CN221304933U

CN221304933U - Hard shell cell and battery pack

Info

Publication number: CN221304933U
Application number: CN202323047503.8U
Authority: CN
Inventors: 么洪玉; 海霞; 尚宏伟; 陈保国
Original assignee: Tianjin EV Energies Co Ltd
Current assignee: Tianjin EV Energies Co Ltd
Priority date: 2023-11-10
Filing date: 2023-11-10
Publication date: 2024-07-09
Anticipated expiration: 2033-11-10

Abstract

The utility model discloses a hard shell cell and a battery pack, and relates to the technical field of batteries. The hard shell battery cell comprises a conductive shell and a conductive connecting piece, wherein a first pole and a second pole with opposite electric properties are respectively and convexly arranged at the opposite ends of the conductive shell, and a connecting groove is formed in the end face of the first pole; one end of the conductive connecting piece is electrically connected with the first pole and is positioned in the connecting groove, and the other end of the conductive connecting piece is electrically connected with the conductive shell. The hard shell battery cell simplifies the structural arrangement, saves the space and reduces the cost.

Description

Hard shell cell and battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a hard shell battery cell and a battery pack.

Background

Electric vehicles are increasingly valued and favored in the market due to the advantages of energy conservation, environmental protection and no pollution, and have come to be in explosive growth in recent years. Currently, lithium ion batteries have the advantages of high working voltage, high energy density, long cycle life and the like, and have been widely applied to the fields of various modern communication devices and electronic devices, and meanwhile, along with the rapid development of electric bicycles, electric automobiles and electric tools, the performance requirements on the lithium ion batteries are also higher and higher.

The voltage of each battery core is collected, so that the condition of the battery core can be detected, and the performance of the lithium ion battery is ensured. However, the positive and negative electrode posts of the hard shell battery cell are respectively arranged at two sides of the length direction of the battery cell, and the battery information acquisition component for acquiring the voltage of the battery cell needs to be distributed in the length direction of the battery cell, so that the structure arrangement is complex, the space requirement is large, and the cost is high.

Disclosure of utility model

The utility model aims to provide a hard shell battery cell and a battery pack, which simplify structural arrangement, save space and reduce cost.

To achieve the purpose, the utility model adopts the following technical scheme:

A hard-shell cell comprising:

the conductive shell, opposite ends of the conductive shell are respectively provided with a first pole and a second pole with opposite electric properties in a protruding mode, and the end face of the first pole is provided with a connecting groove;

The conductive connecting piece, one end of the conductive connecting piece with first utmost point post electric connection and be located in the spread groove, the other end of the conductive connecting piece with conductive casing electric connection.

As a preferable mode of the hard-shell battery cell, at least one end of the connecting groove penetrates through to the side wall of the first pole.

As the preferable scheme of the hard shell battery cell, the conductive connecting piece comprises a first connecting section, a second connecting section and a transition section, wherein the first connecting section is arranged in the connecting groove and extends out of the connecting groove from the side wall of the first pole, the second connecting section is arranged on the end face of the conductive shell and is electrically connected with the conductive shell, and the transition section is connected with the first connecting section and the second connecting section.

As a preferable mode of the hard-shell battery cell, the transition section is arranged on the side wall of the first pole, and the transition section extends along the direction that the first pole protrudes out of the conductive shell.

As the preferable scheme of above-mentioned hard shell electric core, hard shell electric core still includes first end cover, first end cover knot is located conductive shell's tip, first post wears to establish and the protrusion first end cover, first end cover has seted up the connecting hole, conductive connection piece pass the connecting hole and with conductive shell electric connection.

As a preferable scheme of the hard-shell battery cell, the end face of the first pole is provided with a plurality of connecting grooves, and each connecting groove is electrically connected with one conductive connecting piece.

As the preferable scheme of the hard shell battery cell, the hard shell battery cell further comprises a second end cover, the second end cover is buckled at the end part of the conductive shell, the second pole penetrates through and protrudes out of the second end cover, and an explosion-proof valve is arranged on the second end cover.

As a preferable mode of the hard-shell battery cell, an insulating film is coated on the outer periphery of the conductive shell.

As a preferable mode of the hard-shell battery cell, the first pole is a positive pole.

A battery pack comprising the hard-shell cell.

The utility model has the beneficial effects that:

The utility model provides a hard shell cell and a battery pack. In the hard shell battery cell, the conductive shell is electrically connected with the first pole through the conductive connecting piece, so that the hard shell battery cell can be only arranged at one end of the second pole when the hard shell battery cell is subjected to wiring of the acquisition component, and the requirement of single-side voltage acquisition of the hard shell battery cell is met.

The hard shell battery cell simplifies the structural arrangement, saves the space and reduces the cost.

Drawings

Fig. 1 is a schematic structural diagram of a hard-shell cell provided by the utility model;

Fig. 2 is a top view of a hard-shell cell provided by the present utility model;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

fig. 4 is a left side view of a hard-shell cell provided by the present utility model;

fig. 5 is a right side view of a hard-shell cell provided by the present utility model.

In the figure:

1. A conductive housing; 2. a first pole; 3. a second post; 4. a conductive connection; 5. a first end cap; 6. a second end cap; 7. an explosion-proof valve;

21. A connecting groove; 41. a first connection section; 42. a second connection section; 43. a transition section; 51. and a connection hole.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, and may be, for example, either fixed or removable; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Unless expressly stated or limited otherwise, a first feature being "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

The embodiment provides a battery pack, which comprises a shell and a plurality of electric cores arranged in the shell. The battery cells of the battery pack are hard shell battery cells, and the hard shell battery cells are regular in shape and high in safety. As shown in fig. 1 and 2, the hard-shell battery cell comprises a conductive shell 1, and a first pole 2 and a second pole 3 with opposite electrical properties are respectively protruded at opposite ends of the conductive shell 1.

It will be appreciated that the hard-shell cells in the battery pack need to be integrated in series or parallel to increase the voltage and power of the battery pack to externally supply power. The structure of the battery cell can separate the positive electrode flat cable and the negative electrode flat cable of the series-parallel hard shell battery cell, the positive electrode flat cable and the negative electrode flat cable are not affected, and the safety of the battery pack is improved.

In the process of battery pack operation, the battery management system needs to detect the condition of the battery cells by collecting the voltage of each battery cell, so that the performance of the lithium ion battery is ensured. However, since the two poles of the hard-shell battery cell are respectively arranged at two sides of the length direction of the battery cell, the battery information acquisition component for acquiring the voltage of the battery cell needs to be wired in the length direction of the battery cell, which leads to complex structural arrangement, large space requirement, increased failure risk and high cost.

In order to solve the above-mentioned problems, the present embodiment provides a hard-shell battery cell, as shown in fig. 1 to 4, the hard-shell battery cell further includes a conductive connecting member 4, one end of the conductive connecting member 4 is electrically connected with the first pole 2, and the other end of the conductive connecting member 4 is electrically connected with the conductive housing 1.

In the hard shell battery cell, the conductive shell 1 is electrically connected with the first pole column 2 through the conductive connecting piece 4, so that the hard shell battery cell can be only arranged at one end of the second pole column 3 when the hard shell battery cell is subjected to wiring of the acquisition component, and the requirement of single-side voltage acquisition of the hard shell battery cell is met.

Preferably, the end face of the first pole 2 is provided with a connecting groove 21, and one end of the conductive connecting piece 4 is located in the connecting groove 21. The end face of the first pole 2 is used for abutting against the flat cable so that the hard shell battery cores can be connected in series or in parallel, so that the contact area is increased, the resistance is reduced, and local overheating is prevented. The arrangement of the connecting groove 21 can prevent the conductive connecting piece 4 from being positioned between the end face of the first pole 2 and the flat cable to influence the connectivity of the flat cable and the first pole 2, effectively prevent local overheating and improve the safety of the hard shell battery cell.

Further, at least one end of the connection groove 21 penetrates to the side wall of the first pole 2. The conductive connecting piece 4 enters the connecting groove 21 from the side wall of the first polar column 2, so that the conductive connecting piece 4 can be further prevented from passing through the end part of the first polar column 2, that is, the connection area between the flat cable and the first polar column 2 is hardly affected, and the conductive connecting piece 4 can realize the requirement of unilateral voltage collection on the premise of not reducing the safety of the hard shell battery cell.

In this embodiment, the conductive connecting piece 4 is an aluminum wire, which has excellent conductivity, extremely small contact resistance, and high thermal fatigue capability, and is used as a current-through channel, so that voltage is collected on one side, space is saved, and cost is reduced. The aluminum wire has good flexibility, can well control mismatch among various thermal expansion parameters, is easy to detect if poor welding occurs during welding, can repeatedly weld the complementary points of the poor positions, does not generate welding damage, and greatly improves maintainability and recovery rate.

Through selecting the aluminium silk of suitable diameter, the maximum current that allows through of aluminium silk can be controlled, when the electric core takes place the short circuit, and the current exceeds the maximum current that allows through of aluminium silk, the aluminium silk can blow, plays the fuse effect to protect the electric core, prevent or delay thermal runaway, reduce the risk to minimum. Wherein the maximum allowable current of the aluminum wire is 5-8A. Specifically, the maximum allowable current of the aluminum wire is 5A, 6A, 7A, 8A.

In the present embodiment, the conductive connecting member 4 is electrically connected to the first pole 2 and the conductive housing 1 by soldering. Specifically, the welding mode is ultrasonic welding. The ultrasonic welding can be performed at room temperature without any heating tool, and the method is simple and convenient to operate and low in cost.

In this embodiment, the first electrode post 2 is a positive electrode post. The wiring of the acquisition component is arranged at one end of the negative electrode of the hard shell cell.

As shown in fig. 3, the conductive connecting member 4 includes a first connecting section 41, a second connecting section 42 and a transition section 43, the first connecting section 41 is disposed in the connecting slot 21 and extends out of the connecting slot 21 from the side wall of the first pole 2, the second connecting section 42 is disposed on the end surface of the conductive housing 1 and is electrically connected with the conductive housing 1, and the transition section 43 connects the first connecting section 41 and the second connecting section 42.

The first connection section 41 is electrically connected with the first pole 2 in the connection groove 21, and the first connection end portion extends out of the connection groove 21, so that the transition section 43 is connected with the first connection section 41 conveniently, and the second connection section 42 is electrically connected with the conductive casing 1 at the end portion of the conductive casing 1 and is connected with the transition section 43, so that the first pole 2 is electrically connected with the conductive casing 1.

Further, a transition section 43 is provided on a side wall of the first pole 2, and the transition section 43 extends along a direction in which the first pole 2 protrudes from the conductive housing 1. The transition section 43 extends along the side wall of the first pole 2, so that the stability of the conductive connecting piece 4 can be improved, the conductive connecting piece 4 and other structures are prevented from interfering with each other, and the occupied space of the conductive connecting piece 4 can be reduced.

Preferably, the end face of the first pole 2 is provided with a plurality of connection grooves 21, each connection groove 21 being electrically connected to one conductive connection 4. The first pole 2 is connected with the conductive shell 1 through a plurality of conductive connecting pieces 4, so that on one hand, the resistance of a current passing channel can be reduced, the current of each conductive connecting piece 4 is reduced, heating is reduced, and on the other hand, the reliability of voltage acquisition can be ensured.

In this embodiment, two connection grooves 21 are formed in the end face of the first pole 2, and the two connection grooves 21 are formed in opposite sides of the first pole 2, so that the thickness of the conductive housing 1 is thinner and the length is longer in order to improve the applicability of the hard-shell battery cell, that is, the thickness < width < length of the conductive housing 1, and the two connection grooves 21 are formed in opposite sides of the first pole 2 in the width direction of the conductive housing 1, so as to ensure that enough space is provided for the conductive connection member 4.

It will be appreciated that the conductive housing 1 acts as a conductor and can only be used to connect battery information acquisition components and cannot be connected in high voltage contact with a flat cable. As shown in fig. 1 to 4, in order to avoid a failure caused by contact between the conductive housing 1 of the hard-shell battery cell and the flat cable, the hard-shell battery cell further includes a first end cap 5, the first end cap 5 is fastened to an end portion of the conductive housing 1, the first terminal post 2 is penetrated and protrudes out of the first end cap 5, the first end cap 5 is provided with a connection hole 51, and the conductive connection piece 4 passes through the connection hole 51 and is electrically connected with the conductive housing 1. The first end cap 5 can be used as an insulating member to effectively prevent the conductive housing 1 from contacting the flat cable, and the connection hole 51 facilitates the electrical connection between the conductive connector 4 and the conductive housing 1.

As shown in fig. 1, 2 and 5, the hard-shell cell further includes a second end cap 6, the second end cap 6 is fastened to the end of the conductive housing 1, and the second post 3 penetrates through and protrudes out of the second end cap 6. The second end cap 6 can also serve as an insulator for insulating the conductive housing 1 from the flat cable at the end of the second pole 3. Moreover, since the first end cap 5 needs to be provided with a connection hole 51 to allow the conductive connection member 4 to pass through, the explosion-proof valve 7 of the hard-case cell needs to be provided on the second end cap 6 to be ruptured when the inside of the cell is thermally out of control, thereby discharging high-temperature and high-pressure fluid to avoid explosion.

Since the case of the hard case cell is the conductive case 1, it is necessary to insulate the adjacent hard case cells when the battery pack is arranged inside. In order to simplify the battery pack structure and save space, the outer periphery of the conductive housing 1 is coated with an insulating film.

The foregoing is merely exemplary of the present utility model, and those skilled in the art should not be considered as limiting the utility model, since modifications may be made in the specific embodiments and application scope of the utility model in light of the teachings of the present utility model.

Claims

1. A hard-shell cell, comprising:

The conductive shell (1), opposite ends of the conductive shell (1) are respectively provided with a first pole (2) and a second pole (3) with opposite electrical properties in a protruding mode, and the end face of the first pole (2) is provided with a connecting groove (21);

The conductive connecting piece (4), one end of the conductive connecting piece (4) is electrically connected with the first pole (2) and is positioned in the connecting groove (21), and the other end of the conductive connecting piece (4) is electrically connected with the conductive shell (1).

2. The hard-shell cell according to claim 1, characterized in that at least one end of the connection slot (21) penetrates to the side wall of the first terminal (2).

3. The hard-shell cell according to claim 2, wherein the conductive connection member (4) comprises a first connection section (41), a second connection section (42) and a transition section (43), the first connection section (41) is disposed in the connection groove (21) and extends out of the connection groove (21) from the side wall of the first terminal post (2), the second connection section (42) is disposed on the end face of the conductive housing (1) and is electrically connected with the conductive housing (1), and the transition section (43) connects the first connection section (41) and the second connection section (42).

4. A hard-shell cell according to claim 3, characterized in that the transition section (43) is provided at a side wall of the first terminal (2), the transition section (43) extending in a direction in which the first terminal (2) protrudes out of the conductive housing (1).

5. The hard-shell cell according to claim 1, further comprising a first end cap (5), wherein the first end cap (5) is fastened to an end portion of the conductive housing (1), the first terminal (2) is threaded through and protrudes out of the first end cap (5), the first end cap (5) is provided with a connection hole (51), and the conductive connection piece (4) passes through the connection hole (51) and is electrically connected with the conductive housing (1).

6. The hard-shell cell according to claim 1, characterized in that the end face of the first terminal (2) is provided with a plurality of said connection grooves (21), each of said connection grooves (21) being electrically connected to one of said conductive connection members (4).

7. The hard-shell cell according to any one of claims 1 to 6, further comprising a second end cap (6), wherein the second end cap (6) is fastened to the end of the conductive housing (1), the second post (3) penetrates through and protrudes out of the second end cap (6), and an explosion-proof valve (7) is arranged on the second end cap (6).

8. The hard-shell cell according to any one of claims 1 to 6, characterized in that the conductive housing (1) is provided with an insulating film over its outer periphery.

9. The hard-shell cell of any one of claims 1 to 6, wherein the first terminal (2) is a positive terminal.

10. A battery pack comprising the hard-shell cell of any one of claims 1-9.