Lithium iron phosphate battery and curve matching method

Abstract

The application 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 compartment and a partition plate assembly, the inside of the battery compartment is uniformly provided with plug-in grooves, the partition plate assembly is plugged into the plug-in grooves, the middle part of the side of the hollow rubber ring of the main heating partition plate is provided with an induction contact piece, and the side bottom of the main heating partition plate is fixedly provided with a bearing supporting plate.The lithium iron phosphate battery and the curve matching method are characterized in that the auxiliary heating partition plate and the main heating partition plate are used as partition plates to separate the battery bodies, when the battery is deformed due to swelling, the hollow rubber ring is compressed, the induction contact piece is triggered, the deformed position of the battery is quickly known, and when the problem battery is disassembled, the partition plate and the battery body with swelling deformation can be pulled out together by lifting the pull handle after the motor connecting piece is disconnected, so that the problem battery can be quickly and conveniently pulled out, and the perfect single battery and the problem battery can be quickly classified.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of lithium iron phosphate batteries, in particular to a lithium iron phosphate battery and a curve grouping method. BACKGROUND

[0002] The lithium iron phosphate battery is a lithium ion battery, uses lithium iron phosphate as a positive electrode material, and uses graphite or carbon as a negative electrode material, and is widely used as a car battery due to high safety, long cycle life and good thermal stability.

[0003] The existing lithium iron phosphate battery is often grouped into a group with small individual differences when used as a car battery, but if an individual battery in the battery group swells and deforms, it will inevitably squeeze the adjacent battery. Although the current monitoring method can monitor the battery state, it is difficult to conveniently remove the deformed battery because the batteries in the battery group are tightly assembled.

[0004] Therefore, in view of the above, the existing structure and defects are improved, and a lithium iron phosphate battery and a curve grouping method are provided. SUMMARY

[0005] In view of the deficiencies of the prior art, the application provides a lithium iron phosphate battery and a curve grouping method to solve the problems raised in the background art.

[0006] To achieve the above purpose, the following technical scheme is used: a lithium iron phosphate battery, comprising a battery compartment and a baffle assembly, the inside of the battery compartment is uniformly distributed with a plug-in slot, the baffle assembly is inserted into the plug-in slot, the baffle assembly comprises a main heating baffle, a hollow rubber ring, a secondary heating baffle, an induction contact and a bearing plate, the side of the main heating baffle is provided with a hollow rubber ring, and the side of the hollow rubber ring away from the main heating baffle is fixed with a secondary heating baffle, the main heating baffle is provided with an induction contact in the middle of the side where the hollow rubber ring is located, the side of the main heating baffle is fixed with a bearing plate at the bottom, and the surface of the bearing plate is provided with a battery body.

[0007] Further, the bottom of the secondary heating baffle is higher than the bottom of the main heating baffle, and the secondary heating baffle is elastically connected with the main heating baffle through the hollow rubber ring.

[0008] Further, the bearing plate and the main heating baffle are vertically distributed, and the two sides of the battery body are respectively attached to the secondary heating baffle and the main heating baffle.

[0009] Further, the baffle assembly further comprises a lifting handle, and the top of the main heating baffle and the secondary heating baffle is fixed with a lifting handle.

[0010] Further, the top surface of the battery body is provided with a detachable electrode assembly on both sides, the detachable electrode assembly comprises an electrode column and a connecting sheet insertion slot, and the surface of the electrode column is provided with the connecting sheet insertion slot.

[0011] Further, the detachable electrode assembly further comprises a right-angle support column, and the top surface of the battery body is fixed with the right-angle support column on one side of the electrode column.

[0012] Further, the detachable electrode assembly further comprises a clamping block, the top of the right-angle support column is fixed with the clamping block, and the surface of the clamping block is provided with a clamping groove.

[0013] Further, the detachable electrode assembly further comprises an elastic insertion rod, and the inside of the clamping block is provided with the elastic insertion rod.

[0014] Further, the inside of the connecting sheet insertion slot is inserted with a bridge-type connecting sheet, the top of the bridge-type connecting sheet is provided with a insertion hole on both sides, and the elastic insertion rod penetrates the inside of the insertion hole.

[0015] A curve matching method of a lithium iron phosphate battery, applied to the lithium iron phosphate battery, the curve matching method of the lithium iron phosphate battery comprises the following steps:

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

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

[0018] Step three: after removing the unqualified batteries, match the curves of the remaining batteries, and group the batteries with similar voltage and capacity curve shapes, specifically as follows:

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

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

[0021] Further refine the grouping according to parameters such as capacity and internal resistance, and preferentially allocate the batteries with similar capacity and internal resistance to the same group;

[0022] Step four: assemble the single batteries in the same group, i.e. the battery body, into the battery compartment.

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

[0024] 1. The lithium iron phosphate battery and curve matching method, by using a secondary heating separator and a primary heating separator as a separator to separate each battery body, when the battery expands and deforms, the hollow rubber ring is compressed to trigger the induction contact, so that the battery deformation position can be quickly known, and when the problem battery is disassembled, only the motor connecting piece is removed and the lifting handle is lifted to pull out the separator together with the battery body with swelling deformation, so that the problem battery can be quickly and conveniently pulled out, thereby quickly classifying the intact single battery and the problem battery.

[0025] 2. The lithium iron phosphate battery and curve matching method, when the bridge type connecting piece is installed between the two adjacent battery bodies, only the elastic insertion rod is pulled and then the bridge type connecting piece is inserted into the connecting piece insertion slot on the surface of the electrode column, and then the elastic insertion rod is loosened to pass through the insertion hole to complete the installation. This installation method allows the connecting piece between the electrodes of the battery to be quickly disassembled, and the above-mentioned problem battery extraction method can quickly solve the problem that the problem battery is difficult to be extracted alone due to the connection between the adjacent batteries. BRIEF DESCRIPTION OF DRAWINGS

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

[0027] Figure 2 It is a schematic diagram of the battery compartment structure of the lithium iron phosphate battery of the present application;

[0028] Figure 3 It is a schematic diagram of the battery body structure of the lithium iron phosphate battery of the present application;

[0029] Figure 4 It is a schematic diagram of the primary heating separator and the secondary heating separator of the lithium iron phosphate battery of the present application;

[0030] Figure 5 It is a schematic diagram of the secondary heating separator of the lithium iron phosphate battery of the present application after disassembly;

[0031] Figure 6 It is a schematic diagram of the bridge type connecting piece of the lithium iron phosphate battery of the present application after disassembly.

[0032] In the figure: 1, battery compartment; 2, plug-in slot; 3, separator assembly; 301, primary heating separator; 302, hollow rubber ring; 303, secondary heating separator; 304, induction contact; 305, bearing plate; 306, lifting handle; 4, battery body; 5, easily disassembled electrode assembly; 501, electrode column; 502, connecting piece insertion slot; 503, right angle support column; 504, clamping block; 505, elastic insertion rod; 6, bridge type connecting piece; 7, insertion hole. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be further described in details below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0034] As shown in the drawings, Figures 1-6 The present application provides a technical solution: a lithium iron phosphate battery, comprising a battery compartment 1 and a baffle assembly 3, the inside of the battery compartment 1 is uniformly distributed with a plug-in slot 2, the baffle assembly 3 is inserted into the inside of the plug-in slot 2, the baffle assembly 3 comprises a main heating baffle 301, a hollow rubber ring 302, a secondary heating baffle 303, an induction contact 304 and a bearing tray 305, the side of the main heating baffle 301 is provided with the hollow rubber ring 302, and the side of the hollow rubber ring 302 away from the main heating baffle 301 is fixed with the secondary heating baffle 303, the main heating baffle 301 is provided with the induction contact 304 at the middle of the side where the hollow rubber ring 302 is located, the side of the main heating baffle 301 is fixed with the bearing tray 305 at the bottom, and the surface of the bearing tray 305 is provided with a battery body 4, the bottom of the secondary heating baffle 303 is higher than the bottom of the main heating baffle 301, and the secondary heating baffle 303 is elastically connected with the main heating baffle 301 through the hollow rubber ring 302, the bearing tray 305 and the main heating baffle 301 are vertically distributed, and the two sides of the battery body 4 are respectively attached to the secondary heating baffle 303 and the main heating baffle 301, the baffle assembly 3 further comprises a pull handle 306, the top of the main heating baffle 301 and the secondary heating baffle 303 is fixed with the pull handle 306;

[0035] The specific operation is as follows: a single secondary heating baffle 303 and a single main heating baffle 301 form a group, and the number of groups is one more than the number of battery bodies 4, and the extra group has the same height of the secondary heating baffle 303 and the main heating baffle 301 without the bearing tray 305, so that the bearing tray 305 and the battery body 4 are one-to-one arranged;

[0036] In actual installation, first, each group of secondary heating baffles 303 and main heating baffles 301 are inserted into the inside of the plug-in slot 2, and the group with the same height of the secondary heating baffle 303 and the main heating baffle 301 is inserted into the most side, and then the battery body 4 with curved arrangement is inserted between each group of secondary heating baffles 303 and main heating baffles 301 in turn;

[0037] When the lithium iron phosphate battery is in use, if the battery body 4 is deformed, the hollow rubber ring 302 is compressed under the force of the deformed side of the battery body 4, and the auxiliary heating separator 303 or the main heating separator 301 is deformed, at this time, the auxiliary heating separator 303 is close to the main heating separator 301 or the main heating separator 301 is close to the auxiliary heating separator 303, so that the induction contact 304 is triggered, and the signal fed back by the induction contact 304 can quickly know the position of the deformed battery body 4 in the lithium iron phosphate battery, and then the electrode connecting piece on the top of the battery body 4 is removed, and the auxiliary heating separator 303 and the main heating separator 301 are pulled out by lifting the handle 306, and the supporting plate 305 is lifted, so that the battery body 4 with deformation is pulled out together;

[0038] When the lithium iron phosphate battery is used in a low temperature environment, the auxiliary heating separator 303 and the main heating separator 301 are connected to a small ternary lithium battery through a wire, and the working range of the ternary lithium battery is-20 degrees Celsius to 60 degrees Celsius, so that the lithium iron phosphate battery is suitable for low temperature environment, and the small ternary lithium battery is used to heat the auxiliary heating separator 303 and the main heating separator 301, so as to provide a suitable working environment for the battery body 4, so as to prevent the battery body 4 from being affected by low temperature and seriously affecting the endurance and service life of the car, wherein the small ternary lithium battery only participates in power supply for the auxiliary heating separator 303 and the main heating separator 301, and does not participate in the energy of the car, so that the volume can be minimized;

[0039] Based on the above description, the auxiliary heating separator 303 and the main heating separator 301 are used as separators to separate each battery body 4, the hollow rubber ring 302 is compressed when the battery is deformed, so that the induction contact 304 is triggered, so that the deformed position of the battery is quickly known, and when the problem battery is removed, only the motor connecting piece is removed, and the handle 306 is lifted, so that the separator and the battery body 4 with deformation are pulled out together, so that the problem battery can be quickly and conveniently pulled out, so as to quickly classify the intact single battery and the problem battery.

[0040] As Figures 1-6As shown, the top surface of the battery body 4 is provided with a detachable electrode assembly 5, the detachable electrode assembly 5 comprises an electrode column 501 and a connecting piece insertion slot 502, the surface of the electrode column 501 is provided with the connecting piece insertion slot 502, the detachable electrode assembly 5 further comprises a right-angle support column 503, the top surface of the battery body 4 is fixed with the right-angle support column 503 on one side of the electrode column 501, 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 the surface of the clamping block 504 is provided with a clamping groove, the detachable electrode assembly 5 further comprises an elastic insertion rod 505, the inside of the clamping block 504 is provided with the elastic insertion rod 505, the inside of the connecting piece insertion slot 502 is inserted with a bridge type connecting piece 6, and the top of the bridge type connecting piece 6 is provided with a insertion hole 7 on both sides, and the elastic insertion rod 505 penetrates the inside of the insertion hole 7.

[0041] Specific operation is as follows, the existing lithium iron phosphate battery, the electrode and the connecting piece are connected by tin welding or threaded fixed, the former is not easy to disassemble in the later period, and the latter has the risk of loosening in the later period, and the single battery in a group is repeatedly operated when disassembling, which is too time-consuming and laborious.

[0042] In the present application, when the bridge type connecting piece 6 is installed on the electrode column 501 of the adjacent battery body 4, only the clamping groove on the surface of the clamping block 504 is pulled to make the clamping groove free of foreign matter, and then the bridge type connecting piece 6 is pressed along the clamping groove to make the bottom of the bridge type connecting piece 6 press into 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 closely combined with the electrode column 501, and the insertion hole 7 on both sides of the top of the bridge type connecting piece 6 is aligned with the elastic insertion rod 505, then the elastic insertion rod 505 is loosened to penetrate the insertion hole 7 under the action of elasticity, and the installation of the bridge type connecting piece 6 is completed.

[0043] Similarly, when the problem battery is extracted by the above-mentioned method, the above-mentioned operation is performed in reverse to remove the bridge type connecting piece 6, so that the problem battery is individualized, and then the problem battery can be quickly and conveniently extracted.

[0044] Based on the above description, when the bridge type connecting piece 6 is installed on the adjacent two battery bodies 4, only the elastic insertion rod 505 is pulled and then the bridge type connecting piece 6 is inserted into the connecting piece insertion slot 502 on the surface of the electrode column 501, and then the elastic insertion rod 505 is loosened to penetrate the insertion hole 7, and the installation is completed. The installation method enables the connecting piece between the electrodes of the battery to be quickly disassembled and assembled, and cooperates with the above-mentioned problem battery extraction method to quickly solve the problem that the problem battery is difficult to be individually extracted due to the connection between the adjacent batteries by the connecting piece.

[0045] A curve matching method of a lithium iron phosphate battery, which is applied to the lithium iron phosphate battery.

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

[0047] Step two: according to the test results, each single battery is screened out, and the unqualified battery includes and is not limited to the battery with capacity deviation greater than the threshold, internal resistance higher than the threshold, and self-discharge rate faster than the threshold;

[0048] Step three: after removing the unqualified battery, the remaining battery is matched with the curve, and the batteries with similar voltage and capacity curve shapes are grouped, as follows:

[0049] The similarity between the curves is calculated using mathematical methods such as Euclidean distance and cosine similarity;

[0050] The key intervals of the voltage platform, such as the discharge platform and the cutoff voltage point, are compared to ensure consistency;

[0051] According to the capacity, internal resistance and other parameters, further refine the grouping, and preferentially allocate the batteries with similar capacity and internal resistance to the same group;

[0052] Step four: the single battery in the same group, i.e. the battery body 4, is assembled into the battery compartment 1.

[0053] In summary, the lithium iron phosphate battery and the curve matching method, in use, first in the actual installation, first each group of auxiliary heating separator 303 and main heating separator 301 are inserted into the plug-in slot 2 inside, and the auxiliary heating separator 303 and the main heating separator 301 are inserted into the most side, and then the battery body 4 matched by the curve is inserted between each group of auxiliary heating separator 303 and main heating separator 301;

[0054] When installing the over-bridge connecting piece 6 on the electrode column 501 of the adjacent battery body 4, only the elastic plug-in rod 505 is pulled to make the clamping block 504 surface card slot without foreign matter, and then the over-bridge connecting piece 6 is pressed along the card slot to make its bottom press into the connecting piece plug-in slot 502 inside the electrode column 501 surface, at this time the over-bridge connecting piece 6 bottom side surface and the electrode column 501 are closely attached, and the over-bridge connecting piece 6 top two sides of the plug hole 7 and the elastic plug-in rod 505 are aligned, then the elastic plug-in rod 505 is loosened to pass through the plug hole 7 under the action of elasticity, the installation of the over-bridge connecting piece 6 is completed;

[0055] And in the lithium iron phosphate battery is put into use, and in the lithium iron phosphate battery is put into use in low temperature environment, the auxiliary heating partition plate 303, the main heating partition plate 301 are connected with small ternary lithium battery by wire, the working range of ternary lithium battery is-20 degrees Celsius to 60 degrees Celsius, so that the lithium iron phosphate battery is suitable for low temperature environment, and the small ternary lithium battery is powered to make the auxiliary heating partition plate 303, the main heating partition plate 301 heat, so as to provide the working environment for the battery body 4, so as to prevent the battery body 4 from being affected by low temperature and seriously affecting the endurance and service life of the automobile;

[0056] If there is a battery body 4 that is deformed during use, the auxiliary heating partition plate 303 or the main heating partition plate 301 that is attached to the deformed side of the battery body 4 will be stressed, causing the hollow rubber ring 302 to be compressed. At this time, the auxiliary heating partition plate 303 is close to the main heating partition plate 301 or the main heating partition plate 301 is close to the auxiliary heating partition plate 303, thereby causing the inductive contact 304 to be triggered. Based on the signal feedback by the inductive contact 304, the position of the deformed battery body 4 in the lithium iron phosphate battery can be quickly known. After the top electrode connecting piece of the battery body 4 is removed, the auxiliary heating partition plate 303 and the main heating partition plate 301 are extracted by lifting the pull handle 306, and the bearing plate 305 is lifted at the same time, thereby extracting the battery body 4 that is deformed together.

[0057] And before extracting the problem battery, the above-mentioned connecting piece operation is performed in reverse to remove the bridge type connecting piece 6, so that the problem battery is single and can be quickly and conveniently extracted.

[0058] Embodiments of the present application are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. Embodiments were chosen and described in order to best explain the principles of the application and its practical application, and to enable others skilled in the art to understand the application for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A lithium iron phosphate battery, comprising a battery compartment (1) and a separator assembly (3), characterized in that, The battery compartment (1) has evenly distributed insertion slots (2) inside. The partition assembly (3) is inserted into the insertion slots (2). The partition assembly (3) includes a main heating partition (301), a hollow rubber ring (302), a secondary heating partition (303), a sensor contact (304), and a 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 sensor contact (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 support plate (305), and the surface of the support plate (305) is provided with a battery body (4). The secondary heating partition (303) is provided with a support plate (304). 3) The bottom of the battery body (4) is higher than the bottom of the main heating separator (301), and the auxiliary heating separator (303) is elastically connected to the main heating separator (301) through a hollow rubber ring (302). The supporting plate (305) is vertically distributed with the main heating separator (301), and the two sides of the battery body (4) are respectively attached to the auxiliary heating separator (303) and the main heating separator (301). The separator assembly (3) also includes a lifting handle (306). The top of the main heating separator (301) and the auxiliary heating separator (303) are both fixed with lifting handles (306). The top surfaces of the battery body (4) are provided with detachable electrode assemblies (5). The detachable electrode assembly (5) includes an electrode post (501) and a connecting piece insertion groove (502). The surface of the electrode post (501) is provided with a connecting piece insertion groove (502).

2. A lithium iron phosphate battery according to claim 1, characterized in that: The detachable electrode assembly (5) also includes a right-angle support column (503), and the top surface of the battery body (4) is fixed with a right-angle support column (503) on one side of the electrode column (501).

3. A lithium iron phosphate battery according to claim 2, characterized in that: The detachable electrode assembly (5) also includes a clamping block (504), the top of the right-angle support column (503) is fixed with the clamping block (504), and the surface of the clamping block (504) is provided with a slot.

4. A lithium iron phosphate battery according to claim 3, characterized in that: The detachable electrode assembly (5) also includes a flexible insert rod (505), which is inserted through the interior of the clamping block (504).

5. A lithium iron phosphate battery according to claim 4, characterized in that: The connecting piece insertion slot (502) is inserted with a bridge-type connecting piece (6), and the top two sides of the bridge-type connecting piece (6) are provided with insertion holes (7), and the elastic insertion rod (505) passes through the insertion hole (7).

6. A method for curve matching of lithium iron phosphate batteries, applied to a lithium iron phosphate battery according to any one of claims 1-5, characterized in that: The curve matching method for lithium iron phosphate batteries includes the following steps: Step 1: Test individual cells to collect characteristic data, including charge / discharge curves, internal resistance tests, capacity tests, rate performance tests, and temperature performance tests; Step 2: Based on the test results, each individual battery cell is screened to identify unqualified batteries. Unqualified batteries include those with a capacity deviation greater than the threshold, internal resistance higher than the threshold, or self-discharge rate faster than the threshold. Step 3: After removing the defective batteries, perform curve matching on the remaining batteries, grouping batteries with similar voltage and capacity curve shapes, as follows: The similarity between curves is calculated using mathematical methods, such as Euclidean distance or cosine similarity. The key ranges of the voltage plateau were compared to ensure consistency. The key ranges were the discharge plateau and the cutoff voltage point. The groups are further refined based on capacity and internal resistance parameters, and batteries with similar capacity and internal resistance are preferentially assigned to the same group. Step 4: Assemble the individual cells (4) of the same group into the battery compartment (1).

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