CN219303875U - Power battery module - Google Patents

Abstract

The utility model discloses a power battery module, which comprises a battery cell group with a plurality of superposed battery cells, at least two fixed brackets which are mutually spaced along the superposition direction of the battery cells and are connected with the battery cells, and an FPC (flexible printed circuit) connected with the battery cells, wherein the battery cell group is provided with a plurality of superposed battery cells; the fixed support is provided with a positive pole column perforation, a negative pole column perforation and an explosion-proof hole which penetrate through the thickness direction and are arranged on at least one cell; one of the opposite surfaces of the fixed bracket in the thickness direction is provided with a limiting groove for accommodating the FPC. According to the power battery module, more than two fixing brackets are combined into the limiting groove of the FPC, the FPC can be effectively fixed, and compared with a plastic isolation plate or a plastic suction plate on the top surface of the module in the prior art, the power battery module is beneficial to reducing the weight of an integrated busbar, so that the dead weight of the whole battery module is reduced, and the development and production cost is reduced.

Description

Power battery module

Technical Field

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

Background

Compared with the traditional wire harness, the FPC (flexible circuit board) in the power battery structure has the advantages of high integration level, ultrathin thickness, light weight and the like, and is beneficial to improving the space utilization rate and energy density of the battery pack.

In the existing CCS (integrated busbar), the FPC and the NTC (temperature sensor) are supported and fixed by taking a plastic isolation plate or a plastic suction plate as a bracket, so that the dead weight of the plastic isolation plate or the plastic suction plate is large, the occupied height in the Z direction of the module is large, and the development cost is high; the CCS of other structures, because of their soft structure, cannot directly fix a temperature sensor to detect the temperature of the top cap of the cell.

Disclosure of Invention

One of the purposes of the utility model is to overcome the defects in the prior art, and provide a battery module, wherein more than two fixing brackets are used for combining and limiting FPC, so that the weight of an integrated busbar is reduced.

In order to achieve the technical effects, the technical scheme of the utility model is as follows: the power battery module comprises a battery cell group with a plurality of stacked battery cells, at least two fixing brackets which are mutually spaced along the stacking direction of the battery cells and are connected with the battery cells, and an FPC (flexible printed circuit) connected with the battery cells; the fixed support is provided with a positive pole column perforation, a negative pole column perforation and an explosion-proof hole which penetrate through the thickness direction and are arranged on at least one cell; one of the opposite surfaces of the fixed support in the thickness direction is provided with a limiting groove for accommodating the FPC.

The preferable technical scheme is that the number of the positive pole perforation, the negative pole perforation and the explosion-proof hole of the fixed support is one, and the positive pole perforation, the negative pole perforation and the explosion-proof hole are correspondingly arranged with the pole and the explosion-proof valve of the same battery cell.

The preferred technical scheme is that the number of the fixed brackets is smaller than the number of the battery cells.

The preferable technical scheme is that the other one of the opposite surfaces of the thickness direction of the fixed bracket is provided with a limiting recess; the temperature sensor is connected with the FPC and is arranged in the limiting recess.

The preferable technical scheme is that the limit groove is provided with a first positioning piece for positioning the FPC; and/or the limiting recess is provided with a second positioning piece for positioning the temperature sensor.

The preferable technical scheme is that the fixing support comprises a pole sleeve joint ring, the positive pole perforation and/or the negative pole perforation are/is arranged on the pole sleeve joint ring, and a first lightening hole is arranged between the sleeve joint ring and the limiting groove;

and/or the fixed support comprises an explosion-proof ring, the explosion-proof hole is formed in the explosion-proof ring, and a second lightening hole is formed in the side of the explosion-proof ring.

The preferable technical scheme is that the fixing support is provided with a reinforcing rib extending along the length direction of the groove, and the limiting groove is formed by the reinforcing rib and the surface of the fixing support.

The preferable technical proposal is that the utility model also comprises a bar sheet;

the pole of the battery core protrudes out of the top cover, the pole is connected with the fixing support and the bar, and the fixing support is clamped between the bar and the top cover.

The FPC comprises a main body part and a turnover part;

the main body part set up in the spacing groove, the turning over a section has relative stiff end and free end, the stiff end with the main body part is connected, the free end turn over set up in spacing sunken and with temperature sensor connects.

The preferable technical scheme is that the FPC is provided with a through hole, and the through hole is opposite to the explosion-proof hole and the explosion-proof valve of each battery cell.

The utility model has the advantages and beneficial effects that:

according to the power battery module, more than two fixing brackets are combined into the limiting groove of the FPC, the FPC can be effectively fixed, and compared with a plastic isolation plate or a plastic suction plate on the top surface of the module in the prior art, the power battery module is beneficial to reducing the weight of an integrated busbar, so that the dead weight of the whole battery module is reduced, and the development and production cost is reduced.

Drawings

Fig. 1 is a schematic perspective view of an embodiment of a power battery module;

FIG. 2 is a schematic perspective view of the fixing bracket;

FIG. 3 is another perspective view of the stationary bracket;

FIG. 4 is an enlarged view of a portion of FIG. 1A;

FIG. 5 is a schematic view showing the bottom structure of the connection structure of the tab, FPC, fixing bracket and temperature sensor;

FIG. 6 is an enlarged view of a portion of B in FIG. 5;

in the figure: 1. a battery cell; 11. a top cover; 2. a fixed bracket; 21. perforating the positive pole; 22. perforating a negative pole column; 23. explosion-proof holes; 24. a limit groove; 25. limiting depression; 26. a first positioning member; 27. a second positioning member; 28. a first lightening hole; 29. a second lightening hole; 210. reinforcing ribs; 3. an FPC; 31. a main body portion; 32. a turnover part; 321. a fixed end; 322. a free end; 4. a temperature sensor; 5. and (3) a cataplasm.

Detailed Description

The following describes the embodiments of the present utility model further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model.

In the description of the present application, it is to be noted that, unless otherwise indicated, the meaning of "plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like indicate an orientation or positional relationship merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present application.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected. The specific meaning of the above terms in the present utility model can be understood as appropriate by those of ordinary skill in the art.

Examples

As shown in fig. 1-2, the power battery module of the embodiment includes a battery cell group having a plurality of stacked battery cells 1, at least two fixing brackets 2 spaced apart from each other in a stacking direction of the battery cells 1 and connected to the battery cells 1, and an FPC3 connected to the battery cells 1; the fixed bracket 2 is provided with a positive pole column perforation 21, a negative pole column perforation 22 and an explosion-proof hole 23 which penetrate through the thickness direction and are arranged on at least one cell 1; one of the opposite surfaces of the fixing bracket 2 in the thickness direction is provided with a stopper groove 24 accommodating the FPC 3.

Optionally, the fixing support 2 is mounted on one cell 1 or more than two cells 1, the number of the positive pole perforations 21 and the number of the negative pole perforations 22 are equal or unequal, and/or the number of the positive pole perforations 21 and the number of the explosion-proof holes 23 are equal or unequal. The fixed bracket 2 includes, but is not limited to, the following structures: the fixing support 2 is provided with two positive pole through holes 21, two negative pole through holes 22 and two explosion-proof holes 23, or the fixing support 2 is provided with one positive pole through hole 21, two negative pole through holes 22 and one explosion-proof hole 23, or the fixing support 2 is provided with three positive pole through holes 21, one negative pole through hole 22 and one explosion-proof hole 23.

Based on the same thickness, structure and material, the sum of the masses of at least two of the fixing brackets 2 is smaller than the monolithic continuous fixing bracket 2, compared to the monolithic continuous plastic bracket covering the top surface of the cell stack. Specifically, when two adjacent cells 1 are connected with respective fixing brackets 2, the interval between the adjacent fixing brackets 2 is opposite to the partial top cover of the two adjacent cells 1; the battery cell 1 which is not connected with the fixed support 2 is used as a first battery cell, and when the first battery cell is clamped between the two battery cells 1 connected with the fixed support 2, the interval of the fixed support 2 is opposite to the whole top cover of at least one battery cell 1. The FPC3 is disposed astride the space between the adjacent fixing brackets 2.

It can be understood that, in the battery module structure, the positive electrode post and the negative electrode post protrude from the top cover 11, the fpc3 and the top cover 11 are separately disposed at two sides of the fixed bracket 2, that is, the limiting groove 24 is disposed at the surface of the fixed bracket 2 opposite to the top cover 11; the extending direction of the FPC3 is identical to the stacking direction of the battery cells 1, that is, the groove length direction of the limit groove 24 is identical to the stacking direction of the battery cells 1.

The explosion-proof hole 23 is arranged opposite to the explosion-proof valve of the battery cell 1 and is used for pressure relief of the battery cell 1 in thermal runaway.

When the fixed bracket 2 is connected with more than two battery cells 1, the following technical defects exist: firstly, the distance between the pole perforation holes connected with the adjacent cells 1 is required to have higher processing precision and assembly precision, and the extrusion acting force exerted on the cells 1 is also determined by the pole perforation distance between the two adjacent cells 1 of the fixed bracket 2; secondly, the expansion of the battery cell 1 can cause the increase of the pole column distance between the battery cell 1 and the adjacent battery cell 1, so that the fixed support 2 is damaged, and the positioning of the FPC3 is affected.

As shown in fig. 2, in another embodiment, the number of the positive electrode post through holes 21, the negative electrode post through holes 22 and the explosion-proof holes 23 of the fixing support 2 is one, and the positive electrode post through holes 21, the negative electrode post through holes 22 and the explosion-proof holes 23 are arranged corresponding to the poles and the explosion-proof valves of the same electric cell 1, that is, the fixing support 2 is connected with one electric cell 1. Besides the technical defects of the two points, compared with the distance between the poles of the adjacent cells 1, the distance between the positive pole and the negative pole of the same cell 1 is more accurate, and the assembly precision of the fixed support 2 and the poles of the same cell 1 is high.

In another preferred embodiment, as shown in fig. 1, the number of fixing brackets 2 is smaller than the number of cells 1. In the figure, the number of the battery cells 1 of the battery cell 1 module is 12, and the number of the fixing brackets 2 is 3. The smaller the number of the fixed brackets 2 is, the smaller the dead weight of the integrated busbar is; however, the number of the fixing brackets 2 is required to satisfy the structural requirement of fixing the FPC 3.

In another preferred embodiment, as shown in fig. 2, the other of the opposite surfaces in the thickness direction of the fixing bracket 2 is provided with a limiting recess 25; the temperature sensor 4 is connected to the FPC3 and is disposed in the limiting recess 25.

The temperature sensor 4 is used for detecting the temperature of the top cover 11 of the battery cell 1, and the temperature sensor 4 is arranged between the fixed support 2 and the top cover 11, so that the position stability and the detection reliability of the temperature sensor 4 and the top cover 11 are improved. Further, the limiting recess 25 and a local area of the bottom surface of the limiting groove 24 are opposite to each other along the thickness direction of the fixing bracket 2, and further, the limiting recess 25 and a local area of the side edge of the bottom surface of the limiting groove 24 are opposite to each other.

FPC and temperature sensor integration set up in same fixed bolster, avoid setting up plastics division board and sensor setting element simultaneously, do benefit to the structure of simplifying the female row of integration.

As shown in fig. 2, 3, 5, and 6, in another preferred embodiment, the limiting groove 24 is provided with a first positioning member 26 for positioning the FPC3; and/or the limit recess 25 is provided with a second positioning member for positioning the temperature sensor 4. In the figure, the first positioning piece 26 and the second positioning piece 27 are protruding columns arranged on the fixed support 2, and the FPC3 is provided with through holes sleeved with the protruding columns.

As an equivalent replacement for fixing the FPC3, the first positioning member and/or the second positioning member may be selected to be a protruding strip disposed on both sides of the limit groove and/or the limit recess, the length direction of the protruding strip extends along the groove length direction of the limit groove, the width direction of the protruding strip extends from the groove side wall to the groove width middle portion, and the protruding strip is provided with a limit interval with the groove bottom of the limit groove and/or the recess bottom surface of the limit recess. When the FPC3 is assembled, the FPC3 is installed in the limiting interval by utilizing the flexible characteristic of the FPC 3.

As shown in fig. 2, in another preferred embodiment, the fixing support 2 includes a post sleeve, the positive post through hole 21 and/or the negative post through hole 22 are/is provided on the post sleeve, and a first lightening hole 28 is provided between the sleeve and the limiting groove 24; and/or the fixed bracket 2 comprises an explosion-proof ring, the explosion-proof hole 23 is arranged on the explosion-proof ring, and a second lightening hole 29 is arranged on the side of the explosion-proof ring.

The lightening holes can be blind holes or through holes, and the through holes penetrate through the thickness direction of the fixed support 2 in the drawing. Connecting ribs are arranged between the adjacent first lightening holes 28 to ensure the connection strength of the pole sleeve joint ring and the limit groove 24; connecting ribs are also arranged between the adjacent second lightening holes 29, the second lightening holes 29 are mutually spaced and are surrounded on the periphery of the explosion-proof ring, besides the function of optimizing the lightening fixing support 2, the area between the first lightening holes 28 and the second lightening holes 29 is used for supporting the FPC, a continuous supporting bottom surface is provided for the FPC, and the setting positions of the lightening holes are more reasonable.

The bottom of the limit groove 24 is lower or higher than the surface of the pole perforated portion, or the bottom of the limit groove 24 is flush with the surface of the pole perforated portion.

In another preferred embodiment, as shown in fig. 2, the fixing bracket 2 is provided with a reinforcing rib 210 extending in the groove length direction, and the limit groove 24 is composed of the reinforcing rib 210 and the surface of the fixing bracket 2. The reinforcing ribs 210 extending in the groove length direction help to increase the groove length direction strength of the fixing bracket 2. The bottom of the limiting groove 24 in the drawing is flush with the surface of the pole perforated portion to ensure effective support of the bottom surface of the limiting groove 24 for the FPC 3.

As shown in fig. 1 and 5, in another preferred embodiment, the battery module further includes a tab 5; the pole of the battery core 1 protrudes out of the top cover 11, the pole is connected with the fixing support 2 and the tab 5, and the fixing support 2 is clamped between the tab 5 and the top cover 11. The tab 5 defines the position of the fixing bracket 2 in the Z direction with the projecting direction of the pole in the top cover 11 as the Z direction. The chip 5 is mostly copper or aluminum. Specifically, the tab 5 is welded with the nickel sheet, and the nickel sheet is connected with the FPC3 for collecting the voltage of the tab 5.

As shown in fig. 1 and 4, in another preferred embodiment, the FPC3 includes a main body portion 31 and a turnover portion 32; the main body 31 is disposed in the limiting groove 24, the turnover part 32 has a fixed end 321 and a free end 322, the fixed end 321 is connected with the main body 31, and the free end 322 is turnover and disposed in the limiting recess 25 and connected with the temperature sensor 4.

The main body 31 of the FPC3 is elongated extending in the stacking direction of the cells 1, the outer contour of the main body 31 of the FPC3 is rectangular, the turnover part 32 is convex outside the rectangular outer contour, or as shown in fig. 4 and 5, the turnover part 32 is located inside the main body 31 of the rectangular outer contour. Further, in the flattened state of the main body 31 and the folded portion 32 of the FPC3, the direction from the fixed end 321 to the free end 322 coincides with the extending direction of the strip of the main body 31 of the FPC 3. The fold 32 is obtained via the following process: the L-shape is die cut at the side of the FPC3, and the cut edge of the L-shape extends to the long side of the FPC3, or the U-shape is die cut at a region spaced from the FPC 3.

In another preferred embodiment, as shown in fig. 5, the FPC3 is provided with a through hole 33, and the through hole 33 is disposed opposite to the explosion-proof hole 23 and the explosion-proof valve of each cell 1, and the above structure facilitates rapid pressure release of the cells 1 in the event of thermal runaway.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims (10)

1. The power battery module is characterized by comprising a battery cell group with a plurality of superposed battery cells, at least two fixing brackets which are mutually spaced along the superposition direction of the battery cells and are connected with the battery cells, and an FPC (flexible printed circuit) connected with the battery cells; the fixed support is provided with a positive pole column perforation, a negative pole column perforation and an explosion-proof hole which penetrate through the thickness direction and are arranged on at least one cell; one of the opposite surfaces of the fixed support in the thickness direction is provided with a limiting groove for accommodating the FPC.

2. The power battery module according to claim 1, wherein the number of the positive electrode post through holes, the negative electrode post through holes and the explosion-proof holes of the fixing support is one, and the positive electrode post through holes, the negative electrode post through holes and the explosion-proof holes are arranged corresponding to the electrode posts and the explosion-proof valves of the same electric core.

3. The power battery module according to claim 1 or 2, wherein the number of the fixing brackets is smaller than the number of the electric cells.

4. The power battery module according to claim 1, wherein the other one of the opposite surfaces in the thickness direction of the fixing bracket is provided with a limiting recess; the temperature sensor is connected with the FPC and is arranged in the limiting recess.

5. The power battery module according to claim 1, wherein the limit groove is provided with a first positioning member for positioning the FPC; and/or the limiting recess is provided with a second positioning piece for positioning the temperature sensor.

6. The power battery module according to claim 1, wherein the fixing bracket comprises a pole sleeve ring, the positive pole through hole and/or the negative pole through hole are/is arranged on the pole sleeve ring, and a first lightening hole is arranged between the sleeve ring and the limit groove;

and/or the fixed support comprises an explosion-proof ring, the explosion-proof hole is formed in the explosion-proof ring, and a second lightening hole is formed in the side of the explosion-proof ring.

7. The power battery module according to claim 1, wherein the fixing bracket is provided with a reinforcing rib extending in a groove length direction, and the limit groove is composed of the reinforcing rib and a surface of the fixing bracket.

8. The power battery module of claim 1, further comprising a tab;

the pole of the battery core protrudes out of the top cover, the pole is connected with the fixing support and the bar, and the fixing support is clamped between the bar and the top cover.

9. The power cell module of claim 4, wherein the FPC includes a main body portion and a turnover portion;

the main body part set up in the spacing groove, the turning over a section has relative stiff end and free end, the stiff end with the main body part is connected, the free end turn over set up in spacing sunken and with temperature sensor connects.

10. The power battery module according to claim 1, wherein the FPC is provided with a through hole, the through hole being disposed opposite to the explosion-proof hole and the explosion-proof valve of each of the battery cells.

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