A pulse charge and discharge durability test unit, device, and vehicle test system

Abstract

An embodiment of the present application provides a pulse charge and discharge durability test unit, a device, and an automotive test system. Among them, the pulse charge and discharge durability test unit includes: a battery branch formed by connecting a plurality of battery modules in series, and a pulse power supply; each battery module includes: a first battery and a second battery; the first battery and the second battery are connected in series through electrodes with the same name to form the battery module; the battery branch is connected in parallel with the pulse power supply. By implementing the embodiment of the present application, since the pulse polarization voltage is usually only about 10% of the open-circuit voltage, the output voltage requirement of the pulse charge and discharge durability test device will be reduced to about 10% of the conventional scheme, which can reduce the test cost.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a pulse charge and discharge durability test unit, a device, and an automotive test system. Background Art

[0002] In the durability test of power battery life, in order to reduce the test cost and cycle, the battery cells are usually connected in series for charge and discharge life durability test (as shown in Figure 1 ), but limited by the output voltage of the charge and discharge equipment, the number of battery cells connected in series in a single test is generally 2 to 3, and the test cost is high. For example, a DC charge and discharge cabinet for battery cells of a 9V / 500A specification costs about 8 to 12 yuan per hour, and 2 battery cells can be connected in series in a single test. The cost of the pulse durability equipment for a single battery cell is about 4,000 yuan. During the battery development process, pulse durability tests on hundreds of battery cells are usually required, and the overall test cost of the battery cells is as high as hundreds of thousands of yuan.

[0003] In summary, in the existing series pulse durability mode, the number of battery cell samples that can be executed simultaneously is limited and the test cost is high. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a pulse charge and discharge durability test unit, a device, and an automotive test system to reduce the test cost.

[0005] In a first aspect, the embodiments of the present application provide a pulse charge and discharge durability test unit, including:

[0006] A battery branch formed by connecting multiple battery modules in series, and a pulse power supply;

[0007] Each battery module includes: a first battery and a second battery;

[0008] The first battery and the second battery are connected in series through the same-named electrodes to form the battery module;

[0009] The battery branch is connected in parallel with the pulse power supply.

[0010] In the above implementation process, since each battery module includes: a first battery and a second battery; the first battery and the second battery are connected in series through the same-named electrodes to form the battery module; the battery branch is connected in parallel with the pulse power supply, there is a polarization internal resistance in the battery cells, a polarization voltage is generated at both ends of the battery module, and the voltage at the positive end of the branch is the sum of the polarization voltages generated at both ends of all battery modules in the battery branch. Since the pulse polarization voltage is usually only about 10% of the open-circuit voltage. Therefore, the output voltage requirement of the pulse charge and discharge durability test device will be reduced to about 10% of the conventional scheme. Based on the above embodiments, the test cost can be reduced.

[0011] Further, the positive electrode of the first battery and the positive electrode of the second battery are connected to form the battery module.

[0012] In the above implementation process, since the positive electrode of the first battery and the positive electrode of the second battery are connected to form the battery module, the battery cells have polarization internal resistance, a polarization voltage is generated across the battery module, and the voltage at the positive end of the branch is the sum of the polarization voltages generated across all battery modules in the battery branch. Since the pulsed polarization voltage is usually only about 10% of the open-circuit voltage. Therefore, the output voltage requirement of the pulsed charge and discharge durability test device will be reduced to about 10% of the conventional scheme, which can reduce the test cost.

[0013] Further, the negative electrode of the first battery and the negative electrode of the second battery are connected to form the battery module.

[0014] In the above implementation process, since the negative electrode of the first battery and the negative electrode of the second battery are connected to form the battery module, the battery cells have polarization internal resistance, a polarization voltage is generated across the battery module, and the voltage at the positive end of the branch is the sum of the polarization voltages generated across all battery modules in the battery branch. Since the pulsed polarization voltage is usually only about 10% of the open-circuit voltage. Therefore, the output voltage requirement of the pulsed charge and discharge durability test device will be reduced to about 10% of the conventional scheme.

[0015] In a second aspect, an embodiment of the present application provides a pulsed charge and discharge durability test device, including:

[0016] A battery management system, a charge and discharge cabinet, and a battery branch formed by connecting a plurality of battery modules in series;

[0017] Each battery module includes: a first battery and a second battery;

[0018] The first battery and the second battery are connected in series through the same-named electrodes to form the battery module;

[0019] The battery management system is connected to the charge and discharge cabinet;

[0020] The battery management system includes: a first voltage detection point and a second voltage detection point;

[0021] The charge and discharge cabinet includes: a first channel and a second channel;

[0022] The series connection point between the first battery and the second battery in each battery module is connected to the second voltage detection point and the first channel;

[0023] Both ends of each battery module are connected to the first voltage detection point and the first channel;

[0024] The first end of each battery module is connected to the first connection point of the second channel;

[0025] The second end of each battery module is connected to the second connection point of the second channel.

[0026] In the above implementation process, the battery management system can measure the voltage between the first battery and the second battery in each battery module. Further, the charging and discharging test can be realized by controlling the on / off of the corresponding branch to charge each battery module, each first battery and each second battery.

[0027] Further, the first end of each battery module and the first channel are connected through a first switch.

[0028] In the above implementation process, the connection between the first end of each battery module and the first channel can be realized by controlling the first switch.

[0029] Further, the second end of each battery module and the first channel are connected through a second switch.

[0030] In the above implementation process, the connection between the first channel and the second end of each battery module can be controlled by the second switch.

[0031] Further, the series connection point between the first battery and the second battery in each battery module is connected to the second channel through a third switch.

[0032] In the above implementation process, the connection between the series connection point and the second channel can be controlled by the third switch.

[0033] Further, the positive electrode of the first battery and the positive electrode of the second battery are connected to form the battery module.

[0034] Further, the negative electrode of the first battery and the negative electrode of the second battery are connected to form the battery module.

[0035] In a third aspect, an embodiment of the present application provides an automotive test system, including the pulse charge and discharge durability test device described in the second aspect.

[0036] In the above implementation process, since each battery module includes: a first battery and a second battery; the first battery and the second battery are connected in series through electrodes with the same name to form the battery module; the battery branch is connected in parallel with the pulse power supply, and there is a polarization internal resistance in the battery cells, a polarization voltage is generated at both ends of the battery module, and the voltage at the positive end of the branch is the sum of the polarization voltages generated at both ends of all battery modules in the battery branch. Since the pulsed polarization voltage is usually only about 10% of the open-circuit voltage. Therefore, the output voltage requirement of the pulsed charge and discharge durability test device will be reduced to about 10% of the conventional scheme. Based on the above embodiments, the test cost can be reduced.

[0037] Other features and advantages of the present application will be described in the following specification, or, some features and advantages can be inferred from the specification or determined without doubt, or can be obtained by implementing the above technologies disclosed in the present application.

[0038] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] To more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0040] Figure 1 Schematic structural diagram of the pulsed charge and discharge durability test unit provided by the embodiment of the present application;

[0041] Figure 2 Another schematic structural diagram of the pulsed charge and discharge durability test unit provided by the embodiment of the present application;

[0042] Figure 3 Schematic structural diagram of the pulsed charge and discharge durability test device provided by the embodiment of the present application;

[0043] Figure 4 Another schematic structural diagram of the pulsed charge and discharge durability test device provided by the embodiment of the present application.

[0044] Icon: 1 - Battery branch; 2 - Pulse power supply; 11 - First battery module; 12 - Second battery module; 13 - Nth battery module; 3 - Battery management system; 31 - First voltage detection point; 32 - Second voltage detection point; 4 - Charge and discharge cabinet; 41 - First channel; 42 - Second channel; S5 - Fifth sub-switch; S6 - Sixth sub-switch; S7 - Seventh sub-switch; S8 - Eighth sub-switch; S9 - Ninth sub-switch; S10 - Tenth sub-switch; Sn-1 - (N-1)th sub-switch, Sn - Nth sub-switch; Sn+1 - (N+1)th sub-switch; B1 - First battery of the first battery module; B2 - Second battery of the second battery module; B3 - First battery of the second battery module; B4 - Second battery of the second battery module; Bn-1 - First battery of the Nth battery module; Bn - Second battery of the Nth battery module. Detailed implementation mode

[0045] Next, the technical solutions in the embodiments of the present application will be described in conjunction with the accompanying drawings in the embodiments of the present application.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0047] Embodiment 1

[0048] See Figure 1 、 Figure 2 , the embodiment of the present application provides a pulse charge and discharge durability test device, including:

[0049] A battery branch 1 formed by connecting multiple battery modules in series and a pulse power supply 2;

[0050] Specifically, Figure 1 - Figure 2 The battery branches in

[0051] respectively include: a first battery module 11 and an Nth battery module 13;

[0052] Each battery module includes: a first battery and a second battery;

[0053] The first battery module includes: the first battery B1 of the first battery module; the second battery B2 of the first battery; the second battery module includes: the Nth battery module includes: the first battery Bn-1 of the Nth battery module; the first battery Bn of the Nth battery module;

[0054] The first battery and the second battery are connected in series through the same-named electrodes to form a battery module;

[0055] In the above implementation process, since each battery module includes: a first battery and a second battery; the first battery and the second battery are connected in series through electrodes with the same name to form a battery module; the battery branch 1 is connected in parallel with the pulse power supply 2, and there is a polarization internal resistance in the battery cells, a polarization voltage is generated across the battery module, and the voltage at the positive end of the branch is the sum of the polarization voltages generated across all battery modules in the battery branch 1. Since the pulse polarization voltage is usually only about 10% of the open-circuit voltage. Therefore, the output voltage requirement of the pulse charge and discharge durability test device will be reduced to about 10% of the conventional scheme. Based on the above embodiments, the test cost can be reduced.

[0056] Further, referring to Figure 1 , the positive electrode of the first battery is connected to the positive electrode of the second battery to form a battery module.

[0057] Each battery module is connected in series with other battery modules through the negative electrodes of the first battery and the second battery.

[0058] In the above implementation process, since the positive electrode of the first battery is connected to the positive electrode of the second battery to form a battery module, there is a polarization internal resistance in the battery cells, a polarization voltage is generated across the battery module, and the voltage at the positive end of the branch is the sum of the polarization voltages generated across all battery modules in the battery branch 1. Since the pulse polarization voltage is usually only about 10% of the open-circuit voltage. Therefore, the output voltage requirement of the pulse charge and discharge durability test device will be reduced to about 10% of the conventional scheme.

[0059] Further, referring to Figure 2 , the negative electrode of the first battery is connected to the negative electrode of the second battery to form a battery module.

[0060] Each battery module is connected in series with other battery modules through the positive electrodes of the first battery and the second battery.

[0061] In the above implementation process, since the negative electrode of the first battery is connected to the negative electrode of the second battery to form a battery module, there is a polarization internal resistance in the battery cells, a polarization voltage is generated across the battery module, and the voltage at the positive end of the branch is the sum of the polarization voltages generated across all battery modules in the battery branch 1. Since the pulse polarization voltage is usually only about 10% of the open-circuit voltage. Therefore, the output voltage requirement of the pulse charge and discharge durability test device will be reduced to about 10% of the conventional scheme.

[0062] Embodiment 2

[0063] Referring to Figure 3 、 Figure 4 , the embodiment of the present application provides a pulse charge and discharge durability test device, and the device includes: a battery management system 33, a charge and discharge cabinet 4, and a battery branch 1 formed by connecting a plurality of battery modules in series;

[0064] Specifically, the battery branches respectively include: the first battery module 11, the second battery module 12, and the Nth battery module 13;

[0065] Each battery module includes: a first battery and a second battery;

[0066] The first battery module includes: the first battery B1 of the first battery module; the second battery B2 of the first battery; the second battery module includes: the first battery B3 of the second battery module; the second battery B4 of the first battery... The Nth battery module includes: the first battery Bn-1 of the Nth battery module; the first battery Bn of the Nth battery module;

[0067] The first battery and the second battery are connected in series through the same-named electrodes to form the battery module;

[0068] The battery management system 3 is connected to the charge and discharge cabinet;

[0069] The battery management system 3 includes: a first voltage detection point 31 and a second voltage detection point 32;

[0070] The charge and discharge cabinet includes: a first channel 41, a second channel 42;

[0071] The series connection point between the first battery and the second battery in each battery module is connected to the second voltage detection point 32 and the first channel 41;

[0072] Both ends of each battery module are connected to the first voltage detection point 31 and the first channel 41;

[0073] The first end of each battery module is connected to the first connection point of the second channel 42;

[0074] The second end of each battery module is connected to the second connection point of the second channel 42.

[0075] In the above implementation process, through the battery management system 3, the voltage measurement between the first battery and the second battery in each battery module can be realized. Further, the charge and discharge of each battery module, each first battery, and each second battery can be carried out by controlling the on / off of the corresponding branch, realizing the charge and discharge test.

[0076] Further, referring to Figure 3 - Figure 4 , the positive electrode of the first battery is connected to the positive electrode of the second battery to form a battery module. Based on the above embodiments, the test cost can be reduced.

[0077] Each battery module is connected in series with other battery modules through the negative electrodes of the first battery and the second battery.

[0078] In the above implementation process, since the positive electrodes of the first battery and the second battery are connected to form a battery module, the battery cells have polarization internal resistance, a polarization voltage is generated across the battery module, and the voltage at the positive end of the branch is the sum of the polarization voltages generated across all the battery modules in Battery Branch 1. Since the pulsed polarization voltage is usually only about 10% of the open-circuit voltage. Therefore, the output voltage requirement of the pulsed charge and discharge endurance test device will be reduced to about 10% of the conventional scheme.

[0079] Further, referring to Figure 3 - Figure 4 , the negative electrodes of the first battery and the second battery are connected to form a battery module.

[0080] Each battery module is connected in series with other battery modules through the positive electrodes of the first battery and the second battery.

[0081] In the above implementation process, since the negative electrodes of the first battery and the second battery are connected to form a battery module, the battery cells have polarization internal resistance, a polarization voltage is generated across the battery module, and the voltage at the positive end of the branch is the sum of the polarization voltages generated across all the battery modules in Battery Branch 1. Since the pulsed polarization voltage is usually only about 10% of the open-circuit voltage. Therefore, the output voltage requirement of the pulsed charge and discharge endurance test device will be reduced to about 10% of the conventional scheme.

[0082] Further, the first end of each battery module is connected to the first channel 41 through a first switch.

[0083] Referring to Figure 3 - Figure 4 , the first switch includes: a first sub-switch S1, a fifth sub-switch S5, and an (n - 1)th sub-switch Sn - 1.

[0084] In the above implementation process, the connection between the first end of each battery module and the first channel 41 can be achieved by controlling the first switch.

[0085] Further, the second end of each battery module is connected to the first channel 41 through a second switch.

[0086] Referring to Figure 3 - Figure 4 , the second switch includes: a third sub-switch S3 and an (n + 1)th sub-switch Sn + 1.

[0087] In the above implementation process, the connection between the first channel 41 and the second end of each battery module can be controlled by the second switch.

[0088] Further, the series connection point between the first battery and the second battery in each battery module is connected to the second channel 42 through a third switch.

[0089] Referring to Figure 3 - Figure 4, the third switch includes: a sixth sub-switch S6, a seventh sub-switch S7, an eighth sub-switch S8, a ninth sub-switch S9, and a tenth sub-switch S10.

[0090] Further, the series connection point between the first battery and the second battery in each battery module is connected to the first channel 41 through the third switch.

[0091] See Figure 3 - Figure 4 , the fourth switch includes: a second sub-switch S2, a fourth sub-switch S4, and an nth sub-switch Sn.

[0092] In the above implementation process, the connection between the series connection point and the second channel 42 can be controlled through the third switch.

[0093] Further, the battery management system 3 and the charge and discharge cabinet 4 are connected through a communication line.

[0094] Further, the first channel 41 includes: a third connection point and a fourth connection point;

[0095] The series connection point between the first battery and the second battery in each battery module is connected to the third connection point;

[0096] Both ends of each battery module are connected to the third connection point.

[0097] Embodiment 3

[0098] Based on Figure 3 , Figure 4 The pulse charge and discharge durability test device shown, an embodiment of the present application provides a charge and discharge test method, including:

[0099] Close the first sub-switch S1 and the second sub-switch S2. The battery charge and discharge management system collects the first battery voltage of the first battery B1 in the first battery module, calculates the SOC, and the first channel 41 in the charge and discharge cabinet adjusts the target SOC of the first battery B1 in the first battery module;

[0100] Open the first sub-switch S1, close the third sub-switch S3. The battery charge and discharge management system collects the voltage of the second battery B2 in the first battery module, calculates the SOC, and the first channel 41 in the charge and discharge cabinet adjusts the target SOC of the second battery B2 in the first battery module;

[0101] Open the second sub-switch S2, close the fourth sub-switch S4. The battery charge and discharge management system collects the voltage of the first battery B3 in the second battery module, calculates the SOC, and the first channel 41 in the charge and discharge cabinet adjusts the target SOC of the first battery B3 in the second battery module;

[0102] Disconnect the third sub-switch and close the fifth sub-switch. The battery charge and discharge management system collects the voltage of the second battery B4 in the second battery module of the battery, calculates the SOC, and the first channel 41 in the charge and discharge cabinet adjusts the target SOC of the second battery B4 in the second battery module.

[0103] Close the (N - 1)th sub-switch Sn-1 and the Nth sub-switch SN. The battery charge and discharge management system collects the voltage of the first battery Bn-1 in the Nth battery module of the battery, calculates the SOC, and the first channel 41 in the charge and discharge cabinet adjusts the target SOC of the first battery Bn-1 in the Nth battery module.

[0104] Disconnect the (N - 1)th sub-switch SN-1 and close the (N + 1)th sub-switch SN+1. The battery charge and discharge management system collects the voltage of the second battery Bn in the Nth battery module of the battery, calculates the SOC, and the first channel 41 in the charge and discharge cabinet adjusts the target SOC of the second battery Bn in the Nth battery module.

[0105] Disconnect the Nth sub-switch SN and the (N + 1)th sub-switch SN+1, and close the sixth sub-switch S6 and the eighth sub-switch S8. The second channel 42 in the charge and discharge cabinet performs positive and negative pulse heating on the first battery module 11 for T1 seconds and then stands still.

[0106] Disconnect the sixth sub-switch S6 and close the eighth sub-switch S8. The second channel 42 in the charge and discharge cabinet performs positive and negative pulse heating on the second battery module 12 for T2 seconds and then stands still.

[0107] Close the ninth sub-switch S9 and the tenth sub-switch S10. The second channel 42 in the charge and discharge cabinet performs positive and negative pulse heating on the Nth battery module 13 for Tn / 2 seconds.

[0108] When the cumulative standing time of the Nth battery module 13 reaches the preset time length and the cumulative heating time reaches the target value, stop the test.

[0109] Embodiment 3

[0110] The embodiment of the present application provides an automotive test system, including the pulse charge and discharge durability test device of Embodiment 1.

[0111] In the above implementation process, since each battery module includes: a first battery and a second battery; the first battery and the second battery are connected in series through the same-named electrodes to form a battery module; the battery branch 1 is connected in parallel with the pulse power supply 2, and there is a polarization internal resistance in the battery cell, and a polarization voltage is generated at both ends of the battery module. The voltage at the positive end of the branch is the sum of the polarization voltages generated at both ends of all battery modules in the battery branch 1. Since the pulse polarization voltage is usually only about 10% of the open-circuit voltage. Therefore, the output voltage requirement of the pulse charge and discharge durability test device will be reduced to about 10% of the conventional scheme.

[0112] The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

[0113] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

Claims

1. A pulse charge and discharge durability test device, characterized in that, The device includes: a battery management system, a charge and discharge cabinet, and a battery branch formed by connecting multiple battery modules in series; Each of the battery modules includes: a first battery and a second battery; the first battery and the second battery are connected in series through electrodes of the same name to form the battery module; The battery management system is connected to the charge and discharge cabinet; The battery management system includes: a first voltage detection point and a second voltage detection point; The charge and discharge cabinet includes: a first channel and a second channel, the first channel is used to adjust the target SOC of the first battery and the second battery of each battery module, and the second channel is used to perform pulse charge and discharge on each battery module; The first end of each battery module is connected to the first connection point of the second channel, and the second end of each battery module is connected to the second connection point of the second channel; The series connection point between the first battery and the second battery in each battery module is connected to the second voltage detection point and the first connection point of the first channel through a fourth switch; The first end of each battery module is connected to the first voltage detection point and the second connection point of the first channel through a second switch, and the second end of each battery module is connected to the first voltage detection point and the second connection point of the first channel through a first switch.

2. The pulse charge and discharge durability test device according to claim 1, wherein The positive electrode of the first battery and the positive electrode of the second battery are connected to form the battery module.

3. The pulse charge and discharge durability test device according to claim 1, characterized in that, The negative electrode of the first battery and the negative electrode of the second battery are connected to form the battery module.

4. An automotive test system, characterized in that, It includes the pulse charge and discharge durability test device according to any one of claims 1-3.

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