Lithium iron phosphate battery and curve matching method

Abstract

The invention discloses a lithium iron phosphate battery and a curve matching method, and relates to the technical field of lithium iron phosphate batteries, the lithium iron phosphate battery comprises a battery bin and a partition plate assembly, plug board grooves are uniformly distributed in the battery bin, and the partition plate assembly is inserted in the plug board grooves; the main heating partition plate is provided with an induction contact piece in the middle of the side face where the hollow rubber ring is located, and a bearing supporting plate is fixed to the bottom of the side face of the main heating partition plate. According to the lithium iron phosphate battery and the curve matching method, the auxiliary heating partition plate and the main heating partition plate are used as partition plates for separating the battery bodies, and when the battery expands and deforms, a hollow rubber ring is compressed to trigger an induction contact piece, so that the deformation position of the battery can be quickly known; and the partition plate and the battery body with swelling deformation can be drawn out together only by lifting the lifting handle after the motor connecting piece is removed, so that the defective battery can be quickly and conveniently drawn out, and the intact single batteries and the defective battery can be quickly classified.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium iron phosphate batteries, in particular to a lithium iron phosphate battery and a curve matching method. Background Art

[0002] Lithium iron phosphate battery is a lithium-ion battery with lithium iron phosphate as the positive electrode material and graphite or carbon as the negative electrode material. It is a type of lithium battery family and is widely used as a car battery due to its high safety, long cycle life and good thermal stability.

[0003] When existing lithium iron phosphate batteries are used as automotive batteries, they are often grouped into a battery pack by curve matching. However, if an individual battery in the battery pack expands and deforms, it will inevitably squeeze the adjacent batteries. Although current monitoring methods can monitor the battery status, it is difficult to easily remove the deformed battery because the batteries in the battery pack are tightly assembled.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a lithium iron phosphate battery and a curve matching method are proposed. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a lithium iron phosphate battery and a curve matching method, which solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a lithium iron phosphate battery, comprising a battery compartment and a partition assembly, the battery compartment is evenly distributed with plug-in slots, the partition assembly is inserted into the plug-in slots, the partition assembly comprises a main heating partition, a hollow rubber ring, an auxiliary heating partition, an induction contact piece and a bearing pallet, a hollow rubber ring is arranged on the side of the main heating partition, and a secondary heating partition is fixed on the side of the hollow rubber ring away from the main heating partition, the main heating partition is provided with an induction contact piece in the middle of the side where the hollow rubber ring is located, a bearing pallet is fixed on the bottom of the side of the main heating partition, and the battery body is arranged on the surface of the bearing pallet.

[0007] Furthermore, the bottom of the auxiliary heating baffle is higher than the bottom of the main heating baffle, and the auxiliary heating baffle is elastically connected to the main heating baffle via a hollow rubber ring.

[0008] Furthermore, the support plate is vertically distributed with respect to the main heating partition, and two sides of the battery body are respectively in contact with the auxiliary heating partition and the main heating partition.

[0009] Furthermore, the partition assembly also includes a lifting handle, and the top of the main heating partition and the auxiliary heating partition are both fixed with a lifting handle.

[0010] Furthermore, detachable electrode assemblies are arranged on both sides of the top surface of the battery body, and the detachable electrode assemblies include electrode columns and connecting piece insertion grooves, and the connecting piece insertion grooves are opened on the surfaces of the electrode columns.

[0011] Furthermore, the detachable electrode assembly also includes a right-angle support column, and a right-angle support column is fixed to the top surface of the battery body on one side of the electrode column.

[0012] Furthermore, the detachable electrode assembly also includes a clamping block, the top of the right-angle support column is fixed with the clamping block, and a slot is provided on the surface of the clamping block.

[0013] Furthermore, the detachable electrode assembly also includes an elastic insertion rod, and the elastic insertion rod is penetrated inside the clamping block.

[0014] Furthermore, a bridge-type connecting piece is inserted into the connecting piece insertion groove, and insertion holes are provided on both sides of the top of the bridge-type connecting piece, and the elastic insertion rod passes through the inside of the insertion hole.

[0015] A curve matching method for a lithium iron phosphate battery, which is applied to the above-mentioned lithium iron phosphate battery, and the curve matching method for the lithium iron phosphate battery comprises the following steps:

[0016] Step 1: Test the single battery to collect characteristic data, including charge and discharge curve, internal resistance test, capacity test, rate performance test, and temperature performance test;

[0017] Step 2: Screen each single battery according to the test results to screen out unqualified batteries, including but not limited to batteries with a capacity deviation greater than a threshold, an internal resistance higher than a threshold, and a self-discharge rate faster than a threshold;

[0018] Step 3: After removing the unqualified batteries, perform curve matching on the remaining batteries and group the batteries with similar voltage and capacity curve shapes, as follows:

[0019] Use mathematical methods such as Euclidean distance and cosine similarity to calculate the similarity between curves;

[0020] Compare key intervals of the voltage platform, such as the discharge platform and cut-off voltage point, to ensure consistency;

[0021] Further refine the grouping based on parameters such as capacity and internal resistance, and prioritize batteries with similar capacity and internal resistance to be assigned to the same group;

[0022] Step 4: Assemble the single cells of the same group, i.e. the battery body, into the battery compartment.

[0023] The present invention provides a lithium iron phosphate battery and a curve matching method, which have the following beneficial effects:

[0024] 1. The lithium iron phosphate battery and the curve assembly method use the auxiliary heating partition and the main heating partition as partitions to separate the battery bodies. When a battery expands and deforms, the hollow rubber ring is compressed to trigger the sensing contact piece, so that the deformation position of the battery is quickly known, and when removing the problem battery, it is only necessary to release the motor connecting piece and lift the lifting handle to pull out the partition together with the expanded and deformed battery body, so that the problem battery can be quickly and conveniently pulled out, thereby quickly classifying the intact single cells and the problem batteries.

[0025] 2. For the lithium iron phosphate battery and the curve assembly method, when installing the bridge-type connecting piece between two adjacent battery bodies, it is only necessary to pull out the elastic insertion rod and then insert the bridge-type connecting piece into the connecting piece insertion groove on the surface of the electrode column, and then loosen the elastic insertion rod to allow it to pass through the insertion hole to complete the installation. This installation method allows the connecting piece used between the electrodes of the battery to be quickly disassembled and assembled. Combined with the above-mentioned method of extracting the problem battery, it can quickly solve the problem that the adjacent batteries are connected by connecting pieces, making it difficult to extract the problem battery separately. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of a lithium iron phosphate battery of the present invention;

[0027] Figure 2 A schematic diagram of the battery compartment structure of a lithium iron phosphate battery of the present invention;

[0028] Figure 3 A schematic diagram of the battery body structure of a lithium iron phosphate battery of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of a main heating baffle and a secondary heating baffle of a lithium iron phosphate battery of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of a secondary heating partition of a lithium iron phosphate battery after being disassembled;

[0031] Figure 6 The present invention is a schematic diagram of the structure of a disassembled bridge-type connecting piece of a lithium iron phosphate battery.

[0032] In the figure: 1. Battery compartment; 2. Plug-in slot; 3. Partition assembly; 301. Main heating partition; 302. Hollow rubber ring; 303. Auxiliary heating partition; 304. Induction contact piece; 305. Load-bearing tray; 306. Lifting handle; 4. Battery body; 5. Disassembled electrode assembly; 501. Electrode column; 502. Connecting piece plug-in slot; 503. Right-angle support column; 504. Clamping block; 505. Elastic plug-in rod; 6. Bridge-type connecting piece; 7. Socket. DETAILED DESCRIPTION

[0033] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0034] like Figure 1-Figure 6 As shown, the present invention provides a technical solution: a lithium iron phosphate battery, comprising a battery compartment 1 and a partition assembly 3, the battery compartment 1 is evenly distributed with plug-in slots 2, the partition assembly 3 is inserted in the plug-in slots 2, the partition assembly 3 comprises a main heating partition 301, a hollow rubber ring 302, an auxiliary heating partition 303, a sensing contact piece 304 and a bearing support plate 305, a hollow rubber ring 302 is arranged on the side of the main heating partition 301, and the auxiliary heating partition 303 is fixed on the side of the hollow rubber ring 302 away from the main heating partition 301, and the main heating partition 301 is provided with a sensing contact piece 304 in the middle of the side where the hollow rubber ring 302 is located. A bearing support plate 305 is fixed to the bottom of the side of the main heating baffle 301, and a battery body 4 is arranged on the surface of the bearing support plate 305. The bottom of the auxiliary heating baffle 303 is higher than the bottom of the main heating baffle 301, and the auxiliary heating baffle 303 is elastically connected to the main heating baffle 301 through a hollow rubber ring 302. The bearing support plate 305 and the main heating baffle 301 are vertically distributed, and the two sides of the battery body 4 are respectively fitted with the auxiliary heating baffle 303 and the main heating baffle 301. The baffle assembly 3 also includes a lifting handle 306, and the tops of the main heating baffle 301 and the auxiliary heating baffle 303 are both fixed with a lifting handle 306;

[0035] The specific operation is as follows: a single auxiliary heating baffle 303 and a single main heating baffle 301 are grouped together, and the number of groups is one more than the number of battery bodies 4. The auxiliary heating baffle 303 of the extra group is the same height as the main heating baffle 301 and is not provided with a supporting plate 305, so the supporting plate 305 and the battery body 4 are arranged one-to-one;

[0036] In actual installation, firstly, each group of auxiliary heating baffles 303 and the main heating baffle 301 are inserted into the inserting plate slot 2, and the group of auxiliary heating baffles 303 and the main heating baffle 301 of the same height are inserted to the side, and then the battery body 4 arranged in a curve is inserted between each group of auxiliary heating baffles 303 and the main heating baffle 301 in turn;

[0037] When the lithium iron phosphate battery is put into use, if a battery body 4 expands and deforms, the auxiliary heating baffle 303 or the main heating baffle 301 that is in contact with the deformed side of the battery body 4 is subjected to force, so that the hollow rubber ring 302 is compressed. At this time, the auxiliary heating baffle 303 is close to the main heating baffle 301 or the main heating baffle 301 is close to the auxiliary heating baffle 303, so that the sensing contact 304 is triggered. Based on the signal fed back by the sensing contact 304, the position of the deformed battery body 4 in the lithium iron phosphate battery can be quickly known. After that, after releasing the top electrode connecting piece of the battery body 4, the auxiliary heating baffle 303 and the main heating baffle 301 are pulled out by lifting the lifting handle 306, and the supporting plate 305 rises accordingly, so that the battery body 4 that has expanded and deformed is pulled out together;

[0038] When the lithium iron phosphate battery is put into use in a low-temperature environment, the auxiliary heating baffle 303 and the main heating baffle 301 are connected to a small ternary lithium battery through a wire. The working range of the ternary lithium battery is -20 degrees Celsius to 60 degrees Celsius, so it is more suitable for low-temperature environments than the lithium iron phosphate battery. The small ternary lithium battery supplies power to make the auxiliary heating baffle 303 and the main heating baffle 301 heat up, thereby providing an adaptive working environment for the battery body 4 to prevent the battery body 4 from being affected by the low temperature and seriously affecting the endurance and service life of the car. The small ternary lithium battery only participates in supplying power to the auxiliary heating baffle 303 and the main heating baffle 301, and does not participate in the energy of the car, so that its volume can be minimized;

[0039] Based on the above description, the present invention uses the auxiliary heating partition 303 and the main heating partition 301 as partitions to separate each battery body 4. When a battery expands and deforms, the hollow rubber ring 302 is compressed to trigger the sensing contact 304, so that the deformation position of the battery can be quickly known, and when removing the problematic battery, it is only necessary to release the motor connecting piece and then lift the lifting handle 306 to pull out the partition together with the expanded and deformed battery body 4, so that the problematic battery can be quickly and conveniently pulled out, thereby quickly classifying intact single cells and problematic batteries.

[0040] like Figure 1-Figure 6As shown, both sides of the top surface of the battery body 4 are provided with detachable electrode assemblies 5, the detachable electrode assembly 5 includes an electrode column 501 and a connecting piece plug-in slot 502, the surface of the electrode column 501 is provided with a connecting piece plug-in slot 502, the detachable electrode assembly 5 also includes a right-angle support column 503, a right-angle support column 503 is fixed on one side of the electrode column 501 on the top surface of the battery body 4, the detachable electrode assembly 5 also includes a clamping block 504, a clamping block 504 is fixed on the top of the right-angle support column 503, and a card slot is provided on the surface of the clamping block 504, the detachable electrode assembly 5 also includes an elastic plug-in rod 505, the inside of the clamping block 504 is penetrated by the elastic plug-in rod 505, the inside of the connecting piece plug-in slot 502 is plugged with a bridge-type connecting piece 6, and the top of the bridge-type connecting piece 6 is provided with a socket 7 on both sides, and the elastic plug-in rod 505 runs through the inside of the socket 7;

[0041] The specific operation is as follows: the connection between the electrode and the connecting piece of the existing lithium iron phosphate battery is mostly soldered or screwed. The former is not easy to disassemble in the later stage, and the latter has the risk of loosening in the later stage. In addition, the disassembly operation is repeated due to the large number of single cells in a group, which is too time-consuming and laborious.

[0042] In the present invention, when installing the bridge-type connecting piece 6 on the electrode column 501 of the adjacent battery body 4, it is only necessary to first pull the elastic plug-in rod 505 so that there is no foreign matter in the card slot on the surface of the clamping block 504, and then press the bridge-type connecting piece 6 down along the card slot so that its bottom is pressed into the inside of the connecting piece plug-in slot 502 on the surface of the electrode column 501. At this time, the bottom side of the bridge-type connecting piece 6 is tightly fitted with the electrode column 501, and the sockets 7 on both sides of the top of the bridge-type connecting piece 6 are aligned with the elastic plug-in rod 505. Then, the elastic plug-in rod 505 is loosened to allow it to pass through the socket 7 under the action of elasticity to complete the installation of the bridge-type connecting piece 6.

[0043] Similarly, when the problematic battery is extracted using the above method, the above operation is first performed in reverse to remove the bridge-type connecting piece 6, so that the problematic battery is single-membered and then the problematic battery can be quickly and conveniently extracted;

[0044] Based on the above description, when installing the bridge-type connecting piece 6 on two adjacent battery bodies 4 of the present invention, it is only necessary to pull out the elastic insertion rod 505 and then insert the bridge-type connecting piece 6 into the connecting piece insertion groove 502 on the surface of the electrode column 501, and then loosen the elastic insertion rod 505 to allow it to pass through the insertion hole 7 to complete the installation. This installation method enables the connecting piece used between the electrodes of the battery to be quickly disassembled and assembled. Combined with the above-mentioned method of extracting problematic batteries, the problem of adjacent batteries being connected by connecting pieces, which makes it difficult to extract problematic batteries individually, can be quickly solved.

[0045] A curve matching method for a lithium iron phosphate battery, which is applied to the above-mentioned lithium iron phosphate battery, comprises the following steps:

[0046] Step 1: Test the single battery to collect characteristic data, including charge and discharge curve, internal resistance test, capacity test, rate performance test, and temperature performance test;

[0047] Step 2: Screen each single battery according to the test results to screen out unqualified batteries, including but not limited to batteries with a capacity deviation greater than a threshold, an internal resistance higher than a threshold, and a self-discharge rate faster than a threshold;

[0048] Step 3: After removing the unqualified batteries, perform curve matching on the remaining batteries and group the batteries with similar voltage and capacity curve shapes, as follows:

[0049] Use mathematical methods such as Euclidean distance and cosine similarity to calculate the similarity between curves;

[0050] Compare key intervals of the voltage platform, such as the discharge platform and cut-off voltage point, to ensure consistency;

[0051] Further refine the grouping based on parameters such as capacity and internal resistance, and prioritize batteries with similar capacity and internal resistance to be assigned to the same group;

[0052] Step 4: Assemble the single cells of the same group, namely the battery body 4 , into the battery compartment 1 .

[0053] In summary, when the lithium iron phosphate battery and the curve assembly method are used, first in actual installation, each group of auxiliary heating partitions 303 and the main heating partition 301 are first inserted into the plug-in slot 2, and the group of auxiliary heating partitions 303 and the main heating partition 301 of the same height are inserted to the side, and then the battery body 4 through the curve assembly is sequentially inserted between each group of auxiliary heating partitions 303 and the main heating partition 301;

[0054] When installing the bridge-type connecting piece 6 on the electrode column 501 of the adjacent battery body 4, it is only necessary to first pull the elastic insertion rod 505 so that there is no foreign matter in the card slot on the surface of the clamping block 504, and then press the bridge-type connecting piece 6 down along the card slot so that its bottom is pressed into the inside of the connecting piece insertion slot 502 on the surface of the electrode column 501. At this time, the bottom side of the bridge-type connecting piece 6 is tightly fitted with the electrode column 501, and the sockets 7 on both sides of the top of the bridge-type connecting piece 6 are aligned with the elastic insertion rod 505. Then, the elastic insertion rod 505 is loosened to allow it to pass through the socket 7 under the action of elasticity to complete the installation of the bridge-type connecting piece 6.

[0055] When the lithium iron phosphate battery is put into use in a low temperature environment, the auxiliary heating baffle 303 and the main heating baffle 301 are connected to a small ternary lithium battery through a wire. The working range of the ternary lithium battery is -20 degrees Celsius to 60 degrees Celsius, so it is more suitable for low temperature environments than the lithium iron phosphate battery. The small ternary lithium battery supplies power to make the auxiliary heating baffle 303 and the main heating baffle 301 heat up, thereby providing an adaptive working environment for the battery body 4 to prevent the battery body 4 from being affected by the low temperature and seriously affecting the endurance and service life of the vehicle;

[0056] If a battery body 4 expands and deforms during use, the auxiliary heating baffle 303 or the main heating baffle 301 that fits the deformed side of the battery body 4 is subjected to force, so that the hollow rubber ring 302 is compressed. At this time, the auxiliary heating baffle 303 is close to the main heating baffle 301 or the main heating baffle 301 is close to the auxiliary heating baffle 303, so that the sensing contact 304 is triggered. Based on the signal fed back by the sensing contact 304, the position of the deformed battery body 4 in the lithium iron phosphate battery can be quickly known. After that, after releasing the top electrode connecting piece of the battery body 4, the auxiliary heating baffle 303 and the main heating baffle 301 are pulled out by lifting the lifting handle 306, and the supporting plate 305 rises accordingly, so that the expanded and deformed battery body 4 is pulled out together;

[0057] Before pulling out the problematic battery, the above-mentioned operation of removing the connecting piece is reversed to remove the bridge-type connecting piece 6, so that the problematic battery is single-membered and can be pulled out quickly and conveniently.

[0058] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A lithium iron phosphate battery, comprising a battery compartment (1) and a separator assembly (3), characterized in that: The battery compartment (1) is evenly distributed with plug-in slots (2), the partition assembly (3) is inserted into the plug-in slots (2), the partition assembly (3) comprises a main heating partition (301), a hollow rubber ring (302), a secondary heating partition (303), a sensing contact sheet (304) and a bearing support plate (305), the side of the main heating partition (301) is provided with a hollow rubber ring (302), and the side of the hollow rubber ring (302) away from the main heating partition (301) is fixed with a secondary heating partition (303), the main heating partition (301) is provided with a sensing contact sheet (304) in the middle of the side where the hollow rubber ring (302) is located, the bottom of the side of the main heating partition (301) is fixed with a bearing support plate (305), and the surface of the bearing support plate (305) is provided with a battery body (4).

2. A lithium iron phosphate battery according to claim 1, characterized in that: The bottom of the auxiliary heating baffle (303) is higher than the bottom of the main heating baffle (301), and the auxiliary heating baffle (303) is elastically connected to the main heating baffle (301) via a hollow rubber ring (302).

3. A lithium iron phosphate battery according to claim 1, characterized in that: The bearing support plate (305) and the main heating baffle (301) are arranged vertically, and two sides of the battery body (4) are respectively in contact with the auxiliary heating baffle (303) and the main heating baffle (301).

4. A lithium iron phosphate battery according to claim 1, characterized in that: The baffle assembly (3) further comprises a lifting handle (306), and the tops of the main heating baffle (301) and the auxiliary heating baffle (303) are both fixed with a lifting handle (306).

5. A lithium iron phosphate battery according to claim 1, characterized in that: Both sides of the top surface of the battery body (4) are provided with detachable electrode assemblies (5), the detachable electrode assemblies (5) comprising electrode columns (501) and connecting piece insertion grooves (502), and the connecting piece insertion grooves (502) are provided on the surfaces of the electrode columns (501).

6. A lithium iron phosphate battery according to claim 5, characterized in that: The detachable electrode assembly (5) further comprises a right-angle support column (503), and a right-angle support column (503) is fixed to the top surface of the battery body (4) on one side of the electrode column (501).

7. A lithium iron phosphate battery according to claim 6, characterized in that: The detachable electrode assembly (5) further comprises a clamping block (504), the top of the right-angle support column (503) is fixed with the clamping block (504), and a slot is provided on the surface of the clamping block (504).

8. A lithium iron phosphate battery according to claim 7, characterized in that: The detachable electrode assembly (5) further comprises an elastic insertion rod (505), and the elastic insertion rod (505) is inserted into the interior of the clamping block (504).

9. A lithium iron phosphate battery according to claim 8, characterized in that: A bridge-type connecting piece (6) is inserted into the connecting piece insertion groove (502), and insertion holes (7) are provided on both sides of the top of the bridge-type connecting piece (6), and the elastic insertion rod (505) passes through the inside of the insertion hole (7).

10. A curve matching method for lithium iron phosphate batteries, applied to a lithium iron phosphate battery according to any one of claims 1 to 9, characterized in that: The curve matching method of the lithium iron phosphate battery comprises the following steps: Step 1: Test the single battery to collect characteristic data, including charge and discharge curve, internal resistance test, capacity test, rate performance test, and temperature performance test; Step 2: Screen each single battery according to the test results to screen out unqualified batteries, including but not limited to batteries with a capacity deviation greater than a threshold, an internal resistance higher than a threshold, and a self-discharge rate faster than a threshold; Step 3: After removing the unqualified batteries, perform curve matching on the remaining batteries and group the batteries with similar voltage and capacity curve shapes, as follows: Use mathematical methods such as Euclidean distance and cosine similarity to calculate the similarity between curves; Compare key intervals of the voltage platform, such as the discharge platform and cut-off voltage point, to ensure consistency; Further refine the grouping based on parameters such as capacity and internal resistance, and prioritize batteries with similar capacity and internal resistance to be assigned to the same group; Step 4: Assemble the single cells of the same group, i.e. the battery body (4), into the battery compartment (1).

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