CN215070285U

CN215070285U - Square lithium battery

Info

Publication number: CN215070285U
Application number: CN202120513520.8U
Authority: CN
Inventors: 廖成权; 阳康; 胡志明; 杨国龙
Original assignee: Shenzhen Xiongtao Lithium Electricity Co ltd
Current assignee: Shenzhen Xiongtao Lithium Electricity Co ltd
Priority date: 2021-03-10
Filing date: 2021-03-10
Publication date: 2021-12-07
Anticipated expiration: 2031-03-10

Abstract

The utility model provides a square lithium battery, which comprises a shell component and a battery cell arranged in the shell component; the device is characterized in that the shell component comprises a first shell, a second shell, a positive cover plate, a negative cover plate and a barrier strip; one end of the first shell is clamped at the top of the positive electrode cover plate, and the other end of the first shell is clamped at the top of the negative electrode cover plate; one end of the second shell is clamped at the bottom of the anode cover plate, and the other end of the second shell is clamped at the bottom of the cathode cover plate; the first housing and the second housing are abutted; the positive electrode cover plate is connected with a positive electrode lug of the battery cell; the negative electrode cover plate is connected with a negative electrode tab of the battery cell; the positive cover plate and the negative cover plate are identical in structure; one end of the barrier strip is connected with the positive electrode cover plate, and the other end of the barrier strip is connected with the negative electrode cover plate. The problem of lithium battery case's longitudinal length overlength, assembly difficulty can be solved to this application, is favorable to electric core to go into the shell and pour into electrolyte solution into.

Description

Square lithium battery

Technical Field

The utility model relates to a lithium cell technical field especially relates to a square lithium cell.

Background

Lithium batteries are a type of battery using a nonaqueous electrolyte solution with lithium metal or a lithium alloy as a negative electrode material. The lithium battery has the characteristics of light weight, large energy storage, no pollution, long service life and the like, so the lithium battery is widely applied to various industries.

At present, the shell of a square lithium battery on the market is generally composed of a cover plate and an aluminum shell, and the design enables a positive pole column and a negative pole column of the lithium battery to be arranged on the same side, so that the temperature rise of a tab of the lithium battery in the operation process is increased, the heat dissipation effect is poor, the use performance of the lithium battery is influenced, and particularly the influence on the high-rate battery is larger. In order to avoid the influence of heat generation on the service performance of the lithium battery, the shell of the lithium battery is generally designed to be flat, and the positive pole column and the negative pole column are designed at two ends of the shell of the lithium battery so as to improve the heat dissipation effect and ensure the service performance of the lithium battery.

However, the longitudinal length of the flat lithium battery shell is too long, which increases the difficulty in the lithium battery assembling process and is not beneficial to the insertion of the battery core into the shell and the injection of the electrolyte solution.

SUMMERY OF THE UTILITY MODEL

Based on this, the embodiment of the utility model provides a square lithium cell aims at solving the longitudinal length overlength that is the lithium battery case of platykurtic, has increaseed the degree of difficulty in the lithium cell assembling process, is unfavorable for electric core to go into the shell and pours into the problem of electrolyte solution into.

In order to achieve the above object, the utility model provides a following technical scheme:

a square lithium battery comprises a shell component and a battery core arranged in the shell component; the shell component comprises a first shell, a second shell, a positive cover plate, a negative cover plate and a barrier strip; one end of the first shell is clamped at the top of the positive electrode cover plate, and the other end of the first shell is clamped at the top of the negative electrode cover plate; one end of the second shell is clamped at the bottom of the anode cover plate, and the other end of the second shell is clamped at the bottom of the cathode cover plate; the first housing and the second housing are abutted; the positive electrode cover plate is connected with a positive electrode lug of the battery cell; the negative electrode cover plate is connected with a negative electrode tab of the battery cell; the positive cover plate and the negative cover plate are identical in structure; one end of the barrier strip is connected with the positive electrode cover plate, and the other end of the barrier strip is connected with the negative electrode cover plate.

Furthermore, a plurality of first abdicating notches are formed in the side surface of the first shell; the first abdicating notch is semicircular.

Furthermore, a plurality of second abdicating notches matched with the first abdicating notches are arranged on the side surface of the second shell; the second abdicating notch is semicircular.

Furthermore, when the first shell with the second shell looks butt, first notch of stepping down with the second notch looks butt of stepping down forms circular breach.

Furthermore, the barrier strips comprise perforated barrier strips and non-perforated barrier strips which are oppositely arranged on two sides of the battery cell; one end of the porous barrier strip is connected with the positive electrode cover plate, and the other end of the porous barrier strip is connected with the negative electrode cover plate; one end of the nonporous barrier strip is connected with the positive electrode cover plate, and the other end of the nonporous barrier strip is connected with the negative electrode cover plate.

Furthermore, a plurality of liquid injection holes are formed in the perforated barrier strip; the liquid injection hole and the circular notch are concentrically arranged.

Furthermore, one end of the positive pole cover plate is provided with a first mounting groove, and the other end of the positive pole cover plate is provided with a second mounting groove; a first connecting plate is arranged in the first mounting groove; a second connecting plate is arranged in the second mounting groove; the first connecting plate is connected with the perforated barrier strip; the second connecting plate is connected with the non-porous barrier strip.

Furthermore, one end of the negative cover plate is provided with a third mounting groove, and the other end of the negative cover plate is provided with a fourth mounting groove; a third connecting plate is arranged in the third mounting groove; a fourth connecting plate is arranged in the fourth mounting groove; the third connecting plate is connected with the porous barrier strip; the fourth connecting plate is connected with the non-porous barrier strip.

Further, the first mounting groove and the third mounting groove are arranged on the same side; the second mounting groove and the fourth mounting groove are arranged on the same side.

Furthermore, the positive cover plate is also provided with a positive flexible connection; the positive electrode flexible connection is connected with a positive electrode tab of the battery cell; the negative electrode cover plate is also provided with a negative electrode flexible connection; the negative electrode flexible connection is connected with a negative electrode tab of the battery cell so as to ensure the normal use of the lithium battery.

Further, the housing assembly further comprises a plurality of sealing nails for sealing; one end of the sealing nail is abutted to the perforated barrier strip, and the other end of the sealing nail is matched with the round notch.

The utility model provides a square lithium cell packs electric core through setting up first shell and second shell, has simplified the process that electric core goes into the shell, has reduced electric core and has gone into shell in-process damage. By providing the perforated barrier and the non-perforated barrier, the cell is effectively protected from being punctured when the first casing and the second casing are welded. Through will annotating the liquid hole setting on porose blend stop for the lithium cell need be put to the side when annotating liquid, guarantees to annotate the liquid hole and remains all the time in the top of electric core, has avoided electrolyte not to annotate the condition that just overflows fully. Through the cooperation of sealed nail and notes liquid hole for can keep sealed after the lithium cell is annotated liquid, improve the problem of lithium cell weeping in transportation and use effectively.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic perspective view of a square lithium battery according to an embodiment of the present invention;

FIG. 2 is an exploded view of FIG. 1;

fig. 3 is a partial sectional view of the positive electrode cap plate of fig. 2;

fig. 4 is a partial cross-sectional view of the negative electrode cap plate of fig. 2;

FIG. 5 is a cross-sectional view of FIG. 1;

FIG. 6 is an enlarged view A of FIG. 5;

fig. 7 is an enlarged view B of fig. 5.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front, back, top and bottom … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

At present, the shell of a square lithium battery on the market is generally composed of a cover plate and an aluminum shell, and the design enables a positive pole column and a negative pole column of the lithium battery to be arranged on the same side, so that the temperature rise of a tab of the lithium battery in the operation process is increased, the heat dissipation effect is poor, the use performance of the lithium battery is influenced, and particularly the influence on the high-rate battery is larger. In order to avoid the influence of heat generation on the service performance of the lithium battery, the shell of the lithium battery is generally designed to be flat, and the positive pole column and the negative pole column are designed at two ends of the shell of the lithium battery so as to improve the heat dissipation effect and ensure the service performance of the lithium battery. And the longitudinal length of the flat lithium battery shell in the market is too long, so that the difficulty in the lithium battery assembling process is increased, and the battery core is not favorable for entering the shell and injecting electrolyte solution. In order to solve the technical problem, the utility model provides a square lithium cell.

As shown in fig. 1 and fig. 2, a square lithium battery provided in an embodiment of the present invention includes a housing assembly 1 and a battery cell 2 disposed in the housing assembly 1; the housing assembly 1 comprises a first housing 11, a second housing 12, a positive cover plate 13, a negative cover plate 14 and a barrier strip 15; one end of the first shell 11 is clamped on the top of the positive electrode cover plate 13, and the other end is clamped on the top of the negative electrode cover plate 14; one end of the second housing 12 is clamped at the bottom of the positive electrode cover plate 13, and the other end is clamped at the bottom of the negative electrode cover plate 14; the first shell 11 and the second shell 12 are abutted; the positive electrode cover plate 13 is connected with a positive electrode tab 21 of the battery cell 2; the negative cover plate 14 is connected with a negative tab 22 of the battery cell 2; the positive electrode cover plate 13 and the negative electrode cover plate 14 have the same structure; one end of the barrier strip 15 is connected with the positive electrode cover plate 13, and the other end is connected with the negative electrode cover plate 14.

Referring to fig. 2, in this embodiment, a plurality of first yielding notches 111 are disposed on a side surface of the first housing 11; the first abdicating notch 111 is semicircular.

Further, a plurality of second abdicating notches 121 adapted to the first abdicating notches 111 are disposed on the side surface of the second housing 12; the second abdicating notch 121 is semicircular.

Further, when the first housing 11 abuts against the second housing 12, the first abdicating notch 111 abuts against the second abdicating notch 121 to form a circular notch (not shown).

Further, the barrier strip 15 includes a perforated barrier strip 151 and a non-perforated barrier strip 152 which are oppositely disposed on two sides of the battery core 2; one end of the perforated barrier strip 151 is connected with the positive electrode cover plate 13, and the other end is connected with the negative electrode cover plate 14; one end of the non-porous barrier strip 152 is connected to the positive electrode cover plate 13, and the other end is connected to the negative electrode cover 14. In this way, the perforated barrier 151 and the non-perforated barrier 152 can effectively protect the battery cell 2 when the first casing 11 and the second casing 12 are welded, so that the battery cell 2 is not broken down by the welding of the first casing 11 and the second casing 12.

Furthermore, a plurality of liquid injection holes 1511 are arranged on the perforated barrier 151; the liquid injection hole 1511 is concentrically arranged with the circular notch. In this embodiment, three injection holes 1511 are uniformly formed on the side of the perforated barrier 151, wherein the middle injection hole 1511 is used for exhausting air and the injection holes on both sides are used for injecting electrolyte solution, so that the efficiency of injecting electrolyte solution can be improved.

Referring to fig. 3, in this embodiment, one end of the positive electrode cover plate 13 is provided with a first mounting groove (not shown in the figure), and the other end is provided with a second mounting groove (not shown in the figure); a first connecting plate 131 is arranged in the first mounting groove; a second connecting plate 132 is arranged in the second mounting groove; the first connecting plate 131 is connected with the perforated barrier 151; the second connector plate 132 is connected to the non-porous barrier 152. In this embodiment, the first connecting plate 131 and the perforated barrier 151 are connected by welding, and the second connecting plate 132 and the non-perforated barrier 152 are connected by welding.

Referring to fig. 4, in this embodiment, one end of the negative electrode cover plate 14 is provided with a third mounting groove (not shown in the drawings), and the other end is provided with a fourth mounting groove (not shown in the drawings); a third connecting plate 141 is arranged in the third mounting groove; a fourth connecting 142 plate is arranged in the fourth mounting groove; the third connecting plate 141 is connected with the perforated barrier 151; the fourth connector plate is connected 142 to the non-porous barrier 152. In this embodiment, the third connecting plate 141 and the perforated barrier 151 are connected by welding, and the fourth connecting plate 142 and the non-perforated barrier 152 are connected by welding.

Referring to fig. 3 and 4 again, in this embodiment, a positive electrode soft connection 133 is further disposed on the positive electrode cover plate 13; the positive electrode soft connection 133 is connected with a positive electrode tab 21 of the battery cell 2; the negative electrode cover plate 14 is also provided with a negative electrode soft connection 143; the negative electrode flexible connection 143 is connected with the negative electrode tab 22 of the battery cell 2 to ensure normal use of the lithium battery. In this embodiment, the connection mode between the positive electrode soft connection 133 and the positive electrode tab 21 and the connection mode between the negative electrode soft connection 143 and the negative electrode tab 22 are both welding.

Referring again to fig. 2, in the present embodiment, the housing assembly 1 further comprises a plurality of sealing nails 16 for sealing; one end of the sealing nail 16 is abutted against the perforated barrier strip 151, and the other end is matched with the circular notch. In this embodiment, after the electrolyte injection is completed, the sealing nail 16 needs to be welded on the circular notch, so as to ensure the sealing performance of the circular notch.

In this embodiment, the first housing 11, the second housing 12, the perforated barrier 151, the non-perforated barrier 152, the first connecting plate 131, the second connecting plate 132, the third connecting plate 141, the fourth connecting plate 142 and the seal nail 16 are all made of aluminum or steel.

Referring to fig. 2, fig. 5, fig. 6 and fig. 7, a square lithium battery according to this embodiment is produced by the following steps:

firstly, welding a positive electrode tab 21 of the battery cell 2 on a positive electrode flexible connection 133 of the positive electrode cover plate 13, and welding a negative electrode tab 22 of the battery cell 2 on a positive electrode flexible connection 143 of the negative electrode cover plate 14; then welding the two ends of the perforated barrier 151 to the first connecting plate 131 and the third connecting plate 141, respectively, and welding the two ends of the non-perforated barrier 152 to the second connecting plate 132 and the fourth connecting plate 142, respectively; then, two ends of the first housing 11 are respectively matched with the positive electrode cover plate 13 and the negative electrode cover plate 14, two ends of the second housing 12 are respectively matched with the positive electrode cover plate 13 and the negative electrode cover plate 14, and in the assembling process, it is required to ensure that the first abdicating notch 111 on the first housing 11 is concentric with the liquid injection hole 1511 on the porous barrier strip 151, and the second abdicating notch 121 on the second housing 12 is concentric with the liquid injection hole 1511 on the porous barrier strip 151; after the lithium battery is assembled, the butting position of the first shell 11 and the second shell 12, the matching position of two ends of the first shell 11 and a positive electrode cover plate 13 and a negative electrode cover plate 14 respectively, and the matching position of two ends of the second shell 12 and the positive electrode cover plate 13 and the negative electrode cover plate 14 respectively are welded by laser, so that the sealing property of the lithium battery is ensured; in the laser welding process, the first abdicating notch 111 and the second abdicating notch need to be abdicated; finally, the lithium battery is placed on the side, electrolyte solution is injected, during injection, injection can be performed from the injection holes 1511 on the two sides of the porous barrier strip 151, and the injection hole 1511 in the middle is mainly used for exhausting air so as to improve the injection efficiency; after the liquid injection is completed, the liquid injection hole 1511 is sealed by using the sealing nail 16, and the sealing nail 16 is welded on the first abdicating notch 111 and the second abdicating notch 121, so that the electrolyte solution is ensured not to leak.

The utility model provides a square lithium cell packs electric core 2 through setting up first shell 11 and second shell 12, has simplified the process that electric core 2 goes into the shell, has reduced electric core 2 and has gone into the damage of shell in-process. By providing the perforated barrier 151 and the non-perforated barrier 152, the cell 2 is effectively protected from breakdown when the first casing 11 and the second casing 12 are welded. Through annotating liquid hole 1511 setting on porose blend strip 151 for the lithium cell need the side to put when annotating liquid, guarantees to annotate liquid hole 1511 and remains throughout in the top of electric core 2, has avoided electrolyte not to annotate the condition that just overflows fully. Through the cooperation of the sealing nail 16 and the liquid injection hole 1511, the lithium battery can be kept sealed after being injected with liquid, and the problem of leakage of the lithium battery in transportation and use is effectively solved.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. A square lithium battery comprises a shell component and a battery core arranged in the shell component; the device is characterized in that the shell component comprises a first shell, a second shell, a positive cover plate, a negative cover plate and a barrier strip; one end of the first shell is clamped at the top of the positive electrode cover plate, and the other end of the first shell is clamped at the top of the negative electrode cover plate; one end of the second shell is clamped at the bottom of the anode cover plate, and the other end of the second shell is clamped at the bottom of the cathode cover plate; the first housing and the second housing are abutted; the positive electrode cover plate is connected with a positive electrode lug of the battery cell; the negative electrode cover plate is connected with a negative electrode tab of the battery cell; the positive cover plate and the negative cover plate are identical in structure; one end of the barrier strip is connected with the positive electrode cover plate, and the other end of the barrier strip is connected with the negative electrode cover plate.

2. The lithium square battery of claim 1, wherein a side of the first housing is provided with a plurality of first relief notches; the first abdicating notch is semicircular; a plurality of second abdicating notches matched with the first abdicating notches are formed in the side face of the second shell; the second abdicating notch is semicircular.

3. The lithium square battery of claim 2, wherein when the first housing abuts the second housing, the first abdicating notch abuts the second abdicating notch to form a circular notch.

4. The square lithium battery of claim 3, wherein the barrier comprises a perforated barrier and a non-perforated barrier which are oppositely arranged on two sides of the battery cell; one end of the porous barrier strip is connected with the positive electrode cover plate, and the other end of the porous barrier strip is connected with the negative electrode cover plate; one end of the nonporous barrier strip is connected with the positive electrode cover plate, and the other end of the nonporous barrier strip is connected with the negative electrode cover plate.

5. The square lithium battery as claimed in claim 4, wherein the perforated barrier has a plurality of liquid injection holes; the liquid injection hole and the circular notch are concentrically arranged.

6. The square lithium battery as claimed in claim 4, wherein one end of the positive electrode cover plate is provided with a first mounting groove, and the other end is provided with a second mounting groove; a first connecting plate is arranged in the first mounting groove; a second connecting plate is arranged in the second mounting groove; the first connecting plate is connected with the perforated barrier strip; the second connecting plate is connected with the non-porous barrier strip.

7. The square lithium battery as claimed in claim 6, wherein one end of the negative electrode cap plate is provided with a third mounting groove, and the other end is provided with a fourth mounting groove; a third connecting plate is arranged in the third mounting groove; a fourth connecting plate is arranged in the fourth mounting groove; the third connecting plate is connected with the porous barrier strip; the fourth connecting plate is connected with the non-porous barrier strip.

8. The square lithium battery as claimed in claim 7, wherein the first mounting groove is disposed at the same side as the third mounting groove; the second mounting groove and the fourth mounting groove are arranged on the same side.

9. The square lithium battery as claimed in claim 1, wherein the positive electrode cover plate is further provided with a positive electrode soft connection; the positive electrode flexible connection is connected with a positive electrode tab of the battery cell; the negative electrode cover plate is also provided with a negative electrode flexible connection; the negative electrode flexible connection is connected with a negative electrode tab of the battery cell.

10. The lithium prismatic battery of claim 4, wherein said housing assembly further comprises a plurality of sealing pins for sealing; one end of the sealing nail is abutted to the perforated barrier strip, and the other end of the sealing nail is matched with the round notch.