Temperature sensing structure, cold plate and battery pack

Abstract

The utility model provides a temperature sensing structure, a cold plate and a battery pack. The temperature sensing structure is used for temperature acquisition of the surface of a cold plate of a battery pack, and comprises a mounting seat and a temperature sensor. Wherein the mounting seat is fixedly arranged at the position, needing temperature acquisition, of the surface of the cold plate of the battery pack; the mounting seat covers the surface of the battery pack cold plate, so that an inner cavity is defined by the mounting seat and the battery pack cold plate; a mounting hole is formed in the mounting seat, and the inner cavity is communicated with the outside through the mounting hole; the temperature sensor is provided with an acquisition end for acquiring temperature; and the acquisition end is arranged on the mounting hole in a penetrating manner and is propped against the surface of the battery pack cold plate. The temperature sensor has the advantages of being high in temperature acquisition precision, firm in structure and easy to replace.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pack temperature sensing, in particular to a temperature sensing structure. The utility model also relates to a cold plate including the above temperature sensing structure, and a battery pack including the above cold plate. Background Art

[0002] With the wide application of new energy vehicles in various fields, the related supporting equipment and processes have also developed by leaps and bounds. As an energy storage device for new energy vehicles, the battery pack can provide energy for the motors and other electrical equipment of new energy vehicles by converting electrical energy and chemical energy into each other. A large amount of heat is released during the energy conversion process of the battery pack. In order to maintain the working environment temperature of the battery pack within a suitable range, a heat dissipation structure is usually integrated in the battery pack.

[0003] The cold plate is one of the commonly used heat dissipation structures for battery packs. It has a cavity inside for the coolant to flow through, and can conduct the heat inside the battery pack to the outside in the form of heat exchange during the movement of the coolant along the cavity. The temperature of the cold plate, as an important indicator of the working state of the battery pack, needs to be collected in real time, so as to provide a basis for the BMS (battery management system) to control the charging / discharging state of the battery pack.

[0004] At present, most temperature sensors are installed at the inlet / outlet positions of the cold plate, and can only collect the temperature at the inlet / outlet of the cold plate, ignoring the overall temperature distribution of the cold plate, resulting in low temperature collection accuracy of the cold plate. In the prior art, there is a related document proposing a cold plate structure, which fixes the temperature sensor on the surface of the cold plate by welding, so as to collect the temperature on the surface of the cold plate. However, once the temperature sensor welded on the surface of the cold plate fails, it is difficult to replace, and it is easy to fall off during installation and transportation. Rewelding is likely to damage the cold plate and affect its heat dissipation efficiency. Summary of the Utility Model

[0005] In view of this, the utility model aims to propose a temperature sensing structure for collecting the temperature on the surface of the cold plate of the battery pack, which has high temperature collection accuracy, and is structurally stable and easy to replace.

[0006] To achieve the above object, the technical solution of the utility model is realized as follows:

[0007] A temperature sensing structure of the utility model includes a mounting seat, which is fixed at the position on the surface of the cold plate of the battery pack where temperature collection is required; the mounting seat is buckled on the surface of the cold plate of the battery pack, and thus encloses an inner cavity with the cold plate of the battery pack; an installation hole is opened on the mounting seat, and the inner cavity is communicated with the outside through the installation hole;

[0008] A temperature sensor, having a collection end for collecting temperature; the collection end is inserted through the mounting hole and abuts against the surface of the battery pack cold plate.

[0009] Further, a threaded hole is provided on the mounting seat, and a bolt is inserted through the temperature sensor, and the bolt is in threaded cooperation with the threaded hole.

[0010] Further, the threaded hole and the bolt are configured to be two symmetrically distributed with respect to the collection end.

[0011] Further, the inner cavity is filled with a heat-conducting gel, and the heat-conducting gel wraps around the outside of the collection end.

[0012] Further, the mounting seat is configured as a hollow cylinder with an axis perpendicular to the surface of the battery pack cold plate, and the mounting hole is provided on the upper end surface of the mounting seat.

[0013] Further, a sealing ring is sleeved on the collection end, the sealing ring is made of a flexible material and abuts against the side wall of the mounting hole.

[0014] Compared with the prior art, the present utility model has the following advantages:

[0015] The temperature sensing structure of the present utility model includes a mounting seat and a temperature sensor. The temperature sensor can convert the temperature signal into an electrical signal and transmit it to related devices, thereby realizing the collection of temperature. By providing a mounting seat on the battery pack cold plate, the mounting seat with the mounting hole plays a role in maintaining the position of the temperature sensor. Compared with the direct welding method, the structure is more stable and it is easier to replace the temperature sensor. By arranging the mounting seat at the position on the battery pack cold plate where temperature collection is required, the temperature collection of the battery pack by the temperature sensor is not limited to the inlet / outlet of the cold plate. The collection end of the temperature sensor for collecting temperature is arranged in the inner cavity, so as to better avoid the influence of environmental factors on the temperature collection accuracy and has higher temperature collection accuracy.

[0016] In addition, by providing a threaded hole on the mounting seat, a mounting position can be provided for the bolt used to fix the temperature sensor. By using bolts to fix the temperature sensor, the stability and firmness of the structure of the present application can be further improved without significantly affecting the disassembly and assembly convenience. By arranging the threaded hole and the bolt to be two symmetrically distributed with respect to the collection end, the stability of the collection end can be improved, the posture of the collection end is not easily affected by environmental factors, and the temperature collection accuracy of the temperature sensor is ensured.

[0017] Secondly, by filling the inner cavity with a thermal conductive gel, better heat transfer between the collection end and the cold plate of the battery pack can be achieved, further improving the temperature collection accuracy of the temperature sensor.

[0018] Furthermore, by constructing the mounting base as a hollow cylinder with its axis perpendicular to the surface of the cold plate of the battery pack, it is beneficial to reduce the influence of welding stress on the connection structure strength between the mounting base and the cold plate. By sleeving a flexible sealing ring on the collection end, the sealing performance of the inner cavity can be improved, which is conducive to maintaining the posture of the collection end and further improving the temperature collection accuracy of the temperature sensor.

[0019] In addition, the present utility model also proposes a cold plate provided with the above temperature sensing structure, including a temperature sensing structure, which adopts the temperature sensing structure as described above.

[0020] A cold plate body, and the temperature sensing structure is arranged on the surface of the cold plate body.

[0021] Further, the temperature sensing structures are configured to be multiple and evenly distributed on the surface of the cold plate body.

[0022] The temperature sensing structure in the cold plate of the present utility model has the same beneficial effects as the above-described temperature sensing structure compared with the prior art, and will not be elaborated herein.

[0023] Secondly, by arranging the temperature sensing structures to be multiple and evenly distributed on the surface of the cold plate body, real-time temperature collection of multiple points on the surface of the cold plate body can be achieved, thereby improving the temperature monitoring effect and accuracy of the overall cold plate body.

[0024] In addition, the present utility model also proposes a battery pack provided with the above cold plate, including a cold plate, which adopts the cold plate as described above.

[0025] A battery cell module, which abuts against the cold plate.

[0026] Further, the cold plates are constructed to be two and symmetrically distributed up and down with respect to the battery cell module.

[0027] The cold plate of the battery pack of the present utility model has the same beneficial effects as the above-described cold plate compared with the prior art, and will not be elaborated herein.

[0028] Secondly, by arranging the cold plates to be two and symmetrically distributed up and down with respect to the battery cell module, heat dissipation and cooling can be simultaneously performed on the upper and lower ends of the battery cell module, ensuring the consistency of the working environment temperature of the battery cell module, which is beneficial to increasing the charge and discharge cycle times and the effective service life of the battery cell module. Description of the Drawings

[0029] The accompanying drawings, which form a part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0030] Figure 1 It is an exploded structural schematic diagram of the temperature sensing structure in the embodiment of the present application;

[0031] Figure 2 It is a sectional structural schematic diagram of the mounting base in the embodiment of the present application;

[0032] Figure 3 It is a structural schematic diagram of the cold plate in the embodiment of the present application;

[0033] Figure 4 It is a structural schematic diagram of the battery pack in the embodiment of the present application.

[0034] Description of the reference numerals:

[0035] 1. Mounting base;

[0036] 101. Inner cavity; 102. Mounting hole; 103. Threaded hole;

[0037] 2. Temperature sensor;

[0038] 201. Acquisition end; 202. Sealing ring;

[0039] 3. Bolt; 4. Thermal conductive gel; 5. Cold plate body; 6. Battery cell module. Detailed implementation manners

[0040] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will describe the specific implementation manners of the present utility model with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other implementation manners can also be obtained.

[0041] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, if terms such as "first" and "second" appear, they are also only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] Taking a temperature sensing structure, a cold plate, and a battery pack described in the present utility model as an example, the orientation terms such as "upper, lower, left, right, front, and back" used in the embodiments are defined based on the up-and-down direction (also known as the height direction, or the Z direction of the battery pack), the left-and-right direction (also known as the width direction, or the Y direction of the battery pack), and the front-and-back direction (also known as the length direction, or the X direction of the battery pack) of the battery pack. "Inside and outside" are defined based on the contour of the corresponding component. For example, the "inside" and "outside" defined based on the contour of the battery pack, with the side closer to the middle of the battery pack being the "inside" and the opposite being the "outside".

[0043] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0044] Next, reference will be made to the attached Figure 1 to the attached Figure 4 and in combination with embodiments to elaborate on the present utility model in detail.

[0045] Embodiment 1

[0046] This embodiment relates to a temperature sensing structure, which adopts a structure of arranging a mounting seat for fixing a temperature sensor at a position on the cold plate of the battery pack where temperature acquisition is required. Through the mounting seat, the relative position of the temperature sensor and the cold plate of the battery pack is fixed, replacing the existing technology of directly welding the temperature sensor on the cold plate, so as to achieve the invention purposes of higher temperature acquisition accuracy, stable structure, and easy disassembly and replacement.

[0047] Referring to Figure 1 and Figure 2 , in terms of the overall structure, the temperature sensing structure of this embodiment includes a mounting seat 1 and a temperature sensor 2. Among them, the mounting seat 1 is arranged at a position on the surface of the cold plate of the battery pack where temperature acquisition is required by welding. The mounting seat 1, because it covers the cold plate of the battery pack, encloses an inner cavity 101 with the surface of the cold plate of the battery pack. An installation hole 102 is also opened on the mounting seat 1. The inner cavity 101 is communicated with the external space of the mounting seat 1 through the installation hole 102.

[0048] The temperature sensor 2 can be fixed on the mounting hole 102 by snap connection or other detachable connection methods to ensure the convenience of installation and disassembly and easy replacement. The temperature sensor 2 has a collection end for collecting temperature. The collection end is inserted through the mounting hole 102 and abuts against the surface of the battery pack cold plate, thereby realizing the collection of temperature.

[0049] With the above settings, since the mounting seat 1 has a longer effective welding length compared to the temperature sensor 2, the mounting seat 1 welded on the battery pack cold plate has better structural stability compared to the prior art solution of directly welding the temperature sensor 2 on the surface of the battery pack cold plate. In addition, the temperature sensor 2 is installed on the mounting seat 1, and the position of its temperature collection is no longer limited to the inlet / outlet of the battery pack cold plate. Moreover, compared to the prior art solution of directly welding the temperature sensor 2 on the surface of the battery pack cold plate, it has the advantage of being easy to replace.

[0050] Refer to Figure 1 and Figure 2 For better fixing the position of the temperature sensor 2, in this embodiment, a threaded hole 103 is provided on the mounting seat 1. The inner wall of the threaded hole 103 has threads, and a bolt 3 is inserted through the temperature sensor 2. The bolt 3 is in threaded cooperation with the threaded hole 103 to form a detachable connection structure. To improve the attitude stability of the collection end in the inner cavity 101, both the bolt 3 and the threaded hole 103 are configured as two symmetrically distributed with respect to the collection end.

[0051] With the above settings, it is possible to improve the stability of the temperature sensor 2 and the attitude stability of the collection end without significantly affecting the convenience of disassembly and assembly of the temperature sensor 2, thereby achieving the invention purpose of improving the temperature collection accuracy.

[0052] Refer to Figure 1 and Figure 2 To improve the temperature collection accuracy of the temperature sensor 2, in this embodiment, a heat-conducting gel 4 is filled in the inner cavity 101. The heat-conducting gel 4 wraps around the outside of the collection end and adheres to the surface of the battery pack cold plate, enabling a better heat transfer effect between the battery pack cold plate and the collection end.

[0053] In addition, a sealing ring 202 is sleeved outside the collection end. The sealing ring 202 can be made of a flexible material such as rubber and has a circular cross-section. The sealing ring 202 abuts against the inner wall of the mounting hole 102, improving the sealing performance of the inner cavity 101. It is beneficial to improve the attitude stability of the collection end, thereby enhancing the temperature collection accuracy of the temperature sensor 2.

[0054] Based on improving the stability of the relative position between the sealing ring 202 and the mounting seat 1, a ring-shaped extension part is formed by extending the inner wall of the mounting seat 1 towards the axis of itself, and the ring-shaped extension part is fixedly arranged on the inner wall of the mounting seat 1. The extension part constitutes a position limitation for the sealing ring 202 in the axial direction of the mounting seat 1, enabling the sealing ring 202 to achieve a better sealing effect and reducing the possibility of the sealing ring 202 sliding and misaligning.

[0055] Referring to Figure 1 and Figure 2 , in order to reduce the influence of welding stress on the connection structure strength between the mounting seat 1 and the battery pack cold plate, the mounting seat 1 is configured as a cylindrical shape with its axis perpendicular to the surface of the battery pack cold plate. The mounting hole 102 is opened on the upper end surface of the mounting seat 1.

[0056] Embodiment Two

[0057] This embodiment relates to a cold plate, including the temperature sensing structure described in Embodiment One, and the cold plate body 5.

[0058] Referring to Figure 1 , Figure 2 and Figure 3 , in this embodiment, the cold plate body 5 can be an aluminum alloy plate formed by extrusion in one piece. Cavities for the coolant to flow are arranged on the cold plate body 5 by extrusion molding, as well as an inlet and an outlet communicating with the cavities. The coolant enters the cold plate body 5 from the inlet of the cavity and flows out of the cold plate body 5 from the outlet of the cavity. During the process of the coolant flowing along the cavities of the cold plate body 5, the heat in the battery pack can be transferred outside the battery pack.

[0059] The temperature sensing structure is installed at the position on the cold plate body 5 where temperature acquisition is required. In order to improve the acquisition effect of the overall temperature of the cold plate body 5, the temperature sensing structure is configured to be multiple and evenly distributed on the upper surface of the cold plate body 5.

[0060] With the above settings, by setting the temperature sensing structure to be multiple and evenly distributed on the surface of the cold plate body 5, real-time temperature acquisition of multiple points on the surface of the cold plate body 5 can be realized, thereby improving the temperature monitoring effect and accuracy of the cold plate body 5 as a whole.

[0061] Embodiment Three

[0062] This embodiment designs a battery pack, including the cold plate described in Embodiment Two, and the battery cell module 6.

[0063] Referring to Figure 1 , Figure 2 and Figure 4 , in this embodiment, the battery cell module 6 can be an integral formed by arranging multiple battery cells at a certain gap along their own thickness directions. The battery cell module 6 is also integrated with a bus bar that is electrically connected to all the battery cells.

[0064] The cold plate abuts against the battery cell module 6, and can transfer the heat generated by the battery cell module 6 to the outside of the battery pack through heat exchange. In order to improve the cooling effect of the cold plate on the battery cell module 6 and ensure the consistency of the working environment temperature of the battery cell module 6, two cold plates are provided and symmetrically distributed up and down with respect to the battery cell module 6.

[0065] With the above settings, by providing two cold plates that are symmetrically distributed up and down with respect to the battery cell module 6, heat dissipation cooling can be simultaneously performed on the upper and lower ends of the battery cell module 6, ensuring the consistency of the working environment temperature of the battery cell module 6, which is beneficial to increasing the charge and discharge cycle times and the effective service life of the battery cell module 6.

[0066] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A temperature sensing structure for collecting the temperature on the surface of the cold plate of a battery pack, characterized in that: It includes a mounting base fixedly arranged at the position on the surface of the cold plate of the battery pack where temperature collection is required; The mounting base is buckled on the surface of the cold plate of the battery pack, thus enclosing an inner cavity with the cold plate of the battery pack; the mounting base is provided with mounting holes, and the inner cavity communicates with the outside through the mounting holes; A temperature sensor having a collection end for collecting temperature; the collection end is inserted through the mounting hole and abuts against the surface of the cold plate of the battery pack.

2. The temperature sensing structure according to claim 1, characterized in that: The mounting base is provided with threaded holes, and the temperature sensor is provided with bolts, and the bolts are in threaded cooperation with the threaded holes.

3. The temperature sensing structure according to claim 2, characterized in that: The threaded holes and the bolts are configured to be two symmetrically distributed about the collection end.

4. The temperature sensing structure according to claim 1, characterized in that: The inner cavity is filled with a heat-conducting gel, and the heat-conducting gel wraps around the outside of the collection end.

5. The temperature sensing structure according to claim 1, characterized in that: The mounting base is configured as a hollow cylinder with an axis perpendicular to the surface of the cold plate of the battery pack, and the mounting holes are opened on the upper end surface of the mounting base.

6. The temperature sensing structure according to any one of claims 1 to 5, characterized in that: A sealing ring is sleeved on the collection end, the sealing ring is made of a flexible material and abuts against the side wall of the mounting hole.

7. A cold plate for cooling a battery pack, characterized in that: It includes a temperature sensing structure, adopting the temperature sensing structure according to any one of claims 1 to 6; a cold plate body, and the temperature sensing structure is arranged on the surface of the cold plate body.

8. The cold plate according to claim 7, characterized in that: The temperature sensing structures are configured to be multiple and evenly distributed on the surface of the cold plate body.

9. A battery pack, characterized in that: It includes a cold plate, adopting the cold plate according to any one of claims 7 to 8; A battery cell module in contact with the cold plate.

10. The battery pack according to claim 9, characterized in that: The cold plates are configured to be two symmetrically distributed up and down with respect to the battery cell module.

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