Cold plate assembly and battery pack with same

Abstract

The utility model discloses a cold plate assembly and a battery pack with the cold plate assembly, the cold plate assembly comprises a cold plate, a plurality of cooling flow channels are defined in the cold plate; the busbar is arranged on one side, in the thickness direction, of the cold plate, and the busbar is fixedly connected with the cold plate. According to the cold plate assembly, the busbar is integrated on the cold plate, on one hand, the cooling speed of the busbar can be increased in the working process of the battery pack, so that the reliability and the safety of the battery pack in the working process are improved, and on the other hand, the operation steps in the assembling process can be reduced, so that the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cold plate assembly and a battery pack having the same. Background Art

[0002] When the battery pack is in operation, current passing through the bus generates heat on the bus, causing the bus temperature to rise. In related technologies, when the battery pack is working, the cooling speed of the bus is slow, affecting the reliability and safety of the battery pack. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a cold plate assembly, which can improve the reliability and safety of the battery pack during operation.

[0004] The utility model also provides a battery pack having the cold plate assembly.

[0005] According to the first aspect of the utility model, the cold plate assembly comprises: a cold plate, in which a cooling channel is defined; a bus bar, which is arranged on one side of the cold plate in the thickness direction and is fixedly connected to the cold plate.

[0006] According to the cold plate assembly of the first aspect of the utility model, by integrating the bus bar into the cold plate, on the one hand, the cooling speed of the bus bar can be increased during the operation of the battery pack, thereby improving the reliability and safety of the battery pack during operation; on the other hand, the operating steps in the assembly process can be reduced, thereby improving production efficiency.

[0007] According to some embodiments of the present invention, a mounting groove is formed on one side surface of the cold plate in the thickness direction, and the busbar is arranged in the mounting groove.

[0008] According to some embodiments of the present invention, the cold plate is an injection molded part, and the busbar is embedded in the cold plate.

[0009] According to some embodiments of the utility model, the cold plate assembly also includes: a signal acquisition unit, which is used to collect temperature and current data on the bus, the signal acquisition unit and the bus are located on the same side of the cold plate, the signal acquisition unit includes a flexible circuit board and a signal acquisition part, the flexible circuit board is fixed on the cold plate, and the signal acquisition part is connected to the bus.

[0010] According to some embodiments of the present invention, the signal acquisition unit is opposite to the cooling channel.

[0011] According to some embodiments of the utility model, there are multiple cooling channels, the cooling channels extend along the length direction of the cold plate, and the multiple cooling channels are arranged at intervals in the width direction of the cold plate; the cold plate assembly also includes: a first collecting pipe and a second collecting pipe, the first collecting pipe and the second collecting pipe extend along the width direction of the cold plate and are respectively connected to the two ends of the length direction of the cold plate, the first collecting pipe cooperates with the cold plate to define a first channel connected to the multiple cooling channels, and the second collecting pipe and the cold plate define a second channel connected to the multiple cooling channels.

[0012] The battery pack according to the second aspect of the present invention comprises: a battery cell, wherein the battery cell is provided with a pole; the cold plate assembly according to the first aspect of the present invention, wherein the cold plate assembly cover is provided on a side of the battery cell provided with the pole, and the bus is connected to the pole.

[0013] According to the battery pack of the second aspect of the utility model, by providing the cold plate assembly according to the first aspect of the utility model, the reliability and safety of the battery pack during operation can be improved.

[0014] According to some embodiments of the present invention, an operation hole penetrating the cold plate along a thickness direction is formed on the cold plate, the operation hole is opposite to the bus bar, and the bus bar is welded to the pole.

[0015] According to some embodiments of the present invention, the battery pack further comprises: a heat-conducting material piece, wherein the heat-conducting material piece is filled in the operating hole.

[0016] According to some embodiments of the present invention, an explosion-proof valve is provided on a side of the battery cell facing the cold plate, and the explosion-proof valve is opposite to the cooling flow channel.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a battery pack according to an embodiment of the utility model;

[0019] Figure 2 yes Figure 1 An enlarged view of A shown in FIG.

[0020] Figure 3 yes Figure 1 The schematic diagram of the battery pack shown in FIG. 1 does not include the first current collector and the second current collector;

[0021] Figure 4 yes Figure 3An enlarged view of point B shown in FIG.

[0022] Figure 5 yes Figure 1 A schematic diagram of a cold plate assembly shown in ;

[0023] Figure 6 yes Figure 5 Schematic diagram of the cold plate, the first header and the second header shown in ;

[0024] Figure 7 yes Figure 6 Schematic diagram of the cold plate shown in;

[0025] Figure 8 yes Figure 7 The cross-sectional view along the CC direction is shown in FIG.

[0026] Reference numerals:

[0027] 1000, battery pack;

[0028] 100. Cold plate assembly;

[0029] 10. cold plate; 11. cooling channel; 12. first header; 121. first interface; 13. second header; 131. second interface; 14. operation hole; 15. mounting groove;

[0030] 20. Bus;

[0031] 30. Signal acquisition unit; 31. Flexible circuit board; 32. Signal acquisition unit;

[0032] 200, battery cell; 210, pole; 220, explosion-proof valve;

[0033] 300. Cabinet. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0035] Reference below Figure 1-Figure 8 A cold plate assembly 100 according to an embodiment of a first aspect of the present invention is described.

[0036] like Figure 2 , Figure 4 , Figure 5 , Figure 7 and Figure 8As shown, the cold plate assembly 100 according to the first embodiment of the utility model includes: a cold plate 10 and a bus bar 20 .

[0037] Specifically, a cooling channel 11 is defined in the cold plate 10 , and the bus bar 20 is disposed on one side of the cold plate 10 in the thickness direction, and the bus bar 20 is fixedly connected to the cold plate 10 .

[0038] The cooling channel 11 provides a flow channel for the cooling medium. The cooling medium can take away the heat on the cold plate 10 when flowing in the cooling channel 11, so that the cold plate 10 can achieve the cooling function. The busbar 20 is connected to the pole 210 of the battery cell 200, so that the current on multiple battery cells 200 can be collected.

[0039] It is understandable that, during the operation of the battery pack 1000, the current passing through the busbar 20 will generate heat on the busbar 20, causing the temperature of the busbar 20 to rise. In this embodiment, by setting the busbar 20 on the cold plate 10, the heat on the busbar 20 can be directly transferred to the cold plate 10, thereby improving the cooling effect of the busbar 20.

[0040] During the assembly process, the busbar 20 can be assembled onto the battery pack 1000 together with the cold plate 10 , thereby reducing the number of operation steps in the assembly process and improving production efficiency.

[0041] According to the cold plate assembly 100 of the first embodiment of the utility model, by integrating the bus 20 into the cold plate 10, on the one hand, the cooling speed of the bus 20 can be increased during the operation of the battery pack 1000, thereby improving the reliability and safety of the battery pack 1000 during operation; on the other hand, the operating steps in the assembly process can be reduced, thereby improving production efficiency.

[0042] In some embodiments of the present invention, Figure 6 As shown, a mounting groove 15 is formed on one side surface of the cold plate 10 in the thickness direction, and the busbar 20 is arranged in the mounting groove 15. In this way, the contact area between the busbar 20 and the cold plate 10 can be increased, thereby further improving the cooling rate of the busbar 20 by the cold plate 10, and further improving the reliability and safety of the battery pack 1000 during operation.

[0043] In some embodiments of the present invention, the cold plate 10 is an injection molded part, and the busbar 20 is embedded in the cold plate 10. That is, the busbar 20 is connected to one side of the cold plate 10 in the thickness direction through the insert injection molding process. The injection molding process has high production efficiency and good product consistency. By setting the cold plate 10 as an injection molded part, the production efficiency can be improved, and the yield rate of the cold plate assembly 100 can be improved.

[0044] During the production of the cold plate 10, the bus 20 is placed on the molding surface of one side surface of the injection mold in the thickness direction of the cold plate 10. In this way, after the cold plate 10 is cooled and formed, the cooled injection molding material abuts against the bus 20 around the bus 20, so that the bus 20 is embedded in the cold plate 10. At the same time, the side surface of the bus 20 away from the cold plate 10 is not wrapped with the injection molding material and can be normally connected to the pole 210, and the bus 20 will form a mounting groove 15 on the cold plate 10, thereby improving production efficiency and improving the reliability of the connection between the bus 20 and the cold plate 10.

[0045] In some embodiments of the present invention, the cold plate 10 is made of nylon material. Nylon material can be produced by injection molding, thereby meeting the production requirements of the cold plate assembly 100, and nylon material has good insulation performance and high strength, which can meet the use requirements of the battery pack 1000.

[0046] In some embodiments of the present invention, Figure 5 As shown, the cold plate assembly 100 also includes: a signal acquisition unit 30, the signal acquisition unit 30 is used to collect temperature and current data on the bus 20, the signal acquisition unit 30 and the bus 20 are located on the same side of the cold plate 10, the signal acquisition unit 30 includes a flexible circuit board 31 and a signal acquisition part 32, the flexible circuit board 31 is fixed on the cold plate 10, and the signal acquisition part 32 is connected to the bus 20.

[0047] In this way, the signal acquisition unit 30 can also be integrated into the cold plate 10. During operation, the cooling speed of the signal acquisition unit 30 can be increased, thereby further improving the reliability and safety of the battery pack 1000. In addition, during the production process, the operating steps can be further reduced, thereby further improving production efficiency.

[0048] In some embodiments of the present invention, the signal acquisition unit 32 is welded to the bus 20. On the one hand, the welding connection has high reliability and convenient operation, which can improve the reliability of the connection between the signal acquisition unit 32 and the bus 20 and improve production efficiency. On the other hand, the welding connection can realize the electrical connection between the signal acquisition unit 32 and the bus 20, so that the signal acquisition unit 30 can work normally.

[0049] In some embodiments of the present invention, the signal acquisition unit 30 is opposite to the cooling channel 11 , thereby improving the cooling efficiency of the signal acquisition unit 30 and thus improving the reliability of the signal acquisition unit 30 during operation.

[0050] In some embodiments of the present invention, Figure 7 and Figure 8As shown, there are multiple cooling channels 11, for example, there may be two, three or four cooling channels 11, the cooling channels 11 extend along the length direction of the cold plate 10, and the multiple cooling channels 11 are arranged at intervals in the width direction of the cold plate 10. In this way, the cooling medium can be distributed more evenly in the cold plate 10, thereby improving the effect of the cold plate 10.

[0051] like Figure 5 and Figure 6 As shown, the cold plate assembly 100 also includes: a first header 12 and a second header 13, the first header 12 and the second header 13 extend along the width direction of the cold plate 10 and are respectively connected to the two ends of the cold plate 10 in the length direction, the first header 12 cooperates with the cold plate 10 to define a first flow channel connected to the multiple cooling channels 11, and the second header 13 and the cold plate 10 define a second flow channel connected to the multiple cooling channels 11.

[0052] During the operation of the battery pack 1000, the cooling medium flows from the first flow channel into the cooling flow channel 11, and then flows out of the cold plate 10 from the second flow channel through the cooling flow channel 11, thereby realizing the circulation of the cooling medium in the cold plate 10, thereby realizing the cooling function of the cold plate 10. Preferably, the first header 12 and the second header 13 are welded to the cold plate 10, so that the sealed connection between the first header 12 and the second header 13 and the cold plate 10 can be ensured, and the connection strength between the first header 12 and the second header 13 and the cold plate 10 is relatively high, which can further improve the reliability of the battery pack 1000 during operation.

[0053] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, the first header 12 is provided with a first interface 121 , and the second header 13 is provided with a second interface 131 , thereby facilitating the cold plate 10 to be connected to the pipeline of the cooling system.

[0054] Reference below Figure 1-Figure 8 A battery pack according to an embodiment of the second aspect of the utility model is described.

[0055] According to the battery pack 1000 of the second embodiment of the utility model, Figure 1-Figure 4 As shown, it includes: a battery cell 200 and the cold plate assembly 100 according to the embodiment of the first aspect of the utility model.

[0056] Specifically, the battery cell 200 is provided with a pole 210 , the cold plate assembly 100 is covered on one side of the battery cell 200 where the pole 210 is provided, and the busbar 20 is connected to the pole 210 .

[0057] According to the battery pack 1000 of the second embodiment of the utility model, by providing the cold plate assembly 100 according to the first embodiment of the utility model, the reliability and safety of the battery pack 1000 during operation can be improved.

[0058] In some embodiments of the present invention, Figure 3 , Figure 4 and Figure 6 As shown, an operation hole 14 is formed on the cold plate 10 and passes through the cold plate 10 in the thickness direction. The operation hole 14 is opposite to the bus bar 20, and the bus bar 20 is welded to the pole 210. By providing the operation hole 14, an operation space can be provided when welding the bus bar 20 and the pole 210. By welding the bus bar 20 and the pole 210, the production efficiency can be improved, and the reliability of the connection between the bus bar 20 and the pole 210 can be improved. In addition, the welding connection can realize the electrical connection between the bus bar 20 and the pole 210, so that the battery pack 1000 can work normally. Preferably, the bus bar 20 and the pole 210 are connected by laser welding.

[0059] In some embodiments of the present invention, the battery pack 1000 further includes a heat-conducting material piece, which is filled in the operation hole 14. During the production process, after the busbar 20 and the pole 210 are welded through the operation hole 14, the heat-conducting material piece is filled in the operation hole 14. In this way, the heat exchange area between the busbar 20 and the cold plate 10 can be increased, and the heat exchange rate between the busbar 20 and the cold plate 10 can be increased, thereby further improving the cooling speed of the busbar 20. Preferably, the heat-conducting material piece can be a heat-conducting silica gel.

[0060] In some embodiments of the present invention, Figure 4 As shown, an explosion-proof valve 220 is provided on the side of the battery cell 200 facing the cold plate 10, and the explosion-proof valve 220 is opposite to the cooling channel 11. When thermal runaway occurs in the battery cell 200, the explosion-proof valve 220 will be in an open state, and high-temperature and high-pressure substances will be sprayed out from the explosion-proof valve 220. After the high-temperature and high-pressure substances burn through the cold plate 10 opposite to the explosion-proof valve 220, the cooling medium in the cooling channel 11 can be sprayed toward the explosion-proof valve 220, thereby cooling the high-temperature and high-pressure substances, reducing the probability of thermal runaway spreading, and further improving the safety of the battery pack 1000.

[0061] In some embodiments of the present invention, Figure 1 and Figure 3 As shown, the battery pack 1000 further includes: a box body 300 having an open opening, the battery cell 200 is disposed in the box body 300, and the cold plate assembly 100 is covered on the open opening of the box body 300, thereby the battery pack 1000 can be packaged.

[0062] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0063] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0064] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0066] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cold plate assembly, characterized in that: include: a cold plate, wherein a cooling channel is defined in the cold plate; The bus bar is arranged on one side of the cold plate in the thickness direction and is fixedly connected to the cold plate.

2. The cold plate assembly according to claim 1, characterized in that A mounting groove is formed on one side surface of the cold plate in the thickness direction, and the busbar is arranged in the mounting groove.

3. The cold plate assembly according to claim 1, characterized in that The cold plate is an injection molded part, and the busbar is embedded in the cold plate.

4. The cold plate assembly according to any one of claims 1 to 3, characterized in that: Also includes: A signal acquisition unit, the signal acquisition unit is used to collect temperature and current data on the bus, the signal acquisition unit and the bus are located on the same side of the cold plate, the signal acquisition unit includes a flexible circuit board and a signal acquisition part, the flexible circuit board is fixed on the cold plate, and the signal acquisition part is connected to the bus.

5. The cold plate assembly according to claim 4, characterized in that The signal acquisition unit is opposite to the cooling channel.

6. The cold plate assembly according to claim 1, characterized in that There are a plurality of cooling channels, each of which extends along the length direction of the cold plate, and the plurality of cooling channels are arranged at intervals in the width direction of the cold plate; The cold plate assembly also includes: a first collector and a second collector, the first collector and the second collector extend along the width direction of the cold plate and are respectively connected to the two ends of the cold plate in the length direction, the first collector cooperates with the cold plate to define a first flow channel connected to the multiple cooling flow channels, and the second collector and the cold plate define a second flow channel connected to the multiple cooling flow channels.

7. A battery pack, characterized in that: include: A battery cell, wherein the battery cell is provided with a pole; The cold plate assembly according to any one of claims 1 to 6, wherein the cold plate assembly cover is arranged on a side of the battery cell where the pole is arranged, and the busbar is connected to the pole.

8. The battery pack according to claim 7, characterized in that: An operation hole is formed on the cold plate and penetrates the cold plate in a thickness direction. The operation hole is opposite to the bus bar, and the bus bar is connected to the pole by welding.

9. The battery pack according to claim 8, characterized in that: Also includes: A heat-conducting material piece is filled in the operation hole.

10. The battery pack according to claim 9, characterized in that: An explosion-proof valve is provided on a side of the battery cell facing the cold plate, and the explosion-proof valve is opposite to the cooling flow channel.

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