CN210129545U

CN210129545U - Battery module and battery pack

Info

Publication number: CN210129545U
Application number: CN201921216073.9U
Authority: CN
Inventors: 李建伟; 杨明平; 王鹏; 周灵刚
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2019-07-30
Filing date: 2019-07-30
Publication date: 2020-03-06
Anticipated expiration: 2029-07-30

Abstract

The utility model discloses a battery module and battery package, battery module includes: the battery pack comprises a plurality of single batteries arranged in an array, each single battery comprises a top cover, a first pole and a second pole, the first pole is communicated with the top cover, the second pole is insulated from the top cover, and the top cover of each single battery is provided with more than one first electric connection part; and the circuit board comprises a circuit board body, the projection of the circuit board body on the surface of the top cover passes through at least part of the first electric connection part, a second electric connection part corresponding to the first electric connection part is arranged on the circuit board body, and the circuit board is electrically connected with the first electric connection part of at least part of the single batteries through the second electric connection part. According to the utility model discloses battery module, the position that first position of first utmost point post is compared to the position of first electric connection portion on the top cap is more nimble to make things convenient for arranging of circuit board, can simplify the extension route of circuit board, solve battery module inner space's wiring problem better.

Description

Battery module and battery pack

Technical Field

The utility model relates to a battery field, concretely relates to battery module and battery package.

Background

With the development of new energy industry, the requirements of the market on the safety performance and the cost of the single battery are increasingly increased. In the safety management technology of the Battery, the sampling technology of the single Battery is the basis of the strategy implementation of the whole Battery Management System (BMS), and once the sampling fails, the whole Battery system loses the working capacity.

In the current battery module, the circuit board is connected with the confluence piece to adopt the voltage of the single battery, however, the position of the confluence piece corresponds to the electrode pole of the single battery, namely, the confluence piece is positioned at two ends of the top cover of the single battery. Considering battery module's security, the explosion-proof valve in monomer battery top cap center still need be avoided in the arrangement of circuit board for the circuit board needs set up to the forked structure can only realize being connected with the piece that converges at the both ends of monomer battery top cap. The circuit board structure of the bifurcation structure in the prior art is more complex, and the material utilization rate is lower.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery module and battery package improves the material utilization ratio that is used for the circuit board of sampling.

On the one hand, the embodiment of the utility model provides a battery module, it includes: the battery pack comprises a plurality of single batteries arranged in an array, each single battery comprises a top cover, a first pole and a second pole, the first pole is communicated with the top cover, the second pole is insulated from the top cover, and the top cover of each single battery is provided with more than one first electric connection part; and the circuit board comprises a circuit board body, the projection of the circuit board body on the surface of the top cover passes through at least part of the first electric connection part, a second electric connection part corresponding to the first electric connection part is arranged on the circuit board body, and the circuit board is electrically connected with the first electric connection part of at least part of the single batteries through the second electric connection part.

According to the utility model discloses an aspect, a plurality of battery cells of group battery arrange for more than one, and in every single cell, every battery cell's at least one first electric connection is located same virtual straight line.

According to one aspect of the embodiment of the present invention, the single battery further includes an explosion-proof valve, the explosion-proof valve is located on the top cover, and the first pole and the second pole are respectively located at two sides of the explosion-proof valve; the top cover is provided with more than one first electric connection part between the explosion-proof valve and the first pole column, and/or the top cover is provided with more than one first electric connection part between the explosion-proof valve and the second pole column.

According to the utility model discloses an aspect, every battery cell's top cap is equipped with two first electric connections, and two first electric connections are in the mutual symmetry setting in explosion-proof valve both sides.

According to the utility model discloses an aspect, the circuit board still includes the connector, and this body coupling of connector and circuit board, second electricity connection portion are connected with the connector electricity.

According to an aspect of the embodiment of the present invention, the plurality of single batteries of the battery pack are arranged in more than one row, and each row of single batteries is provided with more than one circuit board; the circuit board body comprises a first unit and a second unit which are connected with each other, the second electric connection part is arranged on the first unit, the connector is connected with the second unit, and the first unit covers more than one first electric connection part of each single battery in the corresponding row.

According to the utility model discloses an aspect, the circuit board still includes the connection piece, connection piece and this body coupling of circuit board to be connected with the connector electricity, the connection piece can be connected with the second pole electricity of a battery cell among a plurality of battery cells.

According to the utility model discloses an aspect, battery module still includes: and the plurality of confluence pieces are connected with the first poles and/or the second poles of the plurality of single batteries so as to connect the plurality of single batteries in series and/or in parallel, and the connecting piece is connected with the second poles of the single batteries through the confluence pieces.

According to the utility model discloses an aspect, has concatenated resistance between connection piece and the connector.

On the other hand, the embodiment of the utility model provides a battery pack, it includes: the battery module according to any one of the above embodiments; and the circuit board of the battery module is electrically connected with the battery management system module.

According to the utility model discloses battery module, every battery cell's first utmost point post switches on with the top cap in the group battery, and second utmost point post is insulating with the top cap, is equipped with first electric connection portion on the top cap. The circuit board is connected with the first electric connecting part of the single battery through the second electric connecting part, so that the circuit board is electrically connected with the first pole of the single battery, and the voltage information of the first pole is sampled. The position of first electric connection portion on the top cap is more nimble than the position of first utmost point post to make things convenient for arranging of circuit board, can simplify the extension route of circuit board, solve battery module inner space's wiring problem better.

In addition, the circuit board is connected through the first electric connection part with the top cap and realizes the sampling to first utmost point post voltage information for at least part of circuit board body can attach in monomer battery's top cap, reduces the unsettled part of circuit board, improves the stability and the security of battery module internal wiring. In the conventional battery module, the circuit board is electrically connected with the first pole through the confluence piece, so that the height difference is formed between the circuit board and the top cover of the main body part of the single battery. The utility model discloses among the battery module, the circuit board body can be attached in battery cell's top cap, has eliminated the difference in height of circuit board and top cap to eliminate safety problem, the stable connection problem side effect such as that this difference in height arouses, improve battery cell in groups volume energy density simultaneously, be favorable to automated production.

Drawings

Other features, objects and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings, in which like or similar reference characters identify the same or similar features.

Fig. 1 shows a perspective view of a battery module according to an embodiment of the present invention;

fig. 2 shows a top view of a battery module according to an embodiment of the present invention;

fig. 3 is a top view of a battery module with a circuit board hidden according to an embodiment of the present invention;

fig. 4 is a perspective view illustrating a unit cell in a battery module according to an embodiment of the present invention;

fig. 5 is a perspective view illustrating a circuit board in a battery module according to an embodiment of the present invention.

In the figure:

1-a battery module;

a BP-battery pack;

11-a single cell; 111-a top cover; EC1 — first electrical connection; 112-a first pole; 113-a second pole; 114-an explosion-proof valve;

12-a circuit board; 121-a circuit board body; 121 a-first unit; 121 b-a second unit; EC2 — second electrical connection; 122-a connector; 123-connecting pieces; 124-resistance;

VL-virtual straight line.

Detailed Description

The features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention.

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

It will be understood that when a layer, region or layer is referred to as being "on" or "over" another layer, region or layer in describing the structure of the component, it can be directly on the other layer, region or layer or intervening layers or regions may also be present. Also, if the component is turned over, one layer or region may be "under" or "beneath" another layer or region.

An embodiment of the utility model provides a battery module and battery package, wherein the battery package can include battery module and battery management System module (Bttery Mngement System, BMS), and BMS is used for managing battery module and inside battery cell, detects battery module and inside battery cell's operating condition.

Hereinafter, a battery module according to some alternative embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 and 2 respectively show a perspective view and a top view of a battery module according to an embodiment of the present invention. A battery module 1 includes a battery pack BP and a circuit board 12. Fig. 3 shows a top view of the battery module with the circuit board hidden according to the embodiment of the present invention.

The battery pack BP includes a plurality of unit cells 11 arranged in an array, and fig. 4 is a perspective view of the unit cells in the battery module according to the embodiment of the present invention. Each unit cell 11 includes a top cap 111, a first pole post 112, and a second pole post 113. The first pole 112 is conducted with the top cover 111, and the second pole 113 is insulated from the top cover 111. Wherein the top cover 111 of each unit cell 11 is provided with one or more first electrical connection portions EC 1.

In some embodiments, the body of the top cover 111 is a conductive structure, at least a portion of the surface of which is covered with an insulating film, wherein the insulating film may cover the top surface of the body of the top cover 111. The insulating film covering the top surface of the body of the top cover 111 may be provided with an opening so that the body of the top cover 111 of the opening portion is exposed, thereby forming the first electrical connection portion EC 1.

Fig. 5 is a perspective view illustrating a circuit board in a battery module according to an embodiment of the present invention. The circuit board 12 includes a circuit board body 121, and a projection of the circuit board body 121 on the surface of the top cover 111 passes through at least a part of the first electrical connection portion EC 1. The circuit board body 121 is provided with a second electrical connection portion EC2 corresponding to the position of the first electrical connection portion EC1, and the circuit board 12 is electrically connected with the first electrical connection portion EC1 of at least some of the unit batteries 11 through the second electrical connection portion EC 2.

Types of the Circuit Board 12 include, but are not limited to, a Flexible Circuit Board (FPC), a Printed Circuit Board (PCB), and the second electrical connection portion EC2 may be a land provided on a surface of the Circuit Board body 121. The second electrical connection portion EC2 may be fixed and electrically connected to the first electrical connection portion EC1 by welding.

According to the utility model discloses battery module 1, circuit board 12 is connected with the first electric connecting part EC1 electricity of battery cell 11 through second electric connecting part EC2 for circuit board 12 is connected with the electricity of battery cell 11's first utmost point post 112, realizes the sampling to first utmost point post 112 voltage information. The position of the first electrical connection portion EC1 on the top cover 111 is more flexible than the position of the first pole 112, so that the arrangement of the circuit board 12 is facilitated, the extending path of the circuit board 12 can be simplified, and the problem of wiring in the internal space of the battery module 1 is better solved.

In addition, the circuit board 12 is connected with the first electrical connection portion EC1 of the top cover 111 to realize sampling of the voltage information of the first terminal post 112, so that at least part of the circuit board body 121 can be attached to the top cover 111 of the single battery 11, the suspension portion of the circuit board 12 is reduced, and the stability and the safety of the internal wiring of the battery module 1 are improved.

In the conventional battery module, the circuit board 12 is electrically connected to the first terminal post 112 through the bus bar, so that a height difference exists between the circuit board 12 and the top cover 111 of the main body of the single battery 11, the number of the bus bar is multiple, and the height differences between the multiple bus bars and the top cover 111 are not completely equal. The height difference has adverse effect on the safety of the sampling connection structure of the single battery, and in order to reduce the adverse effect and meet the requirement of automatic manufacture in the traditional battery module manufacturing process, even more complex connection processes such as a bonding process and the like need to be adopted.

The utility model discloses in battery module 1, circuit board body 121 can attach in battery cell 11's top cap 111, has eliminated the difference in height of circuit board 12 with top cap 111 to eliminate safety problem, the side effect such as stable connection problem that this difference in height arouses, improve battery cell 11 ganged volume energy density simultaneously, be favorable to automated production.

In some embodiments, the plurality of unit cells 11 of the battery pack BP are arranged in one or more columns, and in each column of unit cells 11, at least one first electrical connection portion EC1 of each unit cell 11 is located on the same virtual straight line VL. The extending direction of the virtual straight line VL can be set according to the design layout of the battery module 1, for example, in some embodiments, the extending direction of the virtual straight line VL is parallel to the column direction of the single batteries 11.

In each row of single cells 11, the at least one first electrical connection EC1 of each single cell 11 lies on the same virtual straight line VL, i.e. in each row of single cells 11, each single cell 11 provides at least one first electrical connection EC1, these first electrical connections EC1 being provided in a collinear arrangement. According to the above structure, at least a part of the unit circuit board body 121 may be in a band shape extending parallel to the virtual straight line VL, that is, the first electrical connection portion EC1 covering each unit cell 11 in the row is realized, the electrical connection with the first pole 112 of each unit cell 11 in the row is realized, and the structure and the extending path of the circuit board 12 are simplified.

In some embodiments, the single battery 11 further includes an explosion-proof valve 114, the explosion-proof valve 114 is located on the top cover 111, and the first terminal post 112 and the second terminal post 113 are respectively disposed on two sides of the explosion-proof valve 114 in any direction. For example, in some embodiments, the explosion-proof valve 114 is located in the center of the top cover 111, and the first pole column 112 and the second pole column 113 are respectively arranged on two sides of the explosion-proof valve 114 in a direction perpendicular to the column direction of the single batteries 11.

The top cover 111 is provided with one or more first electrical connections EC1 between the explosion-proof valve 114 and the first pole 112, and/or the top cover 111 is provided with one or more first electrical connections EC1 between the explosion-proof valve 114 and the second pole 113. In the present embodiment, the top cover 111 of each unit cell 11 is provided with two first electrical connection portions EC1, and the two first electrical connection portions EC1 are symmetrically disposed with respect to each other on both sides of the explosion-proof valve 114. In each row of the unit cells 11, all the first electrical connection portions EC1 are divided into two groups, one of which is located on one side of the explosion-proof valve 114, and the other of which is located on the other side of the explosion-proof valve 114. The plurality of first electrical connections EC1 within each set of first electrical connections EC1 are respectively collinear, and the circuit board body 121 may be disposed on any one of the sets of first electrical connections EC1, or in some embodiments, the circuit board body 121 may be disposed on both sets of first electrical connections EC1 simultaneously.

In some embodiments, the circuit board 12 further includes a connector 122 for electrically connecting the circuit board 12 with the BMS. The connector 122 is connected with the circuit board body 121, and the second electrical connection part EC2 is electrically connected with the connector 122, so that the BMS can sample the first poles 112 of the plurality of unit batteries 11.

As shown in fig. 1 to 3, a plurality of unit cells 11 of the battery pack BP are arranged in more than one row, and each row of unit cells 11 is provided with more than one circuit board 12. As shown in fig. 1, 2 and 5, the circuit board body 121 includes a first cell 121a and a second cell 121b connected to each other, the second electrical connection portion EC2 is provided to the first cell 121a, and the connector 122 is connected to the second cell 121 b. Wherein the first cell 121a covers one or more first electrical connections EC1 of each unit cell 11 of the corresponding column, and in some embodiments, the first cell 121a extends in a band shape.

In some embodiments, the circuit board 12 further includes a connection pad 123, and the connection pad 123 is connected to the circuit board body 121 and electrically connected to the connector 122. The connection pad 123 may be a metal sheet, an FPC structure, or the like, for example, a nickel sheet, an aluminum foil. The connection tab 123 can be electrically connected with the second pole 113 of one of the plurality of unit cells 11.

In some embodiments, the first terminal post 112 of the single battery 11 is a positive terminal post, and the second terminal post 113 is a negative terminal post. The plurality of unit cells 11 of each row of unit cells 11 are connected in series and/or in parallel with each other to form a battery unit having a main positive electrode and a main negative electrode. The circuit board 12 is electrically connected to the positive electrodes of the respective unit batteries 11 in the battery unit through the first electrical connection portion EC1 connecting the plurality of unit batteries 11. The tab 123 can be electrically connected to the second pole 113 of one cell 11, wherein the tab 123 can be electrically connected to the second pole 113, which is defined as the primary negative pole of the cell, to make an electrical connection to the primary negative pole of the cell.

In some embodiments, the battery module 1 further includes a plurality of bus bars 13, and the plurality of bus bars 13 are connected with the first poles 112 and/or the second poles 113 of the plurality of unit batteries 11 to connect the plurality of unit batteries 11 in series and/or in parallel. Wherein the connection piece 123 is connected to the second pole 113 of the unit cell 11 through the bus bar 13. In some embodiments, the plurality of bus bars 13 includes a bus bar 13 connected to the first terminal post 112 defined as the main positive electrode of the battery cell; a bus bar 13 may be included that is connected to the second pole 113, which is defined above as the primary negative pole of the cell, and the tab 123 is connected to the bus bar 13 that is connected to the primary negative pole of the cell.

In some embodiments, the first terminal post 112 of the single battery 11 is indirectly electrically connected to the top cover 111, wherein the first terminal post 112 is electrically connected to the top cover 111 through a Fuse (Fuse) structure, so that a Fuse resistance exists between the first terminal post 112 and the top cover 111. The resistance of the fuse resistor varies according to the design of the individual battery 11.

In some embodiments, a resistor 124 is connected in series between the connecting pad 123 and the connector 122.

Each row of the single batteries 11 are interconnected to form a battery unit, the circuit board 12 is connected with the positive electrodes of the plurality of single batteries 11 through a first electric connection part EC1 connecting the plurality of single batteries 11, wherein a fuse resistor exists between the connector 122 and the positive electrode of each single battery 11; the tab 123 is electrically connected to the second post 113, which defines the primary negative pole of the cell, to make an electrical connection to the primary negative pole of the cell.

The connector 122 connects the circuit board 12 with the BMS to obtain a sampling circuit, and the sampling circuit can eliminate the influence of the fuse resistance on the accurate information of the positive electrode of each battery cell by correction. Because the resistor 124 is connected in series between the connecting sheet 123 and the connector 122, and the resistance value of the resistor 124 corresponds to the resistance value of the fuse resistor, the sampling circuit is convenient to correct the positive electrode of each single battery 11 and the main negative electrode of the battery unit at the same time, so as to obtain more accurate voltage sampling data.

The embodiment of the utility model provides a still provide a battery pack, it can include battery module 1 and the BMS of above-mentioned arbitrary embodiment, and wherein battery module 1's circuit board 12 is connected with the BMS electricity to the realization is to battery module 1's information sampling and battery management.

According to the utility model discloses battery pack, the first utmost point post 112 of every battery cell 11 switches on with top cap 111 in the group battery BP of battery module 1, and second utmost point post 113 is insulating with top cap 111, is equipped with first electric connection portion EC1 on top cap 111. The circuit board 12 is electrically connected with the first electrical connection portion EC1 of the single battery 11 through the second electrical connection portion EC2, so that the circuit board 12 is electrically connected with the first pole 112 of the single battery 11, and the voltage information of the first pole 112 is sampled. The position of the first electrical connection portion EC1 on the top cover 111 is more flexible than the position of the first pole 112, so that the arrangement of the circuit board 12 is facilitated, the extending path of the circuit board 12 can be simplified, and the problem of wiring in the inner space of the battery module 1 is better solved.

In accordance with the embodiments of the present invention as set forth above, these embodiments do not set forth all of the details nor limit the invention to the specific embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and its various embodiments with various modifications as are suited to the particular use contemplated. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A battery module (1), characterized by comprising:

the Battery Pack (BP) comprises a plurality of single batteries (11) which are arranged in an array, each single battery (11) comprises a top cover (111), a first pole (112) and a second pole (113), the first pole (112) is communicated with the top cover (111), the second pole (113) is insulated from the top cover (111), and more than one first electric connecting part (EC1) is arranged on the top cover (111) of each single battery (11); and

the circuit board (12) comprises a circuit board body (121), the projection of the circuit board body (121) on the surface of the top cover (111) passes through at least part of the first electric connecting part (EC1), a second electric connecting part (EC2) corresponding to the first electric connecting part (EC1) is arranged on the circuit board body (121), and the circuit board (12) is electrically connected with at least part of the first electric connecting part (EC1) of the single battery (11) through the second electric connecting part (EC 2).

2. The battery module (1) according to claim 1, wherein the plurality of the unit cells (11) of the Battery Pack (BP) are arranged in one or more rows, and in each row of the unit cells (11), at least one of the first electrical connection portions (EC1) of each unit cell (11) is located on the same virtual straight line (VL).

3. The battery module (1) according to claim 1, wherein the single battery (11) further comprises an explosion-proof valve (114), the explosion-proof valve (114) is located on the top cover (111), and the first pole column (112) and the second pole column (113) are respectively arranged on two sides of the explosion-proof valve (114);

the top cover (111) is provided with one or more first electrical connections (EC1) between the explosion-proof valve (114) and the first pole (112), and/or the top cover (111) is provided with one or more first electrical connections (EC1) between the explosion-proof valve (114) and the second pole (113).

4. The battery module (1) according to claim 3, wherein the top cover (111) of each of the unit cells (11) is provided with two of the first electrical connection portions (EC1), the two first electrical connection portions (EC1) being disposed symmetrically with each other on both sides of the explosion-proof valve (114).

5. The battery module (1) according to claim 1, wherein the circuit board (12) further comprises a connector (122), the connector (122) being connected with the circuit board body (121), the second electrical connection portion (EC2) being electrically connected with the connector (122).

6. The battery module (1) according to claim 5, wherein the plurality of single batteries (11) of the Battery Pack (BP) are arranged in more than one row, and each row of the single batteries (11) is provided with more than one circuit board (12); the circuit board body (121) includes a first unit (121a) and a second unit (121b) connected to each other, the second electrical connection portion (EC2) is provided to the first unit (121a), the connector (122) is connected to the second unit (121b),

wherein the first cell (121a) covers one or more of the first electrical connection portions (EC1) of each of the unit cells (11) in a corresponding row.

7. The battery module (1) according to claim 5, wherein the circuit board (12) further comprises a connection tab (123), the connection tab (123) being connected with the circuit board body (121) and electrically connected with the connector (122), the connection tab (123) being electrically connectable with the second pole (113) of one of the plurality of unit cells (11).

8. The battery module (1) according to claim 7, wherein the battery module (1) further comprises:

a plurality of confluence pieces (13) connected with the first poles (112) and/or the second poles (113) of the single batteries (11) to connect the single batteries (11) in series and/or in parallel, wherein the connection pieces (123) are connected with the second poles (113) of the single batteries (11) through the confluence pieces (13).

9. The battery module (1) according to claim 7, wherein a resistor (124) is connected in series between the connection tab (123) and the connector (122).

10. A battery pack, comprising:

the battery module (1) according to any one of claims 1 to 9; and

the battery management system module is electrically connected with a circuit board (12) of the battery module (1).