CN217468696U - Battery pack and vehicle with same - Google Patents

Abstract

The utility model discloses a battery pack and vehicle that has it, battery pack includes battery and first connecting piece, the battery is a plurality of and arranges in proper order along first direction, every battery includes shell and book core, it locates in the shell to roll up the core, and including rolling up core main part, anodal ear and negative pole ear are located respectively and roll up the both sides of core main part in first direction, the one side each other of orientation of two adjacent shells is formed with first opening respectively, the anodal ear of one of them and the negative pole ear of another in two adjacent batteries set up relatively along first direction and all expose in corresponding first opening part; the first connecting piece is electrically connected between the positive electrode tab of one of the two adjacent batteries and the negative electrode tab of the other one of the two adjacent batteries, and the first connecting piece is fixedly connected with the two adjacent outer shells respectively. According to the utility model discloses a battery pack reduces buss bar quantity, has reduced battery pack's cost and weight, and has improved battery pack's effective space utilization and energy density.

Description

Battery pack and vehicle with same

Technical Field

The utility model belongs to the technical field of the power battery technique and specifically relates to a battery pack and vehicle that has it is related to.

Background

With the increasing maturity of lithium ion battery technology, lithium ion batteries are widely used in the field of electric vehicles as power batteries. The voltage of the single battery is relatively small due to the limitation of a battery chemical system. In the related art, a plurality of unit batteries of the battery module are connected in series and/or in parallel through a busbar (bus bar) to increase the overall voltage of the battery module. However, the number of buss bars required by the battery module is large, so that the whole battery module has high cost, high weight, low space utilization rate of the battery pack and low energy density.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a battery pack, battery pack can reduce the quantity of busbar, has reduced battery pack's cost and weight, and has improved battery pack's effective space utilization and energy density.

The utility model discloses still provide a vehicle that has above-mentioned battery pack.

According to the utility model discloses battery pack of first aspect embodiment includes: the battery comprises a plurality of batteries which are sequentially arranged along a first direction, each battery comprises a shell and a winding core, the winding core is arranged in the shell and comprises a winding core main body, a positive electrode lug and a negative electrode lug, the positive electrode lug and the negative electrode lug are respectively positioned on two sides of the winding core main body in the first direction, one sides of every two adjacent shells facing each other are respectively provided with a first opening, and the positive electrode lug of one of every two adjacent batteries and the negative electrode lug of the other battery are oppositely arranged along the first direction and are exposed at the corresponding first opening; the first connecting piece is electrically connected between the positive electrode tab of one of the two adjacent batteries and the negative electrode tab of the other one of the two adjacent batteries, and the first connecting piece is fixedly connected with the two adjacent outer shells respectively.

According to the embodiment of the utility model, through arranging a plurality of batteries in proper order along the first direction, and the positive pole ear of one of them and another negative pole ear in two adjacent batteries set up along the first direction relatively, and connect the electricity between the positive pole ear of above-mentioned one of them battery and the negative pole ear of above-mentioned another battery with first connection piece, in order to realize the series connection of two adjacent batteries 1, for some technologies, adopt busbar to carry out the electricity connection between the adjacent batteries, this application can reduce battery pack's manufacturing cost, alleviate battery pack's weight, make things convenient for battery pack's equipment, be favorable to saving battery pack's space occupancy simultaneously; when the battery pack is used for the battery module, the effective space occupancy of the battery is convenient to improve, and the energy density of the battery module is improved.

In some embodiments, the thickness direction of the first connecting piece is parallel to the first direction, and the first connecting piece is fixedly connected with the positive electrode tab of one of the two adjacent batteries and the negative electrode tab of the other battery; and/or the edge part of the first connecting sheet is in limited fit with the first opening along the first direction, so that the first connecting sheet covers the first opening, and the edge part of the first connecting sheet and two adjacent shells are fixed.

In some embodiments, the jelly roll further comprises a first insulating member disposed between the jelly roll main body and the outer case and wrapped around the jelly roll main body, and the battery assembly further comprises: a second insulating member wrapping the first connection tab and the plurality of batteries.

In some embodiments, the first connecting piece comprises: the first electric connecting piece is fixedly and electrically connected with the positive lug of one of the two adjacent batteries through the corresponding first opening; a second electrical connector electrically connected to the first electrical connector, the second electrical connector being fixed to and electrically connected to the negative tab of the other of the two adjacent batteries through the corresponding first opening, the first and second electrical connectors being of different materials.

In some embodiments, the first connecting piece further comprises: fixed connector, fixed connector is formed with the mounting hole, first electric connector with second electric connector all cooperate in the mounting hole, fixed connector has the edge portion, the edge portion centers on the mounting hole sets up, just the periphery wall of edge portion has boss portion in the axial of mounting hole, boss portion's both ends respectively with adjacent two first open-ended border end to support the cooperation and with adjacent two first open-ended border is all fixed.

In some embodiments, the fixed connector is injection molded with the first and second electrical connectors.

In some embodiments, the fixed connection comprises: a third insulating member on which the mounting hole is formed and of which an outer circumferential wall is formed with a mounting groove; the metal piece is matched with the mounting groove, and in the radial direction of the mounting hole, the outer end of the metal piece extends out of the mounting groove to form the edge portion.

In some embodiments, the battery assembly further comprises: the second connecting piece is located two at both ends, and the second opening is formed on the side of the two batteries that deviate from each other of the shell, the negative pole ear of one of the batteries that is located two at both ends and the positive pole ear of the other one are exposed to the corresponding second opening, the second connecting piece is located the second opening department in order to shelter from the second opening, and with positive pole ear or negative pole ear electricity is connected.

In some embodiments, the second connecting tab has the same structure as the first connecting tab.

According to the utility model discloses vehicle of second aspect embodiment, including the battery module, the battery module includes at least a set of group battery, the group battery includes a plurality of battery packs of arranging in proper order along the second direction, battery pack is according to the utility model discloses the above-mentioned battery pack of first aspect embodiment, the second direction with the first direction is perpendicular.

According to the utility model discloses the vehicle through adopting foretell battery pack, has reduced whole car dead weight, has improved the duration of a journey ability of vehicle.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic view of a battery assembly according to an embodiment of the present invention;

FIG. 2 is a schematic view of two adjacent cells of the battery assembly shown in FIG. 1;

FIG. 3 is a schematic view of a jellyroll of the battery shown in FIG. 2;

FIG. 4 is yet another schematic view of the jellyroll of the battery shown in FIG. 2;

FIG. 5 is a schematic view of the first connector tab shown in FIG. 2;

FIG. 6 is a cross-sectional view of the first connector tab shown in FIG. 5;

FIG. 7 is an enlarged view of portion A shown in FIG. 6;

fig. 8 is an exploded view of the first connecting piece shown in fig. 6;

fig. 9 is a schematic diagram of a battery assembly according to yet another embodiment of the present invention.

Reference numerals:

a battery pack 100,

A battery 1, a shell 11, a winding core 12,

A first opening 111, a second opening 112,

Winding core body 121, positive tab 122, negative tab 123, first insulator 124,

A first connecting piece 2, an edge portion 21, a first electric connecting member 22, a second electric connecting member 23, a fixed connecting member 24,

A boss portion 211, a third insulating member 241, a metal member 242,

Mounting holes 2411, mounting grooves 2412,

A second insulating part 3, a second connecting piece 4,

A first battery 5, a first case 51, a first winding core 52,

A first winding core main body 521, a first positive tab 522,

A second battery 6, a second case 61, a second winding core 62,

A second winding core main body 621 and a second positive electrode tab 622.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials.

Next, with reference to the drawings, a battery assembly 100 according to an embodiment of the present invention is described.

As shown in fig. 1 and 2, the battery assembly 100 includes a plurality of batteries 1, the batteries 1 are a plurality of batteries 1, and the plurality of batteries 1 are sequentially arranged along a first direction (e.g., a front-back direction in fig. 2), each battery 1 includes a case 11 and a winding core 12, the winding core 12 is disposed in the case 11, the case 11 is wrapped around at least a portion of the winding core 12, which facilitates the case 11 to protect the winding core 12 and maintain a shape of the winding core 12, the winding core 12 includes a winding core main body 121, a positive tab 122 and a negative tab 123, the positive tab 122 and the negative tab 123 are respectively disposed on two sides of the winding core main body 121 in the first direction, i.e., the positive tab 122 is disposed on one side of the winding core main body 121 in the first direction, the negative tab 123 is disposed on the other side of the winding core main body 121 in the first direction, first openings 111 are formed on one side of two adjacent cases 11 facing each other, the positive tab 122 and the negative tab 123 of one of the two adjacent batteries 1 are disposed opposite to each other in the first direction and are exposed at the corresponding first opening 111, the positive tab 122 of one of the two adjacent batteries 1 and the negative tab 123 of the other battery 1 are disposed opposite to each other along the first direction, and the positive tab 122 of the one battery 1 is exposed to the first opening 111 of the one battery 1 and the negative tab 123 of the other battery 1 is exposed to the first opening 111 of the one battery 1.

As shown in fig. 2 and 4, the battery assembly 100 further includes a first connecting tab 2, the first connecting tab 2 is electrically connected between the positive tab 122 of one of the two adjacent batteries 1 and the negative tab 123 of the other battery 1, the first connecting tab 2 is fixedly connected to the two adjacent outer cases 11, respectively, so that the first connecting tab 2 is integrally connected to the outer cases 11 of the two adjacent batteries 1, which is beneficial for ensuring the stability of the electrical connection between the two adjacent batteries 1 of the first connecting tab 2, and the adjacent batteries 1 do not need to be electrically connected by using a buss bar, so as to reduce the number of buss bars, facilitate simplifying the structure of the battery assembly 100, facilitating the assembly of the battery assembly 100, reducing the cost of the battery assembly 100, and reducing the weight of the battery assembly 100, and is advantageous for saving the space occupancy rate of the battery assembly 100.

It can be seen that the first opening 111 is used to avoid the electrical connection between the first connection tab 2 and the positive tab 122 or the negative tab 123, so as to ensure that the electrical connection between the first connection tab 2 and the positive tab 122 or the negative tab 123 is reliable.

When battery pack 100 is applied to battery module, a plurality of battery packs 100 are established ties and/or are parallelly connected, in the battery module of being convenient for reduce, the quantity of the buss bar that electric connection battery 1 adopted, be convenient for simplify battery module's structure, make things convenient for battery module's equipment, be favorable to alleviateing battery module's cost simultaneously, alleviate battery module's weight, and promote battery module's effective space utilization to effectively promote battery module's energy density.

According to the battery assembly 100 of the embodiment of the present invention, the plurality of batteries 1 are sequentially arranged along the first direction, and the positive tab 122 of one of the two adjacent batteries 1 and the negative tab 123 of the other battery 1 are oppositely arranged along the first direction, and the first connecting piece 2 is electrically connected between the positive tab 122 of the one battery 1 and the negative tab 123 of the other battery 1, so as to realize the series connection of the two adjacent batteries 1, and compared with some technologies, the adjacent batteries are electrically connected by busbar, the present application can reduce the production cost of the battery assembly 100, reduce the weight of the battery assembly 100, facilitate the assembly of the battery assembly 100, and simultaneously facilitate the saving of the space occupancy rate of the battery assembly 100; when the battery pack 100 is used in a battery module, it is convenient to increase the effective space occupancy of the battery 1 and to increase the energy density of the battery module.

Alternatively, the battery 1 is a lithium ion battery, such as a lithium iron phosphate battery, or a ternary lithium battery, etc.

In some embodiments, battery 1 forms to the cuboid, and two adjacent batteries 1 can arrange along the length direction of the cuboid that battery 1 corresponds for a plurality of batteries 1 can closely arrange in proper order, are convenient for reduce the occupation ratio in the unit volume space, are favorable to further improving battery 1's effective space occupation ratio, further promote battery pack 100's effective space utilization, and then improve battery pack 100's energy density.

Of course, the battery 1 may have other shapes such as a cylindrical shape, a polygonal cylindrical shape, or the like.

Alternatively, the voltage of the battery 1 is U, 3.2V ≦ U ≦ 4.5V, e.g., U may be 3.2V, or 2.7V, or 4.5V, etc.

It is understood that the number of the cells 1 of the battery assembly 100 is two or more in the present application; for example, in the example of fig. 9, there are two cells 1 of the battery assembly 100; of course, the number of the cells 1 of the battery assembly 100 may be three, or four or more. Taking two adjacent batteries 1 as an example, as shown in fig. 9, the two adjacent batteries 1 are a first battery 5 and a second battery 6, respectively, the first battery 5 includes a first outer casing 51 and a first winding core 52, the first winding core 52 is disposed in the first outer casing 51, the first winding core 52 includes a first winding core main body 521, a first positive tab 522 and a first negative tab, the first positive tab 522 and the first negative tab are respectively located on two sides of the first winding core main body 521 in the first direction, the second battery 6 includes a second outer casing 61 and a second winding core 62, the second winding core 62 is disposed in the second outer casing 6111, the second winding core 62 includes a second winding core main body 621, a second positive tab 622 and a second negative tab, the second positive tab 622 and the second negative tab are respectively located on two sides of the second winding core main body in the first direction, the first opening 111 is formed on one side of the first outer casing 51 and the second outer casing 61 facing each other, the first negative tab and the second positive tab 622 are oppositely arranged along the first direction, the first negative tab is exposed at the first opening 111 of the first casing 51, the second positive tab 622 is exposed at the first opening 111 of the second casing 61, the first connection tab 2 is electrically connected between the second positive tab 622 and the first negative tab, and the first connection tab 2 is fixedly connected with the first casing 51 and the second casing 61 respectively.

Of course, the arrangement manner of the adjacent two batteries 1 is not limited thereto; for example, the first positive tab 522 and the second negative tab may be oppositely disposed along the first direction, the first positive tab 522 is exposed to the first opening 111 of the first housing 51, the second negative tab is exposed to the first opening 111 of the second housing 61, the first connection tab 2 is electrically connected between the second negative tab and the first positive tab 522, and the first connection tab 2 is fixedly connected to the first housing 51 and the second housing 61, respectively.

In some embodiments of the present invention, the thickness direction of the first connection plate 2 is parallel to the first direction, and two adjacent batteries 1 may be respectively disposed on both sides of the thickness of the first connection plate 2.

Note that "the thickness direction of the first connecting piece 2 is parallel to the first direction" may include the following cases: 1. the thickness direction of the first connecting piece 2 is absolutely parallel to the first direction; 2. the thickness direction of the first connecting piece 2 is approximately parallel to the first direction, and the relative angle between the thickness direction of the first connecting piece 2 and the first direction is small, for example, the angle between the thickness direction of the first connecting piece 2 and the first direction does not exceed 20 °.

The first connecting piece 2 is fixedly connected with the positive tab 122 of one of the two adjacent batteries 1 and the negative tab 123 of the other one of the two adjacent batteries; and/or the edge part 21 of the first connecting piece 2 is in limit fit with the first opening 111 along the first direction, so that the first connecting piece 2 covers the first opening 111, and the edge part 21 of the first connecting piece 2 is fixed with two adjacent shells 11.

It should be noted that in the description of the present application, "and/or" is meant to include three parallel schemes, and taking "a and/or B" as an example, the scheme includes a scheme, or B scheme, or a scheme satisfied by both a and B. There are three schemes in total: 1. the first connecting piece 2 is fixedly connected with the positive tab 122 of one of the two adjacent batteries 1 and the negative tab 123 of the other one of the two adjacent batteries; 2. the edge part 21 of the first connecting piece 2 is in limit fit with the first opening 111 along the first direction, so that the first connecting piece 2 covers the first opening 111, and the edge part 21 of the first connecting piece 2 is fixed with two adjacent shells 11; 3. the first connecting piece 2 is fixedly connected with the positive tab 122 of one of the two adjacent batteries 1 and the negative tab 123 of the other one of the two adjacent batteries, and the edge portion 21 of the first connecting piece 2 is in limit fit with the first opening 111 along the first direction, so that the first connecting piece 2 blocks the first opening 111, and the edge portion 21 of the first connecting piece 2 is fixed with the two adjacent housings 11.

Wherein, the first connecting piece 2 is fixedly connected with both the positive tab 122 of one of the two adjacent batteries 1 and the negative tab 123 of the other one of the two adjacent batteries 1 (for example, the first connecting piece 2 can be connected by ultrasonic welding or laser welding, etc.), so as to ensure that the first connecting piece 2 is more stably arranged, and thus ensure the reliability of the electrical connection between the two adjacent batteries 1 through the first connecting piece 2. Edge portion 21 through first connection piece 2 is along the spacing cooperation in first opening 111 department of first direction, the equipment of first connection piece 2 and shell 11 has been made things convenient for, be convenient for follow-up first connection piece 2 and shell 11 fixed link to each other, simultaneously because edge portion 21 all is fixed (for example can link to each other for ultrasonic bonding or laser welding etc.) with two adjacent shells 11, make first connection piece 2 both can realize the spacing cooperation with shell 11 through edge portion 2, can realize again with shell 11 fixed, be convenient for simplify first connection piece 2's structure, further guarantee that first connection piece 2 sets up more firmly.

In some embodiments of the present invention, as shown in fig. 2, the winding core 12 further includes a first insulating member 124, the first insulating member 124 is disposed between the winding core main body 121 and the housing 11, and the first insulating member 124 wraps the winding core main body 121, so that the first insulating member 124 can separate the winding core main body 121 from the housing 11 to ensure the insulating effect between the winding core main body 121 and the housing 11, which is beneficial to improving the use safety of the battery 1. The battery assembly 100 further comprises a second insulating member 3, the second insulating member 3 is wrapped outside the first connecting pieces 2 and the plurality of batteries 1 to ensure the overall insulating property of the battery assembly 100, the use safety of the battery assembly 100 is further ensured, and the second insulating member 3 can protect the shell 11 to prevent the shell 11 from being corroded and the like, so that the service life of the battery assembly 100 is prolonged.

It can be seen that by providing the first insulating member 124 and the second insulating member 3, double insulation of the battery assembly 100 is facilitated, and the use safety of the battery assembly 100 is effectively improved.

Alternatively, the first insulating member 124 may be a PP (polypropylene) member, a PET (polyethylene terephthalate) member, a PI (polyimide) member, or the like; the second insulating member 3 may be a PET member, a PP member, or the like.

It is understood that when the first insulating member 124 and the second insulating member 3 are provided, the case 1 may be a metal member such as an aluminum member or the like in order to secure the performance of the battery assembly 100.

In some embodiments of the present invention, as shown in fig. 2 and 6, the first connecting piece 2 includes a first electrical connecting piece 22 and a second electrical connecting piece 23, the first electrical connecting piece 22 is fixed with the positive tab 122 of one of the two adjacent batteries 1 through the corresponding first opening 111, and the first electrical connecting piece 22 is electrically connected with the positive tab 122 through the corresponding first opening 111, the second electrical connecting piece 23 is electrically connected with the first electrical connecting piece 22, the second electrical connecting piece 23 is fixed with the negative tab 123 of the other one of the two adjacent batteries 1 through the corresponding first opening 111, and the second electrical connecting piece 123 is electrically connected with the negative tab 123 through the corresponding first opening 111, so as to ensure reliable electrical connection between the two adjacent batteries 1.

The first electrical connector 22 and the second electrical connector 23 are made of different materials, so that the battery assembly is suitable for use scenes with different materials of the positive tab 122 and the negative tab 123, and is beneficial to long-time current transmission, so that the working stability of the battery assembly 100 is ensured.

For example, the first electrical connection member 22 and the positive tab 122 are made of the same material, such as a copper member, and the second electrical connection member 23 and the negative tab 123 are made of the same material, such as an aluminum member, which facilitates welding and fixing between the first electrical connection member 22 and the positive tab 122 and between the second electrical connection member 23 and the negative tab 123, and improves electrical conductivity between two adjacent batteries 1, and simultaneously facilitates avoiding short circuit caused by melting of the positive tab 122 of one of the two adjacent batteries 1 or the negative tab 123 of the other of the two adjacent batteries 1 due to large current or large heat generated by long-time operation of the battery assembly 100, thereby improving safety of the battery assembly 100.

Alternatively, the second electrical connector 23 and the first electrical connector 22 may be fixedly connected by welding (e.g. friction welding), or composite plate bonding, etc. to ensure the electrical connection reliability of the first electrical connector 22 and the second electrical connector 23.

In other embodiments, the first electrical connector 22 is fixed and electrically connected to the negative tab 123 of one of the two adjacent batteries 1 through the corresponding first opening 111, and the second electrical connector 23 is fixed and electrically connected to the positive tab 123 of the other of the two adjacent batteries 1 through the corresponding first opening 111.

In some embodiments of the present invention, as shown in fig. 6 and 7, the first connection plate 2 further includes a fixed connection 24, the fixed connection 24 is formed with a mounting hole 2411, and the first electrical connection 22 and the second electrical connection 23 are both fitted in the mounting hole 2411, so as to facilitate the assembly of the first electrical connection 22 and the fixed connection 24, and facilitate the assembly of the second electrical connection 23 and the fixed connection 24; wherein, the fixed connecting member 24 has a rim portion 21, the rim portion 21 is disposed around the mounting hole 2411, so that the rim portion 21 is formed into an annular structure, the outer peripheral wall of the rim portion 21 has a boss portion 211, the boss portion 211 can protrude out of the outer peripheral wall of the rim portion 21, in the axial direction of the mounting hole 2411, two ends of the boss portion 211 are respectively in abutting fit with the edges of two adjacent first openings 111, and two ends of the boss portion 211 are respectively fixed with the edges of two adjacent first openings 111.

Therefore, by providing the boss portion 211, positioning fit of the first connecting piece 2 to the edge of the first opening 111 is facilitated, so as to realize positioning fit of the first connecting piece 2 and two adjacent shells 11 in the first direction, facilitate subsequent fixing of the first connecting piece 2 and two adjacent shells 11, and improve assembly efficiency of the battery assembly 100.

For example, as shown in fig. 9, the two adjacent batteries 1 are a first battery 5 and a second battery 6, respectively, the first battery 5 includes a first housing 51, the second battery 6 includes a second housing 61, the fixed connecting member 24 has a rim portion 21, the rim portion 21 is formed at both ends of the fixed connecting member 24, and the peripheral wall of the rim portion 21 has a boss portion 211, both ends of the boss portion 211 are respectively in abutting engagement with edges of the first housing 51 and the second housing 61 at the first opening 111 in the axial direction of the mounting hole 2411.

In some embodiments of the utility model, fixed connector 24 and first electric connector 22 and second electric connector 23 are moulded plastics fixedly, then realize fixed connector 24, first electric connector 22 and the fixed of second electric connector 23 in the technology of moulding plastics, have guaranteed that fixed connector 24 and first electric connector 22 are fixed reliable, and have guaranteed that fixed connector 24 and second electric connector 23 are fixed reliable, have made things convenient for the processing of first connecting piece 2 simultaneously.

In some embodiments of the present invention, as shown in fig. 6, the fixing connector 24 includes a third insulating member 241 and a metal member 242, a mounting hole 2411 is formed on the third insulating member 241, and a mounting groove 2412 is formed on the outer peripheral wall of the third insulating member 241, the mounting groove 2412 may be formed by partially recessing the outer peripheral wall of the third insulating member 241 along the radial direction of the mounting hole 2411, the metal member 242 is fitted in the mounting groove 2412, and in the radial direction of the mounting hole 2411, the outer end of the metal member 242 extends out of the mounting groove 2412 to form the edge portion 21.

It can be seen that the metal piece 242 is also formed in an annular structure, and in the radial direction of the mounting hole 2411, the third insulating piece 241 separates the metal piece 242 from the first electrical connector 22 and the second electrical connector 23 to achieve insulation between the metal piece 242 and the first electrical connector 22 and insulation between the metal piece 242 and the second electrical connector 23, and at the same time, the metal piece 242 has good structural strength, so as to ensure the use reliability of the fixed connector 24 and thus the use reliability of the first connector 2.

Optionally, the metal piece 242 is an aluminum piece.

In some embodiments, as shown in fig. 6 and 8, the first connection piece 2 includes a first electrical connector 22, a second electrical connector 23, and a fixed connector 24, the second electrical connector 23 is electrically connected to the first electrical connector 22, the fixed connector 24 includes a third insulating piece 241 and a metal piece 242, a mounting hole 2411 is formed on the third insulating piece 241, the first electrical connector 22 and the second electrical connector 23 are both fitted to the mounting hole 2411, a mounting groove 2412 is formed on an outer peripheral wall of the third insulating piece 241, the metal piece 242 is fitted to the mounting groove 2412, and an outer end of the metal piece 242 protrudes out of the mounting groove 2412 in a radial direction of the mounting hole 2411 to form a rim portion 21, an outer peripheral wall of the rim portion 21 has a boss portion 211, and both sides of the boss portion 211 are respectively fitted with rims of two adjacent housings 11 at the first opening 111 in the axial direction of the mounting hole 2411.

The third insulating member 241 is an injection molded member, for example, the third insulating member 241 may be a PPS (polyphenylene sulfide) member, a PET member, or the like; in the injection molding process of the third insulating member 241, the first electric connector 22, the second electric connector 23 and the metal member 242 are connected into a whole, so that the third insulating member 241 is injection-molded and fixed with the first electric connector 22, the second electric connector 23 and the metal member 242. The injection molding method of the third insulating member 241 may be nano injection molding or the like.

In some embodiments of the present invention, as shown in fig. 1 and fig. 2, the battery assembly 100 further includes a second connecting piece 4, in the first direction, the second openings 112 are respectively formed on the sides of the shells 11 of the two batteries 1 located at the two ends, which are away from each other, the negative tab 123 of one of the two batteries 1 located at the two ends and the positive tab 122 of the other one of the two batteries are exposed to the corresponding second opening 112, the second connecting piece 4 is located at the second opening 112 to shield the second opening 112, and the second connecting piece 4 is electrically connected to the positive tab 122 or the negative tab 123.

It can be seen that the second opening 112 is used for avoiding the electrical connection between the second connecting piece 4 and the positive tab 122 or the negative tab 123, so as to ensure that the electrical connection between the second connecting piece 4 and the positive tab 122 or the negative tab 123 is reliable, and meanwhile, it is convenient to ensure that the space where the winding core 12 is located has certain tightness, so as to achieve good dustproof and waterproof effects.

It is understood that, when the battery modules 100 are used in a battery module, the second connecting tabs 4 of adjacent battery modules 100 may be electrically connected correspondingly by a connecting member, such as a buss bar or the like, to achieve series or parallel connection of the adjacent battery modules 100.

In some embodiments of the present invention, as shown in fig. 2 and 9, the structure of the second connecting sheet 4 is the same as that of the first connecting sheet 2, which facilitates reducing the design cost and the processing cost of the battery assembly 100, facilitates mass production of the first connecting sheet 2 and the second connecting sheet 4, and the first connecting sheet 2 and the second connecting sheet 4 have good versatility.

For example, the second connecting piece 4 includes a first electrical connector 22, a second electrical connector 23 and a fixed connector 24, and the fixed connector 24 of the second connecting piece 4 includes a third insulating member 241 and a metal member 242, a mounting hole 2411 is formed on the third insulating member 241 of the second connecting piece 4, the first electrical connector 22 of the second connecting piece 4 and the second electrical connector 23 of the second connecting piece 4 are each fitted to the mounting hole 2411 of the second connecting piece 4, a mounting groove 2412 is formed on the outer peripheral wall of the third insulating member 241 of the second connecting piece 4, the metal member 242 of the second connecting piece 4 is fitted to the mounting groove 2412 of the second connecting piece 4, and in the radial direction of the mounting hole 2411 of the second connecting piece 4, the outer end of the metal member 242 of the second connecting piece 4 protrudes out of the mounting groove 2412 of the second connecting piece 4 to form the edge portion 21, the outer peripheral wall of the edge portion 21 of the second connecting piece 4 has a boss portion 211, in the axial direction of the mounting hole 2411 of the second connecting piece 4, one side of the boss portion 211 of the second connecting piece 4 is in abutting engagement with the edge of the case 11 of the battery 1 at the second opening 112 at one of the two ends of the battery assembly 100.

Alternatively, in the axial direction of the mounting hole 2411 of the second connecting sheet 4, one side of the boss portion 211 of the second connecting sheet 4 is in abutting fit with the edge of the housing 11 of the battery 1 at the second opening 112 at one of the two ends of the battery assembly 100, and the boss portion 211 of the second connecting sheet 4 is fixedly connected with the edge of the housing 11 at the second opening 112 by ultrasonic welding or laser welding, etc., so that the rigidity of the battery assembly 100 is improved, and the stability of the battery assembly 100 is improved.

According to the utility model discloses vehicle of second aspect embodiment, including the battery module, the battery module includes at least a set of group battery, and the group battery includes a plurality of battery pack 100 of arranging in proper order along the second direction, and battery pack 100 is according to the utility model discloses the above-mentioned battery pack 100 of first aspect embodiment, second direction and first direction are perpendicular.

When the battery module comprises a plurality of groups of battery packs, the plurality of groups of battery packs are arranged along a third direction, and the third direction is respectively vertical to the first direction and the second direction.

For example, when the first direction may be the front-rear direction shown in fig. 2, the second direction is the left-right direction, and the third direction is the up-down direction; or when the first direction may be the up-down direction shown in fig. 2, the second direction is the left-right direction and the third direction is the front-rear direction.

According to the utility model discloses the vehicle through adopting foretell battery pack 100, has reduced whole car dead weight, has improved the duration of vehicle.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "axial", "radial", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A battery assembly, comprising:

the battery comprises a plurality of batteries which are sequentially arranged along a first direction, each battery comprises a shell and a winding core, the winding core is arranged in the shell and comprises a winding core main body, a positive electrode lug and a negative electrode lug, the positive electrode lug and the negative electrode lug are respectively positioned at two sides of the winding core main body in the first direction, one sides of two adjacent shells facing each other are respectively provided with a first opening, and the positive electrode lug of one of the two adjacent batteries and the negative electrode lug of the other battery are oppositely arranged along the first direction and are exposed at the corresponding first opening;

the first connecting piece is electrically connected between the positive electrode tab of one of the two adjacent batteries and the negative electrode tab of the other one of the two adjacent batteries, and the first connecting piece is fixedly connected with the two adjacent outer shells respectively.

2. The battery pack according to claim 1, wherein a thickness direction of the first connecting piece is parallel to the first direction,

the first connecting piece is fixedly connected with the positive electrode tab of one of the two adjacent batteries and the negative electrode tab of the other battery; and/or the presence of a gas in the gas,

the edge part of the first connecting piece is in limit fit with the first opening along the first direction, so that the first connecting piece covers the first opening, and the edge part of the first connecting piece is fixed with the two adjacent shells.

3. The battery assembly of claim 1, wherein the jelly roll further comprises a first insulator disposed between the jelly roll body and the outer can and surrounding the jelly roll body,

the battery assembly further includes:

a second insulating member wrapping the first connection tab and the plurality of batteries.

4. The battery assembly of claim 1, wherein the first connection tab comprises:

the first electric connecting piece is fixedly and electrically connected with the positive lug of one of the two adjacent batteries through the corresponding first opening;

a second electrical connector electrically connected to the first electrical connector, the second electrical connector being fixed to and electrically connected to the negative tab of the other of the two adjacent batteries through the corresponding first opening, the first and second electrical connectors being of different materials.

5. The battery assembly of claim 4, wherein the first connecting tab further comprises:

fixed connector, fixed connector is formed with the mounting hole, first electric connector with second electric connector all cooperate in the mounting hole, fixed connector has the edge portion, the edge portion centers on the mounting hole sets up, just the periphery wall of edge portion has boss portion in the axial of mounting hole, boss portion's both ends respectively with adjacent two first open-ended border end to support the cooperation and with adjacent two first open-ended border is all fixed.

6. The battery assembly of claim 5, wherein the fixed connector is injection molded with the first and second electrical connectors.

7. The battery assembly of claim 5, wherein the fixed connection comprises:

a third insulating member on which the mounting hole is formed and of which an outer circumferential wall is formed with a mounting groove;

the metal piece is matched with the mounting groove, and in the radial direction of the mounting hole, the outer end of the metal piece extends out of the mounting groove to form the edge portion.

8. The battery assembly of any of claims 1-7, further comprising:

the second connecting piece is located two at both ends in the first direction one side that the shell deviates from each other of battery is formed with the second opening respectively, is located two at both ends one of them in the battery negative pole ear and another positive pole ear expose and correspond the second opening part, the second connecting piece is located second opening department is in order to shelter from the second opening, and with positive pole ear or negative pole ear electricity is connected.

9. The battery pack of claim 8, wherein the second connecting tab has the same structure as the first connecting tab.

10. A vehicle, characterized by comprising a battery module, wherein the battery module comprises at least one battery pack, the battery pack comprises a plurality of battery assemblies which are sequentially arranged along a second direction, the battery assemblies are according to any one of claims 1-9, and the second direction is perpendicular to the first direction.

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