CN105406013B - Connector of power batteries, power battery module, power battery pack and automobile - Google Patents

Abstract

The invention discloses a connector for a power battery, a power battery module, a power battery pack and an automobile provided therewith. out of each main plane, the connecting piece includes a first fixing piece, n intermediate pieces and a second fixing piece, the first fixing piece is used to connect with the first power battery, and the second fixing piece is used to connect with the second power battery , n is a positive integer greater than or equal to 2; the main plane of the first fixed piece and the main plane of the first intermediate piece intersect with the main planes of the nth middle piece to the second middle piece, and the nth middle piece to the second middle piece The main planes of adjacent intermediate sheets in the second intermediate sheet intersect each other and the intersection lines are parallel to each other, and the intersection line between the second fixed sheet and the nth intermediate sheet is the same as that between the nth intermediate sheet and the adjacent middle of the second intermediate sheet. The intersection lines of the principal planes of the slices are parallel.

Description

Power battery connectors, power battery modules, power battery packs, automobiles

technical field

The present invention relates to the technical field of power batteries, and more specifically, to a power battery connector, a power battery module, a power battery pack and an electric vehicle.

Background technique

The power battery modules in the power battery pack are usually connected by copper or aluminum braided wires, laminated guide bars, flat connecting pieces or arched connecting pieces. Although the braided wire is flexible, it needs to press the connection end at the end of the braided wire, which results in a large contact internal resistance at the connection end, and in the case of frequent vibration and complicated working conditions, the reliability is low, and it occupies a large area in the length direction. big space. The structure of the laminated guide bar requires dozens or even dozens of layers of copper foil or aluminum foil, and more than a dozen or dozens of layers of aluminum foil and copper foil are pressed together at both ends of the guide bar. The number of layers is large, the contact internal resistance at both ends of the laminated guide bar is large, and it is usually only suitable for one-dimensional flexible deformation, and it is difficult to achieve three-dimensional flexibility. In addition, the manufacturing process of the laminated guide bar is complicated and the cost is high. Flat or arched connecting pieces have poor flexibility and vibration resistance, and are prone to fatigue and fracture.

Contents of the invention

The present invention aims to solve one of the above-mentioned technical problems at least to a certain extent.

Therefore, the present invention proposes a power battery connector, which has a simple structure, convenient connection and preparation, small space occupation and high reliability.

The present invention also proposes a power battery module having the above-mentioned power battery connector.

The present invention also proposes a power battery pack having the above-mentioned power battery connector.

The present invention also proposes an automobile with the above-mentioned power battery pack.

The power battery connector according to the embodiment of the first aspect of the present invention includes: a plurality of connecting pieces, the connecting pieces are sequentially connected to form a three-dimensional structure, each connecting piece defines a respective main plane, and the connecting pieces It includes a first fixing piece, n intermediate pieces and a second fixing piece, the first fixing piece is used to connect with the first power battery, the second fixing piece is used to connect with the second power battery, n is greater than or equal to 2 A positive integer; the first intermediate sheet of the n intermediate sheets is connected to the first fixed sheet and the main plane of the first intermediate sheet is coplanar with the main plane of the first fixed sheet, the n The nth middle piece of the first middle piece is connected with the second fixed piece, and the n middle pieces are sequentially connected by bending; the main plane of the first fixed piece and the main plane of the first middle piece Intersect with the main planes of the nth intermediate sheet to the second intermediate sheet, the main planes of the adjacent intermediate sheets in the nth intermediate sheet to the second intermediate sheet intersect each other and the intersection lines are parallel to each other, so The line of intersection between the second fixing piece and the n-th middle piece is parallel to the line of intersection between the n-th middle piece and the main planes of adjacent middle pieces in the second middle piece.

According to the power battery connector of the embodiment of the present invention, the first fixing piece, the second fixing piece and n intermediate pieces are sequentially connected by bending in at least two directions, and the first fixing piece, the second fixing piece and the The intersecting middle pieces form a connection structure with cushioning in three directions, which makes the connector flexible in three directions, greatly improving the reliability of the connector against vibration. The connector has a simple structure, takes up little space, and is easy to prepare. The cost is low, and instead of the braided wire structure, there is no need to crimp the wire at the connection, which reduces the contact resistance.

The power battery module according to the embodiment of the second aspect of the present invention includes a plurality of power batteries, and the adjacent power batteries are connected through the connectors of the power batteries according to the above embodiments.

The power battery pack according to the embodiment of the third aspect of the present invention includes a plurality of power battery modules, and the adjacent power battery modules are connected through the power battery connectors according to the above embodiments.

The automobile according to the embodiment of the fourth aspect of the present invention includes the power battery pack according to the above embodiment.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is a schematic diagram of a connector structure of a power battery according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of a connector structure of a power battery according to another embodiment of the present invention;

Fig. 3 is an assembly diagram of a connector of a power battery according to another embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a connector of a power battery according to another embodiment of the present invention.

Reference signs:

Connector 100; power battery pack 200; power battery module 201;

The first fixed piece 10; the first connecting hole 11; the groove 12;

The second fixing piece 20; the second connecting hole 21;

The first intermediate sheet 30; the second intermediate sheet 40; the third intermediate sheet 60; the fourth intermediate sheet 70;

The first bend 51 ; the second bend 52 ; the third bend 53 ; the fourth bend 54 .

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

The following first describes the connector 100 of the power battery according to the embodiment of the present invention.

As shown in FIGS. 1 to 3 , the connector 100 according to the embodiment of the present invention includes a plurality of connecting pieces connected in turn to form a three-dimensional structure, each connecting piece defines a respective main plane, and the connecting piece includes a first A fixed piece 10, n intermediate pieces and a second fixed piece 20, the first fixed piece 10 is used to connect with the first power battery, the second fixed piece 20 is used to be connected with the second power battery, n is greater than or equal to 2 positive integer.

Wherein, the first intermediate sheet 30 of the n intermediate sheets is connected to the first fixed sheet 10 and the main plane of the first intermediate sheet 10 is coplanar with the main plane of the first fixed sheet 10, the nth of the n intermediate sheets The middle piece is connected with the second fixing piece 20, and the n middle pieces are connected successively by bending.

The main plane of the first fixed sheet 10 and the main plane of the first intermediate sheet 30 all intersect with the main planes of the nth intermediate sheet to the second intermediate sheet 40, and the nth intermediate sheet to the second intermediate sheet 40 The main planes of adjacent intermediate sheets intersect each other and the intersection lines are parallel to each other, the intersection line of the second fixed sheet 20 and the nth intermediate sheet and the main plane of the adjacent intermediate sheet in the nth intermediate sheet to the second intermediate sheet 40 lines of intersection are parallel.

In other words, the connector 100 according to the embodiment of the present application is composed of a plurality of connecting pieces, each of which defines a plane. piece 20, the first fixing piece 10 and the second fixing piece 20 are respectively used to connect with the first power battery and the second power battery, and the number of middle pieces can be 2, 3, 4, 5, 6, etc. greater than or equal to 2 positive integer of .

Among the n intermediate sheets, the intermediate sheet connected to the first fixed sheet 10 is the first intermediate sheet 30, and the intermediate sheet connected to the second fixed sheet 20 is the nth intermediate sheet in the n intermediate sheets, The n intermediate pieces are sequentially connected by bending. The first intermediate sheet 30 and the first fixed sheet 10 are located in the same plane, and the main planes of the remaining n-1 intermediate sheets except the first intermediate sheet 30 in the n intermediate sheets are all aligned with the first intermediate sheet 30 Intersect with the plane where the first fixing piece 10 is located.

Wherein, the principal planes of any two adjacent intermediate sheets in the n-1 intermediate sheets intersect each other, and the intersecting lines of a plurality of intersecting principal planes are parallel to each other, and the principal planes of the second fixing sheet 40 and The main planes of the nth intermediate sheet intersect, and the intersection line and the intersection lines of other adjacent intermediate sheets except the first intermediate sheet 30 are parallel to each other.

It should be noted that in this application, the connector 100 is mainly used to connect two power batteries, and the two power batteries are respectively called the first power battery and the second power battery. Among the multiple connecting pieces of the connector 100, Including the first fixed piece 10 connected with the first power battery and the second fixed piece 20 connected with the second power battery, the first fixed piece 10, the second fixed piece 20 and the n intermediate pieces pass through at least two different directions The bending is connected in sequence, and the first fixing piece 10, the second fixing piece 20 intersect with the middle piece to form a connection structure with buffers in three directions, so that the three directions of the connector 100 are flexible, and the first fixing piece 10 The vibration resistance of the connection between the second fixed piece 20 and the two power batteries is more reliable.

Thus, according to the power battery connector 100 of the embodiment of the present invention, the first fixing piece 10, the second fixing piece 20 and the n intermediate pieces are sequentially connected by bending at least two directions in different directions, and the first fixing piece 10. The second fixed piece 20 intersects with the middle piece to form a connection structure with cushioning in three directions, so that the connector 100 has flexibility in three directions, which greatly improves the reliability of the connector 100 against vibration. The device 100 has a simple structure, takes up little space, is convenient to prepare, and has low cost. It replaces the structure of braided wires and does not need to crimp wires at the connection, thereby reducing contact resistance.

According to an embodiment of the present invention, the main plane of the first fixing piece 10 and the main plane of the first intermediate piece 30 are orthogonal to the main planes of the nth to second middle pieces 40 .

Specifically in this application, as shown in Fig. 1 and Fig. 2, the main planes of the first fixed piece 10 and the first intermediate piece 30 are all formed as planes extending in the vertical direction along the left-right direction, except for the first The main planes of the remaining n-1 intermediate sheets other than the intermediate sheet 30 are all formed as planes extending along the front-to-back direction, and the main planes of the n-1 intermediate sheets can be arranged horizontally or vertically in the front-rear direction. It can be set in the vertical direction, and it can also be set obliquely relative to the horizontal or vertical direction. Lines of intersection of main planes where any two adjacent intermediate sheets of the n-1 intermediate sheets are located extend along the front and back directions respectively.

The main plane of the second fixed piece 20 is also formed as a plane extending in the front-rear direction, the second fixed piece 20 is connected with the nth intermediate piece, and the intersection line between the second fixed piece 20 and the nth middle piece The intersecting lines of adjacent main planes in the other n-1 intermediate sheets except one intermediate sheet 30 are parallel, that is, the intersection line between the second fixing sheet 20 and the n-th intermediate sheet also extends along the front-back direction. Therefore, the connector 100 with this structure has higher stability and better shock resistance.

In some embodiments of the present invention, the bend is arc-shaped. That is to say, in the connector 100 according to the embodiment of the present application, the transitions between the connecting pieces are smooth, so that the cushioning effect of the connector 100 can be further improved, and the reliability of shock resistance can be ensured.

Preferably, according to an embodiment of the present invention, the connector 100 is integrally formed by bending a single metal sheet, that is, a plurality of connecting sheets are integrally formed of a metal sheet. Further, the connector 100 may be a copper sheet or an aluminum sheet, or other metal sheets commonly used in this field.

Therefore, the integrally formed connector 100 not only ensures the stability of the overall structure, but also is more convenient to form, further reducing the manufacturing cost, and the integrally formed structure makes the entire connector 100 have no contact resistance.

In some specific embodiments of the present invention, the intermediate sheet is provided with a groove 12 penetrating along the thickness direction of the intermediate sheet. Preferably, the groove 12 extends to a predetermined length on the first fixing piece 10 and the second fixing piece 20 . Further, there are multiple grooves 12 parallel to each other.

In other words, in the present application, among the plurality of connecting pieces of the connector 100, all connecting pieces except the first fixing piece 10 and the second fixing piece 20 are provided with grooves 12, that is, the intermediate pieces are all provided with grooves 12, Moreover, the grooves 12 on the plurality of connecting pieces communicate with each other. Preferably, the groove 12 also extends to the first fixing piece 10 and the second fixing piece 20, and extends to a predetermined length on the first fixing piece 10 and the second fixing piece 20, and the predetermined length can be reasonably adjusted according to actual needs, For example, it may be 1/10-1/4 of the length of the first fixing piece 10 or the second fixing piece 20 .

There can be one or more grooves 12 on each connecting piece. In a preferred situation, there are multiple grooves 12, and the multiple grooves 12 on each connecting piece are parallel to each other.

Therefore, by providing the connector 100 with the groove 12 extending along the extending direction of each part of the connector 100, the buffering effect of the connector 100 can be further improved, and the shock resistance reliability can be ensured.

In some embodiments of the present invention, the first fixing piece 10 is provided with a first connection hole 11 , and the second fixing piece 20 is provided with a second connection hole 21 . Further, there are two first connecting holes 11 arranged at intervals in the longitudinal direction of the first fixing piece 10 , and there are two second connecting holes 21 arranged at intervals in the longitudinal direction of the second fixing sheet 20 .

Wherein, the first fixing piece 10 can be connected with the first power battery through the first connecting hole 11, the second fixing piece 20 can be connected with the second power battery through the second connecting hole 21, two first connecting holes 11 and two The second connecting holes 21 are respectively spaced apart from each other along the longitudinal direction of the first fixing piece 10 and the second fixing piece 20, that is, the two first connecting holes 11 and the two second connecting holes 21 are respectively arranged at intervals along the left and right directions, the structure The connector 100 is more convenient to connect with the power battery, and has better stability and shock resistance.

According to an embodiment of the present invention, the surface of the connector 100 is provided with a metal plating layer, that is, the surface of each connecting piece is respectively provided with a metal plating layer. Optionally, the metal plating layer is an electroplating layer or an electroless plating layer. Therefore, by providing a metal plating layer on the surface of the connector 100, the oxidation resistance of the connector 100 can be greatly improved, thereby prolonging the service life.

In some specific implementations of the present invention, the plurality of connecting pieces are all rectangular, and preferably, each corner of the connecting pieces is rounded respectively.

Therefore, the rectangular connecting piece has relatively high structural stability and higher shock resistance, and each corner of the connecting piece is rounded, that is, each corner of the outer contour of the connector 100 is formed into a rounded structure, which can Avoid the edges and corners of the connection and the edges and corners of the outside structure from causing damage to assemblers and batteries.

A power battery connector 100 according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 , in some specific embodiments of the present invention, there are two middle pieces and include a first middle piece 30 and a second middle piece 40 , and there are two bends and include a first bend 51 and a second middle piece 40 . The second bend 52, the first fixed piece 10 is connected with the right side of the first middle piece 30, the left side of the first middle piece 30 is connected with the front edge of the second middle piece 40 by the first bend 51, the second The upper side of the middle piece 40 is connected with the left side of the second fixing piece 20 through the second bending.

In other words, as shown in Fig. 1, in the present application, the number n of the intermediate sheets is 2, and includes the first intermediate sheet 30 and the second intermediate sheet 40, wherein the second fixed sheet 20 is horizontally along the left and right sides. direction, the second intermediate piece 40 extends in the vertical direction along the front-to-back direction, and the upper edge of the second intermediate piece 40 is connected to the left edge of the second fixing piece 20, that is, the second fixing piece 20 extends from the second middle Sheet 40 extends to the right. The first middle piece 30 extends along the left-right direction in the vertical direction, and the left edge of the first middle piece 30 is connected with the front edge of the second middle piece 40, and the first fixed piece 10 is the same as the first middle piece 30 Extending along the left-right direction in the vertical direction and coplanar with the first middle piece 30, the left edge of the first fixing piece 10 is connected with the right edge of the first middle piece 30, that is, the first fixing piece 10 starts from the first middle piece 30. The right edge of the middle sheet 30 extends rightward.

As shown in FIG. 2 , in other specific embodiments of the present invention, there are two middle pieces and include a first middle piece 30 and a second middle piece 40 , and there are two bends and include a first bend 51 With the second bend 52, the first fixed piece 10 is connected to the right side of the first middle piece 30, and the left side of the first middle piece 30 is connected to the front edge of the second middle piece 40 through the first bend 51, and the second The upper edge of the first middle piece 40 is connected with the right side of the second fixed piece 20 through the second bend 52 .

In other words, as shown in Fig. 2, in the present application, the number n of the intermediate sheets is 2, and includes the first intermediate sheet 30 and the second intermediate sheet 40, wherein the second fixed sheet 20 is horizontally along the left and right sides. direction, the second intermediate piece 40 extends in the vertical direction along the front-to-back direction, and the upper edge of the second intermediate piece 40 is connected to the right edge of the second fixing piece 20, that is, the second fixing piece 20 extends from the second middle Sheet 30 extends to the left. The first middle piece 30 extends along the left-right direction in the vertical direction, and the left edge of the first middle piece 30 is connected with the front edge of the second middle piece 40, and the first fixed piece 10 is the same as the first middle piece 30 Extending along the left-right direction in the vertical direction and being coplanar with the first middle piece 30, the left edge of the first fixing piece 10 is connected with the right edge of the first middle piece 30, that is, the first fixing piece 20 starts from the first middle piece 30. The right edge of the middle sheet 30 extends rightward.

As shown in Figure 4, in other specific embodiments of the present invention, there are four intermediate sheets and include a first intermediate sheet 30, a second intermediate sheet 40, a third intermediate sheet 60 and a fourth intermediate sheet 70, the number of bends is four and includes the first bend 51, the second bend 52, the third bend 53 and the fourth bend 54, the first fixed piece 10 is connected to the right side of the first middle piece 30, the second The left side of an intermediate sheet 30 is connected to the front edge of the second intermediate sheet 40 by the first bend 51, and the upper edge of the second intermediate sheet 40 is connected to the right side of the third intermediate sheet 60 by the second bend 52. The left sides of the three middle pieces 60 are connected to the bottom of the fourth middle piece 70 through the third bend 53 , and the upper side of the fourth middle piece 70 is connected to the right side of the second fixing piece 20 through the fourth bend 54 .

In other words, as shown in FIG. 4, in the present application, the number n of the intermediate sheets is 4, and includes the first intermediate sheet 30, the second intermediate sheet 40, the third intermediate sheet 60 and the fourth intermediate sheet. sheet 70, wherein the second fixed sheet 20 extends horizontally along the left-right direction, the second intermediate sheet 40 and the fourth intermediate sheet 70 extend vertically along the front-to-back direction, and the upper edge of the fourth intermediate sheet 70 It is connected to the right edge of the second fixing piece 20 , that is, the second fixing piece 20 extends leftward from the fourth middle piece 30 .

The third middle piece 60 extends horizontally along the left-right direction, the left edge of the third middle piece 60 is connected with the lower edge of the fourth middle piece 70, and the upper edge of the second middle piece 40 is connected with the third middle piece. The right edges of sheet 60 are contiguous. The first middle piece 30 extends along the left-right direction in the vertical direction, and the left edge of the first middle piece 30 is connected with the front edge of the second middle piece 40, and the first fixed piece 10 is the same as the first middle piece 30 Extending along the left-right direction in the vertical direction and being coplanar with the first middle piece 30, the left edge of the first fixing piece 10 is connected with the right edge of the first middle piece 30, that is, the first fixing piece 20 starts from the first middle piece 30. The right edge of the middle sheet 30 extends rightward.

The power battery module according to the embodiment of the present invention includes a plurality of power batteries, and adjacent power batteries are connected through the connector 100 of the power battery described in the above embodiment. Two adjacent power batteries can be arranged vertically or horizontally, and the connectors 100 in the above-mentioned different embodiments can be used for connection in different arrangements.

The power battery pack 200 according to the embodiment of the present invention includes a plurality of power battery modules 201, and the adjacent power battery modules 201 are connected through the power battery connector 100 described in the above embodiment (as shown in FIG. 3 ). . Two adjacent power battery modules 201 can be arranged vertically or horizontally, and the connectors 100 in the above-mentioned different embodiments can be used for connection in different arrangements.

Since the connector according to the above-mentioned embodiments of the present application has the above-mentioned technical effects, the power battery module and the power battery pack according to the embodiments of the present application also have corresponding technical effects, namely, simple structure, convenient assembly, and high shock resistance.

The electric vehicle according to the embodiment of the present application includes the power battery pack according to the above-mentioned embodiment. Since the connector according to the above-mentioned embodiment of the present application has the above-mentioned technical effect, the electric vehicle according to the embodiment of the present application also has the corresponding technical effect. That is, the structure is simple, the assembly is convenient, and the seismic performance is high.

Other configurations and operations of the electric vehicle according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation indicated by rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc. The positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "below" and "under" the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is less horizontal than the second feature.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limitations to the present invention. Variations, modifications, substitutions, and modifications to the above-described embodiments are possible within the scope of the present invention.

Claims (19)

1. A connector for a power battery, characterized in that it comprises: a plurality of connecting pieces, the connecting pieces are sequentially connected to form a three-dimensional structure, each connecting piece defines a respective main plane, and the connecting pieces include The first fixed piece, n intermediate pieces and the second fixed piece, the first fixed piece is used to connect with the first power battery, the second fixed piece is used to be connected with the second power battery, n is a positive value greater than or equal to 2 integer; The first intermediate sheet of the n intermediate sheets is connected to the first fixed sheet and the main plane of the first intermediate sheet is coplanar with the main plane of the first fixed sheet, and the n intermediate sheets The nth middle piece of the second fixed piece is connected to each other, and the n middle pieces are sequentially connected by bending; The main plane of the first fixed piece and the main plane of the first intermediate piece intersect the main planes of the nth middle piece to the second middle piece, and the nth middle piece to the second middle piece The main planes of adjacent intermediate sheets in the two intermediate sheets intersect with each other and the intersection lines are parallel to each other, and the intersection line between the second fixed sheet and the n-th intermediate sheet is the same as that between the n-th intermediate sheet and the second intermediate sheet. The intersecting lines of the main planes of adjacent intermediate sheets are parallel. 2. The power battery connector according to claim 1, characterized in that, the main plane of the first fixing piece and the main plane of the first intermediate piece are the same as the The principal planes of the intermediate slices are orthogonal. 3. The power battery connector according to claim 1 or 2, wherein the bending is arc-shaped. 4. The power battery connector according to claim 3, wherein the connector is integrally formed by bending a single metal sheet. 5 . The power battery connector according to claim 3 , wherein the intermediate sheet is provided with a groove penetrating along the thickness direction of the intermediate sheet. 6 . 6 . The power battery connector according to claim 5 , wherein the groove extends to the first fixing piece and the second fixing piece for a predetermined length. 7. The power battery connector according to claim 5, wherein there are multiple grooves parallel to each other. 8. The power battery connector according to claim 1, wherein a first connection hole is formed on the first fixing piece, and a second connection hole is formed on the second fixing piece. 9. The power battery connector according to claim 8, characterized in that there are two first connecting holes arranged at intervals in the longitudinal direction of the first fixing piece, and the second connecting holes are Two of them are spaced apart from each other in the longitudinal direction of the second fixing piece. 10. The power battery connector according to claim 1, wherein the connecting piece is a copper piece or an aluminum piece. 11. The power battery connector according to claim 1, wherein the surface of the connecting piece is provided with a metal plating layer. 12. The power battery connector according to claim 11, wherein the metal plating layer is an electroplating layer or an electroless plating layer. 13. The power battery connector according to claim 1, wherein the connecting pieces are all rectangular. 14. The power battery connector according to claim 13, wherein each corner of the connecting piece is rounded respectively. 15. The power battery connector according to claim 1, wherein there are two intermediate pieces and include a first intermediate piece and a second intermediate piece, and there are two bends and include a second intermediate piece One bend and second bend, the first fixed piece is connected to the right side of the first middle piece, the left side of the first middle piece is connected to the second middle piece through the first bend The front edges are connected, and the upper edge of the second middle piece is connected with the left side of the second fixing piece through the second bending. 16. The power battery connector according to claim 1, wherein there are two intermediate pieces and include a first intermediate piece and a second intermediate piece, and there are two bends and include a second intermediate piece One bend and second bend, the first fixed piece is connected to the right side of the first middle piece, the left side of the first middle piece is connected to the second middle piece through the first bend The front edges are connected, and the upper edge of the second middle piece is connected with the right side of the second fixing piece through the second bending. 17. A power battery module, characterized in that it comprises a plurality of power batteries, and the adjacent power batteries are connected through the connector of any one of claims 1-16. 18. A power battery pack, characterized in that it comprises a plurality of power battery modules, and the adjacent power battery modules are connected through the power battery connector according to any one of claims 1-16. 19. An automobile, comprising the power battery pack according to claim 18.