CN211828998U

CN211828998U - Bus bar for battery module and battery assembly thereof

Info

Publication number: CN211828998U
Application number: CN202020177789.9U
Authority: CN
Inventors: 陈钢
Original assignee: Zhejiang Qixiang Technology Co Ltd
Current assignee: Zhejiang Qixiang Technology Co Ltd
Priority date: 2020-02-17
Filing date: 2020-02-17
Publication date: 2020-10-30
Anticipated expiration: 2030-02-17

Abstract

The utility model discloses a confluence sheet for a battery module and a battery assembly thereof, wherein the confluence sheet comprises a body which is used for being electrically connected with an electric core and/or the electrode surface of the electric core group; a bus terminal for connection with a circuit board; the bus terminal extends transversely to the circuit board at least partially, and comprises a bending part and a wiring part, wherein the bending part is bent transversely, and the wiring part is used for wiring. The battery module has the advantages that the bending part of the bus terminal which is transversely bent buffers the impact force in the vertical direction, the shock can be absorbed, the leakage of the wiring part of the battery module and the circuit board can be prevented, the size of the circuit board can be reduced, and the cost of the circuit board can be reduced.

Description

Bus bar for battery module and battery assembly thereof

Technical Field

The utility model relates to a battery module technical field especially relates to a piece that converges and battery pack for battery module.

Background

At present, the cylindrical battery has standardized shape, is convenient for standardized mass production and is widely applied, and along with the maturity of the battery production process, the cylindrical battery is widely applied to the fields of electric tools, electric automobiles, energy storage application and the like, and a battery module with higher voltage and larger capacity is required. The conducting strip in the battery module is connected with the circuit board through the power transmission terminal, generally is hard connection, consequently receives vibration influence and fracture easily in the battery module motion process, leads to connecting the interrupt, influences the normal use of battery module.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, one of the purposes of the utility model is to provide a converge piece for battery module, which has good damping effect, can be more firmly and stably connected with a circuit board, and effectively prevents electric leakage.

A second object of the utility model is to provide a battery pack, including electric core or electric core group, still include above-mentioned confluence piece, circuit board shock attenuation effect is better, connects more stably.

The third object of the utility model is to provide a battery pack, including a plurality of batteries, including above-mentioned confluence piece, circuit board shock attenuation effect is better, connects more stably.

The utility model discloses an one of the purpose adopts following technical scheme to realize:

a bus bar for a battery module comprises a body, a plurality of bus bars and a plurality of connecting plates, wherein the body is used for being electrically connected with an electric core and/or an electrode surface of an electric core group;

a bus terminal for connection with a circuit board;

the bus terminal at least partially extends transversely to the circuit board and comprises a transversely bent bending part and a wiring part for wiring.

Preferably, the body is integrally formed with the bus bar terminal.

Preferably, the bending part is made of a deformable material.

The second purpose of the utility model is realized by adopting the following technical scheme:

a battery assembly comprises at least one battery module, wherein the battery module comprises at least two battery cells and/or battery cell groups connected in series or in parallel, an insulation fixing frame and a conducting strip, the insulation fixing frame is used for supporting and fixing the battery cells and separating the battery cells from each other so that the battery cells are not in contact with each other; the battery module is characterized by further comprising at least two bus sheets, wherein the bus sheets are connected with the outer side electrodes of the battery module through the conducting sheets and connected to a circuit board through the bus terminals, and at least part of the bus terminals transversely extend towards the circuit board.

Preferably, the bending part of the bus terminal is disposed outside the insulating fixing frame, and a gap is formed between the bending part and a horizontal plane of the insulating fixing frame.

Preferably, the bus terminal is electrically and mechanically connected to the circuit board at the same time by a connecting member; the bus bar terminal is fixed to the connecting member by a rivet joint.

Preferably, at least two battery modules are included, and the adjacent battery modules are connected in series; the bus bar piece further comprises a second bus bar piece, the second bus bar piece comprises a second bus terminal and a second body, and the second bus terminal is parallel to the second body; the second bus bar pieces are arranged on one side, close to the adjacent battery modules, and are connected in series.

Preferably, the second bus terminals of the adjacent second bus pieces are correspondingly overlapped and connected in series; the bus terminals connected with the two ends of the circuit board and the second bus terminals are arranged in a staggered mode.

Preferably, the bus bar is located between the conducting plate and the insulating fixing frame, the conducting plate is fixedly connected with the insulating fixing frame to position the bus bar, and the conducting plate is attached to the bus bar; and the conductive part on the conductive sheet is used for being electrically connected with the electrode end of the battery.

The third purpose of the utility model is realized by adopting the following technical scheme:

a battery assembly comprises at least one battery module, wherein the battery module comprises a plurality of batteries, an insulating fixing frame and a conducting strip, and the insulating fixing frame is used for fixing the batteries; the printed circuit board further comprises at least two bus sheets, wherein the two bus sheets are respectively connected with two ends of the circuit board, and the bending part is bent and extended towards the direction of the circuit board; the collector plate is arranged on the outer side of the insulating fixing frame and is connected with the conducting plate; the bending part of the bus terminal is arranged outside the insulating fixing frame and a gap is arranged between the bending part of the bus terminal and the insulating fixing frame.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model discloses a function of the terminal that converges of piece lies in drawing out the electric current on conducting strip and the piece that converges to the circuit board, in order to strengthen the shock resistance, the terminal that converges includes the kink of horizontal bending and the wiring portion that is used for the wiring, the kink of terminal horizontal bending that converges can cushion the impact force of vertical direction, plays the shock attenuation effect, prevents the wiring of battery module and circuit board electric leakage; the utility model discloses a kink of the terminal that converges among the battery pack is buckled towards the circuit board direction, makes wiring portion more be close to the circuit board to can reduce the volume of circuit board, reduce circuit board cost.

Drawings

FIG. 1 is a schematic structural diagram of a bus bar of the present embodiment;

FIG. 2 is a schematic view of a portion of the structure of the battery pack of the present embodiment;

fig. 3 is a schematic structural diagram of the battery module of the present embodiment;

fig. 4 is an angular exploded view of the battery module according to the present embodiment;

fig. 5 is an exploded view illustrating the battery module according to the present embodiment;

fig. 6 is an enlarged view of a portion a in fig. 5.

In the figure: 1. an insulating fixing frame; 11. a first fixing frame; 111. positioning the insert block; 112. an extension block; 12. A second fixing frame; 121. positioning a groove; 13. a first fixed column; 14. a second fixed column; 15. a battery positioning hole; 151. a heat dissipation gap; 16. a first through hole; 17. a positioning column; 18. heat dissipation holes; 19. a bump; 2. a conductive sheet; 21. a conductive portion; 22. a bending section; 23. welding the part; 24. positioning holes; 3. a confluence sheet; 31. a second through hole; 32. a first bus bar; 321. a first bus terminal; 322. a bending section; 323. a wiring portion; 33. a second bus bar; 331. a second bus terminal; 332. a wiring hole; 34. a gap; 4. a battery pack; 5. a circuit board; 51. a connecting element; 6. a battery module is provided.

Detailed Description

The present invention will now be described in more detail with reference to the accompanying drawings, and it is to be understood that the following description of the present invention is made only by way of illustration and not by way of limitation with reference to the accompanying drawings. The various embodiments may be combined with each other to form other embodiments not shown in the following description.

In the description of the present invention, it should be noted that, for the orientation words, if there are terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and positional relationship indicated are based on the orientation or positional relationship shown in the drawings, and only for the convenience of describing the present invention and simplifying the description, it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and not be construed as limiting the specific scope of the present invention.

Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and in the description of the invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "assembled", "connected", and "connected", if any, are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; the two elements can be directly connected or connected through an intermediate medium, and the two elements can be communicated with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

As shown in fig. 1 to 6, the bus bar for a battery module according to the present embodiment includes a body for electrically connecting to electrode surfaces of electric cells and/or electric core groups, and a bus bar terminal; a bus terminal for connection with a circuit board; the bus bar terminal has a partial structure extending in a lateral direction toward the circuit board, and includes a bent portion 22 bent in a lateral direction and a wire connecting portion 323 for wire connection. The bus bar 3 of the embodiment is connected with the positive and negative terminals of the battery cell or the battery core group or the battery group through the conducting strips, so that the current expansion effect can be achieved, the bus bar further comprises a body and a bus bar terminal, the bus bar terminal is used for leading out the current on the conducting strips 2 and the bus bar 3 onto the circuit board 5, in order to enhance the shock resistance, the bus bar terminal comprises a transverse bending part 322 and a wiring part 323 for wiring, the transverse bending part of the bus bar terminal can buffer the impact force in the vertical direction, the shock absorption effect is achieved, and the leakage of the wiring part of the battery module 6 and the circuit board 5 is prevented; in addition, in practical applications, the bending portion 322 of the present embodiment bends toward the battery, i.e., toward the circuit board 5, so as to make the wiring portion 323 closer to the circuit board 5, thereby reducing the volume of the circuit board 5 and the cost of the circuit board 5.

In order to facilitate the processing and reduce the leakage at the welding position, the body and the bus terminal of the embodiment are integrally formed by the same material to form the integrated bus sheet 3, and the bending portion 322 needs to be made of a deformable material, so the bus sheet 3 can be made of a material with a certain deformation capability, the copper material has a certain deformation capability, and meets the use requirement, and of course, other deformable conductive materials can also be used as the material of the bus sheet 3. Preferably, the bus terminal of the present embodiment may be of an "N" type.

The utility model also provides a battery pack, including at least one battery module, the battery module includes at least two electric cores and/or electric core groups, insulation fixing frames and conducting strips which are connected in series or in parallel, the insulation fixing frames are used for supporting and fixing the electric cores and separating the electric cores from each other, so that the electric cores are not contacted with each other; the battery module further comprises at least two bus plates, the bus plates are connected with the outer side electrodes of the battery module through conducting plates and connected to the circuit board through bus terminals, and the bus terminals at least partially extend transversely to the circuit board.

The cell in the embodiment refers to a single electrochemical cell containing a positive electrode and a negative electrode; the battery cell group refers to a structure that a plurality of battery cells which are not in contact with each other are connected in series or in parallel.

The bus terminal of the embodiment has an elastic effect because of the bending part with the transverse bending, so that the circuit board is elastically installed relative to the battery cell or the battery cell group, and additional vibration resistance is realized.

In another embodiment, the battery assembly includes at least one battery module, wherein the battery module 6 includes a plurality of batteries, an insulating fixing frame 1 and conducting strips 2, the insulating fixing frame 1 is used for fixing the batteries, two bus bars 3 are respectively connected with two ends of the circuit board 5, and the bending part 322 bends and extends towards the circuit board 5; the confluence piece 3 is arranged outside the insulating fixing frame 1 and is connected with the conducting piece 2; the bending part 322 of the bus terminal is arranged outside the insulating fixing frame 1, and a gap 34 is arranged between the bending part 322 of the bus terminal and the insulating fixing frame 1, the gap 34 provides a buffer space for the bending part 322 of the bus terminal, and the shock absorption capacity of the bus terminal with the bending part which is transversely bent is further enhanced.

The battery of the embodiment refers to a structure including a battery cell, a protection circuit and a housing; the battery pack refers to a structure in which a plurality of battery packs are connected in series or in parallel.

The bus terminals in both embodiments described above can be electrically and mechanically connected to the circuit board at the same time by the connecting member 51; the bus bar terminal is fixed to the connecting member 51 by a rivet joint (not shown), the connecting member extends toward the bus bar terminal and includes a wiring surface parallel to the wiring portion of the bus bar terminal, so that the bus bar terminal is mechanically connected to the connecting member, and the stability of the current is also ensured.

In addition, in order to cope with different application scenarios, the two embodiments define the bus bar piece 3 of the bus bar terminal with the bent portion as the first bus bar piece 32, and the bus bar terminal with the bent portion as the first bus bar terminal 321 for connecting with two ends of the circuit board 5. When the battery assembly includes more than two battery modules 6, the adjacent battery modules 6 are connected in series, at this time, the bus bar 3 further includes a second bus bar 33, the second bus bar 33 includes a second bus terminal 331 and a second body, and the second bus terminal 331 is parallel to the second body; the second bus bars 33 are disposed at the side where the adjacent battery modules 6 are close to each other, and are connected in series with each other. When the adjacent battery modules 6 need to be connected in series, the second bus terminal 331 of one battery module 6 is attached to the second bus terminal 331 of another battery module 6 and can be connected through a short conducting wire, preferably, the second bus terminal 331 is provided with a wiring hole 332, when the two second bus terminals 331 are attached, the conducting wire passes through the wiring hole 332 and can be connected with the two second bus pieces 33, and then the two battery modules 6 are connected in series. When there are three battery modules 6, four second bus bars 33 are required, and when there are N battery modules 6, (2 × N-2) second bus bars 33 are required. The positions of the serially connected second bus terminals 331 of each adjacent battery module 6 may be correspondingly overlapped, i.e., on the same straight line, so that the lead wires can conveniently pass through the wiring holes 332 for connection; and the wiring positions of the first bus terminal 321 and the circuit board 5 and the positions of the second bus terminal 331 are staggered in parallel, so that the circuit board 5 can be installed and connected mechanically, and the labor cost is reduced.

Preferably, in order to enable the bus bar 3 to have a better current spreading effect and be less prone to electric leakage, the bus bar 3 of the present embodiment is located between the conducting plate 2 and the insulating fixing frame 1, the conducting plate 2 is fixedly connected with the insulating fixing frame 1 to position the bus bar 3, and the conducting plate 2 is attached to the bus bar 3; the conductive portions 21 on the conductive sheet 2 are used to electrically connect to the electrode terminals of the battery.

A plurality of batteries are arranged side by side to form a battery pack 4 or a plurality of battery cells are arranged at intervals to form a battery core group, the positive and negative electrodes of the batteries are uniformly arranged, the conducting strips 2 are respectively electrically connected with the positive and negative output ends of the battery pack 4, one battery module 6 of the embodiment comprises two conducting strips 2 and two converging sheets 3, one conducting strip 2 and one converging sheet 3 form a group and are arranged at the positive output end or the negative output end of the battery pack 4, and the converging sheets 3 have the function of enabling the conducting strips 2 to bear larger current and preventing the conducting strips 2 from being fused and damaged; compare prior art with the piece 3 that converges place in the conducting strip 2 outside and welded way, this embodiment will converge piece 3 centre gripping between insulating mount 1 and conducting strip 2, with conducting strip 2 and the fixed back of insulating mount 1, conducting strip 2 and the laminating of piece 3 that converges, because conducting strip 2 and the piece 3 that converges all adopt conducting material to make, can carry out current transmission. The conducting plate 2 can adopt a thinner nickel sheet or a copper-steel composite sheet, and the converging plate 3 can adopt a copper sheet or a copper alloy sheet; the bus sheet does not need to be welded with the conducting sheet, the process is simplified, the bus sheet is not exposed any more, the bus terminal on the bus sheet can be far away from an external conducting material, and the contact short circuit is avoided.

More specifically, the conductive plate 2 is fixed to the insulating fixing frame 1 in the following manner: the side of the insulating fixing frame 1 facing the conducting plate 2 is provided with a positioning column 17, the conducting plate 2 is provided with a corresponding positioning hole 24, and the positioning column 17 penetrates through the confluence plate 3 and is positioned in the positioning hole 24 to fix the conducting plate 2 and the confluence plate 3. During the installation, will converge piece 3 earlier and paste to insulating mount 1, be equipped with the hole on the piece 3 that converges, reference column 17 passes the hole, makes piece 3 that converges can be fixed a position on insulating mount 1, then, is close to piece 3 that converges with conducting strip 2, and reference column 17 passes locating hole 24, and conducting strip 2 and the piece 3 laminating that converges, this moment, as long as with reference column 17 with locating hole 24 welding can. The structure can also align the bus bar 3 and the conducting strip 2, and is convenient to install. And then the conducting parts of the conducting plates are respectively spot-welded with the positive and negative ends of the battery, so that the conducting plates are fixed, and meanwhile, the confluence plate is fixed, and at the moment, no welding point exists between the confluence plate and the conducting plates, so that the assembly process is reduced. Meanwhile, the bus terminal on the bus sheet is far away from conductive materials possibly existing outside and is directly contacted with the circuit board, so that contact short circuit is effectively avoided, and the use is safer. The battery module is generally arranged in the cavity, and sometimes, in order to ensure that the battery module can perform good heat dissipation, the cavity is made of a metal section bar with high thermal conductivity, such as an aluminum section bar, so that the bus bar is clamped between the conducting strip and the insulating fixing frame, the bus bar terminal of the bus bar is far away from the conductive heat dissipation cavity, and the contact short circuit between the bus bar terminal and the cavity is avoided.

Because the confluence piece 3 and the insulating fixing frame 1 are positioned between the conducting piece 2 and the battery, and the conducting part 21 of the conducting piece 2 needs to be connected with the positive pole or the negative pole of the battery, the insulating fixing frame 1 is provided with the first through hole 16, and the confluence piece 3 is provided with the second through hole 31; the first through hole 16 and the second through hole 31 each correspond to the conductive portion 21; the conductive portion 21 is electrically connected to the electrode of the battery through the first through hole 16 and the second through hole 31; the conductive portion 21 includes a bent portion 22 bent toward the insulating fixing frame 1 and a soldering portion 23 for soldering with an electrode of the battery. Conductive part 21 and conducting strip 2 are same conducting material integrated into one piece, when the preparation, can cut conductive part 21 corresponding part, and then the punching press becomes like the shape shown in the drawing, and of course, the shape shown in the drawing is only a shape of conductive part 21, is not the restriction to the shape of this embodiment conductive part 21, and other usable conventional shapes are all in the utility model discloses a protection scope.

In order to ensure the safety of the battery module 6, the bent portion 22 of the conductive portion 21 includes a fusing portion having a narrow width, which can be fused in time when the current is excessive, and thus functions as a fuse. In order to reduce the material and cost, the second through hole 31 on the bus bar 3 of the embodiment is a square hole, so that the current is ensured to be enlarged, the material consumption of the bus bar 3 is reduced, and the cost is lower.

The heat dissipation problem of the battery pack 4 is also an important factor influencing the operation of the battery module 6, and therefore, the heat dissipation holes 18 are correspondingly formed in the bus bar 3, the conductive plate 2 and the insulating fixing frame 1 to circulate the heat generated by the battery pack 4.

In order to improve the heat dissipation effect, the structure of the insulating fixing frame 1 is also very important, in this embodiment, the insulating fixing frame 1 includes a first fixing frame 11 and a second fixing frame 12, the first fixing frame 11 is used for fixing one end of the battery, and the second fixing frame 12 is used for fixing the other end of the battery; the first fixing frame 11 and the second fixing frame are oppositely arranged and clamped with each other to fix the battery, and the first fixing frame 11 and the second fixing frame 12 are fixedly connected with two ends of the battery to form a semi-open structure, so that the heat dissipation of the battery is facilitated; the first fixing frame 11 and the second fixing frame 12 are provided with battery positioning holes 15, the batteries are arranged behind the battery positioning holes 15 and are not close to each other but are arranged at intervals to form heat dissipation gaps 151, and the heat dissipation gaps 151 can be further communicated with the heat dissipation holes 18 to further guide heat out, so that overheating of the batteries is effectively avoided.

As shown in the drawings, a positioning structure is disposed between the first fixing frame 11 and the second fixing frame 12 of the present embodiment, and more specifically, the positioning structure includes an extension block 112, a positioning groove 121 and a positioning insertion block 111, the positioning groove 121 and the positioning insertion block 111 are respectively disposed on different extension blocks 112, and the positioning groove 121 and the positioning insertion block 111 are oppositely disposed and inserted to connect the first fixing frame 11 and the second fixing frame 12. As shown in the drawings, the positioning slot 121 and the positioning insertion block 111 are correspondingly arranged, for example, when the positioning slot 121 is arranged on the left extension block 112 of the first fixing frame 11, the positioning insertion block 111 is arranged on the left extension block 112 of the second fixing frame 12 corresponding to the positioning slot 121, and the positioning insertion block 111 is inserted into the positioning slot 121, so that the extension blocks 112 of the first fixing frame 11 and the second fixing frame 12 are connected and positioned, and the first fixing frame 11 and the second fixing frame 12 can be respectively provided with more than 2 extension blocks 112, more specifically, when there are only two extension blocks 112 on the first fixing frame 11 and the second fixing frame 12, the extension blocks 112 can be correspondingly arranged at the middle positions of two sides of the first fixing frame 11 and the second fixing frame 12, both the positioning slots 121 can be arranged on two extension blocks 112 on the first fixing frame 11, or one row of the positioning slot 121 can be arranged on one extension block 112, and the positioning insertion block 111 is arranged on the other extension block, the extension block 112 of the second fixing frame 12 is arranged corresponding to the first fixing frame 11, and the positions of the positioning slot 121 and the positioning insertion block 111 can be interchanged, so long as the first fixing frame 11 and the second fixing frame 12 are firmly connected; when the number of the extension blocks 112 on the first fixing frame 11 and the second fixing frame 12 is four, as shown in the drawing, the extension blocks 112 are disposed near four corners of the first fixing frame 11 and the second fixing frame 12, four extension blocks 112 on the first fixing frame 11 may all be provided with positioning slots 121, one extension block 112 may be provided with a positioning slot 121, the other extension blocks 112 are provided with positioning insertion blocks 111, two of the extension blocks 112 may be provided with positioning slots 121, the remaining two extension blocks 112 may be provided with positioning insertion blocks 111, three of the extension blocks may be provided with positioning slots 121, the remaining one extension block 112 may be provided with positioning insertion blocks 111, or four extension blocks 112 may all be provided with positioning insertion blocks 111, and the extension block 112 on the second fixing frame 12 corresponds to the first fixing frame 11; of course, the number and arrangement of the extending blocks 112 on the first fixing frame 11 and the second fixing frame 12 may also have other combinations, which are not limited by the drawings and the above description, as long as the first fixing frame 11 and the second fixing frame 12 can be firmly connected.

The two side faces of the first fixing frame 11 and the second fixing frame 12 facing the side wall of the heat dissipation cavity are provided with the convex blocks 19, so that the battery module 6 is always kept at a certain distance from the heat dissipation cavity, and the conductive material of the battery module 6 is prevented from being in contact with the heat dissipation cavity to cause short circuit.

In order to install the insulating fixing frame 1, a fixing column is arranged on the outer side of the insulating fixing frame 1. The fixing posts include first fixing posts 13 for mounting the circuit board 5, and second fixing posts 14 for fixing the insulating fixing bracket 1 to the heat dissipating case.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. A bus bar for a battery module, comprising

The body is used for being electrically connected with the electrode surface of the battery cell and/or the battery cell group;

a bus terminal for connection with a circuit board;

2. The bus bar for battery modules according to claim 1, wherein: the body and the bus bar terminal are integrally formed.

3. The bus bar for battery modules according to claim 1 or 2, wherein: the cross section of the bus terminal is N-shaped; the bending part is made of deformable materials.

4. A battery assembly comprises at least one battery module, and is characterized in that the battery module comprises at least two battery cores and/or a battery core group which are connected in series or in parallel, an insulation fixing frame and a conducting strip, wherein the insulation fixing frame is used for supporting and fixing the battery cores and separating the battery cores from each other so that the battery cores are not in contact with each other; the bus bar of claim 1, further comprising at least two bus bars connected to the outer electrodes of the battery modules through the conductive sheets and connected to a circuit board through the bus terminals, and the bus terminals at least partially extending laterally toward the circuit board.

5. The battery assembly of claim 4, wherein: the bending part of the bus terminal is arranged outside the insulating fixing frame, and a gap is formed between the bending part and the horizontal plane of the insulating fixing frame.

6. A battery assembly comprises at least one battery module, and is characterized in that the battery module comprises a plurality of batteries, an insulating fixing frame and a conducting strip, wherein the insulating fixing frame is used for fixing the batteries; the bus bar further comprises at least two bus bars as claimed in claim 1, wherein the two bus bars are respectively connected with two ends of the circuit board, and the bending part is bent and extended towards the direction of the circuit board; the collector plate is arranged on the outer side of the insulating fixing frame and is connected with the conducting plate; the bending part of the bus terminal is arranged outside the insulating fixing frame and a gap is arranged between the bending part of the bus terminal and the insulating fixing frame.

7. The battery assembly of claim 4 or 6, wherein: the bus terminal is electrically and mechanically connected to the circuit board through a connecting member; the bus bar terminal is fixed to the connecting member by a rivet joint.

8. The battery assembly of claim 4 or 6, wherein: the battery module comprises at least two battery modules, wherein the adjacent battery modules are connected in series; the bus bar piece further comprises a second bus bar piece, the second bus bar piece comprises a second bus terminal and a second body, and the second bus terminal is parallel to the second body; the second bus bar pieces are arranged on one side, close to the adjacent battery modules, and are connected in series.

9. The battery assembly of claim 8, wherein: the second bus terminals of the adjacent second bus pieces are correspondingly overlapped and connected in series; the bus terminals connected with the two ends of the circuit board and the second bus terminals are arranged in a staggered mode.

10. The battery assembly of claim 4 or 6, wherein: the bus bar is positioned between the conducting plate and the insulating fixing frame, the conducting plate is fixedly connected with the insulating fixing frame to position the bus bar, and the conducting plate is attached to the bus bar; and the conductive part on the conductive sheet is used for being electrically connected with the electrode end of the battery.