CN219321581U

CN219321581U - Power battery module and battery pack

Info

Publication number: CN219321581U
Application number: CN202223517629.2U
Authority: CN
Inventors: 陈保国; 刘峰; 于昊; 张福增
Original assignee: Tianjin EV Energies Co Ltd
Current assignee: Tianjin EV Energies Co Ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-07-07
Anticipated expiration: 2032-12-28

Abstract

The utility model relates to the technical field of power battery manufacturing, in particular to a power battery module and a battery pack. The power battery module mainly comprises an electric core, an insulating sheet, an aluminum row bracket and a series aluminum row. The battery cells are arranged in a plurality, and the battery cells are stacked along a first direction to form a battery cell group. The insulating sheet is adhered between two adjacent electric cores, and along the second direction, the side end of the insulating sheet protrudes out of the end face of the electric core. Along the second direction, the aluminum row bracket is arranged on the end face of the battery cell group, and a plurality of aluminum rows connected in series are arranged on the aluminum row bracket and are welded with the poles of the battery cells; the aluminum row support is provided with a first groove, and the side end of the insulating sheet is accommodated in the first groove. The power battery module has the advantages of simple structure, capability of bearing larger quick charging current, high voltage resistance, capability of meeting the voltage requirement of 800V or above, prolonged service life of the battery pack and improvement of the safety performance of the battery pack.

Description

Power battery module and battery pack

Technical Field

The utility model relates to the technical field of power battery manufacturing, in particular to a power battery module and a battery pack.

Background

Along with the development of economy and technological progress, the technology of new energy automobiles is rapidly developed, and the new energy automobiles have remarkable advantages in power performance, intelligence, use cost and the like compared with the traditional fuel oil automobiles, but are still in urgent need of improvement in the aspects of endurance mileage and quick charge.

Increasing the charging power by increasing the voltage of the battery system to a level of 800V or even higher has become one of the main developments in the industry. Most of the existing power battery modules are developed based on 400V battery systems, and the busbar overcurrent capacity, the module voltage resistance and the design of a thermal management interface of the existing 400V battery systems cannot meet the requirements of 800V battery systems. That is, the current capacity of the bus bar of the power battery module in the prior art mostly meets the requirement of a 400V system, and only can meet the continuous current capacity of 150A-400A, while the fast charging current of an 800V battery system is generally more than 500A; the existing power battery module withstand voltage design is based on the requirement of 400V, the voltage doubling requirement of an 800V battery system on the withstand voltage performance of the battery module is obviously improved, and the battery module in the prior art cannot bear the voltage of 800V; most of the existing power battery modules adopt a bottom liquid cooling mode, however, the 800V battery system cannot meet the thermal management requirement of the battery system due to the improvement of the fast charging power.

Therefore, there is a need to design a power battery module and a battery pack to solve the above technical problems.

Disclosure of Invention

The first object of the present utility model is to provide a power battery module, which has a simple structure, can withstand larger rapid charging current, has high voltage resistance, and can meet the voltage requirement of 800V and above.

To achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a power battery module, comprising:

the battery cells are arranged in a plurality, and the battery cells are stacked along a first direction to form a battery cell group;

the insulating sheets are adhered between two adjacent electric cores, and the side ends of the insulating sheets protrude out of the end faces of the electric cores along the second direction;

the aluminum row support is arranged on the end face of the battery cell group along the second direction, and a plurality of series aluminum rows are arranged on the aluminum row support and are connected with the poles of the battery cells in a welding mode; the aluminum row support is provided with a first groove, and the side end of the insulating sheet is accommodated in the first groove.

As an alternative technical scheme of the power battery module, the power battery module comprises an output row bracket, and the output row bracket is arranged at the end part of the battery cell group along the first direction; the output row support is provided with a second groove, and along the first direction, the first insulating sheet or the last insulating sheet is accommodated in the second groove.

As an alternative technical scheme of the power battery module, the insulating sheet is in a shape like a Chinese character 'hui', and the hollow part of the insulating sheet is filled with structural adhesive, and the structural adhesive is configured to be adhered to two adjacent electric cores.

As an alternative technical scheme of the power battery module, the aluminum row support is provided with a buckle, and the buckle is clamped on the upper end face of the serial aluminum row.

As an optional technical scheme of power battery module, be provided with a plurality of double isolation muscle on the aluminium row support, two adjacent double isolation muscle with the aluminium row support defines the accommodation space jointly, the buckle sets up in the accommodation space, every establish ties aluminium row sets up in one in the accommodation space.

As an alternative technical scheme of power battery module, power battery module still includes FPC, be provided with the sampling piece on the FPC, it has the bulge to extend on the aluminium row of establishing ties, the sampling piece welding is in on the bulge, so that FPC with establish ties aluminium row welding conductive connection.

As an alternative technical scheme of the power battery module, a positioning hole is formed in the FPC, a hot-melt column is arranged on the aluminum row support, and the hot-melt column penetrates through the positioning hole.

As an alternative technical scheme of power battery module, be provided with the compound row of output on the output row support, the compound row of output includes copper bar and aluminium row, the copper bar with aluminium row ultrasonic welding connects, just the aluminium row sets up and is close to one side of utmost point post, the aluminium row with utmost point post welded connection.

As an alternative technical scheme of power battery module, dodge the hole has been seted up on the copper bar, dodge the hole be used for the utmost point post with the aluminium row provides the welding area.

The second object of the present utility model is to provide a battery pack, which has a simple structure, and can improve the voltage resistance and the overcurrent performance of the battery pack, so that the battery pack meets the requirements of an 800V battery system, the service life of the battery pack is prolonged, and the safety performance of the battery pack is improved.

the utility model provides a battery pack, which comprises the power battery module.

The beneficial effects of the utility model at least comprise:

the utility model provides a power battery module which mainly comprises an electric core, an insulating sheet, an aluminum row bracket and a series aluminum row. The battery cells are arranged in a plurality, and the battery cells are stacked along a first direction to form a battery cell group. The insulating sheet is adhered between two adjacent electric cores, and along the second direction, the side end of the insulating sheet protrudes out of the end face of the electric core. Along the second direction, the aluminum row bracket is arranged on the end face of the battery cell group, and a plurality of aluminum rows connected in series are arranged on the aluminum row bracket and are welded with the poles of the battery cells; the aluminum row support is provided with a first groove, and the side end of the insulating sheet is accommodated in the first groove. Through set up first recess on the aluminium row support, two side end surfaces of insulating piece are held in first recess, and then increase the electric gap and the creepage distance of the utmost point post on two adjacent electric cores to improve the withstand voltage performance of electric core group, make power battery module can bear 800V or above's voltage, improve power battery module's security performance. Meanwhile, the battery cell adopts a structure with two output ends, the width of the electrode column of the battery cell is wider than that of the electrode column of the battery cell with the same output end in the traditional technology, and meanwhile, the width of the serial aluminum row is wider than that of the electrode column of the battery cell, so that the overcurrent capacity of the power battery module is improved, and the power battery module can bear continuous and rapid charging current of more than 500A.

The utility model also provides a battery pack which has a simple structure, and can improve the pressure resistance and the overcurrent performance of the battery pack, so that the battery pack meets the requirements of an 800V battery system, the service life of the battery pack is prolonged, and the safety performance of the battery pack is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the drawings needed in the description of the embodiments of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the contents of the embodiments of the present utility model and these drawings without inventive effort for those skilled in the art.

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

fig. 2 is an exploded view of a power battery module according to an embodiment of the present utility model;

fig. 3 is a schematic structural view of a power battery module (with side plates and end plates removed) according to an embodiment of the present utility model;

fig. 4 is a top view of a power battery module (with side plates and end plates removed) according to an embodiment of the present utility model;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

fig. 6 is an exploded view of a power battery module (with side plates and end plates removed) according to an embodiment of the present utility model.

Reference numerals

100. A battery cell; 110. a pole; 120. an explosion-proof valve;

200. an insulating sheet;

300. an aluminum row bracket; 310. serially connecting aluminum rows; 3101. a protruding portion; 320. a first groove; 330. a buckle; 340. double rows of isolation ribs; 350. a hot melt column;

400. an output row support; 410. a second groove; 420. outputting a composite row; 4201. a copper bar; 4202. an aluminum row; 4203. avoidance holes;

500. an FPC; 510. sampling sheet; 520. positioning holes;

600. an end plate; 610. a module top cover;

700. a side plate; 710. a heat insulating mat; 720. an insulating film; 730. and an exhaust hole.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1-3, the present embodiment provides a power battery module, which mainly includes an electric core 100, an insulating sheet 200, an aluminum row bracket 300 and a serial aluminum row 310. The plurality of battery cells 100 are arranged, and the plurality of battery cells 100 are stacked along the first direction to form a battery cell group. The insulating sheet 200 is adhered between two adjacent cells 100, and the side ends of the insulating sheet 200 protrude from the end surfaces of the cells 100 in the second direction. Along the second direction, the aluminum row bracket 300 is arranged on the end face of the battery cell group, a plurality of serial aluminum rows 310 are arranged on the aluminum row bracket 300, and the serial aluminum rows 310 are connected with the poles 110 of the battery cell 100 in a welding way; as shown in fig. 4 to 5, the aluminum bar bracket 300 is provided with a first groove 320, and the side end of the insulating sheet 200 is received in the first groove 320. It should be noted that, the first direction in the present embodiment is the X-axis direction in fig. 1, that is, the thickness direction of the battery cell group; the second direction is the Y-axis direction in fig. 1, that is, the width direction of the cell group; in addition, the Z-axis direction in fig. 1 is the third direction, i.e. the height direction of the cell group.

Based on the above design, in the present embodiment, two side ends of the insulating sheet 200 along the second direction are protruded from the end faces of the electric core 100, and when the aluminum row bracket 300 is installed in place, two side end faces of the insulating sheet 200 can be matched with the first groove 320 and accommodated in the first groove 320, so that the electric gap and the creepage distance of the pole columns 110 on two adjacent electric cores 100 can be increased, the voltage withstanding performance of the electric core group is improved, the power battery module can bear voltage of 800V or above, and the safety performance of the power battery module is improved.

Further, as shown in fig. 3 to 5, the power battery module in this embodiment includes an output row bracket 400, and the output row bracket 400 is disposed at an end of the battery cell group along the first direction; the output row support 400 is provided with a second groove 410, and the first insulating sheet 200 or the last insulating sheet 200 is accommodated in the second groove 410 along the first direction, so that the first insulating sheet 200 and the last insulating sheet 200 on the battery cell group can be accommodated in the second groove 410, and the electrical gap and the creepage distance of the polar columns 110 on the two adjacent battery cells 100 are further increased, thereby improving the voltage withstanding performance of the battery cell group.

Alternatively, the battery cell 100 in this embodiment adopts a structure with two output ends, and the width of the terminal 110 of the battery cell 100 is wider than that of the terminal 110 of the battery cell 100 with the same output end in the conventional technology, for example, the width can be increased by 2mm-5mm. Meanwhile, the width of the serial aluminum row 310 is larger than the width of the terminal 110 of the battery cell 100, for example, the width can be increased by 2mm-5mm. Therefore, the power battery module can meet the overcurrent capacity of the 800V battery system, and the overcurrent capacity of the power battery module is improved.

Compared with the prior art, the power battery module in this embodiment has a simple structure, and the two side end surfaces of the insulating sheet 200 are accommodated in the first groove 320 by arranging the first groove 320 on the aluminum row bracket 300, so that the electric gap and the creepage distance of the pole posts 110 on two adjacent battery cells 100 are increased, the voltage withstand performance of the battery cell group is improved, the power battery module can bear 800V or more voltage, and the safety performance of the power battery module is improved. Meanwhile, the battery cell 100 adopts a structure with two output ends, the width of the pole 110 of the battery cell 100 is wider than that of the pole 110 of the battery cell 100 with the same output end in the prior art, and meanwhile, the width of the serial aluminum row 310 is wider than that of the pole 110 of the battery cell 100, so that the overcurrent capacity of the power battery module is improved, and the power battery module can bear continuous and rapid charging current of more than 500A.

As shown in fig. 2, in this embodiment, the insulating sheet 200 is in a shape of a Chinese character 'hui', and the hollow portion of the insulating sheet 200 in the shape of a Chinese character 'hui' is filled with structural adhesive, and the structural adhesive is configured to adhere two adjacent cells 100, thereby improving stability and reliability of the cell group. Of course, the operator can flexibly set the shape and the size of the insulating sheet 200 according to the actual requirement, which is not described here again.

As shown in fig. 3 and 6, in the present embodiment, the aluminum row bracket 300 is provided with a buckle 330, and the buckle 330 is clamped to the upper end surface of the serial aluminum row 310. The arrangement of the buckles 330 can enable the aluminum row bracket 300 to pre-position the serial aluminum row 310, so that the stability and reliability of welding the serial aluminum row 310 and the pole 110 can be facilitated.

Preferably, as shown in fig. 3 and 6, the aluminum row bracket 300 in this embodiment is provided with a plurality of double-row isolating ribs 340, two adjacent double-row isolating ribs 340 and the aluminum row bracket 300 together define a containing space, the buckle 330 is disposed in the containing space, and each series aluminum row 310 is disposed in one containing space. The arrangement of the double-row isolating ribs 340 can increase the electric gap and the creepage distance between two adjacent series aluminum rows 310, thereby improving the pressure resistance between the series aluminum rows 310.

As shown in fig. 3 and 6, in the present embodiment, the power battery module further includes an FPC 500 (flexible circuit board), the FPC 500 is provided with a sampling sheet 510, the serial aluminum row 310 is extended with a protruding portion 3101, the sampling sheet 510 is welded on the protruding portion 3101, so that the FPC 500 is in welded conductive connection with the serial aluminum row 310, the effective welding area of the serial aluminum row 310 and the terminal 110 of the battery cell 100 can be ensured not to be reduced due to the arrangement of the sampling sheet 510 by the arrangement of the protruding portion 3101, and the reliability and stability of welding the serial aluminum row 310 and the terminal 110 of the battery cell 100 are further improved. Meanwhile, through holes are designed on the serial aluminum row 310 in the embodiment, and the through holes are aligned with the circular grooves on the pole 110 of the battery cell 100 to serve as positioning points for welding, so that the welding accuracy of the serial aluminum row 310 and the pole 110 is improved.

Further, the positioning hole 520 is formed in the FPC 500 in the present embodiment, the heat-melting column 350 is disposed on the aluminum row bracket 300, and the heat-melting column 350 is inserted into the positioning hole 520, so that the heat-melting column 350 can position and fix the FPC 500, and the problem that the FPC 500 is displaced or rocked is avoided.

As shown in fig. 6, in the present embodiment, an output composite row 420 is disposed on the output row support 400, the output composite row 420 includes a copper row 4201 and an aluminum row 4202, the copper row 4201 is connected with the aluminum row 4202 by ultrasonic welding, and the aluminum row 4202 is disposed at a side close to the pole 110, and the aluminum row 4202 is connected with the pole 110 by welding. The arrangement of the copper bar 4201 can avoid torque attenuation of the output composite bar 420 during long-term use, thereby ensuring reliability and stability of external electrical connection of the power battery module and prolonging service life of the power battery module. The copper bar 4201 is provided with a relief hole 4203, the relief hole 4203 may be rectangular, and the relief hole 4203 is used to provide a welding area for the pole 110 and the aluminum bar 4202.

Optionally, the aluminum row 4202 and the terminal 110 of the battery 100 are made of aluminum alloy, so that the cost is saved, the weight of the power battery module is reduced, and the weldability and the welding stability of the aluminum row 4202 and the terminal 110 of the battery 100 can be ensured.

As shown in fig. 1-2, in the present embodiment, the power battery module further includes 2 side plates 700 and 2 end plates 600, the end plates 600 are disposed on the output row support 400 along the first direction, and a module top cover 610 is disposed between the output row support 400 and the end plates 600; the side plate 700 is disposed on the aluminum row bracket 300 along the second direction, and a heat insulation pad 710 is disposed between the side plate 700 and the aluminum row bracket 300, for improving heat insulation performance of the power battery module. An insulating film 720 is provided on the inner side of the side plate 700 to improve the insulating performance between the side plate 700 and the cell group.

Further, overlap joint position between curb plate 700 and end plate 600 is connected through laser welding, and curb plate 700, end plate 600 and the top surface three of electric core group enclose jointly and establish into first holding cavity, and curb plate 700, end plate 600 and the bottom surface three of electric core group enclose jointly and establish into the second holding cavity, and all the coating has the heat conduction glue in first holding cavity and the first holding cavity, and the liquid cooling board sets up to two, and two liquid cooling boards are connected at first holding cavity and second holding cavity through the heat conduction glue subsides respectively for carry out the heat exchange to the heat of electric core group. The power battery module in the embodiment has the function of double-side liquid cooling, so that the heat dissipation performance of the power battery module is improved, the requirement of the fast charging power of the 800V battery system on the heat management is met, and the safety performance of the power battery module is improved.

As shown in fig. 2, in this embodiment, the explosion-proof valve 120 is disposed on the battery cell 100, and the vent holes 730 are formed in the aluminum row support 300, the heat insulation pad 710, and the side plate 700 and in positions corresponding to the explosion-proof valve 120 on the battery cell 100, when the battery cell 100 is out of control, the explosion-proof valve 120 is opened, so that high-temperature and high-pressure gas inside the battery cell 100 can be discharged through the vent holes 730 on the aluminum row support 300, the heat insulation pad 710, and the side plate 700, thereby achieving the purposes of pressure relief and thermal expansion delay.

The embodiment also provides a battery pack, which comprises the power battery module. The battery pack has a simple structure, and can improve the pressure resistance and overcurrent performance of the battery pack, so that the battery pack meets the requirements of an 800V battery system, the service life of the battery pack is prolonged, and the safety performance of the battery pack is improved.

It is to be understood that the foregoing is only illustrative of the presently preferred embodiments of the utility model and the technical principles that have been developed. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Note that in the description of this specification, a description referring to terms "some embodiments", "other embodiments", and the like, means 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 utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Claims

1. A power battery module, comprising:

the battery cells (100), wherein a plurality of battery cells (100) are arranged, and the battery cells (100) are stacked along a first direction to form a battery cell group;

the insulating sheets (200) are adhered between two adjacent electric cores (100), and the side ends of the insulating sheets (200) protrude out of the end surfaces of the electric cores (100) along the second direction;

the aluminum row support (300) is arranged on the end face of the battery cell group along the second direction, a plurality of series aluminum rows (310) are arranged on the aluminum row support (300), and the series aluminum rows (310) are connected with the pole columns (110) of the battery cells (100) in a welding mode; the aluminum row support (300) is provided with a first groove (320), and the side end of the insulating sheet (200) is accommodated in the first groove (320).

2. The power battery module according to claim 1, characterized in that the power battery module comprises an output row holder (400), the output row holder (400) being arranged at an end of the cell stack in the first direction; the output row support (400) is provided with a second groove (410), and along the first direction, a first insulating sheet (200) or a last insulating sheet (200) is accommodated in the second groove (410).

3. The power battery module according to claim 1, wherein the insulating sheet (200) is in a shape of a Chinese character 'hui', and the hollow of the insulating sheet (200) in the shape of a Chinese character 'hui' is filled with structural adhesive configured to adhere two adjacent electric cells (100).

4. The power battery module according to claim 1, wherein a buckle (330) is provided on the aluminum row bracket (300), and the buckle (330) is clamped to the upper end face of the serial aluminum row (310).

5. The power battery module according to claim 4, wherein a plurality of double-row isolation ribs (340) are provided on the aluminum row support (300), two adjacent double-row isolation ribs (340) and the aluminum row support (300) together define a containing space, the buckle (330) is disposed in the containing space, and each of the series aluminum rows (310) is disposed in one of the containing spaces.

6. The power battery module according to claim 1, further comprising an FPC (500), wherein a sampling sheet (510) is provided on the FPC (500), a protrusion (3101) is extended on the serial aluminum row (310), and the sampling sheet (510) is welded on the protrusion (3101) so that the FPC (500) is in welded conductive connection with the serial aluminum row (310).

7. The power battery module according to claim 6, wherein a positioning hole (520) is formed in the FPC (500), a hot-melt column (350) is disposed on the aluminum row bracket (300), and the hot-melt column (350) is inserted into the positioning hole (520).

8. The power battery module according to claim 2, wherein an output composite row (420) is provided on the output row support (400), the output composite row (420) includes a copper row (4201) and an aluminum row (4202), the copper row (4201) is connected with the aluminum row (4202) by ultrasonic welding, the aluminum row (4202) is provided at a side close to the pole (110), and the aluminum row (4202) is connected with the pole (110) by welding.

9. The power battery module according to claim 8, wherein the copper bar (4201) is provided with a relief hole (4203), and the relief hole (4203) is configured to provide a welding area for the pole (110) and the aluminum bar (4202).

10. A battery pack, characterized in that the battery pack comprises the power battery module according to any one of claims 1 to 9.