CN219067164U - Battery and battery pack - Google Patents

Abstract

The utility model relates to the technical field of batteries, in particular to a battery and a battery pack. The battery includes: at least two pole groups, a first connecting sheet and a second connecting sheet, wherein the at least two pole groups are arranged along the length direction, and each pole group is provided with a first pole lug and a second pole lug; the first connecting piece is electrically connected with each first tab and is suitable for being connected with an external circuit; the second connecting piece is electrically connected with each second lug and is suitable for being connected with an external circuit so as to enable at least two pole groups to be connected in parallel. The battery comprises a plurality of electrode groups which are sequentially arranged along the length direction, the long electrode groups are designed into a mode that a plurality of sections of short electrode groups are sequentially connected, the capacity of the whole battery is unchanged, and meanwhile, due to the fact that the electrode groups are small in size, electrolyte soaking time in the battery production process is short, the pole pieces can be fully soaked in a short time, so that production efficiency is improved, stability of battery performance is guaranteed, and meanwhile heat dissipation capacity of the battery is improved.

Description

Battery and battery pack

Technical Field

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

Background

Currently, the main power of an electric automobile comes from the energy provided by a lithium ion battery, and in order to enable the electric automobile to obtain more endurance mileage, the energy density of the battery is always increased. The optimization of the battery structure is a method for obtaining higher energy density of the battery, and mainly comprises the light weight of structural components and the increase of the volume of single cells. Among them, the weight reduction of the structural member has a great difficulty, and thus, increasing the volume of the battery is a currently widely selected method for increasing the energy density of the battery. In terms of volume increase of the battery, there are increasing thickness or number of the electrode groups, and increasing length or width of the battery, but this makes it difficult to obtain sufficient infiltration of the electrode sheets of the battery in a short time after the electrolyte is injected in the manufacturing process, thus reducing production efficiency and affecting battery performance.

Disclosure of Invention

Therefore, the technical problem to be solved by the utility model is to overcome the defect that a large volume of battery electrolyte is difficult to infiltrate in the prior art, so as to provide a battery and a battery pack which can be fully infiltrated in a short time.

In order to solve the above problems, the present utility model provides a battery including: at least two pole groups arranged along the length direction, each pole group having a first pole lug and a second pole lug; the first connecting piece is electrically connected with each first tab and is suitable for being connected with an external circuit; and the second connecting sheet is electrically connected with each second lug and is suitable for being connected with an external circuit so as to enable at least two pole groups to be connected in parallel.

Optionally, the number of the electrode groups is two, the first electrode lugs of the two electrode groups are oppositely arranged, and the second electrode lugs of the two electrode groups are far away from each other; or, the number of the pole groups is three or more, and the first pole lug and the second pole lug of each pole group are arranged on two sides of the pole group along the length direction.

Optionally, the battery further comprises: the first pole is electrically connected with the first connecting sheet and is suitable for being connected with an external circuit; the second pole is arranged at intervals with the first pole, is electrically connected with the second connecting sheet and is suitable for being connected with an external circuit.

Optionally, the battery further comprises a housing, a first cover plate and a second cover plate are arranged on the housing, the first cover plate and the second cover plate are arranged at intervals, the first pole is arranged on the first cover plate, and the second pole is arranged on the second cover plate.

Optionally, the first connection piece includes a first tab connection portion and a first pole connection portion, the first tab connection portion is connected with each first tab, and the first pole connection portion is fixedly connected with the first tab connection portion and is suitable for being connected with the first pole; and/or the second connecting piece comprises a second lug connecting part and a second pole connecting part, wherein the second lug connecting part is connected with each second lug, and the second pole connecting part is fixedly connected with the second lug connecting part and is suitable for being connected with the second pole.

Optionally, the battery further comprises: and an insulating member disposed between the adjacent two pole groups to separate the two pole groups.

Optionally, the battery further comprises a fusing part, wherein the fusing part is arranged on the first connecting sheet and/or the second connecting sheet, and the fusing part is suitable for fusing when a large current passes through.

Optionally, the first tab is an anode tab, and the second tab is a cathode tab; or the first tab is a negative tab, and the second tab is a positive tab.

Optionally, the battery further comprises: and the explosion-proof valve is arranged on the shell and is suitable for being opened when the polar group is in thermal runaway.

The present utility model also provides a battery pack, comprising: the battery described above.

The utility model has the following advantages:

1. the battery comprises a plurality of electrode groups which are sequentially arranged along the length direction, the long electrode groups are designed into a mode that a plurality of sections of short electrode groups are sequentially connected, the capacity of the whole battery is unchanged, and meanwhile, due to the fact that the electrode groups are small in size, electrolyte soaking time in the battery production process is short, the pole pieces can be fully soaked in a short time, so that production efficiency is improved, stability of battery performance is guaranteed, and meanwhile heat dissipation capacity of the battery is improved.

2. The two electrode groups are connected in parallel, so that the first connecting piece is connected with the two first electrode lugs conveniently, the assembly is convenient, the time is saved, and the production efficiency is improved; or, through setting up the first utmost point ear and the second utmost point ear of every utmost point group and all setting up in the both sides of utmost point group along length direction, a plurality of utmost point groups are neatly arranged, are convenient for assemble.

3. Through setting up the insulating part between two adjacent polar groups, effectively prevent to take place the short circuit between the polar group to improve the security of battery.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic structure of a battery according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram showing the positional relationship of two pole groups according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram showing the connection relationship between two pole groups according to an embodiment of the present utility model;

fig. 4 shows a schematic structural view of a housing according to an embodiment of the present utility model.

Reference numerals illustrate:

10. a pole group; 11. a first tab; 12. a second lug; 21. a first connecting piece; 211. a first tab connection portion; 212. a first pole connection; 22. a second connecting piece; 221. a second lug connection; 222. a second post connecting portion; 23. a fusing part; 31. a first pole; 32. a second post; 40. a housing; 41. a first cover plate; 42. a second cover plate; 50. an insulating member; 60. an explosion-proof valve.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

As shown in fig. 1 to 4, the battery provided in this embodiment includes: at least two pole groups 10, a first connecting piece 21 and a second connecting piece 22, wherein the at least two pole groups 10 are arranged along the length direction, and each pole group 10 is provided with a first pole lug 11 and a second pole lug 12; the first connecting piece 21 is electrically connected with each first tab 11 and is suitable for being connected with an external circuit; the second connection piece 22 is electrically connected to each second tab 12 and is adapted to be connected to an external circuit, so as to connect at least two pole groups 10 in parallel. The longitudinal direction refers to the "longitudinal direction" indicated by an arrow in fig. 1.

The battery of this embodiment of application, through setting up the battery and including a plurality of polar groups 10 that arrange in proper order along length direction, design long polar group into the form that multistage short polar group connects gradually, when guaranteeing that whole battery capacity is unchangeable, because polar group 10 size is less, electrolyte infiltration time in the battery production process is shorter, the pole piece can obtain abundant infiltration in the short time to improved production efficiency, guaranteed battery performance's stability, also improved the heat dispersion of battery simultaneously.

In this embodiment, the number of the two electrode groups 10 is two, the first tabs 11 of the two electrode groups 10 are oppositely arranged, the second tabs 12 of the two electrode groups 10 are far away from each other, i.e. one tab of the same kind in the two electrode groups 10 is located at the middle position of the two electrode groups 10, the tab of the other polarity is located at two sides of the battery along the length direction, the first connecting sheet 21 is located between the two electrode groups 10, so that when the two electrode groups 10 are connected in parallel, the first connecting sheet 21 is connected with the two first tabs 11 conveniently, the assembly is convenient, the time is saved, the improvement of the production efficiency is facilitated, and meanwhile, the first tabs 11 are subjected to insulation protection treatment by using materials including but not limited to high-temperature insulation adhesive tapes, mylar films, insulation plastics and the like, so as to prevent short circuits between the electrode groups 10. It can be understood that, as an alternative embodiment, the number of the pole groups 10 may be three or more, the plurality of pole groups 10 are sequentially arranged along the length direction of the battery, the first pole lug 11 and the second pole lug 12 of each pole group 10 are respectively arranged at two sides of the pole group 10 along the length direction, the first pole lug 11 of each pole group 10 is connected together through the first connecting piece 21, the second pole lug 12 of each pole group 10 is connected together through the second connecting piece 22, so as to realize the parallel connection of the plurality of pole groups 10, and at this time, preferably, the pole lugs with the same polarity between two adjacent pole groups 10 are oppositely arranged, so that the connection of the pole lugs between the two adjacent pole groups 10 and the connecting piece is facilitated, the pole lugs with the non-adjacent polarity can also be connected together through the extending connecting piece, the parallel connection of the plurality of pole groups 10 is ensured, and the first pole lug 11 and the second pole lug 12 of each pole group 10 are respectively arranged at two sides of the pole group 10 along the length direction, and the plurality of pole groups 10 are orderly arranged, thereby facilitating the assembly. The longitudinal direction refers to the "longitudinal direction" indicated by an arrow in fig. 1.

Preferably, the first connecting piece 21 is welded with the first tab 11, the second connecting piece 22 is welded with the second tab 12, and the welding mode is firm in connection and good in stability.

In this embodiment, the first tab 11 is a positive tab, and the second tab 12 is a negative tab; alternatively, the first tab 11 is a negative tab, and the second tab 12 is a positive tab. Each electrode group 10 has one positive electrode tab and one negative electrode tab, and when the number of the electrode groups 10 is two, the positive electrode tabs of the two electrode groups 10 can be opposite, or the two negative electrode tabs can be opposite, and only the opposite of the two electrode tabs with the same polarity is required to be ensured.

In this embodiment, the battery further includes: the first pole 31 and the second pole 32, the first pole 31 is electrically connected with the first connecting piece 21 and is suitable for being connected with an external circuit, so that the connection between the first pole ear 11 and the outside is realized; the second pole 32 is spaced from the first pole 31, and the second pole 32 is electrically connected to the second connecting piece 22 and adapted to be connected to an external circuit, so as to connect the second tab 12 to the outside. When the first tab 11 is a positive tab and the second tab 12 is a negative tab, the first tab 31 is a positive tab and the second tab 32 is a negative tab; when the first tab 11 is a negative tab and the second tab 12 is a positive tab, the first tab 31 is a negative tab and the second tab 32 is a negative tab. Preferably, the first pole 31 is welded with the first connecting sheet 21, the second pole 32 is welded with the second connecting sheet 22, and the welding mode is reliable in connection, mature in technology and good in stability.

In this embodiment, the battery further includes a housing 40, a first cover plate 41 and a second cover plate 42 are disposed on the housing 40, the first cover plate 41 and the second cover plate 42 are disposed at intervals, the first pole 31 is disposed on the first cover plate 41, and the second pole 32 is disposed on the second cover plate 42, so that the first pole 31 and the second pole 32 are not electrically connected, and the first pole 31 and the second pole 32 are convenient to mount and fix. Preferably, the first cover plate 41 and the second cover plate 42 are arranged on two opposite surfaces on the shell 40, so that the first pole 31 and the second pole 32 are not contacted, and the connection of the first pole 31 and the first connecting sheet 21 and the connection of the second pole 32 and the second connecting sheet 22 can be operated on two opposite surfaces on the shell 40, so that mutual influence is avoided, and the quality of the battery is improved.

Preferably, the number of the pole groups 10 is two, and the first cover plate 41 and the second cover plate 42 are arranged on the shell 40 at positions corresponding to the positions between the two pole groups 10, so that the pole groups are convenient to connect with the pole lugs, symmetrical in structure and convenient to process.

In this embodiment, the first connection piece 21 includes a first tab connection portion 211 and a first post connection portion 212, where the first tab connection portion 211 is connected to each first tab 11 to connect the first tabs 11 of each of the pole groups 10, and the first post connection portion 212 is fixedly connected to the first tab connection portion 211 and adapted to be connected to the first post 31, so as to electrically connect each first tab 11 to the first post 31; the second connection piece 22 includes a second tab connection portion 221 and a second post connection portion 222, wherein the second tab connection portion 221 is connected with each second tab 12 to connect the second tabs 12 of each pole group 10, and the second post connection portion 222 is fixedly connected with the second tab connection portion 221 and adapted to be connected with the second post 32, thereby realizing connection of each second tab 12 with the second post 32.

Preferably, the first tab connection part 211 extends along the height direction of the pole group 10, the surface of the first tab connection part 211 extending out of the pole group 10 after being connected with the first tab 11 is connected with the first pole connection part 212, and the first pole connection part 212 is perpendicular to the first tab connection part 211 so as to be connected with the first cover plate 41; the second tab connection part 221 extends along the height direction of the pole group 10, the surface of the second tab connection part 221 extending out of the pole group 10 after being connected with the second tab 12 is connected with the second post connection part 222, and the second post connection part 222 is perpendicular to the second tab connection part 221 so as to be connected with the second cover plate 42. It should be noted that the first connection piece 21 and the second connection piece 22 are not in contact, so as to ensure parallel connection between the plurality of pole groups 10.

Further preferably, the first pole connection portion 212 is located above the pole group 10, and the second pole connection portion 222 is located below the pole group 10, so as to avoid the first connection piece 21 from contacting with the second connection piece 22, thereby improving safety. Wherein, the height direction refers to the "height direction" indicated by the arrow in fig. 3; upper refers to the direction along the arrow in fig. 3 where the "upper" is located; the following refers to the direction along the arrow in fig. 3 where the "lower" is located.

Preferably, when the number of the pole groups 10 is two, the first tab connection portion 211 is located between the two pole groups 10 and welded to the first tab 11, the first tab connection portion 211 extends upward in the height direction to be connected to the first pole connection portion 212, and the first pole connection portion 212 is welded to the first pole 31; the two sides of the battery along the length direction are respectively provided with a second lug connecting part 221 welded with the second lug 12, the second lug connecting part 221 extends downwards along the height direction and is connected with a second pole connecting part 222, the second pole connecting part 222 is longer in size so as to connect the two second lug connecting parts 221 and is welded with the second pole 32, of course, the second pole connecting part 222 can be divided into two sections, one second lug connecting part 221 is respectively connected with the second pole 32, and the connection between the second lug 12 and the second pole 32 can be realized.

In this embodiment, the battery further includes: an insulating member 50, the insulating member 50 being disposed between adjacent two pole groups 10 to separate the two pole groups 10. By providing the insulating member 50 between the adjacent two pole groups 10, the occurrence of a short circuit between the pole groups 10 is effectively prevented, thereby improving the safety of the battery. Alternatively, the insulator 50 is a high temperature insulating tape, mylar film, insulating plastic, or the like.

Preferably, the number of the pole groups 10 is two, an insulating member 50 is disposed between the two pole groups 10, two sides of the insulating member 50 along the length direction of the battery are respectively abutted against the two pole groups 10, two sides of the insulating member 50 along the height direction are respectively abutted against the first cover plate 41 and the second cover plate 42, and the pole groups 10 are further prevented from being shorted.

In this embodiment, the battery further includes a fusing part 23, and the fusing part 23 is disposed on the first and second connection pieces 21 and 22, and the fusing part 23 is adapted to fuse when a large current passes therethrough, thereby cutting off the circuit and preventing the battery from being damaged by the large current. It will be appreciated that, as an alternative embodiment, the fusing part 23 may be provided only on one of the first connecting piece 21 or the second connecting piece 22, and fusing at a high current may be achieved to cut off the circuit. Preferably, the fusing part 23 is arranged on the connecting sheet connected with the positive electrode lug, so that the fusing effect is good and the safety of the battery is high. It should be noted that, the fusing part 23 is a weak point designed on the positive electrode connecting piece, the cross-sectional area of the fusing part 23 is smaller than the cross-sectional areas of other positions on the connecting piece, the resistance is larger, the heating value is higher, when the battery is short-circuited, the fusing can occur due to overlarge overcurrent, the overcurrent capacity of the fusing part 23 is different according to different battery designs, and the overcurrent capacity is mainly changed according to the cross-sectional area difference of the fusing part 23.

In this embodiment, the battery further includes: the explosion-proof valve 60, the explosion-proof valve 60 is disposed on the housing 40, the explosion-proof valve 60 is suitable for being opened when the thermal runaway occurs in the pole group 10, so as to discharge the high-temperature smoke generated by the thermal runaway in the battery, thereby reducing the temperature and the air pressure in the battery, preventing the battery from further dangerous reactions such as fire, explosion and the like, and improving the safety of the battery.

Preferably, the explosion-proof valve 60 is disposed on a side of the case 40 where the cover plate is not disposed, so that the area of the explosion-proof valve 60 can be effectively increased to a certain extent, whereby the explosion-proof valve 60 can effectively discharge the internal air pressure when the thermal runaway of the battery occurs, thereby improving the thermal runaway of the battery. It will be appreciated that, as an alternative embodiment, the explosion-proof valve 60 may also be located on the face of the housing 40 where the cover plate is located, which is advantageous for designing and efficient production of the cover plate and the housing, and improving the working efficiency, wherein the cover plate refers to the first cover plate 41 or the second cover plate 42. Further preferably, the number of the explosion-proof valves 60 is two, and one explosion-proof valve 60 is respectively arranged on two side surfaces of two ends of the shell along the length direction, so that the explosion-proof valve 60 has good drainage effect and is beneficial to improving the safety of the battery.

In this embodiment, the opening direction of the housing 40 may be a pole side opening or a non-pole side opening, and after the pole group 10 is placed in the housing 40, the corresponding pole and the pole group 10 are welded, and after the end face of the housing 40 is welded to the housing body, the cover plate is welded to the housing 40.

The present utility model also provides a battery pack, comprising: the battery described above. The battery pack comprises a plurality of batteries which are connected in series and/or in parallel.

From the above description, it can be seen that the above-described embodiments of the present utility model achieve the following technical effects:

by arranging the single long battery into the multi-pole component section parallel connection mode, the infiltration effect of the battery is optimized, the efficiency of the battery manufacturing process is improved, the heat dissipation of the battery is improved, and the performances of the battery in the aspects of circulation and the like are improved.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims (10)

1. A battery, comprising:

at least two pole groups (10) arranged in a length direction, each pole group (10) having a first pole tab (11) and a second pole tab (12);

the first connecting piece (21) is electrically connected with each first tab (11) and is suitable for being connected with an external circuit;

and a second connection piece (22) electrically connected with each second lug (12) and suitable for being connected with an external circuit so as to enable at least two pole groups (10) to be connected in parallel.

2. The battery according to claim 1, characterized in that the number of the pole groups (10) is two, the first tabs (11) of the two pole groups (10) are arranged opposite to each other, and the second tabs (12) of the two pole groups (10) are distant from each other;

or, the number of the pole groups (10) is three or more, and the first pole lug (11) and the second pole lug (12) of each pole group (10) are arranged on two sides of the pole group (10) along the length direction.

3. The battery of claim 1, wherein the battery further comprises:

a first pole (31) electrically connected to the first connection piece (21) and adapted to be connected to an external circuit;

the second pole (32) is arranged at intervals with the first pole (31), and the second pole (32) is electrically connected with the second connecting sheet (22) and is suitable for being connected with an external circuit.

4. A battery according to claim 3, further comprising a housing (40), wherein a first cover plate (41) and a second cover plate (42) are provided on the housing (40), the first cover plate (41) and the second cover plate (42) are arranged at intervals, the first pole (31) is arranged on the first cover plate (41), and the second pole (32) is arranged on the second cover plate (42).

5. A battery according to claim 3, wherein the first connection tab (21) comprises a first tab connection portion (211) and a first tab connection portion (212), the first tab connection portion (211) being connected to each of the first tabs (11), the first tab connection portion (212) being fixedly connected to the first tab connection portion (211) and being adapted to be connected to the first tab (31);

and/or, the second connecting piece (22) comprises a second lug connecting portion (221) and a second pole connecting portion (222), the second lug connecting portion (221) is connected with each second lug (12), and the second pole connecting portion (222) is fixedly connected with the second lug connecting portion (221) and is suitable for being connected with the second pole (32).

6. The battery of claim 1, wherein the battery further comprises: -an insulator (50), said insulator (50) being arranged between two adjacent pole groups (10) to separate the two pole groups (10).

7. The battery according to claim 1, characterized in that the battery further comprises a fusing part (23), the fusing part (23) being provided on the first connecting piece (21) and/or the second connecting piece (22), the fusing part (23) being adapted to fuse when a large current passes.

8. The battery according to claim 1, wherein the first tab (11) is a positive tab and the second tab (12) is a negative tab; alternatively, the first tab (11) is a negative tab, and the second tab (12) is a positive tab.

9. The battery of claim 4, wherein the battery further comprises: -an explosion-proof valve (60), said explosion-proof valve (60) being provided on said housing (40), said explosion-proof valve (60) being adapted to open when thermal runaway of said pole group (10) occurs.

10. A battery pack, comprising: a battery as claimed in any one of claims 1 to 9.

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