CN106816658B - Battery pack and its guard method - Google Patents

Battery pack and its guard method Download PDF

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Publication number
CN106816658B
CN106816658B CN201610726108.8A CN201610726108A CN106816658B CN 106816658 B CN106816658 B CN 106816658B CN 201610726108 A CN201610726108 A CN 201610726108A CN 106816658 B CN106816658 B CN 106816658B
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battery pack
temperature
current
preset
value
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CN106816658A (en
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陈仕波
汪卓
陈亮
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Nanjing Chervon Industry Co Ltd
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Nanjing Chervon Industry Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/443—Methods for charging or discharging in response to temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a kind of battery pack and its guard method, the wherein guard methods of battery pack, comprising steps of the temperature T of detection battery pack；Detect the electric current I of battery pack；The criterion temperature T of n-th is calculated according to the internal resistance of battery core, specific heat capacity, quality and time span t in the electric current of battery pack, battery packn, when n is equal to 1, t is that the electric current I of battery pack ends to duration length when calculating, Tn‑1For the temperature T of battery pack, when n is greater than 1, t is the time span of setting, Tn‑1Resulting criterion temperature is calculated for the last time；Judge whether criterion temperature is greater than preset temperature value；When criterion temperature is greater than preset temperature value, so that battery pack is stopped charging or stop electric discharge.The guard method of battery pack is able to extend the service life of battery pack.

Description

Battery pack and protection method thereof
Technical Field
The invention relates to a battery pack, in particular to a protection method of the battery pack.
Background
In the charging or discharging working process of the conventional battery pack, the temperature of an internal battery core can be gradually increased along with the continuous working time, and if the heat dissipation or power-off protection cannot be performed on the battery pack, the battery pack is possibly damaged after the temperature is increased to a certain degree.
Aiming at the rise of the temperature of the battery pack, on one hand, the battery pack can be timely cooled, and on the other hand, the battery pack stops charging or discharging when the temperature of the battery pack rises to a preset temperature value.
The conventional battery pack temperature detection device is usually arranged on the outer surface of a battery core, but when the battery pack stops charging or discharging according to the temperature of the outer surface of the battery core, the service life of the battery pack is shortened because the temperature of the outer surface of the battery core cannot truly reflect the temperature of the battery core.
Disclosure of Invention
A method of protecting a battery pack, comprising: detecting the temperature T of the battery pack; detecting the current I of the battery pack; according to the formulaCalculating the criterion temperature of the nth time, wherein R is the internal resistance of the battery cell in the battery pack, C is the specific heat capacity of the battery cell in the battery pack, m is the mass of the battery cell in the battery pack, and T is the mass of the battery cell in the battery packn-1The temperature is the criterion temperature of the (n-1) th time, n is a positive integer greater than or equal to 1, when n is equal to 1, T is the duration of the current I of the battery pack from cut-off to calculation, and T is the time length of the current I of the battery pack from cut-off to calculationn-1When n is more than 1, T is the set time length and is the temperature T of the battery packn-1The criterion temperature obtained by the last calculation is used; judging whether the criterion temperature is greater than a preset temperature value or not; and when the criterion temperature is higher than the preset temperature value, stopping charging or discharging the battery pack.
Further, the step of detecting the current I of the battery pack further includes: judging whether the current I of the battery pack is larger than a preset current value or not; and if the current I of the battery pack is larger than the preset current value, judging whether to stop charging or discharging the battery pack according to the criterion temperature.
Further, if the current I of the battery pack is smaller than or equal to a preset current value, whether the battery pack stops charging or discharging is judged according to the temperature T of the battery pack.
Further, when n is greater than 1, the greater n, the shorter the time length t.
Another protection method of a battery pack includes: detecting the temperature T of the battery pack; detecting the current I of the battery pack; according to the formulaCalculating a temperature correction value delta T, wherein T is the duration of time from the cut-off of the current I of the battery pack to the calculation, R is the internal resistance of the electric core in the battery pack, C is the specific heat capacity of the electric core in the battery pack, and m is the mass of the electric core in the battery pack; judging whether the sum T + delta T of the temperature T of the battery pack and the temperature correction value delta T is greater than a preset temperature value or not; and when the sum T + delta T of the temperature T of the battery pack and the temperature correction value delta T is greater than a preset temperature value, stopping charging or discharging the battery pack.
Further, the step of detecting the current I of the battery pack further includes: judging whether the current I of the battery pack is larger than a preset current value or not; if the current I of the battery pack is larger than the preset current value, judging whether to stop charging or discharging the battery pack according to the sum T + delta T of the temperature T of the battery pack and the temperature correction value delta T; and if the current I of the battery pack is smaller than or equal to the preset current value, judging whether to stop charging or discharging the battery pack according to the temperature T of the battery pack.
Further, as the duration of the current I of the battery pack increases, the time interval between whether to stop charging or discharging the battery pack is determined twice to be shortened.
Another protection method of a battery pack includes: detecting an initial temperature T of a battery pack0(ii) a According to the formula ∑ T ═ Δ T1+…+ΔTnCalculate the cumulative temperature rise ΣT, wherein,i is the current value of the battery pack during the nth calculation, R is the internal resistance of the electric core in the battery pack, C is the specific heat capacity of the electric core in the battery pack, m is the mass of the electric core in the battery pack, and t is the preset time length set during the nth calculation; determining an initial temperature T of a battery pack0And the sum T of the cumulative temperature rise Sigma T0Whether the positive sigma T is larger than a preset temperature value or not; when the initial temperature T of the battery pack0And the sum T of the cumulative temperature rise Sigma T0And when the positive sigma T is larger than the preset temperature value, stopping charging or discharging the battery pack.
Further, during cumulative temperature riseThe value of the internal resistance R in the step (2) is increased along with the increase of the calculation times n.
A battery pack adopts any one of the above protection methods for the battery pack.
The protection method of the battery pack can monitor the actual temperature of the battery cell more accurately on the basis of the measured surface temperature of the battery cell.
Drawings
Fig. 1 is a flow chart of a method of protecting a battery pack;
fig. 2 is a flow chart of another method of protecting a battery pack;
fig. 3 is a flowchart of still another protection method for a battery pack.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
Fig. 1 shows a flow chart of a protection method of a battery pack. As shown in fig. 1, the method for protecting a battery pack specifically includes the following steps:
the temperature T of the battery pack is detected.
Specifically, it is known that the temperature inside the battery pack can be continuously increased during the operation of the battery pack, and if the temperature inside the battery pack cannot be timely dissipated, the battery pack may be damaged when the temperature is too high, so that the battery pack needs to be protected against the temperature inside the battery pack.
Structurally, a battery pack generally includes a case and a cell. In order to achieve a nominal voltage of a battery pack that is sufficiently large for a single battery pack, a single battery pack typically includes a plurality of battery cells, and the plurality of battery cells are accommodated in a housing.
Here, detecting the temperature T of the battery pack may refer to detecting a highest surface temperature of the battery cell. The temperature of the battery cell cannot be truly reflected only by detecting the highest surface temperature of the battery cell, but the temperature of the battery cell is difficult to directly obtain through temperature detection at present, so that the temperature inside the battery pack is compensated on the basis of detecting the highest surface temperature of the battery cell.
And detecting the current I of the battery pack.
And detecting and recording the current I of the battery pack, wherein the current I of the battery pack can be the charging current or the discharging current of the battery pack. The protection method of the battery pack is suitable for the charging process of the battery pack and also suitable for the discharging process of the battery pack.
Specifically, the method may further include the steps of: and judging whether the current I of the battery pack is larger than a preset current value I1. The preset current value I1 may be preset according to various factors such as the characteristics of the battery pack and the operating environment. For example, in the present embodiment, the preset current value I1 may be set to 40A, but it is understood by those skilled in the art that the magnitude of the preset current value I1 is not limited thereto.
Judging whether the current I of the battery pack is larger than a preset current value I1, if so, proceeding to the following steps: calculating the nth criterion temperature Tn。
If the current I of the battery pack is less than or equal to the preset current value I1, directly judging whether the temperature T of the battery pack is greater than a preset temperature value T1 according to the temperature T of the battery pack, and if the temperature T of the battery pack is greater than a preset temperature value T1, performing the following steps: stopping charging or discharging the battery pack; and if the temperature T of the battery pack is less than or equal to the preset temperature value T1, returning to the step: the temperature T of the battery pack is detected.
The preset temperature value T1 is a temperature value preset by a user, and the preset temperature value T1 can be preset by the user according to the characteristics of the battery pack, the working environment and other factors. For example, in the present embodiment, the preset temperature value T1 may be set to 70 ℃, although those skilled in the art will understand that the size of the preset temperature value T1 is not limited thereto.
Calculating the nth criterion temperature Tn。
In particular, the method comprises the following steps of,wherein R is the internal resistance of the cell in the battery pack, C is the specific heat capacity of the cell in the battery pack, m is the mass of the cell in the battery pack, and T is the mass of the cell in the battery packn-1Is the criterion temperature of the (n-1) th time, and the value of n is a positive integer which is more than or equal to 1.
TnFor the nth criterion temperature, Tn-1When n is equal to 1, T is the time length of the current I of the battery pack from cut-off to calculation, and T is the time length of the current I of the battery pack for the (n-1) th criterion temperaturen-1Is the temperature T of the battery pack. That is to say when n is equal to 1, when the temperature is determinedWherein T is0T is namely
When n is greater than 1, T is a set time length, Tn-1The criterion temperature obtained by the last calculation is used. For example,as yet another example of an implementation of the method,and the like. Where t is a set length of time, it is understood that, in one aspect, t may be a set fixed length of time, for example, when n is greater than 1, t is 10 s; on the other hand, t may be a set change time length, for example, when n is greater than 1, the time length t becomes shorter as n increases.
Judging criterion temperature TnIf it is greater than preset temperature value T1.
In calculating the nth criterion temperature TnThen, the temperature T of the criterion is judgednWhether it is greater than preset temperature T1, when the temperature T is judgednIf the temperature value is greater than the preset temperature value T1, the following steps are carried out: stopping charging or discharging the battery pack; when the temperature T is judgednWhen the temperature is less than the preset temperature value T1, the method returns to the step: the temperature T of the battery pack is detected.
The battery pack is stopped from being charged or discharged.
After the steps of judging the temperature are completed, if the temperature of the battery core is greater than the preset temperature value T1, which indicates that the temperature inside the battery pack is relatively high, the power supply should be timely disconnected, so that the battery pack stops charging or discharging, and the purpose of protecting the battery pack is achieved.
In the above steps, when no specific description is given, no order is present between the steps. For example, the step of "detecting the temperature T of the battery pack" may be provided after the step of "detecting the current I of the battery pack". For another example: the step of detecting the temperature T of the battery pack may be further provided after the step of determining whether the current I of the battery pack is greater than the preset current value I1.
Therefore, the criterion temperature T can be calculated in a mode of compensating the temperature in the battery pack in the charging or discharging process of the battery packnTherefore, the temperature of the battery cell can be reflected more accurately and truly in real time, the problem that the battery pack is damaged due to untimely power failure caused by judging whether the power supply is disconnected or not only by detecting the highest temperature on the surface of the battery cell is avoided, the battery pack can be better protected, and the service life of the battery pack is prolonged.
Fig. 2 shows a flow chart of another protection method for a battery pack. As shown in fig. 2, the method for protecting a battery pack specifically includes the following steps:
the temperature T of the battery pack is detected.
Here, detecting the temperature T of the battery pack may refer to detecting a highest surface temperature of the battery cells inside the battery pack. The temperature of the battery cell cannot be truly reflected only by detecting the highest surface temperature of the battery cell, but the temperature of the battery cell is difficult to directly obtain through temperature detection at present, so that the temperature inside the battery pack is compensated on the basis of detecting the highest surface temperature of the battery cell.
And detecting the current I of the battery pack.
And detecting and recording the current I of the battery pack, wherein the current I of the battery pack can be the charging current or the discharging current of the battery pack. The protection method of the battery pack is suitable for the charging process of the battery pack and is also suitable for the discharging process of the battery pack.
Specifically, the method may further include the steps of: and judging whether the current I of the battery pack is larger than a preset current value I1. The preset current value I1 may be preset according to various factors such as the characteristics of the battery pack and the operating environment.
Judging whether the current I of the battery pack is larger than a preset current value I1, if so, proceeding to the following steps: the temperature correction value Δ T is calculated.
If the current I of the battery pack is less than or equal to the preset current value I1, directly judging whether the temperature T of the battery pack is greater than a preset temperature value T1 according to the temperature T of the battery pack, and if the temperature T of the battery pack is greater than a preset temperature value T1, performing the following steps: stopping charging or discharging the battery pack; and if the temperature T of the battery pack is less than or equal to the preset temperature value T1, returning to the step: the temperature T of the battery pack is detected.
The preset temperature value T1 is a preset temperature value, and the preset temperature value T1 can be preset by a user according to the characteristics of the battery pack, the working environment, and other factors.
The temperature correction value Δ T is calculated.
In particular, the method comprises the following steps of,wherein t is the duration of time from the current cutoff of the battery pack to the calculation, R is the internal resistance of the electric core in the battery pack, C is the specific heat capacity of the electric core in the battery pack, and m is the mass of the electric core in the battery pack.
And judging whether the sum of the temperature T of the battery pack and the temperature correction value delta T is greater than a preset temperature value T1.
Specifically, after the temperature correction value Δ T is calculated, the value that can truly reflect the temperature of the battery cell should be T + Δ T, and at this time, it is determined whether T + Δ T is greater than a preset temperature value T1. When T + Δ T is greater than preset temperature value T1, the steps are performed: stopping charging or discharging the battery pack; and when T + Δ T is less than or equal to preset temperature value T1, returning to the step: the temperature T of the battery pack is detected.
The battery pack is stopped from being charged or discharged.
After the above steps are completed, if the temperature inside the battery core is greater than the preset temperature value T1, which indicates that the temperature inside the battery pack is relatively high, the power supply should be turned off in time, so that the battery pack stops charging or discharging, and the purpose of protecting the battery pack is achieved.
And t is the duration of the current I of the battery pack, and the time interval between the charging stop and the discharging stop of the battery pack is judged twice along with the increase of the duration of the current I of the battery pack. That is, as T increases, the time interval from when T + Δ T is judged to be less than the preset temperature value T1 to when the step "detect the temperature T of the battery pack" is returned to may be shortened, that is, the frequency of the judgment may be appropriately increased.
In the above steps, there is no order between the steps unless otherwise specified. For example, the step of "detecting the temperature T of the battery pack" may be provided after the step of "detecting the current I of the battery pack". For another example: the step of detecting the temperature T of the battery pack may be further provided after the step of determining whether the current I of the battery pack is greater than the preset current value I1.
Like this, the battery package can calculate the temperature of electric core through the mode of compensating to the temperature of battery package inside at the in-process that charges or discharges to can be more real-time, accurate, true reaction electric core's temperature, avoid because only judge the problem that whether the outage that causes is not timely damages the battery package through the highest temperature that detects electric core surface, and then can make the battery package obtain better protection, the life of extension battery package.
Fig. 3 shows a flow chart of yet another method of protecting a battery pack. As shown in fig. 3, the method for protecting a battery pack specifically includes the following steps:
detecting an initial temperature T of a battery pack0。
Here, the initial temperature T of the battery pack is detected0It may refer to detecting the highest surface temperature of the battery cell inside the battery pack. It is known that the detection of the highest surface temperature of the cell alone cannot truly reactThe temperature of the battery cell is difficult to directly obtain through temperature detection at present, so that the temperature inside the battery pack is compensated on the basis of detecting the highest surface temperature of the battery cell.
And calculating the accumulated temperature rise sigma T.
Specifically, Σ T ═ Δ T1+…+ΔTn. Wherein,i is the current value of the battery pack during the nth calculation, R is the internal resistance of the battery cell in the battery pack, C is the specific heat capacity of the battery cell in the battery pack, m is the mass of the battery cell in the battery pack, and t is the preset duration set during the nth calculation.
Σ T is the cumulative temperature rise at the time of the nth calculation, and for example, the cumulative temperature rise Σ T at the first time is Δ T1To do soWherein I is the current value of the battery pack at the first calculation. For another example, the second cumulative temperature rise Σ T ═ Δ T1+ΔT2To do soWherein I is the current value of the battery pack at the second calculation.
Judging the initial temperature T0And the cumulative temperature rise Σ T is greater than a preset temperature value T1.
After calculating the accumulated temperature rise sigma T, judging T0Whether or not the positive sigma T is greater than a preset temperature value T1, when T is greater than the preset temperature value0When the + sigma T is larger than the preset temperature value T1, the following steps are performed: stopping charging or discharging the battery pack; when T is0When + Σ T is less than or equal to the preset temperature value T1, go back to the step: and calculating the accumulated temperature rise sigma T.
The battery pack is stopped from being charged or discharged.
After the above steps of judging the temperature are completed, if the temperature of the battery core is greater than the preset temperature value T1, which indicates that the temperature inside the battery pack is relatively high, the power supply should be timely turned off, so that the battery pack stops charging or discharging, and the purpose of protecting the battery pack is achieved.
Where R is the internal resistance of the battery pack, we know that the internal resistance of the battery pack increases with the discharge or charge time of the battery pack, and therefore, here, the internal resistance of the battery pack is also set to increase with the increase of the number of calculations n.
Like this, the battery package can be calculated through the mode of compensating to the inside temperature of battery package at the in-process that charges or discharges to can be more real-time, accurate, true reaction electric core's temperature, avoid because only judge the problem that whether the outage that causes is not in time damages the battery package through the highest temperature that detects electric core surface, and then can make the battery package obtain better protection, the life of extension battery package.
The invention also provides a battery pack, and the battery pack can be protected by adopting any one of the above protection methods of the battery pack. The battery pack may include: the device comprises a temperature detection module, a current detection modulus, a temperature compensation module and a control module. The temperature detection module may be used for detecting the temperature T of the battery pack or for detecting the initial temperature T of the battery pack0. The current detection module may be used to detect the current I of the battery pack, for example. The temperature compensation module is used for calculating and compensating the temperature of the battery cell. The control module is used for being electrically connected with the temperature detection module, the current detection module and the temperature compensation module respectively, calculating and judging, and finally determining whether to stop charging or discharging the battery pack.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims (10)

1. A method of protecting a battery pack, comprising:
detecting the temperature T of the battery pack;
detecting the current I of the battery pack;
according to the formulaCalculating the criterion temperature of the nth time, wherein R is the internal resistance of the battery cell in the battery pack, C is the specific heat capacity of the battery cell in the battery pack, m is the mass of the battery cell in the battery pack, and T is the reference temperature of the battery packn-1The temperature is the criterion temperature of the (n-1) th time, n is a positive integer which is more than or equal to 1, when n is equal to 1, T is the duration of the current I of the battery pack from cut-off to calculation, and T isn-1When n is more than 1, T is a set time length and is the temperature T of the battery packn-1The criterion temperature obtained by the last calculation is used;
judging whether the criterion temperature is greater than a preset temperature value or not;
and when the criterion temperature is greater than the preset temperature value, stopping charging or discharging the battery pack.
2. The method for protecting a battery pack according to claim 1, wherein:
detecting the current I of the battery pack;
further comprising:
judging whether the current I of the battery pack is larger than a preset current value;
and if the current I of the battery pack is larger than the preset current value, judging whether to stop charging or discharging the battery pack according to the criterion temperature.
3. The battery pack protection method according to claim 2, wherein:
and if the current I of the battery pack is smaller than or equal to the preset current value, judging whether to stop charging or discharging the battery pack according to the temperature T of the battery pack.
4. The method for protecting a battery pack according to claim 1, wherein:
when n is greater than 1, the greater n, the shorter the time length t.
5. A method of protecting a battery pack, comprising:
detecting the temperature T of the battery pack;
detecting the current I of the battery pack;
according to the formulaCalculating a temperature correction value delta T, wherein T is the duration of time from the cut-off of the current I of the battery pack to the calculation, R is the internal resistance of the electric core in the battery pack, C is the specific heat capacity of the electric core in the battery pack, and m is the mass of the electric core in the battery pack;
judging whether the sum T + delta T of the temperature T of the battery pack and the temperature correction value delta T is greater than a preset temperature value or not;
and when the sum T + delta T of the temperature T of the battery pack and the temperature correction value delta T is greater than the preset temperature value, stopping charging or discharging the battery pack.
6. The battery pack protection method according to claim 5, wherein:
detecting the current I of the battery pack;
further comprising:
judging whether the current I of the battery pack is larger than a preset current value;
if the current I of the battery pack is larger than the preset current value, judging whether to stop charging or discharging the battery pack according to the sum T + delta T of the temperature T of the battery pack and the temperature correction value delta T;
and if the current I of the battery pack is smaller than or equal to the preset current value, judging whether to stop charging or discharging the battery pack according to the temperature T of the battery pack.
7. The battery pack protection method according to claim 6, wherein:
and judging whether to shorten the time interval between the stop of charging or the stop of discharging of the battery pack twice along with the increase of the duration of the current I of the battery pack.
8. A method of protecting a battery pack, comprising:
detecting an initial temperature T of the battery pack0；
According to the formula ∑ T ═ Δ T1+…+ΔTnThe accumulated temperature rise, Σ T, is calculated, wherein,i is the current value of the battery pack during the nth calculation, R is the internal resistance of the electric core in the battery pack, C is the specific heat capacity of the electric core in the battery pack, m is the mass of the electric core in the battery pack, and t is the preset time length set during the nth calculation;
judging the initial temperature T of the battery pack0With the sum T of said cumulative temperature rise Sigma T0Whether the positive sigma T is larger than a preset temperature value or not;
when the initial temperature T of the battery pack0With the sum T of said cumulative temperature rise Sigma T0And when the positive sigma T is larger than the preset temperature value, stopping charging or discharging the battery pack.
9. The battery pack protection method according to claim 8, wherein:
in the cumulative temperature riseThe value of the internal resistance R in the step (2) is increased along with the increase of the calculation times n.
10. A battery pack, which employs the protection method of the battery pack according to any one of claims 1 to 9.
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