CN205910325U - Voltage supervision device and vehicle of battery module - Google Patents

Abstract

The utility model provides a voltage supervision device and vehicle of battery module belongs to the battery management technology field. The utility model discloses an in the voltage supervision device, based on the discharge multiplexing partial resistance value in the adjacent arbitrary cell's of return circuit and this cell or this cell voltage acquisition return circuit of every cell's of being in balanced the discharge process equilibrium, through gathering the discharge electric current in return circuit of this equilibrium, calculate this multiplexing partial pressure drop as the offset voltage, and then the adjacent arbitrary cell's of this cell of sureness or this cell voltage supervision value. The utility model discloses a voltage supervision device is accurate to cell's voltage supervision.

Description

The voltage monitoring device of battery modules and vehicle

Technical field

This utility model belongs to technical field of battery management, is related to the battery unit in one or more battery module is entered The voltage monitoring device of row voltage monitoring and the vehicle using this voltage monitoring device.

Background technology

In technical field of battery management, the energy module constituting for many battery modules is needed to carry out battery management, side Just battery management needs it is desirable to such as voltage monitoring is carried out to each battery unit in each battery modules, accordingly, it would be desirable to Accurate acquisition or detection obtain the magnitude of voltage of each battery unit as voltage monitoring value.

It is currently, there are various types of special ICs (asic) to gather often as voltage monitoring integrated circuit (ic) The magnitude of voltage of each battery unit in individual battery modules, for example, the ltc6804 (6-12) of Linear (lt) company, Texas Instrument (ti) mc33771 (6- of the bq76pl455 (6-16) of company and bq76pl536 (3-6), Freescale (freescale) company 14) etc..

Utility model content

The purpose of this utility model is, it is to avoid a certain cell balancing discharges to this battery unit and/or adjacent electricity The voltage acquisition of pool unit or the impact of supervision.

For realizing object above or other purposes, this utility model provides technical scheme below.

According to one side of the present utility model, provide a kind of voltage monitoring device of battery modules, for one or many Each in m battery unit being in charging and discharging circuit in individual battery modules carries out voltage monitoring, wherein, m be more than Or it is equal to 2 integer；

Voltage monitoring device includes:

Voltage monitoring integrated circuit, its be arranged to corresponding m described battery unit each form voltage respectively and adopt Collect loop and gather the magnitude of voltage of each battery unit；

First current acquisition part, it is configured to gather the equilibrium of each battery unit being in balanced discharge process and puts The electric current of The electric loop is as the first sample rate current；And

First compensating module, it is configured to be calculated the first benefit based on described first sample rate current and first resistor value Repay voltage, wherein said first resistor value is the balanced discharge loop of each battery unit and this battery list of balanced discharge process The resistance value of the adjacent multiplexing part of the voltage acquisition circuit of any battery unit of unit, and/or be configured to based on described First sample rate current and second resistance value are calculated the second offset voltage, and wherein said second resistance value is balanced discharge process The multiplexing part of itself corresponding voltage acquisition circuit of the balanced discharge loop of each battery unit and this battery unit electricity Resistance；

Wherein, described voltage monitoring device is configured to the balanced discharge mistake based on described voltage monitoring integrated circuit acquisition The adjacent magnitude of voltage of any battery unit of each battery unit of journey and at least described first offset voltage are calculated The voltage monitoring value of the adjacent any battery unit of each battery unit of balanced discharge process, and/or be configured to be based on The magnitude of voltage of each battery unit of balanced discharge process of described voltage monitoring integrated circuit acquisition and at least described second Offset voltage is calculated the voltage monitoring value of each battery unit of balanced discharge process.

According to the voltage monitoring device of this utility model one embodiment, wherein, described multiplexing part is described balanced discharge Loop and the sampling line of correspondence described voltage acquisition circuit multiplexing, this sampling line connects described voltage monitoring integrated circuit and described Battery modules.

In one example, described first current acquisition part and/or the first compensating module are configured in battery management system In.

In a further example, described first current acquisition part and/or the first compensating module are configured in described voltage prison Depending in integrated circuit.

According to the voltage monitoring device of the another embodiment of this utility model, wherein, described m battery unit is at least n The battery unit being in charging and discharging circuit in the different battery modules being connected in series, wherein n is whole more than or equal to 2 Number, m is the integer more than n.

According to the voltage monitoring device of the another embodiment of this utility model, wherein, battery modules described in adjacent i-th and It is provided with the connector with 3rd resistor value between (i+1) individual described battery modules, wherein, 1≤i≤(n-1)；

Voltage monitoring integrated circuit, it is also configured with the first collection terminal and the second collection terminal, described first collection terminal and Second collection terminal bridges each described connector arbitrary described battery unit adjacent with the two ends of this connector to form this electricity The voltage acquisition circuit of pool unit；And

Second compensating module, its be configured to based on the second sample rate current in the described charging and discharging circuit acquiring and The 3rd resistor value of described connector is calculated the 3rd offset voltage；

Wherein, described voltage monitoring device is also structured to described first based on described voltage monitoring integrated circuit acquisition Magnitude of voltage between collection terminal and the second collection terminal and at least described 3rd offset voltage are calculated described first collection terminal The voltage monitoring value of the battery unit of bridging corresponding with the second collection terminal.

Further, also include: the second current acquisition part, it is configured to gather the electric current of described charging and discharging circuit and makees For described second sample rate current.

In one example, described second current acquisition part and/or the second compensating module are configured in battery management system In.

In a further example, described second current acquisition part and/or the second compensating module are configured in described voltage prison Depending in integrated circuit.

According to the voltage monitoring device of this utility model a further embodiment, wherein, also include for putting described voltage prison Depending on the monitoring units circuit socket of integrated circuit with connect to one or more element circuits of described monitoring units circuit socket Extension socket.

Further, described monitoring units circuit socket is 1, and described element circuit extension socket is that (n-1) is individual, 1 Described voltage monitoring integrated circuit and (n-1) individual described element circuit extension socket correspond to the n battery mould being connected in series one by one Group arrangement, 1 described voltage monitoring integrated circuit is disposed in the position of opposite central.

According to another aspect of the present utility model, provide a kind of vehicle, it includes energy storing device, described energy stores It is provided with the voltage monitoring device described in multiple battery modules being connected in series and any of the above in device.

In one embodiment, described vehicle is electric vehicle or motor vehicle driven by mixed power.

Voltage monitoring device of the present utility model can eliminate the battery unit of balanced discharge to this battery unit and/or phase The adjacent voltage acquisition of battery unit or the impact of supervision, accurately accurate to the voltage monitoring of battery unit.

Brief description

From combine accompanying drawing described further below, it will make above and other purpose of the present utility model and advantage more Completely clear.

Fig. 1 is the structural representation of the voltage monitoring device of the battery modules according to this utility model one embodiment.

Fig. 2 is the voltage acquisition schematic diagram in balanced discharge process for the voltage monitoring device of embodiment illustrated in fig. 1.

Fig. 3 is that the modular structure of the voltage monitoring integrated circuit of the battery modules according to this utility model one embodiment is illustrated Figure.

Fig. 4 is the structural representation of the voltage monitoring device of the battery modules according to the another embodiment of this utility model.

Fig. 5 is the voltage acquisition schematic diagram in a balanced discharge situation for the voltage monitoring device of embodiment illustrated in fig. 4.

Fig. 6 is the voltage acquisition schematic diagram in another balanced discharge situation for the voltage monitoring device of embodiment illustrated in fig. 4.

Fig. 7 is the schematic flow sheet of the voltage monitoring method of the battery modules according to this utility model one embodiment.

Fig. 8 is the structural representation of the vehicle according to this utility model one embodiment.

Specific embodiment

Now with reference to accompanying drawing, this utility model is more fully described, shown in the drawings of of the present utility model exemplary Embodiment.But, this utility model can be realized according to much different forms, and is not construed as being limited to explain here The embodiment stated.On the contrary, these embodiments are provided so that the disclosure becomes thorough and complete, and conceived of the present utility model Entirely pass to those skilled in the art.In accompanying drawing, identical label refers to identical element or part, therefore, will omit to it Description.

Some block diagrams shown in accompanying drawing are functional entitys, not necessarily must be with physically or logically independent entity phase Corresponding.These functional entitys can be realized using software form, or in one or more hardware modules or integrated circuit Realize these functional entitys, or realize these functional entitys in different processor device and/or microcontroller device.

Fig. 1 show the structural representation of the voltage monitoring device of the battery modules according to this utility model one embodiment. In this embodiment, voltage monitoring device example is used for the battery to two of which battery modules (i.e. battery modules 110 and 120) Unit carry out voltage monitoring it is to be understood that, the quantity of the battery modules that voltage monitoring device simultaneously monitors not is restricted. Battery modules 110 and battery modules 120 are all mainly made up of 12 battery units, 12 battery units by 6 strings 2 and in the way of arrange Row；For example, inside battery modules 110, battery unit 110₁₁, battery unit 110₁₂To battery unit 110₁₆It is sequentially connected in series ground Connect and form string battery unit, battery unit 110₂₁, battery unit 110₂₂To battery unit 110₂₆Connect shape with being sequentially connected in series Become another row battery unit, two row battery units in parallel define the battery modules 110 of this utility model embodiment together；With Sample ground, inside battery modules 120, battery unit 120₁₁, battery unit 120₁₂To battery unit 120₁₆Connect with being sequentially connected in series Form string battery unit, battery unit 120₂₁, battery unit 120₂₂To battery unit 120₂₆Connect formation with being sequentially connected in series again String battery unit, two row battery units in parallel define the battery modules 120 of this utility model embodiment together.To electricity Each battery unit when battery unit in pond module 110 or 120 carries out voltage monitoring, to wherein any string battery unit Carry out voltage monitoring, be equivalent to that also corresponding battery unit has carried out voltage monitoring to another row battery unit simultaneously, namely quilt Equally monitor, for example, to battery unit 110₁₂Sample or detect that the magnitude of voltage obtaining is i.e. corresponding to be equal to battery unit 110₂₂ Sample or detect the magnitude of voltage obtaining, battery unit 110₂₂Equally monitored.Fig. 1 and figure 3 below to Fig. 6 shown in example In, the battery unit of the dotted line line respective column in battery modules represents the battery unit equally being monitored, in battery modules The battery unit realizing line respective column practically monitored wherein, selected which row quilt in multiple row battery unit arranged side by side Practical surveillance is not restricted.

It should be noted that the cell array of the battery modules in Fig. 1 and Fig. 3 to Fig. 6 of the present utility model In, illustrate the arrangement position in an array of each battery unit, the label xxx of in figure battery unit for convenience_yzIn, xxx table Show the battery modules that this battery unit is located, the first digit y in subscript yz represents this battery unit in this battery modules Columns, the second digit z in subscript yz represents this battery unit (or z z-th in the string of the series connection in this battery modules OK) battery unit.For example, battery unit 110₂₁Represent that it is in battery modules 110, and be located at the 1st the (or the 1st of the 2nd row Battery unit OK).

It should be noted that in each battery modules, the number of its included battery unit be not limited to above or Below example, its concrete arrangement mode is not the embodiment being limited to above and below.Multiple in each battery modules Can be identical between battery unit, for example, same model, identical running voltage etc., battery unit can be with monomer electricity The form performance in pond.

The battery modules 110 and 120 being connected in series may be constructed battery bag, such as hybrid vehicle or electric automobile Battery bag is it is to be understood that the number of battery modules included by battery bag is not limited to illustrate embodiment.

Battery modules 110 and 120 can be realized being connected in series by connector 210, and connector 210 for example can be for confluxing The conductor such as bar (busbar) or wire harness, the two ends of connector 210 adjoin the battery unit of difference battery modules, i.e. battery list respectively Unit 110₁₆With battery unit 120₁₁.Because connector 210 is in the charging and discharging circuit of battery modules 110 and 120, discharge and recharge Charge or discharge electric current i in loop₁Through connector 210 and pressure drop can be produced.

Continue as shown in figure 1, voltage monitoring device also includes voltage monitoring integrated circuit 220, in this embodiment, one Voltage monitoring integrated circuit 220 is not limited only to gather the magnitude of voltage of the battery unit being connected in series within battery modules, For example, voltage monitoring integrated circuit 220 gathers in the charging and discharging circuit of 2 battery modules being connected in series 110 and 120 simultaneously Each corresponding magnitude of voltage in 12 battery units being connected in series, for each battery unit, by voltage monitoring collection Circuit 220 is become to be respectively formed corresponding voltage acquisition circuit.

Voltage monitoring integrated circuit 220 may be selected to be the ltc6804 (6-12) of Linear (lt) company, Texas Instrument (ti) public affairs The chips such as the mc33771 (6-14) of the bq76pl455 (6-16) of department or Freescale (freescale) company.Chip-shaped above In number, the first bit digital in bracket represents the number of the minimum battery cell voltage simultaneously gathering of this chip needs, in bracket Second-order digit represent the number of battery cell voltage that this chip is at best able to gather simultaneously, for example, for chip Ltc6804 (6-12), it at least needs to correspond to 6 battery cell voltages of collection simultaneously, that is, need at least 6 battery units to be entered Row voltage monitoring, it is at best able to correspond to 12 battery cell voltages of collection simultaneously, can carry out electricity to 12 battery units Pressure monitors.

Utility model people notices that the voltage between 12 battery units there may be unbalanced situation, accordingly, it would be desirable to To realize the voltage between multiple battery units, equilibrium is basically reached to some or multiple electric discharge therein, this discharged Journey is balanced discharge；The process of balanced discharge can also be completed by voltage monitoring integrated circuit 220 control and be formed corresponding The balanced discharge loop of battery unit；But, during the balanced discharge of a certain battery unit, voltage monitoring integrated circuit 220 When the adjacent cell of this battery unit and this battery unit is carried out with voltage acquisition or detection, there is voltage acquisition inaccurate Problem.

For this reason, in this embodiment, as shown in figure 1, voltage monitoring device is additionally provided with the first current sample part 231 He First compensating module 241 is to compensate part balanced discharge loop in a certain cell balancing discharge process (line of especially sampling) The impact that the pressure drop producing produces to the voltage acquisition of this battery unit and its adjacent battery unit.Wherein, the first electric current Sample unit 231, it is used for gathering electric current in the balanced discharge loop of battery unit as sample rate current, and this sample rate current leads to Often in the 100ma order of magnitude, (it can reach hundreds of peace to the sample rate current collecting compared to the second current sample part 232 Training) very little.First compensating module 241 is coupled to current sample part the first current sample part 231, the first current sample portion The sample rate current of part 231 sends to the first compensating module 241.First compensating module 241 is configured input balanced discharge loop In be related to sampling line resistance value, according to this resistance value and sample rate current size, another offset voltage can be calculated (it is different from offset voltage v of the second compensating module 542 acquisition₁).

In one embodiment, as shown in figure 1, the first current sample part 231 can be, but not limited to be arranged on voltage monitoring In integrated circuit 220, the first compensating module 241 can be, but not limited to be arranged in battery management system 900, the first compensating module 241 specifically can pass through Programmable Logic Controller etc. realizes.

Fig. 2 show the voltage acquisition schematic diagram in balanced discharge process for the voltage monitoring device of embodiment illustrated in fig. 1.Knot Close shown in Fig. 1 and Fig. 2, with battery unit 120 that is collected or monitoring₁₁Illustrate for example.

As illustrated in fig. 2, it is assumed that battery unit 120₁₁Need balanced discharge, referring to Fig. 1, from battery unit 120₁₁Positive pole Sequentially pass through sampling line 221a, equalizing resistance r₃(not shown in figure 1), sampling line 221b are to battery unit 120₁₁Negative pole, from And form balanced discharge loop；This balanced discharge loop is in fig. 2 with resistance r₂, equalizing resistance r₃With resistance r₄The loop constituting Illustrate, the electric current in balanced discharge loop is i₂, it is for example in 100 milliamperes of orders of magnitude；Wherein, resistance r₂Illustrate from battery unit 120₁₁Positive best equalizing resistance r₃Between balanced discharge loop resistance, resistance r₄Illustrate from equalizing resistance r₃To battery list Unit 120₁₁Negative pole between balanced discharge loop resistance.The utility model people of the application notices especially using one Voltage monitoring integrated circuit to carry out voltage acquisition or supervision to the battery unit of multiple battery modules, and therefore, sampling line can not Be lengthened out with avoiding to original tens times even more many, therefore, the resistance of the sampling line in balanced discharge loop becomes larger And become the main impedance in balanced discharge loop, and can produce during balanced discharge and larger can affect battery unit Voltage acquisition accuracy pressure drop.Therefore, in one embodiment, resistance r₂It is essentially equivalent to the resistance of line 221a of sampling, Resistance r₄It is essentially equivalent to the resistance of line 221b of sampling, resistance of the miscellaneous part in balanced discharge loop etc. all can be adopted relatively The resistance of line-transect is ignored and disregards.Above resistance r₂With resistance r₄Can obtain (for example, according to adopting beforehand through methods such as measurements The length of line-transect can accurately be calculated resistance r in advance₂With resistance r₄) and be input to the first compensating module 241, equalizing resistance r₃The inside of voltage monitoring integrated circuit 220 can be specifically located at it is also possible to be arranged on outside voltage monitoring integrated circuit 220 Portion, on such as outside collection terminal or pin.

When balanced discharge is carried out in mode shown in Fig. 2 it should be noted that balanced discharge loop will be with battery unit 120₁₁ Voltage acquisition circuit fractional reuse, for example, resistance r₂With resistance r₄Corresponding balanced discharge loop feature is basic multiplexing, Resistance r₂With resistance r₄In battery unit 120₁₁Balanced discharge during the pressure drop that produces can by voltage monitoring integrated circuit 220 Corresponding collection terminal collect the magnitude of voltage v being collected as corresponding battery unit 12011_11’A part, therefore, this electricity Pressure value v_11’Now battery unit 120 can not truly be reflected₁₁Voltage.

For this reason, in balanced discharge, the electric current that the first current sample part 231 gathers balanced discharge loop is i₂, first Compensating module 241 obtains this electric current i from the first current sample part 231₂, and combine resistance r₂With resistance r₄, it is calculated compensation Voltage, i.e. v_{11 compensation}=(r₂+r₄) × i₂.Voltage monitoring device is further according to magnitude of voltage v_11’With offset voltage v_{11 compensation}Calculate v₁₁, It is specifically based on relationship below (1) to calculate:

v₁₁= v_11’- v_{11 compensation}= v_11’- (r₂+r₄) × i₂(1).

So, with calculated magnitude of voltage v₁₁As battery unit 120₁₁Voltage monitoring value, it can accurately reflect electricity Pool unit 120₁₁Virtual voltage during balanced discharge, accordingly, it is capable to more accurately and effectively gather to battery unit from Virtual voltage during balanced discharge.

When balanced discharge is carried out in mode shown in Fig. 2, it should also be noted that battery unit 120₁₁Balanced discharge loop Will be with battery unit 120₁₂Voltage acquisition circuit, battery unit 120₁₆Voltage acquisition circuit there is also fractional reuse, also It is to say, battery unit 120₁₁Partial-equilibrium discharge loop be in battery unit 120₁₂Voltage acquisition circuit on or be in Battery unit 120₁₆Voltage acquisition circuit on.

In battery unit 120₁₁Balanced discharge during and battery unit 120₁₂Voltage acquisition during, resistance r₄Right The balanced discharge loop feature answered is basic multiplexing, resistance r₄In battery unit 120₁₁Balanced discharge during produce pressure Fall can be collected as corresponding battery unit 120 by the corresponding collection terminal of voltage monitoring integrated circuit 220₁₂The voltage being collected Value v_12’A part, therefore, this magnitude of voltage v_12’Now battery unit 330 can not truly be reflected₁₂Voltage.

For this reason, in battery unit 120₁₁During balanced discharge, the first current sample part 231 gathers the electricity in balanced discharge loop Flow for i₂, the first compensating module 241 is from the first current sample part 231 acquisition this electric current i₂, and combine resistance r₄, it is calculated Offset voltage, i.e. v_{12 compensation}=r₄×i₂.Voltage monitoring device is further according to magnitude of voltage v_12’With offset voltage v_{12 compensation}Calculate v₁₂, tool Body is based on relationship below (2) and calculates:

v₁₂= v_12’- v_{12 compensation}= v_12’- r₄×i₂(2).

So, with calculated magnitude of voltage v₁₂As battery unit 120₁₂Voltage monitoring value, it can accurately reflect electricity Pool unit 120₁₂In adjacent battery unit 120₁₁Virtual voltage during balanced discharge, accordingly, it is capable to more real Now to battery unit 120₁₂It is in the virtual voltage during balanced discharge in its adjacent battery unit.

Equally, in battery unit 120₁₁Balanced discharge during and battery unit 120₁₆Voltage acquisition collection Cheng Zhong, resistance r₂Corresponding balanced discharge loop feature is substantially to be multiplexed (although battery unit 120₁₁With battery unit 120₁₆ It is in different battery modules), resistance r₂In battery unit 120₁₁Balanced discharge during the pressure drop that produces can by voltage Monitor that the corresponding collection terminal of integrated circuit 220 collects as corresponding battery unit 120₁₆The magnitude of voltage v being collected_16’One Part, this magnitude of voltage v_16’Now battery unit 120 can not truly be reflected₁₆Voltage.For this reason, equalizing in battery unit 12011 During electric discharge, the electric current that the first current sample part 231 gathers balanced discharge loop is i₂(including its sense of current information), first Compensating module 241 obtains this electric current i from the first current sample part 231₂, and combine resistance r₂, it is calculated offset voltage, that is, v_{16 compensation}=r₂×i₂.Voltage monitoring device is further according to magnitude of voltage v_16’With offset voltage v_{16 compensation}Calculate v₁₆, it is specifically based on following Relational expression (3) calculates:

v₁₄= v_14’+ v_{14 compensation}= v_12’+ r₄×i₂(3).

So, with calculated magnitude of voltage v₁₆As battery unit 120₁₆Voltage monitoring value, it can accurately reflect electricity Pool unit 120₁₆In adjacent battery unit 120₁₁Virtual voltage during balanced discharge, accordingly, it is capable to more real Now to battery unit 120₁₆It is in the virtual voltage during balanced discharge in its adjacent battery unit.

It should be noted that in v₁₂And v₁₆Compensation calculation during, not consider connector 210 resistance r₁Lead to Pressure drop, this is because connector 210 is not in battery unit 120₁₁With battery unit 110₁₆Voltage acquisition circuit on.And Even if connector 210 is simultaneously in battery unit 120₁₁Balanced discharge loop and voltage acquisition circuit on, the electricity of connector 210 Resistance r₁Relative sample line 221a mainly corresponding resistance r₂It is relatively small, during balanced discharge, connector 210 is produced Pressure drop very little, can not consider.But, for improving the accuracy of voltage acquisition, above v further₁₁Compensation calculation Process is it is further contemplated that the resistance r of connector 210₁The pressure drop leading to during balanced discharge.

Continue as shown in figure 1, utility model people is it is further noted that if based on currently existing scheme, supervised with a voltage Depending on integrated circuit 220(such as ltc6804 (6-12)) corresponding when monitoring battery modules 110 or 120, ltc6804 (6-12) Sufficiently do not applied, and, the quantity required of ltc6804 (6-12) chip also greatly increases.And utility model People be also noted that multiple battery modules assemblies need introduce connector realize being connected in series between them, meanwhile, charge or Discharge current i₁In the case of larger, for example, can reach more than 500a, therefore, connector 210 filling in charging and discharging circuit The pressure drop producing in electricity or discharge process be can not ignore, and particularly arranges longer in the distance between battery modules 110 and 120 Situations such as (for example may be more than 10 centimetres) leads to resistance value r of connector 210₁Increase further.Connector 210 is due to same When be on its adjacent voltage acquisition circuit of a certain battery unit, the pressure drop that therefore it produces easily is reflected in connector The a certain battery unit (110 that 210 two ends adjoin₁₆Or 120₁₁) voltage sample value in, therefore, the voltage of this battery unit is adopted Sample can not accurately reflect the virtual voltage of battery unit, easily causes voltage monitoring inaccurate.

Adopt chip ltc6804 (6-12) as example with voltage monitoring integrated circuit 220, it is simultaneously to 12 battery units (i.e. battery unit 110₁₁To 110₁₆With battery unit 120₁₁To 120₁₆) carry out voltage sample or detection, specifically, ltc6804 (6-12) 13 collection terminals or pin are connected with connected mode as shown in Figure 1 respectively, and that is, adjacent battery unit is indirectly Enter a collection terminal or pin carries out voltage acquisition, two can correspond to one voltage acquisition of composition and return between collection terminal or pin Road, two pressure reduction between collection terminal or pin are collected the magnitude of voltage corresponding to a certain battery unit.

But, for the battery unit 120 of one end connection of connector 210₁₁, due to the battery list in different battery modules Unit 120₁₁With battery unit 110₁₆Between introduce connector 210, a collection terminal of ltc6804 (6-12) or pin are to connect Enter in battery unit 110₁₆And connector 210 between, another collection terminal of ltc6804 (6-12) or pin are to access in battery Unit 120₁₁Negative pole one end, so, the adjacent collection terminal of two of which of ltc6804 (6-12) or pin are that corresponding bridging connects Part 210 and battery unit 120₁₁, thus defining battery unit 120₁₁Corresponding voltage acquisition circuit, connector 210 is in this On voltage acquisition circuit, therefore, the magnitude of voltage v of two above adjacent collection terminal collection₀Reflection is battery unit 120₁₁Electricity Pressure and pressure drop sum in charge and discharge process for the connector 210, it can not truly reflect battery unit 120₁₁Voltage.

For this reason, in this embodiment, voltage monitoring device is additionally provided with the second current sample part 232 and the second compensation mould Block 242.Wherein, the second current sample part 232 can gather the electric current of the charging and discharging circuit residing for connector 210 as sampling Electric current, i.e. electric current i₁, wherein electric current i₁Direction be not limited to illustrate embodiment.In this embodiment, the second current sample part 232 can be arranged in battery management system 900, be used for gathering the charging and discharging currents of battery bag in battery management system 900 Part can be used as the second current sample part 232 of this utility model embodiment.In one embodiment, the second compensating module 242 can also be arranged in battery management system 900, and it specifically can pass through Programmable Logic Controller etc. and realize, the second compensation mould Block 242 is coupled to the second current sample part 232 and can obtain the sample rate current that the second current sample part 232 is gathered i₁, the second compensating module 242 is for example programmably inputted corresponding resistance value r of connector 210₁, sample rate current i₁It is multiplied by electricity Resistance r₁Offset voltage v can be obtained₁, it corresponds to pressure drop in charge and discharge process for the connector 210.

What voltage monitoring device was based further on voltage monitoring integrated circuit 220 is connected across connector 210 and battery unit 120₁₁The magnitude of voltage v that gathered of two adjacent collection terminals₀Offset voltage v obtaining with the second compensating module 242₁It is calculated electricity Pressure value v_a, in this embodiment, the sample rate current i of connector 210₁Direction and voltage acquisition circuit residing for connector 210 Electric current (this electric current relative sample electric current i₁For very little) direction is identical, therefore, calculates v by relationship below (4)_a:

v_a= v₀- v₁= v₀- (i₁×r₁) (4).

Further, do not considering the battery unit 120 of above example₁₁Balanced discharge in the case of, voltage monitoring fill Put this magnitude of voltage v_aAs battery unit 120₁₁Voltage monitoring value, this voltage monitoring value can accurately reflect this battery unit 120₁₁In the virtual voltage of battery modules charge and discharge process, therefore, voltage monitoring device is to battery unit 120₁₁Voltage monitoring More accurate and effective.

Also need at the same time consider the battery unit 120 of above example₁₁Also in balanced discharge process to battery unit 120₁₁Voltage acquisition impact in the case of, the first current sample part 231 gather battery unit 120₁₁Balanced discharge loop Electric current i₂, the second current sample part 232 can gather the electric current of the charging and discharging circuit residing for connector 210 as sampling electricity Stream i₁, thus first voltage compensating module 231 and second voltage compensating module 232 obtain offset voltage v respectively simultaneously_{11 compensation}And benefit Repay voltage v₁₁.Voltage monitoring device is further according to magnitude of voltage v_11’, offset voltage v_{11 compensation}With offset voltage v₁Calculate v₁₁, specifically Calculated based on relationship below (5):

v₁₁= v_11’- v_{11 compensation}- v₁= v_11’- (r₂+r₄) × i₂- (i₁×r₁) (5).

So, with calculated magnitude of voltage v₁₁As battery unit 110₁₁Voltage monitoring value, it not only considers phase Adjacent battery unit 330₁₁The impact during being in balanced discharge, its voltage acquisition or supervision being produced, and consider and filling In discharge process, connector 210 to its voltage acquisition or monitors the impact producing.Therefore, magnitude of voltage v₁₄Can be more real Now to battery unit 320₁₄Virtual voltage.

It should be noted that for battery unit 120₁₁Outside other monitored battery units, their both positive and negative polarity Two ends are all to be connected across to form corresponding voltage acquisition circuit on two collection terminals of voltage monitoring integrated circuit 220 or pin, It is not introduced into connector 210, therefore, the magnitude of voltage of corresponding collection can accurately reflect respective battery reflection substantially in voltage acquisition circuit Voltage it is not necessary to consider the impact that its voltage acquisition produced in battery charging and discharging of connector 210.

In other embodiments, a collection terminal of ltc6804 (6-12) or pin are to access in battery unit 120₁₁With Between connector, another collection terminal of ltc6804 (6-12) or pin are to access in battery unit 110₁₆Positive pole one end, this Sample, the adjacent collection terminal of two of which of ltc6804 (6-12) or pin are corresponding bridging connector 210 and battery unit 110₁₆, Thus forming battery unit 110₁₆Voltage acquisition circuit.The electricity of the two of which adjacent collection terminal collection of ltc6804 (6-12) The reflection of pressure value is battery unit 110₁₆Pressure drop sum in charge and discharge process of voltage and connector 210.By right above Battery unit 120₁₁Similar processing mode, equally can accurately obtain battery unit 110₁₆Voltage monitoring value.

It is to be appreciated that in the embodiment above, voltage monitoring dress can be realized by configuring battery management system 900 The above calculating magnitude of voltage v putting₁₁、v₁₂、v₁₆And/or v_aProcess complete it is also possible to by joining in battery management system 900 Put the above calculating magnitude of voltage v that voltage monitoring integrated circuit 220 realizes voltage monitoring device₁₁、v₁₂、v₁₆And/or v_aProcess exist Complete in voltage monitoring integrated circuit 220, can also have the first compensating module 241/ second compensating module of calculation function The above calculating magnitude of voltage v of voltage monitoring device is realized in 242₁₁、v₁₂And v₁₆/ magnitude of voltage v_aProcess, or even can also set up It is independently arranged corresponding calculation processing apparatus to realize the above calculating magnitude of voltage v of voltage monitoring device₁₁、v₁₂、v₁₆And/or v_a Process.

In the voltage monitoring device of the battery modules of above example, a voltage monitoring integrated circuit 220 can be same When such as two battery modules are carried out with voltage sample, and, effectively prevent and lead to because of balanced discharge, connector 210 etc. The inaccurate problem of voltage sample, therefore, it can reduce the usage quantity of voltage monitoring integrated circuit 220, for example, if one Battery bag includes 50 battery modules as shown in Figure 1, and voltage monitoring device can be only using the integrated electricity of 25 voltage monitorings Road 220, the usage quantity of voltage monitoring integrated circuit 220 reduces half, greatly reduces the cost of voltage monitoring device.

It should be noted that the voltage monitoring integrated circuit 220 of this utility model embodiment is not limited to battery unit Carry out voltage sample, for example, other specification (such as battery cell temperature) can also be sampled.

Also, it should be noted the voltage compensation calculating process of the voltage monitoring value of above balanced discharge process is not limited to Gather the feelings of the magnitude of voltage of the battery unit being connected in series within multiple battery modules in a voltage monitoring integrated circuit 220 Apply under shape, for example, gather the battery list being connected in series within battery modules in a voltage monitoring integrated circuit 220 Can also apply, for example, based on relation above formula (1) calculating one corresponding with (2) corresponding principle in the case of the magnitude of voltage of unit The voltage monitoring value of the battery unit within individual battery modules.

Fig. 3 show the modular structure of the voltage monitoring integrated circuit of the battery modules according to this utility model one embodiment Schematic diagram.In this embodiment, the function of the voltage monitoring device of figure 1 above embodiment is not mainly all in voltage monitoring Complete in integrated circuit 220, the voltage monitoring integrated circuit 220 of this utility model embodiment is used not only for gathering 2 series connection even Each corresponding electricity in be connected in series 12 battery units in the charging and discharging circuit of battery modules 110 and 120 connecing Pressure value, and, it is also configured with the first compensating module 241 and the second compensating module 242 inside it.Voltage monitoring integrated circuit The equilibrium that the first compensating module 241 in 220 can obtain each battery unit that the first current sample part 231 is gathered is put Electric current, the first compensating module 241 can also be had all resistance values r as shown in Figure 2 by programmably input₂And r₄Deng, therefore, Illustrated based on figure 1 above and Fig. 2, equally can obtain offset voltage v of above example_{11 compensation}、v_{12 compensation}、v_{16 compensation}Deng；Voltage Monitor that the second compensating module 242 in integrated circuit 220 can obtain the sample rate current i that current sample part 230 is gathered₁, Second compensating module 242 can also be had corresponding resistance value r of connector 210 by programmably input₁, sample rate current i₁It is multiplied by electricity Resistance r₁Can equally obtain offset voltage v of figure 1 above example₁, it corresponds to connector 210 in charge and discharge process Pressure drop.In one embodiment, voltage monitoring integrated circuit 220 is designed to Programmable Logic Controller, and it can be programmably defeated Enter to sample line specifically corresponding resistance value, connector 210 specifically corresponding resistance value r₁.

In another alternative embodiment, or even it is integrated the second current sample part 232 can also to be arranged on voltage monitoring In circuit 220, namely voltage monitoring integrated circuit 220 has simultaneously and carries out electric current to the charging and discharging circuit residing for battery modules and adopt The function of sample.

The voltage monitoring integrated circuit 220 of embodiment illustrated in fig. 3 equally can be configured to based on co-relation formula (1) extremely (5) mode is calculated voltage monitoring value to accurately reflect the virtual voltage of respective battery unit, and it considers inside simultaneously Cell balancing discharge process balanced discharge loop is answered with the voltage acquisition circuit of this battery unit or adjacent cell With the pressure drop of connector 210 in the pressure drop of the part and/or battery modules charge and discharge process impact to voltage acquisition.And, Can realize based on a voltage monitoring integrated circuit 220, multiple battery modules (such as two battery modules 110 and 120) being entered Row voltage acquisition and supervision, advantageously reduce cost.

The concrete operating principle of voltage monitoring integrated circuit 220 of embodiment illustrated in fig. 3 and the voltage of embodiment illustrated in fig. 1 The operation principle of monitoring arrangement is essentially identical or similar, and this is no longer going to repeat them.It is to be understood that in example further below In the voltage monitoring device of voltage monitoring device or other embodiment, it can also be based on the above electricity to embodiment illustrated in fig. 1 Pressure monitoring arrangement conversion forms the mode of voltage monitoring integrated circuit 220, and similarly the corresponding voltage monitoring of conversion formation is integrated Circuit (ic).

Fig. 4 show the structural representation of the voltage monitoring device of the battery modules according to the another embodiment of this utility model Figure.In this embodiment, voltage monitoring device example is used for wherein three battery modules (i.e. battery modules 310,320 and 330) battery unit carry out voltage monitoring it is to be understood that, the quantity of the battery modules that voltage monitoring device simultaneously monitors is not It is restricted.Battery modules 310, battery modules 320 and battery modules 330 are all mainly made up of 12 battery units, 12 Battery unit by 4 string 3 and in the way of arrange；For example, inside battery modules 310, battery unit 310₁₁, battery unit 310₁₂ To battery unit 310₁₄Connect formation string battery unit, battery unit 310 with being sequentially connected in series₂₁, battery unit 310₂₂To battery Unit 310₂₄Connect the another row battery unit of formation, battery unit 310 with being sequentially connected in series₃₁, battery unit 310₃₂To battery unit 310₃₄Connect formation with being sequentially connected in series go back string battery unit, three row battery units in parallel define this utility model real together Apply the battery modules 310 of example；The arrangement mode of battery unit within battery modules 320 and battery modules 330 and battery modules 310 is identical.When voltage monitoring is carried out to the battery unit in battery modules 310 or 320 or 330, electric to wherein arbitrarily string Each battery unit of pool unit carries out voltage monitoring, is equivalent to that also corresponding battery unit enters to another row battery unit simultaneously Go voltage monitoring, namely equally monitored, for example, to battery unit 310₁₂The magnitude of voltage obtaining of sampling corresponds to equal to right Battery unit 310₂₂Or battery unit 310₃₂The magnitude of voltage that sampling obtains, battery unit 310₂₂With battery unit 310₃₂Equivalent Ground monitors.

Similarly, battery modules 310 and 320, battery modules 330 and 330 can be passed through connector 210 respectively and realize series connection Connect, connector 210 can be for example the conductor such as busbar (busbar) or wire harness, the two ends of connector 210 adjoin not respectively With the battery unit of battery modules, for example, battery unit 310₁₄With battery unit 320₁₁, battery unit 320₁₄And battery unit 330₁₁.Because connector 210 is in the charging and discharging circuit of battery modules 310,320 and 320, the charging in charging and discharging circuit or Discharge current i₁Through connector 210 and pressure drop can be produced.Similarly, connector 210 is due to being simultaneously in its adjacent certain One battery unit (such as 310₁₄、320₁₄) voltage acquisition circuit on, therefore, connector 210 produce pressure drop be easily reflected in The a certain battery unit (such as 310 that connector 210 two ends are adjoined₁₄、320₁₄) voltage sample in, therefore, this battery unit Voltage sample can not accurately reflect the virtual voltage of battery unit, easily cause voltage monitoring inaccurate.

Continue as shown in figure 4, voltage monitoring device also includes voltage monitoring integrated circuit 420, in this embodiment, voltage Monitor that integrated circuit 420 may be selected to be the ltc6804 (6-12) of Linear (lt) company, Texas Instrument (ti) company The chips such as the mc33771 (6-14) of bq76pl455 (6-16) or Freescale (freescale) company.In this embodiment, one Individual voltage monitoring integrated circuit 420 is not limited only to gather the magnitude of voltage of the battery unit being connected in series in battery modules, For example, voltage monitoring integrated circuit 420 gathers the charging and discharging circuit of 3 battery modules being connected in series 310,320 and 330 simultaneously In be connected in series 12 battery units in each corresponding magnitude of voltage.Core is adopted with voltage monitoring integrated circuit 420 Piece ltc6804 (6-12) is example, and it has the ability that can simultaneously correspond to 12 battery cell voltages of collection, therefore can be right 12 battery unit (i.e. battery unit 310 of three modules₁₁To 310₁₄, battery unit 320₁₁To 320₁₄And battery unit 330₁₁To 330₁₄) carry out voltage sample or detection simultaneously.Specifically, 13 collection terminals of ltc6804 (6-12) or pin difference Connected with connected mode as shown in Figure 4, access a collection terminal between adjacent battery unit or pin carries out voltage and adopts Collection, two can correspond to one voltage acquisition circuit of composition, two pressures between collection terminal or pin between collection terminal or pin Difference can gather out the magnitude of voltage of this battery unit.

In this embodiment, arranging unit monitoring circuit in voltage monitoring device (cell monitoring circuit, Cmc) socket 451 and some element circuits extension (cell circuit extension, cce) socket 452, wherein, voltage is supervised It is inserted on cmc socket 451 depending on integrated circuit 420, can external sampling line or sampling wire harness connection on cmc socket 451 Corresponding position to battery modules 320 as shown in Figure 4, thus, the part collection terminal of voltage monitoring integrated circuit 420 or Pin can be coupled indirectly to the two ends of respective battery unit by cmc socket 451 and exterior strands, carries out forming this electricity The voltage acquisition circuit of pool unit；Voltage monitoring integrated circuit 420 is not put, it can external sampling line on cce socket 452 Or sampling wire harness connects the corresponding position to battery modules 310 or 330 as shown in Figure 4, and cce socket 452 and cmc Pass through such as connector between socket 451 to connect, thus, the signal that the sampling line of cce socket 452 is gathered can pass sequentially through Cce socket 452, cmc socket 451 transmit the appropriate section collection terminal or pin to voltage monitoring integrated circuit 420, equally permissible Form voltage acquisition circuit.

The position based on the corresponding battery modules that they connect respectively for the placement location of cce socket 452 and cmc socket 451 To determine, wherein, if voltage monitoring integrated circuit 420 gathers the voltage of three or more than three battery modules being connected in series Value, cmc socket 451 correspondence is placed in the side of the battery modules being in middle position in three or more than three battery modules, cce Socket 452 correspondence is placed in the side of other battery modules, for example, outside the corresponding battery modules (320) connecting of cmc socket 451 Each battery modules (310 or 330) be arranged in correspondence with a cce socket 452, so, be conducive to shorten sampling line (for example adopt Line-transect 421b, 421c and 421d) length and be conducive to sample line arrangement in good order.The particular number of cce socket 452 It is not restricted, it can be according to the quantity of the corresponding detection of voltage monitoring integrated circuit 420 or the battery modules of collection Lai really Fixed.

Continue as shown in figure 4, due to the introducing of connector 210, equally existing the problem of figure 1 above illustrated embodiment, That is, the battery unit such as battery unit 310 that connector 210 one end adjoins₁₄, due to the battery list in different battery modules Unit 320₁₁With battery unit 310₁₄Between introduce connector 210, with voltage monitoring integrated circuit 420 as ltc6804 (6-12) For example, collection terminal of ltc6804 (6-12) is to access (for example pass through cmc socket 451 and sampling line accesses) in battery list Unit 320₁₁And connector 210 between, another collection terminal of ltc6804 (6-12) be access (for example pass through cmc socket 451, Cce socket 452 and sampling line access) in battery unit 310₁₄Positive pole one end, so, the two of which of ltc6804 (6-12) Adjacent collection terminal or pin are corresponding bridging connector 210 and battery unit 310₁₄, they are used for forming battery unit 310₁₄'s Voltage acquisition circuit, the magnitude of voltage v of collection₀Reflection is battery unit 310₁₄Voltage and connector 210 in charge and discharge process In pressure drop sum, it can not truly reflect battery unit 310₁₄Voltage.For battery unit 320₁₄It is to exist to be similar to Situation.

For this reason, in this embodiment, voltage monitoring device also sets up the second current sample part 432 and the second compensating module 442.Wherein, the second current sample part 432 can gather the electric current of the charging and discharging circuit residing for connector 210 as sampling electricity Stream, i.e. electric current i₁, in this embodiment, the second current sample part 432 can be arranged in battery management system 900, battery The part being used for gathering the charging and discharging currents of battery bag in management system 900 can be used as the second electricity of this utility model embodiment Stream sample unit 432.In one embodiment, the second compensating module 442 can also be arranged in battery management system 900, its tool Body can pass through Programmable Logic Controller etc. and realize, and the second compensating module 442 can obtain the second current sample part 432 and be gathered Sample rate current i₁, compensating module 240 is for example programmably inputted corresponding resistance value r of connector 210₁, sample rate current i₁ It is multiplied by resistance value r₁Offset voltage v can be obtained₁, it corresponds to pressure drop in charge and discharge process for the connector 210.

What voltage monitoring device was based further on voltage monitoring integrated circuit 420 is connected across connector 410 and battery unit 310₁₄(or battery unit 320₁₄) the magnitude of voltage v that gathered of two adjacent collection terminals₀The compensation obtaining with the second compensating module 442 Voltage v₁It is calculated magnitude of voltage v₁₄, for example it is based on relationship below (6) and calculate:

v₁₄= v₀- v₁= v₀- (i₁×r₁) (6).

Do not considering battery unit 310₁₄(or battery unit 320₁₄) and its adjacent cell balanced discharge situation Under, voltage monitoring device can be further by magnitude of voltage v₁₄As battery unit 310₁₄(or battery unit 320₁₄) voltage prison Apparent value, this voltage monitoring value more can accurately reflect this battery unit 310₁₄(or battery unit 320₁₄) virtual voltage.

It is to be appreciated that the above calculating electricity of voltage monitoring device can be realized by configuring battery management system 900 Pressure value v₁₄Process completes it is also possible to realize voltage prison by configuring voltage monitoring integrated circuit 420 in battery management system 900 The above calculating magnitude of voltage v of view apparatus₁₄Process completes in voltage monitoring integrated circuit 420, can also have calculation function The second compensating module 442 realize the above calculating magnitude of voltage v of voltage monitoring device₁₄Process, or even can also set up and independently set Put corresponding calculation processing apparatus to realize the above calculating magnitude of voltage v of voltage monitoring device₁₄Process.

In the voltage monitoring device of the battery modules of figure 4 above illustrated embodiment, a voltage monitoring integrated circuit 420 Voltage sample can be carried out to such as three battery modules simultaneously, and, effectively prevent and adopt because of the voltage that connector 210 leads to The inaccurate problem of sample, therefore, it can for the usage quantity of voltage monitoring integrated circuit 420 to be reduced to original 1/3rd, Greatly reduce voltage monitoring device cost while, the accuracy of voltage monitoring does not decline.

Continue as shown in figure 4, being additionally provided with the first current sample part 431 and the first compensating module in voltage monitoring device 441.First current sample part 431 is used for gathering electric current in the balanced discharge loop of battery unit as sample rate current, should , generally in the 100ma order of magnitude, (it is permissible for the sample rate current collecting compared to the second current sample part 432 for sample rate current Reach hundreds of ampere) very little.This sample rate current sends to the first compensating module 441.First compensating module 441 is configured to input There is the resistance value of the sampling line being related in balanced discharge loop, according to this resistance value and sample rate current size, can calculate To another offset voltage, (it is different from offset voltage v of the second compensating module 442 acquisition₁).

In this embodiment, setting the first current sample part 431 and the first compensating module 441 are to compensate for a certain electricity The pressure drop that partial-equilibrium discharge loop during pool unit balanced discharge (line of especially sampling) produces to this battery unit and The impact that the voltage acquisition of its adjacent battery unit produces.

Fig. 5 show the voltage monitoring device of the embodiment illustrated in fig. 4 voltage acquisition principle in a balanced discharge situation Figure, Fig. 6 show the voltage acquisition schematic diagram in another balanced discharge situation for the voltage monitoring device of embodiment illustrated in fig. 4.With The operation principle of the voltage monitoring device to this utility model embodiment for the lower combination Fig. 4 to Fig. 6 carries out detailed example explanation.

In a kind of balanced discharge situation, as shown in fig. 5, it is assumed that with battery unit 330₁₁Balanced discharge is needed to be example, Referring to Fig. 4, from battery unit 330₁₁Positive pole sequentially pass through sampling line 421b and cce socket 452, equalizing resistance r₆(in Fig. 4 not Illustrate), cce socket 452 and sampling line 421c to battery unit 330₁₁Negative pole, thus forming balanced discharge loop；This equilibrium Discharge loop is in Figure 5 mainly with resistance r₅, equalizing resistance r₆With resistance r₇Illustrate, the electric current in balanced discharge loop is i₄, its example As in 100 milliamperes of orders of magnitude；Wherein, resistance r₅Illustrate from battery unit 330₁₁Positive best equalizing resistance r₆Between equilibrium put The equivalent resistance of The electric loop, resistance r₇Illustrate from equalizing resistance r6 to battery unit 330₁₁Negative pole between balanced discharge loop Equivalent resistance.The utility model people of the application notices due to current embodiment require that adopting a voltage monitoring integrated circuit To carry out voltage acquisition or supervision to the battery unit of multiple battery modules, therefore, sampling line is inevitably lengthened out to former Tens times come even more many；Therefore, the resistance of the sampling line in balanced discharge loop becomes larger and becomes balanced discharge to return The main impedance on road, and the larger voltage acquisition accuracy that can affect battery unit can be produced during balanced discharge Pressure drop.Therefore, in one embodiment, resistance r₅It is essentially equivalent to the resistance of line 421b of sampling, resistance r₇It is essentially equivalent to The resistance of sampling line 421c, the cce socket 452 in balanced discharge loop and being arranged between cce socket 452 and cmc socket 451 Resistance of connector etc. all can be ignored with the resistance of relative sample line and disregard.Above resistance r₅With resistance r₇Can be beforehand through The methods such as measurement obtain and (for example, can accurately be calculated resistance r in advance according to the length of sampling line₅With resistance r₇) and be transfused to To the first compensating module 441, equalizing resistance r₆The inside of voltage monitoring integrated circuit 420 can be specifically located at it is also possible to set Put outside voltage monitoring integrated circuit 420, on such as cmc socket 451.

When carrying out balanced discharge in the manner illustrated in fig. 5 it should be noted that balanced discharge loop will be with battery unit 330₁₁ Voltage acquisition circuit fractional reuse, for example, resistance r₅With resistance r₇Corresponding balanced discharge loop feature is basic multiplexing, Resistance r₅With resistance r₇In battery unit 330₁₁Balanced discharge during the pressure drop that produces can by voltage monitoring integrated circuit 420 Corresponding collection terminal collect as corresponding battery unit 330₁₁The magnitude of voltage v being collected_11’A part, therefore, this voltage Value v_11’Now battery unit 330 can not truly be reflected₁₁Voltage.

For this reason, in balanced discharge, the electric current that the first current sample part 431 gathers balanced discharge loop is i₄, first Compensating module 441 obtains this electric current i from the first current sample part 431₄, and combine resistance r₅With resistance r₇, it is calculated compensation Voltage, i.e. v_{11 compensation}=(r₅+r₇) × i₄.Voltage monitoring device is further according to magnitude of voltage v_11’With offset voltage v_{11 compensation}Calculate v₁₁, It is specifically based on relationship below (7) to calculate:

v₁₁= v_11’- v_{11 compensation}= v_11’- (r₅+r₇) × i₄(7).

So, with calculated magnitude of voltage v₁₁As battery unit 330₁₁Voltage monitoring value, it can accurately reflect electricity Pool unit 330₁₁Virtual voltage during balanced discharge, accordingly, it is capable to more accurately and effectively gather to battery unit from Virtual voltage during balanced discharge.

When carrying out balanced discharge in the manner illustrated in fig. 5, it should also be noted that battery unit 330₁₁Balanced discharge loop Will be with battery unit 330₁₂Voltage acquisition circuit, battery unit 320₁₄Voltage acquisition circuit there is also fractional reuse, also It is to say, battery unit 330₁₁Partial-equilibrium discharge loop be in battery unit 330₁₂Voltage acquisition circuit on or be in Battery unit 320₁₄Voltage acquisition circuit on

In battery unit 330₁₁Balanced discharge during and battery unit 330₁₂The gatherer process of voltage acquisition in, Resistance r₇Corresponding balanced discharge loop feature is basic multiplexing, resistance r₇In battery unit 330₁₁Balanced discharge during The pressure drop producing can be collected as corresponding battery unit 330 by the corresponding collection terminal of voltage monitoring integrated circuit 420₁₂Gathered The magnitude of voltage v arriving_12’A part, therefore, this magnitude of voltage v_12’Now battery unit 330 can not truly be reflected₁₂Voltage.

For this reason, in battery unit 330₁₁During balanced discharge, the first current sample part 431 gathers the electricity in balanced discharge loop Flow for i₄, the first compensating module 441 is from the first current sample part 431 acquisition this electric current i₄, and combine resistance r₇, it is calculated Offset voltage, i.e. v_{12 compensation}=r₇×i₄.Voltage monitoring device is further according to magnitude of voltage v_12’With offset voltage v_{12 compensation}Calculate v₁₂, tool Body is based on relationship below (8) and calculates:

v₁₂= v_12’- v_{12 compensation}= v_12’- r₇×i₄(8).

So, with calculated magnitude of voltage v₁₂As battery unit 330₁₂Voltage monitoring value, it can accurately reflect electricity Pool unit 330₁₂In adjacent battery unit 330₁₁Virtual voltage during balanced discharge, accordingly, it is capable to more real Now to battery unit 330₁₂It is in the virtual voltage during balanced discharge in its adjacent battery unit.

Equally, in battery unit 330₁₁Balanced discharge during and battery unit 320₁₄Voltage acquisition collection Cheng Zhong, resistance r₅Corresponding balanced discharge loop feature is substantially to be multiplexed (although battery unit 330₁₁With battery unit 320₁₄ It is in different battery modules), resistance r₅In battery unit 330₁₁Balanced discharge during the pressure drop that produces can by voltage Monitor that the corresponding collection terminal of integrated circuit 420 collects as corresponding battery unit 320₁₄The magnitude of voltage v being collected_14’One Part, this magnitude of voltage v_14’Now battery unit 320 can not truly be reflected₁₄Voltage.For this reason, in battery unit 330₁₁Equilibrium During electric discharge, the electric current that the first current sample part 431 gathers balanced discharge loop is i₄(including its sense of current information), first Compensating module 441 obtains this electric current i from the first current sample part 431₄, and combine resistance r₅, it is calculated offset voltage, that is, v_{14 compensation}=r₅×i₄.Voltage monitoring device is further according to magnitude of voltage v_14’With offset voltage v_{14 compensation}Calculate v₁₄, it is specifically based on following Relational expression (9) calculates:

v₁₄= v_14’+ v_{14 compensation}= v_14’+ r₅×i₄(9).

So, with calculated magnitude of voltage v₁₄As battery unit 320₁₄Voltage monitoring value, it can accurately reflect electricity Pool unit 320₁₄In adjacent battery unit 330₁₁Virtual voltage during balanced discharge, accordingly, it is capable to more real Now to battery unit 320₁₄It is in the virtual voltage during balanced discharge in its adjacent battery unit.

It should be noted that in v₁₁And v₁₄Compensation calculation during, not consider connector 210 resistance r₁Lead to Pressure drop, this is because connector 210 is not in battery unit 330₁₁Balanced discharge loop on；Even and if, connector 210 It is in battery unit 330₁₁On balanced discharge loop, the resistance r of connector 210₁Relative sample line 421b mainly corresponding resistance R5 is relatively small, is not considering charging current i from charging and discharging circuit₁In the case of the pressure drop leading to, balanced discharge mistake Cheng Zhong, pressure drop produced by connector 210 is very little, can not consider in this embodiment.But, if connector 210 It is in battery unit 330₁₁It is multiplexed on balanced discharge loop and by relevant voltage acquisition circuit, for improving voltage acquisition further Accuracy, above v₁₁And v₁₄Compensation calculation process need to consider further the resistance r of connector 210₁In balanced discharge process In the pressure drop that leads to.

And, if also need to consider the charging and discharging currents i of charging and discharging circuit₁The pressure drop that the connector 210 leading to produces In the case of in addition it is also necessary to consider offset voltage v that second voltage compensating module 442 obtains₁= (i₁×r₁), that is, voltage Monitoring arrangement is further according to magnitude of voltage v_14’, offset voltage v_{14 compensation}With offset voltage v₁Calculate v₁₄, it is specifically based on relationship below (10) calculate:

v₁₄= v_14’+ v_{14 compensation}- v₁= v_14’+ r₅×i₄- (i₁×r₁) (10).

So, with calculated magnitude of voltage v₁₄As battery unit 320₁₄Voltage monitoring value, it not only considers phase Adjacent battery unit 330₁₁The impact during being in balanced discharge, its voltage acquisition or supervision being produced, and consider and filling In discharge process, connector 210 to its voltage acquisition or monitors the impact producing.Therefore, magnitude of voltage v₁₄Can be more real Now to battery unit 320₁₄Virtual voltage.

Figure 5 above example illustrates to be connected in series one of battery unit of multiple battery modules in balanced discharge such as What is the need remove the impact of the voltage acquisition of the battery unit to this balanced discharge and the battery unit how eliminating this balanced discharge Impact to the voltage acquisition of adjacent battery unit.

In another balanced discharge situation, as shown in Figure 6 it is assumed that with battery unit 330₁₁With battery unit 330₁₂Need Balanced discharge is wanted to be example, wherein, battery unit 330₁₁Balanced discharge loop same as shown in Figure 5；Similarly, battery unit 330₁₂The composition in balanced discharge loop and battery unit 330₁₁Composition substantially similar, its be mainly by resistance r₇, equilibrium electricity Resistance r₈With resistance r₉The loop of composition, wherein, resistance r₇It is battery unit 330₁₁Balanced discharge loop and battery unit 330₁₂ The part that shared of balanced discharge loop, namely the part of multiplexing, resistance r₉Illustrate from equalizing resistance r₈To battery unit 330₁₂Negative pole between balanced discharge loop resistance, resistance r₉It is essentially equivalent to the resistance of line 421d of sampling, Ye Jijun Resistance of the cce socket 452 of weighing apparatus discharge loop and the connector being arranged between cce socket 452 and cmc socket 451 etc. It is ignored with the resistance of relative sample line and disregard.Similarly, above resistance r₉Can obtain and quilt beforehand through methods such as measurements Input to the first compensating module 441, equalizing resistance r₈The inside of voltage monitoring integrated circuit 420 can be specifically located at, also may be used To be arranged on outside voltage monitoring integrated circuit 420.

When balanced discharge is carried out in mode shown in Fig. 6 it should be noted that battery unit 330₁₁Balanced discharge loop will With battery unit 330₂Balanced discharge loop multiplexing part, i.e. resistance r₇Corresponding part, it is also and battery unit 330₁₁Voltage acquisition circuit fractional reuse, or with battery unit 330₁₂Voltage acquisition circuit fractional reuse.Cause This, voltage monitoring device calculate battery unit 330₁₁Or battery unit 330₁₂Voltage monitoring value when, not only need consider During itself balanced discharge, the impact to voltage acquisition for the pressure drop in balanced discharge loop is in addition it is also necessary to consider adjacent battery unit It is in the pressure drop of partial-equilibrium discharge loop during the balanced discharge impact to voltage acquisition.Now, the first current sample portion Part 431 gathers battery unit 330₁₁Balanced discharge loop electric current i₄, and gather battery unit 330 simultaneously₁₂Equilibrium put The electric current i of The electric loop₅, the first compensating module 441 is from the first current sample part 431 acquisition this electric current i₄And i₅.And, it is based on Known resistance r₅With resistance r₇, for battery unit 330₁₁, it is calculated offset voltage, i.e. v_{11 compensation}=(r₅+r₇) × i₄- r₇ ×i₅；Voltage monitoring device is further according to magnitude of voltage v_11’With offset voltage v_{11 compensation}Calculate v₁₁, it is specifically based on relationship below (11) calculate:

v₁₁= v_11’- v_{11 compensation}= v_11’- (r₅+r₇) × i₄+ r₇×i₅(11).

Similarly, based on known resistance r₉With resistance r₇, for battery unit 330₁₂, it is calculated offset voltage, that is, v_{12 compensation}=(r₉+r₇) × i₅- r₇×i₄.Voltage monitoring device is further according to the magnitude of voltage v collecting_12’With the first compensating module Offset voltage v of 441 acquisitions_{12 compensation}Calculate v₁₂, it is specifically based on relationship below (12) and calculate:

v₁₂= v_12’- v_{12 compensation}= v_12’- (r₉+r₇) × i₅+ r₇×i₄(12).

By above magnitude of voltage v₁₁And v₁₂Respectively as battery unit 330 under this balanced discharge situation₁₁And battery unit 330₁₂Voltage monitoring value, it will be more accurate.

Balanced discharge situation shown in figure 6 above is actually the extension of balanced discharge situation shown in Fig. 5, that takes into account two Adjacent battery unit influencing each other in the case of balanced discharge at the same time.

It should be noted that the calculating of the offset voltage of various embodiments above and/or the voltage as voltage monitoring value In the calculating process of value, " plus " or " subtracting " be the sense of current according to voltage acquisition circuit with charging and discharging circuit on the sense of current Relation or to determine with the relation of the sense of current on balanced discharge loop.

Based on figure 1 above to embodiment illustrated in fig. 4 it is to be understood that the voltage monitoring device of embodiment of the present utility model Or voltage monitoring integrated circuit can realize the voltage monitoring of the multiple battery modules being connected in series of other any arrangement modes Or collection, for example, battery unit is with 3 strings 4 and the battery modules that arrange；According to the battery being connected in series in each battery modules The quantity of unit and voltage monitoring integrated circuit are at best able to correspond to the quantity of the battery cell voltage of collection simultaneously, permissible Specifically determine the quantity of the corresponding collection of each voltage monitoring integrated circuit or the battery modules monitoring.

Voltage monitoring device below in conjunction with embodiment illustrated in fig. 4 illustrates the voltage monitoring of this utility model embodiment Method.

Fig. 7 show the schematic flow sheet of the voltage monitoring method of the battery modules according to this utility model one embodiment. In conjunction with figure 4 above to Fig. 7, its procedure is described.

First, step s710, voltage monitoring integrated circuit acquisition magnitude of voltage.Wherein, voltage monitoring integrated circuit 420 gathers Each monitored battery unit being in charging and discharging circuit of multiple battery modules (310,320 and 330) being connected in series Magnitude of voltage, be connected across, including collection, the battery unit (such as 310 that each connector 210 and connector 210 adjoin₁₄Or 320₁₄) two collection terminals between magnitude of voltage, for example, the magnitude of voltage v of figure 4 above illustrated embodiment₀.

Step s721, the second current acquisition part 432 gathers the electric current i of charging and discharging circuit₁As the second sample rate current.Enter One step, step s722, the second compensating module 442 is calculated each battery unit (such as 310 being affected by connector 210₁₄Or 320₁₄) corresponding second offset voltage.Offset voltage v of this calculating process such as figure 4 above illustrated embodiment₁Calculating process phase With, i.e. v₁= i₁×r₁, wherein, r₁For the resistance of connector 210, i₁Sample rate current for charging and discharging circuit.

Simultaneously, step s731, the first current acquisition part 431 gathers the electricity in the balanced discharge loop of each battery unit Flow as corresponding first sample rate current, the collection balanced discharge loop of this gatherer process and figure 5 above and embodiment illustrated in fig. 6 Electric current i₄And i₅Process identical.Further, step s732, first compensating module 441 is calculated and is affected by balanced discharge Corresponding first offset voltage of each battery unit, the calculating process of this first offset voltage and v in Fig. 5 and Fig. 6 example_{11 compensation}、 v_{12 compensation}Or v_{14 compensation}Calculating process identical, whether can be affected by itself balanced discharge according to this battery unit and/or whether be subject to Adjacent cell balanced discharge affects to determine the calculation of the second offset voltage.

Further, step s740, the first offset voltage according to each battery unit and/or the second offset voltage and correspondence The magnitude of voltage of each battery unit collection, is calculated corresponding magnitude of voltage as the voltage monitoring value of this battery unit.This meter Calculation process v in above and Fig. 5 and Fig. 6 example₁₁、v₁₂Or v₁₄Calculating process identical, will not be described in detail herein.Need explanation It is, if battery unit is only affected by connector 210, to be based on relational expression (6) according to figure 4 above illustrated embodiment and calculate voltage Value v₁₄Method obtaining its voltage monitoring value；If battery unit is only affected by itself balanced discharge, according to figure 5 above institute Show that embodiment is based on relational expression (7) and calculates magnitude of voltage v₁₁Method obtaining its voltage monitoring value；If battery unit is only subject to phase The balanced discharge impact of adjacent battery unit, then be based on relational expression (8)/(9) according to figure 5 above illustrated embodiment and calculate magnitude of voltage v₁₂/v₁₄Method obtaining its voltage monitoring value；If battery unit had both been affected by itself balanced discharge and had been subject to adjacent cell list First balanced discharge impact, then be based on relational expression (11)/(12) according to figure 6 above illustrated embodiment and calculate magnitude of voltage v₁₁/v₁₂Side Method is obtaining its voltage monitoring value；If battery unit had both been affected by connector 210 and had been subject to adjacent cell balanced discharge shadow Ring, be then based on relational expression (10) according to figure 5 above illustrated embodiment and calculate magnitude of voltage v₁₄Method obtaining its voltage monitoring value； Certainly, the electricity if neither being affected by connector 210 nor being affected by any cell balancing electric discharge, based on corresponding collection Pressure value is as voltage monitoring value.

It should be noted that because the length of different battery units corresponding sampling line is probably different, therefore, being in The resistance of the sampling line on balanced discharge loop is also possibly different.The corresponding battery list connecting for cmc socket 451 Unit, because its line of sampling may be relatively short, its produced pressure drop during balanced discharge is probably voltage acquisition precision In the range of being allowed, corresponding battery unit (the such as battery unit 320 connecting for cmc socket 451₁₁, battery unit 320₁₂, battery unit 320₁₃), also selectively using the magnitude of voltage of corresponding collection as voltage monitoring value.

Fig. 8 show the structural representation of the vehicle according to this utility model one embodiment.In this embodiment, vehicle 80 Dynamical system 800 at least adopt motor 840 to provide driving force, dynamical system 800 also includes energy storing device 810, energy It is provided with the battery bag that multiple battery modules being connected in series are formed in storage device 810, and also set up figure 1 above or figure The voltage monitoring device of 4 illustrated embodiments, or also set up the voltage monitoring integrated circuit of figure 3 above illustrated embodiment, voltage Monitoring arrangement or voltage monitoring integrated circuit are in each battery unit being in charging and discharging circuit in multiple battery modules Carry out voltage monitoring.Dynamical system 800 also includes electric machine control system 820, the sensor 850 of motor 840 one end setting, vehicle Control module 830.The electric power of energy storing device 810 output passes through electric machine control system 820 and/or vehicle control module 830 Control realization on demand, stably exports to be provided to motor 840, from the drive control to vehicle for the realization.

The vehicle of embodiment illustrated in fig. 8 is specifically as follows electric vehicle or motor vehicle driven by mixed power it should be appreciated that arriving, with Used in figure 8 above illustrated embodiment, energy storing device 810 can be widely applied to can be used in promoting having of vehicle Any dynamical system of one or more motors.The example of motor vehicle driven by mixed power can include but is not limited to plug-in hybrid Vehicle, double mode motor vehicle driven by mixed power, full motor vehicle driven by mixed power, extended-range motor vehicle driven by mixed power, power-assisted hybrid electric vehicle , light hybrid vehicle, serial mixed power vehicle, parallel hybrid vehicles, series-parallel hybrid power Vehicle, the motor vehicle driven by mixed power of fluid power motor vehicle driven by mixed power, power dividing type motor vehicle driven by mixed power and any other type.This Vehicle in open can be configured to car, motor type car, truck, bus, commercial car, transboundary car, recreation vehicle etc., should When being understood by, the technology of the disclosure is not limited to a certain certain types of vehicle.

It will be understood that, to be taken in it is said that when part " connection ", " coupling " or " access " is arrived another part, it can be direct Connect or couple or be linked into another part it is also possible to there is the intermediate member in addition to described connector 210.

Example above primarily illustrates the voltage monitoring device of battery modules of the present utility model, the integrated electricity of voltage monitoring Road, voltage monitoring method and the vehicle using voltage monitoring device of the present utility model or voltage monitoring integrated circuit.Although Only to some of them, embodiment of the present utility model is described, but those of ordinary skill in the art it is to be appreciated that this Utility model can be being implemented with many others forms with scope without departing from its spirit, and for example, each voltage monitoring is integrated The change of the battery modules quantity that circuit gathered or monitored.Therefore, the example shown and embodiment are considered schematic And nonrestrictive, in the case of without departing from this utility model spirit and scope as defined in appended claims, This utility model may cover various modifications and replacement.

Claims (13)

1. a kind of voltage monitoring device of battery modules, for being in charging and discharging circuit in one or more battery module M battery unit in each carry out voltage monitoring, wherein, m is the integer more than or equal to 2；

Voltage monitoring device includes:

Voltage monitoring integrated circuit, its be arranged to corresponding m described battery unit each form voltage acquisition respectively and return Road simultaneously gathers the magnitude of voltage of each battery unit；

First current acquisition part, it is configured to gather the balanced discharge of each battery unit being in balanced discharge process and returns The electric current on road is as the first sample rate current；And

First compensating module, it is configured to be calculated the first compensation electricity based on described first sample rate current and first resistor value Pressure, the balanced discharge loop of each battery unit for balanced discharge process for the wherein said first resistor value and this battery unit institute The resistance value of the adjacent multiplexing part of the voltage acquisition circuit of any battery unit, and/or be configured to based on described first Sample rate current and second resistance value are calculated the second offset voltage, and wherein said second resistance value is the every of balanced discharge process The resistance value of the multiplexing part of itself corresponding voltage acquisition circuit of the balanced discharge loop of individual battery unit and this battery unit；

Wherein, described voltage monitoring device is configured to the balanced discharge process based on described voltage monitoring integrated circuit acquisition The adjacent magnitude of voltage of any battery unit of each battery unit and at least described first offset voltage are calculated equilibrium The voltage monitoring value of the adjacent any battery unit of each battery unit of discharge process, and/or be configured to based on described The magnitude of voltage of each battery unit of balanced discharge process of voltage monitoring integrated circuit acquisition and at least described second compensation Voltage calculates the voltage monitoring value of each battery unit being equalized discharge process.

2. voltage monitoring device as claimed in claim 1, wherein, described multiplexing part is described balanced discharge loop and correspondence The sampling line of described voltage acquisition circuit multiplexing, this sampling line connects described voltage monitoring integrated circuit and described battery modules.

3. voltage monitoring device as claimed in claim 1, wherein, described first current acquisition part and/or first compensates mould Block is configured in battery management system.

4. voltage monitoring device as claimed in claim 1, wherein, described first current acquisition part and/or first compensates mould Block is configured in described voltage monitoring integrated circuit.

5. voltage monitoring device as claimed in claim 1, wherein, described m battery unit is at least n and is connected in series not With the battery unit being in charging and discharging circuit in battery modules, wherein n is the integer more than or equal to 2, and m is more than n's Integer.

6. voltage monitoring device as claimed in claim 5, wherein, battery modules described in adjacent i-th and (i+1) individual institute State and between battery modules, be provided with the connector with 3rd resistor value, wherein, 1≤i≤(n-1)；

Voltage monitoring integrated circuit, it is also configured with the first collection terminal and the second collection terminal, described first collection terminal and second Collection terminal bridges each described connector arbitrary described battery unit adjacent with the two ends of this connector to form this battery list The voltage acquisition circuit of unit；And

Second compensating module, it is configured to based on the second sample rate current in the described charging and discharging circuit acquiring and described The 3rd resistor value of connector is calculated the 3rd offset voltage；

Wherein, described voltage monitoring device is also structured to described first collection based on described voltage monitoring integrated circuit acquisition Magnitude of voltage between end and the second collection terminal and at least described 3rd offset voltage are calculated described first collection terminal and the The voltage monitoring value of the battery unit of the corresponding bridging of two collection terminals.

7. voltage monitoring device as claimed in claim 6, wherein, also includes: the second current acquisition part, and it is configured to adopt The electric current collecting described charging and discharging circuit is as described second sample rate current.

8. voltage monitoring device as claimed in claim 7, wherein, described second current acquisition part and/or second compensates mould Block is configured in battery management system.

9. voltage monitoring device as claimed in claim 7, wherein, described second current acquisition part and/or second compensates mould Block is configured in described voltage monitoring integrated circuit.

10. voltage monitoring device as claimed in claim 6, wherein, also includes for putting described voltage monitoring integrated circuit Monitoring units circuit socket and connect to one or more element circuit extension sockets of described monitoring units circuit socket.

11. voltage monitoring devices as claimed in claim 10, wherein, described monitoring units circuit socket is 1, described unit Circuit extension socket is that (n-1) is individual, 1 described voltage monitoring integrated circuit and (n-1) individual described element circuit extension socket by The one corresponding n battery modules arrangement being connected in series, 1 described voltage monitoring integrated circuit is disposed in the position of opposite central Put.

A kind of 12. vehicles, it includes energy storing device, is provided with multiple batteries being connected in series in described energy storing device Module and the voltage monitoring device as any one of claim 1 to 11.

13. vehicles as claimed in claim 12, wherein, described vehicle is electric vehicle or motor vehicle driven by mixed power.