CN217788583U - A battery cover and a single battery - Google Patents

Abstract

The utility model discloses a battery cover plate and a single battery, and relates to the technical field of power batteries. The battery cover plate includes a top cover and pins, the top cover is provided with poles; the pins include two clamping parts, the pins are fixedly connected to the top cover, and the pins are connected to the top cover. The poles are electrically connected, and the two clamping members can approach each other to clamp the tabs of the winding core. The battery cover plate and the single battery have high production efficiency, are not easy to explode, and have high safety.

Description

A battery cover and a single battery

technical field

The utility model relates to the technical field of power batteries, in particular to a battery cover plate and a single battery.

Background technique

Driven by the national new energy industry policy, lithium-ion power batteries have entered the stage of large-scale use. Square lithium-ion batteries include battery casings, battery cover plates, positive and negative electrode materials, separators, electrolytes and other components. Among them, the positive and negative electrode materials and the current collector form the positive and negative electrode sheets, the positive and negative electrode sheets, and the diaphragm form the winding core of the battery. The positive electrode sheet of the battery has a positive electrode tab, and the negative electrode sheet has a negative electrode tab. The positive and negative tabs of the battery are connected to the battery cover, the winding core is placed inside the casing, and the cover and the casing are sealed to form a battery.

However, at present, in the production process of lithium-ion batteries, it is often used to connect the tabs and pins together by ultrasonic welding, and use the poles to connect with external circuits for charging and discharging. This makes the battery production process one more welding process, reducing production efficiency. Since the tabs and pins are connected by solder joints, the contact area is small. When the battery is charged and discharged at a high rate, the high current is likely to cause severe heat at the solder joints, which is prone to explosion and poses a safety hazard.

In view of the above problems, it is necessary to develop a battery cover and a single battery to solve the problems of low production efficiency and easy explosion of lithium-ion batteries.

Utility model content

The purpose of the utility model is to provide a battery cover plate and a single battery, which have high production efficiency, are not prone to explosion, and have high safety.

For this purpose, the utility model adopts the following technical solutions:

A battery cover, comprising:

a top cover, the top cover is provided with poles;

pin, the pin includes two clamping parts, the pin is fixedly connected to the top cover, the pin is electrically connected to the pole, and the two clamping parts can be close to each other to clamp The tabs holding the core.

As an optional solution for the battery cover above, the pins also include a fixing piece, both of the clamping pieces are fixedly connected to the fixing piece, and the fixing piece is fixedly connected to the top cover, so The fixing member is electrically connected to the pole.

As an alternative to the battery cover above, the clamping part includes a connecting part and a clamping part, the connecting part is connected to the fixing part, and the connecting parts of the two clamping parts are arranged at intervals.

As an alternative to the battery cover above, the ends of the two clamping pieces away from the fixing piece are both inclined in a direction away from the other clamping piece to form an opening.

As an optional solution for the above-mentioned battery cover plate, it also includes a screw, the fixing member is provided with a connection hole, the screw passes through the connection hole and is threadedly connected with the cover plate, and the screw abuts against the Describe the pole.

As an alternative to the battery cover above, the pins are integrally formed.

As an alternative to the battery cover above, the top cover is provided with two poles, the pins are provided with two, and each of the pins is electrically connected to one of the poles.

As an optional solution for the battery cover above, an insulator is further included, and the insulator is sandwiched between the pole and the top cover.

As an alternative to the battery cover above, the top cover is provided with a liquid injection hole.

A single battery, including the battery cover plate, and a winding core, the winding core includes a tab, and the two clamping parts of the pin clamp the tab.

The beneficial effects of the utility model:

The utility model provides a battery cover plate and a single battery. The pins of the battery cover plate include two clamping parts, and the pins can clamp the tabs of the winding core through the two clamping parts to be connected with the tabs, and can complete charging through the poles electrically connected to the pins. discharge operation. Since the pins of the battery cover are fixedly connected to the tabs through the clamping force, the welding process of the tabs and the pins is eliminated, the battery assembly time is saved, and the assembly efficiency is improved. There is surface contact between them, the contact area is large, and it is not easy to generate local heat when charging and discharging with high current, which reduces the probability of battery explosion.

The battery cover plate and the single battery have high production efficiency, are not easy to explode, and have high safety.

Description of drawings

Fig. 1 is the exploded view of the battery cover provided by the utility model;

Fig. 2 is a schematic structural view of the battery cover plate and winding core provided by the utility model.

In the picture:

100, winding core; 101, tab;

1. Top cover; 2. Pin; 3. Pole; 4. Insulator; 5. Explosion-proof valve;

11. Liquid injection hole; 21. Clamping piece; 22. Fixing piece; 23. Opening;

211, connecting part; 212, clamping part; 221, connecting hole.

Detailed ways

Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific The azimuth structure and operation, therefore can not be construed as the limitation of the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance. Wherein, the terms "first position" and "second position" are two different positions.

Unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected" and "fixed" should be interpreted in a broad sense, for example, it may be a fixed connection or a detachable connection; it may be a mechanical connection, or It can be an electrical connection; it can be a direct connection, or an indirect connection through an intermediary, and it can be an internal communication between two elements or an interaction relationship between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

Unless otherwise expressly specified and limited, a first feature being "on" or "under" a second feature may include that the first feature is in direct contact with the second feature, and may also include that the first feature and the second feature are not in direct contact. Rather, through additional characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

The technical scheme of the utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

Driven by the national new energy industry policy, lithium-ion power batteries have entered the stage of large-scale use. Square lithium-ion batteries include battery casings, battery cover plates, positive and negative electrode materials, separators, electrolytes and other components. Among them, the positive and negative electrode materials and the current collector form the positive and negative electrode sheets, and the positive and negative electrode sheets and the diaphragm form the winding core 100 of the battery. The positive electrode sheet of the battery has a positive electrode tab, and the negative electrode sheet has a negative electrode tab. The lead-out positive and negative tabs 101 are connected to the battery cover, the winding core 100 is put into the casing, and the cover and the casing are sealed to form a battery.

However, currently in the production process of lithium-ion batteries, it is often used to connect the tab 101 and the pin 2 together by ultrasonic welding, and use the pole 3 to connect with an external circuit for charging and discharging. This makes the battery production process one more welding process, reducing production efficiency. Moreover, a large amount of metal particles will be produced during the welding process, and the metal particles will stick to the pin 2 or the tab 101, which not only affects the performance of the battery, but also poses a safety hazard.

Moreover, the tab 101 is only connected to the pin 2 through a solder joint, and the contact area is small, which results in an increase in the local resistance here. According to Q=I ² Rt, due to the high resistance of the solder joint, the heat generation at the solder joint is greater than that of pin 2 and other parts of the tab 101. When the battery is charged and discharged at a high rate, the solder joint is seriously heated. It is easy to overheat and cause the battery to catch fire, and in serious cases, it will explode, posing a safety hazard.

Embodiment one

To solve the above problems, this embodiment provides a battery cover. As shown in FIG. 1 , the battery cover includes a top cover 1 and pins 2 . The top cover 1 is provided with a pole 3, the pin 2 includes two clamping parts 21, the pin 2 is fixedly connected to the top cover 1, the pin 2 is electrically connected to the pole 3, and the two clamping parts 21 can be close to each other so that The tab 101 of the winding core 100 is clamped.

The pin 2 of the battery cover includes two clamping parts 21, and the pin 2 can clamp the tab 101 of the winding core 100 through the two clamping parts 21 to be connected with the tab 101, and can be connected with the pin 2 The pole 3 electrically connected to complete the charging and discharging operation. Since the pin 2 of the battery cover is fixedly connected to the tab 101 through the clamping force, the welding process of the tab 101 and the pin 2 is eliminated, the battery assembly time is saved, the assembly efficiency is improved, and the clamping The component 21 and the tab 101 are in surface contact with a large contact area, and it is not easy to locally generate heat when charging and discharging with a large current, which reduces the probability of battery explosion.

The battery cover plate and the single battery have high production efficiency, are not prone to explosion, and have high safety.

Preferably, the pin 2 further includes a fixing piece 22 , the two clamping pieces 21 are fixedly connected to the fixing piece 22 , the fixing piece 22 is fixedly connected to the top cover 1 , and the fixing piece 22 is electrically connected to the pole 3 . The two clamping parts 21 of the pin 2 can rotate relative to the fixing part 22 to form a clamping force on the tab 101. The fixing part 22 is used to fix the pin 2 to the top cover 1, so that the pin 2 and the top cover 1 Forming a whole, when the clamping member 21 clamps the tab 101 of the winding core 100, the winding core 100 is fixed with the top cover 1, and when the top cover 1 is fastened to the battery shell, the winding core 100 also enters into the battery. Inside the housing for easy operation.

Preferably, the clamping part 21 includes a connecting part 211 and a clamping part 212 , the connecting part 211 is connected to the fixing part 22 , and the connecting parts 211 of the two clamping parts 21 are arranged at intervals. The connecting part 211 is located at the end of the connecting part close to the fixing part 22. There is no need to clamp the tab 101 here. The connecting parts 211 of the two clamping parts 21 are arranged at intervals. On the one hand, it can prevent the occurrence of The interference causes the clamping part 212 of the two clamping parts 21 to fail to close normally to clamp the tab 101 or reduce the clamping force on the tab 101. On the other hand, the thickness of both ends of the tab 101 of the winding core 100 is greater than that The thickness of the middle part clamped by the pin 2, so the inclined structure between the connecting part 211 and the clamping part 212 can be used to engage the thicker parts at both ends of the tab 101, so that the tab 101 will not be clamped along the two sides. The gap between the parts 212 slides away from the pin 2, which improves the stability.

Preferably, the ends of the two clamping pieces 21 away from the fixing piece 22 are both inclined in a direction away from the other clamping piece 21 to form an opening 23 . The ends of the two clamping parts 21 are bent outward to form an opening 23, which is convenient for opening the clamping parts 212 of the two clamping parts 21 in opposite directions so that the tab 101 can enter between the two clamping parts 212 , when the clamping portion 212 is released, the two clamping portions 212 can clamp the tab 101 .

Further, the cover plate also includes a connecting piece, the fixing piece 22 is provided with a connecting hole 221 , the connecting piece passes through the connecting hole 221 and is connected to the cover plate, and the pin 2 is electrically connected to the pole 3 through the connecting piece. In order to avoid welding, the fixing part 22 is fixedly connected with the cover plate through the connecting part. At the same time, the connecting piece also has a conductive function, and can electrically connect the pin 2 and the pole 3, thereby eliminating the need for a separate structure of the conductive piece and reducing the cost.

Specifically, the connecting piece is a screw or a rivet, both of which are made of metal materials. The screw passes through the connecting hole 221 and is threadedly connected with the cover plate, and one end of the screw passing through the connecting hole 221 abuts against the pole 3 . The rivet passes through the connecting hole 221 and the top cover 1 so that the fixing member 22 is riveted with the top cover 1 , and one end of the rivet passing through the top cover 1 abuts against the pole 3 . Screws or rivets can not only fix the fixing part 22 to the top cover 1, but also electrically connect the pin 2 and the pole 3, and the structure is simple.

It can be understood that if the distance between the pole 3 and the pin 2 is too far, and the screw or rivet cannot be in direct contact with the pole 3, then a conductive member needs to be provided. At this time, the size of the conductive member needs to be as large as possible. In order to reduce the overall internal resistance and reduce the possibility of local heating.

Wherein, in order to reduce the cost, the pin 2 is integrally formed. The pin 2 is formed by bending a strip of metal, so that the resistance of each part of the pin 2 is the same, which avoids the problem of local resistance increase caused by the welding of multiple parts. Moreover, the fixing part 22 and the clamping part 21 are integrally formed, so that the clamping part 21 has good elasticity. During installation, the pin 2 is opened by applying force in opposite directions to the two clamping parts 212 at the opening 23, and when the tab 101 enters between the two clamping parts 212, the force to open the clamping parts 212 is removed. Force, the two clamping parts 212 can rely on their own elasticity to approach each other and stably clamp and fix the tab 101 .

It can be understood that the top cover 1 is provided with two poles 3 , and there are two pins 2 , and each pin 2 is electrically connected to one pole 3 respectively. The winding core 100 has two tabs 101, one positive pole tab and one negative pole tab. The two pins 2 of the top cover 1 hold one pole tab 101 of the winding core 100 respectively, so that the positive pole tab and the negative pole tab respectively It can be connected with an external circuit through two poles 3 .

It can be understood that the top cover 1 of the battery is usually made of a metal material to ensure sufficient strength, which causes the two poles 3 on the top cover 1 to be short-circuited. In order to solve this problem, the battery cover further includes an insulator 4 interposed between the pole 3 and the top cover 1 . Wherein, the insulator 4 has a groove, and the pole 3 is disposed in the groove. The sidewall of the groove can protect the pole 3 and further prevent the pole 3 from being in direct contact with the top cover 1 .

Preferably, the top cover 1 is provided with a liquid injection hole 11 . After the battery cover is fastened to the battery shell, electrolyte needs to be injected into the battery through the liquid injection hole 11, and the liquid injection hole 11 is blocked to prevent the electrolyte from overflowing.

Preferably, the top cover 1 is provided with an explosion-proof valve 5, and when the air pressure in the battery casing rises due to thermal runaway, the explosion-proof valve 5 can rupture and release pressure to prevent the single battery from exploding. In order to reduce costs and improve efficiency, a groove or a boss can be directly machined on the top cover 1 by machining to form the explosion-proof valve 5 .

This embodiment also provides a single battery. As shown in FIG. 2 , the single battery includes a battery cover and a winding core 100 , the winding core 100 includes a tab 101 , and the two clamping parts 21 of the pin 2 clamp the tab 101 . The single battery also includes a casing. The thickness of the two ends of the tabs 101 of the winding core 100 is greater than the thickness in the middle, so the tabs 101 can be engaged by the two clamping parts 21. When the two tabs 101 of the winding core 100 are both After the pins 2 are clamped, the winding core 100 is integrated with the battery cover, and when the battery cover is fastened to the casing, the winding core 100 enters the casing of the single battery.

Preferably, the two tabs 101 of the winding core 100 protrude from opposite sides respectively, and the two pins 2 of the battery cover respectively clamp the tabs 101 of the winding core 100 from both ends of the winding core 100, thereby greatly The size of the battery cell is reduced and the energy density is improved.

Embodiment two

This embodiment provides a battery cover, the opposite side of the two clamping parts 21 of each pin 2 of the battery cover forms a first abutment surface, the tab 101 of the winding core 100 is flat, the pole The two sides of the ear 101 form a second abutment surface. When the two clamping members 21 clamp the corresponding tab 101, the first abutment surface and the second abutment surface abut and are in surface contact, thereby greatly reducing the The internal resistance of the battery can also effectively avoid local heating of the contact portion between the clamping member 21 and the tab 101 , greatly improving the performance and safety of the battery.

The above content is only a preferred embodiment of the present utility model. For those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation and scope of application. The content of this specification should not be understood as Limitations on the Invention.

Claims (10)

1. A battery cover plate, comprising:

the terminal post comprises a top cover (1), wherein the top cover (1) is provided with a terminal post (3);

pin (2), pin (2) include two clamping part (21), pin (2) with top cap (1) fixed connection, pin (2) with utmost point post (3) electricity is connected, two clamping part (21) can be close to utmost point ear (101) with centre gripping core (100) each other.

2. The battery cover plate according to claim 1, wherein the pin (2) further comprises a fixing member (22), the two clamping members (21) are fixedly connected with the fixing member (22), the fixing member (22) is fixedly connected with the top cover (1), and the fixing member (22) is electrically connected with the pole (3).

3. The battery cover plate according to claim 2, wherein the clamping members (21) comprise a connecting portion (211) and a clamping portion (212), the connecting portion (211) is connected to the fixing member (22), and the connecting portions (211) of the two clamping members (21) are spaced apart.

4. The battery cover plate according to claim 2, characterized in that the ends of the two clamping members (21) remote from the fixing member (22) are each inclined in a direction away from the other clamping member (21) to form an opening (23).

5. The battery cover plate according to claim 2, further comprising a connecting member, wherein the fixing member (22) defines a connecting hole (221), the connecting member passes through the connecting hole (221) and is connected to the cover plate, and the pin (2) is electrically connected to the post (3) through the connecting member.

6. The battery cover plate according to claim 2, characterized in that the pins (2) are integrally formed.

7. The battery cover plate according to claim 1, wherein the top cover (1) is provided with two of the poles (3), and the pins (2) are provided with two, each of the pins (2) being electrically connected with one of the poles (3).

8. The battery cover plate according to any one of claims 1 to 7, further comprising an insulating member (4), the insulating member (4) being sandwiched between the post (3) and the top cover (1).

9. The battery cover plate according to any one of claims 1 to 7, wherein the top cover (1) is provided with a liquid injection hole (11).

10. A single battery, comprising the battery cover plate according to any one of claims 1 to 9, and further comprising a winding core (100), wherein the winding core (100) comprises a tab (101), and the two clamping members (21) of the pin (2) clamp the tab (101).

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