Detection device for expansion force of battery pack

Abstract

The utility model belongs to the technical field of battery pack detection, and provides a battery pack expansive force detection device comprising a displacement detection mechanism which is installed on a crossbeam in a box body, the displacement detection mechanism is provided with a telescopic probe and a wire harness, and the telescopic probe movably penetrates through the crossbeam and is tightly attached to a battery cell; the wire harness is used for connecting an external battery BMS; and the telescopic probe can move and contract along the normal direction of the cross beam when the battery cell expands, so that the wire harness transmits the displacement of the telescopic probe into the battery BMS. Compared with the prior art, the battery pack displacement sensor has the advantages that the displacement sensor body is arranged on the cross beam of the battery pack, and the telescopic probe on the sensor is in close contact with the battery cell, so that when the battery cell expands, the displacement sensor can accurately measure the displacement change of the telescopic probe, and the expansion degree of the battery can be monitored in real time; the safety performance of the battery pack is improved, and the normal use of the battery pack is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery pack detection, and particularly relates to a device for detecting expansion force of a battery pack. Background Art

[0002] With the development of battery technology, it is becoming increasingly important to monitor the internal environment of battery packs during use.

[0003] Existing battery packs typically only monitor internal temperature to prevent overheating or extreme temperature fluctuations, ensuring they operate within the ideal temperature range. However, batteries expand during charging and discharging. While moderate expansion is normal, excessive expansion may indicate an internal battery problem and pose a safety hazard. In extreme cases, excessive expansion can cause the battery to rupture or even catch fire. Therefore, monitoring the extent of battery expansion is also crucial for ensuring battery pack safety.

[0004] As for current technology, most of them are achieved by installing pressure sensors on the outer wall of the battery pack. When the battery pack expands, the pressure detected by the pressure sensor will increase significantly. However, this method cannot achieve real-time detection of the expansion amplitude of the battery, which leads to serious deficiencies in the safety of the battery pack and affects the normal use of the battery pack. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a device for detecting the expansion force of a battery pack.

[0006] The technical solution adopted by the present invention to solve the technical problem is to propose a device for detecting the expansion force of a battery pack, which can detect the expansion amplitude of multiple battery cells in the box. The detection device includes:

[0007] A displacement detection mechanism is mounted on the crossbeam inside the box. The displacement detection mechanism is provided with a telescopic probe and a wiring harness. The telescopic probe movably passes through the crossbeam and is closely attached to the battery cell. The wiring harness is used to connect to an external battery management system (BMS).

[0008] The telescopic probe can move and contract along the normal direction of the beam when the battery cell expands, so that the wiring harness can transmit the displacement of the telescopic probe to the battery BMS.

[0009] In the above-mentioned device for detecting the expansion force of a battery pack, a limit block is provided on the telescopic probe, a displacement sensor body is provided on the displacement detection mechanism, and an elastic member is sleeved on the telescopic probe, one end of the elastic member is pressed against the limit block, and the other end is pressed against the side wall of the displacement sensor body.

[0010] In the above-mentioned device for detecting the expansion force of a battery pack, a snap-fitting groove is further formed on the displacement sensor body, and the wiring harness is connected to the displacement sensor body and snap-fitted into the snap-fitting groove.

[0011] In the above-mentioned device for detecting the expansion force of a battery pack, a contact head connected to one side of the limit block is formed at the end of the telescopic probe, and the contact head is movably attached to the battery cell.

[0012] In the above-mentioned device for detecting the expansion force of a battery pack, the contact head can be a round head or a roller head.

[0013] In the above-mentioned device for detecting the expansion force of a battery pack, the top wall and bottom of the displacement sensor body are further provided with extension plates, and a first connection hole is provided on the extension plate. A bracket is provided on the side wall of the crossbeam, and a second connection hole is provided on the bracket. When the displacement sensor body is tightly attached to the bracket, the first connection hole can be aligned with the second connection hole to allow a fixing member to pass through and fix the displacement sensor body to the bracket.

[0014] In the above-mentioned device for detecting the expansion force of a battery pack, a protective shell is further provided on the displacement sensor body, and the protective shell covers the wiring harness to prevent the wiring harness from falling off or being damaged.

[0015] In the above-mentioned device for detecting the expansion force of a battery pack, a guide hole located on one side of the bracket is further provided on the crossbeam, and the telescopic probe can be movably inserted into the guide hole and abut against the battery cell when the displacement sensor body is installed on the bracket.

[0016] The technical solution adopted by the present invention to solve the technical problem is to provide a device for detecting the expansion force of a battery pack, which can detect the expansion amplitude of several battery cells in the box. The device is characterized in that it includes:

[0017] a pressure sensor, mounted on a crossbeam inside the box, wherein the pressure sensor is provided with a wiring harness for connecting to an external battery management system (BMS);

[0018] A mounting plate and a force-bearing plate, wherein the mounting plate is connected to one side of the pressure sensor and is movably clamped on the crossbeam; the force-bearing plate is connected to the mounting plate;

[0019] When the mounting plate is connected to the crossbeam, the side wall of the force-bearing plate is movably pressed against the battery cell, so that the pressure sensor can read the squeezing force applied to the force-bearing plate when the battery cell expands.

[0020] In the above-mentioned device for detecting the expansion force of a battery pack, the pressure sensor, the force-bearing plate and the mounting plate are jointly formed with a locking groove, and the locking groove is movably engaged with the crossbeam.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention is a device for detecting the expansion force of a battery pack. A displacement sensor body is arranged on the crossbeam of the battery pack, and the telescopic probe on the sensor is in close contact with the battery cell. When the battery cell expands, the displacement sensor can accurately measure the displacement change of the telescopic probe, thereby realizing real-time monitoring of the battery expansion degree, improving the safety performance of the battery pack, and ensuring the normal use of the battery pack.

[0023] (2) The use of elastic parts can effectively ensure that the telescopic probe automatically returns to its initial position after the contraction detection, so as to ensure the subsequent accurate detection of other battery cells. At the same time, the contact head at the end of the telescopic probe is preferably a round head and a roller head, which effectively reduces the contact area between the contact head and the battery cell, thereby improving the sensitivity of the device in detecting changes in the expansion force of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the beam in the box;

[0025] Figure 2 It is a structural diagram of the displacement detection mechanism;

[0026] Figure 3 It is a three-dimensional picture of the bracket on the front plate;

[0027] Figure 4 It is a structural diagram of the pressure sensor and the force plate;

[0028] Figure 5 This is a three-dimensional diagram of the guide holes on the front plate.

[0029] In the figure, 1, box body; 10, beam; 100, bracket; 100a, second connecting hole; 101, guide hole;

[0030] 2. Displacement detection mechanism; 20. Telescopic probe; 200. Limit block; 201. Contact head; 21. Wiring harness; 22. Displacement sensor body; 220. Engaging groove; 23. Elastic member; 24. Extension plate; 240. First connecting hole; 25. Protective shell;

[0031] 3. Pressure sensor; 30. Force plate; 31. Mounting plate; 32. Locking groove. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments. Example

[0033] like Figures 1 to 5 As shown, the utility model is a device for detecting the expansion force of a battery pack, which realizes the detection of the expansion amplitude of several battery cells in a box body 1, wherein the detection device includes: a displacement detection mechanism 2, which is installed on the beam 10 in the box body 1, and a telescopic probe 20 and a wiring harness 21 are provided on the displacement detection mechanism 2, the telescopic probe 20 is movable through the beam 10 and is close to the battery cell; the wiring harness 21 is used to connect to an external battery BMS; the telescopic probe 20 can move and contract along the normal direction of the beam 10 due to the expansion of the battery cell, so that the wiring harness 21 can transmit the displacement of the telescopic probe 20 to the battery BMS.

[0034] This solution mainly realizes the detection of battery expansion amplitude, specifically, Figures 1 to 3 As shown, in a normal state, the end of the telescopic probe 20 on the displacement detection mechanism 2 can be tightly attached to the battery cell (the battery cell does not expand at this time), and when the battery cell expands, the expansion force of the battery cell will push the telescopic probe 20 along the battery cell. Figure 2 By contracting to the left, the displacement detection mechanism 2 can transmit the displacement of the telescopic probe 20 to the external battery BMS (not shown in the figure) through the wiring harness 21, so as to judge whether the expansion amplitude exceeds the safe range, thereby realizing real-time monitoring of the battery expansion degree, improving the safety performance of the battery pack, and ensuring the normal use of the battery pack.

[0035] A limit block 200 is provided on the telescopic probe 20, a displacement sensor body 22 is provided on the displacement detection mechanism 2, and an elastic member 23 is sleeved on the telescopic probe 20, one end of the elastic member 23 is tightly pressed against the limit block 200, and the other end is tightly pressed against the side wall of the displacement sensor body 22.

[0036] like Figure 2 As shown, this solution mainly uses a displacement sensor body 22 to detect the displacement of the telescopic probe 20. Specifically, when the telescopic probe 20 contracts due to battery expansion, the movement distance of the telescopic probe 20 can be accurately read by the displacement sensor body, and then the read information is transmitted to the battery BMS through the wiring harness 21. It should be noted that when the detection device detects different expansion forces existing in the battery cell itself, the telescopic probe 20 is subjected to different squeezing forces. Therefore, under the elastic deformation ability of the elastic member 23, the limit block 200 is pushed to extend the telescopic probe 20 again and reset it to the initial state, which provides a guarantee for the accuracy of subsequent battery cell expansion force detection. It should be noted that the elastic member 23 in this solution can be replaced by other elastic devices such as compression springs and reset springs.

[0037] Furthermore, in this embodiment, if Figure 2 The right end of the telescopic probe 20 is further formed with a contact head 201 connected to one side of the stop block 200. This contact head 201 can be kept in close contact with the battery cell during the detection process. Preferably, the contact head 201 in this embodiment can adopt a round head or a roller head, which effectively reduces the contact area between the contact head 201 and the battery cell, thereby improving the sensitivity of the device in detecting changes in the expansion force of the battery cell.

[0038] Preferably, if Figure 2 As shown, the present solution further forms a snap-fit ​​groove 220 on the displacement sensor body 22. Since the wiring harness 21 is a key factor in transmitting the battery cell expansion amplitude information, the wiring harness 21 connected to the displacement sensor body 22 is snapped into the snap-fit ​​groove 220, effectively avoiding the wiring harness 21 from being entangled or damaged.

[0039] Furthermore, in this embodiment, a protective shell 25 is provided on the displacement sensor body 22. The protective shell 25 covers the wiring harness 21 (note that the wiring harness 21 is led out from one side of the displacement sensor body 22), thereby providing a certain degree of protection for the wiring harness 21 and preventing the wiring harness 21 from being detached from the engaging slot 220 and being scratched or damaged.

[0040] The top and bottom walls of the displacement sensor body 22 are further provided with extension plates 24, which are provided with a first connecting hole 240. A bracket 100 is provided on the side wall of the beam 10, which is provided with a second connecting hole 100a. When the displacement sensor body 22 is tightly attached to the bracket 100, the first connecting hole 240 can be aligned with the second connecting hole 100a to allow a fixing member to pass through and fix the displacement sensor body 22 to the bracket 100.

[0041] like Figure 2 and Figure 3 As shown, for the installation of the displacement sensor body 22, an extension plate 24 is formed by extending outward from the top and bottom walls. It is worth noting that the bracket 100 on the beam 10 is generally L-shaped to ensure that the length direction of the displacement sensor body 22 and the telescopic probe 20 installed on the bracket 100 is parallel to the normal direction of the beam 10. When the fixing member passes through the first connection hole 240 and the second connection hole 100a that are aligned with each other, the displacement sensor body 22 can be firmly fixed on the bracket 100, which ensures the accuracy of the telescopic probe 20 in detecting the battery expansion amplitude, and also provides convenience for subsequent disassembly during maintenance or replacement of the device. It should be noted that the fixing member in this solution can be replaced by other connecting devices such as bolts and screws.

[0042] Preferably, this embodiment further provides a guide hole 101 on one side of the bracket 100 on the crossbeam 10. When the displacement sensor body 22 is mounted on the bracket 100, the telescopic probe 20 can be movably inserted into the guide hole 101 and abut against the battery cell. The guide hole 101 serves to guide and limit the telescopic probe 20 when it contracts and moves, thereby preventing the telescopic probe 20 from tilting and affecting the smoothness and accuracy of the displacement sensor in detecting the degree of battery expansion. Example

[0043] like Figures 4 and 5 As shown, based on the first embodiment, the displacement sensor body 22 is replaced with a pressure sensor 3. At the same time, as shown in FIG. Figure 4 As shown, a mounting plate 31 and a force-bearing plate 30 are successively connected to one side of the pressure sensor 3. During the installation process, the locking groove 32 formed by the pressure sensor 3, the force-bearing plate 30 and the mounting plate 31 is movably engaged with the guide hole 101. Figure 4 All the components in the device play a certain limiting function, so that the pressure sensor 3 can be accurately and stably fixed on the side wall of the beam 10. In addition, this embodiment puts the force plate 30 close to the battery cell. When the battery cell expands, it will give the force plate 30 an expansion force. The pressure sensor 3 can accurately read the pressure on the force plate 30 and transmit the information to the battery BMS through the wiring harness 21, so that workers can judge whether the expansion force exceeds the safety range. This method can also detect the battery expansion force and improve the safety of the battery. It should be noted that this refers to Figure 5 The crossbeam 10 in the embodiment can adopt the above-mentioned guide hole 101 structure without the bracket 100 structure, thus saving the use of parts and reducing the manufacturing cost.

[0044] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] In addition, terms such as "first," "second," and "an" in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0046] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0047] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

Claims

1. A device for detecting the expansion force of a battery pack, which can detect the expansion amplitude of several battery cells in a box, characterized in that: The detection device includes: A displacement detection mechanism is mounted on the crossbeam inside the box. The displacement detection mechanism is provided with a telescopic probe and a wiring harness. The telescopic probe movably passes through the crossbeam and is closely attached to the battery cell. The wiring harness is used to connect to an external battery management system (BMS). The telescopic probe can move and contract along the normal direction of the beam when the battery cell expands, so that the wiring harness can transmit the displacement of the telescopic probe to the battery BMS.

2. The device for detecting expansion force of a battery pack according to claim 1, characterized in that: A limit block is provided on the telescopic probe, a displacement sensor body is provided on the displacement detection mechanism, and an elastic member is sleeved on the telescopic probe, one end of the elastic member is pressed against the limit block, and the other end is pressed against the side wall of the displacement sensor body.

3. The device for detecting expansion force of a battery pack according to claim 2, characterized in that: The displacement sensor body is further formed with a clamping groove, and the wiring harness is connected to the displacement sensor body and clamped in the clamping groove.

4. The device for detecting expansion force of a battery pack according to claim 2, wherein: The end of the telescopic probe is further formed with a contact head connected to one side of the limit block, and the contact head is movably attached to the battery core.

5. The device for detecting expansion force of a battery pack according to claim 4, characterized in that: The contact head is a circular head.

6. The device for detecting expansion force of a battery pack according to claim 2, characterized in that: The top wall and bottom of the displacement sensor body are further provided with an extension plate, and a first connecting hole is provided on the extension plate. A bracket is provided on the side wall of the beam, and a second connecting hole is provided on the bracket. When the displacement sensor body is tightly attached to the bracket, the first connecting hole can be aligned with the second connecting hole to allow a fixing member to pass through and fix the displacement sensor body to the bracket.

7. The device for detecting expansion force of a battery pack according to claim 2, characterized in that: The displacement sensor body is further provided with a protective shell, which covers the wiring harness to prevent the wiring harness from falling off or being damaged.

8. The device for detecting expansion force of a battery pack according to claim 6, characterized in that: The crossbeam is further provided with a guide hole located on one side of the bracket. When the displacement sensor body is mounted on the bracket, the telescopic probe can be movably inserted into the guide hole and abut against the battery core.

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