Battery pack, electric equipment and vehicle

Abstract

The utility model provides a battery pack, electric equipment and a vehicle, and relates to the technical field of battery packs. The battery pack comprises a battery cell group, a restraining assembly and an adjusting assembly, the battery cell group comprises a plurality of battery cells sequentially arranged in the first direction, the restraining assembly comprises a restraining piece, the restraining piece abuts against one end, in the first direction, of the battery cell group, and / or the restraining piece abuts against the adjacent battery cells, the restraining piece is used for containing liquid, and the adjusting assembly is used for adjusting the liquid. And the adjusting assembly adjusts the constraining force of the constraining piece on the battery cell group by adjusting the amount of the liquid in the constraining piece. According to the battery pack provided by the invention, the safety performance of the battery pack can be improved, meanwhile, the service life of the battery pack is prolonged, the battery pack is not easy to abrade or damage during long-term use, the constraint on the battery cell group is not easy to lose efficacy, and the reliability is relatively good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery pack, and in particular to a battery pack, an electric device and a vehicle. BACKGROUND

[0002] The battery pack comprises a shell and a cell group located in the shell, and the cell group comprises a plurality of cells arranged in sequence. In order to ensure the safety and service life of the battery, a constraint structure for constraining the cells is usually arranged in the battery pack.

[0003] In the prior art, the constraint structure is prone to failure after long-term use, and the reliability is poor. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a battery pack, an electric device and a vehicle to solve the problem of poor reliability of the constraint structure in the prior art.

[0005] In a first aspect, the present application provides a battery pack, comprising:

[0006] a cell group comprising a plurality of cells arranged in sequence along a first direction;

[0007] a constraint assembly comprising a constraint member, the constraint member abutting one end of the cell group along the first direction, and / or the constraint member abutting adjacent cells, and the constraint member being used for containing liquid;

[0008] an adjusting assembly for adjusting the amount of liquid in the constraint member to adjust the constraint force of the constraint member on the cell group.

[0009] In some embodiments, at least one liquid storage member is further included, the liquid storage member is used for storing the liquid, and the constraint member is in communication with the liquid storage member.

[0010] The adjusting assembly is used for adjusting the amount of liquid between the constraint member and the liquid storage member.

[0011] In some embodiments, a connecting pipe is further included, and the connecting pipe communicates the constraint member and the liquid storage member.

[0012] In some embodiments, the connecting pipe is at least one.

[0013] In some embodiments, the adjusting assembly comprises a liquid pump, the liquid pump is arranged on the connecting pipe, and the liquid pump is used for driving the liquid in the liquid storage member to flow into the constraint member through the connecting pipe, or driving the liquid in the constraint member to flow into the liquid storage member through the connecting pipe.

[0014] In some embodiments, the adjusting assembly further comprises a pressure detecting member for detecting the liquid pressure in the connecting pipe or the liquid pressure in the constraint member.

[0015] The liquid pump is configured to drive the liquid in the liquid storage member to flow into the constraint member or drive the liquid in the constraint member to flow into the liquid storage member according to the liquid pressure.

[0016] In some embodiments, the adjusting assembly comprises a control valve arranged on the connecting pipe to connect or disconnect the connecting pipe.

[0017] In some embodiments, the control valve is at least one.

[0018] In some embodiments, the control valve is arranged on the connecting pipe one by one.

[0019] In some embodiments, the connecting pipe comprises a first branch pipe and a second branch pipe, the first branch pipe connecting the constraint member and the liquid storage member, and the second branch pipe connecting the constraint member and the liquid storage member.

[0020] The control valve comprises a first one-way valve and a second one-way valve, the first one-way valve being arranged on the first branch pipe, and the second one-way valve being arranged on the second branch pipe, the conducting direction of the first one-way valve being opposite to the conducting direction of the second one-way valve.

[0021] In some embodiments, a housing is further included, the housing having a connecting portion, the liquid storage member being located outside the housing, and the connecting portion connecting the constraint member and the liquid storage member.

[0022] In some embodiments, a control member is further included, the control member being electrically connected with the adjusting assembly, and the control member controlling the adjusting assembly to adjust the amount of liquid in the constraint member.

[0023] In some embodiments, the constraint member comprises a shell, the shell comprising opposite first and second side plates, at least one of the first and second side plates abutting against the battery cell.

[0024] In some embodiments, the constraint member further comprises a plurality of connecting ribs connecting the first and second side plates.

[0025] The connecting ribs are arranged in sequence in a second direction and gradually decrease in spacing from the middle region to the two ends of the first side plate.

[0026] In some embodiments, in a third direction, the thickness of the first side plate gradually increases from the middle to the two ends of the first side plate.

[0027] and / or, in the third direction, the thickness of the second side plate gradually increases from the middle of the second side plate to both ends.

[0028] In some embodiments, the constraint component is one;

[0029] Alternatively, the constraint component is at least two, and each of the constraint components is in communication with each other.

[0030] In some embodiments, further comprising at least one limiting component, the limiting component is arranged at one end of the group of battery cells in the first direction;

[0031] The constraint component abuts between the limiting component and the battery cell, and / or the constraint component abuts between two adjacent battery cells.

[0032] In a second aspect, the present application provides a battery pack, comprising a device body and the above-mentioned battery pack arranged on the device body.

[0033] In a third aspect, the present application provides a vehicle, comprising a vehicle body and the battery pack in the first aspect arranged on the vehicle body.

[0034] The battery pack, the electrical equipment and the vehicle provided by the present application, the battery pack is provided with a constraint assembly, the constraint assembly comprises a constraint component, the constraint component abuts at one end of the group of battery cells in the first direction, and / or the constraint component abuts with the adjacent battery cell, so as to provide constraint for the group of battery cells through the constraint component, thereby improving the stability of the group of battery cells. The constraint component is used for containing liquid. The amount of liquid in the constraint component is adjusted through the adjusting assembly, so as to adjust the constraint force of the constraint component on the group of battery cells. Therefore, the constraint force of the constraint component on the group of battery cells can be adjusted to a suitable constraint force through the adjusting assembly, so as to avoid the deformation or movement of the battery cell caused by the constraint force of the constraint component on the group of battery cells being too large or too small, thereby improving the safety performance of the battery pack, and reducing the mechanical stress of the battery cell caused by expansion and contraction, thereby prolonging the service life of the battery pack. Compared with the fixing belt in the prior art, the strength and rigidity of the constraint component are higher, and the constraint component is not easy to wear or damage in long-term use, and can maintain a longer constraint effect, so that the constraint of the constraint assembly on the group of battery cells is not easy to fail, and the reliability is better. BRIEF DESCRIPTION OF DRAWINGS

[0035] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0036] Figure 1 Part of the structure of the battery pack provided by the embodiments of the present application Figure 1 ;

[0037] Figure 2 Figure 1 is a schematic diagram of an explosion; Figure 1

[0038] Figure 3 Figure 2 is a schematic diagram of a part of a battery pack provided by an embodiment of the application; Figure 2

[0039] Figure 4 Figure 3 is a schematic diagram of a part of a battery pack provided by an embodiment of the application; Figure 3

[0040] Figure 5 Figure 4 is a schematic diagram of a part of a battery pack provided by an embodiment of the application; Figure 4

[0041] Figure 6 Figure 5 is a schematic diagram of a constraint assembly, a regulating assembly, a liquid storage member and a connecting pipe provided by an embodiment of the application; Figure 1

[0042] Figure 7 Figure 6 is a schematic diagram of a constraint assembly, a regulating assembly, a liquid storage member and a connecting pipe provided by an embodiment of the application; Figure 2

[0043] Figure 8 Figure 7 is a schematic diagram of a constraint assembly, a regulating assembly, a liquid storage member and a connecting pipe provided by an embodiment of the application; Figure 3

[0044] Figure 9 Figure 8 is a schematic diagram of a constraint assembly, a regulating assembly, a liquid storage member and a connecting pipe provided by an embodiment of the application; Figure 4

[0045] Figure 10 Figure 9 is a schematic diagram of a constraint member provided by an embodiment of the application;

[0046] Figure 11 Figure 10 is a schematic diagram of another view of the structure of Figure 9; Figure 10

[0047] Figure 12 Figure 11 is a cross-sectional view of A-A in Figure 10; Figure 11 Figure 1

[0048] Figure 12 is a cross-sectional view of A-A in Figure 10; Figure 13 Figure 11 Figure 2

[0049] Figure 14 Figure 11 Figure 13 is a cross-sectional view of A-A in Figure 10. Figure 3

[0050] ​​​​​​​​​​​​​​​The specific embodiments of the present application have been shown by the above drawings, and will be described in more detail hereinafter. These drawings and written description are not intended to restrict the scope of the present inventive concept in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments.

[0051] Explanation of reference numerals:

[0052] 100 - housing; 110 - connecting portion;

[0053] 200 - battery cell group; 210 - battery cell;

[0054] 300 - restraining assembly; 310 - restraining member; 311 - first accommodating cavity; 312 - outer shell; 313 - first side plate; 314 - second side plate; 315 - connecting rib; 316 - liquid inlet pipe; 317 - liquid outlet pipe;

[0055] 400 - adjusting assembly; 410 - liquid pump; 420 - pressure detecting member; 430 - control valve; 431 - first one-way valve; 432 - second one-way valve;

[0056] 500 - liquid storage member; 510 - second accommodating cavity;

[0057] 600 - connecting pipe; 610 - first branch pipe; 620 - second branch pipe; 630 - series pipe line;

[0058] 700 - control member;

[0059] 800 - limiting member. DETAILED DESCRIPTION

[0060] The exemplary embodiments will be described in detail below with reference to the drawings. Unless otherwise specified, the same or similar components are denoted by the same or similar reference numerals throughout the different drawings. The embodiments described in the following exemplary embodiments are not representative of all embodiments consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0061] In the prior art, a battery pack includes a shell, a cell group and a constraint structure, and the cell group and the constraint structure are both located in the shell. The cell group includes a plurality of cells arranged in sequence. The constraint structure includes a fixing belt, a tightening member and two limit members, the two limit members are respectively arranged at two ends of the cell group in the arrangement direction of the cells, and the fixing belt connects the two limit members. The fixing belt can be tightened by the tightening member to adjust the pre-tightening force between the two limit members, and then the cell group is provided with constraint. However, the above fixing belt is prone to relaxation after long-term use. In order to ensure the pre-tightening force of the cell group by the two limit members, the fixing belt needs to be further tightened by the tightening member. Once the stretching limit of the fixing belt is reached, the fixing belt will be broken, resulting in the failure of the constraint of the constraint structure to the cell group, and the reliability of the constraint structure is poor.

[0062] Based on this, the battery pack provided by the embodiments of the present application sets a constraint assembly, the constraint assembly includes a constraint member, the constraint member abuts against one end of the cell group in the first direction, and / or the constraint member abuts against the adjacent cell, so as to provide constraint for the cell group by the constraint member, and then the stability of the cell group is improved. The constraint member is used for containing liquid. The amount of the liquid in the constraint member is adjusted by the adjusting assembly, so as to adjust the constraint force of the constraint member to the cell group. In this way, the constraint force of the constraint member to the cell group can be adjusted to an appropriate constraint force by the adjusting assembly, so as to avoid the deformation or movement of the cell caused by the constraint force of the constraint member to the cell group being too large or too small, and then the safety performance of the battery pack is improved, and at the same time, the mechanical stress of the cell caused by expansion and contraction can be reduced, and then the service life of the battery pack is prolonged. Compared with the fixing belt in the prior art, the strength and rigidity of the constraint member are higher, and the constraint member is not prone to wear or damage in long-term use, and can maintain a longer constraint effect, so that the constraint of the constraint assembly to the cell group is not prone to failure, and the reliability is better.

[0063] The embodiments of the present application will be described below with reference to the drawings.

[0064] Reference Figures 1 to 14 The battery pack provided by the embodiments of the present application includes a cell group 200, a constraint assembly 300 and an adjusting assembly 400. The cell group 200 includes a plurality of cells 210 arranged in sequence in a first direction.

[0065] The constraint assembly 300 includes a constraint member 310, the constraint member 310 abuts against one end of the cell group 200 in the first direction, and / or the constraint member 310 abuts against the adjacent cell 210, and the constraint member 310 is used for containing liquid.

[0066] The adjusting assembly 400 adjusts the amount of the liquid in the constraint member 310, so as to adjust the constraint force of the constraint member 310 to the cell group 200.

[0067] The liquid in the application can be fire-retardant hydraulic oil, fire-retardant organic solvent, purified water, and the like, which have good corrosion resistance, fire resistance, and insulation performance.

[0068] The battery pack also includes a shell 100, and the cell group 200 and the restraint member 310 are arranged in the shell 100. In the application, Figures 1 to 5 The shell 100 in the application is a partial shell 100. The first direction refers to the arrangement direction of the cells 210 in the cell group 200, and specifically refers to Figure 1 The shell 100 includes a battery tray, and the cell group 200 is arranged on the battery tray. The cells 210 are sequentially arranged in the first direction to form the cell group 200, and the larger side surfaces of the adjacent two cells 210 are in contact. The cell 210 at the end of the cell group 200 in the first direction can abut against the inner wall of the shell 100 to limit the position of the cell group 200. The restraint member 310 can abut between the adjacent two cells 210. Alternatively, the restraint member 310 can abut between the cell 210 at the end of the cell group 200 in the first direction and the inner wall of the shell 100. Alternatively, the number of restraint members 310 can be at least two, at least one restraint member 310 abuts between the adjacent two cells 210, and at least one restraint member 310 abuts between the cell 210 at the end of the cell group 200 in the first direction and the inner wall of the shell 100. Thus, the cell group 200 can be constrained by the restraint member 310.

[0069] It can be understood that when the cell 210 expands, the restraint force of the restraint member 310 on the cell group 200 also needs to increase. When the cell 210 shrinks, the restraint force of the restraint member 310 on the cell group 200 also needs to decrease. In actual implementation, the appropriate restraint force required by the cell group 200, i.e., the preset restraint force, can be calculated according to the current state of charge of the cell group 200, the temperature of the cell 210, the aging degree of the cell 210 of the cell group 200, the charging power of the cell 210, the discharging power of the cell 210, and the like. The preset restraint force can be a range value.

[0070] Specifically, the constraint member 310 has a first accommodating cavity 311 therein, and the first accommodating cavity 311 is used to accommodate liquid. The first accommodating cavity 311 can be filled with liquid. Due to the incompressibility of the liquid, when the amount of the liquid in the first accommodating cavity 311 is increased by adjusting the adjusting assembly 400, the volume of the first accommodating cavity 311 is increased, and thus the constraint force of the constraint member 310 on the battery cell group 200 is increased. When the amount of the liquid in the first accommodating cavity 311 is reduced by adjusting the adjusting assembly 400, and under the pressure of the battery cell 210 on the constraint member 310, the volume of the constraint member 310 is reduced, and thus the constraint force of the constraint member on the battery cell group 200 is reduced. Therefore, the amount of the liquid in the first accommodating cavity 311 can be adjusted by the adjusting assembly 400, so as to adjust the constraint force of the constraint member 310 on the battery cell group 200.

[0071] The battery pack provided by the embodiments of the present application comprises the constraint assembly 300, the constraint assembly 300 comprises the constraint member 310, the constraint member 310 abuts against one end of the battery cell group 200 along the first direction, and / or the constraint member 310 abuts against the adjacent battery cell 210, so as to provide constraint for the battery cell group 200 by the constraint member 310, and thus the stability of the battery cell group 200 is improved. The constraint member 310 is used to accommodate liquid. The amount of the liquid in the constraint member 310 is adjusted by the adjusting assembly 400, so as to adjust the constraint force of the constraint member 310 on the battery cell group 200. Therefore, the constraint force of the constraint member 310 on the battery cell group 200 can be adjusted to a suitable constraint force by the adjusting assembly 400, so as to avoid the deformation of the battery cell 210 or the movement of the battery cell 210 caused by the constraint force of the constraint member 310 on the battery cell group 200 being too large or too small, and thus the safety performance of the battery pack is improved, and the mechanical stress of the battery cell 210 caused by expansion and contraction can be reduced, and thus the service life of the battery pack is prolonged. Compared with the fixing belt in the prior art, the constraint member 310 has high strength and rigidity, and is not easy to wear or damage in long-term use, and can maintain a longer constraint effect, and thus the constraint of the constraint assembly 300 on the battery cell group 200 is not easy to fail, and the reliability is good. In addition, the constraint member 310 only needs to abut against one end of the battery cell group 200 along the arrangement direction of the battery cell 210 or between the adjacent two battery cells 210, so that the installation and fixation of the constraint member 310 are simple and convenient.

[0072] Reference Figures 1 to 5 In some embodiments, the battery pack provided by the embodiments of the present application further comprises at least one liquid storage member 500, the liquid storage member 500 is used to store liquid, and the constraint member 310 communicates with the liquid storage member 500. The adjusting assembly 400 is used to adjust the amount of the liquid between the constraint member 310 and the liquid storage member 500.

[0073] The liquid storage member 500 has a second containing cavity 510 in which liquid is stored. The first containing cavity 311 is in communication with the second containing cavity 510. By providing the liquid storage member 500, liquid can be stored therein, and the liquid storage member 500 can store the liquid discharged from the constraint member 310 or provide the liquid to the constraint member 310, so as to adjust the amount of liquid in the constraint member 310.

[0074] The adjusting assembly 400 controls the flow of liquid in the first containing cavity 311 to the second containing cavity 510, so as to increase the amount of liquid in the first containing cavity 311, and thus increase the constraint force of the constraint member 310 on the battery cell group 200. Conversely, the adjusting assembly 400 controls the flow of liquid in the second containing cavity 510 to the first containing cavity 311, so as to decrease the amount of liquid in the first containing cavity 311, and thus decrease the constraint force of the constraint member 310 on the battery cell group 200.

[0075] Specifically, when the constraint force of the constraint member 310 on the battery cell group 200 is greater than a preset constraint force, the adjusting assembly 400 controls the flow of liquid in the first containing cavity 311 to the second containing cavity 510, so as to decrease the amount of liquid in the first containing cavity 311, and thus decrease the volume of the constraint member 310 and the constraint force of the constraint member 310 on the battery cell group 200. When the constraint force of the constraint member 310 on the battery cell group 200 is less than the preset constraint force, the adjusting assembly 400 controls the flow of liquid in the second containing cavity 510 to the first containing cavity 311, so as to increase the amount of liquid in the first containing cavity 311, and thus increase the volume of the constraint member 310 and the constraint force of the constraint member 310 on the battery cell group 200.

[0076] Referring to Figures 1 to 5 In a specific implementation, the battery pack provided by the embodiment of the present application further includes a connecting pipe 600, which is in communication with the constraint member 310 and the liquid storage member 500.

[0077] The connecting pipe 600 is provided so that the liquid in the first containing cavity 311 can flow to the second containing cavity 510 through the connecting pipe 600, or the liquid in the second containing cavity 510 can flow to the first containing cavity 311 through the connecting pipe 600. In this way, the liquid can flow between the first containing cavity 311 and the second containing cavity 510.

[0078] In a specific implementation, the connecting pipe 600 is at least one.

[0079] Referring to Figures 6 to 9In some embodiments, the adjusting assembly 400 comprises a liquid pump 410, which is arranged on the connecting pipe 600 and configured to drive the liquid in the liquid storage 500 to flow into the constraint 310 through the connecting pipe 600, or drive the liquid in the constraint 310 to flow into the liquid storage 500 through the connecting pipe 600.

[0080] In some embodiments, the liquid pump 410 is configured to drive the liquid to flow between the first containing cavity 311 and the second containing cavity 510 through the connecting pipe 600, so as to increase the flow rate of the liquid between the first containing cavity 311 and the second containing cavity 510 and improve the flow efficiency of the liquid.

[0081] Specifically, when the constraint force of the constraint 310 on the battery cell group 200 is greater than the preset constraint force, the liquid pump 410 drives the liquid in the first containing cavity 311 to flow into the second containing cavity 510 through the connecting pipe 600, so as to reduce the constraint force of the constraint 310 on the battery cell group 200. When the constraint force of the constraint 310 on the battery cell group 200 is less than the preset constraint force, the liquid pump 410 drives the liquid in the second containing cavity 510 to flow into the first containing cavity 311 through the connecting pipe 600, so as to increase the constraint force of the constraint 310 on the battery cell group 200.

[0082] Reference will now be made in detail to Figures 6 to 9 In some embodiments, the adjusting assembly 400 further comprises a pressure detecting member 420, which is configured to detect the liquid pressure in the connecting pipe 600 or the liquid pressure in the constraint 310.

[0083] The liquid pump 410 is configured to drive the liquid in the liquid storage 500 to flow into the constraint 310, or drive the liquid in the constraint 310 to flow into the liquid storage 500, according to the liquid pressure.

[0084] In some embodiments, the pressure detecting member 420 can be arranged on the connecting pipe 600 to detect the liquid pressure in the connecting pipe 600. Alternatively, the pressure detecting member 420 can be arranged on the constraint 310 to detect the liquid pressure in the constraint 310. According to the liquid pressure in the connecting pipe 600 or the liquid pressure in the first containing cavity 311 detected by the pressure detecting member 420, the constraint force of the constraint 310 on the battery cell group 200 can be determined.

[0085] It can be understood that the liquid pressure detected by the pressure detecting member 420 is generally in a certain functional relationship with the constraint force of the constraint 310 on the battery cell group 200. That is, according to the liquid pressure detected by the pressure detecting member 420, the constraint force corresponding to the liquid pressure can be determined, which is the constraint force of the constraint 310 on the battery cell group 200.

[0086] For example, the pressure detecting member 420 is a pressure sensor.

[0087] Specifically, when the liquid pressure detected by the pressure detecting member 420 is within the range of the preset pressure, it indicates that the constraint force of the constraint member 310 on the battery cell group 200 is within the range of the preset constraint force. When the liquid pressure detected by the pressure detecting member 420 is greater than the preset pressure, it indicates that the constraint force of the constraint member 310 on the battery cell group 200 is greater than the preset constraint force. When the liquid pressure detected by the pressure detecting member 420 is less than the preset pressure, it indicates that the constraint force of the constraint member 310 on the battery cell group 200 is less than the preset constraint force.

[0088] Further, the liquid pump 410 can be electrically connected with the pressure detecting member 420. When the liquid pressure detected by the pressure detecting member 420 is greater than the preset pressure, the liquid pump 410 drives the liquid in the first containing cavity 311 to flow into the second containing cavity 510 through the connecting pipe 600, so as to reduce the constraint force of the constraint member 310 on the battery cell group 200, and the liquid pump 410 is closed when the liquid pressure detected by the pressure detecting member 420 is reduced to the preset pressure. When the liquid pressure detected by the pressure detecting member 420 is less than the preset pressure, the liquid pump 410 drives the liquid in the second containing cavity 510 to flow into the first containing cavity 311 through the connecting pipe 600, so as to increase the constraint force of the constraint member 310 on the battery cell group 200, and the liquid pump 410 is closed when the liquid pressure detected by the pressure detecting member 420 is increased to the preset pressure.

[0089] Referring to Figure 6 In some embodiments, the adjusting assembly 400 further comprises a control valve 430, which is arranged on the connecting pipe 600 to communicate or disconnect the connecting pipe 600.

[0090] By arranging the control valve 430, the communication or disconnection of the connecting pipe 600 is controlled. When the connecting pipe 600 is communicated, the liquid can flow between the first containing cavity 311 and the second containing cavity 510. When the connecting pipe 600 is disconnected, the liquid in the first containing cavity 311 and the liquid in the second containing cavity 510 cannot flow to each other.

[0091] In some embodiments, the liquid pump 410, the pressure detecting member 420 and the control valve 430 are all arranged on the connecting pipe 600, and the control valve 430 is located between the liquid pump 410 and the control valve 430. The liquid pump 410 is close to the liquid storage member 500, and the pressure detecting member 420 is close to the constraint assembly 300.

[0092] Exemplarily, the adjusting assembly 400 further comprises a fixed shell, and the liquid pump 410, the pressure detecting member 420 and the control valve 430 are all located in the fixed shell.

[0093] Further, the control valve 430 can be electrically connected with the pressure detecting member 420. The liquid pump 410 can be reversely rotated, or the liquid pump 410 is provided with a reversing structure. When the liquid pressure detected by the pressure detecting member 420 is less than the preset pressure, the control valve 430 is opened, and at the same time, the liquid pump 410 is started to drive the liquid in the second containing cavity 510 into the first containing cavity 311, until the liquid pressure detected by the pressure detecting member 420 is within the preset pressure range, the liquid pump 410 and the control valve 430 are closed, so that the restraining force of the restraining member 310 on the battery cell group 200 is maintained at the current. When the liquid pressure detected by the pressure detecting member 420 is greater than the preset pressure, the control valve 430 is opened, and at the same time, the liquid pump 410 is started to drive the liquid in the first containing cavity 311 into the second containing cavity 510, until the liquid pressure detected by the pressure detecting member 420 is within the preset pressure range, the liquid pump 410 and the control valve 430 are closed, so that the restraining force of the restraining member 310 on the battery cell group 200 is maintained at the current.

[0094] In a specific implementation, the control valve 430 is at least one.

[0095] In some embodiments, the control valve 430 is one-to-one arranged on the connecting pipe 600.

[0096] With reference to Figures 7 to 9 In some embodiments, the connecting pipe 600 includes a first branch pipe 610 and a second branch pipe 620, the first branch pipe 610 communicates the restraining member 310 with the liquid storage member 500, and the second branch pipe 620 communicates the restraining member 310 with the liquid storage member 500. The control valve 430 includes a first one-way valve 431 and a second one-way valve 432, the first one-way valve 431 is arranged on the first branch pipe 610, the second one-way valve 432 is arranged on the second branch pipe 620, and the conduction direction of the first one-way valve 431 is opposite to the conduction direction of the second one-way valve 432.

[0097] In the specific implementation, the first one-way valve 431 is arranged on the first branch pipe 610, the conduction direction of the first one-way valve 431 is from the first containing cavity 311 to the second containing cavity 510, the pressure detecting member 420 is arranged on the first branch pipe 610, and the pressure detecting member 420 is located between the first one-way valve 431 and the restraining assembly 300. The second one-way valve 432 is arranged on the second branch pipe 620, and the conduction direction of the second one-way valve 432 is from the second containing cavity 510 to the first containing cavity 311. In use, the control of the first one-way valve 431 and the second one-way valve 432 can be omitted.

[0098] With reference to Figure 10 and Figure 11For example, the constraint member 310 is provided with an inlet pipe 316 and an outlet pipe 317, the inlet pipe 316 is provided with a first inlet port, the outlet pipe 317 is provided with a first outlet port, and the first inlet port and the first outlet port are both in communication with the first containing cavity 311. The connecting pipe 600 is sleeved on the inlet pipe 316 and the outlet pipe 317, so that the connecting pipe 600 and the first containing cavity 311 are in communication through the first inlet port and the first outlet port. Specifically, the first branch pipe 610 is connected with the outlet pipe 317, so that the first branch pipe 610 is in communication with the first outlet port, and the second branch pipe 620 is connected with the inlet pipe 316. The liquid storage member 500 is provided with a second inlet port and a second outlet port, the first branch pipe 610 is in communication with the second inlet port, that is, the first branch pipe 610 is in communication with the first outlet port and the second inlet port, and the liquid in the first containing cavity 311 flows into the second containing cavity 510 through the first outlet port, the first branch pipe 610 and the second inlet port in sequence. The second branch pipe 620 is in communication with the second outlet port, that is, the first branch pipe 610 is in communication with the first inlet port and the second outlet port, and the liquid in the second containing cavity 510 flows into the first containing cavity 311 through the first inlet port, the second branch pipe 620 and the second outlet port in sequence.

[0099] With reference to Figure 7 In some embodiments, the first branch pipe 610 and the second branch pipe 620 are separately arranged, the liquid pump 410 is arranged on the second branch pipe 620, and the liquid pump 410 is located between the second one-way valve 432 and the liquid storage member 500. When the liquid pressure detected by the pressure detection member 420 is less than the preset pressure, the liquid pump 410 is started, and the liquid in the second containing cavity 510 is driven by the liquid pump 410 to flow into the first containing cavity 311 through the second one-way valve 432, until the liquid pressure detected by the pressure detection member 420 is within the preset pressure range, the liquid pump 410 is stopped. When the constraint force of the constraint member 310 on the battery cell group 200 is greater than the preset constraint force, the liquid in the first containing cavity 311 can directly flow into the second containing cavity 510 through the first one-way valve 431 under the pressure of the battery cell 210 on the constraint member 310.

[0100] With reference to Figure 8 In some embodiments, the liquid pump 410 can be reversely rotated, or the liquid pump 410 is provided with a reversing structure. The liquid pump 410 can be arranged on the first branch pipe 610 and the second branch pipe 620 at the same time, and the liquid in the second containing cavity 510 can be driven by the liquid pump 410 to flow into the first containing cavity 311 through the second branch pipe 620. At the same time, the liquid pump 410 can drive the liquid in the first containing cavity 311 to flow into the second containing cavity 510 through the first branch pipe 610, thereby improving the flow speed of the liquid in the first containing cavity 311 flowing into the second containing cavity 510.

[0101] With reference to Figure 9In some embodiments, one of the first branch pipe 610 and the second branch pipe 620 communicates the first containing cavity 311 and the second containing cavity 510, and the other one of the first branch pipe 610 and the second branch pipe 620 communicates the first containing cavity 311 and the liquid pump 410. For example, the second branch pipe 620 communicates the first containing cavity 311 and the second containing cavity 510, one end of the first branch pipe 610 communicates the first containing cavity 311, and the other end of the first branch pipe 610 communicates the liquid pump 410. It can be understood that the other end of the first branch pipe 610 can also communicate with the second branch pipe 620 between the liquid storage member 500 and the liquid pump 410, or communicate with the second branch pipe 620 between the liquid pump 410 and the second one-way valve 432.

[0102] With reference to Figure 3 In some embodiments, the battery pack provided by the embodiments of the present application further includes a housing 100, the housing 100 has a connecting portion 110, the liquid storage member 500 is located outside the housing 100, and the connecting portion 110 communicates the constraint member 310 and the liquid storage member 500.

[0103] In the embodiments, the constraint member 310 is connected to the connecting portion 110, and when the constraint force of the constraint member 310 on the battery cell group 200 is greater than or less than a preset constraint force, the liquid storage member 500 is connected to the connecting portion 110, so that the first containing cavity 311 and the second containing cavity 510 are communicated, and then the liquid in the first containing cavity 311 can flow into the second containing cavity 510 or the liquid in the second containing cavity 510 can flow into the first containing cavity 311, so that the amount of the liquid in the first containing cavity 311 can be adjusted.

[0104] For example, part of the connecting pipe 600 is arranged in the housing 100 to connect the constraint assembly 300 and the connecting portion 110, and the rest of the connecting pipe 600 is arranged outside the housing 100 to connect the liquid storage member 500 and the connecting portion 110.

[0105] Further, the liquid pump 410 can also be arranged outside the housing 100, and when it is necessary to adjust the constraint of the constraint member 310 on the battery cell 210, the liquid pump 410 is connected to the connecting pipe 600 outside the housing 100, so that the volume of the housing 100 is further reduced, the volume of the battery pack is reduced, and the energy density of the battery pack is improved.

[0106] In this way, by arranging the liquid storage member 500 outside the housing 100, when it is necessary to adjust the constraint of the constraint member 310 on the battery cell 210, the liquid storage member 500 is connected to the connecting portion 110, the liquid storage member 500 does not occupy the space in the housing 100, the volume of the housing 100 is reduced compared with arranging the liquid storage member 500 in the housing 100, the volume of the battery pack is reduced, and the energy density of the battery pack is improved. At the same time, the design cost and the installation cost of arranging the liquid storage member 500 in the housing 100 are saved.

[0107] With reference to Figures 1 to 9 In a specific implementation, the battery pack provided by the embodiments of the present application further comprises a control member 700, which is electrically connected with the adjusting assembly 400, and the control member 700 controls the adjusting assembly 400 to adjust the amount of liquid in the constraint member 310.

[0108] The control member 700 is electrically connected with the liquid pump 410 and the pressure detection member 420. The control member is configured to determine the size relationship between the constraint force of the constraint member 310 on the battery cell group 200 and the preset constraint force according to the liquid pressure detected by the pressure detection member 420, and control the opening and closing of the liquid pump 410 according to the size relationship between the constraint force of the constraint member 310 on the battery cell group 200 and the preset constraint force, so as to adjust the amount of liquid in the first containing cavity 311.

[0109] For example, the control member 700 can be a battery manager, which is located in the shell 100, and the battery manager is configured to monitor the state of the battery pack and interact with the external information of the battery pack.

[0110] Specifically, the pressure detection member 420 detects the liquid pressure and sends the detected liquid pressure information to the control member 700, and the control member 700 determines the constraint force of the constraint member 310 on the battery cell group 200 according to the liquid pressure information. When the constraint force is greater than the preset constraint force, the control member 700 controls the liquid pump 410 to be turned on, so as to drive the liquid in the first containing cavity 311 to flow into the second containing cavity 510 through the connecting pipe 600, until the constraint force decreases to the preset constraint force, the control member 700 controls the liquid pump 410 to be turned off; when the constraint force is less than the preset constraint force, the control member 700 controls the liquid pump 410 to be turned on, so as to drive the liquid in the second containing cavity 510 to flow into the first containing cavity 311 through the connecting pipe 600, until the constraint force increases to the preset constraint force, the control member 700 controls the liquid pump 410 to be turned off.

[0111] Further, the control member 700 can determine the opening time of the liquid pump 410 according to the difference between the constraint force and the preset constraint force.

[0112] In some embodiments, the control member 700 can be electrically connected with the control valve 430, so as to control the opening or closing of the control valve 430.

[0113] In some embodiments, the liquid pump 410 and the liquid storage member 500 are both located outside the shell 100, and when the constraint force of the constraint member 310 on the battery cell group 200 is greater than or less than the preset constraint force, the control member 700 sends a constraint force too large signal or a constraint force too small signal to the user, so as to remind the user to supplement the liquid in the constraint member 310 through the liquid storage member 500 and the liquid pump 410, or to release part of the liquid in the constraint member 310, so as to adjust the constraint force of the constraint member 310 on the battery cell group 200.

[0114] With reference toFigure 11 and Figure 12 In a specific implementation, the constraint member 310 includes a shell 312, the shell 312 including opposite first and second side plates 313 and 314, at least one of the first and second side plates 313 and 314 being in abutment with the battery cell 210.

[0115] The shell 312 can be a hollow thin-walled flat tube structure, and the shell 312 has a rectangular shape. The shell 312 can be made of metal, rubber, engineering plastic, or fiber-reinforced composite material, etc., so that the shell 312 has good mechanical strength and pressure resistance.

[0116] It can be understood that the first and second side plates 313 and 314 can be deformed, for example, concave towards the inside of the first accommodating cavity 311 or convex towards the side away from the inside of the first accommodating cavity 311, so that the volume of the constraint member 310 changes.

[0117] Specifically, the first and second side plates 313 and 314 are oppositely arranged and have equal areas. When the constraint member 310 is in abutment between two adjacent battery cells 210 in the battery cell group 200, the first and second side plates 313 and 314 are in abutment with the two adjacent battery cells 210. The battery cell 210 also has a rectangular shape, and the side with a larger area of the battery cell 210 is in abutment with the first or second side plate 313 or 314. The area of the first side plate 313 and the area of the second side plate 314 are greater than or equal to the area of the side with a larger area of the battery cell 210.

[0118] Referring to Figure 13 In some embodiments, the constraint member 310 further includes a plurality of connecting ribs 315 connecting the first and second side plates 313 and 314. The connecting ribs 315 are sequentially and spaced apart along the second direction, and the spacing of the connecting ribs 315 gradually decreases from the middle region of the first side plate 313 to the two ends.

[0119] The first and second side plates 313 and 314 are parallel to each other, and the first and second side plates 313 and 314 are both vertically arranged. The connecting ribs 315 are perpendicular to the first and second side plates 313 and 314, the connecting ribs 315 are horizontally arranged, and the connecting ribs 315 are parallel to each other.

[0120] It can be understood that the side with a larger area of the battery cell 210 is the large face of the battery cell 210, and the large face of the battery cell 210 can have the same area as the first side plate 313 and the second side plate 314. When the battery cell 210 expands, the expansion degree of the middle region of the large face of the battery cell 210 in the height direction is greater than the expansion degree of the two ends of the large face of the battery cell 210 in the height direction. When the first side plate 313 abuts against the battery cell 210, the middle region of the first side plate 313 in the height direction abuts against the middle region of the large face of the battery cell 210 in the height direction, and thus the required constraint force of the middle region of the first side plate 313 in the height direction is greater than the required constraint force of the upper and lower ends of the first side plate 313 in the height direction.

[0121] When the distance between the two adjacent connecting ribs 315 is large, the deformable amount of the part of the first side plate 313 and the second side plate 314 between the two adjacent connecting ribs 315 is large, and thus the part of the first side plate 313 and the second side plate 314 between the two adjacent connecting ribs 315 can provide a greater constraint force to the battery cell 210. Conversely, when the distance between the two adjacent connecting ribs 315 is small, the deformable amount of the part of the first side plate 313 and the second side plate 314 between the two adjacent connecting ribs 315 is small, and thus the part of the first side plate 313 and the second side plate 314 between the two adjacent connecting ribs 315 can provide a smaller constraint force to the battery cell 210. Therefore, the distance between the two adjacent connecting ribs 315 gradually decreases from the middle region to the two ends of the constraint member 310 in the second direction. The volume of the middle region of the constraint member 310 in the second direction can change greatly relative to the two ends of the constraint member 310 in the second direction, and thus the middle region of the constraint member 310 in the second direction can provide a greater constraint force to the battery cell 210 to meet the constraint force requirement of the battery cell 210.

[0122] Referring to Figure 13 , specifically, the second direction is Figure 13 the direction indicated by the arrow in the middle, and the height direction of the constraint member 310 is the height direction of the constraint member 310 in use, and the height direction of the first side plate 313 and the height direction of the second side plate 314 are consistent with the height direction of the constraint member 310. The distance between the two adjacent connecting ribs 315 is L1, L2, L3, L4, and L5 from the middle region to the lower end in the first direction, and L1>L2>L3>L4>L5.

[0123] It should be noted that a plurality of connecting ribs 315 can be sequentially arranged on the same horizontal plane, and the distance between the two adjacent connecting ribs 315 is provided so that the liquid in the first containing cavity 311 can flow up and down in the distance to avoid uneven distribution of the liquid in the first containing cavity 311 due to the arrangement of the connecting rib 315. In some embodiments, the avoiding hole can also be provided on the connecting rib 315 to enable the liquid in the first containing cavity 311 to flow through the avoiding hole.

[0124] In some embodiments, the liquid inlet pipe 316 and the liquid outlet pipe 317 are both located between the first side plate 313 and the second side plate 314. Furthermore, the liquid inlet pipe 316 and the liquid outlet pipe 317 can be disposed on the same side of the housing 312.

[0125] Reference Figure 14 In some embodiments, in the third direction, the thickness of the first side plate 313 gradually increases from the middle to the two ends of the first side plate 313; and / or, in the third direction, the thickness of the second side plate 314 gradually increases from the middle to the two ends of the second side plate 314.

[0126] The smaller the thickness of the first and second side panels 313 and 314, the greater their deformability, which in turn increases the volumetric deformability of the restraining member 310. Therefore, the thickness of the middle region of the first side panel 313 in the height direction is set to be smaller than the thickness of the ends of the first side panel 313 in the height direction, and the thickness of the middle region of the second side panel 314 in the height direction is set to be smaller than the thickness of the ends of the second side panel 314 in the height direction. Compared to the ends of the restraining member 310 in the height direction, the volumetric deformability of the middle region of the restraining member 310 in the height direction is greater. This allows the middle region of the restraining member 310 in the height direction to provide a greater restraining force for the battery cells 210, thereby meeting the restraining force requirements of the battery cell pack 200.

[0127] Furthermore, in the third direction, the thickness of the first side plate 313 can gradually increase from the middle portion to both ends according to a regular curve, so that the restraining member 310 can provide different and continuously distributed restraining forces at different positions of the battery cell 210. The second side plate 314 can be configured similarly to the first side plate 313.

[0128] Reference Figure 14 , specifically, the third direction is Figure 14 The direction indicated by the middle arrow, and the third direction is the height direction of the restraint 310 when in use. In the third direction, the thickness of the middle portion of the first side plate 313 is T1, the thickness of the lower end of the first side plate 313 is T2, and T1 <T2。

[0129] Reference Figure 4 and Figure 5 In some embodiments, there is one restraining member 310 , or there are at least two restraining members 310 , and the restraining members 310 are interconnected.

[0130] When the number of the battery cells 210 is small, one constraint member 310 can provide sufficient constraint force for the battery cell group 200. In this case, one constraint member 310 can be provided. When the number of the battery cells 210 is large, a single constraint member 310 cannot provide sufficient constraint force for the battery cell group 200, and the constraint member 310 provides greater constraint force for the battery cell 210 closer to the constraint member 310 and provides smaller constraint force for the battery cell 210 farther from the constraint member 310, which cannot provide uniform constraint force for each of the battery cells 210 in the battery cell group 200.

[0131] Therefore, the present application provides at least two constraint members 310 to expand the adjustable range of the constraint force provided by the constraint assembly 300 for the battery cell group 200. The constraint members 310 are sequentially and spaced apart along the arrangement direction of the battery cells 210 in the battery cell group 200 to provide uniform constraint force for the battery cells 210 at different positions in the battery cell group 200. The first accommodating cavities 311 of the constraint members 310 are connected in series or in parallel with each other to communicate with each other, and the amount of the liquid in the first accommodating cavities 311 of all the constraint members 310 can be adjusted by one adjusting assembly 400, thereby improving the convenience of adjustment.

[0132] Referring to Figure 4 , specifically, Figure 4 The arrow direction in the figure is the arrangement direction of the battery cells 210 in the battery cell group 200, i.e., the first direction. The connecting pipe 600 includes a first branch pipe 610, a second branch pipe 620, and at least one series pipe 630. The liquid inlet pipe 316 of the first constraint member 310 along the arrangement direction of the battery cells 210 in the battery cell group 200 communicates with one of the first branch pipe 610 and the second branch pipe 620, and the liquid outlet pipe 317 of the last constraint member 310 along the arrangement direction of the battery cells 210 in the battery cell group 200 communicates with the other of the first branch pipe 610 and the second branch pipe 620. The series pipe 630 communicates the liquid outlet pipe 317 of one of the adjacent two constraint members 310 with the liquid inlet pipe 316 of the other constraint member 310. Therefore, the first accommodating cavities 311 of the constraint members 310 are connected in series with each other.

[0133] It can be understood that the number of the series pipes 630 can be set according to the number of the constraint members 310, and the number of the series pipes 630 is one less than the number of the constraint members 310. The number of the constraint members 310 can be adaptively set according to the number of the battery cells 210 in the battery cell group 200 and actual needs.

[0134] Referring to Figure 5Specifically, the connecting pipe 600 includes a first branch pipe 610 and a second branch pipe 620. The first branch pipe 610 is sequentially connected to the liquid outlet pipes 317 of the constraint members 310. Each second branch pipe 620 is connected to the liquid inlet pipe 316 of each constraint member 310. In this way, the first accommodating cavities 311 of the constraint members 310 are connected in parallel.

[0135] With reference to Figures 1 to 5 In a specific implementation, the battery pack provided in the embodiment of the application further includes at least one limiting member 800, which is arranged at one end of the battery cell group 200 in the first direction. The constraint member 310 is abutted between the limiting member 800 and the battery cell 210, and / or the constraint member 310 is abutted between two adjacent battery cells 210.

[0136] The limiting member 800 is arranged to limit both ends of the arrangement direction of the battery cells 210 in the battery cell group 200, thereby ensuring the stability of the battery cell group 200.

[0137] For example, the limiting member 800 can be an expansion beam. When the battery cell 210 is charged or discharged, ages, or is affected by the external environment or its own heat, the volume of the battery cell 210 changes. Therefore, the expansion beam is arranged at both ends of the arrangement direction of the battery cell 210 in the battery cell group 200 to constrain the battery cell group 200. The expansion beam can be fixed on the battery tray alone or can be part of the structure of the battery tray.

[0138] In another example, the limiting member 800 can also be an end plate.

[0139] Specifically, the limiting member 800 can be abutted with the battery cell 210 at the end of the arrangement direction of the battery cell 210 in the battery cell group 200, and the constraint member 310 can be abutted between two adjacent battery cells 210. Alternatively, the constraint member 310 can be abutted between the battery cell 210 at the end of the arrangement direction of the battery cell 210 in the battery cell group 200 and the limiting member 800. Alternatively, the number of constraint members 310 can be at least two, at least one constraint member 310 is abutted between two adjacent battery cells 210, and at least one constraint member 310 is abutted between the battery cell 210 at the end of the arrangement direction of the battery cell 210 in the battery cell group 200 and the limiting member 800.

[0140] On the basis of the above-mentioned embodiment, the embodiment of the application provides a power consumption device, which includes a device body and the battery pack in any of the above-mentioned embodiments arranged on the device body.

[0141] The specific structure of the battery pack is described in detail in the above-mentioned embodiment, which will not be described here.

[0142] The power utilization equipment provided by the embodiments of the present application, the battery pack provides constraint for the battery cell group 200 through the constraint member 310, thereby improving the stability of the battery cell group 200. The constraint member 310 is used for containing liquid. The amount of the liquid in the constraint member 310 is adjusted through the adjusting assembly 400, so as to adjust the constraint force of the constraint member 310 on the battery cell group 200. Thus, the constraint force of the constraint member 310 on the battery cell group 200 can be adjusted to a suitable constraint force through the adjusting assembly 400, so as to avoid the deformation of the battery cell 210 or the movement of the battery cell 210 caused by the constraint force of the constraint member 310 on the battery cell group 200 being too large or too small, thereby improving the safety performance of the battery pack, and meanwhile, the mechanical stress of the battery cell 210 caused by expansion and contraction can be reduced, thereby prolonging the service life of the battery pack. Compared with the fixing belt in the prior art, the constraint member 310 has higher strength and rigidity, is not prone to wear or damage in long-term use, can maintain a longer constraint effect, thereby making the constraint of the constraint assembly 300 on the battery cell group 200 not prone to failure, and having better reliability.

[0143] On the basis of the above-mentioned embodiments, the embodiments of the present application further provide a vehicle, comprising a vehicle body and the battery pack in any of the above-mentioned embodiments arranged on the vehicle body.

[0144] The terms "first", "second", etc. in the specification and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so as to implement the embodiments of the present application described herein. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0145] In the embodiments of the present application, the terms "upper", "lower", "inner", "middle", "outer", "front", "back", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain attachment relationship or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the embodiments of the present application can be understood according to the specific circumstances.

[0146] In addition, the terms "set", "connected", and "fixed" should be construed broadly. For example, "connected" can be direct or indirect connection, fixed or detachable connection, or integral configuration; "connected" can be mechanical connection, or electrical connection; "connected" can be direct connection, or through an intermediate medium, or inner communication between two devices, elements or components. The specific meaning of the above terms in the embodiments of the present disclosure can be understood by those skilled in the art according to the specific circumstances.

[0147] The term "plurality" means two or more, unless otherwise specified.

[0148] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope of the application being indicated only by the appended claims.

Claims

1. A battery pack, characterized in that: include: A battery cell group (200) comprising a plurality of battery cells (210) arranged sequentially along a first direction; A restraint assembly (300) includes a restraint member (310), wherein the restraint member (310) abuts against one end of the battery cell group (200) along a first direction, and / or the restraint member (310) abuts against an adjacent battery cell (210), and the restraint member (310) is used to contain liquid; The regulating component (400) regulates the restraining force of the restraining member (310) on the battery cell group (200) by regulating the amount of liquid in the restraining member (310).

2. The battery pack according to claim 1, wherein: It also includes at least one liquid storage member (500), the liquid storage member (500) is used to store the liquid, and the restraining member (310) is in communication with the liquid storage member (500); The regulating assembly (400) is used to regulate the amount of the liquid between the restraining member (310) and the liquid storage member (500).

3. The battery pack according to claim 2, wherein: It also includes a connecting pipe (600), wherein the connecting pipe (600) connects the restraining member (310) and the liquid storage member (500).

4. The battery pack according to claim 3, wherein: There is at least one connecting pipe (600).

5. The battery pack according to claim 3, wherein: The regulating assembly (400) includes a liquid pump (410), which is arranged on the connecting pipe (600). The liquid pump (410) is used to drive the liquid in the liquid storage member (500) to flow into the restraining member (310) through the connecting pipe (600), or to drive the liquid in the restraining member (310) to flow into the liquid storage member (500) through the connecting pipe (600).

6. The battery pack according to claim 5, characterized in that: The regulating assembly (400) further includes a pressure detecting member (420), and the pressure detecting member (420) is used to detect the liquid pressure in the connecting pipe (600) and / or the liquid pressure in the restraining member (310); The liquid pump (410) is configured to drive the liquid in the liquid storage member (500) to flow into the restraining member (310) or drive the liquid in the restraining member (310) to flow into the liquid storage member (500) according to the liquid pressure.

7. The battery pack according to claim 3, characterized in that: The regulating assembly (400) includes a control valve (430), and the control valve (430) is provided on the connecting pipe (600) to connect or disconnect the connecting pipe (600).

8. The battery pack according to claim 7, characterized in that: There is at least one control valve (430).

9. The battery pack according to claim 7, characterized in that: The control valves (430) are arranged on the connecting pipes (600) in a one-to-one correspondence.

10. The battery pack according to claim 7, characterized in that: The connecting pipe (600) includes a first branch pipe (610) and a second branch pipe (620), wherein the first branch pipe (610) connects the restraining member (310) and the liquid storage member (500), and the second branch pipe (620) connects the restraining member (310) and the liquid storage member (500); The control valve (430) includes a first one-way valve (431) and a second one-way valve (432), wherein the first one-way valve (431) is arranged on the first branch pipe (610), and the second one-way valve (432) is arranged on the second branch pipe (620), and the conduction direction of the first one-way valve (431) is opposite to the conduction direction of the second one-way valve (432).

11. The battery pack according to claim 2, wherein: The invention also includes a shell (100), wherein the shell (100) has a connecting portion (110), the liquid storage component (500) is located outside the shell (100), and the connecting portion (110) connects the restraining component (310) and the liquid storage component (500).

12. The battery pack according to any one of claims 1 to 11, characterized in that: The invention also includes a control member (700), wherein the control member (700) is electrically connected to the regulating assembly (400), and the control member (700) controls the regulating assembly (400) to regulate the amount of liquid in the restraining member (310).

13. The battery pack according to any one of claims 1 to 11, characterized in that: The restraining member (310) includes a housing (312), the housing (312) including a first side plate (313) and a second side plate (314) opposite to each other, and at least one of the first side plate (313) and the second side plate (314) abuts against the battery core (210).

14. The battery pack according to claim 13, wherein: The restraining member (310) further includes a plurality of connecting ribs (315), wherein the connecting ribs (315) connect the first side plate (313) and the second side plate (314); The connecting ribs (315) are sequentially spaced apart along the second direction, and the spacing between the connecting ribs (315) gradually decreases from the middle to the two ends of the first side plate (313).

15. The battery pack according to claim 13, wherein: In the third direction, the thickness of the first side plate (313) gradually increases from the middle to both ends of the first side plate (313); And / or, in the third direction, the thickness of the second side plate (314) gradually increases from the middle to both ends of the second side plate (314).

16. The battery pack according to any one of claims 1 to 11, characterized in that: There is one restraining member (310); Alternatively, there are at least two restraining members (310), and the restraining members (310) are interconnected.

17. The battery pack according to any one of claims 1 to 11, characterized in that: It also includes at least one limiting member (800), the limiting member (800) being arranged at one end of the battery cell group (200) in the first direction; The restraining member (310) abuts between the limiting member (800) and the battery core (210), and / or the restraining member (310) abuts between two adjacent battery cores (210).

18. An electrical device, characterized in that: The invention comprises a device body and a battery pack according to any one of claims 1 to 17 arranged on the device body.

19. A vehicle, characterized in that: The invention comprises a vehicle body and a battery pack according to any one of claims 1 to 17 arranged on the vehicle body.

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