CN222813874U - A battery module and electrical equipment - Google Patents

Abstract

The utility model discloses a battery module and electric equipment, and relates to the technical field of electric power storage, wherein the battery module comprises a shell, a battery pack and a connecting assembly, and a cavity is arranged in the shell; the battery pack comprises a plurality of electric cores which are arranged in a arrayed manner, the electric cores are provided with connecting parts, the connecting assembly comprises first connecting pieces which are arranged in an extending manner along the arrangement direction of the electric cores, the first connecting pieces are detachably connected with the connecting parts of the electric cores respectively, and the electric cores are electrically connected through the first connecting pieces. The battery module is characterized in that the first connecting sheet is additionally arranged on the battery module, the first connecting sheet is used for fixing the battery cells of the battery pack, the battery cells can be electrically connected through the first connecting sheet, wiring steps between the battery cells can be reduced, the internal structure of the battery module is simplified, the assembled battery pack is arranged in the shell, the shell has the functions of protecting and limiting the battery, and the battery module has the advantages of being convenient to assemble and disassemble and convenient to maintain.

Description

Battery module and electric equipment

Technical Field

The utility model relates to the technical field of power storage, in particular to a battery module and electric equipment.

Background

The current common mode of the lithium battery pack during assembly is welding, wherein resistance welding is one of the most widely applied assembly modes, resistance welding is suitable for welding steel shell cylindrical battery cell packs, such as small electric bicycle battery packs, energy storage batteries, household appliances and the like, and laser welding is suitable for welding square aluminum shell large single batteries or assembling welding of soft package batteries, such as welding of small electric bicycle battery packs, large electric bicycle battery packs, electric automobiles and large energy storage power supplies. The two assembling and connecting modes are the most common welding modes in lithium battery assembling, but the battery module subjected to welding has the problems that the battery core is difficult to disassemble and the maintenance is inconvenient.

Disclosure of utility model

The utility model mainly aims to provide a battery module and electric equipment, and aims to solve the problems that the existing battery module is difficult to disassemble and inconvenient to maintain.

In order to achieve the above object, the battery module according to the present utility model includes:

The shell is internally provided with a cavity;

The battery pack comprises a plurality of electric cores which are arranged in a arrayed manner, and the electric cores are provided with connecting parts;

The connecting assembly comprises first connecting pieces which extend along the arrangement direction of the electric cores, the first connecting pieces are detachably connected with the connecting parts of the electric cores respectively, and the electric cores are electrically connected through the first connecting pieces.

In an embodiment, the battery module further includes a plurality of first insulating plates, and the first insulating plates are disposed between adjacent cells.

In one embodiment, the connecting portion comprises connecting columns and nuts, the first connecting plates are provided with a plurality of first connecting holes along the arrangement direction of the electric cores, the connecting columns of the electric cores respectively penetrate through different first connecting holes, the nuts are in threaded connection with the connecting columns, and the nuts are in butt joint with one side surface, far away from the electric cores, of the first connecting plates.

In an embodiment, the battery module further comprises a collection assembly and a circuit board, the collection assembly is electrically connected with the circuit board, each electric core is respectively connected with the collection assembly and the circuit board, and the collection assembly is used for obtaining performance parameters of each electric core.

In one embodiment, the collecting assembly is electrically connected with the first connecting piece and the electric core respectively, the battery module further comprises an electric connecting wire, one end of the electric connecting wire is electrically connected with the circuit board, the other end of the electric connecting wire is provided with a mounting part, the mounting part is detachably connected with the first connecting piece, and the circuit board is electrically connected with the first connecting piece through the electric connecting wire.

In an embodiment, the battery module further comprises a plurality of groups of battery packs, wherein the plurality of groups of battery packs are arranged along the length direction of the shell, the plurality of groups of battery packs are electrically connected, and a plurality of battery cells of the battery packs are arranged along the width direction of the shell.

In an embodiment, the connecting assembly further comprises a second connecting piece, the second connecting piece is detachably connected with the connecting portions of all the battery cells of the battery packs adjacent to the middle portion, the battery cells of the battery packs arranged at the head end and the tail end are electrically connected through the first connecting piece, and the battery packs arranged at the middle portion are electrically connected through the second connecting piece.

In one embodiment, the battery module further includes a second insulating plate disposed between the adjacent battery packs, and/or,

The battery module further comprises a plurality of third insulating plates, and the plurality of third insulating plates are arranged on the outer surfaces of the plurality of battery packs.

In one embodiment, the battery module further includes at least one fixing band surrounding the outer circumferences of all the battery packs to abut each other, and/or,

The battery module further comprises a waterproof membrane, and the waterproof membrane is arranged on the outer surface of the shell.

The utility model also provides electric equipment, which comprises the battery module.

According to the technical scheme, the battery packs are formed by arranging the battery cells in the cavity of the shell, the first connecting plates of the connecting assembly are arranged along the arrangement direction of the battery cells, the first connecting plates are detachably connected with the connecting parts of the battery cells respectively, limiting is achieved on the battery cells by the first connecting plates, meanwhile, the battery cells are electrically connected through the first connecting plates, the first connecting plates are additionally arranged for fixing the battery cells of the battery packs, the battery cells can be electrically connected through the first connecting plates, wiring steps among the battery cells can be reduced, the internal structure of the battery module is simplified, the assembled battery pack is placed in the shell, the shell has the functions of protecting and limiting the battery, the battery module has the advantage of convenience in assembly, and in addition, the battery module has the advantages of convenience in disassembly and maintenance by disassembling and separating the battery cells from the first connecting plates.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of an embodiment of a battery module according to the present utility model;

Fig. 2 is a schematic view illustrating an internal structure of a battery module according to an embodiment of the present utility model;

Fig. 3 is a schematic view illustrating another internal structure of an embodiment of a battery module according to the present utility model;

Fig. 4 is an exploded view of a battery pack according to an embodiment of the present utility model.

Reference numerals illustrate:

1-shell, 11-cavity, 2-battery pack, 21-cell, 211-connection part, 3-connection component, 31-first connection sheet, 32-second connection sheet, 4-first insulation board, 5-circuit board, 6-connection wire, 7-second insulation board, 8-third insulation board, 9-fixing band, 101-first power supply and 102-second power supply line.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear are referred to in the embodiments of the present utility model), the directional indications are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture, and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B "including a scheme, or B scheme, or a scheme where a and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The utility model provides a battery module.

Referring to fig. 1 to 4, in an embodiment of the utility model, the battery module includes a housing 1, a battery pack 2 and a connection assembly 3, wherein a cavity 11 is disposed in the housing 1, the battery pack 2 includes a plurality of arranged battery cells 21, the battery cells 21 are provided with connection portions 211, the connection assembly 3 includes first connection pieces 31, the first connection pieces 31 extend along the arrangement direction of the battery cells 21, the first connection pieces 31 are detachably connected with the connection portions 211 of the battery cells 21, and the battery cells 21 are electrically connected through the first connection pieces 31.

In the above structure, the battery pack 2 is formed by arranging the battery cells 21, the battery pack 2 is arranged in the cavity 11 of the housing 1, the first connecting plates 31 of the connecting assembly 3 are arranged along the arrangement direction of the battery cells 21, the first connecting plates 31 are detachably connected with the connecting parts 211 of the battery cells 21 respectively, the first connecting plates 31 are used for limiting the battery cells 21, meanwhile, the battery cells 21 are electrically connected through the first connecting plates 31, the first connecting plates 31 are additionally arranged for fixing the battery cells 21 of the battery pack 2, the battery cells 21 can be electrically connected through the first connecting plates 31, the wiring steps between the battery cells 21 can be reduced, the internal structure of a battery module is simplified, the assembled battery pack 2 is placed in the housing 1, the housing 1 has the functions of protecting and limiting a battery, the battery module has the advantage of convenient assembly, and in addition, the battery module has the advantage of convenient disassembly and convenient maintenance by disassembling and separating the battery cells 21 from the first connecting plates 31, and the battery cells 21 of the battery pack 2 can be conveniently disassembled.

In an embodiment, the battery module further includes a plurality of first insulating plates 4, and the first insulating plates 4 are disposed between adjacent battery cells 21. The battery cells 21 of the battery pack 2 are mutually separated by the arrangement of the first insulating plates 4, direct electrical connection between the battery cells 21 can be prevented by the arrangement of the first insulating plates 4 between the battery cells 21, the risk of short circuit is reduced, in addition, heat can be generated in the process of charging and discharging the battery cells 21, the battery cells 21 can be isolated by the first insulating plates 4, heat accumulation is prevented, and the stable working temperature of the battery cells 21 is maintained. And the battery cell 21 may generate corrosive substances during the charge and discharge process, and the first insulating plate 4 may prevent the substances from damaging the battery cell 21 or other parts of the battery module. The first insulating plate 4 may also serve as a support structure between the cells 21, enhancing the overall stability and mechanical strength of the battery pack 2. The first insulating plate 4 can also protect the battery cell 21 from physical impact and vibration, and prolong the service life of the battery cell 21.

In an embodiment, the connection portion 211 includes a connection post and a nut, the first connection piece 31 is provided with a plurality of first connection holes along the arrangement direction of the battery cells 21, the connection post of each battery cell 21 respectively passes through different first connection holes, the nut is in threaded connection with the connection post, and the nut is abutted against a surface of one side of the first connection piece 31 away from the battery cell 21. The connecting column is easy to install with the nut, and only the connecting column is screwed with the nut to be connected, and the first connecting piece 31 and the battery core 21 are simultaneously in physical connection and electrical connection by enabling the nut to be abutted with the surface of one side, far away from the battery core 21, of the first connecting piece 31. The connection post and nut threaded connection allows multiple disassembly and reassembly, facilitating disassembly and maintenance of the cell 21. By tightening the nuts, a preload force can be applied to the first connecting piece 31, and the connection rigidity and stability between the first connecting piece 31 and the battery cell 21 can be improved. The connection of the connecting column and the nut can avoid welding or bonding, and the complexity and the cost in the manufacturing process are reduced.

In an embodiment, the battery module further includes an acquisition component and a circuit board 5, the acquisition component is electrically connected with the circuit board 5, each of the battery cells 21 is respectively connected with the acquisition component, and the acquisition component is used for acquiring performance parameters of each of the battery cells 21. Through utilizing the collection subassembly to acquire the performance parameter of electric core 21 to circuit board 5 acquires the state of charge of power battery group 2, for example gather the voltage of electric core 21, temperature, the electric current when charging and discharging etc. in real time, circuit board 522 can be according to the performance parameter of electric core 2131 that the collection subassembly obtained, voltage and electric current to electric core 2131 charge and discharge are adjusted, make each electric core 21 reach the balanced state of charge and discharge with circuit board 5, and then just can prevent to cause the damage to electric core 2131 because overcharging or overdischarging, reduce the condition that electric core 21 appears thermal runaway, make electric core 2131 realize steady charge and discharge, be favorable to the battery module to realize steady heat dissipation. The circuit board 5 may be used to operate a BMS (Battery MANAGEMENT SYSTEM) Battery management system, among other things.

The acquisition assembly comprises a voltage sensor, a current sensor and a temperature sensor, wherein the voltage sensor is respectively and electrically connected with the battery core 21 and the circuit board 5, the current sensor is respectively and electrically connected with the battery core 21 and the circuit board 5, the temperature sensor is arranged on the outer surface of the battery core 21, and the temperature sensor is electrically connected with the circuit board 5. The voltage value of the battery cell 21 is obtained through a voltage sensor, the current value of the battery cell 21 is obtained through a current sensor, the temperature value of the outer surface of the battery cell 21 is obtained through a temperature sensor, a data acquisition unit and a Central Control Unit (CCU) are arranged on the circuit board 5, the data are collected in real time and transmitted to the central control unit, and the central control unit evaluates the health condition of the battery cell 21, balances and controls the charging and discharging process of the battery cell 21 unit, predicts the service life of the battery cell 21, protects the battery cell 21 from adverse conditions and the like according to the received data; the battery module can be ensured to run under safe and stable conditions by arranging the circuit board 5 and the acquisition assembly, the service life of the battery module is prolonged, the energy utilization efficiency is improved, the battery module can run more stably, heat dissipation is realized by matching the battery module with heat dissipation insulating liquid, and the heat dissipation efficiency of the battery module can be improved.

In an embodiment, the collecting assembly is electrically connected with the first connecting piece 31 and the electric core 21 respectively, the battery module further comprises an electric connecting wire 6, one end of the electric connecting wire 6 is electrically connected with the circuit board 5, the other end of the electric connecting wire 6 is provided with a mounting part, the mounting part is detachably connected with the first connecting piece 31, and the circuit board 5 is electrically connected with the first connecting piece 31 through the electric connecting wire 6. Wherein, the installation department includes the metal ring, and the one end that the electrical connection line 6 kept away from circuit board 5 passes through the metal ring and realizes dismantling the connection with first connecting piece 31. Specifically, the metal ring passes through one of the first connection holes of the first connection piece 31 by using a bolt, and is locked by using a nut and the bolt, so that the metal ring is abutted against the first connection piece 31, the circuit board 5 is electrically connected with the first connection piece 31 by the electric connection wire 6, and the electric connection wire 6 and the first connection piece 31 can be conveniently disassembled by additionally arranging the mounting part. The metal ring can be made of copper material, and the copper material has good conductivity.

In an embodiment, the battery module further includes a plurality of groups of battery packs 2, the plurality of groups of battery packs 2 are arranged along the length direction of the housing 1, the plurality of groups of battery packs 2 are electrically connected, and a plurality of electric cells 21 of the battery packs 2 are arranged along the width direction of the housing 1. Specifically, the battery cells 21 of one group of battery packs 2 are connected in parallel through the first connecting sheet 31, and the plurality of groups of battery packs 2 are connected in series, so that the total capacity of the whole battery pack 2 can be increased by connecting the battery cells 21 in parallel. For example, if the capacity of a single cell 21 is 2Ah, then connecting two cells 21 in parallel can result in a total capacity of 4 Ah. The battery pack 2 can support a longer discharge time due to an increase in the total capacity. The number of cells 21 of the battery pack 2 may be increased or decreased as needed to accommodate different energy requirements. If one of the battery cells 21 has a problem, the other battery cells 21 of the battery pack 2 can still continue to operate, thereby improving the reliability of the entire battery module.

The series connection of the battery packs 2 can increase the total voltage of the whole battery module, and if the voltage of each battery pack 2 is 3.7V, the series connection of two battery packs 2 can obtain the total voltage of 7.4V. The series battery pack 2 does not change the capacity of the battery module, and thus the total capacity of the entire battery module remains unchanged. Since the series connection can increase the voltage of the battery module without changing the total capacity of the battery module, it is possible to provide higher energy output without increasing additional capacity. For electric equipment such as an electric vehicle or an electric tool which needs high voltage, the battery module formed by the series battery pack 2 can meet the high voltage requirement of the electric equipment.

In an embodiment, the connection assembly 3 further includes a second connection piece 32, the second connection piece 32 is detachably connected with the connection portions 211 of all the cells 21 of the battery packs 2 adjacent to the middle, the cells 21 of the battery packs 2 arranged at the head end and the tail end are electrically connected through the first connection piece 31, and the battery packs 2 are electrically connected through the second connection piece 32. The adjacent battery packs 2 in the middle are connected by a second connecting sheet 32, and the second connecting sheet 32 can realize physical connection and electrical connection between the battery packs 2, wherein the second connecting sheet 32 can be made of nickel-plated steel strip, which is a surface-treated steel material, and the performance of the nickel-plated steel strip is enhanced by plating a layer of nickel on the surface of the steel strip. The nickel layer provides additional protection against rust and corrosion of the steel strip, and the nickel has good electrical conductivity, enabling stable electrical connection between the battery packs 2. The first connecting piece 31 may be made of a nickel plated steel strip.

In one embodiment, the battery module further includes a second insulating plate 7, and the second insulating plate 7 is disposed between the adjacent battery packs 2. Wherein, the first insulating plate 4 and the second insulating plate 7 are made of insulating resin. The second insulating plate 7 can prevent accidental electrical connection between the different battery packs 2, thereby avoiding occurrence of short circuits. When the battery pack 2 fails, the second insulating plate 7 can provide a physical barrier, so that the risk of failure diffusion to other battery packs 2 is reduced, and the safety of the whole battery module is improved. The second insulating plate 7 may serve as a heat insulating material to help control heat transfer between the battery packs 2 and prevent heat accumulation. In addition, the second insulating plate 7 can simplify the maintenance and repair work of the battery pack 2, and the second insulating plate 7 can be used as separation identification between the battery packs 2, so that the operation of technicians is facilitated. The use of the second insulating plate 7 contributes to the modular design of the battery pack 2, so that the assembly and replacement of the battery pack 2 are more convenient.

In an embodiment, the battery module further includes a plurality of third insulating plates 8, and the plurality of third insulating plates 8 are disposed on the outer surfaces of the plurality of battery packs 2. The third insulating plate 8 is also made of insulating resin. The third insulating plate 8 can provide good electrical isolation, prevent the current inside the battery module from leaking to the outside, and reduce the risk of electric shock and the possibility of electrical short circuit. The battery module may generate high temperature or spark when overcharged, overdischarged or failed, and the third insulating plate 8 may serve as a barrier to slow down heat transmission and reduce safety risks. And the third insulating plate 8 may help to control heat generated when the battery is operated, and help to maintain the operating temperature of the battery module through proper heat conduction or insulation properties. Compared with other materials such as metal, the insulating resin has lighter weight, is favorable for lightening the weight of the whole battery module, and is favorable for lightening the design of the battery module. And the case 1 formed of the third insulating plate 8 may help to reduce electromagnetic interference between the battery module and other electronic devices. The third insulating plate 8, which is located at the side of the cell 21 where the connection part 211 is provided, should be provided with a through hole corresponding to the connection part 211 so that the connection part 211 can pass through the through hole. The insulating resin can comprise one or more of epoxy resin, polyester, polyurethane, organic silicon resin and polyimide alkyd resin.

In one embodiment, the battery module further includes at least one fixing band 9, and the fixing band 9 surrounds the outer circumferences of all the battery packs 2 so that the battery packs 2 are abutted against each other. The fixing band 9 is used to wrap the outer circumferences of the plurality of battery packs 2 one turn so as to abut each other between the battery packs 2, and it is possible to improve the connection stability between the battery packs 2. The fixing belt 9 can be a belt or an adhesive tape, wherein the adhesive tape can be a fiber adhesive tape, and the fiber adhesive tape has high tensile strength, can bear large tensile force, can bear high temperature and has good insulativity. Illustratively, the fixing bands 9 are provided at both the upper and lower parts of the battery packs 2, so that the connection stability between the battery packs 2 can be further improved.

In one embodiment, the battery module further includes a waterproof film provided on the outer surface of the case 1. The waterproof membrane can be made of polyvinyl chloride (PVC) materials, and the PVC materials have good waterproof performance, can effectively prevent moisture penetration, and can improve the waterproof performance of the battery module. In addition, the both ends of waterproof membrane are equipped with the opening, adopt waterproof glue to bond with casing 1 around the opening of waterproof membrane, through setting up the opening at the both ends of waterproof membrane, can conveniently repackage one deck waterproof membrane after the maintenance at the battery module to ensure that the battery module has good waterproof performance.

In an embodiment, the battery module further includes a first power supply 101 wire and a second power supply wire 102, one end of the first power supply 101 wire is electrically connected with the circuit board 5, the other end of the first power supply 101 wire is electrically connected with external electric equipment, one end of the second power supply wire 102 is electrically connected with the second connecting piece 32 of the battery pack 2 at the tail, and the other end of the second power supply wire 102 is electrically connected with the electric equipment. The shell 1 is provided with a wire outlet hole, and a first power supply 101 wire and a second power supply wire 102 penetrate through the wire outlet hole to be connected with external electric equipment. Wherein, the clearance between wire outlet hole and first power supply 101 line, the second power supply line 102 sets up the waterproof glue.

According to the technical scheme, the battery pack 2 is formed by arranging the battery cells 21, the battery pack 2 is arranged in the cavity 11 of the shell 1, the first connecting plates 31 of the connecting assembly 3 are arranged along the arrangement direction of the battery cells 21, the first connecting plates 31 are detachably connected with the connecting parts 211 of the battery cells 21 respectively, limiting of the battery cells 21 is achieved by the first connecting plates 31, meanwhile, electric connection between the battery cells 21 is achieved through the first connecting plates 31, the first connecting plates 31 are additionally arranged for fixing the battery cells 21 of the battery pack 2, the electric connection between the battery cells 21 can be achieved through the first connecting plates 31, the wiring steps between the battery cells 21 can be reduced, the internal structure of a battery module is simplified, the assembled battery pack 2 is placed in the shell 1, the shell 1 has the effects of protecting and limiting a battery, the battery module has the advantage of convenience in assembly, and in addition, the battery module has the advantages of convenience in disassembly and convenience in maintenance by disassembling and separating the battery cells 21 from the first connecting plates 31.

The utility model also provides electric equipment, which comprises a battery module, and the specific structure of the battery module refers to the embodiment, and because the electric equipment adopts all the technical schemes of all the embodiments, the electric equipment at least has all the beneficial effects brought by the technical schemes of the embodiments, and the details are not repeated here.

The electric equipment can comprise an electric bicycle, an electric motorcycle, energy storage equipment, household appliances and the like.

The foregoing description is only exemplary embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the present utility model.

Claims (10)

1. A battery module, comprising: A shell, wherein a cavity is provided inside the shell; A battery pack, the battery pack comprising a plurality of arranged battery cells, the battery cells being provided with a connecting portion; A connecting component, wherein the connecting component includes a first connecting piece, which is extended along the arrangement direction of the battery cells; the first connecting piece is detachably connected to the connecting parts of each of the battery cells; and the battery cells are electrically connected through the first connecting piece. 2 . The battery module as claimed in claim 1 , further comprising a plurality of first insulating plates, wherein the first insulating plates are arranged between adjacent battery cells. 3. The battery module as described in claim 1 is characterized in that the connecting part includes a connecting column and a nut; the first connecting plate is provided with a plurality of first connecting holes along the arrangement direction of the battery cells; the connecting columns of each of the battery cells pass through different first connecting holes respectively; the nut is threadedly connected to the connecting column, and the nut abuts against a surface of a side of the first connecting plate away from the battery cell. 4. The battery module according to claim 1 is characterized in that the battery module also includes a collection component and a circuit board, the collection component is electrically connected to the circuit board, each of the battery cells is electrically connected to the collection component, and the collection component is used to obtain performance parameters of each of the battery cells. 5. The battery module according to claim 4 is characterized in that the collection component is electrically connected to the first connecting piece and the battery cell respectively; the battery module also includes an electrical connection line, one end of which is electrically connected to the circuit board, and the other end of the electrical connection line is provided with a mounting portion, and the mounting portion is detachably connected to the first connecting piece; the circuit board is electrically connected to the first connecting piece through the electrical connection line. 6. A battery module as described in any one of claims 1 to 5, characterized in that the battery module also includes multiple battery groups, the multiple battery groups are arranged along the length direction of the shell; the multiple battery groups are electrically connected to each other; and the multiple battery cells of the battery group are arranged along the width direction of the shell. 7. The battery module as described in claim 6 is characterized in that the connecting component also includes a second connecting piece; the second connecting piece is detachably connected to the connecting parts of all the battery cells of the battery packs adjacent to the middle part; the battery cells arranged at the head end and the tail end are electrically connected through the first connecting piece, and the battery packs arranged in the middle part are electrically connected through the second connecting piece. 8. The battery module according to claim 7, characterized in that the battery module further comprises a second insulating plate, wherein the second insulating plate is disposed between adjacent battery groups; and/or, The battery module further includes a plurality of third insulating plates, and the plurality of third insulating plates are arranged on the outer surfaces of the plurality of battery packs. 9. The battery module according to claim 6, characterized in that the battery module further comprises at least one fixing belt, the fixing belt being wrapped around the periphery of all battery packs so that the battery packs abut against each other; and/or, The battery module further comprises a waterproof membrane, and the waterproof membrane is arranged on the outer surface of the shell. 10. An electrical device, characterized in that it comprises the battery module according to any one of claims 1 to 9.