CN216624395U

CN216624395U - Battery module

Info

Publication number: CN216624395U
Application number: CN202122740900.8U
Authority: CN
Inventors: 卢青梅; 陈保国; 李召波; 兑瀚; 张福增
Original assignee: Tianjin EV Energies Co Ltd
Current assignee: Tianjin EV Energies Co Ltd
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-05-27
Anticipated expiration: 2031-11-10

Abstract

The utility model relates to the technical field of batteries, in particular to a battery module which comprises a shell, N liquid cooling plates and N +1 electric core groups. The casing includes the bottom plate, and the parallel interval of N liquid cooling board sets up on the bottom plate, and the face of N liquid cooling board all sets up with the face of bottom plate is perpendicular. N liquid cooling board and casing form N +1 cavity, and N is the positive integer, and N +1 electric core group sets up respectively in N +1 cavity. The heat transfer path of the heat transfer medium in the liquid cooling plate is greatly shortened by the battery cell in the battery cell group, and the heat can be timely transmitted to the outside of the battery module along with the flow of the heat transfer medium. Every electric core group of this battery module includes a plurality of electric cores and a plurality of bolster, and every bolster setting is between adjacent electric core to absorb the deformation that electric core inflation caused.

Description

Battery module

Technical Field

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

Background

With the development of new energy industry, electric vehicles are more and more widely applied. The soft package lithium ion battery has the advantages of light weight, high specific capacity, good safety performance, small internal resistance, flexible design and the like, and is widely used. The endurance mileage of the electric vehicle, and the stability and safety of the battery are receiving more and more attention. How to improve the endurance mileage of the electric automobile, improve the energy density of the power battery, improve the safety of the power battery, and improve the heat dissipation capacity of the single battery becomes the key for the development of the electric automobile in future.

Current soft package lithium ion battery module adopts monomer electric core longitudinal arrangement's structure usually, sets up the liquid cooling board and dispels the heat to the battery module bottom the box. The structure increases the heat dissipation path of the battery core on one hand, and is not beneficial to the heat conduction of the battery core. On the other hand, set up the liquid cooling board in bottom half and reduced the high utilization ratio in space of battery module, be unfavorable for promoting the volume energy density of battery module.

Therefore, a battery module is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a battery module, which can shorten a heat dissipation path of a battery core, improve the heat dissipation rate, avoid heat accumulation, improve the space utilization rate of a liquid cooling plate and improve the volume energy density of the battery module.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a battery module, comprising:

a housing comprising a base plate;

the N liquid cooling plates are arranged on the bottom plate in parallel at intervals, the plate surfaces of the N liquid cooling plates are all perpendicular to the plate surface of the bottom plate, the N liquid cooling plates and the shell form N +1 cavities, and N is a positive integer;

n +1 electric core group, N +1 electric core group sets up respectively in N +1 in the cavity, every electric core group includes a plurality of electric cores and a plurality of bolster, every the bolster sets up adjacently between the electric core.

Optionally, the length direction of the liquid cooling plate is consistent with the length direction of the bottom plate, and the length direction of the flow channel in the liquid cooling plate is consistent with the length direction of the liquid cooling plate.

Optionally, the water inlet and the water outlet of the liquid-cooled plate are located at the same end.

Optionally, a plurality of flow channels are arranged in the liquid cooling plate, and each electric core is in contact with one or more flow channels.

Optionally, the liquid cooling plate further comprises a heat conducting glue, and the heat conducting glue is filled in gaps among the electric core group, the liquid cooling plate and the inner wall surface of the shell in the cavity.

Optionally, still include thermal-insulated insulating piece, thermal-insulated insulating piece sets up between the casing with the electric core group.

Optionally, the battery cell assembly further comprises two busbars arranged in the casing, the two busbars are respectively located at two ends of the battery cell assembly along the length direction of the bottom plate, and the two busbars are electrically connected with the battery cell.

Optionally, the battery pack further comprises two insulating plates, the two insulating plates are arranged in the shell, the two insulating plates are respectively located at two ends of the battery pack along the length direction of the bottom plate, and the two busbars are respectively arranged on the two insulating plates.

Optionally, the battery further comprises a wire harness, the wire harness is arranged in the casing, and the wire harness is used for collecting voltage and temperature signals of the battery core.

Optionally, the casing includes two module end covers, two the module end cover is located respectively the casing is followed bottom plate length direction's both ends, two all be provided with the hole for hoist on the module end cover.

The utility model has the beneficial effects that:

the utility model provides a battery module, which comprises a shell, N liquid cooling plates and N +1 electric core groups. Wherein, the casing includes the bottom plate, and the parallel interval of N liquid cooling board sets up on the bottom plate, and the face of N liquid cooling board all sets up with the face of bottom plate is perpendicular. N liquid cooling boards and the shell form N +1 cavities, and N is a positive integer. The N +1 electric core groups are respectively arranged in the N +1 cavities. The battery core in the battery core group can directly transmit heat to the heat transfer medium in the liquid cooling plate, the heat transfer path is greatly shortened, and the heat can be timely transmitted to the outside of the battery module along with the flow of the heat transfer medium. The liquid cooling plate can also be used as a partition between adjacent electric core groups to avoid looseness and mutual impact, and is favorable for protecting the electric core groups. And when the temperature of one electric core group rises abnormally, the arrangement of the liquid cooling plate can also avoid the heat transfer between the electric core groups, thereby reducing the danger degree. Compare in the bottom with the liquid cooling board setting at battery module, the design of liquid cooling board more is favorable to improving the space utilization of liquid cooling board in this application, promotes battery module's volume energy density. Every electric core group of this battery module includes a plurality of electric cores and a plurality of bolster, and every bolster setting is favorable to protecting electric core between adjacent electric core, absorbs the deformation that electric core inflation caused. Therefore, the battery module can shorten the radiating heat dissipation path of the battery core, improve the heat dissipation rate, avoid heat accumulation, improve the space utilization rate of the liquid cooling plate and improve the volume energy density of the battery module.

Drawings

Fig. 1 is a schematic structural diagram of a battery module according to an embodiment of the present invention;

fig. 2 is an exploded view of a battery module according to an embodiment of the present invention;

fig. 3 is a sectional view of a battery module according to an embodiment of the present invention.

In the figure:

1. a housing; 11. a bottom case; 111. a base plate; 12. a module end cover; 13. a module upper cover;

2. a liquid-cooled plate; 21. a water inlet; 22. a water outlet; 23. a flow channel;

3. the electric core group; 31. an electric core; 32. a buffer member;

4. heat conducting glue; 5. a thermally insulating sheet; 6. an insulating plate; 7. a module top cover; 8. a wire harness.

Detailed Description

The technical scheme of the utility model is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Current soft packet of lithium ion battery module adopts monomer electric core longitudinal arrangement's structure usually, sets up liquid cooling board 2 and dispels the heat to the battery module bottom the box. This structure increases a heat dissipation path for dissipating heat from the battery cell 31, which is not favorable for dissipating heat from the battery cell 31. On the other hand, set up liquid cold drawing 2 in bottom half and reduced the utilization ratio in battery module high space, be unfavorable for promoting the volume energy density of battery module. Therefore, the present embodiment provides a battery module to solve the above problems.

As shown in fig. 1 to fig. 3, the battery module provided in this embodiment includes a housing 1, N liquid-cooling plates 2, and N +1 electric core groups 3. Wherein, casing 1 includes bottom plate 111, and the parallel interval of N liquid cooling plate 2 sets up on bottom plate 111, and the face of N liquid cooling plate 2 all sets up with bottom plate 111's face is perpendicular. N liquid cooling plate 2 and casing 1 form N +1 cavity, and N is the positive integer. The N +1 electric core groups 3 are respectively arranged in the N +1 cavities. The electric core 31 in the electric core group 3 can directly transmit the heat to the heat transfer medium in the liquid cooling plate 2, the heat transfer path is greatly shortened, and the heat can be timely transmitted to the outside of the battery module along with the flow of the heat transfer medium. The liquid cooling plate 2 can also be used as a partition between the adjacent electric core groups 3 to avoid looseness and mutual impact, and is favorable for protecting the electric core groups 3. And when the temperature of one electric core group 3 rises abnormally, the arrangement of the liquid cooling plate 2 can also reduce the heat transfer between the electric core groups 3, and delay the time of thermal runaway of other electric core groups 3, thereby prolonging the escape time of users. Compare in the bottom that sets up at battery module with liquid cooling board 2, liquid cooling board 2's design more is favorable to improving liquid cooling board 2's space utilization in this application, promotes battery module's volume energy density. Every electric core group 3 of this battery module includes a plurality of electric cores 31 and a plurality of bolster 32, and every bolster 32 sets up between adjacent electric core 31, is favorable to protecting electric core 31, absorbs the deformation that electric core 31 inflation caused. Therefore, this battery module can shorten the radiating heat dissipation route of electricity core 31, improves rate of heat dissipation, avoids the heat to gather, can also improve the space utilization of liquid cooling board 2, promotes battery module's volume energy density.

In order to increase the heat exchange area and improve the heat exchange efficiency, optionally, the length direction of the liquid cooling plate 2 is consistent with the length direction of the bottom plate 111, i.e. the liquid cooling plate 2 and the larger side face of the electric core assembly 3 are contacted for heat exchange. Optionally, the length direction of the flow channel 23 in the liquid cooling plate 2 is the same as the length direction of the liquid cooling plate 2, that is, the length of the flow channel 23 is far greater than the width, which is beneficial to ensuring the flow speed of the heat transfer medium, thereby improving the heat exchange efficiency.

In order to minimize the volume of the battery module and increase the volumetric energy density thereof, the water inlet 21 and the water outlet 22 of the liquid cooling plate 2 are optionally located at the same end.

In order to further reduce the width of the flow channel 23, ensure the flow speed of the heat transfer medium, and avoid the temperature difference caused by the flow dead angle, optionally, a plurality of flow channels 23 are arranged in the liquid cooling plate 2. And in order to ensure that each cell 31 can obtain good heat exchange, each cell 31 is in contact with one or more flow channels 23.

In order to avoid the local gap between the liquid cooling plate 2 and the electric core 31 and the difficulty in heat transfer, optionally, the liquid cooling plate further comprises a heat conducting glue 4, and the heat conducting glue 4 is filled in the gap between the N +1 electric core sets 3, the N liquid cooling plates 2 and the inner wall surface of the shell 1. Certainly, set up the position that heat-conducting glue 4 can also effectively fix electric core group 3 and liquid cooling board 2 in casing 1, avoid not hard up damage that causes.

Optionally, the battery module further comprises a heat insulation sheet 5, wherein the heat insulation sheet 5 is disposed between the casing 1 and the electric core set 3. The heat-insulating sheet 5 not only plays an insulating role, but also can prevent external heat from entering through the side face of the shell 1, and can prevent the heat from being transmitted to the outside when the module itself is out of control, and damage surrounding objects.

Optionally, the battery module further includes two busbars, the two busbars are disposed in the casing 1, the two busbars are respectively located at two ends of the electric core set 3 along the length direction of the bottom plate 111, and the two busbars are electrically connected to the electric core 31 to implement series-parallel connection of the electric core 31.

Optionally, the battery module further includes two insulating plates 6, the two insulating plates 6 are disposed in the housing 1, the two insulating plates 6 are respectively located at two ends of the electric core group 3 along the length direction of the bottom plate 111, and the two bus bars are respectively disposed on the two insulating plates 6.

Optionally, the battery module further comprises two module top covers 7, and the module top covers 7 are used for protecting the tabs of the battery cells 31 and have an insulating effect. Specifically, one module top cover 7 is located between the insulating plate 6 and the module end cover 12 on one side of the electric core group 3, and the other top cover is located between the insulating plate 6 and the module end cover 12 on the other side of the electric core group 3.

Optionally, the battery module further includes a wire harness 8, the wire harness 8 is disposed in the housing 1, and the wire harness 8 is configured to collect voltage and temperature signals of the battery cell 31, and feed the voltage and temperature signals back to a management system of the battery module, so that a user can know the voltage and temperature of the battery cell 31.

Optionally, the housing 1 comprises a bottom shell 11 with a U-shaped cross-section, two module end caps 12 and one module top cap 13. The bottom case 11 includes a bottom plate 111 and two side plates disposed opposite to each other. The two module end covers 12 are respectively located at two ends of the housing 1 along the length direction of the bottom plate 111, that is, at two ends of the side plates. The module end cover 12 and two side plates of the bottom case 11 constitute four side surfaces of the housing 1. Optionally, hoisting holes are formed in the two module end covers 12, so that the battery modules can be conveniently transported.

Optionally, N is 1 in this embodiment, and in other embodiments, N may be any positive integer greater than 1 according to the specification of the battery module.

In this embodiment, the liquid cooling plate 2 is disposed in the middle of the bottom plate 111, and divides the interior of the housing 1 into two cavities, and two electric core sets 3 are disposed respectively. The heat conduction path between the battery cell 31 and the liquid cooling plate 2 is simplified from the battery cell 31, the heat conduction glue 4, the module bottom case 11, the heat conduction pad and the liquid cooling plate 2 to the battery cell 31, the heat conduction glue 4 and the liquid cooling plate 2, so that the heat conduction path is greatly shortened, and the heat dissipation effect of the liquid cooling plate 2 on the battery cell 31 is improved. Therefore, the battery module can improve the heat dissipation rate, avoid heat accumulation and improve the safety of the battery module. And the setting position of the liquid cooling plate 2 of the battery module can also improve the space utilization rate of the liquid cooling plate 2, and the volume energy density of the battery module is improved.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery module, comprising:

a housing (1), said housing (1) comprising a base plate (111);

the liquid cooling plates (2) are arranged on the bottom plate (111) in parallel at intervals, the plate surfaces of the liquid cooling plates (2) are perpendicular to the plate surface of the bottom plate (111), the liquid cooling plates (2) and the shell (1) form N +1 cavities, and N is a positive integer;

n +1 electric core group (3), N +1 electric core group (3) set up respectively in N +1 in the cavity, every electric core group (3) include a plurality of electric cores (31) and a plurality of bolster (32), every bolster (32) set up adjacently between electric core (31).

2. The battery module according to claim 1, wherein the length direction of the liquid cooling plate (2) is identical to the length direction of the bottom plate (111), and the length direction of the flow channel (23) in the liquid cooling plate (2) is identical to the length direction of the liquid cooling plate (2).

3. The battery module according to claim 1, wherein the water inlet (21) and the water outlet (22) of the liquid-cooled plate (2) are located at the same end.

4. The battery module according to claim 1, wherein a plurality of flow channels (23) are arranged in the liquid cooling plate (2), and each cell (31) is in contact with one or more flow channels (23).

5. The battery module according to claim 1, further comprising a heat conductive adhesive (4), wherein the heat conductive adhesive (4) is filled in the gap among the electric core assembly (3), the liquid cooling plate (2) and the inner wall of the housing (1) in the cavity.

6. The battery module according to claim 1, further comprising a thermally insulating sheet (5), wherein the thermally insulating sheet (5) is disposed between the housing (1) and the electric core pack (3).

7. The battery module according to claim 1, further comprising two bus bars disposed in the housing (1), wherein the two bus bars are respectively located at two ends of the electric core group (3) along the length direction of the bottom plate (111), and the two bus bars are electrically connected with the electric cores (31).

8. The battery module according to claim 7, further comprising two insulating plates (6), wherein the two insulating plates (6) are disposed in the housing (1), the two insulating plates (6) are respectively located at two ends of the electric core assembly (3) along the length direction of the bottom plate (111), and the two bus bars are respectively disposed on the two insulating plates (6).

9. The battery module according to claim 1, further comprising a wiring harness (8), wherein the wiring harness (8) is disposed in the housing (1), and the wiring harness (8) is used for collecting voltage and temperature signals of the battery cells (31).

10. The battery module according to claim 1, wherein the housing (1) comprises two module end covers (12), the two module end covers (12) are respectively located at two ends of the housing (1) along the length direction of the bottom plate (111), and hoisting holes are formed in each of the two module end covers (12).