CN115064828A

CN115064828A - Electricity core connecting piece and battery module

Info

Publication number: CN115064828A
Application number: CN202210586148.2A
Authority: CN
Inventors: 陈剑伟; 李水源; 李明会; 薛彤
Original assignee: Farasis Energy Ganzhou Co Ltd; Farasis Energy Zhenjiang Co Ltd
Current assignee: Farasis Energy Ganzhou Co Ltd; Farasis Energy Zhenjiang Co Ltd
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2022-09-16
Anticipated expiration: 2042-05-27
Also published as: CN115064828B

Abstract

The utility model provides a cell connecting piece and a battery module, belonging to the technical field of batteries, wherein the cell connecting piece comprises a first connecting part, a second connecting part and a bridge part connected between the first connecting part and the second connecting part; the battery cell connecting piece comprises a plurality of sub-connecting pieces which are connected in sequence; each sub-connecting piece comprises a first sub-connecting part, a second sub-connecting part and a sub-bridging part connected between the first sub-connecting part and the second sub-connecting part; the first sub-connecting parts of the sub-connecting pieces are sequentially connected to form a first connecting part; the second sub-connecting parts of the sub-connecting pieces are sequentially connected to form a second connecting part; the sub-bridging parts of the sub-connecting pieces are sequentially connected to form a bridging part. According to the embodiment of the disclosure, the flow area is increased while the normal work of the battery system is ensured, and the mechanical connection facilitates the management and maintenance of battery modularization, so that the production process is simpler and more convenient, and the industrialization efficiency is improved.

Description

Electricity core connecting piece and battery module

Technical Field

The utility model belongs to the technical field of the battery, concretely relates to electricity core connecting piece and battery module.

Background

With the rapid development of new energy industry, people have higher and higher requirements on battery systems. It is desirable to perform timely maintenance of a portion of a battery module where a problem occurs, while making high energy density and high safety requirements for the battery. The battery module is passed through the series connection by a plurality of electric cores or parallelly connected constitution, realizes the series-parallel connection through electric core connecting piece between the electric core, and present electric core connecting piece is mostly simple sheetmetal, through the sheetmetal welding between two electric core utmost point posts. However, the mode of utilizing the sheetmetal welded connection two electric cores is not firm, causes the phenomenon of desoldering easily, and its cost of maintenance is higher, in addition, probably causes the harm to other electric cores in the maintenance process, can't carry out the maintenance of single electric core even, can only replace whole battery module, has improved electric core material cost.

Disclosure of Invention

The present invention is directed to at least one of the technical problems of the prior art, and provides a cell connecting member and a battery module.

In a first aspect, an embodiment of the present disclosure provides a cell connecting member, which includes a first connecting portion, a second connecting portion, and a bridging portion connected between the first connecting portion and the second connecting portion;

the battery cell connecting piece comprises a plurality of sub-connecting pieces which are connected in sequence; any sub-connecting piece comprises a first sub-connecting part, a second sub-connecting part and a sub-bridging part connected between the first sub-connecting part and the second sub-connecting part; wherein, the first and the second end of the pipe are connected with each other,

the first sub-connecting parts of the sub-connecting pieces are sequentially connected to form the first connecting part; the second sub-connecting parts of the sub-connecting pieces are sequentially connected to form the second connecting part; the sub bridging parts of the sub connecting pieces are sequentially connected to form the bridging parts.

In some examples, the plurality of sub-connectors are arranged in a stack; wherein the content of the first and second substances,

the first sub-connecting parts of the sub-connecting pieces are sequentially stacked to form the first connecting part; the second sub-connecting parts of the sub-connecting pieces are sequentially stacked to form the second connecting part; the sub-bridging portions of the sub-connectors are sequentially stacked to form the bridging portion.

In some examples, each of the sub-connectors is connected as a unitary structure.

In some examples, the first sub-connection portion, the second sub-connection portion, and the sub-bridge portion are an integrally molded structure.

In some examples, the first sub-connection portion and the second sub-connection portion are each circular arcs or elliptical arcs in shape.

In a second aspect, an embodiment of the present disclosure further provides a battery module, which includes the above battery cell connector.

In some examples, the battery further comprises a plurality of battery cells, and the first connection portion and the second connection portion of the battery cell connection member are in interference fit with two battery cell poles respectively.

In some examples, the cell post has a connection hole, and the battery module further includes a first fixing member that is insertable into the connection hole of the cell post, so that the first connection portion and the second connection portion are in interference fit with the corresponding cell post.

In some examples, the first fixing member includes an expansion coil and an expansion screw fitted to the expansion coil.

In some examples, the device further comprises a bottom plate and a side plate which is connected with the bottom plate and is arranged oppositely; a first fixing groove and a second fixing groove are formed in the side plate; the first fixing groove is matched with the first connecting part and used for fixing the first connecting part; the second fixing groove is matched with the second connecting part and used for fixing the second connecting part.

In some examples, a limiting step is arranged in each of the first fixing groove and the second fixing groove and used for limiting the position of the first fixing piece.

In some examples, an end plate and a pressure plate are also included; the end plate is connected with the first end of the side plate and the bottom plate; the pressing plate is opposite to the end plate and is detachably connected with the side plate.

Drawings

Fig. 1 is a schematic diagram of a cell connector provided in an embodiment of the present disclosure;

fig. 2a is a front view of a cell connector provided in an embodiment of the present disclosure;

FIG. 2b is a cross-sectional view taken along A-A' of FIG. 2 a;

FIG. 2c is a partial view of section I of FIG. 2 b;

FIG. 2d is a schematic view of a sub-connector provided in an embodiment of the present disclosure;

fig. 3a is a schematic diagram of a battery cell provided in an embodiment of the present disclosure;

fig. 3b is a schematic diagram of a cell post provided in the embodiment of the present disclosure;

fig. 4 is a top view of a cell post provided in an embodiment of the present disclosure;

FIG. 5a is a schematic view of an expansion coil provided in accordance with an embodiment of the present disclosure;

FIG. 5b is a top view of an expansion coil provided by embodiments of the present disclosure;

FIG. 6a is a schematic view of an expansion screw provided in an embodiment of the present disclosure;

FIG. 6b is a partial view of section II of FIG. 6 a;

FIG. 7 is a schematic diagram of electrical connection details provided by an embodiment of the present disclosure;

fig. 8a is a schematic side plate provided in an embodiment of the present disclosure;

FIG. 8b is a partial view of section III of FIG. 8 a;

FIG. 8c is a partial view of section IV of FIG. 8 a;

fig. 9a is a schematic diagram illustrating a cell connector installation provided in an embodiment of the present disclosure;

FIG. 9b is a partial view of section V of FIG. 9 a;

fig. 10a is a schematic view illustrating the installation of a battery module according to an embodiment of the present disclosure;

FIG. 10b is a fragmentary view of section VI of FIG. 10 a;

fig. 11 is a schematic diagram of a cell post provided in the embodiment of the present disclosure.

Wherein the reference numerals are: an electric core 100; a cell post 101; a current post slot 102; a cell connector 200; an expansion coil 300; an expansion screw 400; a side plate 500; a limiting step 501; an electric connector fixing groove 502; an end plate bottom plate integral piece 600; the pressure plate 700.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

The battery module generally comprises a battery cell connecting piece and a plurality of battery cells arranged in the battery module; each cell includes a core stack, a cell post (positive cell post/negative cell post). Wherein, a plurality of electric cores in the battery module can be connected in series, also can be connected in parallel. For convenience of description and understanding, the battery module is described by taking the example that the battery module comprises N battery cells, wherein N is more than or equal to 2. The 1 st electric core-the Nth electric core in the N electric cores are sequentially arranged along a first direction, and the N electric cores are connected in series through electric core connecting pieces. Specifically, the negative cell pole of the ith cell is electrically connected with the positive cell pole of the (i + 1) th cell through a cell connecting piece, wherein i is not more than N-1.

The inventor finds that the electrical connection between the cell pole and the cell connecting piece is generally realized by welding. And so, if after certain electric core in the battery module goes wrong, then need handle with electric core utmost point post and the electric core connecting piece of welding together with it, cost of maintenance is high, causes the damage to other electric cores easily in the processing procedure moreover, can't carry out single electric core maintenance even, can only replace whole electric core group. Such a maintenance method is time and labor consuming and also increases the cost of the material.

In view of this, in the embodiments of the present disclosure, a cell connecting member and a battery module including the cell connecting member are provided.

In a first aspect, fig. 1 is a schematic diagram of a cell connector provided in an embodiment of the present disclosure; fig. 2a is a front view of a cell connector provided in an embodiment of the present disclosure; FIG. 2b is a cross-sectional view taken along A-A' of FIG. 2 a; FIG. 2c is a partial view of section I of FIG. 2 b; fig. 2d is a schematic diagram of a sub-connection unit provided in an embodiment of the disclosure, and as shown in fig. 1, fig. 2a, fig. 2b, fig. 2c, and fig. 2d, the cell connection unit 200 includes a first connection portion 21, a second connection portion 22, and a bridge portion 23 connected between the first connection portion 21 and the second connection portion 22. The first connecting portion 21 and the second connecting portion 22 are respectively fixed to and electrically connected to the two cell poles 101, so as to electrically connect the two cell poles 101.

In the embodiment of the present disclosure, the cell connector 200 includes sub-connectors 201 connected in sequence; any sub-connection 201 includes a first sub-connection portion 211, a second sub-connection portion 221, and a sub-bridge portion 231 connected between the first sub-connection portion 211 and the second sub-connection portion 221; wherein, the first sub-connecting parts 211 of each sub-connecting part 201 are connected in sequence to form a first connecting part 21; the second sub-connection parts 221 of the sub-connection members 201 are connected in sequence to form a second connection part 22; the bridge portions 23 are formed by sequentially connecting the sub-bridge portions 231 of the respective sub-connections 201, and in this way, a plurality of sequentially connected sub-connection portions 201 are formed to form the cell connection member 200.

It should be noted that the number of the sub-connection members 201 in the cell connection member 200 according to the embodiment of the present disclosure may be correspondingly increased according to the flow area. In addition, the shapes of the first sub-connection portion 211 and the second sub-connection portion 221 in the sub-connection member 201 are adapted to the shape of the cell pole 101, for example: when the shape of the cell pole 101 is a cylinder, the shapes of the first and second

sub-connection portions

211 and 221 are arcs.

In some examples, the plurality of sub-connectors 201 of the cell connector 200 are sequentially stacked, so that the plurality of sub-connectors 201 are connected. Wherein the first sub-connection portions 211 of the sub-connection members 201 are sequentially stacked to form a first connection portion 21; the second sub-connection parts 221 of the sub-connection members 201 are sequentially stacked to form the second connection part 22; the sub-bridge portions 231 of the respective sub-connections 201 are stacked in sequence to form the bridge portion 23, and in this way, a plurality of stacked sub-connection portions 201 are formed to form the cell connection member 200.

It should be noted that the cell connector 200 of the embodiment of the present disclosure may not be formed by sequentially stacking a plurality of sub-connectors 201, that is, the forming manner of the cell connector 200 is not limited in the embodiment of the present disclosure; similarly, the first sub-connection portions 211 of the sub-connection members 201 may not be stacked in sequence to form the first connection portion 21; the second sub-connection portions 221 of the sub-connection members 201 may not be stacked in sequence to form the second connection portion 22; the sub-bridge portions 231 of the respective sub-connectors 201 may not be stacked in sequence to form the bridge portion 23. For convenience, the following description of the embodiments of the present disclosure is provided in the form of a stack.

In some examples, the sub-connectors 201 of the cell connectors 200 are connected as a single structure, and a groove is formed between the adjacent sub-connectors 201. The structure is similar to a staple structure, and the cell connecting piece 200 can be formed by stamping. The cell connecting piece 200 formed in this way can ensure good electrical connection between the sub-connecting pieces 201. It should be understood that the formation of the cell connector 200 is not limited to the stamping, and any method may be used as long as the cell connector 200 electrically connected by the plurality of sub-connectors 201 can be formed.

In some examples, the first sub-connection portion 211, the second sub-connection portion 221, and the sub-bridge portion 231 are an integrally molded structure. The manufacturing process of the battery cell connecting piece 200 formed in the way is simple, and the manufacturing cost is reduced.

In some examples, the first sub-connection portion 211 and the second sub-connection portion 221 are each shaped as a circular arc or an elliptical arc. As shown in fig. 1, 2a, 2b, 2c, and 2d, the first sub-connection portion 211 and the second sub-connection portion 221 are both circular arc-shaped. When electric core connecting piece 200 is connected with electric core utmost point post 101 electricity, guaranteed the minimum line area of contact of electric core connecting piece 200 with electric core utmost point post 101, follow-up in-process that compresses tightly, effort each other forms micro-deformation, has increased and has flowed area of contact, does benefit to the battery and realizes filling soon.

It should be noted that the shapes of the first sub-connection portion 211 and the second sub-connection portion 221 in the embodiment of the present disclosure depend on the shape of the cell post 101 to be connected thereto. For example: when the shape of the cell pole 101 is cylindrical, the first sub-connection portion 211 and the second sub-connection portion 221 are both arc-shaped; when the shape of the cell pole 101 is a trapezoid, the second sub-connection portion 211 and the second sub-connection portion 221 are both trapezoidal.

In some examples, the material of each sub-connector 201 is a bendable flexible material, such as: the material of the sub-connection member 201 may be a metal material such as copper, aluminum, etc., and of course, the sub-connection member 201 may also be an alloy material, etc., which are not listed here. The reason why the material of the sub-connection member 201 is made of a bendable flexible material is that when the first connection portion 21 and the second connection portion 22 are respectively fixed to the cell post 101, the cell post 101 and the connection portions can be in contact under the action of external force, so that tight attachment and even micro deformation can be realized, and the overcurrent requirement can be met; and at the same time, the cell connector 200 is conveniently inserted into the cell connector fixing groove 502 for fixing.

In a second aspect, an embodiment of the present disclosure further provides a battery module, which includes any one of the cell connectors 200 in the foregoing embodiments and a plurality of cells 100; each battery cell 100 has a battery cell terminal 101, and one battery cell connecting member 200 is electrically connected to the battery cell terminals 101 of two adjacent battery cells 100, so as to implement series connection or parallel connection between the battery cells 100.

For the purpose of clarifying the structure of the battery module in the embodiment of the present disclosure, the battery cells 100 in the battery module are connected in series through the cell connectors 200 as an example. Fig. 10a is a schematic view illustrating the installation of a battery module according to an embodiment of the present disclosure; FIG. 10b is a partial view of part VI of FIG. 10a, and as shown in FIGS. 10a and 10b, the battery module includes N battery cells 100, where N ≧ 2. The first battery cell 100 to the nth battery cell 100 are arranged side by side along a first direction, a positive electrode cell post 101 of the first battery cell 100 is connected with the first conductive structure, and a negative electrode cell post 101 of the nth battery cell 100 is connected with the second conductive structure; the first connection portion 21 of one cell connection member 200 is electrically connected to the negative cell post 101 of the i-th cell 100, and the second connection portion 22 is electrically connected to the positive cell post 101 of the i + 1-th cell 100, so as to form a series circuit between the cells 100. Wherein i is 1 to N-1, and i is a positive integer.

It is understood that the negative cell post 101 of the first battery cell 100 is connected to the first conductive structure, the positive cell post 101 of the nth battery cell 100 is connected to the second conductive structure, and the first conductive structure and the second conductive structure may be the same as the first connection portion 21/the second connection portion 22.

In some examples, the battery module according to the embodiment of the present disclosure includes not only the battery cell 100 and the battery cell connector 200 described above, but also a bottom plate and two side plates 500 that are disposed opposite to each other and connected to the bottom plate. Wherein, be provided with the fixed slot on curb plate 500, electric core connecting piece 200 can be installed in the fixed slot of curb plate 500 in the battery module in advance, and after electric core 100 inserted in the accommodation space of battery module, electric core utmost point post 101 was connected with electric core connecting piece 200 electricity to realize the polyphone between electric core 100 or parallelly connected. When the battery module that this disclosed embodiment provided goes wrong, can directly take out electric core 100 in the accommodation space of battery module and maintain or change, compare the electric connection mode of sheetmetal welding between two electric core utmost point posts 101, the battery module greatly reduced that this disclosed embodiment provided maintains efficiency and practiced thrift the cost. It should be noted that, since the side plate 500 is usually made of a conductive material, the short circuit phenomenon of the cell connecting member 200 is easily caused, and therefore, an insulating layer is disposed in the fixing groove of the side plate 500, so that the cell connecting member 200 installed in the fixing groove of the side plate 500 is insulated from the side plate 500, and it is ensured that the short circuit phenomenon does not occur in each cell connecting member 200.

Specifically, the side plate 500 is provided with a first fixing groove and a second fixing groove; the first fixing groove is matched with the first connecting part 21 and used for fixing the first connecting part 21; the second fixing groove is fitted with the second connection part 22 to fix the second connection part 22. Fig. 8a is a schematic side plate provided in an embodiment of the present disclosure; FIG. 8b is a partial view of section III of FIG. 8 a; fig. 8c is a partial view of the portion iv in fig. 8a, and as shown in fig. 8a, 8b, and 8c, the first fixing groove and the second fixing groove form a cell connector fixing groove 502 and are disposed on the side plate 500. Fig. 9a is a schematic diagram of a cell connector installation provided in an embodiment of the present disclosure; fig. 9b is a partial view of the v portion in fig. 9a, and as shown in fig. 9a and 9b, the cell connector 200 is fixed on the side plate 500 through a cell connector fixing groove 502 formed by a first fixing groove and a second fixing groove.

In some examples, a position limiting step 501 is disposed in each of the first fixing groove and the second fixing groove to limit the position of the first fixing member. As shown in fig. 8a, 8b, and 8c, a limiting step 501 is disposed in the cell connector fixing groove 502 to limit the position of the first fixing member.

In some examples, the battery module further includes end plates and a pressing plate 700; the end plate is connected with the first end of the side plate 500 and the bottom plate; the pressing plate 700 is disposed opposite to the end plate, detachably connected to the side plate 500, and may be used to fix the battery cell 100. Fig. 10a is a schematic view illustrating the installation of a battery module according to an embodiment of the present disclosure; fig. 10b is a partial view of the vi part in fig. 10a, and as shown in fig. 10a and 10b, the battery module includes at least two battery cells 100, an end plate, a bottom plate, a side plate 500, a pressure plate 700, an expansion coil 300, and an expansion screw 400. For the sake of illustration, the end plate and bottom plate integrated member 600 is used to refer to the end plate and the bottom plate. The cell connecting piece 200 is pre-installed and fixed in the cell connecting piece fixing groove 502 of the side plate 500; the side plates 500, the end plates and the bottom plate are pre-installed to form a mouth-shaped space shell; the battery cells 100 are sequentially inserted into the inlet-type space casing; the pressing plate 700 is pushed towards the end plate to tightly press the large surface of the battery cell 100; sequentially inserting the expansion solenoid 300 into the cell post groove 102, wherein the expansion solenoid 300 is limited by a limiting step 501 in the side plate 500 and fixed in the cell post groove 102; the expansion screws 400 are inserted in sequence to expand the expansion screw 300, so that the cell poles 101 are extruded outwards to be in contact with the cell connecting piece 200, and finally an electric connection path is formed. The pushing manner of the pressing plate 700 toward the end plate is not limited, as long as the large surface of the battery cell 100 can be pressed.

It should be noted that, in the embodiment of the present disclosure, the side plate 500 is made of a material having a strength capable of resisting an expansion force generated after the cell connector 200 is pressed by deformation generated when the expansion screw 400 is inserted into the cell post 101.

In some examples, the first and

second connection portions

21 and 22 of the cell connector 200 are interference-fitted with the two cell poles 101, respectively. In the manner of interference fit, the cell post 101 and the cell connector 200 may be in surface contact, so as to form a current path.

It should be noted that, although the connection between the cell post 101 and the first connection portion 21/the second connection portion 22 is realized by interference fit, in this connection manner, an interaction force is generated between the cell post 101 and the first connection portion 21/the second connection portion 22, and also mutual extrusion occurs between the two, so that a minimum line contact area between the cell connection member 200 and the cell post 101 is ensured, and in a subsequent compression process, the interaction force forms a micro deformation, so that an overcurrent contact area is increased, and a battery is facilitated to realize quick charging.

Fig. 7 is a schematic diagram illustrating electrical connection details provided by an embodiment of the present disclosure, and as shown in fig. 7, the electrical connection process includes three steps, where a first step is to contact but not electrically connect the battery cell 101 with the battery cell connector 200, a second step is to sequentially insert the expansion screw 300 into the battery cell post slot 102, and a third step is to sequentially insert the expansion screw 400 into the expansion screw 300, so that the expansion screw 300 is forced to expand, and the battery cell post 101 is pressed outward to contact with the battery cell connector 200, thereby finally forming an electrical connection path. Before the expansion screw 400 is inserted, the cell post 101 is not in contact with the cell connector 200; after the expansion screw 400 is inserted, the cell post 101 is forced to deform outward and contact the cell connector 200 to form a passage.

In some examples, the cell post 101 has a connection hole, and the connection hole may be an open loop or a closed loop, preferably an open loop; the battery module further comprises a first fixing piece, and the interference fit between the battery cell pole 101 and the battery cell connecting piece 200 can be realized through the first fixing piece. Specifically, the first fixing member may be inserted into the open-loop connection hole of the cell pole 101, so that the first connection portion 21 and the second connection portion 22 are in interference fit with the corresponding cell pole 101 of the battery cell 100. In the interference fit manner, the cell post 101 and the cell connector 200 are in contact with each other to form a current path. Fig. 3a is a schematic diagram of a cell provided in an embodiment of the present disclosure; fig. 3b is a schematic diagram of a cell post provided in the embodiment of the present disclosure; fig. 4 is a top view of a battery cell post provided in the embodiment of the present disclosure, as shown in fig. 3a, fig. 3b, and fig. 4, the battery cell post 101 is disposed on a battery cell 100, and has an open-loop connection hole, an opening of the open-loop connection hole of the battery cell post 101 deviates from the battery cell 100, and a first fixing member can be inserted into the open-loop connection hole of the battery cell post 101, so that the first connection portion 21 and the second connection portion 22 are in interference fit with the corresponding battery cell post 101. The open-loop structure can take place small deformation when interference fit, easily realizes the face contact of electric core utmost point post 101 and electric core connecting piece 200, and through interference fit's mode, electric core utmost point post 101 and the contact of electric core connecting piece 200 form the electric current route.

It should be noted that, in the embodiment of the present disclosure, specific forms, structures, and compositions of the first fixing element are not limited, as long as the first fixing element can be inserted into the open-loop connection hole of the cell post 101, so that the first connection portion 21 and the second connection portion 22 can be in interference fit with the corresponding cell post 101 of the cell 100, and the cell post 101 and the cell connection element 200 are in contact with each other to form a current path in the interference fit manner.

In some examples, the first fixture includes an expansion coil 300 and an expansion screw 400 fitted to the expansion coil 300. FIG. 5a is a schematic view of an expansion coil provided in accordance with an embodiment of the present disclosure; fig. 5b is a top view of an expansion coil provided in accordance with an embodiment of the present disclosure, and as shown in fig. 5a and 5b, the expansion coil 300 is a hollow cylinder. FIG. 6a is a schematic view of an expansion screw provided in accordance with an embodiment of the present disclosure; fig. 6b is a partial view of a portion ii of fig. 6a, and as shown in fig. 6a and 6b, the expansion screw 400 includes a first cylinder and a second cylinder, the first cylinder and the second cylinder are connected, and the second cylinder is threaded on the surface. The expansion screw 400 is inserted into the expansion solenoid 300, so that the expansion solenoid 300 expands, and the battery cell pole 101 is forced to deform outwardly and contacts with the battery cell connector 200 to form a current path. In one example, the expansion coil 300 may use a side wall opening type, for example, the opening penetrates through the side wall along the axial direction of the expansion coil 300, and the expansion coil 300 of this type facilitates the expansion of the expansion coil 300 outwards when the expansion screw 400 is inserted into the expansion coil 300, so that the cell connector 200 clasps the cell pole 101.

In some examples, the opening of the open-loop connection hole of the cell pole 101 faces the battery cell 100 or faces away from the battery cell 100. Fig. 11 is a schematic diagram of a cell post provided in the embodiment of the present disclosure. As shown in fig. 4 and 11, the opening of the open-loop connection hole of the cell post 101 in fig. 4 faces away from the battery cell 100, and the opening of the open-loop connection hole of the cell post 101 in fig. 11 faces toward the battery cell 100. The battery cell pole 101 is arranged to be connected to the battery cell connecting member 200, so that the battery cells 100 are connected in series or in parallel, and no matter where the opening of the battery cell pole 101 faces, the battery cell pole 101 can be adapted to the battery cell connecting member 200 and the flow area between the battery cell pole and the battery cell connecting member is ensured.

It should be noted that, in the embodiment of the present disclosure, the connection hole of the cell post 101 may not be an open-loop connection hole, that is, there is no opening, as long as the first fixing element can be inserted into the connection hole of the cell post 101, so that the first connection portion 21 and the second connection portion 22 can be in interference fit with the corresponding cell post 101 of the battery cell 100, and the cell post 101 and the cell connection member 200 are in contact with each other to form a current path in the interference fit manner.

It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and scope of the invention, and such modifications and improvements are also considered to be within the scope of the invention.

Claims

1. A battery cell connecting piece comprises a first connecting part, a second connecting part and a bridging part connected between the first connecting part and the second connecting part; it is characterized in that the preparation method is characterized in that,

the battery cell connecting piece comprises a plurality of sub-connecting pieces which are connected in sequence; any sub-connecting piece comprises a first sub-connecting part, a second sub-connecting part and a sub-bridging part connected between the first sub-connecting part and the second sub-connecting part; wherein the content of the first and second substances,

2. The cell connector of claim 1, wherein a plurality of the sub-connectors are sequentially stacked; wherein, the first and the second end of the pipe are connected with each other,

3. The cell connector of claim 1, wherein the sub-connectors are connected as a unitary structure.

4. The cell connector of claim 1, wherein the first sub-connection portion, the second sub-connection portion, and the sub-bridge portion are integrally formed.

5. The cell connector of claim 1, wherein the first sub-connector portion and the second sub-connector portion are each arc or arc of ellipse in shape.

6. A battery module, characterized by comprising the cell connector of any one of claims 1-5.

7. The battery module of claim 6, further comprising a plurality of cells, wherein the first connection portion and the second connection portion of the cell connection member are in interference fit with two cell poles respectively.

8. The battery module according to claim 7, wherein the cell post has a connection hole, and the battery module further comprises a first fixing member, and the first fixing member is insertable into the connection hole of the cell post, so that the first connection portion and the second connection portion are in interference fit with the corresponding cell post.

9. The battery module according to claim 8, wherein the first fixing member includes an expansion coil and an expansion screw fitted to the expansion coil.

10. The battery module according to claim 7, further comprising a bottom plate, and side plates connected to the bottom plate and disposed opposite to each other; a first fixing groove and a second fixing groove are formed in the side plate; the first fixing groove is matched with the first connecting part and used for fixing the first connecting part; the second fixing groove is matched with the second connecting part and used for fixing the second connecting part.

11. The battery module according to claim 10, wherein a position-limiting step is provided in each of the first fixing groove and the second fixing groove to limit the position of the first fixing member.

12. The battery module according to claim 10, further comprising end plates and a pressure plate; the end plate is connected with the first end of the side plate and the bottom plate; the pressing plate is opposite to the end plate and is detachably connected with the side plate.