Wall-attached temperature sensor and battery pack

Abstract

The utility model relates to an adherent temperature sensor and battery pack, adherent temperature sensor includes encapsulation casing, thermistor and connecting wire, encapsulation casing has the accommodation cavity, encapsulation casing forms the arc-shaped mounting surface that is suitable for attaching the cylindrical cell side wall, thermistor is encapsulated in the accommodation cavity, and the connecting wire is connected with the thermistor. A heat conducting part is arranged in the area, close to the thermistor, of the arc-shaped mounting surface, one end of the connecting wire is connected with the thermistor, and the other end of the connecting wire is led out of the packaging shell. The wall-attached temperature sensor can be mounted on the side wall of the cylindrical battery cell more easily through the arc-shaped mounting surface used for being attached to the side wall of the cylindrical battery cell, and the heat conduction efficiency between the thermistor and the cylindrical battery cell can be improved through the heat conduction part, so that the temperature measurement of the wall-attached temperature sensor is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of NTC temperature sensors, in particular to a wall-mounted temperature sensor and a battery pack. Background Art

[0002] At present, people have higher and higher requirements for the safety of energy storage battery packs. In order to ensure the stable, safe and efficient operation of energy storage battery packs, it is necessary to monitor their temperature so that the BMS system can make corresponding control. There are many places where the battery module needs to monitor the temperature. The temperature needs to be monitored on the side of the cylindrical battery cell. Since the side of the cylindrical battery cell is an arc surface, the temperature sensor of the conventional structure is difficult to fit well on the side of the cylindrical battery cell, resulting in low thermal conductivity and low temperature measurement accuracy. Therefore, it is necessary to develop a temperature sensor that meets the use requirements. Utility Model Content

[0003] The main purpose of the utility model is to provide a wall-mounted temperature sensor and a battery pack, aiming to solve the problem that conventional temperature sensors are difficult to install on the side of a cylindrical battery cell and have low thermal conductivity efficiency.

[0004] To achieve the above-mentioned purpose, the utility model proposes a wall-attached temperature sensor, including a packaging shell, a thermistor and a connecting wire, the packaging shell having a accommodating cavity, the packaging shell forming an arc-shaped mounting surface suitable for adhering to the side wall of a cylindrical battery cell, the thermistor being packaged in the accommodating cavity, a heat-conducting portion being provided on the arc-shaped mounting surface in an area close to the thermistor, one end of the connecting wire being connected to the thermistor, and the other end being led out of the packaging shell.

[0005] According to some embodiments of the utility model, the heat-conducting portion includes a glue storage groove recessed on the arc-shaped mounting surface, and the glue storage groove is filled with thermal conductive silicone grease.

[0006] According to some embodiments of the present invention, a projection area of ​​the thermistor toward the side wall of the cylindrical battery core is located within a projection area of ​​the heat conducting portion toward the side wall of the cylindrical battery core.

[0007] According to some embodiments of the present invention, the thermistor is attached to the inner wall of the accommodating cavity close to the heat conducting portion.

[0008] According to some embodiments of the present utility model, the packaging shell includes an arc-shaped main body portion having the arc-shaped mounting surface, and a mounting protrusion protruding from one end of the arc-shaped main body portion away from the arc-shaped mounting surface, the accommodating cavity includes a mounting cavity defined and formed on the mounting protrusion, and the thermistor is packaged in the mounting cavity.

[0009] According to some embodiments of the utility model, the arc-shaped main body defines a glue storage cavity, and the glue storage cavity is connected to the installation cavity to form the accommodating cavity.

[0010] According to some embodiments of the present invention, a glue overflow hole communicating with the glue storage cavity is formed on the arc-shaped main body.

[0011] According to some embodiments of the present invention, a connector is provided at one end of the connecting wire away from the thermistor.

[0012] The utility model also provides a battery pack, including a battery box and at least one battery module arranged in the battery box, and also includes the above-mentioned wall-attached temperature sensor, the battery module includes a cylindrical battery core, and the packaging shell is attached to the side wall of the cylindrical battery core.

[0013] According to some embodiments of the present invention, the packaging shell is bonded to the side wall of the cylindrical battery core.

[0014] The utility model has at least the following beneficial effects:

[0015] In the utility model, the packaging shell is formed with an arc-shaped mounting surface for adhering to the side wall of the cylindrical battery cell. The packaging shell can be well fitted with the arc-shaped surface of the side wall of the cylindrical battery cell through the arc-shaped mounting surface, which is convenient for installing the temperature sensor on the cylindrical battery cell. A heat-conducting portion is provided on the arc-shaped mounting surface in an area close to the thermistor. The heat-conducting portion can improve the heat conduction efficiency between the thermistor and the cylindrical battery cell, thereby making the temperature measurement of the wall-mounted temperature sensor more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a wall-attached temperature sensor provided in an embodiment of the utility model;

[0018] Figure 2 for Figure 1 A schematic diagram of the structure of the packaging shell;

[0019] Figure 3 for Figure 2 A schematic side view of the packaging shell;

[0020] Figure 4 for Figure 3A schematic cross-sectional view of the packaging shell;

[0021] Figure 5 for Figure 1 Schematic diagram of the thermistor structure in ;

[0022] Figure 6 for Figure 5 Schematic diagram of the thermistor (encapsulated in an encapsulating resin layer);

[0023] Figure 7 Schematic diagram of the wall temperature sensor installed on the side wall of the cylindrical battery cell.

[0024] Description of reference numerals:

[0025] 100-wall temperature sensor; 1-packaging shell; 11-accommodating cavity; 111-installation cavity; 112-glue storage cavity; 12-arc-shaped installation surface; 13 heat conduction part; 131-glue storage groove; 14-glue overflow hole; 15-arc-shaped main body; 16-installation protrusion; 2-thermistor; 3-connecting wire; 4-encapsulation resin layer; 5-connector; 200-cylindrical battery cell. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. 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 the utility model.

[0029] The utility model provides a wall-mounted temperature sensor and a battery pack. Figure 1-Figure 7 A specific embodiment of a wall-attached temperature sensor provided by the utility model.

[0030] like Figure 1 The embodiment of the utility model provides a wall-attached temperature sensor 100, including a packaging shell 1, a thermistor 2 and a connecting wire 3, the packaging shell 1 has a accommodating cavity 11, the packaging shell 1 is formed with an arc-shaped mounting surface 12 suitable for attaching to the side wall of a cylindrical battery cell 200, the thermistor 2 is packaged in the accommodating cavity 11, and a heat-conducting portion 13 is provided on the arc-shaped mounting surface 12 near the thermistor 2. One end of the connecting wire 3 is connected to the thermistor 2, and the other end is led out of the packaging shell 1.

[0031] In the utility model, the packaging shell 1 is formed with an arc-shaped mounting surface 12 for adhering to the side wall of the cylindrical battery cell 200. The packaging shell 1 can be well fitted with the arc-shaped surface of the side wall of the cylindrical battery cell 200 through the arc-shaped mounting surface 12, so that the temperature sensor can be installed on the cylindrical battery cell 200. A heat-conducting portion 13 is provided in the area close to the thermistor 2 on the arc-shaped mounting surface 12. The heat-conducting portion 13 can improve the heat conduction efficiency between the thermistor 2 and the cylindrical battery cell 200, thereby making the temperature measurement of the wall-mounted temperature sensor 100 more accurate.

[0032] It is understandable that in order to enable the arc-shaped mounting surface 12 to fit and abut against the side wall of the cylindrical battery cell 200 , this can generally be achieved by setting the curvature of the arc-shaped mounting surface 12 to be the same as the curvature of the side wall of the cylindrical battery cell 200 .

[0033] It should be noted that there is no specific limitation on the connection method between the thermistor 2 and the connecting wire 3. In some embodiments, one end of the connecting wire 3 is welded to two leads of the thermistor 2 to connect the thermistor 2 in series to the connecting wire 3.

[0034] It can be understood that the heat conducting portion 13 is not specifically limited, and it only needs to be able to improve the heat conduction efficiency of the thermistor 2 to the side wall of the cylindrical battery cell 200. It can be a method of coating a heat conducting layer on the arc-shaped mounting surface 12. In some embodiments, the heat conducting portion 13 includes a glue storage tank 131 recessed on the arc-shaped mounting surface 12, and the glue storage tank 131 is filled with thermal conductive silicone grease. The recessed glue storage tank 131 can reduce the thickness of the shell between the thermistor 2 and the side wall of the battery cell, and then fill the thermal conductive silicone grease with excellent thermal conductivity to replace the original Some shells can greatly improve the thermal conductivity efficiency so that the temperature measurement of the wall temperature sensor 100 is more accurate. It is worth mentioning that in this solution, since the glue storage tank 131 is arranged on the arc-shaped mounting surface 12, after filling with thermal grease, the arc-shaped surface shape of the arc-shaped mounting surface 12 can continue to be maintained, thereby ensuring that the heat-conducting part 13 and the side wall of the cylindrical battery cell 200 have a larger fitting area, further improving the thermal conductivity efficiency, and by providing the glue storage tank 131, the use of materials can be reduced, the production cost can be reduced, and it is easy to process, which is conducive to mass production.

[0035] Specifically, in some embodiments, the projection area of ​​the thermistor 2 toward the side wall of the cylindrical battery cell 200 is located within the projection area of ​​the heat conducting portion 13 toward the side wall of the cylindrical battery cell 200. In this way, it can be ensured that the thermistor 2 can completely receive the heat transferred by the heat conducting portion 13, thereby greatly improving the thermal conductivity efficiency. In this embodiment, the glue storage tank 131 with a cross-sectional area larger than the cross-sectional area of ​​the thermistor 2 is usually opened.

[0036] Specifically, in some embodiments, the thermistor 2 is attached to the inner wall of the accommodating cavity 11 near the heat conducting portion 13. In this way, the gap distance between the thermistor 2 and the heat conducting portion 13 can be reduced, so that the thermistor 2 can directly receive the heat transferred from the inner wall of the accommodating cavity 11 near the heat conducting portion 13, thereby greatly improving the heat conduction efficiency.

[0037] Specifically, there is no specific limitation on the packaging method of the thermistor 2, and the thermistor 2 can be packaged in the packaging shell 1 through a fixed installation structure. In some embodiments, the accommodating cavity 11 is filled with potting glue. In this way, the potting glue can be pre-filled in the accommodating cavity 11, and then the thermistor 2 is installed in the accommodating cavity 11. After the potting glue is fixed and formed, the packaging is completed. The thermistor 2 is packaged by the potting glue, which can play a role of sealing and shockproof. Preferably, the potting glue adopts epoxy resin with high thermal conductivity.

[0038] Specifically, in some embodiments, the packaging shell 1 includes an arcuate main body 15 having the arcuate mounting surface 12, and a mounting protrusion 16 protruding from one end of the arcuate main body 15 away from the arcuate mounting surface 12, the accommodating cavity 11 includes a mounting cavity 111 defined and formed on the mounting protrusion 16, and the thermistor 2 is packaged in the mounting cavity 111, wherein the arcuate main body 15 is suitable for being attached to the side wall of the battery cell, and the mounting protrusion 16 protruding from the arcuate main body 15 can provide an installation space for the thermistor 2 without changing the shape of the arcuate mounting surface 12 of the arcuate main body 15, which is conducive to the miniaturized design of the product. It should be noted that the mounting cavity 111 can be a cavity formed in the shell of the mounting protrusion 16.

[0039] Specifically, in some embodiments, the arc-shaped main body 15 defines a glue storage cavity 112, and the glue storage cavity 112 is connected with the installation cavity 111 to form the accommodating cavity 11. Compared with only opening a cavity in the installation protrusion 16, in this example, a cavity is also opened in the arc-shaped main body 15, and the thermistor 2 can be packaged by filling it with potting glue. In this way, the overall weight of the packaging shell 1 can be reduced, which is beneficial to the lightweight design of the product. It should be noted that the glue storage cavity 112 can be a cavity formed inside the shell of the arc-shaped main body 15, which is used to store the filled potting glue.

[0040] Specifically, considering that when the accommodating cavity 11 is filled with potting glue, there is a possibility that too much potting glue is filled, causing the packaging shell 1 to be deformed and affecting the bonding between the packaging shell 1 and the battery cell, which in turn affects the accuracy of the temperature measurement by the wall temperature sensor 100, in some embodiments, a glue overflow hole 14 connected to the glue storage cavity 112 is formed on the arc-shaped main body 15. In this way, excess potting glue will flow out from the glue storage cavity 112 from the glue overflow hole 14, and will not affect the shaping of the potting glue in the installation cavity 111, that is, it will not affect the packaging stability of the thermistor 2. After the potting glue in the accommodating cavity 11 is fixed and formed to encapsulate the thermistor 2, the potting glue at the glue overflow hole 14 can be cut off.

[0041] Specifically, the thermistor 2 is encapsulated in the encapsulating resin layer 4, and one end of the connecting wire 3 extends into the encapsulating resin layer 4 and is connected to the thermistor 2. The connecting wire 3 can be connected to the thermistor 2 by automated welding technology, which can ensure a qualified tensile force value and a good welding effect. In this embodiment, the encapsulating resin layer 4 is made of a high thermal conductivity epoxy resin, which has high and low temperature impact resistance. After the thermistor 2 is coated and cured with the high thermal conductivity encapsulating resin, it has extremely strong waterproof and thermal conductivity.

[0042] Specifically, in some embodiments, a connector 5 is provided at one end of the connecting wire 3 away from the thermistor 2 , and the connector 5 can be well connected to an external electrical component to facilitate transmission of a temperature sampling signal.

[0043] Specifically, in some embodiments, the packaging shell 1 is an integrally molded injection molded part, which is convenient for material acquisition and processing, and is conducive to improving the production efficiency of the product.

[0044] The utility model also provides a battery pack, including a battery box and at least one battery module arranged in the battery box, and also including the above-mentioned wall-attached temperature sensor 100, wherein the battery module includes a cylindrical battery core 200, and the packaging shell 1 is attached to the side wall of the cylindrical battery core 200. By attaching the above-mentioned wall-attached temperature sensor 100 to the side wall of the cylindrical battery core 200, the temperature of the battery core can be detected to ensure stable, safe and efficient operation of the battery pack.

[0045] Specifically, in some embodiments, the packaging shell 1 is bonded to the side wall of the cylindrical battery cell 200. The packaging shell 1 is bonded to the surface of the battery cell, which is convenient to install without drilling holes in the battery cell, and will not damage the original structure of the battery cell, thereby improving the safety and stability of the battery cell.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wall-mounted temperature sensor, characterized in that: The invention comprises a packaging shell, a thermistor and a connecting wire, wherein the packaging shell has a accommodating cavity, the packaging shell is formed with an arc-shaped mounting surface suitable for adhering to the side wall of a cylindrical battery cell, the thermistor is packaged in the accommodating cavity, a heat-conducting portion is provided in an area close to the thermistor on the arc-shaped mounting surface, one end of the connecting wire is connected to the thermistor, and the other end is led out of the packaging shell.

2. The wall temperature sensor according to claim 1, characterized in that: The heat conducting part comprises a glue storage groove which is concavely arranged on the arc-shaped mounting surface, and the glue storage groove is filled with thermal conductive silicone grease.

3. The wall temperature sensor according to claim 1, characterized in that: The projection area of ​​the thermistor toward the side wall of the cylindrical battery core is located within the projection area of ​​the heat conducting portion toward the side wall of the cylindrical battery core.

4. The wall temperature sensor according to claim 1, characterized in that: The thermistor is attached to the inner wall of the accommodating cavity close to the heat conducting portion.

5. The wall temperature sensor according to claim 1, characterized in that: The packaging shell includes an arc-shaped main body having the arc-shaped mounting surface, and a mounting protrusion protruding from one end of the arc-shaped main body away from the arc-shaped mounting surface. The accommodating cavity includes a mounting cavity defined and formed on the mounting protrusion, and the thermistor is packaged in the mounting cavity.

6. The wall temperature sensor according to claim 5, characterized in that: The arc-shaped main body defines a glue storage cavity, and the glue storage cavity is connected with the installation cavity to form the accommodating cavity.

7. The wall temperature sensor according to claim 6, characterized in that: The arc-shaped main body is formed with a glue overflow hole which is communicated with the glue storage cavity.

8. The wall temperature sensor according to claim 1, characterized in that: A connector is provided at one end of the connecting wire away from the thermistor.

9. A battery pack, comprising a battery box and at least one battery module arranged in the battery box, characterized in that: It also includes a wall-attached temperature sensor as described in any one of claims 1 to 8, wherein the battery module includes a cylindrical battery cell, and the packaging shell is attached to the side wall of the cylindrical battery cell.

10. The battery pack according to claim 9, characterized in that: The packaging shell is bonded to the side wall of the cylindrical battery core.

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