Battery pack, battery pack detection method, device and system

Abstract

The embodiment of the invention provides a battery pack, and a battery pack detection method, device and system, and relates to the technical field of battery protection. The battery pack comprises a battery unit and a bump detection unit, and the bump detection unit is arranged on at least part of the surface of the battery unit; the collision detection unit is configured to generate a signal capable of representing the collision risk level of the battery unit, and through the signal generated by the collision detection unit, collision of various levels is detected, the sensitivity of collision detection is improved, the safety state of the battery is known more comprehensively, and the safety is improved.

Description

Technical Field

[0001] The present application relates to the field of battery protection technology, and in particular to a battery pack, a battery pack detection method, a device and a system. Background Art

[0002] During the driving process of the car, it is inevitable that the chassis will be scratched and bumped, such as foreign objects such as stones on the road, rugged bad roads, ditches, and too high speed bumps. In new energy vehicles, when the battery pack is arranged close to the ground, such bottom scratches and bumps can easily damage the internal structure of the battery pack, and in severe cases, they can cause battery pack failure and fire, endangering personal safety. Therefore, the protection and monitoring of the bottom bumps of the battery pack are of great significance.

[0003] In the related art, wires are arranged at the bottom of the battery pack. When the battery pack is bumped, scratched, or squeezed, the wires may break. The battery pack condition is determined by detecting whether the wires are conductive. This method can only detect wire breakage, but cannot detect bumps that do not cause wire breakage. When a bump is detected, the severity of the bump cannot be determined, which has the problem of low sensitivity. In addition, since the specific location of the wire break cannot be determined, the specific location of the bump cannot be determined. Summary of the invention

[0004] The embodiments of the present application provide a battery pack, a battery pack detection method, a device and a system to solve the problems of low sensitivity and inability to determine the location and degree of collision.

[0005] In a first aspect, an embodiment of the present application provides a battery pack, the battery pack comprising a battery cell (10) and a bump detection unit (20), wherein the bump detection unit (20) is arranged on at least a portion of the surface of the battery cell (10);

[0006] The collision detection unit (20) is configured to generate a signal that can represent the collision risk level of the battery unit (10).

[0007] In a possible implementation, the battery unit (10) includes a battery assembly (101) and a structural member (102), the bump detection unit (20) includes a capacitor, a first electrode (201) of the capacitor is arranged on at least a portion of the surface of the battery assembly (101), and a second electrode (202) of the capacitor is arranged on the structural member (102) at a position opposite to at least a portion of the surface.

[0008] In a possible implementation, the first electrode (201) comprises a first metal sheet (2011) and a first mounting plate (2012), the first metal sheet (2011) being disposed on the first mounting plate (2012), and the first mounting plate (2012) being mounted on a side of the battery assembly (101) facing the structural member (102);

[0009] The second electrode (202) comprises a second metal sheet (2021) and a second mounting plate (2022); the second metal sheet (2021) is arranged on the second mounting plate (2022); and the second mounting plate (2022) is mounted on a side of the structural member (102) facing the battery assembly (101).

[0010] In a possible implementation manner, the surfaces of the first metal sheet (2011) and the second metal sheet (2021) are wrapped with an insulating layer.

[0011] In a possible implementation, a groove is provided on the first mounting plate (2012), and the first metal sheet (2011) is embedded in the groove of the first mounting plate (2012); a groove is provided on the second mounting plate (2022), and the second metal sheet (2021) is embedded in the groove of the second mounting plate (2022).

[0012] In a possible implementation, the first electrode (201) of the capacitor is connected to the positive electrode of the battery cell (10), and the second electrode (202) of the capacitor is connected to the negative electrode of the battery cell (10).

[0013] In a possible implementation, the collision detection unit (20) is configured such that the output current of the capacitor is a signal that can represent the collision risk level of the battery unit (10).

[0014] In a possible implementation, there are multiple collision detection units (20), and the multiple collision detection units (20) are arranged at different positions on the surface of the battery unit (10).

[0015] In a second aspect, an embodiment of the present application provides a battery pack detection method, which is applied to the battery pack in the first aspect and / or various possible implementations of the first aspect above; the method includes:

[0016] Get the output current of the capacitor;

[0017] The collision risk level of the battery unit (10) at the installation position of the collision detection unit (20) is determined according to the output current.

[0018] In a possible implementation, determining the collision risk level of the battery unit (10) at the installation position of the collision detection unit (20) according to the output current includes:

[0019] Judging whether a battery unit (10) has collided based on the output current;

[0020] When it is determined that the battery unit (10) has collided, a corresponding collision risk level is determined according to the current value.

[0021] In a possible implementation, the method further includes:

[0022] According to the collision risk level, a corresponding display instruction and / or alarm instruction is output, and the display instruction and / or alarm instruction includes the collision risk level.

[0023] In a possible implementation, when the battery pack includes a plurality of collision detection units (20), the display instruction also includes a collision position; the collision position is the installation position of the collision detection unit (20) for determining whether the battery unit (10) has collided.

[0024] In a third aspect, an embodiment of the present application provides a battery pack detection device, which is applied to a battery pack in the first aspect and / or various possible implementations of the first aspect; the device includes:

[0025] A data acquisition module, used for acquiring the output current of the capacitor;

[0026] The result determination module is used to determine the collision risk level of the battery unit (10) at the installation position of the collision detection unit (20) according to the output current.

[0027] In a fourth aspect, an embodiment of the present application provides a battery pack detection system, the system comprising a battery pack as in the first aspect and / or various possible implementations of the first aspect and a signal processing subsystem, the signal processing subsystem comprising a processor and a memory, the memory stores computer instructions, and the processor executes the computer instructions executed by the memory to implement the second aspect and / or various possible implementations of the second aspect.

[0028] In a possible implementation, the signal processing subsystem further includes a current amplifier, which is used to amplify the output current and send the amplified output current to the processor.

[0029] In a fifth aspect, an embodiment of the present application provides a vehicle, the vehicle comprising a battery pack detection system as in the fourth aspect and / or various possible implementations of the fourth aspect.

[0030] The battery pack, battery pack detection method, device and system provided in the embodiments of the present application, the battery pack includes a battery cell and a bump detection unit, the bump detection unit is arranged on at least a portion of the surface of the battery cell; the bump detection unit is configured as follows: the bump detection unit generates a signal that can characterize the risk level of bump of the battery cell, and various levels of bumps are detected through the signal generated by the bump detection unit, thereby improving the sensitivity of bump detection, more comprehensively understanding the safety status of the battery, and improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0032] Figure 1 A schematic diagram of a battery pack structure provided in an embodiment Figure 1 ;

[0033] Figure 2 A schematic diagram of a battery pack structure provided in an embodiment Figure 2 ;

[0034] Figure 3 A schematic diagram of a battery pack structure provided in an embodiment Figure 3 ;

[0035] Figure 4 A schematic diagram of a battery pack structure provided in an embodiment Figure 4 ;

[0036] Figure 5 A schematic diagram of a battery pack structure provided in an embodiment Figure 5 ;

[0037] Figure 6 A schematic diagram of a flow chart of a battery pack detection method provided in an embodiment;

[0038] Figure 7 A schematic diagram of a battery pack detection system provided in one embodiment;

[0039] Figure 8 A schematic diagram of a battery pack bottom collision detection structure provided in an embodiment.

[0040] Reference numerals:

[0041] 10: battery cell; 101: battery assembly; 102: structural member; 20: collision detection unit; 201: first electrode; 2011: first metal sheet; 2012: first mounting plate; 202: second electrode; 2021: second metal sheet; 2022: second mounting plate.

[0042] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0043] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. It is understood that the terms "first", "second", etc. used in the present application can be used to describe various information or data in this article, but these elements are not limited by these terms. These terms are only used to distinguish the first information from another information. For example, without departing from the scope of the present application, the first action information can be referred to as the second action information, and similarly, the second action information can be referred to as the first action information. Both the first action information and the second action information are action information, but they are not the same action information.

[0045] In new energy vehicles, considering the space layout and performance of the vehicle, the battery pack is usually installed under the floor in the middle or bottom of the vehicle body. The specific reasons are as follows: First, the battery pack has a large mass. Installing the battery pack under the floor in the middle or bottom of the vehicle body can lower the center of gravity of the vehicle, improve the stability and handling of the vehicle, and reduce the risk of accidents such as rollover. Secondly, in the event of a collision, the design of the battery pack needs to be coordinated with the load transfer path of the vehicle to ensure that the impact force can be effectively dispersed and absorbed to protect the battery from being squeezed and deformed. Finally, the battery system of new energy vehicles is large in size and needs to make full use of the space inside the vehicle. Laying the battery pack flat under the middle and rear floor of the vehicle can maximize the use of the space inside the vehicle, improve space utilization efficiency, and thus maximize power storage and increase the vehicle's range.

[0046] During the driving process, it is inevitable that the chassis will be scratched and bumped, for example, there are foreign objects such as stones on the road surface, rough and bad roads, ditches, and too high speed bumps. In new energy vehicles, when the battery pack is arranged close to the ground, such bottom scratches and bumps can easily damage the internal structure of the battery pack, directly affecting the safety performance of the battery pack, and in severe cases, causing battery pack failure and fire, endangering personal safety.

[0047] At present, the proposed monitoring methods have deficiencies in monitoring accuracy, stability, and functionality. For example, by arranging wires at the bottom of the battery pack, the wires may break when the battery pack is bumped, scratched, or squeezed, and the condition of the battery pack is monitored by detecting whether the wires are conductive. However, this monitoring method depends on the quality of the wires. When the bottom of the battery pack is bumped, it does not necessarily cause the wires to break. At this time, it will be impossible to determine whether the bottom of the battery pack has been bumped. Therefore, the wire method can only determine whether the battery pack has been bumped, and can only monitor bumps that cause wire breakage. It is impossible to determine the degree and location of the bump, so there are problems with insufficient sensitivity and stability.

[0048] Another example is that a sealed cavity can be set at the bottom of the battery pack, and a pressure sensor can be arranged to monitor the air pressure in the sealed cavity. When the battery pack is damaged and ruptured, the air pressure in the sealed cavity will change. By observing the change in air pressure, it is possible to monitor whether the battery pack is ruptured. This monitoring method will be affected by the external environment, such as temperature, and has the problem of insufficient stability. At the same time, this method cannot determine the specific collision location.

[0049] In response to the above technical problems, the present application proposes a battery pack, which includes a battery cell and a bump detection unit, wherein the bump detection unit is arranged on at least a portion of the surface of the battery cell; the bump detection unit monitors the collision conditions on the surface of the battery cell and generates a signal that can characterize the bump risk level of the battery cell, thereby detecting bumps of various levels, improving the sensitivity of bump detection, more comprehensively understanding the safety status of the battery, and improving safety.

[0050] In one embodiment, if Figure 1 As shown, the battery pack includes a battery cell 10 and a bump detection unit 20, and the bump detection unit 20 is arranged on at least a portion of the surface of the battery cell 10;

[0051] The collision detection unit 20 is configured as follows: the collision detection unit 20 generates a signal that can represent the collision risk level of the battery cell 10 .

[0052] In an embodiment of the present application, the bump detection unit 20 is arranged on at least a portion of the surface of the battery cell 10. The bump detection unit 20 can generate a signal that can characterize the degree of bump generated by the battery cell 10 under the collision according to the collision condition of at least a portion of the surface, thereby realizing the detection of the bump risk level of the battery cell and improving the detection sensitivity.

[0053] For example, Figure 2 As shown, the battery cell 10 is composed of a plurality of battery cells connected in series, in parallel or in series and in parallel to provide a higher power. The battery cell 10 may include a battery assembly 101 and a structural member 102. The structural member 102 is a structural system in the battery pack or a part of the structural system. The structural system is the "skeleton" of the battery pack, which is mainly composed of a battery pack cover, a tray, various metal brackets, end plates and bolts. These structural members work together to provide support, resistance to mechanical shock, mechanical vibration, and waterproof and dustproof. They are tightly surrounded by the battery assembly to ensure the stability and safety of the battery pack during installation and use.

[0054] The knock detection unit 20 is disposed on at least part of the surface of the battery cell 10, and may include at least part of the surface disposed on the side of the structural member 102 opposite to the battery assembly 101, or may include at least part of the surface disposed on the side of the battery assembly 101 opposite to the structural member 102. The battery assembly 101 may include a battery cell, a heat dissipation component, etc. The battery cell 10 may also include a shell, which may form the entire shell of the battery pack together with the structural member 102, and the shell may contain the battery cell, the heat dissipation component, the knock detection unit 20, etc.

[0055] In addition to multiple battery cells, the battery assembly 101 also includes a structure for connecting and packaging the multiple battery cells. When the bump detection unit 20 is disposed on the surface of the battery assembly 101, the bump detection unit 20 is usually disposed on the external packaging structure of the battery assembly, and an insulating layer is present between the bump detection unit 20 and the battery assembly 101 to isolate the impact of the bump detection unit 20 on the battery assembly 101.

[0056] The bump detection unit 20 is arranged on at least part of the surface of the battery unit 10, and detects the bump at the position of at least part of the surface, and generates a signal that can represent the bump risk level. Specifically, the bump detection unit 20 continuously outputs a signal, and the bump detection unit 20 is configured to change the signal output by the bump detection unit 20 if a collision occurs at the installation position of the bump detection unit 20. By detecting the degree of change of the output signal, the corresponding bump risk level is determined, thereby improving the sensitivity of the bump risk level detection.

[0057] In one embodiment, if Figure 3As shown, the collision detection unit 20 includes a capacitor C, a first electrode 201 of the capacitor C is arranged on at least a portion of the surface of the battery assembly 101, and a second electrode 202 of the capacitor is arranged on the structural member 102 at a position opposite to at least a portion of the surface.

[0058] The basic principle of the capacitor is applied in the embodiment itself, and the deformation size of the bottom of the battery pack is converted into the output current size of the capacitor in the internal current of the bump detection unit 20, so as to detect bumps of different degrees. Specifically, the first electrode 201 of the capacitor C is set on at least part of the surface of the battery assembly 101, and the second electrode 202 is set on the structural member 102 at a position opposite to at least part of the surface, and the two electrodes are mutually capacitive, forming a parallel plate capacitor.

[0059] A fixed voltage is applied between the first electrode 201 and the second electrode 202. When the capacitance value of the capacitor C remains unchanged, according to the current definition formula:

[0060] ;

[0061] And the capacitance definition:

[0062] ;

[0063] It can be seen that the current in the circuit where the capacitor C is located remains unchanged. Among them, Q is the amount of charge carried by the two electrodes, and U is the fixed voltage applied across the capacitor.

[0064] The capacitance formula of a parallel plate capacitor is:

[0065] ;

[0066] Where S is the area between the two electrodes, is the relative dielectric constant, k is the electrostatic force constant, and l is the distance between the upper and lower electrodes.

[0067] Therefore, the output current of the circuit where capacitor C is located is:

[0068] ;

[0069] in, , is the rate of change of the distance between the two electrodes. It can be seen that the output current of the capacitor is affected by the distance between the two electrodes l and the rate of change of the distance between the two electrodes v, and other parameters are constants. Specifically, the smaller the distance, the greater the output current.

[0070] The two electrodes of the capacitor are respectively distributed on the battery assembly 101 and the structural member 102, and the change in the spacing between the battery assembly 101 and the structural member 102 is monitored by the output current. The change in spacing is usually caused by collision of the battery pack, etc. Therefore, by monitoring the change in spacing, it is possible to accurately judge whether the battery pack has a collision and determine the collision risk level of the battery pack.

[0071] In one embodiment, if Figure 4 As shown, the first electrode 201 includes a first metal sheet 2011 and a first mounting plate 2012, the first metal sheet 2011 is disposed on the first mounting plate 2012, and the first mounting plate 2012 is mounted on a side of the battery assembly 101 facing the structural member 102;

[0072] The second electrode 202 includes a second metal sheet 2021 and a second mounting plate 2022 . The second metal sheet 2021 is disposed on the second mounting plate 2022 . The second mounting plate 2022 is mounted on a side of the structural member 102 facing the battery assembly 101 .

[0073] The first metal sheet 2011 and the second metal sheet 2021 are used as the plates of the capacitor C, and are made of metal materials with good electrical conductivity and carry electric charge under rated voltage. The thickness, shape and area of ​​the first metal sheet 2011 and the second metal sheet 2021 can be adjusted according to actual conditions. The first metal sheet 2011 and the second metal sheet 2021 form a parallel plate capacitor. An insulating layer is wrapped on the surface of the first metal sheet 2011 and the second metal sheet 2021. The insulating layer plays an important role in isolating electrodes, improving insulation performance, bearing electric field strength, maintaining structural stability, heat dissipation and improving voltage resistance. These functions jointly ensure the normal operation and long-term stability of the capacitor.

[0074] The first mounting plate 2012 is used to mount the metal sheet 2011 in the first electrode 201 of the capacitor C on the battery assembly 101, and the second mounting plate 2022 is used to mount the metal sheet 2021 in the second electrode 202 of the capacitor C on the structural member 102. The first mounting plate 2012 and the second mounting plate 2022 are insulating and can isolate the electrodes of the capacitor C from other structures to avoid errors caused by mutual influence.

[0075] In the capacitor electrode, the shape of the mounting plate can be flat, and the metal sheet can be directly set on the surface of the mounting plate; a groove can also be set on the mounting plate, and the metal sheet is embedded in the groove. In short, the mounting plate is used to fix the metal sheet and isolate it from other components. In addition, it is necessary to ensure that the two electrodes of the capacitor are set in parallel. The change in the distance between the two electrodes can indicate whether the battery pack is impacted by external force.

[0076] When the metal sheet is arranged on the mounting plate, a connecting wire of the metal sheet is also arranged on the mounting plate to connect the capacitor to the circuit. However, the embodiment of the present application does not specifically limit the position and shape of the connecting wire.

[0077] There is also a port or lead in the bump detection unit 20 for outputting the generated signal, that is, the output current of the capacitor C. Inside the bump detection unit 20, the output port or lead is connected to the capacitor C, and the output current of the capacitor C can be obtained. Exemplarily, the output port or lead is a probe, which is connected to the loop between the capacitor C and the rated voltage. The current in the loop is determined by the capacitor C, and the probe outputs the current in the loop as the output current.

[0078] According to the above description, when the capacitor C generates a signal that can characterize the risk level of the battery cell collision, the capacitor is in a powered state. Therefore, a power supply can be set in the collision detection unit 20 to provide a fixed voltage for the capacitor C. The first electrode 201 of the capacitor C can also be connected to the positive electrode of the battery cell 10, and the second electrode 202 of the capacitor C can be connected to the negative electrode of the battery cell 10.

[0079] It should be noted that when the capacitor C is connected to the battery unit 10, it is equivalent to connecting the capacitor C to the battery assembly 101, and the battery assembly 101 provides the rated voltage for the capacitor C. At this time, since the battery assembly 101 in the battery pack usually has a large voltage, it is necessary to use some circuit transformations to supply power to the capacitor C. Among them, the circuit for processing the output voltage of the battery assembly 101 is not specifically limited here, and the specific circuit structure can be set according to actual conditions.

[0080] In one embodiment, if Figure 5 As shown, there are multiple knock detection units 20 , and the multiple knock detection units 20 are arranged at different positions on the surface of the battery cell 10 .

[0081] Combined with the detection principle of the bump detection unit 20, one bump detection unit 20 can only detect the bump risk level of the battery cell 10 at its installation position. If the electrode area S of the capacitor C in the bump detection unit 20 is increased, the bump risk level of the entire bottom of the battery cell 10 can be detected in theory, but the bump often causes the spacing change on a small area. When the area S is larger, the impact on the current is smaller, which is not convenient for judging the size of the bump risk level according to the change in the output current. At the same time, only based on one bump detection unit 20, only the bump risk level of the battery cell 10 can be determined, and the specific bump position cannot be determined.

[0082] The electrode area of ​​the capacitor is set within a reasonable range, and multiple bump detection units 20 are set on at least part of the surface of the battery unit 10, each bump detection unit 20 corresponds to an area, and is used to generate a signal representing the bump risk level in the corresponding area. Through the signal generated by each bump detection unit 20, it is determined whether a bump occurs at its installation position and the degree of the bump; or according to the signals generated by all the bump detection units 20, the center position of the battery pack where the bump occurs is determined.

[0083] The distribution of the plurality of bump detection units 20 may be regular, for example, at least a portion of the surface of the battery unit 10 may be divided into a plurality of sub-areas at equal intervals, and a bump detection unit 20 may be installed in each sub-area to form an array. The density of the bump detection units 20 may also be increased in areas prone to scratches and collisions, and reduced in areas not prone to scratches and collisions, according to the installation position and structural characteristics of the battery pack.

[0084] In the battery pack provided in the above embodiment, a plurality of collision detection units are provided, and the specific location where the collision occurs in the battery pack can be determined according to the signals generated by the plurality of collision detection units.

[0085] The battery pack provided in the embodiment of the present application includes a battery unit and a bump detection unit, wherein the bump detection unit is arranged on at least part of the surface of the battery unit and can detect the collision at the installation position, and generate a signal that can characterize the bump risk level according to the degree of the collision, thereby improving the detection sensitivity of the battery pack bump risk level and improving safety. In addition, by setting a plurality of bump detection units, the specific location where the battery pack has a bump can be determined according to the signals generated by the plurality of bump detection units.

[0086] The present application also provides a battery pack detection method, which is applied to the above-mentioned battery pack; Figure 6 As shown, the method includes:

[0087] Step 602, obtaining the output current of the capacitor;

[0088] Step 604: Determine the collision risk level of the battery unit at the installation position of the collision detection unit according to the output current.

[0089] The output current of the capacitor obtained refers to the current value of the output current, which is a digital signal. The signal generated by the collision detection unit 20 is an analog signal. Therefore, the current output by the collision detection unit 20 needs to be converted into a digital signal by an analog-to-digital converter before determining the collision risk level.

[0090] According to the displacement detection principle of the capacitor, the smaller the spacing between the two electrodes and the greater the rate of change of the spacing, the greater the value of the output current. Combined with the installation structure of the capacitor, the smaller the spacing, the greater the deformation caused by the collision. Similarly, the greater the rate of change of the spacing, the faster the rate of collision. Therefore, the greater the current value passing through the output current, the higher the collision risk level of the battery cell at the installation position of the collision detection unit. Specifically, multiple thresholds can be set for the output current, and the range of the output current can be determined by comparing the output current with the multiple thresholds, thereby determining the corresponding collision risk level.

[0091] In the method provided in the above embodiment, the corresponding collision risk level is determined by the magnitude of the output current. Compared with judging whether a collision occurs by the on-off of the wire, the output current magnitude of the collision detection unit can effectively improve the sensitivity of the battery cell collision detection.

[0092] In one embodiment, determining the collision risk level of the battery unit at the installation position of the collision detection unit according to the output current includes:

[0093] According to the output current, determine whether the battery unit has been bumped;

[0094] When it is determined that a battery cell has collided, a corresponding collision risk level is determined based on the current value.

[0095] Among the multiple thresholds set, the smallest threshold is used as the threshold for judging whether the battery cell has collided. When the output current is greater than the threshold, it is determined that the battery cell has collided, and then the corresponding collision risk level is determined according to other thresholds; otherwise, when the output current is not greater than the threshold, it means that the battery cell has not collided, and the output current may be caused by other reasons.

[0096] Exemplarily, three thresholds I0, I1, and I2 are set, corresponding to four collision risk levels, wherein when the output current I<I0, it is determined that no collision occurs to the battery cell 10; when I0≤I<I1, the collision risk level of the battery cell 10 is determined to be dangerous; when I1≤I<I2, the collision risk level of the battery cell 10 is determined to be highly dangerous; when I2≤I, the collision risk level of the battery cell 10 is determined to be extremely dangerous.

[0097] In one embodiment, the method further comprises:

[0098] According to the collision risk level, a corresponding display instruction and / or alarm instruction is output, and the display instruction and / or alarm instruction includes the collision risk level.

[0099] In one embodiment, when the battery pack includes multiple collision detection units, the display instruction also includes a collision position; the collision position is the installation position of the collision detection unit that determines whether the battery cell has been bumped.

[0100] In the method provided in the above embodiment, the sensitivity of battery cell collision detection can be effectively improved by adjusting the output current of the collision detection unit.

[0101] Based on the same inventive concept, an embodiment of the present application also provides a battery pack detection device. The implementation solution for solving the problem provided by the device is similar to the implementation solution recorded in the above method. Therefore, the specific limitations in one or more battery pack detection device embodiments provided below can refer to the limitations on the battery pack detection method above and will not be repeated here.

[0102] In one embodiment, a battery pack detection device is provided, which is applied to the battery pack in the above embodiment; the device comprises:

[0103] A data acquisition module, used for acquiring the output current of the capacitor;

[0104] The result determination module is used to determine the collision risk level of the battery unit at the installation position of the collision detection unit according to the output current.

[0105] An embodiment of the present application also provides a battery pack detection system, which includes a battery pack as described above, a processor, and a memory, the memory stores computer instructions, and the processor executes the computer instructions executed by the memory to implement the battery pack detection method as described above.

[0106] like Figure 7 As shown, the battery pack detection system provided in this embodiment includes: a battery pack 700, a processor 701 and a memory 702. Optionally, the system also includes a communication component 703. The processor 701, the memory 702 and the communication component 703 are connected via a bus 704.

[0107] In a specific implementation process, the processor 701 executes the computer execution instructions stored in the memory 702, so that the processor 701 executes the above method.

[0108] The specific implementation process of the processor 701 can be found in the above method embodiment, and its implementation principle and technical effect are similar, so this embodiment will not be repeated here.

[0109] In the above embodiments, it should be understood that the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), etc. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc. The steps of the method disclosed in the invention may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0110] The memory may include a high-speed memory (Random Access Memory, RAM), and may also include a non-volatile memory (NVM), such as at least one disk storage.

[0111] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a signal bus, a control bus, etc. For ease of representation, the bus in the drawings of this application is not limited to only one bus or one type of bus.

[0112] In one embodiment, the system 70 further includes a current amplifier, which is used to amplify the output current and send the amplified output current to the processor.

[0113] The present application also provides a computer program product, including a computer program, which implements the above method when executed by a processor.

[0114] The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the above method is implemented.

[0115] The above-mentioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general or special-purpose computer.

[0116] An exemplary readable storage medium is coupled to a processor so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist in the device as discrete components.

[0117] The division of units is only a logical function division, and there may be other divisions in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0118] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0119] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0120] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0121] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0122] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0123] The present application also provides a vehicle, which includes the battery pack detection system as described above. Specifically, in one embodiment, a schematic diagram of the battery pack bottom collision detection structure is shown in FIG. Figure 8 As shown, the structure includes a battery pack 801, a current amplifier 802, a detection unit 803, a central processing unit 804, a display unit 805, an alarm unit 806 and a power supply 807. Among them:

[0124] Battery pack 801: i.e., the power battery assembly of an electric vehicle, specifically refers to a battery pack installed close to the ground and at risk of hitting the bottom. Battery pack 801 includes a battery unit 10 and a bump detection unit 20. The bump detection unit 20 includes a capacitor C. The capacitor C is disposed on a protective plate at the bottom of the battery unit 10 that is closest to the ground, and converts the change in the spacing between the plate and the components above it into a change in the current inside the bump detection unit 20.

[0125] Specifically, in the collision detection unit 20, the first electrode 201 and the second electrode 202 are both 0.1m×0.1m square pieces, and the facing area S of the first electrode 201 and the second electrode 202 is 0.01m 2 , the distance l between the first electrode 201 and the second electrode 202 is 0.005m, and the rated voltage U between the first electrode 201 and the second electrode 202 is 220V; the bottom of the battery pack 801 is bumped, causing the second mounting plate to move up, and the distance between the first electrode 201 and the second electrode 202 changes at a rate of 1.5m / s 2 ; then an output current of 1.17μA is generated.

[0126] Current amplifier 802: amplifies the output current of the collision detection unit 20. 6 times, and inputs a current value of 1.17 A to the detection unit 803;

[0127] The detection unit 803 , i.e., a current detection device, detects the current output by the current amplifier 802 , and inputs the output current value of the collision detection unit 20 to the central processor 804 in real time.

[0128] Central processing unit 804: The central processing unit of the automobile receives the current information from the detection unit 803, and controls the display unit 805 and the alarm unit 806; if the current value exceeds the safety threshold, it is determined that a collision has occurred at the bottom of the battery pack 801, and the collision risk level is determined according to the output current value, and the location of the collision is determined according to the position of the collision detection unit 20, and corresponding instructions are sent to the display unit 805 and the alarm unit 806; optionally, multiple levels of collision risk are set according to the current value, and after the risk level is determined, corresponding level instructions are issued.

[0129] Display unit 805: i.e., the automobile liquid crystal display screen, receives information and instructions from the central processor, and displays the collision conditions of various positions of the battery pack in real time; optionally, displays the collision risk level of the battery pack when a collision occurs.

[0130] Alarm unit 806: includes an audio alarm, a light alarm and a dashboard warning light. When the central processor 804 outputs an alarm command, the audio alarm emits a danger warning sound, the light alarm flashes a danger warning light in the car, and the dashboard battery pack danger warning light lights up; optionally, according to the risk level, the audio alarm plays respectively: battery pack 801 has a dangerous collision, battery pack 801 has a high-risk collision, and battery pack 801 has an extremely dangerous collision; optionally, according to the risk level, the light alarm flashes yellow, orange, and red lights respectively; optionally, according to the risk level, the dashboard warning lights light up the battery pack danger, high-risk, and extremely dangerous warning lights respectively.

[0131] Power supply 807: the power supply system of the whole vehicle.

[0132] It should be noted that when there are multiple knock detection units 20 in the battery pack, the detection unit 803 distinguishes all knock detection units 20 through the port corresponding to each knock detection unit 20. When the detection unit 803 sends the output current value of the knock detection unit 20 to the central processor 804, it will carry the unique identifier of the knock detection unit 20. The unique identifier is used to enable the central processor 804 to distinguish all knock detection units 20, thereby determining the knock location.

[0133] In the above-mentioned battery pack bottom bump detection structure, the bump detection unit 20 keeps generating a signal until the central processor determines that the risk level of the battery unit 10 being bumped is an extremely dangerous level, and then controls the whole vehicle to be powered off and no longer performs bump detection.

Claims

1. A battery pack, characterized in that: The battery pack comprises a battery unit (10) and a bump detection unit (20), wherein the bump detection unit (20) is arranged on at least a portion of the surface of the battery unit (10); The collision detection unit (20) is configured to generate a signal that can represent the collision risk level of the battery unit (10).

2. The battery pack according to claim 1, characterized in that: The battery unit (10) comprises a battery assembly (101) and a structural member (102); the collision detection unit (20) comprises a capacitor; a first electrode (201) of the capacitor is arranged on at least a portion of the surface of the battery assembly (101); and a second electrode (202) of the capacitor is arranged on the structural member (102) at a position opposite to the at least portion of the surface.

3. The battery pack according to claim 2, characterized in that: The first electrode (201) comprises a first metal sheet (2011) and a first mounting plate (2012), the first metal sheet (2011) being arranged on the first mounting plate (2012), and the first mounting plate (2012) being mounted on a side of the battery assembly (101) facing the structural component (102); The second electrode (202) comprises a second metal sheet (2021) and a second mounting plate (2022), wherein the second metal sheet (2021) is arranged on the second mounting plate (2022), and the second mounting plate (2022) is mounted on a side of the structural member (102) facing the battery assembly (101).

4. The battery pack according to claim 3, characterized in that: The surfaces of the first metal sheet (2011) and the second metal sheet (2021) are wrapped with an insulating layer.

5. The battery pack according to claim 3, characterized in that: The first mounting plate (2012) is provided with a groove, and the first metal sheet (2011) is embedded in the groove of the first mounting plate (2012); the second mounting plate (2022) is provided with a groove, and the second metal sheet (2021) is embedded in the groove of the second mounting plate (2022).

6. The battery pack according to claim 2, characterized in that: The first electrode (201) of the capacitor is connected to the positive electrode of the battery cell (10), and the second electrode (202) of the capacitor is connected to the negative electrode of the battery cell (10).

7. The battery pack according to any one of claims 2 to 6, characterized in that: The collision detection unit (20) is configured such that the output current of the capacitor is a signal that can represent the collision risk level of the battery unit (10).

8. The battery pack according to claim 1, characterized in that: There are a plurality of the collision detection units (20), and the plurality of the collision detection units (20) are arranged at different positions on the surface of the battery unit (10).

9. A battery pack detection method, characterized in that: The method is applied to the battery pack according to any one of claims 1 to 8; the method comprises: Get the output current of the capacitor; The collision risk level of the battery unit (10) at the installation position of the collision detection unit (20) is determined according to the output current.

10. The method according to claim 9, characterized in that Determining the collision risk level of the battery unit (10) at the installation position of the collision detection unit (20) according to the output current comprises: judging whether the battery unit (10) has collided according to the output current; When it is determined that the battery unit (10) has collided, a corresponding collision risk level is determined based on the current value.

11. The method according to claim 10, characterized in that The method further comprises: According to the collision risk level, a corresponding display instruction and / or alarm instruction is output, and the display instruction and / or alarm instruction includes the collision risk level.

12. The method according to claim 11, characterized in that In the case where the battery pack includes a plurality of collision detection units (20), the display instruction also includes a collision position; the collision position is the installation position of the collision detection unit (20) that determines whether the battery unit (10) has collided.

13. A battery pack detection device, characterized in that: The device is applied to the battery pack according to any one of claims 1 to 8; the device comprises: A data acquisition module, used for acquiring the output current of the capacitor; A result determination module is used to determine the collision risk level of the battery unit (10) at the installation position of the collision detection unit (20) according to the output current.

14. A battery pack detection system, characterized in that: The system comprises a battery pack as claimed in any one of claims 1 to 8, a processor and a memory, wherein the memory stores computer instructions, and the processor executes the computer instructions executed by the memory to implement the method as claimed in any one of claims 9 to 12.

15. The system according to claim 14, characterized in that The system further comprises a current amplifier, which is used to amplify the output current and send the amplified output current to the processor.

16. A vehicle, characterized in that: The vehicle includes a battery pack detection system as described in any one of claims 14-15.

Images