CN220290979U

CN220290979U - Battery module and battery pack

Info

Publication number: CN220290979U
Application number: CN202321820950.XU
Authority: CN
Inventors: 古展彰; 林鸿明; 郜旭辉; 刘华俊
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2023-07-12
Filing date: 2023-07-12
Publication date: 2024-01-02
Anticipated expiration: 2033-07-12

Abstract

The utility model relates to the technical field of batteries, in particular to a battery module and a battery pack. The battery module comprises a box body, an electric core group and a partition plate, wherein an inlet and an outlet for cooling liquid to enter and exit are formed in the box body. The baffle sets up in the top of electric core group and separates into the cavity and the lower cavity that holds electric core group with box inside, goes up the cavity and communicates with the import, and lower cavity and export intercommunication, go up the cavity and the cavity communicates with forming the U-shaped chamber down. The battery pack comprises the battery module, and the cooling liquid cools the top end and the peripheral side of the battery cell respectively, so that large-area cooling is realized, and the cooling effect is improved. Meanwhile, the flowing directions of the cooling liquid are opposite to each other in the upper cavity and the lower cavity, the temperature of the cooling liquid is gradually increased along with the flowing of the cooling liquid, the overall cooling effect of the top end and the periphery of each battery cell is approximately the same, uniform cooling of each battery cell is realized, and the temperature uniformity of the battery cell group is ensured.

Description

Battery module and battery pack

Technical Field

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

Background

Along with the charge rate of the power battery on the electric vehicle is higher and higher, in order to meet the quick charge requirement of larger multiplying power, the power battery is cooled by adopting immersed liquid cooling, namely, nonconductive cooling liquid is led into the box body of the battery module, so that the battery cells in the box body are all immersed in the cooling liquid, and large-area cooling is realized.

In the existing immersed liquid cooling battery module, cooling liquid flows in from one side of the battery module and flows out from the other side of the battery module after passing through a plurality of battery cells. After the cooling liquid enters the battery module, the temperature difference between the cooling liquid before heating and the battery cell close to the inflow side is large, and the cooling effect is good. Along with the flow of the cooling liquid and the absorption of the heat emitted by the battery cells, the temperature of the battery cells near the outflow side gradually rises, so that the temperature difference between the battery cells near the outflow side and the warmed cooling liquid gradually becomes smaller, the cooling effect is reduced, the temperature distribution of each battery cell in the battery module is uneven, and the normal use of the battery module is affected.

Disclosure of Invention

The utility model aims to provide a battery module and a battery pack, which are used for solving the problem that the temperature distribution of a battery cell is uneven in a submerged cooling mode of the battery module in the prior art.

The technical scheme adopted by the utility model is as follows:

a battery module, comprising:

the box body is provided with an inlet and an outlet for cooling liquid to enter and exit;

the battery cell group and the baffle, the baffle set up in the top of battery cell group and with box inside partition becomes cavity and holding down the cavity of battery cell group, go up the cavity with the import intercommunication, down the cavity with the export intercommunication, go up the cavity with the cavity intercommunication is in order to form the U-shaped chamber down.

Most preferably, the case includes:

the baffle sealing cover is arranged at the opening end of the lower shell so as to enclose the lower cavity with the lower shell;

and the upper cover is sealed at the opening end of the lower shell so that the upper cover and the partition board enclose the upper cavity.

Most preferably, a lower flow passage is formed in the first side wall of the lower shell, and the upper cavity is communicated with the lower cavity through the lower flow passage.

Most preferably, the lower flow channel comprises a plurality of first branch flow channels, the first side walls are arranged at intervals along the width direction of the first side walls, one end of each first branch flow channel penetrates through the top end of each first side wall and is communicated with the upper cavity, and the other end of each first branch flow channel is communicated with the lower cavity.

Most preferably, an upper runner is provided on a second side wall of the lower housing opposite to the first side wall, one end of the upper runner penetrates through the top end of the second side wall and is communicated with the upper cavity, and the other end of the upper runner is communicated with the inlet.

Most preferably, the upper flow passage comprises a plurality of second branch flow passages, the second side walls are provided with a plurality of second branch flow passages at intervals along the width direction, one end of each second branch flow passage penetrates through the top end of each second side wall and is communicated with the upper cavity, and the other end of each second branch flow passage is communicated with the inlet.

Most preferably, the inlet and the outlet are arranged on the second side wall at intervals up and down.

Most preferably, the battery module further comprises a CCS assembly, the CCS assembly is disposed at the top end of the battery cell group, the plurality of battery cells of the battery cell group are electrically connected through the CCS assembly, and the separator is disposed on the CCS assembly.

Most preferably, the separator is bonded to the upper end of the CCS assembly.

The battery pack comprises the battery module.

The beneficial effects of the utility model are as follows:

according to the battery module provided by the utility model, the inner part of the box body is divided into the upper cavity and the lower cavity by the partition plate, and the upper cavity is communicated with the same side of the lower cavity to form the U-shaped cavity. The cooling liquid enters the upper cavity from the inlet to cool the top end with larger heating value of the battery cell group, and then flows into the lower cavity to cool the peripheral sides of all battery cells of the battery cell group. The cooling liquid cools the top end and the peripheral side of the battery cell respectively, so that large-area cooling is realized, and the cooling effect is improved. Meanwhile, the flowing directions of the cooling liquid are opposite to each other in the upper cavity and the lower cavity, the temperature of the cooling liquid is gradually increased along with the flowing of the cooling liquid, the overall cooling effect of the top end and the periphery of each battery cell is approximately the same, uniform cooling of each battery cell is realized, and the temperature uniformity of the battery cell group is ensured.

The battery pack provided by the utility model comprises the battery module, so that large-area cooling is realized, and the high-rate quick charge requirement is met. The flow directions of the cooling liquid are opposite in the upper cavity and the lower cavity, the temperature is gradually increased along with the flow of the cooling liquid, the overall cooling effect of the top end and the periphery of each battery cell is approximately the same, uniform cooling of each battery cell is realized, and the temperature uniformity of the battery cell group is ensured.

Drawings

Fig. 1 is a schematic exploded view of a battery module according to an embodiment of the present utility model;

FIG. 2 is a front view of a flow path of a cooling liquid according to an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of a flow path of a cooling liquid according to an embodiment of the present utility model.

The parts in the figures are named and numbered as follows:

1. a case; 11. a lower housing; 110. a lower cavity; 111. a second sidewall; 112. an inlet; 113. an outlet; 114. an upper flow passage; 1141. a second branch flow passage; 115. a lower flow passage; 12. an upper cover; 120. an upper cavity; 2. a cell group; 3. a partition plate; 4. CCS components.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present utility model are shown.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

As shown in fig. 1, the present embodiment proposes a battery module including a case 1, a battery cell group 2, a separator 3, and a CCS assembly 4, the battery cell group 2 including a plurality of battery cells arranged in an array. The CCS assembly 4 is disposed at the top end of the battery cell group 2, and a plurality of battery cells of the battery cell group 2 are electrically connected through the CCS assembly 4. The partition 3 is provided on the CCS assembly 4 to realize insulation between the CCS assembly 4 and the cabinet 1.

Specifically, CCS assembly 4 includes a support plate and a busbar, the support plate being disposed at the axial top end of the cell. The busbar sets up in the backup pad, and a plurality of electric cores pass through the busbar electricity and connect and form electric core group 2. Of course, the CCS assembly 4 may further include an FRC flexible board and a collecting piece, where the FPC flexible board is welded with the corresponding collecting piece, so as to collect parameters such as temperature and pressure of each battery cell. Since CCS component 4 is prior art, it is not described in detail herein.

The battery cell of this embodiment is the cylinder battery cell, exists great clearance between each cylinder battery cell, provides the flow space for the coolant liquid. Moreover, compared with a square aluminum shell battery cell structure, the cylindrical battery cell of the embodiment is free from expansion in the radial direction, so that the flowing space of the cooling liquid is not compressed, and the battery cell in the box body 1 is immersed in the cooling liquid in an immersed cooling mode, so that large-area cooling is realized.

After the cooling liquid enters the battery module, the temperature difference between the cooling liquid before heating and the battery cell close to the inflow side is large, and the cooling effect is good. Along with the flow of the cooling liquid and the absorption of the heat emitted by the battery cells, the temperature of the battery cells near the outflow side gradually rises, so that the temperature difference between the battery cells near the outflow side and the warmed cooling liquid gradually becomes smaller, the cooling effect is reduced, the temperature distribution of each battery cell is uneven, and the normal use of the battery module is affected.

In order to solve the above problems, as shown in fig. 1 and 2, the case 1 of the present embodiment is provided with an inlet 112 and an outlet 113 for the coolant. The baffle 3 is arranged at the top end of the battery cell group 2 and divides the interior of the box body 1 into an upper cavity 120 and a lower cavity 110 containing the battery cell group 2, the upper cavity 120 is communicated with the inlet 112, the lower cavity 110 is communicated with the outlet 113, and the upper cavity 120 is communicated with the lower cavity 110 to form a U-shaped cavity. The cooling liquid enters the upper cavity 120 from the inlet 112 to cool the top end with larger heating value of the battery cell group 2, and then flows into the lower cavity 110 to cool the peripheral sides of each battery cell of the battery cell group 2. The flow directions of the cooling liquid are opposite in the upper cavity 120 and the lower cavity 110, and the temperature of the cooling liquid is gradually raised, so that the overall cooling effect of the top end and the periphery of each battery cell is approximately the same, uniform cooling of each battery cell is realized, and the temperature uniformity of the battery cell group 2 is ensured.

It should be noted that the axial heat conduction capability of the cylindrical battery cell is greater than the radial heat conduction capability thereof. Namely, the heat dissipation effect of the two axial ends of the cylindrical battery cell is better than that of the cylindrical battery cell in the circumferential direction. The top of electric core group 2 is pressed close to in baffle 3 for coolant liquid in the upper chamber 120 carries out the cooling to the top of the great electric core of heat dissipation capacity at first, has improved cooling effect. Moreover, the higher the temperature of the cooling liquid of the upper cavity 120 corresponding to the top end of each cell (the better the cooling effect), the lower the temperature of the cooling liquid of the lower cavity 110 corresponding to the cell (the worse the cooling effect), so that the cooling effect of the whole of each cell is approximately the same.

As shown in fig. 1, the case 1 includes a lower housing 11 and an upper cover 12, and a partition plate 3 is sealed to the open end of the lower housing 11 such that the partition plate 3 and the lower housing 11 enclose a lower cavity 110. The upper cover 12 is sealed to the open end of the lower housing 11 such that the upper cover 12 and the partition 3 enclose an upper cavity 120. The bottom surface of the upper cover 12 is concavely provided with a cavity, and the partition board 3 seals the cavity to form an upper cavity 120.

Specifically, the CCS assembly 4 and the top end of the battery cell group 2 are assembled into a whole by gluing, and the separator 3 is adhered to the upper end of the CCS assembly 4, so that the battery cell group 2, the separator 3 and the CCS assembly 4 are adhered and connected. The opening ends of the partition plate 3 and the lower housing 11 are sealed by glue, so that the lower cavity 110 is a sealed cavity, and leakage of the cooling liquid is avoided. Meanwhile, a glue groove is formed in the top end of the lower shell 11 in a surrounding mode, sealing glue is filled in the glue groove, sealing assembly is achieved between the lower shell 11 and the upper cover 12 through the sealing glue in the glue groove, and therefore the upper cavity 120 is a sealing cavity as well, and leakage of cooling liquid is avoided.

In this embodiment, the top ends of the individual cells in the cell group 2 are substantially wrapped in the glue layer on the CCS assembly 4. When the cooling liquid flows into the lower cavity 110, the peripheral sides of the battery cells are immersed in the cooling liquid, so that the cooling liquid in the lower cavity 110 mainly cools the peripheral sides of the battery cells.

As shown in fig. 1, the inlet 112 and the outlet 113 are disposed on the second sidewall 111 at a vertical interval, so that the distribution of the inlet 112 and the outlet 113 is more compact.

As shown in fig. 1 and 2, the first side wall of the lower housing 11 is disposed opposite to the second side wall 111, and the first side wall is provided with a lower flow channel 115, and the upper cavity 120 is communicated with the lower cavity 110 through the lower flow channel 115 to form a U-shaped cavity. An upper flow passage 114 is formed in the second side wall 111 of the lower housing 11, one end of the upper flow passage 114 penetrates through the top end of the second side wall 111 and is communicated with the upper cavity 120, and the other end of the upper flow passage 114 is communicated with the inlet 112.

Further, as shown in fig. 3, the lower flow channel 115 includes a plurality of first branch flow channels, the first side walls are spaced apart along the width direction thereof, a plurality of first branch flow channels are provided on the first side walls, one end of each first branch flow channel penetrates through the top end of the first side wall and is communicated with the upper cavity 120, and the other end of each first branch flow channel is communicated with the lower cavity 110. The upper cavity 120 is communicated with the lower cavity 110 through a plurality of first branch flow passages, so that the cooling liquid uniformly flows into the lower cavity 110 through the plurality of first branch flow passages, and the uniform flow of the cooling liquid in the lower cavity 110 is realized. And a plurality of first branch flow passages are arranged at intervals, so that the size of each first branch flow passage is reduced, the processing is convenient, and meanwhile, the structural strength of the first side wall is ensured.

Further, as shown in fig. 3, the upper flow channel 114 includes a plurality of second sub flow channels 1141, the second side walls 111 are provided with a plurality of second sub flow channels 1141 at intervals along the width direction thereof, one end of each second sub flow channel 1141 penetrates through the top end of the second side wall 111 and communicates with the upper cavity 120, and the other end of each second sub flow channel 1141 communicates with the inlet 112. The external cooling liquid uniformly flows into the upper chamber 120 through the plurality of second sub-passages 1141, and uniform flow of the cooling liquid in the upper chamber 120 is achieved. And the plurality of second branch flow passages 1141 are arranged at intervals, so that the size of each second branch flow passage 1141 is reduced, the processing is convenient, and the structural strength of the second side wall 111 is ensured.

As shown in fig. 3, the second side wall 111 is provided with a plurality of third sub-channels spaced apart in a width direction thereof, and the lower chamber 110 communicates with the outlet 113 through the plurality of third sub-channels so that the cooling liquid in the lower chamber 110 uniformly flows into the outlet 113. The plurality of third branch flow passages are arranged at intervals, so that the size of each third branch flow passage is reduced, the processing is convenient, and meanwhile, the structural strength of the second side wall 111 is ensured.

The embodiment also provides a battery pack, which comprises the battery module, and realizes large-area cooling of the battery cell group 2 in a submerged cooling mode so as to meet the high-rate quick-charge requirement. The flow directions of the cooling liquid are opposite in the upper cavity 120 and the lower cavity 110, and the temperature of the cooling liquid is gradually raised, so that the overall cooling effect of the top end and the periphery of each battery cell is approximately the same, uniform cooling of each battery cell is realized, and the temperature uniformity of the battery cell group 2 is ensured.

The above embodiments merely illustrate the basic principle and features of the present utility model, and the present utility model is not limited to the above embodiments, but may be varied and altered without departing from the spirit and scope of the present utility model. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The battery module, its characterized in that includes:

the device comprises a box body (1), wherein an inlet (112) and an outlet (113) for cooling liquid to enter and exit are formed in the box body (1);

electric core group (2) and baffle (3), baffle (3) set up in the top of electric core group (2) and will box (1) internal partition becomes cavity (120) and holding down cavity (110) of electric core group (2), go up cavity (120) with import (112) intercommunication, cavity (110) down with export (113) intercommunication, go up cavity (120) with cavity (110) intercommunication down in order to form the U-shaped chamber.

2. The battery module according to claim 1, wherein the case (1) includes:

the baffle (3) is sealed and arranged at the opening end of the lower shell (11) so as to form the lower cavity (110) together with the lower shell (11);

and an upper cover (12) which is sealed at the opening end of the lower shell (11) so that the upper cover (12) and the partition board (3) enclose an upper cavity (120).

3. The battery module according to claim 2, wherein a lower flow passage (115) is opened at a first side wall of the lower case (11), and the upper cavity (120) and the lower cavity (110) communicate through the lower flow passage (115).

4. A battery module according to claim 3, wherein the lower flow channel (115) includes a plurality of first branch flow channels, the first side walls are provided with a plurality of first branch flow channels at intervals along the width direction thereof, one end of each first branch flow channel penetrates through the top end of the first side wall and communicates with the upper cavity (120), and the other end of each first branch flow channel communicates with the lower cavity (110).

5. A battery module according to claim 3, wherein an upper flow passage (114) is provided in a second side wall (111) of the lower case (11) opposite to the first side wall, one end of the upper flow passage (114) penetrates through the top end of the second side wall (111) and communicates with the upper cavity (120), and the other end of the upper flow passage (114) communicates with the inlet (112).

6. The battery module according to claim 5, wherein the upper flow channel (114) includes a plurality of second branch flow channels (1141), the second side walls (111) are provided with a plurality of second branch flow channels (1141) at intervals along the width direction thereof, one end of each second branch flow channel (1141) penetrates through the top end of the second side wall (111) and communicates with the upper cavity (120), and the other end of each second branch flow channel (1141) communicates with the inlet (112).

7. The battery module according to claim 5, wherein the inlet (112) and the outlet (113) are provided on the second side wall (111) at an up-down interval.

8. The battery module according to any one of claims 1 to 7, further comprising a CCS assembly (4), the CCS assembly (4) being disposed at a top end of the battery cell group (2), a plurality of battery cells of the battery cell group (2) being electrically connected by the CCS assembly (4), the separator (3) being disposed on the CCS assembly (4).

9. The battery module according to claim 8, wherein the separator (3) is adhered to an upper end of the CCS assembly (4).

10. A battery pack, characterized in that the battery pack comprises the battery module according to any one of claims 1 to 9.