CN213278184U

CN213278184U - Module splint, cooling system and battery module of battery module

Info

Publication number: CN213278184U
Application number: CN202022182088.7U
Authority: CN
Inventors: 边立富; 魏向辉; 盛杰
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2021-05-25
Anticipated expiration: 2030-09-28

Abstract

The utility model discloses a cooling system and battery module of module splint, battery module, module splint are suitable for to install in the battery module and are used for linking to each other with the laminating of electricity core, module splint include: the clamp plate comprises a clamp plate body, wherein the clamp plate body is connected with a vent pipe which is used for being connected with a cooling air source; the buffer layer is arranged on the side face of the clamping plate body and is superposed with the clamping plate body, the buffer layer is suitable for being attached to the battery cell, the buffer layer is provided with a first outflow hole, the first outflow hole is communicated with the vent pipe, and the first outflow hole is opened towards the battery cell; and the temperature detection piece is used for detecting the temperature of the battery cell. The utility model discloses module splint, when detecting electric core high temperature, cool off through breather pipe input air conditioning, refrigerated pertinence is strong, and cooling efficiency is high, and it is lower to carry out refrigerated energy consumption alone to thermal runaway electricity core, and the cooling cost is low.

Description

Module splint, cooling system and battery module of battery module

Technical Field

The utility model belongs to the technical field of the battery manufacturing technique and specifically relates to a module splint, have the cooling system of the battery module of this module splint and have the battery module of the cooling system of this battery module.

Background

In the existing market, the number of electric automobile firing events is relatively large, the importance of the safety of the battery pack is reflected, and people do not need to worry about that the battery pack can fire if the module has a self cooling function. The battery module among the prior art lacks the quick cooling function of initiative and absorbs the expanded function of electric core, if the battery module takes place the thermal runaway, can only rely on the water cooling system of whole battery package to solve, there are several main problems about the water cooling system of battery package: the pertinence is poor, speed is slow, power consumption is big, when lacking the function of absorption electricity core inflation, then leads to the unsatisfied module size of electric core easily, and the battery module destroys easily, has the space of improvement.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the utility model is to provide a module splint, can carry out the cooling processing of pertinence when electric core generates heat to it diminishes to be compressed when electric core inflation, satisfies module size of a dimension all the time.

According to the utility model discloses module splint, module splint are suitable for to install in the battery module and are used for linking to each other with the laminating of electricity core, module splint include: the clamp plate comprises a clamp plate body, wherein the clamp plate body is connected with a vent pipe which is used for being connected with a cooling air source; the buffer layer is arranged on the side face of the clamping plate body and is superposed with the clamping plate body, the buffer layer is suitable for being attached to the battery cell, the buffer layer is provided with a first outflow hole, the first outflow hole is communicated with the vent pipe, and the first outflow hole is opened towards the battery cell; and the temperature detection piece is used for detecting the temperature of the battery cell.

According to the utility model discloses module splint, when detecting electric core high temperature, cool off through breather pipe input air conditioning, refrigerated pertinence is strong, cooling efficiency is high, and it is lower to carry out refrigerated energy consumption alone to thermal runaway electricity core, the cooling cost is low, the buffer layer is extruded and diminishes when the electricity core generates heat and expands simultaneously, with the deflection that can absorb electric core, thereby make the whole size that remains stable all the time of module, satisfy the designing requirement of module size, and then avoid the part extrusion to damage.

According to the utility model discloses module splint, the splint body is equipped with second outflow hole, the one end in second outflow hole with the breather pipe intercommunication, just the other end in second outflow hole with first outflow hole intercommunication.

According to the utility model discloses the module splint, first outflow hole with second outflow hole is a plurality ofly, and is a plurality of first outflow hole is with a plurality of second outflow hole is just to setting up one by one, and is a plurality of second outflow hole all with the breather pipe intercommunication.

According to the utility model discloses module splint, first play discharge orifice is multiunit and multiunit first play discharge orifice is followed the spaced apart setting of width direction of buffer layer, every group first play discharge orifice is a plurality of and every group first play discharge orifice is followed the spaced apart setting of length direction of buffer layer.

According to the utility model discloses module splint, the multiunit arbitrary two sets of in the first outflow hole's quantity is the same, and the multiunit arbitrary adjacent two sets of in the first outflow hole a plurality of in the first outflow hole is followed the width direction one-to-one of buffer layer is just right.

According to the utility model discloses module splint, the temperature detects the piece and includes: the battery cell comprises a signal wire and a sensor probe, wherein the sensor probe is arranged in the buffer layer and faces towards the battery cell to be exposed, the signal wire is electrically connected with the sensor probe, and the signal wire is electrically connected with the control module.

According to the utility model discloses module splint, the regional department of being close to the center of buffer layer is equipped with the mounting groove, just the buffer layer or the splint body be equipped with the wire casing is crossed to the mounting groove intercommunication, sensor probe install in the mounting groove, just signal conductor arrange in cross the wire casing.

According to the utility model discloses module splint, module splint be suitable for install in adjacent two of module casing between the electric core, the buffer layer is two and two the buffer layer is located respectively the both sides of splint body, and two the buffer layer respectively with adjacent two the side laminating of electric core.

The utility model also provides a cooling system of battery module.

According to the utility model discloses cooling system of battery module, including cooling air supply, control module and any kind of above-mentioned embodiment the module splint, cooling air supply with the breather pipe intercommunication, temperature detect spare with the control module electricity is connected, just cooling air supply be equipped with be used for with the control switch that the control module electricity is connected.

The utility model also provides a battery module.

According to the utility model discloses battery module is provided with any one kind of above-mentioned embodiment the cooling system of battery module.

The advantages of the battery module, the cooling system of the battery module and the module clamping plate are the same compared with the prior art, and are not described again.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a module clamp plate according to an embodiment of the present invention.

Reference numerals:

the number of the module clamping plates 100 is,

the splint body 1, the vent pipe 11, the second outflow hole 12,

the buffer layer 2, the first outflow hole 21, the temperature detecting piece 3, the signal lead 31 and the sensor probe 32.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

A module clamp 100 according to an embodiment of the present invention is described below with reference to fig. 1.

As shown in fig. 1, the module clamping plate 100 according to the embodiment of the present invention includes: splint body 1, buffer layer 2 and temperature-detecting piece 3.

What need explain is, module splint 100 is suitable for to install in the battery module and is used for linking to each other with the laminating of electric core, if there are a plurality of electric cores in the battery module, module splint 100 can set up in the centre of two electric cores, when satisfying the cooling demand, reduce cost also can set up module splint 100 at the attached module splint 100 that sets up of surface of the electric core in the outside when setting up module splint 100 between two adjacent electric cores, and the mounting means is comparatively nimble.

Splint body 1 structure is the cuboid form, and splint body 1 is connected with breather pipe 11, and breather pipe 11 is used for linking to each other with cooling gas source, and splint body 1 still is equipped with the cavity runner that is used for when electric core generates heat to be used for the air conditioning circulation, and buffer layer 2 is equipped with first outflow hole 21, and first outflow hole 21 passes through the cavity runner intercommunication with breather pipe 11, and first outflow hole 21 opens towards electric core and sets up. When electric core generates heat, cooling gas flows into splint body 1's cavity runner from breather pipe 11 in to through whole splint body 1 of cavity runner flow through, and enter into buffer layer 2's first outflow hole 21 in, follow first outflow hole 21 at last and locate the flow direction electric core, and then dispel the heat to electric core, and cool off through air conditioning and compare in the water-cooling among the prior art, flow efficiency is higher, has accelerated the radiating efficiency. Wherein, the buffer layer 2 can be made of foam material, so that the buffer layer has contractibility.

That is, the cooling gas flows in from the vent pipe 11 and blows off to the battery cell through the first outflow hole 21, and the cooling gas directly acts on the battery cell, so that the heat dissipation speed is increased. It should be noted that the cooling gas may be liquid nitrogen or a mixture of gases to ensure that the cell or other structures are not damaged.

Wherein, buffer layer 2 structure be with the cuboid of splint body 1 equal side area, buffer layer 2 install in the side of splint body 1 and with splint body 1 superpose, buffer layer 2 be suitable for with the laminating of electric core, after the installation is accomplished, can guarantee that electric core can not take place to remove. It should be noted that the foam can be replaced by other compressible materials such as silicon rubber, namely, the buffer layer 2 can be compressed to reduce the size, so that when the battery core is out of thermal runaway, the buffer layer 2 can reserve more deformation spaces for the battery core to be heated and expanded, and the overall size requirement of the battery module is met.

Temperature detection piece 3 is located on buffer layer 2 to extend the middle part of buffer layer 2 and expose towards electric core, temperature detection piece 3 is used for detecting the temperature of electric core, when electric core heating expansion, temperature detection piece 3 detects out the temperature and reaches the settlement temperature value, control module is according to the temperature that temperature detection piece 3 detected and the position of temperature detection piece 3 self, the position of the electric core that generates heat is judged, control cooling air supply fills cooling gas in to corresponding breather pipe 11, reach the fastest cooling rate, and reduce power loss. From this, need not all cool off electric core, can realize the cooling of pertinence, cool off through air conditioning, cooling efficiency is high, and only carries out electric control to the cooling air supply that thermal runaway's electric core corresponds breather pipe 11 intercommunication, reduces power consumption, reduces the energy consumption, reduces the cooling cost.

Through the above setting, under the condition that runs into electric core out of control and generate heat, temperature detect piece 3 detects that there is the position of the electric core that generates heat in the electric core of thermal runaway simultaneous determination, control module control cooling gas pours into cooling gas into to the breather pipe 11 that corresponds, cooling gas flows through first outflow hole 21 and directly flows to electric core, make electric core cool off fast, extrusion buffer layer 2 behind the electric core inflation, buffer layer 2 reduces, all the other electric core positions remain unchanged, whole module is not influenced, satisfy the designing requirement of module size.

According to the utility model discloses module splint 100, when detecting electric core high temperature, cool off through 11 input air conditioning of breather pipe, refrigerated pertinence is strong, cooling efficiency is high, and it is lower to carry out refrigerated energy consumption alone to thermal runaway electricity core, the cooling cost is low, buffer layer 2 is squeezed and diminishes when the electricity core generates heat and expands simultaneously, with the deflection that can absorb electric core, thereby make the whole size that remains stable all the time of module, satisfy the designing requirement of module size, and then avoid the part extrusion to damage.

In some embodiments, the splint body 1 is provided with a second outflow hole 12, one end of the second outflow hole 12 communicates with the vent tube 11, and the other end of the second outflow hole 12 communicates with the first outflow hole 21, i.e., the second outflow hole 12 is formed as a hollow flow passage of the splint body 1. That is to say, when the temperature detection piece 3 detects that the electric core temperature is abnormal, the control module determines the position of the electric core that generates heat, the control module controls the cooling gas to flush the cooling gas into the corresponding vent pipe 11, the cooling gas enters the splint body 1 from the vent pipe 11, the cooling gas flows through the second outflow hole 12 to enter the first outflow hole 21, and directly flows to the electric core from the first outflow hole 21, thereby cooling the thermal runaway electric core is realized.

In some embodiments, the first outlet holes 21 and the second outlet holes 12 are both multiple, the multiple first outlet holes 21 and the multiple second outlet holes 12 are arranged in a one-to-one opposite manner, and the multiple second outlet holes 12 are all communicated with the vent pipe 11, so that it is ensured that the cooling gas can smoothly enter the first outlet holes 21 from the second outlet holes 12, and the thermal runaway cell is cooled.

Wherein, a plurality of second play discharge orifice 12 spaced apart arrange in splint body 1, like a plurality of second play discharge orifice 12 evenly distributed in splint body 1's both sides to make same module splint 100 can cool off two adjacent electric cores simultaneously. And can set up breather pipe 11 to stagger with a plurality of outflow holes to make the air current that lets in splint body 1 can be at the effect of splint body 1 inner wall down towards different outflow holes diffusion, avoid the air current to concentrate from the local position department and flow, ensure that cooling gas can distribute a plurality of second outflow holes 12 as far as evenly as possible, guarantee that the radiating effect of each position department of thermal runaway electric core is comparatively balanced, in order to improve the holistic radiating efficiency of electric core.

In some embodiments, the first outflow holes 21 are provided in a plurality of groups, the plurality of groups of first outflow holes 21 are spaced apart from each other in the width direction of the buffer layer 2, each group of first outflow holes 21 is provided in a plurality, and the plurality of first outflow holes 21 of each group are spaced apart from each other in the length direction of the buffer layer 2. That is to say, through setting up first outflow hole 21 multiunit and including a plurality of in every group, can make first outflow hole 21 can cool off the gas injection to a plurality of positions department of electric core on the width direction, can cool off the gas injection again in a plurality of positions department on the length direction of electric core simultaneously again to make the cooling airflow spout each position of electric core to the buffer layer 2 equilibrium as far as possible, thereby make the radiating effect of each position department of thermal runaway electric core comparatively balanced, improve heat dispersion.

In some embodiments, the number of the first outlet holes 21 in any two of the first outlet holes 21 is the same, and the first outlet holes 21 in any two adjacent first outlet holes 21 in the first outlet holes 21 are directly opposite to each other in the width direction of the buffer layer 2. First outflow hole 21 evenly distributed on buffer layer 2, after cooling gas flowed through second outflow hole 12 from breather pipe 11 and got into first outflow hole 21, can blow on electric core uniformly in a plurality of positions department, guaranteed heat radiating area's extensively, improved the radiating efficiency.

As shown in fig. 1, the first outflow holes 21 include six groups arranged at intervals in the width direction of the buffer layer 2, and each group of the first outflow holes 21 includes four groups arranged at intervals in the length direction of the buffer layer 2, and the intervals between any two adjacent first outflow holes 21 are the same, so that the cooling airflow can be injected more uniformly toward the battery cell. Wherein the arrangement of the second outlet openings 12 can be configured to correspond to the arrangement of the first outlet openings 21.

In some embodiments, the temperature detection member 3 includes: signal conductors 31 and sensor probes 32. The sensor probe 32 is installed in the buffer layer 2, the sensor probe 32 is exposed towards the battery core, the signal wire 31 is electrically connected with the sensor probe 32, and the signal wire 31 extends out of the buffer layer 2 to be electrically connected with the control module.

That is to say, there is not structural obstacle between sensor probe 32 and the direct contact of electricity core or sensor probe 32 and the electricity core, so that when the electricity core begins to generate heat the inflation after, sensor probe 32 can detect the electricity core thermal runaway more high-efficiently, more accurately, and the testing result spreads into control module through signal wire 31, and when the detection temperature reaches the predetermined value that establishes in control module, control module judges the position of the electricity core that generates heat according to detecting out the position that exceeds temperature detection piece 3 of setting for temperature, controls the cooling gas source and fills into cooling gas in corresponding breather pipe 11, reaches the fastest cooling speed, and pertinence is stronger.

In some embodiments, a mounting groove is formed near the central region of the buffer layer 2, and the buffer layer 2 or the splint body 1 is provided with a wire passing groove communicated with the mounting groove. When the wire passing groove is arranged in the buffer layer 2, the wire passing groove and the mounting groove are open towards the battery core, the wire passing groove extends to the edge of the buffer layer 2, the sensor probe 32 is mounted in the mounting groove, and the signal wire 31 is arranged in the wire passing groove; or when the wire passing groove is arranged in the splint body 1, the upper end and the lower end of the wire passing groove are opened, the lower end of the wire passing groove is communicated with the installation groove, the installation groove is opened towards the electric core, the wire passing groove extends to the edge of the splint body 1, the sensor probe 32 is installed in the installation groove, and the signal wire 31 is arranged in the wire passing groove. That is, the signal wires 31 are inserted into the wire passing grooves, so that the signal wires 31 are prevented from being randomly arranged in the battery module, and the signal wires 31 are prevented from interfering with other structural members. And install sensor probe 32 in the mounting groove, can avoid sensor probe 32 to remove in battery module to make sensor probe 32 can not extrude and damage or take place the position and remove, can detect all the time.

As shown in fig. 1, the wire passing groove extends in the up-down direction, and the upper end of the wire passing groove is open, so that the signal wire 31 can penetrate out from the upper end of the wire passing groove, and the lower end of the wire passing groove is communicated with the mounting groove, so that the signal wire 31 can extend into the mounting groove to be electrically connected with the sensor probe 32, thereby realizing the signal transmission between the control module and the sensor.

In some embodiments, the module clamping plate 100 is suitable for being installed between two adjacent electric cores of the module housing, the number of the buffer layers 2 is two, the two buffer layers 2 are respectively disposed on two sides of the clamping plate body 1, and the two buffer layers 2 are respectively attached to the side surfaces of the two adjacent electric cores. Be equipped with buffer layer 2 through the both sides at splint body 1 for a module splint 100 can be cooled down for two adjacent electric cores simultaneously, avoids thermal runaway electric core to transmit heat to around, and two electric cores cool off the heat dissipation through same module splint 100 simultaneously, need not set up cooling structure respectively alone, reduce cooling structure's quantity, practice thrift the module space, the cost is reduced.

It should be noted that the bottom of the module clamp plate 100 is provided with a recess adapted to fit in the bottom of the module for securing and stabilizing the module clamp plate 100.

The application also provides a cooling system of the battery module.

According to the utility model discloses cooling system of battery module, module splint 100 including cooling air source, control module and any kind of above-mentioned embodiment. The cooling air source is communicated with the ventilating pipe 11, the temperature detection piece 3 is electrically connected with the control module, and the cooling air source is provided with a control switch which is used for being electrically connected with the control module.

Through the aforesaid setting, under the condition that runs into electric core out of control and generate heat, temperature detect piece 3 detects out heat loss control temperature, and spread into control module with temperature information, control module surpasss the position at the temperature detect piece 3 place of settlement temperature value according to detecting out the actual temperature value, confirm the position of the electric core that generates heat, control module opens the cooling air supply who is used for cooling this electric core that generates heat, and with cooling gas rush into corresponding breather pipe 11, cooling gas flows through first outflow hole 21 and directly flows to electric core, make electric core cool off fast, after temperature detect piece 3 detects out that the temperature reduces under the setting value, control module closes the cooling air supply who opens, accomplish the cooling process. Wherein, extrusion buffer layer 2 behind the electric core inflation, buffer layer 2 dwindles, and all the other electric core positions remain unchanged, and whole module is not influenced, satisfies the design requirement of module size.

The utility model also provides a battery module.

According to the utility model discloses battery module sets up the cooling system of the battery module of above-mentioned arbitrary embodiment. Through the setting, when detecting electric core high temperature, cool off through 11 input air conditioning of breather pipe, refrigerated pertinence is strong, cooling efficiency is high, and it is lower to carry out refrigerated energy consumption alone to thermal runaway electricity core, the cooling cost is low, buffer layer 2 is diminished by the extrusion when the electricity core generates heat and expands simultaneously, with the deflection that can absorb electric core, thereby make the whole size that remains stable all the time of module, satisfy the design requirement of module size, and then avoid the part extrusion to damage.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.

In the description of the present invention, "a plurality" means two or more.

In the description of the present invention, the first feature "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween.

In the description of the invention, the first feature being "on", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. The utility model provides a module splint (100), its characterized in that, module splint (100) are suitable for to install in the battery module and are used for linking to each other with the laminating of electricity core, module splint (100) include:

the clamp plate comprises a clamp plate body (1), wherein the clamp plate body (1) is connected with a vent pipe (11), and the vent pipe (11) is used for being connected with a cooling air source;

the buffer layer (2) is mounted on the side face of the clamping plate body (1) and is overlapped with the clamping plate body (1), the buffer layer (2) is suitable for being attached to the battery cell, the buffer layer (2) is provided with a first outflow hole (21), the first outflow hole (21) is communicated with the vent pipe (11), and the first outflow hole (21) is arranged in an open mode towards the battery cell;

the temperature detection piece (3), the temperature detection piece (3) is used for detecting the temperature of the battery core.

2. The module clamp plate (100) according to claim 1, wherein the clamp plate body (1) is provided with a second outflow hole (12), one end of the second outflow hole (12) communicates with the vent pipe (11), and the other end of the second outflow hole (12) communicates with the first outflow hole (21).

3. The module clamp plate (100) according to claim 2, wherein the first outflow hole (21) and the second outflow hole (12) are both plural, and the plural first outflow holes (21) and the plural second outflow holes (12) are arranged opposite to each other, and the plural second outflow holes (12) are all communicated with the vent pipe (11).

4. The module clamp plate (100) according to claim 1, wherein the first outflow holes (21) are provided in a plurality of groups and the plurality of groups of first outflow holes (21) are spaced apart in a width direction of the buffer layer (2), each group of first outflow holes (21) is provided in a plurality and the plurality of first outflow holes (21) of each group are spaced apart in a length direction of the buffer layer (2).

5. The module clamp plate (100) according to claim 4, characterized in that the number of the first outlet holes (21) of any two of the first outlet holes (21) is the same, and the first outlet holes (21) of any two adjacent sets of the first outlet holes (21) are directly opposite to each other in the width direction of the buffer layer (2).

6. The module clamping plate (100) according to claim 1, wherein the temperature detection member (3) comprises: signal conductor (31) and sensor probe (32), sensor probe (32) install in buffer layer (2), just sensor probe (32) orientation the electric core is exposed, signal conductor (31) with sensor probe (32) electricity is connected, just signal conductor (31) and control module electricity are connected.

7. The module cleat (100) of claim 6, characterised in that the cushioning layer (2) is provided with a mounting groove near the central region, and the cushioning layer (2) or the cleat body (1) is provided with a wire passing groove communicating with the mounting groove, the sensor probe (32) is mounted in the mounting groove, and the signal conductor (31) is arranged in the wire passing groove.

8. The module clamping plate (100) according to claim 1, wherein the module clamping plate (100) is suitable for being installed between two adjacent electric cores of the module shell, the number of the buffer layers (2) is two, the two buffer layers (2) are respectively arranged on two sides of the clamping plate body (1), and the two buffer layers (2) are respectively attached to the side faces of the two adjacent electric cores.

9. A cooling system of a battery module, comprising a cooling air source, a control module and the module clamping plate (100) of any one of claims 1 to 8, wherein the cooling air source is communicated with the vent pipe (11), the temperature detection member (3) is electrically connected with the control module, and the cooling air source is provided with a control switch for electrically connecting with the control module.

10. A battery module characterized by being provided with the cooling system for a battery module according to claim 9.