Collision detection device and detection method, battery pack and electric equipment

Abstract

The embodiment of the invention provides a collision detection device and method, a battery pack and electric equipment, and relates to the technical field of energy storage. The collision detection device is used for a battery pack, and comprises an electrode assembly which comprises at least two electrode parts which are oppositely arranged and is used for forming a detection loop; the resistor assembly is provided with a detection part, and in the resistor assembly, at least the detection part is arranged between the at least two electrode pieces; the collision detection device is configured to be in contact conduction with the at least one electrode piece when the collision detection device is subjected to external force, so that a detection signal is formed in the detection loop. According to the invention, the collision damage state of the whole to-be-detected area of the battery pack can be accurately and efficiently identified.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a collision detection device and detection method, a battery pack, and electrical equipment. Background Art

[0002] With the increasing popularity of new energy vehicles, the performance requirements for power batteries in new energy vehicles are becoming higher and higher. As a key component of new energy vehicles, the safety performance of batteries is the most important performance.

[0003] When a car is driving, facing complex road conditions, the bottom guard plate of the power battery will inevitably be bumped, deformed, dented, or even punctured. The driver usually continues to drive without knowing it. Once the battery cell itself is damaged, it is easy to cause serious consequences.

[0004] At present, there are two mainstream detection schemes on the market for the detection of collision damage on the bottom of power batteries: the first scheme is to use methods such as electrical conduction circuit detection and pressure sensor detection to determine whether the bottom of the battery is damaged; the second scheme is to use a multi-sensor detection device to identify the area at the bottom of the battery pack that has been hit and the degree of the collision.

[0005] However, the above two detection schemes only detect a small local area of ​​the battery and cannot accurately identify the damage status such as the damage degree and damage location of the entire detection area of ​​the battery pack. Summary of the invention

[0006] The embodiments of the present application provide a collision detection device and detection method, a battery pack, and an electrical device, which can accurately and efficiently identify the collision damage status of the entire area to be inspected of the battery pack.

[0007] In a first aspect, an embodiment of the present application provides a collision detection device for a battery pack, the collision detection device comprising:

[0008] An electrode assembly, comprising at least two electrode members arranged opposite to each other, wherein the at least two electrode members are used to form a detection circuit;

[0009] A resistor assembly, the resistor assembly having a detection portion, wherein at least the detection portion is disposed between at least two of the electrode members;

[0010] The collision detection device is configured such that when an external force is applied, the detection portion contacts and conducts with at least one of the electrode members to form a detection signal in the detection circuit.

[0011] In a possible implementation manner, the resistor assembly includes a resistor component and an insulating component;

[0012] The resistor and the insulating member are arranged opposite to each other, a through hole is formed on the insulating member, the detection part is arranged on the resistor, and the through hole is used for the detection part to pass through.

[0013] In a possible implementation, there are a plurality of through holes and a plurality of detection parts, and the through holes and the detection parts are arranged in an array and are disposed in a one-to-one correspondence.

[0014] In a possible implementation, the resistor has a detection base point, and along a first direction and away from the detection base point, the resistance value of the detection portion has an increasing trend, and the first direction is parallel to an extension direction of the resistor.

[0015] In a possible implementation manner, along the first direction and away from the detection base point, the resistance value gradually increases.

[0016] In a possible implementation, along a second direction away from the detection base point, the resistance value has an increasing trend, and the second direction is parallel to an extension direction of the resistor and is arranged at an angle to the first direction.

[0017] In a possible implementation, the resistor is a rectangular plate, the detection base point is located at a vertex corner of one side of the rectangular plate, the first direction is the long side direction of the rectangular plate, and the second direction is the short side direction of the rectangular plate.

[0018] In a possible implementation, there are multiple detection parts, and the multiple detection parts are arranged in an array;

[0019] The detection portion is a protrusion arranged on the resistor.

[0020] In a possible implementation manner, the height of the protrusion is not less than 60% of the depth of the through hole.

[0021] In a possible implementation manner, the insulating member includes an insulating main board, and the through hole is provided on the insulating main board; the orthographic projection of the resistor on the surface where the insulating main board is located is covered by the insulating main board;

[0022] The insulating member comprises an insulating connecting plate, and the insulating connecting plate is connected to one side of the insulating main plate; the orthographic projection of the resistor on the surface where the insulating connecting plate is located is staggered with the insulating connecting plate;

[0023] The insulating connecting plate is used to correspond to the reinforcing plate of the battery pack.

[0024] In a possible implementation manner, a first connector is provided on the insulating connecting plate, and the first connector is used to connect the insulating connecting plate and the reinforcing plate.

[0025] In a possible implementation, there are a plurality of insulating main boards, which are arranged in an array, and two adjacent insulating main boards are connected via the insulating connecting plate; there are a plurality of electrode members, which are arranged in an array at intervals;

[0026] One of the electrode members corresponds to one of the insulating main boards.

[0027] In a possible implementation manner, the electrode member includes an electrode portion and an electrode connecting portion, the electrode connecting portion is connected to one side of the electrode portion, and the orthographic projection of the detection portion on the surface where the electrode member is located is covered by the electrode portion;

[0028] The collision detection device is configured such that when an external force is applied, the detection portion contacts and conducts with the electrode portion.

[0029] In a possible implementation manner, a second connector is provided on the electrode connecting portion, and the second connector is used to connect the electrode connecting portion and a reinforcing plate of the battery pack.

[0030] In a possible implementation, there are a plurality of electrode parts, the plurality of electrode parts are arranged in an array, and adjacent electrode parts are connected via the electrode connecting part.

[0031] In a possible implementation manner, the electrode member is an aluminum foil electrode member.

[0032] In a possible implementation manner, the electrode element has a thickness of 50 μm to 1000 μm.

[0033] In a second aspect, an embodiment of the present application provides a battery pack, comprising a battery, a bottom guard plate, and a collision detection device as described in any one of the above items, wherein the collision detection device is arranged between the battery and the bottom guard plate.

[0034] In a possible implementation, the reinforcing member of the battery is connected to the first connecting member of the insulating connecting plate and / or the second connecting member of the electrode connecting portion.

[0035] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery pack as described above.

[0036] In a fourth aspect, the application embodiment provides a battery pack collision detection method, which is used in any of the collision detection devices described above, comprising the steps of:

[0037] Acquire a detection signal of a detection circuit;

[0038] The deformation amount of the battery pack is determined according to the detection signal and the mapping relationship between the detection signal and the deformation amount.

[0039] In a possible implementation manner, after determining the deformation amount of the battery pack, the method further includes:

[0040] Compare the deformation amount with the preset deformation amount;

[0041] When the deformation is greater than the preset deformation, an alarm message is generated.

[0042] In a possible implementation manner, the detection signal includes detection signals of a plurality of the detection units;

[0043] After determining the actual deformation of the battery pack, it also includes:

[0044] According to the detection signals of the plurality of detection units, the positions of the detection units are determined.

[0045] The collision detection device and detection method, battery pack, and electrical equipment provided by the embodiment of the present application, the collision detection device is used for the battery pack, and is arranged between the battery and the bottom guard plate, and includes: an electrode assembly and a resistor assembly, the electrode assembly includes at least two electrode parts arranged opposite to each other, and the at least two electrode parts form a detection circuit, and the resistor assembly has a detection part, and in the resistor assembly, at least the detection part is arranged between the at least two electrode parts. When the bottom guard plate of the battery pack or other positions on the battery pack is subjected to a collision and squeezes the collision detection device and causes the resistor part to deform, the detection part on the resistor part is in contact with the electrode part and is connected, and a detection signal is formed in the detection circuit, and a deformation amount parameter is preset in the detection system that is connected to the electrode assembly to form a detection circuit. According to the detection signal, and the mapping relationship between the detection signal and the deformation amount in the detection system, information including the deformation amount and / or deformation position of the battery pack can be determined, so that the collision damage position and the degree of collision damage corresponding to the overall area of ​​the battery to be detected can be identified, and the collision damage conditions such as the collision damage position and the collision damage degree can be realized, so as to realize accurate, efficient, and real-time detection of collision damage of the battery pack, and the structure is simple, the installation is convenient, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] 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.

[0047] Figure 1 An exploded diagram of a collision detection device provided in an embodiment of the present application;

[0048] Figure 2 A schematic diagram of a resistor and a through hole in a collision detection device provided in an embodiment of the present application;

[0049] Figure 3 A schematic diagram of the structure of a resistor provided in an embodiment of the present application;

[0050] Figure 4A top view of a resistor provided in an embodiment of the present application;

[0051] Figure 5 An exploded view of the battery pack provided for this application;

[0052] Figure 6 A flowchart of the battery pack collision detection method provided in this application.

[0053] Among them, 1-battery pack;

[0054] 10-collision detection device, 20-battery, 30-bottom guard plate, 40-reinforcement plate, 50-rubber strip;

[0055] 11-electrode assembly, 12-resistance assembly;

[0056] 111-electrode member, 121-insulating member, 122-resistance member;

[0057] 1111 - electrode part, 1112 - electrode connecting part, 1211 - through hole, 1212 - insulating connecting plate, 1213 - insulating main board, 1221 - detection part.

[0058] 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

[0059] 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.

[0060] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right", "front", "rear" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0061] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0062] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is smaller in level than the second feature.

[0063] As mentioned above, the collision detection device in the related art usually adopts multi-sensor detection, pressure sensor combined with pressure tube detection, etc. Due to the limitation of the sensor layout position, it is impossible to accurately identify the specific collision area and degree of collision of the battery pack, and it can only perform detection on a small local area. The use of multi-sensor synchronous measurement to increase the detection range and improve the detection accuracy increases the system complexity and increases the detection cost.

[0064] In view of this, the collision detection device structure provided in the present application can identify the deformation area and degree by detecting the resistance distribution of the detection part. When the battery pack is hit, the impacted area and the impact degree are determined by detecting the distribution of the resistance value, so as to realize the real-time detection of the collision damage within the entire range of the set detection area including the bottom. In addition, the present application only requires the detection system to collect the position distribution of the turned-on detection part and calculate the total resistance of the turned-on detection part. Compared with the detection scheme using multiple sensors in the prior art, the structure of the present application is simpler, the detection is more convenient, the detection accuracy is higher, the efficiency is higher, and the detection cost is lower.

[0065] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0066] refer to Figure 1 and Figure 2The embodiment of the present application provides a collision detection device, which is used to detect the collision damage area and / or collision damage degree within the range of the to-be-detected area of ​​the battery pack. The to-be-detected area can be the bottom of the battery pack, the top of the battery pack, the side of the battery pack, etc. It can be a certain outer surface of the battery pack, or a certain set area on the outer surface of the battery pack, or it can be the inside of the battery pack, usually the bottom of the battery pack.

[0067] The collision detection device in the present application includes an electrode assembly 11, and the electrode assembly 11 is provided with at least two electrode members that are relatively distributed. The at least two electrode members can be connected to the electrode end of the detection system through a wire to form a detection circuit in a conductive state.

[0068] The collision detection device further includes a resistor component 12 , and the resistor component 12 is provided with a plurality of detection parts 1221 . On the resistor component 12 , at least the detection part is arranged between at least two electrode members.

[0069] The collision detection device of the present application determines the actual deformation degree by comparing it with the deformation degree built into the detection system. Similarly, the "collision area" is identified by comparing it with the deformation area built into the detection system.

[0070] When there is no external force collision or compression or the collision and compression do not reach the predetermined detection conditions, the detection part 1221 on the resistor component 12 is not in contact with the electrode component 11, and there is no conduction between the detection part 1221 and the electrode component 11. When the battery pack is collided by an external force, the collision force squeezes the resistor component 12, causing the collision area of ​​the resistor component 12 to be squeezed and deformed, causing the detection part 1221 in the deformation area to be connected with the electrode component 11. When connected, the detection circuit forms a detection signal. According to the detection signal and the mapping relationship between the detection signal and the deformation amount, the deformation amount of the battery pack 1 is determined.

[0071] The above mapping relationship may be a correspondence between the degree of deformation and the amount of deformation. For example, the detection system divides the degree of collision deformation into three levels: slight, moderate and severe. Each collision degree corresponds to a collision deformation amount. The deformation amount of the battery pack can be determined based on this mapping relationship, thereby obtaining the degree of deformation. The deformation amount may be a deformation amount including the number of deformation areas and the deformation size, or a resistance value.

[0072] Specifically, the detection system develops an algorithm based on the deformation amount of the battery pack components that are affected by the collision, such as the bottom guard plate. For example, when slight deformation occurs, 1 to 2 deformation areas are set to be squeezed and turned on; when moderate deformation occurs, 3 to 5 deformation areas are set to be squeezed and turned on; when severe deformation occurs, more than 6 deformation areas are set to be squeezed and turned on.

[0073] In addition, the total resistance value can also be used to determine the degree of collision deformation. The detection system determines the degree of collision damage based on the total resistance value involved in the conduction detected. For example, when the total resistance value detected is less than 10 ohms, it is set as slight deformation. When the total resistance value detected is greater than or equal to 10 ohms and less than or equal to 100 ohms, it is set as moderate deformation. When the total resistance value detected is greater than 100 ohms, it is set as severe deformation.

[0074] When the above-mentioned total resistance value is used to determine the degree of collision deformation, the detection parts 1221 with resistance values ​​recorded on the resistor assembly 12 are distributed. Since the greater the deformation of the battery pack, the greater the deformation of the resistor assembly 12 due to compression, the more detection parts 1221 are involved in conduction. Therefore, the detection system obtains the resistance value of each detection part 1221 involved in conduction in the deformation area. The greater the calculated total resistance value, the detection system obtains the resistance value of each detection part 1221 involved in conduction, accumulates and sums each resistance value, obtains the total resistance value, and compares it with the total resistance value built into the detection system, thereby identifying the "degree of collision" of the battery pack. After determining the deformation of the battery pack, the location of the detection part in the detection part is determined according to the detection signals of multiple detection parts, thereby identifying the "collision area" of the battery pack.

[0075] The resistance of the detection part 1221 on the resistor 122 can be distributed according to a preset rule. For example, along the set detection direction, the resistance value is distributed in a step-by-step manner from small to large. With this arrangement, when performing collision degree detection, the cumulative resistance of adjacent detection parts 1221 in the deformation area is not equal to the resistance of any single point in the entire area, and is not equal to the cumulative resistance of other areas (i.e., non-deformation areas) except the deformation area, so as to avoid detection errors and system misjudgments.

[0076] The detection system in the present application may be, but is not limited to, a single chip microcomputer, an electronic detection system, a signal analysis system, a current detection system, etc.

[0077] The detection system in the present application is connected to the electrode assembly 11, and can detect the resistance value of the detection part 1221 of the detection area in real time, analyze and calculate the detection signal, so as to determine the collision position and collision degree, and output the signal to external monitoring equipment such as the cab in real time.

[0078] The present application identifies the impacted area of ​​the battery based on the resistance value of the detection unit 1221 triggered to be turned on in the deformation area, and obtains the impact degree based on the total resistance value of the triggered conduction, so that the detection is accurate and efficient.

[0079] In addition, the present application can also adjust the collision area and collision degree by changing the number and distribution positions of the detection parts 1221 on the resistor 122 and adjusting the reference data inside the detection system to meet the detection requirements of battery packs of different sizes and types.

[0080] In a specific embodiment, the resistor assembly 12 includes an insulating member 121 and a resistor 122, both of which may be, but are not limited to, plate-shaped structures, and the insulating member 121 and the resistor 122 are arranged opposite to each other. The insulating member 121 is made of an insulating material, and a through hole 1211 is provided on the insulating member 121. A detection portion 1221 is provided on the resistor 122, and the detection portion 1221 is distributed corresponding to the through hole 1211, and the detection portion 1221 is inserted into the through hole 1211 of the insulating member 121. The insulating member 121 insulates the resistor 122 and the detection portion 1221 thereon, thereby preventing the detection portion 1221 that does not meet the collision detection condition from being turned on, so as to ensure the accuracy of the detection.

[0081] In order to increase the detection range, a plurality of through holes 1211 are provided on the insulating member 121. Correspondingly, a plurality of detection parts 1221 are provided on the resistor member 122. The through holes and the detection parts are arranged in an array on their respective structural members. All the detection parts 1221 are provided on the resistor surface of the resistor member 122 facing the side of the insulating member 121 to ensure that the detection parts 1221 are accurately plugged into the through holes 1211.

[0082] When the resistor 122 is deformed by an external force of collision, the detection portion 1221 in the deformation area of ​​the resistor 122 collides and protrudes from its corresponding through hole 1211 and contacts and conducts with the electrode assembly 11. The detection system performs collision damage detection by obtaining the resistance value of the conductive detection portion 1221.

[0083] Exemplarily, the insulating member 121 may be, but is not limited to, an MPP board, MPP (Microcellular Polypropylenefoam), the Chinese name of which is microcellular foamed polypropylene, and the polypropylene microcellular foam material has good elastic plasticity and good insulation performance, and can effectively insulate and provide buffering during collision. In addition, the insulating member 121 may also be made of other insulating materials, and the insulating member 121 is not limited to being in the shape of a plate. As for its material and shape, as long as it meets the insulation performance, it is not limited herein.

[0084] In order to ensure the accuracy of resistance value detection, the setting of the resistance value of the detection unit 1221 can ensure that it is distributed in a certain regular pattern. Specifically, a detection base point is set on the resistor 122, and the resistance value of the detection unit 1221 tends to increase along the first direction and away from the detection base point, with the detection base point as the starting point, wherein the first direction is parallel to the extension direction of the detection unit 1221. Optionally but not limited to, along the first direction and away from the detection base point, the resistance value gradually increases in the form of a predetermined formula or difference. It should be noted that the resistance value in the present application gradually increases in a linear manner, and can be a gradual increase as a whole, but the resistance values ​​of some adjacent resistors 122 may be equal.

[0085] Similar to the distribution of the resistance value in the first direction, the resistance value of the detection part 1221 in the second direction can be set to be along the second direction and away from the detection base point, and the resistance value has an increasing trend, which can be selected but not limited to be along the second direction and away from the detection base point, and the resistance value gradually increases in the form of a predetermined formula or difference, etc. The second direction is parallel to the extension direction of the detection part and is set at an angle to the first direction.

[0086] It should be noted that there may be multiple definitions of the first direction and the second direction in the present application. For example, the first direction may be parallel to the horizontal direction or may have a certain angle with the horizontal direction. Figure 1 Taking the orientation shown as an example, the first direction can be parallel to the X direction, or parallel to the Y direction, or have a certain angle between the X direction and the Y direction. The second direction has a certain angle with the first direction, and it needs to be ensured that the angle between the first direction and the second direction is not zero, that is, the two directions are not the same.

[0087] The following embodiments are all based on the first direction. Figure 1 The X direction in the Figure 1 The Y direction in FIG. 1 is used as an example to illustrate.

[0088] Along the first direction, and / or along the second direction forming an angle with the first direction, the resistance value of the detection part 1221 tends to increase, and it needs to be ensured that, when along the first direction and the second direction, the resistance values ​​of each detection part 1221 within the area enclosed by the first direction and the second direction are not equal.

[0089] The resistance calculation formula is It can be seen that the resistance value of the detection part 1221 is affected by the height L of the detection part 1221, the cross-sectional area S of the detection part 1221 and the resistivity ρ. Therefore, the resistance value can be controlled by controlling the resistivity of the detection part 1221, the cross-sectional area of ​​the detection part 1221 and the height of the detection part 1221.

[0090] In the first specific implementation, the resistance value of the detection part 1221 can be controlled by using materials with different resistivities, for example, the detection parts 1221 on the resistor 122 along the first direction and / or along the second direction are set to have the same height and cross-sectional area, and the resistivities of the detection parts 1221 in the above directions are set to gradually increase. And when along the first direction and the second direction, the resistivities of the detection parts 1221 within the area defined by the first direction and the second direction are not equal. In this way, the resistance value along the above detection direction is ensured to gradually increase.

[0091] In this embodiment, the detection part 1221 with different resistivity can be welded or bonded to the resistor 122, and the detection part 1221 is firmly installed. By using materials with different resistivity to control the resistance value of the detection part 1221, the resistance value error is smaller and more accurate.

[0092] In a second specific implementation, the resistance of the detection part 1221 can be controlled by controlling the cross-sectional area of ​​the detection part 1221. For example, the detection parts 1221 on the resistor 122 along the first direction and / or along the second direction are set to have the same resistivity and height, and the cross-sectional area of ​​the detection part 1221 in the above directions is set to be gradually reduced. And when along the first direction and the second direction, the cross-sectional areas of the detection parts 1221 within the area defined by the first direction and the second direction are not equal. In this way, the resistance value along the above detection direction is ensured to gradually increase.

[0093] In a third specific implementation, the resistance of the detection part 1221 can be controlled by controlling the height of the detection part 1221 on the resistor 122, for example, the detection parts 1221 on the resistor 122 along the first direction and / or along the second direction are set to have the same resistivity and the same cross-sectional area, and the height values ​​of the detection parts 1221 in the above directions are set to gradually increase. And when along the first direction and the second direction, the cross-sectional areas of the detection parts 1221 within the area defined by the first direction and the second direction are not equal. In this way, the resistance value along the above detection direction is ensured to gradually increase.

[0094] In addition, the present application can also control the resistance value of the detection part 1221 by adopting any two or three of different resistivities, different cross-sectional areas, and different heights.

[0095] In a possible implementation, the first direction is a direction starting from the top angle of one side of the resistor 122 and along the first side of the resistor 122, the second direction is perpendicular to the first direction, and the second direction is starting from the above-mentioned board angle of the resistor 122 and along the second side perpendicular to the first side, the detection part 1221 is distributed on the entire board surface of the resistor 122, the resistance value on the resistor 122 increases along the first direction and is distributed in steps, the resistance value increases along the second direction and is distributed in steps, and the resistance values ​​of each detection part 1221 are not equal. This ensures that when detecting the degree of collision, the cumulative resistance value of adjacent resistors is not equal to the resistance value of any single point and the cumulative resistance value of other areas, so as to avoid misjudgment of the detection system.

[0096] Combination Figure 3 , for example, the resistor 122 is a rectangular plate, and the detection base point is set to Figure 1 The first direction is set to the vertex of the lower left corner of the middle resistor 122. Figure 1 The lower left corner of the middle resistor 122 is the vertex along the long side direction of the rectangular plate, and the second direction is Figure 1 With the above vertex as the starting point, along the short side of the rectangular plate, the resistance value gradually increases from left to right, from bottom to top, and from the lower left to the upper right and is distributed in a stepped manner.

[0097] Each detection part 1221 in the present application may be a protrusion, which is distributed on the detection part 1221 and on the resistance surface of the detection part 1221 facing the resistance surface of the insulating member 121, and may be evenly distributed. Regarding the specific shape of the protrusion, it may be an arc-shaped protrusion to prevent the sharp corner structure from scratching the through hole 1211 of the insulating member 121 and the electrode assembly 11. Regarding the specific structure of the protrusion, it may be various, such as arc, square, trapezoidal, etc., which is not limited herein.

[0098] In order to ensure that the protruding part of the structure can pass through the through hole 1211 when the collision deformation occurs, the height of the protrusion should be no less than 60% of the depth of the through hole 1211. When the protrusion height is less than 60% of the depth of the through hole 1211, the size difference between the two is too large, and it is impossible to ensure that the protrusion can effectively pass through the through hole 1211 and conduct when the resistor 122 is slightly deformed or even greatly deformed, thus resulting in detection failure. Therefore, after testing, when the protrusion height is set to be greater than or equal to 60% of the depth of the through hole 1211, it can be ensured that the protrusion and the electrode member can achieve effective contact and conduction during a collision.

[0099] Regarding the arrangement of the detection part 1221, the detection part 1221 is formed by the resistor surface protruding toward one side of the insulating member 121, and can also be welded, bonded or connected by fasteners. The protrusion and the resistor 122 can be integrally formed, which is particularly suitable for the solution of controlling the resistance value of the detection part 1221 by controlling the cross-sectional area of ​​the detection part 1221 and the height of the detection part 1221 in the second and third embodiments. Compared with the first embodiment, the detection part 1221 in the second and third embodiments is easier to process and has a lower processing cost.

[0100] like Figure 2 As shown. In order to ensure the effective conduction of the detection part 1221, the depth of the through hole 1211 of the insulating member 121 can be set to be greater than or equal to the height of the detection part 1221. When the detection part 1221 is not deformed by collision, the detection part 1221 is embedded in the through hole 1211 of the insulating member 121, and the top of the detection part 1221 does not contact the electrode assembly 11. When the external force of the collision squeezes the insulating member 121, the insulating member 121 squeezes the resistor 122 so that the detection part 1221 in the deformed area is exposed from the through hole 1211, and is in contact and conductive with the electrode assembly 11 to achieve collision detection. The detection part 1221 and the through hole 1211 can be clearance fit or interference fit. When both fitting methods are adopted, it is necessary to ensure that the detection part 1221 can be detached from the through hole 1211 and conductive with the electrode assembly 11 when subjected to the external force of the collision.

[0101] Regarding the installation scheme of setting the collision detection device at the bottom of the battery, since a reinforcing plate 40 is provided at the bottom of the battery, and the reinforcing plate 40 is a metal plate and is provided at the center position of the bottom surface of the battery, an insulating connecting plate is provided for the insulating member 121, and a corresponding connection with the reinforcing plate 40 of the battery pack is achieved through the insulating connecting plate.

[0102] Specifically, the insulating member 121 includes an insulating main board 1213, and the above-mentioned through hole 1211 is arranged on the insulating main board 1213 and penetrates the insulating main board 1213. The insulating member 121 also includes an insulating connecting plate 1212, and the insulating connecting plate 1212 is connected to one side of the insulating main board 1213, and the two can be welded, connected by fasteners, or integrally formed. Due to the setting of the reinforcement plate 40, the position of the battery corresponding to the reinforcement plate 40 is a non-collision detection area, and other areas on the battery except the installation area of ​​the reinforcement plate 40 are designated as collision detection areas. When installing the insulating member 121, the insulating connecting plate 1212 is distributed corresponding to the reinforcement plate 40, so that the insulating main board 1213 avoids the reinforcement plate 40 to achieve insulation of the detection part 1221 of the collision detection area.

[0103] A first connector is disposed on the insulating connection plate 1212 , and the insulating connection plate 1212 can be fastened to the reinforcing plate 40 through the first connector.

[0104] In order to ensure that all detection parts 1221 are insulated, it can be set that the orthographic projection of the resistor 122 on the surface where the insulating connecting plate 1212 is located is offset from the insulating connecting plate 1212. At the same time, the orthographic projection of the resistor 122 on the surface where the insulating main board 1213 is located is covered by the insulating main board 1213, thereby ensuring the accuracy of the detection structure.

[0105] The insulating connecting plate 1212 may be a groove structure corresponding to the position of the reinforcing plate 40. The insulating connecting plate 1212 is provided with a connecting hole, and the fastener fixes the insulating member 121 to the bottom of the battery through the connecting hole. Each through hole 1211 is provided on the plate surface of the insulating member 121 except the insulating connecting plate 1212. Since the reinforcing plate 40 is usually arranged in the middle of the battery, the insulating connecting plate 1212 is correspondingly arranged in the middle of the insulating member 121.

[0106] There can be one or more insulating main boards 1213, and the insulating main boards 1213 are arranged one by one with the reinforcing plates 40. When multiple insulating main boards 1213 are provided, they are arranged in an array, and two adjacent insulating main boards 1213 are connected by insulating connecting plates 1212. Correspondingly, in addition, the resistor 122 can also adopt a split structure, such as Figure 3 and Figure 4 As shown, the resistors 122 are arranged in two or more configurations, and the multiple resistors 122 are arranged in an array at intervals, and one resistor 122 corresponds to one insulating main board 1213, so that the detection parts 1221 on each resistor 122 are effectively insulated. Each resistor 122 is respectively arranged in a region corresponding to the non-connecting part on the insulating member 121, and such a configuration can reduce the deformation caused by locking. The specific number of resistors 122 can also be multiple.

[0107] Correspondingly, a resistor connecting portion is provided on the resistor 122, and the resistor connecting portion corresponds to the reinforcing plate 40. The board surface of the resistor 122 except the resistor connecting portion is a detection surface, and each detection portion 1221 is provided on the detection surface and is adapted to each through hole 1211. A connection hole is provided on the resistor connecting portion, and the fastener passes through the electrode assembly 11, the resistor connecting hole, and the insulating member connecting hole in sequence and is locked inside the battery pack. The integrated resistor 122 structure is easy to install and easy to process.

[0108] refer to Figure 1. In order to be installed corresponding to the reinforcing plate 40, regarding the structure of the electrode member 111 in the present application, in a specific embodiment, the electrode member 111 includes an electrode portion 1111 and an electrode connecting portion 1112, and the electrode connecting portion 1112 is connected to one side of the electrode portion 1111, corresponding to the reinforcing plate 40, and the positive projection of the detection portion 1221 on the surface where the electrode member 111 is located is covered by the electrode portion to ensure that when subjected to external force, each detection portion 1221 can be in contact and conduction with the electrode member.

[0109] Furthermore, the reinforcing plate 40 for connecting the electrode connecting portion 1112 and the battery pack 1 may be fastened by a second connecting member to ensure the installation strength of the collision detection device.

[0110] In a specific embodiment, the electrode member is specifically a positive electrode member and a negative electrode member, the positive electrode portion of the positive electrode member is connected to the positive terminal of the detection system through a wire, and the negative electrode portion of the negative electrode member is connected to the negative terminal of the detection system through a wire. When the external collision force causes the detection part 1221 to be connected to the positive electrode portion or the negative electrode portion, the detection part 1221, the positive electrode portion, the negative electrode portion and the external detection system form a detection path, so that the detection system performs collision detection.

[0111] In this embodiment, corresponding to the positive pole and negative pole of the detection system, the positive pole and negative pole in this embodiment can be set as a parallel distribution structure, and both the positive pole and negative pole can adopt electrode plates, which are specifically conductive plates, and can be aluminum foil plates. The positive pole can be set at the upper part and connected to the positive pole of the detection system, and the negative pole is set at the lower part of the positive pole and connected to the negative pole of the detection system. An insulating member 121 and a resistor 122 are set between the positive pole and the negative pole, and the resistor 122 is embedded in the insulating member 121 through the detection part 1221, and the positive and negative poles are insulated at the same time. In addition, the positive pole and the negative pole are not limited to sheet or plate shapes, and their structures can be various, as long as the electrical connection function is realized.

[0112] Taking the positive and negative electrode components as sheets as an example, the thickness of the positive and negative electrode components can be 50μm to 1000μm, for example, the thickness value can be 100μm, 400μm, 600μm, 800μm. Generally speaking, the thickness of the electrode assembly 11 should be moderate, neither too thick nor too thin. When the thickness of the positive and negative electrode components is less than 50μm, the thickness of the electrode assembly 11 is too thin, the resistance is too small, the current carrying capacity is weak, and it cannot carry a large current, which is very likely to cause temperature rise and current breakdown, thereby affecting the performance or failure. When the thickness of the positive and negative electrode components is greater than 1000μm, the thickness of the electrode assembly 11 is too thick, the resistance is too large, resulting in obstruction of current transmission and reducing the conductivity of the electrode assembly 11. Therefore, after testing, the thickness range of the electrode assembly 11 is set between 50μm and 1000μm.

[0113] In summary, the collision detection device provided in the embodiment of the present application can be arranged in the detection area of ​​the battery pack 1. The collision detection device 10 is provided with an electrode assembly 11 and a resistor assembly 12. The electrode assembly 11 is connected to the detection system. The resistor assembly 12 is arranged in the detection area of ​​the electrode assembly 11. The resistor assembly 12 is provided with a plurality of detection parts 1221. When the collision detection condition is not met, the detection part 1221 is not connected to the electrode assembly 11. When the collision detection condition is met, the detection part 1221 in the area where the resistor assembly 12 is deformed is connected to the electrode assembly 11, thereby forming a detection signal in the detection circuit. The detection system determines the deformation amount and deformation area of ​​the battery pack according to the detection signal and the mapping relationship between the detection signal and the deformation amount and deformation area inside the detection system, thereby determining the collision damage area and the degree of collision damage of the battery pack. In addition, the present application can adjust the collision damage conditions by changing the position and number of the detection parts 1221 of the resistor assembly 12 and adjusting the detection strategy corresponding to the detection system, so as to meet various collision detection requirements.

[0114] In addition, the present application also provides a battery pack, which mainly includes a battery 20 and the above-mentioned collision detection device 10. The collision detection device 10 is bonded or welded by a rubber strip 50, or fixed to the detection area of ​​the battery 20 by fasteners. The collision detection device 10 is electrically connected to an external detection system, and the detection system is connected to the collision detection device 10 to judge the collision position and degree in real time, and output a signal to an external monitoring system, such as a cab, in real time.

[0115] The battery pack 1 in the present application has a built-in collision detection device 10, which can achieve accurate and efficient detection of the battery pack detection area.

[0116] like Figure 5 In a specific embodiment, the bottom guard plate 30 is installed at the bottom of the battery 20, and an installation space is formed between the bottom guard plate 30 and the battery 20. The collision detection device 20 is arranged in the installation space, fixedly connected to the bottom of the battery 20 and the bottom guard plate 30, and fixed by the bottom guard plate 30.

[0117] When the bottom guard plate 30 is hit, it deforms and squeezes the insulating member 121 of the resistor assembly 12. At this time, the resistor 122 in the collision area is connected to the electrode assembly 11. The detection system detects the resistance value of the collision area and then identifies the "collided area". Since the resistor 122 is distributed with detection parts 1221 with different resistance values, the greater the deformation of the bottom guard plate, the greater the resistor 122 is squeezed, the more detection parts 1221 are connected, and the greater the total resistance value detected by the detection system. The "degree of collision" is identified based on the measured total resistance value. Since the bottom area of ​​the battery 20 is more likely to be hit, arranging the collision detection device 10 at this position can realize real-time detection of collision damage to the entire bottom of the battery 20.

[0118] The embodiment of the present application further provides an electric device, comprising the battery pack 1 described in any of the above embodiments, the battery pack 1 is used to provide electric energy to the electric device. The electric device has stable and reliable performance and high safety.

[0119] The electrical equipment in the embodiments of the present application may be a vehicle, for example, the vehicle may be a fuel vehicle, a gas vehicle or an electric vehicle, and the electric vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. Accordingly, the electrical device may be a driving mechanism of the vehicle or a control system of the vehicle.

[0120] In addition, the electrical equipment may also be other energy storage devices, such as mobile phones, portable devices, laptop computers, electric toys, electric tools, ships and spacecraft, etc., among which the spacecraft may include airplanes, rockets, space shuttles or spacecraft.

[0121] In view of the fact that the electrical equipment in the present application includes the battery pack described in any of the above embodiments, the electrical equipment has a battery pack structure and beneficial effects, which will not be elaborated herein.

[0122] like Figure 6 In addition, the present application also provides a battery pack collision detection method, which is applied to the above-mentioned collision detection device and includes the steps of:

[0123] S1, obtaining a detection signal of a detection circuit;

[0124] S2. Determine the deformation amount of the battery pack according to the detection signal and the mapping relationship between the detection signal and the deformation amount.

[0125] In the above steps S1 and S2, the detection system can be used to detect the number and size of the deformation area, and the degree of collision damage, such as slight, moderate and severe, can be determined based on the mapping relationship between the number and size of deformation and the deformation amount. The above mapping relationship between the detection signal and the deformation amount is pre-acquired and stored in the detection system.

[0126] In addition, the degree of damage and the damaged area can also be determined based on the resistance values ​​of each detection part 1221. Due to the impact force, the resistor component 12 is deformed, and the detection part 1221 in the deformation area is connected to the electrode component 11 and forms a detection loop with the detection system. The resistance value of the detection part 1221 involved in the conduction is recorded by the built-in program of the detection system. In this step, the collision area can be delineated based on the resistance value and with reference to the preset resistance value distribution position control program in the detection system, and the collision area of ​​the battery pack 1 can be identified by the obtained resistance values.

[0127] After the total resistance value is obtained to determine the degree of collision damage of the battery pack 1, a warning detection is further set. Specifically, after the deformation of the battery pack is determined, it also includes step S3: comparing the deformation with the preset deformation, and step S4: when the deformation is greater than the preset deformation, generating an alarm message, so as to realize an alarm when the collision damage exceeds the warning damage degree.

[0128] In the present application, when the detected collision damage area is located in the warning damage area, and / or when the detected collision damage degree reaches or exceeds the warning damage degree, the detection system can sound an alarm. The alarm is sent to the control center such as the cab to facilitate the detection and replacement of the severely deformed battery pack 1.

[0129] In addition, the degree of collision damage can also be determined based on the resistance values ​​involved in conduction. Specifically, the total resistance is calculated based on the resistance values. The detection system refers to the mapping relationship with the total resistance in the built-in program and determines the degree of collision damage of the battery pack 1 based on the calculated total resistance.

[0130] In this step, the greater the deformation of the bottom guard plate, the greater the compression of the resistor 122, the more detection parts 1221 are turned on, and the greater the total resistance value detected by the detection system, so the degree of collision can be identified according to the total resistance value. For example, when the battery pack 1 is hit by an external force, the collision force acts on the bottom guard plate, and the bottom guard plate deforms and squeezes the resistor component 12, so that the detection part 1221 in the deformation area is turned on with the electrode assembly 11.

[0131] The above detection signal may include detection signals of multiple detection units. After determining the actual deformation amount of the battery pack, the method further includes step S5: determining the position of the detection unit on the resistor according to the detection signals of the multiple detection units.

[0132] In step S5, the position of the detection unit is determined according to the detection signals of the plurality of detection units and based on the position mapping relationship or the mapping relationship between the resistance value and the position.

[0133] The battery pack collision detection method in the present application can efficiently and cost-effectively identify the collision area of ​​the entire battery pack 1 and perform real-time detection of the collision degree, thereby achieving efficient and real-time detection of bottom collision damage.

[0134] 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.

Claims

1. A collision detection device, characterized in that: For a battery pack (1), the collision detection device comprises: An electrode assembly (11) comprising at least two electrode members (111) arranged opposite to each other, wherein the at least two electrode members (111) are used to form a detection circuit; A resistor component (12), the resistor component (12) having a detection portion (1221), and in the resistor component (12), at least the detection portion (1221) is arranged between at least two of the electrode members (111); The collision detection device (10) is configured such that when an external force is applied, the detection portion (1221) contacts and conducts with at least one of the electrode members (111) to form a detection signal in the detection circuit.

2. The collision detection device according to claim 1, characterized in that: The resistor assembly (12) comprises a resistor element (122) and an insulating element (121); The resistor (122) and the insulating member (121) are arranged opposite to each other, a through hole (1211) is provided on the insulating member (121), the detection unit (1221) is arranged on the resistor (122), and the through hole (1211) is used for the detection unit (1221) to pass through.

3. The collision detection device according to claim 2, characterized in that: There are a plurality of through holes (1211), and a plurality of detection parts (1221). The through holes (1211) and the detection parts (1221) are arranged in an array and are disposed in a one-to-one correspondence.

4. The collision detection device according to claim 3, characterized in that: The resistor (122) has a detection base point, and along a first direction and away from the detection base point, the resistance value of the detection portion (1221) has an increasing trend, and the first direction is parallel to the extension direction of the resistor (122).

5. The collision detection device according to claim 4, characterized in that: Along the first direction and away from the detection base point, the resistance value gradually increases.

6. The collision detection device according to claim 5, characterized in that: Along a second direction and away from the detection base point, the resistance value has an increasing trend, and the second direction is parallel to the extension direction of the resistor (122) and is arranged at an angle with the first direction.

7. The collision detection device according to claim 6, characterized in that: The resistor (122) is a rectangular plate, the detection base point is located at a vertex corner of one side of the rectangular plate, the first direction is the long side direction of the rectangular plate, and the second direction is the short side direction of the rectangular plate.

8. The collision detection device according to any one of claims 2 to 7, characterized in that: There are a plurality of detection parts (1221), and the plurality of detection parts (1221) are arranged in an array; The detection portion (1221) is a protrusion arranged on the resistor (122).

9. The collision detection device according to claim 8, characterized in that: The height of the protrusion is not less than 60% of the depth of the through hole (1211).

10. The collision detection device according to claim 8, characterized in that: The insulating member (121) comprises an insulating main board (1213), and the through hole (1211) is arranged on the insulating main board (1213); the orthographic projection of the resistor (122) on the surface where the insulating main board (1213) is located is covered by the insulating main board (1213); The insulating member (121) comprises an insulating connecting plate (1212), and the insulating connecting plate (1212) is connected to one side of the insulating main plate (1213); the orthographic projection of the resistor (122) on the surface where the insulating connecting plate (1212) is located is arranged offset from the insulating connecting plate (1212); The insulating connecting plate (1212) is used to correspond to the reinforcing plate (40) of the battery pack (1).

11. The collision detection device according to claim 10, characterized in that: The insulating connection plate (1212) is provided with a first connection member, and the first connection member is used to connect the insulating connection plate (1212) and the reinforcing plate (40).

12. The collision detection device according to claim 11, characterized in that: There are a plurality of insulating main boards (1213), which are arranged in an array, and two adjacent insulating main boards (1213) are connected via the insulating connecting plate (1212); there are a plurality of electrode members (111), which are arranged in an array at intervals; One electrode member (111) corresponds to one insulating main board (1213).

13. The collision detection device according to claim 8, characterized in that: The electrode member (111) comprises an electrode portion (1111) and an electrode connecting portion (1112), wherein the electrode connecting portion (1112) is connected to one side of the electrode portion (1111), and an orthographic projection of the detection portion (1221) on the surface where the electrode member (111) is located is covered by the electrode portion (1111); The collision detection device (10) is configured such that when an external force is applied, the detection portion (1221) and the electrode portion (1111) are in contact and conduction with each other.

14. The collision detection device according to claim 13, characterized in that: A second connecting member is provided on the electrode connecting portion (1112), and the second connecting member is used to connect the electrode connecting portion (1112) and the reinforcing plate (40) of the battery pack (1).

15. The collision detection device according to claim 13, characterized in that: There are a plurality of electrode parts (1111), and the plurality of electrode parts (1111) are arranged in an array, and adjacent electrode parts (1111) are connected via the electrode connecting parts (1112).

16. The collision detection device according to claim 14, characterized in that: The electrode member (111) is an aluminum foil electrode member.

17. The collision detection device according to claim 13, characterized in that: The electrode element (111) has a thickness of 50 μm to 1000 μm.

18. A battery pack, comprising a battery (20), a bottom guard plate (30) and a collision detection device according to any one of claims 1 to 17, wherein the collision detection device is arranged between the battery (20) and the bottom guard plate (30).

19. The battery pack according to claim 18, characterized in that: The reinforcing member of the battery (20) is connected to the first connecting member of the insulating connecting plate (1212) and / or the second connecting member of the electrode connecting portion.

20. An electrical equipment, characterized in that: Comprising a battery pack as claimed in claim 18 or 19 above.

21. A battery pack collision detection method, used in the collision detection device according to any one of claims 1 to 17, characterized in that: Includes steps: Acquire a detection signal of a detection circuit; The deformation amount of the battery pack is determined according to the detection signal and the mapping relationship between the detection signal and the deformation amount.

22. The battery pack collision detection method according to claim 21, characterized in that: After determining the deformation of the battery pack, it also includes: Compare the deformation amount with the preset deformation amount; When the deformation is greater than the preset deformation, an alarm message is generated.

23. The battery pack collision detection method according to claim 21, characterized in that: The detection signal includes detection signals of multiple detection units; After determining the deformation of the battery pack, it also includes: The positions of the detection parts on the resistor are determined according to the detection signals of the multiple detection parts.

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