CN218769997U

CN218769997U - Battery pack

Info

Publication number: CN218769997U
Application number: CN202223361459.3U
Authority: CN
Inventors: 魏江鹏; 丁扬; 邱坤文; 蒋豪
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-12-14
Filing date: 2022-12-14
Publication date: 2023-03-28
Anticipated expiration: 2032-12-14

Abstract

The application relates to a battery pack, which relates to the field of battery technology and comprises an end plate, a support and an output electrode; the end plate is provided with a groove, and at least part of the support is positioned in the groove and is fixedly connected with the end plate; the support is fixedly connected with the output pole in an insulating way so as to support the output pole; the minimum clearance between the output pole and the side wall and the bottom wall of the groove is larger than a set clearance, and the set clearance is an electric clearance between the output pole and the end plate. This application has the effect that reduces the short circuit risk between output utmost point and the end plate through increasing the clearance between output utmost point and the recess.

Description

Battery pack

Technical Field

The application relates to the technical field of batteries, in particular to a battery pack.

Background

The conventional battery pack comprises single batteries, a conductive bar and an end plate, wherein the conductive bar is in conductive connection with the single batteries in the battery pack, and the battery pack exchanges electric energy with external equipment through an output electrode on the conductive bar; the end plate is fixedly connected with the single battery. The output electrode on the conducting bar needs to be fixedly connected with the end plate, the support is an insulating piece for separating the conducting bar from the end plate, and the support keeps the stability of the output electrode.

When the battery pack breaks down and the support is heated and melted, the end plates and the conductive bars are possibly communicated in a conductive mode, so that the risk of short circuit exists in the battery pack.

SUMMERY OF THE UTILITY MODEL

The present application provides a battery pack for reducing the risk of short circuits between an output pole and an end plate.

The application provides a battery pack, which comprises an end plate, a support and an output pole; the end plate is provided with a groove, and at least part of the support is positioned in the groove and is fixedly connected with the end plate; the support is fixedly connected with the output pole in an insulating way so as to support the output pole; the minimum clearance between the output pole and the side wall and the bottom wall of the groove is larger than a set clearance, and the set clearance is an electric clearance between the output pole and the end plate.

In the technical scheme, the output pole is supported by using the support, and meanwhile, the insulation between the output pole and the end plate is kept; after the support is heated and melted, the gap between the output electrode and the side wall and the bottom wall of the groove is still larger than the electric gap, so that a good insulating effect is still achieved between the output electrode and the end plate, and the risk of short circuit between the output electrode and the end plate after the support is melted is reduced.

Drawings

FIG. 1 is a schematic diagram of an embodiment in which an end plate is secured to an end plate by a bracket;

FIG. 2 is a schematic diagram showing the structure of an output electrode in relation to a support in one embodiment;

FIG. 3 is a schematic diagram illustrating an embodiment of the output electrode and the grooves on the end plate;

FIG. 4 is a schematic diagram of the structure of the output pole and the end plate in one embodiment.

1. An end plate; 11. a groove; 12. round corners; 13. a abdication gap; 2. a support; 3. a conductive bar; 31. an output electrode; 4. a connecting member.

Detailed Description

The present application is described in further detail below with reference to the figures and examples. The features and advantages of the present application will become more apparent from the description.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not conflict with each other.

The embodiment of the application discloses a battery pack, and an exemplary description is given to a structural form of the battery pack, wherein the battery pack comprises a plurality of single batteries, two end plates and two side plates. A plurality of battery cells are arranged and placed, two end plates are respectively arranged at the end parts of the plurality of battery cells to tightly press the plurality of battery cells, two side plates are positioned at two sides of the plurality of battery cells and fixedly connected with the two end plates to fix the plurality of battery cells.

Referring to fig. 1, the battery pack further includes a bus bar, a holder 2. The bus bar is in conductive connection with the single batteries, the external equipment is in conductive connection with the bus bar, and the bus bar is used for electric energy exchange between the single batteries and the external equipment. The support 2 is fixedly connected with the end plate 1 and the bus bar, and the support 2 is arranged at the position where the bus bar is electrically connected with external equipment and supports the bus bar. Note that the holder 2 is an insulating member, and the holder 2 maintains insulation between the bus bar and the end plate 1.

For convenience of description, a first direction, a second direction and a third direction are defined, wherein the first direction is a length direction of the battery pack and is also an arrangement direction of the single batteries; the second direction is a width direction of the battery pack, and the third direction is a height direction of the battery pack. In the drawings, the first direction is denoted as an X direction, the second direction is denoted as a Y direction, and the third direction is denoted as a Z direction.

For an exemplary description of a connection manner between the support 2 and the end plate 1, the end plate 1 and the support 2 are fixed in an inserting manner, wherein a cavity is arranged at an end portion of the end plate 1 along a third direction, and the cavity penetrates through two ends of the third direction. The support 2 is fixedly provided with support legs matched with part of cavities of the end plate 1, and the support legs are in interference fit with the cavities corresponding to the support legs. The support legs are inserted into the cavity and contact and press against the side wall of the cavity, so that the support 2 is fixedly connected with the end plate 1.

Alternatively, the connection between the support 2 and the end plate 1 may be fixed by using a fastener, or the support 2 and the end plate 1 may be fixed by clamping.

Referring to fig. 1, in the present embodiment, a recess 11 is formed on the end plate 1, and the support 2 is at least partially located in the recess 11.

Specifically, the groove 11 is arranged at one end of the end plate 1 facing the busbar in the third direction; the grooves 11 penetrate both ends of the end plate 1 in the first direction.

Inserting a portion of the holder 2 into the groove 11 enables the height of the holder 2 on the battery pack to be reduced so as to control the overall height of the battery pack.

In this embodiment, the depth of the groove 11 is less than half of the dimension of the end plate 1 in the depth direction of the groove 11. The depth of the grooves 11 in the third direction is too large, which significantly reduces the strength of the end plate 1, and therefore it is necessary to control the depth of the grooves 11 to reduce the influence on the strength of the end plate 1. Meanwhile, the smaller the dimension of the groove 11 in the second direction, the smaller the influence of the arrangement of the groove 11 on the strength of the end plate 1.

Referring to fig. 2, the battery pack further includes an output electrode 31, the holder 2 is fixedly connected to the output electrode 31, and the output electrode 21 is insulated from the end plate 1.

Specifically, the battery pack comprises a conductive bar 3, the conductive bar 3 is in conductive connection with a single battery in the battery pack, one end of the conductive bar 3 is in conductive connection with external equipment, and the end of the conductive bar in conductive connection with the external equipment is an output electrode 3.

In order to fix the output electrode 31 to the support 2, the support 2 is provided with a notch, the notch penetrates through two ends of the support 2 along the first direction, and the output electrode 31 is inserted into the notch. The support 2 separates the output electrode 31 from the end plate 1, and the output electrode 31 is insulated from the end plate 1.

Referring to fig. 2, the conducting bar 3 is a copper plate welded to the pole of the single battery, the copper plate has bending plates at both ends in the first direction, the bending plates are L-shaped plates, the vertical part of the bending plate is connected to the copper plate, the horizontal part is an output electrode 31, the battery pack has two conducting bars 3, and the two horizontal parts of the two bending plates of the two conducting bars 3 are a positive output electrode 31 and a negative output electrode 31 of the battery pack.

The vertical part of the bending plate can reduce the height of the output electrode 31 on the conducting bar 3 to reduce the connecting position of the output electrode 31 and the support 2, on one hand, the stability of the output electrode 31 connected with the support 2 is improved, and on the other hand, the whole height of the battery pack is convenient to reduce.

The size of the transverse part of the bent plate along the second direction is the width of the transverse part, and the width of the transverse part is changed in a stepped manner along the first direction; specifically, the width along the transverse part is gradually reduced along the vertical part step far away from the bending plate.

The width of the transverse part is relatively wider than that of the vertical part close to the bending plate, so that the connection strength between the transverse part and the vertical part can be improved, and the stability of the bending plate is kept. The width of the transverse part is relatively narrow when the vertical part of the bending plate is far away from, so that after the output electrode 31 is in conductive connection with external equipment, one end, far away from the vertical part, of the output electrode 31 is covered and connected, and the use safety is improved.

In the present embodiment, the position where the width of the lateral portion starts to decrease is located outside the groove 11, thereby increasing the gap between the lateral portion and the side wall of the groove 11.

Note that, since the output pole 31 is a rigid member, in the present embodiment, the size of the output pole 31 that moves closer to the end plate 1 due to its own weight is not considered when the mount 2 is not provided.

Referring to fig. 2, the minimum gap between the output electrode 31 and the side wall and the bottom wall of the recess 11 is larger than a set gap, which is an electrical gap between the output electrode 31 and the end plate 1.

The electrical gap is the shortest spatial distance measured between two conductive parts or between a conductive part and an equipment protective interface, and is determined according to a design manual.

Specifically, the minimum gap between the output electrode 31 and the side wall of the groove 11 is larger than the set gap; the minimum gap between the output pole 31 and the bottom wall of the recess 11 is larger than the set gap.

The following description sequentially describes the relationship between the output electrode 31 and the side wall of the recess 11 and the relationship between the output electrode 31 and the bottom wall of the recess 11.

In this embodiment, the minimum gap between the output electrode 31 and the sidewall of the groove 11 is larger than the set gap.

In the prior art, the minimum gap between the output pole 31 and the side wall of the groove 11 is smaller than the set gap, and the insulation between the output pole 31 and the end plate 1 can be maintained due to the existence of the support 2.

In this embodiment, when the battery pack has a fault and the support 2 is heated and melted, the gap between the output electrode 31 and the side wall of the groove 11 is only air, but because the minimum gap between the side wall of the groove 11 and the output electrode 31 is greater than the electrical gap between the output electrode 31 and the end plate 1, the insulation effect between the output electrode 31 and the end plate 1 can still be maintained, and the risk of short circuit in the battery pack due to the conductive connection between the output electrode 31 and the end plate 1 is reduced. During normal use, the support 2 is insulating, the support 2 supports the output electrode 31, and the support 2 separates the output electrode 31 from the end plate 1, so that the output electrode 31 and the end plate 1 can be prevented from conducting electricity.

Referring to fig. 2, as an alternative, the minimum gap between the output pole 31 and the side wall of the groove 11 is between 5mm and 10 mm.

Specifically, the minimum gap between the output pole 31 and the end plate 1 may be selected to be 6 mm. In other embodiments, the minimum gap between the output pole 31 and the end plate 1 may be selected to be any one of 5, 5.2, 7, 8, 8.5, 9, or 10 millimeters.

The gap between the output electrode 31 and the side wall of the groove 11 is mainly determined by three aspects, namely, on one hand, the size of the groove 11 along the second direction is increased under the condition that the width of the output electrode 31 is the same, so that the gap between the output electrode 31 and the side wall of the groove 11 can be increased, and on the other hand, the height of the output electrode 31 along the third direction can be increased, so that the output electrode 31 is positioned above the end plate 1; finally the width of the output pole 31 can be reduced.

The width of the output electrode 31 needs to satisfy the minimum width, so that the conductive connection between the output electrode 31 and the external device meets the design requirement. The higher the height of the output electrode 31 in the third direction, the higher the height of the battery pack as a whole, and in order to control the height of the battery pack, the increase in the height of the output electrode 31 should be avoided. Therefore, the present embodiment increases the minimum gap between the output electrode 31 and the sidewall of the recess 11 by adjusting the size of the recess 11.

In the present embodiment, the output pole 31 is located in the groove 11 so as to reduce the overall height of the battery pack.

In other embodiments, the output pole 31 may be located above the groove 11 along the third direction, or a part of the output pole 31 may be located in the groove 11 and another part may be located above the groove 11 along the third direction.

Referring to figure 3, as an alternative, the output pole 31 is located in the notch of the recess 11. In another embodiment, the output electrode 31 is located in the groove 11 and located in the middle region of the groove 11 along the third direction.

In this embodiment, the dimension of the notch of the groove 11 in the third direction is equal to the thickness of the output pole 31 in the third direction, and the upper surface of the output pole 31 is flush with the upper surface of the end plate 1. In the present embodiment, the notch of the groove 11 is indicated by a dashed line frame in the drawing and is located to show a dashed line, and the notch of the groove 11 is enlarged in the third direction so that the output electrode 31 is located within the dashed line frame.

In other embodiments, the dimension of the notch of the groove 11 in the third direction may be equal to two or three times the thickness of the output pole 31 in the third direction.

The output electrode 31 is located at the notch, facilitating the connection between the output electrode 31 and the holder 2, and reducing the influence on the height of the battery module.

Referring to fig. 2, the size of the notch of the groove 11 is larger than the size of the groove bottom; the minimum gap between the notch of the groove 11 and the output pole 31 is the minimum gap between the groove 11 and the output pole 31, and is larger than the set gap.

The part of the side wall of the groove 11 corresponding to the output pole 31 along the second direction increases the gap with the output pole 31, and the size of the groove bottom of the groove 11 along the second direction is relatively small, so that the size of the whole groove 11 is relatively small, and the influence of the arrangement of the groove 11 on the strength of the end plate 1 is reduced.

Referring to fig. 2, in the present embodiment, the groove 11 is an inverted trapezoidal groove. The inverted trapezoidal groove enables the overall change of the side wall of the groove 11 to be relatively uniform, and the size of the notch of the groove 11 can be increased under the condition that the bottom wall is relatively small.

Referring to fig. 4, as an alternative, the groove 11 is a square groove, and the notch of the square groove is provided with a rounded corner 12 to increase the gap between the notch of the square groove and the output pole 31.

Specifically, the radius of the fillet 12 is greater than half of the depth of the groove 11 in the third direction and less than the depth of the groove 11 in the third direction.

It should be noted that, when the groove 11 is in other shapes, a rounded corner 12 may be disposed between the side wall of the groove 11 and the top wall of the end plate 1, and the rounded corner 12 is a process rounded corner 12, which is set for realizing the machining and forming of the groove 11 or other design manual requirements. The notch of the square groove in the scheme is provided with the fillet 12, and the fillet 12 is designed for increasing the minimum clearance between the side wall of the groove 11 and the output pole 31 and enabling smooth transition between the side wall of the groove 11 and the top wall of the end plate 1.

Referring to fig. 1, as an alternative, a connecting member 4 is fixedly connected between the output pole 31 and the support 2.

Optionally, the connecting member 4 is a bolt, a round hole is formed in the output electrode 31, a threaded hole is formed in the support 2, and the connecting member 4 penetrates through the output electrode 31 to be in threaded connection with the support 2. Only one circular hole is provided in the output pole 31, and is located at the middle position in the width direction of the output pole 31.

The output electrode 31 is connected with the support 2 by the connecting piece 4, so that the connection is convenient, the output electrode 31 and the support 2 can be conveniently installed, the structural requirements on the output electrode 31 and the support 2 are relatively low, and the output electrode 31 and the support 2 can be conveniently molded.

In another embodiment, a snap-fit connection is used between the output pole 31 and the support 2. In another embodiment, the output pole 31 is fixed to the support 2 by means of a plug-in connection.

Referring to fig. 2, the gap between the output electrode 31 and the bottom wall of the recess 11 is larger than the set gap. In the present embodiment, the depth of the groove 11 in the third direction is greater than the thickness of the output electrode 31, and the output electrode 31 is located at the notch of the groove 11, so the gap between the output electrode 31 and the bottom wall of the groove 11 is greater than the set gap.

The output electrode 31 is connected with the support 2 by using the connecting piece 4, and when the connecting piece 4 is a conductor, the gap between the connecting piece 4 and the bottom wall of the groove 11 is larger than a second set gap, and the second set gap is an electric gap between the connecting piece 4 and the end plate 1. The gap between the output electrode 31 and the bottom wall of the groove 11 and the gap between the connecting piece 4 and the bottom wall of the groove 11 are required to meet the requirements at the same time.

Specifically, the connecting piece 4 is a metal bolt, the metal bolt is in threaded connection with the support 2, and a gap between the metal bolt and the bottom wall of the groove 11 along the third direction is larger than a second set gap.

The metal connecting piece 4 has a higher structural strength than a plastic piece, and can keep stable connection between the output electrode 31 and the support 2.

Referring to fig. 4, as an alternative, the connecting member 4 includes a connecting bolt and a connecting nut, both of which are metal members. The connecting threaded sleeve is fixedly connected with the support 2, and the connecting bolt penetrates through a round hole in the output electrode 31 to be in threaded connection with the connecting threaded sleeve.

It should be added that the minimum clearance of the connecting screw sleeve and the connecting bolt to the side wall of the groove 11 is larger than the minimum clearance of the output pole 31 to the side wall of the groove 11.

The distance from the connecting piece 4 to the bottom wall of the groove 11 is the distance from the connecting threaded sleeve to the bottom wall of the groove 11, and the distance from the connecting threaded sleeve to the bottom wall of the groove 11 is smaller than a second set gap.

When the support 2 is heated and melted, the gap between the output electrode 31 and the bottom wall of the groove 11 is larger than a set gap, and the gap between the connecting thread insert and the bottom wall of the groove 11 and the gap between the connecting thread insert and the side wall of the groove 11 are larger than a second set gap, so that the output electrode 31 and the end plate 1 can still be insulated.

Referring to fig. 4, as an alternative, the connecting member 4 is provided along the depth direction of the groove 11; the bottom wall of the groove 11 is provided with a yielding notch 13 corresponding to the connecting piece 4 so as to increase the clearance between the connecting piece 4 and the bottom wall of the groove 11.

Specifically, the abdicating notch 13 is an inverted trapezoidal groove formed in the bottom wall of the groove 11, and in another embodiment, the abdicating notch 13 may also be an arc-shaped groove or a triangular groove.

The position of the abdicating notch 13 and the connecting piece 4 along the third direction corresponds, so that the depth of the local area corresponding to the groove 11 and the connecting piece 4 is increased, the whole depth of the groove 11 is prevented from being increased, the size of the groove 11 is reduced, and the reduction of the overall strength of the end plate 1 caused by the arrangement of the groove 11 is reduced.

In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on operational states of the present application, and are only used for convenience in describing and simplifying the present application, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

In the description of the present application, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise explicitly stated or limited. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The present application has been described above with reference to preferred embodiments, but these embodiments are merely exemplary and merely illustrative. On the basis of the above, the present application can be subjected to various substitutions and improvements, and the substitutions and the improvements are all within the protection scope of the present application.

Claims

1. A battery pack is characterized by comprising an end plate, a support and an output pole;

the end plate is provided with a groove, and at least part of the support is positioned in the groove and is fixedly connected with the end plate;

the support is fixedly connected with the output electrode to support the output electrode and is insulated from the end plate;

the minimum clearance between the output pole and the side wall and the bottom wall of the groove is larger than a set clearance, and the set clearance is an electric clearance between the output pole and the end plate.

2. The battery of claim 1, wherein said output pole is located within said recess.

3. The battery of claim 2, wherein the output pole is located in a notch of the groove;

the size of the notch of the groove is larger than the size of the groove bottom of the groove, and the minimum gap between the notch of the groove and the output pole is the minimum gap between the groove and the output pole and is larger than the set gap.

4. The battery pack of claim 3, wherein the groove is an inverted trapezoidal groove.

5. The battery according to claim 3, wherein the groove is a square groove, and the notch of the square groove is rounded to increase a gap between the notch of the square groove and the output electrode.

6. The battery pack according to any one of claims 1 to 5, wherein a connecting member is fixedly connected between the output pole and the support.

7. The battery according to claim 6, wherein the connector is a conductor, the connector is spaced apart from the end plate, and a gap between the connector and the side wall and the bottom wall of the groove is larger than a second set gap, which is an electrical gap between the connector and the end plate.

8. The battery pack according to claim 7, wherein the connection member is provided in a depth direction of the groove;

the recess diapire be provided with the breach of stepping down that the connecting piece corresponds, in order to increase the connecting piece with the clearance of recess diapire.

9. The battery of claim 1, wherein the depth of the groove is less than half the dimension of the end plate in the direction of the depth of the groove.

10. The battery of claim 1, wherein the minimum gap between the output pole and the groove sidewall is between 5mm and 10 mm.