Battery pack and power device

Abstract

The present invention provides a battery pack and an electrical device, the battery pack comprising a lower shell and at least one row of battery cells; the bottom portion of the lower shell is provided with a slot body arranged corresponding to each row of battery cells, the top of each slot body is provided with an opening, the bottom of each battery cell is provided with a connecting portion for connecting the battery cell to the bottom portion, and the connecting portion is located in the slot body; the bottom of the battery cell can block the opening, and a first cooling channel for cooling medium to flow through is formed in each slot body, and a second cooling channel located at both ends of the first cooling channel is provided in the bottom portion, each first cooling channel is respectively connected to the second cooling channel at the same end, and a liquid inlet is provided on one of the second cooling channels, and a liquid outlet is provided on the other second cooling channel. The battery lower shell of the present invention allows the cooling medium to flow directly through the bottom of the battery cell, which is beneficial to improving the cooling effect on the battery cell, realizing the integration of the cooling channel and the lower shell, eliminating the traditional liquid cooling plate, and thus helping to reduce production costs.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a battery pack. The present invention also relates to an electrical device equipped with the battery pack. Background Art

[0002] With the rapid development of electric vehicles, the demand for high-performance batteries is growing. The heat generated by high-performance batteries has become one of the important factors restricting their performance and life. To solve this problem, more effective battery cooling technology needs to be developed.

[0003] At present, traditional active cooling systems (such as air cooling and liquid cooling systems) have been widely used for battery cooling. These traditional methods have the following disadvantages:

[0004] First, the production cost is high. The manufacture of liquid cooling plates requires the use of precise stamping, welding and other processes, and the production cost itself is high. In addition, the liquid cooling plate also needs to undergo a variety of processes such as high temperature resistance and corrosion resistance, which makes the production and manufacturing difficult and costly.

[0005] Second, the manufacturing process is complicated. The liquid cooling plate and thermal conductive glue need to be pasted on the surface of the battery and in full contact with the surface of the battery cell, which requires workers to carefully install and position them. During manufacturing, a lot of equipment and a lot of manpower are needed, and the work efficiency is low.

[0006] Third, maintenance is difficult. The liquid cooling plate is easily damaged by collision with foreign objects during use, and the liquid cooling plate itself is connected to the battery cell through thermal conductive glue, resulting in high maintenance costs.

[0007] Fourth, uneven heat dissipation. The heat dissipation effect of the liquid cooling plate and thermal conductive glue is affected by factors such as manufacturing and installation, resulting in uneven heat dissipation of the battery. At the same time, the heat dissipation effect of the liquid cooling plate is not as good as the heat dissipation method of injecting cooling medium into the battery cell cavity for circulation.

[0008] Fifth, the impact on the environment. The materials in the liquid cooling plate and thermal conductive adhesive may cause certain pollution to the environment, so they need to undergo cumbersome environmental approval and processing before use.

[0009] Therefore, how to optimize the cooling structure on the battery to improve the cooling effect has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0010] In view of this, the present invention aims to provide a battery pack to improve the cooling effect and reduce the production cost.

[0011] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0012] A battery pack comprises a lower shell and at least one row of battery cells;

[0013] The bottom portion of the lower housing is provided with slots arranged corresponding to the cells in each column, the top of each slot is provided with an opening, the bottom of each cell is provided with a connecting portion for connecting the cell to the bottom portion, and the connecting portion is located in the slot;

[0014] The bottom of the battery cell can block the opening, and a first cooling channel for cooling medium to flow through is formed in each of the slots, and second cooling channels located at both ends of the first cooling channel are provided in the bottom part, and each of the first cooling channels is respectively connected to the second cooling channel at the same end, and a liquid inlet is provided on one of the second cooling channels, and a liquid outlet is provided on the other second cooling channel.

[0015] Further, the battery cell is connected to the tank body by snapping through the connecting portion; and / or,

[0016] A sealing structure is provided between the bottom of each battery cell and the bottom portion, and the sealing structure is used to seal the first cooling channel.

[0017] Furthermore, the connecting portion includes a clamping body arranged at the bottom of the battery cell, and a liquid passage is defined between the clamping body and the bottom of the battery cell, and the liquid in the first cooling channel flows through the liquid passage.

[0018] Furthermore, the bottom part includes a bottom plate, and side beams arranged around the bottom plate and connected to the circumferential frame of the lower shell, the trough bodies are all arranged on the bottom plate, and the second cooling channel is arranged in the side beams.

[0019] Furthermore, the bottom plate includes at least two plate bodies arranged side by side in the side beam, and two adjacent plate bodies are connected via a connecting beam;

[0020] The trough body is arranged on each of the plate bodies, and a connecting channel connecting the first cooling channels on both sides is arranged in the connecting beam.

[0021] Further, the side beam and the connecting beam are both provided with insertion openings on one side facing the plate body, and both ends of the plate body are respectively inserted into the insertion openings at the same end and are respectively welded to the side beam and the connecting beam; and / or,

[0022] A plurality of wiring harness fixing holes are arranged on the top of the side beam.

[0023] Furthermore, the inner wall of the trough body is provided with reinforcing ribs which are arranged on both sides of the opening and extend along the length direction of the trough body;

[0024] A reinforcement cavity is formed between the reinforcement ribs on each side and the inner wall of the tank body, and the cross section of at least one of the reinforcement cavities is triangular.

[0025] Furthermore, a plurality of columns of the battery cells are mounted on the bottom portion, and a heat insulating plate is provided between two adjacent columns of the battery cells.

[0026] Further, the inner walls of the first cooling channel and the second cooling channel are both provided with an insulating layer; and / or,

[0027] The bottom surface of the bottom part is provided with a protective layer and / or a heating layer.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] The battery lower shell described in the present invention forms a first cooling channel in the slot body by arranging multiple slot bodies on the bottom part, the connecting part is connected to the bottom part, and the bottom of the battery cell installed on the bottom part is sealed and opened. Two second cooling channels that are simultaneously connected to the multiple first cooling channels are provided on the bottom part, so that the cooling medium flowing in through the liquid inlet flows into each first cooling channel after flowing into one of the second cooling channels, and cools the battery cell, and finally flows out through the liquid outlet after flowing through another second cooling channel. This method in which the cooling medium directly flows through the bottom of the battery cell is conducive to improving the cooling effect on the battery cell, and the slot body is directly arranged on the lower shell, so as to realize the integration of the cooling channel and the lower shell, eliminate the traditional liquid cooling plate, and thus help reduce production costs.

[0030] In addition, the battery cell is connected to the tank body by a connection part at the bottom, which is conducive to improving the assembly efficiency of the battery cell on the bottom part; by setting a sealing structure, it is conducive to improving the sealing effect between the battery cell and the bottom part, thereby preventing the first cooling channel from leaking. A liquid passage is defined between the clamping body and the battery cell, so that the clamping body has a good clamping effect while ensuring the cooling effect of the cooling medium on the battery cell. The structure of the bottom plate and the side beam is simple and easy to process and form.

[0031] In addition, the bottom plate is connected by a plate body and a connecting beam, which is conducive to adjusting the number of plate bodies according to the use requirements, so as to have good use flexibility, and the connecting channel is conducive to improving the connection between the first cooling channels on both sides. By setting the insertion ports on the side beams and the connecting beams, it is convenient to install the plate body; the setting of multiple cavities on the side beams is conducive to improving the structural strength of the side beams, and the second cooling channel is located in the cavity, which is conducive to improving the structural integration and has a good use effect. By setting the reinforcing ribs, a reinforcing cavity is formed between the reinforcing ribs and the inner wall of the tank body, which is not only conducive to improving the structural strength of the tank body, but also convenient for processing and forming, and has a good use effect. At the same time, the cross-section of at least one of the reinforcing cavities is triangular, which is conducive to further improving the structural stability.

[0032] An insulation board is arranged between two adjacent rows of battery cells, which is beneficial to reducing the impact of thermal runaway of the battery cells on the adjacent rows of battery cells. The insulation layer is arranged on the inner wall of the first cooling channel and the second cooling channel, which is beneficial to improving the safety of the battery cells; the provision of a protective layer on the bottom surface of the bottom part is beneficial to improving the protective effect of the bottom part; a heating layer is arranged on the bottom surface of the bottom part, and when the battery cells need to be heated, the heating layer can directly heat the cooling medium.

[0033] In addition, another object of the present invention is to provide a battery, wherein the battery is provided with the battery lower shell as described above.

[0034] The battery of the present invention has the same beneficial effects as the above-mentioned battery lower shell, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 It is a schematic structural diagram of the lower housing and the battery cell according to an embodiment of the present invention;

[0037] Figure 2 It is a structural schematic diagram of the lower housing according to an embodiment of the present invention;

[0038] Figure 3 It is a schematic structural diagram of the bottom part and the battery cell according to an embodiment of the present invention;

[0039] Figure 4 It is a structural schematic diagram of the bottom part according to an embodiment of the present invention;

[0040] Figure 5 A schematic diagram of a portion of the structure of the bottom portion according to an embodiment of the present invention;

[0041] Figure 6 is a cross-sectional schematic diagram of a bottom plate according to an embodiment of the present invention;

[0042] Figure 7 It is a schematic structural diagram of a battery cell and a tank body according to an embodiment of the present invention;

[0043] Figure 8 for Figure 7 Left view in;

[0044] Fig. 9 It is a structural schematic diagram of a battery cell according to an embodiment of the present invention;

[0045] Fig.10 This is a schematic diagram of the structure of the bottom plate according to an embodiment of the present invention;

[0046] Fig.11 It is a partial structural schematic diagram of the side beam according to an embodiment of the present invention;

[0047] Fig.12 It is a schematic structural diagram of part of the side beams and the frame according to an embodiment of the present invention.

[0048] Description of reference numerals:

[0049] 1. Frame; 2. Bottom part; 3. Battery cell;

[0050] 100, lower housing; 101, partition beam; 102, electrical component installation space;

[0051] 200, second cooling channel; 201, side beam; 202, bottom plate; 203, heat insulation board; 204, connecting beam; 205, liquid inlet pipe; 206, liquid outlet pipe; 207, connecting pipeline; 208, wiring harness fixing hole; 209, slot body; 210, plug-in port; 211, reinforcing rib; 212, plate body;

[0052] 300. First cooling channel; 301. Card-connecting body. DETAILED DESCRIPTION

[0053] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0054] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0055] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0056] This embodiment relates to a battery pack, the overall structure of which is as follows: Figures 1 to 3 The battery pack includes a lower housing 100 and at least one column of cells 3. The bottom portion 2 of the lower housing 100 is provided with slots 209 arranged corresponding to the columns of cells 3, the top of each slot 209 is provided with an opening, and the bottom of each cell 3 is provided with a connection portion for connecting the cell 3 to the bottom portion 2, and the connection portion is located in the slot 209.

[0057] The bottom of the battery cell 3 can be sealed with an open opening, and a first cooling channel 300 for cooling medium to flow through is formed in each slot 209, and second cooling channels 200 located at both ends of the first cooling channel 300 are provided in the bottom portion 2, and each first cooling channel 300 is respectively connected to the second cooling channel 200 at the same end, and one of the second cooling channels 200 is provided with a liquid inlet, and the other second cooling channel 200 is provided with a liquid outlet.

[0058] The battery pack of this embodiment forms a first cooling channel 300 in the slot body 209 by providing a plurality of slot bodies 209 on the bottom portion 2, wherein the connecting portion is connected to the bottom portion, and the bottom of the battery cell 3 installed on the bottom portion 2 is sealed and open. The bottom portion 2 is provided with two second cooling channels 200 which are simultaneously connected to the plurality of first cooling channels 300, so that the cooling medium flowing in through the liquid inlet flows into each of the first cooling channels 300 after flowing into one of the second cooling channels 200, and cools the battery cell 3, and finally flows out through the liquid outlet after flowing through another second cooling channel 200.

[0059] This method of directly allowing the cooling medium to flow through the bottom of the battery cell 3 is beneficial to improving the cooling effect on the battery cell 3, and directly setting the tank body 209 on the lower shell 100 realizes the integration of the cooling channel and the lower shell 100, eliminating the traditional liquid cooling plate, thereby helping to reduce production costs.

[0060] Based on the above overall introduction, the specific structure of the battery pack in this embodiment is combined with Figure 2 and Figure 4 As shown in . The lower housing 100 includes a frame 1 with a hollow interior, and a partition beam 101 is provided in the frame 1 near one end of the frame 1. The partition beam 101 is used to divide the space in the frame 1 into a larger battery cell installation space and a smaller electrical device installation space 102. The bottom portion 2 is specifically provided at the bottom of the battery cell 3 installation space and serves as an installation carrier for the battery cell 3. Of course, a supporting plate is also provided at the bottom of the electrical device installation space 102 to serve as an installation carrier for the electrical device.

[0061] like Figure 2 and Figure 4 As shown in , the bottom part 2 in this embodiment includes a bottom plate 202, and side beams 201 arranged around the bottom plate 202 and connected to the circumferential frame 101 of the lower shell 100, the slots 209 are all arranged on the bottom plate 202, and the second cooling channel 200 is arranged in the side beams 201. Specifically, the slots 209 on the bottom plate 202 are arranged in multiple rows at intervals along the length direction of the bottom plate 202, and the slots 209 in each row extend along the length direction of the bottom plate 202 and are arranged at intervals in the width direction of the bottom plate 202.

[0062] As described above, the first cooling channel 300 is arranged along the length direction of the bottom plate 202, and the side beams 201 at both ends of the bottom plate 202 are respectively provided with second cooling channels 200, one end of one of the second cooling channels 200 is connected to the liquid inlet pipe 205 via the liquid inlet, and one end of the other second cooling channel 200 is connected to the liquid outlet pipe 206 via the liquid outlet. The cooling medium flowing in from the liquid inlet pipe 205 can flow along the width direction of the bottom plate 202 through the corresponding second cooling channel 200, and flow through each first cooling channel 300 along the length direction of the bottom plate 202 to the second cooling channel 200 at the other end, and finally flow along the width direction of the bottom plate 202 to the liquid outlet pipe 206, which is conducive to improving the flow uniformity of the cooling medium in the bottom plate 202, thereby having a better cooling efficiency.

[0063] As a preferred embodiment, the battery cell 3 is connected to the tank body 209 by a connection portion. Here, the battery cell 3 is connected to the tank body 209 by a connection portion at the bottom, which is conducive to improving the assembly efficiency of the battery cell 3 on the bottom part 2. Figures 7 to 10 As shown in , in this embodiment, the connection portion includes a clamping body 301 disposed at the bottom of the battery cell 3, and a liquid passage is defined between the clamping body 301 and the bottom of the battery cell 3, and the liquid in the first cooling channel 300 flows through the liquid passage. Here, the liquid passage is defined between the clamping body 301 and the battery cell 3, so that the clamping body 301 has a good clamping effect, and the cooling medium directly cools the bottom of the battery cell 3 during the flow of the liquid passage, thereby improving the cooling effect on the battery cell 3. The structure of the bottom plate 202 and the side beam 201 is simple and easy to process and form.

[0064] Specifically, in this embodiment, both sides of the top of the trough body 209 are respectively provided with extension parts extending toward the middle of the trough body 209, and the above-mentioned opening is formed between the two extension parts. Due to the setting of the opening and the width of the trough body 209, the cross section of the trough body 209 is in a "⊥" shape. Here, the structure of the trough body 209 is simple and easy to process and shape. Correspondingly, the cross-sectional shape of the clamping body 301 is adapted to the cross-sectional shape of the trough body 209, so as to have a better clamping effect.

[0065] like Fig. 9 As shown in , the two sides of the top of the clamping body 301 are spaced apart and respectively fixedly connected to the bottom surface of the battery cell 3. After one side of the clamping body 301 is placed at the bottom of one of its extension parts, the other side is placed at the bottom of the extension part on the same side, so that the clamping body 301 is clamped in the slot 209. The two extension parts can limit the clamping body 301 in the height direction, so that the battery cell 3 has a better clamping effect in the slot 209. In the clamped state, the bottom surface of the battery cell 3 abuts against the two extension parts.

[0066] In this embodiment, because the clamping body 301 is located in the slot body 209, and a liquid passage located in the slot body 209 is defined between the clamping body 301 and the bottom surface of the battery cell 3, the cooling medium flowing into the first cooling channel 300 specifically flows out after passing through the liquid passage and cools the bottom of each battery cell 3 passing through, thereby improving the cooling efficiency of the battery cell 3.

[0067] In addition, a sealing structure is provided between the bottom of each battery cell 3 and the bottom part 2, and the sealing structure is used to seal the first cooling channel 300. In specific implementation, the sealing structure can be a sealant provided between the bottom surface of the battery cell 3 and the corresponding extension part, which is not only easy to arrange and implement, but also has a good sealing effect. Here, by providing a sealing structure, it is beneficial to improve the sealing effect between the battery cell 3 and the bottom part 2, thereby preventing the first cooling channel 300 from leaking.

[0068] like Figure 6 As shown in , in this embodiment, the inner wall of the trough body 209 is provided with reinforcing ribs 211 which are arranged on both sides of the opening and extend along the length direction of the trough body 209. A reinforcing cavity is formed between the reinforcing ribs 211 on each side and the inner wall of the trough body 209, and the cross section of at least one of the reinforcing cavities is triangular. Preferably, the reinforcing ribs 211 on each side are in a "<" shape with the opening facing the middle of the trough body 209. By providing the reinforcing ribs 211, it is not only beneficial to improve the structural strength of the trough body 209, but also convenient for processing and forming, and has a good use effect. By forming a reinforcing cavity with a triangular cross section, the effect of the triangle having good stability is utilized, which is beneficial to further improve the structural strength and use stability of the trough body 209.

[0069] At the same time, the two cavities with triangular cross sections defined between the inner wall of the slot body 209 and the reinforcing ribs 211 can also flow through the cooling medium, thereby assisting the first cooling channel 300 to improve the cooling effect. In addition, the setting of the reinforcing ribs 211 can also limit the left and right sides of the clamping body 301, thereby further improving the clamping firmness between the clamping body 301 and the slot body 209.

[0070] As a preferred embodiment, Figures 2 to 4As shown in , the bottom plate 202 in this embodiment includes at least two plate bodies 212 arranged side by side in the side beam 201, and the two adjacent plate bodies 212 are connected via a connecting beam 204. The trough body 209 is provided on each plate body 212, and a connecting channel connecting the first cooling channels 300 on both sides is provided in the connecting beam 204. Among them, two battery cells 3 shown in the figure can be provided on one trough body 209 to improve the installation efficiency. Of course, the number of battery cells 3 connected to one trough body 209 can also be determined according to the use requirements. In this embodiment, the bottom plate 202 is connected by the plate body 212 and the connecting beam 204, which is conducive to adjusting the number of plate bodies 212 according to the use requirements, so as to have good use flexibility, and the connecting channel is conducive to improving the connection between the first cooling channels 300 on both sides, so as to ensure that the cooling medium can flow through all the plate bodies 212, thereby realizing the cooling of each battery cell 3.

[0071] In order to improve the use effect, in this embodiment, Fig.11 As shown in , the four sides of the side beam 201 are connected by multiple sub-beams. The side beams 201 and the connecting beam 204 at both ends are provided with insertion ports 210 on the side facing the plate body 212. The two ends of the plate body 212 are respectively inserted into the insertion ports 210 at the same end, and are respectively welded to the side beam 201 and the connecting beam 204. Here, by providing the insertion ports 210 on the side beam 201 and the connecting beam 204, it is convenient to install the plate body 212. At the same time, the provision of the insertion ports 210 is also convenient to achieve the communication between each first cooling channel 300 and the second cooling channel 200.

[0072] like Figure 2 As shown in , in order to improve the flow effect of the cooling medium, one end of the connecting beam 204 is also provided with a connecting pipe 207 connected to the connecting channel. At this time, the liquid inlet pipe 205 and the liquid outlet pipe 206 connected to the two first cooling channels 300 on the side beam 201 are both used as the liquid outlet pipe 206. The cooling medium flows into the connecting channel through the connecting pipe 207, and can flow to the first cooling channels 300 on both sides at the same time, and flow into the second cooling channel 200 at the same time, and finally flows out through the liquid inlet pipe 205 and the liquid outlet pipe 206. Such a configuration is conducive to reducing the temperature of the cooling medium, thereby improving the cooling efficiency of the battery cell 3. Of course, during the specific implementation, the position of the liquid inlet and outlet can also be determined according to the use requirements.

[0073] Considering that the bottom part 2 is made of aluminum, for example, the bottom plate 202 is formed by extruding an aluminum profile, and can also be manufactured by a rolling process or a sheet metal bending process. To ensure the use effect of the bottom part 2, in this embodiment, the inner walls of the first cooling channel 300 and the second cooling channel 200 are both provided with an insulating layer. By providing the inner walls of the first cooling channel 300 and the second cooling channel 200 with an insulating layer, the safety of the battery cell 3 is improved. Of course, an insulating layer can also be provided on the outer peripheral surface of the card body 301 and in the connecting channel and other locations where insulation is required.

[0074] like Figure 1 As shown in , multiple columns of battery cells 3 are mounted on the bottom portion 2, and a heat insulation board 203 is provided between two adjacent columns of battery cells 3. The heat insulation board 203 is provided between two adjacent columns of battery cells 3, which is beneficial to reduce the impact of thermal runaway of the battery cells 3 on the adjacent columns of battery cells 3. Figure 3 and Figure 4 As shown in , two columns of battery cells 3 are arranged on each plate body 212, and a heat insulation board 203 can be arranged between two columns of battery cells 3 on the same plate body 212. Of course, in order to further improve the use effect, an insulating board can also be arranged between two adjacent columns of battery cells 3. Of course, a heat insulation board 203 can also be arranged on both sides of the insulating board to have both heat insulation and insulation effects.

[0075] In addition, the bottom portion 2 in this embodiment is set as the bottom of the lower shell 100 as a whole, and the bottom of the bottom portion 2 does not need to be provided with a bottom guard plate in the prior art. Preferably, a protective layer is provided on the bottom surface of the bottom portion 2, that is, a protective layer is provided on the bottom surface of the bottom plate 202 to enhance the protective effect of the bottom of the lower shell 100. In specific implementation, the protective layer can be provided on the entire bottom surface of the bottom plate 202, or only on a part of the bottom plate 202 that is prone to damage. The protective layer can be made of foaming materials such as EPP and MPP.

[0076] In order to improve the heating effect of the cooling medium and meet the use requirements of the heating core 3, a heating layer can also be provided at the bottom of the bottom part 2. In specific implementation, the heating layer can be provided on the bottom surface of the bottom plate 202. When the heating layer is activated, the bottom surface of the bottom plate 202 can be heated, thereby heating the cooling medium. The heating layer here can adopt a structure that can realize the heating function in the prior art and is convenient to be arranged at the bottom of the bottom plate 202, such as a heating film, etc., which will not be described in detail here.

[0077] like Fig.12As shown in the figure, a plurality of cavities are formed in the side beams 201 at both ends, and the second cooling channel 200 is located in the cavity arranged near the first cooling channel 300. Preferably, the plurality of cavities are arranged in the height and width directions. The above-mentioned second cooling channel 200 is specifically located in the cavity arranged near the end of the first cooling channel 300. The provision of a plurality of cavities here is beneficial to improving the structural strength of the side beam 201. Furthermore, a plurality of wiring harness fixing holes 208 are provided at the top of the side beam 201. Here, the wiring harness fixing holes 208 at the top of the side beam 201 are beneficial to fixing the wiring harness inside the battery.

[0078] It should be noted that the cooling medium in this embodiment can be any medium that can achieve cooling needs, such as gas, liquid, etc. The battery cell 3 in this embodiment can be a square battery cell 3, and can also be applied to long blade or short blade battery cells 3.

[0079] The battery pack of this embodiment is connected to the bottom part 2 through the battery cell 3, and a first cooling channel 300 is defined between the battery cell 3 and the tank 209, which can achieve close contact and effective heat conduction between the battery cell 3 and the bottom part 2, thereby improving the cooling effect. The heat on the battery cell 3 can be transferred to the lower shell 100 more directly and efficiently without passing through the thermal conductive glue in the prior art. Therefore, the battery lower shell can better control the battery temperature during high-power discharge and prevent overheating.

[0080] The battery pack in this embodiment also effectively manages the heat of the battery cell 3 through the lower shell in this embodiment, which can reduce the operating temperature of the battery and reduce the impact of thermal stress on the battery. Obviously, excessive temperature of the battery cell 3 will lead to problems such as accelerated battery capacity decay and increased internal resistance, while optimized thermal management can extend the battery life and improve its performance.

[0081] Compared with the traditional cooling solution, the battery pack in this embodiment does not need to use additional accessories and pipelines. By introducing a cavity at the bottom of the battery cell 3 and combining it with the lower shell 100, the design and manufacture of the cooling structure can be simplified, and the number of components and installation difficulty can be reduced. This helps to reduce the complexity and cost of the cooling structure and improve production efficiency.

[0082] Furthermore, the first cooling channel 300 at the bottom of the battery cell 3 in this embodiment can achieve a more uniform thermal balance, effectively eliminating the hot spot area and local overheating of the battery cell 3. This ensures that the heat distribution of the entire battery cell 3 is more uniform, and prevents the problem of imbalance caused by excessive temperature differences in different areas.

[0083] Secondly, the battery pack of this embodiment can increase the stability and strength of the entire bottom part 2 structure, improve durability and safety, through the welding and fixing of the bottom plate 202 and the side beam 201. The battery pack simplifies the integration of the battery cell 3 and the cooling system, reduces the cost and complexity, improves the thermal management effect of the battery, prolongs the battery life, and increases the safety performance of the battery.

[0084] In addition, this embodiment also relates to an electrical device, on which the battery pack as described above is provided.

[0085] The electrical device has the same beneficial effects as the above-mentioned battery pack, which will not be described in detail here.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: It includes a lower housing and at least one row of battery cells; The bottom portion of the lower housing is provided with slots arranged corresponding to the cells in each column, the top of each slot is provided with an opening, the bottom of each cell is provided with a connecting portion for connecting the cell to the bottom portion, and the connecting portion is located in the slot; The bottom of the battery cell can block the opening, and a first cooling channel for cooling medium to flow through is formed in each of the tanks, and second cooling channels located at both ends of the first cooling channel are provided in the bottom portion, and each of the first cooling channels is respectively connected to the second cooling channel at the same end, and a liquid inlet is provided on one of the second cooling channels, and a liquid outlet is provided on the other second cooling channel; The battery cell is connected to the tank body by the connecting portion, the connecting portion includes a connecting body provided at the bottom of the battery cell, a liquid passage is defined between the connecting body and the bottom of the battery cell, and the liquid in the first cooling channel flows through the liquid passage; The bottom part includes a bottom plate and side beams arranged around the bottom plate and connected to the circumferential frame of the lower shell. The trough bodies are all arranged on the bottom plate, and the second cooling channel is arranged in the side beams.

2. The battery pack according to claim 1, characterized in that: A sealing structure is provided between the bottom of each battery cell and the bottom portion, and the sealing structure is used to seal the first cooling channel.

3. The battery pack according to claim 1, characterized in that: The bottom plate includes at least two plate bodies arranged side by side in the side beam, and two adjacent plate bodies are connected via a connecting beam; The trough body is arranged on each of the plate bodies, and a connecting channel connecting the first cooling channels on both sides is arranged in the connecting beam.

4. The battery pack according to claim 3, characterized in that: The side beam and the connecting beam are both provided with insertion openings on the side facing the plate body, and the two ends of the plate body are respectively inserted into the insertion openings at the same end and are respectively welded to the side beam and the connecting beam; and / or, A plurality of cavities are arranged in the side beams at both ends, and the second cooling channel is located in the cavity arranged close to the first cooling channel.

5. The battery pack according to claim 1, characterized in that: The inner wall of the trough body is provided with reinforcing ribs which are arranged on both sides of the opening and extend along the length direction of the trough body; A reinforcement cavity is formed between the reinforcement ribs on each side and the inner wall of the trough body, and the cross section of at least one of the reinforcement cavities is triangular.

6. The battery pack according to claim 1, characterized in that: A plurality of rows of battery cells are mounted on the bottom portion, and a heat insulation plate is provided between two adjacent rows of battery cells.

7. The battery pack according to any one of claims 1 to 6, characterized in that: The inner walls of the first cooling channel and the second cooling channel are both provided with an insulating layer; and / or, The bottom surface of the bottom part is provided with a protective layer and / or a heating layer.

8. An electrical device, characterized in that: The electrical device is provided with a battery pack according to any one of claims 1 to 7.

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