阅读说明：本技术 方形电芯及电池 (Square electric core and battery ) 是由 李树人 聂荣健 常兴奇 李硕 史童男 于 2021-08-27 设计创作，主要内容包括：本发明公开了一种方形电芯及电池,方形电芯包括：壳体,壳体内设有容纳空间；极组,极组设在容纳空间内,极组的长度方向的一端设有正极耳且另一端设有负极耳,正极耳和负极耳沿着极组的宽度方向延伸；正极连接组件,位于容纳空间内的部分正极连接组件沿着正极耳的延伸方向连接正极耳；负极连接组件,位于容纳空间内的部分负极连接组件沿着负极耳的延伸方向连接负极耳。本发明通过设置正极耳与负极耳沿着极组的宽度方向延伸,设置部分正极连接组件沿着正极耳的延伸方向连接正极耳,设置部分负极连接组件沿着负极耳的延伸方向连接负极耳,改善电流密度分散情况,提高方形电芯性能。(The invention discloses a square battery cell and a battery, wherein the square battery cell comprises: the shell is internally provided with an accommodating space; the pole group is arranged in the accommodating space, one end of the pole group in the length direction is provided with a positive pole lug, the other end of the pole group is provided with a negative pole lug, and the positive pole lug and the negative pole lug extend along the width direction of the pole group; the positive electrode connecting assembly is positioned in the accommodating space and is connected with the positive electrode lug along the extending direction of the positive electrode lug; and the part of the negative electrode connecting assembly positioned in the accommodating space is connected with the negative electrode lug along the extending direction of the negative electrode lug. According to the invention, the positive electrode lug and the negative electrode lug extend along the width direction of the electrode group, part of the positive electrode connecting assembly is arranged to be connected with the positive electrode lug along the extending direction of the positive electrode lug, and part of the negative electrode connecting assembly is arranged to be connected with the negative electrode lug along the extending direction of the negative electrode lug, so that the current density dispersion condition is improved, and the performance of a square battery cell is improved.)

1. A square electrical core (100), comprising:

the device comprises a shell (10), wherein an accommodating space (13) is formed in the shell (10);

the pole group (20), the pole group (20) is arranged in the accommodating space (13), one end of the pole group (20) in the length direction is provided with a positive pole lug (24), the other end of the pole group is provided with a negative pole lug (25), and the positive pole lug (24) and the negative pole lug (25) extend along the width direction of the pole group (20);

the positive electrode connecting assembly (30) is arranged on the shell (10) and partially extends into the accommodating space (13), and part of the positive electrode connecting assembly (30) located in the accommodating space (13) is connected with the positive electrode lug (24) along the extending direction of the positive electrode lug (24);

the negative pole coupling assembling (40), establish on casing (10) and part extend to in accommodation space (13), lie in part in accommodation space (13) negative pole coupling assembling (40) are along the extending direction of negative pole ear (25) is connected negative pole ear (25).

2. The square battery cell (100) of claim 1, wherein the positive connection assembly (30) comprises: the positive pole (31) is arranged on the shell (10), the positive pole connecting plate (32) is located in the accommodating space (13) and connected with the positive pole (31), and the positive pole connecting plate (32) abuts against the positive pole lug (24) along the extending direction of the positive pole lug (24);

the negative electrode connection assembly (40) includes: negative pole post (41) and negative pole connecting plate (42), establish negative pole post (41) on casing (10), negative pole connecting plate (42) are located in accommodation space (13) and connect negative pole post (41), negative pole connecting plate (42) are along the extending direction butt of negative pole ear (25) is in on negative pole ear (25).

3. The square battery cell (100) of claim 2, wherein an overcurrent protection structure (323) is arranged on the positive connecting plate (32) and/or the negative connecting plate (42), and the overcurrent protection structure (323) can break a circuit when current is kept flowing on the positive connecting plate (32) or the negative connecting plate (42).

4. The square battery cell (100) of claim 3, wherein the positive connection plate (32) comprises: a first connection part (321) and a second connection part (322), wherein the first connection part (321) is connected with the positive post (31), and the second connection part (322) is connected with the positive lug (24);

the over-current protection structure (323) comprises: a plurality of connecting columns (3231) arranged at intervals, wherein one end of each connecting column (3231) is connected with the first connecting part (321) and the other end is connected with the second connecting part (322).

5. The square battery cell (100) of claim 2, wherein the casing (10) comprises:

the machine shell (11), the positive connecting plate (32) and the negative connecting plate (42) are arranged in the machine shell (11);

the top cover (12), establish top cover (12) on casing (11), positive post (31) with negative pole post (41) are established on top cover (12).

6. The square battery cell (100) of claim 2, wherein a first reserved space is formed among the positive tab (24), the positive connecting plate (32) and the casing (10), a second reserved space is formed among the negative tab (25), the negative connecting plate (42) and the casing (10), and the first reserved space and the second reserved space are used for filling electrolyte.

7. The square cell (100) of claim 6, wherein the square cell (100) further comprises: an adsorbate for adsorbing a gas, the adsorbate being disposed within the first headspace and the second headspace.

8. The square battery cell (100) of claim 1, wherein the housing (10) has a length W, a width T, and a height H, and wherein W is greater than or equal to 130mm and less than or equal to 170mm, T is greater than or equal to 0.15W and less than or equal to 0.2W, and H is greater than or equal to 0.6W and less than or equal to 0.7W.

9. The square-shaped cell (100) of claim 1, wherein the pole group (20) comprises:

each positive plate is provided with a positive tab (24), and the length of each positive tab (24) is equal to the width of each positive tab;

the negative pole pieces and the positive pole pieces are sequentially stacked in a staggered manner, each negative pole piece is provided with a negative pole lug (25), and the length of each negative pole lug (25) is equal to the width of each negative pole piece;

the diaphragm is arranged between any adjacent positive plate and the negative plate, and the diaphragm is arranged on the positive plate on the outermost side and the negative plate on the outermost side.

10. A battery, comprising: a plurality of square cells (100), the square cells (100) being a square cell (100) according to any of claims 1 to 9.

Technical Field

The invention relates to the technical field of batteries, in particular to a square battery core and a battery.

Background

In the batteries in the current market, the performance of lithium ion batteries (lithium ion batteries and lithium high polymer batteries) is the best, and the energy of the lithium ion batteries with the same quality is 4-6 times that of lead-acid batteries and 2-3 times that of nickel-hydrogen batteries.

Lithium ion batteries are mainly classified into three types, namely square, cylindrical and soft packages at present; the square and cylindrical shells are mainly made of hard shells of aluminum alloy, stainless steel and the like, and the soft package shell is made of an aluminum plastic film. For cylinder and soft package, square electric core has following advantage: 1) the space utilization rate of the square battery cell is higher, so the energy density of the square battery cell is higher; 2) the heat dissipation performance of the square battery core is relatively better; 3) the square battery cell has better cycle performance; 4) the manufacturing equipment investment threshold of the square electric core is low, and the power lithium ion battery for the electric vehicle at present mostly adopts the square electric core to improve the battery performance, reduce the cost and improve the battery safety. But the square cell on the market at present has poor performance.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the square battery cell, which increases the flow area and improves the performance of the square battery cell.

The invention also provides a battery, which increases the flow area and improves the performance of the battery.

According to an embodiment of the invention, a square battery cell comprises: the device comprises a shell, a shell and a cover, wherein an accommodating space is arranged in the shell; the pole group is arranged in the accommodating space, one end of the pole group in the length direction is provided with a positive pole lug, the other end of the pole group is provided with a negative pole lug, and the positive pole lug and the negative pole lug extend along the width direction of the pole group; the positive electrode connecting assembly is arranged on the shell and partially extends into the accommodating space, and part of the positive electrode connecting assembly positioned in the accommodating space is connected with the positive electrode lug along the extending direction of the positive electrode lug; the negative pole coupling assembling is established on the casing and part extend to in the accommodation space, be located part in the accommodation space the negative pole coupling assembling along the extending direction of negative pole ear is connected the negative pole ear.

According to the square battery cell provided by the embodiment of the invention, the positive electrode lug and the negative electrode lug extend along the width direction of the pole group, so that the areas of the positive electrode lug and the negative electrode lug are increased, the areas of the connection parts of the positive electrode lug and the negative electrode lug with the pole group are larger, the current density dispersion condition is improved, and the performance of the square battery cell is improved; the positive lug is connected with the positive lug along the extending direction of the positive lug by arranging part of the positive connecting assembly, so that the contact area of the positive lug and the positive connecting assembly is increased on the basis of increasing the area of the positive lug, and the flow area is increased; through setting up partial negative pole coupling assembling and connecting the negative pole ear along the extending direction of negative pole ear, increase negative pole ear and negative pole coupling assembling's area of contact on the basis of the area of increase negative pole ear, increase area of overflowing improves the current density dispersion condition, reduces square electric core temperature rise, improves the performance of square electric core.

In some embodiments, the positive connection assembly comprises: the positive pole is arranged on the shell, the positive pole connecting plate is positioned in the accommodating space and is connected with the positive pole, and the positive pole connecting plate abuts against the positive pole lug along the extending direction of the positive pole lug; the negative pole coupling assembling includes: negative pole post and negative pole connecting plate, the negative pole post is established on the casing, the negative pole connecting plate is located just connect in the accommodation space the negative pole post, the negative pole connecting plate along the extending direction butt of negative pole ear is in on the negative pole ear.

Specifically, an overcurrent protection structure is arranged on the positive electrode connecting plate and/or the negative electrode connecting plate, and the overcurrent protection structure can cut off a circuit when current is kept on the positive electrode connecting plate or the negative electrode connecting plate.

More specifically, the positive electrode connection plate includes: the first connecting part is connected with the positive post, and the second connecting part is connected with the positive lug; the overcurrent protection structure includes: the connecting columns are arranged at intervals, one end of each connecting column is connected with the first connecting part, and the other end of each connecting column is connected with the second connecting part.

In other embodiments, the housing comprises: the positive connecting plate and the negative connecting plate are arranged in the shell; the top cover is arranged on the shell, and the positive pole column and the negative pole column are arranged on the top cover.

In other specific embodiments, a first reserved space is formed among the positive tab, the positive connecting plate and the shell, a second reserved space is formed among the negative tab, the negative connecting plate and the shell, and the first reserved space and the second reserved space are used for filling electrolyte.

More specifically, the square battery cell further includes: an adsorbate for adsorbing a gas, the adsorbate being disposed within the first headspace and the second headspace.

Optionally, the length of the shell is W, the width of the shell is T, and the height of the shell is H, wherein W is larger than or equal to 130mm and smaller than or equal to 170mm, T is larger than or equal to 0.15W and smaller than or equal to 0.2W, and H is larger than or equal to 0.6W and smaller than or equal to 0.7W.

In some embodiments, the pole set comprises: each positive plate is provided with a positive tab, and the length of each positive tab is equal to the width of each positive tab; the negative pole pieces and the positive pole pieces are sequentially stacked in a staggered manner, each negative pole piece is provided with a negative pole lug, and the length of each negative pole lug is equal to the width of each negative pole piece; the diaphragm is arranged between any adjacent positive plate and the negative plate, and the diaphragm is arranged on the positive plate on the outermost side and the negative plate on the outermost side.

According to an embodiment of the present invention, a battery includes: the battery comprises a plurality of square battery cells, wherein each square battery cell is the square battery cell.

According to the battery provided by the embodiment of the invention, the positive electrode lug and the negative electrode lug extend along the width direction of the pole group, so that the areas of the positive electrode lug and the negative electrode lug are increased, the areas of the connection parts of the positive electrode lug and the negative electrode lug with the pole group are larger, the current density dispersion condition is improved, the square cell performance is improved, and the battery performance is improved; the positive lug is connected with the positive lug along the extending direction of the positive lug by arranging part of the positive connecting assembly, so that the contact area between the positive lug and the positive connecting assembly is increased on the basis of increasing the area of the positive lug, and the flow area is increased; through setting up partial negative pole coupling assembling and connecting the negative pole ear along the extending direction of negative pole ear, increase negative pole ear and negative pole coupling assembling's area of contact on the basis of the area of increase negative pole ear, increase the overcurrent area, improve the current density dispersion condition, reduce square electric core temperature rise, improve the performance of square electric core, improve the performance of battery.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic mechanism diagram of a square battery cell in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of the positive electrode connecting plate in the embodiment of the invention.

Reference numerals:

100. a square battery cell;

10. a housing; 11. a housing; 12. a top cover; 13. an accommodating space;

20. a pole group; 24. a positive tab; 25. a negative tab;

30. a positive electrode connecting assembly; 31. a positive post; 32. a positive electrode connecting plate; 321. a first connection portion; 322. a second connecting portion; 323. an overcurrent protection structure; 3231. connecting columns;

40. a negative electrode connecting assembly; 41. a negative pole post; 42. and a negative electrode connecting plate.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of illustrating the present invention and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the invention.

Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial.

In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements can be directly connected with each other or indirectly connected with each other through an intermediate medium, and the two elements can be communicated with each other. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The square battery cell 100 according to the embodiment of the present invention is described below with reference to the drawings.

As shown in fig. 1, a square battery cell 100 according to an embodiment of the present invention includes: the structure comprises a shell 10, a pole group 20, a positive pole connecting assembly 30 and a negative pole connecting assembly 40.

Be equipped with accommodation space 13 in the casing 10, through setting up accommodation space 13, various spare parts in the square electric core 100 are held to accommodation space 13, and the spare part in the accommodation space 13 is protected to casing 10, and casing 10 has improved the security of square electric core 100.

The pole group 20 is disposed in the accommodation space 13, a positive tab 24 is disposed at one end of the pole group 20 in the longitudinal direction, and a negative tab 25 is disposed at the other end, and the positive tab 24 and the negative tab 25 extend in the width direction of the pole group 20. Positive tab 24 and negative tab 25 are in the both ends of the length direction of utmost point group 20 respectively, positive tab 24 and negative tab 25 can not increase square electric core 100's height, reduce square electric core 100's height dimension, and the length direction's of utmost point group 20 both ends can provide bigger space for positive tab 24 and negative tab 25, positive tab 24 can be longer with negative tab 25 along the width direction extension of utmost point group 20, positive tab 24 obtains the increase with negative tab 25's area, thereby make positive tab 24, negative tab 25 is bigger with the face of being connected of utmost point group 20, increase the area of overflowing, improve current density's dispersion situation, make the inside temperature distribution of square electric core 100 even, improve square electric core 100's performance.

The positive electrode connecting assembly 30 is arranged on the casing 10 and partially extends into the accommodating space 13, part of the positive electrode connecting assembly 30 located in the accommodating space 13 is connected with the positive electrode tab 24 along the extending direction of the positive electrode tab 24, the positive electrode tab 24 is connected along the extending direction of the positive electrode tab 24 by arranging part of the positive electrode connecting assembly 30, the contact area between the positive electrode connecting assembly 30 and the positive electrode tab 24 is increased on the basis of the increased area of the positive electrode tab 24, the overcurrent area is increased, the dispersion condition of current density is improved, the temperature inside the square battery cell 100 is uniformly distributed, and the performance of the square battery cell 100 is further improved.

The negative pole coupling assembling 40 is established on casing 10 and partly extends to in accommodation space 13, the part negative pole coupling assembling 40 that is located accommodation space 13 connects negative pole ear 25 along the extending direction of negative pole ear 25, connect positive ear 24 along the extending direction of negative pole ear 25 through setting up part negative pole coupling assembling 40, increase the area of contact of negative pole coupling assembling 40 and negative pole ear 25 on the basis of negative pole ear 25 increase area, increase the overcurrent area, improve the dispersion situation of current density, make the inside temperature distribution of square electricity core 100 even, further improve the performance of square electricity core 100.

According to the square battery cell 100 provided by the embodiment of the invention, the positive tab 24 and the negative tab 25 are arranged to extend along the width direction of the pole group 20, so that the areas of the positive tab 24 and the negative tab 25 are increased, the areas of the connection parts of the positive tab 24, the negative tab 25 and the pole group 20 are larger, the current density dispersion condition is improved, and the performance of the square battery cell 100 is improved; the positive tab 24 is connected along the extending direction of the positive tab 24 by arranging part of the positive connection assembly 30, so that the contact area between the positive tab 24 and the positive connection assembly 30 is increased on the basis of increasing the area of the positive tab 24, and the flow area is increased; through setting up partial negative pole coupling assembling 40 and connecting negative pole ear 25 along the extending direction of negative pole ear 25, increase negative pole ear 25 and negative pole coupling assembling 40's area of contact on the basis of the area of increase negative pole ear 25, increase the overcurrent area, improve the current density dispersion condition, reduce square electric core 100 temperature rise, improve square electric core 100's performance.

As shown in fig. 1, in some embodiments, the positive connection assembly 30 includes: the positive post 31 is arranged on the shell 10, the positive connecting plate 32 is positioned in the accommodating space 13 and connected with the positive post 31, and the positive connecting plate 32 abuts against the positive lug 24 along the extending direction of the positive lug 24. For example, the extending direction of the positive electrode tab 24 is the vertical direction, the positive electrode connection plate 32 extends in the vertical direction, and the positive electrode tab 24 and the positive electrode connection plate 32 are completely bonded in the vertical direction, thereby increasing the flow area.

The negative electrode connection assembly 40 includes: negative pole post 41 and negative pole connecting plate 42, negative pole post 41 is established on casing 10, and negative pole connecting plate 42 is located accommodation space 13 and connects negative pole post 41, and negative pole connecting plate 42 is along the extending direction of negative pole ear 25 butt on negative pole ear 25. For example, the extending direction of the negative electrode tab 25 is the vertical direction, the negative electrode connection plate 42 extends in the vertical direction, and the negative electrode tab 25 and the negative electrode connection plate 42 are completely bonded in the vertical direction, thereby increasing the flow area.

As shown in fig. 1, optionally, the positive post 31 and the negative post 41 are disposed on the same side of the electrode group 20, and by disposing the positive post 31 and the negative post 41 on the same side of the electrode group 20, the positive post 31 and the negative post 41 exit from the same side of the square battery cell 100, and the square battery cell 100 is matched with a standard module in the prior art, so as to improve the universality.

As shown in fig. 2, specifically, the positive connecting plate 32 and/or the negative connecting plate 42 are provided with an overcurrent protection structure 323, and the overcurrent protection structure 323 can cut off a circuit when current is kept on the positive connecting plate 32 or the negative connecting plate 42. For example, the positive connecting plate 32 is provided with an overcurrent protection structure 323, and the overcurrent protection structure 323 disconnects the circuit when the current on the positive connecting plate 32 is over-protected; or, the negative connecting plate 42 is provided with an overcurrent protection structure 323, and the overcurrent protection structure 323 disconnects the circuit when the current on the negative connecting plate 42 is over-guaranteed; or, the positive connecting plate 32 and the negative connecting plate 42 are both provided with an overcurrent protection structure 323.

As shown in fig. 2, more specifically, the positive electrode connecting plate 32 includes: first connection portion 321 and second connection portion 322, first connection portion 321 connects positive post 31, and second connection portion 322 connects positive tab 24.

The overcurrent protection structure 323 includes: a plurality of connecting posts 3231 disposed at intervals, each connecting post 3231 having one end connected to the first connecting portion 321 and the other end connected to the second connecting portion 322. For example, the connecting columns 3231 are two, the two connecting columns 3231 are arranged at intervals, the upper ends of the two connecting columns 3231 are connected with the first connecting portions 321, the lower ends of the two connecting columns 3231 are connected with the second connecting portions 322, and when current overcurrent occurs, the two connecting columns 3231 are fused at high temperature, so that the square battery core 100 is protected, and safety is improved.

In some embodiments, the first connection portion 321 is soldered to the positive post 31 and the second connection portion 322 is soldered to the positive tab 24.

In some embodiments, the negative connection plate 42 includes: first connection portion 321 and second connection portion 322, first connection portion 321 connects negative post 41, and second connection portion 322 connects negative tab 25.

The overcurrent protection structure 323 includes: a plurality of connecting posts 3231 disposed at intervals, each connecting post 3231 having one end connected to the first connecting portion 321 and the other end connected to the second connecting portion 322. For example, the connecting columns 3231 are two, the two connecting columns 3231 are arranged at intervals, the upper ends of the two connecting columns 3231 are connected with the first connecting portions 321, the lower ends of the two connecting columns 3231 are connected with the second connecting portions 322, and when current overcurrent occurs, the two connecting columns 3231 are fused at high temperature, so that the square battery core 100 is protected, and safety is improved.

In some embodiments, first connection 321 is welded to negative post 41 and second connection 322 is welded to negative tab 25.

In other embodiments, as shown in fig. 1, the housing 10 includes: a housing 11 and a top cover 12.

The positive connection plate 32 and the negative connection plate 42 are provided in the casing 11. Top cover 12 is provided on housing 11, and positive post 31 and negative post 41 are provided on top cover 12. For example, top cover 12 is disposed on the top end of housing 11, top cover 12 closes accommodation space 13, positive post 31 and negative post 41 are disposed on the upper side of top cover 12, positive post 31 is disposed on the left side of top cover 12, and negative post 41 is disposed on the right side of top cover 12.

In other specific embodiments, a first reserved space (not shown) is formed between the positive tab 24, the positive connection plate 32 and the casing 10, a second reserved space (not shown) is formed between the negative tab 25 and the negative connection plate 42, the first reserved space and the second reserved space are used for filling electrolyte, and the first reserved space and the second reserved space are used for filling electrolyte by arranging the first reserved space and the second reserved space, so that the electrolyte injection amount of the square battery cell 100 is increased, and the cycle performance of the square battery cell 100 is improved. The electrolyte has high conductivity, and the conductivity of the electrolyte is more than 4mS/cm under the condition of minus 10 ℃.

More specifically, the square battery cell 100 further includes: and the adsorbate (not shown in the figure) for adsorbing the gas is arranged in the first reserved space and the second reserved space, and the adsorbate adsorbs the gas in the accommodating space 13 by arranging the adsorbate, so that the gas generation condition of the square battery cell 100 is reduced. Wherein the adsorbate is one or more of silicon-coated modified nano calcium carbonate, metal organic frameworks, magnesium oxide doped silicon-based mesoporous materials, silica gel, mesoporous molecular sieve raw powder and moso bamboo activated carbon. For example, the coating material of the pole group 20 is NCM material, which generates gas, causing a problem in the square battery cell 100, and the adsorbate is moso bamboo activated carbon, which adsorbs the gas generated by MCN inside. It can be understood that the electrolyte has certain corrosivity, the material of adsorbate makes it can not corroded in the electrolyte, and the adsorbate itself volume does not have any change after adsorbing gas moreover, and the adsorbate still has good adsorption effect in high temperature or low temperature environment simultaneously, and the material of adsorbate has certain bionic property simultaneously.

Optionally, the length of the housing 10 is W, the width is T, and the height is H, wherein W is larger than or equal to 130mm and smaller than or equal to 170mm, T is larger than or equal to 0.15W and smaller than or equal to 0.2W, and H is larger than or equal to 0.6W and smaller than or equal to 0.7W. For example, W is 130mm, T is 20mm, H is 80 mm; or W is 150mm, T is 25mm, and H is 100 mm; further alternatively, W is 170mm, T is 30mm, and H is 110 mm.

In some embodiments, pole set 20 includes: a plurality of positive electrode tabs (not shown), a plurality of negative electrode tabs (not shown), and a separator (not shown).

And each positive plate is provided with a positive tab 24, the length of each positive tab 24 is equal to the width of the positive plate, and the length of each positive tab 24 is equal to the width of the positive plate, so that the connection area between each positive tab 24 and the positive plate is increased, the overcurrent area is increased, the current density is well dispersed, and the temperature consistency of each part of the square battery core 100 is improved. For example, the dimension of the positive tab 24 in the vertical direction is the length of the positive tab 24, and the dimension of the positive plate in the vertical direction is the width of the positive plate, compared with the prior art in which the positive tab 24 is die-cut, the invention omits the die-cutting process and reduces the cost by setting the length of the positive tab 24 equal to the width of the positive plate.

A plurality of negative pole pieces and a plurality of positive plate are crisscross to be piled up the setting in proper order, are equipped with negative pole ear 25 on every negative pole piece, and the length of negative pole ear 25 equals the width of negative pole piece, and the length through setting up negative pole ear 25 equals the width of negative pole piece, and the area of being connected of increase negative pole ear 25 and negative pole piece increases the overcurrent area, makes the current density dispersion good, improves the uniformity of each position temperature of square electric core 100. For example, the dimension of the negative electrode tab 25 in the vertical direction is the length of the negative electrode tab 25, and the dimension of the negative electrode sheet in the vertical direction is the width of the negative electrode sheet, compared with the negative electrode sheet die-cut negative electrode tab 25 in the prior art, the length of the negative electrode tab 25 is equal to the width of the negative electrode sheet, so that the die-cut process is omitted, and the cost is reduced.

And a diaphragm is arranged between any adjacent positive plate and negative plate, and the positive plate on the outermost side and the negative plate on the outermost side are provided with diaphragms.

In some embodiments, the positive electrode sheet is made of aluminum, and the negative electrode sheet is made of copper.

Specifically, the positive plate is provided with a positive coating (not shown), the material of the positive coating is one of NCM532 and NCM111, and of course, the material of the positive coating may also be other materials with better rate performance. For example, the material of the positive coating is NCM532, so that the safety performance is improved, and the safety test of needling, 1.5 times of overcharging and 150 ℃ hot box can be performed.

More specifically, the negative electrode sheet is provided with a negative electrode coating (not shown), and the material of the negative electrode coating is graphite coated with a soft carbon material.

In some embodiments, the separator is a 16um base film.

An embodiment of the square battery cell 100 of the present invention is described below with reference to fig. 1 and fig. 2.

A square-shaped battery cell 100 includes: the structure comprises a shell 10, a pole group 20, a positive pole connecting assembly 30, a negative pole connecting assembly 40 and adsorbates.

The housing 10 includes a cabinet 11 and a top cover 12. The housing 11 is provided with an accommodating space 13. The top cover 12 is provided on the cabinet 11. The housing 10 has a length W, a width T and a height H, wherein W is 150mm, T is 25mm and H is 100 mm.

The pole group 20 is disposed in the accommodating space 13, and the pole group 20 includes: a plurality of positive plates, a plurality of negative plates and a diaphragm.

The left end of the positive plate is provided with a positive lug 24, and the length of the positive lug 24 is equal to the width of the positive plate. A plurality of negative pole pieces and a plurality of positive plate are crisscross to be piled up the setting in proper order, and the right-hand member of every negative pole piece is equipped with negative pole ear 25, and the length of negative pole ear 25 equals with the width of negative pole piece. The diaphragm is arranged between any adjacent positive plate and negative plate, and the positive plate on the outermost side and the negative plate on the outermost side are provided with diaphragms.

The positive electrode connection member 30 includes a positive electrode post 31 and a positive electrode connection plate 32. The positive post 31 is provided on the top cover 12. The positive electrode connection plate 32 includes: an overcurrent protection structure 323, a first connection 321, and a second connection 322. The first connection part 321 is connected with the positive post 31, the second connection part 322 is connected with the positive tab 24, and the second connection part 322 is abutted against the positive tab 24 along the extending direction of the positive tab 24, namely, the positive connection plate 32 is abutted against the positive tab 24 along the vertical direction; the overcurrent protection structure 323 includes two connection posts 3231 disposed at intervals, and one end of each connection post 3231 is connected to the first connection portion and the other end is connected to the second connection portion 322.

Negative pole coupling assembling 40 includes negative pole post 41 and negative pole connecting plate 42, and negative pole post 41 is established on top cap 12, and negative pole connecting plate 42 is located accommodation space 13 and connects negative pole post 41, and negative pole connecting plate 42 is along the extending direction butt on negative pole ear 25 of negative pole ear 25, and negative pole connecting plate 42 is along the butt on positive ear 24 of upper and lower direction.

A first reserved space is formed among the positive tab 24, the positive connecting plate 32 and the casing 10, a second reserved space is formed among the negative tab 25 and the negative connecting plate 42, and the first reserved space and the second reserved space are used for filling electrolyte.

The adsorbate is silica gel, and the adsorbate is used for adsorbing gas, and the adsorbate is established in first headspace and second headspace.

According to an embodiment of the present invention, a battery includes: a plurality of square battery cells 100, the square battery cells 100 are the above-mentioned square battery cells 100.

According to the battery provided by the embodiment of the invention, the positive tab 24 and the negative tab 25 are arranged to extend along the width direction of the pole group 20, so that the areas of the positive tab 24 and the negative tab 25 are increased, the areas of the connection parts of the positive tab 24, the negative tab 25 and the pole group 20 are larger, the current density dispersion condition is improved, the performance of the square battery core 100 is improved, and the battery performance is improved; the positive tab 24 is connected along the extending direction of the positive tab 24 by arranging part of the positive connection assembly 30, so that the contact area of the positive tab 24 and the positive connection assembly 30 is increased on the basis of increasing the area of the positive tab 24, and the flow area is increased; connect negative pole ear 25 along the extending direction of negative pole ear 25 through setting up partial negative pole coupling assembling 40, increase negative pole ear 25 and negative pole coupling assembling 40's area of contact on the basis of the area of increase negative pole ear 25, increase the overcurrent area, improve the current density dispersion condition, reduce square electric core 100 temperature rise, improve square electric core 100's performance, improve the performance of battery.

Other configurations and operations of the square battery cell 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description herein, references to the description of the terms "embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.