CN214124001U - Lithium ion battery module - Google Patents
Lithium ion battery module Download PDFInfo
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- CN214124001U CN214124001U CN202022033648.2U CN202022033648U CN214124001U CN 214124001 U CN214124001 U CN 214124001U CN 202022033648 U CN202022033648 U CN 202022033648U CN 214124001 U CN214124001 U CN 214124001U
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- circuit board
- lithium ion
- battery module
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model relates to a lithium ion battery field discloses a lithium ion battery module. It includes: the battery pack comprises a battery pack body and a battery pack body, wherein the battery pack body comprises a plurality of battery monomers which are fixedly arranged together, and an explosion-proof valve is arranged at the end part of each battery monomer where an electrode is positioned and is positioned between the two electrodes; the battery pack comprises an insulating isolation plate main body, wherein the isolation plate main body is also provided with polar column extending holes, each polar column extending hole is over against each electrode, an explosion-proof hole is also arranged between the two rows of polar column extending holes of the isolation plate main body, and each explosion-proof hole is over against each explosion-proof valve on the battery pack body; the circuit board assembly is positioned between the two rows of busbars, and a voltage sampling circuit is arranged on the circuit board assembly and at least passes right above at least one explosion-proof hole on the main body of the isolation plate. By adopting the technical scheme of the embodiment, the application safety of the battery module is improved.
Description
Technical Field
The utility model relates to a lithium ion battery field discloses a lithium ion battery module.
Background
The lithium ion battery has the advantages of high voltage, large specific energy density, long cycle, good rate capability, safety and environmental protection, small self-discharge, no memory effect and the like. Because of their excellent characteristics, lithium ion batteries are widely used in power automobiles, consumer electronics, and energy storage.
The power lithium ion battery is formed by connecting a plurality of battery monomers in series or in parallel or in a combination of series connection and parallel connection, and the power lithium ion battery serves as an integral lithium ion battery module to supply power to the outside. During assembly, fix each battery monomer side by side together, at the free electrode place tip of battery, connect each battery monomer electricity through the busbar and be an integral battery module, and, still be provided with control circuit board at this end plate, and generally but not limited to adopt flexible circuit board, in order to control the charge-discharge of battery module, it has insulating pencil division board to cover at the top of battery module, control circuit board fixes the bottom surface at the pencil division board, and the pencil division board covers the busbar at the top of battery module comprehensively, play and fix pencil and the subassembly of this side and keep apart insulating effect to the circuit part of battery module.
The inventor finds that the prior art has the following defects in the research process of the invention, and due to the characteristic of high energy density of the lithium ion battery, the short circuit of the battery can be caused under the extreme conditions of overcharge, high temperature, extrusion and the like, so that thermal runaway is caused, and safety accidents are caused.
Disclosure of Invention
An object of the embodiment of the utility model is to provide a lithium ion battery module adopts this embodiment technical scheme to be favorable to improving the application security of battery module.
The embodiment of the utility model provides a pair of lithium ion battery module, include:
the battery pack comprises a battery pack body and a battery pack body, wherein the battery pack body comprises a plurality of battery monomers which are fixedly arranged together, the electrode of each battery monomer is positioned at the top of the battery pack body, and an explosion-proof valve is arranged at the end part of each battery monomer where the electrode is positioned and positioned between the two electrodes;
the battery pack comprises an insulating isolation plate main body, wherein a plurality of vertically penetrating pole column extending holes for extending electrodes of each battery monomer are further formed in the isolation plate main body, each pole column extending hole is opposite to each electrode, an explosion-proof hole is further formed between the two rows of pole column extending holes of the isolation plate main body, and each explosion-proof hole is opposite to each explosion-proof valve on the battery pack body;
two bus bars fixed on the top surface of the isolation plate main body, each bus bar comprises at least one conducting strip, each conducting strip covers each pole extending hole, each conducting strip is electrically connected with the electrode between at least two battery monomers,
and the circuit board assembly is fixed on the isolation board main body and positioned between the two rows of busbars, voltage sampling circuits which are respectively and electrically connected with the voltage sampling points preset on the conducting strips are arranged on the circuit board assembly, and each voltage sampling circuit at least passes through the position right above at least one explosion-proof hole in the isolation board main body.
Optionally, a reserved slot is further disposed in a region, facing the circuit board assembly, of the isolation board main body, so as to reserve a vertical space for a temperature sensor located on the circuit board assembly.
Optionally, the circuit board assembly is a flexible circuit board.
Optionally, when the temperature sensor arranged on the circuit board assembly is a patch type temperature sensor,
the temperature sensors are respectively attached to the nickel sheets on the bottom surface of the circuit board assembly, and the end parts of the nickel sheets extending out of the circuit board assembly are respectively and closely fixed to the top surfaces of the conducting sheets.
Optionally, a concave buffer slot is respectively arranged on each conductive sheet, and the buffer slot is formed by bending the conductive sheet.
Optionally, the width of the buffer slot on each of the conductive sheets is equal to or greater than 6 mm, and is less than or equal to 4.7 mm, and the depth of the buffer slot is equal to or greater than 4.7 mm.
Optionally, at least one welding positioning hole and at least one welding observation hole are respectively formed in each position of each conductive sheet, which is opposite to each pole extending hole.
Optionally, at least one welding positioning hole and at least one welding observation hole are respectively formed in the positions, facing the pole extension holes, of the conductive sheets.
Optionally, a plurality of conducting strip mounting positions which are concave relative to the top surface are arranged on the top surface of the isolation plate main body, at least one protruding block which protrudes horizontally is arranged on the vertical wall of each conducting strip mounting position,
and when the conducting strips are positioned in the conducting strip mounting positions, the protruding blocks on the isolating plate column body respectively abut against the top surfaces of the buckle positioning concave platforms.
Optionally, a plurality of vertical positioning pillars are further disposed on the top surface of the main body of the isolation board, and the circuit board assembly penetrates through each of the vertical positioning pillars and is fixed above the main body of the isolation board
As can be seen from the above, in this embodiment, the routing of the voltage sampling lines on the circuit board assembly is designed such that each voltage sampling line passes through at least one explosion-proof hole (or multiple or all) of the isolation board main body. Like this, in case when any battery monomer in the battery module takes place thermal runaway and leads to on fire, high temperature heat from explosion-proof valve blowout (spun flame temperature can reach 1000 ℃ and above), make the voltage sampling circuit in the circuit board subassembly of explosion-proof hole top melt in the twinkling of an eye under this high temperature heat effect, switched the voltage sampling input on this circuit, the BMS system detects this no input state, starts the fault control strategy of battery module, can greatly reduced accident emergence and harm. The BMS system controls the fault of the battery module, such as but not limited to cutting off the power supply of the whole vehicle and sending out a fire alarm signal of the battery module, so as to reduce secondary accidents and minimize damage.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, do not constitute an undue limitation on the invention.
Fig. 1 is a schematic view of an assembly structure of a lithium ion battery module provided in embodiment 1 of the present invention;
fig. 2 is a schematic view of an assembly structure of a busbar and a circuit board assembly provided in embodiment 1 of the present invention on a partition board main body;
fig. 3 is a schematic structural diagram of a circuit board assembly provided in embodiment 1 of the present invention;
fig. 4 is a schematic structural view of a main body of a partition board provided in embodiment 1 of the present invention;
fig. 5 is a schematic structural view of a conductive sheet provided in embodiment 1 of the present invention;
fig. 6 is a schematic structural diagram of a water drop head type temperature sensor provided in embodiment 1 of the present invention;
fig. 7 is a schematic view of a connection structure between a patch type temperature sensor and a nickel plate provided in embodiment 1 of the present invention.
Reference numerals:
1: a battery pack body; 11: a battery cell; 12: an end plate; 13: a lower cover; 14: a steel belt;
15: an explosion-proof valve;
2: a conductive sheet; 21: welding a positioning hole; 22: a buffer tank; 23: welding an observation hole;
3: an insulating upper cover;
4: a separator body; 41: the pole extends out of the hole; 42: reserving a slot;
43: a conducting strip mounting position; 44: a protruding block; 45: an explosion-proof hole;
5: a circuit board assembly; 6: a nickel sheet; 7: water droplet head type temperature sensor.
Detailed Description
The invention will be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions are provided to explain the invention, but not to limit the invention.
Example 1:
see fig. 1-7.
This embodiment provides a lithium ion battery module, and the lithium ion battery module of this embodiment mainly includes: a battery pack body 1, a separator main body 4 made of an insulating material, a circuit board assembly 5, and a plurality of bus bars, and an insulating upper cover 3 covering the top of the battery module.
Wherein the circuit board assembly 5 is fixed on the top of the battery pack body 1, and the bus bar, the circuit board assembly 5 and the insulating upper cover 3 are all installed and fixed on the isolation plate main body 4.
The battery pack body 1 includes a plurality of battery cells 11 fixed together, wherein the fixed connection manner of the battery pack body 1 may be, but is not limited to, as follows: the largest surface area of the battery cells 11 are arranged face to form an integral battery pack body 1, the left and right ends along the stacking direction of the battery cells 11 (i.e. the direction perpendicular to the largest surface area of the cells) are respectively covered with end plates 12, a buffer pad (for buffering the expansion tension of the battery cells 11) is respectively arranged between the end plates 12 and the battery cells 11 opposite to the end plates 12, a steel strip 14 is fastened between the two end plates 12, and the two end plates 12 are fastened at the two ends of the battery module by the steel strip 14, so that the battery pack is formed into an integral body. The bottom end of the battery module is provided with a lower cover 13, the lower cover 13 is fixed at the bottom of the end plate 12 through bolts vertically penetrating through the two end plates 12, and all the battery cells 11 are positioned on the lower cover 13 to form a battery pack body 1.
The ends of the battery cells 11 are upward, the top of the battery pack body 1 is fixed with a partition plate main body 4 of a wiring harness partition plate assembly, the partition plate main body 4 is fixed with a bus bar 2, and the battery cells 11 are electrically connected together by the conductive sheets 2 of the bus bar 2 according to a preset series-parallel circuit structure of the battery cells 11. For example, all the single batteries 11 are connected in series in sequence in a manner that the positive electrode of one single battery 11 is connected with the negative electrode of the next single battery 11, and the positive electrode and the negative electrode at the outermost ends are used as the external electrodes of the battery module, so that the single batteries 11 can be connected in series to form the integrated battery module; for another example, the positive electrodes of all the battery cells 11 are connected together to serve as the positive electrode of the battery module, and the negative electrodes of all the batteries are connected together to serve as the negative electrode of the battery module, so that the battery cells 11 can be connected in parallel to form an integral battery module to provide power to the outside.
At least one explosion-proof valve 15 is respectively arranged at the top of each battery monomer, and each explosion-proof valve 15 is respectively positioned in the area between the two electrodes of the battery monomer, so that when the air pressure inside the battery monomer is greater than the preset air pressure, the explosion-proof valve 15 deflates the battery monomer under the action of the air pressure. When the thermal runaway of the battery cell is ignited, high-temperature flame is sprayed out of the explosion-proof valve 15.
In the present embodiment, two rows of busbars are taken as an illustration, each row of busbars is formed by a plurality of conductive sheets 2 (commonly referred to as "bus sheets" or "conductive sheets"), and the two rows of busbars are oppositely arranged at two sides of the isolation board body 4 and fixed on the top surface of the isolation board body 4, and may be, but not limited to, arranged at the front side and the rear side of the top surface of the isolation board body 4 along the length direction of the isolation board body 4.
The isolating plate main body 4 is provided with a plurality of pole extending holes 41, each pole extending hole 41 vertically penetrates through the isolating plate main body 4, so that the electrode of the battery cell 11 positioned below the isolating plate main body 4 is respectively opposite to one pole extending hole 41 on the isolating plate main body 4, each pole extending hole 41 is respectively covered with a conducting plate 2, and the electrode of the battery cell 11 extends out of the pole extending hole 41 and is welded to the bottom surface (the surface opposite to the battery cell 11) of the conducting plate 2 opposite to the electrode.
The isolating plate main body 4 is also provided with a plurality of explosion-proof holes 45, and each explosion-proof hole 45 is vertically opposite to the explosion-proof valve 15 on each battery pack body respectively, so that the isolating plate main body 4 is prevented from shielding the explosion-proof valve 15.
The circuit board assembly 5 may be, but is not limited to, a flexible circuit board assembly, and the circuit board assembly 5 is fixed to the top surface of the partition board main body 4 between two rows of bus bars. The temperature sampling circuit and the voltage sampling circuit are arranged on the circuit board assembly 5, and the temperature sampling circuit and the voltage sampling circuit can be arranged inside the circuit board assembly 5 in an internal copper foil wiring mode and can also be fixed on the circuit board assembly 5 in an external wire mode. The temperature sampling circuit and the voltage sampling circuit are electrically connected with an external Battery management system (Battery management system, abbreviated BMS system), and the BMS system controls charging and discharging of the lithium ion Battery module according to detected temperature and voltage parameters. The temperature sampling circuit is electrically connected with a temperature sensor through the temperature sampling circuit, but not limited to, the temperature of the battery module can be detected by detecting the temperature of the conducting strips 2 through the temperature sensor, the voltage sampling circuit is electrically connected with each conducting strip 2 through the nickel sheet 6, and the voltage of each single battery 11 node in the battery module is detected in real time. In this embodiment, the routing of the voltage sampling lines on the circuit board assembly 5 is designed such that each voltage sampling line passes at least directly above at least one explosion-proof hole 45 (or more or all of them) on the isolation board main body 4. Like this, in case when any battery monomer in the battery module takes place thermal runaway and leads to on fire, high temperature heat is from explosion-proof valve 15 blowout (spun flame temperature can reach 1000 ℃ and above), make the voltage sampling circuit in the circuit board assembly 5 of explosion-proof hole 45 top melt in the twinkling of an eye under this high temperature heat effect, switched the voltage sampling input on this circuit, the BMS system detects this no input state, start the fault control strategy of battery module, can greatly reduced accident emergence and harm nature. The BMS system controls the fault of the battery module, such as but not limited to cutting off the power supply of the whole vehicle and sending out a fire alarm signal of the battery module, so as to reduce secondary accidents and minimize damage.
The area of the isolation board main body 4 facing the circuit board assembly 5 in this embodiment is further provided with a plurality of reserved slots 42 to reserve enough space for the electronic device or circuit device fixed on the bottom surface of the battery board assembly to meet the size specification requirements of most commonly used electronic devices or circuit devices, and avoid the problem that the isolation board main body 4 and a plurality of busbars in the current size specification cannot be adapted due to the electronic device or circuit device.
For example, when a patch type temperature sensor is adopted, a hole part slightly larger than the patch type temperature sensor is arranged at one end part of a nickel sheet 6 connected with a temperature sampling circuit, the hole part of the nickel sheet 6 is sleeved at the periphery of the patch type temperature sensor and welded with the patch type temperature sensor, the patch type temperature sensor is welded on a circuit board assembly 5 and is connected with the nickel sheet 6, the other end part of the nickel sheet 6 extending out of the circuit board assembly 5 is welded on the top surface of a conducting sheet 2, so that heat on the conducting sheet 2 is transferred to the temperature sensor of the patch type temperature sensor through the nickel sheet 6 with good heat conduction performance, and real-time detection of temperature is realized. As an indication of this embodiment, a heat-conducting structural adhesive may be further coated between the temperature sensor patch type temperature sensor and the nickel plate 6 to ensure the sealing connection between the patch type temperature sensor and the nickel plate 6, so as to prevent the detection precision from being affected by the generation of condensed water at the joint, and in addition, the connection between the nickel plate 6 and the electric conductor may be, but not limited to, laser welding, and a positioning groove for welding and positioning the nickel plate 6 is provided on the top surface of the conducting plate 2, and the positioning groove is slightly lower than the top surface of the conducting plate 2, so that the welding is convenient, and the work efficiency is improved.
For example, when adopting the size specification often than the greatly larger water droplet hair style temperature sensor 7 of SMD temperature sensor, temperature sensor's wire end stretches out from circuit board subassembly 5, temperature sensor's detecting head is fixed on conducting strip 2, temperature sensor is located the outer part of convergent flow piece and suspends in the reservation fluting 42 of division board main part 4, owing to be provided with on division board main part 4 and still be provided with reservation fluting 42 to the region of circuit board subassembly 5, so need not to change division board main part 4 and other relevant parts, make the part of water droplet hair style temperature sensor can the holding in the position of reserving fluting 42, and can not receive the extrusion, ensure temperature sensor's detection reliability.
As an illustration of the present embodiment, the conductive sheets 2 may also be bent to form the buffer grooves 22 on the conductive sheets 2, which are bent and recessed relatively downward, so as to improve the ductility of the conductive sheets 2, and to meet the requirement of expansion tension of the battery during use. On the other hand, can fix the water droplet hair style temperature sensor in buffer slot 22 with conducting strip 2 contact connection end, for example but not limited to fix temperature sensor on buffer slot 22 through the mode of instilling or pouring into but gel water, temperature sensor's detecting head passes through the data line and transmits the temperature data of surveying to the charge-discharge control circuit of circuit board components 5 to control circuit controls the charge-discharge of group battery according to the temperature data of surveying.
As an illustration of the present embodiment, the buffer slots 22 of each conductive plate 2 are designed to be widened and deepened, so that the width of the buffer slot 22 on each conductive plate 2 is equal to or greater than 6 mm, less than or equal to 4.7 mm, and the depth of the buffer slot 22 is equal to or greater than 4.7 mm. Not only improves the extensibility of the conducting strip 2 and the anti-expansion strength, but also reserves enough vertical space for placing the temperature sensor.
As an illustration of the present embodiment, at least one welding positioning hole 21 and at least one welding observation hole 23 are further respectively disposed on each position of each conductive sheet 2 of the present embodiment, which is opposite to each pole extension hole 41 of the isolation plate body 4. During laser welding, the electrode extending from the pole extension hole 41 is bent and tightly attached to the bottom surface of the conductive plate 2, and the laser welding head performs welding around the welding positioning hole 21 to realize connection between the electrode and the conductive plate 2. And the conducting strips and the electrodes can be observed to be flat through the welding observation holes 23, so that cold joint is prevented.
As an illustration of the present embodiment, a plurality of conductive sheet mounting positions 43 recessed from the top surface are provided on the top surface of the isolation board body 4, at least one protruding block 44 protruding horizontally is provided on the vertical wall of each conductive sheet mounting position 43, and correspondingly, the snap positioning concave stage welding observation holes 23 are provided at the edge positions of the top surface of each conductive sheet 2, when each conductive sheet 2 is mounted on the isolation board body 4, the conductive sheet 2 is placed in the conductive sheet mounting positions 43, so that each protruding block on the isolation board column abuts against the top surface of each snap positioning concave stage welding observation hole 23 on the conductive sheet 2, and the conductive sheet 2 is limited in the conductive sheet mounting positions 43, and the planar movement and the up-and-down movement are prohibited.
As an illustration of the present embodiment, a plurality of vertical positioning columns 45 are further provided on the top surface of the partition main body, and when assembling, the circuit board assembly is inserted through each vertical positioning column 45, and the vertical positioning columns 45 fix the position of the circuit board assembly from different positions so as to fix the circuit board assembly above the partition main body.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (10)
1. A lithium ion battery module, comprising:
the battery pack comprises a battery pack body and a battery pack body, wherein the battery pack body comprises a plurality of battery monomers which are fixedly arranged together, the electrode of each battery monomer is positioned at the top of the battery pack body, and an explosion-proof valve is arranged at the end part of each battery monomer where the electrode is positioned and positioned between the two electrodes;
the battery pack comprises an insulating isolation plate main body, wherein a plurality of vertically penetrating pole column extending holes for extending electrodes of each battery monomer are further formed in the isolation plate main body, each pole column extending hole is opposite to each electrode, an explosion-proof hole is further formed between the two rows of pole column extending holes of the isolation plate main body, and each explosion-proof hole is opposite to each explosion-proof valve on the battery pack body;
two bus bars fixed on the top surface of the isolation plate main body, each bus bar comprises at least one conducting strip, each conducting strip covers each pole extending hole, each conducting strip is electrically connected with the electrode between at least two battery monomers,
and the circuit board assembly is fixed on the isolation board main body and positioned between the two rows of busbars, voltage sampling circuits which are respectively and electrically connected with the voltage sampling points preset on the conducting strips are arranged on the circuit board assembly, and each voltage sampling circuit at least passes through the position right above at least one explosion-proof hole in the isolation board main body.
2. The lithium ion battery module of claim 1,
and a reserved groove is also formed in the area, which is opposite to the circuit board assembly, of the isolation board main body, so that a vertical space is reserved for a temperature sensor positioned on the circuit board assembly.
3. The lithium ion battery module of claim 1,
the circuit board assembly is a flexible circuit board.
4. The lithium ion battery module of claim 1,
when the temperature sensor arranged on the circuit board assembly is a patch type temperature sensor,
the temperature sensors are respectively attached to the nickel sheets on the bottom surface of the circuit board assembly, and the end parts of the nickel sheets extending out of the circuit board assembly are respectively and closely fixed to the top surfaces of the conducting sheets.
5. The lithium ion battery module of claim 1,
and each conductive sheet is provided with a sunken buffer groove, and the buffer grooves are formed by bending the conductive sheets.
6. The lithium ion battery module as claimed in claim 5, wherein the width of the buffer slot on each conducting strip is equal to or greater than 6 mm, and is less than or equal to 4.7 mm, and the depth of the buffer slot is equal to or greater than 4.7 mm.
7. The lithium ion battery module of claim 1,
at least one welding positioning hole and at least one welding observation hole are respectively arranged on each position of each conductive sheet, which is opposite to each pole extending hole.
8. The lithium ion battery module of claim 1,
and at least one welding positioning hole and at least one welding observation hole are respectively arranged on each conductive sheet at positions respectively opposite to the pole extending holes.
9. The lithium ion battery module of claim 1,
the top surface of the isolation plate main body is provided with a plurality of conducting strip mounting positions which are sunken relative to the top surface, the vertical wall of each conducting strip mounting position is provided with at least one protruding block which protrudes horizontally,
and when the conducting strips are positioned in the conducting strip mounting positions, the protruding blocks on the isolating plate column body respectively abut against the top surfaces of the buckle positioning concave platforms.
10. The lithium ion battery module of claim 1,
the top surface of the isolation plate main body is also provided with a plurality of vertical positioning columns, and the circuit board assembly penetrates through the vertical positioning columns and is fixed above the isolation plate main body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022033648.2U CN214124001U (en) | 2020-09-16 | 2020-09-16 | Lithium ion battery module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022033648.2U CN214124001U (en) | 2020-09-16 | 2020-09-16 | Lithium ion battery module |
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| CN214124001U true CN214124001U (en) | 2021-09-03 |
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| CN202022033648.2U Active CN214124001U (en) | 2020-09-16 | 2020-09-16 | Lithium ion battery module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114709567A (en) * | 2022-04-19 | 2022-07-05 | 江苏正力新能电池技术有限公司 | Battery module |
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2020
- 2020-09-16 CN CN202022033648.2U patent/CN214124001U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114709567A (en) * | 2022-04-19 | 2022-07-05 | 江苏正力新能电池技术有限公司 | Battery module |
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