CN112787030B

CN112787030B - Battery cell unit and power battery module

Info

Publication number: CN112787030B
Application number: CN202110086548.2A
Authority: CN
Inventors: 侯汉彬; 程骞; 沈炳杰; 李晨
Original assignee: Gotion High Tech Co Ltd
Current assignee: Gotion High Tech Co Ltd
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2022-09-09
Anticipated expiration: 2041-01-22
Also published as: CN112787030A

Abstract

The invention provides a battery cell and a power battery module, which comprise: the two side plates are oppositely arranged, and each side plate is provided with a first fluid channel which is opened outwards; the battery cell units are arranged between the two side plates; the battery cell unit comprises a shell and a battery core body arranged in the shell; a cooling flow channel is arranged on the bottom wall of the shell; a first opening and a second opening are respectively arranged at the two ends of the cooling flow channel; one of the first opening and the second opening of the adjacent cell units is communicated with the other one of the first opening and the second opening when the cell units are stacked, so that the cooling flow channels in the plurality of cell units are communicated to form a second fluid channel; two ends of the second fluid channel are respectively communicated with the two first fluid channels. The invention provides a battery cell unit and a power battery module, which can cool a battery without reducing grouping efficiency, and simultaneously save heat conduction materials, thereby reducing cost, reducing thermal resistance and improving cycle life and performance of a battery cell.

Description

Battery cell unit and power battery module

Technical Field

The invention relates to a battery cell and a power battery module.

Background

The development of new energy automobiles is an urgent task in the world today. The power battery system is the most important component in the new energy automobile, wherein the thermal management performance of the power battery system is crucial to the safety of the power battery pack. With the increasing size and capacity of the current battery cell, the upgrading of the cooling system in the power battery system is more necessary. The cooling system used at present for the square electric core is in a liquid cooling mode. Specifically, the cooling system is generally a sandwich structure, i.e., a structure in which the electric core is provided with a heat conducting pad (or a heat conducting glue) and a cold plate. Because the cooling system has the heat-conducting glue or the heat-conducting pad which is thermal resistance, the aging heat-conducting capability of the material is reduced and the thermal resistance is increased along with the passage of time, thereby further influencing the cooling effect of the cooling system.

Therefore, it is necessary to provide a battery cell unit and a power battery module to solve the above problems.

Disclosure of Invention

The invention aims to provide a battery cell unit and a power battery module, which can cool batteries without reducing grouping efficiency, and simultaneously save heat conducting materials, thereby reducing cost, reducing thermal resistance and improving cycle life and performance of a battery cell.

The above object of the present invention can be achieved by the following technical solutions: a power battery module, it includes: the two side plates are oppositely arranged, and each side plate is provided with a first fluid channel which is opened outwards; the battery cell units are arranged between the two side plates; the battery cell unit comprises a shell and an electric core body arranged in the shell; a cooling flow channel is arranged on the bottom wall of the shell; a first opening and a second opening are respectively arranged at two ends of the cooling flow channel; the cooling flow channel is used for cooling the electric core body; one of the first opening and the second opening of the adjacent cell units is communicated with the other one when the cell units are stacked, so that the cooling flow channels in the plurality of cell units are communicated to form a second fluid channel; and two ends of the second fluid channel are respectively communicated with the two first fluid channels.

As a preferred embodiment, a first plug-in part, a flow channel part and a first matching part are arranged on the bottom wall of the shell; the cooling flow channel is arranged on the flow channel part; the first insertion part is inserted and matched with the first matching part, so that one of the first opening and the second opening of the adjacent battery cell unit is butted with the other opening.

As a preferred embodiment, the cooling flow channel extends in the stacking direction of the cell units and penetrates the flow channel portion.

As a preferred embodiment, the first plugging portion, the flow channel portion, and the first matching portion are arranged in sequence along the stacking direction of the battery cell units.

As a preferred embodiment, the bottom wall includes a bottom plate and a convex portion provided at one end of the bottom plate; the bulge part is from the bottom plate is towards the inside protrusion of electrical core, just the bulge part forms the runner portion.

As a preferred embodiment, two opposite first plug-in walls are further provided on the other end of the bottom plate; the boss has a first stop surface facing the first plug wall; a groove which is opened upwards is formed among the two first plug-in walls, the first stop surface and the bottom plate; the groove forms the first mating portion.

In a preferred embodiment, the protrusion includes an extension extending from the bottom plate in a direction away from the first plug portion; the first matching part is arranged on the extending part.

As a preferred embodiment, the first mating portion includes a second stop surface, a first mating surface, and a first abutting surface; the second stop surface is positioned on one side of the extension part, which is opposite to the first stop surface; the two first matching surfaces are oppositely arranged on the extension part; the first abutting surface is positioned on one side, far away from the electric core, of the extension part; the second stop surface, the first mating surface and the first abutting surface are respectively used for abutting against the first stop surface, the first plug wall and the bottom plate of the adjacent battery cell unit.

As a preferred embodiment, the cell units are stacked in a thickness direction of the electrical core, and the cooling flow channel extends in the thickness direction of the electrical core; the two side plates are oppositely arranged along the thickness direction of the electric core body.

A cell unit, comprising: a housing; a cooling flow passage is arranged on the cooling device; a first opening and a second opening are respectively arranged at two ends of the cooling flow channel; an electrical core; disposed within the housing; the cooling flow channel is used for cooling the electric core body.

The application provides a battery electricity core's beneficial effect is: the battery cell unit and the power battery module are provided with the first fluid channel and the cooling flow channel; a first opening and a second opening are respectively arranged at the two ends of the cooling flow channel; one of the first opening and the second opening of the adjacent battery cell units is communicated with the other one of the first opening and the second opening when the battery cell units are stacked, so that the cooling flow channels in the plurality of battery cell units are communicated to form a second fluid channel; the two ends of the second fluid channel are respectively communicated with the two first fluid channels. So this application embodiment power battery module need not heat conduction pad or heat conduction and glues, and then saves heat conduction material, reduce cost, reduces the thermal resistance, improves the life cycle and the performance of electric core. Simultaneously because the cooling flow channel sets up on the diapire of electric core unit shell, so add the sandwich structure that the heat conduction was glued to heat pad (or heat conduction) with the cold plate for current electric core, the power battery module of this application does not occupy the space of electric core unit on the direction of piling up of electric core unit, and then can realize the cooling to the battery when not reducing efficiency in groups. Therefore, the invention provides a battery cell unit and a power battery module, which can cool batteries without reducing grouping efficiency, and simultaneously save heat conducting materials, thereby reducing cost, reducing thermal resistance, and improving cycle life and performance of a battery cell.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is an isometric view of a power battery module provided in an embodiment of the present application;

fig. 2 is a cooling view of a power battery module according to an embodiment of the present disclosure;

fig. 3 is an axial view of a cell unit provided in an embodiment of the present application;

fig. 4 is an exploded view of a cell unit provided in an embodiment of the present application;

FIG. 5 is a schematic view of a bottom wall structure of an enclosure according to an embodiment of the present application;

fig. 6 is a schematic diagram illustrating connection of a plurality of battery cell units and a side plate according to an embodiment of the present application;

fig. 7 is an assembly diagram of a power battery module according to an embodiment of the present disclosure.

Description of the reference numerals:

13. a first side plate; 14. a second side plate; 15. a first fluid channel; 17. a second fluid passage; 19. a cell unit; 21. a housing; 22. a first opening; 25. a second opening; 27. a cooling flow channel; 31. a first insertion part; 33. a runner section; 35. a base plate; 37. a first socket wall; 39. a first stop surface; 41. an extension portion; 43. a second stop surface; 45. a first mating surface; 47. a first abutting surface; 49. a body portion; 51. a cooling section; 53. a raised body; 55. a top wall; 57. a housing body; 59. a bottom wall.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Please refer to fig. 1 to 7. The application provides a power battery module, it can include: two oppositely arranged side plates, wherein each side plate is provided with a first fluid channel 15 which is opened outwards; a plurality of cell units 19 disposed between the two side plates; the cell unit 19 includes a casing 21 and an electric core body disposed inside the casing 21; a cooling flow channel 27 is arranged on the bottom wall 59 of the shell 21; a first opening 22 and a second opening 25 are respectively arranged at two ends of the cooling flow channel 27; the cooling flow channel 27 is used for cooling the electric core; one of the first opening 22 and the second opening 25 of the adjacent cell units 19 is communicated with the other when the cell units 19 are stacked, so that the cooling flow channels 27 in the plurality of cell units 19 are communicated to form the second fluid channel 17; both ends of the second fluid passage 17 communicate with the two first fluid passages 15, respectively.

It can be seen from the above technical solutions that: the power battery module according to the embodiment of the present application is provided with the first fluid channel 15 and the cooling channel 27; a first opening 22 and a second opening 25 are respectively arranged at two ends of the cooling flow channel 27; one of the first opening 22 and the second opening 25 of the adjacent cell units 19 is communicated with the other when the cell units 19 are stacked, so that the cooling flow channels 27 in the plurality of cell units 19 are communicated to form the second fluid channel 17; both ends of the second fluid passage 17 communicate with the two first fluid passages 15, respectively. So this application embodiment power battery module need not heat conduction pad or heat conduction and glues, and then saves heat conduction material, reduce cost, reduces the thermal resistance, improves the life cycle and the performance of electric core. Because cooling flow channel 27 sets up on the diapire 59 of electric core unit 19 shell 21 simultaneously, so add the sandwich structure that the heat conduction was glued to the heat conduction pad (or heat conduction) with the cold plate for current electric core, the power battery module of this application does not occupy electric core unit 19's space on electric core unit 19's the direction of piling up, and then can realize the cooling to the battery when not reducing efficiency in groups.

In the present embodiment, the two side plates are disposed opposite to each other. For example, as shown in fig. 1, the two side plates are opposed substantially in the left-right direction. In particular, the two side panels may be a first side panel 13 on the left side and a second side panel 14 on the right side. Further, each side plate is provided with a first fluid passage 15 opened outwardly. So that the outside fluid can be input into the first fluid channel 15 through the opening on the first fluid channel; or the fluid in the first fluid channel 15 is output to the outside through the opening thereof. Specifically, the side plate includes a body portion 49 and a cooling portion 51 located below the body portion 49. The body portion 49 is used to protect the cell unit 19 to reduce external impact and dust contamination on the cell unit 19. Further, the first fluid passage 15 is provided on the cooling portion 51.

In the present embodiment, a plurality of cell units 19 are provided between the two side plates. The plurality may be 2, 3, 4, 5, etc., and this application does not intend to be limited thereto. For example, as shown in fig. 1, the number of the cell units 19 is 12. The 12 cell units 19 are located between the first side plate 13 and the second side plate 14. Further, the cell unit 19 includes a casing 21 and an electric core body provided in the casing 21. The housing 21 is hollow as a whole. The hollow portion forms a cavity for receiving an electrical core. As shown in fig. 4, for example, the housing 21 includes a top wall 55, a housing body 57, and a bottom wall 59 arranged in this order from the top. The top wall 55, bottom wall 59 and housing body 57 define a cavity therebetween. Further, the electric core body can be a winding core of the power battery. Further, when the cell unit 19 is produced, the case body 57 and the bottom wall 59 are prewelded by high-temperature brazing, and the top wall 55 is welded after the core is inserted into the case. Further, a cooling flow passage 27 is provided on a bottom wall 59 of the housing 21. As shown in fig. 3 and 5, for example, the cooling flow channel 27 is provided at the bottom of the cell unit 19. Further, a first opening 22 and a second opening 25 are respectively provided on both ends of the cooling flow channel 27. I.e., the cooling flow channel 27 is open at both ends so as to penetrate the bottom wall 59 of the casing 21. For example, as shown in fig. 5, the first opening 22 and the second opening 25 are respectively located at the left end and the right end of the bottom wall 59 of the housing 21. The cooling channel 27 is used for cooling the electrical core. I.e. the cooling channels 27, for the passage of a cooling fluid, so that the cooling fluid can exchange heat with the electrical core. And then the electric core body is cooled.

Further, one of the first opening 22 and the second opening 25 of the adjacent cell units 19 communicates with the other when the cell units 19 are stacked, so that the cooling flow channels 27 in the plurality of cell units 19 communicate to form the second fluid channel 17. That is, when adjacent cell units 19 are stacked, the first opening 22 of one cell unit 19 can communicate with the second opening 25 of the adjacent cell unit 19. Or the second opening 25 of one cell unit 19 can communicate with the first opening 22 of an adjacent cell unit 19. Further, when a plurality of cell units 19 are stacked, the first opening 22 or the second opening 25 of each cell unit 19 can communicate with the second opening 25 or the first opening 22 of the adjacent cell unit 19, so that the cooling channels 27 in the plurality of cell units 19 are communicated and form one second fluid channel 17. For example, as shown, the cooling channels 27 in the 12 cell units 19 are connected to form a second fluid channel 17. Further, both ends of the second fluid passage 17 communicate with the two first fluid passages 15, respectively. For example, as shown in fig. 2, the left end in the second fluid passage 17 communicates with the first fluid passage 15 in the first side plate 13. The right end in the second fluid passage 17 communicates with the first fluid passage 15 in the second side plate 14. So that the external fluid can be introduced into the cooling flow passage 27 through the first fluid passage 15.

Further, the cell units 19 are stacked in the thickness direction of the electrical core. For example, as shown in fig. 1, 2, and 7, the thickness direction of the core body is substantially the left-right direction. The 12 cell units 19 are stacked substantially in the left-right direction. Further, the cooling flow channel 27 extends in the thickness direction of the electrical core. As shown in fig. 2, for example, the cooling flow path 27 extends substantially in the left-right direction. Further, the two side plates are oppositely arranged along the thickness direction of the electric core body. The two side plates are arranged opposite to each other substantially in the left-right direction.

In one embodiment, the bottom wall 59 of the housing 21 is provided with the first mating portion 31, the flow channel portion 33, and the first mating portion. Further, the first plugging portion 31, the flow channel portion 33, and the first fitting portion are arranged in this order along the stacking direction of the cell units 19. As shown in fig. 5, for example, the first mating member 31 is provided at the left end of the bottom wall 59 of the housing 21. The first fitting portion is provided at the right end of the bottom wall 59 of the housing 21. The flow channel part 33 is disposed at the right side of the first insertion part 31 and extends to the first mating part. Further, the cooling flow path 27 is provided on the flow path portion 33. Specifically, the cooling flow channel 27 extends in the stacking direction of the cell units 19 and penetrates the flow channel portion 33. As shown in fig. 5, for example, the cooling flow channel 27 extends substantially in the left-right direction and penetrates the flow channel portion 33. Further, the first inserting-connecting part 31 is inserted and matched with the first matching part, so that one of the first opening 22 and the second opening 25 of the adjacent cell unit 19 is butted with the other. By inserting the first insertion portion 31 into the first mating portion, the cooling channels 27 in the plurality of cell units 19 can be sequentially communicated; on the other hand, a plurality of cell units 19 can be connected. For example, as shown in fig. 6, 12 cell units 19 from left to right are in plug-in fit with the first fitting portion through the adjacent first plug-in portion 31, and then 12 cell units 19 are connected. Further, one of the first opening 22 and the second opening 25 of the adjacent cell unit 19 is in sealed communication with the other one when the first plugging portion 31 is in plugging fit with the first fitting portion. This prevents fluid from escaping between adjacent cooling channels 27 and damaging the core or causing safety hazards.

Further, the bottom wall 59 includes the bottom plate 35 and a boss provided at one end of the bottom plate 35. The protrusion protrudes from the bottom plate 35 toward the inside of the electrical core, and the protrusion forms the flow path portion 33. For example, as shown in fig. 5, the boss is located above the bottom plate 35. And the boss is provided on the right side of the bottom plate 35. The boss portion is provided with a cooling flow passage 27 penetrating therethrough substantially in the left-right direction.

Further, two opposite first insertion walls 37 are provided on the other end of the bottom plate 35. As shown in fig. 5, for example, two first insertion walls 37 are provided on the left end of the bottom plate 35 so as to be opposed to each other in the front-rear direction. The projection has a first stop surface 39 facing the first plug-in wall 37. For example, as shown in fig. 5, the first stop surface 39 faces to the left. Further, an upwardly open groove is formed between the two first socket walls 37, the first stop surface 39 and the bottom plate 35. The recess forms a first plug part 31.

Further, the projection includes an extension 41 extending from the bottom plate 35 in a direction away from the first socket 31. Specifically, the projection includes a projection body 53 facing the bottom plate 35 and an extension 41 extending from the projection body 53 in a direction away from the first mating member 31. For example, as shown in fig. 5, the extension 41 is located on the right side of the projection body 53.

Further, the first fitting portion is provided on the extension portion 41. Specifically, the first mating portion includes a second stop surface 43, a first mating surface 45, and a first abutment surface 47. The second stop surface 43 is located on a side of the extension 41 opposite the first stop surface 39. For example, as shown in fig. 5, the second stop surface 43 faces rightward. Further, there are two first mating surfaces 45. The two first mating surfaces 45 are oppositely disposed on the extension portion 41. As shown in fig. 5, for example, two first mating surfaces 45 are respectively located on the front side and the rear side of the extension portion 41. Further, the first abutting surface 47 is located on a side of the extending portion 41 away from the electrical core body. As shown in fig. 5, for example, the first abutment surface 47 is located at the bottom of the extension 41. Further, the second stop surface 43, the first mating surface 45 and the first abutment surface 47 are respectively used for abutting against the first stop surface 39, the first plug wall 37 and the bottom plate 35 of the adjacent cell unit 19. So that when the first mating part 31 is mated with the first mating part, the second stop surface 43 contacts the first stop surface 39, the first mating surface 45 contacts the first socket wall 37, and the first abutment surface 47 contacts the bottom plate 35. Specifically, when the modules are grouped, the cell units 19 are stacked one by one, and the cooling flow channel 27 is communicated and sealed through the first opening 22 and the second opening 25.

Further, the first fluid passage 15 is provided in the cooling portion 51 of the side plate. The cooling portion 51 of the side plate includes a plate body and a cooling protrusion provided on the plate body. The cooling protrusion protrudes from the plate body towards the body portion 49 and is provided with a first fluid channel 15.

Further, a second matching portion and a second inserting portion for connecting with two ends of the second fluid channel 17 are respectively disposed on the two side plates. Further, the second matching portion is disposed on the first side plate 13. The second mating portion is disposed on the second side plate 14. That is, the second fitting portion is used to connect with the left end of the bottom wall 59 of the casing 21 of the adjacent cell unit 19. The second plug portion is configured to be connected to a right end of the bottom wall 59 of the housing 21 of the adjacent cell unit 19. Therefore, after the battery cell units 19 are stacked, the two side plates are respectively provided with the second matching part and the second inserting part which are matched with the first inserting part 31 and the first matching part, so that the connection function is realized after the module is subjected to pressure welding.

Further, the second mating portion includes a third stop surface, a second mating surface, and a second abutment surface. The third stop surface is located on the side of the cooling projection facing the cell unit 19. The two second matching surfaces are oppositely arranged on the cooling bulge. This second abutment surface is located on the side of the cooling projection remote from the body portion 49. The third stop surface, the second mating surface and the second abutment surface are respectively configured to abut against the first stop surface 39, the first insertion wall 37 and the bottom plate 35 of the adjacent cell unit 19.

Furthermore, two opposite second insertion walls are arranged on the plate body; the cooling protrusion is provided with a fourth stop surface facing the second plug-in wall; grooves which are opened upwards are formed among the two second insertion walls, the fourth stop surfaces and the plate body; the groove forms a second mating part.

Further, the embodiment of the present application also provides a battery cell unit 19, which includes: a housing 21; on which a cooling flow channel 27 is provided; a first opening 22 and a second opening 25 are respectively arranged at two ends of the cooling flow channel 27; an electrical core; disposed within the housing 21; the cooling flow channel 27 is used for cooling the electric core.

It should be noted that, in the description of the present application, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is intended or should be construed to indicate or imply relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided would be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego the subject matter and should not be construed as an admission that the applicant does not consider such subject matter to be part of the disclosed subject matter.

Claims

1. A power battery module, its characterized in that, it includes:

the two side plates are oppositely arranged, and a first fluid channel which is opened outwards is arranged on each side plate; each of the side plates includes a body portion and a cooling portion located below the body portion, the first fluid passage being provided on the cooling portion;

the battery cell units are arranged between the two side plates; the battery cell unit comprises a shell and a battery core body arranged in the shell; a cooling flow channel is arranged on the bottom wall of the shell; a first opening and a second opening are respectively arranged at two ends of the cooling flow channel; the cooling flow channel is used for cooling the electric core body; one of the first opening and the second opening of the adjacent cell units is communicated with the other one when the cell units are stacked, so that the cooling flow channels in the plurality of cell units are communicated to form a second fluid channel; two ends of the second fluid channel are respectively communicated with the two first fluid channels;

the bottom wall of the shell is provided with a first inserting part, a flow channel part and a first matching part; the cooling flow channel is arranged on the flow channel part; the first inserting part is inserted and matched with the first matching part, so that one of the first opening and the second opening of the adjacent battery cell units is butted with the other opening;

the cooling flow channel extends along the stacking direction of the battery cell units and penetrates through the flow channel part;

the first inserting part, the flow channel part and the first matching part are sequentially arranged along the stacking direction of the battery cell units;

the bottom wall comprises a bottom plate and a convex part arranged at one end of the bottom plate; the bulge part protrudes from the bottom plate towards the interior of the electric core body, and the bulge part forms the flow channel part;

the other end of the bottom plate is also provided with two opposite first insertion walls; the boss has a first stop surface facing the first plug wall; an upward open groove is formed among the two first plug-in walls, the first stop surface and the bottom plate; the groove forms the first inserting part;

the protruding part comprises an extending part extending from the bottom plate to the direction far away from the first inserting part; the first matching part is arranged on the extension part.

2. The power battery module as claimed in claim 1, wherein the first mating portion comprises a second stop surface, a first mating surface and a first abutting surface; the second stop surface is positioned on one side of the extension part, which is opposite to the first stop surface; the two first matching surfaces are oppositely arranged on the extension part; the first abutting surface is positioned on one side, far away from the electric core, of the extension part; the second stop surface, the first mating surface and the first abutting surface are respectively used for abutting against the first stop surface, the first plug wall and the bottom plate of the adjacent battery cell unit.

3. The power battery module of claim 1, wherein the cell units are stacked in a thickness direction of the electrical core, and the cooling flow channel extends in the thickness direction of the electrical core; the two side plates are oppositely arranged along the thickness direction of the electric core body.