Battery and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery and a battery pack, the battery comprises an enclosing structure, a first plate body and a second plate body enclose to form an accommodating space; the positive pole and the negative pole are simultaneously arranged on the first plate body, the positive pole is connected with the first plate body, and the negative pole is insulated from the first plate body; the pole group is arranged in the accommodating space, the pole group comprises a main body, a positive tab and a negative tab, the positive tab and the negative tab are respectively connected with two ends of the main body along the length direction, the positive tab is connected with the second plate body, and the negative tab is connected with the negative pole. According to the utility model, for a pole group with tabs at two ends, the positive pole and the negative pole which are respectively arranged on the first plate body and the second plate body are arranged on the first plate body, and the positive tabs and the positive pole are electrically connected through the second plate body, the enclosure structure and the first plate body, so that the battery forms a structure with the tabs at the same side; the overall volume of the battery is reduced and the space utilization rate and energy density of the battery are improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to batteries and battery packs. Background Technology

[0002] Batteries typically consist of an external structure and an internal structure. The external structure includes a casing and battery covers, which are connected to form a closed space. The internal structure includes an electrode assembly housed within this closed space. In existing technologies, battery covers are connected to both ends of the casing. Each battery cover includes a terminal post, and the positive and negative tabs of the electrode assembly are welded to the terminals of the two battery covers respectively to achieve electrical connection. This results in a large overall battery volume, low space utilization, and a decrease in energy density. Utility Model Content

[0003] In view of this, the present invention provides a battery and battery pack to solve the problem that the overall volume of the battery in the prior art is large, resulting in low battery space utilization and affecting the energy density of the battery.

[0004] In a first aspect, this utility model provides a battery, comprising: an enclosing structure having openings at both ends; a first plate and a second plate, the first plate and the second plate being respectively connected to the two ends of the enclosing structure and sealing the corresponding openings, the enclosing structure, the first plate and the second plate enclosing to form an accommodating space; a positive electrode post and a negative electrode post, simultaneously disposed on the first plate, the positive electrode post being connected to the first plate and the negative electrode post being insulated from the first plate; and an electrode assembly disposed within the accommodating space, the electrode assembly comprising a main body, a positive electrode tab and a negative electrode tab, the positive electrode tab and the negative electrode tab being respectively connected to the two ends of the main body along the length direction, the positive electrode tab being connected to the second plate and the negative electrode tab being connected to the negative electrode post.

[0005] In one alternative embodiment, both the first plate and the second plate are welded to the enclosing structure; or, one of the first plate and the second plate is integrally formed with the enclosing structure, and the other of the first plate and the second plate is welded to the enclosing structure.

[0006] In one alternative embodiment, the positive electrode post is a convex structure stamped from the first plate toward the side away from the receiving space.

[0007] In one optional embodiment, the first plate has a mounting hole, and the positive electrode post is inserted into the mounting hole and welded to the first plate.

[0008] In one optional embodiment, the battery further includes an end plate disposed between the end of the second plate and the end of the main body connected to the positive electrode tab. The end plate has a through groove and a guide surface. The positive electrode tab passes through the through groove and is bent to be close to or fit against the guide surface. After being bent multiple times, the positive electrode tab is fitted and connected to the second plate.

[0009] In one alternative embodiment, the battery further includes an explosion-proof valve disposed on at least one of the first plate, the second plate, and the enclosing structure.

[0010] In one alternative embodiment, the explosion-proof valve is integrally formed with at least one of the first plate, the second plate, and the enclosing structure.

[0011] In one optional embodiment, the first plate and / or the second plate are provided with injection holes.

[0012] In one alternative embodiment, the battery has a length of 300mm to 2000mm, a width of 50mm to 200mm, and a thickness of 10mm to 20mm.

[0013] Secondly, this utility model also provides a battery pack, including the aforementioned battery.

[0014] The technical solution of this application has the following advantages:

[0015] For the electrode assembly with tabs at both ends, the positive and negative terminals, which should be set on the first plate and the second plate respectively, are both set on the first plate. The positive tabs and positive terminals are electrically connected through the second plate, the enclosure structure and the first plate, so that the battery forms a terminal structure with the same side, reducing the overall volume of the battery and improving the space utilization and energy density of the battery. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of a battery according to an embodiment of the present utility model;

[0018] Figure 2 for Figure 1The diagram shows the exploded structure of the battery.

[0019] Figure 3 for Figure 1 A top view of the battery shown;

[0020] Figure 4 for Figure 1 The battery shown is in a bottom view.

[0021] Figure 5 Figure 4 Cross-sectional view along the BB direction;

[0022] Figure 6 This is a schematic diagram of the positive electrode post integrally formed with the first plate according to an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the positive electrode post welded to the first plate in an embodiment of the present invention;

[0024] Figure 8 for Figure 7 The diagram shows the exploded structure of the first plate and the positive electrode post.

[0025] Figure 9 for Figure 8 Schematic diagram of the positive electrode post;

[0026] Figure 10 This is a schematic diagram of the structure of the second plate and the explosion-proof valve in an embodiment of the present invention;

[0027] Figure 11 for Figure 3 Partial sectional view along the AA direction;

[0028] Figure 12 This is a schematic diagram of the structure of a first embodiment of the battery according to this utility model;

[0029] Figure 13 This is a schematic diagram of the structure of a second embodiment of the battery according to this utility model;

[0030] Figure 14 This is a schematic diagram of the third embodiment of the battery according to this utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Enclosure structure; 101. First side plate; 102. Second side plate; 2. First plate body; 201. Mounting hole; 3. Second plate body; 4. Positive electrode post; 401. Protrusion; 402. Insertion part; 5. Negative electrode post; 6. Electrode group; 601. Main body; 602. Positive electrode ear; 603. Negative electrode ear; 7. End plate; 701. Through groove; 702. Guide surface; 8. Explosion-proof valve; 9. Liquid injection hole; 10. Riveting block; 11. Upper insulating component; 12. Sealing component; 13. Lower insulating component. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] The following is combined with Figures 1 to 14 The following describes embodiments of the present invention.

[0035] According to an embodiment of the present invention, a battery is provided, comprising: an enclosure structure 1 having openings at both ends; a first plate 2 and a second plate 3, the first plate 2 and the second plate 3 being connected to the two ends of the enclosure structure 1 and sealing the corresponding openings, the enclosure structure 1, the first plate 2 and the second plate 3 enclosing and forming an accommodating space; a positive electrode post 4 and a negative electrode post 5, both disposed on the first plate 2, the positive electrode post 4 being connected to the first plate 2 and the negative electrode post 5 being insulated from the first plate 2; and an electrode assembly 6 disposed within the accommodating space, the electrode assembly 6 comprising a main body 601, a positive electrode tab 602 and a negative electrode tab 603, the positive electrode tab 602 and the negative electrode tab 603 being connected to the two ends of the main body 601 along the length direction, the positive electrode tab 602 being connected to the second plate 3 and the negative electrode tab 603 being connected to the negative electrode post 5.

[0036] In this embodiment, for the electrode group 6 with tabs at both ends, the positive electrode post 4 and the negative electrode post 5, which should be respectively set on the first plate 2 and the second plate 3, are both set on the first plate 2. The positive electrode post 602 is electrically connected to the positive electrode post 4 through the second plate 3, the enclosure structure 1 and the first plate 2, so that the battery forms a same-side electrode post structure, reducing the overall volume of the battery and improving the space utilization and energy density of the battery.

[0037] Furthermore, in this embodiment, the battery only requires the lower plastic, sealing ring, and upper plastic structures to be provided for the first plate 2 and the negative electrode post 5, while the lower plastic, sealing ring, and upper plastic structures are omitted for the second plate 3 and the positive electrode post 4. Therefore, the production cost can be greatly reduced, internal space can be saved, and the battery capacity can be increased.

[0038] It is worth noting that, such as Figure 1 and Figure 2 As shown, the enclosure structure 1 includes two first side plates 101 and two second side plates 102. The two first side plates 101 are arranged at intervals relative to each other, and the two second side plates 102 are arranged at intervals relative to each other. The first side plates 101 and the second side plates 102 are connected in the circumferential direction.

[0039] In one embodiment, such as Figure 5 and Figure 12 As shown, both the first plate 2 and the second plate 3 are welded to the enclosing structure 1. That is, the four sides of the first plate 2 are welded to one end of the two first side plates 101 and the two second side plates 102, and the four sides of the second plate 3 are welded to the other ends of the two first side plates 101 and the two second side plates 102. During the manufacturing process, the enclosing structure 1 with openings at both ends is first formed. In subsequent processes, the two openings are sealed by welding the first plate 2 and the second plate 3 to the two ends of the enclosing structure 1.

[0040] As an alternative implementation method, such as Figure 13 and Figure 14 As shown, one of the first plate 2 and the second plate 3 is integrally formed with the enclosing structure 1, and the other of the first plate 2 and the second plate 3 is welded to the enclosing structure 1. That is, during the processing, one of the first plate 2 and the second plate 3 is processed together with the enclosing structure 1 to form a shell with an assembly opening at one end. In other words, the shell includes the enclosing structure 1 and one of the first plate 2 and the second plate 3. During the processing, one end opening of the enclosing structure 1 has been sealed, while the other end opening of the enclosing structure 1 serves as the assembly opening and will be sealed subsequently by welding it to the other of the first plate 2 and the second plate 3.

[0041] In summary, in the first embodiment of the battery, such as Figure 5 and Figure 12 As shown, both the first plate 2 and the second plate 3 are welded to the enclosing structure 1; in the second embodiment of the battery, as... Figure 13 As shown, the first plate 2 is welded to the enclosing structure 1, and the second plate 3 is integrally formed with the enclosing structure 1; in the third embodiment of the battery, as... Figure 14 As shown, the first plate 2 is integrally formed with the enclosing structure 1, and the second plate 3 is welded to the enclosing structure 1.

[0042] In one embodiment, such as Figure 6 As shown, the positive electrode post 4 is a convex structure stamped and formed on the side of the first plate 2 facing away from the receiving space. That is, the positive electrode post 4 and the first plate 2 are an integral structure, formed by die stamping and stretching.

[0043] As an alternative implementation method, such as Figures 7 to 9 As shown, the first plate 2 has a mounting hole 201, and the positive electrode post 4 is inserted into the mounting hole 201 and welded to the first plate 2. Further, the positive electrode post 4 includes a protrusion 401 and a insertion portion 402, which are connected. The insertion portion 402 is inserted into the mounting hole 201 and welded to the first plate 2 to form a single unit. The protrusion 401 is located on the side of the first plate 2 away from the receiving space.

[0044] In one embodiment, such as Figure 11 As shown, the first plate 2 has a pole hole, the negative pole 5 passes through the pole hole, and the negative pole 5 is fixed to the first plate 2 by the riveting block 10. An upper insulating member 11 is provided between the riveting block 10 and the first plate 2. A sealing member 12 is provided between the negative pole 5 and the hole wall of the pole hole. A lower insulating member 13 is attached to the side of the first plate 2 facing the receiving space.

[0045] In one embodiment, such as Figure 2 and Figure 5 As shown, the battery also includes an end plate 7, which is disposed between the end of the second plate 3 and the main body 601 where the positive electrode tab 602 is connected. The end plate 7 has a through groove 701 and a guide surface 702. The positive electrode tab 602 passes through the through groove 701 and is bent to be close to or fit against the guide surface 702. After being bent multiple times, the positive electrode tab 602 is fitted and connected to the second plate 3. By setting the end plate 7, space is provided for the bending of the positive electrode tab 602, and the bending direction of the positive electrode tab 602 is guided, which facilitates the welding of the positive electrode tab 602 to the second plate 3.

[0046] In one embodiment, such as Figure 4 and Figure 10 As shown, the battery also includes an explosion-proof valve 8, which is disposed on at least one of the first plate 2, the second plate 3, and the enclosing structure 1. By providing the explosion-proof valve 8, venting can be achieved in the event of thermal runaway of the battery, preventing the battery from exploding and ensuring the battery's safety performance.

[0047] Furthermore, in one embodiment, the explosion-proof valve 8 is integrally formed with at least one of the first plate 2, the second plate 3, and the enclosing structure 1. Specifically, in this embodiment, as... Figure 4 and Figure 10As shown, the explosion-proof valve 8 is integrally formed with the second plate 3. Since the first plate 2 has a positive terminal 4 and a negative terminal 5, the remaining space in the first plate 2 is small. Therefore, placing the explosion-proof valve 8 in the second plate 3 makes it easier to arrange the explosion-proof valve 8 and makes better use of the first plate 2 and the second plate 3.

[0048] It is worth noting that the second plate 3 and the explosion-proof valve 8 are formed by precision die stamping and stretching. Specifically, a weak area can be formed on the second plate 3 to serve as the explosion-proof valve 8.

[0049] It should be noted that in related technologies, the explosion-proof valve 8 is installed by opening vent holes on the plate and then welding the explosion-proof valve 8 to the plate and covering the vent holes. However, in this embodiment, the explosion-proof valve 8 is integrally formed with the second plate 3, which reduces welding processes, lowers production costs, and ensures better consistency when the explosion-proof valve 8 explodes.

[0050] In one embodiment, such as Figure 3 As shown, the first plate 2 and / or the second plate 3 are provided with injection holes 9. That is, the injection holes 9 can be provided on the first plate 2, or on the second plate 3, or both the first plate 2 and the second plate 3 are provided with injection holes 9.

[0051] In one embodiment, the battery has a length of 300mm to 2000mm, a width of 50mm to 200mm, and a thickness of 10mm to 20mm.

[0052] It is worth noting that the positive electrode post 4 is integrally formed with the first plate 2 (either directly molded as a single piece or welded together), and the first plate 2 is integrally formed with the enclosing structure 1 (either directly molded as a single piece or welded together). The positive electrode post 4 and the enclosing structure 1 are conductive, and at this time, the side voltage between the positive electrode post 4 and the enclosing structure 1 is 0V. After the finished battery is manufactured, the negative electrode side voltage can be measured by connecting one end of a multimeter to the negative electrode post 5 and the other end to the enclosing structure 1. For example, in a lithium iron phosphate battery, the negative electrode side voltage is approximately 3.2V.

[0053] It should be noted that the voltage on the negative terminal should usually not be lower than 0.5V, otherwise battery corrosion is likely to occur.

[0054] According to an embodiment of the present invention, another aspect provides a battery pack including the battery described above.

[0055] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that, include: An enclosed structure, wherein both ends of the enclosed structure have openings; The first plate and the second plate are respectively connected to both ends of the enclosing structure and block the corresponding openings. The enclosing structure, the first plate and the second plate enclose and form an accommodating space. A positive terminal and a negative terminal are simultaneously disposed on the first plate, the positive terminal is connected to the first plate, and the negative terminal is insulated from the first plate; An electrode assembly is disposed within the accommodating space. The electrode assembly includes a main body, a positive electrode tab, and a negative electrode tab. The positive electrode tab and the negative electrode tab are respectively connected to both ends of the main body along the length direction. The positive electrode tab is connected to the second plate, and the negative electrode tab is connected to the negative electrode post.

2. The battery according to claim 1, characterized in that, Both the first plate and the second plate are welded to the enclosing structure; or... One of the first plate and the second plate is integrally formed with the enclosing structure, and the other of the first plate and the second plate is welded to the enclosing structure.

3. The battery according to claim 1 or 2, characterized in that, The positive electrode post is a convex structure formed by stamping the first plate towards the side away from the receiving space.

4. The battery according to claim 1 or 2, characterized in that, The first plate has a mounting hole, and the positive electrode post is inserted into the mounting hole and welded to the first plate.

5. The battery according to claim 1 or 2, characterized in that, The battery also includes an end plate, which is disposed between the end of the second plate and the end of the main body connected to the positive electrode tab. The end plate has a through groove and a guide surface. The positive electrode tab passes through the through groove and is bent to be close to or fit against the guide surface. After being bent multiple times, the positive electrode tab is fitted and connected to the second plate.

6. The battery according to claim 1 or 2, characterized in that, The battery also includes an explosion-proof valve, which is disposed on at least one of the first plate, the second plate, and the enclosing structure.

7. The battery according to claim 6, characterized in that, The explosion-proof valve is integrally formed with at least one of the first plate, the second plate, and the enclosing structure.

8. The battery according to claim 1 or 2, characterized in that, The first plate and / or the second plate are provided with injection holes.

9. The battery according to claim 1 or 2, characterized in that, The battery has a length of 300mm to 2000mm, a width of 50mm to 200mm, and a thickness of 10mm to 20mm.

10. A battery pack, characterized in that, The battery includes any one of claims 1 to 9.

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