Battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery which comprises a shell, the shell comprises a cover plate and a shell part, the shell part comprises a side wall and a bottom wall, and the side wall and the bottom wall are of an integrally formed structure; the battery cell is arranged in the shell; the pole component is arranged on the bottom wall; the current collecting piece, the tab connecting part and the pole connecting part are respectively connected with the first tab and the pole assembly in a welding manner, the tab connecting part and the pole connecting part are respectively provided with a first surface and a second surface which face the bottom wall, the distance between the first surface and the second surface is a in the direction perpendicular to the bottom wall, the wall thickness of the bottom wall is b, a / b is 0.2-4, b is less than or equal to 1.5 mm, and a / b is less than or equal to 1.5 mm. Therefore, the stability of connection between the tab connecting part and the first tab and the stability of connection between the pole connecting part and the pole assembly can be guaranteed, the risk of breakage of the first tab can be reduced, and the safe use performance of the battery can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery. Background Art

[0002] In the related art, a pole assembly may be provided on the battery casing, and the pole assembly may be electrically connected to the pole ear of the battery cell. The pole assembly may be provided on a cover plate, and the thickness of the cover plate may be relatively large, which may affect the space utilization of the battery. When the pole assembly is provided on the casing, the above-mentioned assembly method may affect the connection stability between the components. Utility Model Content

[0003] The utility model provides a battery to improve the use performance of the battery.

[0004] The utility model provides a battery, comprising:

[0005] The housing comprises a cover plate and a housing member, the housing member comprises a side wall and a bottom wall, the side wall and the bottom wall are an integrally formed structure, the cover plate is connected to the side wall, and the cover plate is arranged opposite to the bottom wall;

[0006] A battery cell, the battery cell is arranged in the shell, and the battery cell comprises a battery cell body and a first pole ear extending from the battery cell body;

[0007] A pole assembly, the pole assembly is arranged on the bottom wall;

[0008] A current collecting part, the current collecting part includes a pole ear connecting part and a pole post connecting part, the pole ear connecting part and the pole post connecting part are respectively welded to the first pole ear and pole post assembly, the pole ear connecting part and the pole post connecting part respectively have a first surface and a second surface facing the bottom wall, along the direction perpendicular to the large surface of the bottom wall, the distance between the first surface and the second surface is a, the wall thickness of the bottom wall is b, a / b is 0.2-4, b≤1.5mm.

[0009] The battery of the embodiment of the utility model includes a shell, a battery cell, a pole assembly and a current collector. The battery cell and the current collector can be arranged in the shell, and the pole assembly is arranged on the shell, and the battery cell is electrically connected to the pole assembly through the current collector. The shell includes a cover plate and a shell member, the shell member includes an integrally formed side wall and a bottom wall, and the pole assembly is arranged on the bottom wall, thereby improving the internal space utilization of the battery, and the battery cell includes a battery cell body and a first pole ear extending from the battery cell body, and the current collector includes a pole ear connection part and a pole column connection part, and the pole ear connection part and the pole column connection part are respectively welded and connected with the first pole ear and the pole column assembly, thereby facilitating the fixed connection of the pole ear connection part and the pole column connection part with the first pole ear and the pole column assembly respectively. The side wall has a certain depth, and the pole assembly is fixed on the bottom wall. It is difficult to assemble when electrically connected to the first pole ear. The pole ear connection part and the pole column connection part respectively have a first surface and a second surface facing the bottom wall. In the direction perpendicular to the large surface of the bottom wall, the distance between the first surface and the second surface is a, and the wall thickness of the bottom wall is b, that is, the current collector is provided with an uneven first surface and a second surface, so that the current collector can be firmly connected to the first pole ear and the pole column assembly respectively, avoiding the pole ear connection part and the pole column connection part being arranged on the same surface, resulting in welding to the pole ear connection part when the pole column assembly is welded to the current collector, resulting in two welding There is a risk of welding through. At the same time, the side wall and the bottom wall are formed in one piece. When any side of the side wall is hit, the bottom wall will be affected, causing the pole assembly to deform and causing the electrical connection between the battery cell and the pole assembly to fail. The first surface and the second surface are not arranged in the same plane to reduce the risk of the first pole ear breaking. a / b is 0.2-4, b≤1.5mm, which can not only ensure the connection stability of the pole ear connecting part and the pole connecting part with the first pole ear and the pole assembly respectively, and reduce the risk of the first pole ear breaking, but also ensure the high space utilization rate inside the battery, reduce the risk of shell deformation, and thus effectively improve the safe use performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The 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. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing. Among them:

[0011] Figure 1 is a schematic structural diagram of a battery according to an exemplary embodiment;

[0012] Figure 2 is a schematic diagram of a cross-sectional structure of a battery according to an exemplary embodiment;

[0013] Figure 3is a schematic cross-sectional structure diagram of a battery according to another exemplary embodiment;

[0014] Figure 4 is a schematic structural diagram of a battery cell according to an exemplary embodiment;

[0015] Figure 5 is a schematic structural diagram of a current collector of a battery according to a first exemplary embodiment;

[0016] Figure 6 is a schematic structural diagram of a current collector of a battery according to a second exemplary embodiment;

[0017] Figure 7 is a schematic structural diagram of a current collector of a battery according to a third exemplary embodiment;

[0018] Figure 8 FIG. 4 is a schematic structural diagram of a current collector and an insulating member of a battery according to an exemplary embodiment.

[0019] The following are the descriptions of the reference numerals:

[0020] 10. Shell; 11. Cover plate; 12. Shell member; 121. Side wall; 122. Bottom wall; 20. Battery cell; 21. Battery cell body; 22. First pole ear; 23. Second pole ear; 30. Pole assembly; 31. Protrusion; 40. Current collector; 41. Pole ear connection portion; 411. First surface; 42. Pole connection portion; 421. Second surface; 50. Insulator; 51. Depression. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0022] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0023] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0024] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0025] An embodiment of the present utility model provides a battery, please refer to Figures 1 to 8 The battery comprises: a shell 10, the shell 10 comprises a cover plate 11 and a shell member 12, the shell member 12 comprises a side wall 121 and a bottom wall 122, the side wall 121 and the bottom wall 122 are an integrally formed structure, the cover plate 11 is connected to the side wall 121, and the cover plate 11 and the bottom wall 122 are arranged opposite to each other; a battery cell 20, the battery cell 20 is arranged in the shell 10, the battery cell 20 comprises a battery cell body 21 and a first pole ear 22 extending from the battery cell body 21; a pole assembly 30, the pole assembly 30 is arranged on the bottom wall 122; a current collector 40, the current collector 40 includes a pole lug connection portion 41 and a pole post connection portion 42, the pole lug connection portion 41 and the pole post connection portion 42 are respectively welded to the first pole lug 22 and the pole post assembly 30, the pole lug connection portion 41 and the pole post connection portion 42 respectively have a first surface 411 and a second surface 421 facing the bottom wall 122, along the direction perpendicular to the large surface of the bottom wall 122, the distance between the first surface 411 and the second surface 421 is a, the wall thickness of the bottom wall 122 is b, a / b is 0.2-4, b≤1.5mm.

[0026] A battery of one embodiment of the utility model comprises a housing 10, a battery cell 20, a pole assembly 30 and a current collector 40. The battery cell 20 and the current collector 40 can be arranged in the housing 10, and the pole assembly 30 is arranged on the housing 10, and the battery cell 20 is electrically connected to the pole assembly 30 through the current collector 40. The housing 10 comprises a cover plate 11 and a housing member 12, the housing member 12 comprises an integrally formed side wall 121 and a bottom wall 122, and the pole assembly 30 is arranged on the bottom wall 122, thereby improving the internal space utilization of the battery, and the battery cell 20 comprises a battery cell body 21 and a first pole lug 22 extending from the battery cell body 21, and the current collector 40 comprises a pole lug connection portion 41 and a pole lug connection portion 42, and the pole lug connection portion 41 and the pole lug connection portion 42 are respectively welded and connected to the first pole lug 22 and the pole lug assembly 30, thereby facilitating the fixed connection of the pole lug connection portion 41 and the pole lug connection portion 42 to the first pole lug 22 and the pole lug assembly 30, respectively. The side wall 121 has a certain depth, and the pole assembly 30 is fixed on the bottom wall 122. It is difficult to assemble when it is electrically connected to the first pole ear 22. The pole ear connecting portion 41 and the pole connecting portion 42 respectively have a first surface 411 and a second surface 421 facing the bottom wall 122. In the direction perpendicular to the large surface of the bottom wall 122, the distance between the first surface 411 and the second surface 421 is a, and the wall thickness of the bottom wall 122 is b, that is, the current collector 40 is provided with an uneven first surface 411 and a second surface 421, so that the current collector 40 can be firmly connected to the first pole ear 22 and the pole assembly 30 respectively, avoiding the pole ear connecting portion 41 and the pole connecting portion 42 being arranged on the same surface, resulting in the existence of welding to the pole ear connecting portion when the pole assembly 30 and the current collector 40 are welded. The connecting portion 41 causes the risk of welding through during the two weldings. At the same time, the side wall 121 and the bottom wall 122 are integrally formed. When any side of the side wall 121 is hit, the bottom wall 122 will be affected, causing the pole assembly 30 to deform, causing the electrical connection between the battery cell 20 and the pole assembly 30 to fail. The first surface 411 and the second surface 421 are not arranged in the same plane, thereby reducing the risk of the first pole ear 22 breaking. a / b is 0.2-4, b≤1.5mm, which can not only ensure the connection stability of the pole ear connecting portion 41 and the pole connecting portion 42 with the first pole ear 22 and the pole assembly 30 respectively, but also reduce the risk of the first pole ear 22 breaking, but also ensure that the internal height space utilization of the battery is high, reduce the risk of deformation of the shell 10, and thus effectively improve the safe use performance of the battery.

[0027] It should be noted that, combined with Figure 1 As shown, the battery includes a shell 10, the shell 10 includes a cover plate 11 and a shell member 12, the shell member 12 includes a side wall 121 and a bottom wall 122, and the side wall 121 and the bottom wall 122 are an integrally formed structure, thereby improving the forming efficiency of the shell member 12, thereby improving the manufacturing efficiency of the battery.

[0028] The cover plate 11 is connected to the side wall 121, and the cover plate 11 is arranged opposite to the bottom wall 122. The bottom wall 122 only refers to the structure arranged opposite to the cover plate 11, and does not limit the installation position of the bottom wall 122 when the batteries are grouped. For example, when the batteries are grouped, the bottom wall 122 can be located at the bottom of the batteries, that is, the bottom wall 122 can be arranged toward the bottom plate of the box; or, when the batteries are grouped, the bottom wall 122 can be located at the top of the batteries, that is, the bottom wall 122 can be arranged toward the top cover of the box.

[0029] Combination Figures 1 to 3 As shown, the pole assembly 30 is arranged on the bottom wall 122, which can improve the overall space utilization rate inside the battery. However, the side wall 121 and the bottom wall 122 are an integrally formed structure, and the side wall 121 has a certain depth. It is difficult to fix the pole assembly 30 on the bottom wall 122 and electrically connect it to the battery cell 20.

[0030] Combination Figure 2 and Figure 3 As shown, by making the current collector 40 include a pole lug connection part 41 and a pole column connection part 42, and the pole lug connection part 41 and the pole column connection part 42 respectively have a first surface 411 and a second surface 421 facing the bottom wall 122, and there is a certain height difference between the first surface 411 and the second surface 421, so that the pole lug connection part 41 and the pole column connection part 42 can be firmly welded to the first pole lug 22 and the pole column assembly 30 respectively, and the risk of welding through the current collector 40 due to energy influence during the two welding processes can also be avoided. At the same time, the side wall 121 and the bottom wall 122 are an integrally formed structure. When any side of the side wall 121 is hit, the bottom wall 122 will be affected, causing the pole column assembly 30 to deform, causing the electrical connection between the battery cell 20 and the pole column assembly 30 to fail. By making the first surface 411 and the second surface 421 not in the same plane, the risk of the first pole lug 22 of the battery cell 20 breaking can be effectively reduced.

[0031] Combination Figure 2 As shown, along the direction perpendicular to the large surface of the bottom wall 122, the distance between the first surface 411 and the second surface 421 can be expressed as a, and the wall thickness of the bottom wall 122 can be expressed as b. The ratio of the distance a between the first surface 411 and the second surface 421 to the wall thickness b of the bottom wall 122 is too small, and the deformation of the bottom wall 122 leads to a greater risk of tearing the first pole ear 22. When the battery is assembled, there is a risk of welding through the first pole ear 22 when welding the pole assembly 30, and the bottom wall 122 is too thick and occupies a large space inside the battery. The ratio of the distance a between the first surface 411 and the second surface 421 to the wall thickness b of the bottom wall 122 is too large, resulting in a low utilization rate of the internal height space of the battery. In addition, the risk of deformation of the bottom wall 122 is greater.

[0032] Combination Figure 2 and Figure 3As shown, the direction perpendicular to the large surface of the bottom wall 122 can be represented as X, and the large surface of the bottom wall 122 is the surface of the bottom wall 122 with the largest area.

[0033] By making the ratio of the distance a between the first surface 411 and the second surface 421 to the wall thickness b of the bottom wall 122 be 0.2-4, b≤1.5 mm, the safe use performance of the battery can be effectively improved.

[0034] The ratio of the distance a between the first surface 411 and the second surface 421 to the wall thickness b of the bottom wall 122 can be 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9 or 4, etc.

[0035] Since the pole assembly 30 is arranged on the bottom wall 122 of the shell 10, the overall space utilization rate inside the battery can be improved. However, the side wall 121 and the bottom wall 122 are integrally formed, that is, the side wall 121 has a certain depth. It is difficult to assemble the pole assembly by fixing it to the bottom wall 122 and electrically connecting it to the battery cell 20. By arranging the current collector 40 in different planes, the current collector 40 can be firmly connected to the pole assembly 30 and the first pole ear 22 respectively, avoiding that the pole ear connection part 41 and the pole column connection part 42 are arranged on the same surface, resulting in the risk of welding to the pole ear connection part 41 when the pole assembly is welded to the current collector 40, resulting in the risk of welding through the two weldings. At the same time, the side wall 121 and the bottom wall 122 are integrally formed. When any side of the side wall 121 is hit, the bottom wall 122 will be affected, causing the pole assembly 30 to deform, causing the electrical connection between the battery cell 20 and the pole assembly 30 to fail. By arranging the pole ear connection part 41 and the pole column connection part 42 not in the same plane, the risk of the first pole ear 22 breaking is reduced. By controlling the ratio of the distance a between the first surface 411 and the second surface 421 to the wall thickness b of the bottom wall 122, if the ratio is too small, the shell 10 may deform, resulting in a greater risk of tearing the first pole ear 22. At this time, when the two are assembled, there is a risk of welding through the pole ear when welding the pole assembly, and the bottom wall 122 is too thick and occupies a larger space inside the battery; if the ratio is too large, the internal height space utilization of the battery is low, and the shell 10 is also at a greater risk of deformation.

[0036] The pole tab connection portion 41 and the pole post connection portion 42 are respectively connected to the first pole tab 22 and the pole post assembly 30 by welding, and the welding method may be laser welding, resistance welding or ultrasonic welding.

[0037] In one embodiment, the first pole lug 22 and the pole assembly 30 are welded to the first surface 411 and the second surface 421 respectively, so that the two weld marks on the current collector 40 are not on the same surface, thereby improving the connection stability between the pole lug connection portion 41 and the pole connection portion 42 and the first pole lug 22 and the pole assembly 30.

[0038] It should be noted that, in some embodiments, it is not excluded that the pole assembly 30 is welded to the second surface 421 , and the first pole tab 22 and the pole tab connecting portion 41 are welded to each other on another surface away from the first surface 411 .

[0039] In one embodiment, Figure 2 and Figure 5 As shown, along the direction perpendicular to the large surface of the bottom wall 122, the second surface 421 is arranged closer to the pole assembly 30 than the first surface 411, that is, the distance between the first surface 411 and the bottom wall 122 is greater than the distance between the second surface 421 and the bottom wall 122, thereby allowing a relatively small distance between the pole assembly 30 and the pole connecting portion 42, ensuring that the pole assembly 30 and the pole connecting portion 42 can fit tightly, thereby facilitating the connection between the pole assembly 30 and the pole connecting portion 42.

[0040] In one embodiment, the surface where the pole assembly 30 is connected to the pole connecting portion 42 is flat, which not only ensures the flow area between the pole assembly 30 and the pole connecting portion 42, but also reduces the overall processing difficulty of the pole assembly 30, thereby improving the overall manufacturing efficiency of the battery.

[0041] In one embodiment, the first pole lug 22 is accommodated in the space formed by the pole lug connection portion 41 and the pole column connection portion 42, thereby facilitating the first pole lug 22 to overlap the first surface 411, which not only facilitates the connection between the first pole lug 22 and the pole lug connection portion 41, but also allows the first pole lug 22 to fully utilize the height difference space formed between the pole lug connection portion 41 and the pole column connection portion 42, thereby improving the battery space utilization rate, and also allows the first pole lug 22 and the pole lug connection portion 41 to have a relatively high current flow capacity.

[0042] The space formed by the tab connection portion 41 and the pole connection portion 42 , that is, the space formed by the height difference between the first surface 411 and the second surface 421 , can facilitate the storage of the first tab 22 , thereby improving the space utilization of the battery.

[0043] The first surface 411 of the pole tab connection portion 41 is arranged away from the battery cell body 21. Therefore, the first pole tab 22 is overlapped on the first surface 411. It can be considered that the first pole tab 22 bypasses the pole tab connection portion 41 and overlaps on the first surface 411, thereby making full use of the height difference between the first surface 411 and the second surface 421, thereby improving the space utilization of the battery.

[0044] In one embodiment, Figure 3 and Figure 6 As shown, along the direction perpendicular to the large surface of the bottom wall 122, the first surface 411 is arranged closer to the pole assembly 30 than the second surface 421, that is, the distance between the first surface 411 and the bottom wall 122 is smaller than the distance between the second surface 421 and the bottom wall 122, thereby increasing the height of the pole assembly 30, improving the current carrying capacity of the pole assembly 30, and providing sufficient extension space for the first pole ear 22.

[0045] In one embodiment, Figure 3 As shown, a protrusion 31 is provided at one end of the pole assembly 30 facing the pole connection part 42, and the protrusion 31 is welded to the pole connection part 42, thereby enabling the pole assembly 30 to be accurately positioned with the pole connection part 42 through the protrusion 31, thereby improving the connection strength between the protrusion 31 of the pole assembly 30 and the pole connection part 42.

[0046] A protrusion 31 is provided at one end of the pole assembly 30 facing the pole connecting portion 42 . The protrusion 31 is a part of the pole assembly 30 , thereby facilitating welding of the pole assembly 30 and the pole connecting portion 42 .

[0047] In one embodiment, the ratio of the wall thickness of the side wall 121 to the wall thickness of the bottom wall 122 is 0.3-0.5. On the basis of ensuring the overall structural strength of the bottom wall 122 and the side wall 121, the overall space utilization of the battery can also be ensured, thereby improving the safe use performance of the battery.

[0048] If the ratio of the thickness of the side wall 121 to the thickness of the bottom wall 122 is too small, the strength of the side wall 121 is relatively weak, which is not conducive to ensuring the safety performance of the battery. If the ratio of the thickness of the side wall 121 to the thickness of the bottom wall 122 is too large, the side wall 121 is difficult to expand quickly, which is not conducive to fully exerting the performance of the battery, and the strength of the bottom wall 122 is relatively weak, which is not conducive to ensuring the safe use performance of the battery.

[0049] The ratio of the wall thickness of the side wall 121 to the wall thickness of the bottom wall 122 may be 0.3, 0.32, 0.35, 0.36, 0.38, 0.4, 0.42, 0.45, 0.46, 0.48 or 0.5, etc.

[0050] In one embodiment, the thickness of the bottom wall 122 is b, where b≥0.5 mm, which can effectively control the structural strength of the bottom wall 122 and prevent the battery housing 10 from being greatly deformed, thereby affecting the overall safety performance of the battery.

[0051] The wall thickness b of the bottom wall 122 can be 0.5mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm or 1.5mm, etc.

[0052] In one embodiment, the thickness of the current collecting member 40 is 0.3 mm-2 mm, which can not only ensure the current flow capacity of the current collecting member 40 but also facilitate the welding of the current collecting member 40, thereby improving the safe use performance of the battery.

[0053] The thickness of the current collecting member 40 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm, etc.

[0054] In one embodiment, Figure 7 As shown, there are two pole lug connecting parts 41, and along the width direction of the bottom wall 122, the two pole lug connecting parts 41 are respectively connected to the opposite ends of the pole column connecting part 42; wherein, the two pole lug connecting parts 41 are symmetrically arranged about the pole column connecting part 42, and the width direction of the bottom wall 122 is perpendicular to the large surface of the battery body 21, which not only facilitates the installation of the current collector 40, but also ensures that the current collector 40 can have reliable current passing capacity, thereby improving the safe use performance of the battery.

[0055] The two pole ear connections 41 are symmetrically arranged about the pole column connection 42, that is, the structures of the two pole ear connections 41 can be considered to be consistent, and the large surface of the battery cell body 21 can be considered to be the surface with the largest area of ​​the battery cell body 21, and the width direction of the bottom wall 122 is perpendicular to the large surface of the battery cell body 21, that is, the thickness direction of the battery can be perpendicular to the large surface of the battery cell body 21.

[0056] In one embodiment, along the width direction of the bottom wall 122, the ratio of the maximum distance w1 between the two pole lug connections 41 to the size w2 of the pole connection portion 42 is 1.2-5, thereby ensuring that the pole lug connection portion 41 and the first pole lug 22 can have a reliable connection area, and also ensuring the current flow capacity between the pole connection portion 42 and the pole assembly 30.

[0057] Combination Figure 7 As shown, the maximum distance between the two pole lug connections 41 can be expressed as w1, and the size of the pole connection 42 can be expressed as w2. The ratio of the maximum distance w1 between the two pole lug connections 41 to the size w2 of the pole connection 42 is too small, and the connection area between the pole lug connection 41 and the first pole lug 22 is small, and there is a risk of fracture due to stress concentration; the ratio of the maximum distance w1 between the two pole lug connections 41 to the size w2 of the pole connection 42 is too large, and the flow area between the pole assembly 30 and the pole connection 42 is narrow, which affects the overall charge and discharge rate and heat dissipation efficiency of the battery.

[0058] The ratio of the maximum distance w1 between the two pole lug connecting portions 41 to the size w2 of the pole connecting portion 42 can be 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9 or 5, etc.

[0059] It should be noted that at least two battery cells 20 may be arranged in the battery housing 10 , and the first pole tab 22 of at least one battery cell 20 may be welded to one pole tab connection portion 41 , and the first pole tab 22 of the remaining battery cells 20 may be welded to another pole tab connection portion 41 .

[0060] In one embodiment, Figure 4 As shown, the battery cell 20 also includes a second pole ear 23, and the first pole ear 22 and the second pole ear 23 with opposite polarities extend from the same end of the battery cell body 21, thereby reducing the overall height space of the battery cell 20, making full use of the internal space of the battery casing 10, and improving the overall height space utilization of the battery, thereby improving the energy density of the battery.

[0061] Two pole assemblies 30 may be provided on the battery housing 10, and the two pole assemblies 30 may be electrically connected to the first pole tab 22 and the second pole tab 23, respectively, wherein the first pole tab 22 may be electrically connected to one pole assembly 30 through a current collector 40. The connection method between the second pole tab 23 and the other pole assembly 30 is not limited, for example, the second pole tab 23 may also be connected to the other pole assembly 30 through a similar current collector.

[0062] It should be noted that, in some embodiments, it is not excluded that the first electrode tab 22 and the second electrode tab 23 with opposite polarities extend from opposite ends of the battery cell body 21 .

[0063] In one embodiment, in combination Figure 8 As shown, the battery also includes an insulating member 50, which is located between the bottom wall 122 and the battery cell 20. A recess 51 is formed on the side of the insulating member 50 facing the battery cell 20. The current collector 40 is located in the recess 51, and at least a portion of the first pole ear 22 is located in the recess 51. The insulating member 50 can not only ensure the insulation performance between the bottom wall 122 and the battery cell 20, but also make reasonable use of the internal space of the battery casing 10, thereby improving the space utilization of the battery.

[0064] Among them, the depth of the recess 51 is 0.3mm-5mm, which not only allows at least part of the first pole ear 22 to be accommodated in the recess 51 to improve the internal space utilization of the battery, but also avoids the overlap of the first pole ear 22 and the bottom wall 122, and also avoids the depth of the recess 51 being too large, resulting in low internal space utilization of the battery.

[0065] The depth of the recess 51 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.2mm, 2.5mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.6mm, 4.8mm or 5mm, etc.

[0066] In one embodiment, there are at least two battery cells 20 , and at least two battery cells 20 are disposed in the housing 10 , thereby increasing the overall capacity of the battery and improving the space utilization of the battery housing 10 .

[0067] For example, two battery cells 20 may be disposed in the battery housing 10 , and the two first tabs 22 of the two battery cells 20 may be connected to the two tab connecting portions 41 , respectively.

[0068] In some embodiments, only one battery cell 20 may be disposed in the battery housing 10 .

[0069] It should be noted that the battery includes a cell and an electrolyte, which is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, the stacked portion including a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged. The first pole sheet and the second pole sheet are coated with an active material.

[0070] In one embodiment, the battery may be a quadrangular prism battery. A quadrangular prism battery mainly refers to a battery having a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and can be arc transitions.

[0071] The battery can be a laminated battery, which is not only convenient to group, but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first pole piece stacked on top of each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell.

[0072] Alternatively, the battery may be a wound battery, that is, a first pole sheet, a second pole sheet with electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.

[0073] In one embodiment, the battery may be a cylindrical battery, or the battery may be a hexagonal prism battery. The battery may be a wound battery, that is, a first pole piece, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery cell.

[0074] An embodiment of the utility model further provides a battery pack, comprising the above-mentioned battery.

[0075] A battery of a battery pack of an embodiment of the utility model comprises a shell 10, a battery cell 20, a pole assembly 30 and a current collector 40. The battery cell 20 and the current collector 40 can be arranged in the shell 10, and the pole assembly 30 is arranged on the shell 10, and the battery cell 20 is electrically connected to the pole assembly 30 through the current collector 40. The shell 10 includes a cover plate 11 and a shell member 12, the shell member 12 includes an integrally formed side wall 121 and a bottom wall 122, and the pole assembly 30 is arranged on the bottom wall 122, thereby improving the internal space utilization of the battery, and the battery cell 20 includes a battery cell body 21 and a first pole ear 22 extending from the battery cell body 21, and the current collector 40 includes a pole ear connection portion 41 and a pole column connection portion 42, the pole ear connection portion 41 and the pole column connection portion 42 are respectively welded to the first pole ear 22 and the pole column assembly 30, thereby facilitating the fixed connection between the pole ear connection portion 41 and the pole column connection portion 42 and the first pole ear 22 and the pole column assembly 30, respectively. The side wall 121 has a certain depth, and the pole assembly 30 is fixed on the bottom wall 122. It is difficult to assemble when it is electrically connected to the first pole ear 22. The pole ear connecting portion 41 and the pole connecting portion 42 respectively have a first surface 411 and a second surface 421 facing the bottom wall 122. In the direction perpendicular to the large surface of the bottom wall 122, the distance between the first surface 411 and the second surface 421 is a, and the wall thickness of the bottom wall 122 is b, that is, the current collector 40 is provided with an uneven first surface 411 and a second surface 421, so that the current collector 40 can be firmly connected to the first pole ear 22 and the pole assembly 30, respectively, to avoid the pole ear connecting portion 41 and the pole connecting portion 42 being arranged on the same surface, resulting in welding to the pole ear connection when the pole assembly 30 and the current collector 40 are welded. Part 41, resulting in the risk of welding through in the two weldings, while the side wall 121 and the bottom wall 122 are integrally formed, when any side of the side wall 121 is hit, the bottom wall 122 will be affected, causing the pole assembly 30 to deform, causing the electrical connection between the battery cell 20 and the pole assembly 30 to fail, and the first surface 411 and the second surface 421 are not arranged in the same plane, thereby reducing the risk of the first pole ear 22 breaking, a / b is 0.2-4, b≤1.5mm, which can not only ensure the connection stability of the pole ear connecting part 41 and the pole connecting part 42 with the first pole ear 22 and the pole assembly 30 respectively, and reduce the risk of the first pole ear 22 breaking, but also ensure that the internal height space utilization of the battery is high, reduce the risk of deformation of the shell 10, and thus effectively improve the safe use performance of the battery pack.

[0076] In one embodiment, the battery pack is a battery module or a battery pack.

[0077] 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 to fix the plurality of batteries.

[0078] It should be noted that multiple batteries can be arranged in a battery box after forming a battery module, and multiple batteries can be fixed by end plates and side plates. Multiple batteries can be directly arranged in the battery box, that is, there is no need to group multiple batteries, in which case the end plates and side plates can be removed.

[0079] Those skilled in the art will readily come up with other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. The present disclosure is intended to cover any variation, use or adaptation of the present utility model, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and example embodiments are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0080] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from its scope. The scope of protection of the present disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that: include: A shell (10), the shell (10) comprising a cover plate (11) and a shell member (12), the shell member (12) comprising a side wall (121) and a bottom wall (122), the side wall (121) and the bottom wall (122) being an integrally formed structure, the cover plate (11) being connected to the side wall (121), and the cover plate (11) and the bottom wall (122) being arranged opposite to each other; A battery cell (20), the battery cell (20) being arranged in the housing (10), the battery cell (20) comprising a battery cell body (21) and a first electrode tab (22) extending from the battery cell body (21); A pole assembly (30), wherein the pole assembly (30) is arranged on the bottom wall (122); A current collector (40), the current collector (40) comprising a pole lug connection portion (41) and a pole column connection portion (42), the pole lug connection portion (41) and the pole column connection portion (42) being respectively welded to the first pole lug (22) and the pole column assembly (30), the pole lug connection portion (41) and the pole column connection portion (42) respectively having a first surface (411) and a second surface (421) facing the bottom wall (122), along a direction perpendicular to the large surface of the bottom wall (122), a distance between the first surface (411) and the second surface (421) is a, the wall thickness of the bottom wall (122) is b, a / b is 0.2-4, and b≤1.5 mm.

2. The battery according to claim 1, characterized in that In a direction perpendicular to the large surface of the bottom wall (122), the second surface (421) is arranged closer to the pole assembly (30) than the first surface (411).

3. The battery according to claim 2, characterized in that The surface where the pole assembly (30) is connected to the pole connection portion (42) is a plane, and / or the first pole lug (22) is accommodated in a space formed by the pole lug connection portion (41) and the pole connection portion (42).

4. The battery according to claim 1, characterized in that Along a direction perpendicular to the large surface of the bottom wall (122), the first surface (411) is arranged closer to the pole assembly (30) than the second surface (421).

5. The battery according to any one of claims 1 to 4, characterized in that The ratio of the wall thickness of the side wall (121) to the wall thickness of the bottom wall (122) is 0.3-0.

5.

6. The battery according to any one of claims 1 to 4, characterized in that b≥0.5mm, and / or the thickness of the current collecting member (40) is 0.3mm-2mm.

7. The battery according to any one of claims 1 to 4, characterized in that There are two pole lug connection parts (41), and along the width direction of the bottom wall (122), the two pole lug connection parts (41) are respectively connected to opposite ends of the pole connection part (42); The two pole lug connecting portions (41) are symmetrically arranged with respect to the pole connecting portion (42), and the width direction of the bottom wall (122) is perpendicular to the large surface of the battery cell body (21).

8. The battery according to claim 7, characterized in that Along the width direction of the bottom wall (122), the ratio of the maximum distance w1 between the two pole lug connecting portions (41) to the size w2 of the pole connecting portion (42) is 1.2-5.

9. The battery according to any one of claims 1 to 4, characterized in that The battery further comprises an insulating member (50), the insulating member (50) being located between the bottom wall (122) and the battery cell (20), a recess (51) being formed on a side of the insulating member (50) facing the battery cell (20), the current collector (40) being located in the recess (51), and at least a portion of the first electrode tab (22) being located in the recess (51); Wherein, the depth of the depression (51) is 0.3mm-5mm.

10. The battery according to any one of claims 1 to 4, characterized in that The battery is a quadrangular prism-shaped battery, and / or the first electrode tab (22) and the electrode column assembly (30) are welded to the first surface (411) and the second surface (421) respectively.

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