CN217215007U

CN217215007U - Power battery pack

Info

Publication number: CN217215007U
Application number: CN202220511148.1U
Authority: CN
Inventors: 王强; 王杭挺; 刘安龙
Original assignee: Guangzhou Xiaopeng Motors Technology Co Ltd
Current assignee: Guangzhou Xiaopeng Motors Technology Co Ltd
Priority date: 2022-03-08
Filing date: 2022-03-08
Publication date: 2022-08-16
Anticipated expiration: 2032-03-08

Abstract

An embodiment of the utility model provides a power battery package, power battery package include box, a plurality of battery module and high-voltage power-off device, and in the box was located to a plurality of battery modules, high-voltage power-off device included the outage electrically conductive piece, and outage electrically conductive piece detachably is fixed, and electric connection in the first connection copper bar of two battery modules, seted up on the box towards the open installing port in the box outside, and outage electrically conductive piece holds in the installing port. In the power battery pack provided by the embodiment of the utility model, the two battery modules are detachably connected through the power-off conductive piece, so that the safety of the power battery pack can be ensured during the assembly and maintenance of the battery pack; outage electrically conductive piece is located the installing port of box, can not increase the space size of power battery package, therefore can not influence passenger's the experience of taking, also can conveniently expose outage electrically conductive piece simultaneously and carry out the dismouting to it.

Description

Power battery pack

Technical Field

The utility model relates to a battery technology field especially relates to a power battery package.

Background

With the development of society and the increasing importance of people on environmental protection, electric automobiles are more and more widely applied. The lithium ion battery is generally used for a power battery of an electric automobile and has the characteristics of high energy density and large single energy. When a power battery high-voltage system is in fault and needs to be maintained, if the high voltage at the two ends of the battery pack is touched carelessly, the human body or equipment can be damaged. In order to ensure the safety of people and equipment, a high-voltage power-off device is required to be arranged to disconnect the power supply of a battery high-voltage system.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a higher, the less power battery package of volume of security.

The utility model discloses an aspect provides a power battery package, including box, a plurality of battery module and high-voltage power-off device, it is a plurality of the battery module is located in the box, high-voltage power-off device is including the outage electrically conductive piece, outage electrically conductive piece detachably is fixed, and electric connection is adjacent in two the first connection copper bar of battery module, seted up the court on the box the open installing port in the box outside, outage electrically conductive piece hold in the installing port.

In the power battery pack provided by the embodiment of the utility model, two battery modules are detachably connected through the power-off conductive piece, when the battery pack is assembled, the power-off conductive piece can be installed at last, no live working in the whole operation process is ensured, the power-off conductive piece can be removed outside the vehicle for power-off during maintenance, no live working is realized, and the safety of the power battery pack is ensured; outage electrically conductive piece is located the installing port of box, can not form higher boss at the box lateral wall, can not increase the space size of power battery package, therefore can not influence passenger's the experience of taking, also can conveniently expose outage electrically conductive piece simultaneously and carry out the dismouting to it.

Drawings

FIG. 1 is a schematic circuit diagram of a power battery system.

FIG. 2 is a schematic circuit diagram of another power battery system.

FIG. 3 is a schematic structural diagram of the power cell system shown in FIG. 2.

Fig. 4 is a schematic structural diagram of a power battery pack according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of the power battery pack shown in fig. 4 with a cover removed.

Fig. 6 is an exploded view of the power battery pack of fig. 4 with the cover removed.

Fig. 7 is a partial enlarged view of VII in fig. 6.

Fig. 8 is a schematic plan view of an end face of the power battery pack of fig. 4.

Fig. 9 is an enlarged view of a portion of fig. 8 at IX.

Fig. 10 is a schematic structural view of the first connecting copper bar of the power battery pack shown in fig. 4.

Fig. 11 is a schematic circuit diagram of the power battery pack shown in fig. 4.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the intended purpose of the present invention, the following detailed description of the embodiments, structures, features and effects of the present invention will be made with reference to the accompanying drawings and examples.

In the related art, referring to fig. 1, a power battery system includes a first battery module 81, a second battery module 82, a positive contactor 83, a negative contactor 84, a fuse 85, a battery output positive pole 86, and a battery output negative pole 87. In normal operation, the positive contactor 83 and the negative contactor 84 are closed, and the battery output positive pole 86 and the battery output negative pole 87 respectively have high voltage. When it is necessary to make the battery output positive electrode 86 and the battery output negative electrode 87 uncharged, the positive contactor 83 and the negative contactor 84 need to be opened. However, the positive contactor 83 and the negative contactor 84 are energized by the low voltage control terminal to close the high voltage terminal. If the low-voltage control end fails, the high-voltage end is always in a closed state, so that the battery output positive electrode 86 and the battery output negative electrode 87 are always in high-voltage state, potential safety hazards are caused, and the power-off protection effect cannot be achieved; even if the positive contactor 83 and the negative contactor 84 are opened, the first battery module 81 and the positive contactor 83 and the second battery module 82 and the negative contactor 84 are still charged, and there is a risk of electric shock.

Referring to fig. 2 and 3, another power battery system includes a first battery module 91, a second battery module 92, a positive contactor 93, a negative contactor 94, a fuse 95, a battery output positive electrode 96, a battery output negative electrode 97, and a maintenance switch 98. Pulling out the maintenance switch 98 can completely cut off the power of the battery output positive electrode 96 and the battery output negative electrode 97, and can also completely cut off the power of the inner sides of the positive electrode contactor 93 and the negative electrode contactor 94. However, since the power battery is a heavy current charging and discharging component, the maintenance switch 98 needs a strong current carrying capacity, and the maintenance switch is structurally composed of a plug and a socket. Therefore, the maintenance switch 98 protrudes out of the power battery, and occupies a large space; and the service switch 98 is usually snap-fitted by a handle, with the risk of poor contact and safety risks.

Fig. 4 is a schematic structural diagram of a power battery pack according to an embodiment of the present invention; fig. 5 is a schematic structural view of the power battery pack shown in fig. 4 with a cover removed.

Referring to fig. 4 and 5, in the present embodiment, the power battery pack includes a box 11, a plurality of battery modules 13, a high-voltage power-off device 15, and a box cover 17, wherein the plurality of battery modules 13 are disposed in the box 11, the box cover 17 is disposed on the box 11 to shield the battery modules 13, and two adjacent battery modules 13 respectively include a first connecting copper bar 132. Specifically, the plurality of battery modules 13 refers to two or more battery modules 13.

FIG. 6 is a partially exploded schematic view of the power battery pack of FIG. 4; fig. 7 is a partial enlarged view of VII in fig. 6. Referring to fig. 6 and 7, the high voltage power cutoff device 15 includes power cutoff conductive members 151, and the power cutoff conductive members 151 are detachably fixed and electrically connected to the first connecting copper bars 132 of the two battery modules 13, respectively. Open mounting port 112 towards the box 11 outside has been seted up on the box 11, and outage electrically conductive piece 151 holds in mounting port 112, and the first connecting copper bar 132 of battery module 13 extends to the position that corresponds mounting port 112.

In the power battery pack of the embodiment, the power-off conductive member 151 is detachably connected with the two battery modules 13, when the battery pack is assembled, the power-off conductive member 151 can be installed at last, so that no live-line operation in the whole operation process is ensured, and the power-off conductive member 151 can be detached outside a vehicle for power-off in maintenance so as to realize no live-line operation and ensure the safety of the power battery pack; outage electrically conductive piece 151 is located the installing port 112 of box 11, can not form higher boss at box 11 lateral wall, can not increase the space size of power battery package, therefore can not influence passenger's the experience of taking, also can conveniently expose outage electrically conductive piece 151 simultaneously and carry out the dismouting to it.

In this embodiment, the power-off conductive member 151 is a conductive plate with a smaller thickness, so as to further avoid forming a higher boss on the outer sidewall of the case 11.

In this embodiment, the high voltage power-off device 15 further includes a first fastening member 155, the power-off conductive members 151 are detachably fixed and electrically connected to the first connecting copper bars 132 of the two battery modules 13 respectively by the first fastening member 155, that is, the power-off conductive members 151 are fixed to the first connecting copper bars 132 of the two battery modules 13 respectively by the first fastening member 155, and the power-off conductive members 151 are electrically connected to the first connecting copper bars 132 of the two battery modules 13 respectively.

Specifically, the box 11 includes a body 113 and a base 114 fixedly connected to the body 113, and the base 114 is located in an opening formed on a side wall of the body 113. The first fastening member 155 is a bolt, two openings 1512 are formed in the power-off conductive member 151, a through hole is formed in the first connecting copper bar 132, and the first fastening member 155 penetrates through the openings 1512 and the through hole to be screwed with the base 114. Thus, after the bolt is locked, the first connecting copper bar 132 is tightly attached to the power-off conductive member 151, so that good electrical connection is realized. The outage conductive piece 151 is connected with the first connecting copper bar 132 through the bolts, reliability is high, high-voltage interlocking monitoring is not needed, reliable connection can be achieved without extra devices such as high-voltage interlocking, and the outage conductive piece is simple in structure and low in cost. It is understood that the first fastener 155 may be detachably connected to the base 114 by snapping, etc.

In this embodiment, the base 114 protrudes from the outer sidewall of the body 113 to form a boss. The height of 113 lateral walls of boss protrusion body is less, can not form higher boss at box 11 lateral wall, can not increase the space size of power battery package, can not influence passenger's the experience of taking. It can be understood that the base 114 can also be lower than the outer side wall of the body 113, and a groove is formed at the outer side wall of the box 11, and a side surface of the protective cover 153 is attached to the bottom of the groove, so that a higher boss can be better prevented from being formed at the outer side wall of the box 11, and the space size of the power battery pack can not be increased.

In this embodiment, the high voltage power cutoff device 15 further includes a protective cover 153 and a second fastener 157. The protective cover 153 covers the outer side of the power cutoff conductive member 151 and shields the mounting hole 112, and the protective cover 153 is detachably and fixedly coupled to the cabinet 11 by a second fastening member 157. Specifically, one side of the protective cover 153 is attached to a boss formed on the base 114. It is understood that the cover 153 may be removably secured to the base 114 by the second fastener 157 and may also be removably secured to the body 113 by the second fastener 57.

Power-off conductor 151 may be shielded from exposure by installing a protective cover 153. FIG. 8 is a schematic plan view of an end of the power cell pack of FIG. 4; fig. 9 is an enlarged view of a portion of fig. 8 at IX. Referring to fig. 8 and 9, power-off conductive member 151 may be exposed by removing protective cover 153 to operate power-off conductive member 151 outside the vehicle.

Specifically, the protective cover 153 is a sheet-shaped body with a small thickness, so that a high boss is not formed on the outer side wall of the box body 11, the space size of the power battery pack is not increased, and the riding experience of passengers is not influenced. When the base 114 is lower than the outer side wall of the body 113 and the groove is formed at the outer side wall of the body 113, the protective cover 153 is accommodated in the groove, and a side surface of the protective cover 153 is attached to the bottom of the groove, so that the formation of a boss at the outer side wall of the box body 11 can be completely avoided, and the space size of the power battery pack can not be increased.

Specifically, referring to fig. 6 and 7 again, the second fastening member 157 is a bolt, the protective cover 153 has a plurality of through holes 1532, the base 114 has a plurality of connecting holes 118, and the second fastening member 157 passes through the through holes 1532 and is screwed with the connecting holes 118 of the base 114.

In this embodiment, the high voltage power cutoff device 15 further includes a sealing member 159, and the sealing member 159 is disposed between the box 11 and the protecting cover 153 and respectively abuts against the box 11 and the protecting cover 153 to achieve a good sealing. Specifically, the housing 11 is formed with a receiving groove 116 around the periphery of the mounting opening 112, and the sealing member 159 is disposed in the receiving groove 116. More specifically, the receiving groove 116 opens on the base 114.

In this embodiment, the conductive cut-off member 151 is disposed at the middle position of the plurality of battery modules 13. Therefore, when the power-off conductive piece 151 is not installed or the power-off conductive piece 151 is detached, the high-voltage loop of the power battery pack can be cut off from the center, and the safety protection range is wider.

Specifically, the cut-off conductive member 151 is disposed at the middle position of the plurality of battery modules 13, so that the high-voltage circuit of the power battery pack can be cut off from the middle position. For example, the battery modules 13 include a first battery module 13a and a second battery module 13b, the power-off conductive member 151 is connected to the first battery module 13a through one first connecting copper bar 132 and connected to the second battery module 13b through the other first connecting copper bar 132, and when the power battery pack includes an even number of battery modules 13, the number of the battery modules 13 on both sides of the first battery module 13a and the second battery module 13b is the same (the number of the battery modules 13 between the high-voltage power-off device 15 and the output positive pole of the power battery pack is the same as the number of the battery modules 13 between the high-voltage power-off device 15 and the output negative pole of the power battery pack). It can be understood that the cut-off conductive member 151 is disposed at the middle position of the plurality of battery modules 13. It is understood that the number of the battery modules 13 may also be odd, and when the power battery pack includes an odd number of battery modules 13, the number of the battery modules 13 on both sides of the first battery module 13a and the second battery module 13b is different by one, and the high-voltage circuit of the power battery pack is cut off from the position closest to the center, not from the center. Of course, the conductive cutoff member 151 may be provided at a position slightly shifted from the center of the plurality of battery modules 13.

In this embodiment, the power battery pack further includes a second connecting copper bar 21, where the second connecting copper bar 21 is directly electrically connected to two adjacent battery modules 13 that are not connected to the power-off conductive member 151, or connects one battery module 13 that is not connected to the power-off conductive member 151 with one battery module 13 that is connected to the power-off conductive member 151.

Fig. 10 is a schematic structural view of the first connecting copper bar of the power battery pack shown in fig. 4. In this embodiment, referring to fig. 10, the end of the first connecting copper bar 132 is a sheet 1322, and the power-off conductive member 151 is attached to the sheet at the end of the first connecting copper bar 132, so as to electrically connect the power-off conductive member 151 and the first connecting copper bar 132.

In this embodiment, the first connecting copper bar 132 includes a lead portion 1324 connected to the battery module 13 and a connecting portion 1326 connected between the lead portion 1324 and the sheet-like member 1322, and the connecting portion 1326 is bent with respect to both the lead portion 1324 and the sheet-like member 1322. The lead 1324 is connected to the sheet 1322 through the connection portion 1326, so that the high voltage power cutoff device 15 can be disposed at a proper position of the case 11, and the installation of the high voltage power cutoff device 15 is facilitated.

Fig. 11 is a schematic circuit diagram of the power battery pack of the present embodiment. Specifically, the power battery pack further comprises a positive electrode contactor 25, a negative electrode contactor 26, a battery pack output positive electrode 29 and a battery pack output negative electrode 31, wherein the battery pack output positive electrode 29, the positive electrode contactor 25, the first battery module 13a, the power-off conductive piece 151 of the high-voltage power-off device 15, the second battery module 13b, the negative electrode contactor 26 and the battery pack output negative electrode 31 are sequentially connected in series.

The above is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the above preferred embodiments, but the present invention is not limited to the above embodiments, and any skilled person in the art can make some changes or modifications to equivalent embodiments without departing from the technical scope of the present invention, but all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still belong to the technical scope of the present invention.

Claims

1. The utility model provides a power battery package, its characterized in that, power battery package includes box (11), a plurality of battery module (13) and high-voltage power-off device (15), and is a plurality of battery module (13) are located in box (11), high-voltage power-off device (15) are including the electrically conductive piece (151) of outage, the electrically conductive piece (151) detachably of outage is fixed, and electric connection is two adjacent the first connecting copper bar (132) of battery module (13), seted up on box (11) court open mounting port (112) in box (11) outside, the electrically conductive piece (151) of outage hold in mounting port (112).

2. The power battery pack as claimed in claim 1, wherein the power-off conductive member 151 is disposed at a middle position of the plurality of battery modules (13).

3. The power battery pack according to claim 1, wherein the plurality of battery modules (13) includes a first battery module (13a) and a second battery module (13b), and the power-off conductive member (151) is connected to the first battery module (13a) through one of the first connecting copper bars (132) and connected to the second battery module (13b) through the other first connecting copper bar (132).

4. The power battery pack according to claim 3, further comprising a positive electrode contactor (25), a negative electrode contactor (26), a battery pack output positive electrode (29), and a battery pack output negative electrode (31), wherein the battery pack output positive electrode (29), the positive electrode contactor (25), the first battery module (13a), the high voltage power cut-off device (15), the second battery module (13b), the negative electrode contactor (26), and the battery pack output negative electrode (31) are connected in series in sequence.

5. The power battery pack of claim 1, wherein the power-off conductive member (151) is a conductive sheet.

6. The power battery pack as claimed in claim 1, wherein the end of the first connecting copper bar (132) is a plate-shaped body (1322), and the power-off conductive member (151) is attached to the plate-shaped body (1322) at the end of the first connecting copper bar (132).

7. The power battery pack according to claim 6, wherein the case (11) comprises a body (113) and a base (114) fixedly connected to the body (113), the base (114) is located in an opening formed in a side wall of the body (113),

the high-voltage power-off device (15) further comprises a first fastener (155), an opening hole (1512) is formed in the power-off conductive piece (151), a through hole is formed in the first connecting copper bar (132), the first fastener (155) penetrates through the opening hole (1512) and the through hole to be connected with the base (114), and the platy body (1322) of the first connecting copper bar (132) is tightly attached to the power-off conductive piece (151).

8. The power battery pack according to claim 6, wherein the first connecting copper bar (132) further includes a lead-out portion (1324) connected to the battery module (13) and a connecting portion (1326) connected between the lead-out portion (1324) and the sheet-shaped body (1322), and the connecting portion (1326) is bent with respect to both the lead-out portion (1324) and the sheet-shaped body (1322).

9. The power battery pack according to claim 7, wherein the high voltage power cut-off device (15) further comprises a protective cover (153) and a second fastening member (157), the protective cover (153) covers the power cut-off conductive member (151) and shields the mounting opening (112), and the protective cover (153) is detachably and fixedly connected to the case (11) by the second fastening member (157).

10. The power battery pack as claimed in claim 9, wherein the base (114) protrudes from the outer side wall of the body (113) to form a boss, and one side surface of the protective cover (153) is attached to the boss; or the base (114) is lower than the body (113), so that a groove is formed on the outer side wall of the box body (11), the protective cover (153) is accommodated in the groove, and one side surface of the protective cover (153) is attached to the bottom of the groove.