Fixing structure for temperature sensing device in power battery

Abstract

The utility model discloses a fixing structure for a temperature sensing device in a power battery, an insulating reinforcing plate comprises a plate body which is sleeved on the periphery of a temperature sensor and is matched with the temperature sensor in shape and extension tables which respectively protrude and extend outwards from two opposite side wall surfaces of the plate body, and a clamping piece which protrudes and extends upwards is formed on any extension table. One side edge of the busbar is provided with an avoiding groove or an avoiding opening, two opposite inner side walls of the avoiding groove or the avoiding opening are respectively provided with a clamping groove extending towards the outer side of the avoiding groove or the avoiding opening in a sunken mode, and the clamping grooves are respectively matched with the clamping pieces in a one-to-one corresponding clamping mode. The clamping piece on the insulation reinforcing plate is clamped with the clamping groove, physical clamping is achieved, the structure is more reliable, the position of the temperature sensing device can be finely adjusted, and the problem of size limitation in the assembling process is solved; the structure of the insulation reinforcing plate is simple to process, and dimensional tolerance is easy to meet. The reinforcing plate is in contact with the busbar through the convex points on the bottom surface, so that the temperature of the busbar is prevented from being conducted to the reinforcing plate to interfere with the accuracy of collecting the temperature of the battery cell by the temperature sensor.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and specifically to a fixing structure for a temperature sensing device in a power battery. Background Technology

[0002] With the rapid development of the electric vehicle industry, the electrification trend of powertrains is becoming increasingly apparent. As the core power source of an electric vehicle, the battery is a crucial component, and its temperature characteristics directly affect the vehicle's performance, lifespan, and durability. Currently, given the limitations of power battery capacity, the level of power battery pack technology, especially the power battery thermal management system, is vital for improving battery consistency and ensuring overall vehicle safety. During the operation of an electric vehicle, the charging and discharging of the power battery generates a significant amount of heat. If heat is not dissipated in time, the internal temperature of the power battery pack will rise sharply, leading to a widening temperature difference. This exacerbates the inconsistency in internal resistance and capacity of the power battery, and may even cause thermal runaway, posing a significant safety hazard. Therefore, it is necessary to monitor the temperature of the power battery by fixing temperature sensors at appropriate locations.

[0003] A conventional method for fixing a temperature sensor in a power battery involves welding the sensor directly into an insulating protective plate with a clearance groove. A recessed slot is then formed on the outer surface of the insulating protective plate, and a U-shaped latch is formed on the side of the busbar. The slot on the insulating reinforcing plate engages with the inner wall of the latch on the busbar to secure the temperature sensor to the busbar. The temperature sensor then collects the temperature of the top cover of the power battery cell. However, the applicant has found the following drawbacks with this method: Firstly, assembling the insulating reinforcing plate and the busbar requires removing the busbar for assembly. After assembly, the busbar is placed on a pressing fixture, which can easily damage the circuit board. Secondly, the bottom surface of the reinforcing plate is in close contact with the busbar, allowing the busbar's temperature to be conducted to the temperature sensor through the bottom surface of the reinforcing plate, affecting the accuracy of temperature measurement. Furthermore, the need for a slot on the outer wall of the insulating reinforcing plate significantly reduces its structural strength. Existing methods for fixing temperature sensors include welding the sensor to a protective groove at one end of a signal acquisition nickel plate, with the other end welded to the busbar. Heat is conducted through the nickel plate, allowing the sensor to collect the busbar temperature. The applicant has found that this method results in inaccurate temperature readings because the sensor detects the busbar temperature, which differs from the actual cell temperature. Another method involves welding the sensor to a protective groove within an insulating reinforcement plate, then fixing the plate to an insulating support using adhesive or thermal riveting. This method allows the sensor to collect the temperature of the cell's top cover. However, this method requires an additional insulating support for each sensor, increasing the cost of the CCS (Computer-Controlled System). Therefore, it is necessary to develop a novel fixing structure for temperature sensors in power batteries to address these issues. Utility Model Content

[0004] In view of at least one of the above-mentioned technical problems, the purpose of this utility model is to provide a fixing structure for a temperature sensing device in a power battery.

[0005] The technical solution of this utility model is:

[0006] The purpose of this utility model is to provide a fixing structure for a temperature sensing device in a power battery. The power battery includes a signal acquisition component, which includes an acquisition body, an acquisition branch line located on the side of the acquisition body, a temperature sensing device located at the end of the acquisition branch line away from the acquisition body, and a busbar fixed to the temperature sensing device. The temperature sensing device includes a temperature sensor and an insulating reinforcing plate located outside the temperature sensor. The insulating reinforcing plate has outwardly extending first splicing structures on opposite sides. The busbar has a second splicing structure that matches the first splicing structure. The temperature sensing device and the busbar are spliced ​​together through the first splicing structure and the second splicing structure.

[0007] Preferably, the first interlocking structure and the second interlocking structure are interlocking structures.

[0008] Preferably, the insulating reinforcing plate includes a plate body sleeved around the periphery of the temperature sensor and having a matching shape, and extension platforms extending outward from opposite side walls of the plate body, wherein any of the first interlocking structures is a snap-fit ​​member formed on the extension platform and extending upward.

[0009] One side of the busbar has a clearance groove or clearance opening to avoid the temperature sensing device. The second interlocking structure consists of slots that are respectively opened on the two opposite inner sidewalls of the clearance groove or clearance opening and extend inward toward the outside of the clearance groove or clearance opening. The slots are respectively engaged with the snap-fit ​​components one by one.

[0010] Preferably, any of the extension platforms is provided with a plurality of upwardly protruding protrusions that abut against the bottom surface of the busbar.

[0011] Preferably, any of the snap-fit ​​components includes two opposing and spaced-apart snap-fit ​​portions, each snap-fit ​​portion is made of an elastic material, and the space between the two snap-fit ​​portions is configured as a clearance for mutual approaching movement when the snap-fit ​​component is snapped into the corresponding slot. The outer peripheral wall of the top end of each snap-fit ​​portion extends radially outward to form a snap-fit ​​flange, and the snap-fit ​​flanges of the two snap-fit ​​portions of any snap-fit ​​component are adapted to overlap on the top surfaces of the two sides of the corresponding slot when the snap-fit ​​component is snapped into the corresponding slot.

[0012] Preferably, the outer peripheral wall of any of the said snap-fit ​​flanges is implemented as a guide edge extending downwardly.

[0013] Preferably, the two extension platforms are integrally formed with the plate body.

[0014] Preferably, any of the snap-fit ​​components is integrally formed with its corresponding extension platform.

[0015] Compared with the prior art, the advantages of this utility model are:

[0016] This utility model discloses a fixing structure for a temperature sensing device in a power battery.

[0017] 1. The insulating reinforcement plate is fixed by snap-fitting the snap-fitting parts set on it with the snap-fitting slots opened on the clearance grooves or clearance openings. The physical snap-fitting makes the structure more reliable. The structure of the snap-fitting parts and the snap-fitting slots allows the temperature sensing device to move within the slots, achieving fine-tuning of its position. It has a high fault tolerance rate. The structure of the insulating reinforcement plate is simple to process and the dimensional tolerances are easy to meet.

[0018] 2. There is no need to open grooves on the outer side wall of the insulating reinforcement plate. Instead, extension platforms are set on the two opposite side walls of the insulating reinforcement plate, and snap-fit ​​parts are set on the extension platforms. Slots are opened on the two opposite inner side walls of the clearance groove or clearance opening on the busbar. Since the busbar is made of metal and has high hardness, opening slots on the inner wall of the clearance groove or clearance opening will not have a significant impact on its strength. The snap-fit ​​parts on the extension platforms are snapped into the two slots one by one to fix the temperature sensing device. The structure is simple, the connection is reliable, and the structural strength is high.

[0019] 3. The temperature sensor collects the temperature of the top cover of the battery cell, ensuring accurate temperature acquisition with minimal error;

[0020] 4. The temperature sensing device is assembled with the busbar through an insulating reinforcing plate, which does not require the addition of new materials and has a cost advantage;

[0021] 5. When assembling the insulation reinforcement plate of the temperature sensing device with the busbar, it is not necessary to remove the busbar for assembly. The signal acquisition line will not be pulled during the assembly process, effectively preventing line damage.

[0022] 6. The reinforcing plate contacts the busbar through the bottom protrusions to prevent the busbar temperature from being conducted to the reinforcing plate and interfering with the accuracy of the temperature sensor in collecting the cell temperature. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0024] Figure 1 This is a schematic diagram of the fixing structure for the temperature sensing device in a power battery according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of a temperature sensing device used for fixing a temperature sensing device in a power battery, according to an embodiment of the present invention.

[0026] Figure 3 for Figure 2 A schematic diagram of the exploded structure of the fixed structure used for the temperature sensing device in a power battery.

[0027] The components are as follows: 10. Acquisition body; 20. Acquisition branch line; 30. Temperature sensing device; 31. Temperature sensor; 32. Insulation reinforcement plate; 321. Plate body; 322. Extension platform; 3221. Protrusion; 33. Snap-fit ​​component; 331. Snap-fit ​​part; 3310. Snap-fit ​​flange; 332. Clearance gap; 40. Busbar; 41. Clearance opening; 42. Slot. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0029] This utility model provides a fixing structure for a temperature sensing device in a power battery. See [link to relevant documentation]. Figures 1 to 3 The power battery includes a signal acquisition component, which comprises an acquisition body 10, an acquisition branch line 20, a temperature sensor 30, and a busbar 40. The acquisition body 10 is exemplarily a conventional FFC acquisition body 10, the acquisition branch line 20 is exemplarily a conventional FDC branch line, and the temperature sensor is exemplarily a conventional NTC. The acquisition branch line 20 is disposed on the side of the acquisition body 10. The temperature sensor 30 is disposed on the end of the acquisition branch line 20 away from the acquisition body 10 and is connected and fixed to the busbar 40. The temperature sensor 30 includes an inner temperature sensor 31 and an insulating reinforcing plate 32 wrapped around the outside of the temperature sensor 31. The insulating reinforcing plate 32 has outwardly protruding first splicing structures on opposite sides. Correspondingly, the busbar 40 has a second splicing structure that matches the first splicing structure. The temperature sensor 30 and the busbar 40 are spliced ​​together through the first splicing structure and the second splicing structure. This solves the problem in the prior art where slotting the outer wall of the insulating reinforcing plate 32 of the temperature sensing device 30 reduces the structural strength of the insulating reinforcing plate 32. In other words, this embodiment improves the structure of the insulating reinforcing plate 32 of the temperature sensing device 30 and the clearance slot or clearance opening 41 on the busbar 40. A first interlocking structure is added to the insulating reinforcing plate 32 without reducing its structural strength. The first and second interlocking structures of this invention can be selected from existing structures that allow for interlocking connections, such as mortise and tenon structures, snap-fit ​​structures, etc. In one preferred embodiment, the first and second interlocking structures of this invention are snap-fit ​​structures. More specifically, the insulating reinforcing plate 32 includes a square plate body 321 that matches the temperature sensor 31 and two opposing sidewalls of the plate body 321, i.e., Figure 2The bottom ends of the left and right side walls shown are respectively extended platforms 322 that protrude outwards (left wall to the left, right wall to the right). The height of each extension platform 322 is lower than the main body 321, making the insulating reinforcing plate 32 in an inverted T-shape. Specifically, each extension platform 322 has an upwardly protruding snap-fit ​​component 33 at its center. It should be noted that the main body also has a clearance protection groove (not shown) in the middle. The temperature sensor 31 is welded into this clearance protection groove, which is filled with insulating glue (not shown) to protect the temperature sensor 31. Correspondingly, one side of the busbar 40 is specifically as follows... Figure 1 As shown, there is an inward indentation on the front side, that is... Figure 1 The rearwardly recessed U-shaped clearance groove or clearance opening 41 is shown, and the two opposing inner sidewalls of the clearance groove or clearance opening 41 are also as follows: Figure 1The left and right inner walls shown have recessed slots 42 extending to the left and right, respectively, facing outwards from the clearance groove or clearance opening 41. The width of each slot 42 is less than the length of the inner wall of the corresponding clearance groove or clearance opening 41. The two slots 42 are respectively engaged with the engaging members 33 on the two extension platforms 322 of the insulating reinforcing plate 32 of the temperature sensing device 30 to form a fixed structure for the temperature sensing device 30. The fixing structure of the temperature sensing device 30 of this utility model is achieved by engaging and fixing the snap-fit ​​member 33 on the insulating reinforcing plate 32 with the snap-fit ​​groove 42 opened on the clearance groove or clearance opening 41, which physically locks the device in place and makes the structure more reliable. The snap-fit ​​member 33 and the snap-fit ​​groove 42 allow the temperature sensing device 30 to move along the length of the busbar 40, i.e., within the snap-fit ​​groove 42, for fine-tuning, resulting in high tolerance and preventing size limitations during assembly. The insulating reinforcing plate 32 is simple to manufacture and its dimensional tolerances are easy to meet. There is no need to open a groove on the outer wall of the insulating reinforcing plate 32; instead, extension platforms 322 are provided on the two opposite side walls of the insulating reinforcing plate 32. A snap-fit ​​component 33 is provided, and slots 42 are formed on the two opposing inner sidewalls of the clearance groove or clearance opening 41 on the busbar 40. Since the busbar 40 is made of metal and has high hardness, forming slots 42 on the inner wall of the clearance groove or clearance opening 41 has little impact on its strength. Moreover, after the temperature sensing device 30 is fixed by the fixing structure, the extension platform 322 is located directly below the sidewall of the clearance groove or clearance opening 41, which can play a supporting role and reduce the deformation of the sidewall of the clearance groove or clearance opening 41. The snap-fit ​​component 33 on the extension platform 322 is snapped into the two slots 42 one by one to fix the temperature sensing device 30. The structure is simple, has high connection reliability, and high structural strength. The fixing structure of the temperature sensing device 30 of this utility model allows the temperature sensing device 30 to collect the temperature of the top cover of the battery cell accurately with small error. The temperature sensing device 30 is assembled with the busbar through an insulating reinforcing plate, which does not require the addition of new materials and has a cost advantage. When assembling the insulating reinforcing plate 32 of the temperature sensing device 30 with the busbar 40, it is not necessary to remove the busbar 40 for assembly. During the assembly process, the signal acquisition line will not be pulled, effectively preventing line damage. As an alternative embodiment, the extension platform 322 may not be provided on the two outer side walls of the insulating reinforcing plate 32. That is, the insulating reinforcing plate 32 only includes the plate body 321. The first splicing structure is an outwardly protruding structure directly formed on the two outer side walls of the plate body 321, such as a locking block structure (not shown). The second splicing structure is still a slot structure (not shown) that matches the locking block structure and is opened on the two side walls of the clearance groove or clearance opening 41 of the busbar 40.

[0030] According to some preferred embodiments of the present invention, such as Figure 1As shown, any snap-fit ​​component 33 includes two opposing and spaced-apart snap-fit ​​portions 331. Each snap-fit ​​portion 331 is made of an elastic material (the specific material is not limited, but can be conventional plastic or metal spring). The gap between the two snap-fit ​​portions 331 is configured as a clearance gap 332 for the snap-fit ​​component 33 to snap into the corresponding slot 42 (because the snap-fit ​​portions 331 are made of elastic material, they will deform and move closer to each other when squeezed by the side walls of the slot 42 during installation). The outer peripheral wall of the top of each snap-fit ​​portion 331 extends radially outward to form a snap-fit ​​flange 3310, such as... Figure 2 As shown, when the two locking portions 331 of any locking member 33 are engaged in the corresponding slot 42, the locking flanges 3310 are adapted to overlap the top surfaces of both sides of the corresponding slot 42. Specifically, during installation, the busbar 40 is pressed downward or the temperature sensor 30 is pressed upward. Due to the fixed size of the slot 42 and the existence of the clearance gap 332 between the two locking portions 331 of the locking member 33, during the pressing process, the two locking portions 331 of the locking member 33 are deformed by compression and move closer to each other, so that the locking member 33 can enter the slot 42. When the locking flange 3310 at the top of the locking member 33 passes the uppermost end of the slot 42, it is no longer subjected to the compression of the inner sidewall of the slot 42. The locking portion 331 returns to the initial position, and the bottom surface of the locking flange 3310 abuts against the top surface of the slot 42, so that the temperature sensor 30 will not separate from the busbar 40. In this embodiment, the initial state of the two snap-fit ​​portions 331 of the snap-fit ​​member 33 is such that the distance between the outer wall surfaces of the two snap-fit ​​portions 331 is less than or equal to the width of the slot 42. That is, after installation, the outer wall surfaces of the two snap-fit ​​portions 331 do not contact the side walls of the slot 42 or only contact them but are not subjected to mutual squeezing force. It is sufficient for the snap-fit ​​flange 3310 to abut against the top surface of the slot 42 to prevent the temperature sensor 30 from separating from the busbar. Preferably, the outer peripheral wall surface of any snap-fit ​​flange 3310 is implemented as a downwardly inclined guide edge (not shown), that is, the snap-fit ​​flange 3310 is frustoconical. The inclined guide edge facilitates guidance during installation, making installation easier. The height of the snap-fit ​​member 33 is not particularly limited and is set according to the thickness of the busbar 40. Slightly larger or smaller heights can achieve the fixation of the temperature sensor 30 and the busbar 40, avoiding the problems of difficult assembly or easy detachment caused by the insulation reinforcement plate of the temperature sensor being too large or too small, as is the case in the prior art.

[0031] According to some preferred embodiments of the present invention, such as Figure 2As shown, any extension platform 322 is provided with several protrusions 3221 that extend upward and abut against the bottom surface of the busbar. The protrusions 3221 serve as heat insulation, ensuring that only each protrusion 3221 on the lower surface of the insulating reinforcing plate 32 of the temperature sensing device 30 contacts the busbar 40, effectively preventing the temperature of the busbar 40 from being conducted to the temperature sensing device 30 and improving the accuracy of temperature acquisition.

[0032] According to some preferred embodiments of this utility model, the two extension platforms 322 are integrally formed with the plate body 321. Any snap-fit ​​member 33 is integrally formed with its corresponding extension platform 322. This reduces the number of processing steps and lowers processing costs.

[0033] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A fixing structure for a temperature sensing device in a power battery, the power battery including a signal acquisition component, the signal acquisition component including an acquisition body, an acquisition branch line disposed on the side of the acquisition body, a temperature sensing device disposed at the end of the acquisition branch line away from the acquisition body, and a busbar fixed to the temperature sensing device, the temperature sensing device including a temperature sensor and an insulating reinforcing plate disposed outside the temperature sensor, characterized in that, The insulating reinforcing plate has outwardly protruding first interlocking structures on opposite sides, and the busbar has a second interlocking structure that matches the first interlocking structure. The temperature sensing device and the busbar are connected by interlocking through the first interlocking structure and the second interlocking structure.

2. The fixing structure according to claim 1, characterized in that, The first and second splicing structures are interlocking structures.

3. The fixing structure according to claim 2, characterized in that, The insulating reinforcing plate includes a plate body sleeved around the temperature sensor and matching in shape, and extension platforms extending outward from opposite side walls of the plate body, wherein any of the first interlocking structures is a snap-fit ​​member formed on the extension platform and extending upward. One side of the busbar has a clearance groove or clearance opening to avoid the temperature sensing device. The second interlocking structure consists of slots that are respectively opened on the two opposite inner walls of the clearance groove or clearance opening and extend outward toward the outside of the clearance groove or clearance opening. The slots are respectively engaged with the snap-fit ​​components one by one.

4. The fixing structure according to claim 3, characterized in that, Each of the extension platforms is provided with a plurality of protrusions that extend upward and abut against the bottom surface of the busbar.

5. The fixing structure according to claim 3, characterized in that, Each of the snap-fit ​​components includes two opposing and spaced-apart snap-fit ​​portions. Each snap-fit ​​portion is made of an elastic material. The space between the two snap-fit ​​portions is configured as a clearance for mutual approaching movement when the snap-fit ​​component is snapped into the corresponding slot. The outer peripheral wall of the top of each snap-fit ​​portion extends radially outward to form a snap-fit ​​flange. The snap-fit ​​flanges of the two snap-fit ​​portions of each snap-fit ​​component are adapted to overlap the top surfaces of the two sides of the corresponding slot when the snap-fit ​​component is snapped into the corresponding slot.

6. The fixing structure according to claim 5, characterized in that, The outer peripheral wall of any of the aforementioned snap-fit ​​flanges is configured as a downwardly inclined guide edge.

7. The fixing structure according to claim 3, characterized in that, The two extension platforms are integrally formed with the plate body.

8. The fixing structure according to claim 3 or 7, characterized in that, Each of the aforementioned snap-fit ​​components is integrally formed with its corresponding extension platform.

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