Battery module and pressurizing device

Abstract

The invention discloses a battery module and a pressurizing device, the battery module comprises: a shell, a cavity is formed in the shell, the cavity is filled with liquid or gas, the shell is provided with a first through hole, and the first through hole is communicated with the cavity; the mounting bracket is arranged in the cavity; the plurality of battery cells are arranged on the mounting bracket; and the pressure adjusting device is communicated with the first through hole, and the pressure adjusting device is used for adjusting the intensity of pressure in the cavity. According to the technical scheme provided by the invention, the pressure intensity in the cavity can be adjusted in the working process of the battery module, so that the pressure of the battery cell is kept in a balanced state, and the electricity utilization safety of the battery module is ensured.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a battery module and a pressurizing device. Background Art

[0002] Solid-state batteries are an important part of the future battery field. They are still in the research and development stage and will be widely used in the fields of new energy vehicle power batteries and energy storage in the future.

[0003] Due to the characteristics of solid-state batteries themselves, solid-state batteries need to be pressurized during operation, so the solid-state battery module needs to have an independent pressurization device to provide pressure when it is designed.

[0004] Current solid-state battery modules usually use pressure plates to pressurize battery cells, but the pressure plates only apply pressure in one direction and cannot adjust the pressure on the battery cells. During the operation of the solid-state battery module, the battery cells will change in volume, and the pressure inside the solid-state battery module will also fluctuate with the volume change of the battery cells. The change in the volume of the battery cells will cause the pressure on the battery cells to change. Large changes in the pressure on the battery cells will affect the safety of the battery cells' use of electricity.

[0005] At present, there is an urgent need to solve the problem of cell pressure balance in battery modules during operation. Summary of the Invention

[0006] One purpose of the present invention is to provide an improved battery module and pressurizing device.

[0007] According to a first aspect of an embodiment of the present application, a battery module is provided, comprising:

[0008] a housing, wherein a cavity is formed inside the housing, the cavity is filled with liquid or gas, and the housing is provided with a first through hole, the first through hole being in communication with the cavity;

[0009] a mounting bracket, the mounting bracket being disposed in the cavity;

[0010] A plurality of battery cells, wherein the plurality of battery cells are arranged on the mounting bracket;

[0011] A pressure regulating device is connected to the first through hole, and the pressure regulating device is used to adjust the pressure in the cavity.

[0012] Optionally, the pressure regulating device includes a pressure regulating pump, a pressure regulating tank and a valve, the pressure regulating pump is connected to the pressure regulating tank, the pressure regulating tank is connected to the first through hole, and the valve is arranged between the pressure regulating tank and the first through hole.

[0013] Optionally, the housing further includes a second through hole and a third through hole, and the second through hole and the third through hole are both connected to the cavity;

[0014] A second valve is provided at the second through hole, and a third valve is provided at the third through hole.

[0015] Optionally, the housing is filled with insulating liquid; or

[0016] The shell is filled with insulating gas.

[0017] Optionally, the insulating liquid is insulating thermal oil, insulating thermal silicone oil, or fluorinated or halogenated oil.

[0018] Optionally, the housing includes a first portion and a second portion, the first portion is connected to the second portion, and the interior of the first portion and the interior of the second portion form the cavity;

[0019] A first connecting portion is provided on the inner wall of the first portion, a second connecting portion is provided on the side wall of the mounting bracket, and the first connecting portion is connected to the second connecting portion.

[0020] Optionally, the first connecting portion includes a first sub-connecting portion, the first sub-connecting portion includes a first mounting surface, and the first mounting surface faces the width direction of the battery module;

[0021] The second connecting portion includes a second sub-connecting portion, the second sub-connecting portion includes a second mounting surface, and the second mounting surface faces the width direction of the battery module; the first mounting surface and the second mounting surface at least partially overlap.

[0022] Optionally, the first connection portion further includes a third sub-connection portion, the third sub-connection portion includes a third mounting surface, and the third mounting surface faces the height direction of the battery module;

[0023] The second connection portion includes a fourth sub-connection portion, the fourth sub-connection portion includes a fourth mounting surface, and the fourth mounting surface faces the height direction of the battery module; the third mounting surface and the fourth mounting surface at least partially overlap.

[0024] Optionally, the mounting bracket is provided with a plurality of mounting slots, and the battery cells are arranged in the mounting slots;

[0025] The height of the battery core is greater than the height of the mounting groove.

[0026] Optionally, the battery cell includes a first end and a second end, and both the first end and the second end are exposed from the mounting groove.

[0027] Optionally, the plurality of battery cells are connected in series and / or in parallel via a conductive sheet, and the conductive sheet is located outside the mounting slot.

[0028] Optionally, the battery module further includes a battery management system, which is disposed on an outer wall of the shell and is electrically connected to the conductive sheet.

[0029] Optionally, the pressure in the cavity ranges from 0.1 MPa to 10 MPa.

[0030] According to the second aspect of an embodiment of the present application, a pressurizing device is provided, which is used to pressurize the above-mentioned battery module. The pressurizing device includes a pressurizing pump and a pressure storage tank, the pressure storage tank is connected to the pressurizing pump, the pressurizing pump is connected to the second through hole of the battery module, and the pressure storage tank is connected to the third through hole of the battery module.

[0031] Optionally, the interior of the battery module is pressurized to 0.1 MPa-10 MPa by the pressure pump and the pressure storage tank.

[0032] One technical effect of the embodiments of the present application is that, through the pressure regulating device, it is possible to adjust the pressure in the cavity of the battery module during operation so that the pressure of the battery cell remains balanced to ensure the safety of power use of the battery module.

[0033] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0035] Figure 1 Schematic diagram of the structure of the battery module in the embodiment of the present application;

[0036] Figure 2 Schematic diagram of the structure of the battery module in the embodiment of the present application;

[0037] Figure 3 This is a schematic structural diagram of a mounting bracket in an embodiment of the present application;

[0038] Figure 4 This is a schematic structural diagram of a mounting bracket in an embodiment of the present application;

[0039] Figure 5 This is a schematic structural diagram of the mounting bracket and battery cell in an embodiment of the present application;

[0040] Figure 6 This is a schematic structural diagram of the mounting bracket and battery cell in an embodiment of the present application;

[0041] Figure 7This is a schematic structural diagram of the mounting bracket, battery cell and conductive sheet in an embodiment of the present application;

[0042] Figure 8 This is a schematic structural diagram of the housing, voltage regulating device, and battery management system in an embodiment of the present application;

[0043] Figure 9 This is a schematic structural diagram of the housing, voltage regulating device, and battery management system in an embodiment of the present application;

[0044] Figure 10 Schematic diagram of the structure of the pressurizing device and the battery module in the embodiment of the present application.

[0045] Description of the accompanying drawings: housing 1; cavity 11; first inner wall 111; second inner wall 112; third inner wall 113; fourth inner wall 114; first through hole 12; second through hole 13; third through hole 14; first connecting portion 15; first sub-connecting portion 15a; third sub-connecting portion 15b; first connecting plate 151; fifth connecting plate 153; sixth connecting plate 154; ninth connecting plate 155; tenth connecting plate 156; mounting bracket 2; mounting groove 21; first side wall 22; second side wall 23; third side wall 24; fourth side wall 25 ; second connecting part 26; second sub-connecting part 26a; fourth sub-connecting part 26b; third connecting plate 261; seventh connecting plate 263; eighth connecting plate 264; eleventh connecting plate 265; twelfth connecting plate 266; battery cell 3; first end 31; second end 32; pole 33; pressure regulating device 4; pressure regulating pump 41; pressure regulating tank 42; first valve 43; conductive sheet 5; battery management system 6; pressurizing device 7; pressure pump 71; pressure storage tank 72; second valve 73; third valve 74; fourth valve 75; fifth valve 76. DETAILED DESCRIPTION

[0046] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application.

[0047] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0048] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0049] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0050] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0051] like Figure 1-9 As shown, according to the first aspect of an embodiment of the present application, a battery module is provided, including a shell 1, a mounting bracket 2, a plurality of battery cells 3 and a voltage regulating device 4; a cavity 11 is formed inside the shell 1, and the cavity 11 is filled with liquid or gas, and the shell 1 is provided with a first through hole 12, which is connected to the cavity 11; the mounting bracket 2 is arranged in the cavity 11; the plurality of battery cells 3 are arranged on the mounting bracket 2; the voltage regulating device 4 is connected to the first through hole 12, and the voltage regulating device 4 is used to adjust the pressure in the cavity 11.

[0052] like Figure 1 and Figure 2 As shown, the battery module includes a shell 1, a mounting bracket 2, a plurality of battery cells 3 and a voltage regulating device 4; wherein, a cavity 11 is formed inside the shell 1, and the cavity 11 is in a sealed state. A first through hole 12 is opened on the shell 1, and the first through hole 12 is connected to the cavity 11. It can be understood that the first through hole 12 connects the outside of the shell 1 and the inside of the shell 1; the plurality of battery cells 3 are arranged on the mounting bracket 2, and the mounting bracket 2 provides an installation support for the battery cells 3; the mounting bracket 2 is arranged in the cavity 11, so the battery cells 3 are located in the cavity 11, and the cavity 11 is filled with liquid or gas, and the battery cells 3 located in the cavity 11 are pressurized by the filled liquid or gas.

[0053] To further illustrate, the pressure regulating device 4 is connected to the first through hole 12 , and the pressure regulating device 4 adjusts the pressure of the liquid or gas in the cavity 11 through the first through hole 12 , so as to ensure that the pressure of the battery cell 3 remains balanced during the operation of the battery module.

[0054] The battery module of the present application can solve the problem of adjusting the pressure in the cavity 11 during the operation of the battery module through the pressure regulating device 4, so that the pressure of the battery cell 3 remains balanced to ensure the safety of the battery module.

[0055] Among them, compared with the prior art of pressurizing the battery cell by a pressure plate, the present application pressurizes the battery cell 3 by liquid or gas, which can evenly apply the same pressure to each battery cell 3 in all directions in the shell 1, and use the pressure regulating device 4 to dynamically adjust the pressure of the battery module during the charging and discharging process, ensuring the balance of the pressure of the battery cell 3 during use, so as to ensure the safety of the battery module's electricity use.

[0056] In an optional embodiment, the pressure regulating device 4 includes a pressure regulating pump 41, a pressure regulating tank 42 and a first valve 43, the pressure regulating pump 41 is connected to the pressure regulating tank 42, the pressure regulating tank 42 is connected to the first through hole 12, and the first valve 43 is arranged between the pressure regulating tank 42 and the first through hole 12.

[0057] like Figure 1 and Figure 2 As shown, the pressure regulating device 4 includes a pressure regulating pump 41, a pressure regulating tank 42 and a first valve 43. The pressure regulating pump 41 is connected to the pressure regulating tank 42 through a pipeline, and the pressure regulating tank 42 is connected to the first through hole 12 through a pipeline. The first valve 43 is arranged between the first through hole 12 and the pressure regulating tank 42; the pressure regulating tank 42 is used to store gas or liquid; when it is necessary to pressurize the cavity 11, the first valve 43 is opened, the pressure regulating tank 42 is connected to the first through hole 12, and the pressure regulating pump 41 fills the gas or liquid in the pressure regulating tank 42 The pressure in the cavity 11 is filled with liquid, thereby pressurizing the cavity 11. When the pressure in the cavity 11 needs to be reduced, the first valve 43 is opened, the pressure regulating tank 42 is connected to the first through hole 12, and the pressure regulating pump 41 returns the gas or liquid in the cavity 11 to the pressure regulating tank 42, thereby reducing the pressure in the cavity 11. Therefore, the pressure regulating pump 41, the pressure regulating tank 42 and the first valve 43 can achieve positive or negative compensation of the pressure in the cavity 11, ensuring that the pressure in the cavity 11 is relatively balanced within a certain range. In this embodiment, the pressure regulating device 4 has a simple structure, is easy to install, and has a low cost.

[0058] The pressure regulating pump 41 may be a hydraulic cylinder or a motor.

[0059] In an alternative embodiment, Figure 1 As shown, the shell 1 also includes a second through hole 13 and a third through hole 14, and the second through hole 13 and the third through hole 14 are both connected to the cavity 11; a second valve 73 is provided at the second through hole 13, and a third valve 74 is provided at the third through hole 14; wherein, the second through hole 13 and the third through hole 14 are used to connect to the external pressurizing device 7; the second through hole 13 is an outlet, and the third through hole 14 is an inlet, for filling or discharging liquid or gas into the cavity 11.

[0060] To further explain, the second valve 73 is used to control the connection and disconnection between the second through hole 13 and the cavity 11 , and the third valve 74 is used to control the connection and disconnection between the third through hole 14 and the cavity 11 .

[0061] In an optional embodiment, the liquid filled in the shell 1 is an insulating liquid; or the gas filled in the shell 1 is an insulating gas.

[0062] To further explain, since the battery core 3 is disposed in the cavity 11 , in order to prevent the battery core 3 from short-circuiting, an insulating liquid or gas is used, and the filled liquid or gas can short-circuit with the battery core 3 .

[0063] In an optional embodiment, the insulating liquid is insulating thermal oil, insulating thermal silicone oil, or fluorinated or halogenated oil. In addition to pressurizing and insulating the cavity 11, the insulating liquid also provides heat conduction and flame retardancy, thereby improving the electrical safety of the battery module.

[0064] In an optional embodiment, the shell 1 includes a first part and a second part, the first part is connected to the second part, and the interior of the first part and the interior of the second part form the cavity 11; a first connecting part 15 is provided on the inner wall of the interior of the first part, and a second connecting part 26 is provided on the side wall of the mounting bracket 2, and the first connecting part 15 is connected to the second connecting part 26.

[0065] like Figure 1 As shown, the housing 1 includes a first portion and a second portion. In one embodiment, a first sub-cavity is formed inside the first portion, and the second portion is snapped onto the first portion. The first portion seals the first sub-cavity, and the first sub-cavity is cavity 11. In another embodiment, a first sub-cavity is formed inside the first portion, and a second sub-cavity is formed inside the second portion. The second portion is snapped onto the first portion, and the first sub-cavity and the second sub-cavity are connected. The first sub-cavity and the second sub-cavity together form cavity 11.

[0066] Further explanation, such as Figure 1 and Figure 2 As shown, a first connecting portion 15 is provided on the inner wall of the first part, that is, a first connecting portion 15 is provided on the inner wall of the first sub-cavity; the mounting bracket 2 includes a side wall, and a second connecting portion 26 is provided on the side wall of the mounting bracket 2. The first connecting portion 15 is connected to the second connecting portion 26, thereby fixing the mounting bracket 2 in the cavity 11.

[0067] There is a gap between the side wall of the mounting bracket 2 and the inner wall of the first sub-cavity for filling with liquid or gas.

[0068] In a specific embodiment, the first connecting portion 15 includes a first sub-connecting portion 15a, the first sub-connecting portion 15a includes a first mounting surface, and the first mounting surface faces the width direction of the battery module; the second connecting portion 26 includes a second sub-connecting portion 26a, the second sub-connecting portion 26a includes a second mounting surface, and the second mounting surface faces the width direction of the battery module; the first mounting surface and the second mounting surface at least partially overlap.

[0069] Further explanation, such as Figure 1 and Figure 2 As shown, the first sub-connecting portion 15a is arranged on the inner wall of the shell 1, the second sub-connecting portion 26a is arranged on the mounting bracket 2, the mounting bracket 2 is arranged inside the shell 1, and the first sub-connecting portion 15a is connected to the second sub-connecting portion 26a to fix the mounting bracket 2 inside the shell 1.

[0070] The first sub-connection portion 15a includes a first mounting surface, and the second sub-connection portion 26a includes a second mounting surface. Both the first mounting surface and the second mounting surface face the width direction of the battery module (see the attached diagram for the width direction of the battery module). Figure 1 Therefore, the first sub-connection portion 15a can provide a supporting force in the width direction for the second sub-connection portion 26a to limit the movement of the mounting bracket 2 in the width direction.

[0071] Specifically, if Figure 8 and Figure 9 As shown, the inner wall of the housing 1 includes a first inner wall 111 and a second inner wall 112. The first inner wall 111 and the second inner wall 112 are arranged opposite to each other, that is, the first inner wall 111 and the second inner wall 112 are arranged opposite to each other along the width direction of the battery module (please refer to the attached diagram for the width direction of the battery module). Figure 8 direction marked); Figure 5 and Figure 4 As shown, the side walls of the mounting bracket 2 include a first side wall 22 and a second side wall 23. The first side wall 22 and the second side wall 23 are arranged relatively to each other along the width direction of the battery module. The first side wall 22 is closer to the first inner wall 111 relative to the second side wall 23, and the second side wall 23 is closer to the second inner wall 112 relative to the first side wall 22.

[0072] Further explanation, such as Figure 4 、 Figure 5 、 Figure 8 and Figure 9 As shown, the first sub-connecting portion 15a includes a first connecting plate 151 and a second connecting plate (not shown in the figure, refer to the first connecting plate 151), the first connecting plate 151 is arranged on the first inner wall 111, and the first mounting surface of the first connecting plate 151 faces the width direction, the second connecting plate is arranged on the second inner wall 112, and the first mounting surface of the second connecting plate faces the width direction; the second sub-connecting portion 26a includes a third connecting plate 261 and a fourth connecting plate (not shown in the figure, refer to the third connecting plate 261), the third connecting plate 261 is arranged on the first side wall 22, and the second mounting surface of the third connecting plate 261 faces the width direction, the fourth mounting plate is arranged on the second side wall 23, and the second mounting surface of the fourth mounting plate faces the width direction.

[0073] To further illustrate, the first connecting plate 151 is connected to the third connecting plate 261, that is, the first mounting surface of the first connecting plate 151 and the second mounting surface of the second connecting plate at least partially overlap in the width direction, and the first connecting plate 151 and the second connecting plate can be connected by bolts or welding; the second connecting plate is connected to the fourth connecting plate, that is, the first mounting surface of the second connecting plate and the second mounting surface of the fourth connecting plate at least partially overlap in the width direction, and the second connecting plate and the fourth connecting plate can be connected by bolts or welding.

[0074] In a specific embodiment, the first connecting portion 15 also includes a third sub-connecting portion 15b, the third sub-connecting portion 15b includes a third mounting surface, and the third mounting surface faces the height direction of the battery module; the second connecting portion 26 includes a fourth sub-connecting portion 26b, the fourth sub-connecting portion 26b includes a fourth mounting surface, and the fourth mounting surface faces the height direction of the battery module; the third mounting surface and the fourth mounting surface at least partially overlap.

[0075] Further explained, the third sub-connection portion 15b is arranged on the inner wall of the shell 1, the fourth sub-connection portion 26b is arranged on the mounting bracket 2, the mounting bracket 2 is arranged inside the shell 1, and the third sub-connection portion 15b and the fourth sub-connection portion 26b are connected to fix the mounting bracket 2 inside the shell 1.

[0076] The third sub-connection portion 15b includes a third mounting surface, and the fourth sub-connection portion 26b includes a fourth mounting surface. Both the third mounting surface and the fourth mounting surface face the height direction of the battery module (for the height direction of the battery module, please refer to the attached FIG. Figure 9 Therefore, the third sub-connection portion 15b can provide a supporting force in the height direction for the fourth sub-connection portion 26b to limit the movement of the mounting bracket 2 in the height direction.

[0077] The first sub-connection portion 15a is connected to the second sub-connection portion 26a, and the third sub-connection portion 15b is connected to the fourth sub-connection portion 26b. The first sub-connection portion 15a and the third sub-connection portion 15b work together to provide a more stable support for the mounting bracket 2.

[0078] like Figure 8 and Figure 9 As shown, the inner wall of the housing 1 further includes a third inner wall 113 and a fourth inner wall 114. The third inner wall 113 and the fourth inner wall 114 are arranged opposite to each other. It can be understood that the third inner wall 113 and the fourth inner wall 114 are arranged opposite to each other along the length direction of the battery module (please refer to the attached diagram for the length direction of the battery module). Figure 8 and Figure 9the first inner wall 111, the third inner wall 113, the second inner wall 112, and the fourth inner wall 114 are connected in sequence, and the first inner wall 111 is connected to the fourth inner wall 114, thereby forming the inner wall of the shell 1.

[0079] like Figure 3 and Figure 4 As shown, the side walls of the mounting bracket 2 also include a third side wall 24 and a fourth side wall 25. The third side wall 24 and the fourth side wall 25 are arranged relative to each other. It can be understood that the third side wall 24 and the fourth side wall 25 are arranged relative to each other along the length direction of the battery module; the first side wall 22, the third side wall 24, the second side wall 23, and the fourth side wall 25 are connected in sequence, and the first side wall 22 is connected to the fourth side wall 25, thereby forming the side walls of the mounting bracket 2; and the third side wall 24 is closer to the third inner wall 113 than the fourth side wall 25, and the fourth side wall 25 is closer to the fourth side wall 25 than the third side wall 24.

[0080] Further explanation, such as Figure 4 、 Figure 5 、 Figure 8 and Figure 9 As shown, the third sub-connection part 15b also includes a fifth connecting plate 153 and a sixth connecting plate 154, the fifth connecting plate 153 is arranged on the third inner wall 113, and the third mounting surface of the fifth connecting plate 153 is facing the height direction of the battery module, the sixth connecting plate 154 is arranged on the fourth inner wall 114, and the third mounting surface of the sixth connecting plate 154 is facing the height direction of the battery module; the fourth sub-connection part 26b also includes a seventh connecting plate 263 and an eighth connecting plate 264, the seventh connecting plate 263 is arranged on the third side wall 24, and the fourth mounting surface of the seventh connecting plate 263 is facing the height direction of the battery module, the eighth connecting plate 264 is arranged on the fourth side wall 25, and the fourth mounting surface of the eighth connecting plate 264 is facing the height direction of the battery module.

[0081] To further illustrate, the fifth connecting plate 153 is connected to the seventh connecting plate 263, that is, the third mounting surface of the fifth connecting plate 153 and the fourth mounting surface of the seventh connecting plate 263 at least partially overlap in the height direction, and the fifth connecting plate 153 and the seventh connecting plate 263 can be connected by bolts or welding; the sixth connecting plate 154 is connected to the eighth connecting plate 264, that is, the third mounting surface of the sixth connecting plate 154 and the fourth mounting surface of the eighth connecting plate 264 at least partially overlap in the height direction, and the sixth connecting plate 154 and the eighth connecting plate 264 can be connected by bolts or welding.

[0082] Further explanation, the third sub-connection part 15b also includes a ninth connecting plate 155 and a tenth connecting plate 156, the ninth connecting plate 155 is arranged on the first inner wall 111, and the third mounting surface of the ninth connecting plate 155 faces the height direction, the tenth connecting plate 156 is arranged on the second inner wall 112, and the third mounting seat of the tenth connecting plate 156 faces the height direction; the fourth sub-connection part 26b also includes an eleventh connecting plate 265 and a twelfth connecting plate 266, the tenth connecting plate 156 is arranged on the first side wall 22, the fourth mounting surface of the eleventh connecting plate 265 faces the height direction, the twelfth connecting plate 266 is arranged on the second side wall 23, and the fourth mounting surface of the twelfth connecting plate 266 faces the height direction.

[0083] It is further explained that the ninth connecting plate 155 is connected to the eleventh connecting plate 265, that is, the third mounting surface of the ninth connecting plate 155 and the fourth mounting surface of the eleventh connecting plate 265 at least partially overlap in the height direction, and can be connected by bolts or welding; the tenth connecting plate 156 is connected to the twelfth connecting plate 266, that is, the third mounting surface of the tenth connecting plate 156 and the fourth mounting surface of the twelfth connecting plate 266 at least partially overlap in the height direction, and can be connected by bolts or welding.

[0084] In an optional embodiment, the mounting bracket 2 is provided with a plurality of mounting grooves 21 , the battery cells 3 are arranged in the mounting grooves 21 , and the height of the battery cells 3 is greater than the height of the mounting grooves 21 .

[0085] like Figure 5 As shown, the mounting bracket 2 is provided with a plurality of mounting slots 21, and the plurality of mounting slots 21 are evenly distributed, and a plurality of battery cells 3 are arranged in the plurality of mounting slots 21; wherein, one battery cell 3 can be arranged in one mounting slot 21, or two or more battery cells 3 can be arranged in one mounting slot 21; the above two situations can be selected according to actual needs.

[0086] To further illustrate, the height of the battery cell 3 is greater than the height of the mounting groove 21, wherein the height direction of the battery cell 3 is the same as the height direction of the battery module, and the height direction of the mounting groove 21 is the same as the height direction of the battery module; specifically, the battery cell 3 is placed in the mounting groove 21, and the height of the battery cell 3 is greater than the height of the mounting groove 21, so the battery cell 3 will be partially exposed in the mounting groove 21. It can be understood that the battery cell 3 will be partially located in the cavity 11, and the cavity 11 is filled with gas or liquid. The gas or liquid will pressurize the battery cell 3, thereby ensuring that the battery cell 3 is in a pressurized environment.

[0087] In an optional embodiment, the battery core 3 includes a first end 31 and a second end 32 , and both the first end 31 and the second end 32 are exposed from the mounting groove 21 .

[0088] like Figure 6 As shown, the mounting groove 21 is a through groove in the height direction. When the battery cell 3 is located in the mounting groove 21, the first end 31 is located above the mounting groove 21 in the height direction, and the second end 32 is located below the mounting groove 21 in the height direction; therefore, the first end 31 and the second end 32 are both located in the cavity 11, and the gas or liquid will pressurize the battery cell 3, thereby ensuring that the pressure on the single battery cell 3 is more uniform.

[0089] In an optional embodiment, the plurality of battery cells 3 are connected in series and / or in parallel via a conductive sheet 5 , and the connecting portion is located outside the mounting groove 21 .

[0090] Specifically, if Figure 7 As shown, the battery cell 3 includes a pole 33, which is located at the first end 31, that is, the pole 33 is located outside the mounting groove 21. The multiple battery cells 3 are connected in series or in parallel via a conductive sheet 5 to achieve electrical connection between the multiple battery cells 3. The conductive sheet 5 is connected to the pole 33 of the battery cell 3, so the conductive sheet 5 is located outside the mounting groove 21. The liquid or gas is an insulating liquid or insulating liquid, so it does not cause a short circuit between the multiple battery cells 3.

[0091] In an optional embodiment, the battery module further includes a battery management system 6 , which is disposed on an outer wall of the housing 1 , and is electrically connected to the conductive sheet 5 .

[0092] Further explanation, such as Figure 1 and Figure 2 As shown, the battery management system 6 is located outside the shell 1. The battery management system 6 is electrically connected to the conductive sheet 5 through a wire. The battery management system 6 is a device that cooperates with monitoring the status of the energy storage battery module. It is mainly for intelligent management and maintenance of each battery unit, preventing the battery module from overcharging and over-discharging, thereby extending the service life of the battery module and monitoring the status of the battery module.

[0093] In one embodiment, the pressure range in the cavity 11 is 0.1 MPa-10 MPa. Controlling the pressure range in the cavity 11 between 0.1 MPa-10 MPa can continuously and evenly apply pressure to the battery cell 3 .

[0094] Preferably, the pressure in the cavity 11 is in the range of 0.16 MPa-5 MPa. Within this range, the problem of squeezing the battery cell 3 due to excessive pressure or being unable to control the volume change of the battery cell 3 due to too low pressure can be avoided.

[0095] According to the second aspect of the embodiment of the present application, a pressurizing device 7 is provided, which is used to pressurize the above-mentioned battery module. The pressurizing device 7 includes a pressurizing pump 71 and a pressure storage tank 72; the pressure storage tank 72 is connected to the pressurizing pump 71; the pressurizing pump 71 is connected to the second through hole 13 of the battery module, and the pressure storage tank 72 is connected to the third through hole 14 of the battery module.

[0096] Further explanation, such as Figure 10 As shown, the pressure storage tank 72 is connected to the third through hole 14 through a pipeline, the pressure pump 71 is connected to the second through hole 13 through a pipeline, and the pressure pump 71 is connected to the pressure storage tank 72. The pressure storage tank 72 is used to store the liquid or gas that needs to be filled into the cavity 11; after the pressurization is completed, the second valve 73 and the third valve 74 are closed to maintain the pressure in the cavity 11, and the pressurizing device 7 can be disassembled from the battery module; during the regular maintenance of the battery module, the pressurizing device 7 can be reconnected to adjust the pressure in the cavity 11.

[0097] If the cavity 11 is filled with liquid, the gas in the cavity 11 will be discharged through the second through hole 13 so that the filled liquid can be immersed in the cavity 11 .

[0098] In a preferred embodiment, the pressurizing device 7 further includes a fourth valve 75 and a fifth valve 76 . The fourth valve 75 is disposed between the pressurizing pump 71 and the second through hole 13 , and the fifth valve 76 is disposed between the pressure storage tank 72 and the third through hole 14 .

[0099] In an optional embodiment, the interior of the battery module is pressurized to 0.1Mpa-10Mpa by the pressure pump 71 and the pressure storage tank 72; the gas or liquid in the pressure storage tank 72 is filled into the cavity 11 by the pressure pump 71, so that the pressure range inside the battery module is controlled between 0.11Mpa-10MPa, so that the filled liquid or gas can continuously apply uniform pressure to the battery cell 3.

[0100] Preferably, the gas or liquid in the pressure storage tank 72 is filled into the cavity 11 by the pressure pump 71 so that the pressure range inside the battery module is controlled between 0.16 MPa and 5 MPa, which can avoid the problem of squeezing the battery cell 3 due to excessive pressure or the problem of being unable to control the volume change of the battery cell 3 due to too low pressure.

[0101] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A battery module, characterized in that: include: a housing, wherein a cavity is formed inside the housing, the cavity is filled with liquid or gas, and the housing is provided with a first through hole, the first through hole being in communication with the cavity; a mounting bracket, the mounting bracket being disposed in the cavity; A plurality of battery cells, wherein the plurality of battery cells are arranged on the mounting bracket; A pressure regulating device is connected to the first through hole, and the pressure regulating device is used to adjust the pressure in the cavity.

2. The battery module according to claim 1, wherein: The pressure regulating device includes a pressure regulating pump, a pressure regulating tank and a valve. The pressure regulating pump is connected to the pressure regulating tank, the pressure regulating tank is connected to the first through hole, and the valve is arranged between the pressure regulating tank and the first through hole.

3. The battery module according to claim 1, wherein: The housing further includes a second through hole and a third through hole, wherein the second through hole and the third through hole are both connected to the cavity; A second valve is provided at the second through hole, and a third valve is provided at the third through hole.

4. The battery module according to claim 1, wherein: The housing is filled with insulating liquid; or The shell is filled with insulating gas.

5. The battery module according to claim 4, characterized in that: The insulating liquid is insulating heat-conducting oil, insulating heat-conducting silicone oil or fluorinated or halogenated oil.

6. The battery module according to claim 1, characterized in that: The housing includes a first portion and a second portion, the first portion is connected to the second portion, and the interior of the first portion and the interior of the second portion form the cavity; A first connecting portion is provided on the inner wall of the first portion, a second connecting portion is provided on the side wall of the mounting bracket, and the first connecting portion is connected to the second connecting portion.

7. The battery module according to claim 6, characterized in that: The first connecting portion includes a first sub-connecting portion, the first sub-connecting portion includes a first mounting surface, and the first mounting surface faces the width direction of the battery module; The second connecting portion includes a second sub-connecting portion, the second sub-connecting portion includes a second mounting surface, and the second mounting surface faces the width direction of the battery module; the first mounting surface and the second mounting surface at least partially overlap.

8. The battery module according to claim 6, characterized in that: The first connection portion further includes a third sub-connection portion, the third sub-connection portion includes a third mounting surface, and the third mounting surface faces the height direction of the battery module; The second connection portion includes a fourth sub-connection portion, the fourth sub-connection portion includes a fourth mounting surface, and the fourth mounting surface faces the height direction of the battery module; the third mounting surface and the fourth mounting surface at least partially overlap.

9. The battery module according to claim 1, wherein: The mounting bracket is provided with a plurality of mounting slots, and the battery cells are arranged in the mounting slots; The height of the battery core is greater than the height of the mounting groove.

10. The battery module according to claim 9, characterized in that: The battery cell includes a first end and a second end, and the first end and the second end are both exposed from the mounting groove.

11. The battery module according to claim 9, characterized in that: The multiple battery cells are connected in series and / or in parallel via conductive sheets, and the conductive sheets are located outside the mounting slots.

12. The battery module according to claim 11, characterized in that: The battery module further includes a battery management system, which is disposed on an outer wall of the shell and is electrically connected to the conductive sheet.

13. The battery module according to claim 1, wherein: The pressure in the cavity ranges from 0.1 MPa to 10 MPa.

14. A pressurizing device, characterized in that: The pressurizing device is used to pressurize the battery module as described in claims 1-13, and the pressurizing device includes a pressurizing pump and a pressure storage tank, the pressure storage tank is connected to the pressurizing pump, the pressurizing pump is connected to the second through hole of the battery module, and the pressure storage tank is connected to the third through hole of the battery module.

15. The pressurizing device according to claim 14, characterized in that The pressure inside the battery module is pressurized to 0.1 MPa-10 MPa by the pressure pump and the pressure storage tank.

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