CN218101483U - Battery module - Google Patents

Abstract

The utility model provides a battery module, including at least one electric core group and at least one buffering subassembly, the buffering subassembly set up at least in one side of electric core group. The utility model provides a battery module cushions the position of subassembly through rational design to improve the holistic radiating efficiency of battery module.

Description

Battery module

Technical Field

The utility model belongs to the technical field of the battery technique and specifically relates to a battery module is related to.

Background

With the development of electronic technology, batteries have the advantages of high specific power, long cycle life, good safety performance, no pollution and the like, so that the batteries are widely applied.

And the battery can have safety problems such as inflation in the use, in order to solve above-mentioned inflation problem, current battery module generally sets up the bubble cotton that has compression resilience function between each adjacent electric core, but because the cotton heat conductivility of bubble is poor, and bubble cotton and electric core direct contact, the event has reduced the radiating efficiency of electric core, cooling system can not in time conduct the heat away, lead to the battery under the high rate discharge operating mode, the temperature of battery exceeds safe service temperature, influence the cycle life and the security performance of battery. Meanwhile, the battery has the problem of expansion after being used for a long time, so that the battery core lug is torn by the tensile force generated after the battery core expands, and the safety of the battery is influenced.

Disclosure of Invention

The utility model aims at providing a battery module, it is not enough to aim at solving above-mentioned background existence, improves the holistic radiating efficiency of battery module.

The utility model provides a battery module, including at least one electric core group and at least one buffering subassembly, the buffering subassembly set up at least in one side of electric core group.

In one implementation, the buffer assembly includes a second thermally conductive frame and a buffer material disposed within the second thermally conductive frame.

In an implementable manner, the number of the electric core groups is multiple, the multiple electric core groups are sequentially arranged along the length direction of the battery module, and the buffer assembly is arranged between at least two adjacent electric core groups.

In an achievable mode, the buffer component is arranged between every two adjacent electric core groups.

In an implementable manner, the battery cell pack includes at least one battery cell and at least one first heat-conducting frame, the battery cell being disposed within the first heat-conducting frame.

In an implementable manner, one cell is disposed within at least one of the first heat-conducting frames.

In an implementation manner, a plurality of battery cells are arranged in at least one first heat conduction frame.

In one implementation, the second heat-conducting frame is in contact with the adjacent first heat-conducting frame.

In an implementable manner, the second heat-conducting frame is in contact with the cells in the adjacent first heat-conducting frame, and the buffer material in the second heat-conducting frame is not in contact with the cells in the adjacent first heat-conducting frame.

In one implementation, the buffer assembly further includes a filler material disposed within the second thermally conductive frame.

In an implementable manner, the buffer material is disposed within the second thermally conductive frame adjacent to the filler material.

In an implementation manner, the first heat conducting frame is provided with a first accommodating groove, and the battery cell is disposed in the first accommodating groove; the second heat conduction frame is provided with a second containing groove, and the buffer material is arranged in the second containing groove.

In one implementation, the first and second heat-conducting frames are made of a heat-conducting material.

In an implementable manner, the battery module further includes a heat dissipation plate in contact with the first heat conduction frame and/or the second heat conduction frame.

In an implementable manner, the electrical core is provided with a tab, which is provided with a buffer structure.

The utility model provides a battery module through the position that changes buffering subassembly, sets up buffering subassembly in at least one side of electric core group (the bubble is cotton to be set up in current design between each adjacent electric core, has reduced the radiating efficiency of electric core), can reduce the thermal effect that hinders of buffering subassembly to electric core to improve the holistic radiating efficiency of battery module.

Drawings

Fig. 1 is a schematic perspective view of a battery module according to an embodiment of the present invention.

Fig. 2 is a schematic view of the exploded structure of fig. 1.

Fig. 3 is a schematic structural view of the electric core assembly in fig. 2.

Fig. 4 is a schematic view of an assembly structure of the battery cell and the first heat conducting frame in fig. 3.

Fig. 5 is a schematic diagram of the exploded structure of fig. 4.

Fig. 6 is a schematic structural diagram of the battery cell in fig. 5.

Fig. 7 is a schematic structural diagram of the buffering assembly in fig. 2.

Fig. 8 is a schematic view of the exploded structure of fig. 7.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The terms of orientation of the upper, lower, left, right, front, back, top, bottom, etc. (if any) referred to in the specification and claims of the present invention are defined as the positions of the structures in the drawings and the positions of the structures relative to each other, and are only for the sake of clarity and convenience in describing the technical solutions. It is to be understood that the use of directional terms should not be taken to limit the scope of the invention as claimed.

As shown in fig. 1 to fig. 6, the embodiment of the utility model provides a battery module is particularly useful for laminate polymer battery module. The battery module comprises at least one electric core group 1 and at least one buffering component 2, wherein the buffering component 2 is at least arranged on one side of the electric core group 1.

As shown in fig. 3 to fig. 5, as an embodiment, each battery cell pack 1 includes at least one battery cell 11 and at least one first heat-conducting frame 12, the battery cell 11 is disposed in the first heat-conducting frame 12, and the first heat-conducting frame 12 is attached to the battery cell 11.

Specifically, in this embodiment, the battery cell 11 is disposed in the first heat conducting frame 12, and the battery cell 11 can conduct heat through the first heat conducting frame 12, so as to improve a heat dissipation effect of the battery cell 11; change the position of buffer unit 2 simultaneously, set up buffer unit 2 in at least one side of electric core group 1 (in current design with the bubble cotton set up in between each adjacent electric core, make the bubble cotton directly contact with electric core, form the heat effect of hindering to electric core, reduced the radiating efficiency of electric core). The utility model provides a buffer assembly 2 is with buffer material 22 in second heat conduction frame 21 like the cotton setting of bubble for buffer assembly 2 does not directly contact with electric core 11, can reduce buffer assembly 2 and to electric core 11 hinder hot effect, thereby improves the holistic radiating efficiency of battery module.

As shown in fig. 4 and 5, as an embodiment, one battery cell 11 is disposed in at least one first heat conducting frame 12.

As another embodiment, a plurality of battery cells 11 are disposed in the at least one first heat-conducting frame 12.

As shown in fig. 2 and fig. 3, as an embodiment, each electric core assembly 1 includes a plurality of electric cores 11 and a plurality of first heat conducting frames 12, the plurality of electric cores 11 respectively correspond to the plurality of first heat conducting frames 12 one by one, the plurality of first heat conducting frames 12 are sequentially arranged along the length direction L of the battery module, and each electric core 11 is disposed in one corresponding first heat conducting frame 12.

As an embodiment, the quantity of electric core 11 and first heat conduction frame 12 in every electric core group 1 can be the module and the even number of number is multiple to can keep the symmetry of busbar, reduce part kind, be convenient for production, and do benefit to the management and control of production process. For example, when the battery module is a 5P module (the parallel connection of the batteries is abbreviated as P, and the 5P module is a module parallel number of 5, and is a module formed by connecting 5 cells in parallel and then in series), each cell pack 1 may be provided with 10 cells 11 and 10 first heat-conducting frames 12; when the battery module is a 6P module, each electric core group 1 can be provided with 12 electric cores 11 and 12 first heat conducting frames 12; when the battery module is the 2P module, every electric core group 1 can set up 8 electric cores 11 and 8 first heat conduction frames 12.

As shown in fig. 2, as an embodiment, the number of the electric core groups 1 is plural, the plural electric core groups 1 are arranged in sequence along the length direction L of the battery module, and at least one of the two adjacent electric core groups 1 has a buffering component 2 (if the number of the electric core groups 1 is one, the buffering component 2 can be disposed on one side or two opposite sides of the electric core group 1).

As shown in fig. 2, as an embodiment, a buffer assembly 2 is arranged between every two adjacent electric core groups 1.

As shown in fig. 7 and 8, each buffer assembly 2 includes a second heat-conducting frame 21 and a buffer material 22, wherein the buffer material 22 is disposed in the second heat-conducting frame 21, and the second heat-conducting frame 21 is in contact with the adjacent first heat-conducting frame 12.

As shown in fig. 2, 3, and 7, as an embodiment, the second heat conduction frame 21 is in contact with the battery cell 11 in the adjacent first heat conduction frame 12, and the buffer material 22 in the second heat conduction frame 21 is not in contact with the battery cell 11 in the adjacent first heat conduction frame 12.

Specifically, the buffer material 22 plays a role in buffering and is used for absorbing deformation generated by expansion of the battery cell 11, so that the internal pressure of the battery module is kept stable, and the safety of the battery module is improved. Set up the structural strength that second heat conduction frame 21 can guarantee the battery module on the one hand, on the other hand can completely cut off buffer material 22 and electric core 11, avoids buffer material 22 and 11 direct contact of electric core and forms to electric core 11 and hinder hot effect, and electric core 11 can be through the heat conduction of second heat conduction frame 21 simultaneously to improve electric core 11's radiating effect. Through the arrangement of the first heat conduction frame 12 and the second heat conduction frame 21, heat can be conducted out from two sides of each battery cell 11 through the heat conduction frames (as an embodiment, the battery cell 11 inside the battery core group 1 conducts heat through the first heat conduction frame 12 and the second heat conduction frame 21 on the two opposite sides of the battery cell 11; as another embodiment, the battery cell 11 inside the battery core group 1 conducts heat through the first heat conduction frame 12 on the two opposite sides of the battery cell 11, and the battery cell 11 located on the outermost side in the battery core group 1 conducts heat through the first heat conduction frame 12 and the second heat conduction frame 21 on the two opposite sides of the battery cell), so that the overall heat dissipation efficiency of the battery module is improved.

As one embodiment, the cushioning material 22 may be foam. The total thickness of all the buffer materials 22 in the battery module may be calculated by the following formula: the total thickness of all the cells 11 within the battery module x the EOL expansion rate of the cells 11 = the total thickness of all the cushioning material 22 within the battery module x the compression rate of the cushioning material 22.

The compression ratio of the buffer material 22 refers to a ratio of a thickness difference (i.e., a compression amount) of the buffer material 22 before and after compression to a thickness before compression (for example, if the thickness of the buffer material 22 before compression is 10mm and the thickness after compression is 9mm, the compression ratio is (10-9)/10 = 10%), the compression ratio of the buffer material 22 is determined by the internal pressure of the module, and the specific range of the compression ratio of the buffer material 22 is as follows: the compression ratio of the lower limit of the module pressure to the compression ratio of the upper limit of the module pressure (the lower limit of the module pressure is the stable minimum pressure of the module, and the upper limit of the module pressure is the maximum pressure which can be borne by the battery cell 11); the EOL expansion ratio of the cell 11 is an inherent characteristic parameter of the cell 11. For convenience of calculation, all the battery cells 11 in the battery module may be set to be the same, so that the EOL expansion rates of all the battery cells 11 in the battery module are the same; at this time, the total thickness of all the battery cells 11 in the battery module = the total number of the battery cells 11 × the thickness of a single battery cell 11.

In the above calculation process, the total thickness of the buffer materials 22 in the battery module is the sum of the thicknesses of each of the buffer materials 22 in the battery module. Such as the thickness of each cushioning material 22, the total amount of cushioning material 22 within the battery module. In particular, if the thickness of a single cushioning material 22 is not uniform, the average thickness of the cushioning material 22 can be used in the calculation when calculating the thickness of the cushioning material 22.

For convenience of calculation, assuming that all the cushioning materials 22 in the battery module are the same, the cushioning materials 22 may be made of foam having the same thickness, and at this time, the total thickness of all the cushioning materials 22 in the battery module = the total number of the cushioning materials 22 × the thickness of a single cushioning material 22 (if one cushioning material 22 is provided in each cushioning module 2, the total number of the cushioning materials 22 is the same as the number of the cushioning modules 2; specifically, if three foams are provided at different positions in one cushioning module 2, the thickness of the cushioning material 22 in the cushioning module 2 is the sum of the thicknesses of the three foams). As an embodiment, the first heat conducting frame 12 and the second heat conducting frame 21 are made of a heat conducting material, such as a metal material (e.g., aluminum, which has a high heat conductivity and a low mass).

As an embodiment, the first heat-conducting frame 12 and the second heat-conducting frame 21 have the same size, so as to facilitate the manufacturing and assembling processes. Of course, in other embodiments, the sizes of the first heat-conducting frame 12 and the second heat-conducting frame 21 may be different.

As shown in fig. 7 and 8, as an embodiment, each buffer assembly 2 further includes a filling material 23 (or referred to as a dummy cell), and the filling material 23 is disposed in the second heat-conducting frame 21. The filler material 23 may be an insulating, non-intumescent sheet (i.e., a sheet that has insulating properties and does not expand when heated), such as a plastic sheet. The filling material 23 is used to fill the remaining space in the second heat conduction frame 21, so that the sum of the thicknesses of the filling material 23 and the buffer material 22 is approximately equal to the dimension thickness of the inside of the second heat conduction frame 21, i.e., the filling material 23 and the buffer material 22 fill the second heat conduction frame 21 together, thereby increasing the structural strength while saving the cost of the buffer material 22. Of course, in other embodiments, only the cushioning material 22 may be provided, and the filling material 23 may not be provided.

As shown in fig. 7 and 8, in one embodiment, the buffer material 22 is disposed adjacent to the filler material 23 in the second heat-conducting frame 21.

As shown in fig. 5 and fig. 8, as an embodiment, the first heat conducting frame 12 is provided with a first receiving groove 121, and the battery cell 11 is disposed in the first receiving groove 121. The second heat conducting frame 21 has a second receiving cavity 211, and the buffer material 22 is disposed in the second receiving cavity 211.

As shown in fig. 2, in one embodiment, the battery module further includes a heat dissipation plate 3, the heat dissipation plate 3 is disposed at one side of the electric core pack 1, and the heat dissipation plate 3 is in contact with the first heat conduction frame 12 and/or the second heat conduction frame 21.

As shown in fig. 2, as an embodiment, the heat dissipation plate 3 is in contact with both the end of the first heat conduction frame 12 and the end of the second heat conduction frame 21.

As shown in fig. 2, as an embodiment, the number of the heat dissipation plates 3 is two, the two heat dissipation plates 3 are respectively disposed on the upper and lower sides of the electric core assembly 1, the heat dissipation plate 3 located above contacts with the top end of the first heat conduction frame 12 and the top end of the second heat conduction frame 21 at the same time, and the heat dissipation plate 3 located below contacts with the bottom end of the first heat conduction frame 12 and the bottom end of the second heat conduction frame 21 at the same time.

As an embodiment, the heat dissipation plate 3 is a water cooling plate, heat generated by the battery cell 11 is conducted to the heat dissipation plate 3 through the first heat conduction frame 12 and the second heat conduction frame 21, and the heat dissipation plate 3 dissipates the heat of the battery cell 11 by using a circulation flow of a cooling fluid (e.g., water).

As shown in fig. 6, as an embodiment, the battery cell 11 is provided with a tab 111, and a buffer structure 111a is formed on the tab 111 by bending, where the buffer structure 111a is used to compress the length of the tab 111.

Specifically, the buffer structure 111a can absorb a tensile force generated on the tab 111 when the battery cell 11 expands (after the tab 111 is subjected to the tensile force, the buffer structure 111a is unfolded to extend the length of the tab 111), so as to prevent the tab 111 from being torn, prevent the tab 111 from being separated from the bus bar, or prevent the tab 111 from being disconnected from a tab adhesive (not shown), and improve the safety of the battery.

In one embodiment, the buffer structure 111a may have a concave arc shape, a curved shape, a convex arc shape, a zigzag shape, a wavy shape, or the like.

As an embodiment, the compressed length of the tab 111 (i.e. the difference between the length of the tab 111 before bending and the length of the tab 111 after bending) is greater than or equal to the maximum expansion displacement of the outermost cell 11 in the cell group 1 (the expansion displacement of the outermost cell 11 in the cell group 1 is greater than that of the other cells 11), so as to prevent the tab 111 from being torn during the expansion of the cell 11. Wherein the maximum amount of expansion displacement of the outermost cells 11 =1/2 × the total thickness of the cells 11 (the total thickness of all the cells 11 in the cell group 1) × the EOL expansion coefficient of the cells 11. The length of the compressed tab 111 is less than or equal to two times of the maximum expansion displacement of the outermost cells 11 in the cell group 1. Alternatively, the length of the tab 111 compressed is less than or equal to 5mm.

As shown in fig. 2, the battery module further includes a positive electrode bus bar 51, a negative electrode bus bar 52, and an overcurrent bus bar 53, and the positive electrode bus bar 51, the negative electrode bus bar 52, and the overcurrent bus bar 53 are aluminum bus bars. The positive electrode bus bar 51 is used for connecting positive electrode tabs of each electric core 11 in the electric core group 1, the negative electrode bus bar 52 is used for connecting negative electrode tabs of each electric core 11 in the electric core group 1, and the overcurrent bus bar 53 is used for connecting two adjacent electric core groups 1.

As shown in fig. 1 and 2, as an embodiment, the battery module further includes a bus bar cover plate 4 and an end plate 6, and the bus bar cover plate 4, the end plate 6 and the heat dissipation plate 3 cooperate to enclose all the electric core packs 1 to form the battery module.

Specifically, the working principle of the battery module of this embodiment is: when the module carries out the high magnification during operation, the heat that electric core 11 produced conducts to heating panel 3 through first heat conduction frame 12 and/or second heat conduction frame 21 of electric core 11 both sides on, the heating panel 3 of upper and lower both sides provides cooling function simultaneously to carry out quick heat dissipation cooling to electric core 11. When the battery cell 11 expands, the buffer assembly 2 absorbs the expansion of the battery cell 11 through the resilience of the buffer material 22, and meanwhile, the buffer structure 111a on the tab 111 of the battery cell 11 can absorb the deformation caused by the expansion of the battery cell 11, so as to prevent the tab 111 from being torn.

The embodiment of the utility model provides a battery module sets up electric core 11 in first heat conduction frame 12, and electric core 11 can be through the heat conduction of first heat conduction frame 12 to improve electric core 11's radiating effect. Buffering subassembly 2 can absorb the inflation that electric core 11 produced effectively, simultaneously through the position that changes buffering subassembly 2, can reduce buffering subassembly 2 to electric core 11 hinder hot effect, and second heat conduction frame 21 in buffering subassembly 2 can further improve the radiating effect moreover to improve the holistic radiating efficiency of battery module. The buffer structure 111a on the tab 111 can effectively absorb the pulling force generated on the tab 111 when the battery cell 11 expands, so that the tab 111 is prevented from being torn, the tab 111 and a bus bar are prevented from being separated, or the tab 111 is prevented from being disconnected from the tab glue connection part, and the safety of the battery is improved. To sum up, the embodiment of the utility model provides a battery module has solved the discharged heat dissipation problem of module high rate and the security problem that leads to because of the battery inflation after the battery circulation.

The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (17)

1. A battery module comprises at least one electric core group (1) and at least one buffer assembly (2), and is characterized in that the electric core group (1) comprises at least one electric core (11); the buffer component (2) is at least arranged on one side of the electric core group (1); buffer assembly (2) include second heat conduction frame (21) and buffer material (22), buffer material (22) set up in second heat conduction frame (21).

2. The battery module according to claim 1, wherein the number of the electric core groups (1) is plural, the plural electric core groups (1) are arranged in sequence along the length direction (L) of the battery module, and the buffer assembly (2) is arranged between at least two adjacent electric core groups (1).

3. The battery module according to claim 2, wherein the buffer assembly (2) is disposed between every two adjacent electric core groups (1).

4. The battery module according to claim 1, wherein the buffer member (2) further comprises a filling material (23), and the filling material (23) is disposed in the second heat conductive frame (21).

5. The battery module according to claim 4, wherein the buffer material (22) is disposed inside the second heat conductive frame (21) adjacent to the filling material (23).

6. The battery module according to claim 1, wherein the cell pack (1) further comprises at least one first heat-conducting frame (12), and the cells (11) are arranged in the at least one first heat-conducting frame (12).

7. The battery module according to claim 6, wherein the battery cell (11) is disposed in each of the first heat-conducting frames (12).

8. The battery module according to claim 6, wherein one of the battery cells (11) is disposed in at least one of the first heat-conducting frames (12).

9. The battery module according to claim 6, wherein a plurality of the battery cells (11) are disposed in at least one of the first heat-conducting frames (12).

10. The battery module according to claim 6, wherein the second heat conductive frame (21) is in contact with the adjacent first heat conductive frame (12).

11. The battery module according to claim 6, wherein the first heat-conducting frame (12) is provided with a first accommodating groove (121), and the battery cells (11) are arranged in the first accommodating groove (121); the second heat conducting frame (21) is provided with a second accommodating groove (211), and the buffer material (22) is arranged in the second accommodating groove (211).

12. The battery module according to claim 6, further comprising a heat dissipation plate (3), wherein the heat dissipation plate (3) is in contact with the first heat conductive frame (12) and/or the second heat conductive frame (21).

13. The battery module according to any one of claims 1 to 12, wherein the total thickness of all the buffer materials (22) within the battery module is determined by the following formula: the total thickness of all the cells (11) within the battery module together with the EOL expansion rate of the cells (11) together with the total thickness of all the cushioning materials (22) within the battery module together with the compression rate of the cushioning materials (22).

14. The battery module according to any one of claims 1 to 12, characterized in that the battery cells (11) are provided with tabs (111), and the tabs (111) are provided with buffer structures (111 a).

15. The battery module according to claim 14, wherein the compressed length of the tab (111) is greater than or equal to the maximum expansion displacement of the outermost cells (11) in the cell group (1).

16. The battery module according to claim 15, wherein the compressed length of the tab (111) is less than or equal to twice the maximum expansion displacement of the outermost cells (11) in the cell group (1).

17. The battery module according to claim 15, wherein the maximum amount of expansion displacement of the outermost cells (11) of the core pack (1) is = 1/2% of the total thickness of all the cells (11) of the core pack (1) is the EOL expansion coefficient of the cells (11).

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