CN218867190U - Battery cell, battery pack and vehicle - Google Patents

Abstract

The present disclosure relates to the field of battery technologies, and in particular, to an electrical core, a battery pack, and a vehicle. Wherein, electric core, including casing and stack unit, the quantity of stack unit is two sets of at least, two sets of stack units at least are parallel to each other set up in the casing, and the utmost point ear unit of adjacent two sets of stack units is towards opposite direction, and utmost point ear unit includes anodal utmost point ear and negative pole utmost point ear, and anodal utmost point ear and negative pole utmost point ear locate stack unit with one side, and the position department that corresponds with anodal utmost point ear and negative pole utmost point ear on the casing sets up anodal utmost point post and negative pole utmost point post respectively, and anodal utmost point post is connected with anodal utmost point ear, and negative pole utmost point post is connected with negative pole utmost point ear. The electric core provided by the embodiment of the disclosure has at least two positive pole posts and two negative pole posts, and through increasing the posts of the electric core, under the same discharge multiplying power, the tab current load of the electric core is reduced, the temperature rise speed of the electric core is reduced, and the probability of out-of-control heating of the electric core is reduced.

Description

Battery cell, battery pack and vehicle

Technical Field

The present disclosure relates to the field of battery technologies, and in particular, to an electrical core, a battery pack, and a vehicle.

Background

In the present lithium cell production process, the equipment electricity core equipment is assembled to soft packet of lithium cell generally adoption. In the existing laminating machine, a diaphragm, a positive plate and a negative plate are conveyed to a laminating table by a feeding mechanism for lamination, the diaphragm performs zigzag reciprocating motion in the production process, the positive plate and the negative plate are stacked together in a certain stacking sequence, and finally, an adhesive tape is used for fixing at an adhesive tape sticking mechanism to form a laminating body, wherein the quality of an electric core produced by the laminating process is generally higher than that of an electric core produced by a winding process.

The assembled battery cell generally has a positive pole column and a negative pole column only on one side, the polarization inside the battery cell is large, the battery cell cannot be charged and discharged with large multiplying power, and the temperature rise is high; one of the ways of improving the energy density of the battery cell is to increase the capacity of the single battery cell, the requirement for improving the overcurrent capacity of the corresponding top cover is higher, and because the number of the positive pole posts and the negative pole posts is less, the overcurrent of the pole lugs is very easy to cause, the temperature rise at the cover plate is higher, and the thermal runaway is caused.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem or at least partially solve the technical problem, the present disclosure provides a battery cell, a battery pack, and a vehicle.

The utility model provides an electric core, including casing and stack unit, the quantity of stack unit is two sets of at least, and is at least two sets of the mutual parallel arrangement of stack unit in the casing, and adjacent two sets of the utmost point ear unit of stack unit is towards opposite direction, utmost point ear unit includes anodal utmost point ear and negative pole utmost point ear, anodal utmost point ear with negative pole utmost point ear locates with one side of stack unit, on the casing with anodal utmost point ear with position department that negative pole utmost point ear corresponds sets up anodal utmost point post and negative pole utmost point post respectively, anodal utmost point post with anodal utmost point ear is connected, negative pole utmost point post with negative pole utmost point ear is connected.

Optionally, the casing includes at least two parallel and staggered shells, each shell has a first end and a second end that are opposite to each other, the first end of any one shell protrudes out of the second end of the other shell, and the end face of the first end of the shell is provided with the positive electrode post and the negative electrode post; at least two sets of laminate units one-to-one set at least two in the shell, just on the laminate unit positive pole utmost point ear with negative pole utmost point ear respectively with anodal utmost point post on the shell with negative pole utmost point post corresponds the setting.

Optionally, the shape of the housing is a cuboid, and the first end and the second end of the housing are respectively two ends of the housing along the length direction.

Optionally, two adjacent shells are attached to each other on the surfaces that are opposite to each other and are communicated with each other at the connection position.

Optionally, the positive pole column and the positive pole lug are welded and fixed, and the negative pole column and the negative pole lug are welded and fixed.

Optionally, a preformed hole is formed in the end face of the first end of the shell, and the preformed hole is formed in the positive electrode pole and between the negative electrode poles.

Optionally, a recess is formed between the end surface of the second end of the housing and the end surface of the first end of the other housing, and a heat dissipation device is arranged in the recess.

Optionally, each group of the laminate units includes a plurality of the laminates, and the plurality of laminates are arranged side by side.

The present disclosure also provides a battery pack including the battery core according to any one of the above embodiments.

The present disclosure also provides a vehicle including the battery pack as described above.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the embodiment of the disclosure provides a battery cell, including casing and stack unit, the quantity of stack unit is at least two sets of, at least two sets of stack unit parallel arrangement are in the casing, and the utmost point ear unit of adjacent two sets of stack units is towards opposite direction, one side of every stack unit of group all is equipped with anodal utmost point ear and negative pole utmost point ear, the position department that corresponds with anodal utmost point ear and negative pole utmost point ear on the casing sets up anodal utmost point post and negative pole utmost point post respectively, wherein anodal utmost point post is connected with anodal utmost point ear, negative pole utmost point post is connected with negative pole utmost point ear. The embodiment of the present disclosure provides an electric core, both ends at the casing all are equipped with anodal utmost point post and negative terminal post, that is to say that electric core has two at least anodal utmost point posts and two negative terminal posts, through the utmost point post that increases electric core, under the same multiplying power that discharges, the utmost point ear current load of this electric core reduces, has reduced the temperature rise speed of electric core, has reduced the probability that electric core heating out of control.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic diagram of a battery cell according to an embodiment of the disclosure;

fig. 2 is a schematic diagram of an internal structure of a battery cell according to an embodiment of the disclosure;

fig. 3 is a side view of a cell according to an embodiment of the disclosure;

FIG. 4 is a schematic structural diagram of a laminate according to an embodiment of the present disclosure;

FIG. 5 is a side view of a layer diagram according to an embodiment of the disclosure;

fig. 6 is a schematic structural diagram of a positive electrode tab according to an embodiment of the disclosure;

fig. 7 is a schematic structural diagram of a negative electrode tab according to an embodiment of the disclosure.

Wherein, 1, a shell; 11. a housing; 101. a first end; 102. a second end; 103. a positive pole column; 104. a negative electrode post; 105. reserving a hole; 106. recessing; 2. a laminate unit; 21. a diaphragm; 22. a positive electrode plate; 23. a negative pole piece; 201. a positive electrode tab; 202. a negative electrode tab; a1, a laminate; a2, a laminate; b1, a laminate; b2, a laminated body.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

As shown in fig. 1 to 3, an embodiment of the present disclosure provides an electrical core, including a casing 1 and two stacked units 2, the number of the stacked units 2 is at least two, at least two stacked units 2 are disposed inside the casing 1, and two adjacent stacked units 2 are disposed in parallel, in the embodiment of the present disclosure, two stacked units 2 are taken as an example for introduction, a tab unit is disposed on one side of each stacked unit 2, the tab unit includes a positive tab 201 and a negative tab 202, that is, the positive tab 201 and the negative tab 202 are disposed on one side of the stacked unit 2, the tab units of the two stacked units 2 are disposed in opposite directions, as shown in fig. 3, the tab unit of one stacked unit 2 is disposed toward the left side, the tab unit of the other stacked unit 2 is disposed toward the right side, a positive electrode post 103 is disposed on the casing 1 at a position corresponding to the positive tab 201, a negative electrode post 104 is disposed at a position corresponding to the negative electrode tab 202, the positive electrode post 103 is connected to the positive electrode tab 201, and the negative electrode post 104 is connected to the negative electrode tab 202. That is to say, electric core in this disclosed embodiment has two anodal utmost point posts 103 and two negative pole posts 104 on casing 1, the increase of utmost point post quantity for electric core is under the same multiplying power that discharges, and the discharge current that single utmost point post was shared reduces, has reduced the temperature rise speed of electric core, has reduced the probability that electric core heating out of control.

Further, referring to fig. 1 and fig. 2, in some embodiments of the present disclosure, the casing 1 includes two shells 11 that are parallel and staggered, each shell 11 has a first end 101 and a second end 102 that are opposite to each other, the first end 101 of any one shell 11 protrudes from the second end 102 of another shell 11, the end surfaces of the first ends 101 of the two shells 11 are respectively provided with a positive electrode post 103 and a negative electrode post 104, two sets of stacked body units 2 are respectively disposed in the two shells 11, and two sets of stacked body units 2 respectively include a positive electrode tab 201 and a negative electrode tab 202, which are respectively disposed corresponding to the positive electrode post 103 and the negative electrode post 104 on the corresponding shell 11. Specifically, the two sets of laminate units 2 are arranged in parallel and staggered, that is, the two sets of laminate units 2 are not in perfect alignment and are offset in the length direction. The laminated unit 2 is arranged in the housing 11 along the length direction of the housing 11, a set of laminated units 2 is arranged in one housing 11, the length of the housing 11 is matched with the length of the laminated body, that is, the laminated unit 2 is packaged by the housing 11, after the packaging is completed, the tab units of the laminated unit 2 are respectively arranged corresponding to the first end 101 of the housing 11, at the first end 101 of the housing 11, the positive electrode post 103 is connected with the positive electrode tab 201 on the laminated unit 2, and the negative electrode post 104 is connected with the negative electrode tab 202 on the laminated unit 2. Further, in some embodiments of the present disclosure, the casing 11 is shaped as a rectangular parallelepiped, the first end 101 and the second end 102 of the casing 11 are two ends of the casing 11 along the length direction, the stacked body unit 2 is encapsulated inside the casing 11 along the length direction of the casing 11, and the casing 11 is made of an aluminum shell, which facilitates heat dissipation.

It should be noted that the number of the housings 11 needs to be equal to the number of the laminate units 2, that is, the number of the housings 11 is at least two, and the laminate units 2 are disposed in the housings in a one-to-one correspondence manner, in the embodiment of the present disclosure, the number of the laminate units 2 is two as an example, and correspondingly, the number of the housings 11 is also two.

Further, in some embodiments of the present disclosure, the two shells 11 are disposed on opposite surfaces and are connected to each other at a joint, that is, the inside of the housing 1 is a communicating accommodating chamber. An opening may be formed in one side of the housing 11 from the second end 102 toward the first end 101, the opening is formed to a position close to the first end 101 but not to the first end 101, when the two housings 11 are butted, the first ends 101 of the two housings 11 face in opposite directions, and the openings of the two housings 11 are completely opposite, the two housings 11 may be fixed together by welding, or the two housings 11 may be formed by integral molding. So set up, form a sunken 106 between the terminal surface of the second end 102 of shell 11 and the terminal surface of the first end 101 of another shell 11, can be used for setting up heat abstractor in this sunken 106, strengthen radiating device for example fin or liquid cooling board etc. dispel the heat to electric core and cool down, promote the heavy current charge and discharge ability of electric core, guarantee that the temperature rise of electric core is at controllable level, promote the security performance of electric core.

Further, inside the case 1, the positive electrode terminal 103 on the case 1 and the positive electrode terminal 103 on the laminated unit 2 are welded and fixed, and the negative electrode terminal 104 and the negative electrode tab 202 are welded and fixed. Through the welded mode, be connected to utmost point post and utmost point ear together, can realize fixed effect, can realize the electricity again and connect.

Further in some embodiments of the present disclosure, a prepared hole 105 is provided on the end face of the first end 101 of the housing 11, the prepared hole 105 is suitable for installing an explosion-proof valve or being a liquid injection hole, and the specific prepared hole 105 is disposed between the positive electrode post 103 and the negative electrode post 104.

Further, in some embodiments of the present disclosure, each group of laminate units 2 includes a plurality of laminates, and the plurality of laminates are arranged side by side. Specifically, as shown in fig. 2, a set of stacked body units 2 is disposed in each housing 11, each set of stacked body units 2 includes two stacked bodies, i.e., a stacked body A1, a stacked body A2, a stacked body B1, and a stacked body B2, where the stacked body A1 and the stacked body A2 are a set of stacked body units 2 disposed in one housing 11, and the stacked body B1 and the stacked body B2 are a set of stacked body units 2 disposed in the other housing 11. The laminated body A1 and the laminated body A2 are in a parallel structure and are respectively connected with the negative pole post 104 and the positive pole post 103 through welding and printing; the laminated body B1 and the laminated body B2 are in a parallel structure and are respectively connected with the negative electrode pole 104 and the positive electrode pole 103 through welding.

The laminated body A1/A2 and the laminated body B1/B2 do not interfere with each other and are not directly connected electrically; the electrochemical potentials of the laminated body A1/A2 and the laminated body B1/B2 are not necessarily the same, and the difference can be within 0.5V, so that the assembly is convenient, and the flexible charge and discharge are realized. For example, the negative electrode post 104 and the positive electrode post 103 of one housing 11 may be externally connected to a load for charging and discharging, while the negative electrode post 104 and the positive electrode post 103 of the other housing 11 are temporarily not charged or discharged.

Referring to fig. 4 and 5, the laminated structure includes a positive electrode sheet 22, a negative electrode sheet 23, and a separator 21, the separator 21 is arranged in a zigzag stacked manner, the positive electrode sheet 22 and the negative electrode sheet 23 are inserted between two adjacent layers of separators 21, that is, the separator 21, the negative electrode sheet 23, the separator 21, and the positive electrode sheet 22 are stacked in sequence, and the separator 21, the positive electrode sheet 22, and the negative electrode sheet 23 are fixed together by a fixing tape. The stack is rectangular overall, with the positive tab 201 on the top and the negative tab 202 on the bottom, and the positive tab 201 and the negative tab 202 on the same side of the stack. Each group of laminated body components comprises at least one laminated body, and when the two groups of laminated bodies are arranged in parallel, 4 tabs are formed to share charge and discharge current.

Further, referring to fig. 6 and 7, in some embodiments of the present disclosure, the positive electrode sheet 22 is rectangular, a positive electrode tab 201 is distributed on an upper side of an end portion of the positive electrode sheet 22, both front and back sides of the positive electrode sheet 22 are coated, and the positive electrode tab 201 is a plain foil, and an aluminum foil is generally used. The structure of the negative electrode plate 23 is similar to that of the positive electrode plate 22, specifically, the negative electrode plate 23 is rectangular, a negative electrode tab 202 is distributed on the lower side of the end of the negative electrode plate 23, the negative electrode tab 202 is made of smooth foil, generally copper foil, and the front and back sides of the negative electrode plate 23 are also provided with coatings.

Further, in some embodiments of the present disclosure, a battery pack is further provided, which includes the above battery cell, so that efficiency of thermal runaway of the battery pack is reduced, and safety of the battery pack is improved.

Furthermore, some embodiments of the present disclosure further provide a vehicle, including the above battery pack, avoid the hidden danger of the vehicle caused by the safety problem of the battery pack, and further improve the safety performance of the entire vehicle.

It is noted that, in this document, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

The previous description is only for the purpose of describing particular embodiments of the present disclosure, so as to enable those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides an electric core, its characterized in that, includes casing and stack unit, the quantity of stack unit is two sets of at least, and is at least two sets of the mutual parallel arrangement of stack unit in the casing, and adjacent two sets of the utmost point ear unit of stack unit is towards opposite direction, utmost point ear unit includes anodal utmost point ear and negative pole utmost point ear, anodal utmost point ear with negative pole utmost point ear locates with one side of stack unit, on the casing with anodal utmost point ear with the position department that negative pole utmost point ear corresponds sets up anodal utmost point post and negative pole utmost point post respectively, anodal utmost point post with anodal utmost point ear is connected, negative pole utmost point post with negative pole utmost point ear connects.

2. The battery cell of claim 1, wherein the casing includes at least two parallel shells arranged in a staggered manner, each shell has a first end and a second end arranged in an opposite manner, the first end of any one shell protrudes out of the second end of the other shell, and the positive electrode post and the negative electrode post are arranged on the end surface of the first end of each shell; at least two sets of the laminated units are arranged in at least two of the shells in a one-to-one correspondence mode, and the positive pole lugs and the negative pole lugs on the laminated units are respectively arranged in a corresponding mode with the positive pole posts and the negative pole posts on the shells.

3. The battery cell of claim 2, wherein the casing is shaped as a rectangular parallelepiped, and the first end and the second end of the casing are two ends of the casing along the length direction.

4. The electric core according to claim 3, wherein adjacent two of the shells are attached to each other on oppositely disposed surfaces and communicate with each other at a connection.

5. The electric core of claim 1, wherein the positive electrode post is welded and fixed to the positive electrode tab, and the negative electrode post is welded and fixed to the negative electrode tab.

6. The electric core according to claim 2, wherein a preformed hole is formed in an end face of the first end of the housing, and the preformed hole is formed between the positive electrode post and the negative electrode post.

7. The electric core of claim 2, wherein a recess is formed between an end surface of the second end of one of the shells and an end surface of the first end of the other of the shells, and a heat dissipation device is disposed in the recess.

8. The cell of any of claims 1 to 7, wherein each group of the laminate units comprises a plurality of the laminates, and the plurality of laminates are arranged side by side.

9. A battery pack comprising the electrical core of any of claims 1-8.

10. A vehicle characterized by comprising the battery pack according to claim 9.

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