Battery pack, vehicle, and control method of battery pack

Abstract

The application relates to the technical field of battery packs, in particular to a battery pack, a vehicle and a control method of the battery pack, which comprises a shell provided with a containing cavity; a plurality of cell modules arranged in the containing cavity, wherein the cell module comprises a plurality of cells arranged in a first direction in a stacked mode, and the plurality of cell modules are arranged in a second direction; and an execution module comprising an air duct, an air inlet valve, an air outlet valve and a plurality of execution parts, wherein the plurality of execution parts are in communication with the air duct, the plurality of execution parts are arranged in the second direction at intervals, the plurality of execution parts are correspondingly abutted on the plurality of cell modules, the execution part is movable in the first direction, the execution module has a first state and a second state, the air inlet valve and the air outlet valve are both closed in the first state, the air inlet valve and the air outlet valve are both opened in the second state, the gas in the air duct flows into the containing cavity through the air inlet valve, and the gas in the containing cavity flows into the air duct through the air outlet valve. The battery pack can not only apply pressure to the cells, but also can directionally discharge the gas in the containing cavity.

Description

Technical Field

[0001] This invention relates to the field of battery pack technology, and more specifically to a battery pack, a vehicle, and a control method for the battery pack. Background Technology

[0002] In related technologies, battery packs contain battery modules. During charging and discharging, the volume of the battery modules changes. To ensure the normal operation of the battery modules, a certain pre-pressure needs to be applied to them. Battery packs typically use elastic buffers to abut against the battery modules. These elastic buffers absorb and buffer the volume changes of the battery modules during charging and discharging and apply pre-pressure to them. Alternatively, battery packs may use push plates to apply pre-pressure to the cells. These push plates can move with the volume changes of the cells to ensure the stability of the cell interface. However, push plates or elastic buffers abut against multiple battery modules simultaneously. The volume changes of multiple battery modules during charging and discharging may not be consistent, making it difficult to apply pre-pressure to the volume changes of a single battery module.

[0003] In addition, when the battery module malfunctions, it may produce harmful gases. Battery packs are usually equipped with explosion-proof valves to discharge harmful gases. However, this leaves a lot of harmful gases inside the battery pack, and the harmful gases emitted by the explosion-proof valves can spread to the surrounding areas of the battery pack, posing a significant safety hazard. Summary of the Invention

[0004] One objective of this invention is to provide a battery pack that solves the problems in the prior art where it is difficult to apply pre-pressure to the volume changes of a single battery module and the diffusion of harmful gases when the battery module malfunctions; a second objective is to provide a vehicle; and a third objective is to provide a control method for the battery pack.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A battery pack includes: a housing having a receiving cavity; multiple battery cell modules disposed within the receiving cavity, each battery cell module comprising multiple battery cells stacked along a first direction, the multiple battery cell modules being arranged along a second direction, the first direction and the second direction intersecting; and an execution module including an air passage, an inlet valve, an outlet valve, and multiple execution parts, the air passage being connected to the housing, the multiple execution parts being communicated with the air passage, the multiple execution parts being spaced apart along the second direction, the multiple execution parts correspondingly abutting against the multiple battery cell modules, each execution part being movable along the first direction, the execution module having a first state and a second state, in the first state, both the inlet valve and the outlet valve being closed, and in the second state, both the inlet valve and the outlet valve being open, gas in the air passage flowing into the receiving cavity through the inlet valve, and gas in the receiving cavity flowing into the air passage through the outlet valve and then being discharged.

[0007] According to the above technical means, during battery pack charging, the thickness of the battery cell increases, and the size of the battery cell module along the first direction increases. The battery cell module pushes the actuator to contract along the first direction. During battery pack discharging, the thickness of the battery cell decreases, and the size of the battery cell module along the first direction decreases. The air pressure in the air passage drives the actuator to extend, so that the actuator continuously applies pressure to the battery cell module. On the one hand, the pressure on the battery cell is always kept within a preset range. On the other hand, the actuator expands and contracts with the size change of the battery cell module, reserving space for changes in the volume of the battery cell and reducing the probability of battery cell damage. In the event of a side collision or crush of the vehicle, the housing may indent into the cavity and apply pressure to the battery cell. At this time, the battery cell can squeeze the actuator, and the actuator contracts along the first direction to absorb the size of the housing intruding into the cavity, avoiding excessive force on the battery cell and reducing the risk of thermal runaway. In addition, the actuator module can be connected to multiple actuators simultaneously by setting air passages. Each actuator can correspond to a single battery cell module. The actuator expands and contracts according to the corresponding battery cell module. The pre-pressure on the battery cell module is more in line with the working requirements, improving the working efficiency of the battery cell module. When the battery pack malfunctions, harmful gases may be generated inside. In this situation, both the inlet and outlet valves can be opened. Gas in the air passage flows into the containment chamber through the inlet valve, while harmful gases in the containment chamber enter the air passage through the outlet valve and flow out of the battery pack along the air passage. This flow of harmful gases along the air passage helps to concentrate and treat them, reducing the hazards caused by their diffusion. Furthermore, the actuator is not driven by the air pressure in the air passage to stop applying pressure to the battery cell module, preventing secondary damage to the battery cell module due to pressure.

[0008] Furthermore, the air passage includes a first section, a second section, and a third section connected in sequence. The air inlet valve is located between the first section and the second section, and the air outlet valve is located between the first section and the second section. The end of the first section away from the second section forms an air inlet end, and the end of the third section away from the second section forms an air outlet end. The first state includes a first sub-state and a second sub-state. In the first sub-state, the first section and the second section are connected. In the second sub-state, the second section and the third section are connected. In the second state, the first section and the third section are connected through the air inlet valve, the receiving cavity, and the air outlet valve.

[0009] Based on the above technical means, when the battery cell is working normally, the actuator module can control the increase and decrease of the air pressure in the air passage, so as to realize the dynamic adjustment of the pressure applied by the actuator to multiple battery cells.

[0010] Furthermore, the execution module also includes a purification component, which is disposed in the third section and is used to purify the gas flowing out of the receiving cavity through the gas outlet.

[0011] Based on the above technical means, during normal operation of the battery pack, the gas in the air duct flows normally through the space inside the purification component, and the normal gas has little impact on the purification component and will not affect the subsequent purification of harmful gases by the purification component; when the battery pack malfunctions, the harmful gas in the containment cavity enters the air duct through the exhaust valve, and then flows through the purification component. The harmful components in the harmful gas will be decomposed or adsorbed by the purification component, and the gas discharged from the air duct contains no harmful components or very few harmful components, further preventing the harmful gas from spreading to the environment around the battery pack and improving safety.

[0012] Furthermore, the battery cell module further includes: a first end plate, which is connected to the housing, and is located on the same side of the plurality of battery cells in the first direction, and has a through hole; a slider, which is disposed between the first end plate and the battery cells, and is movable along the first direction, and has a guide protrusion that passes through the through hole, and the actuator abuts against the guide protrusion to drive the slider to move along the first direction.

[0013] According to the above technical means, the slider and the execution module are located on opposite sides of the first end plate. The guide protrusion of the slider passes through the through hole to abut against the execution part to transmit force. The first end plate can guide the movement of the guide protrusion, thereby ensuring that the slider moves along the first direction so that the battery cell mainly bears the pressure along the first direction, ensuring the uniformity of the force on the battery cell, avoiding damage due to uneven force on the battery cell, extending the service life of the battery cell, and reducing the risk of thermal runaway of the battery cell.

[0014] Furthermore, the guide protrusion has a positioning groove at one end facing the actuator, and the actuator is inserted into the positioning groove.

[0015] Based on the above technical means, it is beneficial to fix the relative position between the guide protrusion and the actuator, avoid relative deflection between the guide protrusion and the actuator, so as to ensure that the thrust applied by the actuator to the guide protrusion acts directly on the battery cell along the thickness direction of the battery cell, ensure the uniformity of the force on the battery cell, and improve the transmission reliability between the actuator and the slider.

[0016] Furthermore, the guide protrusion forms a fixed sidewall along the circumference of the positioning groove, the fixed sidewall is provided with a first fixing hole, the actuating part is provided with a second fixing hole, and both the first fixing hole and the second fixing hole extend radially along the positioning groove; the battery pack also includes a fixing member, which passes through the first fixing hole and the second fixing hole.

[0017] According to the above-mentioned technical means, by inserting the fastener through the first fixing hole and the second fixing hole, the relative position of the guide protrusion and the actuator in the axial direction of the positioning groove can be fixed, and the slider and the actuator move synchronously in the first direction, thereby reducing kinetic energy waste and improving force transmission efficiency.

[0018] Furthermore, the cell module also includes a second end plate, the first end plate and the second end plate are located on opposite sides of the plurality of cells in the first direction, and both the first end plate and the second end plate are connected to the housing.

[0019] According to the above technical means, the second end plate cooperates with the first end plate to fix the opposite sides of multiple cells from the first direction, reducing the probability of cell shaking. In addition, the second end plate can withstand the pressure of multiple cells, and the pressure of the cell module will not be directly transmitted to the cavity sidewall, which helps to ensure the shape of the cavity sidewall, thereby extending the service life and working performance of the battery pack.

[0020] Furthermore, the housing forms a cavity sidewall along the circumference of the receiving cavity, and the cavity sidewall has an opening on the side facing the receiving cavity; the air passage, the actuator, and the air inlet valve are disposed inside the cavity sidewall, and a plurality of actuators pass through a plurality of the openings.

[0021] Based on the above technical means, by utilizing the cavity sidewall to accommodate part of the execution module, the volume of the execution module located outside the housing is reduced, which will not cause the overall volume of the battery pack to increase excessively. Furthermore, the space occupied by the execution module in the cavity is reduced, which is conducive to increasing the volume of the cell module and thus increasing the energy density of the battery pack.

[0022] Furthermore, the housing includes: a base; a frame connected to the base, the frame being arranged circumferentially around the base; a cover plate connected to the side of the frame facing away from the base; and a partition beam connected between the base and the cover plate, the base, the frame, the cover plate, and the partition beam forming at least one of the receiving cavities, the frame and the partition beam forming the cavity sidewalls.

[0023] Based on the aforementioned technical means, the battery pack can be constructed in a variety of ways. The position of the execution module on the housing can be changed according to the usage requirements, which helps to improve the applicability of the battery pack and expand its application range.

[0024] A vehicle comprising the aforementioned battery pack.

[0025] Based on the aforementioned technical means, the vehicle can improve its safety by utilizing the aforementioned battery pack.

[0026] A method for controlling a battery pack includes: determining whether a battery cell is malfunctioning; if so, controlling both the inlet and outlet valves of an execution module to open, allowing gas in the air passage of the execution module to enter the housing cavity through the inlet valve, thereby driving the gas in the housing cavity to be discharged through the outlet valve; if not, controlling both the inlet and outlet valves to close, controlling the entry or exit of gas in the air passage to adjust the position of the execution unit, thereby maintaining the battery cell pressure in the battery cell module within a preset range.

[0027] According to the above-mentioned technical means, when the battery pack malfunctions, harmful gases may be generated inside the battery pack. For example, when the battery cell is a sulfide solid-state battery, a malfunction in the sulfide solid-state battery may generate hydrogen sulfide gas. At this time, both the inlet valve and the outlet valve can be opened. The gas in the gas passage flows into the receiving cavity through the inlet valve, and the harmful gas in the receiving cavity enters the gas passage through the outlet valve and flows out of the battery pack along the gas passage. At this time, the harmful gas flows along the gas passage, instead of diffusing at the explosion-proof valve as in the prior art. This is beneficial for the centralized treatment of harmful gases and reduces the harm caused by the diffusion of harmful gases. Furthermore, at this time, the actuator is not driven by the gas pressure in the gas passage and stops applying pressure to the cell module, avoiding the problem of secondary damage to the cell module due to pressure. When the battery pack is working normally, the actuator can be used to apply pressure to the cell module to maintain the cell pressure within the cell module within a preset range, ensuring the working efficiency of the cell.

[0028] Furthermore, the battery pack control method also includes: after determining that the battery cell is malfunctioning; obtaining the pressure value of the battery cell; if the pressure value is less than or equal to a first preset value, controlling the gas in the air passage to enter or exit to adjust the position of the actuator, so as to maintain the battery cell pressure in the battery cell module within a preset range; if the pressure value is greater than the first preset value and less than or equal to a second preset value, controlling the gas in the air passage to enter or exit to adjust the position of the actuator, so as to maintain the battery cell pressure in the battery cell module within a preset range, until the actuator moves to the limit position, controlling the air passage to stop air intake and start air exhaust; if the pressure value is greater than the second preset value, controlling the air passage to stop air intake and start air exhaust.

[0029] Based on the above-mentioned technical means, the battery pack is safer under collision or compression conditions.

[0030] The beneficial effects of this invention are:

[0031] (1) When the battery pack is charging, the thickness of the battery cell increases, the size of the battery cell module along the first direction increases, and the battery cell module pushes the actuator to contract along the first direction; when the battery pack is discharging, the thickness of the battery cell decreases, the size of the battery cell module along the first direction decreases, and the air pressure in the air passage drives the actuator to extend, so that the actuator continuously applies pressure to the battery cell module. On the one hand, the pressure on the battery cell is always kept within the preset range, and on the other hand, the actuator expands and contracts with the size change of the battery cell module, reserving space for the volume change of the battery cell and reducing the probability of battery cell damage. When the vehicle is involved in a side collision or crush, the housing may indent into the cavity and apply pressure to the battery cell. At this time, the battery cell can squeeze the actuator, and the actuator contracts along the first direction to absorb the size of the housing intruding into the cavity, avoiding excessive force on the battery cell and reducing the risk of thermal runaway of the battery cell. In addition, the actuator module can be connected to multiple actuators at the same time by setting the air passage. Each actuator can correspond to a single battery cell module. The actuator expands and contracts according to the corresponding battery cell module. The pre-pressure that the battery cell module bears is more in line with the working requirements and improves the working efficiency of the battery cell module. When the battery pack malfunctions, harmful gases may be generated inside. In this situation, both the inlet and outlet valves can be opened. Gas in the air passage flows into the containment chamber through the inlet valve, while harmful gases in the containment chamber enter the air passage through the outlet valve and flow out of the battery pack. This flow of harmful gases along the air passage helps to concentrate and treat them, reducing the hazards caused by their diffusion. Furthermore, the actuator is not driven by the air pressure in the air passage to stop applying pressure to the battery cell module, preventing secondary damage to the battery cell module due to pressure.

[0032] (2) When the battery cell is working normally, the actuator can control the increase and decrease of the air pressure in the air passage, so as to realize the dynamic adjustment of the pressure applied by the actuator to multiple battery cells.

[0033] (3) During normal operation of the battery pack, the gas in the air passage flows normally through the space inside the purification component, and the normal gas has little impact on the purification component and will not affect the subsequent purification of harmful gases by the purification component; when the battery pack is malfunctioning, the harmful gas in the containment cavity enters the air passage through the exhaust valve and then flows through the purification component. The harmful components in the harmful gas will be decomposed or adsorbed by the purification component, and the gas discharged from the air passage will not contain harmful components or will contain harmful components, further preventing the harmful gas from spreading to the environment around the battery pack and improving safety.

[0034] (4) The slider and the execution module are located on opposite sides of the first end plate. The guide protrusion of the slider passes through the through hole to abut against the execution part to transmit force. The first end plate can guide the movement of the guide protrusion, thereby ensuring that the slider moves along the first direction so that the battery cell mainly bears the pressure along the first direction, ensuring the uniformity of the battery cell's force, avoiding damage due to uneven force on the battery cell, extending the battery cell's service life, and reducing the risk of thermal runaway of the battery cell.

[0035] (5) It is beneficial to fix the relative position between the guide protrusion and the actuator, avoid relative deflection between the guide protrusion and the actuator, so as to ensure that the thrust applied by the actuator to the guide protrusion acts directly on the battery cell along the thickness direction of the battery cell, ensure the uniformity of the force on the battery cell, and improve the transmission reliability between the actuator and the slider.

[0036] (6) By inserting the fastener through the first fixing hole and the second fixing hole, the relative position of the guide protrusion and the actuator in the axial direction of the positioning groove can be fixed, and the slider and the actuator move synchronously in the first direction, thereby reducing energy waste and improving force transmission efficiency.

[0037] (7) By utilizing the cavity sidewall to accommodate part of the execution module, the volume of the execution module located outside the housing is reduced, which will not cause the overall volume of the battery pack to increase excessively. Furthermore, the space occupied by the execution module in the cavity is reduced, which is beneficial to increasing the volume of the cell module and thus increasing the energy density of the battery pack.

[0038] (8) The battery pack has a variety of construction methods. The position of the execution module on the housing can be changed according to the usage requirements, which is conducive to improving the applicability of the battery pack and expanding the application range of the battery pack.

[0039] (9) The second end plate cooperates with the first end plate to fix the opposite sides of the cell from the first direction, reducing the probability of cell shaking. The second end plate can withstand the pressure of multiple cells. The pressure of the cell module will not be directly transmitted to the cavity sidewall, which helps to ensure the shape of the cavity sidewall and thus extend the service life and working performance of the battery pack.

[0040] (10) The use of the above-mentioned battery pack can improve the safety of the vehicle.

[0041] (11) When the battery pack malfunctions, harmful gases may be generated inside the battery pack. For example, when the battery cell is a sulfide solid-state battery, hydrogen sulfide gas may be generated when the sulfide solid-state battery malfunctions. At this time, both the inlet valve and the outlet valve can be opened. The gas in the air passage flows into the containment cavity through the inlet valve, and the harmful gas in the containment cavity enters the air passage through the outlet valve and flows out of the battery pack along the air passage. At this time, the harmful gas flows along the air passage and does not diffuse at the explosion-proof valve as in the prior art. This is beneficial for the centralized treatment of harmful gases and reduces the harm caused by the diffusion of harmful gases. In addition, at this time, the actuator is not driven by the air pressure in the air passage and stops applying pressure to the cell module, avoiding the problem of secondary damage to the cell module due to pressure. When the battery pack is working normally, the actuator can be used to apply pressure to the cell module to keep the cell pressure in the cell module within the preset range and ensure the working efficiency of the cell.

[0042] (12) The battery pack is safer under collision or compression conditions. Attached Figure Description

[0043] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0044] Figure 1 This is one of the structural schematic diagrams of the battery pack in the embodiments of the present invention.

[0045] Figure 2 This is the second schematic diagram of the battery pack structure in an embodiment of the present invention.

[0046] Figure 3 This is the third schematic diagram of the battery pack structure in an embodiment of the present invention.

[0047] Figure 4 This is a schematic diagram of the structure of the execution module in an embodiment of the present invention.

[0048] Figure 5 This is one of the partial schematic diagrams of the battery pack in an embodiment of the present invention.

[0049] Figure 6 yes Figure 5 A cross-sectional view along line AA.

[0050] Figure 7 This is a second partial schematic diagram of the battery pack in an embodiment of the present invention.

[0051] Figure 8 yes Figure 7 A sectional view along line BB.

[0052] Figure 9 This is a schematic diagram of the battery cell module in an embodiment of the present invention.

[0053] Figure 10 This is one of the battery pack control methods in the embodiments of the present invention.

[0054] Figure 11 This is the second method for controlling the battery pack in this embodiment of the invention.

[0055] Explanation of reference numerals in the attached figures:

[0056] 1. Battery pack;

[0057] 100. Shell; 101. Receiving cavity; 102. Cavity sidewall; 110. Base; 120. Frame; 140. Separating beam; 150. Short beam; 160. Reinforcing beam;

[0058] 200. Battery cell module; 210. First end plate; 211. Through hole; 220. Slider; 221. Guide protrusion; 222. Positioning groove; 223. Fixed side wall; 224. First fixing hole; 225. Block body; 226. First hole; 227. Second hole; 230. Battery cell; 231. Pressure sensor; 232. Signal connector; 240. Second end plate; 250. Mounting hole; 260. Housing;

[0059] 300, Execution module; 310, Execution unit; 311, Second fixing hole; 320, Air passage; 321, First section; 322, Second section; 323, Third section; 324, Air inlet; 325, Air outlet; 330, Air inlet valve; 340, Air outlet valve; 350, Purification component;

[0060] 400. Fasteners. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0063] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the shape, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0064] The following is combined Figures 1 to 10 The following describes embodiments of the present invention.

[0065] This invention provides a battery pack 1, which includes a housing 100, multiple cell modules 200, and an execution module 300.

[0066] The housing 100 is provided with a receiving cavity 101, and a plurality of battery cell modules 200 are disposed in the receiving cavity 101. Each battery cell module 200 includes a plurality of battery cells 230 stacked along a first direction. The plurality of battery cell modules 200 are arranged along a second direction. The first direction and the second direction intersect. The first direction is the thickness direction of the battery cell 230. The battery cell 230 can be a solid-state battery cell.

[0067] The execution module 300 includes an air passage 320, an inlet valve 330, an outlet valve 340, and multiple execution units 310. The air passage 320 is connected to the housing 100, and the multiple execution units 310 are all connected to the air passage 320. The multiple execution units 310 are spaced apart along a second direction, and the multiple execution units 310 are correspondingly abutted against the multiple battery cell modules 200. Each execution unit 310 is movable along a first direction. Along the gas flow direction in the air passage 320, the outlet valve 340 is located downstream of the inlet valve 330.

[0068] The execution module 300 has a first state and a second state. In the first state, both the inlet valve 330 and the outlet valve 340 are closed. In the second state, both the inlet valve 330 and the outlet valve 340 are open. The gas in the air passage 320 flows into the receiving cavity 101 through the inlet valve 330. The gas in the receiving cavity 101 is discharged after flowing into the air passage 320 through the outlet valve 340.

[0069] The air passage 320 has an inlet end 324 and an outlet end 325. The inlet end 324 can be connected to a device that generates high-pressure gas, and the outlet end 325 is used to discharge the gas in the air passage 320. The outlet end 325 can be connected to an exhaust gas purification device or an exhaust gas recovery device to filter and purify the gas discharged from the outlet end 325, thereby improving the cleanliness of the discharged gas. Alternatively, the outlet end 325 can be directly connected to the bottom or rear of the vehicle, allowing the gas in the air passage 320 to be discharged to the bottom or rear of the vehicle. By controlling the opening and closing of the inlet end 324 and the outlet end 325, the air pressure in the air passage 320 can be controlled, thereby controlling the actuator 310 to move along the first direction to adjust the pre-pressure applied by the actuator 310 to the battery cell module 200.

[0070] When the battery pack 1 is charging, the thickness of the cell 230 increases, and the size of the cell module 200 along the first direction increases. The cell module 200 pushes the actuator 310 to contract along the first direction. When the battery pack 1 is discharging, the thickness of the cell 230 decreases, and the size of the cell module 200 along the first direction decreases. The air pressure in the air passage 320 drives the actuator 310 to extend, so that the actuator 310 continuously applies pressure to the cell module 200. In this way, the actuator 310 can move with the expansion and contraction of the cell 230. On the one hand, it keeps the pressure on the cell 230 within a preset range, ensuring that the cell 230 is in a high-efficiency working state. On the other hand, the actuator 310 expands and contracts with the size change of the cell module 200, reserving space for the volume change of the cell 230 and reducing the probability of damage to the cell 230. The travel distance of the actuator 310 is greater than or equal to the maximum size change of the cell module 200 in the first direction.

[0071] In the event of a side impact or crush, the housing 100 may indent into the receiving cavity 101, exerting pressure on the battery cell 230. At this time, the battery cell 230 can compress the actuator 310, causing the actuator 310 to contract along a first direction to absorb the size of the housing 100 intruding into the receiving cavity 101, preventing excessive force on the battery cell 230 and reducing the risk of thermal runaway. Simultaneously, the vehicle's Battery Management System (BMS) can monitor the pressure of the actuator module 300 or the battery cell 230. When the pressure changes abnormally, the BMS controls the actuator module 300 to stop outputting pressure, significantly reducing the conductivity of the solid-solid interface within the battery cell 230 and drastically reducing the energy output of the battery cell 230. This further reduces the risk of thermal runaway in the battery cell 230, thereby improving the safety of the battery pack 1 under collision and crush conditions.

[0072] In addition, the execution module 300 can be connected to multiple execution units 310 at the same time by setting the air passage 320. Each execution unit 310 can correspond to a single battery cell module 200. The execution unit 310 extends and retracts according to the corresponding battery cell module 200. The battery cell module 200 is more in line with the working requirements by bearing the pre-pressure, which improves the working efficiency of the battery cell module 200.

[0073] When the battery pack 1 malfunctions, harmful gases may be generated inside the battery pack 1. For example, when the battery cell 230 is a sulfide solid-state battery, harmful gases such as hydrogen sulfide may be generated when the sulfide solid-state battery malfunctions. At this time, both the inlet valve 330 and the outlet valve 340 can be opened. The gas in the air passage 320 flows into the receiving cavity 101 through the inlet valve 330. The harmful gas in the receiving cavity 101 enters the air passage 320 through the outlet valve 340 and flows out of the battery pack 1 along the air passage 320. At this time, the harmful gas flows along the air passage 320, which is not like the harmful gas that diffuses at the explosion-proof valve in the prior art. This is conducive to the centralized treatment of harmful gases and reduces the harm caused by the diffusion of harmful gases. Furthermore, the gas generated when battery pack 1 malfunctions may also be at a high temperature. By opening the inlet valve 330 and outlet valve 340, the low-temperature gas in the air passage 320 can be continuously discharged into the receiving cavity 101, and the high-temperature gas in the receiving cavity 101 can be discharged. This prevents the temperature in the receiving cavity 101 from continuously rising, reduces the probability of thermal runaway propagation, and improves the safety of battery pack 1. Also, at this time, the actuator 310 is not driven by the air pressure in the air passage 320 and stops applying pressure to the cell module 200, avoiding secondary damage to the cell module 200 due to pressure.

[0074] Furthermore, if the intake valve 330 and the exhaust valve 340 are located in the housing 100, the air passage 320 and the intake valve 330 need to be connected to the air supply device separately, which makes the layout inconvenient. In this embodiment of the invention, one air passage 320 is used to both supply air to the actuator 310 to ensure the normal operation of the actuator 310, and to discharge the gas in the receiving cavity 101 in case of abnormal operation of the battery pack 1. The two functions reuse the air passage 320, and the air passage 320 can be connected to an external air supply device, which makes the layout more convenient and reduces the number of external parts.

[0075] For example, the intake valve 330 and the exhaust valve 340 can be located on opposite sides of the battery pack 1 in the second direction. The gas discharged from the intake valve 330 can diffuse more comprehensively within the battery pack 1, reducing the residual amount of harmful gases within the battery pack 1. The air duct 320 can be constructed as a straight pipe, meaning that the intake end 324 and the exhaust end 325 of the air duct 320 can be located on opposite sides of the battery pack 1 in the second direction. The air duct 320 extends along the second direction, with the intake valve 330 located at the intake end 324 and the exhaust valve 340 located at the exhaust end 325. Alternatively, the air duct 320 can be constructed as a bent pipe, meaning that the intake end 324 and the exhaust end 325 of the air duct 320 can be located on the same side of the battery pack 1 in the second direction. The intake valve 330 can be located approximately at the bend of the air duct 320, and the exhaust valve 340 is located at the exhaust end 325.

[0076] Additionally, the inlet valve 330 and outlet valve 340 can be solenoid valves or other valve bodies capable of performing the aforementioned functions. When the battery pack 1 malfunctions, the outlet valve 340 can be opened first to allow some of the gas in the receiving cavity 101 to escape through the outlet valve 340, reducing the gas pressure in the receiving cavity 101 to a certain range. Then, the inlet valve 330 can be opened to prevent the gas pressure in the receiving cavity 101 from continuing to rise and causing the battery pack 1 to explode. Alternatively, the opening diameter of the outlet valve 340 can be larger than the opening diameter of the inlet valve 330. In this case, the outlet valve 340 and the inlet valve 330 can be opened simultaneously. Since the outlet rate of the outlet valve 340 can be greater than the inlet rate of the inlet valve 330, the temperature of the harmful gas may be relatively high. The air valve 340 and the air inlet valve 330 can prevent excessive increase in air pressure in the housing 101 while avoiding temperature buildup inside the housing 101, thus improving the safety of the battery pack 1. Alternatively, the number of air outlet valves 340 can be greater than the number of air inlet valves 330, so that the total air outlet rate of the air outlet valves 340 is greater than the total air inlet rate of the air inlet valves 330. In this case, the air outlet valves 340 and the air inlet valves 330 can be opened simultaneously to promptly discharge the high-temperature gas inside the housing 101, ensuring that the air pressure in the housing 101 does not increase excessively while avoiding temperature buildup inside the housing 101, thus improving the safety of the battery pack 1.

[0077] In some embodiments, such as Figure 4As shown, the air passage 320 includes a first section 321, a second section 322, and a third section 323 connected in sequence. An intake valve 330 is located between the first section 321 and the second section 322, and an outlet valve 340 is located between the first section 321 and the second section 322. The end of the first section 321 furthest from the second section 322 forms an intake end 324, and the end of the third section 323 furthest from the second section 322 forms an outlet end 325. The first state includes a first sub-state and a second sub-state. In the first sub-state, the first section 321 and the second section 322 are connected. In the second sub-state, the second section 322 and the third section 323 are connected. In the second state, the first section 321 and the third section 323 are connected through the intake valve 330, the receiving cavity 101, and the outlet valve 340.

[0078] When the battery cell 230 is working normally, the actuator module 300 can control the increase and decrease of air pressure in the air passage 320, realizing the dynamic adjustment of the pressure applied by the actuator 310 to multiple battery cells 230. When the battery cell 230 is malfunctioning, the intake and exhaust of air passage 320 can promptly expel harmful gases from the containment cavity 101.

[0079] In some embodiments, such as Figure 2 and Figure 4 As shown, the execution module 300 also includes a purification component 350, which is disposed in the air passage 320. The purification component 350 is located downstream of the outlet valve 340 along the gas flow direction within the air passage 320. Specifically, the purification component 350 is disposed in the third section 323 and is used to purify the gas flowing out of the receiving cavity 101 through the outlet end 325.

[0080] The purification component 350 may contain an adsorbent that can absorb harmful gases; alternatively, it may contain a heating structure or a microwave structure that can decompose harmful gases; or it may contain a substance that can chemically react with harmful gases. The purification method used by the purification component 350 for harmful gases is not specifically limited here; different purification methods can be used depending on the different battery cells 230, and common harmful gas purification techniques can be employed.

[0081] In this way, during normal operation of the battery pack 1, the gas in the air passage 320 can flow normally through the space inside the purification component 350. Normal gas has little impact on the purification component 350 and will not affect the subsequent purification of harmful gases by the purification component 350. When the battery pack 1 malfunctions, the harmful gas in the receiving cavity 101 enters the air passage 320 through the exhaust valve 340 and then flows through the purification component 350. The harmful components in the harmful gas will be decomposed or adsorbed by the purification component 350, and the gas discharged from the air passage 320 will not contain harmful components or will contain harmful components, further preventing the harmful gas from spreading to the environment around the battery pack 1 and improving safety.

[0082] In some embodiments, such as Figure 6 , Figure 8 and Figure 9 As shown, the battery cell module 200 also includes a first end plate 210 and a slider 220. The first end plate 210 is connected to the housing 100 and is located on the same side of the plurality of battery cells 230 in a first direction. The first end plate 210 is provided with a through hole 211. The slider 220 is disposed between the first end plate 210 and the battery cells 230 and is movable along the first direction. The slider 220 has a guide protrusion 221 that passes through the through hole 211. The actuator 310 abuts against the guide protrusion 221 to drive the slider 220 to move along the first direction, and the slider 220 applies pressure to the battery cells 230.

[0083] The outer contour of the cross-section of the actuator 310 can be rectangular, circular, regular polygonal, or irregular, and the outer contour of the cross-section of the guide protrusion 221 can be rectangular, circular, regular polygonal, or irregular. The first end plates 210 of adjacent battery cell modules 200 located in the same receiving cavity 101 can be constructed as a single unit to improve installation efficiency and accuracy.

[0084] For example, the slider 220 also has a block body 225, which abuts against the battery cell 230. A guide protrusion 221 is connected to the end of the block body 225 facing the first end plate 210. The orthographic projection of the guide protrusion 221 on the first end plate 210 is located within the orthographic projection of the block body 225 on the first end plate 210. The contact area between the block body 225 and the battery cell 230 is larger, which helps to ensure uniform force distribution in each area of ​​the battery cell 230 and avoid damage caused by excessive local force on the battery cell 230. When the overall size of multiple batteries 230 in the first direction is at its maximum value, the first end plate 210 and the block body 225 can still be spaced apart to avoid interference between the first end plate 210 and the block body 225.

[0085] The actuator 310 can be a cylinder, which includes a cylinder shell and a piston. The cylinder shell is connected to the air passage 320, and the piston is telescopically connected to the cylinder shell. The piston is provided with abutting against the guide protrusion 221.

[0086] The slider 220 and the execution module 300 are located on opposite sides of the first end plate 210. The guide protrusion 221 of the slider 220 passes through the through hole 211 to abut against the execution part 310 for force transmission. The first end plate 210 can guide the movement of the guide protrusion 221, thereby ensuring that the slider 220 moves along the first direction so that the cell 230 mainly bears the pressure along the first direction, ensuring the uniformity of the force on the cell 230, avoiding damage due to uneven force on the cell 230, extending the service life of the cell 230, and reducing the risk of thermal runaway of the cell 230.

[0087] Furthermore, such as Figure 6 As shown, the guide protrusion 221 has a positioning groove 222 at one end facing the actuator 310, and the actuator 310 is inserted into the positioning groove 222. This helps to fix the relative position between the guide protrusion 221 and the actuator 310, and avoids relative deflection between the guide protrusion 221 and the actuator 310. This ensures that the thrust applied by the actuator 310 to the guide protrusion 221 acts directly on the battery cell 230 along the thickness direction of the battery cell 230, ensuring the uniformity of the force on the battery cell 230 and improving the transmission reliability between the actuator 310 and the slider 220.

[0088] For example, such as Figure 8 As shown, the actuator 310 can be constructed as a cylindrical structure. The end of the guide protrusion 221 facing the actuator 310 may not have a positioning groove 222. On a plane perpendicular to the axial direction of the actuator 310, the orthographic projection of the actuator 310 is located within the orthographic projection of the guide protrusion 221, so that the actuator 310 can pass through the through hole 211, increasing the movable distance of the actuator 310 and the slider 220.

[0089] like Figure 6 As shown, the guide protrusion 221 forms a fixed sidewall 223 along the circumference of the positioning groove 222. The fixed sidewall 223 is provided with a first fixing hole 224, and the actuator 310 is provided with a second fixing hole 311. Both the first fixing hole 224 and the second fixing hole 311 extend radially from the positioning groove 222. The battery pack 1 also includes a fixing member 400, which passes through the first fixing hole 224 and the second fixing hole 311.

[0090] For example, the first fixing hole 224 includes a first hole portion 226 and a second hole portion 227. The first hole portion 226 and the second hole portion 227 are located on opposite radial sides of the positioning groove 222. The inner peripheral wall of the second hole portion 227 may be provided with threads. The fixing member 400 is sequentially inserted into the first hole portion 226, the second fixing hole 311 and the second hole portion 227. The fixing member 400 is threadedly engaged with the second hole portion 227.

[0091] By inserting the fastener 400 through the first fixing hole 224 and the second fixing hole 311, the relative positions of the guide protrusion 221 and the actuator 310 in the axial direction of the positioning groove 222 can be fixed. The slider 220 and the actuator 310 move synchronously in the first direction, thereby reducing energy waste and improving force transmission efficiency.

[0092] Specifically, the outer peripheral surface of the fixed sidewall 223 extends beyond the end face of the fixing member 400. That is, the fixing member 400 does not extend beyond the outer peripheral surface of the fixed sidewall 223 along the radial direction of the actuating part 310.

[0093] In this way, when the actuator 310 moves along the first direction, interference between the fixing member 400 and the first end plate 210 can be avoided. The fixing member 400 can pass through the through hole 211, expanding the movable range of the actuator 310 and the guide protrusion 221, which is beneficial to adapting to the size changes caused by the expansion and contraction of multiple cells 230.

[0094] In some embodiments, such as Figures 1-3 , Figure 5 and Figure 7 As shown, the housing 100 forms a cavity sidewall 102 along the circumference of the receiving cavity 101, and the cavity sidewall 102 has an opening on the side facing the receiving cavity 101. The air passage 320, the actuator 310 and the air intake valve 330 are disposed in the cavity sidewall 102, and the plurality of actuators 310 pass through the plurality of openings.

[0095] The cavity sidewall 102 is also provided with an opening for exposing the air inlet valve 330 and the air outlet valve 340.

[0096] In this way, by utilizing the cavity sidewall 102 to accommodate part of the structure of the execution module 300, the volume of the execution module 300 located outside the housing 100 is reduced, which will not cause the overall volume of the battery pack 1 to increase excessively, and the space occupied by the execution module 300 in the cavity 101 is reduced, which is conducive to increasing the volume of the cell module 200, thereby increasing the energy density of the battery pack 1.

[0097] In some embodiments, such as Figures 1-3 , Figure 5 and Figure 7 As shown, the housing 100 includes a base 110, a frame 120, a cover plate (not shown), and a partition beam 140. The frame 120 is connected to the base 110 and is arranged around the base 110 circumferentially. The cover plate is connected to the side of the frame 120 facing away from the base 110. The partition beam 140 connects the base 110 and the cover plate. The base 110, frame 120, cover plate, and partition beam 140 form at least one receiving cavity 101. The frame 120 and partition beam 140 form cavity sidewalls 102. That is, the execution module 300 is disposed in the frame 120, or the execution module 300 is disposed in the partition beam 140, or one execution module 300 is disposed in the frame 120 and the other execution module 300 is disposed in the partition beam 140.

[0098] The housing 100 may further include at least one short beam 150, which connects the partition beam 140 and the frame 120. The short beam 150 divides the receiving cavity 101 into multiple sub-receiving cavities, each of which houses a battery cell module 200. The short beam 150 and the partition beam 140 are arranged perpendicularly, and the short beam 150 can extend along a first direction. Furthermore, the housing 100 may also include a reinforcing beam 160. The base 110, frame 120, cover plate, partition beam 140, and reinforcing beam 160 together form a load-bearing frame to enhance the structural strength of the battery pack 1. Additionally, a cooling component may or may not be provided between the battery cell module 200 and the base 110.

[0099] Specifically, when the execution module 300 is disposed within the partition beam 140, the partition beam 140 may be provided with execution modules 300 on both sides of the partition beam 140 in the first direction to apply pressure to the cell modules 200 in the accommodating cavities 101 on both sides of the partition beam 140 in the width direction; when the execution module 300 is disposed within the frame 120, the frame 120 located on both sides of the partition beam 140 in the first direction may be provided with execution modules 300 to apply pressure to the cell modules 200 in the accommodating cavities 101 on both sides of the partition beam 140 in the width direction.

[0100] In this way, the battery pack 1 can be constructed in a variety of ways, and the position of the execution module 300 on the housing 100 can be changed according to the usage requirements, which is conducive to improving the applicability of the battery pack 1 and expanding the application range of the battery pack 1.

[0101] In some embodiments, such as Figure 9 As shown, the battery cell module 200 also includes a second end plate 240. The first end plate 210 and the second end plate 240 are located on opposite sides of the plurality of battery cells 230 in a first direction. Both the first end plate 210 and the second end plate 240 are connected to the base 110. The second end plate 240 can abut against the cavity sidewall 102.

[0102] For example, both the first end plate 210 and the second end plate 240 are provided with multiple mounting holes 250. The battery pack 1 also includes multiple mounting components, which are correspondingly inserted into the multiple mounting holes 250. The mounting components are connected to the base 110. The mounting components and the base 110 can be threaded together to fix the relative position between the first end plate 210 and the second end plate 240.

[0103] Furthermore, the cell module 200 also includes a housing 260. The first end plate 210 and the second end plate 240 are both connected to the housing 260. The first end plate 210 and the second end plate 240 can be welded and fixed to the housing 260. The housing 260 is located on the side of the cell 230 facing away from the base 110. Thus, the base 110, the first end plate 210, the second end plate 240 and the housing 260 together cover multiple cells 230, reducing the probability of cell 230 shaking and damage.

[0104] If the execution module 300 is located on the partition beam 140, the first end plate 210 is located between the battery cell 230 and the partition beam 140, and the second end plate 240 is located between the battery cell 230 and the frame 120, and the second end plate 240 can be attached to the frame 120; if the execution module 300 is located on the frame 120, the first end plate 210 is located between the battery cell 230 and the frame 120, and the second end plate 240 is located between the battery cell 230 and the partition beam 140, and the second end plate 240 can be attached to the partition beam 140.

[0105] By setting the second end plate 240 to cooperate with the first end plate 210, the battery cell 230 can be fixed from both sides in the thickness direction of the battery cell 230, reducing the probability of the battery cell 230 shaking. In addition, the second end plate 240 can withstand the pressure of the battery cell 230, and the pressure of the battery cell module 200 will not be directly transmitted to the cavity sidewall 102, which helps to ensure the shape of the cavity sidewall 102, thereby extending the service life and working performance of the battery pack 1.

[0106] Among them, the second end plates 240 of adjacent cell modules 200 located in the same receiving cavity 101 can be constructed as one unit to improve installation efficiency and installation accuracy.

[0107] This invention also proposes a vehicle including the aforementioned battery pack 1.

[0108] The vehicle of this embodiment of the invention, utilizing the above-described battery pack 1, has the advantage of high safety.

[0109] like Figure 10 As shown, an embodiment of the present invention also proposes a control method for battery pack 1, the control method for battery pack 1 including:

[0110] Determine if cell 230 is malfunctioning;

[0111] If so, both the inlet valve 330 and the outlet valve 340 of the control execution module 300 are opened, so that the gas in the air passage 320 enters the receiving cavity 101 through the inlet valve 330, thereby driving the gas in the receiving cavity 101 to be discharged through the outlet valve 340.

[0112] If not, both the intake valve 330 and the exhaust valve 340 are closed, and the gas in the control air passage 320 is allowed to enter or exit to adjust the position of the actuator 310. The gas in the air passage 320 drives the actuator 310 to apply pressure to the battery cell module 200, so as to keep the pressure of the battery cell 230 in the battery cell module 200 within a preset range.

[0113] The battery pack 1 can be equipped with a concentration sensor to detect the concentration of harmful gases within it; alternatively, the battery pack 1 can be equipped with a pressure sensor 231 to detect the pressure exerted on the battery cell 230; or a temperature sensor can be installed within the battery pack 1 to detect the temperature; or the voltage or current of the battery cell 230 can be detected. All of these methods can be used to determine whether the battery cell 230 is malfunctioning. Of course, other methods can also be used to determine whether the battery cell 230 is malfunctioning.

[0114] When the battery pack 1 malfunctions, harmful gases may be generated inside it. For example, if the battery cell 230 is a sulfide solid-state battery, a malfunction in the sulfide solid-state battery may generate hydrogen sulfide gas. In this case, both the inlet valve 330 and the outlet valve 340 can be opened. The gas in the air passage 320 flows into the receiving cavity 101 through the inlet valve 330, and the harmful gas in the receiving cavity 101 enters the air passage 320 through the outlet valve 340 and flows out of the battery pack 1 along the air passage 320. At this time, the harmful gas flows along the air passage 320, instead of diffusing at the explosion-proof valve as in the prior art. This is beneficial for the centralized treatment of harmful gases and reduces the harm caused by the diffusion of harmful gases. Furthermore, at this time, the actuator 310 is not driven by the air pressure in the air passage 320 and also stops applying pressure to the battery cell module 200, avoiding the problem of secondary damage to the battery cell module 200 due to pressure.

[0115] When the battery pack 1 is working normally, the actuator 310 can apply pressure to the cell module 200 to keep the pressure of the cell 230 in the cell module 200 within a preset range, thereby ensuring the working efficiency of the cell 230.

[0116] Furthermore, such as Figure 11 As shown, the control method for battery pack 1 also includes:

[0117] After determining that cell 230 was malfunctioning;

[0118] Obtain the pressure value of cell 230;

[0119] If the pressure value is less than or equal to the first preset value, the gas in the control air passage 320 is allowed to enter or exit to adjust the position of the actuator 310, and the actuator 310 is controlled to apply pressure to the battery cell module 200 to keep the pressure of the battery cell 230 in the battery cell module 200 within the preset range.

[0120] If the pressure value is greater than the first preset value and less than or equal to the second preset value, the gas in the control air passage 320 is allowed to enter or exit to adjust the position of the actuator 310. The actuator 310 is controlled to apply pressure to the battery module 200 to keep the pressure of the battery cell 230 in the battery module 200 within the preset range until the actuator 310 moves to the limit position, and the control air passage 320 stops air intake and starts air exhaust.

[0121] If the pressure value exceeds the second preset value, the control airway 320 stops air intake and begins exhaust. The first preset value can be 2MPa, and the second preset value can be 5MPa.

[0122] The first preset value is less than the second preset value.

[0123] like Figure 7 As shown, the cell module 200 also includes a pressure sensor 231, which abuts against the side of at least one cell 230 in a first direction. The execution module 300 is electrically connected to the pressure sensor 231, and adjusts the output pressure according to the electrical signal from the pressure sensor 231. The pressure sensor 231 is connected to a signal connector 232, which extends from the housing 100 and is connected to the battery management system. The battery management system receives the electrical signal from the pressure sensor 231 and converts it into a pressure value to adjust the output pressure of the execution module 300. The execution module 300 may integrate a pressure detection device to detect the output pressure of the execution module 300, ensuring that the output pressure meets requirements and achieving precise pressure control.

[0124] For example, pressure sensor 231 can be disposed between two adjacent cells 230, pressure sensor 231 can be disposed between cell 230 and slider 220, and pressure sensor 231 can be disposed between cell 230 and second end plate 240.

[0125] By setting pressure sensor 231, the pressure on the battery cell 230 can be detected in real time, and the output pressure of the execution module 300 can be dynamically adjusted to achieve precise pressure control and ensure that the battery cell 230 is in a high-efficiency state.

[0126] When the battery cell 230 is charging, the thickness of the battery cell 230 expands, and the overall size of multiple battery cells 230 increases in the first direction. The pressure value detected by the pressure sensor 231 increases. When the pressure after conversion by the battery management system is less than or equal to 2MPa, the expansion of multiple battery cells 230 pushes the slider 220 and the actuator 310 to move away from the battery cell 230. The actuator 300 reduces the pressure output so that the pressure detected by the pressure sensor 231 of the battery cell 230 returns to the preset range.

[0127] When the battery cell 230 discharges, the thickness of the battery cell 230 shrinks, the overall size of multiple battery cells 230 decreases in the first direction, the pressure value detected by the pressure sensor 231 decreases, and when the pressure after conversion by the battery management system is less than or equal to 2MPa, the execution module 300 increases the pressure output, pushing the slider 220 and the execution unit 310 to move closer to the battery cell 230, so that the pressure detected by the pressure sensor 231 of the battery cell 230 returns to the preset range;

[0128] When the vehicle is working normally, the pressure of each cell 230 is roughly in a steady-state equilibrium, maintaining the pressure of the cell 230 within a preset range to ensure the normal operation of the cell 230.

[0129] If the housing 100 deforms under pressure and intrudes into the space of the receiving cavity 101, the pressure on the cell 230 gradually increases, and the pressure value detected by the pressure sensor 231 gradually increases. When the pressure converted by the battery management system is greater than 2MPa and less than or equal to 5MPa, the battery management system control execution module 300 reduces the pressure output so that the pressure on the cell 230 can be restored to the preset range as much as possible. In this case, if the actuator 310 moves away from the cell 230 to its maximum stroke, and the pressure converted by the battery management system is still greater than 2MPa, the battery management system control execution module 300 stops outputting pressure.

[0130] In this way, the deformation of the cell module 200 is minimized, that is, the intrusion of the cell 230 is minimized, reducing the risk of thermal runaway caused by mechanical damage to the cell 230, and minimizing the pressure on the cell module 200. The solid-solid interface inside the solid cell responds to mechanical damage with the minimum conductivity (i.e., the minimum energy release state), further reducing the risk of thermal runaway.

[0131] When the casing 100 is subjected to an instantaneous impact, the pressure on the cell 230 increases instantaneously and significantly. The pressure value detected by the pressure sensor 231 increases instantaneously and significantly. When the pressure converted by the battery management system is greater than 5MPa, the battery management system control execution module 300 stops outputting pressure to minimize the pressure on the cell 230. The solid-solid interface inside the solid cell responds to mechanical damage with minimum conductivity (i.e., minimum energy release state) to reduce the risk of thermal runaway.

[0132] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

[0133] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that, include: The housing (100) is provided with a receiving cavity (101). Multiple battery cell modules (200) are disposed in the receiving cavity (101). Each battery cell module (200) includes multiple battery cells (230) stacked along a first direction. The multiple battery cell modules (200) are arranged along a second direction, and the first direction and the second direction intersect each other. An execution module (300) includes an air passage (320), an inlet valve (330), an outlet valve (340), and multiple execution units (310). Each execution unit (310) is connected to the air passage (320) and is spaced apart along a second direction. Each execution unit (310) correspondingly abuts against multiple battery cell modules (200). Each execution unit (310) is movable along the first direction. The execution module (300) has a first state and a second state. In the first state, both the inlet valve (330) and the outlet valve (340) are closed. In the second state, both the inlet valve (330) and the outlet valve (340) are open. The gas in the air passage (320) flows into the receiving cavity (101) through the inlet valve (330), and the gas in the receiving cavity (101) is discharged after flowing into the air passage (320) through the outlet valve (340). The air passage (320) includes a first section (321), a second section (322), and a third section (323) connected in sequence. The intake valve (330) is located between the first section (321) and the second section (322), and the exhaust valve (340) is located between the first section (321) and the second section (322). The end of the first section (321) away from the second section (322) forms an intake end (324), and the end of the third section (323) away from the second section (322) forms an exhaust end (325). The first state includes a first sub-state and a second sub-state. In the first sub-state, the first segment (321) and the second segment (322) are connected. In the second sub-state, the second segment (322) and the third segment (323) are connected. In the second state, the first segment (321) and the third segment (323) are connected through the intake valve (330), the receiving cavity (101), and the exhaust valve (340).

2. The battery pack according to claim 1, characterized in that, The execution module (300) further includes: Purification component (350), which is located in the third section (323), is used to purify the gas flowing out of the receiving cavity (101) through the gas outlet (325).

3. The battery pack according to claim 1, characterized in that, The battery cell module (200) also includes: A first end plate (210) is connected to the housing (100). The first end plate (210) is located on the same side of the plurality of battery cells (230) in the first direction. The first end plate (210) is provided with a through hole (211). A slider (220) is disposed between the first end plate (210) and the battery cell (230). The slider (220) is movable along the first direction. The slider (220) has a guide protrusion (221) that passes through the through hole (211). The actuator (310) abuts against the guide protrusion (221) to drive the slider (220) to move along the first direction.

4. The battery pack according to claim 3, characterized in that, The guide protrusion (221) has a positioning groove (222) at one end facing the actuator (310), and the actuator (310) is inserted into the positioning groove (222).

5. The battery pack according to claim 4, characterized in that, The guide protrusion (221) forms a fixed sidewall (223) along the circumference of the positioning groove (222). The fixed sidewall (223) is provided with a first fixing hole (224), and the execution part (310) is provided with a second fixing hole (311). The first fixing hole (224) and the second fixing hole (311) both extend radially along the positioning groove (222). The battery pack (1) also includes a fastener (400) which passes through the first fixing hole (224) and the second fixing hole (311).

6. The battery pack according to claim 5, characterized in that, The cell module (200) further includes a second end plate (240), the first end plate (210) and the second end plate (240) are located on opposite sides of the plurality of cells (230) in the first direction, and both the first end plate (210) and the second end plate (240) are connected to the housing (100).

7. The battery pack according to any one of claims 1-6, characterized in that, The housing (100) forms a cavity sidewall (102) along the circumference of the receiving cavity (101). The cavity sidewall (102) has a plurality of openings on the side facing the receiving cavity (101). The air passage (320), the actuator (310) and the air inlet valve (330) are disposed in the cavity sidewall (102). The plurality of actuators (310) pass through the plurality of openings.

8. The battery pack according to claim 7, characterized in that, The housing (100) includes: Base (110); A frame (120) is connected to the base (110), and the frame (120) is arranged circumferentially around the base (110); The cover plate is connected to the side of the frame (120) facing away from the base (110); A partition beam (140) is connected between the base (110) and the cover plate. The base (110), the frame (120), the cover plate and the partition beam (140) form at least one of the receiving cavities (101). The frame (120) and the partition beam (140) form the cavity sidewalls (102).

9. A vehicle, characterized in that, Includes the battery pack as described in any one of claims 1-8.

10. A method for controlling a battery pack, characterized in that, include: Determine if the battery cell (230) is malfunctioning; If so, both the inlet valve (330) and the outlet valve (340) of the control execution module (300) are opened, so that the gas in the air passage (320) of the execution module (300) enters the receiving cavity (101) in the housing (100) through the inlet valve (330), thereby driving the gas in the receiving cavity (101) to be discharged through the outlet valve (340); If not, control both the intake valve (330) and the exhaust valve (340) to close, and control the gas in the air passage (320) to enter or exit to adjust the position of the actuator (310) so as to keep the pressure of the battery cell (230) in the battery cell module (200) within a preset range.

11. The control method for the battery pack according to claim 10, characterized in that, Also includes: After determining that the battery cell (230) is malfunctioning; Obtain the pressure value of the battery cell (230); If the pressure value is less than or equal to the first preset value, the gas in the air passage (320) is controlled to enter or exit to adjust the position of the actuator (310) so as to keep the pressure of the battery cell (230) in the battery cell module (200) within the preset range; If the pressure value is greater than the first preset value and less than or equal to the second preset value, the gas in the air passage (320) is controlled to enter or exit to adjust the position of the actuator (310) so as to keep the pressure of the battery cell (230) in the battery cell module (200) within the preset range until the actuator (310) moves to the limit position, and the air passage (320) is controlled to stop the intake of air and start the exhaust. If the pressure value is greater than the second preset value, the air passage (320) is controlled to stop air intake and start exhaust.

Images