CN216213732U

CN216213732U - Soft-packaged electrical core and battery pack

Info

Publication number: CN216213732U
Application number: CN202122623497.0U
Authority: CN
Inventors: 李树人; 史童男; 聂荣健; 朱开鑫; 李硕; 贾永强
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-04-05
Anticipated expiration: 2031-10-29

Abstract

The utility model belongs to the technical field of power batteries, and discloses a soft package battery core and a battery pack, wherein the soft package battery core comprises a battery core shell and two cover plates which are buckled with each other and are in sealed connection, the two cover plates are respectively provided with a pit through pit punching, the two pit grooves jointly form an installation cavity, the cover plates are made of aluminum-plastic films, and at least one corner of the same position of the two cover plates is provided with a chamfer notch so as to expose an aluminum layer in the aluminum-plastic films; the battery core pole group is arranged in the installation cavity; the battery core tab comprises a positive tab and a negative tab, one end of the positive tab is located outside the cover plate, the other end of the positive tab is arranged between the first ends of the two cover plate sides and connected to the battery core tab group, one end of the negative tab is located outside the cover plate, and the other end of the negative tab is arranged between the second ends of the two cover plate sides and connected to the battery core tab group. The pit is punched through the two cover plates to form the pit slot, and the two pit slots form the installation cavity to install the battery core pole group, so that the process operation is simple and easy to realize, the packaging is easy, and the production efficiency is improved.

Description

Soft-packaged electrical core and battery pack

Technical Field

The utility model relates to the technical field of power batteries, in particular to a soft package battery core and a battery pack.

Background

A Plug-in hybrid electric vehicle (PHEV) is a novel hybrid electric vehicle. The power battery that plug-and-play electric hybrid vehicle of PHEV battery adopted, power battery's electric core mainly divide into square, circular and soft package three big types usually, and the crust of square and circular electric core mainly adopts duricrust such as aluminum alloy, stainless steel, and soft package electricity core then adopts the plastic-aluminum membrane to soft package electricity core all has comparatively obvious advantage in aspects such as energy density, security, lightweight and circulation performance, and consequently, more PHEV battery package adopt soft package electricity core.

The soft-packaged battery core size of current PHEV battery package all depends on VDA platform and MEB platform standard size to develop, and adopt homonymy to go out utmost point ear, multipolar group on structural design, this heat dissipation that not only can influence electric core influences security and reliability, also can influence the power performance, and simultaneously, it still can lead to the technology operation complicacy when carrying out the battery package equipment, and production efficiency reduces, and also can lead to space utilization lower moreover, causes the battery package cost to rise.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a soft-packaged battery cell and a battery pack, which can enable the process operation to be simple and easy to realize, are easy to package and improve the production efficiency.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a flexible-package electrical core comprising:

the battery cell comprises a battery cell shell, wherein the battery cell shell comprises two cover plates which are buckled with each other and are in sealed connection, pit grooves are formed in the two cover plates through pit punching, the two pit grooves jointly form an installation cavity, the cover plates are made of aluminum-plastic films, and a chamfer notch is formed in at least one corner of the same position of the two cover plates so that an aluminum layer in the aluminum-plastic films is exposed;

the battery cell pole group is arranged in the installation cavity;

electric core utmost point ear, including anodal utmost point ear and negative pole utmost point ear, anodal utmost point ear one end is located outside the apron, the other end is worn to locate two just connect in between the first end of apron homonymy extremely organize in electric core, negative pole utmost point ear one end is located outside the apron, the other end is worn to locate two just connect in between the second end of apron homonymy extremely organize in electric core.

Preferably, the battery cell shell is of a cuboid structure, the length L of the battery cell shell is less than or equal to 320mm, and the width H and the thickness T meet the following requirements: h is more than or equal to 25 percent and less than or equal to 35 percent, and T is more than or equal to 1 percent and less than or equal to 5 percent.

Preferably, the widths W of the positive electrode tab and the negative electrode tab satisfy: w is more than or equal to 10% and less than or equal to 20% of L, and the thickness of the positive electrode lug and the negative electrode lug is 0.3mm-0.4 mm.

Preferably, the battery core electrode group is a laminated single-electrode group, and the battery core electrode group is formed by stacking a positive plate and a negative plate through a Z-shaped lamination process.

Preferably, the positive plate is made of a lithium iron phosphate material.

Preferably, the two ends of the cell shell in the width direction are respectively folded, and the folded edge at least one end is a double-folded structure, the double-folded structure includes a first folded portion and a second folded portion having an included angle α, the first folded portion is attached to the second folded portion, and the included angle α is not greater than 90 °.

Preferably, the positive electrode tab and the negative electrode tab are respectively positioned at two ends of the electrical core shell in the length direction.

Preferably, the mounting chamber is filled with an electrolyte.

The utility model also provides a battery pack which comprises the soft package battery cell.

Preferably, the battery pack is a PHEV battery pack.

The utility model has the beneficial effects that: the pit is punched through the two cover plates to form the pit slot, and the two pit slots form the installation cavity to install the battery core pole group, so that the process operation is simple and easy to realize, the packaging is easy, and the production efficiency is improved. And the apron is made by the plastic-aluminum membrane, and two apron at least one angle departments of same position are equipped with the chamfer incision to make the aluminium lamination in the plastic-aluminum membrane expose, after the equipment soft-packaged electrical core, can be convenient for check out the insulation resistance of electric core casing, and then the high efficiency detects out bad product.

Set up electric core casing into the cuboid structure, and electric core casing's length L is less than or equal to 320mm, and width H satisfies with thickness T: h is not less than 25% L and not more than 35%, T is not less than 1% L and not more than 5% L, uniform distribution of current density of the battery cell can be guaranteed, heat generation caused by overlarge local current density can not be caused, limitation of thickness dimension of the battery cell shell is utilized, the characteristic of thinner thickness dimension can also be utilized, large-multiplying-power charge and discharge capacity of the battery cell is guaranteed, and power performance of the battery cell is guaranteed, so that influence of standard dimensions of the existing VDA platform and the MEB platform on power performance of the battery cell can be overcome, and performance of the battery cell is improved.

Drawings

Fig. 1 is a front view of a soft-packaged battery cell provided by the present invention;

fig. 2 is a side view of a soft-packaged electric core provided by the present invention;

fig. 3 is an enlarged schematic view at a of fig. 2 of the present invention.

In the figure:

1. a cover plate; 11. chamfering and cutting; 2. a positive electrode tab; 3. a negative electrode tab; 4. a first bending portion; 5. a second bending portion.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The utility model provides a battery pack, which comprises a soft package battery core, wherein the battery pack can be a PHEV battery pack or other battery packs. The battery pack disclosed by the utility model can ensure the high-rate charge and discharge capacity of the soft-packaged battery cell, ensure the power performance of the soft-packaged battery cell, and also can improve the safety performance of the soft-packaged battery cell in the battery pack, so that the battery pack has good practicability.

As shown in fig. 1 and 2, the soft-packaged battery cell of the present invention includes a battery cell casing, a battery cell electrode group and a battery cell tab, wherein the battery cell electrode group is disposed in the battery cell casing, the battery cell tab includes a positive electrode tab 2 and a negative electrode tab 3, one end of the positive electrode tab 2 and one end of the negative electrode tab 3 are located outside the battery cell casing, and the other end is connected to the battery cell electrode group.

In this embodiment, the battery cell casing includes two cover plates 1 which are mutually buckled and hermetically connected, the two cover plates 1 are all formed with pit grooves through pit flushing, the two pit grooves jointly form an installation cavity, and the installation cavity is used for placing the battery cell pole group and filling electrolyte. This embodiment is punched the hole through two apron 1 and is formed the pot hole, forms the installation cavity in order to install electric core utmost point group by two pot holes for the simple easy realization of technology operation encapsulates easily moreover, and then improves production efficiency.

Above-mentioned apron 1 is made by the plastic-aluminum membrane, and two 1 at least one angle departments of 1 same position of apron are equipped with chamfer incision 11 (this embodiment all sets up chamfer incision 11 in four angle departments), so that the aluminium lamination in the plastic-aluminum membrane exposes, after the soft packet of electricity core of equipment, in order to guarantee that the aluminium lamination in the plastic-aluminum membrane can not expose and contact electrolyte, need detect the insulation resistance of the cell casing of soft packet of electricity core, usually, measure insulation resistance through the aluminium lamination of check out test set contact plastic-aluminum membrane, current cell casing is because the encapsulation reason, the existence leads to the aluminium lamination not to expose the condition because of the heat-seal, and then cause the unable aluminium lamination of contact of check out test set, lead to the unable accurate detection of check out defective products of check out test set. This embodiment is equipped with chamfer incision 11 through at least one angle department at two apron 1 same positions, makes the aluminium lamination in the plastic-aluminum membrane expose, can ensure the check out test set contact aluminium lamination, and then ensures that check out test set's detection is accurate, just also can ensure that the detection of bad product is more accurate, reaches the high efficiency and detects out the purpose of bad product.

Preferably, two ends of the cell casing in the width direction of the embodiment are respectively folded, and the folded edge of at least one end is a double-folded structure, as shown in fig. 3, the double-folded structure includes a first folded portion 4 and a second folded portion 5 having an included angle α, wherein the first folded portion 4 is attached to the second folded portion 5, and the included angle α of the second folded portion 5 is not greater than 90 °. By adopting the double-folded structure, the sealing width of the soft-package battery cell can be ensured, and the sealing strength of the soft-package battery cell can be further ensured, so that the possibility that the battery cell shell is broken due to gas production can be reduced, and the safety of the soft-package battery cell is ensured. The sizes of the first bending part 4 and the second bending part 5, the included angle α, and the like are all selected according to the overall design of the soft package battery cell. Of course, in addition to the two opposite ends both adopting double-folded edges, the embodiment may also adopt a folded edge structure that one end adopts double-folded edges and the other end still adopts a single-folded edge. In this embodiment, it is preferable that the distance from the vertex angle of the included angle α formed by the second bent portion 5 to the side wall of the cover plate 1 is set to 1mm to 1.5 mm.

In this embodiment, when the above-mentioned double-folded structure is folded, the folding tool can first fold the first folded portion 4, so that the first folded portion 4 is attached to the second folded portion 5, and then the second folded portion 5 attached with the first folded portion 4 is folded according to the set degree of the included angle α.

In this embodiment, the above-mentioned electric core casing sets up to the cuboid structure, and the length L of electric core casing is less than or equal to 320mm, and width H and thickness T satisfy: h is not less than 25% L and is not more than 35%, T is not less than 1% L and is not more than 5% L, can guarantee electric core current density evenly distributed, can not lead to local current density too big and heat production, utilize the injecing of electric core casing thickness size, also can utilize the thinner characteristics of thickness size, guarantee the big multiplying power charge-discharge ability of soft-packaged electric core, guarantee the power performance of soft-packaged electric core, thereby can overcome the influence that adopts current VDA platform and MEB platform standard dimension to soft-packaged electric core power performance to cause from this, in order to promote soft-packaged electric core performance.

In this embodiment, above-mentioned anodal utmost point ear 2 one end is located outside apron 1, and the other end wears to locate between the first end of two apron 1 homonymies and connects in electric core polar group, and in the same way, 3 one ends of negative pole utmost point ear are located outside apron 1, and the other end wears to locate between the second end of two apron 1 homonymies and connects in electric core polar group. The first end and the second end of the cover plate 1 are disposed to face each other, and preferably, both ends of the cover plate 1 in the longitudinal direction, that is, the positive electrode tab 2 and the negative electrode tab 3 are respectively located at both ends of the core housing in the longitudinal direction.

Preferably, the widths W of the cathode tab 2 and the anode tab 3 satisfy: w is more than or equal to 10 percent and less than or equal to 20 percent, and the thickness of the positive electrode lug 2 and the negative electrode lug 3 is 0.3mm-0.4 mm. Through the setting to electric core utmost point ear width and thickness, compare in current utmost point ear size, this embodiment can be through the width and the thickness size of increase anodal utmost point ear 2 and negative pole utmost point ear 3, and then guarantee that electric core utmost point ear has sufficient overcurrent capacity to promote soft-packaged electric core wholeness ability.

In this embodiment, the battery cell electrode group may be a laminated single-electrode group, and the battery cell electrode group is formed by stacking a positive plate and a negative plate through a Z-type lamination process. Adopt the monopole group through the electric core utmost point group among the soft-packaged electric core to make it pass through the shaping of lamination technology, cooperate anodal utmost point ear 2 and negative pole utmost point ear 3 again from this and stretch out by the both ends of electric core shell, be favorable to the heat dissipation of soft-packaged electric core, make its temperature rise littleer, the cycling performance is excellent, simultaneously, the temperature distribution and the current distribution of soft-packaged electric core also can be better, and are more favorable to the security and the reliability of soft-packaged electric core. It should be noted that, a diaphragm is arranged between the positive plate and the negative plate, when the battery is assembled, the diaphragm is in a zigzag structure, the positive plate and the negative plate are isolated by the diaphragm, and finally the battery is laminated into a required battery pole group.

Preferably, the positive plate is made of a lithium iron phosphate material, the multiplying power performance is optimized, and meanwhile, the safety is considered, the thickness is small, so that the heat dissipation of the soft-package battery cell is quicker, the thermal runaway risk is small, and the safety is improved. The cathode plate can adopt the existing commonly used cathode materials, such as graphite cathodes and the like.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the utility model. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides a soft packet of electricity core which characterized in that includes:

the battery cell comprises a battery cell shell, wherein the battery cell shell comprises two cover plates (1) which are buckled with each other and are in sealed connection, pit grooves are formed in the two cover plates (1) through pit punching, an installation cavity is formed by the two pit grooves together, the cover plates (1) are made of aluminum-plastic films, and at least one corner of the same position of the two cover plates (1) is provided with a chamfer notch (11) so that an aluminum layer in the aluminum-plastic films is exposed;

the battery cell pole group is arranged in the installation cavity;

electric core utmost point ear, including anodal utmost point ear (2) and negative pole utmost point ear (3), anodal utmost point ear (2) one end is located outside apron (1), the other end is worn to locate two just connect in between the first end of apron (1) homonymy in electric core utmost point organizes, negative pole utmost point ear (3) one end is located outside apron (1), the other end is worn to locate two just connect in between the second of apron (1) homonymy is held in electric core utmost point organizes.

2. The soft-packaged electrical core of claim 1, wherein the electrical core shell is of a cuboid structure, the length L of the electrical core shell is less than or equal to 320mm, and the width H and the thickness T satisfy the following conditions: h is more than or equal to 25 percent and less than or equal to 35 percent, and T is more than or equal to 1 percent and less than or equal to 5 percent.

3. The soft-packaged cell according to claim 2, wherein the widths W of the positive electrode tab (2) and the negative electrode tab (3) satisfy: w is more than or equal to 10% and less than or equal to 20% L, and the thicknesses of the positive electrode lug (2) and the negative electrode lug (3) are 0.3mm-0.4 mm.

4. The flexible packaging battery cell according to claim 1, wherein the battery cell pole group is a laminated single-pole group, and the battery cell pole group is formed by stacking a positive plate and a negative plate through a Z-shaped lamination process.

5. The soft-package battery cell according to claim 4, wherein the positive plate is made of lithium iron phosphate material.

6. The soft-package battery cell according to claim 1, wherein the two ends of the cell casing in the width direction are respectively folded, and the folded edge of at least one end is a double-folded structure, the double-folded structure comprises a first folded portion (4) and a second folded portion (5) having an included angle α, the first folded portion (4) is attached to the second folded portion (5), and the included angle α is not greater than 90 °.

7. The soft-package battery cell according to claim 1, wherein the positive electrode tab (2) and the negative electrode tab (3) are respectively located at two ends of the battery cell shell in the length direction.

8. The flexible package battery cell according to claim 1, wherein the mounting chamber is filled with an electrolyte.

9. A battery pack, comprising the laminate core according to any one of claims 1 to 8.

10. The battery pack of claim 9, wherein the battery pack is a PHEV battery pack.