Battery and electric equipment

Abstract

The utility model discloses a battery and electric equipment. The battery comprises a shell, a cover plate assembly, a first battery cell, a second battery cell and a conductive connecting piece, wherein the shell is provided with an opening part; the cover plate assembly covers the opening part, and the shell and the cover plate assembly are enclosed to form an accommodating space; the first battery cell and the second battery cell are arranged in the accommodating space, and the first battery cell and the second battery cell are connected in parallel or in series; the conductive connecting sheet is arranged in the accommodating space, and the first battery cell is connected and conducted with the cover plate assembly; and the second battery cell is connected and conducted with the cover plate assembly through the conductive connecting sheet.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a battery and an electrical device. Background Art

[0002] In recent years, with the development of science and technology, various electronic products have entered thousands of households and become people's daily necessities. As the power source of electronic products, the performance of batteries in various aspects is one of the important indicators to measure the quality of electronic products. Among them, lithium-ion batteries have the advantages of high single-cell energy density and long service life, and are therefore widely used in electric vehicles, electric bicycles, energy storage equipment and other fields.

[0003] In the prior art, the stability of the structure and the energy density of lithium-ion batteries still need to be improved. Utility Model Content

[0004] One purpose of the present application is to provide a new technical solution for batteries and electrical equipment.

[0005] According to a first aspect of the present application, a battery is provided, comprising:

[0006] A housing, wherein the housing is provided with an opening;

[0007] A cover plate assembly, the cover plate assembly is covered on the opening, and the housing and the cover plate assembly are enclosed to form an accommodating space;

[0008] A first battery cell and a second battery cell, wherein the first battery cell and the second battery cell are arranged in the accommodating space, and the first battery cell and the second battery cell are connected in parallel or in series;

[0009] A conductive connecting sheet is disposed in the accommodating space, the first battery cell is connected and conducted with the cover assembly; the second battery cell is connected and conducted with the cover assembly via the conductive connecting sheet.

[0010] Optionally, the connection between the conductive connecting sheet and the cover plate assembly is laser welding.

[0011] Optionally, the connection between the conductive connecting sheet and the second battery core is ultrasonic welding.

[0012] Optionally, the connection between the first battery cell and the cover plate assembly is laser welding.

[0013] Optionally, the conductive connecting sheet includes a first sheet and a second sheet that are fixedly connected to each other, the first sheet is connected to the cover plate assembly, and the second sheet is connected to the second battery core.

[0014] Optionally, the thickness of the first sheet is greater than the thickness of the second sheet.

[0015] Optionally, the thickness of the first sheet is 1.5 mm to 2.5 mm; and / or the thickness of the second sheet is 0.3 mm to 1.5 mm.

[0016] Optionally, the first battery cell includes a first core body and a first pole lug extending from the first core body, and the first pole lug is connected and conductively connected to the cover plate assembly;

[0017] The second battery cell includes a second core body and a second pole tab extending from the second core body, and the second pole tab is connected to the cover plate assembly through the conductive connecting sheet.

[0018] Optionally, the shell has two openings arranged opposite to each other, and a cover plate assembly is arranged corresponding to each of the openings; the first pole ear includes a first positive pole ear and a first negative pole ear, and the second pole ear includes a second positive pole ear and a second negative pole ear; the first positive pole ear and the second positive pole ear are arranged corresponding to one of the cover plate assemblies, and the first negative pole ear and the second negative pole ear are arranged corresponding to the other cover plate assembly.

[0019] Optionally, the cover plate assembly includes a cover body, a pole, a lead-out plate, a first insulating member and a second insulating member, the cover body is provided with a first through hole portion, the lead-out plate is provided with a second through hole portion, and the pole is sleeved in the first through hole portion and the second through hole portion; the first insulating member is arranged between the cover body and the lead-out plate, and the second insulating member is arranged between the cover body and the pole;

[0020] The first battery cell is connected and conducted with the lead-out piece and the pole; the second battery cell is connected and conducted with the lead-out piece and the pole through the conductive connecting piece.

[0021] Optionally, the first sheet body, the second sheet body and the lead sheet are all in the shape of thin sheets, and the conductive connecting sheet can be bent into an L-shape.

[0022] Optionally, the lead-out piece has a notch portion, and the lead-out piece is connected and conducted with the first battery core on one side of the notch portion; and the lead-out piece is connected and conducted with the second battery core through the conductive connecting piece on the other side of the notch portion.

[0023] Optionally, the thickness of the lead-out piece is greater than or equal to 1.0 mm.

[0024] Optionally, the thickness of the lead-out sheet is greater than or equal to the thickness of the conductive connecting sheet.

[0025] Optionally, the conductive connecting sheet includes a first sheet body and a second sheet body that are fixedly connected to each other, and the first sheet body and the lead-out sheet are laser welded.

[0026] Optionally, the battery further includes a tape, and the tape is used to fix the first battery cell and the second battery cell, a portion of the tape is bonded to the first battery cell, and another portion of the tape is bonded to the second battery cell.

[0027] According to a second aspect of the present application, an electrical device is provided, wherein the electrical device comprises the battery as described in the first aspect.

[0028] The battery provided in the embodiment of the present application can reduce the number of times the battery cell is directly welded to the cover plate, thereby reducing the complexity of the battery assembly process, while reducing the component connection cost and material cost; and is beneficial to improving the safety performance and energy density of the battery structure.

[0029] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0031] Figure 1 is a schematic diagram of a partial cross-sectional structure of a battery according to an embodiment of the present application;

[0032] Figure 2 is a schematic diagram of an exploded structure of a battery according to an embodiment of the present application;

[0033] Figure 3 is a schematic structural diagram of a lead-out sheet in a battery according to an embodiment of the present application;

[0034] Figure 4 It is a schematic diagram of the structure of a conductive connecting piece in a battery according to an embodiment of the present application.

[0035] Description of reference numerals:

[0036] 1. Battery; 11. Shell; 12. Cover plate assembly; 121. Cover body; 122. Post; 123. Lead-out sheet; 1230. Second through-hole portion; 1200. Notch portion; 124. First insulating member; 125. Second insulating member; 13. First battery cell; 131. First core body; 130. First pole ear; 14. Second battery cell; 141. Second core body; 140. Second pole ear; 15. Conductive connecting sheet; 151. First sheet body; 152. Second sheet body; 16. Insulating ring; 17. Spacer; 18. Tape. DETAILED DESCRIPTION

[0037] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0038] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0039] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0040] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0041] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0042] Reference Figure 1-Figure 4 As shown, according to an embodiment of the present application, a battery 1 is provided. The battery 1 includes a shell 11 and a cover assembly 12, wherein the shell 11 is provided with an opening; the cover assembly 12 is covered at the opening, and the shell 11 and the cover assembly 12 enclose a receiving space; the battery 1 also includes a first battery cell 13 and a second battery cell 14, wherein the first battery cell 13 and the second battery cell 14 are provided in the receiving space, and the first battery cell 13 and the second battery cell 14 are connected in parallel or in series; the battery 1 also includes a conductive connecting sheet 15, wherein the conductive connecting sheet 15 is provided in the receiving space, and the first battery cell 13 is connected and conducted with the cover assembly 12; the second battery cell 14 is connected and conducted with the cover assembly 12 through the conductive connecting sheet 15.

[0043] In the battery provided in the embodiment of the present application, two battery cells, namely a first battery cell 13 and a second battery cell 14, are arranged in series or in parallel in the accommodating space enclosed by the shell 11 and the cover assembly 12; wherein the first battery cell 13 is directly connected to the cover assembly 12, that is, the first battery cell 13 and the cover assembly 12 are not connected through a conductive connecting sheet; only the second battery cell 14 is connected to the cover assembly 12 through a conductive connecting sheet 15 arranged in the accommodating space; therefore, the battery provided in the embodiment of the present application only includes one conductive connecting sheet 15 arranged in the accommodating space.

[0044] Since the conductive connecting piece 15 is connected to the battery cell and the cover plate assembly by welding, compared with setting two conductive connecting pieces, setting only one conductive connecting piece can reduce the number of welding times, thereby reducing the complexity of the battery assembly process, while reducing welding costs and material costs.

[0045] At the same time, due to the difference in chemical composition between the surface and interior of the metal grains and the phenomenon of grain boundary impurities or internal stress at the welding point, the welding point is easily affected by temperature expansion stress during long-term use of the battery, resulting in welding failure, which greatly affects the safety performance and service life of the lithium-ion battery. Therefore, reducing the number of welding times is beneficial to improving the safety performance and service life of the battery.

[0046] In addition, since the conductive connecting sheet arranged in the accommodating space will compress the effective space occupied by the battery cell in the accommodating space, thereby affecting the energy density of the battery, therefore, only one conductive connecting sheet is more conducive to improving the energy density of the battery than two conductive connecting sheets.

[0047] In one embodiment, the connection between the conductive connecting plate 15 and the cover plate assembly 12 is laser welding; the connection between the conductive connecting plate 15 and the second battery cell 14 is ultrasonic welding; and the connection between the first battery cell 13 and the cover plate assembly 12 is laser welding.

[0048] In this specific example, the conductive connecting sheet 15 is connected to the cap assembly 12 by laser welding, which is conducive to forming a stable connection at a faster welding speed; the conductive connecting sheet 15 is connected to the second battery cell 14 by ultrasonic welding, which has high welding cleanliness and is not easy to damage and deform the second battery cell 14. The first battery cell 13 is connected to the cap assembly 12 by laser welding, which is conducive to forming a stable connection at a faster welding speed.

[0049] Reference Figure 4 As shown, in one embodiment, the conductive connecting sheet 15 includes a first sheet 151 and a second sheet 152 which are fixedly connected to each other, the first sheet 151 is connected to the cover plate assembly 12, and the second sheet 152 is connected to the second battery cell 14; the thickness of the first sheet 151 is greater than the thickness of the second sheet 152.

[0050] In this specific example, since the welding power of laser welding is relatively large, the thickness of the first sheet 151 connected to the cover assembly 12 by laser welding is set to be thicker to avoid damage to the first sheet 151 during welding; and the welding power of ultrasonic welding is relatively small and not easy to cause damage, so the thickness of the second sheet 152 connected to the second battery cell 14 by ultrasonic welding is set to be thinner, which is beneficial to saving the size of the accommodation space occupied by the conductive connecting sheet 15.

[0051] In a specific example, the thickness of the first sheet 151 is 1.5 mm to 2.5 mm; and / or the thickness of the second sheet 152 is 0.3 mm to 1.5 mm.

[0052] Reference Figure 1-Figure 2 As shown, in one embodiment, the first battery cell 13 includes a first core body 131 and a first pole ear 130 led out from the first core body 131, and the first pole ear 130 is connected and conducted with the cover plate assembly 12;

[0053] The second battery cell 14 includes a second core body 141 and a second pole tab 140 extending from the second core body 141 . The second pole tab 140 is connected to the cover plate assembly 12 through the conductive connecting sheet 15 .

[0054] In this specific example, the first pole ear 130 of the first battery cell 13 led out from the first core body 131 is connected to the cover assembly 12; the second pole ear 140 of the second battery cell 14 led out from the second core body 141 is connected to the cover assembly 12 through the conductive connecting sheet 15.

[0055] The first pole ear 130 is directly connected to the cover plate assembly 12, and the second pole ear 140 is connected to the cover plate assembly 12 through the transfer function of the conductive connecting piece 15; when the battery is welded and assembled, it is helpful to eliminate the limitation of the relative position of the two pole ears and the cover plate during welding. At the beginning of welding, the cover plate and the first pole ear 130 are in a 180° position relationship. After the first pole ear 130 is welded, the cover plate is turned 90°, and the second pole ear 140 is welded on the conductive connecting piece 15. In this way, it is easy to complete the welding process of the entire cover plate and the two pole ears, and the transfer function of the conductive connecting piece 15 is helpful to ensure that the length of the first pole ear 130 and the second pole ear 140 is consistent (if the length of the first pole ear 130 and the second pole ear 140 is inconsistent, it can be compensated by adjusting the conductive connecting piece 15), so that the internal resistance of the first pole ear 130 and the second pole ear 140 is consistent. In addition, by adopting the method of setting the conductive connecting piece on one side, the space required for the first pole ear 130 and the second pole ear 140 is guaranteed, and the welding process is not limited by the number of pole ear layers.

[0056] In addition, the first sheet 151 and the second sheet 152 are in the shape of thin sheets, and the conductive connecting sheet 15 can be bent into an L-shape. During welding and assembly, the first sheet 151 and the second sheet 152 of the conductive connecting sheet 15 are in an L-shape with a certain angle (e.g., a vertical angle). After welding, the first sheet 151 and the second sheet 152 are bent into a structure in the same plane.

[0057] Reference Figure 1-Figure 2 As shown, in one embodiment, the shell 11 has two opening portions arranged opposite to each other, and a cover plate assembly 12 is arranged corresponding to each of the opening portions; the first pole ear 130 includes a first positive pole ear and a first negative pole ear, and the second pole ear 140 includes a second positive pole ear and a second negative pole ear; the first positive pole ear and the second positive pole ear are arranged corresponding to one of the cover plate assemblies 12, and the first negative pole ear and the second negative pole ear are arranged corresponding to the other cover plate assembly 12.

[0058] In this specific example, the first positive electrode tab and the first negative electrode tab led out of the first battery cell 13 are respectively located at the two ends of the length direction of the shell 11; the second positive electrode tab and the second negative electrode tab led out of the second battery cell 14 are also respectively located at the two ends of the length direction of the shell 11;

[0059] In this way, the first positive electrode tab and the first negative electrode tab are far apart, and the second positive electrode tab and the second negative electrode tab are also far apart, thereby avoiding short circuit caused by contact between the first positive electrode tab and the first negative electrode tab, and between the second positive electrode tab and the second negative electrode tab when the battery collides or shakes.

[0060] Reference Figure 1-Figure 3 As shown, in one embodiment, the cover plate assembly 12 includes a cover body 121, a pole 122, a lead-out piece 123, a first insulating member 124 and a second insulating member 125, the cover body 121 is provided with a first through hole portion, the lead-out piece 123 is provided with a second through hole portion 1230, the pole 122 is sleeved in the first through hole portion and the second through hole portion 1230; the first insulating member 124 is arranged between the cover body 121 and the lead-out piece 123, and the second insulating member 125 is arranged between the cover body 121 and the pole 122;

[0061] The first battery cell 13 is connected to and conducted with the lead-out piece 123 and the pole 122 ; the second battery cell 14 is connected to and conducted with the lead-out piece 123 and the pole 122 via the conductive connecting piece 15 .

[0062] In this specific example, the lead-out piece 123 included in the cover plate assembly 12 is connected and conducted with the first battery cell 13, and the lead-out piece 123 is in the shape of a thin sheet; and the lead-out piece 123 is connected and conducted with the second battery cell 14 through the conductive connecting piece 15. In addition, the battery also includes an insulating ring 16 sleeved on the periphery of the pole 122, and the insulating ring 16 can be made of, for example, ceramic material, which can play an insulating role; the battery also includes a spacer 17, and each pole ear is provided with a spacer 17, and the spacer 17 can play a supporting role for the pole ear. The first insulating member 124 plays an insulating role between the cover body 121 and the lead-out piece 123, and a receiving groove is provided on the first insulating member 124 for accommodating the lead-out piece 123; the second insulating member 125 plays an insulating role between the cover body 121 and the pole 122. Optionally, the first sheet 151 in the conductive connecting sheet 15 is laser welded with the lead-out piece 123.

[0063] Reference Figure 1-Figure 3 As shown, in one embodiment, the lead-out piece 123 has a notch portion 1200, and the lead-out piece 123 is connected and conducted to the first battery cell 13 on one side of the notch portion 1200; the lead-out piece 123 is connected and conducted to the second battery cell 14 through the conductive connecting piece 15 on the other side of the notch portion 1200.

[0064] In this specific example, the lead-out piece 123 is connected to the first battery core 13 and the second battery core 14 at both sides of the notch portion 1200 , respectively; this helps to avoid affecting the other battery core when welding one of the battery cores.

[0065] In one embodiment, the thickness of the lead-out piece 123 is greater than or equal to 1.0 mm.

[0066] In this specific example, the thickness of the lead-out sheet 123 is greater than or equal to 1.0 mm, which helps to ensure that the battery has a higher current carrying capacity.

[0067] In one embodiment, the thickness of the lead-out sheet 123 is greater than or equal to the thickness of the conductive connecting sheet 15 .

[0068] In one embodiment, the battery further includes a tape 18 for fixing the first battery cell 13 and the second battery cell 14 , wherein a portion of the tape 18 is bonded to the first battery cell 13 , and another portion of the tape 18 is bonded to the second battery cell 14 .

[0069] In this specific example, the adhesive tape 18 fixes the first battery cell 13 and the second battery cell 14 to prevent the first battery cell 13 and the second battery cell 14 from shaking and position shifting during use.

[0070] According to another embodiment of the present application, an electric device is provided, wherein the electric device comprises the battery 1 as described above.

[0071] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0072] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A battery, characterized in that: The battery comprises: A housing (11), wherein the housing (11) is provided with an opening; A cover plate assembly (12), the cover plate assembly (12) being arranged to cover the opening portion, and the housing (11) and the cover plate assembly (12) enclose a receiving space; A first battery cell (13) and a second battery cell (14), wherein the first battery cell (13) and the second battery cell (14) are arranged in the accommodating space, and the first battery cell (13) and the second battery cell (14) are connected in parallel or in series; A conductive connecting sheet (15), wherein the conductive connecting sheet (15) is arranged in the accommodating space, the first battery cell (13) is connected and conducted with the cover plate assembly (12); and the second battery cell (14) is connected and conducted with the cover plate assembly (12) via the conductive connecting sheet (15).

2. The battery according to claim 1, characterized in that The connection between the conductive connecting sheet (15) and the cover plate assembly (12) is laser welding.

3. The battery according to claim 1, characterized in that The connection between the conductive connecting sheet (15) and the second battery core (14) is ultrasonic welding.

4. The battery according to claim 1, characterized in that The connection between the first battery cell (13) and the cover plate assembly (12) is laser welding.

5. The battery according to claim 1, characterized in that The conductive connecting sheet (15) comprises a first sheet body (151) and a second sheet body (152) which are fixedly connected to each other, the first sheet body (151) being connected to the cover plate assembly (12), and the second sheet body (152) being connected to the second battery core (14).

6. The battery according to claim 5, characterized in that The thickness of the first sheet (151) is greater than the thickness of the second sheet (152).

7. The battery according to claim 6, characterized in that The thickness of the first sheet (151) is 1.5 mm to 2.5 mm; and / or, The thickness of the second sheet (152) is 0.3 mm to 1.5 mm.

8. The battery according to claim 1, characterized in that The first battery cell (13) comprises a first core body (131) and a first pole lug (130) extending from the first core body (131), and the first pole lug (130) is connected and conductively connected to the cover plate assembly (12); The second battery cell (14) comprises a second core body (141) and a second pole lug (140) extending from the second core body (141); the second pole lug (140) is connected to the cover plate assembly (12) via the conductive connecting sheet (15).

9. The battery according to claim 8, characterized in that The shell (11) has two openings arranged opposite to each other, and a cover plate assembly (12) is arranged corresponding to each of the openings; the first pole lug (130) includes a first positive pole lug and a first negative pole lug, and the second pole lug (140) includes a second positive pole lug and a second negative pole lug; the first positive pole lug and the second positive pole lug are arranged corresponding to one of the cover plate assemblies (12), and the first negative pole lug and the second negative pole lug are arranged corresponding to the other of the cover plate assemblies (12).

10. The battery according to claim 1, characterized in that The cover plate assembly (12) comprises a cover body (121), a pole (122), a lead-out plate (123), a first insulating member (124) and a second insulating member (125); the cover body (121) is provided with a first through hole portion, the lead-out plate (123) is provided with a second through hole portion (1230), and the pole (122) is sleeved in the first through hole portion and the second through hole portion (1230); the first insulating member (124) is arranged between the cover body (121) and the lead-out plate (123), and the second insulating member (125) is arranged between the cover body (121) and the pole (122); The first battery cell (13) is connected and conducted with the lead-out piece (123) and the pole (122); and the second battery cell (14) is connected and conducted with the lead-out piece (123) and the pole (122) via the conductive connecting piece (15).

11. The battery according to claim 10, characterized in that The conductive connecting sheet (15) comprises a first sheet (151) and a second sheet (152) which are fixedly connected to each other, the first sheet (151), the second sheet (152) and the lead sheet (123) are all in the shape of thin sheets, and the conductive connecting sheet (15) can be bent into an L-shape.

12. The battery according to claim 10, characterized in that The lead-out piece (123) has a notch portion (1200), and the lead-out piece (123) is connected and conducted with the first battery core (13) on one side of the notch portion (1200); and the lead-out piece (123) is connected and conducted with the second battery core (14) through the conductive connecting piece (15) on the other side of the notch portion (1200).

13. The battery according to claim 10, characterized in that The thickness of the lead-out piece (123) is greater than or equal to 1.0 mm.

14. The battery according to claim 10, characterized in that The thickness of the lead-out sheet (123) is greater than or equal to the thickness of the conductive connecting sheet (15).

15. The battery according to claim 10, characterized in that The conductive connecting sheet (15) comprises a first sheet body (151) and a second sheet body (152) which are fixedly connected to each other, and the first sheet body (151) and the lead-out sheet (123) are laser welded.

16. The battery according to claim 1, characterized in that The battery further comprises an adhesive tape (18), wherein the adhesive tape (18) is used to fix the first battery cell (13) and the second battery cell (14), wherein a portion of the adhesive tape (18) is bonded to the first battery cell (13), and another portion of the adhesive tape (18) is bonded to the second battery cell (14).

17. An electrical equipment, characterized in that: The electrical device comprises a battery as claimed in any one of claims 1 to 16.

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