CN114639926A - Battery and battery assembly method - Google Patents

Abstract

The invention relates to the technical field of batteries, and provides a battery and a battery assembly method. The battery comprises a battery cell unit and a battery shell, wherein the battery cell unit is arranged in the battery shell, and the battery cell unit comprises: the battery comprises a first battery cell, a second battery cell and a battery cover, wherein the first battery cell comprises a first battery cell body, a first positive electrode lug and a first negative electrode lug, and the first positive electrode lug and the first negative electrode lug extend out from one end of the first battery cell body along a first direction; the first battery cell and the second battery cell are arranged along a first direction, the second battery cell comprises a second battery cell body, a second positive electrode lug and a second negative electrode lug, and the second positive electrode lug and the second negative electrode lug extend out from one end of the second battery cell body along a second direction; the first positive electrode lug is electrically connected with the second positive electrode lug, the first negative electrode lug is electrically connected with the second negative electrode lug, and two electrode leading-out ends of the battery cell unit can be led out from the same side of the battery shell, so that the battery is convenient to assemble.

Description

Battery and battery assembly method

technical field

The present invention relates to the technical field of batteries, and in particular, to a battery and a method for assembling the battery.

Background technique

In the related art, a battery includes a battery case and a battery cell installed in the battery case. Due to the limitation of the molding process of the battery cell itself, it is difficult to form a battery cell with a larger capacity.

SUMMARY OF THE INVENTION

The present invention provides a battery and a method for assembling the battery to improve the performance of the battery.

According to a first aspect of the present invention, a battery is provided, including a cell unit and a battery case, the cell unit is arranged in the battery case, and the cell unit includes:

The first cell, the first cell includes a first cell body, a first positive electrode tab and a first negative electrode tab, and the first positive electrode tab and the first negative electrode tab are separated by the first cell body along the first direction. one end extends out;

The second cell, the first cell and the second cell are arranged along the first direction, the second cell includes a second cell body, a second positive electrode tab and a second negative electrode tab, the second positive electrode tab and the first The two negative electrode tabs extend from one end of the second cell body along the second direction;

The first positive electrode tab is electrically connected to the second positive electrode tab, the first negative electrode tab is electrically connected to the second negative electrode tab, and the first direction and the second direction are opposite directions.

The battery of the embodiment of the present invention includes a cell unit and a battery case, and the cell unit is arranged in the battery case. The cell unit includes a first cell and a second cell, so as to meet the capacity requirement of the battery, and for a battery with a larger capacity requirement, the forming difficulty of the cell can be reduced, thereby improving the performance of the battery. The first positive electrode tab and the first negative electrode tab of the first cell extend from one end of the first cell body along the first direction, and the second positive electrode tab and the second negative electrode tab of the second cell extend along the first direction. The second direction extends from one end of the second cell body, and the first positive electrode tab is electrically connected with the second positive electrode tab, and the first negative electrode tab is electrically connected with the second negative electrode tab, so as to realize the first The battery cell and the second battery cell are connected in parallel, and the two electrode lead-out ends of the battery cell unit can be led out from the same side of the battery case, so as to facilitate the assembly of the battery.

According to a second aspect of the present invention, a method for assembling a battery is provided, comprising:

connecting the first cell and the second cell in parallel;

The first battery cell and the second battery cell connected in parallel are enclosed in the battery casing, so that the first positive electrode tab and the first negative electrode tab of the first battery cell are separated from the first battery cell by the first battery cell along the first direction. One end of the core body extends out, the second positive electrode tab and the second negative electrode tab of the second cell extend from one end of the second cell body of the second cell along the second direction, and the first cell and the second battery core is enclosed in the battery casing along the first direction;

The first direction and the second direction are opposite directions.

The battery assembly method according to the embodiment of the present invention encloses the first battery cell and the second battery cell connected in parallel in the battery casing, so as to meet the capacity requirement of the battery, and for batteries with larger capacity requirements, the capacity of the battery cells can be reduced. Difficulty in molding, thereby improving the performance of the battery. The first positive electrode tab and the first negative electrode tab of the first cell extend from one end of the first cell body along the first direction, and the second positive electrode tab and the second negative electrode tab of the second cell extend along the first direction. The second direction extends from one end of the second cell body, and the first positive electrode tab is electrically connected with the second positive electrode tab, and the first negative electrode tab is electrically connected with the second negative electrode tab, so as to realize the first The battery cell and the second battery cell are connected in parallel, and the two electrode lead-out ends of the battery cell unit can be led out from the same side of the battery case, so as to facilitate the assembly of the battery.

Description of drawings

For a better understanding of the present disclosure, reference may be made to the embodiments shown in the following figures. Components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. Additionally, the relevant elements or components may be arranged differently as known in the art. Furthermore, in the drawings, the same reference numerals refer to the same or similar parts throughout the various figures. in:

1 is a schematic structural diagram of a battery from a perspective according to an exemplary embodiment;

2 is a schematic structural diagram of a battery from another perspective according to an exemplary embodiment;

3 is a schematic diagram of an exploded structure of a battery according to an exemplary embodiment;

4 is a schematic structural diagram of a battery according to another exemplary embodiment;

FIG. 5 is a schematic flowchart of a method for assembling a battery according to an exemplary embodiment.

The reference numerals are explained as follows:

10, the first cell; 11, the first cell body; 12, the first positive tab; 13, the first negative tab; 20, the second cell; 21, the second cell body; 22, the second Positive electrode tab; 23, second negative electrode tab; 30, pole assembly; 50, battery case; 51, depression; 511, convex structure; 52, first surface; 53, second surface; 54, first housing part; 55, second housing part; 56, flange structure.

Detailed ways

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, so it should be understood that various modifications may be made to the example embodiments without departing from the scope of the present disclosure. modifications and changes.

In the description of the present disclosure, unless otherwise explicitly specified and limited, the terms "first" and "second" are only used for the purpose of description, and cannot be construed as indicating or implying relative importance; the term "plurality" is a means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the/said" or "an" object is also intended to mean one of the possible plurality of such objects.

Unless otherwise specified or stated, the terms "connected", "fixed", etc. should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection, or a signal connection. Connection; "connection" can be directly connected or indirectly connected through an intermediary. For those skilled in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

Further, in the description of the present disclosure, it should be understood that the directional terms "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are from the angles shown in the drawings. described, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being connected "on", "under", or "inside" or "outside" another element(s), it can not only be directly connected "On", "under" or "inside", "outside" another element(s), or indirectly connected "on", "under" or "outside" another element(s) through intervening elements inside and outside".

An embodiment of the present invention provides a battery, please refer to FIG. 1 to FIG. 3 , the battery includes a cell unit and a battery case 50 , the cell unit is arranged in the battery case 50 , and the cell unit includes: a first battery Cell 10, the first cell 10 includes a first cell body 11, a first positive electrode tab 12 and a first negative electrode tab 13, the first positive electrode tab 12 and the first negative electrode tab 13 are separated by the first One end of the cell body 11 extends out; the second cell 20, the first cell 10 and the second cell 20 are arranged along the first direction, and the second cell 20 includes a second cell body 21, a second positive electrode The tab 22 and the second negative tab 23, the second positive tab 22 and the second negative tab 23 extend from one end of the second cell body 21 along the second direction; wherein the first positive tab 12 and the first The two positive electrode tabs 22 are electrically connected, the first negative electrode tab 13 is electrically connected with the second negative electrode tab 23 , and the first direction and the second direction are opposite directions.

A battery according to an embodiment of the present invention includes a cell unit and a battery case 50 , and the cell unit is disposed in the battery case 50 . The cell unit includes a first cell 10 and a second cell 20, so as to meet the capacity requirement of the battery, and for a battery with a larger capacity requirement, the forming difficulty of the cell can be reduced, thereby improving the performance of the battery. The first positive electrode tab 12 and the first negative electrode tab 13 of the first battery cell 10 extend from one end of the first battery cell body 11 along the first direction, and the second positive electrode tab 22 and the first negative electrode tab 13 of the second battery cell 20 The second negative electrode tab 23 extends from one end of the second cell body 21 along the second direction. By electrically connecting the first positive electrode tab 12 and the second positive electrode tab 22 , the first negative electrode tab 13 and the second The negative electrode tabs 23 are electrically connected, so as to realize the parallel connection of the first cell 10 and the second cell 20, and the two electrode terminals of the cell unit can be drawn out from the same side of the battery case 50, so as to facilitate the battery assembly.

It should be noted that a battery includes a cell and an electrolyte, and is the smallest unit capable of performing electrochemical reactions such as charge/discharge. The cell refers to a unit formed by winding or laminating a stack including a first electrode, a separator and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. Wherein, the polarities of the first electrode and the second electrode can be interchanged.

It should be noted that the second cell 20 and the first cell 10 are arranged along the first direction, that is, the second cell 20 and the first cell 10 can form a structure arranged left and right, thereby increasing the overall size of the cell unit In the process of forming the independent first cell 10 and the second cell 20, it is possible to avoid forming a cell with a large length, which can not only improve the forming efficiency, but also improve the accuracy after forming, so as to ensure the subsequent forming. The performance of the cell unit.

The first positive electrode tab 12 and the first negative electrode tab 13 extend from one end of the first cell body 11 along the first direction, and the second positive electrode tab 22 and the second negative electrode tab 23 extend from the second direction along the second direction. One end of the cell body 21 extends out, the first direction and the second direction are opposite directions, the first positive electrode tab 12 , the first negative electrode tab 13 , the second positive electrode tab 22 and the second negative electrode tab 23 are all non-all tab structures, but since the first positive tab 12 is electrically connected with the second positive tab 22, and the first negative tab 13 is electrically connected with the second negative tab 23, it can also be ensured that the tab has Sufficient overcurrent capacity to ensure the safety performance of the battery.

In one embodiment, the first positive electrode tabs 12 and the second positive electrode tabs 22 are arranged opposite to each other, and the first negative electrode tabs 13 and the second negative electrode tabs 23 are arranged opposite to each other, so that the first positive electrode tabs 12 and the second negative electrode tabs are arranged opposite to each other. The positive electrode tab 22 is connected, and the first negative electrode tab 13 is connected with the second negative electrode tab 23 .

The first positive electrode tab 12 and the second positive electrode tab 22 are disposed opposite to each other, the first positive electrode tab 12 is flattened, and the flattened first positive electrode tab 12 is projected at least partially along the flattened second positive electrode tab 22 . on the second positive tab 22 . The first negative electrode tab 13 and the second negative electrode tab 23 are disposed opposite to each other. When the first negative electrode tab 13 is flattened, the flattened first negative electrode tab 13 is projected at least partially along the flattened second negative electrode tab 23 . on the second negative electrode tab 23 .

The first positive electrode tab 12 and the second positive electrode tab 22 are arranged opposite to each other. It can be considered that the end of the first positive electrode tab 12 is directly opposite to the end of the second positive electrode tab 22. At this time, the first positive electrode tab 12 The end of the second positive electrode tab 22 and the end of the second positive electrode tab 22 can be arranged at intervals, and the first positive electrode tab 12 and the second positive electrode tab 22 are electrically connected through an adapter plate or a pole assembly, or, the first positive electrode tab 12 and the end of the second positive electrode tab 22 can be butted.

The first positive electrode tab 12 and the second positive electrode tab 22 are arranged opposite to each other, and it can be considered that the part of the first positive electrode tab 12 and the part of the second positive electrode tab 22 are overlapped, so that the first positive electrode tab 12 and the second positive electrode tab 12 are overlapped. The two positive tabs 22 are electrically connected.

Correspondingly, the first negative electrode tab 13 is disposed opposite to the second negative electrode tab 23 , and it can be considered that the end of the first negative electrode tab 13 is directly opposite to the end of the second negative electrode tab 23 . Alternatively, it can be considered that a portion of the first negative electrode tab 13 is overlapped with a portion of the second negative electrode tab 23 .

In one embodiment, as shown in FIG. 2 and FIG. 3 , the battery further includes: a pole assembly 30 , and the pole assembly 30 is disposed in the battery case 50 ; wherein the first positive electrode tab 12 and the second positive electrode tab 22 Both are electrically connected to the pole assembly 30, or, the first negative pole tab 13 and the second negative pole tab 23 are both electrically connected to the pole assembly 30, so that the pole assembly 30 can be used as an electrode lead-out end, while the other electrode The terminal may be formed by the battery case 50 or another pole assembly 30 .

In one embodiment, as shown in FIGS. 2 and 3 , there are two pole assemblies 30 , the first positive tab 12 and the second positive tab 22 are both electrically connected to one pole assembly 30 , and the first negative pole is electrically connected to one pole assembly 30 . Both the lug 13 and the second negative electrode lug 23 are electrically connected to another pole assembly 30 , so that the two pole assemblies 30 can be used as two electrode lead-out ends of the battery respectively.

In some embodiments, the two pole assemblies 30 are located on the same side of the battery housing 50 .

In some embodiments, the two pole assemblies 30 may be located on opposite sides of the battery housing 50 .

In one embodiment, the battery case 50 includes a steel case, the first negative electrode tab 13 and the second negative electrode tab 23 are both electrically connected to the steel case, and the first positive electrode tab 12 and the second positive electrode tab 22 are both connected to the steel case. The column assembly 30 is electrically connected, so that the battery case 50 and the electrode column assembly 30 can be respectively used as two electrode lead-out ends of the battery, which not only has a simple structure, but also can reduce the weight of the battery. The corrosion potential of the steel case is high, so the electrical connection of the first negative electrode tab 13 and the second negative electrode tab 23 to the steel case can avoid a large amount of corrosion on the steel case and further improve the safety performance of the battery.

In one embodiment, the battery case 50 includes an aluminum case, the first positive electrode tab 12 and the second positive electrode tab 22 are both electrically connected to the aluminum case, and the first negative electrode tab 13 and the second negative electrode tab 23 are both connected to the aluminum case. The column assembly 30 is electrically connected, so that the battery case 50 and the electrode column assembly 30 can be respectively used as two electrode lead-out ends of the battery, which not only has a simple structure, but also can reduce the weight of the battery. The corrosion potential of the aluminum case is low, so the electrical connection of the first positive electrode tab 12 and the second positive electrode tab 22 to the aluminum case can avoid a large amount of corrosion on the aluminum case and further improve the safety performance of the battery.

In one embodiment, the battery case 50 is provided with a recess 51, and the recess 51 can be used to receive a pole assembly of another battery, so that when the batteries are grouped, the recess 51 allows the pole assembly of another battery to be released. position, so as to avoid collision with the pole assembly, thereby improving the space utilization rate when the batteries are grouped.

In one embodiment, the pole assembly 30 is located outside the range of the depression 51 , that is, the pole assembly 30 is not disposed in the depression 51 , and the pole assembly 30 may be disposed protruding from the battery case 50 . As shown in FIG. 2 , this When the batteries are grouped, the protruding pole assembly 30 can be received in the recess of another battery.

In one embodiment, as shown in FIG. 1 and FIG. 2 , the recess 51 is provided on the side of the battery case 50 away from the pole assembly 30 , so that the recess 51 can reliably accommodate the pole assembly of another battery, In addition, the connection between subsequent adjacent batteries can be facilitated, thereby improving the space utilization rate when the batteries are grouped.

In one embodiment, the orthographic projection of the depression 51 on the surface of the battery case 50 on which the pole assembly 30 is disposed at least partially coincides with the pole assembly 30 , that is, the depression 51 and the pole assembly 30 are perpendicular to the battery casing 50 The projections on one surface of the battery are at least partially overlapped, so that when the batteries are grouped, the two batteries can be aligned with each other, and it can ensure that the pole assembly of the other battery can be reliably accommodated in the recess 51, while ensuring the consistency of battery processing. properties for ease of processing.

It should be noted that, the specific structure of the above-mentioned recess 51 may not be limited, as long as it can accommodate the pole assembly of another battery.

In one embodiment, as shown in FIG. 4 , the battery case 50 is provided with a recess 51 , and the pole assembly 30 is located in the recess 51 , so that the protrusion of the pole assembly 30 from the battery case 50 can be avoided or reduced. Avoiding pole assemblies between adjacent cells will affect the space utilization of the battery pack.

In one embodiment, the battery case 50 is provided with a recess 51, and the recess 51 is used to connect with the battery case, so that when the batteries are assembled, the battery case 50 is connected to the battery case through the recess 51, so as to Improve battery installation stability.

It should be noted that the cell unit is composed of the first cell 10 and the second cell 20 , and the aforementioned recess 51 may be located in the middle of the battery case 50 . The recess 51 for receiving the pole assembly of another battery, the recess 51 for arranging the pole assembly 30 of the battery, and the recess 51 for connecting with the battery case, the arrangement position and specific structural form of the above-mentioned recess They may not be consistent. In some embodiments, it is not excluded that the arrangement positions and specific structural forms of the above-mentioned recesses may be consistent, which is not limited here, as long as the usage requirements are met.

In one embodiment, the opposite ends of the recess 51 penetrate through the opposite sides of the battery case 50 , which not only has a simple structure and is convenient for molding, but also facilitates the subsequent formation of cooperation with other structures.

Combined with the recess 51 shown in FIG. 3 , the recess 51 can be used for accommodating a pole assembly of another battery, and when the recess 51 is formed by punching, a protruding structure 511 will be formed inside.

In one embodiment, as shown in FIGS. 1 and 2 , the battery case 50 includes two opposing first surfaces 52 and four second surfaces 53 disposed around the first surfaces 52 , the first surfaces 52 having an area greater than The area of the second surface 53; wherein, the pole assembly 30 is disposed on the first surface 52, so as to ensure that the pole assembly 30 has a reliable support surface, thereby ensuring the stability of the pole assembly 30.

It should be noted that the two opposite first surfaces 52 are large surfaces of the battery case 50 , and the four second surfaces 53 are small surfaces of the battery case 50 , and the four second surfaces 53 include two pairs of small surfaces, That is, the first pair of small surfaces extending along the length direction of the battery case 50 and the second pair of small surfaces extending along the width direction of the battery case 50, and the area of the first pair of small surfaces is larger than the area of the second pair of small surfaces. area, but are smaller than the area of the large surface.

In one embodiment, there are two pole assemblies 30 , the first positive tab 12 and the second positive tab 22 are both electrically connected to one pole assembly 30 , the first negative tab 13 and the second negative tab 23 Both are electrically connected to another pole assembly 30, so that the two pole assemblies 30 can be respectively used as two electrode lead-out ends of the battery.

In one embodiment, as shown in FIG. 1 , the two pole assemblies 30 are disposed on the same first surface 52 , which not only facilitates installation, but also improves assembly efficiency and ensures that the pole assemblies 30 have a reliable supporting surface. , so as to ensure the stability of the pole assembly 30 .

The pole assembly 30 is located in the middle of the first surface 52 , so as to avoid the problem that the pole assembly 30 is disposed at the end, resulting in a long electrical connection path between the batteries.

In some embodiments, it is not excluded that the two pole assemblies 30 are respectively disposed on the two first surfaces 52 .

In some embodiments, the battery case 50 is provided with a recess 51, and the recess 51 can be used to receive a pole assembly of another battery. In this case, a first surface 52 of the battery case 50 may be provided with a pole assembly 30 , and a depression 51 may be provided on the other first surface 52 of the battery case 50 .

In some embodiments, the battery case 50 is provided with a recess 51 , and the pole assembly 30 is located in the recess 51 , that is, a first surface 52 of the battery case 50 is provided with both the recess 51 and the pole assembly 30 .

In some embodiments, the battery case 50 is provided with a recess 51 , and the recess 51 is used for connecting with the battery case. In this case, the recess 51 may be provided on a second surface 53 of the battery case 50 . Of course, it is not excluded that the recess 51 may be provided on one of the first surfaces 52 of the battery case 50 .

In one embodiment, as shown in FIG. 3 , the battery case 50 includes: a first case part 54 ; a second case part 55 , and the second case part 55 is connected with the first case part 54 to close the Cell unit. The first housing part 54 and the second housing part 55 are arranged independently, which can facilitate the installation of the cell unit and facilitate the processing.

In some embodiments, the first housing member 54 and the second housing member 55 may both be formed with accommodating cavities. After the first housing member 54 and the second housing member 55 are butted together, the cell units are located in the two accommodating cavities. formed cavity.

In some embodiments, the first housing member 54 is a flat plate, the second housing member 55 is formed with an accommodating cavity, and the cell unit is located in the accommodating cavity.

In one embodiment, as shown in FIG. 1 , the peripheral edge of the battery case 50 is provided with a flange structure 56 that can be used for positioning of battery packs or for heat conduction. The first housing part 54 and the second housing part 55 can be welded so that the first housing part 54 and the second housing part 55 form a flange structure 56 . The flange structure 56 can be considered to be formed by welding the flange edge of the first housing part 54 and the flange edge of the second housing part 55 .

An embodiment of the present invention also provides a battery assembly method, please refer to FIG. 5 , the battery assembly method includes:

S101, connecting the first cell 10 and the second cell 20 in parallel;

S103 , the first battery cell 10 and the second battery cell 20 connected in parallel are enclosed in the battery case 50 , so that the first positive electrode tab 12 and the first negative electrode tab 13 of the first battery cell 10 are along the first direction Extending from one end of the first cell body 11 of the first cell 10 , the second positive electrode tab 22 and the second negative electrode tab 23 of the second cell 20 are extended from the second cell 20 along the second direction. One end of the two battery core bodies 21 extends out, and the first battery core 10 and the second battery core 20 are enclosed in the battery casing 50 along the first direction;

The first direction and the second direction are opposite directions.

The battery assembly method according to an embodiment of the present invention encloses the first battery cell 10 and the second battery cell 20 connected in parallel in the battery case 50, so as to meet the capacity requirement of the battery, and for batteries with larger capacity requirements The forming difficulty of the battery cell can be reduced, thereby improving the performance of the battery. The first positive electrode tab 12 and the first negative electrode tab 13 of the first battery cell 10 extend from one end of the first battery cell body 11 along the first direction, and the second positive electrode tab 22 and the first negative electrode tab 13 of the second battery cell 20 The second negative electrode tab 23 extends from one end of the second cell body 21 along the second direction. By electrically connecting the first positive electrode tab 12 and the second positive electrode tab 22 , the first negative electrode tab 13 and the second The negative electrode tabs 23 are electrically connected, so as to realize the parallel connection of the first cell 10 and the second cell 20, and the two electrode terminals of the cell unit can be drawn out from the same side of the battery case 50, so as to facilitate the battery assembly.

In one embodiment, connecting the first cell 10 and the second cell 20 in parallel includes: arranging the first cell 10 and the second cell 20 along a first direction, and making the first positive tab 12 and The first negative electrode tabs 13 are respectively arranged opposite to the second positive electrode tabs 22 and the second negative electrode tabs 23; the first positive electrode tabs 12 and the second positive electrode tabs 22 are electrically connected, and the first negative electrode tabs 13 and the second The negative electrode tabs 23 are electrically connected, so as to realize the parallel connection of the first battery cell 10 and the second battery cell 20, so as to facilitate the subsequent extraction of the two electrode terminals of the battery.

In one implementation, enclosing the first battery cell 10 and the second battery cell 20 connected in parallel in the battery case 50 includes: connecting the first battery cell 10 and the second battery cell 20 in parallel on the first case member 54 of the battery case 50 . The second battery cell 20 ; the second housing part 55 of the battery housing 50 is sealedly connected to the first housing part 54 . The first housing member 54 can be used as a support structure during the connection process of the first cell 10 and the second cell 20 , so as to facilitate the connection of the first cell 10 and the second cell 20 .

In one embodiment, the method for assembling a battery further includes: before enclosing the first battery cell 10 and the second battery cell 20 connected in parallel in the battery case 50 , assembling the first positive electrode tab 12 with the second positive electrode The lugs 22 are connected to the pole assembly 30 of the battery case 50, that is, the first positive pole lugs 12 and the second positive pole lugs 22 are connected to the pole assembly 30 of the first casing member 54, so that the welding mechanism can be Welding is performed on the side where the first positive electrode tab 12 and the second positive electrode tab 22 are located, relative to the welding on the side where the pole assembly 30 is located, it is possible to avoid excessive welding energy and cause damage to the pole assembly 30 , and also facilitates welding.

Specifically, the first battery cell 10 and the second battery core 20 are placed on the first housing member 54 , the first positive electrode tab 12 and the second positive electrode tab 22 are welded relative to each other, and the pole assembly 30 is welded. The connection is followed by connecting the second housing part 55 to the first housing part 54 .

In one embodiment, the method for assembling a battery further includes: before enclosing the first battery cell 10 and the second battery cell 20 connected in parallel in the battery case 50 , assembling the first negative electrode tab 13 with the second negative electrode The lugs 23 are connected to the pole assembly 30 of the battery case 50 .

In one embodiment, when the first positive electrode tab 12 and the second positive electrode tab 22 are connected to the pole assembly 30 of the battery case 50 , the first negative electrode tab 13 and the second negative electrode tab 23 are electrically connected In the battery case 50; or, when the first negative electrode tab 13 and the second negative electrode tab 23 are connected to the pole assembly 30 of the battery case 50, the first positive electrode tab 12 and the second positive electrode tab 22 It is electrically connected to the battery case 50, so that the battery case 50 and the pole assembly 30 can be respectively used as two electrode lead-out ends of the battery.

In one embodiment, the first positive electrode tab 12 and the second positive electrode tab 22 are connected to one pole assembly 30, and the first negative electrode tab 13 and the second negative electrode tab 23 are connected to another pole assembly 30, the two pole assemblies 30 are located on the same large surface of the battery case 50, which is not only easy to install, but also can improve assembly efficiency, and can ensure that the pole assembly 30 has a reliable support surface, so as to ensure the pole assembly 30 stability.

Specifically, the first battery cell 10 and the second battery core 20 are placed on the first housing member 54 , the first positive electrode tab 12 and the second positive electrode tab 22 are welded relative to each other, and the pole assembly 30 is welded. For connection, the first negative electrode tab 13 and the second negative electrode tab 23 are welded relative to each other, and are welded and connected with the pole assembly 30 , and then the second housing member 55 is connected with the first housing member 54 . The first positive electrode tab 12 and the second positive electrode tab 22 are connected to one pole assembly 30, and the first negative electrode tab 13 and the second negative electrode tab 23 are connected to another pole assembly 30. The order is not limited. order.

In one embodiment, the first negative electrode tab 13 and the second negative electrode tab 23 are ultrasonically welded first, the first positive electrode tab 12 and the second positive electrode tab 22 are ultrasonically welded, and then connected to the pole assembly 30 by laser welding, Not only can the welding quality of the first negative electrode tab 13 and the second negative electrode tab 23 be ensured, but also the welding of the first negative electrode tab 13 and the second negative electrode tab 23 and the pole assembly 30 after welding can be avoided due to excessive energy. And the problem of damaging the first negative electrode tab 13 and the second negative electrode tab 23, correspondingly, ultrasonic welding the first positive electrode tab 12 and the second positive electrode tab 22 can not only ensure the first positive electrode tab 12 and the second positive electrode The welding quality of the tabs 22 can prevent the welding of the first positive tab 12 and the second positive tab 22 and the pole assembly 30 from damaging the first positive tab 12 and the second positive electrode due to excessive energy. ear 22. Ultrasonic welding can be considered as pre-welding, and laser welding can ensure reliable welding of the tabs and the pole assembly 30 .

In one embodiment, the battery assembly method is used to form the above-mentioned battery. For the specific structure of the battery in this embodiment, reference may be made to the specific structure of the above-mentioned battery, which will not be repeated here.

An embodiment of the present invention also provides a battery pack, including the above-mentioned battery.

A battery pack according to an embodiment of the present invention includes a battery, the battery includes a cell unit and a battery case 50 , and the cell unit is disposed in the battery case 50 . The cell unit includes a first cell 10 and a second cell 20, so as to meet the capacity requirement of the battery, and for a battery with a larger capacity requirement, the forming difficulty of the cell can be reduced, thereby improving the performance of the battery. The first positive electrode tab 12 and the first negative electrode tab 13 of the first battery cell 10 extend from one end of the first battery cell body 11 along the first direction, and the second positive electrode tab 22 and the first negative electrode tab 13 of the second battery cell 20 The second negative electrode tab 23 extends from one end of the second cell body 21 along the second direction. By electrically connecting the first positive electrode tab 12 and the second positive electrode tab 22 , the first negative electrode tab 13 and the second The negative electrode tabs 23 are electrically connected, so as to realize the parallel connection of the first cell 10 and the second cell 20, and the two electrode terminals of the cell unit can be drawn out from the same side of the battery case 50, so as to facilitate the battery assembly.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery module may further include an end plate and a side plate, and the end plate and the side plate are used for fixing the plurality of batteries.

It should be noted that a plurality of batteries can be formed into a battery module and then arranged in the battery box, and the plurality of batteries can be fixed by the end plates and the side plates. Multiple batteries can be directly arranged in the battery box, that is, there is no need to group multiple batteries, and in this case, the end plate and the side plate can be removed.

Other embodiments of the present disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the inventions disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of this disclosure and include common knowledge or techniques in the technical field not disclosed by this disclosure . The specification and example embodiments are to be regarded as exemplary only, with the true scope and spirit of the disclosure being indicated by the appended claims.

It is to be understood that the present disclosure is not limited to the precise structures described above and illustrated in the accompanying drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of protection of the present disclosure is limited only by the appended claims.

Claims (14)

1. A battery, characterized in that it comprises a cell unit and a battery case (50), the cell unit is arranged in the battery case (50), and the cell unit comprises: A first cell (10), the first cell (10) comprising a first cell body (11), a first positive electrode tab (12) and a first negative electrode tab (13), the first positive electrode The tabs (12) and the first negative tabs (13) are extended from one end of the first cell body (11) along the first direction; A second cell (20), the first cell (10) and the second cell (20) are arranged along the first direction, and the second cell (20) includes a second cell body (21), a second positive electrode tab (22) and a second negative electrode tab (23), the second positive electrode tab (22) and the second negative electrode tab (23) are formed by the One end of the second cell body (21) extends out; Wherein, the first positive electrode tab (12) is electrically connected with the second positive electrode tab (22), the first negative electrode tab (13) is electrically connected with the second negative electrode tab (23), The first direction and the second direction are opposite directions. 2. The battery according to claim 1, wherein the first positive electrode tab (12) and the second positive electrode tab (22) are disposed opposite to each other, and the first negative electrode tab (13) is opposite to the second positive electrode tab (22). The second negative electrode tabs (23) are oppositely arranged. 3. The battery of claim 1, wherein the battery further comprises: a pole assembly (30), wherein the pole assembly (30) is disposed in the battery case (50); Wherein, the first positive electrode tab (12) and the second positive electrode tab (22) are both electrically connected to the pole assembly (30), or the first negative electrode tab (13) is connected to the The second negative electrode tabs (23) are all electrically connected to the pole assembly (30). 4 . The battery according to claim 3 , wherein the battery case ( 50 ) comprises a steel case, and the first negative electrode tab ( 13 ) and the second negative electrode tab ( 23 ) are both connected to the The steel shell is electrically connected, and both the first positive electrode tab (12) and the second positive electrode tab (22) are electrically connected to the pole assembly (30); Or, the battery case (50) includes an aluminum case, the first positive electrode tab (12) and the second positive electrode tab (22) are both electrically connected to the aluminum case, and the first negative electrode tab ( 13) and the second negative electrode tabs (23) are both electrically connected to the pole assembly (30). 5 . The battery according to claim 3 , wherein a recess ( 51 ) is provided on the battery case ( 50 ), and the recess ( 51 ) is used to receive a pole assembly of another battery. 6 . 6. The battery according to claim 5, wherein the pole assembly (30) is located outside the range where the recess (51) is located; Wherein, the recess (51) is arranged on the side of the battery case (50) away from the pole assembly (30). 7 . The battery according to claim 6 , wherein the orthographic projection of the depression ( 51 ) on the surface of the pole assembly ( 30 ) along the battery casing ( 50 ) and the pole At least parts of the column assemblies (30) are coincident. 8. The battery of any one of claims 3 to 7, wherein the battery housing (50) comprises two opposing first surfaces (52) and four surrounding first surfaces (52). 52) a second surface (53) provided, wherein the area of the first surface (52) is larger than the area of the second surface (53); Wherein, the pole assembly (30) is arranged on the first surface (52). 9 . The battery according to claim 8 , characterized in that there are two pole post assemblies ( 30 ), and both the first positive electrode tab ( 12 ) and the second positive electrode tab ( 22 ) are the same as the One of the pole assemblies (30) is electrically connected, and the first negative pole tab (13) and the second negative pole tab (23) are both electrically connected to the other pole assembly (30); Wherein, the two pole assemblies (30) are arranged on the same first surface (52). 10. A method for assembling a battery, comprising: connecting the first cell (10) and the second cell (20) in parallel; The first battery cell (10) and the second battery cell (20) connected in parallel are enclosed in a battery case (50), so that the first positive electrode tab of the first battery cell (10) (12) and the first negative electrode tab (13) extend from one end of the first cell body (11) of the first cell (10) along the first direction, and the second cell (20) The second positive electrode tab (22) and the second negative electrode tab (23) extend from one end of the second cell body (21) of the second cell (20) along the second direction, and the The first battery cell (10) and the second battery core (20) are enclosed in the battery casing (50) along the first direction; Wherein, the first direction and the second direction are opposite directions. 11. The method for assembling a battery according to claim 10, characterized in that the first battery cell (10) and the second battery cell (20) connected in parallel are enclosed in the battery case (50). ), including: connecting the first battery cell (10) and the second battery cell (20) in parallel on the first housing part (54) of the battery housing (50); The second housing part (55) of the battery housing (50) is sealingly connected to the first housing part (54). 12. The method for assembling a battery according to claim 10 or 11, further comprising: before enclosing the first battery cell (10) and the second battery cell (20) connected in parallel in the battery casing (50), connecting the first positive electrode tab (12) and the second positive electrode tab (22) to the pole assembly (30) of the battery case (50); or The first negative electrode tab (13) and the second negative electrode tab (23) are connected to the pole assembly (30) of the battery case (50). 13. The method for assembling a battery according to claim 12, wherein the first negative electrode tab (13) and the second negative electrode tab (23) are ultrasonically welded first, and the first positive electrode tab (23) is ultrasonically welded. The lug (12) is ultrasonically welded to the second positive electrode lug (22), and then connected to the pole assembly (30) by laser welding. 14. The battery assembling method according to claim 12, wherein the first positive electrode tab (12) and the second positive electrode tab (22) are connected to one of the pole assembly (30) ), the first negative pole tab (13) and the second negative pole tab (23) are connected to another pole assembly (30), and the two pole assemblies (30) are located at on the same large surface of the battery case (50).

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