Battery management device and control method thereof, battery pack and vehicle

Abstract

The invention discloses a battery management device and a control method thereof, a battery pack and a vehicle, relates to the technical field of batteries, and aims to solve the problem of poor cycle performance of a solid-state battery. The battery management device comprises a pressure regulating piece, a pressure regulating pump and a pressure sensor. The pressure regulating part is provided with a cavity, a first connector communicated with the cavity is arranged on the pressure regulating part, and the connecting port of the pressure regulating pump is connected with the first connector on the pressure regulating part. The pressure sensor is used for detecting the pressure in the cavity, and the pressure regulating pump is used for pumping a medium into or out of the cavity based on a pressure value detected by the pressure sensor so as to regulate the volume of the pressure regulating piece, so that the pressure applied to the battery cell by the pressure regulating piece is regulated. The battery management device disclosed by the invention can be used for adjusting the pressure borne by the battery cell in the battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery management device, a control method thereof, a battery pack and a vehicle. BACKGROUND

[0002] In the field of battery application, solid-state batteries have advantages of high voltage, high energy density and long cycle life because solid-state electrolyte is used to replace the electrolyte of traditional lithium batteries. However, the existing solid-state battery cells have volume changes of expansion and contraction during the charging and discharging process, which leads to the performance degradation of the electrolyte and causes poor cycle performance of the solid-state battery. SUMMARY

[0003] The purpose of the present application is to provide a battery management device, a control method thereof, a battery pack and a vehicle, which aims to solve the problem of poor cycle performance of solid-state batteries.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] In a first aspect, the present application provides a battery management device, which comprises a pressure regulating part, a pressure regulating pump and a pressure sensor. The pressure regulating part has a cavity, and a first interface communicating with the cavity is arranged on the pressure regulating part. The connecting port of the pressure regulating pump is connected with the first interface of the pressure regulating part. The pressure sensor is used to detect the pressure in the cavity, and the pressure regulating pump is used to pump the medium into or out of the cavity based on the pressure value detected by the pressure sensor, so as to adjust the volume of the pressure regulating part and thus adjust the pressure applied by the pressure regulating part to the battery cell.

[0006] The pressure regulating pump can pump the medium into or out of the cavity to drive the pressure regulating part to expand or contract, so as to adjust the pressure borne by the battery cell. The pressure sensor can detect the pressure in the cavity, and thus feedback the pressure borne by the battery cell. In this way, during the charging and discharging process of the battery, the pressure borne by the battery cell can be monitored, and when the pressure borne by the battery cell is too small or too large, the pressure regulating part can be driven to expand or contract by the pressure regulating pump, so as to adjust the pressure borne by the battery cell to an appropriate size. In this way, during the charging and discharging process of the battery, the battery cell can be subjected to a large enough constraint force to limit the expansion and contraction of the battery cell, thereby reducing the risk of performance degradation of the electrolyte and improving the cycle performance of the battery.

[0007] In some embodiments, the pressure regulating part comprises a plurality of pressure regulating plates, and the plurality of pressure regulating plates are arranged in the thickness direction of the pressure regulating plates and are spaced apart. Two adjacent pressure regulating plates are used to arrange one battery cell. The pressure regulating plate has a sub-cavity, and the cavity of the pressure regulating part comprises the sub-cavities of the plurality of pressure regulating plates.

[0008] In some embodiments, the pressure regulating member further comprises a connecting pipe, and two sub-cavities of every two adjacent pressure regulating plates are communicated through a connecting pipe. Among them, the sub-cavity of one of the two pressure regulating plates at both ends of the pressure regulating member is communicated with the first interface along the thickness direction of the pressure regulating plate.

[0009] In some embodiments, the pressure regulating member further comprises a manifold, and the first interface is arranged on the manifold. The manifold is further provided with a plurality of branch openings, and the first interface is communicated with the plurality of branch openings. Among them, each branch opening is communicated with the sub-cavity of one pressure regulating plate.

[0010] In some embodiments, the battery management device comprises a plurality of pressure regulating members, each of which is used to adjust the pressure borne by the battery cell in the corresponding battery. Among them, the connecting port of the pressure regulating pump is connected with the plurality of first interfaces of the plurality of pressure regulating members.

[0011] In some embodiments, the battery management device further comprises a controller, and the controller is electrically connected with the pressure sensor and the pressure regulating pump. The controller is used to obtain the pressure in the cavity from the pressure sensor, and control the pressure regulating pump to pump the medium into or out of the cavity according to the pressure in the cavity.

[0012] In some embodiments, the pressure regulating member is further provided with a second interface communicated with the cavity, and the battery management device further comprises a circulating pump, a heat exchange device and a first temperature sensor. The first end of the circulating pump is connected with the first interface, and the second end of the circulating pump is connected with the second interface, so that the circulating pump and the pressure regulating member are connected to form a battery heat exchange loop, and the circulating pump is used to drive the medium to flow in the battery heat exchange loop. The first temperature sensor is used to detect the temperature of the battery cell. The heat exchange device is arranged on the battery heat exchange loop, and the heat exchange device is used to adjust the temperature of the medium in the battery heat exchange loop based on the temperature value detected by the first temperature sensor, so as to adjust the temperature of the battery cell.

[0013] In some embodiments, the heat exchange device comprises a heat exchanger, and the heat exchanger has a first heat exchange channel and a second heat exchange channel. The first heat exchange channel is connected in series in the battery heat exchange loop, and the second heat exchange channel is used to connect a heat exchange system. The heat exchanger is used to exchange heat between the medium flowing through the first heat exchange channel and the medium flowing through the second heat exchange channel.

[0014] In some embodiments, the heat exchange device comprises a heater arranged on the battery heat exchange loop. The heater is used to heat the medium in the battery heat exchange loop when the temperature of the battery cell is less than or equal to a first preset temperature.

[0015] In some embodiments, the battery management device further comprises a second temperature sensor, and the second temperature sensor is used to detect the temperature of the medium in the battery heat exchange loop. The heat exchange device is used to adjust the heat exchange power of the heat exchange device based on the temperature value detected by the second temperature sensor.

[0016] In some embodiments, the battery management device comprises a controller, which is electrically connected with the circulating pump, the first temperature sensor, and the heat exchange device. The controller is configured to acquire a temperature value of the battery cell from the first temperature sensor, and control the circulating pump and the heat exchange device to operate according to the temperature of the battery cell, so as to adjust the temperature of the medium in the battery heat exchange loop.

[0017] In some embodiments, the controller is connected with the second temperature sensor, and the controller is further configured to acquire the temperature of the medium in the battery heat exchange loop from the second temperature sensor, and control the heat exchange device to adjust the heat exchange power of the heat exchange device according to the temperature of the medium in the battery heat exchange loop.

[0018] In the second aspect, the present application provides a control method of a battery management device. The control method can be applied to the battery management device described above. The method comprises: acquiring a pressure in a cavity of a pressure regulating component in the battery management device; based on the pressure in the cavity being less than or equal to a first preset pressure, controlling a pressure regulating pump to pump the medium into the cavity, so that the pressure regulating component expands to increase the pressure borne by a battery cell; and based on the pressure in the cavity being greater than or equal to a second preset pressure, controlling the pressure regulating pump to pump the medium out of the cavity, so that the pressure regulating component shrinks to reduce the pressure borne by the battery cell. The second preset pressure is greater than the first preset pressure.

[0019] In some embodiments, the battery management device comprises a circulating pump, a first temperature sensor, and a heat exchange device. The control method further comprises: acquiring a temperature of the battery cell; based on the temperature of the battery cell being less than or equal to a first preset temperature, controlling the circulating pump to operate, and controlling the heat exchange device to heat the medium in the battery heat exchange loop; and based on the temperature of the battery cell being greater than or equal to a second preset temperature, controlling the circulating pump to operate, and controlling the heat exchange device to cool the medium in the battery heat exchange loop. The second preset temperature is greater than the first preset temperature.

[0020] In some embodiments, the heat exchange device comprises a heat exchanger. Controlling the heat exchange device to cool the medium in the battery heat exchange loop comprises: controlling the heat exchanger to cool the medium in the battery heat exchange loop.

[0021] In some embodiments, the heat exchange device further comprises a heater. Controlling the heat exchange device to heat the medium in the battery heat exchange loop comprises: controlling the heater to heat the medium in the battery heat exchange loop.

[0022] In some embodiments, controlling the heat exchange device to heat the medium in the battery heat exchange loop further comprises: determining a target heating power according to the temperature of the battery cell; and based on the maximum heating power of the heater being less than the target heating power, controlling the heat exchanger to heat the medium in the battery heat exchange loop.

[0023] In some embodiments, the battery management apparatus comprises a second temperature sensor. After the control method controls the heat exchange device to heat the medium in the battery heat exchange circuit, the control method further comprises: obtaining the temperature of the medium in the battery heat exchange circuit; and based on the temperature of the medium in the battery heat exchange circuit being greater than or equal to a first threshold, reducing the heating power of the heat exchange device.

[0024] In some embodiments, the battery management apparatus comprises a second temperature sensor. After the control method controls the heat exchange device to cool the medium in the battery heat exchange circuit, the control method further comprises: obtaining the temperature of the medium in the battery heat exchange circuit; and based on the temperature of the medium in the battery heat exchange circuit being less than or equal to a second threshold, reducing the cooling power of the heat exchange device.

[0025] In a third aspect, the present application provides a battery pack, comprising a battery and the battery management apparatus described above, the battery comprising a cell, and the pressure regulating member in the battery management apparatus is in contact with the cell.

[0026] In some embodiments, the battery further comprises a housing, the housing enclosing a containing space. The cell is disposed in the containing space, and the pressure regulating member is at least partially disposed in the containing space.

[0027] In some embodiments, the battery pack further comprises a tray, the tray having a mounting cavity, the battery is disposed in the mounting cavity, and the battery management apparatus is disposed on the tray.

[0028] In a fourth aspect, the present application provides a vehicle, comprising a vehicle body and the battery pack described above, the battery pack being disposed on the vehicle body.

[0029] The technical effects brought by any one of the implementation manners of the second aspect to the fourth aspect described above can refer to the technical effects brought by the corresponding implementation manners of the first aspect, which will not be described here again. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description can also be used to obtain other drawings without creative labor by those skilled in the art.

[0031] Figure 1 A structural diagram of a vehicle provided by the embodiments of the present application;

[0032] Figure 2 A structural diagram of a battery pack provided by the embodiments of the present application;

[0033] Figure 3 A sectional view of a battery provided by the embodiments of the present application;

[0034] Figure 4An exploded view of a battery provided for an embodiment of the present application;

[0035] Figure 5a A sectional view of a battery cell provided for an embodiment of the present application;

[0036] Figure 5b A sectional view of a battery cell provided for an embodiment of the present application; Figure 3 An enlarged view at A;

[0037] Figure 6 A structural diagram of a sub-frame provided for an embodiment of the present application;

[0038] Figure 7 A structural diagram of a housing provided for an embodiment of the present application;

[0039] Figure 8 A front view of an end plate provided for an embodiment of the present application;

[0040] Figure 9 A structural diagram of an end plate in Figure 8 A structural diagram of an end plate in

[0041] Figure 10 A structural diagram of a battery pack provided for an embodiment of the present application;

[0042] Figure 11 A structural diagram of a voltage regulating member and a battery cell provided for an embodiment of the present application;

[0043] Figure 12 An exploded view of a voltage regulating plate provided for an embodiment of the present application;

[0044] Figure 13 A structural diagram of another voltage regulating member and a battery cell provided for an embodiment of the present application;

[0045] Figure 14 A structural diagram of another voltage regulating member and a battery cell provided for an embodiment of the present application;

[0046] Figure 15 A structural diagram of a voltage regulating plate in Figure 12 A structural diagram of a voltage regulating plate in

[0047] Figure 16 A structural diagram of another battery pack provided for an embodiment of the present application;

[0048] Figure 17 A structural diagram of a voltage regulating member provided for an embodiment of the present application;

[0049] Figure 18 A top view of a voltage regulating member in Figure 17 A top view of a voltage regulating member in

[0050] Figure 19 A structural diagram of another voltage regulating member provided for an embodiment of the present application;

[0051] Figure 20 A structure diagram of a busbar provided by an embodiment of the present application;

[0052] Figure 21 A top view of a voltage regulating component in Figure 19

[0053] Figure 22 A top view of a battery provided by an embodiment of the present application;

[0054] Figure 23 Another structure diagram of a busbar provided by an embodiment of the present application;

[0055] Figure 24 A structure diagram of a battery in Figure 22

[0056] Figure 25 A hardware configuration block diagram of a battery management device provided by an embodiment of the present application;

[0057] Figure 26 One of flowcharts of a control method of a battery management device provided by an embodiment of the present application;

[0058] Figure 27 Another of flowcharts of a control method of a battery management device provided by an embodiment of the present application;

[0059] Figure 28 Another of flowcharts of a control method of a battery management device provided by an embodiment of the present application;

[0060] Figure 29 Another of flowcharts of a control method of a battery management device provided by an embodiment of the present application;

[0061] Figure 30 Another of flowcharts of a control method of a battery management device provided by an embodiment of the present application.

[0062] Reference signs:

[0063] 1000 - vehicle; 100 - vehicle body; 200 - vehicle wheel; 300 - battery pack;

[0064] 1 - battery; 11 - battery cell; 111 - pole core; 112 - aluminum plastic film; 1121 - sub film; 1121a - sealing part; 1121b - connecting part; 12 - constraint frame; 121 - sub frame; 1211 - main body part; 1212 - support part; 1212a - first sub part; 1212b - second sub part; 13 - outer shell; 131 - containing space; 14 - end plate; 141 - through hole; 15 - partition plate; 16 - protection cover; 17 - lead-out electrode;​​

[0065] 2-tray; 21-mounting cavity;

[0066] 3-battery management device; 31-pressure regulating piece; 311-cavity; 312a-first interface; 312b-second interface; 313-pressure regulating plate; 3131-subcavity; 3132-subplate; 3133-joint; 314-connection pipe; 315-converging pipe; 3151-branch; 3152-main pipe; 3153-branch pipe; 32-pressure regulating pump; 33-pressure sensor; 34-circulating pump; 35-heat exchange device; 351-heat exchanger; 352-heater; 36-first temperature sensor; 37-second temperature sensor; 38-controller;

[0067] 4-heat management system. DETAILED DESCRIPTION

[0068] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0069] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or relative position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise specified, the above orientation description can be flexibly arranged in the process of actual application, under the condition of meeting the relative position relationship shown in the drawings.

[0070] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0071] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a communication between the internal components of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0072] In embodiments of the invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0073] In embodiments of the present invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0074] In the field of battery applications, solid-state batteries have advantages such as high voltage, high energy density and long cycle life because they use solid electrolytes instead of the electrolytes in traditional lithium batteries.

[0075] Currently, solid-state batteries are widely used in electric vehicles, consumer electronics, aerospace, and energy storage systems. Especially in the electric vehicle sector, solid-state batteries are considered key to next-generation energy storage solutions, addressing some of the major limitations of current lithium-ion batteries, such as driving range and safety issues.

[0076] In related technologies, solid-state battery cells undergo volume changes during charging and discharging, including expansion and contraction. This can damage the crystalline structure of the electrolyte, leading to decreased electrolyte performance and even internal short circuits. Furthermore, it can reduce the constraint on the cell, resulting in poorer contact between electrolyte particles and between the electrolyte and the battery's positive and negative electrodes. This increases the battery's internal resistance and further reduces its charging and discharging performance. Consequently, this leads to decreased cycle life and a shortened battery life in solid-state batteries.

[0077] Based on this, see Figure 1This application provides a vehicle 1000, which can be a passenger car such as a sedan, sport utility vehicle (SUV), or multi-purpose vehicle (MPV), or a bus, truck, or semi-trailer. This application does not specifically limit the type of vehicle. Exemplarily, the vehicle 1000 includes a body 100 and wheels 200.

[0078] The vehicle body 100 has an interior cabin that can accommodate the driver and passengers or be used to load cargo. Wheels 200 can be mounted on the vehicle body 100 and play a role in rotation and support during the movement of the vehicle 1000.

[0079] It should be noted that vehicle 1000 can be a pure electric vehicle or a plug-in hybrid electric vehicle, etc., and this application does not specifically limit it. The following uses vehicle 1000 as a pure electric vehicle as an example to illustrate some embodiments of this application.

[0080] In some embodiments, see Figure 1 , Figure 1 This is a structural diagram of a vehicle 1000 provided in an embodiment of this application. The vehicle 1000 also includes a battery pack 300, which is disposed on the vehicle body 100. The battery pack 300 can provide electrical energy to the electric motor of the vehicle 1000, thereby driving the electric motor to rotate and providing power to the vehicle 1000 so that the vehicle 1000 can move.

[0081] Among them, such as Figure 2 As shown, Figure 2 This is a structural diagram of a battery pack 300 provided in an embodiment of this application. The battery pack 300 includes a battery 1, which is capable of storing electrical energy and supplying electrical energy to electrical equipment such as a generator in a vehicle 1000. For example, the battery 1 is a solid-state battery.

[0082] It should be noted that the number of batteries 1 can be one or more, and the specific number can be selected according to the actual situation. This application does not impose a specific limitation on this. For example, if there are multiple batteries 1, more batteries 1 can store more electrical energy, which can increase the vehicle's driving range by 1000.

[0083] To securely fasten the battery 1 to the vehicle body 100, the battery pack 300 may also include a tray 2, which is connected to the vehicle body 100 and has a mounting cavity 21 in which the battery 1 is disposed. In this manner, the tray 2 also provides protection for the battery 1, reducing the risk of damage to the battery 1.

[0084] In some embodiments, see Figure 3 , Figure 3This is a cross-sectional view of a battery 1 provided in an embodiment of this application. The battery 1 includes a cell 11, which is used to store and release electrical energy.

[0085] It is understood that the number of battery cells 11 can be one or more, and the specific number can be selected according to the actual situation. This application does not make a specific limitation in this regard. For example, if there are multiple battery cells 11 connected in series, the capacity of battery 1 can be increased.

[0086] Among them, such as Figure 4 As shown, Figure 4 This is an exploded view of a battery 1 provided in an embodiment of this application. The battery cell 11 can be configured as a plate, and multiple battery cells 11 can be arranged along the thickness direction of the battery cell 11.

[0087] For example, such as Figure 5a As shown, Figure 5a This is a cross-sectional view of a battery cell 11 provided in an embodiment of this application. The battery cell 11 includes an electrode core 111 and an aluminum-plastic film 112 covering the outside of the electrode core 111. In this case, the battery cell 11 can be manufactured using an aluminum-plastic film encapsulation process.

[0088] The electrode core 111 includes a positive electrode and a negative electrode arranged opposite to each other, and an electrolyte disposed between the positive electrode and the negative electrode, with the electrolyte in contact with the positive electrode and the negative electrode.

[0089] For example, such as Figure 5a As shown, the aluminum-plastic film 112 includes two interlocking sub-films 1121. Each sub-film 1121 includes an encapsulation portion 1121a and a connecting portion 1121b, with the connecting portion 1121b surrounding the encapsulation portion 1121a. The connecting portions 1121b of the two sub-films 1121 are interconnected, such that the encapsulation portions 1121a of the two sub-films 1121 form an encapsulation cavity, and the electrode core 111 is located within the encapsulation cavity.

[0090] It should be noted that the battery cell 11 may also include two tabs, which pass through the aluminum-plastic film 112 and are connected to the battery core 111. For example, the two tabs are connected to the positive and negative electrode plates respectively, for guiding the current to the outside of the battery cell 11.

[0091] It is understood that the two tabs can be located on opposite sides of the electrode core 111 or on the same side of the electrode core 111, depending on the actual situation. This application does not impose any specific limitations on this. The following describes some embodiments of this application by taking the example of two tabs located on opposite sides of the electrode core 111.

[0092] In some embodiments, see Figure 4The battery 1 also includes a constraint frame 12, which is fitted onto the cell 11 to limit the expansion of the cell 11. The constraint frame 12 may be made of a non-metallic material.

[0093] It should be noted that when there are multiple cells 11 in battery 1, there can also be multiple constraint frames 12, with one constraint frame 12 corresponding to one cell 11.

[0094] For example, such as Figure 5b As shown, Figure 5b for Figure 3 Enlarged view at point A. Constraint box 12 includes two relatively opposed sub-boxes 121 and two sub-membranes 1121 (e.g., ...). Figure 5a The connecting portion 1121b (as shown) is located between two sub-frames 121, and one sub-frame 121 is correspondingly fitted onto the encapsulation portion 1121a of one sub-film 1121 (as shown). Figure 5a As shown in the figure. In this way, during the process of assembling the constraint frame 12 onto the cell 11, interference between the connecting part 1121b of the sub-membrane 1121 and the constraint frame 12 can be prevented, which helps to reduce the assembly difficulty of the constraint frame 12 and the cell 11.

[0095] Among them, such as Figure 6 As shown, Figure 6 This is a structural diagram of the sub-frame 121 provided in an embodiment of this application. The sub-frame 121 may be configured to include a main body 1211 and a support 1212, with the main body 1211 sleeved on the encapsulation part 1121a (e.g., Figure 5a As shown, the support portion 1212 is connected to the periphery of the main body portion 1211, and the support portion 1212 is used to provide support for the electrode tab.

[0096] For example, the support portion 1212 includes a first sub-portion 1212a and a second sub-portion 1212b. The first sub-portion 1212a of the two sub-frames 121 forms a first clearance hole, and the second sub-portion 1212b of the two sub-frames 121 forms a second clearance hole. Two electrode tabs are respectively inserted into the first clearance hole and the second clearance hole. In this way, the electrode tabs can be clamped between the support portions 1212 of the two sub-frames 121, thereby providing stable support for the electrode tabs.

[0097] In some embodiments, see Figure 4 The battery 1 also includes a casing 13, which encloses a receiving space 131, within which the battery cell 11 and the constraint frame 12 are disposed. In this way, the casing 13 can protect the battery cell 11, reducing the risk of damage to the battery cell 11 and thus extending the service life of the battery 1. The casing 13 has a thin-walled structure.

[0098] For example, such as Figure 7 As shown, Figure 7The figure shows a structural diagram of a housing 13 provided by an embodiment of the present application. The housing 13 encloses a receiving space 131 with openings at both ends. For example, the cross-section of the housing 13 perpendicular to the arrangement direction of the two openings is in the shape of a Chinese character 'kou', and the housing 13 is similar to a cuboid.

[0099] It should be noted that the material of the housing 13 can be either a metal material such as aluminum alloy, titanium alloy, high-strength steel, stainless steel, or a reinforced composite material such as wound glass fiber, carbon fiber, aramid fiber, etc. The specific selection can be made according to the actual situation, and the present application does not make specific limitations on this.

[0100] In some embodiments, as Figure 4 shown, the battery 1 further includes end plates 14, and the end plates 14 are arranged in the receiving space 131. The end plates 14 and the battery cells 11 are arranged along the thickness direction of the battery cells 11, and the end plates 14 are located between the battery cells 11 and the housing 13. The housing 13 can exert a binding force on the battery cells 11 through the end plates 14 to limit the expansion of the battery cells 11.

[0101] In this way, the risk of the charge and discharge performance of the battery 1 deteriorating can be reduced, thereby improving the cycle performance of the battery 1 and extending the service life of the battery 1.

[0102] It should be noted that the number of end plates 14 can be one or two, and the specific selection can be made according to the actual situation. The present application does not make specific limitations on this.

[0103] Among them, as Figure 3 shown, when the number of end plates 14 is two, the two end plates 14 are arranged opposite to each other, and the battery cells 11 are located between the two end plates 14.

[0104] In order to smoothly and evenly transfer the expansion force of the battery cells 11 to the housing 13, the corners of the end plates 14 in contact with the housing 13 can be set as rounded corners, and the surface of the rounded corners can be set to fit the inner surface of the housing 13. At this time, as Figure 8 shown, Figure 8 The figure shows a front view of an end plate 14 provided by an embodiment of the present application. The cross-section of the end plate 14 perpendicular to the arrangement direction of the two openings of the housing 13 (as Figure 7 shown) is similar to a boat shape.

[0105] In addition, the end plate 14 can also be set as a hollow structure to reduce the weight of the end plate 14. Exemplarily, as Figure 9 shown, Figure 9 For Figure 8 the structural diagram of the end plate 14 in Figure 7 shown), one or more through holes 141 extending along the arrangement direction of the two openings of the housing 13 (as Figure 7 shown) are provided on the end plate 14.

[0106] The end plate 14 can be made of metal, for example, it can be made of extruded aluminum profile, rolled steel profile or metal CNC machined.

[0107] In some embodiments, see Figure 4 The battery 1 also includes a separator 15 disposed within the receiving space 131. The separator 15 and the cell 11 are arranged along the thickness direction of the cell 11, and the separator 15 is located between the cell 11 and the casing 13. For example, the separator 15 is located between the cell 11 and the end plate 14.

[0108] It should be noted that the number of separators 15 can be one or two, and the specific choice can be made according to the actual situation. This application does not make a specific limitation in this regard. Among them, when there are two separators 15, the two separators 15 are arranged opposite to each other, and the battery cell 11 is located between the two separators 15.

[0109] For example, such as Figure 3 As shown, the two partitions 15 are located between the two end plates 14, and the battery cell 11 is located between the two partitions 15.

[0110] The separator 15 can be made of an electrically insulating material, which can isolate the current and improve the safety performance of the battery 1.

[0111] In addition, the separator 15 can also be made of thermally insulating material. In this way, the separator 15 can play a role in heat insulation, thereby reducing the heat generated by the battery cell 11 from dissipating outward. This makes it easier to manage the heat of the battery cell 11.

[0112] In some embodiments, see Figure 4 The battery 1 also includes two protective covers 16, one of which is located at an opening, with the battery cell 11 positioned between the two protective covers 16. The protective covers 16 protect the battery cell 11, reducing the risk of damage to the battery cell 11.

[0113] In some embodiments, see Figure 4 The battery 1 also includes two lead-out electrodes 17. The two tabs of the cell 11 are respectively connected to the two lead-out electrodes 17. The lead-out electrodes 17 are adapted to lead current to the outside of the battery 1.

[0114] In some embodiments, see Figure 10 , Figure 10 This is a schematic diagram of the structure of a battery pack 300 provided in an embodiment of this application. The battery pack 300 also includes a battery management device 3, which is used to regulate the pressure borne by the battery cells 11.

[0115] For example, such asFigure 10 As shown, the battery management device 3 includes a voltage regulator 31 and a voltage regulator pump 32.

[0116] See Figure 11 , Figure 11 This is a schematic diagram of a voltage regulator 31 and a battery cell 11 provided in an embodiment of this application. The voltage regulator 31 has a cavity 311, and the voltage regulator 31 is provided with a first interface 312a communicating with the cavity 311. A voltage regulating pump 32 (such as...) Figure 10 The connection port (shown) is connected to the first interface 312a on the voltage regulator 31.

[0117] Wherein, the pressure regulating component 31 is at least partially located in the receiving space 131 (e.g. Figure 4 As shown, the pressure regulating component 31 is disposed in contact with the battery cell 11. The pressure regulating pump 32 is used to pump the medium into or out of the cavity 311 to adjust the volume of the pressure regulating component 31, thereby adjusting the pressure applied by the pressure regulating component 31 to the battery cell 11.

[0118] For example, the pressure regulating pump 32 is used to pump a medium into the cavity 311, causing the pressure regulating member 31 to expand, thereby squeezing the cell 11 of the battery 1 to increase the pressure on the cell 11 of the battery 1. The pressure regulating pump 32 is also used to pump a medium out of the cavity 311, causing the pressure regulating member 31 to contract, thereby reducing the pressure on the cell 11 of the battery 1.

[0119] It should be noted that, in order for the pressure regulating pump 32 to pump media into and out of the cavity 311, in some embodiments, the pressure regulating pump 32 can be configured to have a storage cavity, and the connection port of the pressure regulating pump 32 is connected to the storage cavity. In this way, the pressure regulating pump 32 can pump media from the storage cavity into the cavity 311, and the pressure regulating pump 32 can also pump media from the cavity 311 into the storage cavity. In other embodiments, the pressure regulating pump 32 can be connected to the storage tank via a pipeline. In this way, the pressure regulating pump 32 can pump media from the storage tank into the cavity 311, and the pressure regulating pump 32 can also pump media from the cavity 311 into the storage tank. The specific choice can be made according to the actual situation, and this application does not make specific limitations in this regard.

[0120] It is understood that the medium inside cavity 311 can be either a liquid medium or a gaseous medium, and the choice can be made according to the actual situation. This application does not make any specific limitation in this regard.

[0121] The following description uses a liquid medium within cavity 311 as an example to illustrate some embodiments of this application. The medium needs to possess one or more of the following characteristics: insulation, high boiling point, flame retardancy, non-corrosiveness, stability, low viscosity, and high specific heat.

[0122] It should be noted that the number of voltage regulators 31 in the battery management device 3 can be one or more, and the specific number can be selected according to the actual situation. This application does not make a specific limitation on this.

[0123] For example, such as Figure 10 As shown, the battery management device 3 has multiple voltage regulators 31, and the connection port of the voltage regulator pump 32 is connected to multiple first interfaces 312a of the multiple voltage regulators 31. Each voltage regulator 31 is used to adjust the pressure borne by the cell 11 in a corresponding battery 1.

[0124] In addition, such as Figure 10 As shown, the battery management device 3 may also include a pressure sensor 33, which is used to detect the pressure inside the cavity 311. Based on this, the pressure regulating pump 32 can pump a medium into or out of the cavity 311 based on the pressure value detected by the pressure sensor 33, so as to adjust the volume of the pressure regulating member 31, thereby adjusting the pressure applied by the pressure regulating member 31 to the cell 11 in the battery 1.

[0125] In this configuration, the pressure regulating pump 32 can pump a medium into or out of the cavity 311 to drive the pressure regulating component 31 to expand or contract, thereby regulating the pressure on the cell 11. The pressure sensor 33 can detect the pressure within the cavity 311, providing feedback on the pressure on the cell 11. Thus, during the charging and discharging process of the battery 1, the pressure on the cell 11 can be monitored, and if the pressure on the cell 11 is too low or too high, the pressure regulating pump 32 drives the pressure regulating component 31 to expand or contract, adjusting the pressure on the cell 11 to an appropriate level. This ensures that the cell 11 is subjected to a sufficiently large constraint force during the charging and discharging process, limiting its expansion and contraction, thereby reducing the risk of electrolyte performance degradation and improving the cycle performance of the battery 1.

[0126] In some embodiments, such as Figure 11 As shown, the voltage regulating component 31 includes multiple voltage regulating plates 313, which are spaced apart along the thickness direction of the voltage regulating plates 313, and a battery cell 11 is provided between two adjacent voltage regulating plates 313.

[0127] It should be noted that the voltage regulating plate 313 can be directly attached to the battery cell 11, or a metal plate or other component can be sandwiched between the voltage regulating plate 313 and the battery cell 11, so that the metal plate or other component between the voltage regulating plate 313 and the battery cell 11 is attached to the voltage regulating plate 313 and the battery cell 11. The specific choice can be made according to the actual situation, and this application does not make specific limitations in this regard.

[0128] The following example, taking the direct bonding of the voltage regulating plate 313 to the battery cell 11, illustrates some embodiments of this application.

[0129] Among them, such as Figure 12 As shown, Figure 12 An exploded view of a pressure regulating plate 313 provided in an embodiment of this application. The pressure regulating plate 313 has a sub-cavity 3131 and a pressure regulating component 31 (such as...). Figure 11 The cavity 311 (shown) includes multiple sub-cavities 3131 of multiple pressure regulating plates 313. For example, the multiple sub-cavities 3131 of multiple pressure regulating plates 313 are connected to form the cavity 311 of the pressure regulating member 31.

[0130] It should be noted that, as Figure 13 As shown, Figure 13 This is a schematic diagram of another voltage regulator 31 and battery cell 11 provided in an embodiment of this application. Multiple voltage regulator plates 313 can be connected in parallel. Figure 14 As shown, Figure 14 This is a schematic diagram of another voltage regulator 31 and battery cell 11 provided in an embodiment of this application. Multiple voltage regulators 313 can also be connected in series. The specific choice can be made according to the actual situation, and this application does not impose any specific limitations on this.

[0131] Based on this, the first interface 312a can be set on the pressure regulating plate 313 or on the pipeline connected to the pressure regulating plate 313. The specific choice can be made according to the actual situation, and this application does not make any specific limitation.

[0132] In this configuration, the pressure regulating pump 32 can not only pump the medium into the sub-cavity 3131 through the first interface 312a, causing the pressure regulating plate 313 to expand, but also pump the medium out of the sub-cavity 3131 through the first interface 312a, causing the pressure regulating plate 313 to contract.

[0133] In this way, when the two adjacent voltage regulating plates 313 expand, they can compress the middle cell 11, thereby increasing the constraint force on the cell 11; when the two adjacent voltage regulating plates 313 contract, they can reduce the compression on the cell 11, thereby reducing the constraint force on the cell 11. In this way, the constraint force on the cell 11 can be adjusted, which is beneficial to improving the cycle performance of the battery 1.

[0134] It should be noted that the size of the sub-cavity 3131 is not specifically limited in the embodiments of this application. For example, the boundary of the orthographic projection of the sub-cavity 3131 on the cell 11 is located on the surface where the cell 11 and the voltage regulating plate 313 are attached. Or, the orthographic projection of the sub-cavity 3131 on the cell 11 covers the surface where the cell 11 and the voltage regulating plate 313 are attached.

[0135] Specifically, by setting the orthogonal projection of the sub-cavity 3131 onto the cell 11 to cover the surface where the cell 11 and the voltage regulating plate 313 are attached, it is possible to ensure that the entire cell 11 is subjected to uniform force. In this way, the expansion and contraction of the cell 11 can be better limited during the charging and discharging process of the battery 1.

[0136] In some embodiments, such as Figure 12 As shown, the pressure regulating plate 313 includes two interlocking sub-plates 3132, and the two sub-plates 3132 form a sub-cavity 3131.

[0137] Among them, such as Figure 15 As shown, Figure 15 for Figure 12 The structural diagram of the pressure regulating plate 313 is shown. The sub-plate 3132 can be a thin metal plate, and the pressure regulating plate 313 can be formed by stamping and welding two thin metal plates.

[0138] To improve the connection strength between the two daughter boards 3132, the daughter board 3132 can be configured to include a motherboard and a connecting board surrounding the motherboard. The motherboards of the two daughter boards 3132 form a cavity 3131, and the connecting boards of the two daughter boards 3132 are fitted together.

[0139] In addition, the pressure regulating plate 313 may also include a connector 3133, which is connected to the sub-cavity 3131. Multiple pressure regulating plates 313 can be connected to each other through the connector 3133 to form a pressure regulating component 31.

[0140] In some embodiments, see Figure 10 The battery pack 300 also includes a thermal management system 4, which can exchange heat with the battery 1 to heat or cool the battery 1.

[0141] The thermal management system 4 is adapted to be connected to the air conditioning system or coolant system of the vehicle 1000, so that the temperature of the battery 1 can be regulated by the air conditioning system or coolant system to ensure that the battery 1 can work normally.

[0142] In other embodiments, such as Figure 16 As shown, Figure 16 This is a schematic diagram of another battery pack 300 provided in an embodiment of this application. The voltage regulator 31 is also provided with a second interface 312b communicating with the cavity 311, and the battery management device 3 also includes a circulation pump 34. The first end of the circulation pump 34 is connected to the first interface 312a, and the second end of the circulation pump 34 is connected to the second interface 312b, so that the circulation pump 34 and the voltage regulator 31 are connected to form a battery heat exchange circuit.

[0143] The circulating pump 34 provides power to the medium in the battery heat exchange circuit, driving the medium to flow in the battery heat exchange circuit.

[0144] Based on this, the battery management device 3 also includes a heat exchange device 35, which is disposed on the battery heat exchange circuit. The heat exchange device 35 is used to exchange heat with the medium in the battery heat exchange circuit to regulate the temperature of the medium in the battery heat exchange circuit.

[0145] In this way, when the temperature of the battery cell 11 is too high, the circulation pump 34 can be turned on, and the medium in the heat exchange circuit can be cooled through the heat exchange device 35. At this time, the cooled medium can flow into the pressure regulating component 31 under the action of the circulation pump 34, and then exchange heat with the battery cell 11 through the pressure regulating component 31 to reduce the temperature of the battery cell 11. Afterwards, the medium in the pressure regulating component 31 can flow back to the heat exchange device 35 to exchange heat with the heat exchange device 35, forming a cycle. When the temperature of the battery cell 11 is too low, the circulation pump 34 can be turned on, and the medium in the heat exchange circuit can be heated through the heat exchange device 35. At this time, the heated medium can flow into the pressure regulating component 31 under the action of the circulation pump 34, and then exchange heat with the battery cell 11 through the pressure regulating component 31 to increase the temperature of the battery cell 11. Afterwards, the medium in the pressure regulating component 31 can flow back to the heat exchange device 35 to exchange heat with the heat exchange device 35, forming a cycle.

[0146] This configuration allows for temperature regulation of the battery cell 11, enabling it to operate at a suitable temperature, which improves its charging and discharging performance and reduces the risk of malfunction.

[0147] Furthermore, the connection port of the pressure regulating pump 32 can be configured to connect to the battery heat exchange circuit, allowing the pressure regulating pump 32 to pump the medium into or out of the cavity 311 through the battery heat exchange circuit, thereby regulating the pressure borne by the cell 11. In this way, pressure and temperature regulation of the cell 11 can be achieved through the same management system. This highly integrated design simplifies the structure of the battery pack 300, reduces the number of components, lowers costs, and improves reliability while ensuring battery performance.

[0148] It should be noted that the circulating pump 34 can be a unidirectional rotary pump, in which the medium can only flow through the circulating pump 34 in one direction when the circulating pump 34 rotates. The circulating pump 34 can also be a bidirectional rotary pump, in which the medium can flow through the circulating pump 34 in one direction when the circulating pump 34 rotates in the forward direction, and in the opposite direction when the circulating pump 34 rotates in the reverse direction. The specific rotation can be determined according to actual conditions, and this application does not impose specific limitations on it.

[0149] For example, the circulation pump 34 is a bidirectional rotary pump. When the circulation pump 34 rotates in the forward direction, the medium in the battery heat exchange circuit flows from the first port 312a to the second port 312b. When the circulation pump 34 rotates in the reverse direction, the medium in the battery heat exchange circuit flows from the second port 312b to the first port 312a.

[0150] With this configuration, the circulating pump 34 can be alternately controlled to rotate in either the forward or reverse direction during the temperature regulation of the battery cell 11. This allows the medium, after exchanging heat with the heat exchanger 35, to intermittently flow into the pressure regulating element 31 through the inlet 3121 or outlet 3122, thereby exchanging heat with the battery cell 11. This results in more uniform heat exchange in the battery cell 11, helping to maintain consistent temperatures across all parts of the battery cell 11 and thus improving its performance.

[0151] In some embodiments, see Figure 17 , Figure 17 This is a structural diagram of a pressure regulating component 31 provided in an embodiment of this application. The pressure regulating component 31 includes a plurality of pressure regulating plates 313, and the plurality of pressure regulating plates 313 are arranged in series.

[0152] For example, such as Figure 18 As shown, Figure 18 for Figure 17 A top view of the pressure regulating component 31. The pressure regulating component 31 also includes multiple connecting pipes 314, and two sub-cavities 3131 of two adjacent pressure regulating plates 313 (e.g., Figure 12 (As shown) is connected via a connecting pipe 314. This configuration results in a simple structure for the pressure regulating component 31, making it easy to assemble.

[0153] Along the thickness direction of the pressure regulating plate 313, the sub-cavity 3131 of one of the two pressure regulating plates 313 located at both ends of the pressure regulating component 31 is connected to the first interface 312a; based on this, the sub-cavity 3131 of the other of the two pressure regulating plates 313 located at both ends of the pressure regulating component 31 can be configured to be connected to the second interface 312b.

[0154] In other embodiments, see Figure 19 , Figure 19 This is a structural diagram of another pressure regulating component 31 provided in an embodiment of this application. The pressure regulating component 31 includes a plurality of pressure regulating plates 313, and the plurality of pressure regulating plates 313 are arranged in parallel.

[0155] For example, the pressure regulating component 31 also includes a manifold 315, on which the first interface 312a is disposed. Figure 20 As shown, Figure 20 This is a structural diagram of a manifold 315 provided in an embodiment of this application. The manifold 315 also has multiple branch ports 3151, which are connected to a first interface 312a. Each branch port 3151 is connected to a voltage regulating plate 313 (e.g., Figure 19 The sub-cavity 3131 (as shown) is connected.

[0156] The number of manifolds 315 can be one or two, and the specific choice can be made according to the actual situation. This application does not make a specific limitation on this.

[0157] like Figure 21 As shown, Figure 21 for Figure 19 A top view of the pressure regulating component 31. When there are two manifolds 315, a pressure regulating plate 313 is connected between the two manifolds 315, and each pressure regulating plate 313 has a sub-cavity 3131 (e.g., Figure 12 (As shown) It is simultaneously connected to two manifolds 315.

[0158] Among them, see Figure 22 , Figure 22 This is a top view of a battery 1 provided in an embodiment of this application. Two manifolds 315 can be respectively disposed at two openings of the housing 13, which facilitates the connection of the pipeline to the first interface 312a on the manifold 315.

[0159] It should be noted that, see Figure 21 The pressure regulating component 31 can also be provided with a second interface 312b. The first interface 312a and the second interface 312b are provided on different manifolds 315, that is, one manifold 315 is provided with the first interface 312a, and the other manifold 315 is provided with the second interface 312b.

[0160] With this configuration, the flow resistance of the voltage regulator 31 is low, and the medium in the battery heat exchange circuit can flow more easily through the voltage regulator 31, which is beneficial to increase the flow rate of the medium, thereby improving the heat exchange efficiency and making the temperature of each part of the cell 11 more uniform.

[0161] In some embodiments, see Figure 23 , Figure 23 This is a structural diagram of another manifold 315 provided in an embodiment of this application. At least one manifold 315 includes a main pipe 3152 and a branch pipe 3153 connected to each other. A branch port 3151 is disposed on the main pipe 3152, and a first interface 312a or a second interface 312b (e.g., ...) Figure 21 (As shown) is installed on branch pipe 3153.

[0162] For example, such as Figure 23 As shown, the first interface 312a is located at one end of the branch pipe 3153, and the end of the branch pipe 3153 away from the first interface 312a is connected to the main pipe 3152.

[0163] In this way, such as Figure 24 As shown, Figure 24 for Figure 22The diagram shows the structure of battery 1. During the assembly of battery 1, the first interface 312a can be led out to the upper side of battery 1 through the branch pipe 3153, which facilitates the assembly of battery 1.

[0164] In some embodiments, see Figure 16 The heat exchange device 35 includes a heat exchanger 351, which has a first heat exchange channel and a second heat exchange channel. The first heat exchange channel is connected in series in the battery heat exchange circuit, and the second heat exchange channel is used to connect to the heat exchange system.

[0165] The heat exchanger 351 is used to exchange heat between the medium flowing through the first heat exchange channel and the medium flowing through the second heat exchange channel.

[0166] For example, the second heat exchange channel is connected to the air conditioning system of the vehicle 1000. The refrigerant in the air conditioning system can flow through the second heat exchange channel and exchange heat with the medium in the first heat exchange channel, thereby heating or cooling the medium in the battery heat exchange circuit.

[0167] In addition, the second heat exchange channel can also be connected to the coolant system of the vehicle 1000. The coolant in the coolant system can flow through the second heat exchange channel and exchange heat with the medium in the first heat exchange channel, thereby heating or cooling the medium in the battery heat exchange circuit.

[0168] In some embodiments, see Figure 16 The heat exchange device 35 includes a heater 352, which is disposed on the battery heat exchange circuit and is used to heat the medium in the battery heat exchange circuit when the temperature of the battery cell 11 is less than or equal to a first preset temperature. The heater 352 can be an electric heating device.

[0169] It should be noted that the first preset temperature can be selected according to the actual situation, and this application does not impose specific limitations on it. For example, the first preset temperature can be the lowest temperature at which the battery cell 11 can maintain high-performance operation. That is to say, if the operating temperature of the battery cell 11 is lower than the first preset temperature, the performance of the battery cell 11 will decrease significantly.

[0170] In this way, when the temperature of the battery cell 11 is too low, the circulation pump 34 can be controlled to run, and the heater 352 can be controlled to heat the medium in the battery heat exchange circuit, thereby transferring heat to the battery cell 11 through the medium, so as to heat the battery cell 11 and increase its temperature.

[0171] Understandably, heater 352 has a faster response speed. By using heater 352 to heat the medium in the battery heat exchange circuit, the temperature of cell 11 can be increased more quickly, allowing cell 11 to return to a suitable operating temperature.

[0172] In addition, when the temperature of the battery cell 11 is too low, the heat exchanger 351 can be controlled to heat the medium in the battery heat exchange circuit simultaneously. This can improve the heating efficiency and raise the temperature of the battery cell 11 more quickly, so that the battery cell 11 can be restored to a suitable operating temperature and ensure that the battery cell 11 maintains good charge and discharge performance.

[0173] In some embodiments, see Figure 16 The battery management device 3 also includes a first temperature sensor 36, which is used to detect the temperature of the battery cell 11.

[0174] For example, the heat exchange device 35 can adjust the temperature of the medium in the battery heat exchange circuit based on the temperature value detected by the first temperature sensor 36.

[0175] This facilitates the monitoring of the temperature of the battery cell 11 by the first temperature sensor 36, so that the temperature of the battery cell 11 can be adjusted by the battery management device 3 when the temperature of the battery cell 11 is too high or too low.

[0176] The battery can have multiple first temperature sensors 36, which are used to detect the temperature of different battery cells 11. In this case, if any one of the first temperature sensors 36 detects a temperature that is too high or too low, the battery management device 3 can be controlled to adjust the temperature of the battery cell 11.

[0177] In some embodiments, see Figure 16 The battery management device 3 also includes a second temperature sensor 37, which is used to detect the temperature of the medium in the battery heat exchange circuit.

[0178] For example, the heat exchange device 35 can adjust its heat exchange power based on the temperature value detected by the second temperature sensor 37.

[0179] This facilitates monitoring of the temperature of the medium in the battery heat exchange circuit via the second temperature sensor 37. This allows for adjustment of the heat exchange power of the heat exchange device 35 when the temperature of the medium in the battery heat exchange circuit is too high or too low, restoring the temperature of the medium in the battery heat exchange circuit to a suitable range and preventing damage to the battery 1 due to excessively high or low temperatures of the medium in the heat exchange circuit.

[0180] In some embodiments, see Figure 25 , Figure 25 This is a hardware configuration block diagram of a battery management device 3 provided in an embodiment of this application. The battery management device 3 also includes a controller 38, which is electrically connected to a pressure sensor 33 and a pressure regulating pump 32.

[0181] The controller 38 can obtain the pressure in the cavity 311 of the pressure regulating component 31 through the pressure sensor 33, and control the pressure regulating pump 32 to pump the medium into or out of the cavity 311 according to the pressure in the cavity 311.

[0182] In some embodiments, the controller 38 may also be electrically connected to the circulating pump 34, the first temperature sensor 36, and the heat exchange device 35.

[0183] In this case, the controller 38 can obtain the temperature value of the cell 11 from the first temperature sensor 36, and control the operation of the circulation pump 34 and the heat exchange device 35 according to the temperature of the cell 11 to regulate the temperature of the medium in the battery heat exchange circuit.

[0184] In addition, the controller 38 can also be electrically connected to the second temperature sensor 37. In this case, the controller can also obtain the temperature of the medium in the battery heat exchange circuit from the second temperature sensor 37, and control the heat exchange device 35 to adjust its own heat exchange power according to the temperature of the medium in the battery heat exchange circuit.

[0185] For example, the controller 38 may be a central processing unit (CPU), a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The controller 38 may also be other devices with processing functions, such as circuits, devices, or software modules, and the embodiments of this application do not impose any limitations on this.

[0186] This application also provides a control method for a battery management device 3, used to control the battery management device 3, and this control method can be applied to the controller 38 in the battery management device 3. Figure 26 As shown, Figure 26 This is one of the flowcharts illustrating a control method for a battery management device provided in an embodiment of this application. The control method may include the following steps:

[0187] S101. Obtain the pressure inside the cavity of the voltage regulator in the battery management device.

[0188] It is understandable that the expansion and contraction of the voltage regulator can change the pressure exerted on the battery cell. Therefore, the pressure inside the cavity of the voltage regulator can reflect the pressure exerted on the battery cell. Specifically, the pressure inside the cavity is positively correlated with the pressure exerted on the battery cell; that is, the greater the pressure inside the cavity, the greater the pressure exerted on the battery cell.

[0189] Based on this, during the charging and discharging process of the battery, the pressure inside the cavity can be obtained through a pressure sensor to monitor the pressure inside the cavity, thereby enabling the monitoring of the pressure borne by the battery cell.

[0190] S102. Based on the pressure inside the cavity being less than or equal to the first preset pressure, control the pressure regulating pump to pump the medium into the cavity.

[0191] It should be noted that the first preset pressure can be selected according to the actual situation, and this application does not impose a specific limitation on it. For example, when the pressure inside the cavity is equal to the first preset pressure, the pressure applied to the battery cell by the voltage regulator is equal to the minimum pressure that can limit the expansion of the battery cell. In other words, when the pressure inside the cavity is less than the first preset pressure, the probability of the battery cell expanding during charging and discharging will increase significantly.

[0192] In this way, when the pressure inside the cavity is less than or equal to the first preset pressure, it means that the pressure on the battery cell is relatively small, that is, the constraint force on the battery cell is insufficient.

[0193] In this situation, controlling the pressure regulating pump to pump the medium into the cavity can drive the pressure regulating component to expand, thereby increasing the pressure on the battery cell and subjecting the battery cell to a sufficiently large constraint force.

[0194] S103. Based on the pressure inside the cavity being greater than or equal to the second preset pressure, control the pressure regulating pump to pump the medium out of the cavity.

[0195] It should be noted that the second preset pressure can be selected according to the actual situation, and this application does not impose specific limitations on it. For example, when the pressure inside the cavity is equal to the second preset pressure, the pressure applied to the battery cell by the voltage regulator is equal to the maximum pressure that will not cause the battery cell to crack or deform due to compression. In other words, when the pressure inside the cavity is greater than the first preset pressure, the probability of the battery cell cracking or deforming due to compression will increase significantly.

[0196] In this way, when the pressure inside the cavity is greater than or equal to the second preset pressure, it indicates that the external pressure on the battery cell is relatively large, that is, the constraint force on the battery cell is relatively large.

[0197] In this situation, controlling the pressure regulating pump to pump the medium out of the cavity can drive the pressure regulating component to contract, thereby reducing the external pressure on the battery cell, reducing the constraint force on the battery cell, and reducing the risk of the battery cell being damaged due to excessive constraint force.

[0198] Understandably, the second preset pressure is greater than the first preset pressure. This ensures that the pressure inside the cavity is maintained between the first and second preset pressures, preventing the cell from experiencing excessive or insufficient constraint, thereby improving the cell's cycle performance and safety performance.

[0199] In some embodiments, see Figure 27 , Figure 27 This is a second schematic flowchart illustrating a control method for a battery management device provided in this application. The control method includes the following steps:

[0200] S201, Obtain the temperature of the battery cell.

[0201] During the charging and discharging process of the battery, the temperature of the battery cell can be obtained through the first temperature sensor to monitor the temperature of the battery cell.

[0202] S202. Based on the cell temperature being less than or equal to a first preset temperature, control the operation of the circulating pump and control the heat exchange device to heat the medium in the battery heat exchange circuit.

[0203] It should be noted that when there are multiple first temperature sensors, as long as the temperature detected by any one of the first temperature sensors is less than or equal to the first preset temperature, the circulating pump will be controlled to run, and the heat exchange device will be controlled to heat the medium in the battery heat exchange circuit.

[0204] The first preset temperature can be selected according to actual conditions, and this application does not impose specific limitations on it. For example, the first preset temperature can be the minimum temperature at which the battery cell can maintain high-performance operation. In other words, if the operating temperature of the battery cell is lower than the first preset temperature, the performance of the battery cell will decrease significantly.

[0205] In this way, when the temperature of the battery cell is less than or equal to the first preset temperature, it indicates that the temperature of the battery cell is low and the performance of the battery cell is poor.

[0206] In this scenario, controlling the operation of the circulating pump and controlling the heat exchange device to heat the medium in the battery heat exchange circuit allows the battery cell to be heated through the medium in the battery heat exchange circuit, thereby increasing the temperature of the battery cell and thus improving its performance.

[0207] S203. Based on the cell temperature being greater than or equal to the second preset temperature, control the operation of the circulating pump and control the heat exchange device to cool the medium in the battery heat exchange circuit.

[0208] For example, when the temperature of the battery cell is greater than or equal to a second preset temperature, the operation of the circulating pump can be controlled, and the heat exchanger can be controlled to cool the medium in the heat exchange circuit.

[0209] It should be noted that when there are multiple first temperature sensors, as long as the temperature detected by any one of the first temperature sensors is greater than or equal to the second preset temperature, the circulating pump will be controlled to run, and the heat exchange device will be controlled to cool the medium in the battery heat exchange circuit.

[0210] The second preset temperature can be selected according to actual conditions, and this application does not impose specific limitations on it. For example, the second preset temperature can be the highest temperature at which the battery cell can maintain high performance without damage. In other words, if the operating temperature of the battery cell is higher than the second preset temperature, the performance of the battery cell will decrease significantly, and the probability of battery cell failure will increase significantly.

[0211] In this way, when the temperature of the battery cell is greater than or equal to the second preset temperature, it indicates that the temperature of the battery cell is too high and there is a risk of damage to the battery cell.

[0212] In this situation, controlling the operation of the circulating pump and controlling the heat exchange device to cool the medium in the battery heat exchange circuit can cool the battery cell through the medium in the battery heat exchange circuit, thereby reducing the temperature of the battery cell and thus reducing the risk of battery cell damage.

[0213] In this process, the medium in the battery heat exchange circuit can be cooled either by a heat exchanger or by installing a cooler on the battery heat exchange circuit to cool the medium in the battery heat exchange circuit. The specific choice can be made according to the actual situation, and this application does not impose any specific limitations on it.

[0214] Understandably, the second preset temperature is higher than the first preset temperature. This allows the cell temperature to be maintained between the first and second preset temperatures, preventing the cell temperature from becoming too high or too low, thus ensuring the cell maintains high performance and reducing the risk of battery damage.

[0215] In some embodiments, see Figure 28 , Figure 28 This is the third flowchart illustrating a control method for a battery management device provided in this application. Step S202, controlling the heat exchange device to heat the medium in the battery heat exchange circuit, specifically includes the following steps:

[0216] S2021, Control the heater to heat the medium in the battery heat exchange circuit.

[0217] It should be noted that the heater has a fast response speed. When the temperature of the battery cell is less than or equal to the first preset temperature, the heater heats the medium in the battery heat exchange circuit, which can heat the battery cell more quickly, thereby shortening the time when the battery cell temperature is at a low temperature.

[0218] S2022. Determine the target heating power based on the temperature of the battery cell.

[0219] For example, the temperature of the battery cell is negatively correlated with the target heating power; that is, the lower the temperature of the battery cell, the higher the target heating power. Since the lower the temperature of the battery cell, the more heat is required to heat the battery cell to the appropriate temperature, setting the temperature of the battery cell to be negatively correlated with the target heating power and using the target heating power to heat the battery cell can heat the battery cell to the appropriate temperature more quickly.

[0220] S2023. Based on the fact that the maximum heating power of the heater is less than the target heating power, control the heat exchanger to heat the medium in the battery heat exchange circuit.

[0221] If the maximum heating power of the heater is less than the target heating power, it means that the heater is insufficient to meet the heating requirements of the battery cell. In this case, controlling the heat exchanger to synchronously heat the medium in the battery heat exchange circuit can improve the heating efficiency of the battery cell, thereby enabling the battery cell to reach the appropriate temperature more quickly.

[0222] In some embodiments, see Figure 29 , Figure 29 This is a fourth schematic flowchart illustrating a control method for a battery management device provided in an embodiment of this application. After S202, the control method further includes the following steps:

[0223] S301, Obtain the temperature of the medium in the battery heat exchange circuit.

[0224] During the heating process of the battery cell, the temperature of the medium in the battery heat exchange circuit can be obtained through a second temperature sensor to monitor the temperature of the medium in the battery heat exchange circuit.

[0225] S302. Based on the temperature of the medium in the battery heat exchange circuit being greater than or equal to a first threshold, reduce the heating power of the heat exchange device.

[0226] For example, the heating power of a heat exchange device refers to the sum of the heating power of the heat exchanger and the heating power of the heater.

[0227] The first threshold can be selected according to the actual situation, and this application does not impose specific limitations on it. For example, the first threshold refers to the highest temperature that the medium in the battery heat exchange circuit can have without causing damage to the battery.

[0228] Therefore, when the temperature of the medium in the battery heat exchange circuit is greater than or equal to the first threshold, it indicates that the temperature of the medium in the battery heat exchange circuit is too high, and there is a risk of damaging the battery.

[0229] In this case, reducing the heating power of the heat exchanger can lower the temperature of the medium in the battery heat exchange circuit, thereby reducing the risk of battery damage.

[0230] In some embodiments, seeFigure 30 , Figure 30 This is the fifth flowchart illustrating a control method for a battery management device provided in this application embodiment. After S203, the control method includes the following steps:

[0231] S401, Obtain the temperature of the medium in the battery heat exchange circuit.

[0232] During the cooling process of the battery cell, the temperature of the medium in the battery heat exchange circuit can be obtained through a second temperature sensor to monitor the temperature of the medium in the battery heat exchange circuit.

[0233] S402. Based on the fact that the temperature of the medium in the battery heat exchange circuit is less than or equal to the second threshold, reduce the cooling power of the heat exchange device.

[0234] For example, the cooling power of the heat exchange device is equal to the cooling power of the heat exchanger.

[0235] The second threshold can be selected according to the actual situation, and this application does not impose specific limitations on it. For example, the second threshold refers to the lowest temperature that the medium in the battery heat exchange circuit can have without causing damage to the battery.

[0236] Therefore, when the temperature of the medium in the battery heat exchange circuit is less than or equal to the second threshold, it indicates that the temperature of the medium in the battery heat exchange circuit is too low, and there is a risk of damaging the battery.

[0237] In this case, reducing the cooling power of the heat exchanger can increase the temperature of the medium in the battery heat exchange circuit, thereby reducing the risk of battery damage.

[0238] Understandably, the second threshold is lower than the first threshold. This ensures that the temperature of the medium in the battery heat exchange circuit is maintained between the first and second thresholds, thereby preventing the temperature of the medium in the battery heat exchange circuit from becoming too high or too low, and thus reducing the risk of battery damage.

[0239] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0240] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A battery management device, characterized in that, The battery management device (3) includes: A voltage regulator (31) has a cavity (311) and a first interface (312a) communicating with the cavity (311); the voltage regulator (31) is configured to contact the cell (11) of the battery (1); A pressure sensor (33) is used to detect the pressure inside the cavity (311); A pressure regulating pump (32) is connected to the first interface (312a) via its connection port. The pressure regulating pump (32) is used to pump medium into or out of the cavity (311) based on the pressure value detected by the pressure sensor (33) in order to adjust the volume of the pressure regulating component (31) and adjust the pressure applied by the pressure regulating component (31) to the battery cell (11).

2. The battery management device according to claim 1, characterized in that, The pressure regulating component (31) includes: Multiple voltage regulating plates (313) are spaced apart along the thickness direction of the voltage regulating plates (313), and a battery cell (11) is disposed between two adjacent voltage regulating plates (313); The pressure regulating plate (313) has a sub-cavity (3131), and the cavity (311) of the pressure regulating component (31) includes the multiple sub-cavities (3131) of the multiple pressure regulating plates (313).

3. The battery management device according to claim 2, characterized in that, The pressure regulating component (31) also includes: The two sub-cavities (3131) of each pair of adjacent pressure regulating plates (313) are connected by a connecting pipe (314); Wherein, along the thickness direction of the pressure regulating plate (313), the sub-cavity (3131) of one of the two pressure regulating plates (313) located at both ends of the pressure regulating member (31) is connected to the first interface (312a).

4. The battery management device according to claim 2, characterized in that, The pressure regulating component (31) also includes: A manifold (315) is provided with the first interface (312a) disposed on the manifold (315); the manifold (315) is also provided with a plurality of branch ports (3151), and the first interface (312a) is connected to the plurality of branch ports (3151); Each of the branch ports (3151) is connected to a sub-cavity (3131) of one of the pressure regulating plates (313).

5. The battery management device according to any one of claims 1-4, characterized in that, The battery management device (3) includes a plurality of voltage regulators (31), each voltage regulator (31) being used to adjust the pressure borne by the cell (11) in one of the batteries (1); The connection port of the pressure regulating pump (32) is connected to multiple first interfaces (312a) of multiple pressure regulating components (31).

6. The battery management device according to any one of claims 1-4, characterized in that, The battery management device (3) further includes: A controller (38) is electrically connected to the pressure sensor (33) and the pressure regulating pump (32); the controller (38) is used to obtain the pressure in the cavity (311) from the pressure sensor (33) and control the pressure regulating pump (32) to pump the medium into or out of the cavity (311) according to the pressure in the cavity (311).

7. The battery management device according to any one of claims 1-4, characterized in that, The pressure regulating component (31) is also provided with a second interface (312b) that communicates with the cavity (311); The battery management device (3) further includes: A circulating pump (34) is provided, with its first end connected to the first interface (312a) and its second end connected to the second interface (312b), such that the circulating pump (34) and the pressure regulating component (31) are connected to form a battery heat exchange circuit; the circulating pump (34) is used to drive the medium to flow in the battery heat exchange circuit. A first temperature sensor (36) is used to detect the temperature of the battery cell (11); A heat exchange device (35) is provided on the battery heat exchange circuit; the heat exchange device (35) is used to adjust the temperature of the medium in the battery heat exchange circuit based on the temperature value detected by the first temperature sensor (36) in order to adjust the temperature of the battery cell (11).

8. The battery management device according to claim 7, characterized in that, The heat exchange device (35) includes: The heat exchanger (351) has a first heat exchange channel and a second heat exchange channel. The first heat exchange channel is connected in series in the battery heat exchange circuit, and the second heat exchange channel is used to connect the heat exchange system. The heat exchanger (351) is used to exchange heat between the medium flowing through the first heat exchange channel and the medium flowing through the second heat exchange channel.

9. The battery management device according to claim 8, characterized in that, The heat exchange device (35) further includes: Heater (352), the heater (352) is disposed on the battery heat exchange circuit; the heater (352) is used to heat the medium in the battery heat exchange circuit when the temperature of the battery cell (11) is less than or equal to a first preset temperature.

10. The battery management device according to claim 7, characterized in that, The battery management device (3) further includes: The second temperature sensor (37) is used to detect the temperature of the medium in the battery heat exchange circuit; the heat exchange device (35) is used to adjust the heat exchange power of the heat exchange device (35) based on the temperature value detected by the second temperature sensor (37).

11. The battery management device according to claim 10, characterized in that, The battery management device (3) further includes: A controller (38) is electrically connected to the circulating pump (34), the first temperature sensor (36), and the heat exchange device (35). The controller (38) is used to obtain the temperature value of the battery cell (11) from the first temperature sensor (36) and control the operation of the circulating pump (34) and the heat exchange device (35) according to the temperature of the battery cell (11) to adjust the temperature of the medium in the battery heat exchange circuit.

12. The battery management device according to claim 11, characterized in that, The controller (38) is electrically connected to the second temperature sensor (37); the controller (38) is also used to obtain the temperature of the medium in the battery heat exchange circuit from the second temperature sensor (37), and control the heat exchange device (35) to adjust its own heat exchange power according to the temperature of the medium in the battery heat exchange circuit.

13. A control method for a battery management device, characterized in that, The control method, applied to the battery management device as described in any one of claims 1 to 12, comprises: Obtain the pressure inside the cavity of the voltage regulator in the battery management device; Based on the fact that the pressure inside the cavity is less than or equal to the first preset pressure, the pressure regulating pump is controlled to pump the medium into the cavity, causing the pressure regulating component to expand, thereby increasing the pressure that the battery cell can withstand. Based on the pressure inside the cavity being greater than or equal to the second preset pressure, the pressure regulating pump is controlled to pump the medium out of the cavity, causing the pressure regulating component to contract, thereby reducing the pressure on the battery cell. The second preset pressure is greater than the first preset pressure.

14. The control method for the battery management device according to claim 13, characterized in that, The battery management device includes a circulation pump, a first temperature sensor, and a heat exchange device; The control method further includes: Obtain the temperature of the battery cell; Based on the temperature of the battery cell being less than or equal to a first preset temperature, the circulation pump is controlled to operate, and the heat exchange device is controlled to heat the medium in the battery heat exchange circuit. If the temperature of the battery cell is greater than or equal to the second preset temperature, the circulation pump is controlled to operate, and the heat exchange device is controlled to cool the medium in the battery heat exchange circuit. The second preset temperature is greater than the first preset temperature.

15. The control method for the battery management device according to claim 14, characterized in that, The heat exchange device includes a heat exchanger; The control of the heat exchange device to cool the medium in the battery heat exchange circuit includes: The heat exchanger is controlled to cool the medium in the battery heat exchange circuit.

16. The control method for the battery management device according to claim 15, characterized in that, The heat exchange device also includes a heater; The control of the heat exchange device to heat the medium in the battery heat exchange circuit includes: The heater is controlled to heat the medium in the battery heat exchange circuit.

17. The control method for the battery management device according to claim 16, characterized in that, The method of controlling the heat exchange device to heat the medium in the battery heat exchange circuit further includes: The target heating power is determined based on the temperature of the battery cell; Based on the fact that the maximum heating power of the heater is less than the target heating power, the heat exchanger is controlled to heat the medium in the battery heat exchange circuit.

18. The control method for the battery management device according to any one of claims 14-17, characterized in that, The battery management device includes a second temperature sensor; After controlling the heat exchange device to heat the medium in the battery heat exchange circuit, the control method further includes: Obtain the temperature of the medium in the battery heat exchange circuit; The heating power of the heat exchange device is reduced based on the temperature of the medium in the battery heat exchange circuit being greater than or equal to a first threshold.

19. The control method for the battery management device according to any one of claims 14-17, characterized in that, The battery management device includes a second temperature sensor; After controlling the heat exchange device to cool the medium in the battery heat exchange circuit, the control method further includes: Obtain the temperature of the medium in the battery heat exchange circuit; The cooling power of the heat exchange device is reduced based on the temperature of the medium in the battery heat exchange circuit being less than or equal to a second threshold.

20. A battery pack, characterized in that, include: Battery (1), the battery (1) comprising a cell (11); The battery management device (3) according to any one of claims 1-12, wherein the voltage regulator (31) in the battery management device (3) is disposed in contact with the battery cell (11).

21. The battery pack according to claim 20, characterized in that, The battery (1) also includes: The outer casing (13) surrounds a receiving space (131); the battery cell (11) is disposed within the receiving space (131), and the voltage regulator (31) is at least partially disposed within the receiving space (131).

22. The battery pack according to claim 20, characterized in that, The battery pack (300) also includes: The tray (2) has a mounting cavity (21) in which the battery (1) is disposed; the battery management device (3) is disposed on the tray (2).

23. A vehicle, characterized in that, include: Body (100); The battery pack (300) according to any one of claims 20-22, wherein the battery pack (300) is disposed on the vehicle body (100).

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