Battery and electrical device

Abstract

A battery (1000), comprising a metal case (100) and a battery cell assembly (200). The battery cell assembly (200) is accommodated in the metal case (100), and the battery cell assembly (200) comprises a first tab (220) and a battery cell body (230) which are electrically connected to each other. The first tab (220) fits against an inner surface of the metal case (100) and is welded to the metal case (100).

Description

Batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on February 29, 2024, with application number 202420395164.8 and titled “Batteries and Electrical Equipment,” the entire contents of which are incorporated herein by reference. 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] A battery is generally formed by placing a cell in a shell, and the tabs are led out from the cell to provide positive and negative poles. In related technologies, the shell is given an inward-retracted structure by rolling grooves on the outer periphery of the battery shell, so that the retracted part can be connected to the tabs. However, the connection between the shell and the tabs in this way is relatively weak, resulting in large fluctuations in the resistance value of the battery's drop internal resistance, which affects the battery's performance. Summary of the Invention

[0005] The present disclosure aims to provide a battery and an electric device to at least partially solve the problems existing in the related art.

[0006] In order to achieve the above-mentioned objectives, the present disclosure provides a battery, comprising: a metal shell; and a battery cell assembly, which is accommodated in the metal shell and includes an electrically connected first pole tab and a battery cell body, wherein the first pole tab is adhered to the inner surface of the metal shell and welded to the metal shell.

[0007] Optionally, the battery includes a seal, the seal covers the opening of the metal shell, and the first tab is clamped between the outer wall of the seal and the inner wall of the metal shell.

[0008] Optionally, the metal shell and the sealing member are both formed with a recessed portion that is concave inwardly along the circumferential outer side of the battery.

[0009] Optionally, the battery includes a second tab and a guide pin, the seal is provided with a through hole, one end of the guide pin is electrically connected to the second tab, and the other end extends to the outside of the metal shell through the through hole.

[0010] Optionally, the battery includes a pressure relief valve, and the pressure relief valve is disposed through the sealing member.

[0011] Optionally, an upper edge of the first electrode tab is lower than an upper edge of the sealing member.

[0012] Optionally, the welding point between the metal shell and the first electrode tab is not lower than the lower edge of the seal.

[0013] Optionally, the upper edge of the first tab is not lower than the welding point. Optionally, the distance from the upper edge of the metal shell to the upper edge of the first tab ranges from 1.0 mm to 1.5 mm; the distance from the upper edge of the metal shell to the uppermost welding point ranges from 1.5 mm to 2.2 mm.

[0014] Optionally, the diameter of the welding point is 0.4 mm to 0.7 mm.

[0015] Optionally, a plurality of welding points are provided between the first electrode tab and the metal shell, and the plurality of welding points are arranged at intervals along a first direction and / or a second direction, the first direction is the extension direction of the first electrode tab, and the second direction is the circumferential direction of the battery.

[0016] Optionally, the number of the welding points is at least three.

[0017] Optionally, the distance between two adjacent welding points is 0.1 mm to 0.2 mm.

[0018] According to a second aspect of the embodiments of the present disclosure, there is provided an electrical device comprising the battery described in any one of the above embodiments.

[0019] The technical solutions provided by the embodiments of the present disclosure may have the following beneficial effects:

[0020] The first tab is electrically connected to the battery cell body and is attached to the inner wall of the metal shell. The metal shell is welded to the first tab, so the connection between the metal shell and the first tab is relatively firm, so that the resistance value of the drop internal resistance measured in the drop test of the battery fluctuates less, thereby ensuring the performance of the battery.

[0021] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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:

[0023] FIG1 is a schematic diagram of a battery according to an exemplary embodiment of the present disclosure.

[0024] FIG2 is a cross-sectional view of a battery according to an exemplary embodiment of the present disclosure.

[0025] FIG3 is a partial enlarged schematic diagram of portion A in FIG2 .

[0026] FIG4 is a first schematic diagram showing a partial structure of a battery according to an exemplary embodiment of the present disclosure.

[0027] FIG5 is a second schematic diagram showing a partial structure of a battery according to an exemplary embodiment of the present disclosure.

[0028] FIG6 is a third schematic diagram showing a partial structure of a battery according to an exemplary embodiment of the present disclosure.

[0029] FIG. 7 is a schematic diagram of a battery according to another exemplary embodiment of the present disclosure.

[0030] FIG8 is a schematic diagram showing an electric device according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0031] 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.

[0032] In this disclosure, unless otherwise indicated, directional terms such as "upper, lower, and vertical" are defined for ease of description. For specific reference, please refer to the drawing directions of Figures 1 through 7. "Inner" and "outer" are defined based on the inherent contours of the corresponding components. Terms such as "first" and "second" used in this disclosure are intended to distinguish one element from another and do not convey sequential or significant meaning. Furthermore, when the following description refers to the accompanying drawings, unless otherwise indicated, identical numbers in different drawings represent identical or similar elements.

[0033] Referring to Figures 1 to 7, a battery 1000 provided in an embodiment of the present disclosure may include a metal shell 100 and a cell assembly 200. The cell assembly 200 may be housed within the metal shell 100 and include an electrically connected first tab 220 and a cell body 230. Referring to Figure 3, the first tab 220 is adhered to the inner surface of the metal shell 100 and welded to the metal shell 100 so that the first tab 220 can be electrically connected to the metal shell 100, thereby enabling the metal shell 100 to constitute one of the positive and negative electrodes of the battery 1000, and the other of the positive and negative electrodes can be led out of the metal shell 100 in a manner insulated from the metal shell 100.

[0034] It is understood that the first tab 220 is electrically connected to the cell body 230 and attached to the inner wall of the metal housing 100. The metal housing 100 and the first tab 220 are welded together. This provides a relatively secure connection between the metal housing 100 and the first tab 220, minimizing fluctuations in the drop resistance measured during the battery drop test and ensuring battery performance. Furthermore, the metal housing 100 can serve as a terminal for connection to other electrical components, simplifying the battery structure.

[0035] In this embodiment, the battery may be a capacitor battery or other types of cylindrical batteries, which is not limited in this disclosure.

[0036] In one embodiment, referring to Figures 2 to 6 , the battery 1000 may further include a seal 400, which may be a rubber seal. The seal 400 may cover the opening of the metal shell 100, and the first tab 220 may be clamped between the outer wall of the seal 400 and the inner wall of the metal shell 100. The seal 400 can ensure a sealing effect inside the metal shell 100, and the seal 400 can also provide a certain pressing force for the first tab 220 to fit the metal shell 100, thereby improving the connection effect between the first tab 220 and the metal shell 100.

[0037] Furthermore, referring to Figures 1 and 7 , both the metal housing 100 and the seal 400 may be formed with a recess 120 that is concave inwardly along the circumferential outer side of the battery. When the battery is cylindrical, the inward concave direction of the battery is the radial direction of the battery. The recess 120 may be formed by rolling the recess 120 onto the metal housing 100 after the seal 400 is placed into the metal housing 100, thereby simultaneously forming the recess 120 on the seal 400. In this state, the seal 400 can be limited in position in the direction of the opening of the metal housing 100, and the sealing effect can also be enhanced.

[0038] It should be explained that FIG. 2 to FIG. 6 show the structure of the metal shell 100 before the concave portion 120 is rolled out, and FIG. 1 and FIG. 7 show the structure of the metal shell 100 after the concave portion 120 is rolled out.

[0039] In the disclosed embodiment, the connection area between the metal housing 100 and the first tab 220 can be located in the recess 120, further ensuring that the first tab 220 is in close contact with the metal housing 100. As a result, the connection between the metal housing 100 and the first tab 220 is more secure, resulting in less fluctuation in the drop internal resistance of the battery 1000 measured in a drop test, thereby ensuring the battery's performance.

[0040] 2 , the metal shell 100 may include a shell body 130 and a flange 140 connected to the shell body 130. The flange 140 is located at the opening edge of the metal shell 100. After the seal 400 is covered at the opening of the metal shell 100, a sealing device is used to bend the flange 140 inward to cover the circumference of the upper surface of the seal 400 to limit the seal 400 from going out of the metal shell 100. As shown in FIG6 , a schematic diagram of the flange 140 after being bent inward is shown.

[0041] In one embodiment, the battery 1000 further includes an electrolyte. The electrolyte may be located in the metal shell 100 and below the recess 120 of the metal shell 100 .

[0042] In one embodiment, referring to FIG. 2 , the battery 1000 may include a second tab 240 and a guide pin 300. The seal 400 may be provided with a through hole 410. One end of the guide pin 300 may be electrically connected to the second tab 240, and the other end may extend outside the metal housing 100 through the through hole 410. An electrical device may be connected to the guide pin 300 and the metal housing 100 to receive the current and voltage within the battery 1000.

[0043] One of the first tab 220 and the second tab 240 is a positive tab, and the other is a negative tab. For example, if the first tab 220 is a positive tab and the second tab 240 is a negative tab, the metal housing 100 is the positive electrode of the battery 1000, and the guide pin 300 is the negative electrode of the battery 1000. If the first tab 220 is a negative tab and the second tab 240 is a positive tab, the metal housing 100 is the negative electrode of the battery 1000, and the guide pin 300 is the positive electrode of the battery 1000.

[0044] In one embodiment, referring to Figures 2, 4 and 5, the battery 1000 may include a pressure relief valve 500, which may be provided through the seal 400. When the battery 1000 is in a normal state, the pressure relief valve 500 is in a closed state; when the internal pressure of the battery 1000 is too high, the pressure relief valve 500 is in an open state to prevent the battery 1000 from exploding due to excessive pressure.

[0045] In one embodiment, referring to Figures 2 to 5 , the upper edge of the first tab 220 can be set lower than the upper edge of the seal 400. This ensures that the first tab 220 does not extend out of the seal 400, thereby ensuring the sealing effect of the battery 1000.

[0046] 2 to 5 , the welding point 111 between the metal housing 100 and the first tab 220 may be set no lower than the bottom edge of the seal 400 to avoid leakage of electrolyte below the seal 400 due to the welding point 111 being too low.

[0047] Furthermore, the upper edge of the first pole tab 220 is not lower than the welding point 111, so that the upper edge of the first pole tab 220 can "reach" the uppermost welding point of the metal shell 100, ensuring that the two can be effectively welded, thereby ensuring that the connection between the two is more secure, so that the resistance value of the drop internal resistance measured by the battery 1000 in the drop test fluctuates less, thereby ensuring the performance of the battery.

[0048] Furthermore, referring to FIG4 , the distance from the upper edge of the metal shell 100 to the upper edge of the first tab 220 can be represented by A. The value of A can range from 1.0 mm to 1.5 mm. In this case, the upper edge of the first tab 220 can be located at the seal 400. When a recess 120 is provided, the upper edge of the first tab 220 can be located at the recess 120. For example, the value of A can be 1.0 mm, 1.2 mm, 1.4 mm, or 1.5 mm.

[0049] In the disclosed embodiment, when A is in the range of 1.0 mm to 1.5 mm, the upper edge of the first tab 220 is located within the recess 120. If A is less than 1 mm, the first tab 220 will extend beyond the seal 400, affecting the battery's sealing performance. If A is greater than 1.5 mm, the upper edge of the first tab 220 will not be able to reach the weld point 111 of the metal housing 100 corresponding to the seal 400, resulting in a poor connection between the metal housing 100 and the first tab 220.

[0050] Referring to Figures 1, 5, and 7, the distance from the upper edge of the metal housing 100 to the uppermost weld point 111 can be represented by B, and the value of B can range from 1.5 mm to 2.2 mm. In this case, the uppermost weld point 111 of the metal housing 100 can be located on the seal 400. If a recess 120 is provided, it can be located in the recess 120. For example, the value of B can be 1.5 mm, 1.7 mm, 1.9 mm, 2.1 mm, or 2.2 mm.

[0051] When B is in the range of 1.5 mm to 2.2 mm, the uppermost weld point 111 of the metal shell 100 is located on the seal 400. If B is less than 1.5 mm, the weld point 111 of the metal shell 100 is above the seal 400 and cannot contact the upper edge of the first tab 220 in the recess 120. If B is greater than 2.2 mm, the uppermost weld point 111 of the metal shell 100 is below the seal 400. If the metal shell 100 and the first tab 220 are "welded" due to defocusing or other reasons, the electrolyte will directly seep out, affecting the sealing performance of the battery.

[0052] In this embodiment, based on the settings of the above-mentioned dimensions A and B, the diameter of the welding point 111 can be 0.4 mm to 0.7 mm. For example, the diameter of the welding point 111 can be 0.4 mm, 0.5 mm, 0.6 mm, or 0.7 mm. If the diameter of the welding point 111 is too large, the laser welding will be defocused (i.e., two adjacent welding points 111 will stick together, and the electrolyte will seep out); if the diameter of the welding point 111 is too small, the metal shell 100 and the first tab 220 will not be firmly welded, resulting in a large fluctuation in the resistance value of the drop internal resistance.

[0053] In one embodiment, referring to Figures 1 to 7 , a plurality of welding points 111 may be provided between the first tab 220 and the metal shell 100. The plurality of welding points 111 may be spaced apart along a first direction and / or a second direction. As shown in Figure 2 , the first direction may be the extension direction of the first tab 220, and the second direction may be the circumferential direction of the battery. When the battery 1000 is cylindrical, the first direction may be the axial direction of the battery 1000, and the second direction may be the circumferential direction of the battery 1000. The plurality of welding points 111 are provided to ensure a stable weld connection between the first tab 220 and the metal shell 100, thereby minimizing fluctuations in the drop internal resistance of the battery 1000 measured during a drop test, thereby ensuring the performance of the battery 1000.

[0054] Furthermore, the number of welding points 111 is at least three, for example, the number of welding points 111 can be three, four, five or six, which is not specifically limited here. If the number of welding points 111 is too small, the first tab 220 cannot be firmly welded to the metal shell 100.

[0055] In some embodiments, the number of welding points 111 can be set to no more than six. If the number of welding points 111 is too large, an area will be welded multiple times and will be "leaked", affecting the sealing performance and use effect of the battery.

[0056] For example, when there are three welding points 111 , the plurality of welding points 111 may be arranged at intervals only along the first direction, or may be arranged at intervals only along the second direction, or may be arranged in a triangle.

[0057] For example, when there are six welding points 111, two distribution arrangements are possible. In one embodiment, referring to Figures 1 and 2, the six welding points 111 can be arranged in three rows and two columns, with each row having two welding points 111 along the second direction and each column having three welding points 111 along the first direction. In another embodiment, referring to Figure 7, the six welding points 111 can be arranged in two rows and three columns, with each row having three welding points 111 along the second direction and each column having two welding points 111 along the first direction.

[0058] In this embodiment, the distance between two adjacent welding points 111 can be 0.1 mm to 0.2 mm. For example, the distance between two adjacent welding points 111 can be 0.1 mm, 0.15 mm, or 0.2 mm, without specific limitation. If the distance is too close, the adjacent welding points 111 will stick together, and electrolyte will leak out. If the distance between adjacent welding points 111 is too far, the stability of the welded connection between the metal housing 100 and the first tab 220 will be affected.

[0059] Referring to Figures 1 to 7, the production of a battery may include the following steps and methods:

[0060] S910 , the first tab 220 is welded to the cell body 230 using ultrasonic welding.

[0061] S930 , using a winding machine to wind the battery cell body 230 into a battery cell.

[0062] S950. Place the battery cell into the metal shell 100. After the battery cell is in the shell, place it into the fixture. After entering the shell, the first tab 220 contacts the metal shell 100. Use welding equipment to weld the metal shell 100 and the first tab 220 to fix them. The welding tension is 18 to 25N, the welding equipment power is 500W, the welding speed is 400s / m, the weld width is 0.55mm, and the weld depth is 0.11mm.

[0063] S970 , insert the sealing member 400 and seal the battery 1000 using a sealing machine.

[0064] The battery 1000 of this embodiment was subjected to a drop test when fully charged, and the measured drop internal resistance was below 80 mΩ. The fluctuation range of the drop internal resistance measured in multiple tests was small, ensuring the performance of the battery.

[0065] According to a second aspect of an embodiment of the present disclosure, referring to FIG8 , an electric device 2000 is provided, which may include the battery 1000 of any one of the above embodiments and have all the beneficial effects of the above batteries, which will not be described in detail here.

[0066] The present disclosure does not limit the type of electrical equipment. For example, it can be a vehicle, mobile phone, portable device, laptop computer, electric toy, power tool, drone, lighting equipment, etc. The vehicle can be a fuel vehicle, a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc.

[0067] 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.

[0068] 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.

[0069] 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: include: Metal housing (100); as well as The battery cell assembly (200) is accommodated in the metal shell (100) and comprises an electrically connected first pole tab (220) and a battery cell body (230); the first pole tab (220) is arranged on the inner surface of the metal shell (100) and is welded to the metal shell (100).

2. The battery (1000) according to claim 1, characterized in that The battery (1000) includes a sealing member (400) which covers the opening of the metal shell (100), and the first tab (220) is clamped between the outer wall of the sealing member (400) and the inner wall of the metal shell (100).

3. The battery (1000) according to claim 2, characterized in that The metal shell (100) and the sealing member (400) are both formed with a recessed portion (120) that is recessed inwardly along the circumferential outer side of the battery (1000).

4. The battery (1000) according to claim 2 or 3, characterized in that The battery (1000) includes a second pole tab (240) and a guide pin (300), the seal (400) is provided with a through hole (410), one end of the guide pin (300) is electrically connected to the second pole tab (240), and the other end extends to the outside of the metal shell (100) through the through hole (410).

5. The battery (1000) according to any one of claims 2 to 4, characterized in that The battery (1000) includes a pressure relief valve (500), and the pressure relief valve (500) is disposed through the sealing member (400).

6. The battery (1000) according to any one of claims 2 to 5, characterized in that The upper edge of the first electrode tab (220) is lower than the upper edge of the sealing member (400).

7. The battery (1000) according to any one of claims 2 to 6, characterized in that The welding point (111) between the metal shell (100) and the first tab (220) is not lower than the lower edge of the sealing member (400).

8. The battery (1000) according to claim 7, characterized in that The upper edge of the first electrode tab (220) is not lower than the welding point (111).

9. The battery (1000) according to any one of claims 6 to 8, characterized in that The distance between the upper edge of the metal shell (100) and the upper edge of the first tab (220) ranges from 1.0 mm to 1.5 mm; The distance from the upper edge of the metal shell (100) to the uppermost welding point (111) ranges from 1.5 mm to 2.2 mm.

10. The battery (1000) according to claim 9, characterized in that The diameter of the welding point (111) is 0.4 mm to 0.7 mm.

11. The battery (1000) according to any one of claims 1 to 10, characterized in that A plurality of welding points (111) are provided between the first pole tab (220) and the metal shell (100), and the plurality of welding points (111) are arranged at intervals along a first direction and / or a second direction, the first direction being the extension direction of the first pole tab (220), and the second direction being the circumferential direction of the battery (1000).

12. The battery (1000) according to claim 11, characterized in that The number of the welding points (111) is at least three.

13. The battery (1000) according to claim 12, characterized in that The distance between two adjacent welding points (111) is 0.1 mm to 0.2 mm.

14. An electrical device (2000), characterized in that: A battery (1000) comprising the battery according to any one of claims 1 to 13.

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