CN219329308U

CN219329308U - Battery pack

Info

Publication number: CN219329308U
Application number: CN202320918991.6U
Authority: CN
Inventors: 韩钰莹; 方勇; 吉影; 朱肃然; 陈国强
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-04-21
Filing date: 2023-04-21
Publication date: 2023-07-11
Anticipated expiration: 2033-04-21

Abstract

The application provides a battery pack comprising: battery pack and heat exchange plate. The battery pack comprises a plurality of single batteries which are arranged side by side. The heat exchange plate is arranged on one side of the battery pack and is used for exchanging heat with the battery pack. The heat exchange plate includes: a first plate and a second plate. The first board comprises a first surface and a second surface which are oppositely arranged, a first groove is formed in the first surface, a protrusion is formed on the second surface by the first groove, and the single battery is matched with the protrusion. The first groove and the second plate form a heat exchange flow passage. The battery pack provided by the application has the advantages that the surface area of the heat exchange plate is increased by the protrusions on the heat exchange plate, namely, the heat exchange area of the heat exchange plate is increased, so that the heat exchange plate can perform sufficient heat exchange rate with the single battery, the heat exchange efficiency of the single battery is improved, the influence of temperature on the service life of the battery pack is reduced, and the aging speed of the battery pack is reduced.

Description

Battery pack

Technical Field

The application relates to the technical field of single batteries, in particular to a battery pack.

Background

The battery pack can generate larger heat in the charge and discharge process, so that the service life of the battery is influenced due to the fact that high temperature is generated in the battery pack, and even a safety accident occurs due to thermal runaway.

In the prior art, a common battery pack radiates heat in a liquid cooling mode, the liquid cooling mode takes away heat by using a circulating liquid cooling agent, and the heat of the battery is exchanged to achieve the aim of radiating heat; the runner design of the heat exchange plate is different according to the size design mode of the battery, the runner form is a five-flower eight-door, the design is complex, the processing time is long, and the heat dissipation performance is poor.

Disclosure of Invention

The purpose of this application is to provide a simple structure, the battery package that the radiating effect is good.

To achieve the above object, the present application provides a battery pack comprising: the battery pack comprises a plurality of single batteries which are arranged side by side; the heat exchange plate is arranged on one side of the battery pack and extends along the side-by-side direction of the plurality of single batteries, and the heat exchange plate is used for exchanging heat with the battery pack; the heat exchange plate includes: the first plate comprises a first surface and a second surface which are oppositely arranged, a first groove is formed in the first surface, a protrusion is formed on the second surface by the first groove, and the single battery is matched with the protrusion; and the second plate is covered on the first plate, the second plate comprises a second groove and a third groove, the first groove and the second plate form a heat exchange flow channel, the second groove and the first plate enclose a liquid inlet flow channel, the third groove and the first plate enclose a liquid outlet flow channel, and the liquid inlet flow channel and the liquid outlet flow channel are communicated with the heat exchange flow channel.

Compared with the prior art, the technical scheme has the following advantages:

the bulges on the heat exchange plate increase the surface area of the heat exchange plate, namely the heat exchange area of the heat exchange plate, so that the heat exchange plate can perform full heat exchange with the single battery, the heat exchange efficiency of the single battery is improved, the influence of temperature on the service life of the battery pack is reduced, and the aging speed of the battery pack is reduced.

Drawings

The following drawings are only for purposes of illustration and explanation of the present application and are not intended to limit the scope of the present application. Wherein:

fig. 1 is a partial schematic structure of a first embodiment of a battery pack according to the present application;

FIG. 2 is an enlarged schematic view of the portion A in FIG. 1;

FIG. 3 is a schematic view of a first embodiment of a heat exchanger plate according to the present application;

FIG. 4 is a schematic view of a heat exchanger plate according to the present application from a second view angle;

fig. 5 is a schematic partial structure of a second embodiment of a battery pack according to the present application;

FIG. 6 is a schematic view of a heat exchanger plate according to a second embodiment of the present application from a first view angle;

FIG. 7 is a schematic view of a second embodiment of a heat exchanger plate according to the present application;

FIG. 8 is a schematic view of a third embodiment of a heat exchanger plate according to the present application from a first view angle;

FIG. 9 is a schematic view of a third embodiment of a heat exchanger plate according to the present application from a second view angle;

fig. 10 is a schematic view of a heat exchanger plate according to a fourth embodiment of the present utility model from a first view angle;

fig. 11 is a schematic view of a heat exchanger plate according to a fourth embodiment of the present utility model from a second view.

Reference numerals illustrate:

10. a battery pack; 11. a single battery; 111. a main body; 112. a flange edge;

20. a heat exchange plate; 21. a first plate; 22. a second plate; 23. a first groove; 24. a second groove; 25. a third groove; 26. an outlet; 27. a fourth groove; 28. a mating groove; 29. an inlet;

30. a heat exchange plate;

41. a heat exchange flow passage; 42. a liquid inlet flow channel; 43. a liquid outlet channel; 44. a liquid inlet; 45. and a liquid outlet.

Detailed Description

The present application is further described in detail below by way of the accompanying drawings and examples. The features and advantages of the present application will become more apparent from the description.

The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not collide with each other. The following discussion provides various embodiments of the present application. Although each embodiment represents a single combination of applications, different embodiments of the application may be substituted or combined, and therefore the application is also considered to include all possible combinations of the same and/or different embodiments described. Thus, if one embodiment comprises A, B, C and another embodiment comprises a combination of B and D, then the present application should also be considered to include embodiments comprising one or more of all other possible combinations comprising A, B, C, D, although such an embodiment may not be explicitly recited in the following. In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not collide with each other.

As shown in fig. 1 to 11, the present application provides a battery pack including: the battery pack 10 and the heat exchange plate 20.

The battery pack 10 includes a plurality of unit cells 11 arranged side by side.

The heat exchange plate 20 is disposed at one side of the battery pack 10 and extends in the side-by-side direction L of the plurality of unit cells 11, and the heat exchange plate 20 is used for exchanging heat with the battery pack 10.

As shown in fig. 1 to 4, the heat exchange plate 20 includes: a first plate 21 and a second plate 22.

The first plate 21 includes a first surface and a second surface that are disposed opposite to each other, a first groove 23 is disposed on the first surface, and the first groove 23 forms a protrusion on the second surface, and the unit cell 11 is adapted to the protrusion.

The second plate 22 is covered on the first plate 21, the second plate 22 comprises a second groove 24 and a third groove 25, the first groove 23 and the second plate 22 form a heat exchange flow channel 41, the second groove 24 and the first plate 21 enclose a liquid inlet flow channel 42, the third groove 25 and the first plate 21 enclose a liquid outlet flow channel 43, and the liquid inlet flow channel 42 and the liquid outlet flow channel 43 are communicated with the heat exchange flow channel 41.

The battery pack provided by the application has the advantages that the surface area of the heat exchange plate is increased by the protrusions on the heat exchange plate, namely, the heat exchange area of the heat exchange plate is increased, so that the heat exchange plate can perform sufficient heat exchange rate with the single battery, the heat exchange efficiency of the single battery is improved, the influence of temperature on the service life of the battery pack is reduced, and the aging speed of the battery pack is reduced.

As shown in fig. 2 and 5, in one embodiment of the present application, a fitting groove 28 is provided between adjacent protrusions, and at least a portion of the unit cell 11 is inserted into the fitting groove 28.

The side of the single battery 11 is inserted into the matching groove 28, so that the contact area between the single battery 11 and the heat exchange plate 20 is increased, the heat exchange plate 20 can absorb more heat generated by the single battery 11, the heat exchange efficiency of the battery pack 10 is improved, and the influence of temperature on the service life of the battery pack 10 is further reduced, so that the aging speed of the battery pack 10 is reduced.

In a specific embodiment of the present application, the battery pack includes a top wall and a bottom wall that are disposed opposite to each other, and a side wall that is disposed between the top wall and the bottom wall, the side wall includes two opposite first sides, two opposite second sides, one second side is connected to the two first sides, respectively, and an area of the first sides is larger than an area of the second sides, so that the unit battery is in a sheet shape, and the first sides and the second sides of the two adjacent unit batteries are disposed opposite to each other.

As shown in fig. 2 and 5, the battery pack further includes a plurality of heat exchange plates 30, where the heat exchange plates 30 are located between two adjacent unit batteries 11, so that the heat exchange plates 30 cool the first side surfaces of the adjacent unit batteries 11, i.e. the heat exchange plates 30 cool the "large" surfaces of the unit batteries 11. And the heat exchange plate 20 can cool the side of the unit cell 11, i.e. the heat exchange plate 20 can cool the second side. The heat exchange plate 30 and the heat exchange plate 20 simultaneously cool a plurality of surfaces of the single battery 11, thereby improving the heat exchange efficiency of the battery pack 10, and further reducing the influence of temperature on the service life of the battery pack 10, so as to reduce the aging speed of the battery pack 10.

As shown in fig. 5, in one embodiment of the present application, the battery includes a main body 111 and a flange 112 disposed at an edge of the main body 111, a step surface is formed at a connection portion between the flange 112 and the main body 111, an outer surface of a protrusion and a groove wall of a mating groove 28 disposed adjacent to the protrusion form a mating surface, and the mating surface abuts against the step surface.

The structure enables the side surface of the single battery 11 to be more attached to the surface of the heat exchange plate 20, so that the heat exchange plate 20 can absorb more heat generated by the single battery 11, the heat exchange efficiency of the battery pack 10 is improved, the influence of temperature on the service life of the battery pack 10 is further reduced, and the aging speed of the battery pack 10 is reduced.

As shown in fig. 6 and 7, in one embodiment of the present application,

the liquid inlet flow channel 42 is provided with a plurality of outlets 26, the heat exchange plate 20 is provided with a plurality of heat exchange flow channels 41, the heat exchange flow channels 41 are bent flow channels, one end of at least one heat exchange flow channel 41 is respectively communicated with one outlet 26, and the other ends of the plurality of heat exchange flow channels 41 are respectively communicated with the liquid outlet flow channel 43.

The above structure enables the plurality of heat exchange flow channels 41 to be arranged in parallel, so that the temperature of the heat exchange liquid flowing into different heat exchange flow channels 41 from the first total flow channel is consistent, even if the heat exchange effect of each heat exchange flow channel 41 on the single battery 11 is the same, the heat exchange effect of the heat exchange plate 20 on each single battery 11 is consistent, the heat exchange efficiency of the battery pack 10 is improved, the influence of the temperature on the service life of the battery pack 10 is further reduced, and the aging speed of the battery pack 10 is reduced.

As shown in fig. 8 and 9, in one embodiment of the present application, a portion of the first plate 21 corresponding to the arrangement position of the second groove 24 is a flat plate. I.e. the surface of the part is a plane, which means that the line connecting any two points on the plane falls entirely on the plane.

The portion of the first plate 21 corresponding to the position where the third groove 25 is provided is a flat plate. I.e. the surface of the part is a plane, which means that the line connecting any two points on the plane falls entirely on the plane.

An accommodating space is formed between the flat plate structure on the heat exchange plate 20 and the case of the battery pack, and some components in the battery pack may be disposed in the accommodating space, thereby improving space utilization.

As shown in fig. 8 and 9, in a specific embodiment of the present application, a plurality of heat exchange channels 41 form a heat exchange group, and the heat exchange group includes a liquid inlet 44 and a liquid outlet 45, where the liquid inlet 44 is communicated with an outlet of the liquid inlet channel 42, and the liquid outlet 45 is communicated with the liquid outlet channel 43.

In the same heat exchange group, the flow direction of the liquid flowing into the heat exchange flow channels 41 from the liquid inlet 44 is the inflow direction, the flow direction of the liquid flowing into the liquid outlet 45 from the heat exchange flow channels 41 is the outflow direction, and the inflow direction and/or the outflow direction of at least two heat exchange flow channels 41 are different.

Further, the inflow direction and/or the outflow direction of at least two heat exchange flow channels 41 are opposite.

The flow channel is reasonable in layout, and the heat exchange group is covered on the heat exchange plate to cover the largest area, so that the heat exchange plate can perform full heat exchange rate with the single battery, the heat exchange efficiency of the single battery is improved, the influence of temperature on the service life of the battery is reduced, and the aging speed of the battery is reduced.

As shown in fig. 8 and 9, in one embodiment of the present application, in the heat exchange group, several heat exchange flow channels 41 are symmetrically disposed at both sides of the liquid inlet 44 and/or the liquid outlet 45.

The above structure further enables the temperature of the heat exchange liquid flowing into different heat exchange flow channels 41 from the first total flow channel to be consistent, even if the heat exchange effect of each heat exchange flow channel 41 to the single battery 11 is the same, thereby further ensuring that the heat exchange effect of the heat exchange plate 20 to each single battery 11 is consistent, further improving the heat exchange efficiency of the battery pack 10, further reducing the influence of the temperature on the service life of the battery pack 10, and further reducing the aging speed of the battery pack 10.

As shown in fig. 8 and 9, in one embodiment of the present application, the second plate 22 is provided with the fourth groove 27, the fourth groove 27 is disposed at a position opposite to that of the first groove 23, and the first groove 23 and the fourth groove 27 constitute the heat exchange flow passage 41. In a specific embodiment of the present application, the fourth groove 27 is a bent groove, the first plate 21 is provided with a plurality of first grooves 23, the plurality of first grooves 23 are disposed in parallel along the length direction of the first grooves 23, and one fourth groove 27 and a plurality of first grooves 23 in the plurality of first grooves 23 form the heat exchange flow channel 41.

The structure increases the flow area of the heat exchange flow channel 41, thereby reducing the flow resistance of the heat exchange liquid, reducing the flow velocity of the heat exchange liquid in the heat exchange flow channel 41, and fully exchanging heat between the heat exchange liquid and the single batteries 11, so that the heat exchange plate 20 can absorb more heat generated by the single batteries 11, improving the heat exchange efficiency of the battery pack 10, reducing the influence of temperature on the service life of the battery pack 10, and reducing the aging speed of the battery pack 10.

As shown in fig. 8 and 9, in one embodiment of the present application, the number of heat exchange flow passages 41 is three.

The heat exchange plate 20 is provided with three heat exchange flow passages 41 which are connected in parallel, so that the manufacturing process difficulty of the heat exchange plate 20 is low under the condition of meeting the use requirement, the production efficiency of a product is improved, and the production and manufacturing cost of the product is reduced; in addition, the situation that the flow passage is blocked and the circulation of the heat exchange liquid is influenced due to excessive heat exchange flow passages 41 arranged in parallel is avoided, so that the use reliability of the heat exchange plate 20 is improved.

As shown in fig. 10 and 11, in one embodiment of the present application, a plurality of heat exchange channels 41 are disposed on the heat exchange plate 20, and along the length direction of the heat exchange channels 41, the plurality of heat exchange channels 41 are disposed in parallel, and the liquid inlet channel 42 and the liquid outlet channel 43 are respectively communicated with two ends of each heat exchange channel 41.

The structure enables the plurality of heat exchange flow channels 41 to be arranged in parallel, so that the temperature of heat exchange liquid flowing into different heat exchange flow channels 41 from the liquid inlet flow channel 42 is consistent, even if the heat exchange effect of each heat exchange flow channel 41 on the single battery 11 is the same, the heat exchange effect of the heat exchange plate 20 on the plurality of single batteries 11 is consistent, the heat exchange efficiency of the battery pack 10 is improved, the influence of the temperature on the service life of the battery pack 10 is further reduced, and the aging speed of the battery pack 10 is reduced.

As shown in fig. 8, in one embodiment of the present application, among the outlets 26 of the plurality of liquid inlet channels, the flow area of the outlet 26 of the liquid inlet channel 42 disposed adjacent to the inlet 29 of the liquid inlet channel 42 is S1, and the flow area of the outlet 26 of the liquid inlet channel 42 disposed away from the inlet 29 of the liquid inlet channel 42 is S2, S1 < S2.

The farther the outlet 26 of the liquid inlet channel 42 is from the inlet 29 of the liquid inlet channel 42, the larger the flow resistance of the heat exchange liquid is, and the smaller the flow rate of the heat exchange liquid entering the heat exchange channel 41 is, therefore, the flow rate of the heat exchange liquid entering each heat exchange channel 41 is basically the same by adopting the arrangement mode of the overflow area of the outlet 26 of the liquid inlet channel 42, so that the heat exchange effect of each heat exchange channel 41 on the single battery 11 is the same, the heat exchange effect of the heat exchange plate 20 on the plurality of single batteries 11 is consistent, the heat exchange efficiency of the battery pack 10 is improved, and the influence of the temperature on the service life of the battery pack 10 is further reduced, so that the aging speed of the battery pack 10 is reduced.

In one embodiment of the present application, the unit cells are connected with the heat exchange plate through a heat conductive adhesive.

The heat-conducting glue is favorable for heat transfer, so that the single battery is connected with the heat exchange plate through the heat-conducting glue, and heat exchange between the single battery and the heat exchange plate is facilitated, so that the heat exchange efficiency of the battery pack is improved, the influence of temperature on the service life of the battery pack is reduced, and the aging speed of the battery pack is reduced.

As shown in fig. 2 and 5, in one embodiment of the present application, the unit cell 11 is clearance-fitted with the fitting groove 28.

In the working process of the single battery 11, the single battery 11 can expand, and the structure provides an expansion space for the single battery 11, so that the situation that the single battery 11 is extruded and cracked by the side wall of the matching groove 28 after expanding is avoided, and the use safety of the single battery 11 is ensured.

In a specific embodiment of the present application, a buffer structure is disposed between the unit cell and the mating groove, and the buffer structure may be a thermal pad, a thermal gel, a buffer pad, or the like. The buffer structure can absorb extrusion force generated by expansion of the single battery and mounting tolerance of the single battery during mounting.

In the description of the present application, it should be noted that the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it should be noted that the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, unless explicitly stated or limited otherwise. The term "plurality" means two or more, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

The present application has been described in connection with the preferred embodiments, but these embodiments are merely exemplary and serve only as illustrations. On the basis of this, many alternatives and improvements can be made to the present application, which fall within the scope of protection of the present application.

Claims

1. A battery pack, the battery pack comprising:

the battery pack comprises a plurality of single batteries which are arranged side by side; and

the heat exchange plate is arranged on one side of the battery pack and extends along the side-by-side direction of the plurality of single batteries, and the heat exchange plate is used for exchanging heat with the battery pack;

the heat exchange plate includes: the first plate comprises a first surface and a second surface which are oppositely arranged, a first groove is formed in the first surface, a protrusion is formed on the second surface by the first groove, and the single battery is matched with the protrusion; and

the second plate, the second plate lid is established on the first plate, the second plate includes second recess and third recess, first recess with the second plate constitutes the heat transfer runner, the second recess with first plate encloses into the feed liquor runner, the third recess with first plate encloses into the play liquid runner, the feed liquor runner with go out the liquid runner all with the heat transfer runner intercommunication.

2. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,

and a matching groove is arranged between the adjacent protrusions, and at least part of the single battery is inserted into the matching groove.

3. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,

the part of the first plate corresponding to the setting position of the second groove is a flat plate;

the portion of the first plate corresponding to the position of the third groove is a flat plate.

4. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,

the liquid inlet flow channel is provided with a plurality of outlets, the heat exchange plate is provided with a plurality of heat exchange flow channels, the heat exchange flow channels are bent flow channels, one end of at least one heat exchange flow channel is respectively communicated with one outlet of the liquid inlet flow channel, and the other ends of a plurality of heat exchange flow channels are respectively communicated with the liquid outlet flow channel.

5. The battery pack of claim 4, wherein the battery pack comprises a plurality of battery cells,

the heat exchange flow channels form a heat exchange group, the heat exchange group comprises a liquid inlet and a liquid outlet, the liquid inlet is communicated with the outlet of the liquid inlet flow channel, and the liquid outlet is communicated with the liquid outlet flow channel;

in the same heat exchange group, the flow direction of liquid flowing into the heat exchange flow channels from the liquid inlet is an inflow direction, the flow direction of liquid flowing into the liquid outlet from the heat exchange flow channels is an outflow direction, and the inflow direction and/or the outflow direction of at least two heat exchange flow channels are different.

6. The battery pack of claim 5, wherein the battery pack comprises a plurality of battery cells,

in the heat exchange group, a plurality of heat exchange flow channels are symmetrically arranged on two sides of the liquid inlet and/or the liquid outlet.

7. The battery pack of claim 4, wherein the battery pack comprises a plurality of battery cells,

the second plate is provided with a fourth groove, the arrangement position of the fourth groove is opposite to that of the first groove, and the first groove and the fourth groove form the heat exchange flow channel.

8. The battery pack of claim 7, wherein the battery pack comprises a plurality of battery cells,

the fourth groove is a bent groove, a plurality of first grooves are formed in the first plate, the first grooves are arranged in parallel along the width direction of the first grooves, and one fourth groove and a plurality of first grooves in the first grooves form the heat exchange flow channel.

9. The battery pack according to any one of claim 4 to 8, wherein,

and among the outlets of the liquid inlet channels, the overflow area of the outlet of the liquid inlet channel, which is adjacent to the inlet of the liquid inlet channel, is S1, and the overflow area of the outlet of the liquid inlet channel, which is far away from the inlet of the liquid inlet channel, is S2, wherein S1 is less than S2.

10. The battery pack of claim 2, wherein the battery pack comprises a plurality of battery cells,

the single battery is in clearance fit with the fit groove.