CN110224090A - Heat conduction type square battery pack - Google Patents

Abstract

The invention discloses a heat-conducting prismatic battery pack, comprising a casing and a prismatic battery pack, wherein the prismatic battery pack is formed of battery cells in series and parallel, the top end of the casing is provided with an accommodating space facing downward, and further comprises: : Positive fin structure, the positive fin structure is symmetrically and fixedly connected on the inner side walls of the two sides of the accommodation space, and the accommodation space is divided by the positive fin structure to form an installation area for installing battery cells; heat conduction plate , the heat-conducting plate includes an end heat-conducting plate, the end heat-conducting plate is located in the accommodating space and is arranged at the end of the square battery pack; the invention realizes that the temperature in the casing is uniform when the battery cell is working, and the battery cell is working at the same time. The battery cells placed in the adjacent installation area will not be squeezed due to expansion, thus ensuring safety.

Description

A thermally conductive prismatic battery pack

technical field

The invention relates to the technical field of start-up power system equipment, in particular to a heat-conducting prismatic battery pack.

Background technique

As a modern industrial product that promotes human civilization, automobiles not only bring unprecedented convenience to human production and life, but also bring scientific and technological progress in social industry. In the starting power system, which is the core component of the automobile, lead-acid batteries are still mostly used in the current models, which are not only large in size, heavy in weight, less in power storage, and fast attenuated, but also cause great pollution to the environment due to the application of lead. , With the advancement of lithium-ion battery technology, more and more companies are paying attention to and developing the starting power supply of lithium-ion batteries to replace traditional lead-acid batteries.

However, considering the structural characteristics of the lithium-ion battery itself and the complexity of the battery pack in series and parallel, especially in the case of an external electrical short circuit, it is easy to cause the thermal runaway of the battery, resulting in a fire and explosion of the battery and a safety accident. However, in the existing prismatic battery pack, due to the close contact between adjacent battery cells, when the adjacent battery cells are squeezed together, it is easy to cause electrical short circuit of the battery, resulting in fire and explosion, and there is a certain risk factor; When the battery cells work, heat is generated. Since there is no heat conduction device between adjacent battery cells, the temperature of the battery cells will be uneven in the case when they work, and there is a certain safety hazard.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a thermally conductive prismatic battery pack to solve the above-mentioned problems in the background art.

To achieve the above object, the present invention provides the following technical solutions:

A heat-conducting prismatic battery pack, comprising a casing and a prismatic battery pack, wherein the prismatic battery pack is formed by battery cells in series and parallel, the top of the casing is provided with an accommodating space facing downward, and further comprises:

A positive fin structure, the positive fin structure is symmetrically and fixedly connected to the inner side walls on both sides of the accommodating space, and the accommodating space is divided by the positive fin structure to form an installation area for installing battery cells;

The thermal conduction plate includes an end thermal conduction plate, the end thermal conduction plate is located in the accommodating space and is arranged at the end of the square battery pack; the adjacent battery cells are abutted with an intermediate thermal conduction plate.

As a further solution of the present invention: the materials of the end heat-conducting plate and the intermediate heat-conducting plate are both phase-change materials, because the intermediate heat-conducting plate is located between adjacent battery cells, and the end heat-conducting plate is located at the end of the square battery pack. The battery cell will generate heat when it is working. Since the materials of the end heat conduction plate and the middle heat conduction plate are phase change materials, the end heat conduction plate and the middle heat conduction plate will absorb the heat generated by the battery cell during operation, preventing the battery cell from working. The temperature inside the case is too high, and the material of the case is aluminum alloy. Since the end heat-conducting plate and the intermediate heat-conducting plate with high thermal conductivity are located on the inside of the case, the temperature between the battery cells is effectively ensured, and the inside of the case is not stable. There will be a large temperature difference.

As a further solution of the present invention: a limit piece is arranged between the end heat conducting plate and the square battery pack, the limit piece is vertically and fixedly connected at the bottom of the accommodating space, and the limit piece limits the amount of space the square battery pack is located in the housing. Location.

As a further solution of the present invention, side fin structures are symmetrically arranged in the accommodating space, the side fin structures are fixedly connected to the inner side walls at both ends of the accommodating space at equal distances, and the side fin structures increase the housing The strength and stiffness of the shell can prevent the shell from being damaged by external impact;

The end heat-conducting plate is located between the side fin structure and the limiting piece, and the end heat-conducting plate is provided with gaps for accommodating the side fin structure at equal distances. It is inserted in the middle of the side fin structure.

As a further solution of the present invention: the upper end of the casing is provided with an integrated cover plate, the integrated cover plate includes a cover plate main body, and the integrated cover plate is provided with a buckle structure, and the buckle structure includes a first clip A connecting groove and a second locking groove, the first locking groove and the second locking groove are equally spaced at the edge of the integrated cover plate, the first locking groove is snap-fitted with the positive fin structure, and the The second clamping groove is engaged with the side fin structure, and the first clamping groove facilitates the clamping with the positive fin structure, and the second clamping groove facilitates the clamping with the side fin structure.

As a further solution of the present invention, the cover plate main body is fixedly connected with high-voltage connecting pieces at equal distances, and the high-voltage connecting pieces are electrically connected to the battery cells.

As a further solution of the present invention: a rectangular hole for fixing the high-voltage connecting piece is opened on the cover plate body, so as to facilitate the fixed connection of the high-voltage connecting piece on the cover plate body;

The material of the high-voltage connecting piece is copper or aluminum.

As a further solution of the present invention, a limit rib is arranged between the adjacent high-voltage connecting pieces, the limit rib is fixedly connected to the side wall of the cover plate body close to the square battery pack, and the lower part of the limit rib is located at the opposite side. Between adjacent battery cells, it is convenient to place the cover plate body on the battery cells through the limiting ribs.

As a further solution of the present invention, an upper cover is sealingly connected to the top of the casing, and a sealed cavity is formed between the upper cover and the casing.

Compared with the prior art, the beneficial effects of the present invention are: the present invention provides an accommodating space on the top of the casing facing downward, so that the square battery pack can be placed in the casing from top to bottom; The structure forms an installation area, which is convenient for placing the battery cells in the casing; by disposing an inter-conducting plate between adjacent battery cells, the inter-conducting plate realizes the heat transfer of the battery cells in the casing during operation, and makes the temperature inside the casing. At the same time, since the end heat conduction plate and the intermediate heat conduction plate are both phase-change materials, when the battery cell expands, the end heat conduction plate and the intermediate heat conduction plate are squeezed, which will not affect the normal operation of the square battery, thus ensuring safety. The thermally conductive prismatic battery pack realizes the uniform temperature in the casing when the battery cells are working, and at the same time, the battery cells placed in the adjacent installation area will not be squeezed due to expansion when the battery cells are working, thus ensuring safety.

Description of drawings

Figure 1 is an exploded view of a thermally conductive prismatic battery pack;

FIG. 2 is a perspective view of a thermally conductive prismatic battery pack when the casing and the battery cells are connected;

3 is a schematic diagram of a thermally conductive plate in a thermally conductive prismatic battery pack;

4 is a schematic top view of an integrated cover plate in a thermally conductive prismatic battery pack;

FIG. 5 is a schematic bottom view of an integrated cover plate in a thermally conductive prismatic battery pack;

In the picture: 1 shell, 2 square battery pack, 3 battery cells, 4 accommodation space, 5 positive fin structure, 6 installation area, 7 upper cover, 8 heat conduction plate, 8-1 end heat conduction plate, 8-2 heat conduction plate, 8-3 clearance, 9 limit piece, 10 side fin structure, 11 integrated cover, 11-1 cover body, 11-2 high voltage connection piece, 11-3 snap structure, 11-4 first A snap slot, 11-5 second snap slot, 11-6 limit rib.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to FIGS. 1-5 , in an embodiment of the present invention, a thermally conductive prismatic battery pack includes a casing 1 and a prismatic battery pack 2 . The prismatic battery pack 2 is formed of battery cells 3 in series and parallel. There is an accommodating space 4 facing downwards, which also includes:

The positive fin structure 5, the positive fin structure 5 is symmetrically and fixedly connected to the inner side walls on both sides of the accommodating space 4, and the accommodating space 4 is divided by the positive fin structure 5 to form an installation area 6 for installing the battery cells 3;

The heat-conducting plate 8 includes an end heat-conducting plate 8-1, and the end heat-conducting plate 8-1 is located in the accommodating space 4 and is arranged at the end of the square battery pack 2; An indirect heat conduction plate 8-2 is connected.

The material of the end heat conduction plate 8-1 and the middle heat conduction plate 8-2 are both phase change materials, because the middle heat conduction plate 8-2 is located between the adjacent battery cells 3, and the end heat conduction plate 8-1 is located in the square battery pack 2 At the end of the battery cell 3, heat will be generated when the battery cell 3 works. Since the materials of the end heat conduction plate 8-1 and the middle heat conduction plate 8-2 are both phase-change materials, the end heat conduction plate 8-1 and the middle heat conduction plate 8- 2. It will absorb the heat generated by the battery cell when it is working to prevent the temperature inside the casing 1 from being too high when the battery cell 3 is working. The material of the casing 1 is aluminum alloy material. The heat-conducting plates 8 - 2 and 8 are located on the inner side of the casing 1 , which effectively ensures that the temperature between the battery cells 3 is uniform, and there is no large temperature difference in the casing 1 .

A limiting piece 9 is arranged between the end heat conducting plate 8-1 and the rectangular battery pack 2. The limiting piece 9 is vertically and fixedly connected to the bottom of the accommodating space 4. Location.

The side fin structures 10 are symmetrically arranged in the accommodating space 4 , and the side fin structures 10 are fixedly connected to the inner side walls of both ends of the accommodating space 4 at equal distances. The side fin structures 10 increase the strength and rigidity of the housing 1 , Prevent the shell from being damaged by external impact;

The end heat conduction plate 8-1 is located between the side fin structure 10 and the limiting piece 9, and the end heat conduction plate 8-1 is provided with gaps 8-3 for accommodating the side fin structure 10 at equal distances. Since the end heat conduction plate 8- The setting of the upper gap 8-3 is convenient for inserting the end heat conducting plate 8-1 in the middle of the side fin structure 10.

The upper end of the housing 1 is provided with an integrated cover plate 11, the integrated cover plate 11 includes a cover plate main body 11-1, and the integrated cover plate 11 is provided with a snap structure 11-3, and the snap structure 11-3 includes a first snap groove 11-4 and the second snap slot 11-5, the first snap slot 11-4 and the second snap slot 11-5 are equally spaced at the edge of the integrated cover 11, the first snap slot 11-4 and the The positive fin structure 5 is snap-fitted, and the second snap-fit slot 11-5 is snap-fitted with the side fin structure 10. The first snap-fit slot 11-4 facilitates snap-fit with the positive fin structure 5. The snap-fit grooves 11-5 are convenient for snap-fit with the side fin structure 10 .

A high-voltage connecting piece 11-2 is fixedly connected to the cover body 11-1 at an equal distance, and the high-voltage connecting piece 11-2 is electrically connected to the battery cell 3. As shown in FIG.

The cover plate main body 11-1 is provided with a rectangular hole for fixing the high-voltage connecting piece 11-2, so that the high-voltage connecting piece 11-2 can be fixedly connected to the cover plate main body 11-1;

The high-voltage connecting piece 11-2 is made of copper or aluminum.

A limiting rib 11-6 is arranged between the adjacent high-voltage connecting pieces 11-2, and the limiting rib 11-6 is fixedly connected to the side wall of the cover plate main body 11-1 close to the square battery pack 2. The limiting rib 11-6 is The lower part is located between adjacent battery cells 3 , and the cover plate body 11 - 1 is conveniently placed on the battery cells 3 through the limiting ribs 11 - 6 .

The top of the casing 1 is sealedly connected with an upper cover 7 , and a sealed cavity is formed between the upper cover 7 and the casing 1 .

When the present invention is in use, the staff places the battery cells 3 in the accommodating space 4 from top to bottom, and then puts the heat conduction plate 8-2 between the adjacent battery cells 3, and places the battery cells 3 in the square battery pack 2. The end of the battery is placed in the end thermal conduction plate 8-1. Since the intermediate thermal conduction plate 8-2 and the end thermal conduction plate 8-1 are both phase-change materials, when the battery cell 3 is working, the intermediate thermal conduction plate 8-2 and the end thermal conduction plate 8-1 are passed through. The heat-conducting plate 8-1 absorbs the heat generated by the battery cell 3 when it is working. Since the intermediate heat-conducting plate 8-2 is in contact with the battery cell 3, the end heat-conducting plate 8-1 and the intermediate heat-conducting plate 8-2 are both in contact with each other. Phase change material, the thermal expansion of the battery cells 3 during operation causes the deformation of the inter-conducting plate 8-2, thus preventing the phenomenon of mutual extrusion between the adjacent battery cells 3 due to expansion, the staff will install the integrated cover 11 on the The top end of the prismatic battery pack 2 is installed by sealingly connecting the upper cover 7 to the top end of the casing 1 .

Although this specification is described in terms of embodiments, not every embodiment only includes an independent technical solution. This description in the specification is only for the sake of clarity. Those skilled in the art should take the specification as a whole. The technical solutions can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Therefore, the above is only a preferred embodiment of the present application, and is not intended to limit the scope of implementation of the present application; that is, all equivalent transformations made according to the scope of the claims of the present application are the protection scope of the claims of the present application. .

Claims (10)

1. a kind of heat-conducting prismatic batteries, including shell (1) and prismatic batteries (2), the prismatic batteries (2) are by battery Monomer (3) forms in series and parallel, it is characterised in that: the top of the shell (1) offers accommodating space (4) downwards, further includes:

Positive fin structure (5), the positive fin structure (5) are symmetrically fixedly connected on the two sides inner sidewall of accommodating space (4), institute It states accommodating space (4) and divides the installation section (6) formed for installing battery cell (3) by positive fin structure (5)；

Heat-conducting plate (8), the heat-conducting plate (8) include end heat-conducting plate (8-1), and the end heat-conducting plate (8-1) is located at accommodating space (4) It is interior, and be arranged in the end of prismatic batteries (2)；Abutting between the adjacent battery cell (3) has a heat-conducting plate (8-2).

2. a kind of heat-conducting prismatic batteries according to claim 1, which is characterized in that the end heat-conducting plate (8-1) and Between the material of heat-conducting plate (8-2) be phase-change material.

3. a kind of heat-conducting prismatic batteries according to claim 1, which is characterized in that the end heat-conducting plate (8-1) and It is provided between prismatic batteries (2) limit film (9), the limit film (9) is fixedly connected on accommodating space (4) bottom vertically.

4. a kind of heat-conducting prismatic batteries according to claim 1, which is characterized in that right in the accommodating space (4) Title is provided with side fin structure (10), and the side fin structure (10) is equidistantly fixedly connected on the inside of the both ends of accommodating space (4) On wall；

The end heat-conducting plate (8-1) is located between side fin structure (10) and limit film (9), and the end heat-conducting plate (8-1) is first-class Away from the gap (8-3) being provided with for accommodating side fin structure (10).

5. a kind of heat-conducting prismatic batteries according to claim 4, which is characterized in that the upper end of the shell (1) is set It is equipped with integrated cover board (11), the integrated cover board (11) includes cover plate main body (11-1), is provided on the integrated cover board (11) Buckle structure (11-3), the buckle structure (11-3) includes the first clamping groove (11-4) and the second clamping groove (11-5), described First clamping groove (11-4) and the second clamping groove (11-5) are placed equidistant in integrated cover board (11) edge, first clamping Slot (11-4) and positive fin structure (5) are engaged by clamping, and second clamping groove (11-5) and side fin structure (10) are engaged by clamping.

6. a kind of heat-conducting prismatic batteries according to claim 5, which is characterized in that on the cover plate main body (11-1) It is equidistantly fixedly connected with high pressure connection sheet (11-2), the high pressure connection sheet (11-2) is electrically connected with battery cell (3).

7. a kind of heat-conducting prismatic batteries according to claim 6, which is characterized in that on the cover plate main body (11-1) Offer the rectangular opening for fixing high pressure connection sheet (11-2).

8. a kind of heat-conducting prismatic batteries according to claim 6, which is characterized in that the high pressure connection sheet (11-2) Material be copper sheet or aluminium flake.

9. a kind of heat-conducting prismatic batteries according to claim 6, which is characterized in that the adjacent high pressure connection sheet It is provided between (11-2) limit rib (11-6), the limit rib (11-6) is fixedly connected on cover plate main body (11-1) close to rectangular On the side wall of battery pack (2), the lower section of the limit rib (11-6) is located between adjacent cell monomer (3).

10. a kind of heat-conducting prismatic batteries according to claim 1, which is characterized in that the top of the shell (1) is close Envelope is connected with upper cover (7), forms seal cavity between the upper cover (7) and shell (1).