WO2018015038A1

WO2018015038A1 - Battery module

Info

Publication number: WO2018015038A1
Application number: PCT/EP2017/061378
Authority: WO
Inventors: Dennis Berner
Original assignee: Volkswagen Aktiengesellschaft
Priority date: 2016-07-18
Filing date: 2017-05-11
Publication date: 2018-01-25
Also published as: DE102016213081B4; DE102016213081A1

Abstract

The invention relates to a battery module (1) comprising a number of n battery cells (BZ1-BZ12). Each battery cell (BZ1-BZ12) has a plus pole (P+) and a minus pole (P-), and the battery cells (BZ1-BZ12) are arranged parallel to one another such that first poles of all of the battery cells (BZ1-BZ12) are arranged along a first row (R1), and second poles of all the battery cells (BZ1-BZ12) are arranged along a second row (R2), wherein the poles of the battery cells (BZ1-BZ12) in each row (R1, R2) are different and alternate according to a specified pattern, and the poles of different battery cells (BZ1-BZ12) are connected together by pole connectors (7, 7.1-7.20). The external connections (3, 4) for the plus pole and the minus pole of the battery module (1) are led out to an end face (5) of the battery module (1), and at least the pole connectors (7.2-7.5, 7.8-7.11; 7.15, 7.18, 7.19) which connect only the inner battery cells (BZ2-BZ11) are U-shaped or comb-shaped. A pole of a battery cell is contacted via limbs (S1, S2) of the U-shaped pole connecters or teeth (Z) of the comb-shaped pole connectors, and the spacing of the limbs (S1, S2) or teeth (Z) is selected such that at least one pole of an adjacent battery cell is skipped.

Description

description

battery module

The invention relates to a battery module.

Battery modules usually have a number of n battery cells, each

Battery cell has a positive pole and a negative pole. It is known that

To arrange battery cells parallel to each other, so that first poles of all battery cells are arranged along a first row and second poles of all battery cells are arranged along a second row, wherein the poles of the battery cells are different in a row and alternate according to a predetermined pattern. For example, the polarity of the poles in a row alternates in a series connection of the battery cells, in which case the poles of different battery cells are interconnected by pole connectors. In the case of series connection then the pole connector can be formed as a short rectangular pole connector, which is very favorable in terms of losses. In the simplest case, however, then lie the outer or external terminals of the battery module on opposite end faces. This is partly disadvantageous, since then depending on the length of the battery module, the external connections are located at different distances. This must then be taken into account when planning the lines to be connected. Therefore, it is often desirable that the external connections are on the same front side. For this purpose, a connection must be returned via a pole connector from one end face to the other end face.

This pole connector is compared to other Polverbindern very long, resulting in

Stability problems in the attachment as well as large voltage drops and a

leads to uneven temperature distribution in the battery module.

The invention is based on the technical problem of improving such a battery module in which the external connections are arranged on the same end face.

The solution of the technical problem results from a battery module with the features of claim 1. Further advantageous embodiments of the invention will become apparent from the dependent claims.

The battery module comprises a number of n battery cells, each battery cell having a positive pole and a negative pole, wherein the battery cells are arranged parallel to one another are such that first poles of all battery cells are arranged along a first row and second poles of all battery cells are arranged along a second row. The polarities of the poles of the battery cells are different in a row and alternate according to a predetermined pattern, the poles of different battery cells through

Pole connectors are interconnected. The external connections for the positive pole and the negative pole of the battery module are led out to one end of the battery module. In this case, at least the pole connectors connecting only the inner battery cells are U-shaped or comb-shaped, wherein a pole of a battery cell is contacted via legs of the U-shaped pole connectors or tines of the comb-shaped pole connectors, wherein the spacing of the legs or tines is selected such that at least a pole of an adjacent battery cell is skipped. The inner battery cells are the battery cells, which are not arranged directly on the front side. Preferably, in each case exactly one pole is skipped. This allows the deviations in the lengths of the pole connectors to be reduced, which in turn leads to uniform voltage drops and temperature distributions. Also, the length of the longest pole connector is one over the whole

Battery module recirculating pole connector reduced, which also simplifies the mechanical attachment. By the U-shaped or comb-shaped pole connector, the contacting of the battery cells is not carried out in one pass from one end face to the other, but in two passes, namely from one end face to the other and back again. The number n of the battery cells is preferably greater than 6 and may in principle be even or odd.

However, it has been found that the advantages of the invention are particularly effective for a number of n = 12 or multiples of 12.

In one embodiment, the battery cells are connected as a pure series circuit, wherein the pattern is a modulo-4 pattern, wherein the two outer poles of the four battery cells in a row have the same polarity and the two inner poles in the row have the same polarity, the polarity of the outer and inner poles being different.

In a further embodiment, the pole connectors connecting only the inner battery cells or poles are U-shaped, wherein a pole connector to an external terminal L- or double-L-shaped and a pole connector at the external terminals opposite end face is rectangular. Preferably are with

Exception of these two pole connector all other pole connector U-shaped. In an alternative embodiment, the battery cells are connected as a 2-p series circuit in which two battery cells are connected in parallel, in which case the

Parallel circuits are connected in series, wherein the pattern is a modulo-8 pattern, wherein the two outer battery cells in a row of the modulo-8 pattern have the same polarity, wherein the polarity inwardly alternated, so that the two innermost battery cells in a Row have the same polarity.

In a further embodiment, only the inner battery cells or poles are

connecting pole connector comb-shaped, wherein a pole connector to an external terminal as a combined U-shaped and L- or double-L-shaped pole connector and a pole connector on the external terminals opposite end face is formed rectangular. Preferably, with the exception of these two pole connectors, all other pole connectors are comb-shaped.

The invention will be explained in more detail below with reference to preferred embodiments. The figures show:

Fig. 1 shows a battery module with a 1 p series connection with U-shaped

terminal connectors,

Fig. 2 shows a battery module with a 2 p series connection with comb-shaped

terminal connectors,

Fig. 3 shows a battery module with a 1 p series connection (prior art) and

Fig. 4 shows a battery module with a 2 p series connection (prior art).

Before the embodiments according to the invention are described, the state of the art will first be explained in more detail with reference to FIGS. 3 and 4.

FIG. 3 shows a battery module 1 with twelve battery cells BZ1 -BZ12, the battery cells BZ1 -BZ12 being arranged parallel to one another in a housing 2. The

Battery module 1 has two external terminals 3, 4, on which the positive pole and the negative terminal of the battery module 1 is applied. In this case, the two external terminals 3, 4 are arranged on the same end face 5. The battery cells BZ1 -BZ12 each have a positive pole P + and a negative pole P-. In this case, first poles of the battery cells BZ1 -BZ12 along a first Row R1 arranged and arranged the second poles of the battery cells BZ1 -BZ12 along a second row R2. The polarities of the poles alternate in a row R1, R2. Thus, the positive pole P + of the first battery cell BZ1 is in the first row R1, whereas of the second battery cell BZ2 is the negative pole P- in the first row R1.

Poles of different battery cells BZ1 -BZ12 are connected to each other via pole connector 7, wherein in each case one pole of a battery cell with a pole of an adjacent

Battery cell is connected so that the battery cells BZ1-BZ12 are interconnected in series. In this case, the positive terminal P + of the first battery cell BZ1 is connected to the external terminal 3 of the battery module 1 via a pole connector 7.

Via a pole connector 7, the negative pole P of the twelfth battery cell BZ12 is connected to the external terminal 4 of the battery module 1. In this case, this pole connector is L-shaped, which extends over the entire length of the battery module 1. All other pole connector 7, however, are rectangular in shape and relatively short. This leads to different voltage drops across the rectangular pole connectors 7 and the L-shaped pole connector 7. The temperature distribution is also uneven. Another problem is the mechanical attachment of such a long pole connector 7. In this case, the pole connector 7 from the negative terminal P- the twelfth battery cell BZ12 to the external terminal 4 may also be formed as a double-L-shaped pole connector.

4, a battery module 1 is shown, in which the twelve battery cells BZ1 -BZ12 are shown in a 2 p-circuit. In a 2-p circuit, battery cells are connected in parallel and the parallel circuits are connected in series. Here are the

Battery cells BZ1 -BZ12 compared to Fig. 3 arranged slightly differently. The first two battery cells BZ1 and BZ2 are arranged such that in each case the two positive poles P + are in the first row R1, in which case the next two battery cells BZ3 and BZ4 lie with their negative poles P- in the first row. Then the pattern repeats. This represents a modulo-4 pattern since the pattern repeats after four battery cells BZ. The pole connector 7 are formed predominantly rechteckformig and extend over four poles each. The pole connector 7, which connects the two positive poles P + of the first two battery cells BZ1, BZ2, is also rectangular in shape and additionally connects the two positive poles P + to the external terminal 3. The two negative poles P- of the two last battery cells BZ1 1, BZ12 are then via a double-L-shaped pole connector 7 to the external terminal 4 for the negative pole of the battery module 1 out. Again, the same problems arise as in the 1 p interconnection of FIG. 3. 1 shows a battery module 1 according to the invention, the battery cells BZ1 -BZ12 being arranged in the housing 2 in such a way that a modulo 4 pattern arises again, but the poles of the two outer battery cells are the same and the two inner poles are the same, the outer and inner poles are different. to

Clarification: The modulo 4 pattern in the first row R1 is for the first four

Battery cells BZ1 -BZ4 P-; P +; P +; P-, i. the polarity of the two outer battery cells BZ1 and BZ4 is equal to (P-) and the polarity of the two inner battery cells BZ2 and BZ3 is equal to (P +), the polarity of the inner and outer battery cells in the R1 series being different.

The battery cells BZ1 -BZ12 are again connected via pole connector 7.1-7.13. In this case, with the exception of the pole connector 7.7, which is arranged on the external terminals 3, 4 opposite end face 6, and the pole connector 7.13 all other pole connector 7.1-7.6 and 7.8-7.12 U-shaped. In particular, at least all inner (only the inner battery cells BZ2 - BZ1 1 connecting pole connector) pole connector 7.2-7.5 and 7.8-7.1 1 U-shaped. In this case, the U-shaped pole connectors are arranged such that their legs S1, S2 connect one pole of a battery cell and the base B, which connects the two legs S1, S2, to a pole of a battery cell

is passed so that this pole is skipped. This should be exemplified by the

Polverbinders 7.8 are explained. The leg S1 contacts the positive pole P + the

Battery cell BZ9 and the leg S2 contacts the negative pole P of the battery cell BZ1 1, wherein the two poles are connected via the base B, wherein the negative pole of the battery cell BZ10 is skipped.

The basic principle is therefore not to connect in one pass all the poles of the battery cells BZ1 -BZ12 from one end face 5 to the opposite end face 6 with each other and then return the last pole via an extremely long pole connector 7, but the

Contacting process to realize by two runs, this is usually skipped a pole.

In the example shown, the positive pole P + of the second battery cell BZ2 is connected to the external terminal 3 via the pole connector 7.1. Via the pole connector 7.2, the negative pole P of the second battery cell BZ2 is connected to the positive pole P + of the fourth battery cell BZ4. About the pole connector 7.3, the negative terminal P- of the fourth battery cell BZ4 is connected to the positive terminal P + of the sixth battery cell BZ6 and so on, as finally the Polverbinder 7.6 the positive pole P + of the twelfth battery cell BZ12 contacted. This represents the first pass, after which the connection between the battery cells is routed back. The pole connector 7.7 connects the negative pole P of the twelfth battery cell BZ12 to the positive pole P + of the eleventh battery cell BZ1. The negative pole P- of the eleventh battery cell BZ1 1 is then connected via the pole connector 7.8 to the positive pole P + of the ninth

Battery cell BZ9 connected and so on, until finally the pole connector 7.12 connects the positive pole P + of the first battery cell BZ 1. The negative pole P of the first battery cell BZ1 is then connected via the double-L-shaped pole connector 7.13 with the external terminal 4 of

Battery module 1 connected. This ends the second pass. By this skipping, the variation of the lengths of the pole connectors 7.1 -7.13 is reduced. The pole connector 7.7 is slightly shorter than the U-shaped pole connector 7.1 -7.6, 7.8-7.12. The length of the Polverbinders 7.13 is dependent on the distance of the negative pole P- of the battery cell BZ1 to the external terminal 4, which is usually low, especially in comparison to the very long pole connectors in Fig. 3 and 4.

Thus, the problems of the battery modules 1 according to FIG. 3 and FIG. 4 are avoided.

FIG. 2 shows an embodiment according to the invention for a 2 p connection. The poles of the battery cells BZ1-BZ12 are contacted by pole connectors 7.14-7.20 and connected to one another. The pole connectors 7.14-7.16 and 7.18-7.19 are comb-shaped, with tines Z of a comb-shaped pole connector contacting the poles, wherein the base B connects the tines Z, but is guided past the poles, so again as in Fig. 1 in the contacting in each case one pole is skipped. Again, the

Contacting by two passes. Via the pole connector 7.14, the two positive poles P + of the battery cells BZ2 and BZ4 are first connected to each other and to the external terminal 3. About the pole connector 7.15 then the two negative poles P are the

Battery cells BZ2 and BZ4 connected to each other and the positive poles P + of the battery cells BZ6 and BZ8 and terminated via the pole connector 7.16 the first pass. On the

rectangular pole connector 7.17 and the two pole connectors 7.18 and 7.19 is then finally contacted the positive pole P + of the two battery cells BZ1 and BZ3. On the

Polverbinder 7.20 is finally the negative terminal P- of the two battery cells BZ1 and BZ3 connected to the external terminal 4. In this case, the pole connector 7.20 is designed as a combined U-shaped and L-shaped pole connector 7.20.

The pattern of the arrangement of the poles in the first row R1 or the second row R2 is a modulo-8 pattern. In this case, the two outer poles of the first battery cell BZ1 and the eighth battery cell BZ8 each have the same polarity (for the first row R1 respectively), which then alternate inward (for BZ2 and BZ7, respectively, t), so that the two inner poles of the battery cells BZ4 and BZ5 have the same polarity (for the first row R1 each +).

Accordingly, the principle can also be extended to 3 p or 4 p interconnections.

Claims

claims

Battery module (1) comprising a number of n battery cells (BZ1-BZ12), each battery cell (BZ1 -BZ12) having a positive pole (P +) and a negative pole (P-), wherein the battery cells (BZ1-BZ12) arranged parallel to each other are such that first poles of all battery cells (BZ1-BZ12) along a first row (R1) are arranged and second poles of all battery cells (BZ1 -BZ12) along a second row (R2) are arranged, the polarities of the poles of the battery cells (BZ1 -BZ12) in a row (R1, R2) are different and alternate according to a predetermined pattern, wherein the poles of different battery cells (BZ1-BZ12) are interconnected by pole connectors (7, 7.1-7.20), the external terminals (3 , 4) for the positive pole and the negative pole of the battery module (1) to an end face (5) of the battery module (1) are led out, characterized in that

at least the pole connectors (7.2-7.5, 7.8-7.1 1; 7.15, 7.18, 7.19) which connect only the internal battery cells (BZ2 - BZ1 1) are U-shaped or comb-shaped, whereby the legs (S1, S2) of the U-shaped Polverbinder or tines (Z) of the comb-shaped pole connector is contacted a pole of a battery cell, wherein the distance of the legs (S1, S2) or prongs (Z) is selected such that at least one pole of an adjacent battery cell is skipped.

Battery module according to claim 1, characterized in that the number of

Battery cell (BZ1-BZ12) n = 12 or a multiple of 12 is.

Battery module according to claim 1 or 2, characterized in that the battery cells (BZ1-BZ12) are connected as a pure series circuit, wherein the pattern is a modulo-4 pattern, wherein the two outer poles of the four battery cells (BZ1-BZ4; BZ5- BZ8, BZ9-BZ12) in a row (R1, R2) have the same polarity and the two inner poles in the row (R1, R2) have the same polarity, the polarity of the outer and inner poles being different.

Battery module according to claim 3, characterized in that the inner pole connectors (7.2-7.5, 7.8-7.1 1) are U-shaped, wherein a pole connector (7.13) to an external terminal L- or double-L-shaped and a pole connector ( 7.7) at the external terminals (3, 4) opposite end face (6) is rectangular.

Battery module according to claim 1 or 2, characterized in that the battery cells (BZ1-BZ12) are connected as a 2 p series circuit, in each case two battery cells are connected in parallel, in which case the parallel circuits are connected in series, the pattern is a modulo 8 pattern, wherein the two outer battery cells in a row of the modulo-8 pattern have the same polarity, with the polarity alternating inward so that the two innermost battery cells in a row (R1, R2) have the same polarity.

Battery module according to claim 5, characterized in that the inner pole connectors (7.15, 7.18, 7.19) are comb-shaped, wherein a pole connector to an external terminal (4) as a combined U-shaped and L- or double-L-shaped pole connector (7.20 ) and a pole connector (7.17) on the external terminals (3, 4) opposite end faces (6) is rectangular in shape.