Lithium battery expansion monitoring shell

Abstract

The utility model relates to the technical field of lithium batteries, in particular to a lithium battery expansion monitoring shell which comprises a shell body, a sponge layer, a strain gauge and a lithium battery are sequentially stacked on the shell body from bottom to top, and the lithium battery expansion monitoring shell further comprises a cover body covering the shell body. According to the lithium battery expansion monitoring shell disclosed by the utility model, the strain gauge and the lithium battery are stacked, so that when the lithium battery expands, the resistance value of the strain gauge changes, and the change of the resistance value of the strain gauge can indicate whether the lithium battery expands or not; furthermore, the expansion strength of the lithium battery can be measured. And the sponge is arranged below the strain gauge, so that when the lithium battery expands, a certain deformation space is formed, and the gas pressure in the lithium battery is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and particularly relates to a lithium battery expansion monitoring shell. Background Art

[0002] Both the hard and soft shell materials of lithium batteries have a certain degree of ductility. Especially for lithium batteries with soft shells, in the early stage of thermal runaway of lithium batteries, a series of physical and chemical changes will form a pressure inside the lithium battery, making it more likely to expand.

[0003] There are already some detection devices in the prior art, such as CN207832363U - a lithium battery expansion detection device. However, the prior art is relatively complex and is mostly used in large equipment or detection equipment. Summary of the Utility Model

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a lithium battery expansion monitoring shell for detecting the expansion of lithium batteries, especially soft-pack lithium batteries, so as to solve the problems in the prior art.

[0005] To achieve the above purpose and other related purposes, the present utility model provides a lithium battery expansion monitoring shell, including a shell body. The shell body is sequentially stacked with a sponge layer, a strain gauge, and a lithium battery from its bottom to the top, and further includes a cover body covering the shell body.

[0006] In some embodiments of the present utility model, the lithium battery expansion monitoring shell further includes a first bonding part, which is arranged between the shell body and the sponge layer.

[0007] In some embodiments of the present utility model, the lithium battery expansion monitoring shell further includes a second bonding part, which is arranged between the sponge layer and the strain gauge.

[0008] In some embodiments of the present utility model, the lithium battery expansion monitoring shell further includes a third bonding part, which is arranged between the strain gauge and the lithium battery.

[0009] In some embodiments of the present utility model, the lithium battery expansion monitoring shell further includes a fourth bonding part, which is used to bond the shell body and the cover body.

[0010] In some embodiments of the present utility model, the shell body and the cover body are welded.

[0011] In some embodiments of the present utility model, the shell body and the cover body are snap-connected.

[0012] In some embodiments of the present utility model, the strain gauge includes strain gauge leads, and the lithium battery includes lithium battery leads.

[0013] In some embodiments of the present utility model, a lead transfer board is provided inside the housing, the strain gauge leads are connected to the lead transfer board, and the lithium battery leads are connected to the lead transfer board.

[0014] In some embodiments of the present utility model, output leads are further provided on the lead transfer board.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] For the lithium battery expansion monitoring housing of the present utility model, since the strain gauge and the lithium battery are stacked (for example, they can be bonded together), when the lithium battery expands, the resistance value of the strain gauge will change, and the change in the resistance value of the strain gauge can indicate whether the lithium battery expands; further, the expansion intensity of the lithium battery can be measured. Since there is sponge below the strain gauge, when the lithium battery expands, there will be a certain deformation (expansion) space, reducing the gas pressure inside the lithium battery.

[0017] The lithium battery expansion monitoring housing of the present utility model is used to detect lithium batteries, especially the expansion of soft-pack lithium batteries. It is small in size, applicable to lithium batteries of various sizes, adopts a strain gauge, has a simple solution, mature technology, low cost, and does not affect the expansion of the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It shows a schematic structural diagram of the lithium battery expansion monitoring housing (hidden cover) of the present utility model.

[0019] Figure 2 It shows a schematic cross-sectional structural diagram of the lithium battery expansion monitoring housing of the present utility model.

[0020] Figure 3 It shows a schematic front view structural diagram of the lithium battery expansion monitoring housing of the present utility model and a schematic cross-sectional structural diagram taken along line B-B.

[0021] Figure 4 It shows a schematic three-dimensional structural diagram of the lithium battery expansion monitoring housing of the present utility model.

[0022] Description of Component Labels:

[0023] 1 Housing

[0024] 2 Sponge layer

[0025] 3 Strain gauge

[0026] 31 Strain gauge leads

[0027] 4 Lithium battery

[0028] 41 Lithium battery lead

[0029] 411 Positive electrode lead of the battery

[0030] 412 Temperature sensor lead

[0031] 413 Negative electrode lead of the battery

[0032] 5 Cover

[0033] 6 Lead transfer board

[0034] 61 Output lead

[0035] 611 Positive electrode output lead of the battery

[0036] 612 Temperature sensor output lead

[0037] 613 Strain gauge output lead

[0038] 614 Negative electrode output lead of the battery Detailed implementation manners

[0039] The following further describes in detail the detailed implementation manners of the present utility model in conjunction with the accompanying drawings. These implementation manners are only used to illustrate the present utility model and are not intended to limit the present utility model.

[0040] The orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and 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, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" 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 elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0042] In addition, in the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0043] See Figures 1 to 4 , an embodiment of the present utility model provides a lithium battery expansion monitoring housing, as Figure 2 , including a housing 1, a sponge layer 2, a strain gauge 3, and a lithium battery 4 are sequentially stacked from the bottom to the top of the housing 1, as Figure 4 , and further includes a cover body 5 covering the housing 1.

[0044] In the lithium battery expansion monitoring housing provided by the embodiment of the present utility model, generally, the lengths and widths of the sponge layer 2, the strain gauge 3, and the lithium battery 4 are the same. After the cover body 5 is covered with the housing 1, the lithium battery 4 can be in contact with the cover body 5, but is not fixedly connected. The lithium battery 4 can be, for example, a soft-pack battery, and this application can detect lithium batteries 4 of different sizes.

[0045] In the lithium battery expansion monitoring housing provided by the embodiment of the present utility model, the lithium battery expansion monitoring housing further includes a first bonding portion, and the first bonding portion is disposed between the housing 1 and the sponge layer 2 for bonding the sponge layer 2 to the bottom of the housing 1. In the specific implementation manner, the first bonding portion is a double-sided adhesive tape.

[0046] In the lithium battery expansion monitoring housing provided by the embodiment of the present utility model, the lithium battery expansion monitoring housing further includes a second bonding portion, and the second bonding portion is disposed between the sponge layer 2 and the strain gauge 3, and the second bonding portion is used for bonding the sponge layer 2 and the strain gauge 3. In the specific implementation manner, the second bonding portion is a double-sided adhesive tape.

[0047] In the lithium battery expansion monitoring housing provided by the embodiment of the present utility model, the lithium battery expansion monitoring housing further includes a third bonding portion, and the third bonding portion is disposed between the strain gauge 3 and the lithium battery 4, and the third bonding portion is used for bonding the strain gauge 3 and the lithium battery 4. In the specific implementation manner, the third bonding portion is a double-sided adhesive tape.

[0048] In the lithium battery expansion monitoring housing provided by the embodiment of the present utility model, there can be various fixing methods between the housing 1 and the cover body 5.

[0049] In one implementation manner, the lithium battery expansion monitoring housing further includes a fourth bonding portion, and the fourth bonding portion is used for bonding the housing 1 and the cover body 5. In the specific implementation manner, the fourth bonding portion is a double-sided adhesive tape and / or glue. More specifically, a double-sided adhesive tape can be provided on the side of the cover body 5 facing the housing 1, and after covering, the cover body 5 and the housing 1 are fixed, or the housing 1 and the cover body 5 can be bonded with glue.

[0050] In another implementation manner, the fixing method between the housing 1 and the cover body 5 can be, for example, welding. Specifically, for example, it can be ultrasonic welding.

[0051] In yet another embodiment, the housing 1 and the cover 5 are connected by snap-fitting.

[0052] In the lithium battery expansion monitoring housing provided by the embodiment of the present utility model, a strain gauge 3 is used for expansion (deformation) detection. The strain gauge 3 can be, for example, a quarter-bridge strain gauge 3.

[0053] In the lithium battery expansion monitoring housing provided by the embodiment of the present utility model, under normal circumstances, the thickness of the sponge layer 2 is related to the lithium battery 4 used, and the thickness of the sponge layer 2 is greater than the thickness value of the normal expansion of the lithium battery 4. For example, for a soft-pack lithium battery 4 with a length of 60 mm, a width of 40 mm, and a thickness of 15 mm, the thickness value of the normal expansion thickness is 1 mm, and the thickness of the sponge layer 2 should be greater than 1 mm. The sponge layer 2 is used to prevent excessive internal pressure of the lithium battery 4.

[0054] In the lithium battery expansion monitoring housing provided by the embodiment of the present utility model, as Figure 1 , the strain gauge 3 includes strain gauge leads 31, and the lithium battery 4 includes lithium battery leads 41.

[0055] In a specific embodiment, as Figure 1 , a lead transfer board 6 is provided in the housing 1, and the lithium battery lead 41 is connected to the lead transfer board 6, and the lithium battery lead 41 is connected to the lead transfer board 6.

[0056] More specifically, as Figure 1 , an output lead 61 is further provided on the lead transfer board 6. In a specific embodiment, the lithium battery lead 41 includes three leads, a battery positive lead 411, a temperature sensor lead 412, and a battery negative lead 413. The strain gauge lead 31 includes two leads, and the output lead 61 includes four leads, namely a battery positive output lead 611, a temperature sensor output lead 612, a strain gauge output lead 613, and a battery negative output lead 614. Among them, the battery positive lead 411 is connected to the battery positive output lead 611 through the lead transfer board 6, the temperature sensor lead 412 is connected to the temperature sensor output lead 612 through the lead transfer board 6, and the battery negative lead 413 is connected to the battery negative output lead 614 through the lead transfer board 6; one of the leads of the strain gauge lead 31 is connected to the strain gauge output lead 613 through the lead transfer board 6, and the other is connected to the battery negative output lead 614 through the lead transfer board 6.

[0057] The above detection circuit is simple, with mature technology, small occupied volume, and convenient for integration.

[0058] In other implementations, the lithium battery expansion monitoring housing can also be directly designed on the product housing, and the adapter circuit board can be directly integrated on the product circuit board. The product can be, for example, a remote control, a charger, etc. The utility model is convenient for integrating various equipment with high volume requirements, requires less computing power, and is suitable for equipment that is sensitive to power.

[0059] Installation and use process of the lithium battery expansion monitoring housing provided by the embodiment of the utility model:

[0060] Installation: Place the lithium battery 4 into the shell 1, wherein the bottom of the shell 1 is bonded to the sponge layer 2 through the first bonding portion, and the sponge layer 2 is bonded to the strain gauge 3 through the second bonding portion. Place the lithium battery 4 to be installed into the shell 1, press hard, and bond the strain gauge 3 and the lithium battery 4 together through the third bonding portion; further weld the strain gauge lead 31 to the lead adapter plate 6 in the shell 1; weld the lithium battery lead 41 to the lead adapter plate 6 in the shell 1; cover the cover 5, and connect the shell 1 and the cover 5 together (they can be connected through the fourth adhesive layer, or by ultrasonic welding or snap-fitting).

[0061] Usage: The lithium battery lead 41 is directly connected to the output lead 61 through the lead adapter plate 6; the strain gauge lead 31 is connected to the battery negative electrode output lead 614 at one end through the lead adapter plate 6, and is connected to the strain gauge output lead 613 at the other end.

[0062] The lithium battery 4 installed in the housing is connected to the circuit, wherein the strain gauge output lead 613 is connected to a voltage dividing resistor to form a voltage dividing circuit, and the voltage value after voltage division is read using an analog-to-digital conversion circuit;

[0063] When using for the first time, the voltage divider value of the voltage divider circuit composed of the current strain gauge 3 should be recorded and stored;

[0064] After that, the voltage divider value of the voltage divider circuit composed of the strain gauge 3 can be monitored once every period of time, and the difference is compared with the initial recorded value. When the difference exceeds a certain threshold, an alarm is issued. (The alarm can be a temperature alarm, that is, through the temperature sensor resistance, an alarm is issued if it exceeds the threshold).

[0065] In summary, in the present invention, since the strain gauge 3 and the lithium battery 4 are stacked (for example, they can be bonded together), when the lithium battery 4 expands, the resistance value of the strain gauge 3 will change, and the change in the resistance value of the strain gauge 3 can indicate whether the lithium battery 4 expands; further, the expansion strength of the lithium battery 4 can be measured. Since the bottom of the strain gauge 3 is a sponge, when the lithium battery 4 expands, there will be a certain deformation (expansion) space, reducing the gas pressure inside the lithium battery 4.

[0066] In summary, the utility model effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0067] The above embodiments are only illustrative of the principles and effects of the utility model and are not intended to limit the utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the utility model should still be covered by the claims of the utility model.

Claims

1. A lithium battery expansion monitoring housing, characterized in that: The invention comprises a shell (1), wherein a sponge layer (2), a strain gauge (3) and a lithium battery (4) are stacked in sequence from the bottom to the top of the shell (1), and further comprises a cover (5) covering the shell (1).

2. The lithium battery expansion monitoring housing according to claim 1, characterized in that: The lithium battery expansion monitoring housing further comprises a first bonding portion, wherein the first bonding portion is arranged between the housing (1) and the sponge layer (2).

3. The lithium battery expansion monitoring housing according to claim 1, characterized in that: The lithium battery expansion monitoring housing further comprises a second bonding portion, wherein the second bonding portion is arranged between the sponge layer (2) and the strain gauge (3).

4. The lithium battery expansion monitoring housing according to claim 1, characterized in that: The lithium battery expansion monitoring housing further comprises a third bonding portion, wherein the third bonding portion is arranged between the strain gauge (3) and the lithium battery (4).

5. The lithium battery expansion monitoring housing according to claim 1, characterized in that: The lithium battery expansion monitoring housing further comprises a fourth bonding portion, wherein the fourth bonding portion is used to bond the housing (1) and the cover (5).

6. The lithium battery expansion monitoring housing according to claim 1, characterized in that: The shell body (1) and the cover body (5) are welded.

7. The lithium battery expansion monitoring housing according to claim 1, characterized in that: The shell (1) and the cover (5) are snap-connected.

8. The lithium battery expansion monitoring housing according to claim 1, characterized in that: The strain gauge (3) comprises a strain gauge lead (31), and the lithium battery (4) comprises a lithium battery lead (41).

9. The lithium battery expansion monitoring housing according to claim 8, characterized in that: A lead adapter plate (6) is provided in the housing (1), the strain gauge lead (31) is connected to the lead adapter plate (6), and the lithium battery lead (41) is connected to the lead adapter plate (6).

10. The lithium battery expansion monitoring housing according to claim 9, characterized in that: The lead adapter plate (6) is also provided with an output lead (61).

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