Cell connection structure, battery pack and vehicle

Abstract

This disclosure relates to a cell connection structure, a battery pack, and a vehicle for electrically connecting multiple battery cells. The cell connection structure includes: a cooler disposed at one end of a cell terminal, comprising a cavity and corresponding mounting holes for each cell terminal; an electrical connector for connecting the cell terminals, wherein a portion of the electrical connector passes through the cavity, and a portion is exposed at the mounting holes for electrical connection with the cell terminals, and the electrical connector is circumferentially sealed to the mounting holes; and an insulating heat dissipation medium disposed in the cavity for cooling the electrical connectors passing through the cavity. This cell connection structure highly integrates the electrical connectors and the cooler, increasing the heat dissipation capacity of both the electrical connectors and the cells, significantly reducing the risk of thermal runaway in the battery pack, and improving the space utilization of the battery pack.

Description

Technical Field

[0001] This disclosure relates to the field of new energy power battery technology, specifically to a cell connection structure, a battery pack, and a vehicle. Background Technology

[0002] In the power batteries of new energy vehicles, high-voltage connections between cells are mainly achieved by welding aluminum busbars. The current-carrying area of ​​the aluminum busbar (the cross-sectional area perpendicular to the current direction as the current flows through the aluminum busbar) is adjusted according to the charging and discharging current of the battery pack. When the current is large, the current-carrying area of ​​the aluminum busbar needs to be increased, that is, the size of the aluminum busbar needs to be increased, to prevent the current-carrying area from being too small, which would generate a lot of heat during charging and discharging and affect the safety performance of the cells.

[0003] As the requirements for the performance of power batteries, such as fast charging and output power, become increasingly stringent, the current of battery packs is also increasing, placing higher demands on the current-carrying area and heat dissipation capacity of the high-voltage connecting aluminum busbars. However, due to space constraints, the current-carrying area of ​​the aluminum busbars cannot be increased indefinitely. Under high-current conditions, the aluminum busbars release a large amount of heat, affecting the safety performance of the battery cells. Summary of the Invention

[0004] The purpose of this disclosure is to provide a cell connection structure, a battery pack, and a vehicle. This cell connection structure highly integrates electrical connectors and a cooler, which can increase the heat dissipation capacity of the electrical connectors and cells, greatly reduce the risk of thermal runaway of the battery pack, and improve the space utilization of the battery pack.

[0005] To achieve the above objectives, in a first aspect, this disclosure provides a cell connection structure for electrically connecting multiple cells, the cell connection structure comprising:

[0006] A cooler is located at one end of the battery cell terminal and includes a cavity and configuration holes corresponding to the battery cell terminals.

[0007] An electrical connector for connecting the battery cell terminals, wherein a portion of the connector passes through the cavity, and a portion is exposed at the mounting hole for electrical connection with the battery cell terminals, and the connector is circumferentially sealed to the mounting hole; and

[0008] An insulating and heat-dissipating medium is disposed in the cavity to cool the electrical connectors that pass through the cavity.

[0009] Optionally, the cooler further includes an inlet and an outlet communicating with the cavity, wherein the inlet is used to introduce an insulating heat dissipation medium into the cavity, and the outlet is used to discharge the insulating heat dissipation medium.

[0010] Optionally, the liquid inlet is located on one side of the cooler, and the liquid outlet is located on the other end of the cooler opposite to the liquid inlet.

[0011] Optionally, the cooler includes an upper plate and a lower plate connected to each other. The upper plate has a plurality of first through holes corresponding to the battery cell terminals. The lower plate has a plurality of second through holes corresponding to the battery cell terminals. Among the plurality of first through holes and second through holes, the corresponding first through holes and second through holes form the configuration holes.

[0012] Optionally, the electrical connector is configured as a cooling section and a connecting section; the cooling section passes through the cavity, the connecting section is exposed to the configuration hole, and the connecting section has an observation hole.

[0013] Optionally, the cell connection structure further includes a first output connector and a second output connector;

[0014] One end of the first output connector extends into the interior of the cooler and is connected to either the positive or negative terminal of the battery cell terminal; one end of the second output connector extends into the interior of the cooler and is connected to either the positive or negative terminal of the battery cell terminal.

[0015] Optionally, the cooler is made of insulating material;

[0016] And / or, the electrical connector is made of aluminum busbar.

[0017] A second aspect of this disclosure also provides a battery pack comprising a plurality of battery cells and the aforementioned cell connection structure.

[0018] Optionally, the multiple battery cells are arranged in multiple columns, each column forming a battery cell group, each battery cell group corresponding to a battery cell connection structure, and adjacent battery cell connection structures are connected by a bridging aluminum busbar.

[0019] In a third aspect, this disclosure also provides a vehicle that includes the aforementioned battery pack.

[0020] Through the above technical solution, namely the cell connection structure disclosed herein, the electrical connector is used for the electrical connection of cell terminals between multiple cells. A portion of the electrical connector is inserted into the cavity of the cooler and immersed in an insulating heat dissipation medium, while a portion is exposed at the configuration hole for electrical connection with the cell terminals. During charging and discharging, the heat generated by the cells and electrical connector can be absorbed by the insulating heat dissipation medium, increasing the heat dissipation area and improving the heat dissipation capacity, thus avoiding thermal runaway caused by excessive temperature. At the same time, the high integration of the electrical connector and the cooler can improve the space utilization of the battery pack.

[0021] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 This is a structural diagram of the cell connection structure provided in some embodiments of this disclosure;

[0024] Figure 2 This is a structural diagram of a cell connection structure provided in some embodiments of this disclosure, wherein the upper plate is hidden;

[0025] Figure 3 This is a top view of the cell connection structure provided in some embodiments of this disclosure;

[0026] Figure 4 Based on Figure 3 AA cross-section diagram;

[0027] Figure 5 yes Figure 4 A magnified view of a portion of the image;

[0028] Figure 6 Based on Figure 3 BB cross-section diagram;

[0029] Figure 7 Based on Figure 3 CC cross-section diagram in the middle;

[0030] Figure 8 This is a structural diagram of the cell connection structure provided in some other embodiments of this disclosure;

[0031] Figure 9 This is a structural diagram of a cell connection structure provided in some other embodiments of this disclosure, wherein the upper plate is hidden;

[0032] Figure 10 This is a top view of the cell connection structure provided in some other embodiments of this disclosure;

[0033] Figure 11 Based on Figure 10 DD cross-sectional view;

[0034] Figure 12 This is a schematic diagram of the cell-to-cell connection structure of a battery pack provided in some embodiments of this disclosure;

[0035] Figure 13 This is a schematic diagram of the cell-to-cell connection structure of a battery pack provided in other embodiments of this disclosure.

[0036] Explanation of reference numerals in the attached figures

[0037] 10 - Cell connection structure; 20 - Cell; 30 - Aluminum busbar for bridging; 40 - Connecting conduit;

[0038] 100-Cooler; 101-Cavity; 102-Configuration hole; 110-Upper plate; 111-First through hole; 120-Lower plate; 121-Second through hole; 200-Electrical connector; 210-Cooling part; 220-Connection part; 221-Observation hole; 310-First output connector; 320-Second output connector; 410-Liquid inlet; 420-Liquid outlet. Detailed Implementation

[0039] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0040] In this disclosure, unless otherwise stated, directional terms such as "inner" and "outer" refer to the inner and outer contours of the corresponding components; "far" and "near" refer to the corresponding structure or component being away from or near another structure or component. Furthermore, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance implications. Additionally, in the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements. The above definitions are for explanation and illustration only and should not be construed as limiting this disclosure.

[0041] With increasingly stringent requirements for the performance of power batteries, such as fast charging and output power, the charging and discharging currents of battery packs are becoming larger. To ensure the safety of the battery pack under high current conditions, it is necessary to simultaneously increase the current-carrying area of ​​the aluminum busbar and improve its heat dissipation capacity to prevent the aluminum busbar from overheating and causing thermal runaway. However, as the requirements for battery pack space utilization and integration become more stringent, the size of the aluminum busbar cannot be increased indefinitely, meaning the current-carrying area of ​​the aluminum busbar is limited. Under high current conditions, it will release a large amount of heat, affecting the safety performance of the battery cells. Therefore, how to improve the heat dissipation capacity of the aluminum busbar and ensure the safety of the battery cells while ensuring battery pack space utilization, integration, and assembly efficiency has become an urgent technical challenge.

[0042] like Figures 1 to 13As shown, in order to achieve the above objectives, the first aspect of this disclosure provides a battery cell connection structure 10 for electrical connection of multiple battery cells 20. The battery cell connection structure 10 includes: a cooler 100 disposed at one end of the battery cell terminal of the battery cell 20, including a cavity 101 and a configuration hole 102 corresponding to the battery cell terminal; an electrical connector 200 for connection between the battery cell terminals, a portion of the electrical connector 200 passing through the cavity 101, and another portion exposed at the configuration hole 102 for electrical connection with the battery cell terminal, and the electrical connector 200 is circumferentially sealed to the configuration hole 102; and an insulating heat dissipation medium disposed in the cavity 101 for cooling the electrical connector 200 passing through the cavity 101.

[0043] Through the above technical solution, namely the cell connection structure 10 disclosed herein, the electrical connector 200 is used for the electrical connection of the cell terminals between multiple cells 20. A portion of the electrical connector 200 is inserted into the cavity 101 of the cooler 100 and immersed in the insulating heat dissipation medium, while a portion is exposed at the configuration hole 102 for electrical connection with the cell terminals. During charging and discharging, the heat generated by the cells 20 and the electrical connector 200 can be absorbed by the insulating heat dissipation medium, increasing the heat dissipation area and improving the heat dissipation capacity, thus avoiding thermal runaway caused by excessive temperature. At the same time, the high integration of the electrical connector 200 with the cooler 100 can improve the space utilization of the battery pack.

[0044] It is understood that in some embodiments, multiple cells 20 in the battery pack can be arranged adjacent to each other in a row. Each cell 20 includes two cell terminals, one of which is a positive terminal and the other is a negative terminal. The configuration holes 102 on the cooler 100 in the cell connection structure 10 correspond one-to-one with the multiple cell terminals of the multiple cells 20 arranged in the above manner. That is, the configuration holes 102 on the cooler 100 are in two rows, and the multiple configuration holes 102 on each row are spaced apart. The spacing corresponds to the width of the cell 20. The configuration holes 102 on the two rows correspond one-to-one in the extension direction of the line connecting the two cell terminals of the cell 20, and the spacing between the two configuration holes 102 corresponds to the distance between the two cell terminals on the same cell 20. The electrical connector 200 can connect multiple battery cells 20 in series in any suitable manner. That is, the positive terminal of the battery cell 20 can be connected to the negative terminal of the battery cell 20 through one electrical connector 200, and the negative terminal of the battery cell 20 can be connected to the positive terminal of the battery cell 20 through one electrical connector 200, and so on, thereby connecting multiple battery cells 20 in series. At the outermost battery cell 20, the positive and negative terminals are introduced by the electrical connector 200 for connection with other external modules, such as a charging module or a motor.

[0045] In some embodiments, the electrical connector 200 may be made of aluminum busbar. Alternatively, the electrical connector 200 may also be made of a material with low resistance and good conductivity, such as copper busbar, as long as it can achieve electrical connection between the battery cells 20. This disclosure does not make specific limitations here.

[0046] There can be multiple electrical connectors 200, and the electrical connectors 200 can be arranged in any suitable manner inside the cooler 100. The size, number and structure of the electrical connectors 200 (e.g., aluminum busbars) need to be determined according to the battery pack performance requirements, cell 20 parameters and cell 20 arrangement.

[0047] It should be noted that the insulating and heat-dissipating medium is selected from media with good insulation and heat dissipation performance and high specific heat capacity, such as fluorinated liquid, so that it can insulate against the electrical connector 200 (e.g., aluminum busbar) while ensuring good heat absorption and dissipation capabilities. The part of the electrical connector 200 that needs to be welded to the battery cell terminal is exposed at the configuration hole 102, while the rest is completely located inside the cavity 101 and immersed in the insulating and heat-dissipating medium. Thus, the heat generated during charging and discharging can be absorbed by the insulating and heat-dissipating medium, thereby cooling the electrical connector 200.

[0048] To further improve heat dissipation capacity, such as Figure 8 , Figure 9 and Figure 10 As shown, in some embodiments, the cooler 100 further includes an inlet 410 and an outlet 420 communicating with the cavity 101. The inlet 410 is used to introduce an insulating heat dissipation medium into the cavity 101, and the outlet 420 is used to discharge the insulating heat dissipation medium. The insulating heat dissipation medium can enter the cavity 101 of the cooler 100 through the inlet 410 and flow through all the portions of the electrical connectors 200 located within the cavity 101, carrying away the heat generated by the electrical connectors 200, and then flow out through the outlet 420, thereby cooling the electrical connectors 200 and the battery cell 20. Because the insulating heat dissipation medium is in a flowing state within the cavity 101, it can better remove the heat generated by the electrical connector 200. Alternatively, the inlet 410 and outlet 420 can be connected to a heat exchanger, whereby the heat dissipation medium discharged from the outlet 420 exchanges heat with other cooling media, thereby removing the heat from the insulating heat dissipation medium. The heat is then introduced into the cavity 101 through the inlet 410, improving the heat dissipation capacity of the insulating heat dissipation medium.

[0049] It should be noted that the insulation in the insulating heat dissipation medium refers to the conductive insulation between the insulating medium and the electrical connector 200, and the heat dissipation refers to the ability to carry away the heat generated by the electrical connector 200 and transfer it to the outside.

[0050] The liquid inlet 410 and liquid outlet 420 can be constructed in any suitable manner, and their positions on the cooler 100 can also be arbitrarily arranged. To better allow the insulating heat dissipation medium entering the cavity 101 to flow through each electrical connection 200, such as... Figure 10 As shown, in some embodiments, the liquid inlet 410 is located on one side of the cooler 100, and the liquid outlet 420 is located on the other end of the cooler 100 opposite to the liquid inlet 410. That is, the liquid inlet 410 and the liquid outlet 420 are respectively located on opposite sides of the cooler 100, so that the liquid enters one end of the cavity 101 through the liquid inlet 410, flows into the cavity 101 to the opposite end, and then flows out through the liquid outlet 420 located at that end, thereby achieving cooling of the electrical connector 200 and the battery cell 20.

[0051] The cooler 100 can be constructed in any suitable manner. In some embodiments, the cooler 100 includes an upper plate 110 and a lower plate 120 connected to each other. The upper plate 110 has a plurality of first through holes 111 corresponding to the battery cell terminals. The lower plate 120 has a plurality of second through holes 121 corresponding to the battery cell terminals. Among the plurality of first through holes 111 and second through holes 121, the corresponding first through holes 111 and second through holes 121 form a configuration hole 102. The lower plate 120 and the upper plate 110 can be made of plastic parts, PET film, PI film, or other materials with good insulation properties and easy molding. The upper plate 110 and the lower plate 120 together form a cavity 101. The upper plate 110 has a plurality of first through holes 111 and the lower plate 120 has a plurality of second through holes 121 that correspond one-to-one, and the corresponding first through holes 111 and second through holes 121 form a configuration hole 102. A portion of the electrical connector 200 forms a seal in the circumferential direction of the configuration hole 102 at the configuration hole 102 to prevent the insulating heat dissipation medium in the cavity 101 from leaking out through the configuration hole 102.

[0052] In some embodiments, the upper plate 110 and the lower plate 120, as well as the electrical connector 200, can be assembled by integral injection molding or hot pressing, or by other methods such as adhesive bonding. It is sufficient to ensure the sealing performance between the connection between the upper plate 110 and the lower plate 120 of the cooler 100, between the upper plate 110 and the electrical connector 200, and between the lower plate 120 and the electrical connector 200.

[0053] To facilitate electrical connection with the battery cell terminals of the battery cell 20, in some embodiments, the electrical connector 200 is constructed as a cooling section 210 and a connecting section 220. The cooling section 210 passes through the cavity 101, and the connecting section 220 is exposed in the configuration hole 102. The connecting section 220 has an observation hole 221 for welding with the battery cell terminals. The connecting section 220 is the area of ​​the electrical connector 200 exposed at the configuration hole 102, where the observation hole 221 can be provided. The position and size of the observation hole 221 can be set according to the size of the battery cell terminals. That is, the battery cell terminals are in surface contact with the connecting section 220 at the configuration hole 102 and are welded together. The battery cell terminals can be aligned through the observation hole 221 so that they can be fixedly connected by welding.

[0054] It should be noted that the observation hole 221 can be constructed using any suitable structure. In some embodiments, the observation hole 221 may include a first hole segment and a second hole segment that are interconnected, and the diameter of the first hole segment is larger than the diameter of the second hole segment. The second hole segment is closer to the battery cell 20. The smaller hole in the second hole segment is for easy observation when the connection portion 220 is welded to the battery cell electrode. For alignment during welding, the larger diameter of the first hole segment forms a large countersunk platform on its upper surface. This is for welding considerations; due to equipment limitations, it is not possible to weld excessively thick busbars, so a countersunk platform is formed at the connection portion 220 to reduce thickness and facilitate welding.

[0055] To achieve high-voltage electrical connection with other modules, in some embodiments, the cell connection structure 10 further includes a first output connector 310 and a second output connector 320. One end of the first output connector 310 extends into the interior of the cooler 100 and is connected to either the positive or negative terminal of the cell electrode. One end of the second output connector 320 extends into the interior of the cooler 100 and is connected to either the positive or negative terminal of the cell electrode. The first output connector 310 and the second output connector include, but are not limited to, aluminum busbars.

[0056] The first output connector 310 extends through the cavity 101 to the outermost configuration hole 102 and connects to the positive terminal of the outermost battery cell 20. The portion of the connector inside the cavity 101 is immersed in an insulating heat dissipation medium, and the portion outside the cooler 100 can form a terminal to achieve high-voltage connection with other modules. The second output connector 320 extends through the cavity 101 to the outermost configuration hole 102 and connects to the negative terminal of the outermost battery cell 20. The portion of the connector inside the cavity 101 is immersed in an insulating heat dissipation medium, and the portion outside the cooler 100 can form another terminal to achieve high-voltage connection with other modules.

[0057] The upper plate 110, lower plate 120, and electrical connector 200 of the cooler 100 form a closed cavity 101, which is filled with an insulating heat-dissipating medium. The portion of the electrical connector 200 (e.g., an aluminum busbar) that needs to be welded to the battery cell terminal is exposed at the mounting hole 102; the rest is located within the cavity 101 and immersed in the insulating heat-dissipating medium. The insulating heat-dissipating medium within the closed cavity 101 absorbs heat from the electrical connector 200 and diffuses it outwards to achieve heat dissipation. The first output connector 310 and the second output connector 320 are used to connect to other external modules to enable charging and / or discharging of the battery cell 20.

[0058] Compared to current battery packs where the high-voltage connecting aluminum busbars between cells 20 lack cooling or heat dissipation systems, where the current-carrying area of ​​the high-voltage connecting aluminum busbars is typically adjusted based on the battery pack's charging and discharging current (i.e., adjusting the busbar size), the current-carrying area and heat dissipation capacity of the high-voltage connecting aluminum busbars are increasingly demanding due to rising requirements for fast charging and output power performance. However, space constraints prevent the current-carrying area of ​​the aluminum busbars from being increased indefinitely. This disclosed technical solution adds a cooler 100 to the high-voltage connecting aluminum busbars, highly integrating the aluminum busbars and the cooler 100. This not only increases the heat dissipation capacity of both the aluminum busbars and cells 20, significantly reducing the risk of thermal runaway in the battery pack, but also improves the space utilization of the battery pack, ensuring high integration and assembly efficiency.

[0059] A second aspect of this disclosure also provides a battery pack, which may include a plurality of battery cells 20 and the aforementioned battery cell connection structure 10. The battery cell connection structure 10 is used to connect the battery cell terminals of the plurality of battery cells 20, which can realize high-voltage connection between the battery cells 20 and improve heat dissipation capacity. Even under high current conditions, it can remove most of the heat and avoid thermal runaway caused by excessive temperature. At the same time, it also facilitates the device and ensures high integration and assembly efficiency of the battery pack.

[0060] After the battery cells 20 are stacked, the electrical connectors 200 are welded to the battery cell terminals to achieve high-voltage connection between the battery cells 20. The number, length, height, etc. of the electrical connectors 200 and the cooler 100 can be adjusted according to the battery pack space and the arrangement of the battery cells 20. High-voltage connection between adjacent high-voltage connections and heat dissipation systems is achieved through the bridging aluminum busbars 30.

[0061] In some embodiments, multiple battery cells 20 are arranged in multiple columns, each column forming a battery cell group. Each battery cell group may also include multiple battery cells 20 arranged side by side. Each battery cell group corresponds to a battery cell connection structure 10, and adjacent battery cell connection structures 10 are connected by a bridging aluminum busbar 30. This enables electrical connection between battery cells 20 and also allows for heat dissipation of battery cells 20 using multiple battery cell connection structures 10.

[0062] It should be noted that in some embodiments, when each cooler 100 includes an inlet 410 and an outlet 420, the inlet 410 and / or outlet 420 can be connected in series via a connecting pipe 40, so that the insulating heat dissipation medium is introduced through one inlet 410 and flows out through the other inlet 410 or outlet 420, thus satisfying the flow of the insulating heat dissipation medium. For example, when there are two cell connection structures 10, the outlet 420 at the same end can be connected to the inlet 410, or the two inlets 410 can be connected via a connecting pipe 40, and the inlet 410 and outlet 420 at the other end, or the two outlets 420 can be connected to the insulating heat dissipation medium circulation system respectively, so as to realize the flow of the insulating heat dissipation medium.

[0063] Of course, insulating heat dissipation medium is also introduced and discharged into each cooler 100, which can also enable its flow in the cavity 101.

[0064] In a third aspect, this disclosure also provides a vehicle that includes the aforementioned battery pack, and thus the vehicle also possesses all the advantages of the aforementioned battery pack, which will not be repeated here.

[0065] The disclosed cell connection structure 10, battery pack, and vehicle include an electrical connector 200 for electrical connection of cell terminals between multiple cells 20. A portion of the electrical connector 200 is inserted into the cavity 101 of the cooler 100 and immersed in a heat dissipation medium, while a portion is exposed at the configuration hole 102 for electrical connection with the cell terminals. During charging and discharging, the heat generated by the cells 20 and the electrical connector 200 can be absorbed by the heat dissipation medium, increasing the heat dissipation area and improving the heat dissipation capacity, thus preventing thermal runaway caused by excessive temperature. At the same time, the high integration of the electrical connector 200 with the cooler 100 can improve the space utilization of the battery pack. In the above technical solution, a cooler 100 is added to the electrical connector 200 (e.g., aluminum busbar). For high-current operating conditions, the size of the electrical connector 200 does not need to be increased, ensuring the battery pack's heat dissipation capacity and safety, while also reducing the battery pack's weight and cost. Furthermore, the electrical connector 200 and cooler 100 are highly integrated, greatly improving the battery pack's space utilization and integration. After integration, the electrical connector 200 and cooler 100 can be directly welded to the cell terminals at the configuration holes 102, improving the battery pack's assembly efficiency.

[0066] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0067] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0068] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A cell connection structure for electrically connecting multiple cells (20), characterized in that, The cell connection structure (10) includes: A cooler (100) is provided at one end of the battery cell (20) electrode post, including a cavity (101) and a configuration hole (102) corresponding to the battery cell electrode post; An electrical connector (200) is provided for connecting the battery cell terminals. A portion of the electrical connector (200) extends through the cavity (101), and a portion is exposed at the configuration hole (102) for electrical connection with the battery cell terminals. The electrical connector (200) is circumferentially sealed to the configuration hole (102). An insulating and heat-dissipating medium is provided in the cavity (101) for cooling the electrical connector (200) that passes through the cavity (101).

2. The cell connection structure according to claim 1, characterized in that, The cooler (100) further includes an inlet (410) and an outlet (420) communicating with the cavity (101). The inlet (410) is used to introduce an insulating heat dissipation medium into the cavity (101), and the outlet (420) is used to discharge the insulating heat dissipation medium.

3. The cell connection structure according to claim 2, characterized in that, The liquid inlet (410) is located on one side of the cooler (100), and the liquid outlet (420) is located on the other end of the cooler (100) opposite to the liquid inlet (410).

4. The cell connection structure according to claim 1, characterized in that, The cooler (100) includes an upper plate (110) and a lower plate (120) connected to each other. The upper plate (110) is provided with a plurality of first through holes (111) corresponding to the battery cell terminals. The lower plate (120) is provided with a plurality of second through holes (121) corresponding to the battery cell terminals. Among the plurality of first through holes (111) and second through holes (121), the corresponding first through holes (111) and second through holes (121) form the configuration hole (102).

5. The cell connection structure according to claim 1, characterized in that, The electrical connector (200) is configured as a cooling part (210) and a connecting part (220); the cooling part (210) passes through the cavity (101), the connecting part (220) is exposed to the configuration hole (102), and the connecting part (220) has an observation hole (221).

6. The cell connection structure according to claim 1, characterized in that, The cell connection structure (10) further includes a first output connector (310) and a second output connector (320); One end of the first output connector (310) extends into the interior of the cooler (100) and is connected to one of the positive or negative terminals of the battery cell terminal, and one end of the second output connector (320) extends into the interior of the cooler (100) and is connected to the other of the positive or negative terminals of the battery cell terminal.

7. The cell connection structure according to any one of claims 1-6, characterized in that, The cooler (100) is made of insulating material; And / or, the electrical connector (200) is made of aluminum busbar.

8. A battery pack, characterized in that, The battery pack includes a plurality of cells (20) and a cell connection structure (10) as described in any one of claims 1-7.

9. The battery pack according to claim 8, characterized in that, Multiple battery cells (20) are arranged in multiple columns, each column forming a battery cell group. Each battery cell group corresponds to a battery cell connection structure (10), and adjacent battery cell connection structures (10) are connected by a bridging aluminum busbar (30).

10. A vehicle, characterized in that, The vehicle includes the battery pack as described in claim 8 or 9.

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