Battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery and electric equipment. The shell is provided with a closed cavity, and a through hole is formed in the shell wall; the electrode assembly is accommodated in the closed cavity; the anti-explosion sheet is mounted in the through hole; the first blocking piece is installed in the through hole and located on the side, away from the electrode assembly, of the anti-explosion piece, the first blocking piece comprises a fixing part and a first blocking part, the fixing part is connected with the shell wall, and the first blocking part is connected with the fixing part and can rotate relative to the shell wall; and the first blocking part is used for blocking sprayed objects when the explosion-proof sheet opens the valve and releases pressure. According to the utility model, the first blocking sheet can block sprayed objects flowing out along with air flow when the explosion-proof sheet is opened to release pressure, so that the sprayed objects are prevented from entering a module or a battery pack to cause out-of-control of other batteries.

Description

Technical Field

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

[0002] When a battery malfunctions, high-temperature and high-pressure gases are generated inside it. If not released in time, it will cause the battery to explode. Therefore, an explosion-proof valve is usually configured on the battery. The explosion-proof valve can quickly release the gas inside the battery in the above situation, thereby playing a role in pressure relief.

[0003] However, during the process of the explosion-proof valve opening for pressure relief, the high-speed ejected airflow takes out various tiny debris inside the battery. Among them, if the debris has conductive properties, such as metal foil, once it is ejected onto the module or battery pack, it is very likely to contact and affect other batteries inside the module or battery pack, thereby exacerbating the spread of the thermal runaway phenomenon and posing a major threat to the overall safety of the battery.

[0004] Therefore, how to block the ejected matter flowing out with the airflow when the explosion-proof valve opens is an urgent problem to be solved. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a battery and an electrical device, which solve the problem that the ejected matter flowing out with the airflow cannot be blocked when the existing explosion-proof valve opens.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] In a first aspect, the utility model provides a battery, which includes a housing having a sealed cavity and a through hole opened on the housing wall; an electrode assembly accommodated in the sealed cavity; an explosion-proof sheet installed in the through hole; a first blocking sheet installed in the through hole and located on the side of the explosion-proof sheet away from the electrode assembly. The first blocking sheet includes a fixing part and a first blocking part. The fixing part is connected to the housing wall, and the first blocking part is connected to the fixing part and can rotate relative to the housing wall. The first blocking part is used to block the ejected matter when the explosion-proof sheet opens for pressure relief.

[0008] In some embodiments, one end of the fixing part connecting the first blocking part extends into the through hole, and the fixing part can block the ejected matter when the explosion-proof sheet opens for pressure relief.

[0009] In some embodiments, the thickness of the first blocking part is less than the thickness of the fixing part.

[0010] In some embodiments, opposite ends of the fixing part are respectively connected to different positions of the housing wall, and the number of the first blocking parts is multiple. The multiple first blocking parts are respectively connected to opposite sides of the fixing part.

[0011] In some embodiments, along the axial direction of the through hole, the orthographic projection area of the fixing part in the through hole is S1, and the area of the through hole is S2, satisfying the relationship: 1 / 3 ≤ S1 / S2 ≤ 2 / 3. The fixing part can be used to block the ejected matter when the explosion-proof sheet opens the valve to relieve pressure.

[0012] In some embodiments, the first blocking sheet further includes a second blocking part, which is connected to the shell wall and fixed relative to the shell wall. The second blocking part is used to block the ejected matter when the explosion-proof sheet opens the valve to relieve pressure.

[0013] In some embodiments, the number of the first blocking parts is multiple, and the multiple first blocking parts are circumferentially arranged around the through hole.

[0014] In some embodiments, the explosion-proof sheet includes a pressure relief part and a non-pressure relief part, and the non-pressure relief part is used to block the ejected matter when the explosion-proof sheet opens the valve to relieve pressure.

[0015] In some embodiments, along the axis direction of the through hole, the orthographic projection of the non-pressure relief part and the orthographic projection of the fixing part in the through hole do not coincide or partially coincide; or,

[0016] When the first blocking sheet includes a second blocking part, along the axis direction of the through hole, the orthographic projection of the non-pressure relief part and the orthographic projection of the second blocking part do not coincide or partially coincide.

[0017] In some embodiments, the battery further includes a second blocking sheet, which is installed between the explosion-proof sheet and the first blocking sheet, fixed relative to the shell wall, and partially blocks the through hole; along the axis direction of the through hole, the orthographic projection of the second blocking sheet and the orthographic projection of the non-pressure relief part do not coincide or partially coincide.

[0018] In some embodiments, at least one of the non-pressure relief part, the second blocking sheet, and the first blocking sheet is provided with a plurality of ventilation holes.

[0019] In a second aspect, the present invention further provides an electrical device, including the above-mentioned battery.

[0020] Advantageous effects: By arranging the first blocking sheet on the air flow path, when relieving pressure, when the air flow hits the first blocking sheet, the first blocking sheet can block the ejected matter flowing out with the air flow. In addition, the sequentially arranged non-pressure relief part and the first blocking sheet, or the non-pressure relief part, the second blocking sheet, and the first blocking sheet provide multiple blocking effects for the battery, improve the blocking effect on the ejected matter, and reduce the risk of other batteries getting out of control caused by the ejected matter spraying into the module or the battery pack. Description of the Drawings

[0021] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following accompanying drawings only show some embodiments of the present utility model, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related accompanying drawings can also be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is: a schematic diagram of the overall battery structure in Embodiment 1 in the non-pressure relief state;

[0023] Figure 2 It is: a schematic diagram of the top cover structure in Embodiment 1 in the non-pressure relief state;

[0024] Figure 3 It is: a schematic diagram of the top cover structure in Embodiment 1 in the pressure relief state;

[0025] Figure 4 It is: a schematic diagram of an optional top cover structure of the present utility model in the pressure relief state (the fixing part has no blocking effect);

[0026] Figure 5 It is: a schematic diagram of an optional top cover structure of the present utility model in the pressure relief state (the fixing part has a blocking effect);

[0027] Figure 6 It is: the top cover of the present utility model in the pressure relief state Figure 5 a schematic diagram of the structure from another perspective;

[0028] Figure 7 It is: a schematic diagram of an optional top cover structure of the present utility model in the pressure relief state (the fixing part has no blocking effect);

[0029] Figure 8 It is: a schematic diagram of an optional top cover structure of the present utility model in the pressure relief state;

[0030] Figure 9 It is: a schematic diagram of the top cover structure in Embodiment 2 in the non-pressure relief state;

[0031] Figure 10 It is: a schematic diagram of the top cover structure in Embodiment 2 in the pressure relief state;

[0032] Figure 11 It is: a schematic diagram of an optional top cover structure of the present utility model in the pressure relief state;

[0033] Figure 12 It is: a schematic diagram of the top cover structure in Embodiment 3 in the pressure relief state.

[0034] Among them, the reference numerals are explained as follows:

[0035] 100. Battery;

[0036] 10. Housing; 11. Housing body; 12. Top cover; 13. Through hole; 131. Groove;

[0037] 20. First blocking piece; 21. Fixing part; 22. First blocking part; 23. Second blocking part;

[0038] 30. Second blocking piece;

[0039] 40. Explosion-proof film; 41. Pressure relief part; 42. Non-pressure relief part;

[0040] 50. Electrode assembly; Detailed implementation manner

[0041] As used in the specification and claims, certain terms are used to refer to specific components. Those skilled in the art should understand that different nouns may be used to refer to the same component. The specification and claims do not use the difference in names as a way to distinguish components, but use the difference in functions of components as the criterion for distinction. As mentioned throughout the specification and claims, "comprising" is an open-ended term and should be interpreted as "including but not limited to". "Substantially" means within an acceptable error range. Those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects. In addition, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In practice, the inventor of the present utility model found that during the process of the explosion-proof valve opening and relieving pressure, the high-speed ejected airflow will carry ejecta such as diaphragm debris, positive and negative electrode material residues, and metal foil debris. If these ejecta contain conductive substances, such as metal foil debris, once they are brought into the inside of the module or battery pack, it is very likely to trigger abnormal reactions in other batteries, thus leading to the risk of chain out-of-control inside the module or the entire battery pack. The battery of the present utility model can block the ejecta by setting the first blocking piece and the second blocking piece, thereby reducing the above risks.

[0043] The following further explains the battery of the present utility model in combination with specific embodiments.

[0044] Embodiment 1

[0045] As Figures 1-4As shown in the figure, this embodiment provides a battery 100, which includes: a housing 10, including a housing main body 11 and a top cover 12. The housing main body 11 has a receiving cavity, and the top cover 12 is fastened to the open end of the housing main body 11. Along the thickness direction of the top cover 12, the top cover 12 has a through hole 13; an electrode assembly 50, accommodated in the receiving cavity of the housing main body 11; an explosion-proof sheet 40, installed in the through hole 13; a first blocking sheet 20, installed in the through hole 13 and located on the side of the explosion-proof sheet 40 away from the electrode assembly 50. The first blocking sheet 20 includes a fixing portion 21 and a first blocking portion 22. The fixing portion 21 is connected to the top cover 12, and the first blocking portion 22 is connected to the fixing portion 21 and can rotate relative to the top cover 12. The first blocking portion 22 is used to block the ejected matter when the explosion-proof sheet 40 opens the valve to relieve pressure. It can be understood that the top cover 12 in this embodiment refers to the "shell wall" described in the present utility model. In alternative other embodiments, the through hole 13 can also be opened on the side wall or the bottom wall of the housing main body 11. At this time, the "shell wall" refers to the side wall or the bottom wall of the housing main body 11.

[0046] In this embodiment, the shape of the through hole 13 is circular. Correspondingly, the shape of the first blocking sheet 20 is also circular. In alternative other embodiments, the shape of the through hole 13 can also be square, oval or other shapes. The shape of the first blocking sheet 20 is adapted to the shape of the through hole 13. This embodiment does not limit this.

[0047] As Figure 2 shown, the first blocking sheet 20 is connected to the surface of the top cover 12 on the side away from the electrode assembly 50. And, a groove 131 is opened on this surface. The bottom of the groove 131 communicates with the through hole 13. The fixing portion 21 is located in the groove 131, so that the fixing portion 21 can be flush with the surface of the top cover 12, ensuring that the fixing portion 21 does not interfere with other components outside the battery 100. It should be understood that the way the first blocking sheet 20 is arranged at the through hole 13 is not limited. It can be that the first blocking sheet 20 is located in the through hole 13 and connected to the top cover 12, or it can be located above the through hole 13 and connected to the top cover 12.

[0048] Referring again to Figure 2 , to improve the effect of the first blocking sheet 20 blocking the ejected matter, the end of the fixing portion 21 connecting the first blocking portion 22 extends into the through hole 13. Specifically, the part of the fixing portion 21 extending into the through hole 13 is a semi-circular structure, covering half of the cross-sectional area of the through hole 13. At this time, the fixing portion 21 can also play a role in blocking the ejected matter. Under the combined blocking effect of the first blocking portion 22 and the fixing portion 21, the ejected matter can be blocked to the greatest extent.

[0049] Further, to ensure the effect of the first blocking portion 22 in blocking the ejected matter, in this embodiment, the rotation angle α of the first blocking portion 22 is set to 40°. α is the angle between the plane of the housing wall where the through hole 13 is located (i.e., the plane of the surface of the top cover 12 on the side away from or close to the electrode assembly 50) and the plane where the first blocking portion 22 is located. In alternative embodiments, the range of α is 20° - 60°. Specifically, α is 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55° or 60°, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable. α should not be too large or too small. If α is too large, the blocking effect of the first blocking portion 22 on the ejected matter is limited. If α is too small, the first blocking portion 22 hinders the gas flow. Therefore, limiting α within the above range can take into account both the effects of pressure relief and blocking the ejected matter.

[0050] For the battery 100 of this embodiment, if the pressure relief condition is reached, the high-temperature and high-pressure gas inside the battery 100 will tear the explosion-proof sheet 40, then hit the first blocking sheet 20, and drive the first blocking portion 22 of the first blocking sheet 20 to rotate around the fixing portion 21, and then eject from the through hole 13. Therefore, when the air flow hits the first blocking sheet 20, the first blocking sheet 20 can block the ejected matter carried by the air flow. Figure 3 、 10 The arrow in

[0051] indicates the flow path of the air flow.

[0052] In addition, this embodiment also provides various structural designs of the first blocking sheet 20. Figures 5-7 As shown in Figure 7 , in alternative embodiments, the opposite ends of the fixing portion 21 are respectively connected to different positions on the housing wall, and the number of the first blocking portions 22 is multiple. The multiple first blocking portions 22 are respectively connected to the opposite sides of the fixing portion 21. For example, as shown in

[0053] , the number of the first blocking portions 22 is two, symmetrically connected to the opposite sides of the fixing portion 21. During pressure relief, the two first blocking portions 22 rotate around the fixing portion 21 and approach each other, the through hole 13 is opened, and the gas leaks out from both sides of the fixing portion 21. The ejected matter carried by the air flow is blocked by the two first blocking sheets 20. Figures 5-6 Further, as shown in

[0054] , along the axial direction of the through hole 13, the orthographic projection area of the fixing portion 21 in the through hole 13 is S1, and the cross-sectional area of the through hole 13 is S2, satisfying the relational expression: 1 / 3 ≤ S1 / S2 ≤ 2 / 3. With such a setting, the fixing portion 21 has the function of blocking the ejected matter. Limiting S1 within the above range can ensure that the fixing portion 21 has sufficient blocking area to block the ejected matter.Further, to prevent the fixing part 21 from cracking due to gas impact, the thickness of the fixing part 21 can be increased so that its thickness is greater than that of the first blocking part 22.

[0055] As Figure 8 shown, in other alternative embodiments, the first blocking sheet 20 further includes a second blocking part 23. The second blocking part 23 is connected to the shell wall and is fixed relative to the shell wall. The first blocking part 22 and the second blocking part 23 are arranged opposite to each other, and the second blocking part 23 can also be used to block the ejected matter. The first blocking part 22 and the second blocking part 23 are separately connected to the top cover 12, so that even if one of the blocking parts is damaged, the other blocking part can still function.

[0056] Embodiment 2

[0057] This embodiment provides a battery 100. Different from Embodiment 1, as Figure 9 shown, the explosion-proof sheet 40 includes a pressure relief part 41 and a non-pressure relief part 42. The pressure relief part 41 is used for the explosion-proof sheet 40 to open the valve and relieve pressure, and the non-pressure relief part 42 is used to block the ejected matter. A notch is formed on the pressure relief part 41 to form a weak area. When the pressure relief condition is reached, the pressure relief part 41 is torn from the notch, and the gas is released from the opening formed by the pressure relief part 41. In other alternative embodiments, the pressure relief part 41 can be made of a plastic material. When the preset temperature is reached, the plastic pressure relief part 41 melts to form an opening for pressure relief. The non-pressure relief part 42 can be made of a high-strength material, and is configured to withstand the impact of high-temperature and high-pressure gas without cracking during pressure relief.

[0058] Specifically, when the fixing part 21 has a blocking effect, the non-pressure relief part 42 and the fixing part 21 are arranged in a dislocation manner, that is, along the axis direction of the through hole 13, the orthographic projection of the non-pressure relief part 42 and the orthographic projection of the fixing part 21 in the through hole 13 do not coincide or partially coincide. As Figure 10 shown, the orthographic projection of the non-pressure relief part 42 in this embodiment and the orthographic projection of the fixing part 21 in the through hole 13 do not coincide. The non-pressure relief part 42 and the pressure relief part 41 in this embodiment are both semicircular structures, and the two are combined into a complete circle and completely seal the through hole 13. When relieving pressure, some of the high-temperature and high-pressure gas will first hit the non-pressure relief part 42, then rush out of the pressure relief part, and then hit the first blocking part 22 and the fixing part 21. Therefore, the non-pressure relief part 42, the first blocking part 22 and the fixing part 21 can all block the ejected matter flowing out with the air flow.

[0059] In other alternative embodiments, as Figure 11As shown, the first blocking piece 20 includes a second blocking portion 23. The second blocking piece 30 can also be arranged offset from the fixing portion 21. That is, along the axis direction of the through hole 13, the orthographic projection of the non-pressure-relief portion 42 and the orthographic projection of the second blocking portion 23 do not coincide or partially coincide. When pressure is relieved, some of the high-temperature and high-pressure gas will first hit the non-pressure-relief portion 42, then rush out of the pressure-relief portion, and then hit the first blocking portion 22 and the second blocking portion 23. Therefore, the non-pressure-relief portion 42, the first blocking portion 22, and the second blocking portion 23 can all block the ejected matter flowing out with the air flow.

[0060] In summary, the non-pressure-relief portion 42 and the first blocking piece 20 of this embodiment construct two blocking lines on the air flow path, providing a double blocking effect for the battery 100, and having a better blocking effect on the ejected matter.

[0061] Embodiment 3

[0062] This embodiment provides a battery 100. Different from Embodiment 1, as Figure 2 shown, a second blocking piece 30 is further installed in the through hole 13. The second blocking piece 30 is installed between the explosion-proof piece 40 and the first blocking piece 20, is fixed relative to the shell wall, and partially blocks the through hole 13. The second blocking piece 30 can also block the ejected matter flowing out with the air flow.

[0063] Specifically, the second blocking piece 30 and the non-pressure-relief portion 42 are arranged offset. That is, along the axis direction of the through hole 13, the orthographic projection of the second blocking piece 30 and the orthographic projection of the non-pressure-relief portion 42 do not coincide or partially coincide. As Figure 7 shown, the orthographic projection of the second blocking piece 30 of this embodiment does not coincide with the orthographic projection of the non-pressure-relief portion 42, and the orthographic projection of the second blocking piece 30 and the orthographic projection of the fixing portion 21 also do not coincide.

[0064] In this embodiment, the non-pressure-relief portion 42, the second blocking piece 30, and the fixing portion 21 are arranged offset in sequence, so that the air flow in the battery 100 hits the non-pressure-relief portion 42, the second blocking piece 30, and the first blocking piece 20 in sequence, and then sprays out of the battery 100. Therefore, the non-pressure-relief portion 42, the second blocking piece 30, and the first blocking piece 20 of this embodiment construct three blocking lines on the air flow path, providing a triple blocking effect for the battery 100, and having a better blocking effect on the ejected matter.

[0065] The present utility model does not limit the shapes and area sizes of the non-pressure-relief portion 42 and the second blocking piece 30. Among them, the shape of the second blocking piece 30 is semi-circular, and it is preferably that the area accounts for about half of the cross-sectional area of the through hole 13.

[0066] It should be noted that in all embodiments of the present utility model, in order to avoid affecting the normal circulation of gas and untimely pressure relief, the following measures can be taken: (1) The number of the first blocking portions 22 is set to be multiple, and the multiple first blocking portions 22 are circumferentially arranged around the through hole 13; (2) A number of air holes (not shown in the figure) can be provided in at least one of the non-pressure relief portion 42, the second blocking piece 30, and the first blocking piece 20.

[0067] The present utility model also provides an electrical device, and the battery used therein is one of the above embodiments. The main design key point of the present utility model lies in the improvement of the existing explosion-proof valve. For other structures of the electrical device, such as the electrical connection part and the mechanical structure part of the electrical device, they will not be elaborated one by one.

[0068] The electrical device can be an automobile, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The automobile can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc.; The spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; The electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, a planer, etc. The present utility model does not make special restrictions on the above electrical devices.

[0069] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill 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 enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.

Claims

1. A battery, characterized in that: include A shell (10) having a sealed cavity and a through hole (13) formed in the shell wall; An electrode assembly (50) is accommodated in the sealed cavity; An explosion-proof disk (40) installed in the through hole (13); A first blocking piece (20) is mounted on the through hole (13) and is located on a side of the explosion-proof piece (40) away from the electrode assembly (50). The first blocking piece (20) comprises a fixing portion (21) and a first blocking portion (22). The fixing portion (21) is connected to the shell wall. The first blocking portion (22) is connected to the fixing portion (21) and can rotate relative to the shell wall. The first blocking portion (22) is used to block ejected matter when the explosion-proof piece (40) opens a valve to release pressure.

2. The battery according to claim 1, characterized in that One end of the fixing portion (21) connected to the first blocking portion (22) extends into the through hole (13), and the fixing portion (21) can block the ejected material when the explosion-proof disc (40) opens the valve to release pressure.

3. The battery according to claim 2, characterized in that The thickness of the first blocking portion (22) is smaller than the thickness of the fixing portion (21).

4. The battery according to claim 1, characterized in that The opposite ends of the fixing portion (21) are respectively connected to different positions of the shell wall, and the number of the first blocking portions (22) is multiple, and the multiple first blocking portions (22) are respectively connected to the opposite sides of the fixing portion (21).

5. The battery according to claim 4, characterized in that Along the axial direction of the through hole (13), the orthographic projection area of ​​the fixing portion (21) in the through hole (13) is S1, and the area of ​​the through hole (13) is S2, satisfying the relationship: 1 / 3≤S1 / S2≤2 / 3. The fixing portion (21) can be used to block ejected matter when the explosion-proof disc (40) opens a valve to release pressure.

6. The battery according to claim 1, characterized in that The first blocking piece (20) further comprises a second blocking portion (23), the second blocking portion (23) being connected to the shell wall and fixed relative to the shell wall, the second blocking portion (23) being used to block ejected matter when the explosion-proof piece (40) opens a valve to release pressure.

7. The battery according to claim 1, characterized in that There are a plurality of first blocking portions (22), and the plurality of first blocking portions (22) are arranged circumferentially around the through hole (13).

8. The battery according to any one of claims 1 to 7, characterized in that: The explosion-proof disc (40) comprises a pressure relief portion (41) and a non-pressure relief portion (42), wherein the non-pressure relief portion (42) is used to block ejected matter when the explosion-proof disc (40) opens a valve to relieve pressure.

9. The battery according to claim 8, characterized in that: Along the axial direction of the through hole (13), the orthographic projection of the non-pressure relief portion (42) and the orthographic projection of the fixing portion (21) in the through hole (13) do not overlap or partially overlap; or, When the first blocking sheet (20) includes a second blocking portion (23), along the axial direction of the through hole (13), the orthographic projection of the non-pressure relief portion (42) and the orthographic projection of the second blocking portion (23) do not overlap or partially overlap.

10. The battery according to claim 9, characterized in that Also includes: A second blocking piece (30) is installed between the explosion-proof piece (40) and the first blocking piece (20), the second blocking piece (30) being fixed relative to the shell wall and partially blocking the through hole (13); Along the axial direction of the through hole (13), the orthographic projection of the second blocking sheet (30) does not overlap or partially overlaps with the orthographic projection of the non-pressure relief portion (42).

11. The battery according to claim 9, characterized in that At least one of the non-pressure relief portion (42), the second blocking sheet (30) and the first blocking sheet (20) is provided with a plurality of air holes.

12. An electrical device, characterized in that: Comprising a battery as claimed in any one of claims 1 to 11.

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