Anti-overheating reinforced busbar and lead storage battery

Abstract

The utility model discloses an anti-overheating reinforced busbar and a lead storage battery. The anti-overheating reinforced busbar comprises a long-strip-shaped busbar body, and a heat dissipation groove extending in the axial direction is formed in the top face of the busbar body. According to the anti-overheating reinforced busbar, the heat dissipation groove extending in the axial direction is formed in the top face of the busbar body, on one hand, the heat dissipation face can be improved, the heat dissipation condition of the busbar is improved, on the other hand, the design of the heat dissipation groove is equivalent to the fact that a reinforcing rib is arranged on the busbar, and the overall strength of the busbar can be improved. In addition, the materials in the heat dissipation grooves are distributed to other positions of other busbars, and the overall strength of the busbars can be further enhanced. Or materials at the heat dissipation grooves can be partially saved, and the weight of the busbar can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of lead-acid batteries, and particularly relates to an overheat-proof and strengthened bus bar and a lead-acid battery. Background Art

[0002] The bus bar of a valve-regulated lead-acid battery is an important component inside the lead-acid battery. As the main current collector inside the battery, it is mainly cast and welded together with the individual battery plates during the casting process, thereby connecting the positive and negative plates of each battery, and transmitting the internal current to the external current output terminals of the battery via the bus bar.

[0003] A valve-regulated lead-acid battery includes an internal electrode group and an external plastic case. The lead-acid power battery electrode group is usually composed of 6 electrode groups connected in series through a top bus bar. The voltage of a single electrode group is 2V, and the voltage of the entire electrode group is 12V.

[0004] Taking the new national standard 60V 20Ah battery as an example, the standard-equipped electric vehicle motor is 720W. During the use of the battery vehicle, the current used is 12A, and the starting current is generally about 25A. As the main carrier of current, the bus bar plays an important role in the entire battery. Because the battery current is large and the bus bar is built inside the battery, it is very easy to generate a large amount of Joule heat due to the high current, resulting in an increase in the temperature of the bus bar, thereby affecting the battery life. Therefore, it is crucial to improve the current-carrying capacity of the bus bar.

[0005] For example, the invention application with the publication number CN117559007A discloses a method for detecting and repairing the airtightness of a flat-bridge structure lead-acid battery, which discloses that: the flat-bridge structure lead-acid battery includes a battery case, the battery case includes a case body and a case cover that are covered with each other, the inner cavity of the case body is divided into multiple single cells by a partition plate, each single cell has an electrode group, each electrode group has a positive bus bar connecting positive ear tabs in series and a negative bus bar connecting negative ear tabs in series, each positive and negative bus bar is higher than the mouth of the case body, and when the positive and negative bus bars between adjacent electrode groups are connected in series, they are directly connected across from above the partition plate.

[0006] The material of the bus bar is usually pure refined lead, and its own material is relatively soft. During the battery assembly and use process, due to the small gap between the partition in the battery plastic case and the bus bar, it may cause the bus bar to be squeezed and deformed or even broken. Utility Model Content

[0007] Aiming at the above deficiencies in the prior art, the utility model provides an overheat-proof and strengthened bus bar and a lead-acid battery.

[0008] The present application first provides an overheat-proof and strengthened bus bar, including a long strip-shaped bus bar body, and a heat dissipation groove extending along the axial direction is provided on the top surface of the bus bar body.

[0009] Preferably, the number of the heat dissipation grooves is one arranged along the axial direction of the bus bar body, or multiple ones arranged at intervals along the axial direction and / or the vertical axial direction of the bus bar body.

[0010] Preferably, the length direction of the heat dissipation grooves covers 50% - 90% of the length of the bus bar body, and the depth of the heat dissipation grooves is 15% - 30% of the height of the bus bar body.

[0011] Preferably, the width direction of the heat dissipation grooves covers 20% - 60% of the width of the bus bar body.

[0012] Preferably, the number of the heat dissipation grooves is one arranged along the axial direction of the bus bar body and located in the middle of the top surface of the bus bar body, and the depth of the heat dissipation grooves gradually deepens from both ends to the middle in the length direction.

[0013] Preferably, the height of the bus bar body at both ends in the length direction is small and large in the middle.

[0014] The present application further provides a lead-acid battery, including a battery cell, the inner cavity of the battery cell is divided into multiple single cells by partitions, each single cell is provided with a pole group, each pole group has a positive bus bar and a negative bus bar, and a positive bus bar and a negative bus bar between adjacent pole groups are connected in series in a direct connection manner to form the anti-overheat reinforced bus bar.

[0015] The anti-overheat reinforced bus bar of the present application is provided with heat dissipation grooves extending along the axial direction on the top surface of the bus bar body. On the one hand, it can increase the heat dissipation surface and improve the heat dissipation condition of the bus bar. On the other hand, the design of the heat dissipation grooves is equivalent to setting a reinforcing rib on the bus bar, which can improve the overall strength of the bus bar. In addition, the materials at the heat dissipation grooves are distributed to other positions of other bus bars, which can further enhance the overall strength of the bus bar; or part of the materials at the heat dissipation grooves can be saved, which can reduce the weight of the bus bar. Description of the Drawings

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the anti-overheat reinforced bus bar of the present application.

[0017] Figure 2 It is a sectional structural schematic diagram of the anti-overheat reinforced bus bar of the present application.

[0018] Figure 3 It is a connection structural schematic diagram of the pole group and the bus bar in the lead-acid battery of the present application.

[0019] Figure 4 It is a structural schematic diagram of the bus bar in the lead-acid battery of the present application.

[0020] Reference numerals: bus bar body 1, heat dissipation groove 2, pole group 3. Detailed implementation mode

[0021] As Figures 1 - 2 shown, a heat - proof and enhanced busbar includes a long - strip busbar body 1, and a heat - dissipation groove 2 extending axially is arranged on the top surface of the busbar body 1.

[0022] The number of the heat - dissipation grooves 2 is one arranged axially along the busbar body 1, or multiple ones arranged at intervals axially and / or vertically along the busbar body 1. Preferably, the number of the heat - dissipation grooves 2 is one arranged axially along the busbar body 1. Because the width of the busbar body 1 itself is relatively small, one relatively wide heat - dissipation groove 2 can achieve a good heat - dissipation effect. If the heat - dissipation grooves 2 are replaced by multiple ones arranged at intervals vertically, the width of each one will be relatively small, and the manufacturing difficulty will increase. Moreover, relatively deep but narrow heat - dissipation grooves do not have a very good heat - dissipation effect.

[0023] The length direction of the heat - dissipation groove 2 covers 50% - 90% of the length of the busbar body 1, and the depth of the heat - dissipation groove 2 is 15% - 30% of the height of the busbar body 1. The heat - dissipation groove 2 is arranged in the middle of the busbar body 1 in the length direction. The heat - dissipation effect in the middle is relatively poor, and after adding the heat - dissipation groove 2, the improvement of the heat - dissipation effect is the most obvious.

[0024] The width direction of the heat - dissipation groove 2 covers 20% - 60% of the width of the busbar body 1. When the width of the heat - dissipation groove 2 is relatively narrow, although it can also play a role in heat dissipation, the effect will be relatively poor. If the width of the heat - dissipation groove 2 is too wide, the height of the busbar body 1 will become shorter in most positions, which may not be conducive to the busbar function. Therefore, the width of the heat - dissipation groove 2 should not be too wide.

[0025] In a preferred implementation mode, the number of the heat - dissipation grooves 2 is one arranged axially along the busbar body 1 and is located in the middle of the top surface of the busbar body 1, and the depth of the heat - dissipation groove 2 gradually deepens from both ends to the middle in the length direction. Because the heat dissipation in the middle of the busbar body 1 is difficult, while the heat dissipation at both ends is relatively easy, if the depth of the heat - dissipation groove 2 is designed to gradually deepen from both ends to the middle, it is beneficial to heat dissipation.

[0026] The height of the busbar body 1 in the length direction is smaller at both ends and larger in the middle. That is to say, the thickness of the busbar body 1 in the middle is increased, which is beneficial to the improvement of the strength of the middle area.

[0027] As Figures 3 - 4 shown, a lead - acid battery includes a battery case. The inner cavity of the battery case is divided into multiple single cells by partitions. Each single cell is provided with a pole group 3. Each pole group 3 has a positive - electrode busbar and a negative - electrode busbar. A positive - electrode busbar and a negative - electrode busbar between adjacent pole groups 3 are connected in series in a direct - connection manner to form the heat - proof and enhanced busbar in this application.

[0028] The overheat prevention and enhanced busbar of the present application is provided with heat dissipation grooves extending axially on the top surface of the busbar body. On the one hand, it can increase the heat dissipation surface and improve the heat dissipation of the busbar. On the other hand, the design of the heat dissipation grooves is equivalent to setting a reinforcing rib on the busbar, which can improve the overall strength of the busbar. In addition, the material at the heat dissipation grooves is distributed to other positions of other busbars, which can further enhance the overall strength of the busbar; or part of the material at the heat dissipation grooves can be saved, which can reduce the weight of the busbar.

Claims

1. An overheat-proof reinforced busbar, comprising a long strip-shaped busbar body, characterized in that: The top surface of the bus body is provided with a heat dissipation groove extending along the axial direction; the number of the heat dissipation groove is one arranged along the axial direction of the bus body and located in the middle of the top surface of the bus body, and the depth of the heat dissipation groove gradually deepens from both ends in the length direction to the middle.

2. The overheat-proof reinforced busbar according to claim 1, characterized in that: The number of the heat dissipation grooves is one arranged along the axial direction of the busbar body, or a plurality of heat dissipation grooves arranged at intervals along the axial direction and / or perpendicular to the axial direction of the busbar body.

3. The overheat-proof reinforced busbar according to claim 1, characterized in that: The length direction of the heat dissipation groove covers 50% to 90% of the length of the busbar body, and the depth of the heat dissipation groove is 15% to 30% of the height of the busbar body.

4. The overheat-proof reinforced busbar according to claim 1, characterized in that: The width direction of the heat dissipation groove covers 20% to 60% of the width of the busbar body.

5. The overheat-proof reinforced busbar according to claim 1, characterized in that: The height of the busbar body in the length direction is smaller at both ends and larger in the middle.

6. A lead-acid battery, characterized in that: It comprises a battery slot, the inner cavity of which is divided into a plurality of single cells by partitions, each single cell is provided with a pole group, each pole group has a positive pole bus and a negative pole bus, and a positive pole bus and a negative pole bus between adjacent pole groups are directly connected in series to form an overheat-proof enhanced bus as claimed in any one of claims 1 to 5.

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