CN218039723U - Battery core and battery pack - Google Patents

Abstract

The utility model discloses an electric core, electric core includes: a cap assembly including a current collector; the pole core comprises a pole core main body and a plurality of first lugs, and the first lugs are arranged on the same side of the pole core main body and are suitable for being connected with the current collecting piece. Therefore, the plurality of first tabs are connected with the current collecting plate, so that a plurality of conductive links are formed inside the battery cell and connected in parallel, and the total ohmic internal resistance of the battery cell is reduced. Simultaneously, the part quantity in the electric core in this application is few, can promote the energy density of electric core.

Description

Battery core and battery pack

Technical Field

The utility model belongs to the technical field of the battery and specifically relates to an electricity core and battery package are related to.

Background

The internal resistance of the battery mainly comprises ohmic internal resistance and polarization internal resistance, and can be known by Joule's law: under the condition of constant current intensity, the smaller the internal resistance of the battery is, the less Joule heat is generated by the battery, and the stronger the current capacity of the battery is.

In the related art, a prismatic aluminum-can battery (especially a long battery with a total length of more than 300 mm) is formed by connecting a tab with a cap assembly through a connecting plate to achieve circuit connection between an internal electrode core of the battery and an external circuit, which results in large internal resistance of the battery, generation of a large amount of joule heat in the battery, and poor current flowing capability of the battery, which affects the safety of the battery.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the utility model is to provide an electric core, the connected mode between the electrically conductive link of this electric core is parallelly connected, greatly reduced the ohmic internal resistance of electric core, more be favorable to controlling the through-flow of electric core and heat up, improved the security performance of electric core.

According to the utility model discloses an electricity core, include: a cap assembly including a current collecting sheet; the pole core, the pole core includes pole core main part and a plurality of first utmost point ear, first utmost point ear by a plurality of pole pieces of same polarity extend in the pole core main part and draw forth and pile up and form, and be a plurality of first utmost point ear is located same one side of pole core main part, and be suitable for with the piece that collects the current links to each other.

According to the utility model discloses an electricity core, utmost point core pass through utmost point ear and current collector piece directly link to each other, and this kind of setting can reduce the inside adapting unit's of electric core quantity, has improved the energy density of electric core, has reduced adapting unit's ohmic internal resistance simultaneously, has effectively reduced the joule heat that electric core produced, has promoted the security performance of electric core.

According to the utility model discloses an embodiment, it is a plurality of first utmost point ear is arranged at the interval in the first direction, just at least part and a plurality of current collector first utmost point ear sets up relatively, first direction does the length direction or the width direction of utmost point core main part.

According to the utility model discloses an embodiment, the current collector with a side surface that first utmost point ear carried on the back mutually is equipped with a plurality of utmost points post.

According to the utility model discloses an embodiment on the projection of lid subassembly thickness direction, the projection of utmost point post is in the projection within range of first utmost point ear.

According to the utility model discloses an embodiment, utmost point post with the quantity of first utmost point ear is the same and the one-to-one setting.

According to the utility model discloses an embodiment, the current collector with a plurality of utmost point post integrated into one piece.

According to the utility model discloses an embodiment, a plurality of first utmost point ears are in length dimension on the first direction is L1, the current collector piece is in length dimension on the first direction is L2, and L1 is less than or equal to L2.

According to the utility model discloses an embodiment, the pole core still includes a plurality of second utmost point ears, and is a plurality of the second utmost point ear respectively by a plurality of pole pieces of the same polarity extend in the pole core main part and draw forth, and a plurality of the second utmost point ear is located same one side of pole core main part, and be suitable for with the current collector piece links to each other.

According to the utility model discloses an embodiment, it is a plurality of first utmost point ear and a plurality of second utmost point ear is located respectively the both sides of utmost point core main part, just the polarity of first utmost point ear and second utmost point ear is different.

According to the utility model discloses a battery pack, including above-mentioned arbitrary electricity core. Because the battery cell is arranged in the battery pack, the energy density of the battery pack is improved, and the battery pack has better through-current capacity and improved safety performance because the ohmic internal resistance of the battery pack is smaller.

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 partial schematic view one of a pole piece according to an embodiment of the present invention;

fig. 2 is a partial schematic view ii of a pole piece according to an embodiment of the present invention;

fig. 3 is a partial schematic view three of a pole piece according to an embodiment of the present invention;

fig. 4 is a front view of a cap assembly according to an embodiment of the present invention;

fig. 5 is a bottom view of a cap assembly according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of a cap assembly according to an embodiment of the present invention;

FIG. 7 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 5;

fig. 8 is a diagram of a conductive link of a battery cell according to an embodiment of the present invention.

Reference numerals are as follows:

a cap assembly 110, a current collecting plate 111, a pole 111a, an insulating member 112,

Pole piece 120, pole piece main part 121, first utmost point ear 122.

Detailed Description

Reference will now be made in detail to the 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 exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

A cell according to an embodiment of the present invention is described below with reference to fig. 1-8.

According to the utility model discloses an electricity core, include: a cap assembly 110 and a pole piece 120.

Referring to fig. 5, the cover assembly 110 includes a current collecting plate 111, the current collecting plate 111 is used for collecting and conducting current inside the battery cell, the material of the current collecting plate 111 may be selected from copper and other materials that have high conductivity, good heat dissipation, easy welding, and corrosion resistance, and the selection of the material of the current collecting plate 111 may solve the safety problem of the battery cell caused by temperature rise.

As shown in fig. 1, the pole core 120 includes a pole core main body 121 and a plurality of first tabs 122, the first tabs 122 are extended out and stacked from a plurality of pole pieces of the same polarity in the pole core main body 121, and the plurality of first tabs 122 are disposed on the same side of the pole core main body 121, and the plurality of first tabs 122 may be connected to the current collector 111.

The plurality of pole pieces in the pole core main body 121 are arranged in a stacked manner, and each first tab 122 is formed by extending and leading out the pole pieces with the same polarity among the plurality of pole pieces and stacking the pole pieces. When the plurality of first tabs 122 are respectively connected and matched with the current collecting plate 111, the plurality of first tabs 122 are arranged in parallel, so that a plurality of conductive links are formed, and the total ohmic internal resistance of the battery cell is low.

Therefore, each first tab 122 is connected with the current collector 111 respectively, so that a plurality of conductive links arranged in parallel are formed inside the battery cell, the total ohmic internal resistance of the battery cell is reduced, and the current capacity of the battery cell is improved. Meanwhile, because the total ohmic internal resistance of the battery cell is reduced, the joule heat generated by the ohmic internal resistance is reduced, the possibility of safety accidents caused by the temperature rise of the battery cell is reduced, and the service life of the battery cell is prolonged. Wherein the size of the current collector 111 is adapted to the overall size of the plurality of first tabs 122.

In the correlation technique, the cover component in the battery core is connected and matched with the pole lug through the connecting sheet, the connecting sheet is connected with the pole lug in an ultrasonic welding mode, and the total ohmic internal resistance of the battery core is increased due to the use of the connecting sheet.

Compared with the prior art, the first tab 122 and the current collecting piece 111 are directly connected and fixed, and a connecting piece is omitted, so that the total ohmic internal resistance of the battery cell is reduced, the number of parts in the battery cell is reduced, and the energy density of the battery cell is improved.

According to the utility model discloses electric core is through being connected a plurality of first utmost point ear 122 with current collector 111 to constitute a plurality of electrically conductive links in the inside of electric core, and parallelly connected between a plurality of electrically conductive links, with the total ohmic internal resistance that reduces electric core. Simultaneously, the part quantity in the electric core in this application is few, can promote the energy density of electric core.

In an embodiment of the present invention, the plurality of first tabs 122 are spaced apart from each other in the first direction, and at least a portion of the current collecting piece 111 is disposed opposite to the plurality of first tabs 122, so as to connect the current collecting piece 111 to the plurality of first tabs 122. The first direction is a length direction or a width direction of the pole piece 120.

Specifically, the plurality of first tabs 122 are formed by extending different pole pieces with the same polarity in the pole core main body 121, the plurality of first tabs 122 may be disposed on the same side of the battery cell in the length direction, and the plurality of first tabs 122 may also be disposed on the same side of the battery cell in the width direction. Wherein a plurality of first tabs 122 are provided at one side of the pole core 120.

Further, the plurality of first tabs 122 are arranged at intervals in the arrangement direction, so that the current collecting plate 111 is connected and matched with the plurality of first tabs 122, and interference between the plurality of first tabs 122 is avoided.

With reference to fig. 5, 6 and 7, in an embodiment of the present invention, a plurality of poles 111a are disposed on a surface of the current collecting plate 111 opposite to the first tab 122, and ends of the poles 111a are connected to the current collecting plate 111. Here, the "plurality of poles 111a" means at least two.

As shown in fig. 1, in particular, the pole column 111a is a segment of a metal column structure having a conductive function, and is configured to be plural, and when the number of the first tab 122 exceeds two (e.g., three, four, etc.), the pole column 111a may also be configured to be plural (e.g., three, four, etc.) as many as the first tab 122. One end of the pole 111a is connected with the current collecting piece 111, and the other end is connected with an external circuit, and the pole is used for conducting electricity from the inside of the battery cell to the external circuit so as to supply power to the external circuit; or the electricity from the external circuit is conducted to the inside of the battery cell, so that the charging function of the battery cell is realized.

Referring to fig. 1 and 5, in an embodiment of the present invention, when the current collecting plate 111 is connected to the plurality of first tabs 122, a projection of the pole 111a is within a projection range of the first tabs 122 in a projection in a thickness direction of the cap assembly 110.

The width of the tab is greater than the diameter of the pole 111a or equal to the diameter of the pole 111a, so that the projection of the pole 111a can completely fall within the projection range of the first tab 122.

With reference to fig. 1 and 5, in an embodiment of the present invention, the pole posts 111a and the first tabs 122 are the same in number and are arranged in a one-to-one correspondence.

Specifically, when the current collecting plate 111 is provided with three poles 111a, the pole core 120 is provided with three first tabs 122, and when the current collecting plate 111 is connected and matched with a plurality of first tabs 122, the three poles 111a and the three first tabs 122 are arranged in a one-to-one correspondence manner, so that the current collecting plate 111 is matched with the plurality of tabs, and an auxiliary assembling effect can be achieved.

As shown in fig. 6, in an embodiment of the present invention, the current collecting plate 111 is integrally formed with a plurality of poles 111 a.

Specifically, when the current collector 111 and the plurality of poles 111a are integrally formed, the size of the current collector 111 may be increased, so as to increase the cross-sectional area and the heat conduction area of the current collector 111, which is beneficial to controlling joule heat generated by the battery cell during the current flowing process, so as to improve the safety of the battery cell.

It can be understood that when the electrode post 111a is connected to the current collecting plate 111 by welding, internal resistance is generated at the welding point, which results in that the internal resistance of the cell becomes large. The application can effectively avoid the situation that the internal resistance of the connection part of the polar post 111a and the current collecting sheet 111 becomes large by constructing the plurality of polar posts 111a and the current collecting sheet 111 as an integral molding.

In a specific embodiment of the present invention, the current collecting plate 111 is provided with three poles 111a, and the three poles 111a are rA, rB and rC, respectively. In an embodiment of the present invention, the length dimension of the first tabs 122 in the first direction is L1, the length dimension of the current collecting plate 111 in the first direction is L2, and L1 is not more than L2. Therefore, the current collecting plate 111 can be sufficiently provided to correspond to the plurality of first tabs 122, and the current collecting plate 111 can be easily coupled to the plurality of first tabs 122.

In an embodiment of the present invention, the pole core 120 further includes a plurality of second pole lugs, the second pole lugs are respectively extended from a plurality of pole pieces with the same polarity in the pole core main body 121, and the second pole lugs are disposed on the same side of the pole core main body 121 and connected to the current collecting piece 111.

The plurality of pole pieces in the pole core main body 121 are arranged in a stacked manner, and each second pole lug is formed by extending and leading out a pole piece with the same polarity in the plurality of pole pieces. When the plurality of second lugs are respectively connected and matched with the current collecting plate 111, the plurality of second lugs are arranged in parallel, so that a plurality of conductive links are formed, and the total ohmic internal resistance of the battery cell is low.

Therefore, each second pole lug is connected with the current collecting piece 111 respectively so as to form a plurality of conductive links which are arranged in parallel in the battery cell, so that the total ohmic internal resistance of the battery cell is reduced, and the current capacity of the battery cell is improved. Meanwhile, because the total ohmic internal resistance of the battery cell is reduced, the joule heat generated by the ohmic internal resistance is reduced, the possibility of safety accidents caused by the temperature rise of the battery cell is reduced, and the service life of the battery cell is prolonged. Wherein the size of the current collector 111 is adapted to the total size of the plurality of second pole ears.

In an embodiment of the present invention, the first tabs 122 and the second tabs are respectively disposed on two sides of the core body 121, and the first tabs and the second tabs have different polarities.

Specifically, the plurality of first tabs 122 are of a different polarity than the plurality of second tabs. When the plurality of first tabs 122 are configured as positive tabs, then the plurality of second tabs are configured as negative tabs.

In addition, the structural arrangement and advantages of the side pole 111a where the second tabs are located and the cover assembly 110 are the same as those of the side where the first tabs 122 are located, which is not repeated herein.

In some embodiments of the present invention, the tab (including the first tab 111 and the second tab) is provided with a bent portion, taking the first tab 122 as an example, when the first tab 122 is connected and mated with the current collecting plate 111, the first tab 122 can be bent at the bent portion, so as to adjust the cover assembly 110 to an angle suitable for being mated and fixed with the pole core 120. The bending angle may be 90 °, and the specific angle and bending manner are not limited herein.

Optionally, the position of the bent portion may be adjusted according to the flow rate of the battery cell, when the flow rate of the battery cell is large, the bent portion may be disposed at an end of the first tab 122 close to the pole core main body 121 to increase the flow area of the first tab 122 and the current collecting piece 111, when the flow rate of the battery cell is small, the bent portion may be disposed at an end of the first tab 122 close to the cover assembly 110, and a certain interval is provided between the current collecting piece 111 and the pole core main body 121.

The specific structure of the battery cell using the novel embodiment is briefly described below by using a specific embodiment.

Referring to fig. 1, 5 and 6, the pole core 120 is provided with three first tabs 122, and the current collecting plate 111 of the cap assembly 110 corresponds to and is in connection fit with the three first tabs 122 so as to electrically connect all of the three first tabs 122 with the current collecting plate 111. The current collecting plate 111 is provided with three poles 111a, and when the current collecting plate 111 is connected and fitted with the three first tabs 122, the three poles 111a and the three first tabs 122 are correspondingly arranged.

Referring to fig. 2, the pole core 120 is provided with two first tabs 122, and the current collecting plate 111 of the cap assembly 110 corresponds to and is in connection fit with the two first tabs 122 to electrically connect both the two first tabs 122 with the current collecting plate 111. The current collecting plate 111 is provided with two poles 111a, and when the current collecting plate 111 is connected and matched with the two first tabs 122, the two poles 111a and the two first tabs 122 are correspondingly arranged.

Further, referring to fig. 4 and 7, an insulating member 112 is further disposed on the cap assembly 110, and the insulating member 112 may be disposed to provide safety protection and corrosion resistance. The material of the insulating member 112 may be selected from high and low temperature resistant and aging resistant materials such as silicone rubber.

It should be noted that the current collecting plates 111 are configured in two to connect the first tab 122 and the second tab, respectively.

Referring to fig. 8, fig. 8 shows a conductive link of a battery cell according to a specific embodiment of the present invention.

The tab A and the tab B are first tabs, the tab E and the tab D are second tabs, the welding mark A is a welding mark between the tab A and the current collecting plate 111, the welding mark B is a welding mark between the tab B and the current collecting plate 111, the welding mark E is a welding mark between the tab E and the current collecting plate 111, and the welding mark D is a welding mark between the tab D and the current collecting plate 111.

The ohmic resistance of the pole in this application is R _{Positive pole A} //R _{Positive pole B} +R _{Negative pole E} //R _{Negative pole D} The resistance of laser welding is ∈ (1/S) _{Collector plate 2} ) R of tab _{Positive tab A} //R _{Positive tab B} +R _{Negative electrode tab E} //R _{Negative electrode tab D} Compared with the prior art, the resistance of the pole and the pole lug is smaller in the application, and the resistance of the connecting sheet and the ultrasonic welding mark does not exist. Therefore, the battery cell in the application can effectively reduce the total ohmic internal resistance in the conductive link, can improve the charge and discharge performance of the battery cell, and is more suitable for the design of the battery cell with the quick charge requirement.

According to the utility model discloses electric core, through set up a plurality of first utmost point ears 122 and a plurality of second utmost point ear on utmost point core 120, every first utmost point ear 122 all links to each other with its current collector piece 111 that corresponds lid subassembly 110, and every second utmost point ear all links to each other with its current collector piece 111 that corresponds lid subassembly 110 to constitute a plurality of parallelly connected conductive links inside electric core, reduce the total ohmic resistance of electric core. Simultaneously, a plurality of utmost point posts 111a in this application lid subassembly 110 and same current collector piece 111 integrated into one piece to can increase current collector piece 111's size, increase current collector piece 111's cross sectional area size, promote current collector piece 111's heat conduction area, and then can control the temperature rise, promote the security of electric core.

According to the utility model discloses battery package, including above-mentioned arbitrary electricity core. Because the battery pack has the above electric core structure, the total ohmic internal resistance of the battery pack is relatively small, and the control of the through-flow temperature of the battery pack is more facilitated, so that the safety of the battery pack is ensured, and the service life of the battery pack is prolonged. In addition, the number of parts in the battery pack is small, and the energy density of the battery pack is improved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like 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 present 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 present 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.

Claims (10)

1. A battery cell, comprising:

a cap assembly (110), the cap assembly (110) including a current collecting sheet (111);

the pole piece (120), pole piece (120) include pole piece main part (121) and a plurality of first utmost point ear (122), first utmost point ear (122) by a plurality of pole pieces of the same polarity extend in pole piece main part (121) and draw and pile up and form, and are a plurality of first utmost point ear (122) are located same one side of pole piece main part (121), and be suitable for with current collector (111) link to each other.

2. The battery cell of claim 1, wherein a plurality of the first tabs (122) are arranged at intervals in a first direction, and at least part of the current collecting plate (111) is arranged opposite to the plurality of the first tabs (122), and the first direction is a length direction or a width direction of the core body (121).

3. The battery cell of claim 2, wherein a plurality of poles (111 a) are arranged on a surface of the current collector sheet (111) opposite to the first tab (122).

4. The battery cell of claim 3, wherein a projection of the pole column (111 a) is within a projection range of the first tab (122) in a projection in a thickness direction of the cover assembly (110).

5. The electric core of claim 4, wherein the pole posts (111 a) and the first tabs (122) are in the same number and are arranged in a one-to-one correspondence.

6. The cell of claim 3, wherein the current collector sheet (111) is integrally formed with the plurality of poles (111 a).

7. The battery cell of claim 2, wherein the length dimension of the first tabs (122) in the first direction is L1, the length dimension of the current collector (111) in the first direction is L2, and L1 ≦ L2.

8. The electric core of claim 1, wherein the pole core (120) further comprises a plurality of second pole tabs, the second pole tabs are respectively extended and led out from a plurality of pole pieces with the same polarity in the pole core main body (121), and the second pole tabs are arranged on the same side of the pole core main body (121) and are adapted to be connected with the current collecting piece (111).

9. The battery cell of claim 8, wherein a plurality of the first tabs (122) and a plurality of the second tabs are respectively disposed on two sides of the core body (121), and the first tabs (122) and the second tabs have different polarities.

10. A battery pack comprising the electrical core of any of claims 1-9.

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