Liquid-cooled battery module and battery pack

Abstract

The utility model discloses a liquid-cooled battery module and a battery pack, the liquid-cooled battery module comprises a plurality of battery cells, a plurality of heat exchange assemblies and a fixing assembly, and the plurality of battery cells are arranged in a multi-row and multi-column manner; the multiple heat exchange assemblies are arranged between every two adjacent rows or columns of the battery cells, the surfaces of the two sides of each heat exchange assembly make contact with the opposite faces of the corresponding battery cells, heat exchange flow channels are formed in the heat exchange assemblies, and the multiple heat exchange flow channels communicate with one another; and the fixing assembly is arranged at the periphery of the plurality of battery cells and is used for assembling the plurality of battery cells into the battery module. Compared with the prior art, the liquid-cooled battery module and the battery pack provided by the utility model can solve the technical problem that the cycle service life of the battery cell is influenced due to lower heat exchange efficiency between the battery cell and the liquid-cooled plate in the existing liquid-cooled battery module and the battery pack.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid-cooled batteries, and particularly relates to a liquid-cooled battery module and a battery pack. Background Art

[0002] Most traditional liquid-cooled battery modules and battery packs only set a liquid-cooled plate at the bottom of the battery cells, and the heat of the battery cells is exchanged with the liquid-cooled plate through thermal conductive glue. For example, the "Three-sided liquid-cooled structure for battery module and battery module" disclosed in the Chinese utility model patent with the authorization announcement number CN217848077U. However, due to the large amount of heat generated by the battery cells during cyclic charging and discharging, and in the prior art, only heat exchange is carried out between the thermal conductive glue and the liquid-cooled plate at the bottom of the battery cells, there is a problem of low heat exchange efficiency between the thermal conductive glue and the liquid-cooled plate, which affects the cycle life of the battery cells; in addition, the existing glue coating scheme also poses a great test on the stability of the glue coating equipment, and poor glue coating effect will also affect its thermal conductivity, thus aggravating the problem of low heat exchange efficiency. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the above technical deficiencies, and propose a liquid-cooled battery module and a battery pack to solve the technical problem that the heat exchange efficiency between the battery cells and the liquid-cooled plate in the existing liquid-cooled battery module and battery pack is relatively low, which affects the cycle service life of the battery cells.

[0004] To solve the above technical problems, the technical solution of the utility model is as follows:

[0005] In a first aspect, the utility model provides a liquid-cooled battery module, including:

[0006] A plurality of battery cells, and the plurality of battery cells are arranged in a multi-row and multi-column manner;

[0007] A plurality of heat exchange components, and the plurality of heat exchange components are respectively arranged between every two adjacent rows or columns of the battery cells, and the two side surfaces of the heat exchange component are respectively in contact with the opposite surfaces of the corresponding battery cells, and the heat exchange component has a heat exchange flow channel inside, and the plurality of heat exchange flow channels are interconnected;

[0008] A fixing component, and the fixing component is arranged outside the plurality of battery cells and is used for assembling the plurality of battery cells into a battery module.

[0009] In some embodiments, each heat exchange component includes a heat exchange plate and two thermal conductive pads, the two thermal conductive pads are respectively arranged on both sides of the heat exchange plate, and the outer side surfaces are respectively in contact with the opposite side surfaces of every two adjacent rows or columns of the battery cells, and at least one heat exchange flow channel is formed inside the heat exchange plate.

[0010] In some embodiments, the heat exchange flow channels are arranged through the heat exchange plate in the length direction thereof, heat exchange medium inlets and heat exchange medium outlets are respectively formed at two ends of the heat exchange flow channels, and a plurality of the heat exchange medium inlets are connected in parallel and a plurality of the heat exchange medium outlets are connected in parallel.

[0011] In some embodiments, each heat exchange assembly further includes a mounting plate, a liquid inlet pipe and a liquid outlet pipe. The mounting plates are respectively fixed at two ends of the heat exchange plate, mounting holes are formed in the middle of the mounting plates, the liquid inlet pipe and the liquid outlet pipe are respectively arranged in the mounting holes at the same end, a plurality of the heat exchange medium inlets are connected in parallel to the liquid inlet pipe, and a plurality of the heat exchange medium outlets are connected in parallel to the liquid outlet pipe.

[0012] In some embodiments, the fixing assembly includes end plates and steel belts. The end plates are respectively arranged on a set of opposite side edges of the battery module, and the steel belts are sleeved on the upper and lower ends of the periphery of the battery module and located outside the two end plates.

[0013] In a second aspect, the present utility model provides a liquid-cooled battery pack, which includes a lower box body and the liquid-cooled battery module described in the first aspect of the present utility model, and the bottom surface of the liquid-cooled battery module is arranged on the upper surface of the lower box body.

[0014] In some embodiments, at least one liquid-cooling flow channel is formed inside the lower box body, a cooling medium inlet and a cooling medium outlet are respectively formed at two ends of the liquid-cooling flow channel, and a plurality of the cooling medium inlets are connected in parallel and a plurality of the cooling medium outlets are connected in parallel.

[0015] In some embodiments, an inlet liquid main pipe and an outlet liquid main pipe are further included. The inlet liquid main pipe and the outlet liquid main pipe are respectively arranged on two sides of the upper surface of the lower box body, a plurality of the cooling medium inlets are connected in parallel to the inlet liquid main pipe, a plurality of the cooling medium outlets are connected in parallel to the outlet liquid main pipe, and a plurality of the liquid inlet pipes are connected in parallel to the inlet liquid main pipe, and a plurality of the liquid outlet pipes are connected in parallel to the outlet liquid main pipe, so that the heat exchange flow channels are communicated with the liquid-cooling flow channels.

[0016] In some embodiments, a heat-conducting adhesive layer is further included, and the heat-conducting adhesive layer is coated on the upper surface of the lower box body.

[0017] In some embodiments, an upper cover is further included. The upper cover has a receiving cavity for placing the liquid-cooled battery module, and the bottom of the upper cover is fixedly connected to the lower box body.

[0018] Compared with the prior art, the beneficial effects of the present utility model mainly include:

[0019] A liquid-cooled battery module and a battery pack provided by the present utility model add a plurality of heat exchange components on the basis of the traditional heat dissipation only on the bottom surface of the battery cells, and the heat exchange components are arranged between the battery cells, and both side surfaces thereof are respectively in contact with the side surfaces of the battery cells. In this way, heat exchange can be carried out on the side surfaces of each battery cell, increasing the heat exchange area, so that the heat dissipation efficiency of the battery cells can be significantly improved, thereby extending the cycle service life of the battery cells. In addition, the greatly improved heat dissipation efficiency makes up for the reduction in the heat dissipation effect of the thermal conductive adhesive caused by the influence of the stability of the gluing equipment on the gluing quality in the prior art, ensuring the heat dissipation efficiency of the battery module and the battery pack. Description of the Drawings

[0020] Figure 1 is the overall structural schematic diagram of the liquid-cooled battery module of the present utility model;

[0021] Figure 2 is the structural schematic diagram of the heat exchange plate of the present utility model;

[0022] Figure 3 is the overall structural schematic diagram of the liquid-cooled battery pack of the present utility model;

[0023] Figure 4 is Figure 3 the exploded view of;

[0024] Figure 5 is the structural schematic diagram of the lower box body of the present utility model.

[0025] The description of the reference numerals is as follows:

[0026] 100, liquid-cooled battery module, 110, battery cell, 120, heat exchange component, 121, heat exchange plate, 122, mounting plate, 123, inlet pipe, 124, outlet pipe, 130, fixing component, 131, end plate, 132, steel strip;

[0027] 200, lower box body;

[0028] 300, upper cover;

[0029] 400, inlet main pipe;

[0030] 500, outlet main pipe. Detailed Embodiments

[0031] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0032] In view of the technical problem that only the bottom of the battery cells is cooled in the existing liquid-cooled battery pack, resulting in low efficiency of the battery cells in the battery pack and affecting the cycle service life of the battery cells, the utility model provides a liquid-cooled battery module and a battery pack, which increase heat dissipation on the side of the battery cells to improve the heat dissipation efficiency and achieve the purpose of extending the cycle service life of the battery cells.

[0033] As Figure 1 shown, in the first aspect, the utility model provides a liquid-cooled battery module 100, which includes a plurality of battery cells 110, a plurality of heat exchange components 120 and a fixing component 130. The plurality of battery cells 110 are arranged together in a multi-row and multi-column manner, and then are assembled into a liquid-cooled battery module 100 by the fixing component 130 disposed around the plurality of battery cells 110; the plurality of heat exchange components 120 are respectively disposed between every two adjacent rows or columns of the battery cells 110, and the two side surfaces of the heat exchange component 120 are respectively in contact with the opposite surfaces of the corresponding battery cells 110 for dissipating heat from the side surfaces of the battery cells 110; the heat exchange component 120 has a heat exchange flow channel inside for circulating a heat exchange medium (coolant medium), and the plurality of heat exchange flow channels are interconnected.

[0034] In the utility model, there are 12 battery cells 110 in total, which are bundled together in three rows and four columns by the fixing component 130, and then two heat exchange components 120 are provided. When the heat exchange medium is injected into the heat exchange flow channel, heat exchange can be carried out with the two side surfaces of the battery cells 110 during the process of the heat exchange medium flowing from the inlet side of the heat exchange flow channel to the outlet side. As is well known, the side surface area of the battery cells 110 is large. Therefore, by dissipating heat from the side surfaces of the battery cells 110, a large amount of heat generated by the battery cells 110 can be taken away. Compared with the existing method of dissipating heat from the bottom of the battery cells 110, it has the advantage of high heat dissipation efficiency, thereby being able to extend the cycle service life of the battery cells 110.

[0035] In addition, the greatly improved heat dissipation efficiency also makes up for the reduction in the heat dissipation effect of the thermal conductive adhesive caused by the influence of the stability of the gluing equipment on the gluing quality in the prior art, ensuring the heat dissipation efficiency of the battery module and the battery pack.

[0036] It can be understood that the plurality of heat exchange flow channels in the utility model can be connected in parallel, in series, or in a form with both parallel and series connections; specifically, it can be designed according to actual requirements.

[0037] In one embodiment, the heat exchange component 120 includes a heat exchange plate 121 and two heat conductive pads (not shown in the figure). The two heat conductive pads are respectively disposed on both sides of the heat exchange plate 121, and the outer side surfaces are respectively in contact with the opposite side surfaces of every two adjacent rows or columns of the battery cells 110. The arrangement of the heat conductive pads on both sides of the heat exchange plate 121 can promote heat exchange between the heat exchange plate 121 and the battery cells 110.

[0038] In one embodiment, as Figure 2 shown, at least one heat exchange channel is formed inside the heat exchange plate 121, and the heat exchange channel runs through along the length direction of the heat exchange plate 121. Heat exchange medium inlets and heat exchange medium outlets are respectively formed at both ends of the heat exchange channel, and a plurality of the heat exchange medium inlets are connected in parallel and a plurality of the heat exchange medium outlets are connected in parallel.

[0039] In one embodiment, the heat exchange assembly 120 further includes a mounting plate 122, a liquid inlet pipe 123 and a liquid outlet pipe 124. The mounting plate 122 is respectively fixed at both ends of the heat exchange plate 121. Mounting holes are formed in the middle of the mounting plate 122. The liquid inlet pipe 123 and the liquid outlet pipe 124 are respectively arranged in the mounting holes at the same end. A plurality of the heat exchange medium inlets are connected in parallel to the liquid inlet pipe 123, and a plurality of the heat exchange medium outlets are connected in parallel to the liquid outlet pipe 124.

[0040] In the above solution, by injecting a heat exchange medium into the liquid inlet pipe 123, the heat exchange medium can flow into each heat exchange channel through a plurality of heat exchange medium inlets to dissipate heat from the battery cells 110. After heat exchange, the heat exchange medium is collected in the liquid outlet pipe 124 through the heat exchange medium outlets and flows out of the liquid-cooled battery module 100.

[0041] In one embodiment, the fixing assembly 130 includes end plates 131 and steel belts 132. The end plates 131 are respectively arranged on a set of opposite sides of the liquid-cooled battery module 100. The steel belts 132 are sleeved on the upper and lower ends of the periphery of the liquid-cooled battery module 100 and are located outside the two end plates 131.

[0042] In a second aspect, as Figures 3 - 4 shown, the present invention further provides a liquid-cooled battery pack, which includes a lower box body 200 and the liquid-cooled battery module 100 described in the first aspect. The bottom surface of the liquid-cooled battery module 100 is arranged on the upper surface of the lower box body 200.

[0043] In one embodiment, as Figure 5 shown, at least one liquid-cooling channel is formed inside the lower box body 200. Cooling medium inlets and cooling medium outlets are respectively formed at both ends of the liquid-cooling channel, and a plurality of the cooling medium inlets are connected in parallel and a plurality of the cooling medium outlets are connected in parallel.

[0044] That is to say, in addition to heat exchange on the side of the battery cells 110, the present invention also performs heat exchange on the bottom surface of the battery cells 110, and the heat exchange form on the bottom surface is the same as that of the prior art; the heat dissipation on the side and the bottom surface of the battery cells 110 can exist simultaneously, or only the side of the battery cells 110 can be dissipated.

[0045] In one embodiment, for the convenience of simultaneously dissipating heat from the side and bottom surfaces of the battery cell 110, preferably, an inlet liquid main pipe 400 and an outlet liquid main pipe 500 are further included. The inlet liquid main pipe 400 and the outlet liquid main pipe 500 are respectively arranged on both sides of the upper surface of the lower box body 200. A plurality of the cooling medium inlets are connected in parallel to the inlet liquid main pipe 400, a plurality of the cooling medium outlets are connected in parallel to the outlet liquid main pipe 500, and a plurality of the inlet pipes 123 are connected in parallel to the inlet liquid main pipe 400, and a plurality of the outlet pipes 124 are connected in parallel to the outlet liquid main pipe 500, so that the heat exchange flow channel is communicated with the liquid cooling flow channel.

[0046] In one embodiment, a heat-conducting adhesive layer is further arranged between the liquid-cooled battery module 100 and the lower box body 200. The heat-conducting adhesive layer is coated on the upper surface of the lower box body 200 and is used to promote heat exchange between the battery cell 110 and the liquid cooling flow channel of the lower box body 200.

[0047] In one embodiment, an upper cover 300 is further included. The upper cover 300 has a receiving cavity for placing the liquid-cooled battery module 100. The bottom of the upper cover 300 is fixedly connected to the lower box body 200 to form a battery pack.

[0048] The specific embodiments of the present invention described above do not constitute a limitation to the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention should be included within the protection scope of the claims of the present invention.

Claims

1. A liquid-cooled battery module, characterized in that: include: A plurality of battery cells, wherein the plurality of battery cells are arranged in a plurality of rows or columns; A plurality of heat exchange components, wherein the plurality of heat exchange components are respectively arranged between the battery cells of each two adjacent rows or columns, and the two side surfaces of the heat exchange components are respectively in contact with the opposite surfaces of the corresponding battery cells, and the heat exchange components have heat exchange channels inside, and the plurality of heat exchange channels are interconnected; A fixing component is arranged at the periphery of the plurality of battery cells and is used to assemble the plurality of battery cells into a battery module.

2. The liquid-cooled battery module according to claim 1, characterized in that: Each of the heat exchange components includes a heat exchange plate and two thermally conductive pads, the two thermally conductive pads are respectively arranged on both sides of the heat exchange plate, and the outer surfaces are respectively in contact with the opposite sides of the battery cells in each two adjacent rows or columns, and at least one heat exchange channel is formed inside the heat exchange plate.

3. The liquid-cooled battery module according to claim 2, characterized in that: The heat exchange channel is arranged through the length direction of the heat exchange plate, and a heat exchange medium inlet and a heat exchange medium outlet are formed at both ends of the heat exchange channel respectively. A plurality of heat exchange medium inlets are connected in parallel, and a plurality of heat exchange medium outlets are connected in parallel.

4. The liquid-cooled battery module according to claim 3, characterized in that: Each of the heat exchange components further includes a mounting plate, a liquid inlet pipe and a liquid outlet pipe. The mounting plates are respectively fixed to the two ends of the heat exchange plate. A mounting hole is formed in the middle of the mounting plate. The liquid inlet pipe and the liquid outlet pipe are respectively arranged in the mounting hole located at the same end. A plurality of heat exchange medium inlets are connected in parallel to the liquid inlet pipe, and a plurality of heat exchange medium outlets are connected in parallel to the liquid outlet pipe.

5. The liquid-cooled battery module according to claim 1, characterized in that: The fixing assembly includes end plates and steel belts. The end plates are respectively arranged on a group of opposite sides of the battery module. The steel belts are sleeved on the upper and lower ends of the periphery of the battery module and are located outside the two end plates.

6. A liquid-cooled battery pack, characterized in that: It comprises a lower box body and the liquid-cooled battery module according to any one of claims 1 to 5, wherein the bottom surface of the liquid-cooled battery module is arranged on the upper surface of the lower box body.

7. The liquid-cooled battery pack according to claim 6, characterized in that: At least one liquid cooling channel is formed inside the lower box body, and a cooling medium inlet and a cooling medium outlet are respectively formed at both ends of the liquid cooling channel. A plurality of cooling medium inlets are connected in parallel, and a plurality of cooling medium outlets are connected in parallel.

8. The liquid-cooled battery pack according to claim 7, characterized in that: It also includes a liquid inlet main pipe and a liquid outlet main pipe, which are respectively arranged on both sides of the upper surface of the lower box body, multiple cooling medium inlets are connected in parallel to the liquid inlet main pipe, multiple cooling medium outlets are connected in parallel to the liquid outlet main pipe, and multiple liquid inlet pipes are connected in parallel to the liquid inlet main pipe, and multiple liquid outlet pipes are connected in parallel to the liquid outlet main pipe, so that the heat exchange flow channel is connected to the liquid cooling flow channel.

9. The liquid-cooled battery pack according to claim 6, characterized in that: It also includes a heat-conducting adhesive layer, which is coated on the upper surface of the lower box.

10. The liquid-cooled battery pack according to claim 6, characterized in that: It also includes an upper cover, which has a receiving cavity for placing the liquid-cooled battery module, and the bottom of the upper cover is fixedly connected to the lower box body.

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