CN212587620U - Soft packet of power battery module - Google Patents

Abstract

The utility model provides a pair of soft packet of power battery module, it can include: a housing; a soft pack battery pack housed in the case; the soft package battery pack comprises a plurality of stacked battery cells and a busbar positioned on the outer side of the battery cells; the battery cell is provided with a conductive tab positioned on one side of the busbar; the conductive tabs are electrically connected with the bus bar so that the soft package battery pack can form a current loop; the liquid cooling mechanism is arranged on the shell; the bus bar extends towards the liquid cooling mechanism so that the liquid cooling mechanism can cool the conductive lug and the bus bar; an insulating support positioned on one side of the length direction of the battery cell is arranged in the shell; the insulating bracket is provided with a through hole for the conductive tab to penetrate through; and a busbar is arranged on one side of the insulating support, which is far away from the battery core. The utility model provides an initiative reduces electrically conductive utmost point ear of electric core and busbar temperature, adapts to the soft-packaged power battery module of electric core high magnification charge-discharge.

Description

Soft packet of power battery module

Technical Field

The utility model relates to a soft packet of power battery module.

Background

At present, the application of the soft package power battery is more and more extensive, and the market has higher and higher requirements on high-rate charge and discharge of the soft package power battery. Specifically, the charging rate was 0.5C from the early stage, and even higher to 2C at present. To soft-packaged electrical core, in the high magnification charge-discharge stage, except that the heat that soft-packaged power battery's electric core body section produced is more, the temperature rise is very fast, the electrically conductive utmost point ear part of electric core is more that generates heat usually, and the temperature rise is higher. The connection between the conductive tab of the cell and the cell is usually sealed by heat sealing. When the temperature of the conductive tab rises in the high-rate charging and discharging process, the material packaging strength at the sealing position is reduced, even the sealing is damaged, and serious safety risks such as battery cell leakage and the like are caused. In the prior art, the heat management of the soft package power battery conductive tab is basically passive heat dissipation. Specifically, the heat generated by the conductive tabs of the battery cells is transferred to peripheral components to reduce the temperature of the battery cells, but the actual efficiency is not ideal.

Therefore, it is necessary to provide a soft-package power battery module to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a soft packet of power battery module that can adapt to high multiplying power charge-discharge.

The above object of the present invention can be achieved by the following technical solutions: the utility model provides a laminate polymer power battery module, it includes: a housing; a pouch battery pack housed in the case; the soft package battery pack comprises a plurality of stacked battery cells and a busbar positioned on the outer side of the battery cells; the battery cell is provided with a conductive tab positioned on one side of the busbar; the conductive tabs are electrically connected with the bus bar so that the soft package battery pack can form a current loop; the liquid cooling mechanism is arranged on the shell; the busbar extends towards the liquid cooling mechanism so that the liquid cooling mechanism can cool the conductive tabs and the busbar.

As a preferred embodiment, an insulating support located at one side of the battery cell in the length direction is arranged in the casing; the insulating support is provided with a through hole for the conductive tab to penetrate through; and a bus bar is installed on one side of the insulating support, which is far away from the battery core.

In a preferred embodiment, the liquid cooling mechanism is disposed on a bottom wall of the housing; the surface of the bottom wall of the shell is parallel to the stacking direction of the battery cells; the bottom end of the insulating support is in contact with the bottom wall of the shell.

In a preferred embodiment, the insulating support is provided with a heat conducting member; the heat conducting piece is arranged between the bus bar and the liquid cooling mechanism.

As a preferred embodiment, the insulating support abuts against the bottom wall of the housing, and a heat conducting material is filled between the insulating support and the bottom wall of the housing.

As a preferred embodiment, the heat conductive material is glue.

In a preferred embodiment, the bus bar includes a first extending section and a first bending section disposed on the first extending section and close to the liquid cooling mechanism; the first bending section is provided with a bending surface; the bending surface extends along the surface of the bottom wall of the shell.

In a preferred embodiment, the first bending section is perpendicular to the first extending section.

In a preferred embodiment, the bus bar includes a second bent section disposed at the first extending section and far away from the liquid cooling mechanism; the second bending section and the first bending section are positioned on the same side of the first extending section.

In a preferred embodiment, the bending surface protrudes from the first extending portion in a width direction of the first extending portion.

The application provides a laminate polymer power battery module's beneficial effect is: this application embodiment laminate polymer power battery module through setting up liquid cooling mechanism and busbar for the busbar extends towards liquid cooling mechanism, so that liquid cooling mechanism can cool down the busbar. The conductive tab of the battery cell is electrically connected with the busbar so that the soft package battery pack can form a current loop, and therefore the conductive tab can be cooled through the busbar in the high-rate charge and discharge process; and then avoid this electrically conductive utmost point ear temperature to rise to cause its and the sealed material encapsulation intensity of the department of electric core to reduce, damage even sealed, lead to safety risks such as electric core weeping, so promote the security in high magnification charge-discharge stage. Therefore, the utility model provides a can initiatively reduce electrically conductive utmost point ear of electric core and busbar temperature, adapt to the soft packet of power battery module of electric core high rate charge-discharge.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a side view of a soft package power battery module according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a battery cell according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an insulating support according to an embodiment of the present invention;

fig. 4 is a schematic structural view of another insulating support according to an embodiment of the present invention;

fig. 5 is a cross-sectional view of an insulating support according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of another insulating support provided by an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a bus bar according to an embodiment of the present invention;

fig. 8 is a side view of another side of the soft package power battery module according to an embodiment of the present invention.

Description of reference numerals:

13. a housing; 15. soft-pack battery packs; 17. an electric core; 19. a first conductive tab; 21. a bus bar; 22. a body; 25. a second conductive tab; 27. an insulating support; 31. a through hole; 35. a heat conductive member; 43. a first extension section; 45. a first bending section; 47. a bending surface; 49. a second bending section; 51. a first groove; 57. a second groove; 59. a base plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Please refer to fig. 1 to 7. The application provides a soft packet of power battery module, it can include: a housing 13; a pouch battery pack 15 housed in the case 13; the soft package battery pack 15 comprises a plurality of stacked battery cells 17 and a bus bar 21 positioned outside the battery cells 17; the battery cell 17 is provided with a conductive tab at one side of the busbar 21; the conductive tabs are electrically connected with the bus bar 21 so that a plurality of the soft pack battery packs 15 form a current loop; a liquid cooling mechanism provided on the housing 13; the bus bar 21 extends towards the liquid cooling mechanism, so that the liquid cooling mechanism can cool the bus bar 21.

The technical scheme shows that: this application embodiment laminate polymer power battery module through setting up liquid cooling mechanism and busbar 21 for busbar 21 extends towards liquid cooling mechanism, so that liquid cooling mechanism can cool down busbar 21. And the conductive tab of the battery cell 17 is electrically connected with the busbar 21 so that the soft-package battery pack 15 can form a current loop, so that the conductive tab can be cooled through the busbar 21 in the high-rate charge-discharge process; and then avoid this electrically conductive utmost point ear temperature to rise to cause its and electric core 17 the sealed material encapsulation intensity of department to reduce, damage even sealed, lead to safety risks such as electric core 17 weeping, so promote the security in high magnification charge-discharge stage.

In the present embodiment, the housing 13 has a hollow structure as a whole. The hollow portion forms a cavity for housing the pouch battery pack 15. Further, as shown in fig. 1, the housing 13 includes a top plate, a bottom plate, and side plates enclosed between the top plate and the bottom plate. The top plate, the bottom plate and the side plates form a cavity.

In the present embodiment, the pouch battery pack 15 is housed in the case 13. That is, the pouch battery pack 15 is housed in the cavity of the case 13. Further, the pouch battery pack 15 includes a plurality of stacked cells 17 and a bus bar 21 located outside the cells. Specifically, a plurality of the cells 17 are stacked perpendicular to the thickness direction of the cells 17. Further, the surface of the bottom plate of the casing is parallel to the stacking direction of the battery cells. Further, the number may be 1 or more. The plurality may be 2, 3, 4, 5, etc., and this application does not specify so.

In the present embodiment, the battery cell 17 has a conductive tab on the side of the bus bar 21. The conductive tabs of the battery cells 17 are electrically connected to the bus bar 21 so that the pouch battery pack 15 can form a current loop. Therefore, the conductive tab can be cooled through the bus bar 21 in the high-rate charge and discharge process; and then avoid this electrically conductive utmost point ear temperature to rise to cause its and electric core 17 the sealed material encapsulation intensity of department to reduce, damage even sealed, lead to safety risks such as electric core 17 weeping, so promote the security in high magnification charge-discharge stage. Further, the two ends of the battery cell 17 along the length direction thereof are provided with conductive tabs. That is, the conductive tab of the battery cell 17 includes a first conductive tab 19 located on one side of the battery cell 17 in the length direction and/or a second conductive tab 25 located on the other side of the battery cell 17 in the length direction. For example, as shown in fig. 2, the battery cell 17 includes a body 22 and a first conductive tab 19 and a second conductive tab 25 located on two sides of the body 22. Of course, the first and second conductive tabs 19 and 25 are not limited to being disposed on both sides of the body 22. The first and second conductive tabs 19 and 25 may be disposed on one side of the body 22, which is not specified in this application. Further, the bus bar 21 includes a first bus bar disposed on a side of the battery cell 17 close to the first conductive tab 19 and a second bus bar disposed on a side of the battery cell 17 close to the second conductive tab 25. Further, as shown in fig. 3, for example, the battery cell 17 has a first conductive tab 19 on the side of the first busbar. The first conductive tab 19 is electrically connected to the first busbar. For example, as shown in fig. 8, the battery cell 17 has a second conductive tab 25 on the side of the second busbar. The second conductive tab 25 is electrically connected to the second bus bar. The first bus bar and the second bus bar can form a current loop for the pouch battery pack 15.

In one embodiment, as shown, for example, in fig. 3, the first bus bar is plural. The plurality of first busbars are arranged at intervals. Further, the plurality of first busbars are arranged at intervals along the stacking direction of the battery cells 17 (i.e., perpendicular to the length direction of the battery cells 17), so that the plurality of first busbars are independent from each other and do not contact each other. Each of the first bus bars is disposed between adjacent ones of the battery cells 17. Further, the first conductive tabs 19 of the adjacent battery cells 17 are electrically connected to opposite sides of the first bus bar, respectively. Specifically, the first conductive tabs 19 of the adjacent battery cells 17 are respectively welded to the opposite sides of the first busbar. More specifically, the first conductive tabs 19 of the adjacent cells 17 are respectively bent toward the first bus bars and respectively welded to opposite sides of the first bus bars.

In another embodiment, as shown in fig. 8, for example, the second bus bar is plural. The plurality of second bus bars 21 are arranged at intervals. Further, the plurality of second bus bars are arranged at intervals along the stacking direction of the battery cells 17 (i.e., perpendicular to the length direction of the battery cells 17), so that the plurality of second bus bars are independent from each other and do not contact each other. Each of the second busbars is electrically connected to a second conductive tab 25.

In the present embodiment, the liquid cooling mechanism is provided on the housing 13. For example, the liquid cooling mechanism is provided on the bottom wall of the housing 13. That is, the liquid cooling mechanism is disposed on the bottom plate of the housing 13. Specifically, the liquid cooling mechanism may include a liquid cooling pipe disposed on the bottom plate of the housing 13. The liquid cooling pipe is used for circulating liquid and cold. Thereby make liquid cooling fluid can cool down the bottom plate of casing 13 through liquid cooling fluid circulates in the liquid cooling pipe, and then can cool down laminate polymer battery group 15 in the cavity of casing 13.

Further, the liquid cooling mechanism is disposed outside the bottom wall of the housing 13. Specifically, for example this liquid cooling mechanism sets up on the diapire in the battery system box, this application embodiment the soft packet of power battery module place in this liquid cooling mechanism on to make liquid cooling fluid can cool down the diapire of casing 13 through this liquid cooling mechanism, and then can be to the soft packet of battery group and the cooling of busbar 21 in the casing 13 inner chamber.

Further, the bus bar 21 extends toward the liquid cooling mechanism so that the liquid cooling mechanism can cool the bus bar 21. Because to laminate polymer battery group 15, in the high magnification charge-discharge stage, except that the heat that the body 22 section of electric core 17 produced is more, the temperature rise is faster, the electrically conductive utmost point ear part of electric core 17 generates heat more usually, and the temperature rise is higher. And the connection between the conductive tab of the cell 17 and the cell 17 is usually sealed by heat sealing. When the temperature of the conductive tab rises in the high-rate charging and discharging process, the material packaging strength at the sealing position may be reduced, and even the sealing is damaged, so that serious safety risks such as liquid leakage of the battery cell 17 are caused. The soft-package power battery module according to the embodiment of the application extends the bus bar 21 towards the liquid cooling mechanism, so that the liquid cooling mechanism can cool the bus bar 21; thereby make busbar 21 can cool down the electrically conductive utmost point ear of electric core 17, so avoid electrically conductive utmost point ear to cause the material encapsulation intensity of sealed department to reduce, damage sealed even when the temperature risees in high-rate charge-discharge process, lead to safety risks such as electric core 17 weeping, so adapt to high-rate charge-discharge. As shown in fig. 5 and 6, for example, the first bus bar extends in the up-down direction so as to be able to approach the bottom plate of the housing 13. Thus, the liquid cooling mechanism on the bottom plate of the casing 13 can rapidly cool the first bus bar, and the first bus bar cools the first conductive tab 19 of the battery cell 17.

In one embodiment, as shown in fig. 3 and 4, an insulating support 27 is provided in the housing 13 at one side in the longitudinal direction of the battery cell 17. The insulating support 27 comprises, for example, a first insulating support disposed on one side of the first conductive tab 19. Further, the insulating support 27 further includes a second insulating support disposed at one side of the second conductive tab 25. Further, the insulating support 27 is provided with a through hole 31 for the conductive tab to pass through. As shown in fig. 5, for example, the first insulating support is provided with a through hole 31 for the first conductive tab 19 to pass through. The through hole 31 is elongated and extends in the vertical direction. Of course, the through hole 31 is not limited to a long shape, and may be a block shape. The side of the insulating support 27 remote from the cells 17 is fitted with a busbar 21. Specifically, the insulating support 27 has a first side facing the cell 17 and a second side facing away from the cell 17. The bus bar 21 is mounted on the second side surface. So that the conductive tabs can be welded to the bus bar 21 through the through holes 31. Further, since the insulating support 27 has an insulating property, the conductive tab penetrating through the through hole 31 of the insulating support 27 can ensure the insulation requirement between the conductive tab and the top plate, the bottom plate and the side plates of the housing 13. Further, the housing 13 includes a first side plate facing the insulating support 27 and a second side plate facing away from the insulating support 27, and a third side plate and a fourth side plate located between the first side plate and the second side plate. The first side plate, the second side plate and the third side plate are arranged around the outside of the insulating bracket 27. Further, the material of the insulating support 27 may be, for example, a highly heat conductive plastic.

Further, the bottom end of the insulating holder 27 is in contact with the bottom wall of the housing 13. Specifically, the insulating support 27 abuts against the bottom wall of the housing 13, and a heat conductive material is filled between the insulating support 27 and the bottom wall of the housing 13. So that the heat transfer between the housing 13 and the insulating support 27 can be accelerated by the heat conductive material. Further, the heat conducting material is glue. I.e. the bottom surface of the insulating support 27 is glued to the bottom wall of the housing 13. Therefore, on one hand, the liquid cooling mechanism on the bottom plate of the shell 13 can cool the busbar 21 on the bottom plate through the insulating bracket 27, so that the temperature of the conductive tab of the battery cell 17 is reduced; on the other hand, the insulating holder 27 can be fixed to the housing 13 by means of glue.

In one embodiment, as shown in fig. 4 and 6, the insulating support 27 is provided with a heat conductive member 35. The heat conduction member 35 is provided between the bus bar 21 and the liquid cooling mechanism. And the heat conducting member 35 is insulated from the bus bar 21 and the liquid cooling means. The heat conducting element 35 can thus accelerate the transfer of heat from the conductive tab of the cell 17 to the liquid cooling mechanism on the bottom plate of the housing 13. Further, the heat conductive member 35 may be, for example, aluminum. Of course, the heat conducting member 35 is not limited to aluminum, and may be another heat conducting member 35, such as copper, for example, which is not limited in this application.

In another embodiment, the bus bar 21 includes a first extension 43 and a first bend 45 disposed on the first extension 43 proximate the liquid cooling mechanism. As shown in fig. 7, for example, the first extension 43 extends in a vertical direction. The first bending section 45 is disposed at the bottom end of the first extending section 43. Further, the first bending section 45 has a bending surface 47 protruding from the first extending section 43 in the width direction of the first extending section 43. As shown in fig. 7, for example, the width of the bending surface 47 in the width direction of the first extending portion 43 is larger than the width of the first extending portion 43. The bent surface 47 extends along the bottom wall of the housing 13. Because the width of the bending surface 47 along the width direction of the first extending section 43 is greater than the width of the first extending section 43, the heat on the bending surface 47 can be accelerated to the speed of transferring to the liquid cooling mechanism on the bottom plate of the casing 13 by extending the bending surface 47 along the bottom wall of the casing 13, and then the heat on the conductive tab of the battery cell 17 is accelerated to the speed of transferring to the liquid cooling mechanism on the bottom plate of the casing 13. Further, the first bending section 45 is disposed perpendicular to the first extending section 43.

Further, the bus bar 21 includes a second bent section 49 disposed at the first extending section 43 away from the liquid cooling mechanism. For example, as shown in fig. 7, the second bending portion 49 is disposed at the top end of the first extending portion 43. The second bend 49 is located on the same side of the first extension 43 as the first bend 45. For example, as shown in fig. 7, the second bending section 49 and the first bending section 45 are located at the left side of the first extending section 43. Further, the second bending section 49 is disposed perpendicular to the first extending section 43.

Further, the insulating support 27 is provided with a first groove 51 for the first bending section 45 to be inserted in and a second groove 57 for the second bending section 49 to be inserted in. As shown in fig. 5, the first groove 51 is located above the second groove 57. So that the first bent section 45 and the second bent section 49 can be fitted into the first groove 51 and the second groove 57, respectively, thereby allowing the bus bar 21 to be mounted on the insulating support 27. Further, the through hole 31 is located between the first groove 51 and the second groove 57. So that the conductive tabs can be welded to the first extension 43 of the bus bar 21 after being inserted into the through holes 31. Of course, the manner in which the bus bar 21 is attached to the insulating holder 27 is not limited to the first groove 51 and the second groove 57, and other manners are possible, for example, the bus bar 21 and the insulating holder 27 are integrally molded, and the present application is not limited thereto. Further, the insulating support 27 is made of a material having a thermal conductivity greater than 0.5W/m.k and a thermal deformation temperature greater than 100 ℃.

It should be noted that, in the description of the present application, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is intended or should be construed to indicate or imply relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego the subject matter and should not be construed as an admission that the applicant does not consider such subject matter to be part of the disclosed subject matter.

Claims (10)

1. The utility model provides a soft packet of power battery module which characterized in that, it includes:

a housing;

a pouch battery pack housed in the case; the soft package battery pack comprises a plurality of stacked battery cells and a busbar positioned on the outer side of the battery cells; the battery cell is provided with a conductive tab positioned on one side of the busbar; the conductive tabs are electrically connected with the bus bar so that the soft package battery pack can form a current loop;

the liquid cooling mechanism is arranged on the shell; the busbar extends towards the liquid cooling mechanism so that the liquid cooling mechanism can cool the conductive tabs and the busbar.

2. The soft package power battery module according to claim 1, wherein an insulating support is arranged in the housing and located on one side of the battery cell in the length direction; the insulating support is provided with a through hole for the conductive tab to penetrate through; and a bus bar is installed on one side of the insulating support, which is far away from the battery core.

3. The soft-package power battery module according to claim 2, wherein the liquid cooling mechanism is disposed on the bottom wall of the housing; the surface of the bottom wall of the shell is parallel to the stacking direction of the battery cells; the bottom end of the insulating support is in contact with the bottom wall of the shell.

4. The soft-package power battery module according to claim 2, wherein the insulating support is provided with a heat conducting member; the heat conducting piece is arranged between the bus bar and the liquid cooling mechanism.

5. The soft package power battery module of claim 2, wherein the insulating support abuts against the bottom wall of the housing, and a heat conducting material is filled between the insulating support and the bottom wall of the housing.

6. The soft-packaged power battery module according to claim 5, wherein the heat conducting material is glue.

7. The soft package power battery module according to claim 2, wherein the bus bar comprises a first extension section and a first bending section arranged on the first extension section and close to the liquid cooling mechanism; the first bending section is provided with a bending surface; the bending surface extends along the surface of the bottom wall of the shell.

8. The soft-packaged power battery module according to claim 7, wherein the first bending section is perpendicular to the first extending section.

9. The soft package power battery module according to claim 7, wherein the bus bar comprises a second bent section disposed at the first extending section away from the liquid cooling mechanism; the second bending section and the first bending section are positioned on the same side of the first extending section.

10. The soft package power battery module of claim 7, wherein the bending surface protrudes from the first extension along the width direction of the first extension.

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