Battery and electric equipment

Abstract

The utility model relates to a battery and electric equipment, which comprises a shell component, the shell component comprises a shell, a top cover component and a connecting component, at least one end of the shell is provided with an opening, and an accommodating cavity is formed in the shell; the top cover assembly comprises a top cover piece, the edge of one side of the top cover piece is connected with the shell through the connecting component, and at least one side surface of the connecting component is sunken to form a weak part; the battery cell assembly is contained in the containing cavity, the shell, the top cover piece and the connecting component are integrally formed, and the weak part comprises a first area and at least one second area. When thermal runaway of the battery occurs, the weak part can be used as a safe detonating port, so that exhaust can be more efficiently and quickly realized, and the arrangement of the connecting component does not influence the area of the top cover assembly and the shell, so that the utilization rate of the space in the battery is not influenced, and the safety of the battery is improved. Furthermore, the space utilization rate in the battery can be improved, and the energy density of the battery cell is improved.

Description

Technical Field

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

[0002] The shell of a lithium-ion battery is usually composed of an aluminum-plastic film and an alloy shell. The shell and the top cover assembly are welded to seal the electrode assembly inside the shell. The top cover assembly usually includes positive / negative poles, upper and lower insulating parts, sealing rings, explosion-proof plates, etc. In order to improve the utilization rate of system integration, the external dimensions of lithium batteries are usually made longer (blade batteries), and the lithium battery explosion-proof valve is generally set on the top cover assembly or on the shell.

[0003] However, the deficiency of the prior art is that, due to the limited area of ​​the top cover assembly, the area of ​​the explosion-proof disk is also limited, and the size of the explosion-proof disk cannot be designed to be too large. On the other hand, the shell will deform during the assembly and use of the system, and the explosion-proof disk will be easily failed prematurely due to the deformation of the shell. Utility Model Content

[0004] To this end, the technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a battery and electrical equipment that can exhaust more effectively and quickly when the lithium battery has thermal runaway, thereby reducing safety risks; and greatly improve the volume utilization rate of the battery cell and increase the energy density of the battery cell.

[0005] In order to solve the above technical problems, the utility model provides a battery, comprising:

[0006] A shell assembly, comprising a shell, a top cover assembly and a connecting member, wherein at least one end of the shell has an opening, and an accommodating cavity is formed inside the shell; the top cover assembly comprises a top cover sheet, one side edge of the top cover sheet is connected to the shell through the connecting member, and at least one side surface of the connecting member is recessed to form a weak portion;

[0007] The battery core assembly is accommodated in the accommodating cavity.

[0008] In an embodiment of the present invention, the shell, the top cover sheet and the connecting member are integrally formed.

[0009] In one embodiment of the present invention, the weak portion includes a first area and at least one second area, the second area and the first area are arranged in sequence along the extension direction of the edge of the top cover sheet, and the thickness of the second area is greater than the thickness of the first area.

[0010] In one embodiment of the present invention, the thickness of the weak portion increases uniformly from the first area to the second area.

[0011] In one embodiment of the present invention, the other edges of the top cover sheet are welded to the shell.

[0012] In one embodiment of the utility model, at least one protrusion is provided on a side of the top cover sheet close to the battery cell assembly, the protrusion abuts against the battery cell assembly, and an insulating layer is provided on a side of the protrusion facing the battery cell assembly.

[0013] In one embodiment of the utility model, the shell includes a connecting shell, a first shell and a second shell, the first shell and the second shell are respectively arranged at two ends of the connecting shell, the top cover assembly includes a first top cover sheet and a second top cover sheet, and the connecting member includes a first connecting member and a second connecting member;

[0014] One edge of the first top cover sheet is connected to the first shell through the first connecting member;

[0015] Or / and, one edge of the second top cover sheet is connected to the second shell through the second connecting member.

[0016] In one embodiment of the utility model, the connecting shell is insulated and arranged between the first shell and the second shell, and the battery cell assembly has a first pole ear and a second pole ear extending from both end surfaces respectively; the first top cover sheet or the first shell is connected to the first pole ear; and the second shell is connected to the second pole ear.

[0017] In one embodiment of the utility model, the first shell and the second shell are provided with mounting holes, the connecting shell is provided with a clamping portion, the clamping portion matches the mounting holes, and the connecting shell is connected to the first shell and the second shell through the clamping portion.

[0018] The utility model also discloses an electrical device, comprising the battery as described above.

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

[0020] A battery according to the utility model is provided with a shell assembly and a cell assembly, wherein the shell assembly comprises a shell, a top cover assembly and a connecting member, the top cover assembly comprises a top cover sheet, one side edge of the top cover sheet is connected to the shell through the connecting member, and at least one side surface of the connecting member is provided with a weak portion;

[0021] In this way, when thermal runaway occurs in the battery, the weak portion can serve as a safe detonation vent, so that exhaust can be achieved more efficiently and quickly. In addition, the setting of the connecting member will not affect the area of ​​the top cover assembly and the shell, and thus will not affect the space utilization inside the battery. In turn, it can also improve the space utilization inside the battery and increase the energy density of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein:

[0023] Figure 1 It is a schematic diagram of the overall structure installation completion of the preferred embodiment of the utility model.

[0024] Figure 2 It is a schematic diagram of the pre-installation state of the overall structure of the preferred embodiment of the utility model.

[0025] Figure 3 It is a partial structural schematic diagram of the second shell, the second top cover sheet and the second connecting member of the preferred embodiment of the utility model.

[0026] Figure 4 yes Figure 3 A partial enlarged view of .

[0027] Figure 5 yes Figure 4 Schematic diagram of the three-dimensional structure.

[0028] Figure 6 It is an exploded view of the overall structure of a preferred embodiment of the utility model.

[0029] Figure 7 yes Figure 2 Schematic diagram of the side structure.

[0030] Explanation of the reference numerals in the specification: 1. Shell; 10. Connecting shell; 11. First shell; 12. Second shell; 2. Top cover assembly; 20. Protrusion; 31. First connecting member; 32. Second connecting member; 30. Weak portion; 301. First area; 302. Second area; 4. Battery cell assembly; 41. First pole ear; 42. Second pole ear; 5. Support plate; 51. First support plate; 52. Second support plate; 6. Mounting hole. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0032] Embodiment 1

[0033] Reference Figure 1 and Figure 4 As shown, the utility model discloses a battery, including a shell assembly, wherein the shell assembly includes a shell 1, a top cover assembly 2 and a connecting member.

[0034] At least one end of the housing 1 has an opening, and a receiving cavity is formed inside the housing 1 .

[0035] The top cover assembly 2 includes a top cover sheet, one side edge of which is connected to the shell 1 via the connecting member, and at least one side surface of the connecting member is recessed to form a weak portion 30, so that when the battery undergoes thermal runaway, the weak portion 30 can serve as a safe detonation port to achieve explosion with less pressure, thereby quickly releasing heat.

[0036] The battery further includes a cell assembly 4 , and the cell assembly 4 is received in the accommodating cavity through the opening.

[0037] It can be known from this that a battery to be protected by the present invention is provided with a shell assembly and a cell assembly, wherein the shell assembly includes a shell, a top cover assembly and a connecting member, the top cover assembly includes a top cover sheet, one side edge of the top cover sheet is connected to the shell through a connecting member, and at least one side surface of the connecting member is provided with a weak portion, so that when thermal runaway occurs in the battery, the weak portion can be used as a safe detonation port, so that exhaust can be achieved more efficiently and quickly, and the setting of the connecting member will not affect the area of ​​the top cover assembly and the shell, and thus will not affect the space utilization inside the battery, thereby improving the space utilization inside the battery and increasing the energy density of the cell.

[0038] As a preferred embodiment, the shell 1, the top cover sheet and the connecting member are integrally formed. Such a configuration can facilitate processing on the one hand, and can effectively ensure the stability of the battery structure on the other hand.

[0039] As a preferred embodiment, two weak portions 30 are provided, and the two weak portions 30 are respectively arranged on both sides of the connecting member.

[0040] Further, refer to Figure 5As shown, the weak portion 30 includes a first area 301 and at least one second area 302, the first area 301 and the second area 302 are sequentially arranged along the extension direction of the edge of the top cover sheet, and the thickness of the second area 302 is greater than the thickness of the first area 301. Such an arrangement can facilitate the folding of the top cover sheet to connect with the shell 1, thereby improving the convenience of processing. In other words, the thickness of the weak portion is positively correlated with the withstand voltage value. The thicker the thickness, the higher the withstand voltage value, and the less likely it is to rupture; conversely, the smaller the thickness, the lower the withstand voltage value, and the more likely it is to rupture. Therefore, when the battery has thermal runaway, the first area ruptures first, and then drives the second area to rupture, which can ensure the strength of the battery while responding to the thermal runaway of the battery in a timely manner.

[0041] Furthermore, the first region 301 can be located in the middle of the connecting member in the extension direction of the top cover, and the second region is connected and arranged in the extension direction of the edge of the top cover, and can be arranged on one side or both sides of the first region. When the battery has thermal runaway, the first region located in the middle ruptures, driving the rupture of both sides, so that the entire connecting member can rupture and release pressure and exhaust. In addition, the first region can also be arranged at one end or both ends of the connecting member.

[0042] As a preferred embodiment, the thickness of the weak portion 30 increases uniformly from the first region 301 to the second region 302. The uniform increase in the first region and the second region can avoid a sudden change in the thickness of the weak portion, thereby stabilizing the strength of the weak portion.

[0043] Of course, in another embodiment, the thickness of the weak portion 30 may also increase in a step-like manner from the first region 301 to the second region 302. The thickness gradient between the first region and the second region increases, and the first region can respond to battery thermal runaway more promptly, reducing the influence of the second region on the withstand voltage value of the first region.

[0044] As a preferred implementation, in order to ensure that the weak portion 30 has a certain structural strength and is evenly stressed when bent, two second regions 302 are provided and are symmetrically arranged on both sides of the first region 301 .

[0045] As a preferred embodiment, the other edges of the top cover sheet are welded to the shell 1. Welding can ensure the connection reliability and sealing between the top cover sheet and the shell, and ensure that the electrolyte in the shell is not in contact with the outside world. At the same time, welding is a stable connection method with high connection strength, which can ensure that the pressure is released from the weak part when the battery is thermally runaway, and avoid deformation and failure at other positions.

[0046] Furthermore, the other edges of the top cover sheet are welded to the shell 1 to form a welding depth, and the welding depth gradually increases from the weak portion to the position away from the weak portion. The welding depth directly affects the welding strength. The greater the depth, the higher the welding strength. It should be noted that the welding depth includes the welding penetration width and the welding penetration depth, that is, the depth and width of the welding. The welding depth can be adjusted by adjusting the penetration depth and the width. By adjusting the welding depth, the welding strength of the welding position gradually increases from the weak portion, making the transition between the weak portion and the welding position more uniform and stable.

[0047] Embodiment 2

[0048] Different from the first embodiment, Figure 2 as well as Figure 6 From the perspective of the top cover, at least one protrusion 20 is provided on the side of the top cover sheet close to the battery cell assembly 4, and the protrusion 20 abuts against the battery cell assembly 4. The protrusion 20 is used to abut against the battery cell assembly 4 for limiting the position, thereby preventing the battery cell from moving up and down inside the shell 1.

[0049] In order to avoid contact short circuit, an insulating layer is provided on the side of the protrusion 20 facing the battery cell assembly 4 .

[0050] Embodiment 3

[0051] The difference from the first and second embodiments is that, referring to Figure 2 , Figure 5 as well as Figure 6 As shown, the housing 1 includes a connecting housing 10 , a first housing 11 and a second housing 12 , wherein the first housing 11 and the second housing 12 are respectively disposed at two ends of the connecting housing 10 .

[0052] In terms of details, the top cover assembly 2 includes a first top cover piece 21 and a second top cover piece 22, and the connecting component includes a first connecting member 31 and a second connecting member 32; at least one side surface of the first connecting member 31 is recessed to form a first weak portion, and at least one side surface of the second connecting member 32 is recessed to form a second weak portion.

[0053] One edge of the first top cover sheet 21 is connected to the first shell 11 through the first connecting member 31 ; or one edge of the second top cover sheet 22 is connected to the second shell 12 through the second connecting member 32 .

[0054] Of course, in some other embodiments, one edge of the first top cover sheet 21 is connected to the first shell 11 through the first connecting member 31 , and correspondingly, one edge of the second top cover sheet 22 is connected to the second shell 12 through the second connecting member 32 .

[0055] refer to Figure 6As a preferred embodiment, the connecting shell 10 is insulated and arranged between the first shell 11 and the second shell 12 .

[0056] The cell assembly 4 includes a cell body, a first pole tab 41 and a second pole tab 42 . The cell body has a first pole tab 41 and a second pole tab 42 extending from both end surfaces thereof, respectively. The first pole tab 41 and the second pole tab 42 have opposite polarities.

[0057] The first top cover sheet 21 or the first shell 11 is electrically connected to the first pole ear 41; the second shell 12 is electrically connected to the second pole ear 42. At this time, the first shell and the second shell are charged bodies and can be used as electrode terminals to conduct electricity outward.

[0058] In detail, in order to enhance the connection effect, increase the structural strength, and prevent the connection housing 10, the first housing 11, and the second housing 12 from separating after deformation, refer to Figure 6 As shown, the first shell 11 and the second shell 12 are provided with mounting holes 6, and the connecting shell 10 is provided with a clamping portion, which matches the mounting holes 6. In this way, the connecting shell 10 can be stably and tightly connected with the first shell 11 and the second shell 12 through the clamping portion.

[0059] As a preferred embodiment, the connecting shell 10 is made of nano injection molding material, one of the first shell 11 and the second shell 12 is a positive electrode shell, and the other is a negative electrode shell, and the material of the negative electrode shell includes but is not limited to pure copper, nickel-plated copper or copper-aluminum composite plate.

[0060] Specifically, the connecting shell 10 connects the first shell 11 and the second shell 12 to form a receiving space to accommodate the battery cell assembly 4. When the battery cell body is loaded into the receiving space, the first pole ear 41 and the first shell 11 can be directly ultrasonically welded, and the first shell 11 forms an electrical connection as a positive terminal. The second pole ear 42 and the second shell 12 are ultrasonically welded, and the second shell 12 forms an electrical connection as a negative terminal.

[0061] Embodiment 4

[0062] The difference from the first embodiment to the second embodiment is that the battery further includes a support plate 5. Figure 6 as well as Figure 7 From the perspective of the embodiment, the support plate 5 is arranged on at least one side of the width direction of the battery cell assembly 4, and the support plate is located between the battery cell assembly 4 and the shell 1. This can prevent the R angle of the connecting shell 10 from interfering with the battery cell body and avoid powder falling due to impact.

[0063] As a preferred embodiment, the support plate 5 includes a first support plate 51 and a second support plate 52 , and the first support plate 51 and the second support plate 52 are arranged opposite to each other on both sides of the battery cell assembly 4 in the width direction.

[0064] Embodiment 5

[0065] The utility model also discloses an electrical device, comprising a battery as described in the first to fourth embodiments.

[0066] It can be seen from this that the electrical equipment can obtain a relatively stable and long-term power supply through the battery.

[0067] Electrical equipment may be automobiles, portable devices, laptops, ships, spacecraft, electric toys, electric tools, and the like. Automobiles may be fuel-powered automobiles, gas-powered automobiles, or new energy automobiles. New energy automobiles may be pure electric vehicles, hybrid electric vehicles, or extended-range vehicles, and the like; spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiments of the present invention do not impose any special restrictions on the above-mentioned electrical equipment.

[0068] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected 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 utility model can be understood according to specific circumstances.

[0069] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0070] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A battery, characterized in that: include, A shell assembly, comprising a shell (1), a top cover assembly (2) and a connecting member, wherein at least one end of the shell (1) has an opening, and an accommodating cavity is formed inside the shell (1); the top cover assembly (2) comprises a top cover sheet, one side edge of the top cover sheet is connected to the shell (1) via the connecting member, and at least one side surface of the connecting member is recessed to form a weak portion (30); A battery cell assembly (4) is accommodated in the accommodating cavity.

2. A battery according to claim 1, characterized in that: The shell (1), the top cover sheet and the connecting member are integrally formed.

3. A battery according to claim 1, characterized in that: The weak portion (30) comprises a first area and at least one second area, the second area and the first area are arranged in sequence along the extension direction of the edge of the top cover sheet, and the thickness of the second area is greater than the thickness of the first area.

4. A battery according to claim 3, characterized in that: The thickness of the weak portion (30) increases uniformly from the first area to the second area.

5. A battery according to claim 1, characterized in that: The other edges of the top cover sheet are welded to the shell (1) to form a shape.

6. A battery according to claim 1, characterized in that: At least one protrusion (20) is provided on a side of the top cover sheet close to the battery cell assembly (4); the protrusion (20) abuts against the battery cell assembly (4); and an insulating layer is provided on a side of the protrusion (20) facing the battery cell assembly (4).

7. A battery according to any one of claims 1 to 6, characterized in that: The shell (1) comprises a connecting shell (10), a first shell (11) and a second shell (12), wherein the first shell (11) and the second shell (12) are respectively arranged at two ends of the connecting shell (10), the top cover assembly (2) comprises a first top cover sheet (21) and a second top cover sheet (22), and the connecting member comprises a first connecting member (31) and a second connecting member (32); One edge of the first top cover sheet (21) is connected to the first shell (11) via the first connecting member (31); Or / and, one edge of the second top cover sheet (22) is connected to the second shell (12) via the second connecting member (32).

8. A battery according to claim 7, characterized in that: The connecting shell (10) is insulated and arranged between the first shell (11) and the second shell (12); the battery cell assembly (4) has a first pole lug (41) and a second pole lug (42) extending from both end surfaces respectively; the first top cover sheet (21) or the first shell (11) is connected to the first pole lug (41); and the second shell (12) is connected to the second pole lug (42).

9. A battery according to claim 7, characterized in that: The first shell (11) and the second shell (12) are provided with mounting holes, the connecting shell (10) is provided with a clamping portion, the clamping portion matches the mounting holes, and the connecting shell (10) is connected to the first shell (11) and the second shell (12) via the clamping portion.

10. An electrical equipment, characterized in that: A battery comprising a battery as claimed in any one of claims 1 to 9.

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