Battery cover plate structure

Abstract

The utility model relates to a battery cover plate structure, which is suitable for a shell battery and comprises a top cover, a positive pole assembly and lower plastic, the top cover abuts against the lower plastic cement. A positive pole column hole is formed in the top cover, and the positive pole column assembly is arranged in the positive pole column hole; the positive pole assembly comprises positive upper plastic, a first positive pole, a second positive pole, a fixing ring, a thermistor and a sealing ring; the fixing ring is arranged on the outer side of the positive pole column hole in the circumferential direction, and the positive pole upper plastic sleeve is arranged on the fixing ring; the sealing ring is arranged at the edge of the positive pole column hole, and the sealing ring is propped against the fixing ring and the positive pole upper plastic respectively; the first positive pole penetrates through the positive pole hole and is arranged on the sealing ring, the thermistor is arranged on the first positive pole, and the second positive pole is arranged on the thermistor. The structure has an over-current protection function, is high in safety and reliability, and can be produced and used as a general product.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery cover plate structure. BACKGROUND

[0002] With the development of science and technology, power battery as a kind of energy device is more and more concerned, has been widely used in mobile phone, electric vehicle, electric tool and other fields.

[0003] In the conventional square lithium ion battery structure, the positive and negative pole is directly connected with the pole piece inside the battery, in this structure, the explosion-proof valve is arranged at the center position of the sealing cover plate. When the battery short circuit occurs, the pressure inside the battery will increase sharply, once the internal pressure reaches the set pressure value of the explosion-proof valve, the explosion-proof valve will open and release pressure to prevent the battery from exploding due to excessive internal pressure. However, the above-mentioned battery structure has a significant disadvantage: when the battery short circuit occurs, there is no effective circuit breaking mechanism between the positive and negative poles; this means that even if the explosion-proof valve has opened and released pressure, the battery still has the risk of heat runaway due to continuous short-circuit current, resulting in fire or explosion and other serious consequences.

[0004] At present, in the prior art, a certain overcurrent protection mechanism is introduced in the battery structure to solve the above-mentioned problem, but the introduction of this overcurrent protection mechanism usually needs to be realized through a complex external circuit, which increases the complexity and manufacturing cost of the battery structure, and it is difficult to be widely applied. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides a battery cover plate structure, which aims to solve the problem that the positive and negative poles in the prior art do not have the function of breaking the circuit, the battery is easy to cause heat runaway when short circuit occurs, and further damage the battery, affect the normal use of the battery and other defects.

[0006] To achieve the above-mentioned purpose, the utility model embodiment proposes the following technical scheme: a battery cover plate structure is suitable for a shell battery, which comprises a top cover, a positive pole assembly and a lower plastic; the top cover is abutted on the lower plastic; the top cover is provided with a positive pole hole, and the positive pole assembly is arranged in the positive pole hole;

[0007] The positive pole assembly comprises a positive upper plastic, a first positive pole, a second positive pole, a fixing ring, a thermistor and a sealing ring; the fixing ring is circumferentially arranged on the outside of the positive pole hole, and the positive upper plastic is sleeved on the fixing ring; the sealing ring is arranged at the edge of the positive pole hole, and the sealing ring is respectively abutted with the fixing ring and the positive upper plastic; the first positive pole is arranged on the sealing ring through the positive pole hole, the thermistor is arranged on the first positive pole, and the second positive pole is arranged on the thermistor.

[0008] As a preferred embodiment, a connecting table is arranged between the fixing ring and the positive pole hole; the sealing ring is arranged on the connecting table, and the sealing ring is arranged in matching with the connecting table.

[0009] As a preferred embodiment, the fixing ring, the connecting table, the positive pole hole and the top cover are integrally formed.

[0010] As a preferred embodiment, the first positive pole abuts against the sealing ring and the positive pole upper plastic respectively; the thermistor abuts against the first positive pole, the positive pole upper plastic and the second positive pole respectively; the second positive pole abuts against the positive pole upper plastic.

[0011] As a preferred embodiment, a first hole penetrating through the lower plastic is arranged on the lower plastic, the first hole is arranged below the positive pole hole; a boss is arranged on the edge of the first hole in a circumferential direction, the positive pole hole is arranged outside the boss; the boss abuts against the positive pole hole, the sealing ring and the first positive pole respectively.

[0012] As a preferred embodiment, the first positive pole and the second positive pole are both protruding poles; the protruding pole is an aluminum stamping pole. The protruding structure of the positive pole can effectively save the recessed space, save raw materials and processing cost, improve production efficiency, and is suitable for large current use. Aluminum is a good conductor of heat, which is very beneficial to the heat management of the battery.

[0013] As a preferred embodiment, a negative pole hole is further arranged on the top cover, the negative pole hole and the positive pole hole are arranged at two ends of the top cover respectively; a negative pole assembly is arranged in the negative pole hole.

[0014] As a preferred embodiment, an explosion-proof valve hole is arranged on the top cover, the explosion-proof valve hole is arranged between the positive pole hole and the negative pole hole; an explosion-proof valve assembly is arranged in the explosion-proof valve hole.

[0015] As a preferred embodiment, a liquid injection hole is arranged on the top cover, the positive pole hole is arranged between the liquid injection hole and the explosion-proof valve hole; a matching sealing pin is arranged in the liquid injection hole.

[0016] As a preferred embodiment, a groove and a second hole are further arranged on the lower plastic; the second hole is arranged below the negative pole hole, and the second hole is arranged in matching with the negative pole assembly; the groove is arranged below the explosion-proof valve hole, and a plurality of hollows are arranged in the groove.

[0017] As a preferred implementation, the thermistor is a positive temperature coefficient thermistor; the sealing ring is an elastic sealing ring; and the shell battery is a square shell battery.

[0018] As a preferred implementation, the square shell battery is a lithium ion battery or a sodium ion battery.

[0019] The application has the advantages that: the thermistor is arranged in the positive pole column assembly, and the thermistor is arranged between the first positive pole column and the second positive pole column, so that a positive pole column assembly structure with an overcurrent protection function is formed, automatic protection in the case of internal short circuit or overcurrent of the battery can be realized, the safety performance of the battery structure is significantly improved, the battery can be effectively protected, and the service life of the battery is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0021] Figure 1 It is an overall structure schematic diagram of the battery cover plate structure of the embodiment of the present application.

[0022] Figure 2 It is an overall structure schematic diagram of the battery cover plate structure of the embodiment of the present application. Figure 1 It is an overall structure schematic diagram of the battery cover plate structure of the embodiment of the present application.

[0023] Figure 3 It is an overall structure schematic diagram of the battery cover plate structure of the embodiment of the present application. Figure 1 It is a cross-sectional structure schematic diagram of the battery cover plate structure of the embodiment of the present application.

[0024] The implementation, functional features and advantages of the present application will be further described with reference to the drawings. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0026] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, top, bottom, and the like), the directional indications are only used to explain the relative positional relationship, movement condition and the like between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0027] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or can be integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0028] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there can be a middle element.

[0029] In addition, if the embodiments of the present application involve "first", "second" and the like, the "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0030] Specifically, as Figures 1 to 3The utility model discloses an embodiment provides a battery cover structure suitable for the shell battery, including top 10, positive pole post assembly 20 and lower plastic 30, the top 10 is abutted on lower plastic 30, the top 10 is provided with positive pole post hole 11, and positive pole post assembly 20 is arranged in positive pole post hole 11,

[0031] The positive pole post assembly 20 includes a positive pole upper plastic 21, a first positive pole post 22, a second positive pole post 23, a fixing ring 24, a thermistor 25, and a sealing ring 26. The fixing ring 24 is circumferentially arranged on the outside of the positive pole post hole 11, and the positive pole upper plastic 21 is sleeved on the fixing ring 24. The sealing ring 26 is arranged on the edge of the positive pole post hole 11, and the sealing ring 26 abuts against the fixing ring 24 and the positive pole upper plastic 21, respectively. The first positive pole post 22 passes through the positive pole post hole 11 and is arranged on the sealing ring 26. The thermistor 25 is arranged on the first positive pole post 22, and the second positive pole post 23 is arranged on the thermistor 25.

[0032] The resistance of the thermistor changes with temperature. When the current of the battery abnormally rises, such as when a short circuit occurs, the temperature inside the battery rises due to the heat generated by the current, causing the resistance of the thermistor to increase sharply, thereby limiting the further increase of the battery current and achieving short circuit protection. This self-recovery protection mechanism means that once the short circuit condition is removed or the battery is disconnected from the load, the thermistor will cool down and return to a low resistance state, and the path of the positive pole post will also be restored, so that the battery can be used normally.

[0033] Through the structure of the present application, another layer of protection is provided in addition to the explosion-proof valve, enhancing the overall reliability and stability of the battery system, effectively preventing thermal failure of the battery caused by short circuit, reducing the risk of fire and explosion, and effectively improving the safety of the battery. Since the resistance change of the thermistor is reversible, the battery function can be automatically restored after the short circuit is removed without the need to replace parts. Moreover, through the structure of the present application, the battery structure does not need to be modified significantly, facilitating implementation and promotion.

[0034] As a preferred embodiment, a connecting table 12 is arranged between the fixing ring 24 and the positive pole post hole 11. The sealing ring 26 is arranged on the connecting table 12, and the sealing ring 26 is arranged in adaptation with the connecting table 12.

[0035] As a preferred embodiment, the fixing ring 24, the connecting table 12, the positive pole post hole 11, and the top 10 are integrally formed.

[0036] As a preferred embodiment, the first positive pole column 22 abuts against the sealing ring 26, the positive pole upper plastic 21 respectively; the thermistor 25 abuts against the first positive pole column 22, the positive pole upper plastic 21, the second positive pole column 23 respectively; the second positive pole column 23 abuts against the positive pole upper plastic 21.

[0037] As a preferred embodiment, the lower plastic 30 is provided with a first hole 31 penetrating through the lower plastic 30, the first hole 31 is arranged below the positive pole column hole 11; the edge of the first hole 31 is circumferentially provided with a boss 311, the positive pole column hole 11 is sleeved outside the boss 311; the boss 311 abuts against the positive pole column hole 11, the sealing ring 26, the first positive pole column 22 respectively.

[0038] As a preferred embodiment, the first positive pole column 22 and the second positive pole column 23 are both protruding pole columns; the protruding pole column is a pole column stamped from aluminum material. The protruding structure of the positive pole column can effectively save the recessed space, save raw materials and processing cost, improve production efficiency, and is suitable for large current use. Aluminum material is a good conductor of heat, which is very beneficial to the thermal management of the battery.

[0039] As a preferred embodiment, the top cover 10 is further provided with a negative pole column hole 13, the negative pole column hole 13 and the positive pole column hole 11 are arranged at both ends of the top cover 10 respectively; the negative pole column assembly 40 is arranged in the negative pole column hole 13.

[0040] As a preferred embodiment, the top cover 10 is provided with an explosion-proof valve hole 14, the explosion-proof valve hole 14 is arranged between the positive pole column hole 11 and the negative pole column hole 13; the explosion-proof valve assembly 50 is arranged in the explosion-proof valve hole 14.

[0041] As a preferred embodiment, the top cover 10 is provided with a liquid injection hole 15, the positive pole column hole 11 is arranged between the liquid injection hole 15 and the explosion-proof valve hole 14; a matching sealing nail (not marked in the figure) is arranged in the liquid injection hole 15.

[0042] As a preferred embodiment, the lower plastic 30 is further provided with a groove 32 and a second hole 33; the second hole 33 is arranged below the negative pole column hole 13, and the second hole 33 is arranged in matching with the negative pole column assembly 40; the groove 32 is arranged below the explosion-proof valve hole 14, and a plurality of hollow arrangements 321 are arranged in the groove 32.

[0043] As a preferred embodiment, the thermistor 25 is a positive temperature coefficient thermistor; the sealing ring 26 is an elastic sealing ring; the shell battery is a square shell battery.

[0044] As a preferred embodiment, the square shell battery is a lithium ion battery or a sodium ion battery.

[0045] The positive pole of the application has better fixing and thermal sensitivity, and can adapt to the use environment of large current. When abnormal current occurs, the resistance of the thermistor (PTC) will rise, thereby reducing the current output, effectively preventing the battery from being damaged or on fire due to overcurrent. When the load is disconnected, i.e. the abnormal state is removed, the temperature of the PTC thermistor decreases, and its resistance also decreases, the positive pole resumes the passage, and the battery can be used normally.

[0046] The application can form a positive pole assembly structure with overcurrent protection function by arranging a thermistor in the positive pole assembly and arranging the thermistor between the first positive pole and the second positive pole, so as to realize automatic protection in the case of internal short circuit or overcurrent of the battery, thereby significantly improving the safety performance of the battery structure, effectively protecting the battery, and prolonging the service life of the battery. Since the structure of the application has the overcurrent protection function, the battery will not be damaged immediately when encountering abnormal current, so it can be repeatedly used, reducing the use cost of the battery and improving the practicability and economy of the battery. Through the structure of the application, not only the overcurrent protection function is realized, but also the overall sealing and stability of the battery are ensured, the safety performance and reusability of the battery are significantly improved, the use cost is reduced, and the practicability and economy are higher. It can be produced and used as a general product.

[0047] In the embodiment of the application, the shell battery is generally a square battery. The cover plate can be an aluminum cover plate or a cover plate made of other materials.

[0048] In the application, the sealing ring can be made of one of PP, PC, PVC, PPS, PE and PET or a mixture of at least two materials.

[0049] The lower plastic can be processed by injection molding, has high precision, and has simple and reliable structure.

[0050] In the description of the specification, the description referring to the terms "an embodiment", "an example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0051] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

[0052] The above only describes the preferred embodiments of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and the contents of the drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A battery cover structure, suitable for battery casings, characterized in that, It includes a top cover, a positive electrode assembly, and a lower plastic part; the top cover abuts against the lower plastic part; the top cover is provided with a positive electrode hole, and the positive electrode assembly is disposed in the positive electrode hole; The positive electrode assembly includes a positive electrode plastic, a first positive electrode post, a second positive electrode post, a fixing ring, a thermistor, and a sealing ring. The fixing ring is circumferentially disposed outside the positive electrode post hole, and the positive electrode plastic is sleeved on the fixing ring. The sealing ring is disposed at the edge of the positive electrode post hole, and the sealing ring abuts against the fixing ring and the positive electrode plastic respectively. The first positive electrode post passes through the positive electrode post hole and is disposed on the sealing ring, the thermistor is disposed on the first positive electrode post, and the second positive electrode post is disposed on the thermistor.

2. The battery cover structure according to claim 1, characterized in that, A connecting platform is provided between the fixing ring and the positive electrode post hole; the sealing ring is disposed on the connecting platform, and the sealing ring is adapted to the connecting platform.

3. The battery cover structure according to claim 2, characterized in that, The fixing ring, the connecting platform, the positive electrode post hole, and the top cover are all integrally formed.

4. The battery cover structure according to claim 1, characterized in that, The first positive terminal abuts against the sealing ring and the plastic on the positive electrode; the thermistor abuts against the first positive terminal, the plastic on the positive electrode, and the second positive terminal; the second positive terminal abuts against the plastic on the positive electrode.

5. The battery cover structure according to claim 1, characterized in that, The lower plastic has a first hole penetrating through it, and the first hole is located below the positive electrode post hole; a boss is provided circumferentially around the edge of the first hole, and the positive electrode post hole is sleeved on the outside of the boss; the boss abuts against the positive electrode post hole, the sealing ring, and the first positive electrode post respectively.

6. The battery cover structure according to claim 1, characterized in that, Both the first positive electrode post and the second positive electrode post are raised electrode posts; the raised electrode post is an electrode post formed by stamping aluminum material.

7. The battery cover structure according to claim 5, characterized in that, The top cover is also provided with a negative terminal hole, and the negative terminal hole and the positive terminal hole are respectively provided at both ends of the top cover; a negative terminal assembly is provided in the negative terminal hole.

8. The battery cover structure according to claim 7, characterized in that, The top cover is provided with an explosion-proof valve hole, which is located between the positive terminal hole and the negative terminal hole; an explosion-proof valve assembly is provided inside the explosion-proof valve hole; The top cover is provided with a liquid injection hole, and the positive electrode post hole is located between the liquid injection hole and the explosion-proof valve hole; a matching sealing pin is provided in the liquid injection hole.

9. The battery cover structure according to claim 8, characterized in that, The lower plastic part is also provided with a groove and a second hole; the second hole is provided below the negative electrode post hole and is adapted to the negative electrode post assembly; the groove is provided below the explosion-proof valve hole and has multiple hollowed-out features.

10. The battery cover structure according to claim 1, characterized in that, The thermistor is a positive temperature coefficient thermistor; the sealing ring is an elastic sealing ring; the battery casing is a square battery casing. The square-shell battery is a lithium-ion battery or a sodium-ion battery.

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