Battery pack temperature monitor

Abstract

The invention relates to a battery pack temperature monitor, and belongs to the field of battery temperature monitoring, the battery pack temperature monitor comprises a mounting shell, the mounting shell is clamped on a battery pack cover plate of a battery pack assembly, one end, close to a battery cell of the battery pack assembly, of the mounting shell is detachably connected with a fixing shell, and the fixing shell is provided with an elastic piece; the side, deviating from the fixing shell, of the elastic piece is in contact with the inner wall of the mounting shell, a heat conduction shell is arranged in the fixing shell, a temperature sensor is arranged in the heat conduction shell, and the side, deviating from the fixing shell, of the heat conduction shell is in contact with the battery cell. The elastic piece enables the heat conduction shell to make contact with the battery cell of the battery pack assembly, after the heat conduction shell is heated, the temperature sensor can monitor the temperature of the battery cell in real time, the temperature response time is saved, the temperature error is reduced, and higher guarantee is provided for driving safety.

Description

Technical Field

[0001] The present invention belongs to the field of battery temperature monitoring, and in particular relates to a battery pack temperature monitor. Background Art

[0002] The temperature of a battery pack will rise rapidly before a failure occurs. Most battery temperature monitoring sensors on the market use an indirect contact battery method, that is, they provide monitoring data to the BMS system by monitoring the temperature changes of the nickel sheet on the aluminum guide sheet between the battery cells. During this process, there is too much temperature loss and response time loss, and the battery cell temperature cannot be monitored in real time. Summary of the Invention

[0003] In response to the above problems, the present invention realizes real-time monitoring of battery cell temperature, significantly shortens temperature response time and reduces temperature error, thus providing higher protection for driving safety.

[0004] A battery pack temperature monitor includes a mounting shell, which is clamped on the battery pack cover of the battery pack assembly. The mounting shell is detachably connected to a fixed shell at one end of the mounting shell close to the battery cell of the battery pack assembly. The fixed shell is provided with an elastic member, and the side of the elastic member facing away from the fixed shell contacts the inner wall of the mounting shell. A heat-conducting shell is provided in the fixed shell, and a temperature sensor is provided in the heat-conducting shell. The side of the heat-conducting shell facing away from the fixed shell contacts the battery cell.

[0005] Furthermore, a mounting groove is provided on the fixing shell, and a heat-conducting shell is provided in the mounting groove.

[0006] Furthermore, a clamping slot is provided on a side of the fixing shell facing away from the installation slot, and an elastic member is clamped in the clamping slot.

[0007] Furthermore, an accommodating groove is provided on the inner wall of the installation shell, and a side of the elastic member facing away from the clamping groove contacts the accommodating groove.

[0008] Furthermore, the elastic member includes a support piece, both ends of the support piece are provided with inclined pieces, the end of the inclined piece away from the support piece is provided with an inclined contact piece, the contact piece contacts the card slot, and the side of the support piece away from the fixed shell contacts the accommodating groove.

[0009] Furthermore, the side of the card slot that contacts the inner side of the contact piece is an inclined surface.

[0010] Furthermore, a guide column is provided on the outer wall of the fixed shell, a limiting groove is provided on the inner wall of the installation shell, and the guide column is arranged in the limiting groove.

[0011] Furthermore, a clamping hole is provided on the installation shell, and a clamping block is provided on the outer wall of the fixing shell, and the clamping block is arranged in the clamping hole.

[0012] Furthermore, a temperature measuring groove is provided on the battery pack cover of the battery pack assembly, and a snap block is provided on the outer wall of the mounting shell, and the snap block is snapped into the temperature measuring groove.

[0013] Furthermore, a filler is provided in the heat-conducting shell, and the heat-conducting shell is connected to a temperature sensor through the filler.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The elastic member in the present invention enables the heat-conducting shell to contact the battery cell of the battery pack assembly. After the heat-conducting shell is heated, the temperature sensor can monitor the temperature of the battery cell in real time, which not only saves the time of temperature response, but also reduces the temperature error and provides a higher guarantee for driving safety.

[0015] The elastic member in the present invention acts as a spring and is compressed to absorb the interference portion, thereby achieving elastic contact between the heat-conducting shell and the battery core in real time, thereby ensuring the effectiveness of temperature monitoring.

[0016] The present invention significantly improves the temperature monitoring response time of the battery core, thereby improving the safety factor.

[0017] The mounting shell and the fixing shell in the present invention play the role of protecting and supporting the elastic member.

[0018] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 shows a schematic structural diagram of a battery pack temperature monitor; Figure 2 An exploded view of a battery pack temperature monitor is shown; Figure 3 Shows a schematic structural diagram of the fixed shell; Figure 4 Shows a schematic structural diagram of the installation shell; Figure 5 shows a schematic structural diagram of the accommodating tank; Figure 6 shows a schematic structural diagram of an elastic member; Figure 7 Shows a schematic diagram of the connection between the fixed shell, the mounting shell and the heat-conducting shell; Figure 8 Shown Figure 7 Cross-sectional view of AA; Figure 9 shows a schematic diagram of a battery pack assembly; Figure 10 Shown Figure 9 A partial enlarged view of B in the middle; Figure 11 Shows a schematic diagram of the battery pack temperature monitor installed in a temperature measuring tank; Figure 12 A schematic diagram showing the contact between the thermally conductive shell and the battery cell is shown.

[0021] Figure numerals: 1. battery pack assembly; 11. battery pack cover; 111. temperature measuring chamber; 12. battery cell; 2. mounting shell; 21. accommodation slot; 22. limiting slot; 23. snap-in hole; 24. snap block; 25. lightweight hole; 3. fixing shell; 31. snap slot; 311. first limiting slot; 312. second limiting slot; 32. guide column; 33. snap block; 34. mounting slot; 4. elastic member; 41. support plate; 42. inclined plate; 43. contact plate; 5. heat-conducting shell; 51. filler; 6. temperature sensor. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0023] Figure 1 Figure 2 shows the structural diagram of the battery pack temperature monitor. Figure 1 As shown, a battery pack temperature monitor includes a mounting shell 2, the mounting shell 2 is clamped on the battery pack cover 11 of the battery pack assembly 1, and the end of the mounting shell 2 close to the battery cell 12 of the battery pack assembly 1 is detachably connected to the fixed shell 3, the fixed shell 3 is provided with an elastic member 4, and the side of the elastic member 4 facing away from the fixed shell 3 contacts the inner wall of the mounting shell 2, the fixed shell 3 is provided with a heat-conducting shell 5, and the heat-conducting shell 5 is provided with a temperature sensor 6. Figure 12 A schematic diagram showing the contact between the heat-conducting shell 5 and the battery core 12 is shown. Figure 12 As shown, the side of the heat-conducting shell 5 facing away from the fixed shell 3 is in contact with the battery core 12 .

[0024] The battery pack temperature monitor uses the elastic member 4 to make the heat-conducting shell 5 contact with the battery cell 12 of the battery pack assembly 1. After the heat-conducting shell 5 is heated, the temperature sensor 6 can monitor the temperature of the battery cell 12 in real time, which not only saves the time of temperature response, but also reduces the temperature error and provides a higher guarantee for driving safety.

[0025] Specifically, the heat-conducting shell 5 may be, but is not limited to, an aluminum shell.

[0026] Specifically, the material of the fixing shell 3 may be but is not limited to plastic.

[0027] In some embodiments, the shape of the heat-conducting shell 5 can be selected but not limited to a rectangle; the rectangular heat-conducting shell 5 is convenient for filling the filler 51 and thereby limits the position of the temperature sensor 6 .

[0028] Figure 2 An exploded diagram of the battery pack temperature monitor is shown in FIG. Figure 2 As shown, in some embodiments, a mounting groove 34 is provided on the fixed shell 3 , and a heat-conducting shell 5 is provided in the mounting groove 34 ; the mounting groove 34 provides mounting conditions for the heat-conducting shell 5 .

[0029] Specifically, the heat-conducting shell 5 is embedded in the mounting groove 34 and is formed by injection molding. This method is a prior art and will not be described in detail here.

[0030] Figure 3 FIG. 3 shows a schematic structural diagram of the fixed shell 3. Figure 3 As shown, in some embodiments, a slot 31 is provided on the side of the fixed shell 3 facing away from the installation slot 34, and an elastic member 4 is fixed in the slot 31; the slot 31 provides installation conditions for the elastic member 4; the elastic member 4 acts as a spring and is interference-fitted in the slot 31, supporting and ensuring that the thermally conductive shell 5 is always in close contact with the battery cell 12.

[0031] In some embodiments, the card slot 31 includes a first limiting groove 311 and a second limiting groove 312, and the first limiting groove 311 and the second limiting groove 312 are symmetrically arranged on the fixed shell 3, one end of the elastic member 4 is placed in the first limiting groove 311, and the other end of the elastic member 4 is placed in the second limiting groove 312; the first limiting groove 311 and the second limiting groove 312 provide installation conditions for the elastic member 4 and provide movement space when the elastic member 4 is squeezed.

[0032] Figure 5 FIG. 2 shows a schematic structural diagram of the accommodating tank 21. Figure 5As shown, in some embodiments, the inner wall of the mounting shell 2 is provided with a receiving groove 21, and the side of the elastic member 4 facing away from the card slot 31 is in contact with the receiving groove 21; the receiving groove 21 provides a receiving space for the side of the elastic member 4 facing away from the card slot 31, providing a guarantee for the elastic member 4 to act as a spring, thereby achieving elastic contact of the thermal conductive shell 5 against the battery cell 12 in real time.

[0033] In some embodiments, the mounting shell 2 is provided with a lightweight hole 25 ; the provision of the lightweight hole 25 can make the mounting shell 2 lightweight.

[0034] Figure 6 Schematic diagram of the structure of the elastic member 4 is shown. Figure 6 As shown, in some embodiments, the elastic member 4 includes a support piece 41, both ends of the support piece 41 are provided with an inclined piece 42, and an end of the inclined piece 42 away from the support piece 41 is provided with an inclined contact piece 43, and the contact piece 43 contacts the card slot 31. Figure 8 Shown Figure 7 The cross-sectional view of AA in Figure 8 As shown, the side of the support piece 41 facing away from the fixed shell 3 is in contact with the accommodating groove 21; the slot 31 provides an accommodating space for the contact piece 43; the accommodating groove 21 provides an accommodating space for the support piece 41; the side of the support piece 41 facing away from the slot 31 is in contact with the accommodating groove 21, and the contact piece 43 is in contact with the slot 31. When the mounting shell 2 squeezes the support piece 41, the inclined piece 42 transfers the force to the contact piece 43, and the contact piece 43 transfers the force to the fixed shell 3. The elastic member 4 plays an elastic role, absorbing the interference part during the compression process of the mounted shell 2, so that the heat-conducting shell 5 in the fixed shell 3 is in real time close to the battery cell 12, thereby ensuring the effectiveness of temperature monitoring.

[0035] Specifically, the contact piece 43 at one end of the support piece 41 contacts the first limiting groove 311 , and the contact piece 43 at the other end of the support piece 41 contacts the second limiting groove 312 .

[0036] Specifically, the material of the elastic member 4 may be but is not limited to stainless steel.

[0037] In some embodiments, the side of the slot 31 that contacts the inner side of the contact piece 43 is an inclined surface, which facilitates the transmission of force and presses the fixing shell 3 downward, thereby achieving real-time close contact between the heat-conducting shell 5 and the battery cell 12 .

[0038] Specifically, the sides of the first limiting groove 311 and the second limiting groove 312 that are in contact with the contact piece 43 are both inclined surfaces.

[0039] Figure 7 FIG. 1 shows a schematic diagram of the connection between the fixing shell 3, the mounting shell 2 and the heat-conducting shell 5. Figure 7As shown, in some embodiments, a guide column 32 is provided on the outer wall of the fixed shell 3, and a limiting groove 22 is provided on the inner wall of the mounting shell 2, and the guide column 32 is arranged in the limiting groove 22; the limiting groove 22 provides installation conditions for the guide column 32, and the limiting groove 22 limits the position of the guide column 32, thereby achieving the purpose of assembling the fixed shell 3 and the mounting shell 2, and ensuring the connectivity between the two.

[0040] Figure 4 Schematic diagram of the structure of the installation shell 2 is shown. Figure 4 As shown, in some embodiments, the mounting shell 2 is provided with a snap-in hole 23, and the outer wall of the fixed shell 3 is provided with a snap-in block 33, and the snap-in block 33 is arranged in the snap-in hole 23; the snap-in hole 23 provides installation conditions for the snap-in block 33, and the snap-in connection between the snap-in block 33 and the snap-in hole 23 can ensure the connectivity between the mounting shell 2 and the fixed shell 3, and can also enable the elastic member 4 to act as a spring.

[0041] Figure 9 Schematic diagram of the battery pack assembly 1 is shown. Figure 9 As shown, in some embodiments, Figure 10 Shown Figure 9 A partial enlarged view of B in the figure, as shown in Figure 10 As shown, a temperature measuring groove 111 is provided on the battery pack cover 11 of the battery pack assembly 1, and a snap block 24 is provided on the outer wall of the mounting shell 2, and the snap block 24 is snapped into the temperature measuring groove 111; the temperature measuring groove 111 can provide installation conditions for the mounting shell 2, and can also provide a clamping force to the mounting shell 2 through the snap block 24, so that the elastic part 4 is compressed, thereby realizing the elastic contact of the heat-conducting shell 5 against the battery cell 12 in real time, thereby ensuring the effectiveness of temperature monitoring.

[0042] In some embodiments, a filler 51 is provided in the heat-conducting shell 5 , and the heat-conducting shell 5 is connected to the temperature sensor 6 through the filler 51 ; the heat-conducting shell 5 provides filling conditions for the filler 51 ; and the filler 51 provides connection conditions for the heat-conducting shell 5 and the temperature sensor 6 .

[0043] Specifically, the filler 51 may be selected from, but not limited to, epoxy glue. Epoxy glue is a prior art, and thus will not be described in detail herein.

[0044] Specifically, the temperature sensor 6 may be selected from but not limited to an NTC temperature sensor 6 .

[0045] The working principle of the battery pack temperature monitor is as follows: The elastic member 4 enables the heat-conducting shell 5 to contact the battery cell 12 of the battery pack assembly 1. After the heat-conducting shell 5 is heated, the temperature sensor 6 can monitor the temperature of the battery cell 12 in real time, which not only saves the time of temperature response, but also reduces the temperature error and provides a higher guarantee for driving safety.

[0046] Among them, after the heat-conducting shell 5 and the fixed shell 3 are assembled, the temperature sensor 6 is inserted into the heat-conducting shell 5 and the filler 51 is added. After the filler 51 solidifies, it limits the position of the temperature sensor 6. Then, one end of the elastic member 4 is placed in the first limiting groove 311, and the other end is placed in the second limiting groove 312. Then, the guide column 32 of the fixed shell 3 is aligned with the limiting groove 22, and the assembly is performed so that the guide column 32 is completely restricted in the groove limiting groove 22. At the same time, the support piece 41 of the elastic member 4 is also in contact with the accommodating groove 21. Then, the fixed shell 3 is pressed, and while squeezing the support piece 41, the block 33 on the fixed shell 3 is clamped in the clamping hole 23 of the mounting shell 2 to complete the assembly of the battery pack temperature monitor. Figure 11 FIG1 shows a schematic diagram of the installation of a battery pack temperature monitor in a temperature measuring tank 111. Figure 11 As shown, the assembled battery pack temperature monitor is adjusted in direction, with the mounting shell 2 on top and the thermal shell 5 on the bottom, and one side is tilted to enter the temperature measuring tank 111. After adjusting the position, press the other side so that the other side also enters the temperature measuring tank 111, so that the snap block 24 is snapped into the temperature measuring tank 111, and at the same time, the thermal shell 5 is close to the battery cell 12, thereby achieving the purpose of real-time detection of the battery cell 12 temperature.

[0047] Specifically, the wire of the temperature sensor 6 is directly connected to the battery pack BMS, that is, connected to the pressure and temperature sampling connector on the battery pack cover 11, and the real-time temperature monitoring data of the temperature sensor 6 is received through the BMS. This is the existing technology, so it will not be repeated here.

[0048] Specifically, BMS refers to a battery management system.

[0049] When a battery malfunctions and generates heat, the temperature of the battery cell 12 rises dramatically. This temperature change is promptly detected by the temperature sensor 6, which transmits this rapid temperature change to the BMS. The BMS then identifies the fault and instantly disconnects the battery, reducing the risk of battery damage, combustion, or other adverse consequences. Simultaneously, the BMS prompts passengers to quickly exit the vehicle through alarm signals such as large-screen displays and voice prompts. A few seconds of escape time are extremely precious, and the improved temperature response time of this embodiment significantly reduces the probability of casualties.

[0050] Response time test experiment: The "T63" formula is commonly used for testing. Specifically, the battery pack temperature detector rapidly switches from 25°C to 85°C in oil, and the time required to reach 62.92°C is monitored during this process. This yields a table of measured temperature monitoring response time data. See Table 1 for details.

[0051]

[0052] Table 1 As can be seen from Table 1, the response time of this embodiment is 3.2~4.1s, while the temperature monitoring response time of the battery temperature monitoring sensor currently using indirect contact with the battery is 41-50s. The response in this embodiment is faster, which significantly improves the temperature monitoring response time of the battery cell 12, thereby improving the safety factor.

[0053] Specifically, 62.92°C is obtained through the T63 formula, namely: T63=(85-25)×63.2%+25=62.92℃ Among them, 25 refers to the room temperature of 25°C; 63.2% refers to the parameters specified in the national standard GBT 6663.1.

[0054] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack temperature monitor, characterized in that: The invention comprises a mounting shell (2), wherein the mounting shell (2) is clamped on a battery pack cover (11) of a battery pack assembly (1), and an end of the mounting shell (2) close to the battery cell (12) of the battery pack assembly (1) is detachably connected to a fixing shell (3), wherein an elastic member (4) is provided on the fixing shell (3), and a side of the elastic member (4) facing away from the fixing shell (3) contacts the inner wall of the mounting shell (2), wherein a heat-conducting shell (5) is provided in the fixing shell (3), wherein a temperature sensor (6) is provided in the heat-conducting shell (5), and a side of the heat-conducting shell (5) facing away from the fixing shell (3) contacts the battery cell (12).

2. The battery pack temperature monitor according to claim 1, wherein: A mounting groove (34) is provided on the fixed shell (3), and a heat-conducting shell (5) is provided in the mounting groove (34).

3. The battery pack temperature monitor according to claim 2, characterized in that: A clamping slot (31) is provided on a side of the fixed shell (3) facing away from the installation slot (34), and an elastic member (4) is clamped in the clamping slot (31).

4. The battery pack temperature monitor according to claim 3, characterized in that: An accommodating groove (21) is provided on the inner wall of the mounting shell (2), and a side of the elastic member (4) facing away from the clamping groove (31) contacts the accommodating groove (21).

5. The battery pack temperature monitor according to claim 4, characterized in that: The elastic member (4) comprises a supporting piece (41), both ends of the supporting piece (41) are provided with inclined pieces (42), an end of the inclined piece (42) away from the supporting piece (41) is provided with an inclined contact piece (43), the contact piece (43) is in contact with the card slot (31), and the side of the supporting piece (41) facing away from the fixed shell (3) is in contact with the accommodating groove (21).

6. The battery pack temperature monitor according to claim 5, characterized in that: The side where the card slot (31) fits against the inner side of the contact piece (43) is an inclined surface.

7. The battery pack temperature monitor according to claim 1, wherein: A guide column (32) is provided on the outer wall of the fixed shell (3), a limiting groove (22) is provided on the inner wall of the installation shell (2), and the guide column (32) is arranged in the limiting groove (22).

8. The battery pack temperature monitor according to claim 1, wherein: A clamping hole (23) is provided on the installation shell (2), a clamping block (33) is provided on the outer wall of the fixed shell (3), and the clamping block (33) is arranged in the clamping hole (23).

9. The battery pack temperature monitor according to claim 1, wherein: A temperature measuring groove (111) is provided on the battery pack cover plate (11) of the battery pack assembly (1), and a buckle block (24) is provided on the outer wall of the mounting shell (2), and the buckle block (24) is snapped into the temperature measuring groove (111).

10. The battery pack temperature monitor according to any one of claims 1 to 9, characterized in that: A filler (51) is provided in the heat-conducting shell (5), and the heat-conducting shell (5) is connected to a temperature sensor (6) via the filler (51).

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