Bottom plate of battery pack, battery and control method thereof

Abstract

The invention discloses a bottom plate of a battery pack, a battery and a control method of the battery pack. The bottom plate of the battery pack comprises a bottom protection plate; the liquid cooling plate is arranged on the upper side of the bottom protection plate and spaced from the bottom protection plate, the liquid cooling plate is used for supporting the battery cell, an anti-explosion valve is arranged at the bottom of the battery cell, and an exhaust hole corresponding to the anti-explosion valve is formed in the liquid cooling plate; the protection block is movably arranged in the exhaust hole, and the protection block and the anti-explosion valve are arranged at an interval; and the driving device is connected with the protection block and is used for driving the protection block to move in the direction away from the liquid cooling plate so as to be separated from the exhaust hole under the condition that the deviation between the voltage change trend of the battery cell and the preset change trend exceeds a threshold value. By arranging the protection block in the exhaust hole, when the bottom protection plate is subjected to impact deformation or damage, the protection block cannot penetrate through the exhaust hole to damage the explosion-proof valve at the bottom of the battery cell, a good physical protection effect is achieved on the explosion-proof valve at the bottom of the battery cell, and when thermal runaway occurs, the protection block can be controlled by the driving device to open the exhaust hole to ensure smooth exhaust; and the overall safety is higher.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a bottom plate of a battery pack, a battery and a control method thereof. Background Art

[0002] In recent years, the booming development of electric vehicles has prompted the continuous optimization of power battery design to ensure vehicle safety. In order to ensure thermal and electrical separation, some batteries are designed with a pressure relief valve installed at the bottom of the battery cell, and the risk of thermal runaway caused by excessive internal pressure is prevented through the exhaust channel with holes at the bottom. After the high-temperature airflow is discharged from the pressure relief valve, it can avoid directly impacting the busbar above the pole, thereby reducing the potential safety hazards of high-voltage arcing and ignition.

[0003] However, during the driving process of the vehicle, if the bottom is bumped or supported, the pressure relief valve at the bottom of the battery cell may be easily damaged, which will not only cause electrolyte leakage, but may also cause more serious safety accidents due to the pressure relief valve piercing into the battery cell. This undoubtedly increases the safety risks of vehicle use. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a bottom plate of a battery pack, a battery and a control method thereof, which play a good physical protection role for the explosion-proof valve and help improve the safety of the entire battery.

[0005] In a first aspect, the present application provides a bottom plate of a battery pack, comprising: Bottom guard plate; A liquid cooling plate is arranged on the upper side of the bottom guard plate and is spaced apart from the bottom guard plate. The liquid cooling plate is used to support the battery cell. An explosion-proof valve is arranged at the bottom of the battery cell. An exhaust hole corresponding to the explosion-proof valve is arranged on the liquid cooling plate. A protective block is movably arranged in the exhaust hole and is spaced apart from the explosion-proof valve; The driving device is connected to the protection block and is used to drive the protection block to move in a direction away from the liquid cooling plate to disengage from the exhaust hole when the deviation between the voltage change trend of the battery cell and the preset change trend exceeds a threshold.

[0006] According to the bottom plate of the battery pack of the present application, a protective block is arranged in the exhaust hole so that when the bottom protective plate is deformed or damaged by impact, the explosion-proof valve at the bottom of the battery cell will not pass through the exhaust hole to damage the explosion-proof valve at the bottom of the battery cell. This provides good physical protection for the explosion-proof valve at the bottom of the battery cell, and when thermal runaway occurs, the protective block can be controlled by a driving device to open the exhaust hole to ensure smooth exhaust, thereby improving overall safety.

[0007] According to an embodiment of the present application, an elastic member is provided between the protection block and the bottom guard plate, and the protection block abuts against the exhaust hole under the action of the elastic member.

[0008] According to one embodiment of the present application, the driving device includes an electromagnetic device, the protective block includes a magnetic block, the electromagnetic device is arranged on the bottom guard plate, and the electromagnetic device can apply a suction force to the protective block toward the bottom guard plate.

[0009] According to one embodiment of the present application, the driving device includes at least two movable parts, and the two movable parts move in directions approaching and moving away from each other. A slider is connected to the end of the elastic part away from the protective block. The slider slides with the two relative movable parts and moves in a direction approaching the battery cell when the two movable parts approach each other, and moves in a direction away from the battery cell when the two movable parts move away from each other.

[0010] According to one embodiment of the present application, a support plate is provided between the liquid cooling plate and the bottom guard plate, the protective block is mounted on the support plate and at least partially extends into the exhaust hole, and the driving device is connected to the support plate for driving the support plate to move in a direction away from the liquid cooling plate.

[0011] According to an embodiment of the present application, the dimension of the protective block at one end close to the battery cell is smaller than the cross-sectional dimension of the exhaust hole, and the dimension of the protective block at one end away from the battery cell is larger than the cross-sectional dimension of the exhaust hole.

[0012] According to an embodiment of the present application, a height of a portion of the protection block located in the exhaust hole is smaller than a height of the exhaust hole.

[0013] In a second aspect, the present application provides a battery, the battery comprising: Battery cell, with an explosion-proof valve at the bottom of the battery cell; A bottom plate of a battery pack according to any technical solution of the first aspect; The controller is electrically connected to the battery cell and the driving device, and is used to control the driving device to drive the protection block to move in a direction away from the liquid cooling plate according to the voltage change trend of the battery cell.

[0014] The beneficial effects of the battery provided in the second aspect of the present application are the same as the beneficial effects of the bottom plate of the battery pack provided in the first aspect, and will not be repeated here.

[0015] In a third aspect, the present application provides a control method for a battery as in the second aspect, the control method comprising: Get the voltage change trend of the battery cell; When the deviation between the voltage variation trend of the battery cell and the preset variation trend exceeds a threshold value, the protection block corresponding to the battery cell is controlled to move in a direction away from the liquid cooling plate.

[0016] According to the battery control method provided in the present application, whether the battery cell is in a normal working state is judged by obtaining the voltage change trend of the battery cell. When it is judged that the working state of the battery cell deviates from normal, the movement of the protection block is controlled in advance so that the battery cell can be exhausted smoothly when thermal runaway occurs, and the judgment is accurate and the safety is high.

[0017] According to one embodiment of the present application, the liquid cooling plate is provided with a plurality of exhaust holes corresponding one-to-one to the plurality of battery cells, and the protection block is provided with a plurality of exhaust holes corresponding to the plurality of exhaust holes; When the deviation between the voltage variation trend and the preset variation trend exceeds a threshold, controlling the protection block corresponding to the battery cell and the protection block corresponding to at least one adjacent battery cell to move in a direction away from the liquid cooling plate; or, Control all the protection blocks to move in a direction away from the liquid cooling plate.

[0018] In a fourth aspect, the present application provides a battery control device, the control device comprising: An acquisition module is used to obtain the voltage change trend of the battery cell; The control module is used to control the protection block corresponding to the battery cell to move in a direction away from the liquid cooling plate when the deviation between the voltage change trend of the battery cell and the preset change trend exceeds a threshold.

[0019] According to the battery control device of the present application, whether the battery cell is in a normal working state is judged by obtaining the voltage change trend of the battery cell. When it is judged that the working state of the battery cell deviates from normal, the movement of the protection block is controlled in advance so that the battery cell can be exhausted smoothly when thermal runaway occurs, and the judgment is accurate and the safety is high.

[0020] In a fifth aspect, the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the battery control method as described in the third aspect above is implemented.

[0021] In a sixth aspect, the present application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the battery control method as described in the third aspect above.

[0022] In a seventh aspect, the present application provides a chip, the chip comprising a processor and a communication interface, the communication interface and the processor are coupled, and the processor is used to run programs or instructions to implement the battery control method as in the third aspect.

[0023] In an eighth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the battery control method as described in the third aspect above.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 It is a schematic diagram of the assembly structure of the protection block and the bottom guard plate provided in an embodiment of the present application; Figure 2 is a structural schematic diagram of a bottom plate of a battery pack provided in an embodiment of the present application; Figure 3 It is a schematic diagram of the assembly structure of the battery cell and the liquid cooling plate provided in an embodiment of the present application; Figure 4 is another schematic diagram of the assembly structure of the battery cell and the liquid cooling plate provided in an embodiment of the present application; Figure 5 It is a schematic diagram of the assembly structure of the protection block and the bottom guard plate provided in the embodiment of the present application; Figure 6 It is a schematic diagram of the assembly structure of the protection block and the sliding block provided in the embodiment of the present application; Figure 7 It is a schematic diagram of the matching structure of the slider and the movable block provided in the embodiment of the present application; Figure 8 is another schematic diagram of the matching structure of the slider and the movable block provided in an embodiment of the present application; Fig. 9 is a flow chart of a battery control method provided in an embodiment of the present application; Fig.10 is a schematic diagram of the structure of a battery control device provided in an embodiment of the present application; Fig.11 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0026] Reference numerals: 1. Battery cell; 11. Explosion-proof valve; 2. Bottom plate; 21. Bottom guard plate; 22. Liquid cooling plate; 221 exhaust hole; 23. Protective block; 24. Elastic part; 25. Sliding block; 26. Movable part; 31. Acquisition module; 32. Control module; 4. Electronic device; 41. Processor; 42. Memory. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0028] Reference below Figure 1-Figure 8A bottom plate of a battery pack according to an embodiment of the present application is described.

[0029] See also Figure 1 , Figure 2 and Figure 3 The bottom plate 2 of the battery pack of the embodiment of the present application includes a bottom guard plate 21, a liquid cooling plate 22, a protection block 23 and a driving device.

[0030] The bottom guard plate 21 is located at the bottom of the entire battery pack and plays a role in protecting the internal components. The bottom guard plate 21 can be made of high-strength aluminum alloy or cast iron, with no specific thickness restrictions, and has good impact resistance.

[0031] The liquid cooling plate 22 is arranged on the upper side of the bottom guard plate 21 and is spaced apart from the bottom guard plate 21 . The liquid cooling plate 22 is used to support the battery cell 1 . An explosion-proof valve 11 is arranged at the bottom of the battery cell 1 . An exhaust hole 221 corresponding to the explosion-proof valve 11 is arranged on the liquid cooling plate 22 .

[0032] The main function of the liquid cooling plate 22 is to support the battery cell 1 and perform thermal management on the battery cell 1 through cooling liquid. Multiple cooling channels can be provided in the liquid cooling plate 22, and the coolant circulates through the cooling channels to perform thermal management on the battery cell 1. An explosion-proof valve 11 is provided at the bottom of the battery cell 1. When the internal pressure of the battery cell 1 is too high, the explosion-proof valve 11 can be automatically opened to release the pressure to prevent the battery cell 1 from exploding. An exhaust hole 221 corresponding to the explosion-proof valve 11 is provided on the liquid cooling plate 22. The position of the exhaust hole 221 is aligned with the explosion-proof valve 11, and is staggered with the cooling channel on the liquid cooling plate 22. The cross-sectional size of the exhaust hole 221 is not less than the cross-sectional size of the exhaust valve, so that the gas can be discharged smoothly when the explosion-proof valve 11 is opened.

[0033] The protection block 23 is movably disposed in the exhaust hole 221 and is spaced apart from the explosion-proof valve 11 .

[0034] The protective block 23 can be made of high-temperature resistant metal material or plastic material. The main function of the protective block 23 is to block the exhaust hole 221 under normal circumstances to prevent external impact from directly damaging the explosion-proof valve 11 through the exhaust hole 221. The protective block 23 is spaced apart from the explosion-proof valve 11 to avoid direct contact between the protective block 23 and the explosion-proof valve 11 under the action of external impact, thereby damaging the explosion-proof valve 11.

[0035] The driving device is connected to the protection block 23 and is used to drive the protection block 23 to move away from the liquid cooling plate 22 to disengage from the exhaust hole 221 when the deviation between the voltage variation trend of the battery cell 1 and the preset variation trend exceeds a threshold.

[0036] In actual implementation, under normal working conditions, the protective block 23 is located in the exhaust hole 221, shielding the exhaust hole 221, thereby protecting the explosion-proof valve 11 from external impacts, and the liquid cooling plate 22 performs thermal management on the battery cell 1 by cooling the liquid to ensure that the operating temperature of the battery cell 1 is within a safe range. When the battery cell 1 has thermal runaway or other abnormal conditions, the voltage change trend of the battery cell 1 will change significantly. When it is detected that the deviation between the voltage change trend of the battery cell 1 and the preset change trend exceeds the set threshold, the drive device will start and drive the protective block 23 to move away from the liquid cooling plate 22, so that the protective block 23 is separated from the exhaust hole 221. After the protective block 23 is separated from the exhaust hole 221, the explosion-proof valve 11 can be opened smoothly to discharge the high-temperature airflow from the bottom of the battery cell 1, so as to prevent the high-temperature airflow from impacting the busbar above the pole of the battery cell 1 and reduce the risk of high-voltage arcing and ignition.

[0037] According to the bottom plate 2 of the battery pack in the embodiment of the present application, a protective block 23 is arranged in the exhaust hole 221 so that when the bottom protective plate 21 is deformed or damaged by impact, the exhaust hole 221 will not be passed to damage the explosion-proof valve 11 at the bottom of the battery cell 1, thereby providing good physical protection for the explosion-proof valve 11 at the bottom of the battery cell 1, and when thermal runaway occurs, the protective block 23 can be controlled by a driving device to open the exhaust hole 221 to ensure smooth exhaust, thereby improving the overall safety.

[0038] See also Figure 1 and Figure 3 According to some embodiments of the present application, an elastic member 24 may be provided between the protection block 23 and the bottom guard plate 21 , and the protection block 23 may abut against the exhaust hole 221 under the action of the elastic member 24 .

[0039] The elastic member 24 can be made of a spring, a rubber pad or other elastic materials. In the present embodiment, a spiral spring is used. One end of the spiral spring is connected to the bottom guard plate 21, and the other end is connected to the protection block 23.

[0040] The elastic member 24 is installed between the protective block 23 and the bottom guard plate 21 , specifically at the lower side of the protective block 23 . When the protective block 23 is in a closed state, the elastic member 24 is compressed to generate an upward force, so that the protective block 23 is tightly abutted against the exhaust hole 221 .

[0041] In actual implementation, under normal working conditions, the elastic member 24 remains in a compressed state, providing an upward force, so that the protective block 23 always abuts against the exhaust hole 221, ensuring that the exhaust hole 221 is completely closed. When the battery cell 1 has thermal runaway or other abnormal conditions, the drive device starts and drives the protective block 23 to move in a direction away from the liquid cooling plate 22, and the elastic member 24 will be further compressed, causing the protective block 23 to be separated from the exhaust hole 221. When the drive device stops working or fails, the elastic member 24 will return to its original state, pushing the protective block 23 back into the exhaust hole 221 to ensure the sealing of the exhaust hole 221.

[0042] According to the elastic member 24 provided in the embodiment of the present application, the protection block 23 can be tightly abutted against the exhaust hole 221, ensuring that the exhaust hole 221 is closed under normal circumstances to prevent external impact from directly damaging the explosion-proof valve 11.

[0043] See also Figure 1 In some embodiments, one end of the coil spring can be fixed to the bottom guard plate 21, which can be fixed by screws or welding. The other end of the coil spring is connected to the lower side of the protective block 23, which can be connected by designing a connecting hole or a slot. The coil spring is appropriately compressed when the protective block 23 is in a closed state, providing sufficient upward force to make the protective block 23 tightly abut against the exhaust hole 221.

[0044] According to some embodiments of the present application, the driving device may include an electromagnetic device (not shown in the figure), the protective block 23 may include a magnetic block, the electromagnetic device may be arranged on the bottom guard plate 21, and the electromagnetic device may apply a suction force to the protective block 23 toward the bottom guard plate 21.

[0045] The electromagnetic device may be composed of a coil and an iron core, the coil is wound around the iron core, and when current passes through the coil, a magnetic field is generated around the iron core. The electromagnetic device is fixed on the bottom guard plate 21, and the position corresponding to the protective block 23 can be fixed by screws or welding. Among them, the electromagnetic device can be connected to the power system of the battery pack to ensure that power can be supplied in time when needed.

[0046] The magnetic block can be made of a magnetic metal material, such as a neodymium iron boron magnet. The protective block 23 can be a magnetic block as a whole, or a combination of a plastic material and a magnetic block, without specific limitation. When the electromagnetic device is powered on, the magnetic block is attracted downward, overcomes the force of the elastic member 24, and moves in a direction away from the liquid cooling plate 22, thereby separating from the exhaust hole 221.

[0047] The electromagnetic device is installed on the bottom guard plate 21, and generates a magnetic field by energizing to apply suction to the magnetic block. The protection block 23 is made of magnetic material so that it can move under the action of the magnetic field generated by the electromagnetic device.

[0048] In actual implementation, under normal working conditions, the electromagnetic device is not powered, and the magnetic block abuts against the exhaust hole 221 under the action of the elastic member 24, ensuring that the exhaust hole 221 is completely closed. When the battery cell 1 has thermal runaway or other abnormal conditions, the drive device detects that the deviation between the voltage change trend of the battery cell 1 and the preset change trend exceeds the set threshold, and the electromagnetic device is powered to generate a magnetic field, applying suction to the magnetic block toward the bottom guard plate 21. Under the suction of the electromagnetic device, the magnetic block overcomes the elastic force of the elastic member 24, moves in a direction away from the liquid cooling plate 22, and disengages from the exhaust hole 221. The explosion valve can be opened smoothly, and the high-temperature airflow is discharged from the bottom of the battery cell 1, ensuring smooth exhaust and reducing the risk of high-voltage arcing and ignition.

[0049] According to the electromagnetic device provided in the embodiment of the present application, the sealing and stability of the protective block 23 in the exhaust hole 221 are enhanced, and the function of quickly opening the exhaust hole 221 under abnormal circumstances is realized, thereby improving the overall safety of the battery pack.

[0050] See also Figure 4 and Figure 5 In some embodiments, there may be multiple exhaust holes 221, multiple protective blocks 23 corresponding to the exhaust holes 221, and multiple electromagnetic devices corresponding to the protective blocks 23, so as to drive the corresponding protective blocks 23 to move. The cloud big data system can be used for early warning, and when a battery cell 1 is abnormal or about to have thermal runaway, a command can be sent to the vehicle to directly trigger or trigger the electromagnetic device to attract the protective block 23 through the BMS (Battery Management System).

[0051] See also Figure 6 , Figure 7 and Figure 8 According to some embodiments of the present application, the driving device may include at least two movable parts 26, and the two movable parts 26 can move in directions approaching and moving away from each other. The end of the elastic part 24 away from the protective block 23 can be connected to a slider 25, and the slider 25 can slide with the two relative movable parts 26, and move in a direction approaching the battery cell 1 when the two movable parts 26 approach each other, and move in a direction away from the battery cell 1 when the two movable parts 26 move away from each other.

[0052] The movable part 26 can be a slide rail, and the sides of the two movable parts 26 close to each other can be provided with a guiding slope. The movable part 26 can be movably installed on the bottom guard plate 21, and can be driven to move by a hydraulic cylinder, an air cylinder, or a mechanical connecting rod.

[0053] The slider 25 is made of wear-resistant material, such as high molecular polymer or metal alloy, to ensure its durability in long-term use. The slider 25 is connected to the end of the elastic member 24 away from the protective block 23, and is slidably matched with the two movable members 26. The shape of the slider 25 can be designed to be able to slide freely and stably between the movable members 26.

[0054] The slider 25 can abut against the two guide slopes. When the two movable parts 26 move away from each other, the distance between the two guide slopes increases, and the slider 25 moves downward under the action of gravity, thereby driving the protection block 23 to leave the exhaust hole 221. When the two movable parts 26 approach each other, the distance between the two guide slopes decreases, and squeezes and pushes the slider 25 to move upward, so that the protection block 23 enters the exhaust hole 221.

[0055] According to some embodiments of the present application, a support plate (not shown in the figure) may be provided between the liquid cooling plate 22 and the bottom guard plate 21, the protective block 23 may be installed on the support plate and at least partially extend into the exhaust hole 221, and a driving device may be connected to the support plate to drive the support plate to move in a direction away from the liquid cooling plate 22.

[0056] It is understandable that a plurality of battery cells 1 are generally provided in the battery pack, a plurality of exhaust holes 221 corresponding to the plurality of battery cells 1 are provided on the liquid cooling plate 22 , and a plurality of protective blocks 23 corresponding to the plurality of exhaust holes 221 are also provided.

[0057] The support plate and the bottom guard plate 21 are spaced apart from each other, and a plurality of protective blocks 23 are installed on the support plate so that the support plate can drive the plurality of protective blocks 23 to move synchronously. In addition, at least part of the protective block 23 protrudes from the support plate to extend into the exhaust hole 221, thereby increasing the thickness of the physical protection at the position of the exhaust hole 221 and ensuring the structural strength of the exhaust hole 221 being blocked.

[0058] By connecting the driving device to the support plate so that the driving device can drive the support plate to move and drive all the protection blocks 23 to move together, when some battery cells 1 have thermal runaway, by opening all the exhaust holes 221 synchronously, it can be avoided that after the thermal runaway spreads, the exhaust holes 221 corresponding to other battery cells 1 are not opened, affecting normal exhaust, thereby improving overall safety.

[0059] The driving device can be a hydraulic cylinder, a pneumatic cylinder, an electric strut or an electromagnetic device, etc., without specific limitation. Taking the driving device as a hydraulic cylinder as an example, under normal working conditions, the support plate is fixed on the side close to the liquid cooling plate 22, and the support end of the hydraulic cylinder is connected to the support plate to provide support force to ensure the stability of the protective block 23. When the battery cell 1 has thermal runaway or other abnormal conditions, the hydraulic cylinder pushes the support plate to move in a direction away from the liquid cooling plate 22. As the support plate moves, all the protective blocks 23 move together in a direction away from the liquid cooling plate 22, thereby disengaging from the exhaust hole 221.

[0060] See also Figure 6 , Figure 7 and Figure 8 According to some embodiments of the present application, the size of the protective block 23 at one end close to the battery cell 1 may be smaller than the cross-sectional size of the exhaust hole 221 , and the size of the protective block 23 at one end away from the battery cell 1 may be larger than the cross-sectional size of the exhaust hole 221 .

[0061] The size of the protective block 23 near one end of the battery cell 1 is designed to be slightly smaller than the cross-sectional size of the exhaust hole 221 to ensure that it can be smoothly inserted into the exhaust hole 221 and fit tightly, and when thermal runaway occurs in the battery cell 1, the protective block 23 can quickly detach from the exhaust hole 221 and the explosion-proof valve 11 can be opened smoothly.

[0062] The size of the end of the protection block 23 away from the battery cell 1 can be larger than the cross-sectional size of the exhaust hole 221, so that the lower part of the protection block 23 and the liquid cooling plate 22 are limited and stopped, and will not pass through the exhaust hole 221 and contact the explosion-proof valve 11, thereby ensuring the stability of the protection of the protection block 23.

[0063] The shape of the protective block 23 matches the shape of the exhaust hole 221, and can be square, rectangular, circular, elliptical, etc., or can be an irregular special-shaped design, without specific limitation.

[0064] Taking the circular cross-section of the exhaust hole 221 as an example, in one example, the protective block 23 may be a truncated cone that is small at the top and large at the bottom; in another example, the upper portion of the protective block 23 may be cylindrical, and the lower end of the protective block 23 is provided with a laterally protruding truncated cone.

[0065] See also Figure 1 According to some embodiments of the present application, the height of the portion of the protection block 23 located in the exhaust hole 221 may be smaller than the height of the exhaust hole 221 .

[0066] By setting the height of the portion of the protective block 23 located in the exhaust hole 221 to be smaller than the height of the exhaust hole 221, the end of the protective block 23 is spaced from the surface of the liquid cooling plate 22 close to the battery cell 1, and further spaced from the explosion-proof valve 11 of the battery cell 1, thereby reducing the probability of the protective block 23 passing through the exhaust hole 221 and contacting the explosion-proof valve 11, thereby improving the safety of the device.

[0067] An embodiment of the present application also provides a battery, which includes a battery cell 1, a bottom plate 2 of a battery pack such as any of the above technical solutions, and a controller.

[0068] An explosion-proof valve 11 is provided at the bottom of the battery cell 1 , and the controller is electrically connected to the battery cell 1 and the driving device, and is used to control the driving device to drive the protection block 23 to move in a direction away from the liquid cooling plate 22 according to the voltage change trend of the battery cell 1 .

[0069] The battery cell 1 is the core part of the battery, which is used to store and release electrical energy. An explosion-proof valve 11 is provided at the bottom of the battery cell 1 to ensure that the internal pressure can be quickly released under abnormal circumstances to prevent the battery from exploding. The battery cell 1 is supported on the liquid cooling plate 22. It is understandable that there can be multiple battery cells 1, and the specific number is not limited. The controller is connected to the battery cell 1 to control the charging and discharging of the battery cell 1, and the controller can monitor the voltage change trend of the battery cell 1 in real time. When it is detected that the deviation between the voltage change trend of the battery cell 1 and the preset change trend exceeds the set threshold, the controller determines that the battery cell 1 may be in an abnormal state, so as to start the driving device and drive the support plate to move in a direction away from the liquid cooling plate 22, thereby driving the protective block 23 to disengage from the exhaust hole 221, so that the explosion-proof valve 11 can be opened smoothly to release the internal pressure.

[0070] It should be noted that, because the battery of the embodiment of the present application includes the bottom plate 2 of the battery pack as any of the above-mentioned technical solutions, the technical features and beneficial effects of the bottom plate 2 of the battery pack as any of the above-mentioned technical solutions are not repeated here.

[0071] See also Fig. 9 An embodiment of the present application also provides a battery control method as described in any of the above technical solutions, and the control method includes: step 100 and step 200.

[0072] Step 100, obtaining the voltage variation trend of the battery cell 1; Step 200 : When the deviation between the voltage variation trend of the battery cell 1 and the preset variation trend exceeds a threshold, control the protection block 23 corresponding to the battery cell 1 to move in a direction away from the liquid cooling plate 22 .

[0073] In step 100, a high-precision voltage sensor can be used to monitor the voltage of the battery cell 1 in real time, and the controller processes the acquired voltage data to calculate the voltage change trend of the battery cell 1. This can be achieved by comparing the current voltage value with the voltage value of the previous sampling period, or by using a more complex algorithm (such as a moving average method) to smooth the data and extract the trend.

[0074] In step 200, the controller compares the calculated voltage change trend with the preset change trend. The preset change trend can be the voltage change curve under normal working conditions, or a safety range set according to historical data and experience. Specifically, during the charging or discharging process of the vehicle over a period of time, the cloud big data combined with the AI ​​big model can be used to collect and analyze the change rules, and the preset change trend can be determined by combining the early training of the AI ​​model and self-learning. After obtaining the voltage change trend of battery cell 1, the cloud big data combined with the AI ​​big model can be used to analyze, judge and warn the state of battery cell 1, judge the abnormal change and identify the degree of risk, and issue a warning when a curve is inconsistent with the trend of other curves.

[0075] Among them, the threshold value can be adaptively adjusted according to the actual operating conditions and historical data to improve the robustness and reliability of the system. If the deviation between the calculated voltage change trend and the preset change trend exceeds the set threshold, it means that the battery cell 1 may be in an abnormal state. The controller sends a control signal to the drive device to drive the protection block 23 to move in a direction away from the liquid cooling plate 22, thereby driving the protection block 23 to break away from the exhaust hole 221, so that the explosion-proof valve 11 can be opened smoothly to release the internal pressure.

[0076] According to the battery control method provided in the embodiment of the present application, whether the battery cell 1 is in a normal working state is judged by obtaining the voltage change trend of the battery cell 1. When it is judged that the working state of the battery cell 1 deviates from normal, the protection block 23 is controlled to move in advance so that the battery cell 1 can be exhausted smoothly when thermal runaway occurs. The judgment is accurate, the battery explosion is prevented, and the overall safety of the battery is improved.

[0077] According to some embodiments of the present application, the liquid cooling plate 22 is provided with a plurality of exhaust holes 221 corresponding one-to-one to the plurality of battery cells 1 , and a plurality of protection blocks 23 are provided corresponding to the plurality of exhaust holes 221 .

[0078] When the deviation between the voltage change trend and the preset change trend exceeds a threshold, the protection block 23 corresponding to the battery cell 1 and the protection block 23 corresponding to at least one adjacent battery cell 1 are controlled to move in a direction away from the liquid cooling plate 22; or, all the protection blocks 23 are controlled to move in a direction away from the liquid cooling plate 22.

[0079] When detecting that the voltage variation trend of a certain battery cell 1 is abnormal, the controller will not only control the protection block 23 corresponding to the battery cell 1 to move in a direction away from the liquid cooling plate 22, but also control the protection block 23 corresponding to at least one adjacent battery cell 1 to perform the same action. This ensures that even if the abnormal situation spreads to the adjacent battery cells 1, the internal pressure can be released in time.

[0080] In some cases, in order to ensure the safety of the entire battery pack, the controller may choose to control all protection blocks 23 to move in a direction away from the liquid cooling plate 22. This global control strategy is suitable for more serious abnormal situations, or when the system cannot determine which battery cell 1 has a problem.

[0081] The battery control method provided in the embodiment of the present application can be executed by a battery control device. In the embodiment of the present application, the battery control device provided in the embodiment of the present application is described by taking the battery control method executed by the battery control device as an example.

[0082] An embodiment of the present application also provides a battery control device.

[0083] like Fig.10 As shown, the battery control device includes: an acquisition module 31 and a control module 32.

[0084] The acquisition module 31 is used to obtain the voltage variation trend of the battery cell 1; The control module 32 is used to control the protection block 23 corresponding to the battery cell 1 to move in a direction away from the liquid cooling plate 22 when the deviation between the voltage variation trend of the battery cell 1 and the preset variation trend exceeds a threshold.

[0085] According to the control device of the battery in the embodiment of the present application, whether the battery cell 1 is in a normal working state is determined by obtaining the voltage change trend of the battery cell 1. When it is determined that the working state of the battery cell 1 deviates from normal, the protection block 23 is controlled to move in advance so that the battery cell 1 can be exhausted smoothly when thermal runaway occurs, and the judgment is accurate and the safety is high.

[0086] The control device of the battery in the embodiment of the present application can be an electronic device, or a component in the electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal, or other devices other than a terminal. Exemplarily, the electronic device can be a mobile phone, a tablet computer, a laptop computer, a PDA, a vehicle-mounted electronic device, a mobile Internet device (Mobile Internet Device, MID), an augmented reality (augmented reality, AR) / virtual reality (virtual reality, VR) device, a robot, a wearable device, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a netbook or a personal digital assistant (personal digital assistant, PDA), etc., and can also be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (personal computer, PC), a television (television, TV), a teller machine or a self-service machine, etc., which is not specifically limited in the embodiment of the present application.

[0087] The battery control device in the embodiment of the present application may be a device having an operating system. The operating system may be a Microsoft (Windows) operating system, an Android (Android) operating system, an IOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application.

[0088] The battery control device provided in the embodiment of the present application can achieve Fig. 9 To avoid repetition, the various processes implemented by the method embodiment are not described here.

[0089] In some embodiments, Fig.11 As shown, an embodiment of the present application also provides an electronic device 4, including a processor 41, a memory 42, and a computer program stored in the memory 42 and executable on the processor 41. When the program is executed by the processor 41, each process of the above-mentioned battery control method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0090] It should be noted that the electronic devices in the embodiments of the present application include the above-mentioned mobile electronic devices and non-mobile electronic devices.

[0091] The embodiment of the present application also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the various processes of the above-mentioned battery control method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0092] The processor is the processor in the electronic device in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0093] An embodiment of the present application also provides a computer program product, including a computer program, which implements the above-mentioned battery control method when executed by a processor.

[0094] The processor is the processor in the electronic device in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0095] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface and the processor are coupled, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned battery control method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0096] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0097] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0098] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0099] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0100] In the description of the present application, “plurality” means two or more.

[0101] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0102] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0103] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0104] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A bottom plate of a battery pack, characterized in that: include: Bottom guard plate; A liquid cooling plate is arranged on the upper side of the bottom guard plate and is spaced apart from the bottom guard plate, the liquid cooling plate is used to support the battery cell, an explosion-proof valve is arranged at the bottom of the battery cell, and an exhaust hole corresponding to the explosion-proof valve is arranged on the liquid cooling plate; A protective block, movably disposed in the exhaust hole and spaced apart from the explosion-proof valve; A driving device is connected to the protection block and is used to drive the protection block to move in a direction away from the liquid cooling plate to disengage from the exhaust hole when the deviation between the voltage change trend of the battery cell and the preset change trend exceeds a threshold.

2. The bottom plate of the battery pack according to claim 1, characterized in that: An elastic member is provided between the protection block and the bottom guard plate, and the protection block abuts against the exhaust hole under the action of the elastic member.

3. The bottom plate of the battery pack according to claim 2, characterized in that: The driving device comprises an electromagnetic device, the protection block comprises a magnetic block, the electromagnetic device is arranged on the bottom protection plate, and the electromagnetic device can apply a suction force to the protection block toward the bottom protection plate.

4. The bottom plate of the battery pack according to claim 2, characterized in that: The driving device includes at least two movable parts, and the two movable parts move in directions approaching and moving away from each other. A slider is connected to the end of the elastic part away from the protective block. The slider slides with the two relative movable parts and moves in a direction approaching the battery cell when the two movable parts approach each other, and moves in a direction away from the battery cell when the two movable parts move away from each other.

5. The bottom plate of the battery pack according to claim 1, characterized in that: A support plate is provided between the liquid cooling plate and the bottom guard plate, the protection block is mounted on the support plate and at least partially extends into the exhaust hole, and the driving device is connected to the support plate for driving the support plate to move in a direction away from the liquid cooling plate.

6. The bottom plate of the battery pack according to any one of claims 1 to 5, characterized in that: The dimension of the protective block at one end close to the battery cell is smaller than the cross-sectional dimension of the exhaust hole, and the dimension of the protective block at one end away from the battery cell is larger than the cross-sectional dimension of the exhaust hole.

7. The bottom plate of the battery pack according to any one of claims 1 to 5, characterized in that: A height of a portion of the protection block located in the exhaust hole is smaller than a height of the exhaust hole.

8. A battery, characterized in that: include: A battery cell, wherein an explosion-proof valve is provided at the bottom of the battery cell; The bottom plate of the battery pack according to any one of claims 1 to 7; The controller is electrically connected to the battery cell and the driving device, and is used to control the driving device to drive the protection block to move in a direction away from the liquid cooling plate according to the voltage change trend of the battery cell.

9. A battery control method as claimed in claim 8, characterized in that: The control method comprises: Obtaining a voltage variation trend of the battery cell; When the deviation between the voltage variation trend of the battery cell and the preset variation trend exceeds a threshold, the protection block corresponding to the battery cell is controlled to move in a direction away from the liquid cooling plate.

10. The battery control method according to claim 9, characterized in that: The liquid cooling plate is provided with a plurality of exhaust holes corresponding to the plurality of battery cells one by one, and the protection block is provided with a plurality of exhaust holes corresponding to the plurality of exhaust holes; When the deviation between the voltage change trend and the preset change trend exceeds a threshold, the protective block corresponding to the battery cell and the protective block corresponding to at least one adjacent battery cell are controlled to move in a direction away from the liquid cooling plate; or, all the protective blocks are controlled to move in a direction away from the liquid cooling plate.

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