Battery pack heat management structure and battery pack

Abstract

The utility model provides a battery pack thermal management structure and battery pack, the battery pack thermal management structure is assembled between the upper shell and the lower shell of the battery pack shell, the battery pack shell is communicated with a liquid inlet pipe and a liquid outlet pipe, the structure comprises: a flow control member, which is formed by a plate body perpendicular to the bottom plate of the lower shell and connected with the bottom plate of the lower shell, after being bent, the elastic sheets are connected with the two symmetrical side walls of the upper shell and the two corresponding symmetrical side walls of the lower shell; the battery pack shell is divided into a first cavity and a second cavity; the first cavity is used for accommodating a module and is communicated with the liquid inlet pipe; the second cavity is communicated with the liquid outlet pipe and is similar to a U shape; and the top end of the plate body is higher than a through groove formed in the module, so that the first cavity is communicated with the second cavity. The battery module disclosed by the utility model has the effect of improving the service life of a battery pack by improving the circulation amount of a cooling medium among the battery cells of the module, reducing the temperature difference among the battery cells and reducing the temperature of the battery module.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal management of battery packs, and in particular to a thermal management structure of a battery pack and a battery pack. Background Art

[0002] To meet the demand for fast charging of battery packs, the charging rate of battery packs needs to be continuously improved. At this time, the heat generated by the modules in the battery pack continues to increase, which puts higher requirements on the design of the thermal management system. The indirect single-sided cooling method is difficult to meet the design requirements; and the multi-sided cooling method is costly. In the context of increasingly fierce cost competition, it is not suitable for large-scale promotion.

[0003] In the related technologies, the immersion battery pack thermal management method has a more obvious cooling effect than the single-sided or multi-sided cooling method. The immersion battery pack thermal management method is an innovative battery thermal management technology, which directly immerses the battery pack or battery module in the coolant, and uses the high thermal conductivity of the coolant to absorb and take away the heat generated by the battery, thereby keeping the battery within a suitable operating temperature range. In order to maximize the energy density of the battery pack, the gap between the cells during the module stacking process is about 1-2mm, and the gap between the module and the shell is basically between 10-15mm. For this reason, the circulating cooling medium circulates more through the gap between the module and the shell, and less circulates between the cells, resulting in high module temperature and a large temperature difference between the cells. Utility Model Content

[0004] In view of this, the utility model aims to propose a thermal management structure for a battery pack to increase the flow rate of cooling medium between battery cells in the module, reduce the temperature difference between battery cells, lower the temperature of the battery module, and thus increase the service life of the battery pack.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A battery pack thermal management structure is assembled between an upper shell and a lower shell of a battery pack housing, wherein the battery pack housing is connected with a liquid inlet pipe and a liquid outlet pipe, and comprises:

[0007] The flow control member is composed of a plate body which is perpendicular to and connected to the bottom plate of the lower shell, and is connected to the two symmetrical side walls of the upper shell and the two corresponding symmetrical side walls of the lower shell after being bent;

[0008] The battery pack shell is separated into a first chamber that accommodates the module and communicates with the liquid inlet pipe and a second chamber that is in a U-shape and communicates with the liquid outlet pipe; and

[0009] A through groove is formed at the top of the plate body above the module to connect the first chamber and the second chamber.

[0010] Further, the gap between the two symmetric side plates of the flow control member and the module is 3-5 mm.

[0011] Further, the through groove includes a first through groove and a second through groove opened at both ends of the plate body.

[0012] Further, the first through groove and the second through groove are 3 mm - 5 mm higher than the module.

[0013] Further, the opening widths of the first through groove and the second through groove are both less than 1 / 3 of the length of the side plate.

[0014] Further, the through groove further includes a third through groove opened at the center of the plate body, and the opening position of the third through groove is 3 mm - 5 mm higher than that of the first through groove and the second through groove.

[0015] Further, connectors are respectively arranged between the two ends of the plate body in the length direction and the battery pack housing, and between the plate body and the top plate of the upper shell to form a plug-in connection between the plate body and the battery pack housing.

[0016] Further, the connector includes:

[0017] A connection strip connected to the inner wall of the battery pack housing, and a slot for inserting the plate body opened along the length direction of the connection strip.

[0018] Further, a sealing strip is arranged in the slot.

[0019] Compared with the prior art, the present utility model has the following advantages:

[0020] For the battery pack thermal management structure of the present utility model, by arranging a flow control member in the battery pack housing, the space in the battery pack housing is divided into a first chamber and a second chamber, so as to adjust the gap between the plate body and the module. Further, when the coolant is introduced into the first chamber through the liquid inlet pipe, it will flow along the gap between the plate body and the module and then along the gap between the battery cells, achieving the effects of increasing the coolant flow rate between the battery cells, reducing the temperature difference between the battery cells, reducing the temperature of the battery module, and increasing the service life of the battery pack.

[0021] After the coolant is introduced into the first chamber, it will only flow from the through groove to the second chamber when the liquid level of the coolant is higher than the height of the through groove. Such a setting can facilitate the complete immersion of the module in the coolant and can also facilitate the discharge of the gas in the battery pack module.

[0022] By adjusting the distance between the side plate and the module to 3 - 5 mm, the coolant can be adjusted to flow between the module and the flow control part, and the flow resistance of the coolant when flowing between the side plate and the module is increased, so that the coolant flows between the battery cells. While ensuring the coolant flow rate, more coolant can flow between the battery cells, which has the effect of reducing the temperature difference between the battery cells and improving the service life of the battery pack.

[0023] The first through - groove and the second through - groove are opened at both ends of the plate body, that is, on the side of the side plate close to the flow control part. Along the length direction of the liquid inlet pipe, that is, along the main liquid inlet direction of the coolant, when the coolant completely immerses the module, along the liquid inlet direction, the coolant turns back from the rear to the front above the module to the liquid inlet side of the coolant, realizing the complete immersion of the module.

[0024] The first through - groove and the second through - groove are 3 - 5 mm higher than the module, which can ensure that when there are assembly errors or tolerances in the module, the module can be completely in the coolant, ensuring the cooling effect of the battery module and improving the service life of the battery pack.

[0025] By setting the opening width of the first through - groove and the second through - groove to be less than 1 / 3 of the length of the side plate, it is ensured that the coolant can flow back circuitously along the main liquid inlet direction of the coolant. At the same time, such a setting of the first through - groove and the second through - groove can facilitate the flow of the coolant to the second chamber to complete the circulation of the coolant in the battery pack housing.

[0026] By setting the third through - groove higher than the first through - groove and the second through - groove, when the module is completely immersed and the coolant flow rate in the battery pack housing increases, the coolant flows from the third through - groove into the second chamber, thereby realizing the adjustment of the coolant flow rate.

[0027] By setting the connecting piece, the detachable connection between the plate body and the battery pack housing is realized, and connecting pieces are provided at both ends of the plate body and at the top plate of its upper shell, realizing the improvement of the connection stability between the plate body and the battery pack housing and avoiding shaking under the impact of the coolant.

[0028] By inserting the plate body into the slot of the connecting bar, the disassembly and assembly of the plate body and the battery shell are facilitated. At the same time, by setting the sealing strip, the sealing performance between the plate body and the battery pack housing is improved, thereby preventing the coolant in the first chamber from flowing into the second chamber, so that more coolant flows between the battery cells and between the module and the plate body gap.

[0029] The present utility model also proposes a battery pack, which has a battery pack housing assembled by an upper shell and a lower shell. The battery pack housing is connected with a liquid inlet pipe and a liquid outlet pipe, and the battery pack heat management structure as described above is arranged in the battery pack housing; both the liquid outlet pipe and the liquid inlet pipe are connected with the lower shell.

[0030] By arranging the battery pack thermal management structure described above inside the battery pack housing, the liquid inlet pipe can be connected to the first chamber and the liquid outlet pipe can be connected to the second chamber. There is no need to connect the liquid outlet pipe to the top of the housing to facilitate the discharge of air inside the battery pack housing. This has the effect of facilitating the connection of the liquid outlet pipe to the battery pack housing and discharging the gas inside the battery pack housing. At the same time, since there is no restriction on the installation position of the liquid outlet pipe, it is convenient to arrange the liquid outlet pipe, improving the applicability of the battery pack during assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings forming a part of this utility model are used to provide a further understanding of this utility model. The schematic embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model. In the drawings:

[0032] Figure 1 is a schematic diagram of the overall structure of an embodiment of this utility model;

[0033] Figure 2 is a diagram showing the positional relationship of the flow control member located inside the lower housing in an embodiment of this utility model;

[0034] Figure 3 is a top view showing the first chamber and the second chamber in an embodiment of this utility model;

[0035] Figure 4 is a schematic diagram showing the relative positions of the through slot, the plate body and the module in an embodiment of this utility model;

[0036] Figure 5 is a schematic diagram showing the module in an embodiment of this utility model;

[0037] Figure 6 is a schematic diagram showing the connecting member in an embodiment of this utility model;

[0038] Figure 7 is an embodiment of this utility model Figure 6 partial enlarged schematic diagram of part A;

[0039] Figure 8 is a schematic diagram showing the layout position of the connecting member on the upper housing in an embodiment of this utility model.

[0040] Description of reference numerals: 1. Flow control member;

[0041] 101. Plate body; 1011. Side plate; 1012. Partition plate;

[0042] 2. Through slot;

[0043] 2a. First through slot; 2b. Second through slot; 2c. Third through slot;

[0044] 3. Battery pack housing;

[0045] 301, upper shell; 302, lower shell; 303, liquid inlet pipe; 304, liquid outlet pipe;

[0046] 3a, first chamber; 3b, second chamber;

[0047] 4, connecting member;

[0048] 41, connecting bar; 411, reinforcing portion; 412, insertion portion; 42, slot; 43, sealing strip;

[0049] 5, module. Detailed implementation manners

[0050] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0051] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0052] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connecting member" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0053] The present utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0054] Embodiment 1

[0055] This embodiment relates to a battery pack thermal management structure, in order to increase the flow rate of the cooling medium between the battery cells of the module 5, reduce the temperature difference between the battery cells, and lower the temperature of the battery module 5, so as to improve the service life of the battery pack.

[0056] In terms of the overall structure, as Figures 1 to 4As shown in the figure, the battery pack thermal management structure is assembled between the upper shell 301 and the lower shell 302 of the battery pack housing 3. The battery pack housing 3 is connected with a liquid inlet pipe 303 and a liquid outlet pipe 304. The battery pack thermal management structure includes: a flow control member 1, which is composed of a plate body 101 perpendicular to and connected to the bottom plate of the lower shell 302, and after being bent, is connected to two symmetric side walls of the upper shell 301 and two corresponding symmetric side walls of the lower shell 302; so that the battery pack housing 3 is spaced into a first chamber 3a for accommodating the module 5 and communicating with the liquid inlet pipe 303 and a second chamber 3b in a U-shaped form communicating with the liquid outlet pipe 304; and, a through groove 2 opened at the top of the plate body 101 higher than the module 5 to constitute the communication between the first chamber 3a and the second chamber 3b.

[0057] By arranging the flow control member 1 in the battery pack housing 3, the space in the battery pack housing 3 is divided into a first chamber 3a and a second chamber 3b, realizing the adjustment of the gap between the plate body 101 and the module 5. Since the arrangement of the flow control member 1 increases the flow resistance of the coolant between the plate body 101 and the module 5, when the coolant is introduced into the first chamber 3a from the liquid inlet pipe 303, it will flow along the gap between the plate body 101 and the module 5 and along the gap between the battery cells, achieving the effects of increasing the coolant flow rate between the battery cells, reducing the temperature difference between the battery cells, reducing the temperature of the battery module 5, and increasing the service life of the battery pack.

[0058] Only when the liquid level of the coolant is higher than the height of the through groove 2 after the coolant is introduced into the first chamber 3a, will it flow from the through groove 2 to the second chamber 3b. Such an arrangement can facilitate the complete immersion of the module 5 in the coolant and can facilitate the discharge of the gas in the battery pack module 5.

[0059] Based on the above overall introduction, as Figures 2 to 4 shown, during the stacking process of the module 5 in this embodiment, the gap between the battery cells is about 1 - 2 mm, and the gap between the module 5 and the battery pack housing 3 basically remains 10 mm - 15 mm. The plate body 101 is placed in the gap between the module 5 and the battery pack housing 3. When the plate body 101 is assembled into the battery pack housing 3, the side wall of the plate body 101 close to the bottom plate of the lower shell 302 abuts against the bottom plate of the lower shell 302 and realizes sealing with the lower shell 302; and there is a distance of 1 - 2 mm between the lower surface of the top plate of the plate body 101 and the upper shell 301. Such an arrangement can prevent the interference between the plate body 101 and the upper shell 301 caused by the tolerances existing in the assembly or component production process, and has the effect of facilitating the assembly of the plate body 101 in the battery pack housing 3.

[0060] For the purpose of adjusting the flow resistance between the flow control member 1 and the module 5, as Figures 2 to 5As shown in the figure, the flow control member 1 includes side plates 1011 and a partition plate 1012. The side plates 1011 are located on both sides of the module 5, forming a clamping of the module 5 and capable of adjusting the distance between it and the module 5. The partition plate 1012 connects the two side plates 1011 to form a U-shaped flow control member 1. The gap between the two symmetric side plates 1011 of the flow control member 1 and the module 5 is 3 mm - 5 mm. When covers are provided on both sides of the module 5, flow holes are opened on the covers. At this time, the distance between the side plates 1011 and the covers is 3 mm - 5 mm. By adjusting the distance between the side plates 1011 and the module 5 to 3 - 5 mm, the coolant can be adjusted to flow between the module 5 and the flow control member 1, and the flow resistance of the coolant when flowing between the side plates 1011 and the module 5 is increased, so that the coolant flows between the battery cells. While ensuring the coolant flow rate, more of it flows between the battery cells, which has the effect of reducing the temperature difference between the battery cells and increasing the service life of the battery pack.

[0061] It can be understood that when the distance between the side plates 1011 and the module 5 is less than 3 mm, the flow resistance of the coolant when flowing between the flow control member 1 and the module 5 is too large, resulting in too small a flow rate of the coolant per unit time, and the overall battery pack cannot be cooled well; when the distance between the side plates 1011 and the module 5 is greater than 5 mm, the flow resistance of the coolant when flowing between the flow control member 1 and the module 5 is too small. At this time, the coolant in the first chamber 3a flows more smoothly between the flow control member 1 and the module 5 and is not easily introduced into the gap between adjacent battery cells. As a result, there is a temperature difference between the battery cells, and the battery pack dissipates heat unevenly, affecting the battery life.

[0062] Based on the above purposes, it can be understood that when the distance between the battery cells of the module 5 is greater than 1 - 2 mm, or when the distance between the module 5 and the battery pack housing 3 is adjusted, the distance between the side plates 1011 and the module 5 can be adjusted accordingly to achieve the flow resistance of the coolant when passing through the gap between the adjusted module 5 and the flow control member 1. To facilitate the complete immersion of the coolant in the module 5, the through groove 2 includes a first through groove 2a and a second through groove 2b opened at both ends of the plate body 101. The height of the first through groove 2a and the second through groove 2b above the module 5 is 3 mm - 5 mm. And the opening widths of the first through groove 2a and the second through groove 2b are both less than 1 / 3 of the length of the side plates 1011.

[0063] The first through groove 2a and the second through groove 2b are opened at both ends of the plate body 101, that is, on the side of the side plate 1011 close to the flow control member 1. Along the length direction of the liquid inlet pipe 303, that is, along the main liquid inlet direction of the coolant, when the coolant completely immerses the module 5, along the liquid inlet direction, the coolant folds back from the rear to the front above the module 5 to the liquid inlet side of the coolant, so as to completely immerse the module 5. By setting the height of the first through groove 2a and the second through groove 2b higher than the module 5 by 3 mm - 5 mm, when there is an assembly error or tolerance in the module 5, the module 5 can be completely in the coolant, ensuring the cooling effect of the battery module 5 and improving the service life of the battery pack. By setting the opening width of the first through groove 2a and the second through groove 2b to be less than 1 / 3 of the length of the side plate 1011, it is ensured that the coolant can flow back circuitously along the main liquid inlet direction of the coolant. At the same time, setting the first through groove 2a and the second through groove 2b in this way can facilitate the flow of the coolant from here to the second chamber 3b to complete the circulation of the coolant in the battery pack housing 3.

[0064] In order to facilitate the adjustment of the flow rate of the coolant in the battery pack housing 3, the through groove 2 further includes a third through groove 2c opened at the center of the plate body 101, and the height of the opening position of the third through groove 2c is 3 mm - 5 mm higher than that of the first through groove 2a and the second through groove 2b. By setting the third through groove 2c higher than the first through groove 2a and the second through groove 2b, when the module 5 is completely immersed and the coolant flow rate in the battery pack housing 3 increases, the coolant flows from the third through groove 2c into the second chamber 3b, thereby realizing the adjustment of the flow rate of the coolant.

[0065] In order to facilitate the connection between the flow control member 1 and the battery pack housing 3 and ensure the connection stability between the battery pack housing 3 and the flow control member 1, as Figure 3 and Figures 6 to 8 shown, connection members 4 are respectively arranged between the two ends of the plate body 101 in the length direction and the battery pack housing 3, and between the plate body 101 and the top plate of the upper shell 301 to form a plug-in connection between the plate body 101 and the battery pack housing 3. The length of the connection member 4 between the two ends of the plate body 101 in the length direction and the battery pack housing 3 is the same as the height of the battery pack housing 3, that is, when the lower shell 302 and the upper shell 301 are assembled together, the connection members 4 between the lower shell 302 and the upper shell 301 are connected to each other and extend from the bottom plate of the lower shell 302 to the top plate of the upper shell 301; the length of the connection member 4 on the top plate of the housing is not less than 75% of the overall length of the single-side side plate 1011. Of course, when the length of the connection member 4 is less than 75% of the length of the side plate 1011 and still can ensure the stable connection between the top edge of the flow control member 1 and the upper shell 301, it can also be used as an implementation manner of the embodiment of the present application.

[0066] Based on the above purpose, the connector 4 includes: a connector strip 41 connected to the inner wall of the battery pack shell 3, and a slot 42 opened along the length direction of the connector strip 41 for the board 101 to be inserted. A sealing strip 43 is arranged in the slot 42. The connector 4 is provided to realize the detachable connection between the board 101 and the battery pack shell 3, and the connector 4 is provided at both ends of the board 101 and at the top plate of the upper shell 301, so as to improve the connection stability between the board 101 and the battery pack shell 3 and avoid shaking under the impact of the coolant. By inserting the board 101 into the slot 42 of the connector strip 41, it is convenient to realize the disassembly and assembly of the board 101 and the battery shell, and at the same time, the sealing strip 43 is provided to improve the sealing between the board 101 and the battery pack shell 3, thereby preventing the coolant in the first chamber 3a from flowing into the second chamber 3b, so that more coolant flows to the gap between the battery cells and between the module 5 and the board 101.

[0067] Specifically, the sealing strip 43 can be made of rubber or silicone as raw materials, and the compression of the sealing strip 43 in the direction of the extrusion force is controlled within 15% to 20%. As a preferred embodiment, the connecting strip 41 includes a reinforcing portion and a plug-in portion 412, the reinforcing portion is plate-shaped, and the plug-in portion 412 is strip-shaped. The plug-in portion 412 is fixedly connected to the side of the reinforcing portion away from the battery pack shell 3, and the slot 42 is opened in the plug-in portion 412. The connecting strip 41 configured in this way increases the connection stability between it and the battery pack, so that the flow control component 1 will not shake when impacted by the coolant, thereby ensuring the flow resistance of the coolant between the module 5 and the flow control component 1.

[0068] When the thermal management structure of the battery pack of this embodiment is used, the module 5 and other components required for the battery pack are first placed in the battery pack housing 3, and then the flow control member 1 is connected to the lower shell 302 using the connector 4. After the upper shell 301 is covered and the upper shell 301 is connected to the lower shell 302, the flow control member 1 is installed. By arranging the flow control member 1 in the battery pack housing 3, the space in the battery pack housing 3 is divided into a first chamber 3a and a second chamber 3b, so as to adjust the gap between the plate 101 and the module 5. Since the setting of the flow control member 1 increases the flow resistance of the coolant between the plate 101 and the module 5, when the coolant is passed into the first chamber 3a through the liquid inlet pipe 303, it will flow along the gap between the plate 101 and the module 5 and along the gap between the battery cells, so as to increase the flow rate of the coolant between the battery cells, reduce the temperature difference between the battery cells, reduce the temperature of the battery module 5, and increase the service life of the battery pack.

[0069] Embodiment 2

[0070] This embodiment relates to a battery pack, which has a battery pack housing 3 assembled by an upper case 301 and a lower case 302. The battery pack housing 3 is communicated with a liquid inlet pipe 303 and a liquid outlet pipe 304, and the above-mentioned battery pack thermal management structure is arranged in the battery pack housing 3; both the liquid outlet pipe 304 and the liquid inlet pipe 303 are communicated with the lower case 302.

[0071] By arranging the above-mentioned battery pack thermal management structure in the battery pack housing 3, it is only necessary to make the liquid inlet pipe 303 communicate with the first chamber 3a and the liquid outlet pipe 304 communicate with the second chamber 3b. There is no need to connect the liquid outlet pipe 304 to the top of the housing to facilitate the discharge of air in the battery pack housing 3. It has the effects of facilitating the connection of the liquid outlet pipe 304 with the battery pack housing 3 and facilitating the discharge of gas in the battery pack housing 3. At the same time, since the installation position of the liquid outlet pipe 304 is not restricted, it is convenient to arrange the liquid outlet pipe 304, thereby improving the applicability of the battery pack during assembly.

[0072] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery pack thermal management structure, assembled between an upper shell and a lower shell of a battery pack shell, wherein the battery pack shell is connected to a liquid inlet pipe and a liquid outlet pipe, characterized in that: include: The flow control member is composed of a plate body which is perpendicular to and connected to the bottom plate of the lower shell, and is connected to the two symmetrical side walls of the upper shell and the two corresponding symmetrical side walls of the lower shell after being bent; The battery pack shell is separated into a first chamber that accommodates the module and communicates with the liquid inlet pipe and a second chamber that is in a U-shape and communicates with the liquid outlet pipe; and A through groove is formed at the top of the plate body above the module to connect the first chamber and the second chamber.

2. The thermal management structure of the battery pack according to claim 1, characterized in that: The gap between the two symmetrical side plates of the flow control component and the module is 3-5 mm.

3. The thermal management structure of the battery pack according to claim 2, characterized in that: The through slot includes a first through slot and a second through slot opened at two ends of the plate body.

4. The thermal management structure of the battery pack according to claim 3, characterized in that: The first through slot and the second through slot are 3 mm to 5 mm higher than the module.

5. The thermal management structure of the battery pack according to claim 3, characterized in that: The widths of the first through slot and the second through slot are both smaller than 1 / 3 of the length of the side plate.

6. The thermal management structure of the battery pack according to claim 3, characterized in that: The through groove further includes a third through groove opened at the center of the plate body, and the opening position of the third through groove is 3mm-5mm higher than the first through groove and the second through groove.

7. The thermal management structure of the battery pack according to claim 1 or 2, characterized in that: Connectors are respectively provided between the two ends of the plate body in the length direction and the battery pack shell, and between the plate body and the top plate of the upper shell, so as to form a plug-in connection between the plate body and the battery pack shell.

8. The thermal management structure of the battery pack according to claim 7, characterized in that: The connecting piece comprises: A connecting strip connected to the inner wall of the battery pack shell, and a slot opened along the length direction of the connecting strip for the plate body to be inserted into.

9. The thermal management structure of the battery pack according to claim 8, characterized in that: A sealing strip is arranged in the slot.

10. A battery pack, comprising a battery pack housing assembled from an upper shell and a lower shell, wherein the battery pack housing is connected to a liquid inlet pipe and a liquid outlet pipe, characterized in that: The battery pack shell is provided with a battery pack thermal management structure as claimed in any one of claims 1 to 9; The liquid outlet pipe and the liquid inlet pipe are both communicated with the lower shell.

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