Battery and electric equipment

Abstract

The utility model relates to a battery and electric equipment. The battery comprises a metal shell; the battery cell assembly is accommodated in the metal shell and comprises a first tab and a battery cell body which are electrically connected, and the first tab is arranged on the inner surface of the metal shell in an attached mode and welded to the metal shell. The first tab is electrically connected with the battery cell body and is attached to the inner wall of the metal shell, and the metal shell is connected with the first tab in a welding manner, so that the metal shell and the first tab are firmly connected, the resistance value fluctuation of the drop internal resistance measured in a drop test of the battery is small, and the use performance of the battery is ensured.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular, to a battery and an electrical device. Background Art

[0002] A battery is generally formed by placing a cell in a shell, and tabs are led out from the cell to provide positive and negative electrodes. In the related art, a groove is rolled out on the outer periphery of the battery shell to make the shell have an inward-retracted structure so that the inward-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, affecting the battery's performance. Utility Model Content

[0003] The purpose of the present disclosure is to provide a battery and an electric device to at least partially solve the problems existing in the related art.

[0004] 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 ear and a battery cell body, wherein the first pole ear is fitted on the inner surface of the metal shell and welded to the metal shell.

[0005] Optionally, the battery includes a seal, the seal covers the opening of the metal shell, and the first electrode tab is clamped between the outer wall of the seal and the inner wall of the metal shell.

[0006] Optionally, the metal shell and the seal are both formed with a recessed portion that is recessed inwardly along the circumferential outer side of the battery.

[0007] Optionally, the battery includes a second pole 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 pole tab, and the other end extends to the outside of the metal shell through the through hole.

[0008] Optionally, the battery includes a pressure relief valve, and the pressure relief valve is disposed through the sealing member.

[0009] Optionally, an upper edge of the first electrode tab is lower than an upper edge of the sealing member.

[0010] Optionally, a welding point between the metal shell and the first pole tab is not lower than a lower edge of the seal.

[0011] Optionally, the upper edge of the first pole lug 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 pole lug 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.

[0012] Optionally, the diameter of the welding point is 0.4 mm to 0.7 mm.

[0013] Optionally, a plurality of welding points are provided between the first pole lug 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 an extension direction of the first pole lug, and the second direction is a circumferential direction of the battery.

[0014] Optionally, the number of the welding points is at least three.

[0015] Optionally, the distance between two adjacent welding points is 0.1 mm to 0.2 mm.

[0016] According to a second aspect of the embodiments of the present disclosure, there is provided an electrical device comprising a battery as described in any one of the above embodiments.

[0017] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0018] The first pole ear 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 pole ear, so the connection between the metal shell and the first pole ear is relatively firm, so that the resistance value fluctuation of the drop internal resistance measured in the drop test of the battery is small, thereby ensuring the performance of the battery.

[0019] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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 specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0021] Figure 1 is a schematic diagram of a battery according to an exemplary embodiment of the present disclosure.

[0022] Figure 2 is a cross-sectional view of a battery according to an exemplary embodiment of the present disclosure.

[0023] Figure 3 yes Figure 2 A partial enlarged schematic diagram of part A in the middle.

[0024] Figure 4 is a schematic diagram of a partial structure of a battery according to an exemplary embodiment of the present disclosure Figure 1 .

[0025] Figure 5 is a schematic diagram of a partial structure of a battery according to an exemplary embodiment of the present disclosure Figure 2 .

[0026] Figure 6 is a schematic diagram of a battery according to another exemplary embodiment of the present disclosure.

[0027] Description of Reference Numerals

[0028] 100, metal shell; 111, welding point; 120, recess; 130, shell body; 140, flange; 200, battery cell assembly; 220, first pole ear; 230, battery cell body; 300, guide pin; 400, seal; 410, through hole; 500, pressure relief valve. DETAILED DESCRIPTION

[0029] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0030] In this disclosure, unless otherwise stated, directional words such as "upper, lower, vertical" are used for the purpose of convenience. Figure 2 , Figure 4 and Figure 5 The directions of the drawings, "inside" and "outside" are defined according to the outlines of the corresponding parts. The terms used in this disclosure, such as "first" and "second", are used to distinguish one element from another and do not have order and importance. In addition, when the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0031] See also Figures 1 to 6 A battery provided by an embodiment of the present disclosure may include a metal shell 100 and a battery cell assembly 200. The battery cell assembly 200 may be accommodated in the metal shell 100, and includes an electrically connected first pole ear 220 and a battery cell body 230, the first pole ear 220 is arranged on the inner surface of the metal shell 100, and is welded to the metal shell 100, so that the first pole ear 220 can be conductively connected to the metal shell 100, so that the metal shell 100 constitutes one of the positive and negative electrodes of the battery, and the other of the positive and negative electrodes can be led out of the metal shell 100 in a manner of insulation from the metal shell 100.

[0032] It can be understood that the first pole tab 220 is electrically connected to the battery body 230 and is attached to the inner wall of the metal shell 100. The metal shell 100 is welded to the first pole tab 220, so the connection between the metal shell 100 and the first pole tab 220 is relatively firm, so that the resistance value of the drop internal resistance measured in the drop test of the battery fluctuates less, ensuring the performance of the battery. In addition, the metal shell 100 can be connected to other electrical appliances as a pole, simplifying the structure of the battery.

[0033] In this embodiment, the battery may be a capacitor battery or other types of cylindrical batteries, which is not limited in the present disclosure.

[0034] In one embodiment, see Figures 2 to 5 The battery 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 pole ear 220 may be clamped between the outer wall of the seal 400 and the inner wall of the metal shell 100. The seal 400 may ensure the sealing effect inside the metal shell 100, and the seal 400 may also provide a certain pressing force for the first pole ear 220 to fit the metal shell 100, so that the connection effect between the first pole ear 220 and the metal shell 100 is better.

[0035] For further information, see Figure 1 and Figure 6 , the metal shell 100 and the seal 400 may both be formed with a recess 120 that is concave inwardly along the circumferential outer side of the battery. When the battery is cylindrical, the direction in which the battery is concave inwardly is the radial direction of the battery, and the recess 120 may be formed by rolling out the recess 120 on the metal shell 100 after the seal 400 is placed in the metal shell 100, so that the seal 400 forms the recess 120 simultaneously, and the seal 400 in this state may be limited in the direction of the opening in and out of the metal shell 100, and the sealing effect may also be enhanced.

[0036] It needs to be explained that Figures 2 to 5 This is the structure before the metal shell 100 is rolled out to form the concave portion 120. Figure 1 and Figure 6 The metal shell 100 is rolled to form a concave portion 120 .

[0037] In the embodiment of the present disclosure, the area where the metal shell 100 and the first pole tab 220 are connected can be located at the recess 120, which can further ensure that the first pole tab 220 can be in close contact with the metal shell 100. Therefore, the connection between the metal shell 100 and the first pole tab 220 is more secure, 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.

[0038] Reference Figure 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.

[0039] In one embodiment, the battery further includes an electrolyte, and the electrolyte may be located in the metal shell 100 and below the recess 120 of the metal shell 100 .

[0040] In one embodiment, see Figures 1 to 6 The battery may include a second pole tab 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 pole tab, and the other end may extend to the outside of the metal shell 100 through the through hole 410. The electrical device may be connected to the guide pin 300 and the metal shell 100 to receive the current and voltage in the battery.

[0041] One of the first pole tab 220 and the second pole tab is a positive pole tab, and the other is a negative pole tab. For example, if the first pole tab 220 is a positive pole tab and the second pole tab is a negative pole tab, the metal shell 100 is the positive pole of the battery, and the guide pin 300 is the negative pole of the battery. If the first pole tab 220 is a negative pole tab and the second pole tab is a positive pole tab, the metal shell 100 is the negative pole of the battery, and the guide pin 300 is the positive pole of the battery.

[0042] In one embodiment, see Figure 2 , Figure 4 and Figure 5 The battery may include a pressure relief valve 500, which may be disposed through the seal 400. When the battery is in a normal state, the pressure relief valve is in a closed state; when the internal pressure of the battery is too high, the pressure relief valve is in an open state to prevent the battery from exploding due to excessive pressure.

[0043] In one embodiment, see Figures 2 to 5 , the upper edge of the first pole tab 220 can be set to be lower than the upper edge of the sealing member 400. This ensures that the first pole tab 220 does not extend out of the sealing member 400, thereby ensuring the sealing effect of the battery.

[0044] In one embodiment, see Figures 2 to 5 The welding point 111 between the metal shell 100 and the first electrode tab 220 can be set to be no lower than the lower edge of the sealing member 400. This prevents the electrolyte disposed below the sealing member 400 from overflowing due to welding leakage caused by the welding point 111 being too low.

[0045] Furthermore, the upper edge of the first pole ear 220 is not lower than the welding point 111, so that the upper edge of the first pole ear 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 in the drop test of the battery fluctuates less, thereby ensuring the performance of the battery.

[0046] Further, please combine Figure 4, the distance from the upper edge of the metal shell 100 to the upper edge of the first pole tab 220 can be represented by A, and the value range of A can be 1.0 mm to 1.5 mm. At this time, the upper edge of the first pole tab 220 can be located at the sealing member 400, and when there is a recess 120, it 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.

[0047] In the embodiment of the present disclosure, when the value of A is in the range of 1.0 mm to 1.5 mm, the upper edge of the first pole tab 220 is located at the recess 120. If the value of A is less than 1 mm, the first pole tab 220 will extend out of the seal 400, affecting the sealing effect of the battery. If the value of A is greater than 1.5 mm, the upper edge of the first pole tab 220 "cannot reach" the welding point 111 preset at the corresponding seal 400 position of the metal shell 100, resulting in the metal shell 100 and the first pole tab 220 cannot be tightly connected.

[0048] See also Figure 1 , Figure 5 and Figure 6 , the distance from the upper edge of the metal shell 100 to the uppermost welding point 111 can be represented by B, and the value range of B can be 1.5 mm to 2.2 mm. At this time, the uppermost welding point 111 of the metal shell 100 can be located at the sealing member 400, and when there is a recess 120, it can be located at 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.

[0049] When the value of B is in the range of 1.5 mm to 2.2 mm, the uppermost welding point 111 of the metal shell 100 is located at the seal 400. If the value of B is less than 1.5 mm, the welding point 111 of the metal shell 100 is located above the seal 400 and cannot contact the upper edge of the first pole tab 220 in the recess 120; if the value of B is greater than 2.2 mm, the uppermost welding point 111 of the metal shell 100 is located below the seal 400. When the metal shell 100 and the first pole tab 220 are "welded" due to defocusing or other reasons, the electrolyte will directly penetrate out, affecting the sealing performance of the battery.

[0050] In this embodiment, based on the setting 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 out of focus (that is, two adjacent welding points 111 will adhere to each other, and the electrolyte will penetrate out); if the diameter of the welding point 111 is too small, the metal shell 100 and the first pole ear 220 will not be welded firmly, resulting in a large fluctuation in the resistance value of the drop internal resistance.

[0051] In one embodiment, see Figures 1 to 6 A plurality of welding points 111 may be provided between the first pole tab 220 and the metal shell 100. The plurality of welding points 111 may be arranged at intervals along the first direction and / or the second direction. The first direction may be the extension direction of the first pole tab 220, and the second direction may be the circumferential direction of the battery. When the battery is cylindrical, the first direction may be the axial direction of the battery, and the second direction may be the circumferential direction of the battery. A plurality of welding points 111 are provided to ensure that the first pole tab 220 can be stably welded to the metal shell 100, 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.

[0052] 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 pole tab 220 cannot be firmly welded to the metal shell 100.

[0053] 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 "leaked" due to multiple welding, which will affect the sealing performance and use effect of the battery.

[0054] 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.

[0055] For example, when there are six welding points 111, there may be two distribution arrangements. Figure 1 and Figure 2 The six welding points 111 may be distributed in three rows and two columns, with two welding points 111 arranged in each row along the second direction and three welding points 111 arranged in each column along the first direction. Figure 6 The six welding points 111 may be distributed in two rows and three columns, three welding points 111 may be arranged in each row along the second direction, and two welding points 111 may be arranged in each column along the first direction.

[0056] In this implementation, see Figures 1 to 6 , 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, which is not specifically limited here. If the distance is too close, the adjacent welding points 111 will stick together and the electrolyte will seep out; if the distance between adjacent welding points 111 is too far, the stability of the metal shell 100 and the first pole ear 220 after welding will be affected.

[0057] See also Figures 1 to 6 , the production of the battery may include the following steps and methods:

[0058] S910 , the first electrode tab 220 is welded to the cell body 230 by ultrasonic welding.

[0059] S930 , using a winding machine to wind the battery cell body 230 into a battery cell.

[0060] S950, place the battery cell into the metal shell 100, and then place it into the fixture. The first pole ear 220 after entering the shell contacts the metal shell 100, and the metal shell 100 and the first pole ear 220 are welded and fixed by welding equipment. The welding tension is 18-25N, 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.

[0061] S970, insert the sealing member 400, and seal the battery using a sealing machine.

[0062] The battery of this embodiment is subjected to a drop test when fully charged, and the measured drop internal resistance is below 80 mΩ. The fluctuation range of the drop internal resistance measured in multiple tests is not large, which ensures the performance of the battery.

[0063] According to a second aspect of the embodiments of the present disclosure, there is provided an electrical device which may include a battery according to any one of the above embodiments and has all the beneficial effects of the above batteries, which will not be described in detail here.

[0064] The present disclosure does not limit the type of electrical equipment, for example, it can 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 can be a fuel vehicle, a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc.

[0065] 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 in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0066] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0067] In addition, 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, characterized in that: include: Metal housing; as well as The battery cell assembly is accommodated in the metal shell and comprises a first pole ear and a battery cell body which are electrically connected. The first pole ear is fitted on the inner surface of the metal shell and welded to the metal shell.

2. The battery according to claim 1, characterized in that The battery comprises a sealing member, the sealing member covers the opening of the metal shell, and the first electrode tab is clamped between the outer wall of the sealing member and the inner wall of the metal shell.

3. The battery according to claim 2, characterized in that The metal housing and the sealing member are both formed with a recessed portion that is recessed inwardly along the circumferential outer side of the battery.

4. The battery according to claim 2, characterized in that The battery comprises a second pole tab and a guide pin, the sealing member is provided with a through hole, one end of the guide pin is electrically connected to the second pole tab, and the other end thereof extends out of the metal shell through the through hole.

5. The battery according to claim 2, characterized in that The battery comprises a pressure relief valve, and the pressure relief valve is disposed through the sealing member.

6. The battery according to claim 2, characterized in that An upper edge of the first electrode tab is lower than an upper edge of the sealing member.

7. The battery according to claim 2, characterized in that The welding point between the metal shell and the first pole tab is not lower than the lower edge of the sealing member.

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

9. The battery according to any one of claims 6 to 8, characterized in that: The distance between the upper edge of the metal shell and the upper edge of the first pole lug is in the range of 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.

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

11. The battery according to claim 1, characterized in that A plurality of welding points are provided between the first pole lug 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 an extension direction of the first pole lug, and the second direction is a circumferential direction of the battery.

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

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

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

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