Busbar and battery pack structure

Abstract

The utility model provides a busbar and a battery pack structure, and belongs to the technical field of battery packs. The utility model solves the problem that the welding penetration or insufficient welding phenomenon is easy to occur in the assembling process of the existing busbar and the battery cell. The utility model relates to a busbar, which comprises a connecting piece, a mounting cylinder and a clamping cavity, according to the utility model, when the busbar is used, the outer pole columns on the battery cells need to be clamped into the corresponding clamping cavities, and the side surfaces of the outer pole columns can be tightly attached to the inner wall of the mounting cylinder, so that the contact area between the outer pole columns and the mounting cylinder is effectively increased, namely, the contact area between each battery cell and the busbar can be effectively increased; therefore, the current passing capacity of the busbar is effectively improved, and the safety of the battery pack is improved; and secondly, compared with the prior art, the welding process between the battery cell and the busbar can be avoided, so that the success rate of manufacturing the battery pack is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery packs and relates to a busbar and a battery pack structure. Background Art

[0002] A battery bus is a conductive metal strip used to connect battery cells. It can connect battery cells in series or parallel to meet the voltage and capacity requirements of different battery packs. During the assembly process of the bus and battery cells, a commonly used assembly method is to laser weld the bus and battery cells. However, laser welding equipment is expensive, which will increase the production cost of the battery pack. Secondly, welding between the battery cell and the bus often results in weld penetration or cold welding, resulting in a decrease in the success rate of battery pack production. Summary of the Invention

[0003] The purpose of the present invention is to address the above-mentioned problems in the existing technology and to propose a busbar and battery pack structure that avoids the use of welding technology and saves production costs.

[0004] The purpose of the utility model can be achieved through the following technical solutions: A busbar, comprising:

[0005] The connecting piece is provided with mounting tubes on both sides of the connecting piece. Each mounting tube has a card cavity in it. The cross-sectional area of the card cavity in the transverse direction gradually increases from one end of the card cavity to the other end.

[0006] In the above-mentioned busbar, each of the mounting tubes is provided with an opening.

[0007] In the above-mentioned busbar, the inner wall of the card cavity is truncated cone-shaped as a whole, and the outer surface of the mounting tube is truncated cone-shaped or cylindrical as a whole.

[0008] In the above-mentioned busbar, the connecting member includes a buffer plate, and both sides of the buffer plate are connected to the corresponding mounting tubes via connecting plates respectively.

[0009] In the above-mentioned busbar, the cross-sectional shape of the buffer plate may be concave, arc-shaped, V-shaped, or U-shaped.

[0010] In the above-mentioned busbar, the connecting plate and the adjacent mounting cylinder are integrally formed or welded.

[0011] In the above-mentioned busbar, a bent plate is provided on one side of each connecting plate away from the buffer plate, the inner surface of the bent plate is in contact with the outer surface of the mounting tube, and the bent plate is welded to the adjacent mounting tube.

[0012] In the above-mentioned busbar, a side edge of the curved plate away from the buffer plate is flush with an edge of the opening.

[0013] A battery pack structure includes: battery cells and a mounting tube for the above-mentioned busbar, wherein the number of the battery cells is the same as the number of the mounting tubes, each battery cell is provided with an external pole, and each external pole is clamped in the corresponding mounting tube.

[0014] In the above-mentioned battery pack structure, the outer surface of the outer pole sticks to the inner wall of the mounting tube, and there is a squeezing force between the outer pole and the mounting tube.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] In the present invention, when using the busbar, it is necessary to insert the rod-shaped body on the battery cell into the corresponding card cavity, and make the side of the rod-shaped body close to the inner wall of the mounting tube, thereby effectively increasing the contact area between the rod-shaped body and the mounting tube, that is, the contact area between each battery cell and the busbar can be effectively increased, thereby effectively increasing the ability of the busbar to pass current and improving the safety of the battery pack; secondly, compared with the existing technology, it can also avoid the use of welding technology between the battery cell and the busbar, so as to improve the success rate of battery pack production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the assembly diagram of the busbar and battery cells.

[0018] Figure 2 It is a schematic diagram of the structure in which the mounting tube and the connecting piece are integrated.

[0019] Figure 3 It is a structural diagram of the installation tube and the connecting parts using welding.

[0020] Figure 4 It is a schematic diagram of the structure of a busbar with a bent plate. DETAILED DESCRIPTION

[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0022] Example 1

[0023] like Figure 1 — Figure 4 As shown, a busbar of the present invention includes a connector 100 , a mounting tube 200 and a clamping cavity 210 .

[0024] In the present invention, the busbar of the present invention is applied to the battery cells 300 of the battery pack.

[0025] Both sides of the connector 100 are provided with mounting tubes 200, and each mounting tube 200 has a card cavity 210. When using the bus, the rod-shaped body on the battery cell 300 needs to be inserted into the corresponding card cavity 210. Because the cross-sectional area of the card cavity 210 in the transverse direction gradually increases from one end of the card cavity 210 to the other end, when the rod-shaped body is inserted into the corresponding mounting tube 200, there is a certain extrusion force between the mounting tube 200 and the rod-shaped body, so that the rod-shaped body can be stably mounted in the mounting tube 200, and the side of the rod-shaped body can be close to the inner wall of the mounting tube 200, thereby effectively increasing the contact area between the rod-shaped body and the mounting tube 200, that is, the contact area between each battery cell 300 and the bus can be effectively increased, thereby effectively increasing the ability of the bus to pass current and improving the safety of the battery pack.

[0026] The mounting tubes 200 are each provided with an opening 220 .

[0027] Furthermore, the inner wall shape of the card cavity 210 is generally truncated cone-shaped, and the outer surface shape of the mounting tube 200 is generally truncated cone-shaped or cylindrical. Specifically, the rod-shaped body is also truncated cone-shaped. In this way, when the rod-shaped body is inserted into the card cavity 210, the contact mode between the rod-shaped body and the mounting tube 200 will become surface-to-surface contact. Compared with the existing technology, the contact area between the battery cell 300 and the bus is effectively increased, thereby effectively increasing the ability of the bus to pass current.

[0028] The connector 100 includes a buffer plate 110, and the two sides of the buffer plate 110 are connected to the corresponding mounting tubes 200 through connecting plates 120 respectively. When the battery cell 300 expands due to charging and discharging and the distance between the two battery cells 300 increases, the mounting tube 200 is connected to the corresponding rod-shaped body at this time. In this way, the buffer plate 110 will extend to both sides. That is, when the battery cell 300 expands and the distance between the two mounting tubes 200 increases, the buffer plate 110 will find corresponding deformation to buffer the pulling force between the two mounting tubes 200, that is, to buffer the expansion of the battery cell 300 and avoid the busbar from being broken or damaged due to the expansion of the battery cell 300.

[0029] The cross-sectional shape of the buffer plate 110 may be concave, arc-shaped, V-shaped, or U-shaped.

[0030] like Figure 2 — Figure 4As shown, the connecting plate 120 is integrally formed or welded with the adjacent mounting tube 200. When the connecting plate 120 and the mounting tube 200 are integrally formed, technicians can use die-casting or stamping to make the busbar during the process of making the busbar. When the connecting plate 120 and the mounting tube 200 are connected by welding, the mounting tube 200 and the connector 100 can be made first, and then the mounting tube 200 and the connecting plate 120 of the connector 100 are welded together to realize the assembly of the busbar.

[0031] The following is another connection structure between the connecting plate and the mounting tube:

[0032] Each of the connecting plates 120 is provided with a bent plate 121 on one side away from the buffer plate 110, and the inner surface of the bent plate 121 is attached to the outer surface of the mounting tube 200, and the bent plate 121 is welded to the adjacent mounting tube 200. During installation, the outer surface of the mounting tube 200 needs to be attached to the inner surface of the bent plate 121, and the side of the bent plate 121 away from the buffer plate 110 is flush with the edge of the opening 220. Thereafter, the bent plate 121 is welded to the mounting tube 200, and the bent plate 121 and the mounting tube 200 can be assembled together. During use, because the inner wall of the bent plate 121 is in close contact with the outer surface of the mounting tube 200, the contact area between the connecting plate 120 and the mounting tube 200 can be effectively increased, thereby effectively increasing the area for current to pass between the mounting tube 200 and the connecting member 100, that is, effectively increasing the ability of current to pass between the mounting tube 200 and the connecting member 100.

[0033] Example 2

[0034] like Figure 1 As shown, this embodiment applies the busbar in the first embodiment to a battery pack.

[0035] Specifically, a battery pack structure includes: a battery cell 300 and a mounting barrel 200 for a busbar as described above. The number of the battery cells 300 is the same as the number of the mounting barrels 200. Each battery cell 300 is provided with an outer pole 310, wherein the outer pole 310 is the rod-shaped body described above. Each outer pole 310 is clamped in the corresponding mounting barrel 200. The outer surface of the outer pole 310 is attached to the inner wall of the mounting barrel 200. There is an extrusion force between the outer pole 310 and the mounting barrel 200. When multiple When the battery cells 300 are connected in series or in parallel, the battery cells 300 need to be placed side by side and multiple outer poles 310 need to be aligned. After that, the busbar can be installed between the two battery cells 300. Specifically, the outer pole 310 needs to be inserted into the corresponding mounting tube 200, and there needs to be a certain extrusion pressure between the outer pole 310 and the mounting tube 200, so that the outer pole 310 can be stably fixed in the mounting tube 200, thereby realizing the two battery cells 300 being connected in series or in parallel through the busbar.

[0036] Furthermore, when the mounting tube 200 is connected to the corresponding outer pole 310, the opening 220 can smoothly avoid the connection between the outer pole 310 and the battery cell 300, so that the outer pole 310 can be inserted into the mounting tube 200 from top to bottom or from bottom to top relative to the mounting tube 200.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, terms such as "first," "second," and "an" in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0039] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0040] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

Claims

1. A busbar, characterized in that: include: The connecting piece is provided with mounting tubes on both sides of the connecting piece. Each mounting tube has a card cavity in it. The cross-sectional area of the card cavity in the transverse direction gradually increases from one end of the card cavity to the other end.

2. A busbar according to claim 1, characterized in that: Each of the mounting tubes is provided with an opening.

3. The busbar according to claim 1, characterized in that: The inner wall of the card cavity is in the shape of a truncated cone as a whole, and the outer surface of the mounting cylinder is in the shape of a truncated cone or a cylinder as a whole.

4. The busbar according to claim 2, characterized in that: The connecting member includes a buffer plate, and both sides of the buffer plate are connected to the corresponding mounting tubes via connecting plates respectively.

5. The busbar according to claim 4, characterized in that: The cross-sectional shape of the buffer plate may be concave, arc-shaped, V-shaped, or U-shaped.

6. The busbar according to claim 4, characterized in that: The connecting plate and the adjacent mounting cylinder are integrally formed or welded.

7. The busbar according to claim 6, characterized in that: A curved plate is provided on one side of each connecting plate away from the buffer plate. The inner surface of the curved plate sticks to the outer surface of the mounting tube, and the curved plate is welded to the adjacent mounting tube.

8. The busbar according to claim 7, characterized in that: A side edge of the curved plate away from the buffer plate is flush with the edge of the opening.

9. A battery pack structure, characterized in that: include: A battery cell and a busbar mounting barrel according to any one of claims 1 to 8, wherein the number of the battery cells is the same as the number of the mounting barrels, each battery cell is provided with an outer pole, and each of the outer poles is clamped in the corresponding mounting barrel.

10. A battery pack structure according to claim 9, characterized in that: The outer surface of the outer pole sticks to the inner wall of the installation tube, and there is a squeezing force between the outer pole and the installation tube.

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