Battery cover plate assembly, battery and battery pack

Abstract

Battery cover plate assembly comprising: a cover plate body (1) provided with a connection post hole; a terminal post (2) provided at least partially in the terminal post hole; an electrical connector (3) comprising a body portion (301) and a projection portion (302), wherein the projection portion (302) projects toward the cover plate body (1), the body portion (301) is provided around the outer periphery of the projection portion (302), an upper surface of the projection portion (302) is welded to a lower surface of the terminal post (2), and along a first direction (L direction), the length L1 of the projection portion (302) and the length L2 of the body portion (301) satisfy 0.4≤L1 / L2≤1.

Description

TECHNICAL FIELD

[0001] The present utility model relates to the technical field of batteries and in particular to a battery cover plate assembly, a battery and a battery pack. BACKGROUND

[0002] Under the leadership and promotion of domestic and foreign policy programs in the field of new energy, the industrialization of batteries has increased rapidly, and customer requirements for battery packs are also becoming increasingly higher.

[0003] During the battery assembly process, a terminal post and a jelly roll are generally connected by an electrical connector. However, the welding area between the terminal post and the electrical connector is large, and the flatness of the electrical connector is difficult to effectively control, which easily leads to inaccurate soldering and thus causes weld failure, resulting in poor welding quality between the terminal post and the electrical connector. SUMMARY OF THE UTILITY MODEL

[0004] In view of the above, the present utility model provides a battery cover plate assembly, a battery, and a battery pack to solve the problem that the flatness between the terminal post and the electrical connector is difficult to effectively control, thus resulting in poor welding quality.

[0005] According to a first aspect, the present utility model provides a battery cover plate assembly comprising: a cover plate body provided with a terminal post hole; a terminal post provided at least partially in the terminal post hole; an electrical connector including a body portion and a projection portion, wherein the projection portion projects toward the cover plate body, the body portion is provided around the outer periphery of the projection portion, an upper surface of the projection portion is welded to a lower surface of the terminal post, and along a first direction (L direction), the length L1 of the projection portion and the length L2 of the body portion satisfy 0.4≤L1 / L2≤1.

[0006] According to the second aspect, the present utility model also provides a battery comprising: a housing provided with an opening and at least one jelly roll provided in the shell; the battery cover plate assembly as described above, wherein the cover plate body is arranged to cover the opening of the tray and the jelly roll is electrically connected to the terminal post by the electrical connector.

[0007] According to a third aspect, the present utility model further provides a battery pack including at least one battery as described above.

[0008] Advantageous effects: The present utility model adjusts the relationship between the length of the protrusion portion and the length of the body portion of the electrical connector by welding the protrusion portion of the electrical connector to the bottom surface of the terminal post, which makes it easy to control the flatness of the protrusion portion, thereby ensuring the welding quality between the electrical connector and the terminal post, and ensuring the supporting force of the protrusion portion on the terminal post and the overcurrent capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] To better illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings required to describe the specific embodiments or the prior art are briefly presented below. It is understood that the drawings described below represent some embodiments of the present application. A person skilled in the art can derive other drawings based on these drawings without any creative effort. Fig. 1 is a schematic diagram of the structure of a battery cover plate assembly according to an embodiment of the present invention; Fig. 2 is a sectional view of a battery cover plate assembly according to an embodiment of the present invention; Fig. 3 is an enlarged schematic partial view of A in Fig. 2; Fig. 4 is an enlarged schematic partial view of B in Fig. 3; Fig. 5 is an enlarged partial schematic view of a battery cover plate assembly according to another embodiment of the present invention; Fig. Figure 6 is an enlarged partial schematic view of C in Fig. 5; Fig. 7 is an exploded view of the battery cover plate assembly according to an embodiment of the present invention; Fig. 8 is a schematic diagram of the structure of the insulating member according to an embodiment of the present utility model. In the figures:

[0010] 1, cover plate body; 101, fixing groove; 102, flange portion; 103, limit post; 2, terminal post; 3, electrical connector; 301, body portion; 302, protrusion portion; 303, second positioning hole; 304, connecting part; 4, sealing member; 5, insulating member; 501, first positioning hole; 6, reinforcing rib; 7, insulating ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0011] To clarify the purpose, technical solution, and advantages of the embodiment of the present utility model, the technical solution in the embodiment of the present utility model is described clearly and completely below, together with the drawings in the embodiment of the present utility model. It is obvious that the described embodiment is a part of the embodiment of the present utility model, not the entire embodiment. Based on the embodiment of the present utility model, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of the present utility model.

[0012] Embodiments of the present utility model are described below with reference to the Fig. 1 to 8 described.

[0013] According to an embodiment of the present invention, a battery cover plate assembly is provided, which mainly includes: a cover plate body 1, a terminal post 2, an electrical connector 3, a sealing member 4, and an insulating member 5.

[0014] Specifically, the cover plate body 1 is provided with a terminal post hole. The terminal post 2 is at least partially provided in the terminal post hole. The electrical connector 3 includes a body portion 301 and a protrusion portion 302. The protrusion portion 302 protrudes toward the cover plate body 1. The body portion 301 is provided around the outer periphery of the protrusion portion 302. The upper surface of the protrusion portion 302 is welded to the lower surface of the terminal post 2. Along a first direction (L direction), the length L1 of the protrusion portion 302 and the length L2 of the body portion 301 satisfy 0.4≤L1 / L2≤1.

[0015] The battery cover plate assembly according to the embodiment of the present utility model adjusts the relationship between the length of the protrusion portion 302 and the length of the body portion 301 of the electrical connector 3 by welding the protrusion portion 302 of the electrical connector 3 to the lower surface of the terminal post 2, thereby easily controlling the flatness of the protrusion portion 302 to ensure the welding quality between the electrical connector 3 and the terminal post 2, and ensuring the supporting force of the protrusion portion 302 on the terminal post 2 and the overcurrent capacity.

[0016] In particular, as in Fig. 1, the first direction is shown by the arrow L, which is the longitudinal direction of the cover plate body 1, the second direction is shown by the arrow H, which is also the up-down direction, and the third direction is shown by the arrow W. The lower end of the terminal post 2 is installed in the terminal post hole, and the upper end is exposed from the upper surface of the cover plate body 1. As shown in the Fig. 2 and Fig. 7, one end of the body portion 301 is bent downward to form a connecting part 304, and the connecting part 304 is used for welding to the tab of the jelly roll.

[0017] It should be noted that by limiting the relationship between the length of the protruding part 302 and the length of the body portion 301 of the electrical connector 3, the embodiment of the present utility model can prevent L1 / L2 from being too small, which may result in a low supporting force of the protruding part 302 on the terminal post 2 and insufficient overcurrent capacity. At the same time, the embodiment of the present utility model can prevent L1 / L2 from being too large, which may result in difficulty in controlling the flatness of the protruding part 302 and poor welding performance between the terminal post 2 and the protruding part 302.

[0018] It should be noted that the embodiment of the present utility model does not limit the shape of the protruding portion 302, and the protruding portion 302 can be selected from conventional shapes such as round, square, and elliptical as required.

[0019] In one embodiment, as in Fig. 3, the length L2 of the body portion 301 is L2 ≥ 40 mm and satisfies 0.5 ≤ L1 / L2 ≤ 0.9. When the length of the body portion 301 is long, the flatness requirement is high, so that direct welding of the body portion 301 to the terminal post 2 results in poor results. The embodiment of the present utility model uses the protrusion portion 302 with a lower flatness requirement for welding to the lower surface of the terminal post 2, whereby the welding quality between the electrical connector 3 and the terminal post 2 can be ensured, and the supporting force of the protrusion portion 302 to the terminal post 2 and the overcurrent capacity can be ensured.

[0020] In one embodiment, as shown in the Fig. 3 and Fig. 4, the upper surface of the protruding portion 302 does not extend beyond the lower surface of the terminal post 2 along the first direction (L direction). Since the upper surface of the protruding portion 302 does not extend beyond the lower surface of the terminal post 2, the flatness requirement of the protruding portion 302 can be further reduced, and a large space is left on the protruding portion 302 side, so that the sealing member 4 can be more easily compressed, which facilitates the installation of the insulating member 5 and the sealing member 4 and does not interfere with the insulating member 5 and the sealing member 4, thereby improving the sealing performance.In addition, the upper surface of the protrusion portion 302 in the third direction (W direction) may also not extend beyond the lower surface of the terminal post 2, thereby further reducing the requirement for the flatness of the protrusion portion 302.

[0021] Furthermore, in one embodiment, when the upper surface of the protruding portion 302 does not extend beyond the lower surface of the terminal post 2, the length L1 of the protruding portion 302 and the length L2 of the body portion 301 satisfy 0.5≤L1 / L2≤1. Since the upper surface of the protruding portion 302 does not extend beyond the lower surface of the terminal post 2, the supporting force of the protruding portion 302 on the terminal post 2 is relatively small, and the overcurrent capacity is also small. By further adjusting the relationship between the length of the protrusion portion 302 and the length of the body portion 301 of the electrical connector 3, the supporting force of the protrusion portion 302 on the terminal post 2 and the overcurrent capacity are ensured, and the flatness of the protrusion portion 302 is easily controlled to ensure the welding quality between the electrical connector 3 and the terminal post 2.

[0022] In one embodiment, the battery cover plate assembly includes, as shown in the Fig. 3 and Fig. 4, a sealing element 4 is also provided. The sealing element 4 is provided between the terminal post 2 and the terminal post hole. The sealing element 4 is provided between the terminal post 2 and the terminal post hole to play a sealing and insulating role.

[0023] It should be noted that the embodiment of the present utility model does not limit the material of the sealing member 4. For example, the sealing member 4 may be a conventional gasket, such as a fluororubber gasket, a silicone gasket, etc. Furthermore, the material of the insulating ring 7 and the insulating member 5 is not limited. For example, the insulating ring 7 and the insulating member 5 may be made of plastic, with the insulating ring 7 being made of PPS+GF30% (polyphenylene sulfide with 30% glass fiber), and the insulating member 5 being made of PP (polypropylene). The material of the cover plate body 1 is not limited. For example, the cover plate body 1 may be made of aluminum and / or steel.

[0024] Furthermore, in one embodiment, the sealing element 4 is in contact with the terminal post 2 and the electrical connector 3. The sealing element 4 is provided between the terminal post 2 and the electrical connector 3 to achieve sealing and insulation.

[0025] Furthermore, in one embodiment, as shown in Fig. 4, the side of the sealing member 4 is in contact with the peripheral side of the terminal post 2, and the side of the sealing member 4 is also in contact with the side of the protruding portion 302 to achieve an overall seal which has a better sealing effect and can avoid interference.

[0026] In some other embodiments, as shown in the Fig. 5 and Fig. 6, the upper surface of the protruding portion 302 extends beyond the lower surface of the terminal post 2 along the first direction (L direction), which can ensure good overcurrent capacity and support force on the terminal post 2. Specifically, the length L3 of one side of the protruding portion 302 extending beyond the lower surface of the terminal post 2 satisfies 0.5≤L3≤20 mm. If L3 is too large, it is difficult to control the flatness of the protruding portion 302. If L3 is too small, the overcurrent capacity and support force are too low, and it is difficult to meet usage requirements. In addition, the upper surface of the protruding portion 302 can also extend beyond the lower surface of the terminal post 2 in the third direction (W direction) to further ensure good overcurrent capacity and support force on the terminal post 2.

[0027] Furthermore, in one embodiment, when the upper surface of the protruding portion 302 extends beyond the lower surface of the terminal post 2, the length L1 of the protruding portion 302 and the length L2 of the body portion 301 satisfy 0.4≤L1 / L2≤0.9. Since the upper surface of the protruding portion 302 extends beyond the lower surface of the terminal post 2, the flatness requirement is relatively high. By further defining the relationship between the length of the protruding portion 302 and the length of the body portion 301 of the electrical connector 3, the welding flatness can be better controlled to ensure the welding quality between the electrical connector 3 and the terminal post 2, and the supporting force of the protruding portion 302 on the terminal post 2 and the overcurrent capacity can be ensured.

[0028] In one embodiment, as in Fig. 1, a fastening groove 101 is provided on the lower surface of the cover plate body 1 along the first direction (L direction), and a terminal post hole passing through the fastening groove 101 is provided along the second direction (H direction). As shown in the Fig. 3 and Fig. 4, the cover plate body 1 is also provided with a flange portion 102 surrounding the terminal post hole and located inside the cover plate body 1.

[0029] Furthermore, as in Fig. 4, the insulating member 5 is provided in the fastening groove 101 and connected to the flange portion 102, and the insulating member 5 is also provided with a through hole through which the sealing member 4 is passed. The protrusion portion 302 is at least partially provided in the fastening groove 101.

[0030] A fastening groove 101 is provided along the first direction on the lower surface of the cover plate body 1. The fastening groove 101 accommodates the insulating member 5 and the protrusion portion 302, so that the electrical connector 3 and the terminal post 2 can be welded in the fastening groove 101, thereby reducing the space occupied by the electrical connector 3 and the insulating member 5, thus improving space utilization and achieving high energy density. The fastening groove 101 can also confine the insulating member 5. The electrical connector 3 can be installed near the cover plate body 1, and the electrical conduction path between the battery's jelly roll and the terminal post 2 is shortened, which contributes to reducing the temperature rise of the battery.

[0031] Furthermore, as stated in the Fig. 1 and Fig. 4, the battery cover plate assembly also includes an insulating ring 7. The upper end of the terminal post 2 is enclosed by the insulating ring 7, and the terminal post 2 is connected to the flange portion 102 by the insulating ring 7. The upper surface of the flange portion 102 is supported by the insulating ring 7 and the sealing member 4, and the lower surface is supported by the insulating member 5. The insulating ring 7 and the insulating member 5 together have an insulating effect. As shown in the Fig. 3 and Fig. 4, the top surface of the flange portion 102 and the cover plate body 1 also form a receiving groove for receiving the insulating ring 7. The fixing groove 101 covers the electrical connecting piece 3 in the height direction of the cover plate body 1.

[0032] Since the projection portion 302 is welded to the terminal post 2, the insulating member 5 is installed in the fixing groove 101 and abuts against the flange portion 102, so that a gap is provided between the insulating member 5 and the body portion 301.

[0033] In one embodiment, as shown in the Fig. 3 and Fig. 4, a plurality of reinforcing ribs 6 are provided in the part near the sealing member 4 on the underside of the insulating member 5. The plurality of reinforcing ribs 6 are used to melt and fill the gap between the insulating member 5 and the electrical connector 3 when the protrusion portion 302 is welded to the terminal post 2. By providing the plurality of reinforcing ribs 6 in the part near the sealing member 4 on the underside of the insulating member 5, when the protrusion portion 302 is welded to the electrical connector 3, the reinforcing ribs 6 are melted and fill the gap between the insulating member 5 and the body portion 301 of the electrical connector 3, thereby improving the supporting effect of the flange portion 102 and preventing the flange portion 102 from collapsing.

[0034] It should be noted that the embodiment of the present utility model does not limit the structure of the reinforcing rib 6, and any existing structure may be selected as required. For example, as shown in Fig. As shown in Figure 8, the underside of the insulating member 5 is provided with a plurality of annular reinforcing ribs 6 at intervals around the terminal post hole. The reinforcing ribs 6 and the insulating member 5 are integrally formed and are both made of plastic (PP).

[0035] In one embodiment, as in Fig. As shown in Fig. 7, the bottom of the fastening groove 101 is provided with a plurality of limit posts 103 at intervals, and the plurality of limit posts 103 expose the protrusion portion 302. The insulating member 5 is provided with a plurality of first positioning holes 501 corresponding to the plurality of limit posts 103, and the body portion 301 is provided with a plurality of second positioning holes 303 corresponding to the plurality of limit posts 103. The plurality of limit posts 103 are respectively installed in the first positioning hole 501 and the second positioning hole 303 in one-to-one correspondence.

[0036] After the electrical connector 3 is welded to the terminal post 2, the sealing element 4 is compressed between the terminal post 2 and the flange portion 102. The sealing element 4 is elastic and, after compression, exerts a restoring force on the flange portion 102 and the terminal post 2. A plurality of limiting posts 103 are passed through the insulating member 5 and connected to the body portion 301 of the electrical connector 3. These limiting posts can absorb the restoring force of the sealing element 4 and reduce the restoring force of the sealing element 4 acting on the weld between the protrusion portion 302 and the terminal post 2, thereby further improving the welding stability between the protrusion portion 302 and the terminal post 2.The plurality of limit posts 103 may also limit the distance between the flange portion 102 and the body portion 301 to prevent the terminal post 2 from being pushed upward after the sealing element 4 is compressed.

[0037] For example, the mounting groove 101 is a rectangular slot, and a limit post 103 is provided at each of the four corners of the slot bottom. The first positioning hole 501 is a through hole, and the second positioning hole 303 is a blind hole. The limit posts 103 are inserted through the first positioning hole 501 and installed in the second positioning hole 303. The limit posts 103 can be ceramic posts with high strength and insulation.

[0038] In one embodiment, as in Fig. 4, the depth T of the fastening groove 101 is 0.7 mm≤T≤1 mm. For example, the depth T of the fastening groove 101 is 0.7 mm, 0.8 mm, 1 mm, etc. If the depth T of the fastening groove 101 is less than 0.7 mm, the space utilization will not be significantly improved. If the depth T of the fastening groove 101 is greater than 1 mm, the supporting force of the cover plate body 1 will be poor.

[0039] In one embodiment, as in Fig. 4, the height H1 of the protrusion portion 302 is 0.1 mm≤H1≤0.3 mm. For example, the height H1 of the protrusion portion 302 is 0.1 mm, 0.2 mm, 0.3 mm, etc. If the height H1 of the protrusion portion 302 is less than 0.1 mm, it may easily affect the welding of the protrusion portion 302 and the terminal post 2. If the height H1 of the protrusion portion 302 is greater than 0.3 mm, the protrusion portion 302 will occupy a large space.

[0040] According to one embodiment of the present invention, a battery is also provided, including a housing and a battery cover plate assembly. The shell is provided with an opening, and at least one jelly roll is provided in the shell. The cover plate body 1 of the battery cover plate assembly is arranged to cover the opening of the shell, and the jelly roll is electrically connected to the terminal post 2 via the electrical connector 3.

[0041] In the battery according to the embodiment of the present utility model, by welding the protrusion portion 302 of the electrical connector 3 to the lower surface of the terminal post 2, the relationship between the length of the protrusion portion 302 and the length of the body portion 301 of the electrical connector 3 is adjusted so that the flatness of the protrusion portion 302 can be easily controlled, to ensure the welding quality between the electrical connector 3 and the terminal post 2 and to ensure the supporting force of the protrusion portion 302 on the terminal post 2 and the overcurrent capacity.

[0042] In particular, the shell is provided with a cavity inside, the opening is connected to the cavity, and at least one jelly roll is provided in the cavity. The jelly roll is provided with a tab that is welded to the electrical connector 3.

[0043] It should be noted that a pair of terminal posts 2 is provided, including a positive terminal post and a negative terminal post. The electrical connectors 3 each correspond to a terminal post 2. One of the electrical connectors 3 connects the positive terminal post and the positive tab of the jelly roll, and the other of the electrical connectors 3 connects the negative terminal post and the negative tab of the jelly roll.

[0044] As in Fig.As shown in Figure 1, a pair of terminal posts 2 can be installed at opposite ends of the cover plate body 1 as required, or one of the terminal posts 2 can be installed on the cover plate body 1 and the other terminal post 2 can be installed on the shell. The specific arrangement can be selected according to actual needs and is not specifically limited by embodiments of the present invention.

[0045] According to the embodiment of the present utility model, a battery pack is also provided which includes at least one of the batteries as described above.

[0046] Since the battery pack contains the battery as described above, it has the same effect as the battery, which is not repeated here.

[0047] In one embodiment, the battery pack includes a plurality of batteries, and the plurality of batteries may be connected in series to form a battery pack, or in parallel to form a battery pack, or connected in a combination of series and parallel to form a battery pack. This is not specifically limited by embodiments of the present invention.

[0048] Although the embodiment of the present utility model has been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations fall within the scope of the appended claims.

Claims

[1] Battery cover plate assembly comprising: a cover plate body (1) provided with a connection post hole; a terminal post (2) provided at least partially in the terminal post hole; an electrical connector (3) comprising a body portion (301) and a projection portion (302), wherein the projection portion (302) projects toward the cover plate body (1), the body portion (301) is provided around the outer periphery of the projection portion (302), an upper surface of the projection portion (302) is welded to a lower surface of the terminal post (2), and along a first direction (L direction), the length L1 of the projection portion (302) and the length L2 of the body portion (301) satisfy 0.4≤L1 / L2≤1. [2] Battery cover plate arrangement according to claim 1, characterized bythat the length L2 of the body section (301) satisfies L2≥40 mm and 0.5≤L1 / L2≤0.

9. [3] Battery cover plate arrangement according to claim 1, characterized by that along the first direction (direction L) the upper surface of the projection portion (302) does not extend beyond the lower surface of the terminal post (2). [4] Battery cover plate arrangement according to claim 3, characterized by that the length L1 of the projection portion (302) and the length L2 of the body portion (301) satisfy 0.5≤L1 / L2≤1. [5] Battery cover plate arrangement according to claim 3, characterized by that it further comprises a sealing element (4) provided between the terminal post (2) and the terminal post hole. [6] Battery cover plate arrangement according to one of claims 1 to 4, characterized bythat it further comprises a sealing element (4) provided between the terminal post (2) and the terminal post hole, wherein the sealing element (4) is in contact with the terminal post (2) and the electrical connector (3). [7] Battery cover plate arrangement according to claim 1, characterized by that along the first direction (direction L) the upper surface of the projection portion (302) extends beyond the lower surface of the terminal post (2). [8] Battery cover plate arrangement according to claim 7, characterized by that the length L1 of the projection portion (302) and the length L2 of the body portion (301) satisfy 0.4≤L1 / L2≤0.

9. [9] Battery cover plate arrangement according to claim 6, characterized bythat a fastening groove (101) is provided on the lower surface of the cover plate body (1) along the first direction (L direction), and the terminal post hole passing through the fastening groove (101) is provided along the second direction (H direction), and the cover plate body (1) is further provided with a flange portion (102) surrounding the terminal post hole and located inside the cover plate body (1); wherein the battery cover plate assembly further comprises an insulating member (5) provided in the fastening groove (101) and connected to the flange portion (102), wherein the insulating member (5) is also provided with a through-hole through which the sealing member (4) is passed. [10] Battery cover plate arrangement according to claim 9, characterized bythat a plurality of reinforcing ribs (6) are arranged on the underside of the insulating member (5) near the sealing member (4), and the reinforcing ribs (6) are used to melt under heat when the projection portion (302) and the terminal post (2) are welded, and to fill the gap between the insulating member (5) and the body portion (301). [11] Battery cover plate arrangement according to claim 9, characterized byin that a plurality of limit posts (103) are arranged at intervals on the underside of the fastening groove (101), the plurality of limit posts (103) leave the protrusion portion (302) exposed, the insulating member (5) is provided with a plurality of first positioning holes (501) corresponding to the plurality of limit posts (103), the body portion (301) is provided with a plurality of second positioning holes (303) corresponding to the plurality of limit posts (103), and the plurality of limit posts (103) are respectively installed in the first positioning holes (501) and the second positioning holes (303) in a one-to-one correspondence. [12] Battery cover plate arrangement according to claim 9, characterized by that the depth T of the fastening groove (101) satisfies 0.7 mm ≤ T ≤ 1 mm. [13] Battery cover plate arrangement according to claim 9, characterized by that the height H1 of the projection portion (302) satisfies 0.1 mm ≤ H1 ≤ 0.3 mm. [14] Battery comprising: a housing having an opening and at least one jelly roll provided in the housing; A battery cover plate assembly according to any one of claims 1 to 13, wherein the cover plate body (1) is arranged to cover the opening of the housing, and the jelly roll is electrically connected to the terminal post (2) through the electrical connector (3). [15] Battery pack, characterized by that it comprises at least one battery according to claim 14.

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