JP5519371B2 - Reuse method of secondary battery - Google Patents

Description

  The present invention relates to a method for reusing a secondary battery, and more particularly, to a method for reconfiguring a new assembled battery or battery pack by combining secondary batteries collected from a user.

  A battery pack composed of a plurality of secondary batteries is used as a power source for electric vehicles, hybrid vehicles, and the like. On the other hand, from the viewpoint of efficient use of resources, in assembled batteries used as power sources for vehicles, the assembled batteries collected from the user are reconfigured (rebuilt) into reusable assembled batteries and provided to the user again. Reuse technology is also being studied. When rebuilding, in an assembled battery with a history of use, battery characteristics, that is, overcharge, overdischarge, voltage variation due to memory effect, etc. change, so among the secondary batteries constituting a plurality of collected assembled batteries, In particular, it has been proposed to select and rebuild a secondary battery having excellent battery performance.

  In Patent Document 1 below, in a method of reusing a battery pack containing a battery module in which a plurality of cells, which are sealed nickel-metal hydride batteries, are combined, the battery pack has its life determined in the market. A technique is disclosed in which a pack is collected from the market as a battery to be replaced, and the electrolytic solution is re-injected into a battery or a battery module to be subjected to life determination, regenerated, and reassembled into the battery pack. The life judgment is based on whether the internal resistance calculated for each cell or battery module is greater than the specified value, or whether the remaining capacity or voltage variation between cells or battery modules is greater than the specified value. Judge with.

  Further, Patent Document 2 discloses a method of reusing a secondary battery module of a secondary battery system configured to include a secondary battery module, wherein the secondary battery is configured from the secondary battery system. Acquiring at least one battery information selected from the resistance, capacity, battery usage time, resistance change rate, capacity change rate, and battery use strength of the secondary battery module; A step of determining whether or not a preset threshold value has been reached; a step of recovering the secondary battery module when it is determined that the threshold value has been reached; and battery performance based on the battery information of the recovered secondary battery module The step of classifying the secondary battery module recovered by the step, and the secondary battery module recovered from the secondary battery module recovered based on the result of the classification Further comprising the step of applying to a system having operable threshold condition in battery performance at the time of the yield is disclosed.

  Further, in Patent Document 3, a rechargeable secondary battery of itself or another assembled battery stored in a fully discharged state is combined, or a rechargeable secondary battery and a new secondary battery are combined. And reconfiguring a new assembled battery.

JP 2003-17142 A JP 2007-141464 A JP 2009-277627 A

  When battery modules collected from the market are combined at random, the behavior of the battery modules during charge / discharge changes, resulting in large variations in battery characteristics, and the current, voltage, temperature, etc. of the assembled battery obtained by rebuilding the battery module are detected. It will be determined as abnormal by the detection device. For example, when a battery block is composed of a plurality of battery modules and an assembled battery is composed of a plurality of battery blocks, the battery characteristics of the assembled battery are monitored by detecting voltage, temperature, remaining capacity, etc. for each battery block. A battery block B1 is composed of a battery module extracted from the assembled battery A collected from the market, and another battery block B2 is composed of a battery module extracted from another assembled battery B collected from the market. Since the battery block B1 and the battery block B2 have different behaviors, the voltage, temperature, and remaining capacity are different, and it is determined that the battery pack is abnormal due to a large variation in battery characteristics between the battery blocks.

  In addition, when reassembling assembled batteries by selecting only battery modules with uniform battery characteristics, it is necessary to classify each battery module in detail (grading) in order to align the battery characteristics. Then, the battery module which cannot be combined that much will appear, and the reuse rate of a battery module will fall.

  An object of the present invention is to recycle a single battery or a battery module when reusing a single battery or a secondary battery of the battery module constituting the assembled battery (or battery pack) collected from the market. An object of the present invention is to provide a method capable of improving the reuse rate of the battery and making the battery characteristics of the assembled battery uniform.

The present invention relates to a secondary battery recycling method for reconfiguring an assembled battery from a plurality of used battery modules or single cells, and a plurality of used batteries obtained by disassembling a plurality of used assembled batteries. A measurement step for measuring battery characteristics of a battery module or a single battery, a selection step for selecting a reusable battery module based on the battery characteristics measured in the measurement step, and a battery module selected in the selection step When the battery is reconfigured, the original battery pack is reconfigured so that the ratio of the number of the same battery modules is the same for each battery block, which is a unit for detecting the battery characteristics of the battery battery newly reconfigured. And a reconstruction step.

  In one embodiment of the present invention, the battery block is composed of n (n is a natural number of 2 or more) battery modules, and the number of used assembled batteries is m (m is a natural number of 2 or more). In the reconfiguration step, a battery block of a newly reassembled assembled battery is reconfigured by combining one or more battery modules that constitute the m used assembled batteries.

  Further, in another embodiment of the present invention, m = n, and in the reconfiguration step, a battery block of a newly reassembled assembled battery is replaced with a battery module that configures the n used assembled batteries. Each is reconfigured by combining one each.

  In another embodiment of the present invention, the battery block includes two battery modules, and the used assembled battery includes a first assembled battery and a second assembled battery. In the reconfiguration step, The battery block of the assembled battery to be reconfigured is reconfigured by combining one battery module constituting the first assembled battery and one battery module constituting the second assembled battery.

  In another embodiment of the present invention, the battery block includes three battery modules, and the used assembled battery includes a first assembled battery, a second assembled battery, and a third assembled battery. In the configuration step, a battery block of an assembled battery newly reconfigured includes one battery module constituting the first assembled battery, one battery module constituting the second assembled battery, and the third assembled battery. Is reconfigured by combining with one battery module.

The present onset Ming, a recycling method for a secondary battery to reconstruct the battery pack from a plurality of battery modules or battery cells in the used, spent obtained by disassembling a plurality of sets of used batteries A measurement step for measuring the battery characteristics of the plurality of battery modules or single cells, a selection step for selecting a reusable battery module based on the battery characteristics measured in the measurement step, and a battery selected in the selection step When a module is reconfigured using a ranking step that ranks according to the battery characteristics measured in the measurement step, and a battery module that is ranked in the ranking step, the module is newly reconfigured. the battery for each block which is a unit for detecting the battery characteristics of the battery, the rank is reconfigured to the ratio of the number of identical battery modules are the same And a configuration step, the battery block is composed of the battery modules of n (n is a natural number of 2 or more), in the ranking step, the battery module was ranked into n ranks, said reconstruction step Then, the battery block of the assembled battery newly reconfigured is reconfigured by combining one battery module belonging to each rank of the n ranks, and the n battery modules constituting the battery block are The original assembled batteries are different from each other .

  According to the present invention, when reusing a battery module or a single battery secondary battery that constitutes an assembled battery collected from the market and reconfiguring a new battery pack, the recycle rate of the single battery or battery module is reduced. While improving, the battery characteristic of the assembled battery can be equalized.

It is a block diagram of a vehicle on which the assembled battery is mounted. It is a processing flowchart of an embodiment. It is explanatory drawing which shows the rebuilding method of embodiment. It is explanatory drawing which shows the rebuilding method of other embodiment. It is explanatory drawing which shows the rebuilding method of other embodiment. It is explanatory drawing which shows the rebuilding method of other embodiment. It is explanatory drawing which shows the rebuilding method of other embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, a case where a new assembled battery is rebuilt in units of battery modules constituting the assembled battery (or battery pack) will be described, but it may be rebuilt in units of single cells instead of battery modules.

1. First, an assembled battery mounted as a power source for an electric vehicle or a hybrid vehicle will be briefly described as a premise of the present embodiment. The following description is based on an assembled battery configured from a rectangular secondary battery (battery module) having a flat rectangular parallelepiped shape, but the present invention can also be applied to an assembled battery configured from a cylindrical secondary battery. In the following, a nickel metal hydride battery will be described as an example, but other secondary batteries such as a lithium ion battery may be used.

  The assembled battery is configured by electrically connecting a plurality of secondary batteries in series in a state of being constrained by end plates at both ends. Each secondary battery is arranged in parallel with the long side surfaces facing each other, and is electrically connected in series through a connection member. Each secondary battery is a sealed nickel-metal hydride battery made of, for example, a resin-made integral battery case. In the integrated battery case, a plurality of single cells (cells) are connected in series to form a battery module. Moreover, a battery block is comprised from several battery modules, and an assembled battery is comprised from several battery blocks. Each unit cell is, for example, a nickel metal hydride battery, and the capacity of the negative electrode is often set larger than that of the positive electrode at the time of design, that is, in the initial state. The unit cell includes a positive electrode containing nickel hydroxide as a positive electrode active material, a hydrogen storage alloy as a negative electrode active material, and a charge reserve that is an excess capacity provided in advance when the positive electrode is not charged when it is fully charged. And a negative electrode having a discharge reserve corresponding to a previously provided excess capacity in a charged state when the positive electrode finishes discharging, and having a capacity larger than the theoretical capacity of the positive electrode.

  When mounted on a vehicle, the battery pack is monitored by a battery ECU. The battery ECU is configured to include a processor, a ROM, and a RAM, and controls charging / discharging of the assembled battery, and monitors the voltage, current, and temperature of the assembled battery to determine normality / abnormality of the assembled battery.

  FIG. 1 shows a configuration block diagram of a vehicle in which an assembled battery as a secondary battery is mounted as a drive source. In addition, although the hybrid vehicle is illustrated as an onboard vehicle in FIG. 1, it is not limited to this, It can apply to the arbitrary vehicles provided with the motor as a drive source.

  The battery control unit (battery ECU) 20 receives information such as battery voltage and battery temperature from the assembled battery 10, estimates the SOC of the assembled battery 10 at a predetermined control timing, and estimates the estimated SOC, battery voltage, battery temperature, and the like. Is output to the hybrid control unit (HV-ECU) 40. The HV-ECU 40 controls the inverter 50, the driving force distribution mechanism 56, and the engine 60.

  The assembled battery 10 is connected to a motor generator (M / G) 52 via a relay 38 and an inverter 50. The motor generator 52 is connected to the engine 60 via a driving force distribution mechanism 56 including a planetary gear mechanism.

  The temperature sensor 32 is provided for each battery block, and detects the battery temperature of each battery block.

  The voltage detector 34 is provided for each battery block, and detects the terminal voltage of each battery block.

  The current detection unit 36 detects a charge / discharge current flowing through the assembled battery 10.

  The temperature data, the terminal voltage data, and the current data detected by the temperature sensor 32, the voltage detection unit 34, and the current detection unit 36 are supplied to the battery ECU 20 at predetermined sampling periods. The battery ECU 20 estimates the SOC and internal resistance of the battery block that constitutes the assembled battery 10 based on the temperature data, terminal voltage data, and current data supplied from each sensor.

  As described above, the assembled battery 10 is mounted on a vehicle. However, the assembled battery 10 is known to have different battery characteristics depending on the usage history, and even between the individual battery modules constituting the assembled battery, Due to the individual difference, the change mode of the battery characteristics is different. Accordingly, when rebuilding a new assembled battery by combining battery modules constituting a plurality of assembled batteries collected from the market, it is necessary to consider the difference in these battery characteristics.

2. Outline of Rebuilding Next, an outline of rebuilding will be described.

  As described above, when rebuilding, it is necessary to select a battery module in consideration of the difference in battery characteristics and to assemble a new assembled battery with the selected battery module. The battery characteristics used at the time of selection include an open circuit voltage (OCV), an internal resistance, a remaining capacity, a battery mass, and the like. The collected assembled batteries are disassembled in units of battery modules, the battery characteristics of each battery module are measured, and the ranks are divided (graded). Then, battery modules having the same rank (grade) are collected and a new assembled battery is rebuilt. For example, there are assembled batteries A and B collected from the market, a battery module is selected from the assembled battery A, a battery module is selected from the assembled battery B, and these selected battery modules are mixed to rebuild a new assembled battery. If so, a battery module with an approximate OCV is selected and rebuilt.

  However, the assembled battery A and the assembled battery B have different usage histories, so their behaviors are different from each other, and even when the battery characteristics are approximated at the time of rebuilding, the battery characteristics are often different from each other by subsequent use. Therefore, for example, when a battery block is composed of two battery modules and the voltage of the assembled battery is detected in units of battery blocks, a certain battery block B1 is composed of two battery modules selected from the assembled battery A, and another battery. When the block B2 is composed of two battery modules selected from the assembled battery B, and when another battery block B3 is composed of a battery module selected from the assembled battery A and a battery module selected from the assembled battery B, the battery block The behaviors of the voltages detected at B1, B2, and B3 are different, and the variation in voltage between the battery blocks becomes large, so that it is determined that the entire assembled battery is abnormal.

  Therefore, in this embodiment, on the assumption that the assembled batteries collected from the market exhibit different behaviors because of different usage histories, a new assembled battery is rebuilt in consideration of this.

3. Details of Rebuild of Embodiment FIG. 2 shows a flowchart of the rebuild process of this embodiment. First, the assembled battery is collected from the market (S101). Specifically, when an electric vehicle or a hybrid vehicle becomes a scrapped vehicle, the assembled battery mounted on the vehicle is collected. Alternatively, the old assembled battery is recovered when the battery module is replaced with a new assembled battery due to a malfunction of the battery module constituting the assembled battery. When collecting the assembled battery from the market, the life of the assembled battery is determined, but this life determination may be performed by any method. For example, it is determined that the remaining life is short when the voltage variation between the battery blocks is equal to or greater than a specified value. The internal resistance may be calculated for each battery block, and it may be determined that the remaining life is short when the calculated internal resistance is equal to or greater than a specified value.

  Next, the assembled battery collected from the market is disassembled for each battery module, and battery characteristics such as OCV are measured for each battery module (S102). In addition to the OCV, the battery characteristics may be internal resistance, remaining capacity, and the like. When disassembling each battery module, it can be disassembled using a dedicated instrument and is preferably disassembled in a state where a predetermined pressure is applied so as to compress the assembled battery from both ends of the assembled battery.

  After disassembling each battery module and measuring battery characteristics, reusable battery modules are selected (S103). For example, it is determined whether or not the OCV of the battery module is within an allowable range, that is, between the lower limit OCV and the upper limit OCV. If the OCV is between the lower limit OCV and the upper limit OCV, it is determined that the battery module is reusable.

After sorting the battery modules, a new assembled battery is rebuilt with the sorted battery modules (S104). When the battery is rebuilt, the battery block, which is a detection unit for detecting voltage, remaining capacity, temperature, etc., is rebuilt so that the ratio of the number of battery modules with different battery packs is the same. Here, the battery modules having different assembled batteries mean that the assembled batteries originally constituted by the battery modules are different from each other. In the battery block B1 constituting the rebuilt battery pack, if both of the two battery modules constituting the battery block B1 are disassembled from the same battery pack A, the ratio of the number of battery blocks B1 Is 100% for the assembled battery A, and when two battery modules constituting another battery block B2 are disassembled from the same assembled battery B, the ratio of the number of the battery blocks B2 is It is 0% for battery A (100% for battery pack B), and the ratio of the number of battery blocks B1 and battery blocks B2 is not the same. On the other hand, when one of the two battery modules of the battery block B1 is disassembled from the assembled battery A and the other is disassembled from the assembled battery B, the ratio of the number of the battery blocks B1 is the assembled 50% for battery A (50% for battery pack B). In addition, when one of the two battery modules of the battery block B2 is disassembled from the assembled battery A and the other is disassembled from the assembled battery B, the ratio of the number of the battery blocks B2 is assemblage. 50% for battery A (50% for battery pack B), which is the same ratio as battery block B1. In this embodiment, in all the battery blocks which comprise the assembled battery assembled, it adjusts and rebuilds so that the ratio of the number of battery modules with the same assembled battery may become the same. By rebuilding in this way, when battery characteristics such as voltage and remaining capacity are detected for each battery block of the rebuilt battery, the ratio of the number of the same battery modules in the battery pack is the same in any battery block. Therefore, the behavior as a battery block will be made uniform, there will be no variation in battery characteristics between battery blocks, and there will be a large variation between battery blocks as in the past, making it possible to erroneously determine that there is an abnormality. Can be prevented.

Hereinafter, the meaning of “adjusting and rebuilding so that the ratio of the number of battery modules with the same assembled battery is the same ” in this embodiment will be described more specifically.

  In FIG. 3, when the battery block, which is a unit for detecting the battery characteristics of the assembled battery, is composed of two battery modules, a new assembled battery D is obtained from the two assembled batteries A and B collected from the market. It shows about the case of rebuilding.

  In the assembled battery A collected from the market, there can be a reusable battery module and a battery module that is not. In FIG. 3, a battery module indicated by hatching indicates a battery module that cannot be reused due to some problem. First, the assembled battery A is collected and disassembled for each battery module, and battery modules that cannot be reused are excluded. A reusable battery module obtained by disassembling the assembled battery A is shown as a battery module a. The same applies to the assembled battery B collected from the market, and battery modules (battery modules indicated by diagonal lines) that cannot be reused are excluded. A reusable battery module obtained by disassembling the assembled battery B is shown as a battery module b.

  Next, a new assembled battery D is rebuilt from the plurality of battery modules a and the plurality of battery modules b. At this time, the battery block constituting the new assembled battery D is composed of one battery module a constituting the assembled battery A and one battery module b constituting the assembled battery B. The same applies to the other battery blocks. In all the battery blocks, one battery module a and one battery module b are configured. By configuring in this way, all the battery blocks constituting the assembled battery D are composed of the combination of the battery module a and the battery module b, even if the behavior of the battery characteristics of the battery module a and the battery module b are different. Since the battery module a and the battery module b are combined in a battery block unit, the behavior is uniformized in all battery blocks.

  If a certain battery block constituting the assembled battery D is composed of two battery modules a, the behavior of the battery block is different from the behavior of other battery blocks. The same applies to the case where two battery modules b are configured.

  FIG. 4 shows a new assembled battery from three assembled batteries A, B, and C collected from the market when the battery block, which is a unit for detecting the battery characteristics of the assembled battery, is composed of three battery modules. A case where D is rebuilt will be described.

  In the assembled battery A collected from the market, there can be a reusable battery module and a battery module that is not. First, the assembled battery A is collected and disassembled for each battery module, and battery modules that cannot be reused are excluded. A reusable battery module obtained by disassembling the assembled battery A is shown as a battery module a. The same applies to the assembled batteries B and C collected from the market, and reusable battery modules obtained by disassembling the assembled batteries B and C are shown as battery modules b and c, respectively.

  Next, a new assembled battery D is rebuilt from the plurality of battery modules a, the plurality of battery modules b, and the plurality of battery modules c. At this time, the battery block constituting the new assembled battery D is divided into one battery module a constituting the assembled battery A, one battery module b constituting the assembled battery B, and an assembled battery. The battery module c that constitutes C is composed of one unit. The same applies to the other battery blocks. In all the battery blocks, one battery module a, one battery module b, and one battery module c are configured. By configuring in this way, all the battery blocks constituting the assembled battery D are composed of a combination of the battery module a, the battery module b, and the battery module c, and even the battery characteristics of the battery module a, the battery module b, and the battery module c. Even if the behaviors are different from each other, since the behavior of the battery module a, the battery module b, and the battery module c is combined in the battery block unit, the behavior is uniformized in all the battery blocks.

  When there are only two assembled batteries A and B collected from the market, all the battery blocks are configured by one battery module a and two battery modules b. In the block, the number of battery modules of the assembled battery A: the number of battery modules of the assembled battery B = 1: 2, and the behavior can be made uniform. Alternatively, all the battery blocks may be constituted by two battery modules a and one battery module b. Also in this case, in all the battery blocks, the number of battery modules of the assembled battery A: the number of battery modules of the assembled battery B = 2: 1, and the behavior can be made uniform.

  Even when the battery block, which is a unit for detecting the battery characteristics of the assembled battery, is composed of four battery modules, there are several rebuilding methods depending on the number of assembled batteries collected from the market.

  First, when the assembled batteries collected from the market are two assembled batteries A and B, the four battery modules constituting the battery block are composed of one battery module a and three battery modules b. To do. In this case, in all the battery blocks, the number of battery modules of the assembled battery A: the number of battery modules of the assembled battery B = 1: 3, and the behavior can be made uniform. Or you may comprise two battery modules a and two battery modules b. In this case, in all the battery blocks, the number of battery modules of the assembled battery A: the number of battery modules of the assembled battery B = 2: 2, and the behavior can be made uniform. Alternatively, three battery modules a and one battery module b may be configured. In this case, in all the battery blocks, the number of battery modules of the assembled battery A: the number of battery modules of the assembled battery B = 3: 1, and the behavior can be made uniform.

  Second, when there are three assembled batteries A, B, and C collected from the market, one battery module a and one battery module b are used as four battery modules constituting the battery block. One battery module c is composed of two battery modules. In this case, in all the battery blocks, the number of battery modules of the assembled battery A: the number of battery modules of the assembled battery B: the number of battery modules of the assembled battery C = 1: 1: 2 can make the behavior uniform. Similarly, the number of battery modules of the assembled battery A: the number of battery modules of the assembled battery B: the number of battery modules of the assembled battery C = 1: 2: 1, or 2: 1: 1.

  Thirdly, when there are four assembled batteries A, B, C, E collected from the market, one battery module a, b, c, d is provided as each of the battery modules constituting the battery block. Consists of. In this case, the number of battery modules of the assembled battery A: the number of battery modules of the assembled battery B: the number of battery modules of the assembled battery C: the number of battery modules of the assembled battery E = 1: 1: 1: 1 in all the battery blocks. The behavior can be made uniform.

4). Details of Rebuilding in Other Embodiments In this embodiment, battery modules of assembled batteries collected from the market are ranked according to at least one of battery characteristics such as OCV, remaining capacity, internal resistance, and battery mass ( Grade), and reassemble a new assembled battery using the ranked battery modules.

The basic technical idea of the present embodiment is that when an assembled battery is disassembled into battery modules and ranked, the assembled battery can be rebuilt with a battery module with uniform battery characteristics by finely ranking. In view of the fact that many battery modules that cannot be combined are produced and the reuse efficiency is reduced, when ranking, the number of battery modules that make up the battery block that is the detection unit of the assembled battery is focused. The number of battery blocks is divided into ranks. That is, when there are two battery modules constituting the battery block, the battery modules obtained by disassembling are ranked by two ranks. In addition, when there are three battery modules constituting the battery block, the battery modules obtained by disassembly are ranked according to three ranks. Then, by adjusting and rebuilding so that the ratio of the number of battery modules having the same rank is the same , the battery characteristics such as voltage and remaining capacity for each battery block are leveled for the rebuilt battery. This effectively prevents a situation in which an abnormality is erroneously determined due to a large variation between battery blocks.

  Hereinafter, the rebuilding method of the present embodiment will be specifically described.

  FIG. 5 shows an assembled battery when a new assembled battery D is rebuilt from the assembled battery collected from the market when the battery block, which is a unit for detecting the battery characteristics of the assembled battery, is composed of two battery modules. The structure of D is shown. Considering that there are two battery modules constituting the assembled battery D, the battery modules obtained by disassembling the assembled battery are ranked into one of two ranks using the battery characteristics. Let the two ranks be rank 1 and rank 2. Rank 1 is, for example, a battery module in which the OCV of the battery module is greater than or equal to a predetermined value, and rank 2 is a battery module in which the OCV of the battery module is smaller than the predetermined value. When the assembled battery D is rebuilt, one of the two battery modules constituting the battery block is a rank 1 battery module, and the other is a rank 2 battery module. All battery blocks constituting the assembled battery D are composed of rank 1 battery modules and rank 2 battery modules. By configuring in this way, in the battery block which is a unit for detecting the battery characteristics of the assembled battery D, all the battery blocks are composed of combinations of rank 1 battery modules and rank 2 battery modules. Battery characteristics are leveled. Moreover, since the combination of the rank 1 battery module and the rank 2 battery module is used, both the rank 1 and rank 2 battery modules can be efficiently reused.

  FIG. 6 shows a case where a new assembled battery D is rebuilt from the three assembled batteries A, B, and C collected from the market.

  The assembled battery A collected from the market includes a reusable battery module and a non-reusable battery module, and the reusable battery module is ranked into either rank 1 or rank 2. In the figure, the battery module of rank 1 is shown as battery module a1, and the battery module of rank 2 is shown as battery module a2. Similarly, among the assembled batteries B and C collected from the market, the rank 1 battery modules that rank into either rank 1 or rank 2 of the reusable battery modules are designated as battery modules b1 and c1. The battery modules 2 are denoted by b2 and c2.

  Then, when rebuilding a new assembled battery D, one battery module group ranked in rank 1 is extracted, and one battery module group ranked in rank 2 is extracted. A battery block of the assembled battery D is configured. For example, a certain battery block is composed of a rank 1 battery module a1 and a rank 2 battery module b2, and another battery block is composed of a rank 1 battery module c1 and a rank 2 battery module b2, and another battery module. Is composed of a rank 1 battery module b1 and a rank 2 battery module c2. Since all the battery blocks are composed of rank 1 battery modules and rank 2 battery modules, the battery characteristics are leveled. In this case, it does not matter whether the original assembled battery of the rank 1 battery module is A, B, or C, and whether the original assembled battery of the rank 2 battery module is A, B, or C. .

  FIG. 7 shows an assembled battery when a new assembled battery D is rebuilt from the assembled battery collected from the market when the battery block, which is a unit for detecting the battery characteristics of the assembled battery, is composed of three battery modules. The structure of D is shown. In view of the fact that there are three battery modules constituting the assembled battery D, the battery modules obtained by disassembling the assembled battery are ranked into one of three ranks using the battery characteristics. Let the three ranks be rank 1, rank 2, and rank 3. When rebuilding the assembled battery D, one of the three battery modules constituting the battery block is set as a rank 1 battery module, the other is set as a rank 2 battery module, and the remaining one is ranked. 3 battery modules. All the battery blocks constituting the assembled battery D are composed of a rank 1 battery module, a rank 2 battery module, and a rank 3 battery module. With this configuration, in the battery block which is a unit for detecting the battery characteristics of the assembled battery D, all the battery blocks are composed of combinations of rank 1 battery modules, rank 2 battery modules, and rank 3 battery modules. Therefore, the battery characteristics are leveled. Further, since the combination of the rank 1 battery module, the rank 2 battery module, and the rank 3 battery module is used, all of the rank 1, rank 2 and rank 3 battery modules can be efficiently reused.

In this way, the number of battery modules constituting the battery block, which is a unit for detecting battery characteristics, is the same as the rank number, and the battery blocks are configured from battery modules having different ranks. By adjusting the ratio of the number of the same battery modules to be the same, it is possible to eliminate battery module waste while leveling the battery characteristics. In this embodiment, in order to adjust the ratio of the number of battery modules with the same rank to be the same , for example, in the example of FIG. 7, two battery modules with rank 1 and one battery module with rank 3 are arranged in one battery block. Or an aspect in which another battery block is constituted by three rank 1 battery modules is excluded.

  Also in the present embodiment, the original assembled batteries of the battery modules constituting the battery block are basically different from each other. For example, in FIG. 6, the battery modules constituting a certain battery block are the battery module a1 and the battery module b2, but the original assembled battery of the battery module a1 is the assembled battery A, and the original assembled battery of the battery module b2 is The assembled batteries B are different assembled batteries. The battery modules constituting the other battery blocks are the battery module c1 and the battery module b2. The original assembled battery of the battery module c1 is the assembled battery C, and the original assembled battery of the battery module b2 is the assembled battery B. However, the assembled batteries are different from each other.

  On the other hand, when battery modules are ranked into rank 1 and rank 2, for example, all reusable battery packs in battery pack A are ranked in rank 1, and all battery packs that can be reused in battery pack B are all. There is a case where most of the reusable assembled batteries among the assembled batteries C are ranked in rank 1 and a small number of battery modules are ranked in rank 2. In this case, all of the rank 1 battery modules may be extracted from the battery module of the assembled battery A, or may be arbitrarily extracted from the battery modules of the assembled battery A and the assembled battery C. And it may extract from the battery module of the assembled battery B as a battery module of rank 2, and may extract from the battery module of the assembled battery C. As a result, the battery module of the assembled battery C may be extracted as the rank 1 battery module, and the battery module of the same assembled battery C may also be extracted from the rank 2 battery module. That is, the original assembled battery may be the same in any two or more of the battery modules that constitute the battery block.

In the present embodiment, the number of battery modules constituting the battery block that is a unit for detecting battery characteristics is the same as the number of ranks to be ranked, but the battery modules having the same rank in all the battery blocks may be different numbers. It is sufficient to adjust so that the ratio of the numbers is the same, and this aspect is also included in the present invention. For example, when the number of battery modules is 3, ranks are divided into two ranks 1 and 2, and each battery block is composed of two rank 1 battery modules and one rank 2 battery module. One battery module may be composed of one battery module and two rank 2 battery modules. Thereby, the battery characteristic for every battery block can be equalized. Moreover, when the number of battery modules constituting the battery block is two and the number of ranks is five of ranks 1 to 5, two of ranks 1 to 5 (for example, ranks 2 and 5) were selected and rebuilt. A battery may be configured. That is, using the two selected ranks, adjustment is made so that the ratio of the number of battery modules having the same rank is the same in all battery blocks. Thereby, the battery characteristic between battery blocks can be leveled.

  10 battery pack, 20 battery ECU, 40 HV-ECU, 50 inverter.

Claims (6)

A secondary battery recycling method for reconfiguring a battery pack from a plurality of used battery modules or single cells,
A measurement step for measuring battery characteristics of a plurality of used battery modules or single cells obtained by disassembling a plurality of used assembled batteries;
A sorting step of sorting out reusable battery modules based on the battery characteristics measured in the measuring step;
When reconfiguring using the battery modules selected in the selection step, the number of battery modules with the same original assembled battery for each battery block, which is a unit for detecting the battery characteristics of the newly reassembled assembled battery A reconstruction step for reconfiguring so that the ratio of
A method for reusing a secondary battery, comprising: The method of claim 1, wherein
The battery block is composed of n (n is a natural number of 2 or more) battery modules,
The number of used assembled batteries is m (m is a natural number of 2 or more),
In the reconfiguration step, a battery block of a newly reassembled assembled battery is reconfigured by combining one or a plurality of battery modules that constitute the m used assembled batteries. Recycle method of secondary battery. The method of claim 2, wherein
m = n,
In the reconfiguration step, the battery block of the newly reassembled assembled battery is reconfigured by combining one each from the battery modules constituting the n used assembled batteries. How to reuse the next battery. The method of claim 3, wherein
The battery block is composed of two battery modules,
The used assembled battery includes a first assembled battery and a second assembled battery,
In the reconfiguration step, the battery block of the newly reconfigured assembled battery is recombined by combining one battery module constituting the first assembled battery and one battery module constituting the second assembled battery. A method for reusing a secondary battery, comprising: The method of claim 3, wherein
The battery block is composed of three battery modules,
The used assembled battery includes a first assembled battery, a second assembled battery, and a third assembled battery,
In the reconfiguration step, a battery block of the assembled battery newly reconfigured includes one battery module constituting the first assembled battery, one battery module constituting the second assembled battery, and the third A method of reusing a secondary battery, comprising recombining with one battery module constituting an assembled battery. A secondary battery recycling method for reconfiguring a battery pack from a plurality of used battery modules or single cells,
A measurement step for measuring battery characteristics of a plurality of used battery modules or single cells obtained by disassembling a plurality of used assembled batteries;
A sorting step of sorting out reusable battery modules based on the battery characteristics measured in the measuring step;
A ranking step for ranking the battery modules sorted in the sorting step according to the battery characteristics measured in the measurement step;
When reconfiguring using the battery modules ranked in the ranking step, the number of battery modules having the same rank is determined for each battery block, which is a unit for detecting the battery characteristics of the newly assembled battery. A reconstruction step to reconfigure the ratios to be the same;
Equipped with a,
The battery block is composed of n (n is a natural number of 2 or more) battery modules,
In the ranking step, the battery module is ranked into n ranks,
In the reconfiguration step, a battery block of a newly reconfigured assembled battery is reconfigured by combining one battery module belonging to each rank of the n ranks,
The n battery modules constituting the battery block are different from each other in the original assembled battery .

Images