Battery module and electric equipment

Abstract

The utility model discloses a battery module and electric equipment, and relates to the technical field of electric power storage, the battery module comprises a shell, a battery pack and a connecting assembly, the shell is internally provided with a cavity; the battery pack comprises a plurality of battery cells which are arranged, and the battery cells are provided with connecting parts; the connecting assembly comprises a first connecting piece, and the first connecting piece extends in the arrangement direction of the battery cells; the first connecting sheet is detachably connected with the connecting part of each battery cell; and the battery cells are electrically connected through the first connecting sheets. According to the battery module disclosed by the utility model, the first connecting sheets are additionally arranged to fix the battery cells of the battery pack, and the battery cells can be electrically connected through the first connecting sheets, so that the wiring steps between the battery cells can be reduced, and the internal structure of the battery module is simplified; the assembled battery pack is placed in the shell, the shell has the effects of protecting and limiting the battery, and the battery module has the advantages of being convenient to disassemble, assemble and maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of power storage, in particular to a battery module and electrical equipment. Background Art

[0002] At present, the common method for assembling lithium battery packs is welding, among which resistance welding is one of the most widely used assembly methods; resistance welding is suitable for welding of steel shell cylindrical battery packs, such as small electric bicycle battery packs, energy storage batteries, household appliances, etc.; while laser welding is suitable for welding of large square aluminum shell monomers or assembly welding of soft-pack batteries, such as small electric bicycle battery packs, large electric vehicle battery packs, electric vehicles, and large energy storage power supplies. The above two assembly connection methods are the most commonly used welding methods in lithium battery assembly, but the welded battery module has the problem that the battery cell is difficult to disassemble and inconvenient to repair. Utility Model Content

[0003] The main purpose of the utility model is to provide a battery module and an electrical device, aiming to solve the problem that the existing battery module is difficult to disassemble and inconvenient to repair.

[0004] To achieve the above-mentioned purpose, the battery module proposed by the utility model comprises:

[0005] A shell, wherein a cavity is provided inside the shell;

[0006] A battery pack, the battery pack comprising a plurality of arranged battery cells, the battery cells being provided with a connecting portion;

[0007] 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.

[0008] In one embodiment, the battery module further includes a plurality of first insulating plates, wherein the first insulating plates are disposed between adjacent battery cells.

[0009] In one embodiment, the connecting part includes a connecting column and a nut; the first connecting piece 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 piece away from the battery cell.

[0010] In one embodiment, the battery module further 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.

[0011] In one embodiment, the acquisition 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 via the electrical connection line.

[0012] In one embodiment, the battery module further includes a plurality of battery packs, which are arranged along the length direction of the shell; the plurality of battery packs are electrically connected to each other; and a plurality of battery cells of the battery packs are arranged along the width direction of the shell.

[0013] In one embodiment, the connection assembly also includes a second connecting plate; the second connecting plate is detachably connected to the connecting parts of all battery cells of the adjacent battery packs in the middle; the battery cells arranged at the head end and the tail end are electrically connected through the first connecting plate, and the battery packs arranged in the middle are electrically connected through the second connecting plate.

[0014] In one embodiment, the battery module further includes a second insulating plate, wherein the second insulating plate is disposed between adjacent battery groups; and / or,

[0015] 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.

[0016] In one embodiment, the battery module further comprises at least one fixing belt, which surrounds the periphery of all battery packs so that the battery packs abut against each other; and / or,

[0017] The battery module further comprises a waterproof membrane, and the waterproof membrane is arranged on the outer surface of the shell.

[0018] The utility model also provides an electrical device, comprising the battery module as described above.

[0019] The technical solution of the utility model is to form a battery pack by arranging battery cells, wherein the battery pack is arranged in the cavity of a shell, and the first connecting piece of the connecting assembly is arranged along the arrangement direction of the battery cells, and the first connecting piece is detachably connected to the connecting parts of each battery cell, and the battery cells are limited by the first connecting piece, and the battery cells are also electrically connected through the first connecting piece; the first connecting piece is added to fix the battery cells of the battery pack, and the battery cells can be electrically connected through the first connecting piece, which can reduce the wiring steps between the battery cells and simplify the internal structure of the battery module; the assembled battery pack is placed in the shell, and the shell has a protective and limiting effect on the battery, and the battery module has the advantage of easy assembly; in addition, the battery cells of the battery pack can be disassembled by disassembling and separating the battery cells from the first connecting piece, and the battery module has the advantages of easy disassembly and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 A schematic structural diagram of an embodiment of a battery module provided by the utility model;

[0022] Figure 2 A schematic diagram of the internal structure of a battery module according to an embodiment of the present invention;

[0023] Figure 3 Another schematic diagram of the internal structure of a battery module according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the exploded structure of a battery pack of an embodiment of a battery module provided by the utility model.

[0025] Description of Figure Numbers:

[0026] 1-shell; 11-cavity; 2-battery pack; 21-battery cell; 211-connecting part; 3-connecting assembly; 31-first connecting piece; 32-second connecting piece; 4-first insulating plate; 5-circuit board; 6-connecting wire; 7-second insulating plate; 8-third insulating plate; 9-fixing belt; 101-first power supply; 102-second power supply line.

[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0031] The utility model provides a battery module.

[0032] See also Figures 1 to 4 In one embodiment of the utility model, the battery module includes a shell 1, a battery pack 2 and a connecting component 3, the shell 1 is provided with a cavity 11; the battery pack 2 includes a plurality of arranged battery cells 21, and the battery cells 21 are provided with connecting portions 211; the connecting component 3 includes a first connecting piece 31, and the first connecting piece 31 is extended along the arrangement direction of the battery cells 21; the first connecting piece 31 is detachably connected to the connecting portions 211 of each battery cell 21; and each battery cell 21 is electrically connected through the first connecting piece 31.

[0033] In the above structure, the battery pack 2 is formed by arranging the battery cells 21, and the battery pack 2 is arranged in the cavity 11 of the shell 1. The first connecting piece 31 of the connecting component 3 is arranged along the arrangement direction of the battery cells 21. The first connecting piece 31 is detachably connected to the connecting portion 211 of each battery cell 21, and the battery cells 21 are limited by the first connecting piece 31. At the same time, the battery cells 21 are also electrically connected through the first connecting piece 31. The first connecting piece 31 is added to fix the battery cells 21 of the battery pack 2, and the battery cells 21 can be electrically connected through the first connecting piece 31, which can reduce the wiring steps between the battery cells 21 and simplify the internal structure of the battery module. The assembled battery pack 2 is placed in the shell 1, and the shell 1 has the function of protecting and limiting the battery. The battery module has the advantage of easy assembly. In addition, by disassembling and separating the battery cells 21 and the first connecting piece 31, the battery cells 21 of the battery pack 2 can be disassembled. The battery module has the advantages of easy disassembly and maintenance.

[0034] In one embodiment, the battery module further includes a plurality of first insulating plates 4, which are arranged between adjacent battery cells 21. By providing the first insulating plates 4, the battery cells 21 of the battery pack 2 are separated from each other; the first insulating plates 4 are provided between the battery cells 21 to prevent direct electrical connection between the battery cells 21 and reduce the risk of short circuit. In addition, the battery cells 21 generate heat during the charging and discharging process, and the first insulating plates 4 can isolate the battery cells 21 to prevent heat accumulation, which helps to maintain a stable operating temperature of the battery cells 21. The battery cells 21 may generate corrosive substances during the charging and discharging process, and the first insulating plates 4 can prevent these substances from causing damage to the battery cells 21 or other parts of the battery module. The first insulating plates 4 can also serve as a supporting structure between the battery cells 21 to enhance the overall stability and mechanical strength of the battery pack 2. The first insulating plates 4 can also protect the battery cells 21 from physical shock and vibration, and extend the service life of the battery cells 21.

[0035] In one embodiment, the connection portion 211 includes a connection column and a nut; the first connection sheet 31 is provided with a plurality of first connection holes along the arrangement direction of the battery cells 21; the connection columns of each battery cell 21 pass through different first connection holes respectively; the nut is threadedly connected to the connection column, and the nut abuts against the surface of the first connection sheet 31 on one side away from the battery cell 21. The connection column and the nut are easy to install, and only the connection column and the nut need to be screwed together. By making the nut abut against the surface of the first connection sheet 31 on one side away from the battery cell 21, the first connection sheet 31 and the battery cell 21 are physically and electrically connected at the same time. The threaded connection of the connection column and the nut allows multiple disassembly and reassembly, which facilitates the disassembly, assembly and maintenance of the battery cell 21. By tightening the nut, a pre-tightening force can be applied to the first connection sheet 31, thereby improving the rigidity and stability of the connection between the first connection sheet 31 and the battery cell 21. The connection of the connection column and the nut can avoid welding or bonding, and reduce the complexity and cost in the manufacturing process.

[0036] In one embodiment, the battery module further includes a collection component and a circuit board 5, the collection component is electrically connected to the circuit board 5, and each battery cell 21 is electrically connected to the collection component, and the collection component is used to obtain the performance parameters of each battery cell 21. The performance parameters of the battery cell 21 are obtained by using the collection component, so that the circuit board 5 can obtain the state of charge of the power battery pack 2, for example, the voltage, temperature, current during charging and discharging of the battery cell 21, etc. are collected in real time. The circuit board 522 can adjust the voltage and current of the battery cell 2131 during charging and discharging according to the performance parameters of the battery cell 2131 obtained by the collection component, and the circuit board 5 is used to make each battery cell 21 reach a state of balanced charging and discharging, thereby preventing damage to the battery cell 2131 due to overcharging or overdischarging, reducing the thermal runaway of the battery cell 21, and making the battery cell 2131 realize stable charging and discharging, which is conducive to stable heat dissipation of the battery module. Among them, the circuit board 5 can be used to run a BMS (Battery Management System) battery management system.

[0037] The acquisition component includes a voltage sensor, a current sensor and a temperature sensor. The voltage sensor is electrically connected to the battery cell 21 and the circuit board 5 respectively; the current sensor is electrically connected to the battery cell 21 and the circuit board 5 respectively; the temperature sensor is arranged on the outer surface of the battery cell 21, and the temperature sensor is electrically connected to the circuit board 5. The voltage value of the battery cell 21 is obtained by the voltage sensor, the current value of the battery cell 21 is obtained by the current sensor, and the temperature value of the outer surface of the battery cell 21 is obtained by the temperature sensor. The circuit board 5 should be provided with a data acquisition unit and a central control unit (CCU). The data of the data acquisition unit is collected and transmitted to the central control unit in real time. The central control unit evaluates the health status of the battery cell 21, balances and controls the charging and discharging process of the battery cell 21, predicts the life of the battery cell 21, and protects the battery cell 21 from adverse conditions according to the received data. By setting the circuit board 5 and the acquisition component, it can ensure that the battery module operates under safe and stable conditions, prolong its service life, and improve energy utilization efficiency; make the battery module run more smoothly, and cooperate with the heat dissipation insulating liquid to achieve heat dissipation, which can improve the heat dissipation efficiency of the battery module.

[0038] In one embodiment, the collection component is electrically connected to the first connecting piece 31 and the battery cell 21 respectively; the battery module also includes an electrical connection line 6, one end of the electrical connection line 6 is electrically connected to the circuit board 5, and the other end of the electrical connection line 6 is provided with a mounting portion, and the mounting portion is detachably connected to the first connecting piece 31; the circuit board 5 is electrically connected to the first connecting piece 31 through the electrical connection line 6. Among them, the mounting portion includes a metal ring, and the end of the electrical connection line 6 away from the circuit board 5 is detachably connected to the first connecting piece 31 through the metal ring. Specifically, the metal ring is passed through one of the first connecting holes of the first connecting piece 31 by a bolt, and then locked by a nut and a bolt, so that the metal ring is abutted against the first connecting piece 31, so that the circuit board 5 is electrically connected to the first connecting piece 31 through the electrical connection line 6; by adding a mounting portion, the electrical connection line 6 and the first connecting piece 31 can be easily disassembled and assembled. The metal ring can be made of copper material, which has good electrical conductivity.

[0039] In one embodiment, the battery module further includes a plurality of battery packs 2, which are arranged along the length direction of the housing 1; the plurality of battery packs 2 are electrically connected; and a plurality of battery cells 21 of the battery pack 2 are arranged along the width direction of the housing 1. Specifically, the battery cells 21 of a group of battery packs 2 are connected in parallel through the first connecting piece 31, and the plurality of battery packs 2 are connected in series; the parallel battery cells 21 can increase the total capacity of the entire battery pack 2. For example, if the capacity of a single battery cell 21 is 2Ah, then a total capacity of 4Ah can be obtained by connecting two battery cells 21 in parallel. Due to the increase in total capacity, the battery pack 2 can support a longer discharge time. The number of battery cells 21 of the battery pack 2 can be increased or decreased as needed to meet 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 work, thereby improving the reliability of the entire battery module.

[0040] The series connection of battery packs 2 can increase the total voltage of the entire battery module; if the voltage of each battery pack 2 is 3.7V, a total voltage of 7.4V can be obtained by connecting two battery packs 2 in series. The series connection of battery packs 2 does not change the capacity of the battery module, so the total capacity of the entire battery module remains unchanged. Since the series connection can increase the voltage of the battery module while the total capacity of the battery module remains unchanged, it can provide higher energy output without adding additional capacity. For electrical equipment that requires high voltage, such as electric vehicles or power tools, the battery module formed by the series connection of battery packs 2 can meet the high voltage requirements of the electrical equipment.

[0041] In one embodiment, the connection assembly 3 further includes a second connection piece 32; the second connection piece 32 is detachably connected to the connection parts 211 of all the battery cells 21 of the adjacent battery packs 2 in the middle; the battery cells 21 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 the second connection piece 32, and the second connection piece 32 can achieve physical and electrical connections between the battery packs 2; wherein, the second connection piece 32 can be made of nickel-plated steel strip, which is a surface-treated steel material, and its performance is enhanced by plating a layer of nickel on the surface of the steel strip. The nickel layer can provide additional protection to prevent the steel strip from rusting and corrosion; and nickel has good electrical conductivity, which can achieve stable electrical connection between the battery packs 2. It should be noted that the first connection piece 31 can also be made of nickel-plated steel strip.

[0042] In one embodiment, the battery module further includes a second insulating plate 7, which is disposed between adjacent battery packs 2. The first insulating plate 4 and the second insulating plate 7 are both made of insulating resin. The second insulating plate 7 can prevent accidental electrical connection between different battery packs 2, thereby avoiding the occurrence of short circuits. When a battery pack 2 fails, the second insulating plate 7 can provide a physical barrier to reduce the risk of the fault spreading to other battery packs 2 and improve the safety of the entire battery module. The second insulating plate 7 can be used as an insulating material to help control heat transfer between battery packs 2 and prevent heat accumulation. In addition, the second insulating plate 7 can simplify the maintenance and repair of the battery pack 2, and the second insulating plate 7 can be used as a partition identification between battery packs 2 to facilitate the operation of technicians. The use of the second insulating plate 7 helps to achieve a modular design of the battery pack 2, making the assembly and replacement of the battery pack 2 more convenient.

[0043] In one embodiment, the battery module further includes a plurality of third insulating plates 8, which are arranged on the outer surface of the plurality of battery packs 2. Among them, the third insulating plates 8 are also made of insulating resin. The third insulating plates 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 sparks when overcharged, over-discharged or malfunctions. The third insulating plate 8 can serve as a barrier to slow down the spread of heat and reduce safety risks. The third insulating plate 8 can help control the heat generated when the battery is working, and through appropriate heat conduction or insulation performance, it helps to maintain the operating temperature of the battery module. Compared with other materials such as metal, insulating resin is lighter in weight, which helps to reduce the weight of the entire battery module and is conducive to the lightweight design of the battery module. The shell 1 formed by the third insulating plate 8 can help reduce electromagnetic interference between the battery module and other electronic devices. The third insulating plate 8 located on the side of the battery cell 21 where the connecting portion 211 is provided should be provided with a through hole corresponding to the connecting portion 211 so that the connecting portion 211 can pass through the through hole. The insulating resin may include one or more of epoxy resin, polyester, polyurethane, silicone resin, and polyimide alkyd resin.

[0044] In one embodiment, the battery module further includes at least one fixing belt 9, which is wrapped around the periphery of all battery packs 2 so that the battery packs 2 abut against each other. The fixing belt 9 is used to wrap around the periphery of multiple battery packs 2 so that the battery packs 2 abut against each other, which can improve the connection stability between the battery packs 2. The fixing belt 9 can be a tie band or an adhesive tape; the adhesive tape can be a fiber tape, which usually has a high tensile strength, can withstand large tensile forces, can withstand high temperatures, and has good insulation properties. Exemplarily, the upper and lower parts of the battery pack 2 are provided with fixing belts 9, which can further improve the connection stability between the battery packs 2.

[0045] In one embodiment, the battery module further includes a waterproof membrane, which is disposed on the outer surface of the housing 1. The waterproof membrane can be made of polyvinyl chloride (PVC) material, which has good waterproof properties and can effectively prevent water penetration, thereby improving the waterproof properties of the battery module. In addition, openings are provided at both ends of the waterproof membrane, and waterproof glue is used around the openings of the waterproof membrane to bond the housing 1. By providing openings at both ends of the waterproof membrane, it is convenient to re-wrap a layer of waterproof membrane after the battery module is repaired to ensure that the battery module has good waterproof properties.

[0046] In one embodiment, the battery module further includes a first power supply line 101 and a second power supply line 102, one end of the first power supply line 101 is electrically connected to the circuit board 5, the other end of the first power supply line 101 is electrically connected to an external electrical device, one end of the second power supply line 102 is electrically connected to the second connecting piece 32 of the battery pack 2 at the rear, and the other end of the second power supply line 102 is electrically connected to the electrical device. A wire outlet hole is provided on the housing 1, and the first power supply line 101 and the second power supply line 102 pass through the wire outlet hole to connect to the external electrical device. Among them, waterproof glue is provided in the gap between the wire outlet hole and the first power supply line 101 and the second power supply line 102.

[0047] The technical solution of the utility model is to form a battery pack 2 by arranging the battery cells 21, the battery pack 2 is arranged in the cavity 11 of the shell 1, and the first connecting piece 31 of the connecting component 3 is arranged along the arrangement direction of the battery cells 21. The first connecting piece 31 is detachably connected to the connecting portion 211 of each battery cell 21, and the battery cells 21 are limited by the first connecting piece 31. At the same time, the battery cells 21 are also electrically connected through the first connecting piece 31; the first connecting piece 31 is added to fix the battery cells 21 of the battery pack 2, and the battery cells 21 can be electrically connected through the first connecting piece 31, so that the wiring steps between the battery cells 21 can be reduced and the internal structure of the battery module can be simplified; the assembled battery pack 2 is placed in the shell 1, and the shell 1 has the function of protecting and limiting the battery, and the battery module has the advantage of easy assembly; in addition, by disassembling and separating the battery cells 21 and the first connecting piece 31, the battery cells 21 of the battery pack 2 can be disassembled, and the battery module has the advantages of easy disassembly and maintenance.

[0048] The utility model also proposes an electrical device, which includes a battery module. The specific structure of the battery module refers to the above embodiment. Since the electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0049] The above-mentioned electrical equipment may include electric bicycles, electric motorcycles, energy storage equipment and household appliances, etc.

[0050] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery module, characterized in that: include: 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 according to claim 1, characterized in that: The battery module further includes a plurality of first insulating plates, wherein the first insulating plates are arranged between adjacent battery cells.

3. The battery module according to claim 1, characterized in that: The connecting part includes a connecting column and a nut; the first connecting piece 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 piece away from the battery cells.

4. The battery module according to claim 1, characterized in that: The battery module further 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 respectively. The collection component is used to obtain performance parameters of each of the battery cells.

5. The battery module according to claim 4, characterized in that: The acquisition component is electrically connected to the first connecting piece and the battery cell respectively; the battery module also includes an electrical connecting wire, one end of which is electrically connected to the circuit board, and the other end of the electrical connecting wire 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 connecting wire.

6. The battery module according to any one of claims 1 to 5, characterized in that: The battery module also includes a plurality of battery groups, which are arranged along the length direction of the shell; the plurality of battery groups are electrically connected to each other; and a plurality of battery cells of the battery group are arranged along the width direction of the shell.

7. The battery module according to claim 6, characterized in that: The connection assembly 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 includes 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, which surrounds 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: A battery module comprising the battery module as claimed in any one of claims 1 to 9.

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