Battery and electric equipment
The battery design with directional pipes and pressure relief channels addresses the safety issue of delayed pressure release in lithium-ion batteries by enabling timely gas venting, thereby preventing explosions and improving safety.
Patent Information
- Application Number
- CN202323542789.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-25
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-12-25
AI Technical Summary
Existing lithium-ion batteries face safety hazards due to delayed pressure release during thermal runaway, leading to potential explosions, as the existing explosion-proof valves are often ineffective in timely venting the increasing internal pressure.
A battery design featuring a directional pipe and pressure relief channels within the battery cell shell, including an exhaust member and guide channels, allowing for timely and directional gas release during thermal runaway, thereby preventing explosions.
The design effectively vents gas during thermal runaway, reducing the risk of battery explosions and enhancing safety performance by ensuring timely pressure relief.
Smart Images
Figure CN222146496U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of new energy batteries, in particular to a battery and electrical equipment. Background Art
[0002] Lithium-ion batteries stand out among chemical energy storage devices because of their high energy density, no memory effect, long cycle life, and environmental friendliness. They have attracted widespread attention from industries such as electric vehicles and 3C. However, during long-term use, the battery produces gas and the internal pressure increases. At that time, the battery may experience thermal runaway. The existence of explosion-proof valves can achieve the purpose of explosion prevention, thereby reducing battery safety risks. The design structure of existing wound-type battery cells and square aluminum shell batteries is generally to set a single explosion-proof valve on the top of the cover body, and the explosion-proof valve area is generally small, and there is no exhaust part inside the battery cell.
[0003] The shortcoming of the existing technology is that when a lithium battery has a local thermal runaway, the explosion may occur before the pressure is released in time after the explosion-proof valve on the top of the lithium battery is opened, which will cause great losses. Therefore, the existing square lithium-ion batteries have great safety hazards. 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 an electrical device. By arranging a directional pipe inside the battery cell shell of a wound battery cell and a square lithium-ion battery, a pressure relief channel inside the battery is increased, so that the battery cell can be vented in a timely manner when it expands due to heat and thermal runaway, and the battery can be depressurized in time, effectively improving the safety performance of the power battery.
[0005] In order to solve the above technical problems, the utility model provides a battery, comprising:
[0006] A shell having a containing cavity, wherein the shell has a top cover, and the top cover is provided with an explosion-proof hole;
[0007] An exhaust member is arranged in the accommodating cavity; the exhaust member extends along a first direction; the exhaust member has an exhaust passage, the exhaust member has an exhaust end and an exhaust end which are arranged opposite to each other along the first direction, the exhaust end of the exhaust member is fitted with the top cover, and the exhaust passage is connected with the explosion-proof hole;
[0008] A base is arranged in the accommodating cavity, the base and the top cover are arranged opposite to each other along a first direction; a guide channel is arranged in the base, the inlet end of the exhaust member is fixedly connected to the base, and the exhaust channel is communicated with the guide channel; an air inlet communicated with the guide channel is arranged on a surface of the base facing the top cover;
[0009] A bare cell group is arranged in the accommodating cavity, and the bare cell group is located between the base and the top cover.
[0010] In one embodiment of the utility model, the bare cell group has a first cell arranged opposite to the explosion-proof hole, the first cell has a center hole extending along a first direction; the exhaust member is inserted into the center hole of the first cell.
[0011] In one embodiment of the present invention, the bare battery cell group has two adjacent second battery cells that are arranged opposite to the explosion-proof hole, and the exhaust member is located between the two adjacent second battery cells.
[0012] In one embodiment of the present invention, a channel communicating with the air inlet is formed between the bare cell group and the peripheral wall of the accommodating cavity.
[0013] In one embodiment of the present invention, the channel includes at least four first channels, and the four first channels are respectively formed between four corners of the accommodating cavity and the bare cell group.
[0014] In one embodiment of the utility model, it also includes an air intake member, which is arranged in the accommodating cavity, and has an air intake channel. The air intake member is fixedly connected to the base, and the air intake channel is connected to the guide channel through an air inlet, and a plurality of air holes are provided on the air intake member.
[0015] In an embodiment of the present invention, four air inlets are provided, and the four air inlets are distributed at four corners of the base.
[0016] In one embodiment of the utility model, a mounting hole communicating with the guide channel is provided on the surface of the base facing the top cover; the inlet end of the exhaust member is plugged into and sealedly connected with the mounting hole of the base.
[0017] In one embodiment of the utility model, the shell also includes an insulating member for insulating the top cover and the bare cell group, and the insulating member and the top cover are in close contact with each other; an air vent is provided at a position of the insulating member directly opposite to the explosion-proof hole; the outlet end of the exhaust member is in close contact with the insulating member, and the outlet end of the exhaust member is provided with an outlet connecting the exhaust channel and the air vent.
[0018] The utility model also provides 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 described in the utility model is provided with a shell, an exhaust member, a base, and a bare cell group, wherein the shell has a containing cavity, a top cover, and an explosion-proof hole arranged on the top cover, the exhaust member is arranged in the containing cavity and the exhaust member has an exhaust channel, the exhaust channel is connected to the explosion-proof hole, a guide channel for gas circulation is arranged inside the base, and an air inlet connected to the guide channel is arranged on the surface of the base opposite to the top cover, and the exhaust channel is also connected to the guide channel. With such arrangement, the gas in the containing cavity can enter the guide channel inside the base through the air inlet, and enter the exhaust channel through the guide channel, and finally be discharged from the battery due to the explosion-proof hole connected to the exhaust channel, when the battery cell is thermally runaway, the cooperation of the guide channel and the exhaust channel can realize directional eruption, so that the heat accumulated inside the battery can be quickly discharged and released in a short time, effectively avoiding the heat spread of the battery cell, effectively improving the safety performance of the power battery, and avoiding the explosion of the battery and the loss caused thereby. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] 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:
[0022] Figure 1 It is a front cross-sectional structural diagram of a preferred embodiment of the utility model.
[0023] Figure 2 It is a top view cross-sectional structural diagram of a preferred embodiment of the utility model.
[0024] Figure 3 It is a structural schematic diagram of a base of a preferred embodiment of the utility model.
[0025] Figure 4 It is a schematic structural diagram of an exhaust component of a preferred embodiment of the utility model.
[0026] Figure 5 It is a top view of the cross-sectional structure of the preferred embodiment of the utility model when the second battery cell is provided.
[0027] Explanation of the reference numerals in the specification: 1. outer shell; 11. exhaust part; 110. air outlet; 2. top cover; 20. explosion-proof hole; 21. explosion-proof valve; 3. base; 31. air inlet; 32. mounting hole; 4. first battery cell; 41. center hole; 42. first channel; 5. second battery cell. DETAILED DESCRIPTION
[0028] 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.
[0029] Embodiment 1
[0030] Reference Figure 1 to Figure 2 As shown, the utility model discloses a battery, which includes a shell 1 and an explosion-proof valve 21. The shell 1 has a containing cavity inside, wherein the shell 1 has a top cover 2, and the top cover 2 is provided with an explosion-proof hole 20; the explosion-proof valve 21 is arranged in the explosion-proof hole 20.
[0031] The battery further includes an exhaust member 11, which is disposed in the accommodating cavity; the exhaust member 11 extends along a first direction. The exhaust member 11 has an exhaust channel, and the exhaust member 11 has an exhaust end and an exhaust end that are oppositely disposed along the first direction. The exhaust end of the exhaust member 11 is in contact with the top cover 2, and the exhaust channel is in communication with the explosion-proof hole 20.
[0032] Combination Figure 3 From the perspective of the battery, the battery further includes a base 3, which is disposed in the accommodating cavity, and the base 3 and the top cover 2 are disposed opposite to each other along a first direction; a guide channel is disposed in the base 3, the inlet end of the exhaust member 11 is fixedly connected to the base 3, and the exhaust channel is connected to the guide channel. An air inlet 31 connected to the guide channel is disposed on the surface of the base 3 facing the top cover 2.
[0033] The battery further includes a bare cell group, which is disposed in the accommodating cavity and located between the base 3 and the top cover 2 .
[0034] It can be seen from this that when the battery of this embodiment produces gas during operation, the gas will preferentially enter the guide channel through the air inlet 31, and then enter the exhaust channel through the guide channel; since the outlet end of the exhaust member 11 is in contact with the top cover 2, and the exhaust channel is connected to the explosion-proof hole 20, when the gas in the exhaust channel reaches a certain amount, the explosion-proof valve arranged at the explosion-proof hole 20 will be opened preferentially, thereby ensuring the purpose of directional eruption, and solving the problem that the explosion-proof valve of the existing battery has not been opened when thermal runaway occurs, but the battery has already exploded.
[0035] Reference Figure 1 , Figure 2 as well as Figure 4 As shown, as a preferred embodiment, the bare cell group has a first cell 4 arranged opposite to the explosion-proof hole 20, and the first cell 4 has a central hole 41 extending along the first direction. The exhaust member 11 is inserted into the central hole 41 of the first cell 4.
[0036] In the above embodiment, the central hole 41 of the first battery cell 4 is fully utilized to set the exhaust member 11, which can reduce the space occupied by the exhaust member 11 in the accommodating cavity, thereby reducing the loss of battery energy density.
[0037] Of course, refer to Figure 5 As shown, in another embodiment, the bare cell group may also have two adjacent second cells 5 arranged opposite to the explosion-proof hole 20. Specifically, the two second cells 5 are accommodated in the accommodating cavity side by side, and the exhaust member 11 is located between the two adjacent second cells 5.
[0038] Since the bare cells are usually wound, that is, the corners of the bare cells in the bare cell group have a certain curvature, and since the cross-section of the accommodating cavity of the housing 1 is rectangular, there is a channel between the inner peripheral wall of the accommodating cavity and the bare cell group. The air inlet 31 is arranged directly opposite to the channel, so that a channel connected to the air inlet 31 is formed between the bare cell group and the peripheral wall of the accommodating cavity.
[0039] Combination Figure 2 From the perspective of a preferred embodiment, the channel includes at least four first channels 42, and the four first channels 42 are respectively formed between the four corners of the accommodating cavity and the bare cell group. At this time, four air inlets 31 are provided, and the four air inlets 31 are distributed at the four corners of the base 3.
[0040] It should be noted that, combined with Figure 5 From the perspective of FIG. 1 , when the bare cell group has at least two bare cells, the channel not only includes four first channels 42 , but also includes a second channel formed by the side wall of the accommodating cavity and the corner portions of two adjacent bare cells.
[0041] In another embodiment, the battery further includes an air intake member, which is disposed in the accommodating cavity and has an air intake channel, the air intake member is fixedly connected to the base 3, and the air intake channel is connected to the guide channel through an air inlet 31. In order to facilitate the gas in the accommodating cavity to enter the air intake member, the air intake member is provided with a plurality of air holes for gas circulation.
[0042] As a preferred embodiment, the air inlet member is disposed in the above-mentioned channel. Further, the air inlet member is disposed in the first channel 42 , and in this case, four air inlets 31 are disposed, and the four air inlets 31 are distributed at the four corners of the base 3 .
[0043] It should be noted that, in order to facilitate the gas in the accommodating cavity to enter the air inlet member through the air hole, the size of the air inlet member is slightly smaller than the first channel 42, so that there is a certain gap between the air inlet member and the first channel, and the air inlet member and the first channel 42 can be similar in shape.
[0044] refer to Figure 1 , Figure 2 and Figure 3 In detail, the surface of the base 3 facing the top cover 2 is provided with a mounting hole 32 connected to the guide channel; the inlet end of the exhaust member 11 is plugged and sealed with the mounting hole 32 of the base 3. Specifically, the exhaust member 11 is tightly connected to the mounting hole 32 via a seal; or, the exhaust member 11 and the base 3 are integrally formed, so that the exhaust member 11 and the mounting hole 32 can also be seamlessly connected to prevent gas from escaping in the accommodating cavity.
[0045] like Figure 1 and Figure 4 As shown, in detail, the housing 1 also includes an insulating member for insulating the top cover 2 and the bare cell group, and the insulating member and the top cover 2 are in close contact. Specifically, an air vent is provided at the position of the insulating member directly opposite to the explosion-proof hole 20. The outlet end of the exhaust member 11 is in close contact with the insulating member 12, and the outlet end of the exhaust member 11 is provided with an air outlet 110 connecting the exhaust channel and the air vent. In this way, the gas in the exhaust channel can pass through the air outlet 110 and the air vent in sequence to reach the explosion-proof hole 20, thereby breaking through the explosion-proof valve 21 and being discharged from the explosion-proof hole 20.
[0046] Embodiment 2
[0047] The utility model also discloses an electrical device, comprising the battery as described in the first embodiment.
[0048] From this, it can be known that the electrical equipment to be protected by the utility model effectively increases the pressure relief channel inside the battery by arranging a directional pipe inside the wound battery cell and the square lithium-ion battery, so that when the battery cell expands due to heat and thermal runaway occurs, a directional exhaust channel can be formed through the cooperation of the guide channel and the exhaust pipe, thereby achieving directional exhaust of the gas inside the battery, thereby being able to relieve the pressure of the battery in time, and effectively improving the safety performance of the power battery, avoiding battery explosion and the resulting losses.
[0049] Specifically, the electrical equipment may be a car, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The car may be a fuel car, a gas car, or a new energy car, and the new energy car may be a pure electric car, a hybrid car, or an extended-range car, and the like; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the 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; the 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.
[0050] 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.
[0051] 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.
[0052] 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; it can be a direct connection, or it can be indirectly connected 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.
[0053] 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 housing (1) having a containing cavity, wherein the housing (1) has a top cover (2), and the top cover (2) is provided with an explosion-proof hole (20); An exhaust member (11) is arranged in the accommodating cavity; the exhaust member (11) extends along a first direction; the exhaust member (11) has an exhaust passage, the exhaust member (11) has an exhaust end and an exhaust end which are arranged opposite to each other along the first direction, the exhaust end of the exhaust member (11) is in contact with the top cover (2), and the exhaust passage is in communication with the explosion-proof hole (20); A base (3) is arranged in the accommodating cavity, the base (3) and the top cover (2) are arranged opposite to each other along a first direction; a guide channel is arranged in the base (3), an inlet end of the exhaust member (11) is fixedly connected to the base (3), and the exhaust channel is communicated with the guide channel; an air inlet (31) is arranged on a surface of the base (3) facing the top cover (2) and communicated with the guide channel; A bare cell group is arranged in the accommodating cavity, and the bare cell group is located between the base (3) and the top cover (2).
2. A battery according to claim 1, characterized in that: The bare battery cell group comprises a first battery cell (4) arranged opposite to the explosion-proof hole (20), the first battery cell (4) comprising a central hole (41) extending along a first direction; the exhaust member (11) is arranged through the central hole (41) of the first battery cell (4).
3. A battery according to claim 1, characterized in that: The bare battery cell group comprises two adjacent second battery cells (5) which are arranged opposite to the explosion-proof hole (20), and the exhaust member (11) is located between the two adjacent second battery cells (5).
4. A battery according to claim 1, characterized in that: A channel communicating with the air inlet (31) is formed between the bare cell group and the peripheral wall of the accommodating cavity.
5. A battery according to claim 4, characterized in that: The channel comprises at least four first channels (42), and the four first channels (42) are respectively formed between four corners of the accommodating cavity and the bare cell group.
6. A battery according to claim 1, characterized in that: It also includes an air intake member, which is arranged in the accommodating cavity and has an air intake channel. The air intake member is fixedly connected to the base (3), and the air intake channel is connected to the guide channel through an air inlet (31). The air intake member is provided with a plurality of air holes.
7. A battery according to claim 4, 5 or 6, characterized in that: Four air inlets (31) are provided, and the four air inlets (31) are distributed at four corners of the base (3).
8. A battery according to claim 6, characterized in that: A mounting hole (32) communicating with the flow guide channel is provided on the surface of the base (3) facing the top cover (2); the inlet end of the exhaust member (11) is plugged into and sealedly connected to the mounting hole (32) of the base (3).
9. A battery according to claim 1, characterized in that: The housing (1) further comprises an insulating member for insulating the top cover (2) and the bare cell group, the insulating member and the top cover (2) being fitted together; an air vent is provided at a position of the insulating member directly opposite to the explosion-proof hole (20); the outlet end of the exhaust member (11) is fitted together with the insulating member, and the outlet end of the exhaust member (11) is provided with an air outlet (110) communicating with the exhaust channel and the air vent.
10. An electrical equipment, characterized in that: A battery comprising a battery as claimed in any one of claims 1 to 9.