CN114571124B - Battery cell welding position determining method and battery module manufacturing method - Google Patents
Battery cell welding position determining method and battery module manufacturing method Download PDFInfo
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- CN114571124B CN114571124B CN202210364613.8A CN202210364613A CN114571124B CN 114571124 B CN114571124 B CN 114571124B CN 202210364613 A CN202210364613 A CN 202210364613A CN 114571124 B CN114571124 B CN 114571124B
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- 238000003466 welding Methods 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 210000004027 cell Anatomy 0.000 claims description 236
- 230000015654 memory Effects 0.000 claims description 23
- 230000007246 mechanism Effects 0.000 claims description 21
- 238000005259 measurement Methods 0.000 claims description 11
- 210000004460 N cell Anatomy 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000003860 storage Methods 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention discloses a method for determining a welding position of a battery cell and a method for preparing a battery module, wherein the method for determining the welding position of the battery cell comprises the following steps: aiming at the ith electric core, obtaining the initial position of the pole of the ith electric core according to the actual thickness of the electric core of each electric core from the 1 st electric core to the ith electric core; acquiring the bundling length of the battery module; obtaining the resilience of the electric core of each electric core from the 1 st electric core to the i th electric core according to the bundling length, the actual thickness and the theoretical thickness of the electric core of each electric core from the 1 st electric core to the i th electric core, and the absolute value of the deviation of the actual thickness and the thickness of the module; and obtaining the welding position of the ith battery cell according to the initial position of the pole of the ith battery cell and the battery cell resilience of each battery cell from the 1 st battery cell to the ith battery cell. Therefore, the welding position of the battery cell can be obtained through obtaining the actual thickness of the battery cell and calculating, and the problem that the welding position is not at the theoretical position can be solved under the condition of addressing without photographing.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a method for determining a welding position of a battery core and a method for preparing a battery module.
Background
The current power battery cell units basically need to be subjected to cell thickness measurement before forming a module, and post photographing is usually required after forming the module for subsequent BUSBAR welding. The three procedures of thickness measurement, photographing and welding are independent in series on the current production line, namely, after a semi-finished product module to be welded is formed by a series of treatment after the qualified battery cell thickness measurement, addressing photographing is needed for the pole, then BUSBAR is placed, and finally welding is carried out. However, such designs result in complex automated production processes for the modules and affect the placement of the various workstation structures on the production line. For example, pole addressing photographing must be performed without shielding, which results in photographing before the BUSBAR is placed, and further, since the current module band and BUSBAR feeding are manually implemented, the two processes of the module band and BUSBAR feeding are forced to be separated into two independent processes due to the photographing step between the module band and BUSBAR feeding, which are close to the process that can be completed by the same operator.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a method for determining a welding position of a battery cell and a method for preparing a battery module, so as to solve the problems of complex automatic production process and labor waste of the current battery module.
According to a first aspect, an embodiment of the present invention provides a method for determining a welding position of a battery cell, including the following steps: aiming at an ith electric core of a battery module, acquiring the actual thickness and the theoretical thickness of each electric core from the 1 st electric core to the ith electric core in the battery module; obtaining the initial position of the pole of the ith battery cell according to the actual thickness of the battery cell from the 1 st battery cell to each battery cell in the ith battery cell; respectively obtaining the actual thickness of the battery module, the theoretical thickness of the battery module and the absolute value of the module thickness deviation between the actual thickness of the battery module; acquiring the bundling length of the battery module; obtaining the cell resilience amount of each of the 1 st to the i th cells according to the bundling length, the actual thickness and the theoretical thickness of each of the 1 st to the i th cells, and the absolute deviation value of the actual thickness and the thickness of the module; and obtaining the welding position of the ith electric core according to the initial position of the pole of the ith electric core and the electric core resilience amount of each electric core from the 1 st electric core to the ith electric core.
With reference to the first aspect, in a first implementation manner of the first aspect, the obtaining, according to an actual thickness of each of the 1 st cell to the i th cell, a terminal initial position of the i th cell includes: and adding half of the actual thickness of the electric core of the ith electric core to the sum of the actual thicknesses of the electric cores of all the electric cores from the 1 st electric core to the i-1 th electric core in the battery module to obtain the initial position of the pole of the ith electric core.
With reference to the first aspect, in a second implementation manner of the first aspect, before the absolute value of the module thickness deviation between the module theoretical thickness and the module actual thickness of the battery module, the method further includes: obtaining the absolute value of the deviation of the thickness of the electric core of each electric core in the battery module according to the actual thickness and the theoretical thickness of the electric core of each electric core in the battery module; and adding the absolute values of the cell thickness deviations of all the cells in the battery module to obtain the absolute value of the module thickness deviation of the battery module.
With reference to the first aspect, in a third implementation manner of the first aspect, obtaining the resilience of each of the 1 st to the i th cells according to the bundling length, the actual thickness and the theoretical thickness of each of the 1 st to the i th cells, and the absolute value of the deviation between the actual thickness of the module and the thickness of the module includes: aiming at the nth cell, obtaining the absolute value of the cell thickness deviation of the nth cell according to the cell actual thickness and the cell theoretical thickness of the nth cell; calculating the ratio of the absolute value of the thickness deviation of the battery cell of the nth battery cell to the absolute value of the thickness deviation of the module to obtain the proportion of the nth battery cell in bundling rebound; obtaining total rebound by using the bundling length and the actual thickness of the module; obtaining the cell resilience quantity of the nth cell according to the proportion of the nth cell in bundling resilience and the total resilience quantity; traversing each of the 1 st electric core to the i th electric core to obtain the electric core resilience amount of each of the 1 st electric core to the i th electric core.
With reference to the third implementation manner of the first aspect, in a fourth implementation manner of the first aspect, the obtaining the welding position of the ith electric core according to the initial position of the pole of the ith electric core and the electric core resilience amount of each electric core from the 1 st electric core to the ith electric core includes: adding half of the cell resilience of the ith cell to the sum of the cell resilience of each of the 1 st cell to the i-1 st cell to obtain the pole resilience of the ith cell; and obtaining the welding position of the ith electric core according to the initial position of the pole of the ith electric core and the pole rebound quantity of the ith electric core.
With reference to the first aspect, in a fifth implementation manner of the first aspect, before acquiring an actual thickness of the battery module, the method further includes: and adding the actual thicknesses of the battery cells of each battery module to obtain the actual thickness of the battery module.
According to a second aspect, the embodiment of the invention also provides a device for determining the welding position of the battery cell, which comprises an acquisition module, a pole initial position determining module, a rebound quantity determining module and a welding position determining module; the battery module comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the actual thickness and the theoretical thickness of each of the 1 st electric core to the i th electric core in the battery module aiming at the i th electric core of the battery module; the pole initial position determining module is used for obtaining the pole initial position of the ith electric core according to the actual thickness of each electric core from the 1 st electric core to the ith electric core; the acquisition module is also used for respectively acquiring the module actual thickness of the battery module, the module theoretical thickness of the battery module and the module thickness deviation absolute value between the module actual thickness; the acquisition module is also used for acquiring the bundling length of the battery module; the resilience amount determining module is used for obtaining the resilience amount of the electric core of each electric core from the 1 st electric core to the i th electric core according to the bundling length, the actual thickness and the theoretical thickness of the electric core of each electric core from the 1 st electric core to the i th electric core, and the absolute value of the deviation between the actual thickness of the module and the thickness of the module; the welding position determining module is used for obtaining the welding position of the ith electric core according to the initial position of the pole of the ith electric core and the electric core resilience amount of each electric core from the 1 st electric core to the ith electric core.
According to a third aspect, an embodiment of the present invention further provides an electronic device, including a memory and a processor, where the memory and the processor are communicatively connected to each other, and the memory stores computer instructions, and the processor executes the computer instructions, thereby executing the method for determining a position of a die bonding according to the first aspect or any implementation manner of the first aspect.
According to a fourth aspect, an embodiment of the present invention further provides a method for manufacturing a battery module, including the steps of: measuring the actual thickness of N electric cores, and bundling the N electric cores to obtain a battery module; obtaining a welding position of each cell in the battery module according to the first aspect or the method for determining a welding position of a cell in any implementation manner of the first aspect; and sending the welding position of each electric core in the battery module to a welding mechanism/module moving mechanism so that the welding mechanism/module moving mechanism welds according to the welding position of each electric core in the battery module.
With reference to the fourth aspect, in a first embodiment of the fourth aspect, bundling the N electrical cells to obtain a battery module includes: and bundling the N electric cores according to a thickness measurement sequence to obtain the battery module.
According to the method and the device for determining the welding position of the battery cell, the electronic equipment and the preparation method of the battery module, provided by the embodiment of the invention, the actual thickness of each battery cell forming the battery module is obtained, the welding position of the battery cell can be obtained through calculation, and the welding of the battery cell can be guided according to the obtained welding position of the battery cell, so that the problem that the welding position is not at the theoretical position due to the thickness difference of each battery cell can be solved even under the condition of not photographing and addressing; meanwhile, the problems that the automatic production process of the existing battery module is complex and labor is wasted can be solved.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and should not be construed as limiting the invention in any way, in which:
fig. 1 is a flow chart of a method for determining a welding position of a battery cell according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a battery module in which battery cells are stacked;
fig. 3 is a schematic structural diagram of a device for determining a welding position of a battery cell according to embodiment 2 of the present invention;
fig. 4 is a flow chart of a method for manufacturing a battery module according to embodiment 3 of the present invention;
fig. 5 is a schematic view of a welding process of the battery module;
the 1 st electric core pole is in an extrusion state in the X direction; 2. the 2 nd electric core pole is in the extrusion state position in the X direction; 3. the N-1 th electric core pole is in the extrusion state in the X direction; 4. the position of the Nth electric core electrode post in the extrusion state in the X direction; 5. welding a structure; 6. an X-direction positioning mechanism; 7. and a Y-direction positioning structure.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Example 1
The embodiment 1 of the invention provides a method for determining a welding position of a battery cell. Fig. 1 is a flow chart of a method for determining a position of a battery cell welding in embodiment 1 of the present invention, and as shown in fig. 1, the method for determining a position of a battery cell welding in embodiment 1 of the present invention includes the following steps:
s101: and aiming at the ith electric core of the battery module, acquiring the actual thickness and the theoretical thickness of each electric core from the 1 st electric core to the ith electric core in the battery module.
Specifically, the actual thickness of the battery cell can be measured by a battery cell thickness measuring device in the prior art.
S102: and obtaining the initial position of the pole of the ith battery cell according to the actual thickness of the battery cell from the 1 st battery cell to each battery cell in the ith battery cell.
Specifically, the initial position of the electrode post of the ith battery cell obtained according to the actual thickness of the battery cell of each of the 1 st battery cell to the ith battery cell may adopt the following technical scheme: and adding half of the actual thickness of the electric core of the ith electric core to the sum of the actual thicknesses of the electric cores of all the electric cores from the 1 st electric core to the i-1 th electric core in the battery module to obtain the initial position of the pole of the ith electric core.
Fig. 2 is a schematic diagram of stacking the electric cells into a battery module, as shown in fig. 2, stacking N electric cells with measured actual thickness into a battery module according to a measurement sequence, wherein the position of the 1 st electric cell in the extrusion state in the X direction (i.e. the initial position of the pole of the 1 st electric cell) is S1/2; the position of the 2 nd electric core in the X-direction extrusion state (namely the initial position of the pole of the 2 nd electric core) is S1+S2/2; the position of the N-1 th electric core in the X direction extrusion state (namely the initial position of the pole of the N-1 st electric core) is S1+S2+ … … +S (N-2) + S S (N-1)/2; the position of the Nth cell in the X-direction extrusion state (namely the initial position of the polar column of the Nth cell) is S1+S2+ … … +S (N-1) +SN/2.
S103: and respectively obtaining the module actual thickness of the battery module, the module theoretical thickness of the battery module and the module thickness deviation absolute value between the module actual thickness.
Further, before obtaining the actual thickness of the battery module, the method further includes: and adding the actual thicknesses of the battery cells of each battery module to obtain the actual thickness of the battery module.
For example, assuming that the battery module includes N cells, the actual thickness SM of the battery module is: sm=s1+s2+s3+ … … +s (N-1) +sn, where S represents the theoretical cell thickness of the ith cell, 1.ltoreq.i.ltoreq.n. At this time, the actual thickness SM of the battery module is the actual thickness in the pressed state after stacking N cells into the battery module.
Further, before the absolute value of the deviation of the module thickness between the module theoretical thickness of the battery module and the module actual thickness, the method further comprises: obtaining the absolute value of the deviation of the thickness of the electric core of each electric core in the battery module according to the actual thickness and the theoretical thickness of the electric core of each electric core in the battery module; and adding the absolute values of the cell thickness deviations of all the cells in the battery module to obtain the absolute value of the module thickness deviation of the battery module.
For example, for the ith cell, the cell thickness deviation value is Δi=si—s, where Si represents the actual cell thickness of the ith cell and S represents the theoretical cell thickness of the ith cell. Assuming that the battery module includes N cells, the absolute value Δm of the module thickness deviation of the battery module is: Δm= |Δ1|| Delta2|+|Delta3| + … … + |delta (N-1|) +delta N|, i is more than or equal to 1 and N is more than or equal to N.
S104: and obtaining the bundling length of the battery module.
In the actual production process, the die set is bound by the steel belt after extrusion, the length of the steel belt is fixed and slightly longer than the length of the die set in an extrusion state, so that the die set rebounds to tension the steel belt after extrusion is released. Specifically, the bundling length of the battery module may be equivalent to the length of the steel strip.
S105: and obtaining the cell resilience of each of the 1 st to i th cells according to the bundling length, the actual thickness and the theoretical thickness of each of the 1 st to i th cells, and the absolute deviation value of the actual thickness and the thickness of the module.
As described above, in the actual production process, the die set is bound by the steel strip after extrusion, the length of the steel strip is fixed and slightly longer than the die set length in the extrusion state, so that the die set is rebound to tension the steel strip after the extrusion is released. It is therefore necessary to calculate the positional deviation of the cells due to the spring back.
Specifically, according to the bundling length, the actual thickness and the theoretical thickness of each of the 1 st to i th electric cores, the actual thickness of the module and the absolute value of the deviation of the thickness of the module, the rebound amount of each of the 1 st to i th electric cores may be obtained by adopting the following technical scheme: aiming at the nth cell, obtaining the absolute value of the cell thickness deviation of the nth cell according to the cell actual thickness and the cell theoretical thickness of the nth cell; calculating the ratio of the absolute value of the thickness deviation of the battery cell of the nth battery cell to the absolute value of the thickness deviation of the module to obtain the proportion of the nth battery cell in bundling rebound; obtaining total rebound by using the bundling length and the actual thickness of the module; obtaining the cell resilience quantity of the nth cell according to the proportion of the nth cell in bundling resilience and the total resilience quantity; traversing each of the 1 st electric core to the i th electric core to obtain the electric core resilience amount of each of the 1 st electric core to the i th electric core. Wherein n is more than or equal to 1 and i is more than or equal to 1.
For example, for the ith cell, the cell resilience of the cell can be obtained by using the formula i Δi/Δm=xi/Δ; the delta i is the difference between the actual thickness of the battery cell of the ith battery cell and the theoretical thickness of the battery cell, the delta M is the module thickness deviation value of the battery module, the xi is the resilience of the battery cell of the ith battery cell, and the delta is the difference between the bundling length and the actual thickness of the battery module.
S106: and obtaining the welding position of the ith electric core according to the initial position of the pole of the ith electric core and the electric core resilience amount of each electric core from the 1 st electric core to the ith electric core.
Specifically, the welding position of the ith electric core obtained according to the initial position of the pole of the ith electric core and the electric core resilience amount of each electric core from the 1 st electric core to the ith electric core may be as follows: adding half of the cell resilience of the ith cell to the sum of the cell resilience of each of the 1 st cell to the i-1 st cell to obtain the pole resilience of the ith cell; and obtaining the welding position of the ith electric core according to the initial position of the pole of the ith electric core and the pole rebound quantity of the ith electric core.
For example, for the ith cell, the welding position Xi is: xi= Σs (i-1) +si/2++Δxi/2+Σx (i-1). The initial position of the pole of the ith cell embodied by Sigma S (i-1) and Si/2 in the formula; x i/2+ Σx (i-1) represents the pole resilience of the ith cell.
Therefore, according to the method for determining the welding position of the battery cell provided by the embodiment 1 of the invention, the actual thickness of each battery cell forming the battery module is obtained, the welding position of the battery cell can be obtained through calculation, and the welding of the battery cell can be guided according to the obtained welding position of the battery cell, so that the problem that the welding position is not at the theoretical position due to the thickness difference of each battery cell can be solved even under the condition of not photographing and addressing.
That is, in order to improve the current situation that the current battery module production line has more and miscellaneous processes, the pole addressing and photographing process is cancelled, the thickness measurement of the battery core is changed into quantitative measurement and the thickness data is stored, and then the thickness dimension of the battery core is related to the stacking sequence, so that the deviation of each pole relative to the theoretical position can be calculated based on a certain reference, and the position information is further transmitted to the BUSBAR welding positioning mechanism, so that the BUABAR welding position can be still found under the condition of not photographing. After the passive column is taken for addressing and photographing, the working procedures of manually operated binding tape, BUSBAR placement and the like can be changed into directly adjacent working procedures, and the working procedures can be further integrated at one position and completed by one or more operators, so that the simplification of the production line working procedures and the improvement of the personnel utilization rate are realized.
Example 2
Corresponding to embodiment 1 of the present invention, embodiment 2 of the present invention provides a device for determining a welding position of a battery cell. Fig. 3 is a schematic structural diagram of a device for determining a welding position of a battery cell according to embodiment 2 of the present invention, and as shown in fig. 3, the device for determining a welding position of a battery cell according to embodiment 2 of the present invention includes an acquisition module 20, a post initial position determining module 21, a springback amount determining module 22, and a welding position determining module 23.
Specifically, the obtaining module 20 is configured to obtain, for an i-th cell of the battery module, an actual cell thickness and a theoretical cell thickness of each of the 1-th cell to the i-th cell of the battery module;
a pole initial position determining module 21, configured to obtain a pole initial position of the ith cell according to an actual thickness of each of the 1 st cell to the ith cell;
the obtaining module 20 is further configured to obtain a module thickness deviation absolute value between a module actual thickness of the battery module, a module theoretical thickness of the battery module, and the module actual thickness, respectively;
the acquiring module 20 is further configured to acquire a bundling length of the battery module;
the resilience amount determining module 22 is configured to obtain the resilience amount of each of the 1 st to i th cells according to the bundling length, the actual thickness and the theoretical thickness of each of the 1 st to i th cells, and the absolute deviation value of the actual thickness and the thickness of the module;
and the welding position determining module 23 is configured to obtain a welding position of the ith cell according to the initial position of the pole of the ith cell and the cell resilience amount of each of the 1 st cell to the ith cell.
Specifically, the pole initial position determining module 21 is specifically configured to: and adding half of the actual thickness of the electric core of the ith electric core to the sum of the actual thicknesses of the electric cores of all the electric cores from the 1 st electric core to the i-1 th electric core in the battery module to obtain the initial position of the pole of the ith electric core.
Specifically, the rebound quantity determination module 22 is specifically configured to: aiming at the nth cell, obtaining the absolute value of the cell thickness deviation of the nth cell according to the cell actual thickness and the cell theoretical thickness of the nth cell; calculating the ratio of the absolute value of the thickness deviation of the battery cell of the nth battery cell to the absolute value of the thickness deviation of the module to obtain the proportion of the nth battery cell in bundling rebound; obtaining total rebound by using the bundling length and the actual thickness of the module; obtaining the cell resilience quantity of the nth cell according to the proportion of the nth cell in bundling resilience and the total resilience quantity; traversing each of the 1 st electric core to the i th electric core to obtain the electric core resilience amount of each of the 1 st electric core to the i th electric core.
Specifically, the welding position determining module 23 is specifically configured to: adding half of the cell resilience of the ith cell to the sum of the cell resilience of each of the 1 st cell to the i-1 st cell to obtain the pole resilience of the ith cell; and obtaining the welding position of the ith electric core according to the initial position of the pole of the ith electric core and the pole rebound quantity of the ith electric core.
The details of the above-mentioned device for determining the position of the electrical core welding may be understood correspondingly with reference to the corresponding relevant descriptions and effects in the embodiments shown in fig. 1 to 3, which are not repeated here.
Example 3
On the basis of embodiment 1 of the present invention, embodiment 3 of the present invention provides a method for preparing a battery module, and fig. 4 is a schematic flow chart of the method for preparing a battery module in embodiment 3 of the present invention, as shown in fig. 4, the method for preparing a battery module in embodiment 3 of the present invention includes the following steps:
s201: and measuring the actual thickness of the N electric cores, and bundling the N electric cores to obtain the battery module.
Specifically, the battery module obtained by bundling the N battery cells may adopt the following scheme: and bundling the N electric cores according to a thickness measurement sequence to obtain the battery module. It should be noted that, if stacking and bundling are not performed in the thickness measuring order, stacking and bundling are performed in the thickness measuring order, which has significant advantages in simplifying control program design, data storage and calculation.
S202: the welding position of each battery cell in the battery module is obtained by using the method for determining the welding position of the battery cell according to the embodiment 1 of the invention.
S203: and sending the welding position of each electric core in the battery module to a welding mechanism/module moving mechanism so that the welding mechanism/module moving mechanism welds according to the welding position of each electric core in the battery module.
Specifically, the welding position of each cell may be sent to a welding mechanism, and welding may be performed by movement of the welding mechanism. In the welding step, the modules may be fixed, and the BUSBAR welding may be performed by changing the positions of the modules, in addition to the welding method of completing the welding of each pole by the movement of the welding mechanism.
In practice, the deviation of the welding position mainly comes from the accumulated error in the thickness direction of the cell, so that the position in the X direction is mainly accurately positioned when describing the parameters of the actual welding position. And welding the stacked module semi-finished products at a BUSBAR welding station, wherein as shown in fig. 5, the modules are fixed and positioned in the X and Y directions respectively, and then a position actuating mechanism of a welding mechanism drives a welding head to a designated position to finish welding operation under the driving of actual position parameters of each cell which is based on thickness measurement and is subjected to calculation processing.
That is, the working principle of the preparation method of the battery module of embodiment 3 of the present invention is as follows: in order to cancel the pole addressing photographing procedure in the module assembly process, the preparation method of the battery module mainly comprises the following three steps, wherein the first step is to quantitatively measure the thickness of each battery cell and correlate the thickness information with the battery cell; and secondly, stacking the battery cells with the designed number of the modules in sequence, and corresponding the arrangement sequence to the thickness measurement sequence of the first step, wherein the battery cells contained in the modules are sequentially circulated by taking the number of the battery cells contained in the modules as a period. And then calculating the offset of each cell based on the theoretical position, transmitting the offset to a position controller of a welding mechanism, and thirdly, welding the welding mechanism according to the revised position under the driving of the position controller, thereby eliminating the problem that the welding position is not at the theoretical position due to the thickness difference of each cell even under the condition of addressing without photographing.
Therefore, the preparation method of the battery module in the embodiment 3 of the invention eliminates pole addressing and photographing, positions the welding position by calculating the actual position deviation of the battery core, reduces the material cost of the module line, remarkably simplifies the production line process, and besides, the labor stations are reduced, so that the non-adjacent manual operation process in the production line becomes directly adjacent, and the manual operation process can be further integrated.
Example 4
Embodiments of the present invention also provide an electronic device that may include a processor and a memory, where the processor and memory may be connected by a bus or other means.
The processor may be a central processing unit (Central Processing Unit, CPU). The processor may also be any other general purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof.
The memory, as a non-transitory computer readable storage medium, may be used to store a non-transitory software program, a non-transitory computer executable program, and modules, such as program instructions/modules (e.g., the acquisition module 20, the post initial position determination module 21, the rebound amount determination module 22, and the welding position determination module 23 shown in fig. 4) corresponding to the method for determining a position of a battery cell in an embodiment of the present invention. The processor executes the non-transitory software programs, instructions and modules stored in the memory to perform various functional applications and data processing of the processor, i.e., to implement the method for determining a location of a die weld in the method embodiments described above.
The memory may include a memory program area and a memory data area, wherein the memory program area may store an operating system, at least one application program required for a function; the storage data area may store data created by the processor, etc. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory may optionally include memory located remotely from the processor, the remote memory being connectable to the processor through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory and when executed by the processor perform the method of determining the position of a die bond in the embodiment shown in fig. 1-3.
The specific details of the electronic device may be understood in reference to the corresponding related descriptions and effects in the embodiments shown in fig. 1 to 3, which are not repeated herein.
It will be appreciated by those skilled in the art that implementing all or part of the above-described embodiment method may be implemented by a computer program to instruct related hardware, where the program may be stored in a computer readable storage medium, and the program may include the above-described embodiment method when executed. Wherein the storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a Flash Memory (Flash Memory), a Hard Disk (HDD), or a Solid State Drive (SSD); the storage medium may also comprise a combination of memories of the kind described above.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations are within the scope of the invention as defined by the appended claims.
Claims (7)
1. A method for determining a location of a die bond, comprising:
aiming at an ith electric core of a battery module, acquiring the actual thickness and the theoretical thickness of each electric core from the 1 st electric core to the ith electric core in the battery module;
adding half of the actual thickness of the electric core of the ith electric core to the sum of the actual thicknesses of the electric cores of all the electric cores from the 1 st electric core to the i-1 st electric core in the battery module to obtain the initial position of the pole of the ith electric core;
respectively obtaining the actual thickness of the battery module, the theoretical thickness of the battery module and the absolute value of the module thickness deviation between the actual thickness of the battery module;
acquiring the bundling length of the battery module;
aiming at the nth cell from the 1 st cell to the ith cell, wherein n is more than or equal to 1 and less than or equal to i, and obtaining the absolute value of the cell thickness deviation of the nth cell according to the actual cell thickness and the theoretical cell thickness of the nth cell;
calculating the ratio of the absolute value of the thickness deviation of the battery cell of the nth battery cell to the absolute value of the thickness deviation of the module to obtain the proportion of the nth battery cell in bundling rebound;
obtaining total rebound by using the bundling length and the actual thickness of the module;
obtaining the cell resilience quantity of the nth cell according to the proportion of the nth cell in bundling resilience and the total resilience quantity;
traversing each of the 1 st to i th cells to obtain the cell resilience of each of the 1 st to i th cells;
adding half of the cell resilience of the ith cell to the sum of the cell resilience of each of the 1 st cell to the i-1 st cell to obtain the pole resilience of the ith cell;
and obtaining the welding position of the ith electric core according to the initial position of the pole of the ith electric core and the pole rebound quantity of the ith electric core.
2. The method according to claim 1, further comprising, before the absolute value of the module thickness deviation between the module theoretical thickness of the battery module and the module actual thickness:
obtaining the absolute value of the deviation of the thickness of the electric core of each electric core in the battery module according to the actual thickness and the theoretical thickness of the electric core of each electric core in the battery module;
and adding the absolute values of the cell thickness deviations of all the cells in the battery module to obtain the absolute value of the module thickness deviation of the battery module.
3. The method according to claim 1, further comprising, before acquiring the actual thickness of the battery module:
and adding the actual thicknesses of the battery cells of each battery module to obtain the actual thickness of the battery module.
4. A die-bonding position determining apparatus, comprising:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the actual thickness and the theoretical thickness of each cell from the 1 st cell to the i th cell in the battery module aiming at the i th cell of the battery module;
the pole initial position determining module is used for obtaining the pole initial position of the ith electric core according to the actual thickness of each electric core from the 1 st electric core to the ith electric core;
the acquisition module is further used for respectively acquiring the actual thickness of the battery module, the theoretical thickness of the battery module and the absolute value of the module thickness deviation between the actual thickness of the battery module;
the acquisition module is also used for acquiring the bundling length of the battery module;
the resilience amount determining module is used for obtaining the resilience amount of the electric core of each electric core from the 1 st electric core to the i th electric core according to the bundling length, the actual thickness and the theoretical thickness of the electric core of each electric core from the 1 st electric core to the i th electric core, and the absolute value of the deviation between the actual thickness of the module and the thickness of the module;
the welding position determining module is used for obtaining the welding position of the ith electric core according to the initial position of the pole of the ith electric core and the electric core resilience amount of each electric core from the 1 st electric core to the ith electric core;
the obtaining the initial position of the pole of the ith battery cell according to the actual thickness of the battery cell of each battery cell from the 1 st battery cell to the ith battery cell comprises:
adding half of the actual thickness of the electric core of the ith electric core to the sum of the actual thicknesses of the electric cores of all the electric cores from the 1 st electric core to the i-1 st electric core in the battery module to obtain the initial position of the pole of the ith electric core;
the obtaining the rebound amount of each of the 1 st to the i th cells according to the bundling length, the actual thickness and the theoretical thickness of each of the 1 st to the i th cells, the actual thickness of the module and the absolute value of the deviation of the thickness of the module includes:
aiming at the nth cell from the 1 st cell to the ith cell, wherein n is more than or equal to 1 and less than or equal to i, and obtaining the absolute value of the cell thickness deviation of the nth cell according to the actual cell thickness and the theoretical cell thickness of the nth cell;
calculating the ratio of the absolute value of the thickness deviation of the battery cell of the nth battery cell to the absolute value of the thickness deviation of the module to obtain the proportion of the nth battery cell in bundling rebound;
obtaining total rebound by using the bundling length and the actual thickness of the module;
obtaining the cell resilience quantity of the nth cell according to the proportion of the nth cell in bundling resilience and the total resilience quantity;
traversing each of the 1 st to i th cells to obtain the cell resilience of each of the 1 st to i th cells;
the obtaining the welding position of the ith electric core according to the initial position of the pole of the ith electric core and the electric core resilience of each electric core from the 1 st electric core to the ith electric core comprises the following steps:
adding half of the cell resilience of the ith cell to the sum of the cell resilience of each of the 1 st cell to the i-1 st cell to obtain the pole resilience of the ith cell;
and obtaining the welding position of the ith electric core according to the initial position of the pole of the ith electric core and the pole rebound quantity of the ith electric core.
5. An electronic device, comprising:
the battery cell welding position determining method according to any one of claims 1-3, wherein the memory and the processor are in communication connection, the memory stores computer instructions, and the processor executes the computer instructions.
6. A method of manufacturing a battery module, comprising:
measuring the actual thickness of N electric cores, and bundling the N electric cores to obtain a battery module;
a welding position of each cell in the battery module is obtained by the cell welding position determining method according to any one of claims 1-3;
and sending the welding position of each electric core in the battery module to a welding mechanism/module moving mechanism so that the welding mechanism/module moving mechanism welds according to the welding position of each electric core in the battery module.
7. The method of claim 6, wherein bundling the N cells to obtain a battery module comprises:
and bundling the N electric cores according to a thickness measurement sequence to obtain the battery module.
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| CN117020501B (en) * | 2023-10-08 | 2024-02-23 | 宁德时代新能源科技股份有限公司 | Pole addressing method and addressing system |
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