Battery cover plate of square battery and square battery

Abstract

The utility model relates to a battery cover plate of a square battery and the square battery, the battery cover plate comprises a cover plate body, the cover plate body is provided with at least two via holes, positive pole assemblies / negative pole assemblies are respectively fixed on two sides of the via holes, and a buckle is arranged at the bottom of the cover plate body; the insulation pad is clamped with the cover plate body through the buckle; and the temperature probe is clamped in the via hole, and the tail end of the temperature probe extends to the edge of the insulating pad. According to the battery cover plate of the square battery and the square battery provided by the embodiment of the utility model, the through hole is formed in the cover plate body at the top of the battery, and the temperature probe is inserted to the attached insulating pad, so that thermoelectric force generated by adopting different materials between the positive electrode and the negative electrode is obtained; and the voltage signal is used as a temperature change detection signal to be transmitted outwards.

Description

Technical Field

[0001] The utility model relates to the technical field of battery preparation, in particular to a battery cover plate of a square battery and a square battery. Background Art

[0002] During use, the battery needs to be constantly tested to see if its operating temperature is within the normal range, which is very important for the battery and the device using the battery. The usual method for testing the battery temperature is to set a temperature sensor on the surface of the aluminum shell of the battery to collect the temperature.

[0003] However, this temperature collection method has certain shortcomings. First, the temperature sensor collects the temperature of the battery surface, which is different from the actual temperature inside the battery, resulting in the battery management system being unable to make accurate control based on the temperature; in addition, during the use of the battery, it is relatively difficult to collect the internal temperature of the battery, so a battery structure that is conducive to simple and accurate detection of battery temperature changes is needed. Utility Model Content

[0004] The utility model provides a battery cover plate of a square battery and a square battery, which can realize simple and accurate detection of temperature changes inside the battery.

[0005] In a first aspect, an embodiment of the utility model provides a battery cover for a square battery, comprising:

[0006] The cover body is provided with at least two through holes, and the positive electrode assembly / negative electrode assembly is fixed on both sides of the through holes respectively, and a buckle is provided at the bottom of the cover body;

[0007] The insulating pad is clamped with the cover body through a buckle;

[0008] The temperature probe is clipped into the via hole, and the end extends to the edge of the insulating pad.

[0009] Optionally, a first sealing ring is provided between the temperature probe and the cover body.

[0010] Optionally, the positive electrode assembly includes a positive electrode column, a positive electrode encapsulation, and a positive electrode protrusion;

[0011] The positive electrode protrusion is fixed to the top of the cover body, and the positive electrode rubber coating covers the positive electrode protrusion, with a second sealing ring added in between;

[0012] The positive electrode column is fixed on the top surface of the positive electrode rubber package.

[0013] Optionally, the top surface of the positive electrode column is covered with a first plastic.

[0014] Optionally, the negative electrode assembly includes a negative electrode column, a negative electrode encapsulation, and a negative electrode protrusion;

[0015] The negative electrode protrusion is fixed to the top of the cover body, and the negative electrode rubber is covered on the negative electrode protrusion, with a third sealing ring added in between;

[0016] The negative electrode column is fixed on the top surface of the negative electrode rubber package.

[0017] Optionally, the top surface of the negative electrode column is covered with a second plastic.

[0018] Optionally, the via hole includes an explosion-proof valve hole;

[0019] The cover plate body is provided with an explosion-proof membrane at the bottom of the explosion-proof valve hole.

[0020] Optionally, a temperature probe top is added with an injection molded part.

[0021] In a second aspect, an embodiment of the utility model provides a square battery, including the battery cover provided in the first aspect.

[0022] The utility model provides a battery cover plate and a square battery for a square battery. A through hole is opened on the cover plate body at the top of the battery, and a temperature probe is inserted into the insulating pad to fit the battery. The thermoelectric potential generated between the positive electrode and the negative electrode due to the different materials used is obtained, and this voltage signal is transmitted externally as a detection signal of temperature change. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A side view of a battery cover of a square battery provided in an embodiment of the utility model;

[0024] Figure 2 A top view of a battery cover of a square battery provided in an embodiment of the utility model;

[0025] Figure 3 It is an exploded view of a battery cover of a square battery provided in an embodiment of the utility model.

[0026] In the figure: 1. Cover body; 2. Through hole; 3. Positive electrode assembly; 4. Negative electrode assembly; 5. Buckle; 6. Insulation pad; 7. Temperature probe; 8. First sealing ring; 9. Positive electrode column; 10. Positive electrode rubber coating; 11. Positive electrode protrusion; 12. Second sealing ring; 13. First plastic; 14. Negative electrode column; 15. Negative electrode rubber coating; 16. Negative electrode protrusion; 17. Third sealing ring; 18. Second plastic; 19. Explosion-proof valve hole; 20. Explosion-proof membrane; 21. Injection molded part; 22. Surface sticker. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0028] At present, for batteries, such as square batteries, temperature collection during use often uses temperature sensors to collect the temperature of the battery surface, but this cannot actually reflect the actual temperature inside the battery, and in some usage scenarios, this method of collecting temperature is also difficult to implement, which makes it impossible to accurately judge the internal temperature of the battery and make effective control and protection measures.

[0029] Embodiment 1

[0030] In view of the above shortcomings, the utility model proposes a battery cover for a square battery, such as Figure 1 , Figure 2 and Figure 3 As shown, including:

[0031] The cover body 1 is provided with at least two through holes 2, and a positive electrode assembly 3 / a negative electrode assembly 4 is fixed on both sides of the through holes 2, and a buckle 5 is provided at the bottom of the cover body 1; the cover body 1 and the shell around the square battery are made of aluminum, with the grade of 3003-H14; it has good corrosion resistance to avoid leakage during liquid injection.

[0032] The insulating pad 6 is clamped with the cover body 1 through the buckle 5; the insulating pad 6 is made of PVC (polyvinyl chloride) material, and its function is to prevent the cover from contacting the battery coil core below and causing a short circuit.

[0033] The temperature probe 7 is clamped to the via hole 2, and the end thereof extends to the edge of the insulating pad 6. The temperature sensor may be a thermocouple, and its working principle is to collect the thermoelectric potential between the positive electrode and the negative electrode during the operation of the battery. The thermoelectric potential is generated due to the difference in thermoelectric properties between the different metals used in the positive and negative electrodes. The thermoelectric property can generate a weak voltage signal between the metals that is proportional to the temperature change. The thermocouple determines the temperature change through the voltage signal.

[0034] Since the temperature probe 7 is inserted into the cover body 1 through the through hole 2, in order to prevent the gap from affecting the aforementioned thermoelectric potential, a first sealing ring 8 needs to be provided between the temperature probe 7 and the cover body 1. The first sealing ring 8 can be made of fluororubber, and an injection molded part 21, such as an insulating cap, is added to the top of the temperature probe 7 to protect the temperature probe 7 when not in use.

[0035] The positive electrode assembly 3 includes a positive electrode column 9, a positive electrode rubber coating 10 and a positive electrode protrusion 11; the positive electrode protrusion 11 is fixed to the top of the cover body 1, the positive electrode rubber coating 10 covers the positive electrode protrusion 11, and a second sealing ring 12 is added between them; the positive electrode column 9 is fixed to the top surface of the positive electrode rubber coating 10. The positive electrode protrusion 11 is connected to the positive electrode ear of the battery coil core below the insulating pad 6 through the cover.

[0036] The positive electrode coating 10 is made of conductive PPS (polyphenylene sulfide), the positive electrode column 9 is made of aluminum material, such as grade 1060-H14; the second sealing ring 12 is made of fluororubber; in addition, the top surface of the positive electrode column 9 is covered with a first plastic 13. The first plastic 13 is made of conductive PEI (polyethyleneimine), and by selecting the positive electrode coating 10 and the first plastic 13 as conductive materials, the power in the battery core can be transmitted to the external device through the positive electrode column 9.

[0037] Similarly, the negative electrode assembly 4 includes a negative electrode column 14, a negative electrode rubber coating 15 and a negative electrode protrusion 16; the negative electrode column 14 can be made of copper, the negative electrode rubber coating 15 adopts insulating PPS (polyphenylene sulfide), the negative electrode protrusion 16 is fixed to the top of the cover body 1, the positive electrode protrusion 11 and the negative electrode protrusion 16 can adopt a riveted structure integrally formed with the cover body 1, and at the same time, the insulating pad is provided with a positioning column corresponding to the positive electrode protrusion 11 and the negative electrode protrusion 16, the negative electrode rubber coating 15 covers the negative electrode protrusion 16, and a third sealing ring 17 is added between them; the negative electrode column 14 is fixed to the top surface of the negative electrode rubber coating 15. The third sealing ring 17 adopts fluororubber; the top surface of the negative electrode column 14 is covered with a second plastic 18. The third plastic adopts insulating PEI (polyethyleneimine).

[0038] It should be added here that the positive electrode encapsulation 10 and the first plastic 13 are made of conductive material because the positive electrode needs to be connected to the cover body 1 and be charged, while the negative electrode encapsulation 15 and the second plastic 18 cannot be connected to the cover body 18, and the positive electrode structure and the negative electrode structure cannot be interchanged.

[0039] The above-mentioned via 2 includes an explosion-proof valve hole 19; the cover body 1 is provided with an explosion-proof membrane 20 at the bottom of the explosion-proof valve hole 19. The explosion-proof membrane 20 is made of aluminum, with a brand of MFX2; and a surface sticker 22 is pasted on the upper surface of the cover body 1 at a position corresponding to the explosion-proof membrane 20. The surface sticker 22 is made of PET (polyethylene terephthalate) and its function is to prevent the explosion-proof membrane 20 from being damaged. At the same time, a liquid injection hole is provided on the surface of the cover body 1, which is used to inject electrolyte into the battery coil through the insulating pad 6 through the liquid injection hole.

[0040] The utility model provides a battery cover for a square battery. A through hole is opened on the cover body at the top of the battery, and a temperature probe is inserted into the insulating pad to obtain the thermoelectric potential generated between the positive electrode and the negative electrode due to the different materials used. This voltage signal is then transmitted externally as a detection signal of the temperature change.

[0041] Embodiment 2

[0042] Based on the first embodiment, the present utility model further proposes a square battery, including the battery cover provided in the first embodiment;

[0043] In addition, it also includes a battery shell and a battery core, wherein the battery core is arranged inside the battery shell and filled with electrolyte; the battery shell and the battery cover are connected by top welding, and the side of the battery shell is connected by side welding.

[0044] The square battery proposed in the embodiment of the utility model adopts the same battery cover as the aforementioned embodiment, has the same structure, and achieves the same technical effect, which will not be described in detail here.

[0045] Some directional words are defined in the present utility model. Unless otherwise specified, the directional words used, such as "up", "down", "left", "right", "inside" and "outside", are used for ease of understanding and therefore do not constitute limitations on the protection scope of the present utility model.

[0046] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A battery cover for a square battery, characterized in that: include: The cover plate body (1) is provided with at least two through holes (2), and a positive electrode assembly (3) / a negative electrode assembly (4) is respectively fixed on both sides of the through holes (2), and a buckle (5) is provided at the bottom of the cover plate body (1); An insulating pad (6) is snap-connected to the cover plate body (1) via the snap buckle (5); A temperature probe (7) is clamped in the through hole (2), and the end of the probe extends to the edge of the insulating pad (6).

2. The battery cover of the square battery according to claim 1, characterized in that: A first sealing ring (8) is provided between the temperature probe (7) and the cover plate body (1).

3. The battery cover of the square battery according to claim 1, characterized in that: The positive electrode assembly (3) comprises a positive electrode column (9), a positive electrode encapsulation (10) and a positive electrode protrusion (11); The positive electrode protrusion (11) is fixed to the top of the cover plate body (1), and the positive electrode rubber coating (10) covers the positive electrode protrusion (11), with a second sealing ring (12) added therebetween; The positive electrode column (9) is fixed to the top surface of the positive electrode encapsulation (10).

4. The battery cover of the square battery according to claim 3, characterized in that: The top surface of the positive electrode column (9) is covered with a first plastic (13).

5. The battery cover of the square battery according to claim 1, characterized in that: The negative electrode assembly (4) comprises a negative electrode column (14), a negative electrode rubber coating (15) and a negative electrode protrusion (16); The negative electrode protrusion (16) is fixed to the top of the cover plate body (1), and the negative electrode rubber coating (15) covers the negative electrode protrusion (16), with a third sealing ring (17) added therebetween; The negative electrode column (14) is fixed to the top surface of the negative electrode encapsulation (15).

6. The battery cover of the square battery according to claim 5, characterized in that: The top surface of the negative electrode column (14) is covered with a second plastic (18).

7. The battery cover of the square battery according to claim 1, characterized in that: The through hole (2) includes an explosion-proof valve hole (19); The cover plate body (1) is provided with an explosion-proof membrane (20) at the bottom of the explosion-proof valve hole (19).

8. The battery cover of the square battery according to claim 1, characterized in that: An injection molded part (21) is added to the top of the temperature probe (7).

9. A square battery, characterized in that: A battery cover comprising any one of claims 1-8.

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