Shell assembly and battery

Abstract

The shell assembly comprises a shell, the shell is provided with an opening end, a partition plate is arranged in the shell and divides the shell into a buffer cavity and a containing cavity, a pressure relief hole is formed in the partition plate, the buffer cavity is communicated with the containing cavity through the pressure relief hole, a liquid injection hole is formed in the side wall of the shell, and the liquid injection hole is communicated with the containing cavity; the cover plate covers the open end; the anti-explosion valve assembly comprises a valve body and a first rubber mat, the valve body is bonded to the partition plate through the first rubber mat, and the valve body blocks the pressure relief hole; the liquid blocking assembly comprises a liquid blocking piece and a second rubber mat, the liquid blocking piece is bonded to the shell through the second rubber mat, and the liquid injection hole is blocked by the liquid blocking piece; the contact area of the first rubber mat and the partition plate is a first contact area, the contact area of the second rubber mat and the shell is a second contact area, and the first contact area is smaller than the second contact area. The utility model also discloses a battery. According to the utility model, the problem that the battery is scrapped once being subjected to pressure relief can be avoided, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a shell component and a battery. Background Art

[0002] Existing lithium-ion batteries include a shell and a cover that seals the shell. The shell is filled with electrolyte. To prevent battery abnormalities from causing explosions, an explosion-proof structure is generally provided on the cover to relieve pressure when the air pressure inside the battery is too high. Although this explosion-proof structure can relieve pressure, the battery becomes scrapped once used. In other words, the battery can no longer be used normally after the pressure is relieved, resulting in a short battery life and a waste of resources. Utility Model Content

[0003] Therefore, the technical problem to be solved by the present invention is to avoid the problem in the prior art that batteries become scrapped once the pressure is released, thereby increasing the service life of the batteries.

[0004] In order to solve the above technical problems, the present invention provides a housing assembly, comprising:

[0005] a housing having an open end, a partition disposed inside the housing, the partition dividing the housing into a buffer chamber and an accommodating chamber, a pressure relief hole disposed on the partition, the buffer chamber and the accommodating chamber being connected via the pressure relief hole, and a liquid injection hole disposed on a side wall of the housing, the liquid injection hole being connected to the accommodating chamber;

[0006] a cover plate connected to the housing and covering the open end;

[0007] an explosion-proof valve assembly, the explosion-proof valve assembly being located inside the housing and comprising a valve body and a first rubber pad, the valve body being bonded to the partition via the first rubber pad, and the valve body blocking the pressure relief hole;

[0008] a liquid blocking component, the liquid blocking component comprising a liquid blocking member and a second rubber pad, the liquid blocking member being bonded to the side wall of the housing via the second rubber pad, the liquid blocking member blocking the liquid injection hole;

[0009] The contact area between the first rubber pad and the partition is a first contact area, the contact area between the second rubber pad and the shell is a second contact area, and the first contact area is smaller than the second contact area.

[0010] In one embodiment of the present invention, the axis of the pressure relief hole and the axis of the liquid injection hole are parallel.

[0011] In one embodiment of the present invention, the accommodating cavity is rectangular and has a first side wall. The first side wall is parallel to the partition plate, and the liquid injection hole is provided on the first side wall.

[0012] In one embodiment of the present invention, a first through hole is provided on the first rubber pad, the first through hole is connected to the pressure relief hole, the first rubber pad is located between the valve body and the partition, and the valve body covers the first through hole.

[0013] In one embodiment of the present invention, the valve body and the first rubber pad are both circular, and the outer diameter of the first rubber pad is larger than the outer diameter of the valve body.

[0014] In one embodiment of the present invention, a second through hole is provided on the second rubber pad, the second through hole is communicated with the accommodating cavity, the second rubber pad is located between the liquid blocking member and the side wall of the shell, and the liquid blocking member covers the second through hole.

[0015] In one embodiment of the present invention, a pressure sensor is further connected to the buffer chamber.

[0016] In one embodiment of the present invention, both ends of the housing have open ends, and each of the open ends is covered by a corresponding cover plate.

[0017] In one embodiment of the present invention, the housing assembly further includes a positive electrode member and a negative electrode member, the positive electrode member is connected to the housing via an insulating sheet, and the negative electrode member is connected to the housing.

[0018] The utility model also discloses a battery, comprising a battery core and any one of the above-mentioned shell components, wherein the battery core is placed in the accommodating cavity.

[0019] The above technical solution of the utility model has the following advantages compared with the prior art:

[0020] The housing assembly and battery described in the present invention can achieve internal pressure relief under a certain pressure. Once the pressure is relieved to a normal state, the battery can be used normally after refilling with fluid instead of being directly scrapped, thereby effectively extending the service life of the battery and improving the safety of battery use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0022] Figure 1 It is a schematic structural diagram of a battery according to one embodiment of the present invention;

[0023] Figure 2 yes Figure 1 An exploded view of the battery structure shown;

[0024] Figure 3 yes Figure 1 A top view of the battery structure shown;

[0025] Figure 4 yes Figure 3 The cross-sectional view of the battery structure shown at AA;

[0026] Figure 5 yes Figure 3 The cross-sectional view of the battery structure shown at BB;

[0027] Figure 6 yes Figure 2 A schematic diagram of the structure of the middle shell at one angle;

[0028] Figure 7 yes Figure 2 A schematic structural diagram of the middle shell from another angle;

[0029] Figure 8 yes Figure 7 Exploded view of the middle shell;

[0030] Figure 9 It is a structural schematic diagram of a battery according to another embodiment of the present invention;

[0031] Figure 10 yes Figure 9 Schematic diagram of the structure of the middle shell;

[0032] Description of the accompanying drawings:

[0033] 10. Cover plate;

[0034] 20. Shell; 201. Open end; 202. Partition; 2021. Pressure relief hole; 203. Buffer chamber; 204. Accommodation chamber; 2041. First side wall; 205. Liquid injection hole; 206. Mounting hole;

[0035] 30. Explosion-proof valve assembly; 301. Valve body; 302. First rubber pad; 3021. First through hole;

[0036] 40. Liquid blocking assembly; 401. Liquid blocking member; 402. Second rubber pad; 4021. Second through hole;

[0037] 50. Positive electrode; 60. Insulating sheet; 70. Negative electrode; 80. Battery cell; 90. Pressure sensor. DETAILED DESCRIPTION

[0038] The present invention is further described below with reference to the accompanying drawings and specific embodiments to enable those skilled in the art to better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention. It is apparent that the embodiments described are only some of the embodiments of the present disclosure, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present disclosure, its application, or use.

[0039] In the description of the present invention, it should be understood that the terms "vertical", "upper", "lower", "top", "side", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0040] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0041] Example 1

[0042] See Figure 1-Figure 5 , this embodiment discloses a housing assembly, including a housing 20, a cover plate 10, an explosion-proof valve assembly 30 and a liquid blocking assembly 40;

[0043] The housing 20 has an open end 201 , and a partition 202 is provided inside the housing 20 . The partition 202 divides the housing 20 into a buffer chamber 203 and a receiving chamber 204 . The receiving chamber 204 is used to place the battery cell 80 .

[0044] The partition plate 202 is provided with a pressure relief hole 2021, and the buffer chamber 203 and the accommodating chamber 204 are connected through the pressure relief hole 2021. The side wall of the housing 20 is provided with a liquid injection hole 205, and the liquid injection hole 205 is connected to the accommodating chamber 204;

[0045] The cover plate 10 is connected to the housing 20 and covers the open end 201 to achieve sealing of the housing 20;

[0046] The explosion-proof valve assembly 30 is located inside the housing 20 and includes a valve body 301 and a first rubber pad 302 . The valve body 301 is bonded to the partition 202 via the first rubber pad 302 , and the valve body 301 blocks the pressure relief hole 2021 .

[0047] The liquid blocking assembly 40 includes a liquid blocking member 401 and a second rubber pad 402 . The liquid blocking member 401 is bonded to the side wall of the housing 20 via the second rubber pad 402 . The liquid blocking member 401 blocks the liquid injection hole 205 .

[0048] The contact area between the first rubber pad 302 and the partition 202 is a first contact area, and the contact area between the second rubber pad 402 and the housing 20 is a second contact area. The first contact area is smaller than the second contact area.

[0049] The explosion-proof valve assembly 30 in the above structure can be pushed open when the pressure in the accommodating chamber 204 is abnormal and reaches a first pressure, so that the gas in the accommodating chamber 204 can enter the buffer chamber 203 through the pressure relief hole 2021, thereby causing the pressure in the accommodating chamber 204 to drop and achieve pressure relief. If the pressure in the accommodating chamber 204 is abnormal and reaches a second pressure, the explosion-proof valve assembly 30 and the liquid blocking assembly 40 are both pushed open to achieve pressure relief, wherein the second pressure is greater than the first pressure.

[0050] Since the first contact area is smaller than the second contact area, the bonding strength between the first rubber pad 302 and the partition 202 is smaller than the bonding strength between the second rubber pad 402 and the shell 20. Therefore, when the pressure shock is small, the first rubber pad 302 can be detached from the partition 202 first, while the second rubber pad 402 still maintains a sealed bonding state with the shell 20, so that the gas in the accommodating chamber 204 enters the buffer chamber 203 through the pressure relief hole 2021 and the detachment point to achieve pressure relief.

[0051] The pressure relief process of the housing assembly of the above structure is as follows:

[0052] When the battery is abnormal, the air in the accommodating chamber 204 expands rapidly and the air pressure increases. When the air pressure increases to the first pressure, it will impact the valve body at the pressure relief hole 2021 and pull the first rubber pad 302, so that a gap will appear at the bonding point between the first rubber pad 302 and the partition 202, so that the gas in the accommodating chamber 204 enters the above-mentioned gap through the pressure relief hole 2021 and then enters the buffer chamber 203, thereby reducing the pressure inside the shell 20. If the pressure can be restored to normal, the liquid blocking member 401 can be removed in the specific operating space at this time, and the electrolyte can be replenished into the accommodating chamber 204 through the liquid injection hole 205. After replenishment, the battery can be used normally again. It is understandable that excessive heating of the battery will cause the electrolyte inside the shell 20 to decompose and produce a large amount of gas, causing the air inside the shell to expand rapidly and the air pressure to increase. Therefore, after the air pressure returns to normal, electrolyte needs to be replenished to ensure normal use of the battery.

[0053] If the gas enters the buffer chamber 203 through the pressure relief hole 2021 and the air pressure continues to increase, when it increases to the second air pressure, a gap will appear at the bonding point between the second rubber pad 402 and the shell 20, so that part of the gas will enter the outside through the gap. That is, at this time, in addition to entering the buffer chamber 203 through the pressure relief hole 2021, a part of the gas in the accommodating chamber 204 also directly enters the outside through the liquid injection hole 205, thereby achieving pressure relief.

[0054] It should be noted that once the liquid blocking member 401 is pushed open, the accommodating chamber 204 will be connected to the outside world. At this time, external impurities will also enter the shell 20, and the battery will be contaminated and can no longer be used and can only be scrapped.

[0055] The shell assembly of the above structure can realize internal pressure relief by opening only the explosion-proof valve assembly 30 under a certain pressure (first pressure). The pressure relief process is carried out inside the shell 20. At this time, the shell 20 and the outside world remain sealed, and no external impurities enter the shell 20 and cause contamination. Once the pressure is relieved to a normal state and the battery is refilled with fluid (electrolyte), it can still be used normally without being directly scrapped, thereby effectively extending the service life of the battery.

[0056] The first rubber pad 302 and the second rubber pad 402 can both be hot melt rubber sheets. The valve body 301 and the partition 202 can be hot melt connected by the first rubber pad 302; the liquid blocking member 401 and the shell 20 can be hot melt connected by the second rubber pad 402.

[0057] In some embodiments, as Figure 6 As shown, both ends of the housing 20 have open ends 201 , and each open end 201 is provided with a cover plate 10 and is covered by a corresponding cover plate.

[0058] The cover plate 10 and the housing 20 may be fixed by welding.

[0059] In some embodiments, the axis of the pressure relief hole 2021 is parallel to the axis of the liquid injection hole 205 .

[0060] Preferably, Figure 6-Figure 7 As shown, the accommodating chamber 204 is rectangular and has a first side wall 2041 . The first side wall 2041 is parallel to the partition 202 . A liquid injection hole 205 is provided on the first side wall 2041 to facilitate processing and better ensure pressure relief effect.

[0061] The housing 20 may also be rectangular; the buffer cavity 203 may also be rectangular.

[0062] In order to ensure that there is enough space inside the housing 20 to accommodate the battery cell 80, the volume of the buffer cavity 203 can be made smaller than the volume of the accommodating cavity 204, which can also better ensure the battery capacity.

[0063] In some embodiments, as Figure 8 As shown, a first through hole 3021 is provided on the first rubber pad 302 , the first through hole 3021 is connected to the pressure relief hole 2021 , the first rubber pad 302 is located between the valve body 301 and the partition 202 , and the valve body 301 covers the first through hole 3021 .

[0064] Furthermore, the valve body may be in a sheet shape.

[0065] Furthermore, the valve body 301 and the first rubber pad 302 are both circular, and the outer diameter of the first rubber pad 302 is larger than the outer diameter of the valve body to better ensure the sealing effect.

[0066] In some embodiments, a second through hole 4021 is provided on the second rubber pad 402, the second through hole 4021 is connected to the accommodating cavity 204, the second rubber pad 402 is located between the liquid blocking member 401 and the side wall of the shell 20, and the liquid blocking member 401 covers the second through hole.

[0067] Furthermore, the liquid blocking member 401 may be in the form of a sheet.

[0068] Furthermore, the liquid blocking member 401 and the second rubber pad 402 are both located outside the housing 20 .

[0069] In some embodiments, the liquid blocking member 401 and the second rubber pad 402 are both circular, and the outer diameter of the second rubber pad 402 is larger than the outer diameter of the liquid blocking member 401 to better ensure a sealing effect.

[0070] The housing assembly further includes a positive electrode member 50 and a negative electrode member 70 . The positive electrode member 50 is connected to the housing 20 via an insulating sheet 60 , and the negative electrode member 70 is connected to the housing 20 .

[0071] The housing 20 is made of a conductive material, such as stainless steel. In this case, the housing 20 and the negative electrode member 70 function as a negative electrode as a whole.

[0072] The positive electrode member 50 can be made of aluminum, the negative electrode member 70 can be made of nickel, the cover plate 10 can be made of stainless steel, and the separator 202 can also be made of stainless steel.

[0073] The insulating sheet 60 may be a hot melt adhesive sheet.

[0074] Furthermore, a mounting hole 206 is provided on the housing 20 , and one end of the positive electrode member 50 passes through the insulating sheet 60 and extends into the mounting hole 206 .

[0075] In some embodiments, the positive electrode member 50 , the negative electrode member 70 and the liquid blocking assembly 40 are arranged on the same side to facilitate assembly.

[0076] This embodiment also discloses a battery, including a battery cell 80 and a shell assembly of any of the above-mentioned schemes, the battery cell 80 is placed in the accommodating cavity 204, the accommodating cavity 204 contains electrolyte, the positive electrode of the battery cell 80 is connected to the positive electrode member 50, and the negative electrode of the battery cell 80 is connected to the negative electrode member 70.

[0077] Example 2

[0078] See Figure 9-10 The main difference between this embodiment and the first embodiment is that a pressure sensor 90 is further connected to the buffer cavity 203 , and the pressure sensor 90 is used to monitor the pressure inside the buffer cavity 203 .

[0079] When the explosion-proof valve assembly 30 is pushed open, the gas in the accommodating chamber 204 enters the buffer chamber 203 through the pressure relief hole 2021. At this time, the pressure in the buffer chamber 203 increases. Upon detecting the pressure change, the pressure sensor 90 issues an alarm signal, allowing the user to promptly monitor the battery status and perform repairs. This prevents explosions from causing safety accidents or damaging or contaminating other parts surrounding the battery. Furthermore, the pressure sensor 90 can also monitor whether the internal pressure of the battery case has returned to normal after pressure relief, facilitating subsequent rehydration operations.

[0080] The housing components and batteries of the above-mentioned embodiments can achieve internal pressure relief under a certain pressure. Once the pressure is relieved to a normal state, the battery can be refilled with fluid and can still be used normally without being directly scrapped, thereby effectively extending the service life of the battery and improving the safety of the battery.

[0081] All of the above optional technical solutions can be combined in any way to form optional embodiments of the present invention, that is, any multiple embodiments can be combined to meet the needs of different application scenarios. They are all within the scope of protection of this application and will not be described in detail here.

[0082] It should be noted that the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A housing assembly, characterized in that: include, a housing having an open end, a partition disposed inside the housing, the partition dividing the housing into a buffer chamber and an accommodating chamber, a pressure relief hole disposed on the partition, the buffer chamber and the accommodating chamber being connected via the pressure relief hole, and a liquid injection hole disposed on a side wall of the housing, the liquid injection hole being connected to the accommodating chamber; a cover plate connected to the housing and covering the open end; an explosion-proof valve assembly, the explosion-proof valve assembly being located inside the housing and comprising a valve body and a first rubber pad, the valve body being bonded to the partition via the first rubber pad, and the valve body blocking the pressure relief hole; a liquid blocking component, the liquid blocking component comprising a liquid blocking member and a second rubber pad, the liquid blocking member being bonded to the side wall of the housing via the second rubber pad, the liquid blocking member blocking the liquid injection hole; The contact area between the first rubber pad and the partition is a first contact area, the contact area between the second rubber pad and the shell is a second contact area, and the first contact area is smaller than the second contact area.

2. The housing assembly according to claim 1, wherein: The axis of the pressure relief hole is parallel to the axis of the liquid injection hole.

3. The housing assembly according to claim 1, wherein: The accommodating cavity is rectangular and has a first side wall. The first side wall is parallel to the partition plate, and the liquid injection hole is provided on the first side wall.

4. The housing assembly according to claim 1, wherein: The first rubber pad is provided with a first through hole, which is communicated with the pressure relief hole. The first rubber pad is located between the valve body and the partition, and the valve body covers the first through hole.

5. The housing assembly according to claim 4, wherein: The valve body and the first rubber pad are both circular, and the outer diameter of the first rubber pad is larger than the outer diameter of the valve body.

6. The housing assembly according to claim 1, wherein: A second through hole is provided on the second rubber pad, the second through hole is communicated with the accommodating cavity, the second rubber pad is located between the liquid blocking member and the side wall of the shell, and the liquid blocking member covers the second through hole.

7. The housing assembly according to claim 1, wherein: The buffer cavity is also connected to a pressure sensor.

8. The housing assembly according to claim 1, wherein: Both ends of the shell have open ends, and each of the open ends is covered by a corresponding cover plate.

9. The housing assembly according to claim 1, wherein: It also includes a positive electrode and a negative electrode. The positive electrode is connected to the shell through an insulating sheet, and the negative electrode is connected to the shell.

10. A battery, characterized in that: It comprises a battery core and the housing assembly according to any one of claims 1 to 9, wherein the battery core is placed in the accommodating cavity.

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