Case assembly and battery

Abstract

The present invention relates to a case assembly and a battery. The case assembly comprises a casing, wherein the casing comprises an accommodating cavity, and the accommodating cavity has an open end; a cover plate is connected to the casing and covers the open end; a negative electrode member is welded to the casing or the cover plate; a positive electrode member comprises a plate portion and a column portion, the column portion passing through the casing, and the plate portion being located inside or outside the casing; and the plate portion is in hot-melt connection with the casing by means of an insulating sheet. Further disclosed in the present invention is a battery. The present invention simplifies the battery structure and also effectively improves the sealing performance of the entire battery structure.

Description

A shell assembly and a battery

[0001] Priority information: This application claims priority to Chinese patent application No. 202421970723.X filed on August 14, 2024, Chinese patent application No. 202422136153.0 filed on September 02, 2024, Chinese patent application No. 202422712027.5 filed on November 07, 2024, Chinese patent application No. 202422717230.1 filed on November 07, 2024, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a shell assembly and a battery. BACKGROUND

[0003] With the continuous development of small portable electronic devices, battery elements that provide power for the above-mentioned devices are also more miniaturized, so small-size lithium batteries have emerged as the times require. Lithium batteries have the characteristics of high energy density, good storage performance, small self-discharge, long service life, etc. The traditional lithium battery generally has a positive pole and a negative pole on the battery shell, the positive pole is generally connected to the shell by riveting, and insulating pieces are arranged on the inner and outer sides of the shell to isolate the positive pole and the shell. This form of battery structure is complex, not convenient for assembly and processing, and there is also a gap between the insulating sheet and the positive pole, which reduces the sealing performance of the entire battery. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the defects of the prior art that the battery structure is complex and the sealing performance is not easy to guarantee.

[0005] To solve the above technical problems, the present application provides a shell assembly, comprising,

[0006] a shell, the shell comprising a receiving cavity for accommodating a battery cell, the receiving cavity having an open end;

[0007] a cover plate connected to the shell and covering the open end;

[0008] a negative piece welded to the shell or the cover plate;

[0009] a positive piece comprising a plate body portion and a column body portion, the column body portion penetrating through the shell, and the plate body portion being located inside or outside the shell;

[0010] an insulating sheet, the plate body portion being hot melt connected to the shell through the insulating sheet.

[0011] In one embodiment of the present application, the shell is provided with a mounting hole, and the insulating sheet is provided with a through hole, and the column portion passes through the through hole and the mounting hole in sequence.

[0012] In one embodiment of the present application, the thickness of the shell is 30-200 μm.

[0013] In one embodiment of the present application, the thickness of the cover plate is not greater than the thickness of the side wall.

[0014] In one embodiment of the present application, the shell is further provided with a liquid injection hole, the liquid injection hole is communicated with the accommodating cavity, the liquid injection hole is connected with a liquid plugging assembly, and the liquid plugging assembly comprises a liquid plugging main body which plugs the liquid injection hole.

[0015] In one embodiment of the present application, the liquid plugging main body is inwardly recessed in the middle portion to form a protruding portion, and the protruding portion is inserted into the liquid injection hole.

[0016] In one embodiment of the present application, the liquid plugging assembly comprises a liquid plugging main body and a first body, the first body and the liquid plugging main body are bonded by a hot melt adhesive sheet, the first body is connected with the shell, the first body is provided with a first hole body which is communicated with the liquid injection hole, and the liquid plugging main body covers the first hole body.

[0017] In one embodiment of the present application, the first body is a metal piece, the hot melt adhesive sheet is a solid body, and the first body is welded with the shell.

[0018] In one embodiment of the present application, the side wall of the shell encloses the accommodating cavity, the side wall of the shell has a first extending portion which protrudes outward, a first cavity is formed in the first extending portion, the first cavity is communicated with the accommodating cavity, the cover plate is provided with a first extending plate which covers the first cavity.

[0019] In one embodiment of the present application, the depth of the first cavity is not greater than the depth of the accommodating cavity.

[0020] In one embodiment of the present application, the liquid plugging main body is located on the first extending portion, and the positive electrode piece and the negative electrode piece are both located on the side wall of the shell; or the positive electrode piece and the negative electrode piece are both located on the first extending portion, and the liquid plugging main body is located on the side wall of the shell.

[0021] In one embodiment of the present application, the liquid plugging main body, the positive electrode piece and the negative electrode piece are all located on the first extending portion.

[0022] In an embodiment of the present application, the liquid blocking body, the positive electrode member and the negative electrode member are all located on the side wall of the shell.

[0023] In an embodiment of the present application, the side wall of the shell extends outwardly to form a second extension, the second extension has a second cavity formed inside, the second cavity is in communication with the accommodating cavity, the cover plate has a second extension plate formed thereon, the second extension plate covers the second cavity, and the first extension and the second extension extend in different directions.

[0024] In an embodiment of the present application, the liquid blocking assembly comprises a liquid blocking body and a second rubber pad, the liquid blocking body is bonded to the shell through the second rubber pad, and the liquid blocking body blocks the liquid injection hole.

[0025] In an embodiment of the present application, the second rubber pad is provided with a second through hole, the second through hole is in communication with the accommodating cavity, the second rubber pad is located between the liquid blocking body and the side wall of the shell, and the liquid blocking body covers the second through hole.

[0026] In an embodiment of the present application, the shell is internally provided with a partition plate, the partition plate divides the shell into a buffer cavity and the accommodating cavity, the partition plate is provided with a pressure relief hole, the buffer cavity and the accommodating cavity are in communication through the pressure relief hole, the shell is internally provided with an explosion-proof valve assembly, the explosion-proof valve assembly comprises a valve body and a first rubber pad, the valve body is bonded to the partition plate through the first rubber pad, and the valve body blocks the pressure relief hole.

[0027] In the present application, the contact area of the first rubber pad with the partition plate is a first contact area, the contact area of the second rubber pad with the shell is a second contact area, and the first contact area is smaller than the second contact area.

[0028] In an embodiment of the present application, the accommodating cavity is rectangular, the accommodating cavity has a first side plate portion, the first side plate portion is oppositely arranged with the partition plate, and the liquid injection hole is arranged on the first side plate portion.

[0029] In an embodiment of the present application, the first rubber pad is provided with a first through hole, the first through hole is in communication with the pressure relief hole, the first rubber pad is located between the valve body and the partition plate, and the valve body covers the first through hole.

[0030] In an embodiment of the present application, the buffer cavity is further connected with a pressure sensor.

[0031] In one embodiment of the present application, the buffer cavity is further provided with a baffle, which is located on one side of the partition plate and on the air outlet path of the pressure relief hole, the baffle and the partition plate are arranged non-parallelly, the baffle divides the buffer cavity into a first buffer chamber and a second buffer chamber, the first buffer chamber and the second buffer chamber are connected through an air passage in the buffer cavity, and the air flow in the first buffer chamber flows into the second buffer chamber through the air passage after being reflected by the baffle.

[0032] In one embodiment of the present application, the air passage and the pressure relief hole are located at two ends of the buffer cavity, respectively.

[0033] In one embodiment of the present application, a gap is formed between one end of the baffle and the inner wall of the buffer cavity to form the air passage.

[0034] In one embodiment of the present application, the shell side wall comprises a first side plate part, one end of the first side plate part is provided with a second side plate part, and the other end is provided with a third side plate part, the second side plate part and the third side plate part are arranged in parallel, the partition plate is located between the second side plate part and the third side plate part, the baffle is also located between the second side plate part and the third side plate part, the partition plate is inclined to the second side plate part by 80°-89°, and the baffle is inclined to the second side plate part by 90°-100°.

[0035] In one embodiment of the present application, the liquid injection hole is arranged on the first side plate part.

[0036] In one embodiment of the present application, the cover plate is provided with an anti-explosion groove.

[0037] The present application also discloses a battery comprising a cell and the shell assembly of any one of the above, the cell is located in the accommodating cavity, the positive electrode of the cell is electrically connected with the positive electrode part, and the negative electrode of the cell is electrically connected with the negative electrode part.

[0038] The above technical solution of the present application has the following advantages compared with the prior art:

[0039] The shell assembly and the battery of the present application make the battery structure simpler and effectively improve the sealing performance of the whole battery structure. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to make the content of the present application more easily understood, the present application will be further described in detail below according to specific embodiments of the present application and in combination with the drawings.

[0041] Fig. 1 is a schematic view of a battery structure in Embodiment One of the present application;

[0042] Fig. 2 is a plan view of the battery structure shown in Fig. 1;

[0043] Fig. 3 is a right side view of the battery structure shown in Fig. 2;

[0044] Fig. 4 is a sectional view taken at A-A in Fig. 2;

[0045] Fig. 5 is an exploded view of the battery structure shown in Fig. 1;

[0046] Fig. 6 is a structural schematic view of the liquid blocking body from one angle;

[0047] Fig. 7 is a structural schematic view of the liquid blocking body from another angle;

[0048] Fig. 8 is a structural schematic view of the battery structure shown in Fig. 1 with the cover plate and the battery cell removed;

[0049] Fig. 9 is a schematic view of the structure shown in Fig. 8 from another angle;

[0050] Fig. 10 is a schematic view of a battery structure in Embodiment 2 of the present application;

[0051] Fig. 11 is a plan view of the battery structure shown in Fig. 10;

[0052] Fig. 12 is a right side view of the battery structure shown in Fig. 11;

[0053] Fig. 13 is a sectional view taken at B-B in Fig. 11;

[0054] Fig. 14 is an exploded view of the battery structure shown in Fig. 10;

[0055] Fig. 15 is a structural schematic view of the battery structure shown in Fig. 10 with the cover plate and the battery cell removed;

[0056] Fig. 16 is a schematic view of the structure shown in Fig. 15 from another angle;

[0057] Fig. 17 is a schematic view of a battery structure in Embodiment 3 of the present application;

[0058] Fig. 18 is a schematic view of the battery structure in Fig. 17 from another angle;

[0059] Fig. 19 is an exploded view of the battery structure in Fig. 17;

[0060] Fig. 20 is an exploded view of the housing body in Fig. 17;

[0061] Fig. 21 is a front view of the battery structure in Fig. 17;

[0062] Fig. 22 is a sectional view taken at C-C in Fig. 21;

[0063] Fig. 23 is a schematic view of a battery structure in Embodiment 5 of the present application;

[0064] Fig. 24 is an exploded view of the battery structure of Fig. 23;

[0065] Fig. 25 is a structural view of the case main body of Fig. 23;

[0066] Fig. 26 is an exploded view of the case main body of Fig. 23;

[0067] Fig. 27 is a structural view of a battery structure in Embodiment 4 of the present application;

[0068] Fig. 28 is an exploded view of the battery structure of Fig. 27;

[0069] Fig. 29 is a structural view of a fourth battery structure in the present application;

[0070] Fig. 30 is a structural view of a battery structure in Embodiment 6 of the present application;

[0071] Fig. 31 is a structural view of the battery structure of Fig. 30 from another angle;

[0072] Fig. 32 is an exploded view of the battery structure of Fig. 30;

[0073] Fig. 33 is a structural view of a battery in Embodiment 7 of the present application;

[0074] Fig. 34 is an exploded view of the battery structure of Fig. 33;

[0075] Fig. 35 is a plan view of the battery structure of Fig. 33;

[0076] Fig. 36 is a sectional view of the battery structure of Fig. 35 at D-D;

[0077] Fig. 37 is a sectional view of the battery structure of Fig. 35 at E-E;

[0078] Fig. 38 is a structural view of the case of Fig. 34 from one angle;

[0079] Fig. 39 is a structural view of the case of Fig. 34 from another angle;

[0080] Fig. 40 is an exploded view of the case of Fig. 39;

[0081] Fig. 41 is a structural view of a battery in Embodiment 8 of the present application;

[0082] Fig. 42 is a structural view of the case of Fig. 41;

[0083] Fig. 43 is a structural view of a battery in Embodiment 9 of the present application;

[0084] Fig. 44 is an exploded view of the battery structure of Fig. 43;

[0085] Fig. 45 is a structural schematic diagram of the shell shown in Fig. 44;

[0086] Fig. 46 is a top view of the structure shown in Fig. 45;

[0087] Fig. 47 is an exploded view of the structure shown in Fig. 45;

[0088] Fig. 48 is a schematic diagram of the flow direction of the air after the pressure relief hole is relieved;

[0089] Fig. 49 is a structural schematic diagram of another shell of the present application;

[0090] Description of the Drawings: 10, shell; 101, side wall; 1011, first side plate portion; 1012, second side plate portion; 1013, third side plate portion; 102, accommodating cavity; 103, open end; 104, liquid injection hole; 105, mounting hole; 106, first extension portion; 1061, first chamber; 107, second extension portion; 1071, second chamber; 108, partition plate; 1081, pressure relief hole; 109, buffer cavity; 1091, baffle; 1092, first buffer chamber; 1093, second buffer chamber; 1093, air passage opening; 20, cover plate; 201, first extension plate; 202, second extension plate; 30, negative electrode member; 40, positive electrode member; 401, plate body portion; 402, column body portion; 50, insulating sheet; 501, through hole; 60, liquid blocking assembly; 601, liquid blocking main body; 6011, protruding portion; 602, first main body; 6021, channel; 603, hot melt adhesive sheet; 604, second adhesive pad; 6041, second through hole; 70, avoiding groove; 80, battery cell; 90, explosion-proof valve assembly; 901, valve body; 902, first adhesive pad; 9021, first through hole; 100, pressure sensor. DETAILED DESCRIPTION

[0091] The present application will be further described with reference to the drawings and specific examples, so that those skilled in the art can better understand the present application and implement it. It is clear that the described examples are only some of the embodiments of the present disclosure, not all. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present disclosure and its applications or uses.

[0092] In the description of the present application, it needs to be understood that the terms "vertical", "upper", "lower", "top", "side", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for descriptive purposes, 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", "second" can be explicitly or implicitly included one or more. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0093] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0094] Embodiment one

[0095] Referring to FIGS. 1-9, the present embodiment discloses a shell assembly, which comprises a shell 10, a cover plate 20, a negative electrode 30, a positive electrode 40 and an insulating sheet 50;

[0096] The shell 10 is a conductive shell and is rectangular, the shell 10 comprises a side wall 101, which encloses a receiving cavity 102 for accommodating the battery cell 70, the receiving cavity 102 has an open end 103, which is an end with an opening, and the side wall 101 is provided with a mounting hole 1011;

[0097] The cover plate 20 is connected to the shell 10 and covers the open end 103 to achieve sealed installation;

[0098] The negative electrode 30 is welded to the outer wall of the shell 10 or the cover plate 20, and the negative electrode 30 is used for electrically connecting the negative electrode of the internal battery cell 70;

[0099] The positive electrode 40 comprises a plate body part 401 and a columnar part 402, the columnar part 402 passes through the mounting hole 1011, as shown in FIGS. 8-9, the plate body part 401 is located outside the shell 10; the positive electrode 40 is used for electrically connecting the positive electrode of the internal battery cell 70;

[0100] The plate body part 401 is hot melt connected with the insulating sheet 50 and the side wall 101, that is, one side of the insulating sheet 50 is hot melt connected with the plate body part 401, and the other side is hot melt connected with the side wall 101.

[0101] The insulating sheet 50 is used to insulate the positive electrode part 40 from the shell 10, and the shell 10 and the negative electrode part 30 can be used as a whole negative electrode, and the negative electrode of the battery cell 70 can be electrically connected through the shell 10 and the negative electrode part 30.

[0102] During the hot melt connection, the insulating sheet 50 is heated to a molten viscous state, then the plate body part 401 of the positive electrode part 40 is attached to one side of the insulating sheet 50, and the side wall 101 is attached to the other side of the insulating sheet 50, and after the molten viscous state of the insulating sheet 50 is solidified and formed, the hot melt connection between the plate body part 401, the insulating sheet 50 and the side wall 101 is completed.

[0103] In the above structure, the shell 10 is rectangular, which is more conducive to part positioning and processing, and the plate body part 401 is hot melt connected with the insulating sheet 50 and the side wall 101 instead of being connected by riveting, which simplifies the battery assembly process and makes the battery structure simpler. On the other hand, the hot melt connection structure used when the plate body part 401 is connected with the insulating sheet 50 and the side wall 101 can also effectively eliminate the gap between the plate body part 401 and the insulating sheet 50 and between the insulating sheet 50 and the side wall 101, thereby effectively improving the sealing performance of the whole shell.

[0104] The insulating sheet 50 can be made of a non-metallic material, and in order to further ensure the hot melt effect, the insulating sheet 50 can be made of polypropylene material (PP plastic).

[0105] Specifically, the negative electrode part 30 can be welded on the side wall 101 or the bottom surface of the shell 10, or can be welded on the cover plate 20.

[0106] In some embodiments, as shown in FIGS. 1-4, the insulating sheet 50 is located between the plate body part 401 and the side wall 101, the insulating sheet 50 is provided with a through hole 501, and the column part 402 passes through the through hole 501 and the mounting hole 105 in sequence, so as to better ensure the connection reliability.

[0107] Further, as shown in FIG. 5, the plate body part 401 and the insulating sheet 50 are both circular, and the outer diameter of the insulating sheet 50 is greater than that of the plate body part 401, so as to better avoid the contact between the outer edge of the plate body part 401 and the shell 10 and improve the insulation effect.

[0108] It can be understood that the shapes of the plate body part 401 and the insulating sheet 50 can also be elliptical or other shapes.

[0109] In some embodiments, the cover plate 20 is provided with an explosion-proof groove (not shown in the figure), which will be broken to achieve pressure relief when the internal pressure of the shell is too large. As shown in FIG. 1 and FIG. 5, since the positive electrode 40 is mounted on the side wall 101 of the shell 10 and not on the cover plate 20, the explosion-proof groove and the positive electrode 40 are also located on different components, which is more conducive to the arrangement and processing of the explosion-proof groove.

[0110] Further, the negative electrode 30 adopts a nickel sheet, and the side wall 101 and the cover plate 20 both adopt a steel plate. At this time, the shell 10 and the cover plate 20 are both conductive components, and the two are used as a negative electrode together with the negative electrode 30; the side wall 101 adopts a steel plate, and its material is different from that of the negative electrode 30, which is more conducive to the welding of the negative electrode 30 and the side wall 101, and ensures the welding effect. Similarly, if the negative electrode 30 is welded on the steel cover plate 20, the welding effect can also be well guaranteed.

[0111] Among them, the side wall 101 and the cover plate 20 can adopt a stainless steel plate. The positive electrode 40 can adopt an aluminum material.

[0112] Preferably, the column portion 402 is located in the middle of the plate portion 401, and the plate portion 401 and the column portion 402 are both circular, and the outer diameter of the column portion 402 is smaller than that of the plate portion 401, so as to ensure the limiting effect of the plate portion 401, and also more conducive to the connection of the plate portion 401 and the insulating sheet 50.

[0113] In some embodiments, the thickness of the shell 10 is 30-200 μm, so as to ensure the structural rigidity, and also to ensure that the thickness is not too large so that the battery has sufficient capacity, and also enables the battery to be lightweight.

[0114] Further, the thickness of the cover plate 20 is not greater than the thickness of the shell 10.

[0115] Among them, the side wall 101 is also provided with a liquid injection hole 1012, which is in communication with the accommodating cavity 102, and electrolyte can be injected into the accommodating cavity 102 through the liquid injection hole 1012. The liquid injection hole 1012 is connected with a liquid plugging assembly, which includes a liquid plugging body 60.

[0116] Further, as shown in FIG. 6-FIG. 7, the liquid plugging body 60 is recessed in the middle to form a protruding portion 601, which is inserted into the liquid injection hole 1012, so as to better ensure the connection reliability and sealing performance.

[0117] Preferably, the liquid plugging body 60 can be made of stainless steel material.

[0118] In some embodiments, the accommodating cavity 102 can be provided with an open end 103 only at one end, or can be provided with an open end 103 at both ends.

[0119] The battery of the embodiment further comprises the shell assembly and the battery cell 70, the battery cell 70 is located in the accommodating cavity 102, the positive electrode of the battery cell 70 is electrically connected with the positive electrode part 40, and the negative electrode of the battery cell 70 is electrically connected with the negative electrode part 30.

[0120] If the negative electrode part 30 is connected with the shell 10, the shell 10 and the negative electrode part 30 are the whole negative electrode; if the negative electrode part 30 is connected with the conductive cover, the shell 10, the negative electrode part 30 and the cover are the whole negative electrode.

[0121] For example, the battery cell 70 generally has a positive electrode lug and a negative electrode lug, the positive electrode lug is the positive electrode of the battery cell 70, and the negative electrode lug is the negative electrode of the battery cell 70; when the battery cell 70 is connected, the positive electrode lug of the battery cell 70 can be connected with the one end of the shell 10 into which the positive electrode part 40 is deeply inserted, and the negative electrode lug of the battery cell 70 can be connected with the shell 10 or the cover.

[0122] Further, the battery cell 70 is in a rectangular shape, which is more conducive to heat dissipation, has a higher energy density, and is more conducive to stacking.

[0123] The shell assembly and the battery of the embodiment make the battery structure simpler, simplify the battery assembly process, and effectively improve the sealing performance of the whole battery structure.

[0124] Embodiment Two

[0125] Referring to FIGS. 10-16, the main difference between the embodiment and the embodiment one is that the positive electrode part 40 comprises a plate body part 401 and a column body part 402, the plate body part 401 is located inside the shell 10, at this time, the column body part 402 is partially exposed outside the shell 10 by penetrating through the mounting hole 105, and the insulating sheet 50 is also located inside the shell 10.

[0126] The shell assembly and the battery of the embodiment make the battery structure simpler, simplify the battery assembly process, and effectively improve the sealing performance of the whole battery structure.

[0127] Embodiment Three

[0128] Referring to FIGS. 17-22, the main difference between the embodiment and the embodiment one is that the shell 10 is provided with a liquid injection hole 104, the liquid injection hole 104 is connected with the accommodating cavity 102, and the liquid injection hole 104 is connected with the liquid plugging assembly 60; the liquid plugging assembly 60 comprises a liquid plugging main body 601 and a first body 602, the first body 602 and the liquid plugging main body 601 are bonded by a hot melt adhesive sheet 603; the first body 602 is connected with the shell 10, the first body 602 is provided with a first hole body connected with the liquid injection hole 104, and the liquid plugging main body 601 covers the first hole body.

[0129] As shown in FIGS. 19-20, the shell 10 side wall 101 encloses a receiving cavity 102 accommodating the battery cell 80, the receiving cavity 102 having an open end 103, and the shell 10 is further provided with a liquid injection hole 104, which is in communication with the receiving cavity 102 101, so that electrolyte can be injected into the receiving cavity 102 through the liquid injection hole 104 during battery preparation; the cover plate 20 covers the open end 103 to seal the shell 10.

[0130] The first body 602 is provided with a channel 6021 in communication with the liquid injection hole 104, and the liquid blocking body 601 covers the channel 6021, so that the liquid blocking assembly 60 can completely block the liquid injection hole 104.

[0131] In the above structure, the liquid blocking plug assembly is mainly composed of the first body 602, the hot melt sheet 603 and the liquid blocking body 601, and during preparation, the hot melt sheet 603 is in a molten state by heating, so as to bond the first body 602 and the liquid blocking body 601 together. The structure adopts a split stacking mode instead of an integrated stamping and stretching structure, which can effectively avoid the problem that the cap-shaped liquid blocking body 601 in the prior art is prone to cracking, greatly reduces the risk of liquid leakage, and improves the safety of battery use.

[0132] In some embodiments, the first body 602 and the shell 10 are welded.

[0133] Further, the first body 602 is a metal piece, the hot melt sheet 603 is a solid body, and the first body 602 and the shell 10 are welded.

[0134] The first body 602 and the liquid blocking body 601 can both be made of stainless steel sheets, the cover plate 20 and the shell 10 are also made of stainless steel sheets, and the hot melt sheet 603 can be made of polypropylene material (PP plastic).

[0135] Further, the hot melt sheet 603 is a solid sheet.

[0136] The above liquid blocking assembly 60 is first bonded together by the hot melt sheet 603 before being assembled with the shell 10, and then the first body 602 and the shell 10 are welded together.

[0137] In some embodiments, as shown in FIGS. 18-22, the shell 10 further includes a positive electrode piece 40 and a negative electrode piece 30, the positive electrode piece 40 is connected to the shell 10 through an insulating sheet 50, and the negative electrode piece 30 is welded to the shell 10.

[0138] The positive electrode piece 40 is connected to the shell 10 by hot melting, and when the shell 10 is made of conductive material, the shell 10 and the negative electrode piece are used as a whole as a negative electrode, and the positive electrode piece and the shell 10 are insulated and isolated by the insulating sheet 50.

[0139] The insulation sheet 50 can be made of a non-metal material. To further ensure the hot melting effect, the insulation sheet 50 can be made of polypropylene material (PP plastic).

[0140] The positive electrode member 40 is hot-melt connected with the shell 10 through the insulation sheet 50, which simplifies the battery assembly process and makes the battery structure simpler. On the other hand, the gap between the positive electrode member 40, the insulation sheet 50 and the shell 10 can be well maintained, thereby effectively improving the sealing performance of the entire shell 10.

[0141] The negative electrode member 30 can be made of a nickel sheet, and the positive electrode member 40 can be made of an aluminum material.

[0142] In some embodiments, the shell 10 is provided with a mounting hole 105 communicating with the accommodating cavity 102, and the positive electrode member 40 has a columnar portion 402 extending into the mounting hole 105 through the insulation sheet 50, so as to improve the connection reliability and facilitate the connection with the battery cell 80.

[0143] In some embodiments, the shell 10 can be in a rectangular shape as a whole without an extension.

[0144] In some other embodiments, as shown in FIGS. 18-20, the side wall 101 of the shell 10 has a first extension 106 protruding outwardly, and a first cavity 1061 is formed in the first extension 106. The first cavity 1061 communicates with the accommodating cavity 102, and a first extension plate 201 is formed on the cover plate 20 to cover the first cavity 1061 so as to ensure the sealing performance of the entire shell 10. The above structure is more conducive to the positioning and assembly of the external shell 10.

[0145] Further, the depth of the first cavity 1061 is not greater than the depth of the accommodating cavity 102.

[0146] As shown in FIG. 18, the liquid blocking assembly 60, the positive electrode member 40 and the negative electrode member 30 are all located on the first extension 106, which is more conducive to the positioning and assembly of the components.

[0147] In some embodiments, the side wall 101 of the shell 10 encloses a rectangular accommodating cavity 102.

[0148] The present embodiment also discloses a battery comprising the shell 10 and the battery cell 80 as described in any one of the above embodiments, wherein the battery cell 80 is located in the accommodating cavity 102.

[0149] The positive electrode of the battery cell 80 is electrically connected with the positive electrode member 40, and the negative electrode of the battery cell 80 is electrically connected with the negative electrode member 30.

[0150] Further, the battery cell 80 can be in a rectangular shape, which is more conducive to heat dissipation and has a higher energy density.

[0151] In some embodiments, the cover and the shell 10 are welded together. In order to facilitate the welding and improve the reliability of the welding, the edge of the cover can extend beyond the shell 10 by a distance L of 0.2-0.5 mm, as shown in FIG. 18.

[0152] Embodiment Four

[0153] The main difference between this embodiment and Embodiment Three is that the liquid blocking assembly 60 is located on the first extension 106, and the positive electrode 40 and the negative electrode 30 are both located on the side wall 101 of the shell 10.

[0154] Alternatively, referring to FIGS. 27-28, the positive electrode 40 and the negative electrode 30 are both located on the first extension 106, and the liquid blocking assembly 60 is located on the side wall 101 of the shell 10.

[0155] The above structure allows the positive electrode 30, the negative electrode 30, and the liquid blocking assembly 60 to be arranged on different mounting surfaces, which is more conducive to the layout and installation.

[0156] Further, the side wall 101 of the shell 10 forms a rectangular receiving cavity 102, and the first extension 106 can be located on the side wall in a certain direction of the rectangular receiving cavity 102. As shown in FIGS. 27 and 29, the liquid blocking assembly 60 can be located on the side wall in any direction, or the positive electrode 40 and the negative electrode 30 can both be located on the side wall in any direction.

[0157] Embodiment Five

[0158] Referring to FIGS. 23-26, the main difference between this embodiment and Embodiment Three is that the liquid blocking assembly 60, the positive electrode 40, and the negative electrode 30 are all located on the side wall 101 of the shell 10, and none of them is arranged on the first extension 106.

[0159] Embodiment Six

[0160] Referring to FIGS. 30-32, the main difference between this embodiment and Embodiment Three is that the shell 10 extends outward to form a second extension 107, the second extension 107 has a second cavity 1071 formed therein, the second cavity 1071 is in communication with the receiving cavity 102, the cover plate 20 has a second extension plate 202 formed thereon, the second extension plate 202 covers the second cavity 1071, and the first extension 106 and the second extension 107 extend in different directions, for example, the first extension 106 extends toward the left side, and the second extension 107 extends toward the right side.

[0161] The first extension 106 and the second extension 107 are arranged to facilitate the positioning and assembly of the shell 10, and to form a certain avoiding space to avoid relevant components, for example, the avoiding groove 70 formed between the two sides of the second extension 107 and the side wall 101, which can well play an avoiding role.

[0162] Further, the depth of the second chamber 1071 is not greater than the depth of the accommodating cavity 102.

[0163] In some embodiments, the width H1 of the first extension 106 is not greater than the width H of the shell, and the width H2 of the second extension 107 is less than the width H of the shell.

[0164] The battery structure of the above-mentioned embodiments can effectively improve the safety of the battery use and reduce the risk of liquid leakage.

[0165] Embodiment seven

[0166] Referring to FIGS. 33-37, the main difference between the present embodiment and the first embodiment is that the liquid blocking assembly 60 includes a liquid blocking main body 601 and a second rubber pad 604, the liquid blocking main body 601 is bonded to the shell 10 through the second rubber pad 604, and the liquid blocking main body 601 blocks the liquid injection hole 104.

[0167] The shell 10 is internally provided with a partition plate 108, which divides the shell 10 into a buffer cavity 109 and an accommodating cavity 102.

[0168] The partition plate 108 is provided with a pressure relief hole 1081, and the buffer cavity 109 and the accommodating cavity 102 are connected through the pressure relief hole 1081, the side wall 101 of the shell 10 is provided with a liquid injection hole 104, and the liquid injection hole 104 is connected with the accommodating cavity 102 to facilitate the injection of electrolyte into the accommodating cavity 102.

[0169] The cover plate 20 is connected to the shell 10 and covers the open end 103 to realize the sealing of the shell 10.

[0170] The shell 10 is internally provided with an explosion-proof valve assembly 90, which includes a valve body 901 and a first rubber pad 902, the valve body 901 is bonded to the partition plate 108 through the first rubber pad 902, and the valve body 901 blocks the pressure relief hole 1081.

[0171] The contact area of the first rubber pad 902 with the partition plate 108 is a first contact area, the contact area of the second rubber pad 604 with the shell 10 is a second contact area, and the first contact area is less than the second contact area.

[0172] The explosion-proof valve assembly 90 in the above structure can be opened when the pressure in the accommodating cavity 102 abnormally reaches the first pressure, so that the gas in the accommodating cavity 102 can enter the buffer cavity 1092 through the pressure relief hole 1081, thereby reducing the pressure in the accommodating cavity 102 to achieve pressure relief. If the pressure in the accommodating cavity 102 abnormally reaches the second pressure, both the explosion-proof valve assembly 90 and the liquid blocking assembly 60 are opened to achieve pressure relief, wherein the second pressure is greater than the first pressure.

[0173] Since the first contact area is smaller than the second contact area, the bonding strength of the first rubber pad 902 and the partition plate 108 is smaller than the bonding strength of the second rubber pad 604 and the shell 10. Therefore, when the pressure impact is small, the first rubber pad 902 can be separated from the partition plate 108 first, while the second rubber pad 604 still maintains a sealed bonding state with the shell 10, so that the gas in the accommodating cavity 102 enters the buffer cavity 109 through the pressure relief hole 1081 and the separation position to achieve pressure relief.

[0174] The pressure relief process of the shell assembly with the above structure is as follows:

[0175] When the battery abnormally expands the air in the accommodating cavity 102, the air pressure increases. When the air pressure increases to the first pressure, the valve body 901 at the pressure relief hole 1081 will be impacted and the first rubber pad 902 will be pulled, so that a gap is formed at the bonding position of the first rubber pad 902 and the partition plate 108. The gas in the accommodating cavity 102 enters the gap through the pressure relief hole 1081, and then enters the buffer cavity 109, so that the pressure inside the shell 10 decreases. If the pressure can return to the normal state, the liquid blocking body 601 can be removed in a specific operation space at this time, and electrolyte can be supplemented into the accommodating cavity 102 through the liquid injection hole 104. After the supplement is completed, the battery can be used normally again. It can be understood that excessive heating of the battery will cause decomposition of the electrolyte inside the shell 10 to generate a large amount of gas, causing the air inside the shell 10 to expand rapidly and the air pressure to increase. Therefore, after the air pressure returns to normal, the electrolyte needs to be added to ensure normal use of the battery.

[0176] If the gas enters the buffer cavity 109 through the pressure relief hole 1081, the air pressure will continue to increase. When the air pressure increases to the second air pressure, a gap will be formed at the bonding position of the second rubber pad 604 and the shell 10, so that part of the gas will enter the outside world through the gap. That is, at this time, in addition to the gas in the accommodating cavity 102 entering the buffer cavity 109 through the pressure relief hole 1081, a part of the gas directly enters the outside world through the liquid injection hole 104, thereby achieving pressure relief.

[0177] It should be noted that once the liquid blocking body 601 is opened, the accommodating cavity 102 will be connected to the outside world, and at this time, impurities from the outside world will also enter the shell 10, causing the battery to be contaminated and unable to be used again, and only can be treated as scrap.

[0178] The shell assembly of the above structure can only make the explosion-proof valve assembly 90 open to achieve internal pressure relief under a certain pressure (first pressure), and the pressure relief process is carried out inside the shell 10. At this time, the shell 10 is still sealed from the outside world, and the phenomenon of impurities entering the shell 10 and causing pollution will not occur. Once the pressure is relieved to the normal state, the battery can be used normally after recharging (electrolyte), so as to effectively prolong the service life of the battery.

[0179] The first rubber pad 902 and the second rubber pad 604 can be hot melt adhesive sheets. The valve body 901 and the partition plate 108 can be hot melt connected through the first rubber pad 902. The liquid blocking main body 601 and the shell 10 can be hot melt connected through the second rubber pad 604.

[0180] In some embodiments, the second rubber pad 604 is provided with a second through hole 6041, the second through hole 6041 is in communication with the accommodating cavity 102, the second rubber pad 604 is located between the liquid blocking main body 601 and the side wall 101 of the shell 10, and the liquid blocking main body 601 covers the second through hole 6041.

[0181] Further, the liquid blocking main body 601 can be in the form of a sheet.

[0182] Further, the liquid blocking main body 601 and the second rubber pad 604 are located outside the shell 10.

[0183] In some embodiments, as shown in FIG. 38, the shell 10 has an open end 103 at both ends, and each open end 103 is provided with a cover plate 20 and is covered by a corresponding cover plate 20.

[0184] The cover plate 20 and the shell 10 can be fixed by welding.

[0185] In some embodiments, the axis of the pressure relief hole 1081 is parallel to the axis of the liquid injection hole 104. In other cases, they can also form a certain angle with each other.

[0186] Preferably, as shown in FIGS. 38-39, the accommodating cavity 102 is rectangular, and the accommodating cavity 102 has a first side plate portion 1011 located on the opposite side of the partition plate 108, which is parallel to the partition plate 108. The first side plate portion 1011 is provided with a liquid injection hole 104 to facilitate processing and better ensure pressure relief.

[0187] The shell 10 can also be rectangular; the buffer cavity 109 can also be rectangular.

[0188] In order to make the shell 10 have enough space to accommodate the battery cell 80, the volume of the buffer cavity 109 can be less than the volume of the accommodating cavity 102, so as to better guarantee the battery capacity.

[0189] In some embodiments, as shown in FIG. 40, the first gasket 902 is provided with a first through hole 9021, the first through hole 9021 is in communication with the pressure relief hole 1081, the first gasket 902 is located between the valve body 901 and the partition plate 108, and the valve body 901 covers the first through hole 9021.

[0190] Further, the valve body 901 can be in a sheet shape.

[0191] Further, the valve body 901 and the first gasket 902 are both circular, and the outer diameter of the first gasket 902 is greater than the outer diameter of the valve body 901, so as to better guarantee the sealing effect.

[0192] In some embodiments, the liquid blocking body 601 and the second gasket 604 are both circular, and the outer diameter of the second gasket 604 is greater than the outer diameter of the liquid blocking body 601, so as to better guarantee the sealing effect.

[0193] The shell assembly further includes a positive electrode member 40 and a negative electrode member 30, the positive electrode member 40 is connected with the shell 10 through the insulating sheet 50, and the negative electrode member 30 is connected with the shell 10.

[0194] The shell 10 is made of conductive material, for example, can be made of stainless steel material, at this time, the shell 10 and the negative electrode member 30 as a whole play a negative electrode role.

[0195] The positive electrode member 40 can be made of aluminum, the negative electrode member 30 is made of nickel sheet, and the cover plate 20 can be made of stainless steel plate; the partition plate 108 can also be made of stainless steel plate.

[0196] The insulating sheet 50 is made of hot melt adhesive sheet, in order to further guarantee the hot melt effect, the insulating sheet 50 can be made of polypropylene material (PP plastic).

[0197] Further, the shell 10 is provided with a mounting hole 105, and one end of the positive electrode member 40 extends into the mounting hole 105 after penetrating through the insulating sheet 50.

[0198] In some embodiments, the positive electrode member 40, the negative electrode member 30 and the liquid blocking assembly 60 are arranged on the same side, so as to be more convenient for assembly.

[0199] The embodiment also discloses a battery, which includes a battery cell 80 and the shell assembly of any one of the above solutions, the battery cell 80 is arranged in the accommodating cavity 102, the accommodating cavity 102 has electrolyte, the positive electrode of the battery cell 80 is connected with the positive electrode member 40, and the negative electrode of the battery cell 80 is connected with the negative electrode member 30.

[0200] Embodiment eight

[0201] Referring to Figs. 41-42, the main difference between this embodiment and Embodiment Seven is that the pressure sensor 100 is further connected to the buffer cavity 109, which is used to monitor the pressure inside the buffer cavity 109.

[0202] When the explosion-proof valve assembly 90 is opened, the gas in the accommodation cavity 102 will enter the buffer cavity 109 through the pressure relief hole 1081, at this time the pressure of the buffer cavity 109 increases, and after the pressure sensor 100 detects the pressure change, it will send an alarm signal, so that the user can know the battery status in time and perform timely maintenance, which can avoid safety accidents or damage and pollution of other parts around the battery caused by explosion. In addition, through the pressure sensor 100, it can also monitor whether the pressure inside the shell 10 returns to the normal state after pressure relief, so as to facilitate the subsequent liquid supplementing operation.

[0203] The shell assembly and the battery of this embodiment can realize internal pressure relief under a certain pressure, and after pressure relief to the normal state, the battery can be used normally after re-liquid supplementing, thereby effectively prolonging the service life of the battery and improving the safety of the battery.

[0204] Embodiment Nine

[0205] Referring to Figs. 43-49, the main difference between this embodiment and Embodiment Seven is that the buffer cavity 109 is further provided with a baffle 1091, which is located on one side of the partition plate 108 and on the gas outlet path of the pressure relief hole 1081. The baffle 1091 and the partition plate 108 are non-parallel, so as to avoid the gas flow output through the pressure relief hole 1081 of the partition plate 108 being reflected through the baffle 1091 and directly returning to the original path without achieving the effect of reducing the gas flow intensity when they are parallel.

[0206] The baffle 1091 divides the buffer cavity 109 into a first buffer chamber 1092 and a second buffer chamber 1093, and the first buffer chamber 1092 and the second buffer chamber 1093 are connected through an airway opening 1093. The airway opening 1093 is located in the buffer cavity 109, and the gas flow flowing from the pressure relief hole 1081 into the first buffer chamber 1092 is reflected (rebounced) through the baffle 1091 and enters the second buffer chamber 1093 through the airway opening 1093.

[0207] The shell 10 is internally provided with a partition plate 108, the partition plate 108 divides the shell 10 into a buffer cavity 109 and a containing cavity 102, the partition plate 108 is provided with a pressure relief hole 1081, the buffer cavity 109 and the containing cavity 102 are communicated through the pressure relief hole 1081; the explosion-proof valve assembly 90 is located inside the shell 10, the explosion-proof valve assembly 90 includes a valve body 901 and a first rubber pad 902, the valve body 901 is bonded on the partition plate 108 through the first rubber pad 902, and the valve body 901 blocks the pressure relief hole 1081; and by further arranging a baffle 1091 in the buffer cavity 109, the buffer cavity 109 is divided into a first buffer chamber 1092 and a second buffer chamber 1093 by the baffle 1091, the following effects can be achieved:

[0208] By arranging the baffle 1091 in the buffer cavity 109, the airflow flowing to the first buffer chamber 1092 through the pressure relief hole 1081 needs to be reflected by the baffle 1091 multiple times before entering the second buffer chamber 1093 (see Fig. 48, the arrow direction in Fig. 48 is the airflow direction), and multiple reflections (rebound) will consume the energy of the airflow, causing the airflow to gradually weaken, thereby avoiding the airflow from being directly impacted on the shell 10 and the partition plate 108 after being sprayed out through the pressure relief hole 1081, thereby causing the shell to be deformed.

[0209] The pressure relief process of the shell assembly with the above structure is as follows:

[0210] When the air in the containing cavity 102 expands rapidly due to the abnormality of the battery, the air pressure increases, when the air pressure increases to a first pressure, the valve body 901 at the pressure relief hole 1081 will be impacted and pulled by the first rubber pad 902, causing a gap to appear at the bonding position of the first rubber pad 902 and the partition plate 108, so that the gas in the containing cavity 102 enters the gap through the pressure relief hole 1081, thereby entering the buffer cavity 109, thereby reducing the pressure inside the shell 10, when entering the buffer cavity 109, as shown in Fig. 49, the gas output by the pressure relief hole 1081 first enters the first buffer chamber 1092, and then enters the second buffer chamber 1093 through the air passage 1093 after being repeatedly reflected by the baffle 1091 multiple times, after the airflow enters the buffer cavity 109, if the air pressure inside the shell 10 can return to the normal state, the liquid blocking body 601 can be removed in a specific operation space at this time, and electrolyte can be supplemented into the containing cavity 102 through the liquid injection hole 104, after the supplement is completed, the battery can also be used normally again; it can be understood that the abnormal heating of the general battery will cause the air inside the shell 10 to expand rapidly and the air pressure to increase, at this time, the electrolyte inside the shell 10 will also be reduced, and the electrolyte needs to be supplemented after the air pressure returns to normal to ensure the normal use of the battery;

[0211] The shell assembly with the above structure can open the explosion-proof valve assembly 90 under a certain pressure (first pressure) to achieve internal pressure relief, thereby improving the service life and safety of the battery. In addition, the pressure relief process is carried out inside the shell, and at this time, the shell remains sealed from the outside world, and impurities from the outside world cannot enter the shell to cause pollution. Once the pressure is relieved to the normal state, the battery can be used normally after re-liquid (electrolyte) is added, thereby effectively prolonging the service life of the battery.

[0212] In some embodiments, the first adhesive pad 902 can be a hot melt adhesive sheet, and the valve body 901 and the partition plate 108 can be hot melt connected by the first adhesive sheet.

[0213] In some embodiments, as shown in FIG. 46, the air passage 1093 and the pressure relief hole 1081 are located at two ends of the buffer cavity 109, respectively, which makes the pressure relief hole 1081 and the air passage hole maintain a relatively long distance, increases the reflection times of the airflow output through the pressure relief hole 1081 between the baffle 1091 and the partition plate 108, and can better reduce the energy of the airflow.

[0214] In some embodiments, the baffle 1091 has a gap between one end of the baffle 1091 and the inner wall of the buffer cavity 109 to form the air passage 1093.

[0215] In some embodiments, the baffle 1091 has a gap between one end of the baffle 1091 and the inner wall of the buffer cavity 109 to form the air passage 1093.

[0216] In some embodiments, the shell 10 has a first side plate portion 1011, one end of the first side plate portion 1011 is provided with a second side plate portion 1012, and the other end is provided with a third side plate portion 1013, the second side plate portion 1012 and the third side plate portion 1013 are arranged in parallel, the partition plate 108 is located between the second side plate portion 1012 and the third side plate portion 1013, and the baffle 1091 is also located between the second side plate portion 1012 and the third side plate portion 1013; the partition plate 108 is inclined to the second side plate portion 1012 by 80°-89°, and the baffle 1091 is inclined to the second side plate portion 1012 by 90°-100°, so as to better increase the reflection times of the airflow between the baffle 1091 and the partition plate 108.

[0217] In some embodiments, as shown in FIG. 49, the baffle 1091 is arranged non-perpendicularly to the second side plate portion 1012, for example, the baffle 1091 is inclined to the second side plate portion 1012 by an angle β of 93°, and the partition plate 108 is inclined to the second side plate portion 1012 by an angle α of 80°-89°

[0218] Preferably, as shown in FIG. 46, the baffle 1091 is vertically arranged relative to the second side plate portion 1012, i.e. the inclination angle β of the baffle 1091 relative to the second side plate portion 1012 is 90°, and the inclination angle α of the partition plate 108 relative to the second side plate portion 1012 is 80°-89°.

[0219] Further, the first side plate portion 1011 is provided with a liquid injection hole 104.

[0220] The liquid blocking assembly 60 comprises a liquid blocking main body 601 and a second adhesive pad 604, the liquid blocking main body 601 is bonded to the side wall 101 of the shell 10 through the second adhesive pad 604, and the liquid blocking main body 601 blocks the liquid injection hole 104; wherein the contact area of the first adhesive pad 902 with the partition plate 108 is a first contact area, the contact area of the second adhesive pad 604 with the shell 10 is a second contact area, and the first contact area is smaller than the second contact area.

[0221] When the battery is abnormal and the air in the accommodation cavity 102 expands rapidly, the air pressure increases, and when the air pressure increases to a first pressure, the valve body 901 at the pressure relief hole 1081 will be impacted and the first adhesive pad 902 will be pulled, causing a gap to appear at the bonding position of the first adhesive pad 902 and the partition plate 108, so that the gas in the accommodation cavity 102 enters the above-mentioned gap through the pressure relief hole 1081, thereby entering the buffer cavity 109, so that the pressure inside the shell 10 decreases; if the gas enters the buffer cavity 109 through the pressure relief hole 1081, the air pressure continues to increase, and when it increases to a second air pressure, a gap will also appear at the bonding position of the second adhesive pad 604 and the shell 10, so that part of the gas enters the outside world through the gap, i.e. at this time, in addition to the gas in the accommodation cavity 102 entering the buffer cavity 109 through the pressure relief hole 1081, a part of the gas also directly enters the outside world through the liquid injection hole 104, thereby achieving pressure relief.

[0222] Because the first contact area is smaller than the second contact area, the bonding strength of the first adhesive pad 902 and the partition plate 108 is smaller than the bonding strength of the second adhesive pad 604 and the shell 10, so when the pressure impact is small, the first adhesive pad 902 can be separated from the partition plate 108 first, while the second adhesive pad 604 still maintains a sealed bonding state with the shell 10, so that the gas in the accommodation cavity 102 enters the buffer cavity 109 through the pressure relief hole 1081 to achieve pressure relief.

[0223] It should be noted that once the liquid blocking main body 601 is pushed open, the accommodation cavity 102 will be in communication with the outside world, at which time foreign matter in the outside world will also enter the shell 10, and the battery will be contaminated and cannot be used again, and can only be treated as scrap.

[0224] In some embodiments, as shown in FIG. 47, the second gasket 604 is provided with a second through hole 6041, the second through hole 6041 is communicated with the accommodating cavity 102, the second gasket 604 is located between the liquid blocking body 601 and the side wall 101 of the shell 10, and the liquid blocking body 601 covers the second through hole 6041.

[0225] The liquid blocking body 601 can be in a sheet shape.

[0226] In some embodiments, the liquid blocking body 601 and the second gasket 604 are both circular, and the outer diameter of the second gasket 604 is greater than that of the liquid blocking body 601, so as to better ensure the sealing effect.

[0227] In some embodiments, the first gasket 902 is provided with a first through hole 9021, the first through hole 9021 is communicated with the pressure relief hole 1081, the first gasket 902 is located between the valve body 901 and the partition plate 108, and the valve body 901 covers the first through hole 9021.

[0228] Further, the valve body 901 and the first gasket 902 are both circular, and the outer diameter of the first gasket 902 is greater than that of the valve body 901, so as to better ensure the sealing effect.

[0229] Further, the valve body 901 can be in a sheet shape.

[0230] In some embodiments, the buffer cavity 109 is further connected with a pressure sensor 100. The pressure sensor 100 is used to monitor the pressure inside the buffer cavity 109.

[0231] When the explosion-proof valve assembly 90 is pried open, the gas in the accommodating cavity 102 enters the buffer cavity 109 through the pressure relief hole 1081, at this time, the pressure of the buffer cavity 109 increases, and after the pressure sensor 100 detects the pressure change, an alarm signal is sent out, so that the user can know the battery state in time and perform timely maintenance, which can avoid safety accidents or damage and pollution of other parts around the battery caused by explosion. In addition, through the pressure sensor 100, it can also be monitored whether the pressure inside the shell 10 returns to the normal state after pressure relief, so as to facilitate the subsequent liquid supplementing operation.

[0232] In some embodiments, as shown in FIG. 44, the shell 10 is provided with an open end 103 at each end, and each open end 103 is covered by a corresponding cover plate 20.

[0233] In another way, only one open end 103 can be provided at one end of the shell 10, and the open end 103 is covered by the cover plate 20.

[0234] The cover plate 20 and the shell 10 can be fixed by welding.

[0235] The shell assembly further comprises a positive electrode member 40 and a negative electrode member 30, wherein the positive electrode member 40 is connected with the shell 10 through the insulating sheet 50, and the negative electrode member 30 is connected with the shell 10.

[0236] The shell 10 is made of conductive material, and the shell 10 and the negative electrode member 30 as a whole serve as a negative electrode.

[0237] The positive electrode member 40 can be made of aluminum, the negative electrode member 30 can be made of nickel sheet, and the cover plate 20 can be made of stainless steel plate. The baffle 108 and the blocking plate 1091 can also be made of stainless steel plate. The shell 10 can be made of stainless steel material.

[0238] The insulating sheet 50 is made of hot melt adhesive sheet. In order to further ensure the hot melt effect, the insulating sheet 50 can be made of polypropylene material (PP plastic).

[0239] In some embodiments, the positive electrode member 40, the negative electrode member 30 and the liquid blocking assembly 60 are all arranged on the first side wall 101, so as to facilitate assembly.

[0240] The embodiment further discloses a battery comprising the shell assembly of any of the above-mentioned solutions and an electric core 80, wherein the electric core 80 is arranged in the accommodating cavity 102, the accommodating cavity 102 contains electrolyte, the positive electrode of the electric core 80 is connected with the positive electrode member 40, and the negative electrode of the electric core 80 is connected with the negative electrode member 30.

[0241] The shell assembly and the battery of the embodiment can effectively release pressure, and are beneficial to prolonging the service life and improving the safety of the battery.

[0242] All the optional technical solutions can be combined to form optional embodiments of the present application, that is, any number of embodiments can be combined to meet the needs of different application scenarios, which are all within the protection scope of the present application, and will not be described one by one here.

[0243] It should be noted that the above embodiments are only examples for clearly illustrating, and are not a limitation on the embodiments. For those skilled in the art, other different forms of changes or modifications can be made on the basis of the above description. Here, all the embodiments cannot be exhaustively listed. The obvious changes or modifications derived therefrom are still within the protection scope of the present application.

Claims

1. A housing assembly characterized by: Including, The shell includes a receiving cavity accommodating the battery cell, and the receiving cavity has an open end; The cover plate is connected to the shell and covers the open end; The negative electrode member is welded to the shell or the cover plate; The positive electrode member includes a plate body and a column body, the column body passes through the shell, and the plate body is located inside or outside the shell; The plate body is hot melt connected to the shell through the insulating sheet.

2. The housing assembly of claim 1, wherein: The shell is provided with a mounting hole, the insulating sheet is provided with a through hole, and the column body passes through the through hole and the mounting hole in sequence.

3. The housing assembly of claim 1, wherein: The thickness of the shell is 30-200 μm.

4. The housing assembly of claim 1, wherein: The thickness of the cover plate is not greater than the thickness of the side wall.

5. The housing assembly of claim 1, wherein: The shell is further provided with a liquid injection hole, the liquid injection hole is communicated with the receiving cavity, the liquid injection hole is connected with a liquid blocking assembly, and the liquid blocking assembly includes a liquid blocking main body.

6. The housing assembly of claim 5, wherein: The middle part of the liquid blocking main body is inwardly recessed to form a protruding part, and the protruding part is inserted into the liquid injection hole.

7. The housing assembly of claim 5, wherein: The liquid blocking assembly includes a liquid blocking main body and a first body, the first body and the liquid blocking main body are bonded through a hot melt adhesive sheet, the first body is connected to the shell, the first body is provided with a first hole body communicated with the liquid injection hole, and the liquid blocking main body covers the first hole body.

8. The housing assembly of claim 7, wherein: The first body is a metal member, the hot melt adhesive sheet is a solid body, and the first body is welded to the shell.

9. The housing assembly of claim 7, wherein: The side wall of the shell surrounds the receiving cavity, the side wall of the shell has a first extension part protruding outward, a first cavity is formed in the first extension part, the first cavity is communicated with the receiving cavity, a first extension plate is formed on the cover plate, and the first extension plate covers the first cavity.

10. The housing assembly of claim 9, wherein: The depth of the first cavity is not greater than the depth of the receiving cavity.

11. The housing assembly of claim 9, wherein: The liquid blocking main body is located on the first extension part, and the positive electrode member and the negative electrode member are located on the side wall of the shell; or the positive electrode member and the negative electrode member are located on the first extension part, and the liquid blocking main body is located on the side wall of the shell.

12. The housing assembly of claim 9, wherein: The liquid blocking main body, the positive electrode member and the negative electrode member are located on the first extension part.

13. The housing assembly of claim 9, wherein: The liquid blocking main body, the positive electrode member and the negative electrode member are located on the side wall of the shell.

14. The housing assembly of claim 9, wherein: The side wall of the shell extends outward to form a second extension part, a second cavity is formed in the second extension part, the second cavity is communicated with the receiving cavity, a second extension plate is formed on the cover plate, the second extension plate covers the second cavity, and the extension directions of the first extension part and the second extension part are different.

15. The housing assembly of claim 5, wherein: The liquid blocking assembly includes a liquid blocking main body and a second adhesive pad, the liquid blocking main body is bonded to the shell through the second adhesive pad, and the liquid blocking main body blocks the liquid injection hole.

16. The housing assembly of claim 15, wherein: The second adhesive pad is provided with a second through hole, the second through hole is communicated with the receiving cavity, the second adhesive pad is located between the liquid blocking main body and the side wall of the shell, and the liquid blocking main body covers the second through hole.

17. The housing assembly of claim 15, wherein: The shell is internally provided with a partition plate, the partition plate separates the shell into a buffer cavity and the accommodation cavity, the partition plate is provided with a pressure relief hole, the buffer cavity and the accommodation cavity are communicated through the pressure relief hole, the shell is internally provided with an explosion-proof valve assembly, the explosion-proof valve assembly comprises a valve body and a first rubber pad, the valve body is bonded on the partition plate through the first rubber pad, and the valve body blocks the pressure relief hole. The contact area of the first rubber pad with the partition plate is a first contact area, the contact area of the second rubber pad with the shell is a second contact area, and the first contact area is smaller than the second contact area.

18. The housing assembly of claim 17, wherein: The accommodation cavity is rectangular, the accommodation cavity has a first side plate portion, the first side plate portion is oppositely arranged with the partition plate, and the liquid injection hole is arranged on the first side plate portion.

19. The housing assembly of claim 17, wherein: The first rubber pad is provided with a first through hole, the first through hole is communicated with the pressure relief hole, the first rubber pad is located between the valve body and the partition plate, and the valve body covers the first through hole.

20. The housing assembly of claim 17, wherein: The buffer cavity is further connected with a pressure sensor.

21. The housing assembly of claim 17, wherein: The buffer cavity is further provided with a baffle, the baffle is located on one side of the partition plate and on a gas outlet path of the pressure relief hole, the baffle and the partition plate are non-parallel, the baffle separates the buffer cavity into a first buffer chamber and a second buffer chamber, the first buffer chamber and the second buffer chamber are communicated through an air passage, the air passage is located in the buffer cavity, and the gas flow in the first buffer chamber flows through the baffle and enters the second buffer chamber through the air passage.

22. The housing assembly of claim 21, wherein: The air passage and the pressure relief hole are respectively located at two ends of the buffer cavity.

23. The housing assembly of claim 21, wherein: A gap is formed between one end of the baffle and the inner wall of the buffer cavity to form the air passage.

24. The housing assembly of claim 21, wherein: The shell side wall comprises a first side plate portion, one end of the first side plate portion is provided with a second side plate portion, and the other end is provided with a third side plate portion, the second side plate portion and the third side plate portion are parallel, the partition plate is located between the second side plate portion and the third side plate portion, the baffle is also located between the second side plate portion and the third side plate portion, the partition plate is inclined by 80°-89° relative to the second side plate portion, and the baffle is inclined by 90°-100° relative to the second side plate portion.

25. The housing assembly of claim 24, wherein: The liquid injection hole is arranged on the first side plate portion.

26. The enclosure assembly of claim 1, wherein: The cover plate is provided with an explosion-proof groove.

27. A battery, characterized by: The shell assembly comprises a battery cell and the shell assembly of any one of claims 1-26, the battery cell is located in the accommodation cavity, a positive electrode of the battery cell is electrically connected with the positive electrode piece, and a negative electrode of the battery cell is electrically connected with the negative electrode piece.

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