A lead-acid battery pack and its installation method

Abstract

The present invention discloses a lead-acid battery pack, which includes a first power supply module and a second power supply module. The first power supply module and the second power supply module are connected in series. The voltage of the battery pack is U. The first power supply module includes battery cells, and the number of battery cells in the first power supply module is M. The second power supply module includes battery cells, and the number of battery cells in the second power supply module is N. The sulfuric acid density in the battery cells of the battery pack is ρ. The number of battery cells N in the second power supply module is less than the number of battery cells M in the first power supply module. The lead-acid battery pack of the present invention can improve the battery life.

Description

(1) Technical Field

[0001] The present invention relates to the field of lead-acid batteries. (2) Background Art

[0002] Currently, the lead-acid battery packs used on electric bicycles usually use a group of single batteries connected in series. To ensure the installation efficiency, for example, a 48V 20AH battery pack is formed by connecting 4 12V 20AH batteries in series, with each battery having 6 single cells, and a 60V 20AH battery pack is formed by connecting 5 12V 20AH batteries in series, with each battery having 6 single cells. In the existing design of single batteries, in order to achieve the corresponding voltage, the acid density of the single cell of the battery usually needs to be set at a relatively high level. Currently, the acid density on lead-acid batteries is usually 1.38. However, a relatively high acid density will have an adverse effect on the battery life. Appropriately reducing the acid ratio can significantly improve the battery life. However, reducing the acid ratio will also cause a drop in the battery voltage. If the number of batteries is increased, such as adding 1 12V 20AH battery, it will cause the voltage of the battery pack to rise too high, resulting in problems such as mismatch with the motor power of the electric vehicle. (3) Summary of the Invention

[0003] The present invention discloses a lead-acid battery pack, including a first power supply module and a second power supply module. The first power supply module and the second power supply module are connected in series. The voltage of the battery pack is U. The first power supply module includes battery single cells, and the number of battery single cells in the first power supply module is M. The second power supply module includes battery single cells, and the number of battery single cells in the second power supply module is N. The sulfuric acid density in the battery single cells of the battery pack is ρ, and the number of battery single cells N in the second power supply module is less than the number of battery single cell units M in the first power supply module.

[0004] Further, U / (M + N) - 0.845 < 1.38.

[0005] Further, the number of battery single cells N in the second power supply module is the integer value of (1.38 - ρ)M / (ρ + 0.845).

[0006] Further, the number of single batteries in the first power supply module is X, the number of single batteries in the second power supply module is Y, and M / X > N / Y.

[0007] Further, the number of battery single cells M in the first power supply module is 24, the number of single batteries in the first power supply module is 4, the number of battery single cells N in the second power supply module is 1, and the number of single batteries in the second power supply module is 1.

[0008] Further, the number of battery cells M of the first power supply module is 30, the number of single cells of the first power supply module is 5, the number of battery cells N of the second power supply module is 2, and the number of single cells of the second power supply module is 2.

[0009] Further, the battery cells of the first power supply module and the battery cells of the second power supply module have the same cell voltage and cell capacity.

[0010] The present invention also protects a battery pack, in which a lead-acid battery pack is installed.

[0011] The present invention also protects an electric vehicle, which is equipped with a lead-acid battery pack.

[0012] The present invention also protects an electric vehicle, which is equipped with a battery pack.

[0013] The present invention also protects a lead-acid battery. The number of battery cells of the lead-acid battery is N, and the acid density in a single cell of the lead-acid battery is ρ. The lead-acid battery is used in series with a lead-acid battery having M battery cells and an acid density of ρ in a single cell, and M > N and ρ < 1.38 are satisfied.

[0014] Further, N and M satisfy the following condition: N is equal to the integer part of the value of (1.38 - ρ)M / (ρ + 0.845).

[0015] Further, the lead-acid battery with N battery cells includes Y single cells, and the lead-acid battery with M battery cells includes X single cells, and M / X > N / Y.

[0016] Further, M is 24, the number of single cells of the lead-acid battery with M battery cells is 4, N is 1, and the number of single cells of the lead-acid battery with N battery cells is 1.

[0017] Further, M is 30, the number of single cells of the lead-acid battery with M battery cells is 5, N is 2, and the number of single cells of the lead-acid battery with N battery cells is 2.

[0018] Further, the present invention also protects a method for using a lead-acid battery. The number of battery cells of the lead-acid battery is N, and the acid density in a single cell of the lead-acid battery is ρ. The method includes the following steps: using the lead-acid battery in series with a lead-acid battery having M battery cells and an acid density of ρ in a single cell, and M > N and ρ < 1.38 are satisfied.

[0019] Further, N and M satisfy the following condition: N is equal to the integer part of the value of (1.38 - ρ)M / (ρ + 0.845).

[0020] Further, the lead-acid battery with N battery cells includes Y single cells, and the lead-acid battery with M battery cells includes X single cells, and M / X > N / Y.

[0021] The present invention also protects an installation method of a lead-acid battery pack. The lead-acid battery pack includes a first power supply module and a second power supply module, and the first power supply module and the second power supply module are connected in series. The voltage of the battery pack is U. The first power supply module includes battery cells, and the number of battery cells in the first power supply module is M. The second power supply module includes battery cells, and the number of battery cells in the second power supply module is N. The sulfuric acid density in the battery cells of the battery pack is ρ. The number of battery cells N in the second power supply module is less than the number of battery cells M in the first power supply module. Connect the first power supply module and the second power supply module in series.

[0022] The lead-acid battery pack and its installation method of the present invention can improve the battery life and ensure the installation efficiency. (IV) BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram showing a lead-acid battery pack of the present invention. (V) SPECIFIC EMBODIMENTS

[0024] The present invention will be further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto:

[0025] A lead-acid battery pack 1000 of the present invention includes a first power supply module 100 and a second power supply module 200. The first power supply module 100 and the second power supply module 200 are connected in series (not shown in the figure). The voltage of the lead-acid battery pack 1000 is U. The first power supply module 100 includes battery cells 1, and the number of battery cells in the first power supply module 100 is M. The second power supply module 200 includes battery cells 2, and the number of battery cells in the second power supply module 200 is N. The sulfuric acid density in the battery cells of the first power supply module 100 of the battery pack 1000 is ρ. The number of battery cells N in the second power supply module 200 is less than the number of battery cells M in the first power supply module 100. The voltage U of the lead-acid battery pack 1000, the number of battery cells M in the first power supply module 100, and the number of battery cells N in the second power supply module 200 satisfy the following relationship: U / (M + N) - 0.845 < 1.38. To better match the motor power with the voltage of the battery pack, the number of battery cells N in the second power supply module 200 is preferably the integer value of (1.38 - ρ)M / (ρ + 0.845), and preferably the ceiling method is used for rounding, that is, adding 1 to the integer. Both the first power supply module 100 and the second power supply module 200 may include multiple single batteries. The number of single batteries X in the first power supply module is 10, and the number of single batteries Y in the second power supply module is 20, and M / X > N / Y, which can also achieve the purpose of the present invention. The battery cells 1 of the first power supply module 100 and the battery cells 2 of the second power supply module 200 of the present invention are preferably exactly the same, such as the single-cell voltage, single-cell capacity, single-cell volume, single-cell size, etc. are exactly the same.

[0026] Taking the current nominal 48V 20AH lead-acid battery pack matching an electric vehicle motor power of 400W as an example: The 48V 20AH lead-acid battery pack is composed of 4 series-connected 12V 20AH single batteries. Each single battery has 6 battery cells, for a total of 24 battery cells. The sulfuric acid density in the battery cells, that is, the acid ratio, is 1.38 g / cm 2 , to improve the service life of the 48V 20AH lead-acid battery pack, in the lead-acid battery pack of the present invention, the acid ratio in the original four 12V 20AH single batteries is reduced to 1.33 g / cm 2 , that is, for the first power supply module of the lead-acid battery pack of the present invention, then the second power supply module is connected in series with the first power supply module. The number of battery cells in the second power supply module is (1.38 - 1.33)×24 / (1.33 + 0.845) = 0.551, and the ceiling method gives an integer of 1. The sulfuric acid density in the battery cells, that is, the acid ratio, is 1.33 g / cm 2, at this time, due to the reduction of the acid ratio, the service life of the lead-acid battery pack of the present invention will be significantly improved. In addition, the voltage of the lead-acid battery pack of the present invention at this time is (1.33 + 0.845) * 25 = 54.375V, slightly higher than the voltage value of the lead-acid battery pack when the acid ratio is 1.38, which is (1.38 + 0.845) * 24 = 53.4V, and it can fully match the power of the 400W electric vehicle motor.

[0027] Taking the example of a currently nominal 60V20AH lead-acid battery pack matching an electric vehicle motor power of 500W: The 608V20AH lead-acid battery pack is composed of 5 series-connected 12V20AH single cells. Each single cell has 6 single compartments, for a total of 30 single compartments. The sulfuric acid density in the single compartment, that is, the acid ratio, is 1.38g / cm 2 , in order to improve the service life of the 60V20AH lead-acid battery pack, for the lead-acid battery pack of the present invention, the acid ratio in the original 5 12V20AH single cells is reduced to 1.30g / cm 2 , that is, for the first power supply module of the lead-acid battery pack of the present invention, then the second power supply module is connected in series with the first power supply module. The number of battery single compartments of the second power supply module is (1.38 - 1.30) * 30 / (1.30 + 0.845) = 1.1, and rounding up to the nearest integer is 2. The sulfuric acid density in the single compartment, that is, the acid ratio, is 1.30g / cm 2 , at this time, due to the reduction of the acid ratio, the service life of the lead-acid battery pack of the present invention will be significantly improved. In addition, the voltage of the lead-acid battery pack of the present invention is (1.30 + 0.845) * 32 = 68.64V, slightly higher than the voltage value of the lead-acid battery pack when the acid ratio is 1.38, which is (1.38 + 0.845) * 30 = 66.75V, and it can fully match the power of the 500W electric vehicle motor and the motor controller. The number of single cells of the second power supply module in this embodiment can also be 2, that is, one single cell has one single compartment.

[0028] The single cells of the second power supply module of the present invention can be integrally formed with the single cells of the first power supply module. For example: In the battery pack, the first power supply module has 24 single compartments and 6 single cells, and the second power supply module has 1 single compartment and 1 single cell. The 1 single cell of the second power supply module can be integrally formed with the single cells of the first power supply module, and the battery pack forms 25 single compartments and 6 single cells, where one single cell includes 7 single compartments.

[0029] The present invention also discloses a battery pack, in which the lead-acid battery pack of the present invention is installed. The present invention also discloses an electric vehicle, which is installed with the lead-acid battery pack or battery pack of the present invention.

[0030] The present invention also discloses a lead-acid battery. The number of battery cells in the lead-acid battery is N, and the density of the acid solution in a single cell of the lead-acid battery is ρ, where ρ < 1.38 g / cm 2 , and the lead-acid battery is used in series with a lead-acid battery having M battery cells and a density of the acid solution in a single cell of ρ, and M > N is satisfied. N and M preferably satisfy the following conditions: N is the integer value of (1.38 - ρ)M / (ρ + 0.845), and preferably rounded up. The lead-acid battery with N battery cells may include Y single cells, and the lead-acid battery with M battery cells may include X single cells, and M / X > N / Y, so as to ensure the installation efficiency of the lead-acid battery.

[0031] The present invention also discloses a battery pack, in which the lead-acid battery of the present invention is installed.

[0032] The present invention also discloses an electric vehicle, which is equipped with the lead-acid battery of the present invention and a battery pack equipped with the lead-acid battery of the present invention.

[0033] The present invention also discloses a method for using a lead-acid battery. The number of battery cells in the lead-acid battery is N, and the density of the acid solution in a single cell of the lead-acid battery is ρ, where ρ < 1.38 1.38 g / cm 2 , and the method includes the following steps: the lead-acid battery is used in series with a lead-acid battery having M battery cells and a density of the acid solution in a single cell of ρ, and M > N is satisfied. N and M satisfy the following conditions: N is the integer value of (1.38 - ρ)M / (ρ + 0.845), and preferably rounded up. The lead-acid battery with N battery cells may include Y single cells, and the lead-acid battery with M battery cells may include X single cells, and M / X > N / Y, so as to ensure the installation efficiency of the lead-acid battery.

[0034] The present invention also discloses an installation method for a lead-acid battery pack. The lead-acid battery pack includes a first power supply module and a second power supply module. The first power supply module and the second power supply module are connected in series. The voltage of the battery pack is U. The first power supply module includes battery cells, and the number of battery cells in the first power supply module is M. The second power supply module includes battery cells, and the number of battery cells in the second power supply module is N. The density of sulfuric acid in the battery cells of the battery pack is ρ. The number of battery cells N in the second power supply module is less than the number of battery cells M in the first power supply module. The method includes the following steps: connecting the first power supply module and the second power supply module in series, where U / (M + N) - 0.845 < 1.38, and the number of battery cells N in the second power supply module is the integer value of (1.38 - ρ)M / (ρ + 0.845), preferably rounded up. The number of single cells in the first power supply module is X, and the number of single cells in the second power supply module is Y, and M / X > N / Y.

[0035] The lead-acid battery, lead-acid battery pack and method of the present invention can improve the battery life and ensure the installation efficiency. While reducing the acid ratio to increase the life, the voltage rise can still match the motor and motor controller of the corresponding electric vehicle. In addition, the battery and battery pack protected by the present invention are convenient for transportation, and different battery combinations can also be configured according to the motor power. Even at the same power, different voltages can be selected for configuration to meet different riding needs. In addition, compared with the battery pack under the same voltage with an acid ratio of 1.38, the lead-acid battery pack of the present invention can travel farther and have more power under the same conditions. The lead-acid battery and lead-acid battery pack of the present invention are preferably power batteries, especially power batteries used in electric bicycles.

[0036] The above-described embodiments are only a preferred solution of the present invention and do not impose any form of limitation on the present invention. There are other variations and modifications without exceeding the technical solutions described in the claims.

Claims

1. A lead-acid battery pack, comprising a first power supply module and a second power supply module, the first power supply module and the second power supply module being connected in series. The voltage of the battery pack is U. The first power supply module includes battery cells, the number of battery cells in the first power supply module is M, the number of single cells in the first power supply module is X. The second power supply module includes battery cells, the number of battery cells in the second power supply module is N, the number of single cells in the second power supply module is Y. The sulfuric acid density in the battery cells of the first power supply module and the second power supply module is ρ, characterized in that, The number of battery cells N of the second power supply module is less than the number of battery cells M of the first power supply module. The number of battery cells N of the second power supply module is the ceiling of the value of (1.38 - ρ)M / (ρ + 0.845), and U / (M + N) - 0.845 < 1.38, M / X > N / Y.

2. The lead-acid battery pack according to claim 1, wherein, The number of battery cells M of the first power supply module is 24, the number of single battery cells of the first power supply module is 4, the number of battery cells N of the second power supply module is 1, and the number of single battery cells of the second power supply module is 1.

3. A lead-acid battery pack according to claim 1, characterized in that, The number of battery cells M of the first power supply module is 30, the number of single battery cells of the first power supply module is 5, the number of battery cells N of the second power supply module is 2, and the number of single battery cells of the second power supply module is 2.

4. A lead-acid battery pack according to claim 1, characterized in that, The single battery cell of the second power supply module and the single battery cell of the first power supply module are integrally formed.

5. A lead-acid battery pack according to claim 1, characterized in that, The battery cells of the first power supply module and the battery cells of the second power supply module have the same cell voltage and cell capacity.

6. A battery pack, characterized in that, The battery pack is installed with a lead-acid battery pack as described in claim 1.

7. An electric vehicle, characterized in that, The electric vehicle is installed with a lead-acid battery pack as described in claim 1.

8. An electric vehicle, characterized in that, The electric vehicle is installed with a battery pack as described in claim 6.

9. A lead-acid battery, the number of battery cells of the lead-acid battery being N, the lead-acid battery with the number of battery cells being N comprising Y monomer cells, and the density of the acid solution in a single cell of the lead-acid battery being ρ, characterized in that, The lead-acid battery is used in series with a lead-acid battery having M battery cells and the same acid density ρ in the cell, and M > N, and ρ < 1.

38. N and M satisfy the following conditions: N is the ceiling of the value of (1.38 - ρ)M / (ρ + 0.845). The lead-acid battery with M battery cells includes X single battery cells, and M / X > N / Y. The battery pack formed by the series connection of the lead-acid battery and the lead-acid battery having M battery cells and the same acid density ρ in the cell has a voltage of U, and U / (M + N) - 0.845 < 1.

38.

10. A lead-acid battery according to claim 9, characterized in that, M is 24, the number of single battery cells of the lead-acid battery with M battery cells is 4, N is 1, and the number of single battery cells of the lead-acid battery with N battery cells is 1.

11. A lead-acid battery according to claim 9, characterized in that, M is 30, the number of single battery cells of the lead-acid battery with M battery cells is 5, N is 2, and the number of single battery cells of the lead-acid battery with N battery cells is 2.

12. A battery pack, characterized in that, The battery pack is installed with a lead-acid battery as described in claim 9.

13. An electric vehicle, characterized in that, The electric vehicle is installed with a lead-acid battery as described in claim 9.

14. An electric vehicle, characterized in that, The electric vehicle is installed with a battery pack as described in claim 12.

15. A method for using a lead-acid battery, where the number of battery cells in the lead-acid battery is N, the lead-acid battery with N battery cells includes Y single cells, and the density of the acid solution in a single cell of the lead-acid battery is ρ, characterized in that, It includes the following steps: using in series the lead-acid battery and the lead-acid battery with the number of battery cells being M and the acid density in each cell being ρ, and satisfying M > N and ρ < 1.

38. N and M satisfy the following condition: N is the ceiling of the value of (1.38 - ρ)M / (ρ + 0.845). The lead-acid battery with the number of battery cells being M includes X single cells, and M / X > N / Y. The battery pack formed by connecting in series the lead-acid battery and the lead-acid battery with the number of battery cells being M and the acid density in each cell being ρ has a voltage of U, and U / (M + N) - 0.845 < 1.

38.

16. An installation method of a lead-acid battery pack, the lead-acid battery pack includes a first power supply module and a second power supply module, the first power supply module and the second power supply module are connected in series, the voltage of the battery pack is U, the first power supply module includes battery cells, the number of battery cells in the first power supply module is M, the second power supply module includes battery cells, the number of battery cells in the second power supply module is N, the sulfuric acid density in the battery cells of the first power supply module and the second power supply module is ρ, the number of battery cells N in the second power supply module is less than the number of battery cells M in the first power supply module, and it is characterized in that, Connect the first power supply module and the second power supply module in series. The sulfuric acid density in the battery cells of the first power supply module is ρ, and U / (M + N) - 0.845 < 1.

38. The number of battery cells N of the second power supply module is the ceiling of the value of (1.38 - ρ)M / (ρ + 0.845). The number of single cells of the first power supply module is X, and the number of single cells of the second power supply module is Y, and M / X > N / Y.

Images