body 123 to be bent to form a stacked first plate body 121 and a second plate body 122, thereby effectively reducing the processing difficulty between the first plate body 121 and the second plate body 122.

[0076] In some embodiments of the present application, there are multiple ways to connect the cell connection segment 12 and the buffer segment 11. In some optional embodiments, the cell connection segment 12 can be welded to the buffer segment 11 to achieve the connection between the cell connection segment 12 and the buffer segment 11.

[0077] In some other optional embodiments, please continue to refer to Figures 1 to 5 The buffer segment 11 includes a first buffer layer 11a integrally connected to the first plate body 121, at least a portion of the first buffer layer 11a is bent relative to the battery cell connecting segment 12 and protrudes from the battery cell connecting segment 12 to form at least a portion of the bent structure 111, and / or, the buffer segment 11 includes a second buffer layer 11b integrally connected to the second plate body 122, at least a portion of the second buffer layer 11b is bent relative to the battery cell connecting segment 12 and protrudes from the battery cell connecting segment 12 to form at least a portion of the bent structure 111.

[0078] Optionally, the first buffer layer 11 a and the second buffer layer 11 b may be stacked in the second direction Y.

[0079] In these optional embodiments, there are multiple ways for the first buffer layer 11a and the second buffer layer 11b to form the bent structure 111. In some optional embodiments, the first buffer layer 11a can be bent relative to the cell connection segment 12 toward the side away from the second buffer layer 11b and protrude from the cell connection segment 12, that is, the portion of the first buffer layer 11a that is bent and protrudes relative to the cell connection segment 12 can constitute a bent structure 111 alone. The second buffer layer 11b can also be bent relative to the cell connection segment 12 toward the side away from the first buffer layer 11a and protrude from the cell connection segment 12, that is, the portion of the second buffer layer 11b that is bent and protrudes relative to the cell connection segment 12 can also constitute a bent structure 111 alone.

[0080] In some other optional embodiments, Figures 1 to 3 As shown, part of the first buffer layer 11a and part of the second buffer layer 11b constituting the same bending structure 111 are bent toward the same side relative to the battery cell connecting section 12 and protrude from the battery cell connecting section 12, that is, the single bending structure 111 is composed of part of the first buffer layer 11a and part of the second buffer layer 11b that are bent and protrude relative to the battery cell connecting section 12, so that the bending structure 111 can be formed by performing stamping treatment in the same direction on part of the first buffer layer 11a and part of the second buffer layer 11b at the same time, thereby reducing the difficulty of processing the bending structure 111 and improving the processing efficiency of the connecting row 1.

[0081] By arranging the first buffer layer 11a and the first plate body 121 to be integrally formed, and the second buffer layer 11b and the second plate body 122 to be integrally formed, the connection row 1 can be made of a whole plate through stamping and bending processes. Specifically, the plate material may be first subjected to a stamping process to form a connecting row 1 in a state to be bent, wherein, on the connecting row 1 in a state to be bent, the first plate body 121 in a state to be bent has a penetrating buffer hole 12a and a first positioning hole 121a, and the second plate body 122 in a state to be bent has a penetrating pole welding groove 122a and a second positioning hole 122b, and then the connecting row 1 in a state to be bent is bent at the position of the bent plate body 123 in a state to be bent, that is, the first plate body 121 in a state to be bent and the second plate body 122 in a state to be bent are bent, and the first buffer layer 11a in a state to be bent and the second buffer layer 11b in a state to be bent are bent to form a stacked first plate body 121 and a second plate body 122 and a stacked first buffer layer 11a and a second buffer layer 11b, thereby reducing the processing difficulty of the connecting row 1.

[0082] In this optional embodiment, in the preparation process of the connecting bar 1, there are many ways to set the molding process sequence of the bending structure 111. In some optional embodiments, such as Figure 5 As shown, the bending structure 111 can be formed when the plate is subjected to a stamping process, that is, the plate is subjected to a stamping process to stamp out an initial bending structure 11c on the first buffer layer 11a in a state to be bent and the second buffer layer 11b in a state to be bent, and then the connecting row 1 in a state to be bent is bent so that the two initial bending structures 11c are stacked to form the bending structure 111, thereby realizing the forming of the bending structure 111.

[0083] Figure 6 Schematic diagram of the structure of the connecting bar 1 in a state to be bent according to some other embodiments of the present application.

[0084] In some other optional embodiments, Figure 2 and Figure 6 As shown, the bending structure 111 can be formed after the connecting row 1 in the state to be bent is bent, that is, the plate is firstly subjected to a stamping process to form the first positioning hole 121a, the pole welding groove 122a and the second positioning hole 122b, and then the connecting row 1 in the state to be bent is subjected to a stamping process to form the bending structure 111 after being bent, that is, the stacked initial first buffer layer 11d to be stamped and the initial second buffer layer 11e to be stamped are stamped to form the bending structure 111, thereby realizing the preparation of the connecting row 1.

[0085] Figure 7 This is a schematic diagram of an explosion of a battery pack according to some embodiments of the present application. Figure 8 A schematic diagram of the partial structure of a battery pack according to some embodiments of the present application.

[0086] like Figure 7 and Figure 8 As shown, according to some embodiments of the present application, the present application also provides a battery pack, which includes a crossbeam 3, at least two battery cells 2 and a connecting row 1 in any of the aforementioned embodiments, the crossbeam 3 is arranged between at least two adjacent battery cells 2, and the battery cells 2 located on both sides of the crossbeam 3 are electrically connected through the connecting row 1.

[0087] In this optional embodiment, due to the influence of the crossbeam 3, the distance between the battery cells 2 on both sides of the crossbeam 3 is relatively large, and the battery cells 2 on both sides of the crossbeam 3 are prone to relative displacement, so that the connection row 1 needs to have a large span in the first direction X to facilitate connecting the battery cells on both sides of the crossbeam 3. Therefore, by setting the battery cells 2 on both sides of the crossbeam 3 to be connected through the connection row 1 in any of the above embodiments, when the battery cells 2 on both sides of the crossbeam 3 expand or are affected by external environments such as vibration and impact, the connection row 1 has a good structural strength in the second direction Y, so that the connection row 1 is not easy to collapse along the second direction Y due to the large span, thereby being able to better improve the working reliability of the connection row 1. In addition, when the battery cell 2 gradually moves away from the beam 2 due to expansion or due to the influence of external environment such as vibration and impact, by setting the number of bending structures 111 on the buffer segment 11 to at least two, the deformable amount of the buffer segment 11 in the first direction X can be better improved to adapt to the larger stretching caused by the movement of the battery cell 2 away from the beam 3, so that the bending structure 111 of the connecting row 1 can be better deformed to adapt to the influence of external force on the connecting row 1, so that the connecting row 1 is not easily damaged by the action of external force, so that the electrical connection relationship between the battery cells 2 on both sides of the beam 3 can be better maintained, and the working reliability of the battery pack can be better improved.

[0088] In some optional embodiments, the height of the pole 21 of the battery cell 2 in the first direction X may be H1, and the thickness of the connecting bar 1 may be H2. For example, the thickness of the battery cell connecting section 12 of the connecting bar 1 may be H2. The relationship between H1 and H2 may be set to satisfy: 0.2H1<H2≤5mm, so that the connecting bar 1 is not likely to have too small a thickness, so that the connecting bar 1 can have better structural strength, and the connecting bar 1 will not have too large a thickness, so as to facilitate welding of the connecting bar 1 and the pole 21.

[0089] In some optional embodiments, the battery cell 2 may include a main body 22 and a pole 21 arranged on one side of the main body 22 in the second direction Y, and the two battery cell connecting sections 12 of the connecting row 1 are respectively connected to the poles 21 of the two battery cells 2.

[0090] Optionally, the height of the main body 22 of the battery cell 2 in the first direction X may be H, and the minimum distance between the buffer section 11 located above the crossbeam 3 and the crossbeam 3 is H3. The relationship between H, H2 and H3 may be set to satisfy: H2<H3<0.5H, so that the buffer section 11 is not likely to be too close to the crossbeam 3, so that the connection row 1 is not likely to collide with the crossbeam 3, thereby improving the structural stability of the battery pack.

[0091] Optionally, the width of the second bending structure 111e in the first direction X is L1, and the width of the first bending structure 111d in the first direction X is L2. By setting L2≥L1, the first bending structure 111d can produce more deformation than the second bending structure 111e to adapt to the influence of external force, so that the first bending structure 111d at the center position of the buffer segment 11 can have better deformability, so that when the second bending structure 111e is stretched or compressed to the point where it cannot be deformed, the first bending structure 111d can still undergo a certain deformation.

[0092] Optionally, the width of the buffer segment 11 in the first direction X is L3, and the relationship between L2 and L3 can be set to satisfy 0.2L3<L2<0.5L3 to further enhance the deformability of the first bending structure 111d.

[0093] In some optional embodiments, the width of the buffer segment 11 in the first direction X is less than 0.5 times the width of the connecting row 1 in the first direction X, and the width of the buffer segment 11 in the first direction X is greater than 0.1 times the width of the connecting row 1 in the first direction X.

[0094] For example, the width of the connecting row 1 in the first direction X is L4. By setting 0.1L4<L3<0.5L4, the buffer segment 11 is not likely to have an excessively large width dimension, so that the connecting row 1 can have better structural strength. The buffer segment 11 is also not likely to have an excessively small width dimension, so that the buffer segment 11 can have better deformability, and the connecting row 1 is not likely to be damaged by external force.

[0095] In some optional embodiments, the width of the connection row 1 in the first direction X is less than 4 times the width of the main body 22 in the first direction X, and the width of the connection row 1 in the first direction X is greater than 1.5 times the width of the main body 22 in the first direction X.

[0096] For example, the width of the main body 22 of the battery cell 2 in the first direction X is D. By setting 1.5D<L4<4D, the connection row 1 is not likely to have too large a width and there is not likely to be too large a gap between adjacent battery cells 2, so that the connection row 1 can have better structural strength and is not likely to collapse.

[0097] According to some embodiments of the present application, the present application also provides a vehicle, the vehicle comprising the battery pack in any embodiment of the aforementioned second aspect, the battery pack being used to provide electrical energy.

[0098] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A connecting bar, characterized in that: include: The buffer section comprises at least two bending structures arranged continuously in a first direction; Two battery cell connection sections, the two battery cell connection sections are arranged on two opposite sides of the buffer section in the first direction; Among them, the at least two bending structures include at least one first bending structure and at least one second bending structure, the first bending structure and the second bending structure are arranged alternately in the first direction, the first bending structure is arranged to protrude from one side of the battery cell connecting section in the second direction, and the second bending structure is arranged to protrude from the other side of the battery cell connecting section in the second direction, and the first direction intersects with the second direction.

2. The connecting bar according to claim 1, characterized in that: The battery cell connecting section is provided with at least one buffer hole, wherein a size of the buffer hole in the first direction is smaller than a size of the buffer hole in the third direction, wherein the first direction, the second direction and the third direction intersect each other.

3. The connecting bar according to claim 2, characterized in that: The cell connecting section includes a first plate body and a second plate body stacked in the second direction, and the buffer hole is opened in the first plate body.

4. The connecting bar according to any one of claims 1 to 3, characterized in that: The battery cell connecting segment includes a first plate body and a second plate body stacked in the second direction, the first plate body is provided with a first positioning hole extending along the second direction, the second plate body is provided with a pole welding groove and a second positioning hole extending along the second direction, and the orthographic projection of the first positioning hole corresponding to each battery cell connecting segment in the second direction is located within the orthographic projection of the pole welding groove in the second direction.

5. The connecting bar according to claim 4, characterized in that: The buffer segment includes a first buffer layer integrally connected to the first plate body, at least a portion of the first buffer layer is bent relative to the battery cell connection segment and protrudes from the battery cell connection segment to form at least a partially bent structure, and / or the buffer segment includes a second buffer layer integrally connected to the second plate body, at least a portion of the second buffer layer is bent relative to the battery cell connection segment and protrudes from the battery cell connection segment to form at least a partially bent structure.

6. The connecting bar according to claim 4, characterized in that: The battery cell connecting section also includes a bent plate body arranged at one end of the first plate body and the second plate body in the third direction, wherein the first plate body and the bent plate body are integrally formed, and the second plate body and the bent plate body are integrally formed, and the first direction, the second direction and the third direction intersect each other.

7. The connecting bar according to any one of claims 1 to 3, characterized in that: The width of the buffer segment in the first direction is less than 0.5 times the width of the connecting bar in the first direction, and the width of the buffer segment in the first direction is greater than 0.1 times the width of the connecting bar in the first direction.

8. A battery pack, characterized in that: include: At least two cells; The connecting bar according to any one of claims 1 to 7; A crossbeam is disposed between at least two adjacent battery cells, and the battery cells on both sides of the crossbeam are electrically connected via the connecting row.

9. The battery pack according to claim 8, characterized in that: The battery cell includes a main body and a pole arranged on one side of the main body in the second direction, the two battery cell connecting sections of the connecting row are respectively connected to the poles of the two battery cells, the width of the connecting row in the first direction is less than 4 times the width of the main body in the first direction, and the width of the connecting row in the first direction is greater than 1.5 times the width of the main body in the first direction.

10. A vehicle, characterized in that: Comprising a battery pack as described in any one of claims 8 or 9, wherein the battery pack is used to provide electrical energy.

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