CN220356414U

CN220356414U - Temperature and pressure sensor and battery pack

Info

Publication number: CN220356414U
Application number: CN202320863116.2U
Authority: CN
Inventors: 王小平; 曹万; 李凡亮; 王红明; 吴登峰; 张超军; 李兵; 施涛
Original assignee: Wuhan Finemems Inc
Current assignee: Wuhan Finemems Inc
Priority date: 2023-04-14
Filing date: 2023-04-14
Publication date: 2024-01-16
Anticipated expiration: 2033-04-14

Abstract

A temperature pressure sensor, comprising: the shell comprises a horizontal part and a vertical part formed by downward vertical extension of one end of the horizontal part; one end of the horizontal part, which is far away from the vertical part, is connected with a mechanical connecting part, and the mechanical connecting part is provided with a mounting hole; a first vertical guide part is arranged on the outer side wall of one side of the vertical part facing the horizontal part; an upper cover; a pressure measurement assembly disposed within the mounting cavity, having a pressure sensitive element; a pressure joint connected to the bottom of the horizontal portion; a plurality of lead pins on the fixed housing; and the two connecting ends of the thermosensitive element are welded with the lower ends of the connecting pins respectively, the connecting pins are fixed on the horizontal part, the upper ends of the connecting pins form fish eyes, and the fish eyes are tightly matched with second metallized connecting holes formed on the circuit board. The temperature and pressure sensor can be conveniently installed on batteries with square lithium battery packs and similar structures so as to monitor the temperature and pressure of the battery packs simultaneously.

Description

Temperature and pressure sensor and battery pack

Technical Field

The application relates to the technical field of sensors, in particular to a temperature and pressure sensor and a battery pack.

Background

The new energy automobile mainly adopts a battery as a power source, and the safety of the new energy automobile is a key factor. EVS-GTR is the first international standard of automobiles formulated by China, and meanwhile, the national standard GB38031-2020 clearly specifies that after thermal runaway of a battery monomer is required, a battery system does not fire or explode within 5 minutes, and safe escape time is reserved for passengers. In view of comprehensive detection of response speed, signal indication and maturity of vehicle gauge products, the temperature and pressure sensor is the optimal choice of the current thermal runaway sensor, and the abnormal change of the pressure value in the battery pack is monitored mainly through the absolute pressure sensor so as to realize an alarm function. In the thermal runaway process of the ternary lithium battery, the positive electrode material releases oxygen, and the oxygen and the solvent undergo oxidation reaction to generate a large amount of gas and heat. The pressure and the temperature of the battery pack rise rapidly in a short time, and the pressure and the temperature of the battery pack need to be monitored to give an alarm in advance.

The statements in this section merely provide background information related to the present application and may not constitute prior art.

Disclosure of Invention

To the not enough of prior art, this application provides a temperature pressure sensor to carry out temperature and pressure monitoring to the battery package.

In order to achieve the above purpose, the present application provides the following technical solutions: a temperature pressure sensor, comprising:

the shell comprises a horizontal part and a vertical part formed by downward vertical extension of one end of the horizontal part; the top end of the vertical part is provided with an opening; one end of the horizontal part, which is far away from the vertical part, is connected with a mechanical connecting part, and the mechanical connecting part is provided with a mounting hole; a first vertical guide part is arranged on the outer side wall of one side of the vertical part facing the horizontal part;

an upper cover which is covered on the opening and forms an installation cavity with the opening;

a pressure measurement assembly disposed within the mounting cavity and having a pressure sensitive element;

a pressure joint connected to the bottom of the horizontal part, wherein a pressure introducing channel is arranged in the pressure joint, and the other end of the pressure introducing channel is communicated with a pressure sensitive element of the pressure measuring assembly in a sealing way;

a plurality of leading-out pins on the fixed shell, one end of which is electrically connected with the pressure measuring component, and the other end of which extends into a terminal button formed at the lower end of the vertical part;

and the two connecting ends of the thermosensitive element are welded with the lower ends of the connecting pins respectively, the connecting pins are fixed on the horizontal part, the upper ends of the connecting pins form fish eyes, and the fish eyes are tightly matched with second metallized connecting holes formed on the circuit board.

Preferably, the lower edge of the connection between the horizontal part and the vertical part is shrunk upwards to form a separation groove.

Preferably, the pressure measurement assembly further comprises:

the circuit board is horizontally arranged, and the pressure sensitive element is arranged on the lower surface of the circuit board;

the upper end of the supporting frame is hermetically adhered to the circuit board;

and the annular sealing gasket is pressed at the bottom of the mounting cavity by the downward annular sealing gasket of the supporting frame.

Preferably, a plurality of riveting holes are formed in the circuit board, the horizontal portion protrudes towards the mounting cavity to form a plurality of riveting columns, and the riveting columns are riveted on the riveting holes.

Preferably, the enclosed cavity of the support frame is filled with a protective material that encapsulates the pressure die and leads.

Preferably, a plurality of first metallized connecting holes are formed in the circuit board, the first ends of the leading-out pins are upwards electrically connected to the first metallized connecting holes, and the other ends of the leading-out pins extend into the terminal buttons.

Preferably, the bottom of the mounting cavity protrudes upwards to form a circle of convex edges, and the annular sealing gasket is tightly pressed on the convex edges.

Preferably, the upper cover comprises a cover plate and a sealing flange formed by downwards protruding the outer edge of the cover plate; the periphery of the upper end of the sealing flange is sunk relatively to form a sunk surface, a second sealing groove is formed by surrounding the outer side wall of the cover plate, the sunk surface and the inner wall of the opening of the cover plate, and adhesive is filled and sealed in the second sealing groove, so that the upper cover is fixed and sealed on the opening of the horizontal part.

The application also claims a battery pack comprising:

the hard shell comprises an upper shell plate and a side shell plate, a corner is formed at the joint of the upper shell plate and the side shell plate, and a measuring hole is formed in the upper shell plate; a second vertical guide part is fixed on the outer wall of the side shell plate;

the temperature-pressure sensor according to any one of claims, the pressure connector being plugged into the measurement hole, the mechanical connection being fixedly connected to an upper housing plate; the first vertical guide part is connected with the second vertical guide part in a matched mode so as to horizontally limit the vertical part of the temperature and pressure sensor when the vertical part moves vertically relative to the side shell plate.

Preferably, the first vertical guide has a T-shaped cross section and the second vertical guide has a T-shaped slot.

The temperature and pressure sensor can be conveniently installed on batteries with square lithium battery packs and similar structures so as to monitor the temperature and pressure of the battery packs simultaneously.

Drawings

FIG. 1 is a schematic diagram showing a combination of a temperature and pressure sensor and a battery pack according to a preferred embodiment;

FIG. 2 is a bottom view of a portion of the structure of a combination of a temperature and pressure sensor and a battery pack of a preferred embodiment;

in the figure: 100. an end button; 101. a horizontal portion; 102. a standing part; 103. a mechanical connection; 104. a pressure joint; 105. protruding ridges; 106. a pressure introduction passage; 107. a first vertical guide portion; 108. a partition groove; 109. riveting a column; 1. a housing; 201. a cover plate; 202. a sealing flange; 203. sinking surface; 204. a bushing; 205. adhesive glue; 206. a support ring; 207. an outer sidewall; 208. a seal ring; 2. an upper cover; 300. a cavity; 301. a circuit board; 302. a pressure chip; 303. a lead wire; 304. a support frame; 305. a first metallized connection hole; 306. an annular gasket; 307. a protective material; 308. a second metallized connection hole; 309. a fish eye portion; 310. connecting pins; 311. a thermosensitive element; 401. a first end; 402. a second end; 4. leading out the contact pin; 900. a battery cavity; 901. an upper shell plate; 902. a side shell plate; 903. a corner; 904. a second vertical guide portion; 9. a hard shell.

Detailed Description

The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. The following examples are illustrative only and are not to be construed as limiting the present application. In the following description, the same reference numerals are used to designate the same or equivalent elements, and duplicate descriptions are omitted.

In the description of the present application, it should be understood that the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the product of the present application is conventionally put in use, or the azimuth or positional relationship as is conventionally understood by those skilled in the art, are merely for convenience of description of the present application and for simplification of description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application.

In addition, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application can be understood as appropriate by one of ordinary skill in the art.

It should be further understood that the term "and/or" as used in this specification and the corresponding claims refers to any and all possible combinations of one or more of the listed items.

As shown in fig. 1-2. The temperature and pressure sensor of the present application can be used for a battery having a hard case 9, such as a square case lithium ion battery. The temperature and pressure sensor is mounted on the upper end side of the hard case 9, i.e., outside the corner 903 where the upper plate 901 and the side plate 902 of the hard case 9 are joined. The upper housing plate 901 is provided with a measuring hole (not labeled). The temperature and pressure sensor comprises a housing 1 having a horizontal portion 101 and an upper cover 2 covering an opening provided at the top of the horizontal portion 101. The bottom of the horizontal portion 101 is connected with a pressure connector 104, and a pressure introducing channel 106 is arranged in the pressure connector 104. The pressure connector 104 is inserted into the measurement hole to measure the pressure of the battery cavity 900. A first sealing groove (not marked) is arranged on the outer wall of the pressure joint 104, and the pressure joint 104 and the measuring hole are sealed through a sealing ring 208 arranged in the first sealing groove. The horizontal portion 101 preferably has a horizontal bottom surface that is supported on the top surface of the upper housing plate 901 near the corner 903. The horizontal end of the horizontal portion 101, which is far from the corner 903, protrudes outward to form a mechanical connection portion 103, and a mounting hole is provided in the mechanical connection portion 103, and a bushing 204 is provided in the mounting hole. The bushing 204 is secured to the surface of the first end 401 by a connector between the bushing and the upper plate 901.

One end of the horizontal portion 101 near the corner 903 is connected to a vertically extending upright portion 102. The lower end of the upright 102 is connected with a terminal 100 for electrical plug-in connection. A first vertical guide portion 107 is fixed to an outer wall of one side of the end knob 100 facing the side shell plate 902, and a second vertical guide portion 904 is correspondingly fixed to an outer wall of the side shell plate 902. The first vertical guide part 107 and the second vertical guide part 904 are connected in a matching way so as to form position limitation on a horizontal plane when moving vertically relatively; for example, the first guide portion 107 may have a T-shaped cross-section, and correspondingly, the second guide portion 904 may be provided with a T-shaped groove, for example, the second guide portion 904 may be a section bar having a C-shaped cross-section, and the waist panel outer wall of the section bar may be welded to the outer wall of the side shell panel 902. In this way, the bushing 204 and the connecting piece are connected with the upper shell plate 901 so as to limit the vertical displacement of the temperature and pressure sensor during use, and the second guide part 904 and the first guide part 107 are used for limiting the lateral displacement during use, so that the installation is firm and convenient.

Wherein, the lower edge of the connection part of the horizontal part 101 and the vertical part 102 is contracted upwards to form a separation groove 108, thereby facilitating the insertion when the first guide part 107 and the second guide part 904 have larger horizontal dimension deviation.

A mounting cavity (not marked) is enclosed between the shell 1 and the upper cover 2. The mounting cavity is internally provided with a pressure measuring component which at least comprises a pressure sensitive element. The pressure measurement assembly includes a horizontally disposed circuit board 301, and a pressure sensitive element, such as a pressure chip 302 fabricated using MEMS technology, is disposed on a lower surface of the circuit board 301, and the pressure chip 302 is electrically connected to the circuit board 301 through a plurality of leads 303. The upper end of a supporting frame 304 is sealed and adhered to the lower surface of the circuit board 301, and is disposed around the pressure chip 302. The lower end of the support frame 304 presses an annular gasket 306 down against the bottom surface of the mounting cavity. The pressure introduction passage 106 communicates upward into the inner cavity of the support frame 304. The cavity 300 surrounded by the support frame 304 is filled with a protective material 307, and the protective material 307 encapsulates the pressure chip 302 and the leads 303. The protective material 307 may be a silicone gel, a fluorosilicone gel, or the like, which is capable of protecting the pressure chip 302 and the leads 303, and also capable of conducting the pressure of the pressure medium introduced by the pressure introduction passage 106 to the pressure-sensitive surface of the pressure chip 302 without damage or with low loss.

Wherein, a plurality of first metallized connection holes 305 are arranged on a side portion of the circuit board 301 near the standing portion 102. A plurality of second metallized connection holes 308 are provided on a portion of the circuit board 301 on a side thereof remote from the standing portion 102. The pressure introducing channel 106 is internally provided with a thermosensitive element 311, two connecting ends of the thermosensitive element 311 are respectively welded with the lower end of one connecting pin 310, the upper end of the connecting pin 310 is provided with a fish eye part 309, and the fish eye part 309 is upwards penetrated and tightly matched with the second metallized connecting hole 308. The housing 1 is integrally formed with a plurality of lead pins 4, and first ends 401 of the lead pins 4 extend into the mounting cavity and pass upward and are electrically connected to the first metallized connecting holes 305. The second end 402 of the lead pin 4 extends downwardly into the end knob 100. The horizontal portion 101 protrudes into the mounting cavity to form a plurality of staking posts 109, and the staking posts 109 are staked to a plurality of staking holes provided on the circuit board 301 to provide a greater sealing pressure against the annular gasket 306.

The upper cover 2 includes a cover plate 201 and a sealing flange 202 formed by downwardly projecting outer edges of the cover plate 201. The horizontal portion 101 forms a ring of support rings 206 at the opening, and the sealing flange 202 is supported on the support rings 206. The upper end periphery of the sealing flange 202 is relatively sunk to form a sunk surface 203, a second sealing groove (not marked) is enclosed among the outer side wall 207 of the cover plate 201, the sunk surface 203 and the open inner wall of the cover plate 201, and sealing adhesive 205 is encapsulated in the second sealing groove, so that the upper cover 2 is fixed and sealed on the open of the horizontal part 101.

In other embodiments, the bottom of the mounting cavity preferably protrudes upwards to form a circle of ribs 105, and the annular sealing gasket 306 is pressed on the ribs 105, so that the tightness is improved.

The scope of the present disclosure is defined not by the detailed description but by the claims and their equivalents, and all modifications within the scope of the claims and their equivalents are to be construed as being included in the present disclosure.

Claims

1. A temperature and pressure sensor, comprising:

a housing (1) including a horizontal portion (101) and a vertical portion (102) extending vertically downward from one end of the horizontal portion (101); the top end of the vertical part (102) is provided with an opening; one end of the horizontal part (101) far away from the vertical part is connected with a mechanical connecting part (103), and the mechanical connecting part (103) is provided with a mounting hole; a first vertical guide part (107) is arranged on the outer side wall of the vertical part (102) facing the horizontal part (101);

an upper cover (2) which is covered on the opening and forms an installation cavity with the opening;

a pressure joint (104) connected to the bottom of the horizontal part (101), in which a pressure introducing passage (106) is provided, the other end of the pressure introducing passage (106) being hermetically connected to a pressure sensitive element of the pressure measuring assembly;

a plurality of leading-out pins (4) on the fixed shell, one end of which is electrically connected with the pressure measuring component, and the other end of which extends into an end button (100) formed at the lower end of the vertical part (102);

and the two connecting ends of the thermosensitive element (311) are welded with the lower ends of the connecting pins (310), the connecting pins (310) are fixed on the horizontal part (101) and the upper ends of the connecting pins form a fisheye part (309), and the fisheye part (309) is tightly matched with a second metallized connecting hole (308) formed on the circuit board (301).

2. Temperature and pressure sensor according to claim 1, characterized in that the lower edge of the junction of the horizontal part (101) and the vertical part (102) is shrunk upwards to form a partition groove (108).

3. The temperature pressure sensor of claim 1, wherein the pressure measurement assembly further comprises:

the circuit board (301) is horizontally arranged, and the pressure sensitive element is arranged on the lower surface of the circuit board (301);

a supporting frame (304) surrounding the pressure sensitive element, the upper end of which is sealed and adhered to the circuit board (301);

and the annular sealing gasket (306), the downward annular sealing gasket (306) of the supporting frame (304) is pressed on the bottom of the mounting cavity.

4. A temperature and pressure sensor according to claim 3, characterized in that the circuit board (301) is provided with a plurality of riveting holes, and the horizontal part (101) protrudes towards the inside of the mounting cavity to form a plurality of riveting columns (109), and the riveting columns (109) are riveted on the riveting holes.

5. A temperature and pressure sensor according to claim 3, characterized in that the enclosed cavity (300) of the support frame (304) is filled with a protective material (307) covering the pressure chip (302) and the leads (303).

6. A temperature and pressure sensor according to claim 3, characterized in that the circuit board (301) is provided with a plurality of first metallized connection holes (305), the first ends (401) of the lead pins (4) are electrically connected to the first metallized connection holes (305) upwards, and the other ends of the lead pins (4) extend into the terminal buttons (100).

7. A temperature and pressure sensor according to claim 3, characterized in that the bottom of the mounting cavity protrudes upwards to form a ring of ridges (105), and that the annular sealing gasket (306) is pressed against the ridges (105).

8. Temperature and pressure sensor according to claim 1, characterized in that the upper cover (2) comprises a cover plate (201) and a sealing flange (202) formed by the downward projection of the outer edge of the cover plate (201); the periphery of the upper end of the sealing flange (202) is sunk relatively to form a sunk surface (203), a second sealing groove is formed by surrounding the outer side wall (207) of the cover plate (201), the sunk surface (203) and the inner wall of the opening of the cover plate (201), and adhesive glue (205) is filled in the second sealing groove in a sealing mode, so that the upper cover (2) is fixed and sealed on the opening of the horizontal part (101).

9. A battery pack, comprising:

the hard shell (9), the hard shell (9) comprises an upper shell plate (901) and a side shell plate (902), a corner (903) is formed at the joint of the upper shell plate (901) and the side shell plate (902), and a measuring hole is formed in the upper shell plate (901); a second vertical guide part (904) is fixed on the outer wall of the side shell plate (902);

the temperature-pressure sensor according to any one of claims 1 to 8, the pressure connector (104) being plugged into the measuring bore, the mechanical connection being fixedly connected to an upper housing plate (901); the first vertical guide part (107) is connected with the second vertical guide part (904) in a matching way so as to horizontally limit the vertical part (102) of the temperature and pressure sensor when vertically moving relative to the side shell plate (902).

10. The battery pack of claim 9, wherein the first vertical guide (107) has a T-shaped cross-section and the second vertical guide (904) has a T-shaped slot.