Battery module and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery module and a battery pack. The battery module comprises a battery module, an end plate and a binding assembly, the battery module comprises a plurality of battery packs which are stacked along a first direction, and each battery pack comprises at least two battery cell monomers which are arranged at intervals along a second direction; end plates are arranged at the two ends of the battery module in the first direction; the binding assembly comprises a fixing belt and an insulating belt, the fixing belt is annularly arranged on the side face of the battery module and outside the end plate, and the insulating belt is at least arranged on the portion, opposite to the battery module, of the fixing belt. By arranging the binding assembly, the arrangement of side plates in a traditional battery module is omitted, on one hand, the thickness distance of a plurality of side plates can be reduced when the battery modules are arranged, so that the width is smaller when the battery modules with the same number are packed, and the space utilization rate and the energy density of the whole pack are improved; and on the other hand, the processing cost of the binding assembly is low, and the expansion force of the battery module can be effectively resisted.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery module and a battery pack. Background Art

[0002] With the rapid development of the new energy industry, electrochemical energy storage products are becoming increasingly mature in the market. Among them, power battery packs are the research and development core of electrochemical energy storage products. Each battery pack is composed of multiple battery modules, and each battery module is composed of multiple battery cells connected in series and parallel.

[0003] When battery modules in related technologies are grouped, the battery cells are usually stacked along their thickness direction to form a battery module, end plates are attached to both ends of the battery module, side plates are attached to the sides of the battery module, and then the adjacent end plates and side plates are welded to form a whole. When the battery module is assembled into a battery pack, the space utilization rate is low, the energy density of the whole pack is low, and the processing cost is high.

[0004] Therefore, there is an urgent need to provide a battery module to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a battery module and a battery pack, which have a simple structure and can improve the space utilization and energy density of the battery pack, while reducing the processing cost.

[0006] As conceived above, the technical solution adopted by the utility model is:

[0007] A battery module, comprising:

[0008] A battery module, comprising a plurality of battery packs stacked along a first direction, each of the battery packs comprising at least two battery cells spaced apart along a second direction;

[0009] End plates, both ends of the battery module are provided with the end plates along the first direction;

[0010] A binding assembly, comprising a fixing belt and an insulating belt, wherein the fixing belt is looped around the side of the battery module and outside the end plate, and the insulating belt is provided on at least a portion of the fixing belt that is arranged opposite to the battery module;

[0011] The first direction and the second direction are perpendicular to each other.

[0012] As a preferred solution of the battery module provided by the utility model, the insulating belt is ring-shaped, and the insulating belt is wrapped around the fixing belt.

[0013] As a preferred solution of the battery module provided by the utility model, avoidance grooves for avoiding the insulating belt are provided on both sides of the end plate.

[0014] As a preferred solution of the battery module provided by the utility model, the groove depth of the avoidance groove is greater than or equal to the sum of the thickness of the fixing belt and the thickness of the two insulating belts; and / or the groove width of the avoidance groove is greater than or equal to the sum of the width of the fixing belt and the thickness of the two insulating belts.

[0015] As a preferred solution of the battery module provided by the utility model, a limiting groove for accommodating the fixing belt is provided on the side of the end plate away from the battery module.

[0016] As a preferred solution of the battery module provided by the utility model, the groove depth of the limiting groove is greater than or equal to the thickness of the fixing belt; and / or the groove width of the limiting groove is greater than or equal to the width of the fixing belt.

[0017] As a preferred solution of the battery module provided by the utility model, there are multiple binding assemblies, and the multiple binding assemblies are arranged at intervals along the height direction of the battery cell monomer.

[0018] As a preferred solution of the battery module provided by the utility model, the battery module also includes a clamping member, which is arranged corresponding to the interval position between two adjacent battery cells arranged along the second direction, and the two ends of the clamping member are respectively connected to the two end plates, and can be clamped on the partial top surface of two adjacent battery cells in all the battery packs stacked along the first direction.

[0019] As a preferred solution of the battery module provided by the utility model, a first insulating member is provided between the battery pack located at the end and the end plate at the corresponding side.

[0020] As a preferred solution of the battery module provided by the utility model, a second insulating member is provided between two adjacent battery cells in each battery pack.

[0021] As a preferred solution of the battery module provided by the utility model, at least one buffer structure is provided between two adjacent battery cells along the first direction.

[0022] The utility model also provides a battery pack, comprising a shell and the above-mentioned battery module, wherein the battery module is arranged in the shell.

[0023] The beneficial effects of the utility model are:

[0024] The utility model provides a battery module, which fixes the battery module and the end plates at both ends of the battery module by a binding assembly, omitting the setting of the side plates in the traditional battery module. On the one hand, compared with the traditional battery module, when the battery module is assembled into a battery pack, the thickness distance of multiple side plates can be reduced when they are arranged, so that the width of the battery modules with the same number of modules is smaller, thereby improving the space utilization and the energy density of the whole pack; on the other hand, compared with the side plates in the traditional battery module, the binding assembly has a lower processing cost, a simple structure, is easy to assemble, and can effectively resist the expansion force of the battery module. In addition, an insulating belt is provided on the fixing belt, which can play a role of insulation between the fixing belt and the battery module to ensure the safety of the battery module when in use.

[0025] The utility model provides a battery pack. By applying the above-mentioned battery module, the energy density of the entire battery pack can be improved, and the assembly efficiency of the battery pack can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a battery module provided by an embodiment of the utility model;

[0027] Figure 2 It is a partial exploded schematic diagram of a battery module provided by an embodiment of the utility model;

[0028] Figure 3 yes Figure 2 A local enlarged view at point A;

[0029] Figure 4 It is a structural schematic diagram of the end plate provided by an embodiment of the utility model;

[0030] Figure 5 yes Figure 1 A partial enlarged view at point B.

[0031] In the figure:

[0032] 100, battery module; 110, battery pack; 111, battery cell;

[0033] 200, end plate; 201, avoidance groove; 202, limit groove;

[0034] 300, tying assembly; 310, fixing tape; 320, insulating tape;

[0035] 400, clamping piece;

[0036] 500, a first insulating member;

[0037] 600, second insulating member;

[0038] 700. Buffer structure. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0043] Figure 1 A schematic structural diagram of a battery module provided in this embodiment is shown. Figure 2 FIG. 2 shows a partial exploded schematic diagram of a battery module provided in this embodiment. Figure 1-Figure 2As shown, this embodiment provides a battery module, which includes a battery module 100, an end plate 200 and a binding assembly 300, wherein the battery module 100 includes a plurality of battery groups 110 stacked along a first direction, and each battery group 110 includes at least two battery cells 111 arranged at intervals along a second direction; along the first direction, end plates 200 are arranged at both ends of the battery module 100; the binding assembly 300 includes a fixing belt 310 and an insulating belt 320, the fixing belt 310 is looped around the side of the battery module 100 and the outside of the end plate 200, and the insulating belt 320 is provided on at least the portion of the fixing belt 310 opposite to the battery module 100.

[0044] The battery module provided in this embodiment uses the binding assembly 300 to fix the battery module 100 and the end plates 200 located at both ends of the battery module 100, and omits the side plates in the traditional battery module. On the one hand, compared with the traditional battery module, when the battery module is assembled into a battery pack, the thickness distance of multiple side plates can be reduced when they are arranged, so that the width of the battery modules with the same number of modules is smaller, thereby improving the space utilization and the energy density of the whole pack; on the other hand, compared with the side plates in the traditional battery module, the binding assembly 300 has a lower processing cost, a simple structure, is easy to assemble, and can effectively resist the expansion force of the battery module 100. In addition, the insulating belt 320 is provided on the fixing belt 310, which can play the role of insulation between the fixing belt 310 and the battery module 100, so as to ensure the safety of the battery module when in use.

[0045] It should be noted that, in this embodiment, the first direction refers to the thickness direction of the battery cell 111 , the second direction refers to the length direction of the battery cell 111 , and the first direction, the second direction and the height direction of the battery cell 111 are perpendicular to each other.

[0046] It should be explained that a plurality of battery packs 110 are stacked in sequence along a first direction to form a battery module 100, and an end plate 200 is provided on the side of the two battery packs 110 at the end of the battery module 100 away from the other battery packs 110. For the convenience of description, the surface of the battery module 100 in contact with the end plate 200 is defined as the first surface, the surface of the battery module 100 not in contact with the end plate 200 is defined as the second surface, and the surface of the end plate 200 facing away from the battery module 100 is defined as the third surface. The binding assembly 300 is arranged around the battery module 100 and the end plate 200, which means that the binding assembly 300 is in contact with the third surface of the end plate 200 and the second surface of the battery module 100, respectively, so as to achieve stable fixation of the battery module 100 and the end plate 200 by the binding assembly 300.

[0047] In this embodiment, each battery pack 110 includes two battery cells 111 spaced apart along the second direction. Of course, in other embodiments, the number of battery cells 111 in each battery pack 110 can also be three, four, five or any number above five. Designers can adjust the number of battery cells 111 in each battery pack 110 according to actual needs to achieve optimal space utilization and energy density of the entire pack, while ensuring the reliability and safety of the battery pack as a whole.

[0048] Optionally, the fixing belt 310 is a steel belt made of SUS201 or other high-strength steel. The fixing belt 310 is the main component that restrains the battery module 100 and the end plate 200 to form a pre-tightening force. The steel belt has good tensile properties and can provide sufficient strength after the battery module is assembled to ensure that the battery module has a good fixing effect. The insulating belt 320 set on the side of the fixing belt 310 facing the battery module 100 can prevent the friction between the fixing belt 310 and the battery cell 111 from causing insulation failure.

[0049] like Figure 2 As shown, a first insulating member 500 is provided between the battery pack 110 at the end and the end plate 200 at the corresponding side, so as to provide insulation between the battery pack 110 and the end plate 200 at the corresponding side, and prevent the short circuit caused by the contact between the battery cell 111 and the end plate 200, thereby improving the safety of the entire battery module. In this embodiment, the first insulating member 500 can be fixed to the battery pack 110 and the end plate 200 by means of structural adhesive bonding, which is simple to assemble and has a good fixing effect.

[0050] Optionally, a second insulating member 600 is provided between two adjacent battery cells 111 in each battery pack 110 to insulate the two adjacent battery cells 111 and prevent short circuits caused by contact between the two adjacent battery cells 111, thereby improving the safety of the entire battery module. In this embodiment, the second insulating member 600 can be fixed to the battery cell 111 by means of structural adhesive bonding, which is simple to assemble and has a good fixing effect. When assembling the battery module, two battery cells 111 are first bonded and spliced ​​along their length direction through the second insulating member 600 to form a battery pack 110, and then multiple battery packs 110 are stacked along the first direction. This assembly method can prevent the CCS and the poles of the battery cell 111 from being misaligned during welding to ensure the quality of the finished battery module.

[0051] It should be noted that this embodiment does not limit the specific structure and material of the first insulating member 500 and the second insulating member 600. Insulating members in the prior art that can serve as an insulator between the battery cell 111 and the end plate 200 or between two adjacent battery cells 111 are within the protection scope of this embodiment.

[0052] like Figure 2 As shown, along the first direction, at least one buffer structure 700 is provided between two adjacent battery cells 111. The buffer structure 700 can absorb the installation tolerance between the battery pack 110 and the end plate 200, so as to achieve accurate installation of the battery module; in addition, during the use of the battery module, the buffer structure 700 can also absorb the expansion force generated by the deformation of the battery cell 111, so as to avoid generating large stress on the binding assembly 300.

[0053] In this embodiment, the buffer structure 700 can be set to a strip shape, and at least two buffer structures 700 are arranged in a spaced relationship along the height direction of the battery cell 111 between each two adjacent battery cells 111 along the first direction to further increase the buffering effect. Optionally, the buffer structure 700 can be fixed to the battery cell 111 by adhesive bonding on the surface, which is simple to assemble and has a good fixing effect. Of course, in other embodiments, the designer can also adjust the shape of the buffer structure 700 according to actual needs to achieve the best buffering effect.

[0054] Optionally, the buffer structure 700 is made of foam material, which has a better buffering effect, is easy to obtain, and has a low manufacturing cost.

[0055] Optionally, there are multiple tying assemblies 300, which are spaced apart along the height direction of the battery cell 111 to effectively fix the battery module 100 and the two end plates 200, and prevent the battery cell 111 from being displaced or damaged under the action of vibration, impact, etc., thereby ensuring the overall rigidity and stability of the entire battery module. In this embodiment, there are two tying assemblies 300, so as to reduce the number of tying assemblies 300 while ensuring the stability of the entire battery module, thereby reducing material costs.

[0056] Figure 3 Shows Figure 2 A partial enlarged view at point A. Figure 3 Combined with Figure 2 As shown, the insulating tape 320 is annular, and the insulating tape 320 is wrapped around the fixing tape 310, with a simple structure and convenient assembly. Of course, in other embodiments, the insulating tape 320 can also be a sheet structure, and the sheet insulating tape 320 is attached to the side of the fixing tape 310 facing the battery cell 111, which can also achieve the above effect.

[0057] In this embodiment, the insulating tape 320 is only provided on the portion of the fixing tape 310 facing the battery cell 111, and the insulating tape 320 is not provided on the portion facing the end plate 200. This design can reduce the material used for the insulating tape 320 and reduce the material cost. On the other hand, it can reduce the size of the battery module in the first direction to a certain extent, further improving the space utilization rate and the energy density of the whole package when it is packaged. Of course, in other embodiments, the insulating tape 320 can also be provided outside the entire fixing tape 310, which can also achieve the above effect.

[0058] Figure 4 A schematic structural diagram of the end plate 200 provided in this embodiment is shown. Figure 5 Shows Figure 1 A partial enlarged view at B. Figure 4-Figure 5 Combined with Figure 2 As shown, both sides of the end plate 200 are provided with avoidance grooves 201 for avoiding the insulating strip 320 to avoid interference between the insulating strip 320 and the end plate 200. It should be explained that the avoidance groove 201 is provided on the side of the end plate 200 parallel to the second side of the battery module 100.

[0059] Optionally, the depth of the avoidance groove 201 is greater than or equal to the sum of the thickness of the fixing belt 310 and the thickness of the two insulating belts 320, so as to prevent the side of the insulating belt 320 away from the battery module 100 from protruding from the side of the end plate 200, resulting in an excessively large interval between two adjacent battery modules after the battery modules are packaged. Optionally, the width of the avoidance groove 201 is greater than or equal to the sum of the width of the fixing belt 310 and the thickness of the two insulating belts 320, so as to facilitate the assembly of the binding assembly 300 with the battery module 100 and the end plate 200.

[0060] In this embodiment, the width of the fixing belt 310 is 19 mm, the thickness is 1 mm, and the thickness of the annular insulating belt 320 is 1 mm. Therefore, the thickness of the portion of the fixing belt 310 covered with the insulating belt 320 is the sum of the thickness of the fixing belt 310 and the thickness of the two insulating belts 320, that is, 3 mm; the width of the portion of the fixing belt 310 covered with the insulating belt 320 is the sum of the width of the fixing belt 310 and the thickness of the two insulating belts 320, that is, 21 mm. Accordingly, the groove depth of the avoidance groove 201 provided on the end plate 200 is 3 mm, and the groove width is 21 mm. This design can ensure that the side of the binding assembly 300 away from the battery module 100 is flush with the side of the end plate 200, and can prevent the binding assembly 300 from moving in the avoidance groove 201 along the height direction of the battery cell 111. Of course, in other embodiments, the width of the avoidance groove 201 provided on the end plate 200 may also be 21.1 mm, 21.2 mm, 21.3 mm, 21.4 mm, 21.5 mm, etc., and the depth may be 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, etc. Of course, this embodiment does not limit the specific values ​​of the groove depth and groove width of the avoidance groove 201, and the designer may adjust the specific values ​​of the groove depth and groove width of the avoidance groove 201 according to the size of the binding assembly 300 corresponding to different types of battery modules 100.

[0061] It should be noted that the width of the avoidance groove 201 refers to the size of the avoidance groove 201 in the height direction of the battery cell 111; the depth of the avoidance groove 201 refers to the size of the avoidance groove 201 in the second direction. In addition, in this embodiment, the length of the avoidance groove 201 (the size of the avoidance groove 201 in the first direction) is 0.6 mm, so as to provide sufficient space for the adjustment of the binding assembly 300 along the first direction during installation. Of course, in other embodiments, the length of the avoidance groove 201 can also be 0.3 mm, 0.4 mm, 0.5 mm, 0.7 mm, 0.8 mm, etc. This embodiment does not limit the specific value of the length of the avoidance groove 201. Designers can adjust the specific value of the length of the avoidance groove 201 according to the size of the binding assembly 300 corresponding to different types of battery modules 100 and the thickness of the end plate 200.

[0062] like Figure 4-Figure 5As shown, the side of the end plate 200 facing away from the battery module 100 is provided with a limiting groove 202 for accommodating the fixing belt 310. The setting of the limiting groove 202 can limit the fixing belt 310 to prevent the binding assembly 300 from shifting in the height direction of the battery cell 111, and avoid the battery module from loosening during vibration and circulation, thereby ensuring the reliability of the binding assembly 300 in fixing the end plate 200 and the battery module 100, and the fixing effect is good. Optionally, two limiting grooves 202 are provided on each end plate 200 corresponding to each fixing belt 310, and the two limiting grooves 202 are respectively located at the two ends of the end plate 200 along the second direction to further improve its limiting effect on the fixing belt 310.

[0063] Optionally, the depth of the limiting groove 202 is greater than or equal to the thickness of the fixing belt 310 ; the width of the limiting groove 202 is greater than or equal to the width of the fixing belt 310 , so as to facilitate the assembly of the binding assembly 300 with the battery module 100 and the end plate 200 .

[0064] In this embodiment, the width of the fixing belt 310 is 19 mm and the thickness is 1 mm. Accordingly, the groove depth of the limiting groove 202 provided on the end plate 200 is 1 mm and the groove width is 20.5 mm. This design can ensure that the side of the fixing belt 310 away from the battery module 100 is flush with the side of the end plate 200, and can facilitate the assembly and fixation between the binding assembly 300 and the end plate 200 and the battery module 100. Of course, in other embodiments, the groove width of the limiting groove 202 provided on the end plate 200 can also be 20.6 mm, 20.8 mm, 20.9 mm, 21.0 mm, etc., and the groove depth is 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc. Of course, this embodiment does not limit the specific values ​​of the groove depth and groove width of the limiting groove 202. Designers can adjust the specific values ​​of the groove depth and groove width of the limiting groove 202 according to the size of the fixing belt 310 corresponding to different types of battery modules 100. It should be noted that the width of the limiting groove 202 refers to the dimension of the limiting groove 202 in the height direction of the battery cell 111 ; the depth of the limiting groove 202 refers to the dimension of the limiting groove 202 in the second direction.

[0065] Continue as Figure 2 As shown, the battery module further includes a pressing member 400, which is arranged corresponding to the interval between two adjacent battery cells 111 arranged along the second direction, and the two ends of the pressing member 400 are respectively connected to the two end plates 200, and can be pressed against the partial top surfaces of two adjacent battery cells 111 in all battery groups 110 stacked along the first direction. By providing the pressing member 400, the rigidity of the battery module can be improved, and the displacement of the battery module 100 in the height direction of the battery cell 111 when expansion occurs can be effectively resisted.

[0066] Optionally, both ends of the pressing member 400 are fixed to the end plate 200 on the corresponding side by gluing and fasteners to ensure the fixing effect between the two.

[0067] This embodiment also provides a battery pack, which includes a housing and the above-mentioned battery module, wherein the battery module is arranged in the housing. By using the above-mentioned battery module, the energy density of the entire battery pack can be increased, and the assembly efficiency of the battery pack can be improved.

[0068] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A battery module, characterized in that: include: A battery module (100) comprises a plurality of battery packs (110) stacked along a first direction, each of the battery packs (110) comprising at least two battery cell monomers (111) spaced apart along a second direction; end plates (200), both ends of the battery module (100) being provided with the end plates (200) along the first direction; A binding assembly (300) comprising a fixing belt (310) and an insulating belt (320), wherein the fixing belt (310) is looped around the side surface of the battery module (100) and outside the end plate (200), and the insulating belt (320) is provided on at least a portion of the fixing belt (310) that is arranged opposite to the battery module (100); The first direction and the second direction are perpendicular to each other.

2. The battery module according to claim 1, characterized in that: The insulating belt (320) is ring-shaped, and the insulating belt (320) is wrapped around the fixing belt (310).

3. The battery module according to claim 2, characterized in that: Both sides of the end plate (200) are provided with avoidance grooves (201) for avoiding the insulating belt (320).

4. The battery module according to claim 3, characterized in that: The groove depth of the avoidance groove (201) is greater than or equal to the sum of the thickness of the fixing belt (310) and the thickness of the two insulating belts (320); and / or the groove width of the avoidance groove (201) is greater than or equal to the sum of the width of the fixing belt (310) and the thickness of the two insulating belts (320).

5. The battery module according to claim 2, characterized in that: A limiting groove (202) for accommodating the fixing belt (310) is provided on the side of the end plate (200) facing away from the battery module (100).

6. The battery module according to claim 5, characterized in that: The groove depth of the limiting groove (202) is greater than or equal to the thickness of the fixing belt (310); and / or the groove width of the limiting groove (202) is greater than or equal to the width of the fixing belt (310).

7. The battery module according to any one of claims 1 to 6, characterized in that: There are a plurality of the binding assemblies (300), and the plurality of the binding assemblies (300) are arranged at intervals along the height direction of the battery cell (111).

8. The battery module according to any one of claims 1 to 6, characterized in that: The battery module further comprises a pressing member (400), the pressing member (400) being arranged corresponding to the spacing position between two adjacent battery cells (111) arranged along the second direction, the two ends of the pressing member (400) being respectively connected to the two end plates (200), and being capable of pressing against a portion of the top surface of two adjacent battery cells (111) in all the battery groups (110) stacked along the first direction.

9. The battery module according to any one of claims 1 to 6, characterized in that: A first insulating member (500) is provided between the battery pack (110) located at the end and the end plate (200) at the corresponding side; and / or A second insulating member (600) is provided between two adjacent battery cells (111) in each battery pack (110); and / or Along the first direction, at least one buffer structure (700) is provided between two adjacent battery cell units (111).

10. A battery pack, characterized in that: The invention comprises a housing and a battery module as claimed in any one of claims 1 to 9, wherein the battery module is arranged in the housing.

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