Battery pack and electric equipment

Abstract

The utility model relates to a battery pack and electric equipment. The battery pack comprises a battery cell and a battery pack, the connecting component is electrically connected with the battery cell; the shell is used for accommodating the battery cell, and the battery cell is arranged in the shell; a filling area is formed between the side wall of the shell and the battery cell, the connecting component is located in the filling area, and the filling area is filled with insulating cooling liquid for cooling the battery cell and the connecting component. The battery pack can be effectively cooled, and local high-temperature hot spots are avoided, so that the safety risk is reduced, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of battery equipment, and in particular to a battery pack and electrical equipment. Background Art

[0002] At present, electric vehicles and energy storage systems are mostly powered by battery packs. The battery modules in the battery packs generally include multiple battery cells, which generate a lot of heat during the charging and discharging process.

[0003] In the related art, cold plates are often installed around the battery modules of the battery pack to transfer heat for heat dissipation. However, this method only dissipates heat for the entire battery module, and the part where adjacent cells are connected is generally not equipped with an additional heat dissipation structure. The generated heat can only be dissipated by heat conduction to the cell body, which is easy to generate local hot spots at the location where adjacent cells are connected, increasing the risk of high temperature in the battery pack. Utility Model Content

[0004] The present application is proposed to solve the above-mentioned problems. According to one aspect of the present application, a battery pack is provided, comprising: a battery cell; a connecting member, wherein the connecting member is electrically connected to the battery cell; a shell, wherein the shell is used to accommodate the battery cell, and the battery cell is arranged inside the shell; a filling area is formed between the side wall of the shell and the battery cell, the connecting member is located in the filling area, and the filling area is filled with an insulating coolant for cooling the battery cell and the connecting member.

[0005] Exemplarily, the connecting member includes a pole, the battery pack also includes a connector connected to the pole, the battery pack includes a plurality of battery cells, and the positive pole of each battery cell is electrically connected to the negative pole of an adjacent battery cell through the connector.

[0006] Exemplarily, the insulating coolant completely immerses the pole and the connecting piece.

[0007] Exemplarily, the insulating coolant completely fills the filling area.

[0008] Exemplarily, at least a portion of the connector and the pole are exposed above the liquid level of the insulating coolant.

[0009] Exemplarily, the battery pack further includes a convection device, and the convection device is disposed on the shell.

[0010] Exemplarily, the convection device includes a driving member, which is located below the liquid level of the insulating coolant to accelerate the flow of the insulating coolant during operation.

[0011] Exemplarily, the driving member includes a water pump and / or a fan blade.

[0012] Exemplarily, a circulation device is also included, which is used to drive the insulating coolant to circulate between the circulation device and the filling area, and to enable the pole and / or the connector to exchange heat with the insulating coolant.

[0013] Exemplarily, the circulation device includes a circulation pipe arranged on the shell, and the circulation pipe is connected to the filling area; the shell is provided with a coolant recovery hole and a coolant dripping hole connected to the filling area, and both ends of the circulation pipe are respectively connected to the coolant recovery hole and the coolant dripping hole, wherein the coolant dripping hole is arranged toward the connecting piece or the pole, so that the connecting piece and / or the pole can exchange heat with the insulating coolant.

[0014] Exemplarily, the circulation pipeline is connected to a circulation pump, and the circulation pump is used to drive the insulating coolant to circulate between the circulation pipeline and the filling area.

[0015] Exemplarily, the connecting member includes a tab, which is disposed on the battery cell, and the tabs of adjacent battery cells are electrically connected.

[0016] Exemplarily, a cold plate is also included, and the cold plate is thermally connected to the battery cell.

[0017] Exemplarily, the housing comprises a tray, and the filling area is located between the tray and the battery cell.

[0018] According to another aspect of the present application, an electric device is also provided, and the electric device includes the above-mentioned battery pack.

[0019] The battery pack in the present application has a filling area formed between the side wall of the shell and the battery cell, and an insulating coolant is filled in the filling area. When the connecting components of the battery cell generate heat, the generated heat can be absorbed by the insulating coolant, thereby avoiding local high temperature in the battery pack, which can effectively reduce safety risks and increase the service life of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0021] Figure 1A schematic diagram of the structure of the battery pack in the first embodiment of the present application is shown.

[0022] Figure 2 A schematic diagram of the structure of the battery pack in the second embodiment of the present application is shown.

[0023] Figure 3 A schematic diagram of the structure of the battery pack in the third embodiment of the present application is shown.

[0024] Figure 4 A schematic diagram of the structure of the circulation device in Example 3 of the present application is shown.

[0025] Figure numerals: 1, battery cell; 11, pole; 2, shell; 21, cold plate; 3, tray; 4, filling area; 5, insulating coolant; 6, connector; 7, circulation device; 71, circulation pipeline; 72, circulation pump; 73, coolant dripping hole; 74, coolant recovery hole. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present application more obvious, the example embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments of the present application described in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0027] Embodiment 1

[0028] like Figure 1 As shown, an embodiment of the present application provides a battery pack, which includes: a battery cell 1; a connecting member, which is electrically connected to the battery cell 1; a shell 2, which is used to accommodate the battery cell 1, and the battery cell 1 is arranged inside the shell 2; a filling area 4 is formed between the side wall of the shell 2 and the battery cell 1, the connecting member is located in the filling area 4, and the filling area 4 is filled with an insulating coolant 5 for cooling the battery cell and the connecting member.

[0029] Exemplarily, the shell 2 also includes a plurality of cold plates 21 arranged around the battery cell 1 and a tray 3 connected to the cold plate 21, wherein the filling area is located between the tray 3 and the battery cell 1. Specifically, after the battery pack is installed and fixed, the tray structure serves as the side wall of the shell 2, and a gap is formed between the battery module composed of the tray 3 and the battery cell 1, and the gap portion serves as a filling area for filling with insulating coolant. In some embodiments, the shell 2 does not include the cold plate 21, but the cold plate 21 is arranged on the inner side wall of the shell 2, and the structure of the cold plate 21 is used to contact the battery cell 1 to dissipate heat from the main body of the battery cell 1.

[0030] In the battery pack of the present application, a filling area 4 is formed between the inside of the shell 2 and the battery cell 1, and an insulating coolant 5 is filled in the filling area 4. When the connecting components of the battery cells in the battery cell 1 generate heat, the generated heat can be absorbed by the insulating coolant 5, thereby avoiding local high temperature in the battery pack, which can effectively reduce safety risks and increase the service life of the battery pack.

[0031] Exemplarily, the number of battery cells 1 in the battery pack ranges from a few to hundreds, and adjacent battery cells 1 can be connected together by bonding or the like. Moreover, the electrical connection between adjacent battery cells 1 is performed by a connecting member. In the embodiment of the present application, the connecting member includes a pole 11, and the electric energy in the battery cell 1 is led out by the pole 11. The battery pack also includes a connector 6. The connector 6 and the pole 11 are connected by welding or bonding or the like. The positive pole of a single battery cell 1 is electrically connected to the negative pole of an adjacent battery cell 1 through the connector 6, and the negative pole of a single battery cell 1 is also electrically connected to the positive pole of an adjacent battery cell 1 through the connector 6, thereby realizing the electrical connection of all battery cells 1 (such as connecting all battery cells in series).

[0032] Heat can be transferred between the cold plate 21 and the battery cell 1, and part of the heat generated by the battery cell 1 can be taken away by the cold plate 21. In addition, in some embodiments, the housing 2 also includes a protective shell, which is arranged outside the cold plate 21 to provide mechanical support for the entire battery pack.

[0033] Exemplarily, the edge of the tray 3 is fixedly connected to the cold plate 21, and a gap is left between the side of the battery cell 1 close to the tray 3 and the tray 3. The gap formed by the battery module composed of the cold plate 21, the battery cell 1, and the tray 3 serves as the filling area 4. Among them, the filling area 4 is a sealing area in the battery pack, and the connection between the shell 2 and the tray 3, and the connection between the shell 2 and the battery cell 1 are all sealed. The thickness of the filling area 4 is 20-40mm, and the poles 11 of each battery cell in the battery cell 1 are all located in the filling area 4. The filling area 4 is set between the battery cell 1 and the tray 3. In addition to being used for filling the insulating coolant 5, it can also provide a certain buffer space for the pole 11. When the tray 3 is impacted, it will not directly act on the pole 11 of the battery, thereby avoiding damage to the pole 11. Therefore, the direct contact between the tray 3 and the pole 11 is not used.

[0034] Exemplarily, the connector 6 is a connecting piece, and the connecting piece is made of a good conductive metal. Exemplarily, the insulating coolant 5 is an organic mixed solvent, and the boiling point is less than 100 degrees Celsius. This application does not involve improvements to the coolant material, and the coolant used is a known material on the market.

[0035] like Figure 1As shown, the insulating coolant 5 in the embodiment of the present application completely fills the entire filling area 4. It should be noted that the battery pack in the figure of the present application is in a state after the whole is installed and fixed in the working position, and the tray 3 is located on one side of the battery pack instead of at the bottom of the battery pack. When the battery cell 1 generates heat during operation, on the one hand, the heat can be directly transferred to the cold plate 21 for heat dissipation. On the other hand, the insulating coolant 5 can absorb the heat at the pole 11 and the connector 6, and then transfer the heat to the cold plate 21 and the tray 3, so as to achieve heat dissipation of the connector 6 and the pole 11, avoid the occurrence of local hot spots, and improve the overall heat dissipation effect of the battery cell 1. In addition, because the insulating coolant 5 is in contact with the battery cell 1 and has a low specific heat capacity, it can reduce the rate of temperature rise of the battery cell 1, further reduce the risk of high temperature during the use of the battery pack, and improve the safety of the battery pack.

[0036] Exemplarily, for the insulating coolant 5, after absorbing the heat of the pole 11, the connector 6 and the battery cell 1, it realizes internal heat transfer by convection. In order to accelerate the convection of the insulating coolant 5, the battery pack in the embodiment of the present application also includes a convection device to accelerate the flow speed of the insulating coolant 5 in the filling area 4 to improve the heat dissipation effect. The convection device (not shown in the figure) is installed on the tray 3 or the shell 2. The convection device includes a driving member, which is located below the liquid level of the insulating coolant to accelerate the flow of the insulating coolant during operation. The driving member includes but is not limited to a water pump, a fan blade, a stirring rod, a propeller, etc. The convection device is located below the liquid level of the insulating coolant 5, and acts on the insulating coolant 5 during operation, thereby accelerating the flow speed of the insulating coolant 5 to increase the rate of heat transfer, thereby improving the effect of heat dissipation through the insulating coolant 5.

[0037] Exemplarily, the convection device is electrically connected to the battery cells, and the battery cells in the battery pack provide electrical energy to the convection device.

[0038] In the battery pack of the present application, the shell 2 is arranged outside the battery cell 1, and a filling area 4 is formed by the battery cell 1, the shell 2 and the tray 3. The pole 11 of the battery cell in the battery cell 1 is arranged in the filling area 4, and the filling area 4 is filled with insulating coolant 5, which absorbs the heat generated by the pole 11 part and transfers the heat to the entire filling area 4 through the convection of the coolant to dissipate the heat, thereby avoiding the occurrence of local high-temperature hot spots at the pole 11 position. In addition, the convection device can accelerate the flow of the insulating coolant 5 in the filling area 4, increase the rate of heat transfer to further improve the heat dissipation effect, and the present application can effectively dissipate the heat of the battery pack to reduce safety risks and increase the service life of the battery.

[0039] Embodiment 2

[0040] like Figure 2 As shown, an embodiment of the present application provides a battery pack, which includes: a battery cell 1; a connecting member, which is electrically connected to the battery cell 1; a shell 2, which is used to accommodate the battery cell 1, and the battery cell 1 is arranged inside the shell 2; a filling area 4 is formed between the side wall of the shell 2 and the battery cell 1, the connecting member is located in the filling area 4, and the filling area 4 is filled with an insulating coolant 5 for cooling the battery cell and the connecting member.

[0041] In the embodiment of the present application, the connecting member includes a pole 11, and the battery pack further includes a connecting member 6. Compared with the above-mentioned embodiment 1, the difference of the embodiment of the present application is that the insulating coolant 5 does not completely fill the entire filling area 4, but the connecting member 6 and the pole 11 are completely immersed in the insulating coolant 5.

[0042] Compared with the above-mentioned embodiment 1, the insulating coolant 5 in the present application is filled with less, so that the cost of the insulating coolant 5 is lower. In addition, after the insulating coolant 5 absorbs the heat of the pole 11 and the connector 6, the temperature of the insulating coolant 5 will rise and evaporate (gasification and heat absorption), and the evaporated gas will liquefy (liquefaction and heat release) after contacting the cold plate 21. In the process of gas-liquid conversion, heat transfer between the cold plate 21 is achieved, and the heat of the pole 11 and the connector 6 is transferred to the cold plate 21 to achieve heat dissipation.

[0043] Exemplarily, the battery pack in the embodiment of the present application is also provided with a convection device to accelerate the flow speed of the insulating coolant 5 in the filling area 4 and improve the heat dissipation effect. The convection device (not shown in the figure) is installed on the tray 3 or the housing 2. The convection device includes but is not limited to a water pump, a fan blade, a stirring rod, a propeller, etc. The convection device is located below the liquid level of the insulating coolant 5 and acts on the insulating coolant 5 during operation, thereby accelerating the flow speed of the insulating coolant 5 to increase the rate of heat transfer, thereby improving the effect of heat dissipation through the insulating coolant 5. Because the convection device accelerates the heat transfer of the insulating coolant 5, it can accelerate the evaporation of the insulating coolant 5 to achieve heat transfer.

[0044] The battery pack in the present application forms a filling area 4 through the battery cell 1, the shell 2 and the tray 3. The pole 11 of the battery cell in the battery cell 1 is arranged in the filling area 4. The filling area 4 is filled with insulating coolant 5, which absorbs the heat generated by the pole 11 and transfers the heat to the entire filling area 4 through the convection of the insulating coolant 5 and dissipates the heat, thereby avoiding the occurrence of local high-temperature hot spots at the pole 11. The insulating coolant 5 takes away the heat of the pole 11 and the connector 6 by convection, and can also transfer heat to the cold plate 21 (tray 3) by evaporation and condensation, thereby achieving heat dissipation in the filling area 4.

[0045] In addition, the convection device can accelerate the flow of the insulating coolant 5 in the filling area 4, increase the rate of heat transfer to further improve the heat dissipation effect. The present application can effectively dissipate the heat of the battery pack to reduce safety risks and increase the service life of the battery.

[0046] Embodiment 3

[0047] like Figure 3 As shown, an embodiment of the present application provides a battery pack, which includes: a battery cell 1; a connecting member, which is electrically connected to the battery cell 1; a shell 2, which is used to accommodate the battery cell 1, and the battery cell 1 is arranged inside the shell 2; a filling area 4 is formed between the side wall of the shell 2 and the battery cell 1, the connecting member is located in the filling area 4, and the filling area 4 is filled with an insulating coolant 5 for cooling the battery cell and the connecting member.

[0048] In the embodiment of the present application, the connecting member includes a connecting member 6 and a pole 11. Compared with the above-mentioned embodiment 1, the difference of the embodiment of the present application is that the insulating coolant 5 in the embodiment of the present application does not fill the entire filling area 4, and the connecting member 6 and the pole 11 are at least partially exposed above the liquid surface of the insulating coolant 5 (such as Figure 3 The connector 6 and the pole 11 are completely located at the liquid level of the insulating coolant 5. Compared with the solutions of the first and second embodiments, the filling cost of the insulating coolant 5 can be further reduced.

[0049] Because the insulating coolant 5 is not in direct contact with the pole 11 and the connector 6, the heat of the pole 11 and the connector 6 is no longer taken away by convection. When the overall temperature of the battery cell 1 rises, the insulating coolant 5 will evaporate and liquefy. When the insulating coolant 5 drips onto the pole 11 and the connecting piece, the evaporation process of the insulating coolant 5 can take away the heat on the connecting piece and the pole 11, thereby achieving the effect of heat dissipation. Compared with the above-mentioned embodiment one and embodiment two, the embodiment of the present application can use an organic solvent with a lower boiling point, including but not limited to fluorinated liquid and silicone oil, wherein the boiling point of the fluorinated liquid generally does not exceed 50 degrees Celsius, and can quickly vaporize to take away the heat after the battery pack generates heat.

[0050] like Figure 3-Figure 4 As shown, because the liquid level of the insulating coolant 5 is low, in order to quickly exchange heat between the insulating coolant 5, the connector 6 and the pole 11, the battery pack in the embodiment of the present application further includes a circulation device 7, which is arranged on the housing 2, the cold plate 21 or the tray 3 ( Figure 4The circulation device 7 is arranged on the cold plate 21, and the circulation device 7 includes a circulation pipe 71, and the circulation pipe 71 is connected to the filling area 4. The circulation pipe 71 is connected to a circulation pump 72 to circulate the insulating coolant 5 between the circulation pipe 71 and the filling area 4.

[0051] Figure 4 The circulation pipe 71 in the circuit is arranged on the cold plate 21, and a coolant dripping hole 73 is arranged on the cold plate 21 at the top, and the coolant dripping hole 73 is connected to the water outlet of the circulation pipe 71. A coolant recovery hole 74 is arranged on the cold plate 21 at the bottom, and the coolant recovery hole 74 is connected to the water inlet of the circulation pipe 71, and the opening direction of the coolant dripping hole 73 is arranged toward the connector 6 or the pole 11. After the circulation pump 72 connected to the circulation pipe 71 works, the coolant is extracted from the coolant recovery hole 74 at the bottom and sent to the coolant dripping hole 73, and then dripped onto the connector 6 or the pole 11. After the temperature of the pole 11 and the connector 6 rises, the evaporation of the coolant is accelerated, thereby taking away the heat of the connector 6 and the pole 11, and avoiding the occurrence of local high-temperature hot spots. The structure of the circulation pipe 71 and the circulation pump 72 can accelerate the heat transfer between the coolant and the connector 6 and the pole 11, thereby improving the heat dissipation effect on the pole 11 and the connector 6.

[0052] In some embodiments, an atomizing nozzle is also provided on the coolant dripping hole 73 on the cold plate 21, and the dripping hole is configured as an atomizing hole, so that the coolant will be atomized from larger droplets to smaller mist droplets when falling, and it is easier to form a larger contact surface when contacting the connector 6 or the pole 11, and the heat transfer process is more uniform and efficient.

[0053] Exemplarily, the circulation pump 72 in the embodiment of the present application is electrically connected to the battery cell 1 , thereby providing electrical energy to the circulation pump 72 .

[0054] The battery pack in this application forms a filling area 4 through the battery cell 1, the shell 2 and the tray 3. The pole 11 of the battery cell in the battery cell 1 is set in the filling area 4, and the filling area 4 is filled with insulating coolant 5. Under the action of the circulation device 7, the coolant will constantly contact the pole 11 and the connector 6, thereby absorbing the heat generated by the pole 11 and transferring it to the cold plate 21, which can improve the heat dissipation efficiency. Therefore, the solution of this application can effectively dissipate heat from the battery pack to reduce safety risks and increase the service life of the battery.

[0055] Embodiment 4

[0056] An embodiment of the present application provides a battery pack, comprising a battery cell 1; a connecting member, wherein the connecting member is electrically connected to the battery cell 1; a shell 2, wherein the shell 2 is used to accommodate the battery cell 1, and the battery cell 1 is arranged inside the shell 2; a filling area 4 is formed between the side wall of the shell 2 and the battery cell 1, the connecting member is located in the filling area 4, and the filling area 4 is filled with an insulating coolant 5 for cooling the battery cell and the connecting member.

[0057] The difference between the embodiment of the present application and the above-mentioned embodiment 1 is that the connecting member in the embodiment of the present application includes a pole ear, and the positive pole ear and the negative pole ear of adjacent battery cells are electrically connected to achieve electrical connection between adjacent battery cells. Among them, the battery cell can be a single soft-pack battery. Compared with the above-mentioned embodiment, the local high-temperature area when the battery pack is working is the position of the pole ear, and the heat generated by the pole ear can be absorbed by the insulating coolant to avoid local heat preservation.

[0058] In the battery pack of the present application, a filling area 4 is formed between the inside of the shell 2 and the battery cell 1, and an insulating coolant 5 is filled in the filling area 4. When the connecting components of the battery cells in the battery cell 1 generate heat, the heat generated by the tabs on the battery cells can be absorbed by the insulating coolant 5, thereby avoiding local high temperatures in the battery pack, which can effectively reduce safety risks and increase the service life of the battery pack.

[0059] Embodiment 5

[0060] An embodiment of the present application provides an electrical device, and the electrical device includes the battery pack described in any one of the above-mentioned embodiments 1 to 3.

[0061] A filling area 4 is formed between the shell 2 and the battery cell 1. The insulating coolant 5 is filled in the filling area 4. When the connecting components of the battery cell 1 generate heat, the insulating coolant 5 can absorb the heat generated by the tabs on the battery cell, thereby avoiding local high temperature in the battery pack, effectively reducing safety risks and increasing the service life of the battery pack. This can then improve the safety of the entire electrical equipment.

[0062] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. A person of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0063] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0064] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with features less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0065] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0066] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0067] The above is only a specific implementation or description of a specific implementation of the present application, and the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A battery pack, characterized in that: The battery pack comprises: Battery cells; A connecting member, the connecting member being electrically connected to the battery cell; A shell, the shell is used to accommodate the plurality of battery cells, the battery cells are arranged inside the shell; a filling area is formed between the side wall of the shell and the battery cells, the connecting member is located in the filling area, and the filling area is filled with an insulating coolant for cooling the battery cells and the connecting member.

2. The battery pack according to claim 1, characterized in that: The connecting member includes a pole, and the battery pack also includes a connector connected to the pole. The battery pack includes a plurality of battery cells, and the positive pole of each battery cell is electrically connected to the negative pole of an adjacent battery cell through the connector.

3. The battery pack according to claim 2, characterized in that: The insulating coolant completely immerses the pole and the connecting piece.

4. The battery pack according to claim 2, characterized in that: The insulating coolant completely fills the filling area.

5. The battery pack according to claim 2, characterized in that: At least a portion of the connecting member and the pole are exposed above the liquid level of the insulating coolant.

6. The battery pack according to any one of claims 3 to 5, characterized in that: The battery pack further includes a convection device, which is disposed on the shell.

7. The battery pack according to claim 6, characterized in that: The convection device comprises a driving member, and the driving member is located below the liquid level of the insulating coolant to accelerate the flow of the insulating coolant during operation.

8. The battery pack according to claim 7, characterized in that: The driving member includes a water pump and / or a fan blade.

9. The battery pack according to claim 5, characterized in that: It also includes a circulation device, which is used to drive the insulating coolant to circulate between the circulation device and the filling area, and to enable the pole and / or the connecting piece to exchange heat with the insulating coolant.

10. The battery pack according to claim 9, characterized in that: The circulation device includes a circulation pipe arranged on the shell, and the circulation pipe is connected to the filling area; the shell is provided with a coolant recovery hole and a coolant dripping hole connected to the filling area, and the two ends of the circulation pipe are respectively connected to the coolant recovery hole and the coolant dripping hole, wherein the coolant dripping hole is arranged toward the connecting piece or the pole, so that the connecting piece and / or the pole can exchange heat with the insulating coolant.

11. The battery pack according to claim 10, characterized in that: The circulation pipeline is connected to a circulation pump, and the circulation pump is used to drive the insulating coolant to circulate between the circulation pipeline and the filling area.

12. The battery pack according to claim 1, characterized in that: The connecting member includes a tab, which is disposed on the battery cell and electrically connected to the tabs of adjacent battery cells.

13. The battery pack according to any one of claims 1 to 5 and 7 to 12, characterized in that: It also includes a cold plate, which is thermally connected to the battery cell.

14. The battery pack according to any one of claims 1 to 5 and 7 to 12, characterized in that: The housing includes a tray, and the filling area is located between the tray and the battery cell.

15. An electrical equipment, characterized in that: The electrical device comprises the battery pack according to any one of claims 1-14.

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