Battery and electric device

Abstract

An electric device, comprising a battery. The battery comprises a battery case, a battery cell, an elastic sealing member and a conductive pillar. The battery case and the elastic sealing member are connected and define an accommodating cavity, and the battery cell is arranged in the accommodating cavity. A through hole which extends in a first direction and is used for communicating the outside with the accommodating cavity is formed in the elastic sealing member, one end of the conductive pillar passes through the through hole and is electrically connected to a tab of the battery cell, and the other end of the conductive pillar protrudes out of the elastic sealing member. A pressure relief portion is arranged on the elastic sealing member, and the pressure relief portion is configured to rupture when the pressure in the accommodating cavity is greater than a pressure relief threshold, so as to release the pressure in the battery.

Description

Batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to a Chinese patent application filed with the Patent Office of China on September 26, 2023, with application number 202322646894.9 and titled “Batteries and Electrical Devices,” the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0003] The present disclosure relates to the field of battery technology, and in particular, to a battery and an electrical device. Background Art

[0004] Cylindrical batteries have the advantages of good safety performance, high energy density and low internal resistance, and therefore have a wide range of applications.

[0005] In the prior art, to relieve pressure in cylindrical batteries, a cross-shaped notch is often designed on the bottom of the battery case. When the internal pressure of the battery is too high, the cross-shaped notch will break to relieve pressure. However, this method of designing a notch on the bottom of the battery is complex and reduces the strength of the bottom of the battery case.

[0006] Summary of the Invention

[0007] The purpose of the present disclosure is to provide a battery and an electrical device to solve the technical problems existing in the related art.

[0008] In order to achieve the above objectives, the present disclosure provides a battery in a first aspect, comprising:

[0009] Battery housing;

[0010] an elastic sealing member connected to the battery housing and defining a receiving cavity, the elastic sealing member being formed with a through hole extending in a first direction, the through hole being used to connect the outside and the receiving cavity, and the elastic sealing member being provided with a pressure relief portion, the pressure relief portion being configured to rupture to release pressure inside the battery when the pressure in the receiving cavity exceeds a pressure relief threshold;

[0011] A battery cell is disposed in the accommodating cavity;

[0012] A conductive column has one end passing through the through hole and electrically connected to the tab of the battery cell, and the other end protruding from the elastic seal.

[0013] Optionally, the pressure relief portion includes a pressure relief channel and a weak portion, the pressure relief channel is used to connect the outside and the accommodating cavity, the weak portion blocks the pressure relief channel, and the weak portion can rupture when the pressure in the accommodating cavity is greater than a pressure relief threshold.

[0014] Optionally, the pressure relief channel includes a first channel opening and a second channel opening, the second channel opening is close to the accommodating cavity, and the first channel opening corresponds to the second channel opening;

[0015] The weak portion is sealed at the first channel opening; and / or, the weak portion is sealed at the second channel opening; and / or, the weak portion is sealed in the pressure relief channel, and the weak portion is located between the first channel opening and the second channel opening.

[0016] Optionally, the pressure relief channel extends along the first direction, from the first channel opening to the second channel opening.

[0017] The channel diameters of the pressure relief channels along the second direction are all the same, or the channel diameters of the pressure relief channels along the second direction gradually increase, or the channel diameters of the pressure relief channels along the second direction gradually decrease;

[0018] The first direction and the second direction are perpendicular to each other.

[0019] Optionally, the weak portion is sealed at the second channel opening, the thickness of the weak portion along the first direction is between 0.1 mm and 0.3 mm, and the length of the pressure relief channel along the first direction is between 3.1 mm and 4 mm.

[0020] Optionally, the pressure relief channel extends along the first direction, and in the direction from the first channel opening to the second channel opening, the pressure relief channel includes a first channel and a second channel;

[0021] In the direction from the first channel opening to the second channel opening, the channel diameter of the first channel along the second direction gradually decreases, the channel diameter of the second channel along the second direction is the same, and the weak portion is sealed at the second channel opening;

[0022] The first direction and the second direction are perpendicular to each other.

[0023] Optionally, the pressure relief channel extends along the first direction, and in the direction from the first channel opening to the second channel opening, the pressure relief channel includes a first channel and a second channel;

[0024] In the direction from the first channel opening to the second channel opening, the channel diameter of the first channel along the second direction gradually decreases, and the channel diameter of the second channel along the second direction gradually increases, and the weak portion is provided between the first channel and the second channel, wherein the first direction and the second direction are perpendicular to each other; or,

[0025] In the direction from the first channel opening to the second channel opening, the channel diameter of the first channel along the second direction gradually increases, and the channel diameter of the second channel along the second direction gradually decreases, and the weak portion is arranged between the first channel and the second channel, wherein the first direction and the second direction are perpendicular to each other.

[0026] Optionally, a dimension of the first channel along the first direction is between 3.3 mm and 4.0 mm, and a dimension of the second channel along the first direction is between 2.8 mm and 3.2 mm.

[0027] Optionally, the pressure relief channel extends along the first direction and is spaced apart from the through hole along the second direction, and the cross-sectional shape of the pressure relief channel along the first direction is rectangular or trapezoidal; wherein the first direction and the second direction are perpendicular to each other.

[0028] In a second aspect of the present disclosure, an electrical device is further provided, wherein the electrical device includes the battery.

[0029] In the above technical solution, by providing an elastic seal with a pressure relief portion, when the gas pressure within the chamber exceeds the pressure relief threshold, the gas can break through the pressure relief portion, thereby achieving the purpose of pressure relief. This pressure relief method can avoid notching the bottom of the battery case, simplifying the process while avoiding reducing the strength of the battery case bottom. In addition, the through hole not only facilitates the passage of the conductive column, but also effectively limits the conductive column and improves its stability.

[0030] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0032] FIG1 is a schematic cross-sectional view of a battery according to an embodiment of the present disclosure.

[0033] FIG2 is a schematic cross-sectional view of an elastic seal of a battery according to a first embodiment of the present disclosure.

[0034] FIG3 is a schematic cross-sectional view of an elastic sealing member of a battery according to a second embodiment of the present disclosure.

[0035] FIG4 is a schematic cross-sectional view of an elastic seal of a battery according to a third embodiment of the present disclosure.

[0036] FIG5 is a schematic cross-sectional view of an elastic seal of a battery according to a fourth embodiment of the present disclosure.

[0037] FIG6 is a schematic cross-sectional view of an elastic seal of a battery according to a fifth embodiment of the present disclosure.

[0038] FIG7 is a schematic cross-sectional view of an elastic seal of a battery according to a sixth embodiment of the present disclosure.

[0039] FIG8 is a schematic diagram of an electrical device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0040] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0041] In this disclosure, unless otherwise stated, directional words such as "first direction, second direction" used can refer to Figure 1; terms such as "first, second" used are only to distinguish one element from another, and do not have order or importance.

[0042] 1 to 7 , the present disclosure provides a battery 1000, which includes a battery case 1, a battery cell 2, an elastic seal 3 and a conductive column 4. The battery case 1 and the elastic seal 3 are connected and define a accommodating cavity 100, and the battery cell 2 is arranged in the accommodating cavity 100; the elastic seal 3 is formed with a through hole 30 extending along a first direction A and used to connect the outside and the accommodating cavity 100, one end of the conductive column 4 is passed through the through hole 30 and is electrically connected to the tab of the battery cell 2, and the other end protrudes from the elastic seal 3; a pressure relief portion 300 is provided on the elastic seal 3, and the pressure relief portion 300 is configured to rupture when the pressure in the accommodating cavity 100 is greater than a pressure relief threshold to release the pressure inside the battery 1000.

[0043] In the above technical solution, by providing the elastic seal 3 and providing the pressure relief portion 300 on the elastic seal 3, when the gas pressure inside the battery housing 1 exceeds the pressure relief threshold, the gas can break through the pressure relief portion 300 to achieve the purpose of pressure relief. This pressure relief method can avoid scoring the bottom of the battery housing 1, simplifying the process while avoiding reducing the strength of the bottom of the battery housing 1. In addition, the through hole 30 not only facilitates the passage of the conductive pillar 4, but also effectively limits the conductive pillar 4 and improves the stability of the conductive pillar 4.

[0044] Optionally, when the battery cell 2 is a single conductive column battery cell, the corresponding through hole 30 on the elastic seal 3 can be set to one; when the battery cell 2 is a double conductive column battery cell, the corresponding through hole 30 on the elastic seal 3 can be set to two. The present disclosure does not limit the number of through holes 30.

[0045] Optionally, as shown in Figure 1, the pressure relief portion 300 includes a pressure relief channel 31 and a weak portion 310. The pressure relief channel 31 is used to connect the outside and the accommodating chamber 100. The weak portion 310 blocks the pressure relief channel 31 and can break when the pressure in the accommodating chamber 100 is greater than the pressure relief threshold.

[0046] In this embodiment, when the pressure inside the accommodating chamber 100 exceeds the pressure relief threshold, the weak portion 310 ruptures under the pressure of the gas, thereby draining the gas from the accommodating chamber 100 through the pressure relief channel 31, thereby improving safety. However, this disclosure does not limit the specific structural design of the pressure relief portion 300. In addition, the pressure relief portion 300 can be integrally formed with the elastic seal 3, that is, the pressure relief channel 31 is formed inside the elastic seal 3, and the weak portion 310 is part of the elastic seal 3. For example, the weak portion 310 can be configured as an elastic pressure relief membrane.

[0047] In an optional embodiment, referring to Figures 1 to 4, the pressure relief channel 31 includes a first channel opening 311 and a second channel opening 312, the second channel opening 312 is close to the accommodating cavity 100, and the first channel opening 311 corresponds to the second channel opening 312; the weak portion 310 is sealed at the first channel opening 311; and / or, the weak portion 310 is sealed at the second channel opening 312; and / or, the weak portion 310 is sealed in the pressure relief channel 31 and is located between the first channel opening 311 and the second channel opening 312.

[0048] That is, the present disclosure does not limit the specific location of the weak portion 310 in the pressure relief channel 31, and the weak portion 310 can be located at both ends of the pressure relief channel 31 or at any location inside the pressure relief channel 31. In addition, the present disclosure does not limit the number of weak portions 310.

[0049] For example, there is one weak portion 310, which can be located at the first channel opening 311 of the pressure relief channel 31, or at the second channel opening 312 of the pressure relief channel 31, or inside the pressure relief channel 31. Alternatively, there can be two weak portions 310, one of which is located at the first channel opening 311 or the second channel opening 312, and the other is located inside the pressure relief channel 31; or one of which is located at the first channel opening 311 and the other is located at the second channel opening 312. Alternatively, there can be three weak portions 310, two of which are located at the first channel opening 311 and the second channel opening 312, respectively, and the other is located inside the pressure relief channel 31.

[0050] In addition, for the pressure relief channel 31, the pressure relief channel 31 can be constructed into any appropriate shape. For example, the pressure relief channel 31 can be constructed as a straight channel extending along the first direction A, or a serpentine curved channel. The present disclosure does not limit this.

[0051] As shown in Figures 2 to 4 , the pressure relief channel 31 extends along a first direction A. From the first channel opening 311 to the second channel opening 312, the channel diameter of the pressure relief channel 31 along a second direction B remains constant. Alternatively, the channel diameter of the pressure relief channel 31 along the second direction B gradually increases, or the channel diameter of the pressure relief channel 31 along the second direction B gradually decreases. The first direction A and the second direction B are perpendicular to each other. In other words, the present disclosure does not limit the channel diameter of the pressure relief channel 31 along the second direction B; it only requires that the channel diameter meets the pressure relief requirements of the battery 1000.

[0052] In another embodiment, as shown in FIG3 , the weak portion 310 is sealed at the second channel opening 312 , the thickness of the weak portion 310 along the first direction A is between 0.1 mm and 0.3 mm, and the length of the pressure relief channel 31 along the first direction A is between 3.1 mm and 4 mm.

[0053] The specific thickness of the weak portion 310 can be set according to the specific requirements of the pressure relief of the battery 1000. When the above-mentioned pressure relief threshold is large, the thickness of the weak portion 310 can be set thicker. When the above-mentioned pressure relief threshold is small, the thickness of the weak portion 310 can be set thinner. The present disclosure does not limit the specific thickness of the weak portion 310.

[0054] Alternatively, as shown in FIG5 , the pressure relief channel 31 extends along a first direction A. From the first channel opening 311 to the second channel opening 312, the pressure relief channel 31 includes a first channel 313 and a second channel 314. From the first channel opening 311 to the second channel opening 312, the channel diameter of the first channel 313 gradually decreases along the second direction B, while the channel diameter of the second channel 314 remains the same along the second direction B. The weak portion 310 is sealed at the second channel opening 312. The first direction A and the second direction B are perpendicular to each other. That is, with respect to the channel diameter of the pressure relief channel 31 along the second direction B, the channel diameter of the first channel 313 along the second direction B may also gradually decrease, while the channel diameter of the second channel 314 along the second direction B remains the same. This is not limited in the present disclosure.

[0055] As shown in FIG6 , the pressure relief channel 31 extends along a first direction A. From the first channel opening 311 to the second channel opening 312, the pressure relief channel 31 includes a first channel 313 and a second channel 314. From the first channel opening 311 to the second channel opening 312, the channel diameter of the first channel 313 gradually decreases along the second direction B, while the channel diameter of the second channel 314 gradually increases along the second direction B. The weak portion 310 is disposed between the first channel 313 and the second channel 314, wherein the first direction A and the second direction B are perpendicular to each other. That is, when the weak portion 310 is disposed within the pressure relief channel 31, the channel diameters of the first channel 313 and the second channel 314 on either side of the weak portion 310 may both gradually change. However, this disclosure does not limit the specific shape of the pressure relief channel 31.

[0056] As shown in FIG6 , the dimension of the first channel 313 along the first direction A is between 3.3 mm and 4.0 mm, and the dimension of the second channel 314 along the first direction A is between 2.8 mm and 3.2 mm. For example, the dimension of the first channel 313 along the first direction A can be 3.3 mm, 4.0 mm, or 3.8 mm, and this disclosure does not limit the specific dimension of the first channel 313 along the first direction A. The dimension of the second channel 314 along the first direction A can be 2.8 mm, 3.2 mm, or 2.9 mm, and this disclosure does not limit the specific dimension of the second channel 314 along the first direction A.

[0057] Alternatively, in another embodiment, as shown in Figure 7, in the direction from the first channel opening 311 to the second channel opening 312, the channel diameter of the first channel 313 along the second direction B gradually increases, and the channel diameter of the second channel 314 along the second direction B gradually decreases, and the weak portion 310 is arranged between the first channel 313 and the second channel 314, wherein the first direction A and the second direction B are perpendicular to each other.

[0058] Optionally, the elastic seal 3 is configured as an elastic plugging cover. This elastic plugging cover can be constructed as an integrally molded structure, that is, the aforementioned weak portion 310 is integrally molded on the elastic seal 3. Furthermore, the elastic seal 3 and the weak portion 310 can be made of rubber, but this disclosure does not limit the specific materials of the elastic seal 3 and the weak portion 310. Furthermore, the elastic plugging cover can be sealed to the battery housing 1 using a rolling groove sealing device, thereby improving the sealing performance of the connection.

[0059] Optionally, as shown in Figure 1, the pressure relief channel 31 extends along the first direction A and is spaced apart from the through hole 30 along the second direction B, and the cross-sectional shape of the pressure relief channel 31 along the first direction A is constructed as a rectangle or a trapezoid; however, the present disclosure does not limit the cross-sectional shape of the pressure relief channel 31 along the first direction A.

[0060] In addition, the battery 1000 may be configured as a cylindrical battery, but the present disclosure does not limit the specific type of the battery 1000 .

[0061] In addition, the assembly steps of the battery 1000 can be referred to as follows:

[0062] 1) The elastic seal 3 is sleeved on the battery cell 2, and the elastic seal 3 and the battery cell 2 are positioned by the sleeve cooperation of the battery cell guide pin 22 and the through hole 30, and manual fine-tuning can be performed;

[0063] 2) Soak the battery cell 2 in electrolyte and place it into the battery housing 1;

[0064] 3) Use a rolling groove sealing device to seal the elastic seal 3 and the battery housing 1.

[0065] 8 , the present disclosure further provides an electric device 2000, which includes the battery 1000 described above. However, the present disclosure does not limit the type of the electric device 2000. For example, the electric device 2000 may be a vehicle, a mobile phone, a portable device, a laptop computer, an electric toy, an electric tool, a drone, a lighting device, etc. The vehicle may be a fuel vehicle, a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc.

[0066] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0067] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0068] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A battery (1000), characterized in that: The battery (1000) comprises: Battery housing (1); An elastic sealing member (3) is connected to the battery housing (1) and defines a receiving chamber (100), the elastic sealing member (3) is formed with a through hole (30) extending along a first direction (A), the through hole (30) is used to connect the outside and the receiving chamber (100), and the elastic sealing member (3) is provided with a pressure relief portion (300), the pressure relief portion (300) is configured to be able to rupture when the pressure in the receiving chamber (100) is greater than a pressure relief threshold to release the pressure inside the battery (1000); A battery cell (2) is arranged in the accommodating cavity (100); A conductive column (4) has one end that passes through the through hole (30) and is electrically connected to the tab of the battery cell (2), and the other end that protrudes from the elastic sealing component (3).

2. The battery (1000) according to claim 1, characterized in that: The pressure relief portion (300) comprises a pressure relief channel (31) and a weak portion (310); the pressure relief channel (31) is used to connect the outside and the accommodating chamber (100); the weak portion (310) blocks the pressure relief channel (31), and the weak portion (310) can be broken when the pressure in the accommodating chamber (100) is greater than a pressure relief threshold.

3. The battery (1000) according to claim 2, characterized in that: The pressure relief channel (31) comprises a first channel opening (311) and a second channel opening (312), wherein the second channel opening (312) is close to the accommodating chamber (100), and the first channel opening (311) corresponds to the second channel opening (312); The weak portion (310) is sealed at the first channel opening (311); and / or the weak portion (310) is sealed at the second channel opening (312); and / or the weak portion (310) is sealed in the pressure relief channel (31), and the weak portion (310) is located between the first channel opening (311) and the second channel opening (312).

4. The battery (1000) according to claim 3, characterized in that: The pressure relief channel (31) extends along the first direction (A), from the first channel opening (311) to the second channel opening (312), The channel diameters of the pressure relief channel (31) along the second direction (B) are all the same, or the channel diameters of the pressure relief channel (31) along the second direction (B) gradually increase, or the channel diameters of the pressure relief channel (31) along the second direction (B) gradually decrease; Wherein, the first direction (A) and the second direction (B) are perpendicular to each other.

5. The battery (1000) according to claim 4, characterized in that: The weak portion (310) is sealed at the second channel opening (312), the thickness of the weak portion (310) along the first direction (A) is between 0.1 mm and 0.3 mm, and the length of the pressure relief channel (31) along the first direction (A) is between 3.1 mm and 4 mm.

6. The battery (1000) according to any one of claims 3 to 5, characterized in that: The pressure relief channel (31) extends along the first direction (A), and in the direction from the first channel opening (311) to the second channel opening (312), the pressure relief channel (31) comprises a first channel (313) and a second channel (314); In the direction from the first channel opening (311) to the second channel opening (312), the channel diameter of the first channel (313) along the second direction (B) gradually decreases, the channel diameter of the second channel (314) along the second direction (B) is the same, and the weak portion (310) is sealed and arranged at the second channel opening (312); Wherein, the first direction (A) and the second direction (B) are perpendicular to each other.

7. The battery (1000) according to any one of claims 3 to 6, characterized in that: The pressure relief channel (31) extends along the first direction (A), and in the direction from the first channel opening (311) to the second channel opening (312), the pressure relief channel (31) comprises a first channel (313) and a second channel (314); In the direction from the first channel opening (311) to the second channel opening (312), the channel diameter of the first channel (313) along the second direction (B) gradually decreases, and the channel diameter of the second channel (314) along the second direction (B) gradually increases, and the weak portion (310) is arranged between the first channel (313) and the second channel (314), wherein the first direction (A) and the second direction (B) are perpendicular to each other; or, In the direction from the first channel opening (311) to the second channel opening (312), the channel diameter of the first channel (313) along the second direction (B) gradually increases, and the channel diameter of the second channel (314) along the second direction (B) gradually decreases, and the weak portion (310) is arranged between the first channel (313) and the second channel (314), wherein the first direction (A) and the second direction (B) are perpendicular to each other.

8. The battery (1000) according to claim 7, characterized in that: The size of the first channel (313) along the first direction (A) is between 3.3 mm and 4.0 mm, and the size of the second channel (314) along the first direction (A) is between 2.8 mm and 3.2 mm.

9. The battery (1000) according to any one of claims 2 to 8, characterized in that: The pressure relief channel (31) extends along the first direction (A) and is spaced apart from the through hole (30) along the second direction (B), and the cross-sectional shape of the pressure relief channel (31) along the first direction (A) is rectangular or trapezoidal; wherein the first direction (A) and the second direction (B) are perpendicular to each other.

10. An electrical device (2000), characterized in that: The electrical device (2000) comprises the battery (1000) according to any one of claims 1 to 9.

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