CN215834666U

CN215834666U - Power battery module

Info

Publication number: CN215834666U
Application number: CN202122128851.2U
Authority: CN
Inventors: 李伟
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2021-09-03
Filing date: 2021-09-03
Publication date: 2022-02-15
Anticipated expiration: 2031-09-03

Abstract

The utility model relates to a power battery module, comprising: a housing; the plurality of electric core groups are arranged in the shell side by side along a first direction, the polarity of the electrodes of the electric core groups is alternately arranged along the first direction, and every two adjacent electrodes with the same polarity of the electric core groups are arranged in the same direction; and the busbar is arranged in the shell and used for being connected with the electric core group in series and leading out a positive pole column and a negative pole column, and the positive pole column and the negative pole column are positioned on the first side of the shell. Above-mentioned power battery module, positive negative utmost point post all are located first side, and the connecting wire of the positive negative utmost point post of connecting a plurality of power battery modules also all is located first side, is convenient for a plurality of power battery modules series connection wiring, and can avoid making the crisscross winding condition of connecting wire because of positive negative utmost point post is located different homonymies.

Description

Power battery module

Technical Field

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

Background

At present, the number of power battery modules carried by a vehicle body of an electric vehicle is more and more, the positive pole and the negative pole of each module are generally respectively positioned on two sides of the module, and a connecting line for connecting each module is connected from one side of the module to the other side in a cross-over mode, so that the length of the connecting line is longer, the connecting line is wound in a staggered mode, and heat dissipation is not facilitated.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a power battery module for solving the problem that the connecting wires connecting the modules are long and are wound in a staggered manner.

A power cell module, comprising:

a housing;

the plurality of electric core groups are arranged in the shell side by side along a first direction, the polarity of the electrodes of the electric core groups is alternately arranged along the first direction, and every two adjacent electrodes with the same polarity of the electric core groups are arranged in the same direction; and

the busbar is arranged in the shell and used for being connected in series with the electric core group and leading out a positive pole column and a negative pole column, and the positive pole column and the negative pole column are located on the first side of the shell.

Above-mentioned power battery module, positive negative utmost point post all are located first side, and the connecting wire of the positive negative utmost point post of connecting a plurality of power battery modules also all is located first side, is convenient for a plurality of power battery modules series connection wiring, and can avoid making the crisscross winding condition of connecting wire because of positive negative utmost point post is located different homonymies.

In one embodiment, the bus bar comprises a first bus bar and a second bus bar, the first bus bar is connected in series with the electric core groups distributed from head to tail along the first direction, and the second bus bar is used for respectively connecting two adjacent electric core groups at tail of the first direction so as to lead out the positive pole column and the negative pole column.

In one embodiment, the first bus bar and the second bus bar are arranged on the same side of all the electric core groups in a laminated structure, and the first bus bar and/or the second bus bar at different layers are at least partially overlapped.

In one embodiment, the first bus bar and the second bus bar are arranged in a same plane, and the first bus bar and the second bus bar are arranged in a same plane.

In one embodiment, the first bus bar includes a main bus bar connected to the electrodes having different polarities on the same side, and a sub bus bar connected to the electrodes having different polarities on the opposite side.

In one embodiment, the main bus bar is U-shaped and/or the secondary bus bar is Z-shaped.

In one embodiment, the first bus bar and the second bus bar have bent portions folded along one side.

In one embodiment, the second bus bar comprises a positive bus bar and a negative bus bar, the positive bus bar is connected with the positive electrode of one of the cell groups, and the negative bus bar is connected with the negative electrode of the other cell group.

In one embodiment, the electric power connector further comprises a circuit board with a connecting terminal, wherein the circuit board is electrically connected with the electric core group, and the connecting terminal is located on a second side of the shell, which is opposite to the first side.

In one embodiment, a cavity is arranged in the shell to accommodate the electric core group, and a second insulating layer is arranged between the periphery of the electric core group and the inner wall of the cavity.

Drawings

Fig. 1 is a schematic diagram of a power battery module according to an embodiment;

fig. 2 is an exploded view of the power battery module shown in fig. 1;

fig. 3 is a top view of the power battery module shown in fig. 1;

fig. 4 is a top view of a bus bar in the power battery module shown in fig. 1;

fig. 5 is an exploded view of the busbar shown in fig. 4;

fig. 6 is a schematic diagram of the main bus bar in the power battery module shown in fig. 1.

Reference numerals:

100. a housing; 101. a first side; 102. a second side; 103. a third side; 104. a fourth side; 110. a cover plate; 120. a side plate; 130. an end plate;

200. the electric core group; 201. an electric core; 210. a first electric core group; 220. a second electric core group; 230. a third electric core group; 240. a fourth electric core group; 250. a fifth electric core group; 260. a sixth electric core group; 270. a seventh electric core group; 280. an eighth electric core group;

300. a bus bar; 301. a positive post; 302. a negative pole post; 310. a first bus bar; 330. a main bus bar; 330a, a first body; 330b, a first connecting part; 330c, a first bending part; 331. a first main bus bar; 332. a second main bus bar; 333. a third main bus bar; 334. a fourth main bus bar; 335. a fifth main bus bar; 336. a sixth main bus bar; 340. a secondary bus bar; 320. a second bus bar; 321. a positive bus bar; 322. a negative bus bar; 323. a first extension portion; 324. a second protruding portion; 400. a first insulating layer; 500. a circuit board; 510. a connection terminal; 600. a second insulating layer.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1, the power battery module in one embodiment includes a housing 100, a plurality of electric core groups 200 and a bus bar 300, wherein the plurality of electric core groups 200 and the bus bar 300 are disposed in the housing 100. Each electric core group 200 is used for supplying power, the busbar 300 is used for connecting each electric core group 200 in series and leading out a positive pole column 301 and a negative pole column 302, and the positive pole column 301 and the negative pole column 302 are both positioned on the first side 101 of the shell 100.

Wherein, the electric core groups 200 are arranged side by side along a first direction (i.e. the X direction shown in fig. 1), the polarities of the electrodes of the electric core groups 200 are alternately arranged along the first direction, and the electrodes of the same polarity of every two adjacent electric core groups 200 are arranged in the same direction.

It can be understood that, in practical use, a plurality of power battery modules arranged side by side in a second direction (i.e., the Y direction shown in fig. 1) perpendicular to the first direction need to be connected in series.

Through the arrangement, the positive and negative poles 302 of the power battery module are both positioned on the first side 101, and the connecting wires for connecting the positive and negative poles 302 of the plurality of power battery modules are also positioned on the first side 101, so that the plurality of power battery modules can be conveniently connected in series for wiring, and the condition that the connecting wires are wound in a staggered manner because the positive and negative poles 302 are positioned on different sides can be avoided.

It should be noted that, since the busbar 300 needs to have electrical conductivity, the busbar 300 may be made of a material with good electrical conductivity, such as aluminum and copper.

In a specific embodiment, each battery cell pack 200 includes a plurality of battery cells 201, and the battery cells 201 are connected in parallel and arranged side by side along a first direction.

For example, as shown in fig. 3, the number of the cell packs 200 is eight, and each cell pack 200 includes three cells 201, so as to form a power battery module with three parallel strings and eight strings.

With reference to fig. 3, the electrodes (positive and negative electrodes) of the first and second

electric core groups

210 and 220 are arranged in the same direction, the electrodes of the third and fourth

electric core groups

230 and 240 are in the same direction and are opposite to the electrodes of the first and second groups (the first and second electric core groups 210 and 220), the electrodes of the fifth and sixth

electric core groups

250 and 260 are in the same direction and are opposite to the electrodes of the first and second groups (the third and fourth electric core groups 230 and 240), and the electrodes of the seventh and eighth

electric core groups

270 and 280 are in the same direction and are opposite to the electrodes of the first and second groups (the fifth and sixth electric core groups 250 and 260). In this embodiment, after being connected in series with each electric core pack 200 via the busbar 300, the positive post 301 and the negative post 302 are both located on the first side 101 of the case 100.

In the embodiment shown in fig. 4, the bus bar 300 includes a first bus bar 310 and a second bus bar 320, the first bus bar 310 is used for serially connecting the electric core groups 200 distributed from head to tail along a first direction, and the second bus bar 320 is used for respectively connecting two adjacent electric core groups 200 at tail of the first direction to lead out the positive pole column 301 and the negative pole column 302.

Specifically, as shown in fig. 2 and 5, the electric core groups 200 are arranged side by side along a first direction, and the electrodes of the electric core groups 200 are located at the top side. The first bus bars 310 and the second bus bars 320 are stacked on one side (i.e., the top side) of the entire electric core assembly 200, the first bus bars 310 and/or the second bus bars 320 in different layers are at least partially overlapped, and the first bus bars 310 and/or the second bus bars in the same layer are not overlapped with each other.

By arranging the bus bars in a stacked structure, the space can be effectively utilized, and the bus bars are conveniently connected with the corresponding electric core group 200.

Further, referring to fig. 5, the power battery module further includes a first insulating layer 400, and the first insulating layer 400 is sandwiched between the partially overlapped first bus bar 310 and/or the partially overlapped second bus bar 320 to insulate and prevent short circuit.

In one embodiment, the first insulating layer 400 is made of polyethylene terephthalate, and has good insulating effect and high voltage resistance. In other embodiments, the first insulating layer 400 may be made of other insulating materials.

As shown in fig. 4, the second bus bar 320 includes a positive bus plate 321 and a negative bus plate 322, the positive bus plate 321 is connected to the positive electrode of one cell assembly 200, and the negative bus plate 322 is connected to the negative electrode of the other cell assembly 200.

In one embodiment, as shown in fig. 5, the positive bus plate 321 has a first protrusion 323 protruding outside the battery pack 200 to form the positive post 301, and the negative bus plate 322 has a second protrusion 324 protruding outside the battery pack 200 to form the negative post 302.

In the embodiment shown in fig. 4, the first bus bar 310 includes a main bus plate 330 and a sub bus plate 340, the main bus plate 330 is connected to the electrodes with different polarities on the same side, and the sub bus plate 340 is connected to the electrodes with different polarities on the opposite side.

Specifically, as shown in fig. 3, the number of the electric core groups 200 is eight, the number of the main bus plates 330 is six, and the number of the sub bus plates 340 is one. The main bus plate 330 is connected to the electrodes located on the third side 103 of the case 100, and the sub bus plate 340 is connected to the electrodes located on the third side 103 and the fourth side 104 of the case 100, respectively.

For example, referring to fig. 4 and 3, the first main bus bar 331 connects the negative electrode of the first core group 200 and the positive electrode of the third core group 200, the second main bus bar 332 connects the negative electrode of the third core group 200 and the positive electrode of the fifth core group 200, the third main bus bar 333 connects the negative electrode of the fifth core group 200 and the positive electrode of the seventh core group 200, the fourth main bus bar 334 connects the negative electrode of the eighth core group 200 and the positive electrode of the sixth core group 200, the fifth main bus bar 335 connects the negative electrode of the sixth core group 200 and the positive electrode of the fourth core group 200, the sixth main bus bar 336 connects the negative electrode of the fourth core group 200 and the positive electrode of the second core group 200, and the sub bus bar 340 connects the negative electrode of the second core group 200 and the positive electrode of the first core group 200. The positive bus plate 321 is connected with the positive electrode of the eighth core pack 200 and leads out the positive post 301, and the negative bus plate 322 is connected with the negative electrode of the seventh core pack 200 and leads out the negative post 302.

Referring to fig. 4 and 5, the second main bus plate 332, the fifth main bus plate 335, the sub-bus plate 340, the positive bus plate 321, and the negative bus plate 322 are located on a first layer, the first main bus plate 331, the third main bus plate 333, the fourth main bus plate 334, and the sixth main bus plate 336 are located on a second layer, and the first layer and the second layer are stacked. The second main bus plate 332 partially overlaps the sixth main bus plate 336, the fifth main bus plate 335 partially overlaps the third main bus plate 333, the sub bus plate 340 partially overlaps the first main bus plate 331, and the negative bus plate 322 partially overlaps the fourth main bus plate 334, each of which overlaps a first insulating layer 400.

In the embodiment shown in fig. 4, the main bus bar 330 has a U-shape, and/or the sub bus bar 340 has a Z-shape, so that the bus bar 300 has a compact structure and is easily connected to each cell pack 200. In other embodiments, the main bus bar 330 and the auxiliary bus bar 340 may have other shapes, and the number of the main bus bar 330 and the auxiliary bus bar 340 may be adjusted according to actual requirements, which is not specifically limited herein.

Further, as shown in fig. 6, the main bus bar 330 and the sub bus bar 340 have bent portions folded along one side, so that the bus bar 300 can better flow over and dissipate heat.

Specifically, referring to fig. 6, the main bus bar 330 includes a first main body 330a and a first connecting portion 330b, the first main body 330a and the first connecting portion 330b are fixedly connected and located on different horizontal planes, and the first main body 330a is folded along a middle portion to form a first bending portion 330 c.

It can be understood that when the main bus plate 330 is assembled with the cell group 200, the first main body 330a abuts on the region where no electrode is disposed on the top side of the cell group 200, and the first connection portion 330b connects the electrodes on the top side of the cell group 200. By arranging the first bending portion 330c, the thickness of the first main body 330a is greater than that of the first connecting portion 330b, so that the connection with the electrode is not affected, the space can be fully utilized, and the overcurrent heat dissipation capability of the first connecting portion 330b is enhanced.

In this embodiment, the secondary bus bar 340 and the primary bus bar 330 have the same structure except for their different shapes, and are not described herein again.

Referring to fig. 2, the power battery module further includes a circuit board 500, and the circuit board 500 is electrically connected to the electric core assembly 200. The circuit board 500 has a connection terminal 510, and the connection terminal 510 is located on a second side 102 of the housing 100 opposite to the first side 101.

Specifically, the circuit board 500 is disposed over the second main bus plate 332, the fifth main bus plate 335, the sub bus plate 340, the positive bus plate 321, and the negative bus plate 322 on the first layer, and the first insulating layer 400 is interposed between the circuit board 500 and each bus plate.

It is understood that the circuit board 500 is used for controlling and testing the electric core pack 200, and the connection terminal 510 of the circuit board 500 is connected to other low voltage devices. In the power battery module, the voltage of the first side 101 where the positive and negative poles 302 of the bus bar 300 are located is higher, and the voltage of the second side 102 where the connection terminal 510 of the circuit board 500 is located is lower. The positive and negative poles 302 and the connecting terminals 510 are arranged on different sides, so that arrangement of high-voltage and low-voltage connecting wires is facilitated, and potential safety hazards caused by reciprocating staggering of the high-voltage and low-voltage connecting wires are prevented.

Referring to fig. 1, a cavity is formed in the housing 100 to accommodate the electric core assembly 200, and a second insulating layer 600 is disposed between the outer circumference of the electric core assembly 200 and the inner wall of the cavity.

Specifically, referring to fig. 1, the housing 100 includes a cover plate 110, a side plate 120 and an end plate 130, the cover plate 110, the side plate 120 and the end plate 130 enclose a cavity, and the second insulating layer 600 is disposed on inner walls of the cover plate 110, the side plate 120 and the end plate 130.

In some embodiments, the cover plate 110, the side plate 120, and the end plate 130 are separate structures and are fixedly connected by welding, riveting, or the like. In other embodiments, the cover plate 110, the side plate 120 and the end plate 130 may be an integrally formed structure, so that the integrity is good.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a power battery module which characterized in that includes:

a housing;

2. The power battery module according to claim 1, wherein the busbar includes a first busbar and a second busbar, the first busbar is connected in series with the core groups distributed from head to tail along the first direction, and the second busbar is used for respectively connecting two adjacent core groups at tail of the first direction to lead out the positive pole column and the negative pole column.

3. The power battery module according to claim 2, wherein the first bus bar and the second bus bar are stacked on the same side of all the cell packs, and the first bus bar and/or the second bus bar at different layers at least partially overlap.

4. The power battery module of claim 3, further comprising a first insulating layer sandwiched between overlapping portions of the first and/or second bus bars.

5. The power battery module as claimed in claim 2, wherein the first busbar comprises a main bus bar and a sub bus bar, the main bus bar is connected with the electrodes with different polarities on the same side, and the sub bus bar is connected with the electrodes with different polarities on the different sides.

6. The power battery module as claimed in claim 5, wherein the main bus bar is U-shaped and/or the auxiliary bus bar is Z-shaped.

7. The power battery module as claimed in claim 2, wherein the first bus bar and the second bus bar have bent portions bent along one side.

8. The power battery module as recited in claim 2, wherein the second busbar comprises a positive busbar and a negative busbar, the positive busbar is connected to the positive pole of one of the cell groups, and the negative busbar is connected to the negative pole of the other of the cell groups.

9. The power battery module as claimed in claim 1, further comprising a circuit board having connection terminals, wherein the circuit board is electrically connected to the battery pack, and the connection terminals are located on a second side of the housing opposite to the first side.

10. The power battery module as claimed in claim 1, wherein a cavity is formed in the housing to accommodate the electric core assembly, and a second insulating layer is disposed between the outer periphery of the electric core assembly and the inner wall of the cavity.