CN214706169U

CN214706169U - Battery module and power supply device

Info

Publication number: CN214706169U
Application number: CN202120536831.6U
Authority: CN
Inventors: 陈军
Original assignee: Anker Innovations Co Ltd
Current assignee: Anker Innovations Co Ltd
Priority date: 2021-03-15
Filing date: 2021-03-15
Publication date: 2021-11-12
Anticipated expiration: 2031-03-15

Abstract

The application discloses a battery module and a power supply device, which relate to the technical field of power batteries and comprise an isolation plate, a plurality of busbars and a plurality of electric connecting wires, wherein the isolation plate is insulated and spaced between the busbars and a plurality of battery cores and comprises a plurality of wire passing holes, and the wire passing holes respectively and correspondingly expose electrode connecting points of the battery cores; the electric connection lines are respectively led out from the positive electrode wiring points and the negative electrode wiring points of the electric cores and connected to the corresponding bus bars; the multiple busbars are arranged in parallel, two outermost busbars are respectively a positive electrode leading-out busbar and a negative electrode leading-in busbar, and the middle busbars are all bridging busbars. The electric connecting line between the electric cores is formed by the bus bar and the electric connecting line, the electric connecting line and the electric cores are more convenient to connect and detach, welding with larger energy is not needed, internal damage of the electric cores cannot be caused, and meanwhile maintenance and replacement can be more convenient.

Description

Battery module and power supply device

Technical Field

The application relates to the technical field of power batteries, in particular to a battery module and a power supply device.

Background

With the development of new energy automobile industry and the increasing demand of lithium ion battery market, the pursuit of capacity performance and safety of lithium batteries is continuously improved, at present, most of large-capacity lithium batteries are composed of a single battery cell or a plurality of battery PACKs, when a battery module is combined by the battery cells, the positive electrode is connected with the positive electrode, the negative electrode is connected with the negative electrode, the positive electrode and the negative electrode are connected in series to be Packaged (PACK) and combined, when a battery module is formed by combining a plurality of or a plurality of battery cells or the battery is packaged in a Packaging (PACK) production process, the positive electrode conductor and the negative electrode conductor of the battery cells are used for transmission between the battery cells. Adopt crisscross connection process mode each other, carry out single nickel piece (or being called busbar) or the nickel strap of full page battery module size and carry out resistance pulse welding, realize the series-parallel connection synthesis between electric core and the electric core, satisfy the high-power design of battery module and the electric current carries out mutual transmission through nickel piece or nickel strap to carry out charge-discharge work.

However, when the conventional structure is used for welding the nickel strap and the battery core, the common resistance welding or other welding needs larger energy, and the larger energy is needed for ensuring sufficient electrical contact, so that the internal damage of the battery core is easily caused, and the maintenance and the replacement are inconvenient.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at overcomes not enough that ordinary busbar welding technique exists among the current battery module structure, provides a battery module and power supply unit, in order to realize above-mentioned purpose, the utility model discloses a following scheme is realized:

in a first aspect, the present application provides a battery module, including a plurality of electric cores, division board, a plurality of busbar and many electric connecting wire, wherein: the isolating plate is insulated and spaced between the busbars and the battery cells, and comprises a plurality of wire passing holes, and the wire passing holes respectively correspondingly expose electrode wiring points of the battery cells; the electric connection lines are respectively led out from the positive electrode wiring points and the negative electrode wiring points of the battery cells and connected to the corresponding bus bars.

According to an embodiment of the present application, two outermost busbars of the plurality of busbars are a positive-pole leading-out busbar and a negative-pole leading-in busbar, and the middle busbars are all bridging busbars.

According to an embodiment of the present application, the plurality of electrical connection lines are conductors blown off by an overcurrent.

According to an embodiment of the present application, the plurality of electrical connection wires are aluminum wires with a diameter greater than or equal to 0.3 mm.

According to an embodiment of the application, each bus bar is an aluminum bar, the thickness of the bus bar is T, the width of the bus bar is W, wherein T is larger than or equal to 0.1mm, and W is larger than or equal to 0.2 mm.

According to an embodiment of the application, the line passing hole of the isolation plate comprises a positive line passing hole and a negative line passing hole, and the positive line passing hole and the negative line passing hole are different in shape.

According to an embodiment of the application, a plurality of electric core is arranged into the multirow, and adjacent two rows misplace between the electric core and put, and is a plurality of the busbar is the conductor that the wave extends.

According to an embodiment of the present disclosure, each of the battery cells is a cylindrical battery cell, and includes a first end and a second end, and a negative connection point and a positive connection point of the battery cell are both located at the first end; each of the battery cells is connected to the plurality of bus bars at the first end.

According to an embodiment of the present application, the bus bar further comprises an integrated circuit board located on one side of the end portion of each bus bar, and the integrated circuit board is connected to each bus bar through a plurality of electrical connection lines.

According to an embodiment of the application, the battery further comprises a first support and a second support, wherein the first support comprises a plurality of first positioning grooves which are respectively clamped and fixed at the first ends of the battery cells, and the second support comprises a plurality of second positioning grooves which are respectively clamped and fixed at the second ends of the battery cells; the plurality of battery cells are fixed between the first support and the second support.

According to an embodiment of the application, battery module the bus bar still has attached outward first apron, each the second end of electricity core still is attached outward to have the second apron.

In another aspect, the present application provides a power supply device including one or more battery modules as described above.

Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:

in this embodiment battery module, carry out the connection of busbar and electrode wiring point with linking the electric connecting wire conductor, overcome above technical contradiction, and this electric connecting wire only need can switch on certain extent's operating current alright with satisfying the demand, and, keep apart with the division board between electric core electrode and electric connecting wire, thereby prevent that the electric connecting wire from surpassing the high fever or the naked light wave that operating current caused and reaching electric core, avoid the configuration direct influence electric core safety of electric connecting wire. And the electric connecting wire is an additional component, so that the subsequent replacement and maintenance can be facilitated, and therefore, the electric connecting wire can be selected to be a conductor material easy to weld.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 is an exploded view of a battery module according to a first embodiment of the present disclosure.

Fig. 2 is a schematic top view of a battery module according to a first embodiment of the present disclosure.

Fig. 3 is a schematic top view of a battery module according to a second embodiment of the present disclosure.

Description of reference numerals: a first cover plate 1; a bus bar 2; an electrical connection wire 21; a negative electrode pin 22; a positive electrode pin 23; a separator 3; a wire passing hole 31; a first support 4; a window 41; a first positioning groove 42; a stud 43; a plurality of cells 5; a positive electrode connection point 51; a negative connection point 52; a second bracket 6; a second positioning groove 61; a second cover plate 7; an integrated circuit board 8.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

For solving among the prior art battery module structure, the welding of nickel strap and electric core easily causes the technical problem of electric core internal damage, the applicant discovers, the main reason for causing of above-mentioned technical problem is that, the busbar that needs the welded all is the material such as the great nickel of intensity or steel with electric core electrode shell, and these materials are in order to reach structural strength or design maximum current, and the thick weight of general design for the welding degree of difficulty can not descend. The applicant proposes that the above technical contradiction can be overcome by using a connecting electric connecting wire conductor, the electric connecting wire can meet the requirements only by conducting a certain range of working current, and the electric connecting wire is an additional component, so that the subsequent replacement and maintenance can be facilitated, and therefore, the electric connecting wire can be selected to be a conductor material easy to weld.

Specifically, this application embodiment provides a battery module, can include a plurality of electric cores, division board, a plurality of busbar and many electric connecting wire, wherein: the isolation plate is insulated and spaced between the busbars and the battery cells, and comprises a plurality of wire passing holes, and the wire passing holes respectively correspondingly expose electrode wiring points of the battery cells; the electric connection lines are respectively led out from the positive electrode wiring points and the negative electrode wiring points of the electric cores and connected to the corresponding bus bars.

To facilitate a more visual understanding of the technical idea of the present application for solving the technical problems, the following description of exemplary embodiments of the present application will be made with reference to the accompanying drawings:

first embodiment

Fig. 1 is an exploded schematic view of a battery module according to a first embodiment of the present disclosure, as shown in the drawing, the battery module in this embodiment mainly includes a bus bar 2, a partition plate 3, a first bracket 4, a plurality of battery cells 5, and a second bracket 6. It is apparent to those skilled in the art that the components of the battery module package are not limited to the above composition, and are not limited thereto.

Wherein, the first constant head tank 42 of each electric core 5 first end can be fixed in the fixed joint of shaping difference joint in the first support 4, second support 6 includes the second constant head tank 61 of each electric core 5 second end of a plurality of difference joints, first support 4 and second support 6 pass through the fastener and counterpoint the assembly back, first constant head tank 42 and the combination of second constant head tank 61 are battery positioning bin, and the terminal surface still can correspond the corresponding constant head tank of the tip shape formation of electric core 5 in first constant head tank 42 and the second constant head tank 61 to fixed each electric core 5. The first bracket 4 and the second bracket 6 are structural frames of the battery module, and the first bracket 4 and the second bracket 6 can be injection molded by using industrial plastic (ABS), it is obvious to those skilled in the art that the first bracket 4 and the second bracket 6 can also be made of other flame retardant materials.

In this embodiment, the top surface of the first support 4 further has windows 41 corresponding to the battery cells 5, so that the electrodes of the battery cells 5 are exposed on the top surface of the first support 4, and the power supply connection assembly is electrically connected. The window 41 can also be divided into a round hole corresponding to the positive electrode of each battery cell 5 and a square window corresponding to the connection point of the steel shell of the battery cell 5, and one square window can also expose two adjacent connection points of the negative electrode of the steel shell of the battery cell.

The battery module in this embodiment of the application mainly includes division board 3, a plurality of busbar 2 and a plurality of electricity connecting wire 21, wherein: the isolation plate 3 is insulated and spaced between the plurality of busbars 2 and the plurality of battery cells 5, the isolation plate 3 comprises a plurality of wire through holes 31, and each wire through hole 31 correspondingly exposes each electrode connection point of the battery cell 5. The electric connection lines 21 are led out from the positive electrode connection points and the negative electrode connection points of the electric cores 5 respectively and are connected to the corresponding bus bars 2. The battery modules are connected in series and in parallel, and form an external power supply contact through the bus bar 2, and the whole battery module is assembled into an electric connection assembly of the battery module.

In this embodiment, the material of the isolation board 3 can be selected from epoxy board, glass fiber board, carbon fiber board, inorganic ceramic fiber, aerogel felt, composite silicate board, composite silicate pipe, strong fire-retardant silica gel foam, foam coated with fireproof insulating paint, and other materials. The material is selected to be an insulating and flame-retardant isolating material, and the isolating plate is used for isolating the cell electrode from the electric connecting wire 21, so that high heat or open fire caused by the fact that the electric connecting wire 21 exceeds working current is prevented from reaching the cell, and the cell safety is prevented from being directly influenced by the configuration of the electric connecting wire 21.

Fig. 2 is a schematic top view of a battery module according to a first embodiment of the present disclosure, in which a partition plate 3 is blanked so as to display a connection relationship between a bus bar and a connection point of a cell electrode, and referring to fig. 1, in this embodiment, the bus bar 2 is a long strip-shaped conductive metal sheet, specifically, a nickel sheet, which can be formed by stamping or cutting. The bus bar 2 mainly extends along the extending direction of the cells 5 in the same row, so as to connect one of the polarity electrodes of the cells 5 in the whole row in parallel. In this embodiment, seven linear strip-shaped busbars 2 are configured for six rows of electric cores 5, two busbars 2 located at two sides are externally connected positive connection busbars and negative connection busbars 2 respectively, and five busbars 2 in the middle are busbars 2 for realizing series-parallel connection and bridging. The term "bridging" refers to a structure formed by a bus bar 2 between two rows of battery cells 5, wherein one polarity electrode of the battery cells 5 in the whole row is connected to the bus bar 2 through a plurality of electrical connection wires 21, and then a plurality of electrical connection wires 21 are connected to the other polarity electrode of the battery cells 5 in the next row, the battery cells 5 in the whole row are connected in series in sequence, and the battery cells 5 in each row are connected in parallel.

The first bus bar 2 may be provided with a negative pin 22, the last bus bar 2 may be provided with a positive pin 23, and the negative pin 22 and the positive pin 23 may be connecting sheets formed by bending the bus bars 2 in the vertical direction, so as to be welded and electrically connected by an external connecting wire. The first busbar 2 is connected with the negative connecting points 52 of the first row of battery cells 5 through a plurality of electric connecting lines 21, and the positive connecting points 51 of the first row of battery cells 5 are connected with the second busbar 2 through a plurality of electric connecting lines 21, so that the whole rows are connected in series in sequence until the positive connecting points 51 of the last row of battery cells 5 are connected with the last busbar 2 through a plurality of electric connecting lines 21, and series-parallel connection is completed.

According to an embodiment of the present application, the electrical connection wires 21 are conductors blown by overcurrent. Therefore, the overcurrent protection is realized, and important protection is provided for the safety of the battery cell and the circuit assembly. More specifically, the electric connection wires 21 can be selected from aluminum wires with a diameter greater than or equal to 0.3mm, so as to be better matched with a 18650 lithium battery cell, just conduct the working current of the cell, and can be better, quickly and laborsavingly welded by laser. On the other hand, each bus bar 2 can also be an aluminum bar, the thickness of the bus bar 2 is T, the width of the bus bar is W, wherein T is more than or equal to 0.1mm, and W is more than or equal to 0.2 mm.

According to an embodiment of the application, the first cover plate 1 is attached to the battery module electrical connection assembly, the first cover plate 1 can be sleeved and assembled with the stud 43 aligned to the top surface of the first bracket 4 through the through hole in the first cover plate 1, and the stud 43 can be fixed with an external component through a fastener. On the other hand, a second cover plate 7 is attached to the bottom surface of the second bracket 6 and abutted against the second end of each battery cell 5, so that the above components are combined to form a battery module package.

The welding of busbar and electrode can be realized to present aluminum wire welding laser welding process technology to this embodiment, and the effectual drawback that has solved current battery module resistance welding process and produces introduces aluminum wire welding laser welding process at the energy storage product, can effectually avoid ultrasonic bonding, the potential risk hidden danger of resistance weld, can improve product safety in utilization simultaneously. By adopting the aluminum wire welding laser welding process structure, the damaged battery can be independently repaired, and the damage to other batteries and the bus board can be avoided. Meanwhile, the battery can be conveniently replaced independently for the following reasons such as short circuit of a certain battery or unstable capacity and voltage. Consequently the utility model discloses have the function of protection group battery, be convenient for change damage battery and reduction in production cost, resources are saved.

Second embodiment

The separator 3 is blanked out so that the connection of the busbar to the cell electrode connection point can be displayed. The battery module in this embodiment also mainly includes a bus bar 2, a partition plate 3, a first bracket 4, a plurality of battery cells 5, and a second bracket 6 (components not shown in fig. 3 can refer to the structure in fig. 1).

In this embodiment, the main difference between the present embodiment and the first embodiment is that the multiple rows of cells 5 are arranged in a staggered manner, mainly because 18650 such cylindrical cells waste space if they are aligned, and the staggered arrangement in this embodiment can stagger the height points of the appearance of each row of cells. The arrangement can optimize the space setting, reduce the volume and facilitate the welding operation.

In this embodiment, therefore, a plurality of busbars 2 are selected as conductors extending in a wave shape. In this embodiment, the bus bar 2 is a long strip-shaped conductive metal sheet, preferably an aluminum sheet, and can be formed by stamping or cutting. Therefore, the electrodes of the staggered battery cells 5 can be aligned better, and the electric connecting wires 21 can be connected and welded nearby more conveniently.

On the other hand, the embodiment of the present application further includes a signal acquisition integrated circuit board 8 on one side of the end of each bus bar 2, and the integrated circuit board 2 is connected to each bus bar 2 through a plurality of electrical connection wires 21. For example, the bus bar 2 where the negative pin 22 is located extends to the penultimate bus bar 2, and each of the electrical connection lines 21 is connected to each of the bus bars 2, so as to collect electrical signals of each of the bus bars 2. Because module signal acquisition adopts the integrated collection mode of PCB or FPC to use aluminium silk and electric core to carry out laser welding. The reliability between the electric core and the electric core is guaranteed, the fuse function of each acquisition line can be guaranteed, and the battery has the advantages of high safety, convenience in production and the like.

In this embodiment, the aluminum wire laser welding process can weld the positive electrode and the negative electrode at the same time on a single surface, so that the stress on two surfaces of the negative electrode surface of the cell shell is avoided, and the deformation of the internal structure of the cell is avoided. Since the aluminum wire bonding surface in this embodiment is the positive electrode cap and the steel shell edge, the negative electrode does not need to be provided with the confluence welding, and a structure or a device which is more convenient for heat dissipation can be arranged, so that the heat dissipation efficiency of the battery module is better. In the embodiment, the welding connection is carried out on a single surface (the anode and the cathode of the battery cell are arranged at one end), so that when the battery cell is out of control due to heat, only one-way heat dissipation release is needed, and the structure is safer and simpler.

The embodiment of the application replaces the existing resistance welding or ultrasonic welding by the aluminum wire laser welding, can utilize the higher stability of the aluminum wire laser welding, enables the consistency of the output convergence of each electric core to be higher, and can prolong the whole cycle life.

When the battery module carries out large current or the current exceeds a set voltage value of a PCB (printed circuit board) and the battery core is in short circuit, the aluminum wire can be quickly cut off, the cutting-off time is within 0.5ms, the external short circuit can achieve the purposes that the battery core is not damaged and the risk of short circuit and fire is avoided;

aluminum wire technology welding method uses the high energy laser beam as the welding heat source, and aluminum wire laser welding technology welds and can guarantee that the heat dissipation is fast between electric core and the electric core, heat gathering is slow, the heat affected zone is narrow, welding stress and the welding body of being welded the face warp advantage such as little. The welding position of a welding spot on the aluminum wire and the welding position of the battery cell are determined by scanning the position of the battery cell required to be welded and the position of the aluminum wire on the aluminum plate at a high speed, and the laser heat is accurately controlled to be input to the welded surface of the aluminum wire and the battery cell.

On the other hand, the embodiment of the present application can also be regarded as providing a power supply device, which mainly comprises one or more battery modules as described above. It can be understood that the power supply device is a device which stores energy through charging of the battery module and supplies power to the load through discharging, and the power supply device mainly comprises an outdoor power supply, a mobile power supply or an energy storage battery and other products. It will be understood by those skilled in the art that the power supply device will also typically have common components such as an outer housing, a control circuit assembly or a protective battery assembly.

When the specific product of the embodiment of the application is manufactured, the following components can be combined and prepared respectively:

1. respectively installing the positive and negative electrode surfaces of a battery cell, and fixing the battery cell between a first bracket 4 and a second bracket 6;

2. then, laser welding an aluminum wire with the diameter of more than or equal to 0.3mm on an aluminum bar bus bar with the T (bus bar thickness) of more than or equal to 0.1mm and the W (bus bar width) of more than or equal to 0.2 mm;

3. the aluminum wires are respectively welded on the anode connection 51 component and the cathode connection point 52 at the edge of the steel shell;

4. then, a welding manipulator of the laser welding device is used for sending the welding head to the upper part of the battery to be welded;

5. the automatic feeding mechanism welds the battery pack and the aluminum wire, and the welding head assembly welds the aluminum wire on the bus board;

6. the positive electrode cap at one end of the battery is exposed outside through the round small hole on the isolating plate;

7. then respectively installing a positive bus bar and a negative bus bar on the outer sides of the positive cover cap assembly and the negative cover plate assembly, and placing the locked whole battery pack on a tray;

the utility model discloses mainly use the mode of aluminium wire welding laser welding process, make up the positive negative pole face of weld of electricity core in one end respectively, go on and establish ties. The current is transmitted between the collecting device and the battery cell through the bus bar, and the performance is stable. The consistency of the quality of the product is improved, and the hidden quality troubles that welding is abnormal and the working product cannot flow to the market due to the quality difference of the product are reduced.

The utility model discloses mainly be with an aluminium wire welding technology application to cylinder battery or group battery product, replace original ultrasonic welding, resistance-type pulse spot welding. Therefore, the comprehensive consistency of the product is improved, the aluminum wire laser welding process technology is applied to the cylindrical battery cell product, and the safety accidents of the battery cell caused by the spot welding process are reduced. Mainly realizes that an aluminum wire welding process technology replaces the original resistance type pulse welding process: the aluminum wire welding equipment device is simple in structure, the battery module can be designed according to the product form changes, the aluminum wire welding process practical in cooperation with the battery module and the operation between the single battery cores are convenient and fast to weld. The safety and reliability of the product are improved, and meanwhile, the application of the energy storage product can exert the maximum effect, and the product value is reflected.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a battery module, its characterized in that includes a plurality of electric cores (5), division board (3), a plurality of busbar (2) and many electric connecting wire (21), wherein:

the isolation plate (3) is insulated and spaced between the busbar (2) and the battery cells (5), the isolation plate (3) comprises a plurality of wire passing holes (31), and the wire passing holes (31) respectively correspondingly expose electrode wiring points of the battery cells (5);

the electric connecting wires (21) are respectively led out from the positive electrode connecting points (51) and the negative electrode connecting points (52) of the battery cores (5) and are connected to the corresponding bus bars (2).

2. The battery module according to claim 1, wherein the two outermost busbars (2) of the plurality of busbars (2) are a positive lead-out busbar and a negative lead-out busbar, respectively, and the middle busbars (2) are bridging busbars.

3. The battery module according to claim 1, wherein the plurality of electrical connection wires (21) are conductors that are fused by overcurrent.

4. A battery module according to claim 3, wherein the plurality of electrical connection wires (21) are aluminum wires having a diameter of 0.3mm or more.

5. The battery module according to claim 4, wherein each of the bus bars (2) is an aluminum bar, the bus bar thickness is T, and the bus bar width is W, wherein T is 0.1mm or more, and W is 0.2mm or more.

6. The battery module according to claim 1, wherein the wire through hole (31) of the separator (3) comprises a positive wire through hole and a negative wire through hole, and the positive wire through hole and the negative wire through hole are different in shape.

7. The battery module according to any one of claims 1 to 6, wherein a plurality of the battery cells (5) are arranged in a plurality of rows, two adjacent rows of the battery cells (5) are arranged in a staggered manner, and a plurality of the bus bars (2) are conductors extending in a wave shape.

8. The battery module of any of claims 1-6, wherein each of the cells is a cylindrical cell comprising a first end and a second end, and the negative connection point and the positive connection point are both located at the first end; each of the cells is connected at the first end to a plurality of the busbars (2).

9. The battery module according to claim 8, further comprising an integrated circuit board located at one side of the end of each of the bus bars (2), the integrated circuit board being connected to each of the bus bars (2) through a plurality of the electric connection wires (21), respectively.

10. The battery module according to claim 8, further comprising a first bracket (4) and a second bracket (6), wherein the first bracket (4) comprises a plurality of first positioning grooves for respectively clamping and fixing the first ends of the battery cells, and the second bracket (6) comprises a plurality of second positioning grooves for respectively clamping and fixing the second ends of the battery cells; the plurality of battery cells are fixed between the first bracket (4) and the second bracket (6).

11. The battery module according to claim 8, characterized in that a first cover plate (1) is attached to the busbar (2) of the battery module, and a second cover plate (7) is attached to the second end of each cell.

12. A power supply device comprising one or more battery modules according to any one of claims 1 to 11.