Battery structure and battery

Abstract

In order to solve the problem that the whole battery is on fire due to the fact that an existing single battery cell is on fire, the utility model provides a battery structure and a battery, the battery structure comprises a fixing support, a plurality of mica barrels and a plurality of battery cells, the mica barrels are sleeved on the peripheries of the battery cells in a one-to-one correspondence mode, and the mica barrels and the battery cells are fixed on the fixing support. The adjacent mica barrels are isolated by a fixing bracket; according to the utility model, the mica barrels are arranged on the outer sides of the battery cells, the mica barrels are positioned between the battery cells and the fixed bracket, the mica barrels have the functions of heat insulation and burning resistance, and the mica barrels are sleeved outside each battery cell, so that one battery cell can be isolated by the mica barrels and the fixed bracket when catching fire due to thermal runaway; the two adjacent mica barrels are also isolated by the fixing bracket, so that the air conduction heat and the heat conductivity are very small, the heat transfer influence between the two adjacent battery cells is very small, and the phenomenon that other battery cells are on fire due to thermal runaway cannot be influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery fire prevention, in particular to a battery structure and a battery. Background Art

[0002] As more and more portable wireless products are used, more and more batteries are used. Consumers are paying more and more attention to battery safety. For example, sometimes batteries catch fire during charging, or batteries catch fire due to being hit or squeezed. The entire battery quickly burns, causing the entire product to burn. Therefore, how to overcome the above-mentioned technical problems and defects has become a key issue that needs to be resolved. Utility Model Content

[0003] Aiming at the problem that the fire of a single battery may cause the fire of the entire battery, the utility model provides a battery structure and a battery.

[0004] The technical solution adopted by the utility model to solve the above technical problems is as follows:

[0005] On the one hand, the utility model provides a battery structure, including a fixed bracket, a plurality of mica barrels and a plurality of battery cells, wherein the plurality of mica barrels are sleeved on the outer circumference of the plurality of battery cells in a one-to-one correspondence, the plurality of mica barrels and the plurality of battery cells are fixed on the fixed bracket, and adjacent mica barrels are isolated by the fixed bracket.

[0006] Optionally, the fixed bracket includes a first bracket and a second bracket, one end of the first bracket is provided with at least one first limiting groove, one end of the second bracket is provided with a second limiting groove at a position corresponding to the first limiting groove, the two ends of the battery cell are respectively located in the first limiting groove and the second limiting groove, and the two ends of the mica barrel are respectively abutted against the ends of the first limiting groove and the second limiting groove.

[0007] Optionally, a first extending piece is disposed on the outer periphery of the end of the first limiting groove, and a second extending piece is disposed on the outer periphery of the end of the second limiting groove, and the first extending piece is connected to the second extending piece via a clamping structure.

[0008] Optionally, a groove portion is provided at the other end of the first bracket, a first nickel sheet is provided in the groove portion, multiple ends of the first nickel sheet close to the surface of the battery cell are respectively used to connect with one end of the multiple battery cells, and a surface of the first nickel sheet away from the battery cell is connected to a PCM board.

[0009] Optionally, the first nickel sheet includes a first welding sheet, a first connecting sheet and a second welding sheet, two first welding sheets are provided, both ends of the first connecting sheet are respectively connected to the first welding sheet, a surface of each of the first welding sheets is provided with a plurality of first welding points, the first welding points are used to be welded to the poles of the battery cell, one side of the connecting sheet is connected to the second welding sheet, the extension directions of the second welding sheet and the first welding point are opposite, a slot is provided on the PCM board, the second welding sheet passes through the slot to be connected to an external circuit, and the other surfaces of the plurality of first welding sheets are welded to the PCM board.

[0010] Optionally, a second nickel sheet is provided at the other end of the second bracket, the second nickel sheet includes a third welding sheet, a second connecting sheet and a fourth welding sheet, four third welding sheets are provided, the second connecting sheet is provided in an I-shape, the four corners of the second connecting sheet are provided with the first welding sheets, a surface of each of the first welding sheets is provided with a plurality of second welding points, the second welding points are provided on a side close to the battery cell for welding to the pole of the battery cell, the second welding sheet is connected to one side of the first welding sheet, the second welding sheet and the second welding point have the same extension direction, and the second welding sheet is used to be connected to an external circuit.

[0011] Optionally, a fuse is provided in the middle of the first nickel sheet and / or the second nickel sheet.

[0012] Optionally, the snap-fit ​​structure includes a buckle and a slot, and the first extension piece and the second extension piece are each independently selected from one of the buckle and the slot.

[0013] Optionally, a first bone fixing piece is disposed on the side wall of the first limiting groove, and a second bone fixing piece is disposed on the side wall of the second limiting groove, and both the first bone fixing piece and the second bone fixing piece are used to fix the battery core.

[0014] Another aspect of the utility model provides a battery, and the battery includes the battery structure described above.

[0015] According to the battery structure provided by the utility model, a mica barrel is arranged on the outer side of the battery cell, and the mica barrel is located between the battery cell and the fixed bracket. The mica barrel has the functions of heat insulation and fire resistance. A mica barrel is sheathed on the outside of each battery cell. When a battery cell has thermal runaway and catches fire, it will be isolated by the mica barrel and the fixed bracket. Since the mica barrel is sheathed on the outside of the battery cell, and two adjacent mica barrels are also isolated by the fixed bracket, the heat conducted by the air and the thermal conductivity are very small, so the heat transfer effect between two adjacent battery cells is very small, and will not affect the phenomenon of thermal runaway and fire in other battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a battery structure provided by an embodiment of the utility model;

[0017] Figure 2 This is an exploded schematic diagram of a battery structure provided by an embodiment of the utility model;

[0018] Figure 3 It is a cross-sectional schematic diagram of a battery structure provided by an embodiment of the utility model;

[0019] Figure 4 It is a top view schematic diagram of a first bracket in a battery structure provided by an embodiment of the utility model;

[0020] Figure 5 It is a bottom view schematic diagram of a first bracket in a battery structure provided by an embodiment of the utility model;

[0021] Figure 6 It is a bottom view schematic diagram of a second bracket in a battery structure provided by an embodiment of the utility model;

[0022] Figure 7 It is a top view schematic diagram of a second bracket in a battery structure provided by an embodiment of the utility model;

[0023] Figure 8 It is a structural schematic diagram of a first nickel sheet in a battery structure provided by an embodiment of the utility model;

[0024] Fig. 9 It is a cross-sectional schematic diagram of a second nickel sheet in a battery structure provided by an embodiment of the utility model;

[0025] The reference numerals in the drawings of the specification are as follows:

[0026] 1-fixed bracket; 11-first bracket; 111-first limiting groove; 112-first extension piece; 113-groove portion; 114-slot; 115-first bone position fixing piece; 12-second bracket; 121-second limiting groove; 122-second extension piece; 123-buckle; 124-second bone position fixing piece; 21-first nickel sheet; 211-first welding sheet; 212-first connecting sheet; 213-second welding sheet; 214-first welding point; 22-second nickel sheet; 221-third welding sheet; 222-second connecting sheet; 223-fourth welding sheet; 224-second welding point; 23-fuse; 3-mica barrel; 4-battery cell; 5-PCM board; 51-slot hole. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0028] In the description of the present invention, it should be understood that the terms "side", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figure 1-3 As shown, in one embodiment, the utility model provides a battery structure, including a fixed bracket 1, a plurality of mica barrels 3 and a plurality of battery cells 4, the plurality of mica barrels 3 are arranged one by one on the outer circumference of the plurality of battery cells 4, the plurality of mica barrels 3 and the plurality of battery cells 4 are fixed on the fixed bracket 1, and adjacent mica barrels 3 are isolated by the fixed bracket 1.

[0031] Specifically, the number of the battery cells 4 is at least 2. In a preferred embodiment, the number of the battery cells 4 is 4.

[0032] The number of mica barrels 3 is at least 2. In a preferred embodiment, the number of mica barrels 3 is 4.

[0033] A mica barrel 3 is provided on the outside of the battery cell 4 of the present application, and the mica barrel 3 is located between the battery cell 4 and the fixed bracket 1. The mica barrel 3 has the functions of heat insulation and fire resistance. A mica barrel 3 is provided on the outside of each battery cell 4. When a battery cell 4 has a thermal runaway and catches fire, it will be isolated by the mica barrel 3 and the fixed bracket 1. Since the mica barrel 3 is provided on the outside of the battery cell 4, and the two adjacent mica barrels 3 are also isolated by the fixed bracket 1, the air conduction heat and thermal conductivity are very small, so the heat transfer effect between two adjacent battery cells 4 is very small, and will not affect the thermal runaway and fire of other battery cells 4.

[0034] like Figure 1-3 As shown, in one embodiment, the fixed bracket 1 includes a first bracket 11 and a second bracket 12, one end of the first bracket 11 is provided with at least one first limiting groove 111, one end of the second bracket 12 is provided with a second limiting groove 121 at a position corresponding to the first limiting groove 111, both ends of the battery cell 4 are respectively located in the first limiting groove 111 and the second limiting groove 121, and the two ends of the mica barrel 3 are respectively abutted against the ends of the first limiting groove 111 and the second limiting groove 121.

[0035] Specifically, the first bracket 11 and the second bracket 12 are both made of insulating materials; the number of the first limiting grooves 111 is at least 2, and in a preferred embodiment, the number of the first limiting grooves 111 is 4.

[0036] Similarly, the number of the second limiting grooves 121 is at least 2. In a preferred embodiment, the number of the second limiting grooves 121 is 4. The first limiting groove 111 and the second limiting groove 121 are arranged opposite to each other.

[0037] By arranging a mica barrel 3 on the outside of the battery cell 4, the mica barrel 3 is located between the battery cell 4, the first bracket 11 and the second bracket 12, the mica barrel 3 has the functions of heat insulation and fire resistance, and each battery cell 4 is sheathed with a mica barrel 3 on the outside. When a battery cell 4 has thermal runaway and catches fire, it will be isolated by the mica barrel 3, the first bracket 11 and the second bracket 12. Since the mica barrel 3 is sheathed on the outside of the battery cell 4, the two adjacent mica barrels 3 are also isolated by the first bracket 11 and the second bracket 12. Therefore, the air conduction heat and thermal conductivity are very small, so the heat transfer effect between two adjacent battery cells 4 is very small, and will not affect the thermal runaway and fire of other battery cells 4.

[0038] like Figure 1-3 As shown, in one embodiment, a first extending piece 112 is disposed on the periphery of the end of the first limiting groove 111, and a second extending piece 122 is disposed on the periphery of the end of the second limiting groove 121. The first extending piece 112 and the second extending piece 122 are connected via a snap-fit ​​structure.

[0039] Specifically, the minimum distance between two adjacent first extension members 112 is 1 mm-3 mm, and the minimum distance between two adjacent second extension members 122 is 1 mm-3 mm.

[0040] Specifically, a mica barrel 3 is provided on the outside of each battery cell 4 for isolation, and a first extension piece 112 and a second extension piece 122 are provided on the outside of the mica barrel 3. Two adjacent first extension pieces 112 do not touch each other, and two adjacent second extension pieces 122 do not touch each other, so that there is an air isolation gap of about 3 mm between the two mica barrels 3. Within this distance range, the heat conduction and thermal conductivity of the air are very small, so that the heat transfer effect between two adjacent battery cells 4 is very small, and it is difficult to cause thermal runaway and fire of the adjacent battery cells 4.

[0041] like Figure 1-5 As shown, in one embodiment, a groove portion 113 is provided at the other end of the first bracket 11, and a first nickel sheet 21 is provided in the groove portion 113. Multiple ends of the first nickel sheet 21 close to the surface of the battery cell 4 are respectively used to connect with one end of multiple battery cells 4, and the surface of the first nickel sheet 21 away from the battery cell 4 is connected to the PCM board 5.

[0042] like Figure 8 As shown, in one embodiment, the first nickel sheet 21 includes a first welding sheet 211, a first connecting sheet 212 and a second welding sheet 213. Two first welding sheets 211 are provided, and both ends of the first connecting sheet 212 are respectively connected to the first welding sheet 211. A surface of each first welding sheet 211 is provided with a plurality of first welding points 214, and the first welding point 214 is used for welding with the pole of the battery cell 4. A second welding sheet 213 is connected to one side of the first connecting sheet 212, and the extension directions of the second welding sheet 213 and the first welding point 214 are opposite. A slot 51 is provided on the PCM board 5, and the second welding sheet 213 passes through the slot 51 to be connected to the external circuit, and the other surfaces of the plurality of first welding sheets 211 are all welded to the PCM board 5.

[0043] Specifically, the first welding plate 211 is circular, and 2-8 first welding points 214 are arranged on the first welding plate 211. In a preferred embodiment, 4 first welding points 214 are arranged on the first welding plate 211, and the 4 first welding points 214 are arranged at equal angles around the center of the first welding plate 211.

[0044] like Fig. 9As shown, in one embodiment, a second nickel sheet 22 is provided at the other end of the second bracket 12, and the second nickel sheet 22 includes a third welding sheet 221, a second connecting sheet 222 and a fourth welding sheet 223. Four third welding sheets 221 are provided, and the second connecting sheet 222 is arranged in an I-shape. The four corners of the second connecting sheet 222 are provided with third welding sheets 221, and a surface of each third welding sheet 221 is provided with multiple second welding points 224. The second welding point 224 is arranged on a side close to the battery cell 4 for welding with the pole of the battery cell 4. A fourth welding sheet 223 is connected to one side of the third welding sheet 221, and the fourth welding sheet 223 and the second welding point 224 have the same extension direction. The fourth welding sheet 223 is used to connect to an external circuit.

[0045] like Figure 8-9 As shown, in one embodiment, a fuse 23 is provided in the middle of the first nickel sheet 21 and / or the second nickel sheet 22 .

[0046] Specifically, the fuse 23 is dug in the middle of at least one side of the first connecting piece 212 and / or the second connecting piece 222, so that the width of the fuse 23 is smaller than the width of the first connecting piece 212 and / or the second connecting piece 222. The present application sets a nickel sheet structure of the fuse 23 on the first nickel sheet 21 or the second nickel sheet 22 between two adjacent battery cells 4 connected in parallel. When one of the battery cells 4 thermally runs away and catches fire, the parallel battery cells 4 are short-circuited at the same time. By setting a nickel sheet structure of the fuse 23 on the first nickel sheet 21 or the second nickel sheet 22 of the two battery cells 4 in parallel, when one battery cell 4 thermally runs away and catches fire, the first nickel sheet 21 or the second nickel sheet 22 is melted, and the other battery cell 4 will not be affected, so that the battery cell 4 will not short-circuit and catch fire, thereby protecting the battery cell 4 and protecting the safety of the user.

[0047] like Figure 4-7 As shown, in one embodiment, the snap-fit ​​structure includes a snap buckle 123 and a snap slot 114 , and the first extension member 112 and the second extension member 122 are each independently selected from one of the snap buckle 123 and the snap slot 114 .

[0048] Specifically, at least one slot 114 is provided at the end of each first extension member 112, and a buckle 123 is provided at the position of the slot 114 at the end of each second extension member 122, and the buckle 123 is connected to the slot 114, so as to fix the first extension member 112 and the second extension member 122 together, connect the first bracket 11 and the second bracket 12 as a whole, and then fix the battery cell 4 and the mica barrel 3 between the first bracket 11 and the second bracket 12.

[0049] like Figure 1-7As shown, in one embodiment, the side wall of the first limiting groove 111 is provided with a first bone fixing member 115, and the side wall of the second limiting groove 121 is provided with a second bone fixing member 124, and the first bone fixing member 115 and the second bone fixing member 124 are both used to fix the battery cell 4.

[0050] A first frame fixing piece 115 is added to the side wall of the first limiting groove 111 to fix the battery cell 4, which can prevent the tolerance of the battery cell 4 from affecting the tightness of the battery cell 4 and maintain a gap between the battery cell 4 and the bracket, thereby ensuring that the plastic bracket slows down the transfer of heat when it catches fire or is heated.

[0051] A second frame fixing piece 124 is added to the side wall of the second limiting groove 121 to fix the battery cell 4, which can prevent the tolerance of the battery cell 4 from affecting the tightness of the battery cell 4 and maintain a gap between the battery cell 4 and the bracket, thereby ensuring that the plastic bracket slows down the transfer of heat when it catches fire or is heated.

[0052] The installation process of the present application is as follows: first, multiple battery cells 4 are respectively loaded into the second bracket 12, and then the mica barrel 3 is assembled into the second bracket 12. When the mica barrel 3 is loaded into the second bracket 12, each battery cell 4 is simultaneously inserted into the corresponding mica barrel 3, and then the first bracket 11 and the second bracket 12 are fixed together through a clamping structure. The first ends of the battery cells 4 are spot welded in series or in parallel using the first nickel sheet 21, the first nickel sheet 21 is welded to the PCM, and the second ends of the battery cells 4 are spot welded in series or in parallel using the second nickel sheet 22, thereby forming a battery that prevents heat spread.

[0053] Another aspect of the utility model provides a battery, the battery comprising the above-mentioned battery structure.

[0054] The shape of the battery can be any one of a cylindrical shape, a triangular prism shape, and a rectangular shape. The shape of the first nickel sheet 21 and / or the second nickel sheet 22 is the same as the shape of the battery.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery structure, characterized in that: It comprises a fixed bracket, a plurality of mica barrels and a plurality of battery cells. The plurality of mica barrels are sleeved on the outer circumference of the plurality of battery cells in one-to-one correspondence. The plurality of mica barrels and the plurality of battery cells are fixed on the fixed bracket, and adjacent mica barrels are isolated by the fixed bracket.

2. The battery structure according to claim 1, characterized in that: The fixed bracket includes a first bracket and a second bracket, one end of the first bracket is provided with at least one first limiting groove, one end of the second bracket is provided with a second limiting groove at a position corresponding to the first limiting groove, the two ends of the battery cell are respectively located in the first limiting groove and the second limiting groove, and the two ends of the mica barrel are respectively abutted against the ends of the first limiting groove and the second limiting groove.

3. The battery structure according to claim 2, characterized in that: A first extending piece is disposed on the outer periphery of the end of the first limiting groove, and a second extending piece is disposed on the outer periphery of the end of the second limiting groove. The first extending piece is connected to the second extending piece via a clamping structure.

4. The battery structure according to claim 2, characterized in that: A groove portion is provided at the other end of the first bracket, and a first nickel sheet is provided in the groove portion. Multiple ends of the first nickel sheet close to the surface of the battery cell are respectively used to connect with one end of the multiple battery cells, and a surface of the first nickel sheet away from the battery cell is connected to a PCM board.

5. The battery structure according to claim 4, characterized in that: The first nickel sheet includes a first welding sheet, a first connecting sheet and a second welding sheet. Two first welding sheets are provided. Both ends of the first connecting sheet are respectively connected to the first welding sheet. A surface of each of the first welding sheets is provided with a plurality of first welding points. The first welding points are used for welding to the poles of the battery cell. One side of the connecting sheet is connected to the second welding sheet. The extension directions of the second welding sheet and the first welding point are opposite. A slot is provided on the PCM board. The second welding sheet passes through the slot to be connected to an external circuit. The other surfaces of the plurality of first welding sheets are all welded to the PCM board.

6. The battery structure according to claim 5, characterized in that: A second nickel sheet is provided at the other end of the second bracket, and the second nickel sheet includes a third welding sheet, a second connecting sheet and a fourth welding sheet. There are four third welding sheets, and the second connecting sheet is provided in an I-shape. The four corners of the second connecting sheet are provided with the third welding sheets, and a surface of each of the third welding sheets is provided with a plurality of second welding points. The second welding point is provided on a side close to the battery cell for welding to the pole of the battery cell. The fourth welding sheet is connected to one side of the third welding sheet, and the extension direction of the fourth welding sheet and the second welding point is the same. The fourth welding sheet is used to connect to an external circuit.

7. The battery structure according to claim 6, characterized in that: A fuse is arranged in the middle of the first nickel sheet and / or the second nickel sheet.

8. The battery structure according to claim 3, characterized in that: The clamping structure includes a buckle and a slot, and the first extension piece and the second extension piece are each independently selected from one of the buckle and the slot.

9. The battery structure according to claim 2, characterized in that: The side wall of the first limiting groove is provided with a first bone fixing piece, and the side wall of the second limiting groove is provided with a second bone fixing piece, and the first bone fixing piece and the second bone fixing piece are both used to fix the battery core.

10. A battery, characterized in that: The battery comprises a battery structure as described in any one of claims 1-9.

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